:root{--bg:#f5f7fb;--panel:#fff;--line:#e8edf3;--text:#132033;--muted:#718096;--accent:#6c5ce7;--accent2:#8c7dff;--navy:#14263d;--gold:#b98b39;--shadow:0 16px 40px rgba(17,30,52,.08)}*{box-sizing:border-box}body{margin:0;font-family:Inter,"PingFang SC","Microsoft YaHei",sans-serif;background:var(--bg);color:var(--text)}button,input{font:inherit}button{cursor:pointer}#app{max-width:430px;min-height:100vh;margin:0 auto;background:var(--bg)}.page{padding:18px 18px 110px}.hero{padding:22px;border-radius:26px;background:linear-gradient(135deg,#4338ca,#6d63f6 60%,#9b92ff);color:#fff;box-shadow:0 18px 40px rgba(73,62,208,.24)}.hero h1{margin:10px 0 8px;font-size:28px;line-height:1.25}.hero p{margin:0 0 18px;color:rgba(255,255,255,.8);font-size:14px}.badge{display:inline-flex;padding:6px 10px;border-radius:999px;background:rgba(255,255,255,.16);font-size:12px}.primary{border:0;border-radius:14px;padding:12px 16px;background:#fff;color:#4f46e5;font-weight:700}.section-head{display:flex;justify-content:space-between;align-items:center;margin:22px 0 12px}.section-head h2{margin:0;font-size:18px}.link{border:0;background:none;color:var(--muted)}.card{background:var(--panel);border-radius:22px;box-shadow:var(--shadow)}.course-card{display:flex;gap:14px;padding:14px}.cover{width:110px;height:118px;flex:0 0 110px;border-radius:18px;padding:12px;background:linear-gradient(145deg,#ffc689,#ff8567);color:#fff;position:relative;overflow:hidden}.cover.alt{background:linear-gradient(145deg,#8ed6d1,#3d9ca8)}.cover.gold{background:linear-gradient(145deg,#8b7b4f,#3d3426)}.cover::after{content:'A+';position:absolute;right:10px;bottom:4px;color:rgba(255,255,255,.36);font:800 38px/1 Georgia}.cover span{display:inline-flex;padding:4px 7px;border-radius:8px;background:rgba(255,255,255,.9);color:#d56447;font-size:10px}.course-main{flex:1;min-width:0}.course-main h3{margin:6px 0 8px;font-size:17px;line-height:1.35}.course-main p{margin:0 0 14px;color:var(--muted);font-size:12px}.progress{height:6px;background:#eceff6;border-radius:999px;overflow:hidden}.progress i{display:block;height:100%;background:linear-gradient(90deg,var(--accent),var(--accent2))}.progress-row{display:flex;justify-content:space-between;margin-top:8px;color:var(--muted);font-size:11px}.progress-row b{color:var(--accent)}.list{display:grid;gap:12px}.detail-hero,.detail-progress,.lesson-list,.info-box,.comment-box,.security-box,.ticket-box,.device-box,.summary-box{padding:18px}.detail-hero{display:flex;gap:14px}.detail-heading h1{margin:10px 0 8px;font-size:24px;line-height:1.3}.detail-heading p{margin:0;color:var(--muted);font-size:12px}.detail-progress{margin-top:14px;background:var(--navy);color:#fff}.detail-progress p{margin:10px 0 0;color:#c4ced8;font-size:12px}.detail-progress strong{display:block;margin-top:6px;font-size:20px}.detail-progress .progress{margin-top:14px;background:#344055}.detail-progress .progress i{background:linear-gradient(90deg,#7b63ea,#9f91ff)}.lesson-item{display:flex;align-items:center;gap:12px;padding:15px 0;border-bottom:1px solid var(--line)}.lesson-item:last-child{border:0}.lesson-item.current{background:#f4f1ff;margin:0 -18px;padding:15px 18px;border-left:4px solid var(--accent)}.lesson-no{width:38px;height:38px;display:grid;place-items:center;border-radius:12px;background:#eef1f6;color:#616d82;font-weight:800;font-size:11px}.lesson-item.current .lesson-no{background:var(--accent);color:#fff}.lesson-body{flex:1}.lesson-body h3{margin:0 0 6px;font-size:14px}.lesson-body p{margin:0;color:var(--muted);font-size:11px}.mini-btn{border:0;border-radius:10px;padding:8px 12px;background:#eef1f6;color:#4f5d73}.lesson-item.current .mini-btn{background:var(--accent);color:#fff}.video-shell{overflow:hidden;border-radius:20px;background:#0a0d12}.video-box{width:100%;aspect-ratio:16/9;border:0;background:#000}.comment-head,.menu-row,.device-row,.ticket-row,.security-row{display:flex;justify-content:space-between;align-items:center}.comment-form{display:flex;gap:8px;margin-top:14px}.comment-form