:root{
  --bg:#f6f8fb; --card:#fff; --ink:#101828; --muted:#667085; --line:#e4e7ec;
  --blue:#2563eb; --teal:#0f766e; --soft-blue:#eaf1ff; --soft-teal:#e7f7f4;
  --orange:#f97316; --red:#dc2626; --green:#16a34a; --purple:#7c3aed;
  --shadow:0 18px 50px rgba(16,24,40,.08); --radius:22px;
}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--bg);color:var(--ink);font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","Noto Sans TC",Arial,sans-serif}a{color:inherit;text-decoration:none}img{max-width:100%;display:block}.container-xl{width:min(1160px,calc(100% - 32px));margin:auto}.topbar{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.88);backdrop-filter:blur(14px);border-bottom:1px solid var(--line)}.nav-inner{height:74px;display:flex;align-items:center;justify-content:space-between;gap:20px}.logo{display:flex;align-items:center;gap:12px;font-weight:900;letter-spacing:.02em}.logo small{display:block;color:var(--muted);font-size:12px;font-weight:700}.logo-mark{width:42px;height:42px;border-radius:14px;background:linear-gradient(135deg,var(--blue),var(--teal));box-shadow:0 10px 24px rgba(37,99,235,.2);position:relative}.logo-mark:after{content:"";position:absolute;inset:10px;border:2px solid #fff;border-radius:9px}.nav{display:flex;align-items:center;gap:8px}.nav a{padding:10px 14px;border-radius:999px;color:#475467;font-weight:750}.nav a.active,.nav a:hover{background:#eef4ff;color:var(--blue)}.nav-actions{display:flex;gap:10px;align-items:center}.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;border:0;border-radius:999px;padding:11px 18px;font-weight:850;cursor:pointer;transition:.2s;white-space:nowrap}.btn:hover{transform:translateY(-1px)}.btn-blue{background:var(--blue);color:#fff;box-shadow:0 12px 24px rgba(37,99,235,.22)}.btn-teal{background:var(--teal);color:#fff}.btn-outline{background:#fff;border:1px solid var(--line);color:#344054}.btn-ghost{background:transparent;color:#475467}.btn-danger{background:#fee2e2;color:#991b1b}.btn-sm{padding:8px 12px;font-size:13px}.icon-btn{width:42px;height:42px;border-radius:999px;border:1px solid var(--line);background:#fff;font-size:18px;cursor:pointer}.hero{position:relative;overflow:hidden;padding:90px 0 72px;background:radial-gradient(circle at 15% 25%,#dbeafe 0,transparent 34%),radial-gradient(circle at 85% 20%,#ccfbf1 0,transparent 32%),linear-gradient(180deg,#fff,#f6f8fb)}.hero:after{content:"";position:absolute;right:-160px;bottom:-200px;width:480px;height:480px;border-radius:50%;background:rgba(37,99,235,.08)}.hero-grid{display:grid;grid-template-columns:1.08fr .92fr;gap:42px;align-items:center;position:relative;z-index:1}.hero h1{font-size:clamp(40px,6vw,76px);line-height:1.03;margin:0 0 20px;letter-spacing:-.05em}.hero h1 span{color:var(--blue)}.hero p{font-size:18px;line-height:1.9;color:#475467;margin:0 0 8px}.hero-actions{display:flex;gap:12px;flex-wrap:wrap;margin-top:28px}.hero-features{display:grid;grid-template-columns:repeat(3,1fr);gap:14px;margin-top:34px}.feature-mini,.stat-card{background:rgba(255,255,255,.8);border:1px solid #fff;border-radius:20px;padding:18px;box-shadow:var(--shadow);color:#475467}.feature-mini b{display:block;color:var(--ink);margin-bottom:5px}.hero-photo{border-radius:34px;overflow:hidden;box-shadow:var(--shadow);border:8px solid #fff;min-height:400px}.hero-photo img{height:100%;min-height:400px;width:100%;object-fit:cover}.section-title{display:flex;align-items:end;justify-content:space-between;gap:20px;margin:58px 0 22px}.section-title h2{font-size:32px;margin:0 0 5px;letter-spacing:-.03em}.section-title p{margin:0;color:var(--muted);line-height:1.7}.section-title a{color:var(--blue);font-weight:850}.course-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}.course-card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;box-shadow:0 10px 30px rgba(16,24,40,.05);transition:.2s}.course-card:hover{transform:translateY(-4px);box-shadow:var(--shadow)}.course-card