/* Layout: one centred reading column; cards are the only raised surfaces, everything else sits flat on the page. */
:root{
  --bg:#f3f5f4;--surface:#ffffff;--surface-2:#e9eeec;--text:#13201d;--muted:#5a6b66;--line:#d9e1de;
  --brand:#0e7c6b;--brand-ink:#ffffff;--brand-soft:#d6efe9;
  --exam:#8a5a00;--exam-soft:#fbefd6;
  --ok:#137a3a;--ok-soft:#dcf3e3;--no:#b42318;--no-soft:#fde4e1;--info:#1d4ed8;--info-soft:#e0e8fd;
  --again:#b42318;--hard:#9a5b00;--good:#0e7c6b;--easy:#1d4ed8;
  --shadow:0 1px 2px rgba(16,32,28,.05),0 6px 20px rgba(16,32,28,.06);
  --r:18px;color-scheme:light;
}
:root[data-theme="dark"]{
  --bg:#0c1312;--surface:#141d1b;--surface-2:#1c2725;--text:#e4eeeb;--muted:#93a6a0;--line:#26332f;
  --brand:#34d3b4;--brand-ink:#04211b;--brand-soft:#123a33;
  --exam:#f0bd5c;--exam-soft:#3a2c10;
  --ok:#4ade80;--ok-soft:#123222;--no:#f87171;--no-soft:#3b1716;--info:#7aa2ff;--info-soft:#18233f;
  --again:#f87171;--hard:#f0bd5c;--good:#34d3b4;--easy:#7aa2ff;
  --shadow:0 1px 2px rgba(0,0,0,.4),0 8px 24px rgba(0,0,0,.28);color-scheme:dark;
}
@media (prefers-color-scheme:dark){:root:not([data-theme="light"]){
  --bg:#0c1312;--surface:#141d1b;--surface-2:#1c2725;--text:#e4eeeb;--muted:#93a6a0;--line:#26332f;
  --brand:#34d3b4;--brand-ink:#04211b;--brand-soft:#123a33;
  --exam:#f0bd5c;--exam-soft:#3a2c10;
  --ok:#4ade80;--ok-soft:#123222;--no:#f87171;--no-soft:#3b1716;--info:#7aa2ff;--info-soft:#18233f;
  --again:#f87171;--hard:#f0bd5c;--good:#34d3b4;--easy:#7aa2ff;
  --shadow:0 1px 2px rgba(0,0,0,.4),0 8px 24px rgba(0,0,0,.28);color-scheme:dark;
}}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;padding-top:env(safe-area-inset-top,0px);padding-bottom:env(safe-area-inset-bottom,0px)}
body{margin:0;background:var(--bg);color:var(--text);font:16px/1.6 system-ui,-apple-system,"Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif;min-height:100%;font-variant-numeric:tabular-nums}
body::before{content:"";position:fixed;inset:0 0 auto;height:env(safe-area-inset-top,0px);z-index:10;background:var(--bg)}
a{color:var(--brand)}
button,input,select,textarea{font:inherit;color:inherit}
:focus-visible{outline:3px solid var(--brand);outline-offset:2px;border-radius:10px}
h1,h2,h3{text-wrap:balance;letter-spacing:-.02em}
h1{font-size:clamp(26px,6vw,34px);line-height:1.15;margin:6px 0 8px;font-weight:750}
h2{font-size:19px;margin:0 0 4px;font-weight:700}
h3{font-size:17px;margin:0 0 2px;font-weight:700}
.muted{color:var(--muted)}
.small{font-size:14px}
p{margin:0 0 8px}

/* header */
.top{position:sticky;top:env(safe-area-inset-top,0px);z-index:5;display:flex;align-items:center;justify-content:space-between;gap:12px;
  padding-block:10px;padding-left:max(16px,env(safe-area-inset-left,0px));padding-right:max(16px,env(safe-area-inset-right,0px));
  background:color-mix(in srgb,var(--bg) 88%,transparent);backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);border-bottom:1px solid var(--line)}
.brand{display:flex;align-items:center;gap:10px;font-weight:750;color:var(--text);text-decoration:none;letter-spacing:-.01em}
.top nav{display:flex;gap:2px}
.top nav a{padding:8px 12px;border-radius:10px;text-decoration:none;color:var(--muted);font-weight:650;font-size:15px}
.top nav a:hover,.top nav a.on{background:var(--surface-2);color:var(--text)}
main{max-width:760px;margin:0 auto;padding-block:18px 56px;padding-left:max(16px,env(safe-area-inset-left,0px));padding-right:max(16px,env(safe-area-inset-right,0px));outline:none;display:flex;flex-direction:column;gap:14px}
main>*{margin-top:0;margin-bottom:0}