input{flex:1;min-width:0;border:0;border-radius:12px;background:#f3f5f8;padding:12px}.comment-item{padding:14px 0;border-bottom:1px solid var(--line)}.comment-item:last-child{border:0}.comment-item b{color:var(--accent);font-size:12px}.comment-item p{margin:6px 0 0;color:#425466;font-size:13px;line-height:1.5}.bottom-nav{position:fixed;left:50%;bottom:10px;transform:translateX(-50%);width:min(394px,calc(100vw - 20px));display:grid;grid-template-columns:repeat(3,1fr);padding:10px 14px;border:1px solid var(--line);border-radius:24px;background:rgba(255,255,255,.94);backdrop-filter:blur(12px);box-shadow:0 12px 26px rgba(16,28,49,.14)}.nav-btn{border:0;background:none;color:#8a93a3;padding:6px 4px}.nav-btn.active{color:var(--accent);font-weight:700}.menu-panel{padding:6px 16px}.menu-row{padding:16px 0;border-bottom:1px solid var(--line)}.menu-row:last-child{border:0}.icon-box{width:34px;height:34px;display:grid;place-items:center;border-radius:12px;background:#f1efff;color:#5c54d6;margin-right:12px}.menu-left{display:flex;align-items:center}.menu-main h3{margin:0 0 4px;font-size:15px}.menu-main p{margin:0;color:var(--muted);font-size:11px}.status{font-size:11px;color:var(--muted)}.status.warn{color:#e46a47}.security-grid,.summary-grid{display:grid;gap:10px}.security-row,.device-row,.ticket-row{padding:14px 0;border-bottom:1px solid var(--line)}.security-row:last-child,.device-row:last-child,.ticket-row:last-child{border:0}.subtle{color:var(--muted);font-size:12px}.tabset{display:flex;gap:8px;margin-bottom:12px}.tabset button{border:0;border-radius:16px;padding:8px 12px;background:#ebedf3;color:#657084}.tabset button.active{background:var(--navy);color:#fff}.wide-btn{width:100%;border:0;border-radius:14px;padding:13px;background:var(--navy);color:#fff;font-weight:700}.safe-box{border:1px solid #e9defd;background:#faf8ff}.spacer{height:10px}

.desktop-brand,.nav-label,.desktop-support,.desktop-user,.desktop-topbar{display:none}

@media (min-width:1024px){
  body{background:#f4f6fa}
  #app{max-width:none;min-height:100vh;margin:0;background:transparent}
  .page{min-height:100vh;padding:104px 48px 64px 304px;max-width:1600px;margin:0 auto}
  .bottom-nav{position:fixed;z-index:20;left:0;top:0;bottom:0;transform:none;width:256px;display:flex;flex-direction:column;padding:28px 18px;border:0;border-right:1px solid #e7eaf0;border-radius:0;background:rgba(255,255,255,.98);box-shadow:none;backdrop-filter:blur(18px)}
  .desktop-brand{display:flex;align-items:center;gap:12px;padding:0 8px 34px}
  .desktop-brand>span{width:40px;height:40px;display:grid;place-items:center;border-radius:13px;background:linear-gradient(145deg,#5146dc,#8074f4);color:#fff;font:800 20px Georgia;box-shadow:0 8px 18px rgba(81,70,220,.24)}
  .desktop-brand div,.desktop-user div{display:flex;flex-direction:column;gap:3px}.desktop-brand b{font-size:15px}.desktop-brand small,.desktop-user small{color:var(--muted);font-size:11px}
  .nav-label{display:block;padding:0 12px 9px;color:#a0a8b7;font-size:10px;font-weight:700;letter-spacing:.12em}
  .nav-btn{display:flex;align-items:center;gap:13px;width:100%;padding:12px 14px;margin:2px 0;border-radius:12px;text-align:left;color:#657084;transition:.18s ease}
  .nav-btn i{width:22px;font-style:normal;font-size:20px;text-align:center}.nav-btn:hover{background:#f5f4ff;color:#574ddb}.nav-btn.active{background:#efedff;color:#574ddb;font-weight:700;box-shadow:inset 3px 0 #675be6}
  .desktop-support{display:flex;flex-direction:column;gap:8px;margin-top:auto;padding:16px;border:1px solid #e8e5ff;border-radius:16px;background:linear-gradient(145deg,#f8f7ff,#efedff)}
  .desktop-support b{font-size:12px}.desktop-support small{color:#777f91;font-size:10px;line-height:1.5}.desktop-support button{border:0;border-radius:9px;padding:9px;background:#fff;color:#5f55da;font-size:11px;font-weight:700}
