.login-page{min-height:100vh;display:flex;align-items:center;justify-content:center;padding:32px;background:linear-gradient(135deg,#eef2ff,#fde68a)}.login-card{width:100%;max-width:420px;background:#fffffffa;border-radius:14px;padding:28px;box-shadow:0 18px 45px #030a2014;text-align:center}.login-title{font-size:26px;font-weight:700;margin:0 0 6px;color:#0f172a}.login-sub{color:var(--muted);margin-bottom:18px}.login-form{display:flex;flex-direction:column;gap:12px;margin-top:8px}.login-form .input{font-size:15px}.login-form .login-submit{margin-top:6px}.login-info{margin-top:14px;font-size:13px;color:var(--muted)}.auth-page{min-height:100vh;display:flex;align-items:center;justify-content:center;padding:32px;background:linear-gradient(135deg,#6366f1,#a855f7)}.auth-card{width:100%;max-width:420px;background:#fff;border-radius:16px;padding:28px;box-shadow:0 20px 50px #00000026;text-align:center}.auth-title{font-size:26px;font-weight:700;margin-bottom:6px;color:#0f172a}.auth-subtitle{font-size:14px;color:#6b7280;margin-bottom:20px}.auth-form{display:flex;flex-direction:column;gap:12px}.auth-input{padding:10px 12px;border-radius:8px;border:1px solid #d1d5db;font-size:14px}.auth-input:focus{outline:none;border-color:#6366f1}.auth-button{margin-top:6px;padding:10px;border-radius:8px;border:none;background:#6366f1;color:#fff;font-weight:600;cursor:pointer}.auth-button:disabled{opacity:.6;cursor:default}.auth-button:hover:not(:disabled){background:#4f46e5}.auth-footer{margin-top:16px;font-size:13px;color:#6b7280}.auth-footer a{color:#6366f1;font-weight:500;text-decoration:none}.group-selector{display:flex;flex-direction:column;gap:4px;min-width:220px}.group-selector label{font-size:13px;color:var(--muted)}.group-selector select{padding:8px 10px;border-radius:10px;border:1px solid #e5e7eb;font-size:14px;background:#fff;cursor:pointer}.group-selector select:focus{outline:none;border-color:var(--accent)}:root{--bg: #f7f9fc;--card: #ffffff;--accent: #4f46e5;--muted: #64748b;--shadow: 0 12px 36px rgba(15,23,42,.06);--radius: 12px}.lecture-page{display:flex;gap:18px;align-items:stretch;padding:12px;height:calc(100vh - 64px);box-sizing:border-box;background:var(--bg)}.lecture-page.layout-wide .lecture-left{flex:3;min-width:0}.lecture-page.layout-wide .detected-panel{flex:1;max-width:420px}.lecture-left{display:flex;flex-direction:column;gap:12px;min-width:0;flex:1}.lecture-top-row{display:flex;gap:12px;align-items:center;justify-content:space-between;flex-shrink:0}.lecture-actions.unified{display:flex;gap:8px;align-items:center}.lecture-actions.unified .btn{height:40px;padding:0 14px;display:inline-flex;align-items:center;justify-content:center}.btn{padding:8px 12px;border-radius:8px;border:none;background:var(--card);color:var(--accent);cursor:pointer;font-weight:600;box-shadow:0 6px 18px #4f46e50f}.btn.primary{background:var(--accent);color:#fff}.btn.primary:hover{background:#4338ca}.btn.secondary{background:#ef4444;color:#fff}.btn.ghost{background:transparent;border:1px solid #e6e9ef;color:var(--muted)}.video-frame{background:#000;border-radius:var(--radius);overflow:hidden;position:relative;box-shadow:var(--shadow);display:flex;align-items:center;justify-content:center;flex:1;min-height:0}.video-frame.large{min-height:420px;display:flex}.video-img{width:100%;height:100%;object-fit:cover;display:block}.video-canvas{position:absolute;top:0;left:0;width:100%;height:100%;pointer-events:none}.video-placeholder{position:absolute;inset:0;display:flex;align-items:center;justify-content:center;color:#fff;font-size:18px;background:transparent}.detected-panel{display:flex;flex-direction:column;gap:12px;min-width:320px;max-width:420px;flex:1}.detected-header{display:flex;align-items:center;justify-content:space-between;background:var(--card);padding:12px;border-radius:10px;box-shadow:var(--shadow);flex-shrink:0}.detected-list{background:var(--card);padding:8px;border-radius:10px;overflow:auto;box-shadow:var(--shadow);flex:1;min-height:0}.detected-item{padding:10px;border-bottom:1px solid #f1f5f9}.detected-item:last-child{border-bottom:none}.detected-main{display:flex;justify-content:space-between;align-items:center;gap:8px}.detected-name{font-weight:600}.detected-time{color:var(--muted);font-size:13px}.detected-sub{font-size:12px;color:var(--muted);margin-top:6px}.badge{background:#eef2ff;color:var(--accent);padding:4px 8px;border-radius:999px;font-weight:700;font-size:13px}@media(max-width:980px){.lecture-page{flex-direction:column}.detected-panel{position:static;height:auto;max-width:none}.video-frame.large{min-height:320px;height:auto}}:root{--bg:#f6f8fb;--card:#ffffff;--accent:#3b82f6;--muted:#64748b;--radius:12px;--shadow:0 12px 30px rgba(15,23,42,.06)}.profile-card{background:var(--card);border-radius:var(--radius);padding:20px;box-shadow:var(--shadow);max-width:820px;width:100%;margin:0 