:root{color-scheme:light;--bg: #f6f5f1;--surface: #fcfcfb;--surface-2: #f0efeb;--ink: #0b0b0b;--ink-2: #52514e;--muted: #898781;--line: #e1e0d9;--axis: #c3c2b7;--accent: #2a78d6;--accent-ink: #ffffff;--accent-soft: #cde2fb;--accent-soft-2: #e7f0fc;--good: #0ca30c;--good-ink: #006300;--good-soft: #e3f4e3;--bad: #d03b3b;--bad-soft: #fbe6e6;--warn: #fab219;--warn-soft: #fff3d6;--ring: rgba(11, 11, 11, .1);--shadow: 0 1px 2px rgba(0, 0, 0, .05), 0 4px 16px rgba(0, 0, 0, .05);--st-new: #d9d8d1;--st-weak: #d03b3b;--st-learning: #fab219;--st-review: #ec835a;--st-solid: #86b6ef;--st-mastered: #0ca30c;--v-stroke: #2b2b2a;--v-fill: #86b6ef;--v-fill-soft: #e7f0fc;--v-empty: #ffffff;--v-accent: #eb6834;--v-grid: #e1e0d9;--radius: 14px;--font: system-ui, -apple-system, "Segoe UI", Roboto, "PingFang SC", "Microsoft YaHei", sans-serif}@media (prefers-color-scheme: dark){:root:where(:not([data-theme=light])){color-scheme:dark;--bg: #0d0d0d;--surface: #1a1a19;--surface-2: #232322;--ink: #ffffff;--ink-2: #c3c2b7;--muted: #898781;--line: #2c2c2a;--axis: #383835;--accent: #3987e5;--accent-soft: #184f95;--accent-soft-2: #16283f;--good-ink: #0ca30c;--good-soft: #10301a;--bad-soft: #3a1818;--warn-soft: #3a2d0e;--ring: rgba(255, 255, 255, .1);--shadow: none;--st-new: #383835;--st-solid: #3987e5;--v-stroke: #e8e7e1;--v-fill: #2a78d6;--v-fill-soft: #16283f;--v-empty: #1a1a19;--v-grid: #2c2c2a}}:root[data-theme=dark]{color-scheme:dark;--bg: #0d0d0d;--surface: #1a1a19;--surface-2: #232322;--ink: #ffffff;--ink-2: #c3c2b7;--line: #2c2c2a;--axis: #383835;--accent: #3987e5;--accent-soft: #184f95;--accent-soft-2: #16283f;--good-ink: #0ca30c;--good-soft: #10301a;--bad-soft: #3a1818;--warn-soft: #3a2d0e;--ring: rgba(255, 255, 255, .1);--shadow: none;--st-new: #383835;--st-solid: #3987e5;--v-stroke: #e8e7e1;--v-fill: #2a78d6;--v-fill-soft: #16283f;--v-empty: #1a1a19;--v-grid: #2c2c2a}*{box-sizing:border-box}html,body{margin:0;background:var(--bg);color:var(--ink);font-family:var(--font);font-size:16px;line-height:1.5;-webkit-text-size-adjust:100%}a{color:var(--accent);text-decoration:none}button{font:inherit;cursor:pointer}input,select{font:inherit}h1,h2,h3{line-height:1.25;margin:0 0 8px}h1{font-size:1.5rem}h2{font-size:1.2rem}h3{font-size:1.02rem}.app{min-height:100vh;display:flex;flex-direction:column}.topbar{position:sticky;top:0;z-index:10;background:color-mix(in srgb,var(--bg) 88%,transparent);-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);border-bottom:1px solid var(--line)}.topbar-inner{max-width:980px;margin:0 auto;display:flex;align-items:center;gap:12px;padding:10px 16px}.brand{font-weight:800;font-size:1.1rem;color:var(--ink);display:flex;align-items:center;gap:8px;white-space:nowrap}.brand-mark{width:30px;height:30px;border-radius:9px;background:var(--accent);color:#fff;display:grid;place-items:center;font-size:.95rem;font-weight:800}.nav{display:flex;gap:4px;margin-left:auto}.nav a{padding:7px 12px;border-radius:10px;color:var(--ink-2);font-weight:600;font-size:.95rem}.nav a.on{background:var(--accent-soft-2);color:var(--accent)}main{flex:1;width:100%;max-width:980px;margin:0 auto;padding:18px 16px 96px}.bottomnav{display:none}@media (max-width: 720px){.nav{display:none}.bottomnav{display:flex;position:fixed;bottom:0;left:0;right:0;z-index:20;background:var(--surface);border-top:1px solid var(--line);padding:6px 4px calc(6px + env(safe-area-inset-bottom))}.bottomnav a{flex:1;display:flex;flex-direction:column;align-items:center;gap:2px;font-size:.72rem;color:var(--muted);font-weight:600;padding:4px 