  .desktop-user{display:flex;align-items:center;gap:9px;margin-top:18px;padding:14px 8px 0;border-top:1px solid var(--line)}.desktop-user>span{width:32px;height:32px;display:grid;place-items:center;border-radius:10px;background:#17263c;color:#fff}.desktop-user b{font-size:12px}.desktop-user i{margin-left:auto;color:#a0a8b7;font-style:normal}
  .desktop-topbar{display:flex;position:fixed;z-index:15;left:256px;right:0;top:0;height:72px;align-items:center;justify-content:space-between;padding:0 48px;border-bottom:1px solid rgba(225,229,237,.9);background:rgba(255,255,255,.88);backdrop-filter:blur(16px)}
  .desktop-topbar>div:first-child{display:flex;align-items:baseline;gap:14px}.desktop-topbar strong{font-size:18px}.desktop-topbar span{color:var(--muted);font-size:11px}.top-actions{display:flex;align-items:center;gap:8px}.top-actions button{position:relative;width:34px;height:34px;border:1px solid var(--line);border-radius:10px;background:#fff;color:#536073}.top-actions button i{position:absolute;right:7px;top:7px;width:5px;height:5px;border-radius:50%;background:#ff6d62}.top-actions .date-chip{margin-left:6px;padding:8px 12px;border-radius:10px;background:#f2f0ff;color:#655bdd;font-weight:600}
  .hero{min-height:300px;padding:40px 44% 40px 42px;border-radius:24px;display:flex;flex-direction:column;align-items:flex-start;justify-content:center;position:relative;overflow:hidden;background:linear-gradient(120deg,#3329a8,#6558e8 58%,#9187f4)}
  .hero:before,.hero:after{content:'';position:absolute;border-radius:50%;border:1px solid rgba(255,255,255,.16)}.hero:before{width:430px;height:430px;right:-80px;top:-180px}.hero:after{width:260px;height:260px;right:70px;bottom:-180px;background:rgba(255,255,255,.05)}
  .hero h1{font-size:36px;max-width:560px}.hero p{font-size:15px}.hero .primary{padding:13px 22px;transition:.18s}.hero .primary:hover{transform:translateY(-2px);box-shadow:0 10px 20px rgba(15,20,80,.2)}
  .section-head{margin:30px 0 14px}.section-head h2{font-size:20px}.card{border:1px solid rgba(230,234,241,.8);box-shadow:0 8px 30px rgba(31,42,68,.055)}
  .list{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:18px}.list .course-card{display:block;padding:14px;transition:.2s}.list .course-card:hover{transform:translateY(-4px);box-shadow:0 16px 35px rgba(31,42,68,.11)}.list .cover{width:100%;height:156px;margin-bottom:12px}.list .course-main{padding:0 4px 5px}
  .course-card{max-width:none}.page>.course-card{width:min(720px,100%);padding:18px}.page>.course-card .cover{width:150px;flex-basis:150px;height:136px}.course-main h3{font-size:17px}
  .detail-hero{display:grid;grid-template-columns:260px 1fr;gap:30px;padding:26px}.detail-hero .cover{width:260px;height:190px}.detail-progress{margin-top:20px;padding:24px}.lesson-list{padding:8px 24px}.lesson-item{padding:18px 8px}
  .video-shell{max-width:1080px;margin:16px auto 22px}.video-box{max-height:610px}.player-info,.info-box,.comment-box{max-width:1080px;margin-left:auto;margin-right:auto}
  .menu-panel,.device-box,.ticket-box,.security-box,.security-overview,.summary-box,.tabset,.subpage>.wide-btn{max-width:960px;margin-left:auto;margin-right:auto}.menu-row{display:flex;align-items:center;justify-content:space-between;padding:20px 8px;cursor:pointer}.menu-row:hover{background:#fafaff}.menu-main h3{font-size:16px}.menu-main p{font-size:12px}
}

@media (min-width:1440px){.page{padding-left:324px;padding-right:68px}.list{grid-template-columns:repeat(3,minmax(280px,1fr))}}

@media (max-width:1023px){button,.menu-row,.lesson-item{touch-action:manipulation}.bottom-nav{grid-template-columns:repeat(3,minmax(0,1fr));padding:9px 8px calc(9px + env(safe-area-inset-bottom));bottom:max(8px,env(safe-area-inset-bottom))}.nav-btn{min-height:44px;min-width:0;padding:5px 2px;font-size:12px}.nav-btn i{display:none}.page{padding-bottom:calc(138px + env(safe-area-inset-bottom))}}