:root{color:#263831;background:#f5f7f6;font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif}
*{box-sizing:border-box}body{margin:0;background:#f5f7f6}a{color:inherit;text-decoration:none}
button,select{font:inherit}
.top{background:#fff;border-bottom:1px solid #e3e9e5}
.top-in{max-width:1180px;margin:auto;padding:14px 24px;display:flex;align-items:center;gap:18px;justify-content:space-between}
.brand{display:flex;gap:10px;align-items:center;font-weight:750;font-size:15px;white-space:nowrap}
.brandmark{background:#24634f;color:#fff;border-radius:10px;width:34px;height:36px;display:grid;place-items:center;font-size:17px}
.brand small{display:block;font-weight:400;color:#89958d;font-size:10px;margin-top:3px;letter-spacing:1px}
.top-links{display:flex;gap:6px;font-size:13px}.top-links a{padding:8px 12px;border-radius:8px;color:#5f7368}.top-links a:hover,.top-links a.on{background:#eaf2ed;color:#23604b}
.wrap{max-width:1180px;margin:auto;padding:22px 24px 50px}
.crumb{font-size:12px;color:#8d9a92;margin-bottom:18px;display:flex;flex-wrap:wrap;gap:6px}.crumb a{color:#5f7a68}.crumb a:hover{text-decoration:underline}.crumb b{color:#2f4a3c;font-weight:600}
.layout{display:grid;grid-template-columns:minmax(0,560px) minmax(0,1fr);gap:32px;align-items:start}
.movie{position:relative;aspect-ratio:3/4;background:#f0ecdf;border-radius:12px;overflow:hidden;box-shadow:0 14px 40px #233a2722;border:1px solid #e3ddc8}
.movie canvas{display:block;width:100%;height:100%}
.sub{position:absolute;bottom:4.6%;left:6%;right:6%;color:#24464a;text-align:center;font-weight:600;font-size:clamp(13px,1.7vw,19px);line-height:1.6;min-height:3.3em;display:flex;align-items:center;justify-content:center;pointer-events:none;text-wrap:balance}
.sub.hidden{visibility:hidden}
.big-play{position:absolute;left:50%;top:50%;transform:translate(-50%,-50%);border:0;border-radius:40px;background:#db7849;color:#fff9e9;font-size:17px;padding:15px 28px;cursor:pointer;box-shadow:0 10px 30px #0003}
.big-play[hidden]{display:none}
.controls{background:#fff;border:1px solid #e1e8e3;border-radius:12px;padding:12px 16px;margin-top:14px}
.seek{width:100%;accent-color:#20624e;cursor:pointer;display:block;margin:4px 0 12px}
.transport{display:flex;align-items:center;gap:8px;flex-wrap:wrap}
.transport button{border:1px solid #d6e0db;background:#fff;color:#344c40;border-radius:8px;padding:8px 12px;font-size:12px;cursor:pointer}
.transport button:hover{background:#f0f5f2}
.transport .primary{background:#20624e;border-color:#20624e;color:#fff;min-width:64px}
.time{font:12px ui-monospace,monospace;color:#6d7f74;margin-right:auto}
.transport select{border:1px solid #d6e0db;border-radius:8px;padding:7px;font-size:12px;background:#fff;color:#344c40}
button:focus-visible,select:focus-visible,input:focus-visible,a:focus-visible{outline:2px solid #a5c3af;outline-offset:3px}
.kicker{font-size:11px;letter-spacing:2px;color:#869c8b;font-weight:600}
.side h1{font-size:30px;margin:8px 0 4px;letter-spacing:1px}
.subt{color:#5e8a77;margin:0;font-size:13px;line-height:1.7}
.card{background:#fff;border:1px solid #e1e8e3;border-radius:12px;padding:18px 20px;margin-top:16px}
.card h2{font-size:14px;margin:0 0 10px;color:#2f4a3c}
.notes{font-size:13px;line-height:1.85;color:#4f6158}
.notes h3{font-size:13px;color:#b0643e;margin:16px 0 4px}.notes h3:first-child{margin-top:0}
.notes p{margin:0 0 8px}.notes b{color:#23604b}
.notes table{border-collapse:collapse;width:100%;font-size:12px;margin:6px 0 10px}
.notes td,.notes th{border-bottom:1px solid #edf1ed;padding:7px 6px;text-align:left;vertical-align:top}
.notes th{color:#7d8f84;font-weight:500;background:#f7f9f6}
