:root{--bg:#070a11;--panel:#0c1320;--panel2:#0f1828;--line:#22304a;--text:#edf4ff;--muted:#91a1ba;--blue:#4d8dff;--cyan:#18c8ff;--violet:#8a72ff;--green:#4ad7a5;--radius:16px;font-family:Inter,"Noto Sans TC","PingFang TC","Microsoft JhengHei",Arial,sans-serif;color-scheme:dark}
*{box-sizing:border-box}html{background:var(--bg);scroll-behavior:smooth}body{margin:0;min-width:320px;min-height:100vh;background:radial-gradient(circle at 83% -12%,rgba(77,141,255,.18),transparent 34rem),var(--bg);color:var(--text);font-size:16px}button,input,textarea,select{font:inherit}button,a{-webkit-tap-highlight-color:transparent}button{cursor:pointer}.app-shell{min-height:100vh}.sidebar{position:fixed;inset:0 auto 0 0;z-index:20;width:268px;display:flex;flex-direction:column;padding:24px 20px;border-right:1px solid rgba(34,48,74,.9);background:rgba(8,13,22,.96);backdrop-filter:blur(18px)}.brand{display:flex;align-items:center;gap:12px;color:inherit;text-decoration:none;border-radius:10px}.brand-mark{display:grid;width:42px;height:42px;place-items:center;border:1px solid rgba(135,190,255,.28);border-radius:11px;background:linear-gradient(135deg,#4d8dff,#18c8ff);box-shadow:0 0 26px rgba(77,141,255,.25);font-weight:900;color:#fff}.brand b{display:block;font-size:15px;letter-spacing:.02em}.brand small{display:block;margin-top:3px;color:#5d6b82;font-size:10px;letter-spacing:.17em}.side-nav{display:grid;gap:8px;margin-top:48px}.nav-item{display:flex;min-height:50px;align-items:center;gap:13px;padding:0 14px;border:1px solid transparent;border-radius:12px;background:transparent;color:#77869c;text-align:left;font-weight:650;transition:.2s}.nav-item:hover{border-color:#1f2b43;background:#0f1725;color:#d9e5f8}.nav-item.active{border-color:rgba(77,141,255,.32);background:rgba(77,141,255,.12);box-shadow:inset 3px 0 0 var(--blue);color:#fff}.nav-symbol{width:21px;text-align:center;color:#647590}.nav-item.active .nav-symbol{color:#71a5ff}.profile{display:flex;align-items:center;gap:11px;margin-top:auto;padding:20px 6px 0;border-top:1px solid #1d293f}.avatar{display:grid;width:38px;height:38px;flex:none;place-items:center;border:1px solid rgba(77,141,255,.25);border-radius:10px;background:rgba(77,141,255,.12);color:#b9d4ff;font-size:14px;font-weight:800}.profile-copy{min-width:0;flex:1}.profile-copy b,.profile-copy small{display:block;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.profile-copy b{font-size:13px}.profile-copy small{margin-top:3px;color:#596981;font-size:11px}.online-dot{width:8px;height:8px;border-radius:50%;background:#4ad7a5;box-shadow:0 0 0 4px rgba(74,215,165,.1)}.mobile-header,.mobile-nav{display:none}.main-content{min-height:100vh;margin-left:268px}.view[hidden]{display:none!important}.view.active{display:block}.page-wrap{width:min(100%,1320px);margin:0 auto;padding:38px 48px 64px}.page-wrap.wide{width:min(100%,1480px)}.page-heading{display:flex;align-items:flex-end;justify-content:space-between;gap:24px}.eyebrow{margin:0;color:#78a9ff;font-size:13px;font-weight:800;letter-spacing:.1em}.page-heading h1,.course-heading h1{margin:8px 0 0;font-size:clamp(30px,3vw,42px);line-height:1.13;letter-spacing:-.035em}.sync-note{display:flex;align-items:center;gap:8px;margin:0;padding:10px 14px;border:1px solid #1f2b42;border-radius:12px;background:rgba(13,20,33,.7);color:#8b9bb2;font-size:12px;font-weight:650}.sync-note span{color:var(--cyan)}.stats{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;margin-top:30px}.stat-card{display:flex;min-height:94px;align-items:center;gap:15px;padding:17px 20px;border:1px solid #1c293f;border-radius:16px;background:rgba(11,18,30,.85)}.stat-icon{display:grid;width:42px;height:42px;flex:none;place-items:center;border:1px solid #263650;border-radius:12px;background:#0b111d;font-size:18px;font-style:normal;font-weight:800}.stat-icon.blue{color:#7ba9ff}.stat-icon.cyan{color:#63e2ff}.stat-icon.violet{color:#a998ff}.stat-card small,.stat-card