/* ===================== BioMaster · styles ===================== */
:root{
  --bg1:#0b1020; --bg2:#0f172a; --bg3:#131c33;
  --card:rgba(255,255,255,.06); --card-brd:rgba(255,255,255,.12);
  --txt:#e8eefc; --muted:#93a2c4; --muted2:#64748b;
  --brand:#22d3ee; --brand2:#a78bfa; --good:#34d399; --bad:#f87171; --warn:#fbbf24;
  --shadow:0 10px 40px rgba(0,0,0,.45);
  --radius:20px; --blur:blur(14px);
}
:root[data-theme="light"]{
  --bg1:#eef2ff; --bg2:#e6ecff; --bg3:#dfe7ff;
  --card:rgba(255,255,255,.72); --card-brd:rgba(20,30,60,.10);
  --txt:#0f1c34; --muted:#4a5a7a; --muted2:#7183a6;
  --shadow:0 10px 34px rgba(50,70,140,.18);
}
*{box-sizing:border-box;-webkit-tap-highlight-color:transparent}
html,body{margin:0;padding:0}
body{
  font-family:"Segoe UI",system-ui,-apple-system,"Noto Sans",Roboto,sans-serif;
  color:var(--txt); min-height:100vh; overflow-x:hidden;
  background:
    radial-gradient(900px 500px at 12% -8%, rgba(34,211,238,.16), transparent 60%),
    radial-gradient(800px 500px at 108% 8%, rgba(167,139,250,.18), transparent 60%),
    radial-gradient(700px 600px at 50% 120%, rgba(52,211,153,.12), transparent 60%),
    linear-gradient(160deg,var(--bg1),var(--bg2) 55%,var(--bg3));
  background-attachment:fixed;
}
::-webkit-scrollbar{width:10px;height:10px}
::-webkit-scrollbar-thumb{background:var(--card-brd);border-radius:20px}

.glass{background:var(--card);backdrop-filter:var(--blur);-webkit-backdrop-filter:var(--blur);
  border:1px solid var(--card-brd);border-radius:var(--radius);box-shadow:var(--shadow)}

/* ---- top bar ---- */
header.top{position:sticky;top:0;z-index:40;display:flex;align-items:center;gap:14px;
  padding:12px 18px;margin:12px;}
.logo{display:flex;align-items:center;gap:10px;font-weight:800;font-size:19px;letter-spacing:.3px}
.logo .dot{width:34px;height:34px;border-radius:12px;display:grid;place-items:center;font-size:20px;
  background:linear-gradient(135deg,var(--brand),var(--brand2));box-shadow:0 6px 18px rgba(34,211,238,.4)}
.spacer{flex:1}
.pill{display:flex;align-items:center;gap:6px;padding:7px 12px;border-radius:999px;font-weight:700;font-size:13px;
  background:var(--card);border:1px solid var(--card-brd)}
.pill.xp{color:var(--brand)} .pill.coin{color:var(--warn)} .pill.streak{color:#fb7185}
.icon-btn{width:40px;height:40px;border-radius:12px;display:grid;place-items:center;cursor:pointer;font-size:18px;
  background:var(--card);border:1px solid var(--card-brd);color:var(--txt);transition:.2s}
.icon-btn:hover{transform:translateY(-2px)}

/* ---- layout ---- */
.wrap{display:flex;gap:16px;padding:0 12px 90px;max-width:1240px;margin:0 auto}
nav.side{width:210px;flex:0 0 210px;padding:12px;height:max-content;position:sticky;top:78px}
nav.side .navi{display:flex;align-items:center;gap:11px;padding:11px 13px;border-radius:13px;cursor:pointer;
  color:var(--muted);font-weight:600;font-size:14px;transition:.16s;margin-bottom:3px}
nav.side .navi svg,nav.side .navi .em{width:20px;text-align:center}
nav.side .navi:hover{background:var(--card-brd);color:var(--txt)}
nav.side .navi.active{background:linear-gradient(135deg,rgba(34,211,238,.22),rgba(167,139,250,.22));color:var(--txt)}
main{flex:1;min-width:0}

/* ---- headings ---- */
h1.page{font-size:26px;margin:6px 0 2px} .sub{color:var(--muted);margin:0 0 18px;font-size:14px}
.section-t{font-size:15px;font-weight:800;letter-spacing:.4px;text-transform:uppercase;color:var(--muted);margin:26px 4px 12px}

/* ---- dashboard grid ---- */
.stat-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(158px,1fr));gap:12px}
.stat{padding:16px;position:relative;overflow:hidden}
.stat .k{font-size:12px;color:var(--muted);font-weight:700;text-transform:uppercase;letter-spacing:.5px}
.stat .v{font-size:27px;font-weight:800;margin-top:6px}
.stat .ic{position:absolute;right:12px;top:12px;font-size:20px;opacity:.85}
.bar{height:9px;border-radius:99px;background:var(--card-brd);overflow:hidden;margin-top:10px}
.bar>i{display:block;height:100%;border-radius:99px;background:linear-gradient(90deg,var(--brand),var(--brand2));transition:width .8s cubic-bezier(.2,.8,.2,1)}