0}.bottomnav 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12px;min-height:44px;outline:none;width:100%}.input:focus{border-color:var(--accent)}.seg{display:inline-flex;background:var(--surface-2);border-radius:12px;padding:3px;gap:2px;flex-wrap:wrap}.seg button{border:0;background:transparent;color:var(--ink-2);padding:7px 12px;border-radius:9px;font-weight:600;font-size:.9rem}.seg button.on{background:var(--surface);color:var(--ink);box-shadow:0 1px 2px #00000014}.zh-sub{display:block;color:var(--ink-2);font-size:.9em;margin-top:2px}.progress{height:8px;border-radius:999px;background:var(--surface-2);overflow:hidden}.progress>div{height:100%;border-radius:999px;background:var(--accent);transition:width .3s}.hero{background:linear-gradient(135deg,var(--accent) 0%,#4a3aa7 100%);color:#fff;border-radius:18px;padding:20px}.hero .muted{color:#fffc}.stat{background:var(--surface);border:1px solid var(--ring);border-radius:var(--radius);padding:12px 14px}.stat .v{font-size:1.6rem;font-weight:800;line-height:1.1}.stat 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.mini{position:absolute;left:6px;right:6px;bottom:5px;height:3px;border-radius:3px;background:var(--surface-2);overflow:hidden}.grade-pills .mini>i{display:block;height:100%;background:var(--good)}.qcard{background:var(--surface);border-radius:18px;border:1px solid var(--ring);box-shadow:var(--shadow);padding:18px}.qprompt{font-size:1.14rem;font-weight:600;line-height:1.55}.qprompt .katex{font-size:1.12em}.qvisual{display:flex;justify-content:center;margin:14px 0 4px;overflow-x:auto}.qvisual svg{max-width:100%;height:auto}.answer-row{display:flex;gap:8px;margin-top:14px;flex-wrap:wrap;align-items:flex-end}.answer-input{flex:1;min-width:140px;font-size:1.25rem;font-weight:700;padding:10px 14px;border-radius:12px;border:2px solid var(--line);background:var(--surface);color:var(--ink);min-height:52px;outline:none}.answer-input:focus{border-color:var(--accent)}.answer-input.ok{border-color:var(--good);background:var(--good-soft)}.answer-input.no{border-color:var(--bad);background:var(--bad-soft)}.multi-field{display:flex;flex-direction:column;gap:4px;flex:1;min-width:110px}.multi-field span{font-size:.8rem;font-weight:700;color:var(--ink-2)}.keypad{display:flex;gap:6px;margin-top:8px;flex-wrap:wrap}.keypad button{border:1px solid var(--line);background:var(--surface-2);color:var(--ink);border-radius:10px;min-width:44px;height:40px;font-weight:700;font-size:1.05rem}.choices{display:grid;grid-template-columns:repeat(auto-fit,minmax(130px,1fr));gap:8px;margin-top:14px}.choice{border:2px solid 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.grid{stroke:var(--line);stroke-width:1}.chart .axis{stroke:var(--axis)}.chart text{fill:var(--muted);font-size:11px;font-family:var(--font);font-variant-numeric:tabular-nums}.chart .series{stroke:var(--accent);stroke-width:2;fill:none}.chart .bar{fill:var(--accent)}.chart .hit{fill:transparent}.chart-tip{position:absolute;pointer-events:none;background:var(--ink);color:var(--surface);font-size:.78rem;font-weight:600;padding:5px 8px;border-radius:8px;white-space:nowrap;transform:translate(-50%,-115%)}.legend{display:flex;gap:12px;flex-wrap:wrap;font-size:.8rem;color:var(--ink-2)}.legend span{display:inline-flex;gap:6px;align-items:center}.heat{display:grid;grid-template-columns:repeat(auto-fill,minmax(14px,1fr));gap:3px}.heat a{aspect-ratio:1;border-radius:3px;display:block}table.plain{width:100%;border-collapse:collapse;font-size:.9rem}table.plain