:root{--red:#E63946;--navy:#1D3557;--sky:#457B9D;--gold:#FFB703;--green:#2DC653;--purple:#7B2FBE;--bg:#F8F6F0;--text:#1a1a2e;--muted:#6b7280;--border:#e5e7eb;}
*{box-sizing:border-box;margin:0;padding:0;}
body{font-family:'Nunito',sans-serif;background:var(--bg);color:var(--text);min-height:100vh;overflow-x:hidden;}
header{background:var(--navy);padding:0 2rem;display:flex;align-items:center;justify-content:space-between;height:70px;position:sticky;top:0;z-index:100;box-shadow:0 4px 20px rgba(0,0,0,.25);}
.logo{display:flex;align-items:center;gap:12px;text-decoration:none;}
.logo-icon{width:42px;height:42px;background:var(--red);border-radius:12px;display:flex;align-items:center;justify-content:center;font-family:'Space Mono',monospace;font-weight:700;color:#fff;font-size:1.1rem;transform:rotate(-3deg);box-shadow:3px 3px 0 var(--gold);}
.logo-wordmark{display:flex;flex-direction:column;justify-content:center;gap:1px;line-height:1.05;}
.logo-text{color:#fff;font-size:1.35rem;font-weight:900;letter-spacing:0;}
.logo-domain{color:rgba(255,255,255,.72);font-family:'Space Mono',monospace;font-size:.64rem;font-weight:700;letter-spacing:.08em;text-transform:lowercase;}
.logo-text span{color:var(--gold);}
.hbadge{background:rgba(255,255,255,.1);border:1px solid rgba(255,255,255,.2);color:#fff;padding:6px 14px;border-radius:20px;font-size:.8rem;font-weight:700;}
nav{background:#fff;border-bottom:3px solid var(--border);display:flex;overflow-x:auto;scrollbar-width:none;padding:0 1rem;}
nav::-webkit-scrollbar{display:none;}
.tab-btn{padding:16px 22px;border:none;background:none;font-family:'Nunito',sans-serif;font-size:.95rem;font-weight:700;color:var(--muted);cursor:pointer;white-space:nowrap;border-bottom:3px solid transparent;margin-bottom:-3px;transition:color .2s ease,border-color .2s ease;display:flex;align-items:center;gap:7px;}
.tab-btn:hover{color:var(--navy);}
.tab-btn.active{color:var(--red);border-bottom-color:var(--red);}
.tab-btn.tab-locked{color:#94a3b8;position:relative;}
.tab-btn.tab-locked::after{
  content:'';
  width:14px;
  height:11px;
  border-radius:3px;
  background:#FFB703;
  box-shadow:inset 0 -2px 0 rgba(0,0,0,.12);
}
.tab-btn.tab-locked::before{
  content:'';
  position:absolute;
  right:10px;
  top:9px;
  width:8px;
  height:8px;
  border:3px solid #94a3b8;
  border-bottom:0;
  border-radius:8px 8px 0 0;
  animation:lockWiggle 1.8s ease-in-out infinite;
}
.panel{
  display:none;
  padding:2rem;
  max-width:1100px;
  margin:0 auto;
  animation:fadeIn .32s cubic-bezier(.22,.68,0,1.2) both;
  will-change:transform,opacity;
}
.panel.active{display:block;}
.panel.graph-page{max-width:1450px;}
.tool-tab-link{border-color:#bfdbfe;background:#eff6ff;color:#1D3557;}
@keyframes fadeIn{
  from{opacity:0;transform:translateY(12px) scale(0.99);}
  to{opacity:1;transform:translateY(0) scale(1);}
}

/* HOME */
.hero{background:linear-gradient(135deg,var(--navy),#2a4a7f);border-radius:24px;padding:3rem;color:#fff;position:relative;overflow:hidden;margin-bottom:2rem;}
.hero::before{content:'';position:absolute;top:-60px;right:-60px;width:300px;height:300px;background:rgba(255,183,3,.12);border-radius:50%;}
.hero::after{content:'';position:absolute;bottom:-40px;left:-40px;width:200px;height:200px;background:rgba(230,57,70,.15);border-radius:50%;}
.hero-content{position:relative;z-index:1;}
.hero h1{font-size:2.4rem;font-weight:900;line-height:1.2;margin-bottom:1rem;}
.hero h1 em{color:var(--gold);font-style:normal;}
.hero p{font-size:1.1rem;opacity:.85;max-width:500px;line-height:1.6;margin-bottom:1.5rem;}
.hero-btns{display:flex;gap:12px;flex-wrap:wrap;}
.hbtn{padding:12px 24px;border-radius:12px;font-weight:800;font-size:1rem;border:none;cursor:pointer;transition:transform .2s ease,box-shadow .2s ease,background .2s ease;}
.hbtn.p{background:var(--red);color:#fff;box-shadow:0 4px 15px rgba(230,57,70,.4);}
.hbtn.p:hover{transform:translateY(-2px);}
.hbtn.o{background:rgba(255,255,255,.15);color:#fff;border:2px solid rgba(255,255,255,.3);}
.hbtn.o:hover{background:rgba(255,255,255,.25);}
.cards-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:1.2rem;margin-bottom:2rem;}
.card{background:#fff;border-radius:18px;padding:1.5rem;border:2px solid var(--border);transition:transform .25s ease,box-shadow .25s ease,border-color .25s ease;cursor:pointer;position:relative;overflow:hidden;}
.card:hover{transform:translateY(-4px);box-shadow:0 12px 30px rgba(0,0,0,.1);border-color:var(--red);}
.card-emoji{font-size:2.2rem;margin-bottom:.8rem;display:block;}
.card h3{font-size:1.1rem;font-weight:800;margin-bottom:.4rem;color:var(--navy);}
.card p{font-size:.87rem;color:var(--muted);line-height:1.5;}
.cbadge{position:absolute;top:14px;right:14px;background:var(--gold);color:var(--navy);font-size:.7rem;font-weight:800;padding:3px 8px;border-radius:8px;text-transform:uppercase;}
.card.locked-card{
  cursor:not-allowed;
  border-color:#eadcf0;
  background:
    linear-gradient(135deg,rgba(255,255,255,.9),rgba(255,247,237,.82)),
    repeating-linear-gradient(-45deg,rgba(29,53,87,.035) 0 10px,transparent 10px 22px);
  filter:saturate(.88);
}
.card.locked-card:hover{
  transform:none;
  box-shadow:0 10px 26px rgba(29,53,87,.08);
  border-color:#d8b4e2;
}
.card.locked-card.lock-attention{
  animation:lockedAttention .62s ease;
}
.card.locked-card::before{
  content:'';
  position:absolute;
  inset:0;
  background:linear-gradient(110deg,transparent 0 34%,rgba(255,255,255,.62) 44%,transparent 56%);
  transform:translateX(-120%);
  animation:lockedScan 2.8s ease-in-out infinite;
  pointer-events:none;
}
.card.locked-card::after{
  content:'';
  position:absolute;
  inset:0;
  border-radius:18px;
  box-shadow:inset 0 0 0 1px rgba(123,47,190,.08);
  pointer-events:none;
}
.locked-card .card-emoji{
  width:54px;
  height:54px;
  border-radius:18px;
  display:grid;
  place-items:center;
  background:#fff;
  box-shadow:0 8px 20px rgba(29,53,87,.12);
}
.lock-plate{
  position:absolute;
  top:14px;
  right:14px;
  display:flex;
  align-items:center;
  gap:7px;
  padding:7px 10px;
  border-radius:999px;
  background:#1D3557;
  color:#fff;
  font-size:.72rem;
  font-weight:900;
  letter-spacing:.02em;
  box-shadow:0 8px 18px rgba(29,53,87,.2);
  z-index:2;
}
.lock-icon{
  position:relative;
  width:20px;
  height:16px;
  border-radius:5px;
  background:#FFB703;
  box-shadow:inset 0 -2px 0 rgba(0,0,0,.14);
}
.lock-icon::before{
  content:'';
  position:absolute;
  left:4px;
  top:-11px;
  width:12px;
  height:13px;
  border:4px solid #1D3557;
  border-bottom:0;
  border-radius:12px 12px 0 0;
  transform-origin:11px 13px;
  animation:lockWiggle 1.8s ease-in-out infinite;
}
.lock-icon::after{
  content:'';
  position:absolute;
  left:8px;
  top:5px;
  width:4px;
  height:6px;
  border-radius:4px;
  background:#1D3557;
}
.locked-note{
  display:inline-flex;
  align-items:center;
  gap:6px;
  margin-top:1rem;
  padding:7px 10px;
  border-radius:999px;
  background:#fff7ed;
  color:#9a3412;
  font-size:.76rem;
  font-weight:900;
}
@keyframes lockedScan{
  0%,45%{transform:translateX(-120%);}
  78%,100%{transform:translateX(120%);}
}
@keyframes lockWiggle{
  0%,66%,100%{transform:rotate(0);}
  76%{transform:rotate(-13deg);}
  86%{transform:rotate(9deg);}
}
@keyframes lockedAttention{
  0%,100%{transform:translateY(0) scale(1);}
  35%{transform:translateY(-4px) scale(1.015);}
  65%{transform:translateY(0) scale(.995);}
}
.maarif{display:inline-flex;align-items:center;gap:6px;background:#fff3cd;border:1.5px solid #ffc107;color:#856404;padding:5px 12px;border-radius:10px;font-size:.78rem;font-weight:800;margin-bottom:1rem;}



/* ── ÜCRETSİZ BANNER ── */
.free-banner{
  background:linear-gradient(90deg,#064e3b,#065f46 50%,#064e3b);
  color:#fff;
  border-bottom:2px solid #10b981;
  overflow:hidden;
  max-height:120px;
  transition:max-height .4s ease, opacity .3s ease, border-color .3s ease;
  opacity:1;
}
.free-banner.banner-hidden{
  max-height:0;
  opacity:0;
  border-bottom-color:transparent;
  pointer-events:none;
}
.free-banner-close{
  background:#dc2626;
  border:none;
  color:#fff;
  font:700 11px 'Nunito',sans-serif;
  cursor:pointer;
  padding:4px 10px;
  border-radius:6px;
  line-height:1;
  flex-shrink:0;
  display:flex;
  align-items:center;
  gap:4px;
  transition:background .15s ease, transform .15s ease;
}
.free-banner-close:hover{
  background:#b91c1c;
  transform:scale(1.05);
}

/* ── Banner Promo Köşesi ── */
.banner-promo{
  margin-left:auto;
  display:flex;
  align-items:center;
  gap:8px;
  flex-shrink:0;
}
.banner-promo-sep{
  width:1px;
  height:22px;
  background:rgba(255,255,255,.2);
  flex-shrink:0;
}
.banner-promo-label{
  font:700 9px 'Space Mono',monospace;
  color:rgba(255,255,255,.4);
  text-transform:uppercase;
  letter-spacing:1px;
  white-space:nowrap;
}
.banner-promo-card{
  display:flex;
  align-items:center;
  gap:6px;
  background:rgba(255,255,255,.1);
  border:1px solid rgba(255,255,255,.2);
  border-radius:8px;
  padding:4px 10px;
  cursor:pointer;
  text-decoration:none;
  transition:background .15s ease, transform .15s ease;
  white-space:nowrap;
}
.banner-promo-card:hover{
  background:rgba(255,255,255,.2);
  transform:translateY(-1px);
}
.banner-promo-new{
  background:var(--gold);
  color:var(--navy);
  font:900 9px 'Space Mono',monospace;
  padding:1px 5px;
  border-radius:4px;
  letter-spacing:.5px;
}
.banner-promo-text{
  color:#fff;
  font:700 11px 'Nunito',sans-serif;
}
@media(max-width:700px){
  .banner-promo-label{display:none;}
  .banner-promo-sep{display:none;}
}
@media(max-width:500px){
  .banner-promo{display:none;}
}
.free-banner-inner{
  max-width:1100px;
  margin:0 auto;
  padding:9px 1.2rem;
  display:flex;
  align-items:center;
  justify-content:flex-start;
  gap:12px;
  flex-wrap:nowrap;
}
.free-banner-badge{
  background:#10b981;
  color:#fff;
  font:900 11px 'Space Mono',monospace;
  padding:3px 10px;
  border-radius:20px;
  letter-spacing:1.5px;
  text-transform:uppercase;
  white-space:nowrap;
  flex-shrink:0;
}
.free-banner-text{
  font:800 13px 'Nunito',sans-serif;
  color:#d1fae5;
  display:flex;
  align-items:center;
  gap:10px;
  flex-wrap:wrap;
  justify-content:center;
  text-align:center;
}
.free-banner-text strong{color:#fff;font-size:14px;}
.free-banner-divider{color:#6ee7b7;opacity:.6;font-size:12px;}
.free-banner-icons{display:flex;gap:6px;flex-shrink:0;}
.free-banner-icon{
  background:rgba(255,255,255,.12);
  border:1px solid rgba(255,255,255,.2);
  border-radius:8px;
  padding:2px 8px;
  font-size:11px;
  font-weight:800;
  color:#ecfdf5;
  white-space:nowrap;
}
@media(max-width:600px){
  .free-banner-inner{flex-wrap:wrap;gap:8px;padding:8px 1rem;}
  .free-banner-icons{display:none;}
  .free-banner-text{font-size:11px;}
  .free-banner-close{margin-left:0;}
}

.section-title{font-size:1.6rem;font-weight:900;color:var(--navy);margin-bottom:.3rem;}

