:root{font-family:Inter,"Noto Sans SC","Microsoft YaHei",sans-serif;color:#20362a;background:#f7faf5;font-synthesis:none}*{box-sizing:border-box}body{margin:0;min-height:100dvh;background:radial-gradient(circle at 85% 0%,#e8f2e1,transparent 38%),#f7faf5}a{color:inherit;text-decoration:none}[hidden]{display:none!important}.site-header{max-width:1240px;margin:auto;padding:22px 32px;display:flex;align-items:center;justify-content:space-between;gap:15px}.brand{display:inline-flex;align-items:center;gap:9px;color:#204c31;font-size:22px;font-weight:850;letter-spacing:-.05em}.brand span{display:grid;place-items:center;width:36px;height:36px;border-radius:10px;background:#24563a;color:#d9efac;font-size:21px}.site-header nav{display:flex;gap:8px}.site-header nav a{padding:10px 12px;border-radius:9px;color:#58715d;font-size:13px;font-weight:700}.site-header nav a:hover{background:#e6f1e4}.corner-main{max-width:1240px;margin:26px auto 80px;padding:0 32px}.heading{max-width:750px;margin-bottom:32px}.eyebrow{color:#648c65;font-size:11px;font-weight:850;letter-spacing:.13em}.heading h1{margin:10px 0;color:#173d2a;font-size:clamp(32px,4vw,48px);letter-spacing:-.06em}.heading p{margin:0;color:#718474;font-size:15px;line-height:1.75}.notice{padding:34px;border:1px solid #e0e9dd;border-radius:20px;background:#fff;color:#67806e}.notice h2{color:#214b32}.notice p{line-height:1.7}.button{display:inline-flex;margin-top:12px;padding:12px 18px;border-radius:10px;background:#2e7349;color:#fff;font-size:14px;font-weight:750}.layout{display:grid;grid-template-columns:minmax(270px,330px) minmax(0,1fr);align-items:start;gap:20px}.rooms-panel,.room-panel{border:1px solid #e1e9df;border-radius:22px;background:#fff;box-shadow:0 18px 45px #284f2c0b}.rooms-panel{padding:22px;position:sticky;top:14px;max-height:calc(100dvh - 28px);display:flex;flex-direction:column}.panel-heading,.room-top,.room-toolbar{display:flex;align-items:center;justify-content:space-between;gap:12px}.panel-heading h2,.room-top h2{margin:5px 0 0;color:#1d4730;letter-spacing:-.04em}.panel-heading h2{font-size:21px}.room-top h2{font-size:26px}.online-pill{white-space:nowrap;border-radius:100px;background:#e7f3e5;padding:7px 10px;color:#357149;font-size:11px;font-weight:800}.online-pill::before{content:"";display:inline-block;width:6px;height:6px;margin-right:6px;border-radius:50%;background:#43a85e;vertical-align:2px}.search-label{display:block;margin:22px 0 7px;color:#758c79;font-size:12px;font-weight:750}.rooms-panel input{width:100%;border:1px solid #dce8dc;border-radius:10px;padding:11px 13px;font:inherit;font-size:13px;outline-color:#5d9b68}.room-list{margin-top:12px;overflow:auto;min-height:100px}.room-choice{display:block;width:100%;padding:13px 12px;border:0;border-radius:11px;background:transparent;color:#365741;text-align:left;font:inherit;cursor:pointer}.room-choice:hover,.room-choice[aria-current=true]{background:#eef6ea}.room-choice strong{display:block;font-size:13px;line-height:1.5}.room-choice span{display:flex;justify-content:space-between;gap:8px;margin-top:5px;color:#819183;font-size:11px}.room-choice em{font-style:normal;color:#438259}.room-panel{padding:30px}.lesson-card{margin-top:24px;padding:22px 24px;border-radius:16px;background:#eaf3e5}.lesson-card>span{color:#648765;font-size:11px;font-weight:800}.lesson-en{margin:13px 0 4px;color:#214a32;font-size:25px;font-weight:760;letter-spacing:-.03em}.lesson-zh{margin:0;color:#6d806e;font-size:13px}.lesson-card a{display:inline-block;margin-top:18px;color:#2d7746;font-size:13px;font-weight:850}.room-toolbar{margin-top:28px}.room-toolbar h3{margin:4px 0;color:#1e4730;font-size:20px}.room-toolbar label{color:#718674;font-size:12px;font-weight:750}.room-toolbar select{margin-left:6px;padding:8px;border:1px solid #dce7da;border-radius:8px;background:#fff;color:#3b6847;font:inherit}.participants{display:flex;flex-wrap:wrap;gap:8px;margin:17px 0 22px}.participant{padding:8px 10px;border-radius:9px;background:#f3f7f1;color:#4c6d53;font-size:12px}.participant b{font-weight:750}.participant span{margin-left:6px;color:#829686}.messages{height:310px;overflow:auto;padding:18px;border:1px solid #e4ece1;border-radius:14px;background:#fbfdf9}.empty{display:grid;place-items:center;height:100%;color:#8a9b8c;text-align:center;font-size:13px;line-height:1.7}.message{max-width:85%;margin-bottom:15px}.message.mine{margin-left:auto}.message-head{margin:0 0 5px;color:#829485;font-size:11px}.message.mine .message-head{text-align:right}.message-body{display:inline-block;max-width:100%;padding:10px 13px;border-radius:12px;background:#edf4e9;color:#2d5136;font-size:13px;line-height:1.6;white-space:pre-wrap;overflow-wrap:anywhere}.message.mine .message-body{background:#2f754a;color:#fff}.message.mine{text-align:right}.composer{margin-top:20px}.composer>label{display:block;margin-bottom:9px;color:#5a785f;font-size:12px;font-weight:750}.composer>div{display:flex;align-items:stretch;gap:9px}.composer textarea{flex:1;min-width:0;resize:vertical;border:1px solid #dce8dc;border-radius:10px;padding:11px 13px;outline-color:#5d9b68;font:inherit;font-size:13px}.composer button{min-width:72px;border:0;border-radius:10px;background:#2e7349;color:#fff;font:inherit;font-size:13px;font-weight:800;cursor:pointer}.composer button:hover{background:#245e3b}.composer button:disabled{opacity:.6;cursor:wait}.composer p{min-height:18px;margin:8px 0 0;color:#8a998b;font-size:11px}@media(max-width:800px){.layout{grid-template-columns:1fr}.rooms-panel{position:static;max-height:none}.room-list{display:flex;overflow-x:auto;min-height:0;gap:5px}.room-choice{min-width:190px}.corner-main{padding:0 18px}.site-header{padding:18px}.room-panel{padding:22px}}@media(max-width:520px){.heading{margin-bottom:24px}.heading h1{font-size:34px}.room-top{align-items:start}.room-top h2{font-size:22px}.lesson-en{font-size:21px}.room-toolbar{align-items:start;flex-direction:column}.messages{height:280px}.message{max-width:95%}}