:root {
  --primary: #6d28d9;
  --primary-dark: #5b21b6;
  --primary-light: #ede9fe;
  --accent: #f59e0b;
  --ink: #1f2937;
  --ink-soft: #4b5563;
  --muted: #6b7280;
  --line: #e5e7eb;
  --bg: #ffffff;
  --bg-muted: #f8f7fc;
  --success: #16a34a;
  --danger: #dc2626;
  --warn: #d97706;
  --radius: 14px;
  --radius-sm: 9px;
  --shadow: 0 10px 30px rgba(31, 17, 79, 0.08);
  --shadow-sm: 0 4px 14px rgba(31, 17, 79, 0.06);
  --container: 1160px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  color: var(--ink);
  background: var(--bg);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--primary); text-decoration: none; }
a:hover { color: var(--primary-dark); }
img { max-width: 100%; display: block; }
h1, h2, h3, h4 { color: var(--ink); line-height: 1.3; margin: 0 0 .5em; }
p { margin: 0 0 1em; }

.container { width: 100%; max-width: var(--container); margin: 0 auto; padding: 0 20px; }
.muted { color: var(--muted); }
.mono { font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; font-size: .86em; }

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: .4em;
  padding: 10px 20px; border-radius: 999px; border: 1px solid transparent;
  font-size: 15px; font-weight: 600; cursor: pointer; transition: all .18s ease;
  background: none; color: var(--ink); white-space: nowrap;
}
.btn-primary { background: var(--primary); color: #fff; box-shadow: 0 6px 18px rgba(109, 40, 217, .28); }
.btn-primary:hover { background: var(--primary-dark); color: #fff; transform: translateY(-1px); }
.btn-ghost { border-color: var(--line); color: var(--ink); background: #fff; }
.btn-ghost:hover { border-color: var(--primary); color: var(--primary); }
.btn-outline { border-color: var(--primary); color: var(--primary); background: #fff; }
.btn-outline:hover { background: var(--primary); color: #fff; }
.btn-light { background: #fff; color: var(--primary); }
.btn-light:hover { background: #f3f0ff; color: var(--primary-dark); }
.btn-ghost-light { border-color: rgba(255,255,255,.6); color: #fff; }
.btn-ghost-light:hover { background: rgba(255,255,255,.15); color: #fff; }
.btn-lg { padding: 13px 28px; font-size: 16px; }
.btn-block { width: 100%; }
.link-more { color: var(--primary); font-weight: 600; font-size: 14px; }
.link-danger { background: none; border: 0; color: var(--danger); cursor: pointer; font-size: 14px; font-weight: 600; padding: 0; }

/* ---------- Header ---------- */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: rgba(255,255,255,.92); backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--line);
}
.header-inner { display: flex; align-items: center; gap: 28px; height: 68px; }
.logo { display: inline-flex; align-items: center; gap: 10px; font-weight: 800; font-size: 20px; color: var(--ink); }
.logo-mark {
  width: 38px; height: 38px; border-radius: 11px; display: grid; place-items: center;
  background: linear-gradient(135deg, var(--primary), #a855f7); color: #fff; font-size: 19px; font-weight: 800;
  box-shadow: 0 6px 16px rgba(109,40,217,.3);
}
.main-nav { display: flex; gap: 6px; margin-left: 10px; }
.main-nav a { padding: 8px 14px; border-radius: 10px; color: var(--ink-soft); font-weight: 500; font-size: 15px; }
.main-nav a:hover { background: var(--bg-muted); color: var(--primary); }
.main-nav a.active { color: var(--primary); background: var(--primary-light); }
.header-actions { margin-left: auto; display: flex; gap: 10px; }
.nav-toggle { display: none; margin-left: auto; font-size: 24px; background: none; border: 0; cursor: pointer; }
.mobile-nav { display: none; flex-direction: column; padding: 8px 20px 16px; border-top: 1px solid var(--line); }
.mobile-nav a { padding: 12px 0; border-bottom: 1px solid var(--bg-muted); }