.two-col{display:grid;grid-template-columns:1.3fr 1fr;gap:14px;margin-top:14px}
@media(max-width:900px){.two-col{grid-template-columns:1fr}}

.list-row{display:flex;align-items:center;gap:10px;padding:10px 6px;border-bottom:1px solid var(--card-brd);font-size:14px}
.list-row:last-child{border-bottom:0}
.tag{font-size:11px;font-weight:800;padding:3px 9px;border-radius:99px}
.tag.weak{background:rgba(248,113,113,.16);color:#fca5a5} .tag.strong{background:rgba(52,211,153,.16);color:#6ee7b7}
.tag.due{background:rgba(251,191,36,.16);color:#fcd34d} .tag.new{background:rgba(34,211,238,.16);color:#67e8f9}

/* ---- chapter cards ---- */
.chap-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(220px,1fr));gap:14px}
.chap{padding:18px;cursor:pointer;transition:.2s;position:relative;overflow:hidden}
.chap:hover{transform:translateY(-4px)}
.chap .emj{font-size:30px}
.chap h3{margin:10px 0 4px;font-size:16px}
.chap .meta{font-size:12px;color:var(--muted)}
.chap .ring{position:absolute;right:14px;top:14px}

/* ---- buttons ---- */
.btn{border:none;cursor:pointer;font-weight:700;font-size:14px;padding:11px 18px;border-radius:13px;color:#04121f;
  background:linear-gradient(135deg,var(--brand),var(--brand2));transition:.16s;display:inline-flex;align-items:center;gap:8px}
.btn:hover{transform:translateY(-2px);filter:brightness(1.06)}
.btn.ghost{background:var(--card);border:1px solid var(--card-brd);color:var(--txt)}
.btn.sm{padding:8px 13px;font-size:13px}
.btn:disabled{opacity:.5;cursor:not-allowed;transform:none}
.chips{display:flex;flex-wrap:wrap;gap:8px}
.chip{padding:8px 14px;border-radius:999px;background:var(--card);border:1px solid var(--card-brd);cursor:pointer;font-weight:600;font-size:13px;transition:.15s;color:var(--txt)}
.chip:hover{border-color:var(--brand)} .chip.on{background:linear-gradient(135deg,var(--brand),var(--brand2));color:#04121f;border-color:transparent}

/* ---- mode gallery ---- */
.mode-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(150px,1fr));gap:12px}
.mode{padding:16px;cursor:pointer;text-align:left;transition:.18s}
.mode:hover{transform:translateY(-4px)}
.mode .em{font-size:26px} .mode h4{margin:8px 0 3px;font-size:15px} .mode p{margin:0;font-size:12px;color:var(--muted)}

/* ---- flashcard ---- */
.stage{max-width:640px;margin:10px auto}
.flash{perspective:1600px;height:340px;cursor:pointer;margin-bottom:16px}
.flash-in{position:relative;width:100%;height:100%;transition:transform .6s cubic-bezier(.2,.8,.2,1);transform-style:preserve-3d}
.flash.flip .flash-in{transform:rotateY(180deg)}
.flash-face{position:absolute;inset:0;backface-visibility:hidden;border-radius:var(--radius);padding:26px;display:flex;flex-direction:column;justify-content:center;align-items:center;text-align:center}
.flash-back{transform:rotateY(180deg)}
.flash-face .q{font-size:22px;font-weight:800;line-height:1.35}
.flash-face .a{font-size:17px;line-height:1.55}
.flash-face .lbl{position:absolute;top:16px;left:18px;font-size:11px;letter-spacing:1px;color:var(--muted);font-weight:800;text-transform:uppercase}
.flash-face .hint{position:absolute;bottom:14px;font-size:12px;color:var(--muted2)}

/* ---- quiz ---- */
.q-card{padding:24px;max-width:720px;margin:10px auto}
.q-head{display:flex;justify-content:space-between;align-items:center;color:var(--muted);font-size:13px;font-weight:700;margin-bottom:14px}
.q-text{font-size:20px;font-weight:800;line-height:1.4;margin-bottom:18px}
.opt{display:flex;align-items:center;gap:12px;padding:14px 16px;border-radius:14px;margin-bottom:10px;cursor:pointer;
  background:var(--card);border:1.5px solid var(--card-brd);transition:.14s;font-size:15px;font-weight:600}
.opt:hover{border-color:var(--brand);transform:translateX(3px)}
.opt .kx{width:26px;height:26px;border-radius:8px;display:grid;place-items:center;font-size:13px;font-weight:800;background:var(--card-brd);flex:0 0 26px}
.opt.correct{border-color:var(--good);background:rgba(52,211,153,.14)} .opt.correct .kx{background:var(--good);color:#042}
.opt.wrong{border-color:var(--bad);background:rgba(248,113,113,.14)} .opt.wrong .kx{background:var(--bad);color:#400}
.opt.disabled{pointer-events:none}
.explain{margin-top:6px;padding:13px 15px;border-radius:13px;background:rgba(34,211,238,.10);border:1px solid rgba(34,211,238,.25);font-size:14px;line-height:1.5}
.explain b{color:var(--brand)}
.blank-in{width:100%;padding:14px 16px;border-radius:13px;font-size:16px;font-weight:600;background:var(--card);border:1.5px solid var(--card-brd);color:var(--txt);outline:none}
.blank-in:focus{border-color:var(--brand)}
.timer{font-variant-numeric:tabular-nums}
.progress-top{height:6px;border-radius:99px;background:var(--card-brd);overflow:hidden;margin-bottom:16px}
.progress-top>i{display:block;height:100%;background:linear-gradient(90deg,var(--brand),var(--brand2));transition:width .3s}

