:root{
  --bg:#f6f3ea; --paper:#fffdf7; --ink:#1d2a4d; --ink2:#55607d; --line:#e4dfcf;
  --accent:#ffd34d; --accent-ink:#5a4300; --good:#1f9d6b; --good-bg:#e3f6ed;
  --bad:#d6455d; --bad-bg:#fde8ec; --near:#e08a1e; --near-bg:#fff1dc;
  --blue:#3a63d8; --shadow:0 2px 0 #e4dfcf, 0 8px 24px rgba(29,42,77,.06);
  --r:18px;
}
@media (prefers-color-scheme: dark){
  :root:not([data-theme="light"]){
    --bg:#121726; --paper:#1b2236; --ink:#eef1f8; --ink2:#a6afc6; --line:#2c3550;
    --accent:#ffd34d; --accent-ink:#2a2000; --good:#4fd39e; --good-bg:#16352b;
    --bad:#ff7d92; --bad-bg:#3a1d26; --near:#ffb35c; --near-bg:#3a2a14; --blue:#7f9bff;
    --shadow:0 2px 0 #0c101c, 0 8px 24px rgba(0,0,0,.25);
  }
}
*{box-sizing:border-box}
html,body{margin:0;background:var(--bg);color:var(--ink);
  font-family:Pretendard,-apple-system,BlinkMacSystemFont,"Apple SD Gothic Neo","Noto Sans KR",sans-serif;
  -webkit-text-size-adjust:100%; -webkit-tap-highlight-color:transparent}
body{min-height:100vh;min-height:100dvh}
button{font:inherit;color:inherit;cursor:pointer}
.topbar{position:sticky;top:0;z-index:5;display:flex;align-items:center;justify-content:space-between;
  padding:calc(env(safe-area-inset-top) + 8px) 12px 8px;background:#1d2a4d;color:#fff}
.brand{font-weight:800;letter-spacing:-.02em;font-size:17px}
.brand small{font-weight:500;opacity:.7;margin-left:6px}
.icon-btn{background:rgba(255,255,255,.12);border:0;border-radius:12px;width:40px;height:40px;font-size:18px}
main{max-width:640px;margin:0 auto;padding:16px 16px calc(env(safe-area-inset-bottom) + 40px)}
h1{font-size:24px;letter-spacing:-.03em;margin:8px 0 4px}
h2{font-size:18px;letter-spacing:-.02em;margin:24px 0 10px}
.muted{color:var(--ink2)}
.card{background:var(--paper);border:1.5px solid var(--line);border-radius:var(--r);padding:18px;box-shadow:var(--shadow)}
.stack>*+*{margin-top:12px}
.row{display:flex;gap:10px;align-items:center}
.grow{flex:1}
.btn{display:flex;align-items:center;justify-content:center;gap:8px;width:100%;min-height:52px;
  border-radius:14px;border:1.5px solid var(--line);background:var(--paper);font-weight:700;font-size:16px;
  box-shadow:0 2px 0 var(--line);transition:transform .06s}
.btn:active{transform:translateY(2px);box-shadow:none}
.btn.primary{background:var(--accent);border-color:#e9b92a;color:var(--accent-ink);box-shadow:0 3px 0 #d9a91a}
.btn.ink{background:#1d2a4d;color:#fff;border-color:#1d2a4d;box-shadow:0 3px 0 #0d1530}
.btn.ghost{background:transparent;box-shadow:none}
.btn[disabled]{opacity:.45;pointer-events:none}
.btn small{font-weight:500;opacity:.75}

/* login */
.pin-wrap{max-width:320px;margin:40px auto 0;text-align:center}
.pin-dots{display:flex;justify-content:center;gap:14px;margin:22px 0}
.pin-dots i{width:16px;height:16px;border-radius:50%;border:2px solid var(--ink);display:block}
.pin-dots i.on{background:var(--ink)}
.pin-pad{display:grid;grid-template-columns:repeat(3,1fr);gap:10px}
.pin-pad button{height:62px;border-radius:16px;border:1.5px solid var(--line);background:var(--paper);font-size:24px;font-weight:700;box-shadow:0 2px 0 var(--line)}
.shake{animation:shake .4s}
@keyframes shake{20%,60%{transform:translateX(-8px)}40%,80%{transform:translateX(8px)}}

