:root{--bg: #f6f7f4;--card: #ffffff;--ink: #1c2421;--muted: #5f6b67;--line: #e2e6e1;--teal: #0f766e;--teal-2: #115e59;--teal-soft: #e6f3f1;--orange: #c2410c;--orange-soft: #fff1e8;--ok: #15803d;--ok-soft: #e8f6ec;--warn: #b45309;--warn-soft: #fef6e7;--bad: #b91c1c;--bad-soft: #fdecec;--radius: 14px;--shadow: 0 1px 2px rgba(20, 30, 25, .06), 0 4px 14px rgba(20, 30, 25, .05);--cn: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", "Noto Sans CJK SC", "Source Han Sans SC", sans-serif;--ui: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Noto Sans", "Helvetica Neue", Arial, "PingFang SC", "Microsoft YaHei", "Noto Sans CJK SC", sans-serif;color-scheme:light}*{box-sizing:border-box}html{-webkit-text-size-adjust:100%}body{margin:0;background:var(--bg);color:var(--ink);font-size:16px;line-height:1.6;font-family:var(--ui)}button,input,select{font:inherit;color:inherit}a{color:var(--teal)}h1,h2,h3,h4{line-height:1.3;margin:0 0 .4em}p{margin:0 0 .7em}.cn{font-family:var(--cn)}.muted{color:var(--muted)}.small{font-size:.875rem}.center{text-align:center}.app{min-height:100vh;padding-bottom:76px}.topbar{position:sticky;top:0;z-index:20;background:#fffffff0;-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);border-bottom:1px solid var(--line);display:flex;align-items:center;gap:16px;padding:8px 16px}.brand{display:flex;align-items:center;gap:10px;text-decoration:none;color:var(--ink);min-width:0}.brand b{display:block;font-size:1rem}.brand small{display:block;color:var(--muted);font-size:.78rem;white-space:nowrap}.logo{width:38px;height:38px;border-radius:10px;background:var(--teal);color:#fff;display:grid;place-items:center;font:700 21px/1 var(--cn);flex:none}.nav{display:flex;gap:4px;margin-left:auto}.nav a{display:flex;align-items:center;gap:6px;padding:8px 12px;border-radius:10px;text-decoration:none;color:var(--muted);font-weight:600;font-size:.92rem}.nav a:hover{background:var(--teal-soft);color:var(--teal-2)}.nav a.on{background:var(--teal);color:#fff}.nav-num{width:20px;height:20px;border-radius:6px;border:1.6px solid currentColor;display:grid;place-items:center;font-size:.75rem;font-weight:700}.main{max-width:1060px;margin:0 auto;padding:20px 16px 40px}@media(max-width:860px){.topbar{padding:8px 16px}.nav{position:fixed;bottom:0;left:0;right:0;background:#fff;border-top:1px solid var(--line);justify-content:space-around;padding:4px 2px calc(4px + env(safe-area-inset-bottom));gap:0;box-shadow:0 -2px 10px #0000000a}.nav a{flex-direction:column;gap:2px;padding:6px 4px;font-size:.7rem;flex:1;min-width:0;text-align:center}.nav a.on{background:var(--teal-soft);color:var(--teal-2)}.main{padding-top:14px}}.btn{display:inline-flex;align-items:center;justify-content:center;gap:7px;border:1px solid var(--line);background:#fff;border-radius:11px;padding:10px 16px;font-weight:600;cursor:pointer;text-decoration:none;color:var(--ink);min-height:44px;transition:background .15s,border-color .15s,transform .05s}.btn:active{transform:scale(.98)}.btn.primary{background:var(--teal);border-color:var(--teal);color:#fff}.btn.primary:hover{background:var(--teal-2)}.btn.ghost{background:#fff}.btn.ghost:hover{border-color:var(--teal);color:var(--teal-2)}.btn.ok{color:var(--ok);border-color:#bfe3cb;background:var(--ok-soft)}.btn.warn{color:var(--warn);border-color:#f3d9a8;background:var(--warn-soft)}.btn.picked{box-shadow:inset 