/* home */
.hero{padding:8px 0 2px}
.eyebrow{font-size:12px;font-weight:750;letter-spacing:.12em;text-transform:uppercase;color:var(--brand);margin:0}
.stats{display:grid;grid-template-columns:repeat(4,1fr);gap:8px;margin-top:14px}
.stat{background:var(--surface);border:1px solid var(--line);border-radius:14px;padding:10px 8px;text-align:center}
.stat b{display:block;font-size:22px;line-height:1.2}
.stat span{font-size:12px;color:var(--muted)}
.seg{display:grid;grid-template-columns:repeat(3,1fr);gap:4px;padding:4px;background:var(--surface-2);border-radius:14px}
.seg button{appearance:none;border:0;background:transparent;padding:10px;border-radius:11px;font-weight:700;color:var(--muted);cursor:pointer;min-height:44px}
.seg button.on{background:var(--surface);color:var(--text);box-shadow:var(--shadow)}
.seg small{font-weight:600;opacity:.7}
.mix{background:var(--brand-soft);border-radius:var(--r);padding:18px;display:flex;flex-direction:column;gap:12px}
.mix .bar{background:color-mix(in srgb,var(--brand) 18%,transparent)}
.section-title{margin-top:8px}
.deck{background:var(--surface);border:1px solid var(--line);border-radius:var(--r);padding:16px;display:flex;flex-direction:column;gap:12px}
.deck-head{display:flex;justify-content:space-between;align-items:flex-start;gap:12px}
.deck-head>div{min-width:0}
.deck-head p{margin:0}
.count{font-size:14px;color:var(--muted);white-space:nowrap}
.count b{font-size:20px;color:var(--text)}
.bar{height:8px;background:var(--surface-2);border-radius:99px;overflow:hidden;display:flex}
.bar i{display:block;height:100%;transition:width .3s}
.bar .m{background:var(--brand)}.bar .s{background:color-mix(in srgb,var(--brand) 35%,transparent)}
.row{display:flex;flex-wrap:wrap;gap:8px}
.row.center{justify-content:center}

/* buttons */
.btn{appearance:none;border:1px solid var(--line);background:var(--surface);border-radius:12px;padding:10px 16px;font-weight:650;cursor:pointer;
  text-decoration:none;color:var(--text);display:inline-flex;align-items:center;justify-content:center;gap:6px;min-height:44px;transition:transform .08s,background .15s}
.btn:hover{background:var(--surface-2)}
.btn:active{transform:scale(.98)}
.btn.primary{background:var(--brand);border-color:var(--brand);color:var(--brand-ink)}
.btn.primary:hover{filter:brightness(1.06)}
.btn.ghost{border-color:transparent;background:transparent;color:var(--brand)}
.btn.block{width:100%}
.btn[disabled]{opacity:.5;cursor:not-allowed}

/* chips & badges */
.meta-line{display:flex;flex-wrap:wrap;gap:6px}
.chip{display:inline-block;font-size:12px;font-weight:700;color:var(--brand);background:var(--brand-soft);border-radius:99px;padding:3px 10px;line-height:1.5}
.chip.exam{color:var(--exam);background:var(--exam-soft)}
.chip.ghost{background:transparent;color:var(--muted);border:1px solid var(--line)}
.badge{display:inline-block;font-size:12px;font-weight:700;border-radius:6px;padding:1px 8px}
.badge.ok{color:var(--ok);background:var(--ok-soft)}
.badge.warn{color:var(--exam);background:var(--exam-soft)}
.badge.info{color:var(--info);background:var(--info-soft)}
.mark-note{font-size:13px;color:var(--muted)}