/* home */
.week-switch{display:flex;gap:8px;overflow-x:auto;padding-bottom:4px;margin:0 -16px;padding-left:16px;padding-right:16px;scrollbar-width:none}
.chip{flex:none;border:1.5px solid var(--line);background:var(--paper);border-radius:999px;padding:8px 14px;font-weight:700;font-size:14px;white-space:nowrap}
.chip.on{background:var(--ink);color:var(--bg);border-color:var(--ink)}
.hero{position:relative;overflow:hidden}
.hero .dday{position:absolute;right:16px;top:16px;background:var(--accent);color:var(--accent-ink);font-weight:800;border-radius:10px;padding:4px 10px;font-size:14px}
.hero h1{padding-right:70px}
.meter{height:12px;border-radius:99px;background:var(--line);overflow:hidden;margin-top:14px}
.meter>b{display:block;height:100%;background:linear-gradient(90deg,var(--good),#5ad0a0);border-radius:99px;transition:width .6s}
.mrow{display:flex;justify-content:space-between;font-size:13px;margin-top:6px}
.menu{display:grid;grid-template-columns:1fr 1fr;gap:10px}
.menu .btn{flex-direction:column;min-height:96px;gap:4px;font-size:16px;text-align:center;padding:10px}
.menu .btn .em{font-size:26px;line-height:1}
.menu .btn.wide{grid-column:1/-1;flex-direction:row;min-height:64px}
.badge{display:inline-block;min-width:22px;padding:1px 7px;border-radius:99px;background:var(--bad);color:#fff;font-size:12px;font-weight:800}

/* quiz */
.qhead{display:flex;align-items:center;gap:10px;font-size:14px;font-weight:700}
.qbar{flex:1;height:8px;border-radius:99px;background:var(--line);overflow:hidden}
.qbar>b{display:block;height:100%;background:var(--blue);transition:width .3s}
.qcard{text-align:center;padding:28px 18px 22px}
.qmode{display:inline-block;font-size:12px;font-weight:800;border-radius:8px;padding:3px 8px;background:var(--line);color:var(--ink2)}
.qmeaning{font-size:30px;font-weight:800;letter-spacing:-.03em;margin:14px 0 6px;word-break:keep-all}
.qhint{font-family:ui-monospace,Menlo,monospace;font-size:20px;letter-spacing:.12em;color:var(--blue);min-height:28px;word-break:break-all}
.qex{font-size:14px;color:var(--ink2);margin-top:8px;line-height:1.5}
.answer-in{width:100%;font-size:24px;font-weight:700;text-align:center;padding:14px 12px;border-radius:14px;
  border:2px solid var(--ink);background:var(--paper);color:var(--ink);outline:none;font-family:inherit;letter-spacing:.01em}
.answer-in:focus{box-shadow:0 0 0 4px rgba(58,99,216,.2)}
.answer-in.good{border-color:var(--good);background:var(--good-bg)}
.answer-in.bad{border-color:var(--bad);background:var(--bad-bg)}
.fb{border-radius:16px;padding:16px;text-align:center;animation:pop .25s ease-out;overflow-wrap:anywhere}
.fb.copied{background:var(--good-bg);color:var(--good)}
.fb.good{background:var(--good-bg);color:var(--good)}
.fb.bad{background:var(--bad-bg);color:var(--bad)}
.fb.near{background:var(--near-bg);color:var(--near)}
.fb .big{font-size:20px;font-weight:800}
.fb .ans{font-size:26px;font-weight:800;color:var(--ink);margin-top:8px;letter-spacing:.02em}
.fb .ans .x{color:var(--bad);text-decoration:underline wavy;text-underline-offset:5px}
.fb .yours{font-size:14px;color:var(--ink2);margin-top:4px}
.fb .yours s{color:var(--bad)}
@keyframes pop{0%{transform:scale(.92);opacity:0}100%{transform:scale(1);opacity:1}}
.streak{display:inline-block;margin-left:6px;color:var(--near)}
.tts{border:0;background:transparent;font-size:22px;vertical-align:middle;padding:0 4px}