0 0 0 2px currentColor}.btn.sm{padding:7px 12px;min-height:38px;font-size:.88rem}.btn.xs{padding:4px 10px;min-height:30px;font-size:.8rem;border-radius:8px}.btn.wide{width:100%;margin-top:8px}.btn.icon{padding:0;width:44px;flex:none}.linklike{background:none;border:0;color:var(--teal);text-decoration:underline;cursor:pointer;padding:0}.row{display:flex;flex-wrap:wrap;gap:10px}.audio-btn{display:inline-flex;align-items:center;gap:5px;border-radius:999px;border:1px solid #b9ddd8;background:var(--teal-soft);color:var(--teal-2);padding:0 14px;height:40px;min-width:40px;justify-content:center;cursor:pointer;font-weight:600;font-size:.9rem}.audio-btn.sm{height:34px;min-width:34px;padding:0 9px;font-size:.8rem}.audio-btn.orange{background:var(--orange-soft);border-color:#f6cfb5;color:var(--orange)}.audio-btn.on{background:var(--teal);color:#fff;border-color:var(--teal)}.audio-btn.orange.on{background:var(--orange);border-color:var(--orange)}.card,.panel{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);padding:18px;margin-bottom:16px}.panel h3{display:flex;align-items:center;gap:8px}.panel-head{display:flex;justify-content:space-between;align-items:flex-start;gap:12px;flex-wrap:wrap;margin-bottom:10px}.panel-head p{margin:0}.section-title{display:flex;align-items:center;gap:8px;font-size:1.15rem;margin:8px 0 12px}.tag{display:inline-flex;align-items:center;gap:3px;font-size:.72rem;font-weight:700;padding:2px 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.cn{color:var(--orange)}.focus{display:flex;flex-wrap:wrap;gap:6px;align-items:center}.focus-chip{background:#fff;border:1px solid var(--line);border-radius:999px;padding:3px 10px;font-size:.85rem}.focus-chip b{color:var(--orange);margin-right:2px}.sides{display:flex;flex-direction:column;gap:10px}.side{display:flex;gap:10px;background:#fff;border:1px solid var(--line);border-radius:12px;padding:12px;font-size:.9rem}.side p{margin:2px 0 0}.side.zh{border-left:4px solid var(--teal)}.side.vi{border-left:4px solid var(--orange)}.side svg{flex:none;margin-top:2px;color:var(--muted)}.days{display:grid;grid-template-columns:repeat(3,1fr);gap:14px;margin-bottom:22px}.day-card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:16px;box-shadow:var(--shadow);display:flex;flex-direction:column}.day-card.complete{border-color:#bfe3cb}.day-card h3{margin-top:6px;font-size:1.05rem}.day-card .cn{margin-bottom:6px}.day-head{display:flex;justify-content:space-between;align-items:center}.day-num{font-size:.75rem;font-weight:800;text-transform:uppercase;letter-spacing:.05em;color:#fff;background:var(--orange);padding:3px 9px;border-radius:6px}.tasks{list-style:none;padding:0;margin:2px 0 10px;flex:1}.tasks a{display:flex;gap:8px;align-items:flex-start;padding:5px 0;text-decoration:none;color:var(--ink);font-size:.9rem}.tasks a svg{flex:none;margin-top:3px;color:#a7b0ac}.tasks a.done{color:var(--muted)}.tasks a.done svg{color:var(--ok)}.two-col{display:grid;grid-template-columns:1fr 1fr;gap:16px}.reset{margin-top:10px}.day-banner{display:flex;justify-content:space-between;align-items:flex-end;gap:16px;flex-wrap:wrap;margin-bottom:12px}.day-banner h1{font-size:1.5rem;margin:8px 0 2px}.day-banner