/* study card */
.progress{display:flex;align-items:center;gap:10px;font-size:14px;color:var(--muted)}
.progress .bar{flex:1}
.card{background:var(--surface);border:1px solid var(--line);border-radius:22px;box-shadow:var(--shadow);padding:20px;display:flex;flex-direction:column;gap:14px}
.card .q{font-size:clamp(18px,4.4vw,21px);font-weight:700;line-height:1.45;letter-spacing:-.01em}
.card .hint{font-size:13px;color:var(--muted);margin-top:-8px}
.qbody{display:flex;flex-direction:column;gap:12px}
.opts{display:flex;flex-direction:column;gap:8px}
.opts.tf{flex-direction:row}
.opts.tf .opt{flex:1;justify-content:center}
.opt{appearance:none;display:flex;align-items:flex-start;gap:12px;text-align:left;width:100%;padding:12px 14px;border:1.5px solid var(--line);border-radius:14px;background:var(--surface);cursor:pointer;min-height:48px;line-height:1.45;transition:border-color .15s,background .15s}
.opt:hover:not([disabled]){border-color:var(--brand);background:var(--brand-soft)}
.opt[disabled]{cursor:default}
.letter{flex:none;width:26px;height:26px;border-radius:8px;background:var(--surface-2);display:grid;place-items:center;font-size:13px;font-weight:800;color:var(--muted)}
.opt.right{border-color:var(--ok);background:var(--ok-soft)}
.opt.right .letter{background:var(--ok);color:var(--surface)}
.opt.wrong{border-color:var(--no);background:var(--no-soft)}
.opt.wrong .letter{background:var(--no);color:var(--surface)}
.verdict{font-weight:750;border-radius:12px;padding:10px 14px}
.verdict.ok{color:var(--ok);background:var(--ok-soft)}
.verdict.no{color:var(--no);background:var(--no-soft)}
.ans{border-top:1px dashed var(--line);padding-top:12px;animation:in .22s ease-out}
.fill-ans{font-size:18px}
.md ul,.md ol{padding-left:22px;margin:6px 0}
.md li{margin:5px 0}
.md p{margin:8px 0}
.md h4{margin:14px 0 4px;font-size:15px;color:var(--brand)}
.after{display:flex;flex-direction:column;gap:10px}
.after:empty{display:none}
.after>p{margin:0}
.grades{display:grid;grid-template-columns:repeat(4,1fr);gap:8px}
.grades .btn{flex-direction:column;gap:0;padding:8px 4px;font-size:14px}
.grades .btn small{font-weight:500;color:var(--muted);font-size:12px}
.g0{border-color:var(--again)!important;color:var(--again)!important}
.g1{border-color:var(--hard)!important;color:var(--hard)!important}
.g2{border-color:var(--good)!important;color:var(--good)!important}
.g3{border-color:var(--easy)!important;color:var(--easy)!important}
.source{margin:0;font-size:13px;background:var(--surface-2);border-radius:12px;padding:10px 12px;display:grid;gap:4px}
.source div{display:grid;grid-template-columns:110px 1fr;gap:8px}
.source dt{color:var(--muted);font-weight:600}
.source dd{margin:0;min-width:0;overflow-wrap:anywhere}
.kbd{font-size:12px;color:var(--muted);text-align:center}
@media (hover:none){.kbd{display:none}}

/* browse */
.search{width:100%;padding:12px 14px;border:1px solid var(--line);background:var(--surface);border-radius:12px;min-height:46px}
details.item{background:var(--surface);border:1px solid var(--line);border-radius:14px;overflow:hidden}
details.item+details.item{margin-top:8px}
details.item summary{cursor:pointer;padding:14px 16px;font-weight:650;list-style:none;display:flex;gap:12px;align-items:flex-start}
details.item summary::-webkit-details-marker{display:none}
.qno{flex:none;font-size:12px;font-weight:800;color:var(--exam);background:var(--exam-soft);border-radius:8px;padding:2px 7px;margin-top:2px}
.sum-meta{display:block;font-weight:500;color:var(--muted);font-size:12px;margin-top:4px}
details.item .md{padding:4px 16px 16px;border-top:1px solid var(--line);display:flex;flex-direction:column;gap:8px}
.opt-list li.right{color:var(--ok);font-weight:700}