td,table.plain th{padding:7px 6px;border-bottom:1px solid var(--line);text-align:left}table.plain th{color:var(--muted);font-weight:700;font-size:.78rem}.print-only{display:none}@page{size:A4;margin:14mm 14mm 16mm}@media print{:root{--bg: #fff;--surface: #fff;--v-fill: #bbb;--v-fill-soft: #eee}.topbar,.bottomnav,.no-print{display:none!important}.print-only{display:block}main{padding:0;max-width:none}.qcard{box-shadow:none;border:0;border-bottom:1px solid #ccc;border-radius:0;padding:10px 0 16px;break-inside:avoid}.page-break{break-before:page}body{font-size:12pt}}.medal-svg{display:block;flex:none;margin:0 auto;overflow:visible}.medal-svg .m-sweep{animation:medal-sweep 2.6s ease-in-out .6s infinite}@keyframes medal-sweep{0%{transform:skew(-18deg) translate(-30px)}55%,to{transform:skew(-18deg) translate(150px)}}.medal-svg.locked{color:color-mix(in srgb,var(--muted) 55%,transparent)}.m-lock-rim{fill:var(--surface-2);stroke:color-mix(in srgb,var(--muted) 75%,transparent);stroke-width:1.4;stroke-dasharray:3 3}.m-lock-face{fill:color-mix(in srgb,var(--surface-2) 70%,var(--line))}.m-lock-icon{opacity:.7}.m-lock-badge{fill:var(--surface);stroke:color-mix(in srgb,var(--muted) 50%,transparent);stroke-width:1.2}.m-lock-glyph{fill:var(--muted)}.m-lock-shackle{stroke:var(--muted);stroke-width:1.8}.lvl-emblem{position:relative;flex:none;display:grid;place-items:center}.lvl-emblem:before,.lvl-emblem:after{content:"";position:absolute;clip-path:polygon(50% 0,93% 25%,93% 75%,50% 100%,7% 75%,7% 25%)}.lvl-emblem:before{top:0;right:0;bottom:0;left:0;background:linear-gradient(145deg,var(--c1),var(--c3) 55%,var(--c2));filter:drop-shadow(0 2px 3px rgba(0,0,0,.25))}.lvl-emblem:after{top:9%;right:9%;bottom:9%;left:9%;background:radial-gradient(circle at 35% 30%,#fff,var(--c1) 45%,var(--c2))}.lvl-animal{position:relative;z-index:1;line-height:1;filter:drop-shadow(0 1px 1px rgba(0,0,0,.2))}.lvl-num{position:absolute;z-index:2;bottom:-4px;right:-6px;min-width:22px;height:22px;padding:0 5px;border-radius:999px;display:grid;place-items:center;font-size:.72rem;font-weight:900;color:#fff;background:linear-gradient(180deg,#34406a,#141a2e);border:2px solid var(--surface)}.tier-pill{display:inline-block;margin:6px auto;padding:2px 12px;border-radius:999px;font-size:.75rem;font-weight:800;letter-spacing:.04em;text-transform:uppercase;color:var(--ink, #333);background:linear-gradient(135deg,var(--c1),var(--c2) 60%,var(--c3));box-shadow:inset 0 1px #fff9,0 1px 2px #00000026}.tier-pill.locked{color:var(--muted);background:var(--surface);box-shadow:inset 0 0 0 1px var(--line);text-transform:none;letter-spacing:0}.tier-track{display:flex;justify-content:center;gap:5px;margin:2px 0 6px}.tier-track i{width:10px;height:10px;transform:rotate(45deg);border-radius:2px;background:var(--surface);box-shadow:inset 0 0 0 1.5px color-mix(in srgb,var(--muted) 45%,transparent)}.tier-track i.on{background:linear-gradient(135deg,var(--c1),var(--c2) 55%,var(--c3));box-shadow:0 0 0 1px #00000014,0 1px 2px #0003}.tier-track i.next{animation:next-pulse 1.8s ease-in-out infinite}@keyframes next-pulse{50%{box-shadow:inset 0 0 0 1.5px var(--v-accent),0 0 0 3px color-mix(in srgb,var(--v-accent) 25%,transparent)}}.confetti{position:fixed;top:0;right:0;bottom:0;left:0;pointer-events:none;overflow:hidden;z-index:60}.confetti i{position:absolute;top:-12px;border-radius:2px;animation-name:confetti-fall;animation-timing-function:cubic-bezier(.25,.6,.5,1);animation-fill-mode:forwards}@keyframes