:root{--ground: #EEF1F0;--paper: #FFFFFF;--ink: #16201E;--muted: #5C6B68;--line: #D6DDDB;--jade: #0E6B5C;--jade-soft: #DCEEE9;--seal: #C2402A;--seal-soft: #F7E2DC;--amber: #9A6A00;--amber-soft: #F6ECD2;--on-jade: #FFFFFF;--f: system-ui, -apple-system, "PingFang SC", "Microsoft YaHei", "Noto Sans SC", "Segoe UI", Roboto, sans-serif;--f-mark: "Songti SC", "Noto Serif SC", "SimSun", serif;color-scheme:light}@media(prefers-color-scheme:dark){:root{--ground: #0F1514;--paper: #18201F;--ink: #E6EEEC;--muted: #9AABA7;--line: #2C3735;--jade: #4FC2AE;--jade-soft: #173A34;--seal: #F0785F;--seal-soft: #3D211B;--amber: #E2B54C;--amber-soft: #3A2F12;--on-jade: #0B1513;color-scheme:dark}}*{box-sizing:border-box}html,body{margin:0;background:var(--ground);color:var(--ink);font:16px/1.5 var(--f);-webkit-text-size-adjust:100%}a{color:var(--jade)}button{font:inherit;color:inherit}input,textarea{font:inherit;color:var(--ink);background:var(--paper);border:1px solid var(--line);border-radius:12px;padding:11px 12px;width:100%}input:focus-visible,textarea:focus-visible,button:focus-visible,a:focus-visible,.para:focus-visible{outline:2px solid var(--jade);outline-offset:2px}h3{margin:0;font-size:15px}.page{max-width:760px;margin:0 auto;display:flex;flex-direction:column;gap:14px;padding:max(12px,env(safe-area-inset-top)) max(16px,env(safe-area-inset-right)) max(28px,env(safe-area-inset-bottom)) max(16px,env(safe-area-inset-left))}.page.narrow{max-width:480px}.center{text-align:center}.muted{color:var(--muted)}.small{font-size:13px}.num{font-variant-numeric:tabular-nums}.row{display:flex;align-items:center;gap:8px}.row.between{justify-content:space-between}.row.gap{gap:10px;flex-wrap:wrap}.grow{flex:1}.stack{display:flex;flex-direction:column;gap:12px}.stack.tight{gap:6px}.logo{font-family:var(--f-mark);font-weight:700;color:var(--jade);font-size:22px;line-height:1}.logo.big{font-size:36px}.lang-head{display:flex;flex-direction:column;align-items:center;gap:8px;padding:32px 0 8px;text-align:center}.tiles{display:grid;grid-template-columns:1fr 1fr;gap:8px}.tile{border:1.5px solid var(--line);background:var(--paper);border-radius:14px;padding:14px 10px;font-size:17px;font-weight:500;cursor:pointer}.tile.on{border-color:var(--jade);background:var(--jade-soft);color:var(--jade)}.apphead{display:flex;justify-content:space-between;align-items:center;min-height:40px}.apphead.slim{min-height:0}.back{background:none;border:0;padding:6px 0;font-size:17px;font-weight:700;cursor:pointer;text-align:left;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;max-width:100%}.icon-btn{background:var(--paper);border:1px solid var(--line);border-radius:50%;width:36px;height:36px;cursor:pointer;font-size:17px}.quota{font-size:13px;background:var(--jade-soft);color:var(--jade);border-radius:999px;padding:5px 11px;font-weight:600}.quota.empty{background:var(--seal-soft);color:var(--seal)}.bigbtn{display:flex;flex-direction:column;align-items:center;gap:6px;background:var(--jade);color:var(--on-jade);border:0;border-radius:22px;padding:26px 16px;cursor:pointer;text-align:center}.bigbtn:disabled{opacity:.5;cursor:default}.bigbtn .plus{width:52px;height:52px;border-radius:50%;background:#ffffff2e;display:grid;place-items:center;font-size:30px;line-height:1}.bigbtn b{font-size:19px}.bigbtn span:last-child{font-size:13px;opacity:.85}.tip{background:var(--amber-soft);border-radius:14px;padding:11px 13px;font-size:14px;display:flex;flex-direction:column;gap:3px}.tip b{color:var(--amber)}.error{background:var(--seal-soft);color:var(--seal);border-radius:12px;padding:10px 12px;font-size:14px}.chips{display:flex;gap:6px;overflow-x:auto;padding-bottom:2px}.chipbtn{flex:none;border:1px solid var(--line);background:var(--paper);border-radius:999px;padding:6px 12px;font-size:14px;cursor:pointer}.chipbtn i{font-style:normal;color:var(--muted);font-size:12px}.chipbtn.on{border-color:var(--jade);color:var(--jade);background:var(--jade-soft)}.list{list-style:none;margin:0;padding:0;background:var(--paper);border-radius:16px;border:1px solid var(--line)}.list:empty{display:none}.list li+li{border-top:1px solid var(--line)}.item{display:flex;flex-direction:column;gap:4px;padding:12px 14px;text-decoration:none;color:inherit}.item b{font-size:16px}.meta{font-size:13px;color:var(--muted);display:flex;gap:10px;flex-wrap:wrap;align-items:center;font-variant-numeric:tabular-nums}.chip{font-size:12px;border-radius:999px;padding:1px 9px;font-weight:600}.chip.ok{background:var(--jade-soft);color:var(--jade)}.chip.run{background:var(--amber-soft);color:var(--amber)}.chip.err{background:var(--seal-soft);color:var(--seal)}.bar{height:5px;border-radius:5px;background:var(--line);overflow:hidden}.bar>span{display:block;height:100%;background:var(--amber);transition:width .4s}.field{display:flex;flex-direction:column;gap:5px;font-size:14px;color:var(--muted)}.check{display:flex;gap:10px;align-items:flex-start;font-size:14px;cursor:pointer}.check