/* study */
.flash{min-height:300px;display:flex;flex-direction:column;justify-content:center;text-align:center;cursor:pointer;user-select:none}
.flash .front{font-size:28px;font-weight:800;word-break:keep-all}
.flash .back{margin-top:18px}
.flash .word{font-size:30px;font-weight:800;color:var(--blue);letter-spacing:.01em}
.flash .tag{font-size:13px;color:var(--ink2);margin-top:8px}
.flash .ex{font-size:15px;line-height:1.55;margin-top:12px;color:var(--ink2)}
.flash .ex b{color:var(--ink)}
.tapme{font-size:13px;color:var(--ink2);margin-top:16px}

/* result */
.score{font-size:64px;font-weight:900;letter-spacing:-.04em;line-height:1;text-align:center;margin:10px 0 4px}
.score small{font-size:24px;color:var(--ink2);font-weight:700}
.verdict{text-align:center;font-size:19px;font-weight:800;margin:6px 0 4px}
.wlist{list-style:none;padding:0;margin:0}
.wlist li{display:flex;justify-content:space-between;gap:10px;padding:11px 2px;border-bottom:1px dashed var(--line);font-size:15px}
.wlist li:last-child{border-bottom:0}
.wlist .w{font-weight:800}
.wlist .m{color:var(--ink2);text-align:right}
.wlist .g{font-size:12px;color:var(--bad);display:block}

/* stats */
.kpis{display:grid;grid-template-columns:repeat(3,1fr);gap:10px}
.kpi{text-align:center;padding:14px 6px}
.kpi b{display:block;font-size:24px;font-weight:900;letter-spacing:-.03em}
.kpi span{font-size:12px;color:var(--ink2)}
table.att{width:100%;border-collapse:collapse;font-size:14px}
table.att th{font-size:12px;color:var(--ink2);text-align:left;font-weight:700;padding:6px 4px;border-bottom:1.5px solid var(--line)}
table.att td{padding:9px 4px;border-bottom:1px dashed var(--line);vertical-align:middle}
.pbar{height:8px;border-radius:99px;background:var(--line);overflow:hidden;min-width:60px}
.pbar>b{display:block;height:100%;background:var(--good)}
.mgrid{display:grid;grid-template-columns:repeat(auto-fill,minmax(150px,1fr));gap:8px}
.mcell{border-radius:12px;padding:9px 10px;font-size:13px;border:1.5px solid var(--line);background:var(--paper)}
.mcell b{display:block;font-size:14px;margin-bottom:2px;word-break:break-word}
.mcell.ok{border-color:var(--good);background:var(--good-bg)}
.mcell.ng{border-color:var(--bad);background:var(--bad-bg)}
.legend{display:flex;gap:12px;font-size:12px;color:var(--ink2);margin-bottom:8px;flex-wrap:wrap}
.legend i{display:inline-block;width:10px;height:10px;border-radius:3px;margin-right:4px;vertical-align:-1px}
svg.trend{width:100%;height:120px;display:block}
.empty{text-align:center;padding:30px 10px;color:var(--ink2)}
.seg{display:flex;background:var(--line);border-radius:12px;padding:3px;gap:3px}
.seg button{flex:1;border:0;background:transparent;border-radius:10px;padding:8px 4px;font-weight:700;font-size:14px;color:var(--ink2)}
.seg button.on{background:var(--paper);color:var(--ink);box-shadow:0 1px 2px rgba(0,0,0,.08)}

/* confetti */
#confetti{position:fixed;inset:0;pointer-events:none;overflow:hidden;z-index:50}
#confetti i{position:absolute;top:-12px;width:9px;height:14px;border-radius:2px;animation:fall linear forwards}
@keyframes fall{to{transform:translateY(110vh) rotate(720deg)}}
@media (prefers-reduced-motion: reduce){#confetti{display:none}.fb,.shake{animation:none}}