:root{--bg:#f5f7f4;--surface:#fff;--text:#152019;--muted:#6a756c;--line:#e0e6dd;--green:#45ad4b;--green-dark:#2f7b35;--green-soft:#e9f6e6;--nav:#152019;--red:#d65353;--shadow:0 16px 45px rgba(27,47,28,.08)}
*{box-sizing:border-box}body{margin:0;font-family:Inter,system-ui,sans-serif;background:var(--bg);color:var(--text);line-height:1.55}a{text-decoration:none;color:inherit}button,input,select,textarea{font:inherit}.shell{min-height:100vh;display:grid;grid-template-columns:260px minmax(0,1fr)}.side{position:sticky;top:0;height:100vh;background:var(--nav);color:#fff;padding:24px 17px;display:flex;flex-direction:column}.logo{font-size:18px;font-weight:900;padding:7px 9px 24px;border-bottom:1px solid rgba(255,255,255,.08)}.logo span{color:#8bde91}.nav{display:grid;gap:5px;margin-top:20px}.nav a{min-height:44px;padding:0 12px;border-radius:11px;display:flex;align-items:center;gap:10px;color:#c8d4ca;font-size:13px;font-weight:700}.nav a:hover,.nav a.active{background:#243129;color:#fff}.ico{width:28px;height:28px;border-radius:8px;background:rgba(255,255,255,.06);display:grid;place-items:center}.side-user{margin-top:auto;background:rgba(255,255,255,.05);border:1px solid rgba(255,255,255,.07);border-radius:14px;padding:13px}.side-user strong{font-size:11px}.side-user small{display:block;font-size:9px;color:#91a095}.main{min-width:0;padding:28px 34px 46px}.top{display:flex;justify-content:space-between;align-items:center;gap:20px;margin-bottom:24px}.top h1{margin:0;font-size:29px;letter-spacing:-1.3px}.top p{margin:4px 0 0;color:var(--muted);font-size:12px}.chip{background:#fff;border:1px solid var(--line);border-radius:14px;padding:8px 11px;display:flex;gap:9px;align-items:center}.avatar{width:36px;height:36px;border-radius:50%;background:var(--green-soft);color:var(--green-dark);display:grid;place-items:center;font-weight:900}.chip strong{font-size:10px}.chip small{font-size:9px;color:var(--muted);display:block}.notice{padding:12px 14px;background:#edf8ea;color:#356b39;border-radius:11px;font-size:11px;margin-bottom:14px}.notice.error{background:#fff0f0;color:#9e3838}.grid-hero{display:grid;grid-template-columns:1.28fr .72fr;gap:18px}.continue{background:linear-gradient(135deg,#183624,#2b613c);border-radius:24px;color:#fff;padding:26px;min-height:250px}.overline{font-size:9px;letter-spacing:1.2px;color:#a7ddb0;font-weight:900}.continue h2{font-size:34px;line-height:1.04;letter-spacing:-1.8px;margin:12px 0 10px}.continue p{font-size:12px;color:#c5d6c9}.btn{display:inline-flex;align-items:center;justify-content:center;min-height:42px;padding:0 15px;border:0;border-radius:11px;background:var(--green);color:#fff;font-weight:900;font-size:11px;cursor:pointer}.btn.white{background:#fff;color:#183122}.btn.ghost{background:#fff;color:var(--text);border:1px solid var(--line)}.summary,.panel{background:#fff;border:1px solid var(--line);border-radius:20px;padding:20px}.summary h3,.panel h2{font-size:16px;margin:0 0 15px}.summary-row{display:flex;justify-content:space-between;border-bottom:1px solid var(--line);padding:11px 0}.summary-row:last-child{border-bottom:0}.summary-row span{font-size:10px;color:var(--muted)}.summary-row strong{font-size:15px}.quick-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:13px;margin:18px 0}.quick{background:#fff;border:1px solid var(--line);border-radius:17px;padding:17px}.quick .icon{width:38px;height:38px;border-radius:11px;background:var(--green-soft);color:var(--green-dark);display:grid;place-items:center;margin-bottom:15px}.quick strong{display:block;font-size:14px}.quick span{font-size:9px;color:var(--muted)}.content{display:grid;grid-template-columns:minmax(0,1.25fr) minmax(300px,.75fr);gap:18px}.course-list{display:grid;gap:11px}.course{display:grid;grid-template-columns:58px minmax(0,1fr) 130px auto;gap:13px;align-items:center;border:1px solid var(--line);border-radius:15px;padding:12px}.course-thumb{width:58px;height:58px;border-radius:13px;background:var(--green-soft);display:grid;place-items:center;color:var(--green-dark);font-weight:900}.course h3{font-size:12px;margin:0 0 3px}.course p{font-size:9px;color:var(--muted);margin:0}.bar{height:6px;border-radius:99px;background:#edf0eb;overflow:hidden}.bar span{display:block;height:100%;background:var(--green)}.progress-label{font-size:9px;color:var(--muted);display:flex;justify-content:space-between;margin-bottom:5px}.ai-card{background:linear-gradient(145deg,#f0f7ee,#fff);border:1px solid #dce8d8;border-radius:20px;padding:20px}.ai-card h2{font-size:18px;margin:0 0 6px}.ai-card p{font-size:11px;color:var(--muted)}.ai-chat{height:250px;overflow:auto;background:#fff;border:1px