input{width:20px;height:20px;flex:none;margin-top:1px;accent-color:var(--jade)}.checks{display:flex;flex-direction:column;gap:10px}.btn{display:inline-flex;justify-content:center;align-items:center;border:1px solid var(--line);background:var(--paper);border-radius:14px;padding:13px;font-size:16px;font-weight:600;cursor:pointer;text-decoration:none;color:var(--ink)}.btn.main{background:var(--jade);border-color:var(--jade);color:var(--on-jade)}.btn.ghost{background:none;border-color:transparent;color:var(--muted);font-weight:500}.btn:disabled{opacity:.5;cursor:default}.file{display:flex;gap:12px;align-items:center;border:1px dashed var(--jade);border-radius:14px;padding:12px;background:var(--jade-soft)}.file .ic{width:42px;height:42px;flex:none;border-radius:10px;background:var(--jade);color:var(--on-jade);display:grid;place-items:center;font-size:11px;font-weight:700}.file div{display:flex;flex-direction:column;min-width:0;font-size:13px;color:var(--muted)}.file b{color:var(--ink);font-size:15px;overflow-wrap:anywhere}.steps{list-style:none;margin:0;padding:0;background:var(--paper);border-radius:16px;border:1px solid var(--line)}.steps li{display:grid;grid-template-columns:26px 1fr auto;gap:10px;align-items:center;padding:12px 14px}.steps li+li{border-top:1px solid var(--line)}.dot{width:24px;height:24px;border-radius:50%;border:2px solid var(--line);display:grid;place-items:center;font-size:13px;color:var(--on-jade)}.steps .done .dot{background:var(--jade);border-color:var(--jade)}.steps .now .dot{border-color:var(--amber);background:var(--amber-soft);animation:pulse 1.6s infinite}.steps .now{font-weight:700}@keyframes pulse{50%{opacity:.5}}.eta{background:var(--jade-soft);border-radius:16px;padding:14px;text-align:center;display:flex;flex-direction:column;gap:3px}.eta b{font-size:22px;color:var(--jade)}.eta span{font-size:13px;color:var(--muted)}.lecture{padding-top:0;gap:12px}.sticky{position:sticky;top:0;z-index:5;background:var(--ground);padding-top:max(8px,env(safe-area-inset-top));display:flex;flex-direction:column;gap:8px}.player{background:var(--jade);color:var(--on-jade);border-radius:18px;padding:12px 14px;display:flex;flex-direction:column;gap:8px}.ptitle{display:flex;justify-content:space-between;gap:10px;font-size:15px}.ptitle b{overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.ptitle span{opacity:.8;font-size:13px;flex:none}.prow{display:flex;align-items:center;gap:10px;font-size:13px}.play{width:38px;height:38px;flex:none;border-radius:50%;border:0;background:var(--on-jade);color:var(--jade);cursor:pointer;font-size:13px}.seek{flex:1;min-width:0;padding:0;border:0;background:none;accent-color:var(--on-jade)}.speed{flex:none;border:1px solid rgba(255,255,255,.4);background:none;border-radius:8px;padding:2px 6px;font-size:12px;cursor:pointer;color:var(--on-jade)}.tabs{display:flex;border-bottom:1px solid var(--line)}.tab{flex:1;background:none;border:0;border-bottom:2px solid transparent;padding:10px 2px 9px;font-size:14px;color:var(--muted);cursor:pointer}.tab.on{color:var(--jade);border-bottom-color:var(--jade);font-weight:700}.card{background:var(--paper);border:1px solid var(--line);border-radius:14px;padding:12px 14px;display:flex;flex-direction:column;gap:8px}.card h3{color:var(--jade)}.card h3.red{color:var(--seal)}.card p{margin:0;line-height:1.65}.toc{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:8px}.toc li{display:grid;grid-template-columns:64px 1fr;gap:8px;align-items:start}.stamp{background:var(--jade-soft);color:var(--jade);border:0;border-radius:6px;padding:1px 6px;font-size:12.5px;font-weight:600;cursor:pointer;justify-self:start}.stamp.red{background:var(--seal-soft);color:var(--seal)}.seg{display:flex;background:var(--paper);border:1px solid var(--line);border-radius:12px;padding:3px;gap:2px}.seg button{flex:1;border:0;background:none;border-radius:9px;padding:7px 2px;font-size:13px;color:var(--muted);cursor:pointer}.seg button.on{background:var(--jade-soft);color:var(--jade);font-weight:700}.paras{display:flex;flex-direction:column;gap:4px}.para{display:flex;flex-direction:column;gap:4px;padding:10px;border-radius:12px;cursor:pointer;border:1px solid transparent}.para:hover{background:var(--paper)}.para.cur{border-color:var(--jade);background:var(--jade-soft)}.para .t{font-size:12px;color:var(--jade);font-weight:600}.para .src{line-height:1.55}.para .tr{color:var(--muted);line-height:1.65}.view-tr .src,.view-src .tr{display:none}.view-tr .tr{color:var(--ink)}.terms{list-style:none;margin:0;padding:0;background:var(--paper);border:1px solid var(--line);border-radius:14px}.terms li{padding:11px 14px;display:flex;flex-direction:column;gap:3px}.terms li+li{border-top:1px solid var(--line)}.trm{font-size:16px}.py{color:var(--muted);font-size:13px}.legal{white-space:pre-wrap;font:15px/1.6 var(--f);background:var(--paper);border:1px solid var(--line);border-radius:14px;padding:14px;margin:0}@media(prefers-reduced-motion:reduce){.steps .now .dot{animation:none}.bar>span{transition:none}}