confetti-fall{0%{transform:translate(0) rotate(0);opacity:1}to{transform:translate(var(--drift),105vh) rotate(var(--rot));opacity:.85}}.cele-backdrop{position:fixed;top:0;right:0;bottom:0;left:0;z-index:50;display:grid;place-items:center;padding:16px;background:#0a0a1473;animation:fade-in .2s ease-out}.cele-card{position:relative;z-index:61;width:min(380px,100%);background:var(--surface);color:var(--ink);border-radius:22px;padding:22px 20px;text-align:center;box-shadow:0 12px 40px #0000004d}.cele-kicker{font-weight:800;letter-spacing:.04em;text-transform:uppercase;color:var(--v-accent);font-size:.85rem}.cele-stage{position:relative;width:210px;height:200px;margin:4px auto 0;display:grid;place-items:center}.cele-rays{position:absolute;top:-10px;right:-10px;bottom:-10px;left:-10px;border-radius:50%;background:repeating-conic-gradient(from 0deg,color-mix(in srgb,var(--glow) 55%,transparent) 0 8deg,transparent 8deg 22deg);-webkit-mask:radial-gradient(circle,#000 18%,transparent 68%);mask:radial-gradient(circle,#000 18%,transparent 68%);animation:rays-spin 14s linear infinite,fade-in .6s ease-out}.cele-stage:before{content:"";position:absolute;width:62%;height:62%;border-radius:50%;background:radial-gradient(circle,color-mix(in srgb,var(--glow) 70%,#fff) 0,transparent 70%);filter:blur(6px)}@keyframes rays-spin{to{transform:rotate(360deg)}}.sparkles{position:absolute;top:0;right:0;bottom:0;left:0;pointer-events:none}.sparkles i{position:absolute;font-style:normal;font-size:18px;color:var(--glow);text-shadow:0 0 6px #fff;opacity:0;animation:twinkle 1.8s ease-in-out infinite}@keyframes twinkle{0%,to{opacity:0;transform:scale(.3) rotate(0)}50%{opacity:1;transform:scale(1.1) rotate(90deg)}}.cele-medal{position:relative;perspective:600px;animation:medal-in 1s cubic-bezier(.2,1.3,.4,1) both}.cele-big{font-size:4.4rem;line-height:1.1;margin:8px 0}.pop{animation:pop-in .45s cubic-bezier(.2,1.5,.4,1) both}.bounce{animation:bounce 1.2s ease-in-out .3s infinite}@keyframes fade-in{0%{opacity:0}}@keyframes pop-in{0%{transform:scale(.6);opacity:0}}@keyframes medal-in{0%{transform:translateY(-40px) scale(.3) rotateY(540deg);opacity:0}65%{transform:translateY(4px) scale(1.1) rotateY(-12deg);opacity:1}to{transform:none}}@keyframes bounce{0%,to{transform:translateY(0)}50%{transform:translateY(-10px)}}.toast{position:fixed;z-index:62;left:50%;top:72px;transform:translate(-50%);max-width:calc(100% - 32px);background:var(--warn);color:#1b1200;font-weight:800;padding:12px 18px;border-radius:999px;box-shadow:0 8px 24px #0003;cursor:pointer;text-align:center}.toast.pop{animation:toast-in .45s cubic-bezier(.2,1.5,.4,1) both}@keyframes toast-in{0%{transform:translate(-50%,-30px) scale(.8);opacity:0}}.reward-strip{gap:12px}.xpbar{height:10px;margin:6px 0 3px;border-radius:999px;background:var(--surface-2);overflow:hidden}.xpbar>div{height:100%;border-radius:999px;background:linear-gradient(90deg,var(--warn),var(--v-accent));transition:width .8s cubic-bezier(.2,.8,.2,1)}.xpbar.thin{height:6px;margin:6px 0 2px}.reward-row{display:grid;grid-template-columns:repeat(3,1fr);gap:8px}.reward-item{display:flex;flex-direction:column;align-items:center;gap:2px;text-align:center;text-decoration:none}.reward-item b{font-size:1.15rem}.flame{font-size:1.9rem;line-height:56px;height:56px;filter:grayscale(1);opacity:.4}.flame.lit{filter:none;opacity:1;animation:flicker 2.4s ease-in-out 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