solid var(--line);border-radius:14px;padding:12px;display:grid;gap:9px}.bubble{max-width:88%;padding:9px 11px;border-radius:12px;font-size:11px;white-space:pre-wrap}.bubble.user{margin-left:auto;background:#e9f6e6}.bubble.bot{background:#f5f7f4}.ai-input{display:grid;grid-template-columns:1fr auto;gap:8px;margin-top:9px}.ai-input textarea{resize:none;min-height:46px;max-height:90px;border:1px solid var(--line);border-radius:11px;padding:10px}.auth{min-height:100vh;display:grid;grid-template-columns:1fr 1fr}.auth-left{padding:56px;background:linear-gradient(145deg,#edf7ea,#fafcf9);display:flex;flex-direction:column;justify-content:space-between}.auth-left h2{font-size:52px;line-height:1;letter-spacing:-3px;max-width:620px}.auth-left p{color:var(--muted);max-width:510px}.auth-brand{font-size:18px;font-weight:900}.auth-brand span{color:var(--green-dark)}.auth-right{background:#fff;padding:50px;display:flex;align-items:center}.form-wrap{width:min(620px,100%);margin:auto}.form-wrap h1{font-size:38px;letter-spacing:-2px;margin:0 0 7px}.form-wrap>p{font-size:12px;color:var(--muted);margin:0 0 22px}.form-grid{display:grid;grid-template-columns:1fr 1fr;gap:13px}.field{margin-bottom:13px}.field label{display:block;font-size:9px;font-weight:900;color:#647067;margin-bottom:6px}.field input,.field select,.field textarea{width:100%;min-height:45px;border:1px solid var(--line);border-radius:11px;padding:10px 12px;background:#fff}.form-submit{width:100%;min-height:48px;border:0;border-radius:12px;background:var(--green);color:#fff;font-weight:900}.course-page{display:grid;grid-template-columns:minmax(0,1fr) 340px;gap:18px}.lesson-list{background:#fff;border:1px solid var(--line);border-radius:20px;padding:20px}.module{font-size:10px;font-weight:900;color:#5d6d62;margin:18px 0 5px}.lesson{display:flex;justify-content:space-between;gap:16px;padding:13px 0;border-bottom:1px solid var(--line)}.lesson strong{font-size:11px}.lesson small{font-size:9px;color:var(--muted)}.badge{font-size:9px;padding:6px 9px;border-radius:999px;background:var(--green-soft);color:var(--green-dark);font-weight:900;height:max-content}.badge.locked{background:#fff3dc;color:#96661e}.access{background:#fff;border:1px solid var(--line);border-radius:20px;padding:20px}.video-shell{max-width:1180px;margin:auto;padding:26px}.video-card{background:#fff;border:1px solid var(--line);border-radius:20px;padding:17px}.player-wrap{position:relative;aspect-ratio:16/9;background:#0e110f;border-radius:15px;overflow:hidden}.yt-host{position:absolute;inset:0}.yt-host iframe{width:100%;height:100%;pointer-events:none}.player-controls{display:grid;grid-template-columns:auto 1fr auto auto;gap:10px;align-items:center;margin-top:12px}.player-controls button{border:1px solid var(--line);background:#fff;border-radius:10px;min-height:38px;padding:0 12px;font-size:10px;font-weight:800}.seek{width:100%}.chat-page{max-width:980px;margin:30px auto;padding:0 18px}.chat-layout{display:grid;grid-template-columns:300px 1fr;gap:16px}.chat-side,.chat-main{background:#fff;border:1px solid var(--line);border-radius:20px;padding:18px}.messages{height:420px;overflow:auto;display:grid;gap:9px;padding:5px}.msg{max-width:80%;padding:10px 12px;border-radius:13px;font-size:11px;white-space:pre-wrap}.msg.me{margin-left:auto;background:var(--green-soft)}.msg.admin{background:#f2f4f1}.chat-send{display:grid;grid-template-columns:1fr auto;gap:8px;margin-top:10px}.chat-send textarea{min-height:46px;border:1px solid var(--line);border-radius:11px;padding:10px;resize:none}
@media(max-width:1050px){.shell{grid-template-columns:88px 1fr}.side .logo,.nav a span:last-child,.side-user{display:none}.nav a{justify-content:center;padding:0;width:48px}.side{align-items:center}.grid-hero,.content,.course-page{grid-template-columns:1fr}.quick-grid{grid-template-columns:1fr 1fr}}
@media(max-width:760px){.shell{display:block}.side{position:fixed;left:0;right:0;bottom:0;top:auto;height:auto;z-index:100;padding:8px 10px}.nav{grid-template-columns:repeat(5,1fr)}.nav a{width:auto;min-height:50px}.main{padding:20px 15px 82px}.chip{display:none}.quick-grid{grid-template-columns:1fr 1fr}.course{grid-template-columns:52px 1fr auto}.progress-box{display:none}.auth{grid-template-columns:1fr}.auth-left{display:none}.auth-right{padding:26px 17px}.form-grid{grid-template-columns:1fr}.chat-layout{grid-template-columns:1fr}.video-shell{padding:16px 12px 82px}.player-controls{grid-template-columns:auto 1fr auto}.volume{display:none}}
@media(max-width:480px){.quick-grid{grid-template-columns:1fr}.top h1{font-size:24px}.continue h2{font-size:28px}.form-wrap h1{font-size:32px}}