/* ── Formül Dene Kartı ── */
.card-formula-promo{
  background:linear-gradient(135deg,#1D3557 0%,#2a4a7f 60%,#457B9D 100%);
  border:2px solid #457B9D !important;
  position:relative;
  overflow:hidden;
  color:#fff;
}
.card-formula-promo::before{
  content:'';
  position:absolute;
  top:-30px;right:-30px;
  width:100px;height:100px;
  background:rgba(255,183,3,.15);
  border-radius:50%;
}
.card-formula-promo h3{color:#fff !important;}
.card-formula-promo p{color:rgba(255,255,255,.8) !important;}
.card-formula-promo .cfp-chips{
  display:flex;gap:5px;flex-wrap:wrap;margin-top:8px;
}
.card-formula-promo .cfp-chip{
  background:rgba(255,255,255,.18);
  border:1px solid rgba(255,255,255,.25);
  color:#fff;
  font:700 10px 'Nunito',sans-serif;
  padding:2px 8px;border-radius:10px;
}
.card-formula-promo .cbadge{
  background:var(--gold) !important;
  color:var(--navy) !important;
}
.cfp-btn{
  margin-top:10px;
  display:inline-flex;align-items:center;gap:5px;
  background:var(--gold);color:var(--navy);
  font:800 11px 'Nunito',sans-serif;
  padding:5px 14px;border-radius:20px;
  border:none;cursor:pointer;
  transition:transform .15s ease,box-shadow .15s ease;
}
.cfp-btn:hover{transform:translateY(-1px);box-shadow:0 4px 12px rgba(255,183,3,.5);}

/* ── Araçlar Tooltip ── */
.tools-tooltip{
  position:absolute;
  bottom:calc(100% + 10px);
  left:50%;
  transform:translateX(-50%);
  background:#1D3557;
  color:#fff;
  font:700 11px 'Nunito',sans-serif;
  padding:7px 12px;
  border-radius:10px;
  white-space:nowrap;
  box-shadow:0 4px 16px rgba(0,0,0,.25);
  pointer-events:none;
  opacity:0;
  transition:opacity .3s ease, transform .3s ease;
  transform:translateX(-50%) translateY(4px);
  z-index:200;
}
.tools-tooltip::after{
  content:'';
  position:absolute;
  top:100%;left:50%;
  transform:translateX(-50%);
  border:6px solid transparent;
  border-top-color:#1D3557;
}
.tools-tooltip.tt-visible{
  opacity:1;
  transform:translateX(-50%) translateY(0);
}
.tt-tab-wrap{
  position:relative;
  display:inline-block;
}
.section-sub{color:var(--muted);font-size:.95rem;margin-bottom:1.5rem;}
.lesson-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:1rem;}
.lesson-card{background:#fff;border-radius:16px;border:2px solid var(--border);overflow:hidden;transition:transform .2s ease,box-shadow .2s ease;}
.lesson-card:hover{transform:translateY(-3px);box-shadow:0 10px 25px rgba(0,0,0,.09);}
.lesson-head{padding:1.2rem 1.4rem;display:flex;align-items:center;gap:12px;}
.lesson-icon{width:44px;height:44px;border-radius:12px;display:flex;align-items:center;justify-content:center;font-size:1.4rem;flex-shrink:0;}
.lesson-title{font-weight:800;font-size:1rem;color:var(--navy);}
.lesson-sub{font-size:.8rem;color:var(--muted);margin-top:2px;}
.lesson-topics{padding:0 1.4rem 1.2rem;display:flex;flex-wrap:wrap;gap:6px;}
/* GRADE SELECTOR for Lessons */
.grade-filter{display:flex;gap:8px;margin-bottom:1.5rem;flex-wrap:wrap;}
.gf-btn{padding:8px 20px;border:2px solid var(--border);border-radius:50px;background:#fff;font-weight:800;font-size:.9rem;cursor:pointer;transition:transform .2s ease,background .2s ease,color .2s ease,border-color .2s ease;color:var(--muted);}
.gf-btn:hover{border-color:var(--navy);color:var(--navy);}
.gf-btn.active{color:#fff;border-color:transparent;transform:scale(1.05);}
.gf-btn[data-g="5"].active{background:#2DC653;}
.gf-btn[data-g="6"].active{background:#FFB703;color:#1D3557;}
.gf-btn[data-g="7"].active{background:#7B2FBE;}
.gf-btn[data-g="8"].active{background:#E63946;}

/* ── Animasyon Kutuları ── */
.nb-anim-wrap{
  margin:1rem 0;
  border-radius:18px;
  overflow:hidden;
  border:1.5px solid #dbe4ef;
  border-color:color-mix(in srgb,var(--anim-color,#457B9D) 26%,#dbe4ef);
  background:linear-gradient(180deg,#fff,#f8fbff);
  box-shadow:0 14px 35px rgba(29,53,87,.12);
  position:relative;
}
.nb-anim-wrap::before{
  content:'';
  position:absolute;
  inset:0;
  pointer-events:none;
  background:
    radial-gradient(circle at 18% 12%,rgba(69,123,157,.12),transparent 28%),
    radial-gradient(circle at 18% 12%,color-mix(in srgb,var(--anim-color,#457B9D) 18%,transparent),transparent 28%),
    linear-gradient(135deg,rgba(255,255,255,.34),transparent 42%);
  opacity:.75;
}
.nb-anim-head{
  position:relative;
  z-index:1;
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:10px;
  padding:10px 12px;
  background:linear-gradient(135deg,var(--anim-color,#457B9D),#1D3557);
  background:linear-gradient(135deg,color-mix(in srgb,var(--anim-color,#457B9D) 92%,#1D3557),#1D3557);
  color:#fff;
}
.nb-anim-title{
  display:flex;
  align-items:center;
  gap:8px;
  font:900 .86rem 'Nunito',sans-serif;
  letter-spacing:.01em;
}
.nb-anim-dot{
  width:12px;
  height:12px;
  border-radius:50%;
  background:#FFB703;
  box-shadow:0 0 0 4px rgba(255,255,255,.18);
}
.nb-anim-stage{
  position:relative;
  z-index:1;
  padding:6px;
  overflow:hidden;
  background:
    linear-gradient(rgba(69,123,157,.08) 1px,transparent 1px),
    linear-gradient(90deg,rgba(69,123,157,.08) 1px,transparent 1px),
    #f8fbff;
  background-size:28px 28px;
}
.nb-canvas{
  box-sizing:border-box;
  display:block;
  width:100%;
  height:260px;
  cursor:crosshair;
  touch-action:none;
  background:linear-gradient(180deg,#fff,#f7fbff);
  border:1.5px solid #dbe7f5;
  border-radius:12px;
  box-shadow:inset 0 1px 0 rgba(255,255,255,.9),0 6px 14px rgba(29,53,87,.06);
}
.nb-anim-tabs{
  display:flex;gap:0;
  border:1px solid #dbe7f5;
  border-radius:14px;
  overflow:hidden;
  background:#eef5fb;
  margin:10px;
}
.nb-atab{
  flex:1;padding:9px 8px;font-size:.8rem;font-weight:900;
  border:none;background:transparent;cursor:pointer;color:#64748b;
  transition:color .15s ease,background .15s ease,box-shadow .15s ease;border-bottom:0;
  font-family:'Nunito',sans-serif;
}
.nb-atab.on{background:#fff;color:#1D3557;box-shadow:0 5px 14px rgba(29,53,87,.1);}
.nb-anim-label{
  position:relative;
  z-index:1;
  text-align:center;
  padding:10px 14px 12px;
  font-size:.82rem;
  font-weight:900;
  color:#42526b;
  line-height:1.35;
  font-family:'Nunito',sans-serif;
  background:#fff;
  border-top:1px solid #e5edf6;
}
@media(max-width:620px){
  .nb-anim-head{align-items:flex-start;flex-direction:column}
  .nb-anim-stage{padding:6px}
  .nb-canvas{height:240px}
}

/* Area filter bar */
.area-filter{display:flex;gap:6px;margin-bottom:1.2rem;flex-wrap:wrap;}
.af-btn{padding:5px 14px;border:1.5px solid var(--border);border-radius:50px;background:#fff;font-weight:700;font-size:.8rem;cursor:pointer;transition:background .18s ease,color .18s ease,border-color .18s ease;color:var(--muted);}
.af-btn:hover{border-color:var(--navy);color:var(--navy);}
.af-btn.active{background:var(--navy);color:#fff;border-color:var(--navy);}
/* Topic cards grid */
.topic-cards{display:grid;grid-template-columns:repeat(auto-fill,minmax(200px,1fr));gap:.9rem;}
.topic-card{background:#fff;border-radius:16px;border:2px solid var(--border);padding:1rem 1.1rem;cursor:pointer;transition:transform .2s ease,box-shadow .2s ease;display:flex;flex-direction:column;gap:6px;position:relative;overflow:hidden;}
.topic-card::before{content:'';position:absolute;top:0;left:0;right:0;height:4px;}
.topic-card[data-g="5"]::before{background:#2DC653;}
.topic-card[data-g="6"]::before{background:#FFB703;}
.topic-card[data-g="7"]::before{background:#7B2FBE;}
.topic-card[data-g="8"]::before{background:#E63946;}
.topic-card:hover{transform:translateY(-3px);box-shadow:0 8px 24px rgba(0,0,0,.1);}
.topic-card:hover .tc-title{color:var(--red);}
.tc-area{font-size:.7rem;font-weight:800;text-transform:uppercase;letter-spacing:.6px;color:var(--muted);}
.tc-title{font-size:.95rem;font-weight:800;color:var(--navy);line-height:1.3;}
.tc-kaz{font-size:.72rem;color:var(--purple);font-family:'Space Mono',monospace;margin-top:2px;}
.tc-arrow{position:absolute;bottom:.8rem;right:.8rem;font-size:.85rem;color:var(--muted);transition:transform .2s;}
.topic-card:hover .tc-arrow{transform:translateX(3px);color:var(--red);}
.area-section{margin-bottom:1.5rem;}
.area-header{display:flex;align-items:center;gap:8px;margin-bottom:.8rem;padding-bottom:.5rem;border-bottom:2px solid var(--border);}
.area-icon{width:36px;height:36px;border-radius:10px;display:flex;align-items:center;justify-content:center;font-size:1.2rem;}
.area-name{font-weight:900;font-size:1rem;color:var(--navy);}
.topic-tag{background:var(--bg);border:1.5px solid var(--border);color:var(--navy);font-size:.78rem;font-weight:700;padding:4px 10px;border-radius:8px;cursor:pointer;transition:transform .15s ease,background .15s ease,color .15s ease,border-color .15s ease;}
.topic-tag:hover{background:var(--navy);color:#fff;border-color:var(--navy);transform:translateY(-1px);}
/* MODAL */
/* ══════════ DEFTER / NOTEBOOK MODAL ══════════ */
.modal-overlay{position:fixed;inset:0;background:rgba(15,23,42,.55);z-index:1000;display:flex;align-items:center;justify-content:center;padding:1rem;opacity:0;pointer-events:none;transition:opacity .25s ease;will-change:opacity;}
.modal-overlay.open{opacity:1;pointer-events:all;}

/* Ana kutu — spiral deftere benzetildi */
.modal-box{
  background:#fefce8;
  border-radius:4px 16px 16px 4px;
  max-width:660px;width:100%;max-height:88vh;overflow-y:auto;
  -webkit-overflow-scrolling:touch;
  scroll-behavior:smooth;
  overscroll-behavior:contain;
  box-shadow:0 20px 60px rgba(0,0,0,.3),4px 0 0 #e5e7eb inset,-4px 0 0 #e5e7eb inset;
  transform:translateY(16px) rotate(-0.5deg) scale(0.98);
  transition:transform .28s cubic-bezier(.2,.8,.4,1),border-radius .28s ease,box-shadow .28s ease;
  position:relative;
  will-change:transform;
  contain:layout style;
}
.modal-overlay.open .modal-box{transform:translateY(0) rotate(0deg) scale(1);}
.modal-box.topic-fullscreen-animating{
  overflow:hidden;
  transform-origin:top left;
}
.modal-box.topic-fullscreen{
  max-width:none;
  width:100vw;
  max-height:100vh;
  height:100vh;
  border-radius:0;
  transform:none;
  box-shadow:none;
}
.modal-box.topic-fullscreen .nb-head{border-radius:0;}
.modal-box.topic-fullscreen .nb-body{
  min-height:calc(100vh - 110px);
  padding-right:clamp(1.2rem,4vw,4rem);
}
.modal-box.topic-fullscreen .nb-section{
  max-width:1280px;
  margin-left:auto;
  margin-right:auto;
}
.modal-box.topic-fullscreen .nb-anim-wrap{
  max-width:1180px;
  margin-left:auto;
  margin-right:auto;
}

/* Sol spiral delik efekti */
.modal-box::before{
  content:'';position:sticky;top:0;left:0;width:52px;
  height:100%;float:left;
  background:#fff8e1;
  border-right:3px solid #e2c97e;
  z-index:1;
  pointer-events:none;
  will-change:auto;
}
/* Delik noktaları */
.modal-box::after{
  content:'';position:absolute;top:20px;left:16px;bottom:20px;width:20px;
  background:repeating-linear-gradient(transparent,transparent 46px,rgba(0,0,0,.08) 46px,rgba(0,0,0,.08) 50px,transparent 50px,transparent 58px,#c8d4e8 58px,#c8d4e8 70px,transparent 70px);
  border-radius:10px;
  z-index:2;
}