.notes .ok{color:#2f7a5d}.notes .no{color:#a64b3e}
.notes .foot{font-size:11px;color:#8b978f}
.tree,.tree ul{list-style:none;margin:0;padding:0}
.tree ul{padding-left:16px;border-left:1px dashed #d3ddd6;margin:4px 0 8px 8px}
.tree li{margin:2px 0}
.tree a,.tree span.node{display:inline-flex;align-items:center;gap:7px;padding:5px 8px;border-radius:7px;font-size:13px;color:#43584c}
.tree a:hover{background:#f0f5f2}
.tree a.cur{background:#eaf2ed;color:#1f5a46;font-weight:650}
.tag{font-size:10px;padding:2px 6px;border-radius:4px;background:#f2f5ee;color:#63845c;white-space:nowrap}
.tag.g{background:#fbeee6;color:#b0643e}.tag.q{background:#e9eef6;color:#4f6c95}
.tree .topic{font-weight:700;color:#2f4a3c}
.rel{display:flex;flex-wrap:wrap;gap:8px}
.rel a{border:1px solid #d6e0db;background:#fff;border-radius:20px;padding:6px 12px;font-size:12px;color:#344c40}
.rel a:hover{background:#eaf2ed}
.rel-label{font-size:11px;color:#8b978f;margin:10px 0 6px}
details summary{cursor:pointer;font-size:13px;color:#5f7368}
details .body{font-size:13px;line-height:1.9;color:#5b6d63;padding-top:8px}details .body p{margin:0}
.foot-note{font-size:11px;color:#9aa59e;margin-top:22px;line-height:1.8}
/* 入口页 */
.hero h1{font-size:30px;margin:6px 0 8px}.hero p{color:#6f7f75;line-height:1.8;font-size:14px;margin:0;max-width:720px}
.how{display:flex;flex-wrap:wrap;gap:10px;margin:18px 0 6px}.how span{font-size:12px;color:#5f7a68;border:1px solid #dce6d9;background:#fff;border-radius:20px;padding:6px 12px}
.topic-card{background:#fff;border:1px solid #e1e8e3;border-radius:14px;padding:22px;margin-top:22px}
.topic-card>h2{margin:0 0 4px;font-size:20px}.topic-card>p{margin:0 0 16px;color:#7b8a80;font-size:13px}
.groups{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px}
.group{border:1px solid #e6ebe7;border-radius:12px;padding:16px;background:#fbfcfb;display:flex;flex-direction:column;gap:10px}
.group .g-head{display:flex;justify-content:space-between;align-items:center;gap:8px}
.group h3{margin:0;font-size:17px}
.group .play{background:#20624e;color:#fff;border-radius:8px;padding:7px 11px;font-size:12px;white-space:nowrap}
.group .play:hover{background:#164f3e}
.group .lbl{font-size:11px;color:#8b978f;letter-spacing:1px}
.chips{display:flex;flex-wrap:wrap;gap:6px}
.chips a{border:1px solid #d6e0db;background:#fff;border-radius:8px;padding:6px 10px;font-size:13px}
.chips a:hover{background:#eaf2ed;border-color:#b9d1c2}
.chips a small{display:block;font-size:10px;color:#8b978f}
.chips.q a{border-color:#d5deea;background:#f7f9fd}
@media(max-width:900px){.layout{display:block}.side{margin-top:22px}.groups{grid-template-columns:1fr}}
@media(max-width:600px){.top-in{padding:12px 16px}.wrap{padding:16px 16px 40px}.brand small{display:none}.top-links a{padding:6px 8px;font-size:12px}.side h1{font-size:25px}.sub{font-size:clamp(13px,3.6vw,19px)}}
/* 搜索 */
.search-bar{display:flex;gap:10px;margin:18px 0 10px;max-width:680px}
.search-bar input{flex:1;min-width:0;padding:13px 15px;border:1px solid #cfdcd4;border-radius:10px;font-size:16px;background:#fff;color:#263831}
.search-bar input:focus{outline:2px solid #a5c3af;outline-offset:1px}
.search-bar button{border:0;background:#20624e;color:#fff;border-radius:10px;padding:0 22px;font-size:15px;cursor:pointer}
.search-bar button:hover{background:#164f3e}
.hot{display:flex;flex-wrap:wrap;gap:6px;align-items:center;font-size:12px;color:#8b978f}
.hot #hot{display:flex;flex-wrap:wrap;gap:6px}
.chip{border:1px solid #d6e0db;background:#fff;border-radius:16px;padding:5px 11px;font-size:12px;color:#435a4d;cursor:pointer}
.chip:hover{background:#eaf2ed}
