:root{--ink:#183b35;--green:#18624f;--mint:#e7f1eb;--gold:#d6a958;--muted:#64746d;--line:#dce5df;--bg:#f4f6f2;--white:#fff;--red:#b33831;font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei",sans-serif;color:var(--ink);background:var(--bg);font-size:16px}*{box-sizing:border-box}body{margin:0}.topbar{min-height:88px;max-width:1200px;margin:auto;padding:20px 28px;display:flex;align-items:center;justify-content:space-between;gap:12px}.brand{display:flex;align-items:center;gap:12px;color:var(--ink);text-decoration:none;font-weight:750;font-size:21px}.logo{display:grid;place-items:center;width:44px;height:44px;background:var(--ink);color:#fff;border-radius:13px;font-size:25px}.brand small{display:block;font-size:11px;letter-spacing:2px;font-weight:400;margin-top:5px;color:var(--muted)}#account{display:flex;gap:10px;align-items:center;font-size:13px;flex-wrap:wrap}main{max-width:1144px;margin:12px auto 60px;padding:0 24px}.card{background:var(--white);border:1px solid var(--line);border-radius:20px;padding:26px;margin-bottom:20px;box-shadow:0 7px 25px #183b3505}.login-layout{display:grid;grid-template-columns:1.1fr 1fr;gap:48px;align-items:center;min-height:65vh}.intro{padding:30px 15px}.eyebrow{font-size:12px;letter-spacing:3px;color:var(--green);font-weight:700}.intro h1{font-size:48px;line-height:1.3;letter-spacing:-2px;max-width:500px;margin:25px 0}.intro p{line-height:1.9;color:var(--muted)}.intro .number{font-size:44px;font-weight:700;display:block;line-height:1.3}.intro .features{display:flex;gap:40px;margin-top:45px;font-size:13px}.auth-card{padding:34px;max-width:460px;width:100%;justify-self:end}h1{font-size:30px;line-height:1.4;margin:0 0 12px}h2{font-size:21px;margin:0 0 16px}h3{font-size:17px;line-height:1.5;margin:0 0 10px}p{line-height:1.7}.muted{color:var(--muted);font-size:14px}.help{font-size:13px;color:var(--muted);line-height:1.7}label{display:block;font-size:14px;margin:16px 0 7px}input,select,button{font:inherit}input,select{width:100%;min-height:46px;border:1px solid #cbd8d0;border-radius:10px;padding:10px 12px;background:#fff;color:var(--ink)}input:focus,select:focus,button:focus-visible,a:focus-visible{outline:3px solid #c3dfd0;outline-offset:2px}button,.button{cursor:pointer;display:inline-flex;justify-content:center;align-items:center;gap:6px;text-decoration:none;border:0;border-radius:10px;background:var(--green);color:white;padding:12px 18px;font-size:14px;min-height:44px}button:disabled{opacity:.55;cursor:wait}button.secondary,.button.secondary{background:var(--mint);color:var(--ink)}button.danger{background:#fbece9;color:var(--red)}button.small{padding:6px 10px;font-size:12px;min-height:34px}.full{width:100%;margin-top:25px}.error{color:var(--red);font-size:14px;line-height:1.6}.success{color:var(--green)}.hero{background:var(--ink);color:white;border-radius:24px;padding:32px;margin-bottom:26px;display:flex;justify-content:space-between;align-items:center;gap:25px}.hero p{color:#c6ded2;margin:5px 0}.hero .eyebrow{color:var(--gold)}.hero h1{margin:10px 0}.pill{display:inline-block;background:var(--mint);color:var(--green);border-radius:20px;padding:5px 10px;font-size:12px;white-space:nowrap}.hero .pill{background:#ffffff16;color:#deede5}.row{display:flex;gap:12px;align-items:center;flex-wrap:wrap}.between{justify-content:space-between}.grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:20px}.track-title{display:flex;align-items:center;justify-content:space-between;margin:28px 0 16px}.subject{margin:22px 0 12px;border-bottom:1px solid var(--line);padding-bottom:8px;font-size:16px}.lesson{display:flex;align-items:center;gap:14px;padding:16px 0;border-bottom:1px solid #edf1ed}.lesson:last-child{border:0}.lesson-icon{display:grid;place-items:center;flex-shrink:0;border-radius:12px;background:var(--mint);width:43px;height:43px;color:var(--green)}.lesson-info{flex:1;min-width:0}.lesson-info h3{font-size:15px;margin-bottom:5px}.lesson-info p{font-size:12px;color:var(--muted);margin:0}.bar{height:5px;background:#e8eee9;border-radius:8px;overflow:hidden;margin-top:9px}.bar progress{width:100%;height:5px;display:block;border:0;appearance:none}.bar progress::-webkit-progress-bar{background:#e8eee9}.bar progress::-webkit-progress-value{background:var(--green)}.empty{text-align:center;color:var(--muted);padding:40px 15px;line-height:1.8}.tabs{display:flex;gap:8px;margin-bottom:22px;overflow:auto;white-space:nowrap}.tabs button{background:transparent;color:var(--muted)}.tabs button.active{background:var(--ink);color:#fff}.fields{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:0 18px}.table-wrap{overflow:auto}table{width:100%;border-collapse:collapse;min-width:600px;font-size:13px}td,th{text-align:left;padding:14px 