/* Başlık şeridi */
.nb-head{
  position:sticky;top:0;z-index:10;
  will-change:transform;
  transform:translate3d(0,0,0);
  backface-visibility:hidden;
  padding:1rem 1.2rem .8rem 60px;
  background:var(--head-color,#1D3557);
  border-radius:0 16px 0 0;
  box-shadow:0 2px 8px rgba(0,0,0,.2);
}
.nb-grade-pill{display:inline-flex;align-items:center;gap:5px;background:rgba(255,255,255,.25);color:#fff;padding:2px 10px;border-radius:20px;font-size:.72rem;font-weight:800;letter-spacing:.5px;margin-bottom:.35rem;}
.nb-title{font-size:1.25rem;font-weight:900;color:#fff;line-height:1.25;text-shadow:0 1px 3px rgba(0,0,0,.3);}
.nb-kaz{font-size:.72rem;color:rgba(255,255,255,.7);font-family:'Space Mono',monospace;margin-top:.25rem;}
.nb-close,.nb-fullscreen{position:absolute;top:.8rem;width:30px;height:30px;border:none;background:rgba(255,255,255,.2);border-radius:50%;font-size:1rem;cursor:pointer;color:#fff;display:flex;align-items:center;justify-content:center;transition:background .15s,transform .15s;font-weight:900;}
.nb-close{right:.8rem;}
.nb-fullscreen{right:3rem;font-size:.72rem;letter-spacing:-1px;}
.nb-close:hover,.nb-fullscreen:hover{background:rgba(255,255,255,.4);transform:translateY(-1px);}
.modal-box.topic-fullscreen .nb-fullscreen{background:rgba(255,255,255,.34);}

/* İçerik alanı */
.nb-body{
  padding:1.2rem 1.4rem 2rem 64px;position:relative;z-index:5;
  /* Çizgiler nb-body içinde statik — scroll'da GPU da kalır */
  background-image:repeating-linear-gradient(transparent,transparent 27px,#dde3ec 27px,#dde3ec 28px);
  background-attachment:scroll;
}

/* ── Bölüm Başlığı ── */
.nb-section{margin-bottom:1.4rem;}
.nb-section-title{
  font-size:.72rem;font-weight:900;text-transform:uppercase;letter-spacing:1.2px;
  color:#fff;padding:4px 12px;border-radius:4px;
  display:inline-flex;align-items:center;gap:6px;
  margin-bottom:.75rem;box-shadow:1px 2px 4px rgba(0,0,0,.2);
}

/* ── Tanım Kutusu ── */
.nb-def{
  background:#fff;border-left:4px solid var(--nb-color,#457B9D);
  padding:.7rem 1rem;border-radius:0 8px 8px 0;
  font-size:.92rem;line-height:1.65;color:#1e293b;
  box-shadow:2px 2px 6px rgba(0,0,0,.06);
  margin-bottom:.6rem;
}
.nb-def strong{color:var(--nb-color,#457B9D);}

/* ── Formül Kutusu (highlight marker efekti) ── */
.nb-formula{
  background:linear-gradient(180deg,transparent 60%,#fef08a 60%);
  padding:.5rem .8rem;
  font-family:'Space Mono',monospace;font-size:.9rem;
  color:#1e1b4b;font-weight:700;line-height:1.9;
  margin-bottom:.5rem;display:block;
}
.nb-formula-box{
  background:#fff;border:2px solid #a78bfa;border-radius:10px;
  padding:.85rem 1rem;
  font-family:'Space Mono',monospace;font-size:.88rem;color:#4c1d95;
  line-height:1.9;box-shadow:inset 0 1px 4px rgba(124,58,237,.1);
  margin-bottom:.6rem;
}

/* ── Kural Listesi ── */
.nb-rules{display:flex;flex-direction:column;gap:.45rem;margin-bottom:.6rem;}
.nb-rule{
  display:flex;align-items:flex-start;gap:.6rem;
  background:#fff;border-radius:8px;padding:.55rem .8rem;
  font-size:.91rem;line-height:1.55;color:#1e293b;
  border:1px solid #e2e8f0;box-shadow:0 1px 3px rgba(0,0,0,.05);
}
.nb-rule-dot{
  width:22px;height:22px;border-radius:50%;flex-shrink:0;
  display:flex;align-items:center;justify-content:center;
  font-size:.7rem;font-weight:900;color:#fff;margin-top:1px;
}

/* ── Tam Kare Tablosu ── */
.nb-table{width:100%;border-collapse:collapse;margin-bottom:.6rem;background:#fff;border-radius:8px;overflow:hidden;box-shadow:0 1px 4px rgba(0,0,0,.08);}
.nb-table th{background:var(--nb-color,#457B9D);color:#fff;padding:6px 10px;font-size:.8rem;text-align:center;}
.nb-table td{padding:5px 10px;font-size:.85rem;text-align:center;border-bottom:1px solid #f1f5f9;font-family:'Space Mono',monospace;}
.nb-table tr:last-child td{border-bottom:none;}
.nb-table tr:nth-child(even) td{background:#f8fafc;}

/* ── Örnek Çözüm ── */
.nb-example{
  background:linear-gradient(135deg,#eff6ff 0%,#f0fdf4 100%);
  border:1.5px solid #93c5fd;border-radius:10px;
  padding:.85rem 1rem;margin-bottom:.6rem;
}
.nb-ex-label{
  font-size:.7rem;font-weight:900;text-transform:uppercase;letter-spacing:1px;
  color:#1d4ed8;margin-bottom:.5rem;display:flex;align-items:center;gap:5px;
}
.nb-ex-label::before{content:'✏️';font-size:.85rem;}
.nb-ex-content{font-size:.9rem;color:#1e3a5f;line-height:1.75;font-weight:600;}
.nb-ex-steps{display:flex;flex-direction:column;gap:.3rem;margin-top:.5rem;}
.nb-ex-step{display:flex;align-items:flex-start;gap:.5rem;font-size:.87rem;color:#1e3a5f;}
.nb-ex-step-num{
  background:#1d4ed8;color:#fff;width:20px;height:20px;border-radius:50%;
  display:flex;align-items:center;justify-content:center;font-size:.65rem;font-weight:900;flex-shrink:0;margin-top:2px;
}

/* ── Dikkat Kutusu (sarı sticky note) ── */
.nb-warn{
  background:#fef9c3;border-left:4px solid #eab308;
  border-radius:0 8px 8px 0;padding:.7rem 1rem;
  font-size:.9rem;line-height:1.6;color:#713f12;
  box-shadow:2px 3px 8px rgba(234,179,8,.2);margin-bottom:.6rem;
}
.nb-warn::before{content:'⚠️  ';font-size:.85rem;}

/* ── Kırmızı Hata Kutusu ── */
.nb-error{
  background:#fef2f2;border:2px dashed #f87171;
  border-radius:8px;padding:.7rem 1rem;
  font-size:.9rem;line-height:1.6;color:#7f1d1d;margin-bottom:.6rem;
}
.nb-error::before{content:'🚫  ';}

/* ── Yeşil ipucu ── */
.nb-tip{
  background:#f0fdf4;border-left:4px solid #22c55e;
  border-radius:0 8px 8px 0;padding:.7rem 1rem;
  font-size:.9rem;line-height:1.6;color:#14532d;margin-bottom:.6rem;
}

/* Grade 5 topic passport: attention layer before the notebook notes */
.nb-passport{
  background:linear-gradient(135deg,#ffffff 0%,#f0fdf4 52%,#ecfeff 100%);
  border:2px solid color-mix(in srgb,var(--nb-color,#2DC653) 38%,#ffffff);
  border-radius:16px;
  padding:1rem;
  margin-bottom:1rem;
  box-shadow:0 8px 22px rgba(15,23,42,.1);
  position:relative;
  overflow:hidden;
}
.nb-passport::after{
  content:'';
  position:absolute;
  right:-38px;top:-42px;
  width:130px;height:130px;
  border-radius:50%;
  background:color-mix(in srgb,var(--nb-color,#2DC653) 16%,transparent);
}
.nb-passport-top{display:flex;gap:.85rem;align-items:center;position:relative;z-index:1;margin-bottom:.85rem;}
.nb-passport-icon{
  width:56px;height:56px;border-radius:18px;
  display:flex;align-items:center;justify-content:center;
  background:var(--nb-color,#2DC653);
  color:#fff;font-size:1.8rem;box-shadow:0 6px 0 rgba(0,0,0,.12);
  flex-shrink:0;
}
.nb-passport-kicker{
  font-size:.68rem;font-weight:900;letter-spacing:1.3px;text-transform:uppercase;
  color:var(--nb-color,#2DC653);margin-bottom:.2rem;
}
.nb-passport-hook{font-size:1rem;font-weight:900;line-height:1.35;color:#14324a;}
.nb-passport-grid{display:grid;grid-template-columns:1.2fr .8fr;gap:.75rem;position:relative;z-index:1;}
.nb-passport-card{
  background:rgba(255,255,255,.78);
  border:1px solid #dbeafe;
  border-radius:13px;
  padding:.75rem .85rem;
}
.nb-passport-card-title{
  font-size:.7rem;font-weight:900;text-transform:uppercase;letter-spacing:.9px;
  color:#64748b;margin-bottom:.55rem;
}
.nb-can-list{display:flex;flex-direction:column;gap:.42rem;}
.nb-can-list span{
  display:flex;align-items:flex-start;gap:.45rem;
  color:#1e293b;font-size:.88rem;font-weight:800;line-height:1.35;
}
.nb-can-list span::before{
  content:'✓';
  width:18px;height:18px;border-radius:50%;flex-shrink:0;
  display:flex;align-items:center;justify-content:center;
  background:var(--nb-color,#2DC653);color:#fff;font-size:.7rem;font-weight:900;margin-top:1px;
}
.nb-challenge{
  background:linear-gradient(135deg,#fff7ed,#fffbeb);
  border-color:#fed7aa;
}
.nb-challenge p{color:#7c2d12;font-size:.9rem;font-weight:900;line-height:1.45;margin:0;}
@media(max-width:620px){
  .nb-passport-grid{grid-template-columns:1fr;}
  .nb-passport-top{align-items:flex-start;}
  .nb-passport-icon{width:48px;height:48px;border-radius:15px;font-size:1.55rem;}
}

/* Grade 5 data chart lab */
.nb-chart-lab{background:#f8fafc;}
.nb-chart-panel{
  display:grid;
  grid-template-columns:repeat(auto-fit,minmax(104px,1fr));
  gap:.45rem;
  padding:.65rem;
  border-top:1px solid #e2e8f0;
  background:#fff;
}
.nb-chart-control{
  display:grid;
  grid-template-columns:28px 1fr 32px 28px;
  align-items:center;
  gap:.25rem;
  background:color-mix(in srgb,var(--bar,#3b82f6) 10%,#ffffff);
  border:1px solid color-mix(in srgb,var(--bar,#3b82f6) 35%,#ffffff);
  border-radius:10px;
  padding:.35rem;
}
.nb-chart-control button{
  width:28px;height:28px;border:none;border-radius:8px;
  background:var(--bar,#3b82f6);color:#fff;font-weight:900;cursor:pointer;
}
.nb-chart-control strong{font-size:.78rem;color:#1e293b;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;}
.nb-chart-control span{
  font-family:'Space Mono',monospace;font-weight:900;color:#0f172a;text-align:center;
}
.nb-chart-table{
  display:grid;
  grid-template-columns:repeat(auto-fit,minmax(94px,1fr));
  gap:.35rem;
  padding:.55rem .65rem .3rem;
  background:#fff;
}
.nb-chart-row{
  display:flex;align-items:center;gap:.35rem;
  border:1px solid #e2e8f0;border-radius:8px;
  padding:.3rem .45rem;font-size:.78rem;color:#475569;font-weight:800;
}
.nb-chart-row.on{background:#eff6ff;border-color:#93c5fd;color:#1d4ed8;}
.nb-chart-dot{width:9px;height:9px;border-radius:50%;flex-shrink:0;}
.nb-chart-row strong{margin-left:auto;font-family:'Space Mono',monospace;color:#0f172a;}
.nb-chart-insight{
  margin:.35rem .65rem .65rem;
  background:#ecfdf5;border:1px solid #86efac;border-radius:10px;
  padding:.55rem .7rem;color:#14532d;font-size:.86rem;font-weight:800;line-height:1.4;
}

/* Grade 5 v2 interactive labs */
.nb-g5-lab{
  background:linear-gradient(180deg,#fff,#f8fbff);
  border:1.5px solid #dbe7f5;
  border-radius:18px;
  overflow:hidden;
  box-shadow:0 12px 28px rgba(29,53,87,.1);
}
.nb-g5-head{
  padding:.65rem .85rem;
  background:linear-gradient(135deg,#1D3557,#457B9D);
  color:#fff;
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:.75rem;
  flex-wrap:wrap;
}
.nb-g5-head strong{font-size:.95rem;font-weight:900;}
.nb-g5-head span{font-size:.78rem;font-weight:800;color:rgba(255,255,255,.74);}
.nb-g5-canvas{
  display:block;
  width:100%;
  background:linear-gradient(180deg,#fff,#f8fbff);
  touch-action:none;
}
.nb-g5-controls{
  display:flex;
  gap:.5rem;
  flex-wrap:wrap;
  align-items:center;
  justify-content:center;
  padding:.65rem;
  background:#fff;
  border-top:1px solid #e2e8f0;
}
.nb-g5-controls button{
  border:none;
  border-radius:999px;
  background:linear-gradient(135deg,#1D3557,#457B9D);
  color:#fff;
  padding:.42rem .8rem;
  font:900 .8rem Nunito,sans-serif;
  cursor:pointer;
  box-shadow:0 4px 0 rgba(29,53,87,.18);
  transition:transform .15s ease,box-shadow .15s ease;
}
.nb-g5-controls button:hover{transform:translateY(-1px);}
.nb-g5-controls button:active{transform:translateY(2px);box-shadow:0 1px 0 rgba(29,53,87,.18);}
.nb-g5-slider{
  display:flex;
  align-items:center;
  gap:.55rem;
  min-width:min(100%,220px);
  background:#f1f5f9;
  border:1px solid #e2e8f0;
  border-radius:999px;
  padding:.38rem .65rem;
  color:#334155;
  font-size:.82rem;
  font-weight:900;
}
.nb-g5-slider input{flex:1;accent-color:#457B9D;}
.nb-g5-info{
  padding:.6rem .8rem;
  background:#ecfdf5;
  border-top:1px solid #bbf7d0;
  color:#14532d;
  font-size:.88rem;
  font-weight:800;
  line-height:1.45;
}