auto;box-sizing:border-box}.profile-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:16px}.profile-title{margin:0;font-size:20px}.profile-sub{color:var(--muted);font-size:13px;margin-top:4px}.profile-att-summary{display:flex;align-items:center;gap:12px}.att-stats{display:flex;flex-direction:column;align-items:flex-end}.att-num{font-weight:700;font-size:18px;color:var(--accent)}.att-label{font-size:12px;color:var(--muted)}.att-muted{color:var(--muted);font-size:13px}.profile-body{display:flex;flex-direction:column;gap:12px}.field-label{font-size:13px;color:var(--muted);margin-bottom:4px}.input{padding:10px;border-radius:10px;border:1px solid #eef2f6;font-size:14px;outline:none}.input:focus{box-shadow:0 4px 14px #3b82f624;border-color:#3b82f699}.photos-row{display:flex;gap:12px;align-items:center;flex-wrap:wrap}.thumb{position:relative;width:112px;height:112px;border-radius:10px;overflow:hidden;background:#f3f6fb;border:1px solid #eef4ff;display:flex;align-items:center;justify-content:center}.thumb-img{width:100%;height:100%;object-fit:cover;display:block}.thumb-remove{position:absolute;top:6px;right:6px;width:28px;height:28px;border-radius:999px;border:none;background:#0009;color:#fff;font-weight:700;cursor:pointer;display:flex;align-items:center;justify-content:center}.thumb-badge{position:absolute;left:6px;bottom:6px;background:#0009;color:#fff;padding:4px 6px;border-radius:8px;font-size:12px}.upload-box{display:inline-flex;align-items:center;justify-content:center;width:112px;height:112px;border-radius:10px;border:2px dashed #e6eefc;background:linear-gradient(180deg,#fff,#fbfdff);cursor:pointer}.upload-box input{display:none}.upload-inner{display:flex;flex-direction:column;align-items:center;gap:6px;color:var(--muted)}.upload-plus{font-size:26px;color:var(--accent);line-height:1}.upload-text{font-size:13px}.actions-row{margin-top:8px}.btn{padding:10px 14px;border-radius:10px;border:none;background:var(--card);cursor:pointer;font-weight:700}.btn.primary{background:var(--accent);color:#fff;box-shadow:0 10px 30px #3b82f61f}.header-bar{position:sticky;top:0;z-index:90;background:linear-gradient(180deg,#fffffff5,#ffffffeb);border-bottom:1px solid rgba(16,24,40,.06);-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px);height:64px;display:flex;align-items:center}.header-inner{position:relative;width:100%;max-width:1400px;margin:0 auto;padding:0 18px;display:flex;align-items:center;box-sizing:border-box}.header-left{width:140px;min-width:80px}.header-center{position:absolute;left:1%;transform:translate(-50%);font-size:18px;font-weight:700;color:#0f172a;white-space:nowrap;text-align:center;pointer-events:none}.header-actions{margin-left:95%;display:flex;gap:12px;align-items:center}.header-user{font-size:14px;color:#0f172a;font-weight:600;padding:6px 8px;background:#4f46e50f;border-radius:8px}.logout-btn{appearance:none;-webkit-appearance:none;border:1px solid rgba(16,24,40,.06);background:#fff;color:#0f172a;padding:8px 10px;border-radius:8px;cursor:pointer;font-weight:600;box-shadow:0 6px 18px #0f172a0a}.logout-btn:hover{background:#f3f4ff;border-color:#4f46e51f}@media(max-width:720px){.header-inner{padding:0 10px}.header-center{font-size:15px}.header-left{width:90px}.header-user{display:none}}.admin-page{padding:20px}.admin-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:16px}.admin-main{display:flex;gap:16px}.admin-card{background:#fff;padding:16px;border-radius:10px;box-shadow:0 8px 28px #0000000f;width:480px}.admin-card h3{margin:0 0 12px}.admin-form{display:flex;flex-direction:column;gap:8px}.admin-form input,.admin-form select{padding:8px;border-radius:8px;border:1px solid #e6e9ef}:root{--bg: #f6f8fb;--card: #ffffff;--muted: #6b7280;--accent: #4f46e5;--accent-2: #4338ca;--danger: #ef4444;--radius: 12px;--shadow: 0 10px 30px rgba(15,23,42,.08)}*{box-sizing:border-box}html,body,#root{height:100%}body{margin:0;font-family:Inter,system-ui,-apple-system,Segoe UI,Roboto,Helvetica Neue,Arial;background:linear-gradient(180deg,#f3f4ff,#fff7f3);color:#0f172a;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}a{color:var(--accent);text-decoration:none}.container{max-width:1100px;margin:0 auto;padding:0 16px}.flex{display:flex}.items-center{align-items:center}.justify-center{justify-content:center}.text-center{text-align:center}.p-4{padding:16px}.p-6{padding:24px}.m-0{margin:0}.mt-2{margin-top:8px}label.block{display:block;margin-bottom:6px;color:var(--muted);font-size:13px}.input{width:100%;padding:10px;border-radius:10px;border:1px solid #e8eefb;background:#fff}.btn{display:inline-flex;align-items:center;justify-content:center;padding:10px 14px;border-radius:10px;border:none;background:var(--accent);color:#fff;font-weight:600;cursor:pointer}.btn.secondary{background:transparent;border:1px solid #dfe7ff;color:var(--accent)}.card{background:var(--card);border-radius:var(--radius);box-shadow:var(--shadow);padding:18px}.small{font-size:13px;color:var(--muted)}