:root{--bg:#f3efe4;--ink:#1c2430;--muted:#5d6b7a;--card:#fffdf8;--line:#e4d8c6;--teal:#0f6e62;--teal-soft:#e6f4f1;--amber:#9a5b10;--amber-soft:#fff3df;--coral:#a33b32;--coral-soft:#fdeceb;--blue:#1f5f8b;--green:#1d7a4a;--shadow:0 10px 28px #37280c0f;--radius:18px;--nav:calc(4.4rem + env(safe-area-inset-bottom));color:var(--ink);background:var(--bg);font-family:PingFang HK,PingFang TC,Noto Sans TC,Microsoft JhengHei,Segoe UI,sans-serif;line-height:1.5}*{box-sizing:border-box}body{margin:0}button,input,select,textarea{font:inherit;color:inherit}button{cursor:pointer}a{color:var(--teal)}img{max-width:100%}.boot{place-items:center;min-height:100vh;display:grid}.app{min-height:100vh}.main{width:min(920px,100%);padding:16px 16px var(--nav);margin:0 auto}.top{align-items:center;gap:10px;margin-bottom:14px;display:flex}.brand{color:inherit;align-items:center;gap:8px;font-weight:800;text-decoration:none;display:flex}.brand small{color:var(--muted);font-weight:600;display:block}.mark{width:32px;height:32px}.spacer{flex:1}.chip,.lang{border:1px solid var(--line);background:var(--card);border-radius:999px;min-height:36px;padding:6px 10px}.lang{font-weight:700}.tabbar{padding:6px 8px env(safe-area-inset-bottom);border-top:1px solid var(--line);z-index:5;background:#fffdf8f5;grid-template-columns:repeat(5,1fr);gap:2px;display:grid;position:fixed;bottom:0;left:0;right:0}.tabbar a{color:var(--muted);text-align:center;border-radius:12px;padding:6px 0;font-size:12px;font-weight:700;text-decoration:none}.tabbar a.active{color:var(--teal);background:var(--teal-soft)}.sider{display:none}h1{margin:0 0 6px;font-size:1.7rem;line-height:1.2}h2{margin:0 0 8px;font-size:1.15rem}.lead{color:var(--muted);margin:0 0 14px}.row{flex-wrap:wrap;align-items:center;gap:8px;display:flex}.grid{gap:12px;display:grid}.scroll-row{gap:10px;padding-bottom:4px;display:flex;overflow-x:auto}.card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);padding:14px}.card h2{margin-top:0}.banner{background:var(--amber-soft);border-radius:var(--radius);border:1px solid #efd3a4;padding:12px 14px}.banner.safe{background:var(--coral-soft);border-color:#f3c7c3}.banner.ok{background:var(--teal-soft);border-color:#b7e0d8}.btn,.btn.secondary,.btn.ghost,.choice{border:1.5px solid #0000;border-radius:14px;min-height:48px;padding:10px 14px;font-weight:700}.btn{background:var(--teal);color:#fff}.btn.secondary{color:var(--teal);border-color:var(--teal);background:0 0}.btn.ghost{color:var(--ink);border-color:var(--line);background:0 0}.btn:disabled{opacity:.5}.choice{text-align:left;border-color:var(--line);background:#fff;width:100%;margin-bottom:8px}.choice[aria-checked=true]{border-color:var(--teal);background:var(--teal-soft)}.choice.good{border-color:var(--green);background:#e8f6ee}.choice.bad{border-color:var(--coral);background:var(--coral-soft)}.field,textarea,select{border:1.5px solid var(--line);background:#fff;border-radius:12px;width:100%;margin-top:6px;padding:12px}textarea{min-height:120px}.field{min-height:48px;font-size:16px}.stem{margin:0 0 8px;font-size:1.15rem}.stem-sub{color:var(--muted);margin:0 0 10px}.kicker{letter-spacing:.04em;color:var(--teal);font-size:12px;font-weight:800}.hint{background:var(--amber-soft);border-radius:12px;margin:8px 0;padding:10px 12px}.explain{background:var(--teal-soft);border-radius:12px;margin-top:8px;padding:10px 12px}.terms{flex-wrap:wrap;gap:6px;margin-top:8px;display:flex}.terms span{background:#fff;border-radius:999px;padding:2px 8px;font-size:13px}.dot{border-radius:50%;width:10px;height:10px;display:inline-block}.dot.mastered{background:var(--green)}.dot.weak{background:var(--amber)}.dot.unseen{background:#c5cdd6}.node{align-items:flex-start;gap:10px;display:flex}.node.ahead{outline:1px dashed var(--blue)}.week{grid-template-columns:repeat(7,1fr);align-items:end;gap:6px;height:120px;display:grid}.week-col{flex-direction:column;justify-content:flex-end;align-items:center;gap:4px;height:100%;display:flex}.week-bar{background:var(--teal);border-radius:8px 8px 2px 2px;width:100%;min-height:4px}.week-col span{color:var(--muted);font-size:12px}.bar{background:#efe6d6;border-radius:99px;height:8px;overflow:hidden}.bar>span{background:var(--teal);height:100%;display:block}.timer{font-variant-numeric:tabular-nums;margin:0;font-size:2.4rem;font-weight:800}.muted{color:var(--muted)}.list{gap:8px;margin:0;padding:0;list-style:none;display:grid}.split{justify-content:space-between;gap:8px;display:flex}.tag{color:var(--amber);font-size:12px;font-weight:800}@media (width>=960px){.tabbar{display:none}.sider{border-right:1px solid var(--line);background:#fffdf8;flex-direction:column;gap:4px;width:200px;padding:18px 12px;display:flex;position:fixed;inset:0 auto 0 0}.sider a{color:var(--ink);border-radius:12px;padding:10px 12px;font-weight:700;text-decoration:none}.sider a.active{background:var(--teal-soft);color:var(--teal)}.main{width:min(880px,100% - 220px);margin-left:200px;padding:28px 28px 48px}.plan-grid{grid-template-columns:1fr 1fr}}@media (prefers-reduced-motion:reduce){*{scroll-behavior:auto!important}}@media print{.tabbar,.sider,.top,.noprint{display:none!important}.main{width:100%;margin:0;padding:0}.card{box-shadow:none}}