p{margin:0}.day-banner-progress{width:220px;max-width:100%}.subtabs{display:flex;gap:6px;overflow-x:auto;padding-bottom:4px;margin-bottom:14px;scrollbar-width:none}.subtabs::-webkit-scrollbar{display:none}.subtabs a{display:flex;align-items:center;gap:6px;white-space:nowrap;padding:9px 14px;border-radius:999px;background:#fff;border:1px solid var(--line);text-decoration:none;color:var(--ink);font-weight:600;font-size:.9rem}.subtabs a.on{background:var(--ink);border-color:var(--ink);color:#fff}.subtabs .tick{color:var(--ok)}.subtabs a.on .tick{color:#86efac}.next{display:flex;justify-content:flex-end;margin-top:4px}.goal,.howto{display:flex;gap:10px;align-items:flex-start;background:var(--warn-soft);border:1px solid #f3dfb8;border-radius:12px;padding:10px 14px;margin-bottom:14px;font-size:.93rem}.howto{background:var(--teal-soft);border-color:#c9e6e1}.goal svg,.howto svg{flex:none;margin-top:3px}.reading .read-block{padding:4px 0 14px;border-bottom:1px dashed var(--line);margin-bottom:14px}.reading .read-block:last-of-type{border-bottom:0}.reading p{max-width:72ch}.diagram{margin:14px 0 6px;background:#fbfcfb;border:1px solid var(--line);border-radius:12px;padding:12px}.diagram figcaption{font-weight:700;margin-bottom:6px}.diagram-svg svg{width:100%;height:auto;display:block}.legend{list-style:none;padding:0;margin:10px 0 0;display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:6px 14px}.legend li{display:flex;align-items:baseline;gap:6px;flex-wrap:wrap;font-size:.9rem}.legend .num{width:22px;height:22px;border-radius:50%;border:2px solid var(--teal);color:var(--teal);font-weight:700;font-size:.75rem;display:inline-grid;place-items:center;flex:none;align-self:center}.legend .zh{font-family:var(--cn);font-weight:700}.legend .py{color:var(--muted);font-size:.8rem}.table-wrap{overflow-x:auto;margin:10px 0}.grid-table{border-collapse:collapse;width:100%;font-size:.9rem}.grid-table th,.grid-table td{border:1px solid var(--line);padding:7px 10px;text-align:left;vertical-align:top}.grid-table thead th{background:var(--teal-soft);font-family:var(--cn)}.grid-table tbody th{background:#fafbfa;font-weight:600;white-space:nowrap}.chips{display:flex;flex-wrap:wrap;gap:6px;margin-bottom:10px}.chip{border:1px solid var(--line);background:#fff;border-radius:999px;padding:6px 12px;cursor:pointer;font-size:.87rem;font-weight:600}.chip.on{background:var(--teal);border-color:var(--teal);color:#fff}.chip-zh{font-family:var(--cn);font-weight:400;opacity:.75}.toolbar{display:flex;flex-wrap:wrap;gap:8px;align-items:center;margin-bottom:14px}.check{display:inline-flex;align-items:center;gap:6px;font-size:.9rem;cursor:pointer}.check input{width:18px;height:18px;accent-color:var(--teal)}.select{display:inline-flex;align-items:center;gap:6px;font-size:.88rem}.select select{border:1px solid var(--line);border-radius:9px;padding:7px 8px;background:#fff}.segmented{display:inline-flex;background:#eef1ee;border-radius:11px;padding:3px;gap:2px}.segmented button{border:0;background:transparent;padding:7px 12px;border-radius:9px;cursor:pointer;font-weight:600;font-size:.87rem;display:inline-flex;gap:5px;align-items:center;color:var(--muted)}.segmented button.on{background:#fff;color:var(--ink);box-shadow:0 1px 3px #0000001a}.empty{display:flex;gap:10px;align-items:center;justify-content:center;padding:30px;color:var(--ok);font-weight:600}.deck{max-width:560px;margin:0 