b{display:block}.stat-card small{color:#617089;font-size:12px}.stat-card b{margin-top:6px;font-size:16px}.section-block{margin-top:42px}.section-title,.library-title{display:flex;align-items:flex-end;justify-content:space-between;gap:20px;margin-bottom:17px}.section-title h2,.library-title h2{margin:0;font-size:21px}.section-title>span{color:#536178;font-size:11px;font-weight:800;letter-spacing:.16em}.library-title p{margin:7px 0 0;color:#617089;font-size:14px}.library-title>b{color:#697a94;font-size:14px}.featured-course{display:grid;grid-template-columns:1.12fr .88fr;overflow:hidden;border:1px solid rgba(77,141,255,.28);border-radius:18px;background:#0d1625;box-shadow:0 24px 70px rgba(0,0,0,.27)}.course-visual,.small-course-visual{position:relative;min-height:350px;overflow:hidden;padding:30px;border:0;border-right:1px solid #1f2b42;background-color:#0a111d;background-image:linear-gradient(rgba(255,255,255,.03) 1px,transparent 1px),linear-gradient(90deg,rgba(255,255,255,.03) 1px,transparent 1px),radial-gradient(circle at 82% 15%,rgba(77,141,255,.3),transparent 38%);background-size:28px 28px,28px 28px,auto;color:#fff;text-align:left}.course-visual:after,.small-course-visual:after{content:"";position:absolute;right:-70px;bottom:-90px;width:260px;height:260px;border-radius:50%;background:rgba(24,200,255,.12);filter:blur(45px)}.chip{position:absolute;top:28px;left:28px;padding:6px 10px;border:1px solid rgba(125,180,255,.23);border-radius:6px;background:rgba(77,141,255,.1);color:#b9d3ff;font-size:11px;font-weight:800;letter-spacing:.06em}.demo-label{position:absolute;top:32px;right:28px;color:#586780;font-size:10px;font-weight:800;letter-spacing:.15em}.play-button,.mini-play,.large-play{display:grid;place-items:center;border:1px solid rgba(150,200,255,.28);background:var(--blue);box-shadow:0 10px 28px rgba(18,75,180,.4);color:#fff}.play-button{position:absolute;bottom:62px;left:30px;width:58px;height:58px;border-radius:17px;font-size:20px}.course-number{position:absolute;bottom:30px;left:30px;color:#5b6a82;font-size:10px;font-weight:850;letter-spacing:.16em}.featured-copy{display:flex;flex-direction:column;justify-content:center;padding:34px}.featured-copy h3,.course-card-copy h3{margin:0;color:#fff;line-height:1.25}.featured-copy h3{font-size:30px;letter-spacing:-.025em}.featured-copy>p{margin:15px 0 0;color:#91a0b6;font-size:15px;line-height:1.75}.course-meta{display:flex;flex-wrap:wrap;gap:20px;margin-top:22px;color:#67758b;font-size:12px;font-weight:650}.progress-row{display:flex;align-items:center;justify-content:space-between;margin-top:25px;color:#b8c4d6;font-size:12px;font-weight:700}.progress-row b{color:#7ba9ff}.progress-track{height:8px;margin-top:9px;overflow:hidden;border-radius:999px;background:#1a263a}.progress-fill{display:block;width:0;height:100%;border-radius:inherit;background:linear-gradient(90deg,var(--blue),var(--cyan));transition:width .35s ease}.primary-row{display:flex;min-height:46px;align-items:center;justify-content:space-between;margin-top:24px;padding:0 16px;border:1px solid #2a3954;border-radius:12px;background:rgba(8,14,24,.55);color:#edf4ff;font-size:14px;font-weight:800}.primary-row:hover{border-color:rgba(77,141,255,.55);background:rgba(77,141,255,.1);color:#bcd4ff}.course-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:20px}.course-card{overflow:hidden;border:1px solid #1b283d;border-radius:17px;background:#0b121e}.small-course-visual{display:block;width:100%;min-height:210px;border-right:0;border-bottom:1px solid #1f2b42}.small-course-visual .chip{top:20px;left:20px}.mini-play{position:absolute;bottom:50px;left:20px;width:44px;height:44px;border-radius:13px;font-size:14px}.small-course-visual .course-number{bottom:20px;left:20px}.course-card-copy{padding:20px}.course-card-copy h3{font-size:18px}.course-card-copy>p{min-height:48px;margin:9px 0 