/* Grade 5 v3 robust widgets */
.g5v3{background:linear-gradient(180deg,#fff,#f8fbff);border:1.5px solid #dbe7f5;border-radius:18px;overflow:hidden;box-shadow:0 12px 28px rgba(29,53,87,.1);}
.g5v3-head{display:flex;align-items:center;justify-content:space-between;gap:.8rem;flex-wrap:wrap;background:linear-gradient(135deg,#1D3557,#457B9D);color:#fff;padding:.75rem .9rem;}
.g5v3-head strong{font-size:1rem;font-weight:900;}
.g5v3-head span{font-size:.8rem;font-weight:900;color:rgba(255,255,255,.75);}
.g5v3-body{padding:1rem;background:linear-gradient(180deg,#fff,#f8fbff);}
.g5v3-controls{display:flex;gap:.55rem;flex-wrap:wrap;align-items:center;justify-content:center;padding:.8rem;background:#fff;border-top:1px solid #e2e8f0;}
.g5v3-info{padding:.65rem .85rem;background:#ecfdf5;border-top:1px solid #bbf7d0;color:#14532d;font-size:.9rem;font-weight:900;line-height:1.45;}
.g5v3 button{border:none;border-radius:999px;background:linear-gradient(135deg,#1D3557,#457B9D);color:#fff;padding:.5rem .95rem;font:900 .82rem Nunito,sans-serif;cursor:pointer;box-shadow:0 4px 0 rgba(29,53,87,.16);transition:transform .15s ease,box-shadow .15s ease;}
.g5v3 button:hover{transform:translateY(-1px);}
.g5v3 button:active{transform:translateY(2px);box-shadow:0 1px 0 rgba(29,53,87,.16);}
.g5v3 button.alt{background:#e2e8f0;color:#1D3557;}
.g5v3 input[type=range]{accent-color:#457B9D;}
.g5-digit-row{display:flex;justify-content:center;gap:.45rem;flex-wrap:wrap;margin:.6rem 0;}
.g5-digit{width:64px;height:68px;border-radius:16px;border:2px solid #cbd5e1;background:#fff;color:#1D3557;font:900 1.8rem Nunito,sans-serif;display:grid;place-items:center;cursor:pointer;box-shadow:0 6px 0 rgba(29,53,87,.08);transition:transform .15s ease,border-color .15s ease;}
.g5-digit:hover{transform:translateY(-2px);border-color:#93c5fd;}
.g5-digit.on{background:#fee2e2;border-color:#ef4444;color:#ef4444;box-shadow:0 8px 18px rgba(239,68,68,.18);}
.g5-mini-label{font-size:.72rem;color:#64748b;text-align:center;font-weight:900;margin-top:.25rem;}
.g5-result{max-width:440px;margin:.75rem auto 0;background:#fff;border:1px solid #e2e8f0;border-radius:14px;padding:.8rem;text-align:center;color:#1D3557;font-weight:900;box-shadow:0 6px 16px rgba(29,53,87,.07);}
.g5-slider{display:flex;align-items:center;gap:.55rem;background:#f1f5f9;border:1px solid #e2e8f0;border-radius:999px;padding:.45rem .7rem;font-weight:900;color:#334155;}
.g5-slider input{min-width:130px;}
.g5-frac-stage{display:grid;grid-template-columns:160px 1fr;gap:1rem;align-items:center;max-width:560px;margin:0 auto;}
.g5-pie{width:150px;height:150px;border-radius:50%;border:4px solid #e2e8f0;background:conic-gradient(#3b82f6 0deg,#e2e8f0 0deg);display:grid;place-items:center;color:#1D3557;font:900 1.8rem Nunito,sans-serif;}
.g5-bar{height:34px;border-radius:999px;background:#e2e8f0;overflow:hidden;border:1px solid #cbd5e1;}
.g5-bar-fill{height:100%;background:linear-gradient(90deg,#22c55e,#2dd4bf);width:0%;transition:width .25s ease;}
.g5-pattern-row{display:flex;gap:.5rem;justify-content:center;flex-wrap:wrap;margin:.7rem 0;}
.g5-term{width:62px;height:54px;border-radius:14px;background:#f1f5f9;border:2px solid #cbd5e1;display:grid;place-items:center;font:900 1.25rem Nunito,sans-serif;color:#1D3557;}
.g5-term.on{background:#ede9fe;border-color:#8b5cf6;color:#7c3aed;}
.g5-rect-grid{display:grid;gap:2px;justify-content:center;margin:.6rem auto;max-width:360px;}
.g5-cell{width:24px;height:24px;background:#bfdbfe;border:1px solid #93c5fd;}
.g5-bars{display:flex;align-items:flex-end;justify-content:center;gap:.8rem;height:190px;border-bottom:2px solid #cbd5e1;margin:.4rem auto;max-width:520px;}
.g5-bar-col{width:54px;border-radius:10px 10px 0 0;background:#3b82f6;min-height:4px;position:relative;display:flex;align-items:flex-start;justify-content:center;color:#0f172a;font-weight:900;padding-top:4px;}
.g5-bar-wrap{text-align:center;font-size:.75rem;color:#475569;font-weight:900;}
.g5-scale{position:relative;height:84px;max-width:560px;margin:.8rem auto;}
.g5-scale-line{position:absolute;left:5%;right:5%;top:38px;height:12px;border-radius:999px;background:linear-gradient(90deg,#ef4444,#f59e0b,#22c55e);}
.g5-scale-dot{position:absolute;top:28px;width:32px;height:32px;border-radius:50%;background:#4f46e5;border:4px solid #fff;box-shadow:0 4px 12px rgba(0,0,0,.22);transform:translateX(-50%);}
@media(max-width:560px){
  .g5-frac-stage{grid-template-columns:1fr;}
  .g5-pie{margin:auto;}
  .g5-digit{width:52px;height:58px;font-size:1.45rem;}
}
.nb-tip::before{content:'💡  ';}

/* ── İki sütun grid ── */
.nb-grid2{display:grid;grid-template-columns:1fr 1fr;gap:.6rem;margin-bottom:.6rem;}
@media(max-width:500px){.nb-grid2{grid-template-columns:1fr;}}
.nb-grid2 .nb-def{margin-bottom:0;}

/* PRACTICE */
.grade-select{display:flex;gap:8px;flex-wrap:wrap;}
.grade-btn{padding:8px 16px;border-radius:10px;border:2px solid var(--border);background:#fff;font-family:'Nunito',sans-serif;font-weight:700;font-size:.9rem;cursor:pointer;transition:color .15s ease,background .15s ease,border-color .15s ease;color:var(--muted);}
.grade-btn.active{background:var(--navy);color:#fff;border-color:var(--navy);}
.grade-btn:hover:not(.active){border-color:var(--navy);color:var(--navy);}
.score-bar{background:#fff;border-radius:16px;border:2px solid var(--border);padding:1.2rem 1.5rem;display:flex;align-items:center;gap:16px;margin-bottom:1.5rem;}
.slabel{font-weight:800;font-size:.9rem;color:var(--muted);}
.sval{font-size:1.5rem;font-weight:900;color:var(--navy);}
.sstars{font-size:1.2rem;letter-spacing:2px;}
.quiz-box{background:#fff;border-radius:20px;border:2px solid var(--border);padding:2rem;margin-bottom:1.5rem;}
.quiz-meta{display:flex;align-items:center;gap:10px;margin-bottom:1.2rem;}
.qlevel{color:#fff;font-size:.75rem;font-weight:800;padding:4px 10px;border-radius:8px;text-transform:uppercase;}
.qsubj{color:var(--muted);font-size:.9rem;font-weight:700;}
.qfigure{background:var(--bg);border:2px solid var(--border);border-radius:12px;padding:1rem;margin-bottom:1.2rem;display:flex;justify-content:center;}
.qstory{background:#eff6ff;border-left:4px solid var(--sky);border-radius:0 10px 10px 0;padding:.8rem 1rem;margin-bottom:1rem;font-size:.92rem;color:#1e3a5f;font-weight:600;line-height:1.6;}
.qtext{font-size:1.2rem;font-weight:800;color:var(--navy);margin-bottom:1.4rem;line-height:1.5;}
.options{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin-bottom:1.4rem;}
.opt-btn{background:var(--bg);border:2px solid var(--border);border-radius:12px;padding:11px 14px;text-align:left;font-family:'Nunito',sans-serif;font-size:.97rem;font-weight:700;cursor:pointer;transition:color .15s ease,background .15s ease;color:var(--text);}
.opt-btn:hover:not(:disabled){border-color:var(--sky);background:#f0f8ff;}
.opt-btn.selp{border-color:var(--sky);background:#eff6ff;}
.opt-btn.correct{background:#d1fae5;border-color:var(--green);color:#065f46;}
.opt-btn.wrong{background:#fee2e2;border-color:var(--red);color:#991b1b;}
.quiz-actions{display:flex;gap:10px;align-items:center;flex-wrap:wrap;}
.quiz-btn-row{display:flex;gap:10px;flex-wrap:wrap;margin-top:4px;}
.qbtn{display:inline-flex;align-items:center;gap:7px;padding:12px 22px;border:none;border-radius:14px;font:800 14px Nunito,sans-serif;cursor:pointer;transition:transform .18s ease,background .18s ease,box-shadow .18s ease;letter-spacing:.3px;}
.qbtn:active{transform:scale(.96);}
.qbtn:disabled{opacity:.38;cursor:not-allowed;transform:none;}
.qbtn-icon{font-size:15px;}
.qbtn-check{background:linear-gradient(135deg,var(--navy),#2d4f7c);color:#fff;box-shadow:0 4px 14px rgba(29,53,87,.30);}
.qbtn-check:hover:not(:disabled){background:linear-gradient(135deg,#2d4f7c,var(--sky));box-shadow:0 6px 18px rgba(29,53,87,.40);}
.qbtn-skip{background:linear-gradient(135deg,#f59e0b,#d97706);color:#fff;box-shadow:0 4px 14px rgba(245,158,11,.28);}
.qbtn-skip:hover:not(:disabled){background:linear-gradient(135deg,#fbbf24,#f59e0b);box-shadow:0 6px 18px rgba(245,158,11,.38);}
.qbtn-next{background:linear-gradient(135deg,var(--green),#16a34a);color:#fff;box-shadow:0 4px 14px rgba(45,198,83,.28);display:none;}
.qbtn-next:hover:not(:disabled){background:linear-gradient(135deg,#34d058,var(--green));box-shadow:0 6px 18px rgba(45,198,83,.38);}
.fbmsg{font:700 13px Nunito,sans-serif;padding:10px 14px;border-radius:10px;margin-top:8px;display:block;min-height:18px;}
.fbmsg.ok{color:var(--green);}
.fbmsg.no{color:var(--red);}