auto}.deck-count{display:flex;justify-content:center;gap:8px;align-items:center;color:var(--muted);font-size:.88rem;margin-bottom:8px}.flashcard{background:linear-gradient(180deg,#fff,#f8fbfa);border:1.5px solid #cfe5e1;border-radius:18px;min-height:250px;padding:26px 18px 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auto;gap:4px 14px}.word-list li.known .wl-zh{color:var(--ok)}.wl-main{display:flex;flex-wrap:wrap;align-items:baseline;gap:2px 10px;min-width:0}.wl-zh{font:600 1.15rem var(--cn)}.wl-py{color:var(--teal);font-size:.88rem}.wl-vi{flex-basis:100%}.wl-vi em{color:var(--orange);font-style:normal;font-size:.88rem}.wl-act{display:flex;gap:6px;align-items:center;flex:none}.knew{width:34px;height:34px;border-radius:50%;border:1.5px solid var(--line);background:#fff;color:#c3cac7;cursor:pointer;display:grid;place-items:center}.knew.on{background:var(--ok);border-color:var(--ok);color:#fff}.sent-card{max-width:640px;margin:0 auto;border:1.5px solid var(--line);border-radius:18px;padding:18px;background:#fff;box-shadow:var(--shadow)}.sent-card.zh{border-top:5px solid var(--teal)}.sent-card.vi{border-top:5px solid var(--orange)}.sent-top{display:flex;justify-content:space-between;align-items:center;margin-bottom:10px}.who{font-size:.75rem;font-weight:700;padding:3px 9px;border-radius:999px}.who.zh{background:var(--teal-soft);color:var(--teal-2)}.who.vi{background:var(--orange-soft);color:var(--orange)}.sent-src{font-size:1.25rem;font-weight:600;line-height:1.55;margin-bottom:12px;transition:filter .2s}.sent-src.cn{font:600 1.45rem/1.6 var(--cn)}.blur{filter:blur(7px);-webkit-user-select:none;user-select:none}.sent-audio{display:flex;gap:8px;margin-bottom:10px}.sent-ans{background:#fbf8f4;border:1px dashed #efcfb5;border-radius:12px;padding:12px 14px;margin-top:8px}.ans-label{font-size:.78rem;color:var(--orange);font-weight:700;margin-bottom:4px}.ans-text{font-size:1.12rem;margin-bottom:8px}.ans-text.cn{font:1.3rem/1.6 var(--cn)}.dots{display:flex;flex-wrap:wrap;gap:6px;justify-content:center;margin-top:16px}.dot{width:14px;height:14px;border-radius:50%;border:1.5px solid #c5ccc9;background:#fff;cursor:pointer;padding:0}.dot.ok{background:var(--ok);border-color:var(--ok)}.dot.again{background:#f59e0b;border-color:#f59e0b}.dot.cur{outline:2px solid var(--ink);outline-offset:2px}.quiz{max-width:620px;margin:0 auto}.quiz-top{display:flex;justify-content:space-between;font-size:.88rem}.quiz-bar{height:6px;background:#edf0ec;border-radius:99px;margin:6px 0 16px;overflow:hidden}.quiz-bar div{height:100%;background:var(--teal);transition:width .3s}.quiz-ask{font-size:.85rem;font-weight:700;color:var(--orange);text-transform:uppercase;letter-spacing:.03em}.quiz-prompt{font-size:1.4rem;font-weight:700;margin:6px 0 14px}.quiz-prompt.cn{font:600 2rem/1.35 var(--cn)}.quiz-prompt.know{font-size:1.15rem}.quiz-prompt small{display:block;font:400 1rem var(--ui);color:var(--teal)}.quiz-listen{display:flex;gap:10px;align-items:center;flex-wrap:wrap;margin:10px 0 16px}.reveal{font-size:1.5rem;font-weight:600}.reveal small{font-size:.9rem;color:var(--teal);font-family:var(--ui)}.options{display:grid;gap:8px}.option{display:flex;align-items:center;gap:10px;text-align:left;border:1.5px solid var(--line);border-radius:12px;background:#fff;padding:12px 