/* match */
.match-wrap{display:grid;grid-template-columns:1fr 1fr;gap:14px;max-width:720px;margin:0 auto}
.match-col{display:flex;flex-direction:column;gap:10px}
.match-item{padding:13px 15px;border-radius:13px;background:var(--card);border:1.5px solid var(--card-brd);cursor:pointer;font-weight:600;font-size:14px;transition:.14s}
.match-item:hover{border-color:var(--brand)}
.match-item.sel{border-color:var(--brand2);background:rgba(167,139,250,.16)}
.match-item.done{opacity:.45;pointer-events:none;border-color:var(--good)}

/* result */
.result{text-align:center;max-width:560px;margin:20px auto;padding:34px}
.result .big{font-size:60px}
.result .score{font-size:42px;font-weight:900;margin:6px 0}
.donut{--p:0;width:150px;height:150px;border-radius:50%;margin:14px auto;display:grid;place-items:center;
  background:conic-gradient(var(--brand) calc(var(--p)*1%), var(--card-brd) 0)}
.donut span{width:118px;height:118px;border-radius:50%;background:var(--bg2);display:grid;place-items:center;font-size:28px;font-weight:900}

/* toast + confetti + modal */
#toast{position:fixed;left:50%;bottom:26px;transform:translateX(-50%) translateY(30px);z-index:200;opacity:0;
  padding:12px 20px;border-radius:14px;font-weight:700;transition:.3s;pointer-events:none;box-shadow:var(--shadow)}
#toast.show{opacity:1;transform:translateX(-50%) translateY(0)}
#confetti{position:fixed;inset:0;pointer-events:none;z-index:150}
.modal-bg{position:fixed;inset:0;background:rgba(3,8,20,.6);backdrop-filter:blur(4px);z-index:100;display:none;place-items:center;padding:16px}
.modal-bg.on{display:grid}
.modal{max-width:560px;width:100%;padding:22px;max-height:86vh;overflow:auto}

/* search */
.search-box{display:flex;align-items:center;gap:10px;padding:12px 16px;margin-bottom:14px}
.search-box input{flex:1;background:none;border:none;outline:none;color:var(--txt);font-size:16px}
.sr{padding:13px 15px;border-radius:13px;background:var(--card);border:1px solid var(--card-brd);margin-bottom:9px}
.sr h4{margin:0 0 4px;font-size:15px} .sr p{margin:0;font-size:13px;color:var(--muted);line-height:1.5}

/* bottom nav (mobile) */
.botnav{display:none}
@media(max-width:820px){
  nav.side{display:none}
  .wrap{padding-bottom:74px}
  .two-col{grid-template-columns:1fr}
  .botnav{display:flex;position:fixed;bottom:0;left:0;right:0;z-index:60;justify-content:space-around;
    padding:8px 4px 10px;margin:0;border-radius:20px 20px 0 0}
  .botnav .b{display:flex;flex-direction:column;align-items:center;gap:2px;font-size:11px;color:var(--muted);cursor:pointer;padding:4px 10px;font-weight:600}
  .botnav .b.active{color:var(--brand)} .botnav .b .e{font-size:19px}
  header.top{margin:8px} .wrap{padding-left:8px;padding-right:8px}
  .flash{height:300px}
}
.fade{animation:fade .35s ease}
@keyframes fade{from{opacity:0;transform:translateY(8px)}to{opacity:1;transform:none}}
.pop{animation:pop .3s cubic-bezier(.2,1.6,.4,1)}
@keyframes pop{from{transform:scale(.9);opacity:0}to{transform:scale(1);opacity:1}}
.mnem{margin-top:12px;padding:11px 14px;border-radius:12px;background:rgba(251,191,36,.12);border:1px solid rgba(251,191,36,.3);font-size:13px}
.mnem b{color:var(--warn)}
.facts{list-style:none;padding:0;margin:14px 0 0;text-align:left;max-width:520px}
.facts li{padding:8px 0 8px 26px;position:relative;font-size:14px;line-height:1.5;border-bottom:1px dashed var(--card-brd)}
.facts li:before{content:"▸";position:absolute;left:6px;color:var(--brand)}
.kbd{font-size:11px;padding:2px 7px;border-radius:6px;background:var(--card-brd);font-weight:700}