/* LGS SIMULATION */
.lgs-promo{max-width:820px;margin:22px auto 0;background:linear-gradient(135deg,#1D3557,#294c7c);border:2px solid #60a5fa;border-radius:18px;padding:18px;display:grid;grid-template-columns:72px 1fr auto;gap:16px;align-items:center;color:#fff;cursor:pointer;box-shadow:0 12px 30px rgba(29,53,87,.18);transition:transform .18s ease,box-shadow .18s ease;}
.lgs-promo:hover{transform:translateY(-3px);box-shadow:0 18px 38px rgba(29,53,87,.28);}
.lgs-promo-mark{width:64px;height:64px;border-radius:16px;background:#fff;color:var(--navy);display:grid;place-items:center;font:900 21px Space Mono,monospace;box-shadow:4px 4px 0 var(--gold);}
.lgs-promo-kicker{font:900 12px Nunito,sans-serif;color:#bfdbfe;text-transform:uppercase;margin-bottom:3px;}
.lgs-promo h3{font:900 22px Nunito,sans-serif;margin:0 0 4px;}
.lgs-promo p{font:800 14px Nunito,sans-serif;color:rgba(255,255,255,.82);line-height:1.45;margin:0;}
.lgs-promo button{border:0;border-radius:12px;background:var(--gold);color:var(--navy);font:900 13px Nunito,sans-serif;padding:11px 18px;cursor:pointer;}
.lgs-exam-shell{background:#f8fafc;border:2px solid #dbeafe;border-radius:20px;overflow:hidden;box-shadow:0 10px 30px rgba(29,53,87,.1);}
.lgs-topbar{display:grid;grid-template-columns:auto 1fr auto;align-items:center;gap:14px;background:linear-gradient(135deg,#102542,#1D3557);color:#fff;padding:14px 16px;}
.lgs-back{border:0;background:rgba(255,255,255,.12);color:#fff;border-radius:10px;padding:9px 12px;font:900 12px Nunito,sans-serif;cursor:pointer;}
.lgs-top-kicker{font:900 11px Nunito,sans-serif;color:#bfdbfe;text-transform:uppercase;letter-spacing:.5px;}
.lgs-top-title{font:900 18px Nunito,sans-serif;margin-top:2px;}
.lgs-timer{background:#fff;color:var(--red);border-radius:14px;padding:9px 15px;font:900 24px Space Mono,monospace;min-width:104px;text-align:center;}
.lgs-timer.warn{background:#fee2e2;animation:lgsPulse 1s infinite;}
@keyframes lgsPulse{0%,100%{transform:scale(1);}50%{transform:scale(1.04);}}
.lgs-layout{display:grid;grid-template-columns:minmax(0,1fr) 310px;gap:16px;padding:16px;}
.lgs-paper,.lgs-omr,.lgs-result-card{background:#fff;border:2px solid var(--border);border-radius:18px;padding:18px;}
.lgs-question-meta{display:flex;justify-content:space-between;gap:10px;margin-bottom:12px;}
.lgs-question-meta span{display:inline-flex;border-radius:999px;padding:5px 11px;font:900 12px Nunito,sans-serif;background:#eff6ff;color:#1d4ed8;}
.lgs-question-text{font:900 21px Nunito,sans-serif;color:var(--navy);line-height:1.45;margin-bottom:16px;}
.lgs-options{display:grid;grid-template-columns:1fr;gap:9px;margin-bottom:16px;}
.lgs-opt{border:2px solid #e2e8f0;background:#f8fafc;color:#1f2937;border-radius:14px;padding:13px 15px;text-align:left;font:800 15px Nunito,sans-serif;cursor:pointer;transition:.15s;}
.lgs-opt:hover{border-color:#93c5fd;background:#eff6ff;}
.lgs-opt.selected{border-color:var(--navy);background:#dbeafe;color:var(--navy);}
.lgs-nav-row{display:flex;gap:8px;justify-content:space-between;flex-wrap:wrap;}
.lgs-nav-row button{border:0;border-radius:12px;padding:10px 14px;font:900 13px Nunito,sans-serif;cursor:pointer;background:#eff6ff;color:#1d4ed8;}
.lgs-nav-row button:nth-child(2){background:#fff7ed;color:#c2410c;}
.lgs-omr{position:sticky;top:92px;align-self:start;}
.lgs-omr-head{display:flex;justify-content:space-between;align-items:flex-start;gap:10px;margin-bottom:12px;}
.lgs-omr-kicker{font:900 11px Nunito,sans-serif;text-transform:uppercase;color:#64748b;margin-bottom:4px;}
.lgs-omr-head strong{font:900 20px Space Mono,monospace;color:var(--navy);}
.lgs-mini-score{font:900 12px Nunito,sans-serif;background:#f1f5f9;color:#475569;border-radius:999px;padding:6px 10px;}
.lgs-omr-grid{display:flex;flex-direction:column;gap:6px;max-height:560px;overflow:auto;padding-right:2px;}
.lgs-omr-row{display:grid;grid-template-columns:30px repeat(4,1fr);gap:5px;align-items:center;background:#f8fafc;border:1px solid #e2e8f0;border-radius:10px;padding:6px;}
.lgs-omr-row.active{outline:2px solid #60a5fa;background:#eff6ff;}
.lgs-omr-no{font:900 12px Space Mono,monospace;color:#475569;text-align:center;border:0;background:transparent;cursor:pointer;}
.lgs-bubble{height:26px;border-radius:999px;border:2px solid #cbd5e1;background:#fff;color:#64748b;font:900 11px Nunito,sans-serif;cursor:pointer;}
.lgs-bubble.on{background:var(--navy);border-color:var(--navy);color:#fff;}
.lgs-submit{width:100%;margin-top:14px;border:0;border-radius:14px;background:linear-gradient(135deg,var(--red),#b91c1c);color:#fff;padding:13px;font:900 14px Nunito,sans-serif;cursor:pointer;box-shadow:0 8px 18px rgba(230,57,70,.22);}
.lgs-submit-note{font:800 12px Nunito,sans-serif;color:#64748b;text-align:center;margin-top:8px;}
.lgs-result-card{max-width:1100px;margin:0 auto;}
.lgs-result-head{display:flex;justify-content:space-between;align-items:center;gap:12px;margin-bottom:14px;}
.lgs-result-head h2{font:900 26px Nunito,sans-serif;color:var(--navy);margin:0;}
.lgs-result-summary{display:grid;grid-template-columns:repeat(4,1fr);gap:10px;margin-bottom:16px;}
.lgs-stat{background:#f8fafc;border:1.5px solid #e2e8f0;border-radius:14px;padding:14px;text-align:center;}
.lgs-stat strong{display:block;font:900 28px Space Mono,monospace;color:var(--navy);}
.lgs-stat span{font:900 11px Nunito,sans-serif;color:#64748b;text-transform:uppercase;}
.lgs-topic-report{display:grid;grid-template-columns:repeat(auto-fit,minmax(190px,1fr));gap:10px;margin-bottom:16px;}
.lgs-topic-card{border:1.5px solid #e2e8f0;border-radius:14px;padding:12px;background:#fff;}
.lgs-topic-card strong{display:block;font:900 13px Nunito,sans-serif;color:var(--navy);margin-bottom:6px;}
.lgs-topic-bar{height:8px;background:#e2e8f0;border-radius:999px;overflow:hidden;margin-bottom:6px;}
.lgs-topic-bar span{display:block;height:100%;background:var(--green);}
.lgs-review-list{display:flex;flex-direction:column;gap:9px;}
.lgs-review-item{border:1.5px solid #e2e8f0;border-radius:14px;padding:12px;background:#f8fafc;}
.lgs-review-item.bad{border-color:#fecaca;background:#fff5f5;}
.lgs-review-item.good{border-color:#bbf7d0;background:#f0fdf4;}
.lgs-review-item strong{color:var(--navy);}
.lgs-review-item p{margin-top:4px;color:#475569;font:800 13px Nunito,sans-serif;}
@media(max-width:900px){
  .lgs-promo{grid-template-columns:56px 1fr;align-items:start;}
  .lgs-promo button{grid-column:1/-1;}
  .lgs-layout{grid-template-columns:1fr;}
  .lgs-omr{position:static;}
  .lgs-topbar{grid-template-columns:1fr;align-items:start;}
  .lgs-result-summary{grid-template-columns:repeat(2,1fr);}
}

/* QC */
.qc-header{background:linear-gradient(135deg,#7B2FBE,#4B0082);border-radius:20px;padding:2rem;color:#fff;margin-bottom:1.2rem;position:relative;overflow:hidden;}
.qc-header::before{content:'∑ ∫ π √ △';position:absolute;top:50%;right:2rem;transform:translateY(-50%);font-family:'Space Mono',monospace;font-size:1.8rem;opacity:.12;letter-spacing:8px;}
.qc-header h2{font-size:1.6rem;font-weight:900;margin-bottom:.4rem;}
.qc-header p{opacity:.85;font-size:.93rem;}
.ai-badge{display:inline-flex;align-items:center;gap:6px;background:rgba(255,255,255,.2);border:1px solid rgba(255,255,255,.3);padding:4px 12px;border-radius:20px;font-size:.8rem;font-weight:700;margin-bottom:10px;}
.ai-dot{width:8px;height:8px;background:var(--gold);border-radius:50%;opacity:.4;}
.panel.active .ai-dot{animation:pulse 1.5s infinite;}
@keyframes pulse{0%,100%{opacity:1;}50%{opacity:.4;}}
.qc-form{background:#fff;border-radius:20px;border:2px solid var(--border);padding:1.8rem;margin-bottom:1.5rem;}
.form-row{display:grid;grid-template-columns:1fr 1fr;gap:1rem;margin-bottom:1rem;}
.form-row-3{display:grid;grid-template-columns:1fr 1fr 1fr;gap:1rem;margin-bottom:1.2rem;}
.fg{display:flex;flex-direction:column;gap:6px;}
.flabel{font-size:.82rem;font-weight:800;color:var(--navy);text-transform:uppercase;letter-spacing:.5px;}
.fsel{padding:10px 14px;border:2px solid var(--border);border-radius:10px;font-family:'Nunito',sans-serif;font-size:.95rem;font-weight:600;color:var(--text);background:var(--bg);appearance:none;}
.fsel:focus{outline:none;border-color:var(--purple);}
.btn-gen{width:100%;background:linear-gradient(135deg,#7B2FBE,#E63946);color:#fff;padding:14px;border-radius:14px;font-family:'Nunito',sans-serif;font-size:1.05rem;font-weight:900;border:none;cursor:pointer;transition:color .2s ease,border-color .2s ease,background .2s ease;display:flex;align-items:center;justify-content:center;gap:10px;box-shadow:0 4px 20px rgba(123,47,190,.35);}
.btn-gen:hover:not(:disabled){transform:translateY(-2px);}
.btn-gen:disabled{opacity:.65;cursor:not-allowed;}

/* Grade info tag in form */
.grade-info{background:#f0fdf4;border:1.5px solid #86efac;border-radius:10px;padding:.7rem 1rem;font-size:.82rem;font-weight:700;color:#166534;margin-bottom:1.2rem;line-height:1.6;}

/* QC quiz area */
.qc-area{background:#fff;border-radius:20px;border:2px solid var(--border);overflow:hidden;}
.qc-hd{background:var(--navy);color:#fff;padding:1rem 1.5rem;display:flex;align-items:center;justify-content:space-between;}
.qc-hd h3{font-size:1rem;font-weight:800;}
.prog-txt{font-size:.85rem;opacity:.75;}
.qc-body{padding:1.5rem;}
.placeholder{display:flex;flex-direction:column;align-items:center;justify-content:center;height:220px;color:var(--muted);text-align:center;gap:10px;}
.ph-icon{font-size:3rem;opacity:.35;}
.loading-dots{display:flex;gap:6px;justify-content:center;align-items:center;height:220px;}
.dot{width:10px;height:10px;background:var(--purple);border-radius:50%;}
.panel.active .dot{animation:bounce 1.2s infinite;}
.dot:nth-child(2){animation-delay:.2s;}
.dot:nth-child(3){animation-delay:.4s;}
@keyframes bounce{0%,100%{transform:translateY(0);}50%{transform:translateY(-12px);}}
.qcard{background:var(--bg);border-radius:16px;border:2px solid var(--border);padding:1.4rem;margin-bottom:1.2rem;transition:border-color .2s;}
.qcard.answered{border-color:#c7d2fe;}
.qcard.rc{border-color:var(--green);background:#f0fdf4;}
.qcard.rw{border-color:var(--red);background:#fff5f5;}
.qnum{display:inline-flex;align-items:center;justify-content:center;width:28px;height:28px;background:var(--purple);color:#fff;border-radius:8px;font-size:.8rem;font-weight:900;margin-bottom:8px;font-family:'Space Mono',monospace;}
.qnum.cn{background:var(--green);}
.qnum.wn{background:var(--red);}
.qkaz{font-size:.74rem;color:var(--purple);font-weight:700;margin-bottom:8px;font-family:'Space Mono',monospace;}
.qstory-card{background:#eff6ff;border-left:4px solid var(--sky);border-radius:0 10px 10px 0;padding:.75rem 1rem;margin-bottom:.9rem;font-size:.9rem;color:#1e3a5f;font-weight:600;line-height:1.6;}
.qfig{background:#fff;border:2px solid var(--border);border-radius:12px;padding:.8rem;margin-bottom:.9rem;display:flex;justify-content:center;align-items:center;}
.qfig svg{max-width:260px;height:auto;display:block;}
.qtext-card{font-size:1rem;font-weight:800;color:var(--navy);line-height:1.6;margin-bottom:10px;}
.qopts{display:flex;flex-direction:column;gap:6px;}
.qopt{background:#fff;border:2px solid var(--border);border-radius:10px;padding:9px 14px;text-align:left;font-family:'Nunito',sans-serif;font-size:.95rem;font-weight:700;cursor:pointer;transition:color .15s ease,background .15s ease;color:var(--text);}
.qopt:hover:not(:disabled):not(.qcs){border-color:var(--sky);background:#f0f8ff;}
.qopt.qcs{border-color:var(--sky);background:#eff6ff;color:var(--navy);}
.qopt.qcc{background:#d1fae5;border-color:var(--green);color:#065f46!important;}
.qopt.qcw{background:#fee2e2;border-color:var(--red);color:#991b1b!important;}
.qopt:disabled{cursor:default;}
.qexp{margin-top:10px;padding:8px 12px;background:#f5f3ff;border-radius:8px;font-size:.85rem;color:var(--purple);font-weight:700;display:none;}
.qexp.show{display:block;}
.action-bar{padding:1rem 1.5rem;background:var(--bg);border-top:2px solid var(--border);display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:10px;}
.btn-submit{background:linear-gradient(135deg,#7B2FBE,#E63946);color:#fff;padding:12px 30px;border-radius:12px;font-family:'Nunito',sans-serif;font-weight:900;font-size:1rem;border:none;cursor:pointer;transition:transform .2s ease,box-shadow .2s ease;box-shadow:0 4px 15px rgba(123,47,190,.3);}
.btn-submit:hover:not(:disabled){transform:translateY(-2px);}
.btn-submit:disabled{opacity:.45;cursor:not-allowed;}
.btn-retry{background:var(--navy);color:#fff;padding:12px 24px;border-radius:12px;font-family:'Nunito',sans-serif;font-weight:800;font-size:.95rem;border:none;cursor:pointer;}
.btn-retry:hover{background:var(--sky);}
.warn{font-size:.88rem;color:var(--red);font-weight:700;}
.phint{font-size:.88rem;color:var(--muted);font-weight:700;}
.res-box{background:#fff;border-radius:16px;border:2px solid var(--border);padding:1.5rem;margin-bottom:1.5rem;display:flex;align-items:center;gap:20px;flex-wrap:wrap;}
.res-big{font-size:3rem;font-weight:900;color:var(--navy);font-family:'Space Mono',monospace;}
.res-big span{font-size:1.4rem;color:var(--muted);}
.res-msg{font-size:1rem;font-weight:800;color:var(--navy);}
.res-sub{font-size:.85rem;color:var(--muted);margin-top:4px;}
.res-stars{font-size:2rem;letter-spacing:4px;margin-left:auto;}