img{height:190px;width:100%;object-fit:cover}.course-body{padding:20px}.course-body h3{font-size:21px;margin:10px 0 8px}.course-body p{color:var(--muted);line-height:1.65;margin:8px 0}.badge{display:inline-flex;align-items:center;border-radius:999px;padding:6px 10px;font-size:12px;font-weight:900;background:#eef4ff;color:var(--blue)}.badge.green{background:#dcfce7;color:#166534}.badge.yellow{background:#fef3c7;color:#92400e}.badge.red{background:#fee2e2;color:#991b1b}.badge.purple{background:#f3e8ff;color:#6b21a8}.price{font-weight:950;color:var(--blue);font-size:20px}.why{display:grid;grid-template-columns:repeat(5,1fr);gap:14px;margin:42px 0;background:#fff;border:1px solid var(--line);border-radius:28px;padding:18px}.why-item{padding:18px;border-radius:18px;background:#f9fafb;text-align:center;color:#344054}.teacher-row,.teacher-card-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}.teacher-card,.teacher-public-card{background:#fff;border:1px solid var(--line);border-radius:24px;padding:18px;box-shadow:0 10px 30px rgba(16,24,40,.04)}.teacher-card{display:flex;gap:14px;align-items:center}.avatar{width:76px;height:76px;border-radius:20px;object-fit:cover}.teacher-public-photo img{height:250px;width:100%;object-fit:cover;border-radius:18px}.teacher-public-body{padding-top:16px}.teacher-public-top{display:flex;justify-content:space-between;gap:14px;align-items:start}.teacher-public-top h3{font-size:23px;margin:0}.teacher-public-top p,.teacher-public-bio{color:var(--muted);line-height:1.7}.teacher-public-meta{display:grid;grid-template-columns:repeat(3,1fr);gap:10px;margin:18px 0}.teacher-public-meta div{background:#f9fafb;border-radius:16px;padding:12px;text-align:center}.teacher-public-meta strong{display:block;color:var(--ink)}.teacher-public-meta span{font-size:12px;color:var(--muted)}.page-hero{padding:54px 0;background:linear-gradient(135deg,#fff,#eef4ff);border-bottom:1px solid var(--line)}.page-hero h1{font-size:42px;margin:0 0 10px;letter-spacing:-.04em}.page-hero p{max-width:720px;color:var(--muted);line-height:1.8}.filter-card{background:#fff;border:1px solid var(--line);border-radius:24px;padding:18px;margin:26px 0;display:flex;gap:12px;align-items:center;box-shadow:0 8px 24px rgba(16,24,40,.04)}.input,.select,textarea{width:100%;border:1px solid var(--line);background:#fff;border-radius:14px;padding:13px 14px;font-size:15px;font-family:inherit}textarea{min-height:130px;resize:vertical}.form-grid{display:grid;grid-template-columns:1fr 1fr;gap:16px}.detail-grid{display:grid;grid-template-columns:1fr 380px;gap:24px;margin-top:38px}.panel{background:#fff;border:1px solid var(--line);border-radius:28px;padding:24px;box-shadow:0 10px 30px rgba(16,24,40,.04)}.detail-cover{height:420px;border-radius:28px;object-fit:cover;width:100%;box-shadow:var(--shadow)}.meta-list{display:grid;gap:12px;margin:18px 0}.meta-list div{display:flex;justify-content:space-between;border-bottom:1px dashed var(--line);padding-bottom:10px;color:#475467}.curriculum{display:grid;gap:10px;margin-top:18px}.lesson-row{display:flex;justify-content:space-between;align-items:center;gap:12px;background:#f9fafb;border:1px solid var(--line);border-radius:16px;padding:14px}.lesson-row.active{background:#eef4ff;border-color:#bfdbfe}.empty-state-card{text-align:center;background:#fff;border:1px dashed #cbd5e1;border-radius:28px;padding:56px 22px;color:var(--muted)}.empty-icon{font-size:42px;margin-bottom:10px}.footer{margin-top:70px;background:#0b1220;color:#d0d5dd;padding:46px 0}.footer-grid{display:grid;grid-template-columns:1.4fr repeat(3,1fr);gap:30px}.footer a{display:block;color:#d0d5dd;margin:10px 0}.footer .logo-mark{box-shadow:none}.auth-wrap{min-height:calc(100vh - 74px);display:grid;grid-template-columns:1fr 1fr;background:#fff}.auth-side{background:linear-gradient(135deg,#172554,#0f766e);color:#fff;padding:70px;display:flex;flex-direction:column;justify-content:center}.auth-side