0;color:#7f8ea5;font-size:13px;line-height:1.7}.primary-row.compact{min-height:43px;margin-top:20px}.back-link{padding:0;border:0;background:transparent;color:#6e7d94;font-size:14px;font-weight:700}.back-link:hover{color:#8cb6ff}.course-heading{display:flex;align-items:flex-end;justify-content:space-between;gap:30px;margin-top:23px}.course-progress-box{width:min(100%,380px);padding:13px 15px;border:1px solid #1d2a40;border-radius:13px;background:rgba(10,17,29,.7)}.course-progress-box>div:first-child{display:flex;justify-content:space-between;color:#7d8ca3;font-size:12px;font-weight:700}.course-progress-box b{color:#77a7ff}.learning-layout{display:grid;grid-template-columns:minmax(0,1fr) 360px;gap:26px;margin-top:28px}.video-stage{position:relative;aspect-ratio:16/9;overflow:hidden;border:1px solid #2a3851;border-radius:17px;background:#03050a;box-shadow:0 25px 60px rgba(0,0,0,.36)}.video-stage iframe{width:100%;height:100%;border:0}.video-placeholder{display:flex;width:100%;height:100%;flex-direction:column;align-items:center;justify-content:center;padding:30px;background-image:linear-gradient(rgba(255,255,255,.025) 1px,transparent 1px),linear-gradient(90deg,rgba(255,255,255,.025) 1px,transparent 1px);background-size:28px 28px;text-align:center}.large-play{width:66px;height:66px;border-radius:18px;font-size:22px}.video-placeholder h2{margin:20px 0 0;font-size:17px}.video-placeholder p{margin:9px 0 0;color:#5e6d85;font-size:13px}.lesson-panel{display:flex;align-items:center;justify-content:space-between;gap:20px;margin-top:18px;padding:20px;border:1px solid #1c293f;border-radius:16px;background:#0b121e}.lesson-panel h2{margin:8px 0 0;font-size:22px}.lesson-panel>div:first-child>p:not(.eyebrow){margin:8px 0 0;color:#7e8da4;font-size:13px;line-height:1.65}.lesson-panel small{display:block;margin-top:12px;color:#53627a}.lesson-actions{display:flex;flex:none;gap:9px}.secondary-button,.blue-button,.cyan-button{min-height:44px;padding:0 17px;border-radius:12px;font-size:13px;font-weight:800}.secondary-button{border:1px solid #2b3a54;background:#0a111d;color:#cbd5e4}.secondary-button.done{border-color:rgba(74,215,165,.3);background:rgba(74,215,165,.1);color:#7ee4be}.blue-button{border:1px solid #6aa0ff;background:var(--blue);color:#fff}.cyan-button{border:1px solid #78eaff;background:var(--cyan);color:#04131d}.full{width:100%}.outline{align-self:start;overflow:hidden;border:1px solid #1c293f;border-radius:17px;background:#0a111d}.outline>header{display:flex;align-items:center;justify-content:space-between;padding:20px;border-bottom:1px solid #1c293f}.outline header small{color:#53627a;font-size:10px;font-weight:850;letter-spacing:.14em}.outline header h2{margin:5px 0 0;font-size:18px}.outline header>span{padding:6px 9px;border:1px solid #293852;border-radius:8px;color:#8392a9;font-size:11px}.outline>div{padding:10px}.lesson-item{display:flex;width:100%;min-height:78px;align-items:flex-start;gap:11px;padding:12px;border:1px solid transparent;border-radius:12px;background:transparent;color:#b7c2d2;text-align:left}.lesson-item:hover{border-color:#1d2a40;background:#0e1725}.lesson-item.active{border-color:rgba(77,141,255,.32);background:rgba(77,141,255,.1);color:#fff}.lesson-index{display:grid;width:29px;height:29px;flex:none;place-items:center;border:1px solid #293852;border-radius:9px;background:#0a111d;color:#677791;font-size:11px;font-weight:800}.lesson-item.active .lesson-index{border-color:#6ea3ff;background:var(--blue);color:#fff}.lesson-item>span:nth-child(2){min-width:0;flex:1}.lesson-item b,.lesson-item small{display:block}.lesson-item b{font-size:13px;line-height:1.5}.lesson-item small{margin-top:6px;color:#596981;font-size:10px}.lesson-item i{color:#42516a;font-style:normal}.lesson-item.complete .lesson-index{border-color:rgba(74,215,165,.3);background:rgba(74,215,165,.1);color:#6be0b5}.lesson-item.complete i{color:#6be0b5}.admin-heading{align-items:flex-start}.subcopy{margin:12px 0 0;color:#6a7890;font-size:14px}.notice{display:flex;align-items:center;gap:16px;margin-top:28px;padding:14px 