/* exam & panels */
textarea{width:100%;min-height:130px;padding:12px;border:1px solid var(--line);border-radius:12px;background:var(--surface-2);resize:vertical}
.score{display:grid;grid-template-columns:repeat(6,1fr);gap:6px}
.big{font-size:46px;font-weight:800;letter-spacing:-.03em;margin:4px 0}
.panel{background:var(--surface);border:1px solid var(--line);border-radius:var(--r);padding:18px;display:flex;flex-direction:column;gap:10px}
.panel p{margin:0}
.history{list-style:none;padding:0;margin:0;display:grid;gap:6px}
.history li{display:grid;grid-template-columns:1fr auto auto;gap:12px;font-size:14px}
.legend{margin:0;padding-left:0;list-style:none;display:grid;gap:8px;font-size:14px}
.field{display:flex;justify-content:space-between;align-items:center;gap:12px}
select{padding:8px 10px;border-radius:10px;border:1px solid var(--line);background:var(--surface-2);min-height:40px}
/* vize provası */
.prova{background:var(--exam-soft);border-radius:var(--r);padding:18px;display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:12px}
.prova>div{flex:1 1 260px;min-width:0}
.prova h2{color:var(--exam)}
.prova p{margin:0}
.stack{display:flex;flex-direction:column;gap:14px}
.seg.two{grid-template-columns:repeat(2,1fr)}
.mockbar{display:flex;align-items:center;gap:12px;flex-wrap:wrap}
.mockbar .btn{margin-left:auto}
.timer{font-size:20px;font-weight:800;letter-spacing:-.01em}
.timer.low{color:var(--no)}
.qnav{display:grid;grid-template-columns:repeat(auto-fill,minmax(38px,1fr));gap:6px}
.qnav button{appearance:none;min-height:38px;border:1px solid var(--line);border-radius:10px;background:var(--surface);font-size:14px;font-weight:700;color:var(--muted);cursor:pointer;padding:0}
.qnav button.done{background:var(--brand-soft);border-color:transparent;color:var(--brand)}
.qnav button.on{border:2px solid var(--brand);color:var(--text)}
.opt.sel{border-color:var(--brand);background:var(--brand-soft)}
.opt.sel .letter{background:var(--brand);color:var(--brand-ink)}
.row.split{justify-content:space-between}
.mine{background:var(--surface-2);border-radius:12px;padding:10px 14px}
.mine p,.mine-text{white-space:pre-wrap;overflow-wrap:anywhere;margin:4px 0 0}
.breakdown{display:grid;gap:10px}
.brow{display:grid;grid-template-columns:1fr auto;gap:4px 12px;font-size:14px}
.brow .bar{grid-column:1/-1}
.qno.full{color:var(--ok);background:var(--ok-soft)}
.qno.part{color:var(--exam);background:var(--exam-soft)}
.qno.zero{color:var(--no);background:var(--no-soft)}
.empty{text-align:center;align-items:center;padding:36px 16px}
#toast{position:fixed;left:50%;bottom:calc(20px + env(safe-area-inset-bottom,0px));transform:translateX(-50%) translateY(20px);background:var(--text);color:var(--bg);
  padding:10px 16px;border-radius:12px;font-size:14px;opacity:0;pointer-events:none;transition:.2s;max-width:calc(100% - 32px);z-index:20}
#toast.on{opacity:1;transform:translateX(-50%)}
mark{background:color-mix(in srgb,var(--hard) 30%,transparent);color:inherit;border-radius:3px}
@keyframes in{from{opacity:0;transform:translateY(6px)}to{opacity:1;transform:none}}
@media (max-width:460px){.stats{grid-template-columns:repeat(2,1fr)}.card{padding:16px}.score{grid-template-columns:repeat(3,1fr)}.source div{grid-template-columns:1fr;gap:0}.qnav{grid-template-columns:repeat(auto-fill,minmax(32px,1fr));gap:4px}.qnav button{min-height:32px;font-size:13px}}
@media (prefers-reduced-motion:reduce){*{animation:none!important;transition:none!important}}