.status{font-size:13px;color:#5f7368;margin:16px 0 8px}.status.error{color:#a64b3e}.status.empty{color:#8b7a5e}
.s-layout{display:grid;grid-template-columns:minmax(0,340px) minmax(0,1fr);gap:22px;align-items:start;margin-top:8px}
.results{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:8px}
.res{width:100%;text-align:left;border:1px solid #e1e8e3;background:#fff;border-radius:10px;padding:11px 13px;cursor:pointer;display:block}
.res:hover{border-color:#b9d1c2}.res.on{border-color:#20624e;background:#f2f8f4}
.res-top{display:flex;align-items:baseline;gap:8px;flex-wrap:wrap}.res-top b{font-size:16px;color:#23382e}
.res .py{font-size:12px;color:#5e8a77}.res .pre{display:block;font-size:12px;color:#77867d;margin-top:5px;line-height:1.6}
.tag.v{background:#fbeee6;color:#b0643e}
.more{margin-top:10px;width:100%;border:1px solid #d6e0db;background:#fff;border-radius:10px;padding:10px;cursor:pointer;color:#344c40}
.detail{background:#fff;border:1px solid #e1e8e3;border-radius:14px;padding:22px 24px;min-height:200px}
.detail-empty p,.detail .muted{color:#8b978f;font-size:13px}
.d-head{display:flex;align-items:baseline;gap:12px;flex-wrap:wrap}.d-head h2{margin:0;font-size:28px;letter-spacing:1px}.d-head .py{color:#5e8a77;font-size:14px}
.vids{display:flex;flex-wrap:wrap;gap:8px;margin:14px 0 4px}
.vid{display:inline-block;background:#db7849;color:#fff;border-radius:8px;padding:7px 12px;font-size:12px}
.vid:hover{background:#c4663b}.vid.g{background:#20624e}.vid.g:hover{background:#164f3e}
.d-sec{margin-top:18px}.d-sec h3{font-size:13px;color:#b0643e;margin:0 0 6px}.d-sec p{margin:0;font-size:14px;line-height:1.85;color:#3f5248}
.hints{margin:0;padding-left:18px;font-size:14px;line-height:1.85;color:#3f5248}.hints small{color:#8b978f;margin-left:4px}
.groups-d{display:flex;flex-direction:column;gap:10px}
.gcard{border:1px solid #e6ebe7;background:#fbfcfb;border-radius:10px;padding:12px 14px}
.g-top{display:flex;gap:8px;align-items:center;flex-wrap:wrap}.g-top b{font-size:14px}
.gcard .dim{font-size:12px;color:#6f7f75;margin:6px 0 4px;line-height:1.7}
.members{list-style:none;margin:6px 0 4px;padding:0;display:flex;flex-direction:column;gap:4px}
.members li{font-size:13px;line-height:1.7;color:#4f6158;display:flex;gap:8px;align-items:baseline}
.members li b,.members li .link{white-space:nowrap;min-width:5.2em}
.members li.me b{color:#b0643e}
.gcard .vid{margin-top:8px}
.link{border:0;background:none;color:#20624e;padding:0;font:inherit;cursor:pointer;text-decoration:underline;text-underline-offset:3px}
.examples{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:10px}
.examples li{border-left:3px solid #e2c48f;padding:2px 0 2px 12px}
.examples p{margin:0 0 3px}.examples small{color:#8b978f;font-size:12px}.examples a{color:#20624e;text-decoration:underline}
.hub-search{margin-top:6px}
@media(max-width:900px){.s-layout{grid-template-columns:1fr}}
.top-links a{white-space:nowrap}@media(max-width:600px){.brand>span:last-child{display:none}.top-in{gap:10px}}
@media(max-width:900px){.detail{order:-1;min-height:0}.detail-empty p{margin:0}}

/* B站视频在站内播放，沿用竖屏课程画布。 */
.bilibili-player{display:block;width:100%;aspect-ratio:3/4;border:0;border-radius:12px;background:#111}

/* MCP词条与辨析详情共用排版，保留文本中的换行。 */
.idiom-sidebar{min-width:0;padding:20px}.idiom-sidebar h1{margin:0 0 8px}.d-sec p{white-space:pre-line;overflow-wrap:anywhere}.d-sec details{margin-top:12px}.d-sec summary{cursor:pointer;color:#20624e;font-size:13px}.d-sec details>.gcard{margin-top:10px}.detail a{overflow-wrap:anywhere}.groups-d{min-width:0}.d-sec .d-sec h3{color:#526b5b}.idiom-sidebar>p{color:#5e8a77}