/* TOOLS */
.tools-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:1.2rem;}
.tool-card{background:#fff;border-radius:18px;border:2px solid var(--border);padding:1.5rem;text-align:center;transition:transform .2s ease,box-shadow .2s ease,border-color .2s ease;cursor:pointer;}
.tool-card:hover{transform:translateY(-4px);box-shadow:0 12px 30px rgba(0,0,0,.1);border-color:var(--sky);}
.te{font-size:2.5rem;display:block;margin-bottom:.8rem;}
.tn{font-weight:800;font-size:1rem;color:var(--navy);margin-bottom:.3rem;}
.td{font-size:.83rem;color:var(--muted);line-height:1.5;}
.calc-box{background:#fff;border-radius:20px;border:2px solid var(--border);padding:1.5rem;max-width:340px;margin:1.5rem auto 0;}
.calc-disp{background:var(--navy);color:#fff;border-radius:12px;padding:1rem 1.2rem;text-align:right;margin-bottom:1rem;}
.cexpr{font-size:.85rem;opacity:.6;min-height:20px;font-family:'Space Mono',monospace;}
.cval{font-size:2rem;font-weight:700;font-family:'Space Mono',monospace;}
.calc-btns{display:grid;grid-template-columns:repeat(4,1fr);gap:8px;}
.cb{padding:14px 6px;border-radius:10px;border:none;cursor:pointer;font-family:'Nunito',sans-serif;font-size:1rem;font-weight:700;background:var(--bg);color:var(--navy);transition:background .1s ease,color .1s ease;}
.cb:hover{background:var(--border);}
.cb.op{background:var(--sky);color:#fff;}
.cb.eq{background:var(--red);color:#fff;grid-column:span 2;}
.cb.cl{background:var(--gold);color:var(--navy);}
.cb:active{transform:scale(.95);}

@media(max-width:640px){
  .panel{padding:1rem;}
  .hero{padding:1.8rem;}
  .hero h1{font-size:1.7rem;}
  .form-row,.form-row-3{grid-template-columns:1fr;}
  .options{grid-template-columns:1fr;}
  header{padding:0 1rem;}
  .logo{gap:10px;}
  .logo-text{font-size:1.05rem;}
  .logo-domain{font-size:.56rem;}
}

/* ── Araç Sekmeleri ── */
.tool-tabs{display:flex;gap:6px;flex-wrap:wrap;margin-bottom:16px;}
.tool-tab-btn{padding:9px 18px;border:2px solid #e2e8f0;border-radius:10px;background:#fff;color:#64748b;font:bold 13px Nunito,sans-serif;cursor:pointer;transition:.2s;}
.tool-tab-btn.active{background:var(--navy);color:#fff;border-color:var(--navy);}
.tool-panel{display:none;}
.tool-panel.active{display:block;}

/* ── Hesap Makinesi ── */
.calc-box{background:#fff;border-radius:20px;border:2px solid var(--border);padding:20px;max-width:340px;margin:0 auto;box-shadow:0 4px 20px rgba(29,53,87,.10);}
.calc-disp{background:var(--navy);border-radius:12px;padding:14px 18px;margin-bottom:14px;text-align:right;min-height:72px;display:flex;flex-direction:column;justify-content:flex-end;}
.cexpr{color:rgba(255,255,255,.55);font:13px Space Mono,monospace;min-height:18px;word-break:break-all;}
.cval{color:#fff;font:bold 36px Space Mono,monospace;line-height:1.1;word-break:break-all;}
.calc-btns{display:grid;grid-template-columns:repeat(4,1fr);gap:8px;}
.cb{padding:14px 8px;border:none;border-radius:12px;font:bold 16px Nunito,sans-serif;cursor:pointer;transition:.12s;background:var(--bg);color:var(--navy);}
.cb:hover{background:var(--border);transform:scale(1.04);}
.cb:active{transform:scale(.96);}
.cb.op{background:var(--sky);color:#fff;}
.cb.cl{background:var(--gold);color:var(--navy);}
.cb.eq{background:var(--red);color:#fff;font-size:18px;}
.cb.sp{background:#e8f5e9;color:#15803d;font-size:13px;}
.calc-history{margin-top:12px;max-height:80px;overflow-y:auto;display:flex;flex-direction:column;gap:3px;border-top:1px solid var(--border);padding-top:8px;}
.hist-item{color:#94a3b8;font:12px Space Mono,monospace;text-align:right;padding:2px 4px;}
.hist-item span{color:var(--navy);font-weight:700;}

/* ── Formüller ── */
.formula-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:14px;}
.fcat{background:#fff;border-radius:14px;padding:14px;border:1.5px solid #e2e8f0;}
.fcat-title{font:bold 13px Nunito,sans-serif;color:var(--navy);margin-bottom:10px;padding-bottom:6px;border-bottom:2px solid #f1f5f9;}
.frow{display:flex;justify-content:space-between;align-items:center;padding:5px 0;border-bottom:1px solid #f8fafc;}
.frow:last-child{border-bottom:none;}
.fshape{font:13px Nunito,sans-serif;color:#475569;}
.fformula{font:bold 13px Space Mono,monospace;color:var(--sky);background:#f0f9ff;padding:2px 8px;border-radius:6px;}

/* ── Birim Çevirici ── */
.conv-tabs{display:flex;gap:6px;flex-wrap:wrap;margin-bottom:14px;}
.conv-cat{padding:6px 14px;border:1.5px solid #e2e8f0;border-radius:8px;background:#fff;color:#64748b;font:bold 11px Nunito,sans-serif;cursor:pointer;transition:.15s;}
.conv-cat.active{background:var(--sky);color:#fff;border-color:var(--sky);}
.conv-body{background:#fff;border-radius:14px;padding:16px;border:1.5px solid #e2e8f0;}
.conv-row{display:flex;align-items:center;gap:8px;flex-wrap:wrap;margin-bottom:12px;}
.conv-inp{padding:8px 12px;border:2px solid #e2e8f0;border-radius:8px;font:bold 15px Space Mono,monospace;width:100px;color:var(--navy);}
.conv-sel{padding:8px 10px;border:2px solid #e2e8f0;border-radius:8px;font:13px Nunito,sans-serif;color:var(--navy);background:#fff;cursor:pointer;}
.conv-arrow{font-size:20px;color:var(--sky);}
.conv-result{font:bold 22px Space Mono,monospace;color:var(--navy);text-align:center;padding:12px;background:#f0f9ff;border-radius:10px;margin-bottom:12px;}
.conv-table{display:grid;grid-template-columns:repeat(auto-fill,minmax(150px,1fr));gap:6px;}
.conv-cell{background:#f8fafc;border-radius:8px;padding:6px 10px;border:1px solid #e2e8f0;}
.conv-cell .cu{font:10px Nunito,sans-serif;color:#94a3b8;}
.conv-cell .cv{font:bold 12px Space Mono,monospace;color:var(--navy);}

/* ── Grafik Çizici ── */
.graph-tool{background:#fff;border:2px solid #dbeafe;border-radius:18px;box-shadow:0 6px 24px rgba(29,53,87,.10);overflow:hidden;}
.graph-tool:has(.graph-tip-wrap:hover),.graph-tool:has(.graph-tip-wrap:focus-visible){overflow:visible;}
.graph-tool.graph-fullscreen{position:fixed;inset:0;width:100vw;height:100vh;z-index:10000;border-radius:0;border:0;box-shadow:none;display:flex;flex-direction:column;background:#eef6ff;}
.graph-tool.graph-fullscreen .graph-head{border-radius:0;flex-shrink:0;}
.graph-tool.graph-fullscreen .graph-layout{flex:1;min-height:0;grid-template-columns:minmax(280px,360px) 1fr;}
.graph-tool.graph-fullscreen .graph-stage{display:flex;min-height:0;}
.graph-tool.graph-fullscreen #graph-canvas{height:100%;min-height:0;}
.graph-head{display:flex;justify-content:space-between;align-items:center;gap:12px;padding:14px 16px;background:linear-gradient(135deg,#1D3557,#284b75);color:#fff;position:relative;z-index:20;overflow:visible;}
.graph-title{font:900 20px Nunito,sans-serif;}
.graph-sub{font:700 12px Nunito,sans-serif;color:rgba(255,255,255,.72);margin-top:2px;}
.graph-actions{display:flex;gap:6px;flex-wrap:wrap;justify-content:flex-end;}
.graph-actions button,.graph-add,.graph-examples button{border:none;border-radius:10px;cursor:pointer;font:900 12px Nunito,sans-serif;transition:.15s;}
.graph-actions button{background:rgba(255,255,255,.18);color:#fff;padding:8px 11px;}
.graph-actions button:hover{background:rgba(255,255,255,.3);transform:translateY(-1px);}
.graph-tip-wrap{position:relative;}
.graph-tip{position:absolute;right:50%;top:calc(100% + 10px);transform:translate(50%,-4px);min-width:170px;background:#111827;color:#fff;border-radius:10px;padding:8px 10px;font:800 11px Nunito,sans-serif;line-height:1.35;box-shadow:0 10px 26px rgba(15,23,42,.25);opacity:0;pointer-events:none;transition:opacity .16s ease,transform .16s ease;z-index:60;}
.graph-tip::after{content:'';position:absolute;right:50%;bottom:100%;transform:translateX(50%);border:6px solid transparent;border-bottom-color:#111827;}
.graph-tip-wrap:hover .graph-tip,.graph-tip-wrap:focus-visible .graph-tip{opacity:1;transform:translate(50%,0);}
.graph-layout{display:grid;grid-template-columns:minmax(260px,330px) 1fr;min-height:560px;}
.graph-side{background:#f8fafc;border-right:1.5px solid #dbeafe;padding:14px;display:flex;flex-direction:column;gap:10px;}
.graph-expression-list{display:flex;flex-direction:column;gap:10px;}
.graph-row{display:grid;grid-template-columns:26px 1fr 34px 28px;gap:8px;align-items:center;background:#fff;border:1.5px solid #dbeafe;border-radius:12px;padding:8px;box-shadow:0 2px 8px rgba(29,53,87,.06);}
.graph-eye{width:24px;height:24px;border-radius:50%;border:none;background:#e2e8f0;color:#64748b;font:900 13px Nunito,sans-serif;cursor:pointer;}
.graph-eye.on{background:#dcfce7;color:#16a34a;}
.graph-row input[type=color]{width:34px;height:34px;border:0;background:transparent;padding:0;cursor:pointer;}
.graph-row input{width:100%;border:0;background:#f8fafc;border-radius:8px;padding:9px 10px;font:800 14px Space Mono,monospace;color:#1D3557;outline:2px solid transparent;}
.graph-row input:focus{outline-color:#93c5fd;background:#fff;}
.graph-del{width:28px;height:28px;border:0;border-radius:8px;background:#fee2e2;color:#b91c1c;font:900 16px Nunito,sans-serif;cursor:pointer;}
.graph-add{background:var(--green);color:#fff;padding:10px 12px;}
.graph-examples,.graph-mode,.graph-tools{display:grid;grid-template-columns:repeat(2,1fr);gap:6px;}
.graph-examples button{background:#e0f2fe;color:#075985;padding:8px;}
.graph-mode{grid-template-columns:repeat(3,1fr);}
.graph-mode button,.graph-tools button,.graph-range button{border:none;border-radius:9px;cursor:pointer;font:900 11px Nunito,sans-serif;padding:8px;background:#f1f5f9;color:#475569;transition:.15s;}
.graph-mode button.active{background:#1D3557;color:#fff;}
.graph-tools button{background:#fff7ed;color:#9a3412;border:1px solid #fed7aa;}
.graph-range{display:grid;grid-template-columns:repeat(2,1fr);gap:7px;background:#fff;border:1.5px solid #dbeafe;border-radius:12px;padding:9px;}
.graph-range label{font:900 10px Nunito,sans-serif;color:#64748b;text-transform:uppercase;}
.graph-range input{width:100%;margin-top:3px;border:1.5px solid #dbeafe;border-radius:8px;padding:6px 8px;font:800 12px Space Mono,monospace;color:#1D3557;}
.graph-range button{grid-column:1/-1;background:#1D3557;color:#fff;}
.graph-note{font:700 12px Nunito,sans-serif;color:#64748b;line-height:1.45;background:#fff;border:1.5px dashed #cbd5e1;border-radius:12px;padding:10px;}
.graph-stage{position:relative;z-index:1;min-width:0;background:#eef6ff;padding:12px;}
#graph-canvas{width:100%;height:min(62vh,620px);min-height:420px;display:block;background:#fff;border-radius:14px;border:1.5px solid #bfdbfe;box-shadow:inset 0 0 0 1px rgba(29,53,87,.04);touch-action:none;}
.graph-trace{position:absolute;left:24px;bottom:24px;background:rgba(29,53,87,.92);color:#fff;border-radius:12px;padding:8px 12px;font:800 12px Space Mono,monospace;box-shadow:0 8px 24px rgba(29,53,87,.18);max-width:calc(100% - 48px);}

@media(max-width:820px){
  .graph-layout{grid-template-columns:1fr;}
  .graph-tool.graph-fullscreen .graph-layout{grid-template-columns:1fr;overflow:auto;}
  .graph-side{border-right:0;border-bottom:1.5px solid #dbeafe;}
  #graph-canvas{height:460px;min-height:360px;}
  .graph-tool.graph-fullscreen #graph-canvas{height:68vh;min-height:360px;}
}