h1{font-size:46px;line-height:1.08}.auth-card{display:flex;align-items:center;justify-content:center;padding:40px}.auth-card form{width:min(430px,100%);background:#fff;border:1px solid var(--line);border-radius:28px;padding:30px;box-shadow:var(--shadow)}.auth-card h2{font-size:30px;margin-top:0}.notice{padding:14px 16px;border-radius:16px;margin:14px 0;background:#ecfeff;color:#155e75;border:1px solid #a5f3fc}.video-layout{display:grid;grid-template-columns:1fr 360px;gap:24px;margin-top:30px}.video-frame{aspect-ratio:16/9;background:#000;border-radius:24px;overflow:hidden;box-shadow:var(--shadow)}.video-frame iframe{width:100%;height:100%;border:0}.admin-shell{display:grid;grid-template-columns:260px 1fr;min-height:100vh}.admin-sidebar{position:sticky;top:0;align-self:start;height:100vh;background:#0b1220;color:#e5e7eb;padding:22px;overflow:auto}.admin-sidebar .logo{margin-bottom:24px}.admin-nav{display:grid;gap:8px}.admin-nav a{padding:12px 14px;border-radius:14px;color:#d0d5dd;font-weight:800}.admin-nav a.active,.admin-nav a:hover{background:rgba(255,255,255,.1);color:#fff}.admin-main{padding:28px}.admin-top{display:flex;justify-content:space-between;gap:16px;align-items:center;margin-bottom:22px}.admin-top h1{font-size:32px;margin:0}.stat-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}.admin-stat{background:#fff;border:1px solid var(--line);border-radius:22px;padding:20px;box-shadow:0 8px 24px rgba(16,24,40,.04)}.admin-stat strong{display:block;font-size:30px;margin-top:10px}.table-card{background:#fff;border:1px solid var(--line);border-radius:24px;overflow:hidden;box-shadow:0 8px 24px rgba(16,24,40,.04);margin-top:20px}.table{width:100%;border-collapse:collapse}.table th,.table td{padding:15px 16px;text-align:left;border-bottom:1px solid var(--line);vertical-align:middle}.table th{font-size:13px;color:#475467;background:#f9fafb}.table tr:last-child td{border-bottom:0}.thumb{width:74px;height:52px;object-fit:cover;border-radius:12px}.avatar-mini{width:44px;height:44px;border-radius:14px;object-fit:cover}.progress{height:10px;background:#e5e7eb;border-radius:999px;overflow:hidden}.progress span{display:block;height:100%;background:linear-gradient(90deg,var(--blue),var(--teal));border-radius:999px}.actions{display:flex;gap:8px;flex-wrap:wrap}.chart-bars{display:grid;gap:12px}.chart-row{display:grid;grid-template-columns:180px 1fr 90px;gap:12px;align-items:center}.pay-card{max-width:980px;margin:34px auto;background:#fff;border:1px solid var(--line);border-radius:30px;box-shadow:var(--shadow);overflow:hidden;display:grid;grid-template-columns:1fr 1fr}.pay-info{padding:32px}.success-wrap{text-align:center;max-width:720px;margin:70px auto;background:#fff;border:1px solid var(--line);border-radius:32px;padding:50px;box-shadow:var(--shadow)}.mobile-menu{display:none}@media(max-width:940px){.hero-grid,.detail-grid,.video-layout,.pay-card,.auth-wrap{grid-template-columns:1fr}.course-grid,.teacher-row,.teacher-card-grid,.stat-grid{grid-template-columns:1fr 1fr}.why{grid-template-columns:1fr 1fr}.footer-grid{grid-template-columns:1fr 1fr}.admin-shell{grid-template-columns:1fr}.admin-sidebar{height:auto;position:relative}.admin-nav{grid-template-columns:repeat(2,1fr)}.nav{display:none}.hero-photo{min-height:280px}.hero-photo img{min-height:280px}}@media(max-width:620px){.container-xl{width:min(100% - 22px,1160px)}.nav-actions .btn-outline{display:none}.course-grid,.teacher-row,.teacher-card-grid,.stat-grid,.footer-grid,.form-grid{grid-template-columns:1fr}.hero-features,.why{grid-template-columns:1fr}.filter-card{flex-direction:column}.detail-cover{height:260px}.admin-main{padding:16px}.table{font-size:13px}.table th,.table td{padding:12px 10px}.auth-side{padding:36px}.auth-side h1{font-size:34px}.chart-row{grid-template-columns:1fr}.page-hero h1{font-size:34px}}