14px;cursor:pointer;min-height:52px;font-size:1rem}.option.cn{font-family:var(--cn);font-size:1.15rem}.option:hover{border-color:var(--teal)}.option>span:nth-child(2){flex:1}.opt-letter{width:26px;height:26px;border-radius:7px;background:#eef1ee;display:grid;place-items:center;font-weight:700;font-size:.8rem;flex:none;font-family:var(--ui)}.option.right{border-color:var(--ok);background:var(--ok-soft);color:var(--ok)}.option.wrong{border-color:var(--bad);background:var(--bad-soft);color:var(--bad)}.option.dim{opacity:.55}.quiz-result{text-align:center;max-width:560px;margin:0 auto}.quiz-result .big{font-size:3rem;font-weight:800;line-height:1.1}.quiz-result .gold{color:#d97706}.wrong-list{text-align:left;list-style:none;padding:0;margin:14px 0;border:1px solid var(--line);border-radius:12px}.wrong-list li{padding:8px 12px;border-bottom:1px solid var(--line);display:flex;flex-wrap:wrap;gap:4px 10px;font-size:.92rem}.wrong-list li:last-child{border-bottom:0}.wrong-list b{color:var(--ok)}.scene h4{margin:18px 0 8px;padding:6px 12px;background:#f1f3f0;border-radius:8px;font-size:.95rem}.line{border:1px solid var(--line);border-left:4px solid var(--teal);border-radius:10px;padding:10px 12px;margin-bottom:8px;background:#fff;transition:box-shadow .2s,background .2s}.line.vi{border-left-color:var(--orange)}.line.active{background:#fffdf5;box-shadow:0 0 0 2px #fcd34d}.line-head{display:flex;align-items:center;gap:8px;flex-wrap:wrap;margin-bottom:6px}.line-act{margin-left:auto;display:flex;gap:6px;align-items:center}.countdown{font-size:.8rem;font-weight:700;color:#b45309;background:#fef3c7;padding:2px 8px;border-radius:99px}.countdown.soft{color:var(--teal-2);background:var(--teal-soft)}.line-src{font-size:1.05rem;font-weight:600;margin-bottom:6px}.line-src.cn{font-size:1.2rem}.line-ans{display:flex;gap:8px;align-items:center;justify-content:space-between;background:#fbf8f4;border-radius:8px;padding:6px 10px;color:#6b3d1e}.search{display:flex;align-items:center;gap:8px;border:1.5px solid var(--line);border-radius:12px;padding:0 12px;background:#fff;margin-bottom:6px}.search:focus-within{border-color:var(--teal)}.search input{border:0;outline:0;flex:1;padding:12px 0;font-size:1rem;min-width:0}.sub-title{margin-top:18px}.handbook-hero{display:grid;grid-template-columns:1.2fr 1fr;gap:18px;align-items:center}.handbook-hero h1{font-size:1.45rem}.note-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(200px,1fr));gap:8px}.note-grid div{border:1px dashed #c9d2ce;border-radius:10px;padding:8px 10px;display:flex;flex-direction:column;font-size:.88rem}@media(max-width:860px){.hero,.two-col,.handbook-hero,.days{grid-template-columns:1fr}.hero{padding:16px}.hero h1{font-size:1.45rem}.card,.panel{padding:14px}.sent-list li{grid-template-columns:1fr auto}.sent-list li>div:nth-child(2){grid-column:1;color:var(--muted)}.sent-list li .wl-act{grid-row:1 / span 2;grid-column:2}.fc-zh{font-size:2rem}.day-banner h1{font-size:1.25rem}.day-banner-progress{width:100%}}@media(max-width:600px){.diagram-svg{overflow-x:auto;margin:0 -12px;padding:0 12px}.diagram-svg svg{min-width:560px}.diagram .swipe-hint{display:block}}.swipe-hint{display:none;font-size:.78rem;color:var(--muted);text-align:center;margin-top:2px}@media(max-width:380px){.brand small{display:none}.deck-actions .btn{padding:10px 8px;font-size:.88rem}}