17px;border:1px solid rgba(77,141,255,.25);border-radius:13px;background:rgba(77,141,255,.08)}.notice b{flex:none;color:#9ec0ff;font-size:13px}.notice span{color:#8291a8;font-size:13px}.admin-grid{display:grid;grid-template-columns:1fr 1fr;gap:22px;margin-top:22px}.form-card{padding:25px;border:1px solid #1c293f;border-radius:17px;background:#0b121e}.form-title{display:flex;align-items:flex-start;gap:14px}.form-title h2{margin:0;font-size:20px}.form-title p{margin:6px 0 0;color:#64738a;font-size:13px}.form-card form{display:grid;gap:17px;margin-top:25px}.form-card label>span{display:block;margin-bottom:8px;color:#b8c3d3;font-size:13px;font-weight:750}.form-card input,.form-card textarea,.form-card select{width:100%;min-height:44px;padding:10px 12px;border:1px solid #2a3953;border-radius:10px;background:#070c14;color:#fff;outline:0}.form-card input:focus,.form-card textarea:focus,.form-card select:focus{border-color:#659cff;box-shadow:0 0 0 3px rgba(77,141,255,.14)}.form-card textarea{resize:vertical}.form-status{min-height:20px;margin:0;color:#6fdcb4;font-size:12px}.saved-courses{margin-top:23px;padding:24px;border:1px solid #1c293f;border-radius:17px;background:#0b121e}.saved-courses h2{margin:0;font-size:18px}.saved-courses article{display:flex;align-items:center;justify-content:space-between;gap:20px;padding:17px 0;border-bottom:1px solid #1b273b}.saved-courses article:last-child{padding-bottom:0;border-bottom:0}.saved-courses b,.saved-courses small{display:block}.saved-courses small{margin-top:5px;color:#5f6e85;font-size:11px}.saved-courses i{padding:6px 9px;border-radius:7px;background:rgba(74,215,165,.1);color:#65d8ae;font-size:11px;font-style:normal;font-weight:750}.noscript{position:fixed;inset:auto 0 0;margin:0;padding:12px;background:#fff2bf;color:#241d00;text-align:center}
@media(max-width:1180px){.course-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.featured-course{grid-template-columns:1fr}.course-visual{min-height:290px;border-right:0;border-bottom:1px solid #1f2b42}.learning-layout{grid-template-columns:1fr}.outline{position:static}.admin-grid{grid-template-columns:1fr}}
@media(max-width:900px){.sidebar{display:none}.mobile-header{position:sticky;top:0;z-index:30;display:flex;height:72px;align-items:center;justify-content:space-between;padding:0 18px;border-bottom:1px solid #1c293f;background:rgba(8,12,20,.94);backdrop-filter:blur(16px)}.mobile-header .brand-mark{width:38px;height:38px}.main-content{margin-left:0}.page-wrap{padding:28px 20px 105px}.page-heading,.course-heading{align-items:flex-start;flex-direction:column}.sync-note{align-self:flex-start}.stats{grid-template-columns:1fr}.course-progress-box{width:100%}.mobile-nav{position:fixed;inset:auto 12px 12px;z-index:50;display:grid;grid-template-columns:repeat(3,1fr);gap:4px;padding:6px;border:1px solid #32415d;border-radius:17px;background:rgba(11,18,30,.96);box-shadow:0 18px 50px rgba(0,0,0,.48);backdrop-filter:blur(18px)}.mobile-nav button{display:flex;min-height:57px;flex-direction:column;align-items:center;justify-content:center;gap:4px;border:0;border-radius:12px;background:transparent;color:#63728a;font-size:10px;font-weight:750}.mobile-nav button b{font-size:16px}.mobile-nav button.active{background:rgba(77,141,255,.14);color:#83adff}.lesson-panel{align-items:flex-start;flex-direction:column}.lesson-actions{width:100%}.lesson-actions button{flex:1}}
@media(max-width:620px){.page-heading h1,.course-heading h1{font-size:30px}.course-grid{grid-template-columns:1fr}.featured-copy{padding:24px}.featured-copy h3{font-size:24px}.course-visual{min-height:260px}.library-title{align-items:flex-start}.admin-grid{gap:16px}.form-card{padding:20px}.notice{align-items:flex-start;flex-direction:column;gap:7px}.lesson-actions{flex-direction:column}.lesson-actions button{width:100%}.saved-courses article{align-items:flex-start;flex-direction:column}}