/* ── Formül Sekmeleri ── */
.ftabs{display:flex;gap:6px;flex-wrap:wrap;margin-bottom:14px;}
.ftab{padding:8px 16px;border:2px solid #e2e8f0;border-radius:10px;background:#fff;color:#64748b;font:bold 12px Nunito,sans-serif;cursor:pointer;transition:.2s;}
.ftab.active{background:var(--navy);color:#fff;border-color:var(--navy);}
.fcat-panel{display:block;}

.formula-studio-head{display:grid;grid-template-columns:minmax(0,1fr) auto;gap:16px;align-items:center;background:linear-gradient(135deg,#10233f,#1D3557 55%,#457B9D);color:#fff;border-radius:20px;padding:20px;margin-bottom:14px;box-shadow:0 16px 38px rgba(29,53,87,.18);}
.formula-kicker{color:#fbbf24;font:900 11px Nunito,sans-serif;letter-spacing:1.2px;text-transform:uppercase;margin-bottom:5px;}
.formula-studio-head h3{margin:0;font:900 clamp(20px,3vw,30px) Nunito,sans-serif;letter-spacing:0;}
.formula-studio-head p{margin:7px 0 0;max-width:760px;color:#dbeafe;font:800 14px/1.5 Nunito,sans-serif;}
.formula-studio-stats{min-width:124px;border:1px solid rgba(255,255,255,.22);border-radius:16px;padding:12px 14px;background:rgba(255,255,255,.1);text-align:center;}
.formula-studio-stats strong{display:block;font:900 28px Space Mono,monospace;color:#fff;}
.formula-studio-stats span{color:#bfdbfe;font:900 12px Nunito,sans-serif;}
.formula-toolbar{display:grid;grid-template-columns:minmax(220px,1fr) auto;gap:10px;align-items:center;margin-bottom:12px;}
.formula-search{display:flex;align-items:center;gap:9px;background:#fff;border:2px solid #dbe7f5;border-radius:14px;padding:8px 12px;color:#457B9D;font-weight:900;}
.formula-search input{border:none;outline:none;width:100%;min-height:30px;font:800 14px Nunito,sans-serif;color:#1D3557;background:transparent;}
.formula-depth{display:flex;gap:6px;flex-wrap:wrap;justify-content:flex-end;}
.formula-depth button{border:2px solid #e2e8f0;border-radius:999px;background:#fff;color:#64748b;padding:8px 12px;font:900 12px Nunito,sans-serif;cursor:pointer;}
.formula-depth button.active{background:#ecfdf5;border-color:#86efac;color:#166534;}
.formula-category-note{background:#f8fafc;border:1px solid #e2e8f0;border-left:5px solid #457B9D;border-radius:12px;padding:10px 12px;margin:-4px 0 14px;color:#334155;font:800 13px/1.45 Nunito,sans-serif;}

/* ── Formül Kartları ── */
.fcard-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(210px,1fr));gap:14px;}
.fcard{background:#fff;border-radius:16px;border:2px solid #e2e8f0;overflow:hidden;cursor:pointer;transition:.2s;box-shadow:0 8px 22px rgba(29,53,87,.08);position:relative;}
.fcard:hover{border-color:var(--sky);transform:translateY(-3px);box-shadow:0 6px 20px rgba(69,123,157,.2);}
.fcard-canvas{width:100%;display:block;background:#f8fafc;}
.fcard-visual{height:116px;display:grid;place-items:center;background:linear-gradient(180deg,#f8fafc,#eef6ff);font:900 42px Nunito,sans-serif;color:#457B9D;}
.fcard-info{padding:11px 12px 12px;}
.fcard-name{font:900 14px Nunito,sans-serif;color:#1D3557;}
.fcard-eq{font:bold 12px Space Mono,monospace;color:var(--sky);margin-top:3px;line-height:1.35;}
.fcard-tags{display:flex;gap:5px;flex-wrap:wrap;margin-top:8px;}
.fcard-tag{background:#f1f5f9;border:1px solid #e2e8f0;border-radius:999px;padding:3px 7px;color:#64748b;font:900 10px Nunito,sans-serif;}
.fcard-tag.deep{background:#fff7ed;border-color:#fed7aa;color:#9a3412;}
.fcard-tag.reason{background:#ecfdf5;border-color:#bbf7d0;color:#166534;}
.fcard-empty{grid-column:1/-1;background:#fff;border:2px dashed #cbd5e1;border-radius:16px;padding:22px;text-align:center;color:#64748b;font:900 14px Nunito,sans-serif;}

/* ── Formül Modal ── */
#formula-modal-overlay{display:none;position:fixed;inset:0;background:rgba(0,0,0,.55);z-index:9999;align-items:center;justify-content:center;}
#formula-modal-overlay.open{display:flex;}
#formula-modal-box{background:#fff;border-radius:20px;padding:22px;max-width:760px;width:93%;box-shadow:0 20px 60px rgba(0,0,0,.28);max-height:92vh;overflow-y:auto;}
#fm-canvas{width:100%;display:block;border-radius:12px;background:#f8fafc;margin-bottom:4px;}
#fm-result{margin-top:10px;text-align:center;font:bold 14px Space Mono,monospace;color:#1D3557;background:#f0f9ff;padding:10px 14px;border-radius:10px;border:1.5px solid #bae6fd;word-break:break-all;}
.fm-insight{margin-top:12px;display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:10px;}
.fm-card{border:1px solid #e2e8f0;border-radius:12px;background:#f8fafc;padding:10px;color:#334155;font:800 12px/1.45 Nunito,sans-serif;}
.fm-card strong{display:block;color:#1D3557;font:900 11px Nunito,sans-serif;text-transform:uppercase;letter-spacing:.5px;margin-bottom:4px;}
@media(max-width:760px){
  .formula-studio-head,.formula-toolbar{grid-template-columns:1fr;}
  .formula-depth{justify-content:flex-start;}
  .formula-studio-stats{text-align:left;}
  .fm-insight{grid-template-columns:1fr;}
}

/* ── Pratik Seviye Seçim ── */
.psel-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:14px;margin:16px 0;}
.psel-card{background:#fff;border:2.5px solid #e2e8f0;border-radius:18px;padding:20px 16px;text-align:center;cursor:pointer;transition:.2s;box-shadow:0 2px 10px rgba(0,0,0,.06);}
.psel-card:hover{border-color:var(--sky);transform:translateY(-4px);box-shadow:0 8px 24px rgba(69,123,157,.2);}
.psel-card:nth-child(1):hover{border-color:#22c55e;}
.psel-card:nth-child(2):hover{border-color:#3b82f6;}
.psel-card:nth-child(3):hover{border-color:#f59e0b;}
.psel-card:nth-child(4):hover{border-color:#8b5cf6;}
.psel-icon{font-size:36px;margin-bottom:8px;}
.psel-grade{font:900 20px Nunito,sans-serif;color:var(--navy);margin-bottom:4px;}
.psel-topics{font:12px Nunito,sans-serif;color:#64748b;line-height:1.5;margin-bottom:10px;}
.psel-start{display:inline-block;background:var(--navy);color:#fff;padding:6px 18px;border-radius:20px;font:bold 12px Nunito,sans-serif;}
.plevel-row{display:flex;gap:8px;justify-content:center;flex-wrap:wrap;margin-bottom:16px;}
.plevel-btn{padding:9px 22px;border:2px solid #e2e8f0;border-radius:30px;background:#fff;color:#64748b;font:bold 13px Nunito,sans-serif;cursor:pointer;transition:.2s;}
.plevel-btn.active{background:var(--navy);color:#fff;border-color:var(--navy);}
.pquiz-topbar{display:flex;align-items:center;justify-content:space-between;margin-bottom:10px;padding:8px 4px;}

/* ── İletişim Kartı ── */
.card-contact{background:linear-gradient(135deg,#fff5f5,#fff);border:2px solid #fecaca!important;}
.card-contact:hover{border-color:var(--red)!important;box-shadow:0 8px 28px rgba(230,57,70,.18)!important;}
.card-contact h3{color:var(--red);}

/* ── TOOLKIT ── */
.toolkit-header{background:linear-gradient(135deg,#0f172a 0%,#1e3a5f 50%,#0f172a 100%);border-radius:24px;padding:2.5rem 2rem;color:#fff;position:relative;overflow:hidden;margin-bottom:2rem;}
.toolkit-header::before{content:'';position:absolute;top:-40px;right:-40px;width:220px;height:220px;background:radial-gradient(circle,rgba(245,158,11,.2),transparent 70%);border-radius:50%;}
.toolkit-header::after{content:'';position:absolute;bottom:-30px;left:-30px;width:180px;height:180px;background:radial-gradient(circle,rgba(139,92,246,.15),transparent 70%);border-radius:50%;}
.toolkit-header-content{position:relative;z-index:1;text-align:center;}
.toolkit-header h2{font-size:1.8rem;font-weight:900;margin-bottom:.4rem;letter-spacing:-.5px;}
.toolkit-header h2 span{color:#f59e0b;}
.toolkit-header p{opacity:.75;font-size:.95rem;max-width:500px;margin:0 auto;}
.toolkit-badge{display:inline-flex;align-items:center;gap:6px;background:rgba(245,158,11,.2);border:1px solid rgba(245,158,11,.35);color:#fbbf24;padding:4px 14px;border-radius:20px;font-size:.78rem;font-weight:800;margin-bottom:.8rem;letter-spacing:.5px;}
.toolkit-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:1.2rem;}
.toolkit-card{background:#fff;border-radius:20px;border:2px solid var(--border);overflow:hidden;cursor:pointer;transition:transform .25s ease,box-shadow .25s ease,border-color .25s ease;position:relative;}
.toolkit-card:hover{transform:translateY(-5px);box-shadow:0 14px 36px rgba(0,0,0,.12);border-color:var(--sky);}
.toolkit-card-banner{height:140px;display:flex;align-items:center;justify-content:center;position:relative;overflow:hidden;}
.toolkit-card-banner .tk-emoji{font-size:3.5rem;position:relative;z-index:1;filter:drop-shadow(0 4px 8px rgba(0,0,0,.15));}
.toolkit-card-body{padding:1.2rem 1.4rem 1.4rem;}
.toolkit-card-body h3{font-size:1.05rem;font-weight:800;color:var(--navy);margin-bottom:.3rem;}
.toolkit-card-body p{font-size:.84rem;color:var(--muted);line-height:1.55;}
.toolkit-card-tag{position:absolute;top:12px;left:12px;background:rgba(0,0,0,.55);color:#fff;font-size:.7rem;font-weight:800;padding:3px 10px;border-radius:8px;backdrop-filter:blur(4px);}
.toolkit-card-arrow{position:absolute;bottom:1rem;right:1.2rem;width:32px;height:32px;background:var(--navy);color:#fff;border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:.9rem;transition:transform .2s ease,background .2s ease;}
.toolkit-card:hover .toolkit-card-arrow{background:var(--red);transform:translateX(3px);}
.toolkit-iframe-wrap{display:none;}
.toolkit-iframe-wrap.active{display:block;}
.toolkit-back-btn{display:inline-flex;align-items:center;gap:8px;background:var(--navy);color:#fff;border:none;padding:10px 22px;border-radius:12px;font:800 14px Nunito,sans-serif;cursor:pointer;margin-bottom:1rem;transition:background .2s ease,transform .15s ease;}
.toolkit-back-btn:hover{background:var(--sky);transform:translateX(-3px);}
.toolkit-iframe{width:100%;height:85vh;border:2px solid var(--border);border-radius:20px;background:#0f172a;}
.toolkit-empty{text-align:center;padding:3rem 1rem;color:var(--muted);}
.toolkit-empty .tk-empty-icon{font-size:3rem;opacity:.4;margin-bottom:.8rem;}