12px;border-bottom:1px solid var(--line);line-height:1.6;vertical-align:top}th{font-weight:600;color:var(--muted);background:#f6f8f4}td input,td select{min-height:38px;min-width:100px;font-size:13px}.notice{background:#fff8e9;border:1px solid #eadbb6;padding:14px 18px;border-radius:12px;font-size:13px;line-height:1.8;margin:16px 0}video{width:100%;max-height:65vh;display:block;background:#071a16;border-radius:15px}.player-card{max-width:900px;margin:auto}.player-toolbar{display:flex;align-items:center;justify-content:space-between;gap:15px;margin-top:18px}.player-toolbar select{width:110px}.upload-progress{width:100%;margin:20px 0}#toast{position:fixed;bottom:28px;left:50%;transform:translateX(-50%);background:#173c35;color:white;border-radius:12px;padding:14px 22px;box-shadow:0 8px 30px #0002;max-width:90%;z-index:10;display:none}.stats{display:flex;gap:30px;flex-wrap:wrap}.stat strong{font-size:30px;display:block}.stat span{font-size:12px;color:var(--muted)}footer{text-align:center;color:#7a8881;font-size:12px;padding:25px}.hidden{display:none!important}.back{margin-bottom:18px}a{color:var(--green)}.audit{font-size:12px;color:var(--muted);line-height:2}details summary{cursor:pointer}#import-preview{max-height:360px;overflow:auto}.reset-output{font-family:monospace;font-size:22px;user-select:all;background:var(--mint);padding:20px;border-radius:12px}.filterbar{display:flex;gap:10px;align-items:end;flex-wrap:wrap;margin-bottom:20px}.filterbar>div{flex:1;min-width:140px}dialog{border:1px solid var(--line);border-radius:20px;padding:28px;max-width:90%;width:440px}dialog::backdrop{background:#122a2455}
@media(max-width:740px){.topbar{padding:16px 18px;min-height:75px}.brand{font-size:17px}.brand small{font-size:9px;letter-spacing:1px}.logo{width:37px;height:37px}main{padding:0 16px;margin-top:6px}.login-layout{display:block;min-height:auto}.intro{padding:18px 4px}.intro h1{font-size:32px;letter-spacing:-1px;margin:15px 0}.intro p{font-size:14px;margin:0}.intro .features{display:none}.auth-card{max-width:none;padding:24px;margin-top:12px}.card{padding:20px;border-radius:16px}.hero{padding:24px;display:block}.hero h1{font-size:25px}.hero .pill{margin-top:12px}.grid{grid-template-columns:1fr;gap:0}.fields{grid-template-columns:1fr}.lesson{gap:10px}.lesson button{padding:10px 12px;font-size:12px}.lesson-icon{width:35px;height:35px}.player-card{padding:15px}.player-toolbar{flex-wrap:wrap}.tabs{margin:0 0 15px}.tabs button{padding:10px 14px}.stats{gap:20px}.intro .eyebrow{font-size:10px}#account .username{display:none}.hero p{font-size:13px}}

.upload-state{margin-top:18px;padding:18px;background:#edf4ef;border:1px solid #cbded2;border-radius:12px}.upload-state strong{font-size:15px}.upload-state.failed{background:#fff3ef;border-color:#efc6bc}.upload-state.success{background:#e6f4e9;border-color:#a9d2b5}.upload-state .upload-progress{height:12px;accent-color:var(--green);margin:16px 0 4px}.upload-state p{margin:8px 0}.upload-state button{margin-top:10px}

/* 学员与管理员共用的简洁移动登录布局 */
body.login-page{min-height:100vh;min-height:100svh;display:flex;flex-direction:column;background:#f5f7f4}
.login-page .topbar{display:none}.login-page main{flex:1;display:flex;align-items:center;justify-content:center;width:100%;margin:0 auto;padding:28px 18px}.login-page footer{padding:8px 16px 24px;font-size:12px}
.compact-login{width:100%;max-width:410px;margin:0;padding:32px 28px;border-radius:22px;box-shadow:0 12px 45px #183b3506}.login-brand{display:flex;align-items:center;gap:10px;margin-bottom:25px;font-size:19px;font-weight:700}.login-brand .logo{width:38px;height:38px;font-size:23px;border-radius:11px}.compact-login h1{font-size:22px;line-height:1.5;margin:0 0 5px;letter-spacing:0}.login-subtitle{color:var(--muted);font-size:14px;margin:0 0 25px}.compact-login label{margin-top:19px}.compact-login input{min-height:50px;font-size:16px;border-radius:11px;background:#fcfdfb}.compact-login .full{min-height:50px;font-size:16px;font-weight:600;margin-top:25px}.password-field{position:relative}.password-field input{padding-right:62px}.password-field button{position:absolute;right:4px;top:3px;padding:8px 11px;min-height:44px;background:transparent;color:var(--muted);font-size:13px}.login-tip{font-size:12px;line-height:1.8;color:var(--muted);margin:18px 0 0}.login-contact{text-align:center;font-size:12px;color:var(--muted);margin:16px 0 0}.compact-login .error:empty{display:none}
@media(max-width:480px){.compact-login{padding:27px 23px;border-radius:19px}.compact-login h1{font-size:21px}.login-page main{padding:24px 16px}.login-subtitle{margin-bottom:22px}}