/* ── OTHER TOOLS ── */
.other-header{display:flex;align-items:center;justify-content:space-between;gap:18px;background:linear-gradient(135deg,#f8fafc,#eef6ff);border:2px solid #dbeafe;border-radius:18px;padding:22px;margin-bottom:18px;box-shadow:0 8px 24px rgba(29,53,87,.08);}
.other-badge{display:inline-flex;align-items:center;gap:6px;background:#dbeafe;color:#1e3a8a;border:1px solid #bfdbfe;border-radius:999px;padding:5px 12px;font:900 12px Nunito,sans-serif;margin-bottom:8px;}
.other-header h2{font:900 30px Nunito,sans-serif;color:var(--navy);margin:0 0 4px;}
.other-header p{font:700 14px Nunito,sans-serif;color:#64748b;margin:0;line-height:1.5;}
.other-header-metrics{display:flex;gap:10px;flex-shrink:0;}
.other-header-metrics div{min-width:92px;background:#fff;border:1.5px solid #dbeafe;border-radius:14px;padding:10px 12px;text-align:center;box-shadow:0 4px 14px rgba(29,53,87,.06);}
.other-header-metrics span{display:block;font:900 24px Space Mono,monospace;color:var(--red);}
.other-header-metrics small{display:block;font:900 11px Nunito,sans-serif;color:#64748b;text-transform:uppercase;}
.other-grid{display:grid;grid-template-columns:minmax(0,1.35fr) minmax(310px,.65fr);gap:18px;align-items:start;}
.other-tool{background:#fff;border:2px solid var(--border);border-radius:18px;padding:16px;box-shadow:0 8px 24px rgba(15,23,42,.07);}
.other-tool-head{display:flex;justify-content:space-between;align-items:flex-start;gap:12px;margin-bottom:12px;}
.other-tool-kicker{font:900 12px Nunito,sans-serif;color:var(--sky);text-transform:uppercase;letter-spacing:.4px;margin-bottom:3px;}
.other-tool h3{font:900 20px Nunito,sans-serif;color:var(--navy);margin:0;}
.other-tool-brand{display:none;font:900 13px Nunito,sans-serif;color:#64748b;margin-top:5px;}
.other-tool-brand span{color:var(--gold);}
.scratch-actions,.scratch-toolbar,.pomo-main-actions,.pomo-custom,.pomo-head-actions{display:flex;align-items:center;gap:8px;flex-wrap:wrap;}
.scratch-actions button,.scratch-chip,.pomo-reset,.pomo-full,.pomo-mode-row button,.pomo-start,.pomo-skip,.pomo-custom button{border:none;border-radius:10px;cursor:pointer;font:900 12px Nunito,sans-serif;transition:.15s;}
.scratch-actions button{background:#eff6ff;color:#1d4ed8;padding:8px 11px;}
.scratch-actions button:hover,.scratch-chip:hover,.pomo-mode-row button:hover,.pomo-custom button:hover{transform:translateY(-1px);}
.scratch-toolbar{background:#f8fafc;border:1.5px solid #e2e8f0;border-radius:14px;padding:10px;margin-bottom:12px;}
.scratch-toolbar label{display:flex;align-items:center;gap:8px;font:900 12px Nunito,sans-serif;color:#475569;}
.scratch-toolbar input[type=color]{width:34px;height:30px;border:0;background:transparent;cursor:pointer;}
.scratch-toolbar input[type=range]{width:108px;accent-color:var(--navy);}
.scratch-chip{background:#fff;color:#475569;border:1.5px solid #e2e8f0;padding:8px 12px;}
.scratch-chip.active{background:var(--navy);color:#fff;border-color:var(--navy);}
.scratch-stage{position:relative;background:#fff;border:2px solid #dbeafe;border-radius:16px;overflow:hidden;min-height:420px;}
#scratch-canvas{display:block;width:100%;height:520px;touch-action:none;cursor:crosshair;background:#fff;}
.scratch-empty{position:absolute;left:18px;top:16px;color:#94a3b8;font:900 13px Nunito,sans-serif;pointer-events:none;background:rgba(255,255,255,.82);border:1px dashed #cbd5e1;border-radius:12px;padding:8px 12px;}
.pomodoro-tool{position:sticky;top:96px;}
.pomo-full{background:#eff6ff;color:#1d4ed8;padding:8px 12px;}
.pomo-reset{background:#fee2e2;color:#b91c1c;padding:8px 12px;}
.pomo-mode-row{display:grid;grid-template-columns:repeat(3,1fr);gap:8px;margin-bottom:14px;}
.pomo-mode-row button{background:#f1f5f9;color:#475569;padding:10px 8px;}
.pomo-mode-row button.active{background:var(--navy);color:#fff;}
.pomo-dial{position:relative;display:grid;place-items:center;margin:8px auto 14px;width:min(260px,100%);aspect-ratio:1;}
.pomo-dial svg{position:absolute;inset:0;width:100%;height:100%;transform:rotate(-90deg);}
.pomo-ring-bg{fill:none;stroke:#e2e8f0;stroke-width:14;}
.pomo-ring{fill:none;stroke:var(--green);stroke-width:14;stroke-linecap:round;stroke-dasharray:578;stroke-dashoffset:0;transition:stroke-dashoffset .3s ease,stroke .2s ease;}
.pomo-time{font:900 42px Space Mono,monospace;color:var(--navy);line-height:1;}
.pomo-state{position:absolute;bottom:54px;font:900 12px Nunito,sans-serif;color:#64748b;text-transform:uppercase;}
.pomo-main-actions{justify-content:center;margin-bottom:12px;}
.pomo-start{background:linear-gradient(135deg,var(--green),#16a34a);color:#fff;padding:12px 28px;font-size:15px;}
.pomo-start.running{background:linear-gradient(135deg,var(--gold),#f97316);color:#1f2937;}
.pomo-skip{background:#eff6ff;color:#1d4ed8;padding:12px 18px;}
.pomo-custom{justify-content:center;background:#f8fafc;border:1.5px solid #e2e8f0;border-radius:14px;padding:10px;margin-bottom:12px;}
.pomo-custom label{display:flex;align-items:center;gap:8px;font:900 12px Nunito,sans-serif;color:#475569;}
.pomo-custom input{width:74px;border:1.5px solid #cbd5e1;border-radius:9px;padding:7px 9px;font:900 13px Space Mono,monospace;color:var(--navy);}
.pomo-custom button{background:var(--sky);color:#fff;padding:8px 12px;}
.pomo-log{border-top:1.5px solid #e2e8f0;padding-top:12px;}
.pomo-log-title{font:900 13px Nunito,sans-serif;color:var(--navy);margin-bottom:8px;}
.pomo-log-list{display:flex;flex-direction:column;gap:7px;max-height:130px;overflow:auto;}
.pomo-log-item{display:flex;justify-content:space-between;gap:10px;background:#f8fafc;border:1px solid #e2e8f0;border-radius:10px;padding:8px 10px;font:800 12px Nunito,sans-serif;color:#475569;}
.pomo-log-empty{color:#94a3b8;font:800 12px Nunito,sans-serif;background:#f8fafc;border-radius:10px;padding:10px;text-align:center;}
.other-fullscreen-slot{display:none;}
.other-tool.other-fullscreen{position:fixed;inset:0;z-index:100000;border:0;border-radius:0;margin:0;padding:18px;background:#fff;display:flex;flex-direction:column;overflow:auto;box-shadow:none;}
.other-tool.other-fullscreen .other-tool-brand{display:block;}
.other-tool.other-fullscreen .scratch-stage{flex:1;min-height:0;}
.other-tool.other-fullscreen #scratch-canvas{height:calc(100vh - 162px);min-height:420px;}
.other-tool.other-fullscreen.pomodoro-tool{position:fixed;top:0;align-items:center;justify-content:center;}
.other-tool.other-fullscreen.pomodoro-tool .other-tool-head,.other-tool.other-fullscreen.pomodoro-tool .pomo-mode-row,.other-tool.other-fullscreen.pomodoro-tool .pomo-main-actions,.other-tool.other-fullscreen.pomodoro-tool .pomo-custom,.other-tool.other-fullscreen.pomodoro-tool .pomo-log{width:min(520px,94vw);}
.other-tool.other-fullscreen.pomodoro-tool .pomo-dial{width:min(420px,86vw);}
.other-tool.other-fullscreen.pomodoro-tool .pomo-time{font-size:58px;}
@media(max-width:900px){
  .other-header{align-items:flex-start;flex-direction:column;}
  .other-header-metrics{width:100%;}
  .other-header-metrics div{flex:1;}
  .other-grid{grid-template-columns:1fr;}
  .pomodoro-tool{position:static;}
  #scratch-canvas{height:430px;}
}

/* ── LANG TOGGLE ── */
.lang-toggle{display:flex;align-items:center;gap:6px;background:rgba(255,255,255,.1);border:1px solid rgba(255,255,255,.25);padding:4px 6px;border-radius:12px;cursor:pointer;transition:background .15s ease;}
.lang-toggle:hover{background:rgba(255,255,255,.2);}
.lang-opt{padding:3px 10px;border-radius:8px;font:700 12px Nunito,sans-serif;color:rgba(255,255,255,.6);transition:all .15s ease;cursor:pointer;border:none;background:none;}
.lang-opt.active{background:rgba(255,255,255,.9);color:var(--navy);}
body { -webkit-user-select: none; -moz-user-select: none; -ms-user-select: none; user-select: none; }

/* ── Geri Bildirim Widget ── */
/* ── Yüzen buton ── */
.fb-trigger{
  position:fixed;
  bottom:24px;right:24px;
  z-index:9990;
  display:flex;
  flex-direction:column;
  align-items:flex-end;
  gap:10px;
}
.fb-btn{
  width:54px;height:54px;
  border-radius:50%;
  border:none;cursor:pointer;
  display:flex;align-items:center;justify-content:center;
  font-size:22px;
  box-shadow:0 4px 18px rgba(0,0,0,.22);
  transition:transform .2s ease, box-shadow .2s ease;
  position:relative;
}
.fb-btn:hover{transform:scale(1.1);box-shadow:0 6px 24px rgba(0,0,0,.3);}
.fb-btn-main{background:var(--navy);}
.fb-btn-wa{background:#25d366;}
.fb-btn-form{background:var(--purple);}
.fb-sub-btns{
  display:flex;flex-direction:column;gap:8px;align-items:flex-end;
  opacity:0;pointer-events:none;
  transform:translateY(10px);
  transition:opacity .25s ease, transform .25s ease;
}
.fb-sub-btns.open{opacity:1;pointer-events:all;transform:translateY(0);}
.fb-sub-row{display:flex;align-items:center;gap:8px;}
.fb-sub-label{
  background:#1D3557;color:#fff;
  font:700 11px 'Nunito',sans-serif;
  padding:4px 10px;border-radius:8px;
  white-space:nowrap;
  box-shadow:0 2px 8px rgba(0,0,0,.18);
}

/* ── Panel ── */
.fb-panel{
  position:fixed;
  bottom:90px;right:24px;
  z-index:9991;
  width:320px;
  background:#fff;
  border-radius:20px;
  box-shadow:0 8px 40px rgba(0,0,0,.18);
  overflow:hidden;
  opacity:0;pointer-events:none;
  transform:translateY(16px) scale(.97);
  transition:opacity .28s ease, transform .28s cubic-bezier(.2,.8,.4,1);
}
.fb-panel.open{opacity:1;pointer-events:all;transform:translateY(0) scale(1);}
.fb-panel-head{
  background:linear-gradient(135deg,var(--navy),#2a4a7f);
  padding:14px 16px;
  display:flex;align-items:center;justify-content:space-between;
}
.fb-panel-title{color:#fff;font:800 14px 'Nunito',sans-serif;}
.fb-panel-sub{color:rgba(255,255,255,.7);font:600 11px 'Nunito',sans-serif;margin-top:2px;}
.fb-panel-close{
  background:rgba(255,255,255,.15);border:none;
  color:#fff;font-size:14px;cursor:pointer;
  width:26px;height:26px;border-radius:50%;
  display:flex;align-items:center;justify-content:center;
  transition:background .15s;
}
.fb-panel-close:hover{background:rgba(255,255,255,.3);}
.fb-panel-body{padding:14px 16px 16px;}

/* Tip seçici */
.fb-type-row{display:flex;gap:6px;margin-bottom:12px;}
.fb-type-btn{
  flex:1;padding:7px 4px;border-radius:10px;
  border:2px solid var(--border);background:#f8f9fa;
  font:700 10px 'Nunito',sans-serif;color:var(--muted);
  cursor:pointer;text-align:center;
  transition:all .15s ease;
}
.fb-type-btn.active{background:var(--navy);color:#fff;border-color:var(--navy);}

/* Form alanları */
.fb-field{margin-bottom:10px;}
.fb-field label{display:block;font:700 11px 'Nunito',sans-serif;color:var(--navy);margin-bottom:4px;}
.fb-field input,.fb-field textarea,.fb-field select{
  width:100%;padding:8px 11px;
  border:2px solid var(--border);border-radius:10px;
  font:600 12px 'Nunito',sans-serif;color:var(--text);
  background:#fafafa;
  transition:border-color .15s;
  resize:none;
}
.fb-field input:focus,.fb-field textarea:focus,.fb-field select:focus{
  outline:none;border-color:var(--purple);background:#fff;
}
.fb-submit{
  width:100%;padding:10px;
  background:linear-gradient(135deg,var(--purple),var(--red));
  color:#fff;border:none;border-radius:12px;
  font:800 13px 'Nunito',sans-serif;cursor:pointer;
  transition:opacity .15s ease, transform .15s ease;
  margin-top:4px;
}
.fb-submit:hover{opacity:.9;transform:translateY(-1px);}
.fb-submit:disabled{opacity:.5;cursor:not-allowed;transform:none;}

/* Başarı mesajı */
.fb-success{
  display:none;text-align:center;padding:20px 10px;
}
.fb-success-icon{font-size:2.5rem;margin-bottom:8px;}
.fb-success-title{font:800 15px 'Nunito',sans-serif;color:var(--navy);margin-bottom:4px;}
.fb-success-sub{font:600 12px 'Nunito',sans-serif;color:var(--muted);}

/* WA kutusu */
.fb-wa-box{
  background:#f0fdf4;border:1.5px solid #bbf7d0;
  border-radius:14px;padding:12px 14px;
  display:flex;align-items:center;gap:10px;
  margin-bottom:10px;
}
.fb-wa-icon{font-size:22px;flex-shrink:0;}
.fb-wa-text{font:600 11px 'Nunito',sans-serif;color:#14532d;}
.fb-wa-text strong{display:block;font-size:12px;margin-bottom:2px;}
.fb-wa-link{
  display:block;width:100%;padding:9px;text-align:center;
  background:#25d366;color:#fff;border:none;border-radius:10px;
  font:800 12px 'Nunito',sans-serif;cursor:pointer;
  text-decoration:none;
  transition:background .15s ease;
}
.fb-wa-link:hover{background:#16a34a;}
.fb-wa-placeholder{
  font:600 10px 'Nunito',sans-serif;color:#64748b;
  text-align:center;margin-top:6px;
  background:#fef9c3;border:1px solid #fde047;
  padding:4px 8px;border-radius:6px;
}

@media(max-width:400px){
  .fb-panel{width:calc(100vw - 32px);right:16px;}
  .fb-trigger{right:16px;bottom:16px;}
}