/* ---------- Flash ---------- */
.flash { margin: 14px auto 0; padding: 12px 18px; border-radius: var(--radius-sm); font-weight: 500; }
.flash-success { background: #ecfdf5; color: #047857; border: 1px solid #a7f3d0; }
.flash-error { background: #fef2f2; color: #b91c1c; border: 1px solid #fecaca; }

/* ---------- Hero ---------- */
.hero { background: radial-gradient(1200px 500px at 80% -10%, #ede9fe 0%, transparent 60%), linear-gradient(180deg, #faf9ff 0%, #fff 100%); padding: 70px 0 80px; overflow: hidden; }
.hero-inner { display: grid; grid-template-columns: 1.05fr .95fr; gap: 50px; align-items: center; }
.hero-badge { display: inline-block; padding: 6px 16px; border-radius: 999px; background: var(--primary-light); color: var(--primary); font-weight: 600; font-size: 13px; margin-bottom: 20px; }
.hero h1 { font-size: 46px; font-weight: 800; letter-spacing: -.5px; margin-bottom: 18px; }
.hero-sub { font-size: 17px; color: var(--ink-soft); max-width: 560px; margin-bottom: 28px; }
.hero-actions { display: flex; gap: 14px; flex-wrap: wrap; margin-bottom: 40px; }
.hero-stats { display: flex; gap: 36px; flex-wrap: wrap; }
.hero-stats div { display: flex; flex-direction: column; }
.hero-stats strong { font-size: 26px; font-weight: 800; color: var(--primary); }
.hero-stats strong em { font-size: 14px; font-style: normal; }
.hero-stats span { color: var(--muted); font-size: 13px; }
.hero-visual { position: relative; height: 380px; }
.hero-glow { position: absolute; inset: 20% 10%; background: radial-gradient(circle, rgba(168,85,247,.35), transparent 70%); filter: blur(30px); }
.hero-card {
  position: absolute; display: flex; align-items: center; gap: 14px; padding: 16px 20px;
  background: #fff; border-radius: 16px; box-shadow: var(--shadow); border: 1px solid var(--line);
  animation: float 5s ease-in-out infinite;
}
.hero-card strong { display: block; font-size: 15px; }
.hero-card span { font-size: 12px; color: var(--muted); }
.hero-card-icon { width: 44px; height: 44px; border-radius: 12px; display: grid; place-items: center; font-size: 22px; background: var(--primary-light); }
.hero-card-1 { top: 30px; left: 0; animation-delay: 0s; }
.hero-card-2 { top: 150px; right: 0; animation-delay: 1.2s; }
.hero-card-3 { bottom: 20px; left: 40px; animation-delay: 2.4s; }
@keyframes float { 0%,100% { transform: translateY(0); } 50% { transform: translateY(-12px); } }

/* ---------- Sections ---------- */
.section { padding: 64px 0; }
.section-muted { background: var(--bg-muted); }
.section-head { display: flex; align-items: flex-end; justify-content: space-between; gap: 20px; margin-bottom: 30px; }
.section-head.center { flex-direction: column; align-items: center; text-align: center; }
.section-head h2 { font-size: 28px; font-weight: 800; margin-bottom: 4px; }
.section-head p { color: var(--muted); margin: 0; }

/* ---------- Features ---------- */
.feature-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
.feature-item { padding: 26px; border-radius: var(--radius); background: #fff; border: 1px solid var(--line); transition: all .2s; }
.feature-item:hover { box-shadow: var(--shadow); transform: translateY(-4px); border-color: var(--primary-light); }
.feature-icon { font-size: 30px; margin-bottom: 12px; }
.feature-item h3 { font-size: 17px; margin-bottom: 8px; }
.feature-item p { color: var(--muted); font-size: 14px; margin: 0; }

/* ---------- Course cards ---------- */
.course-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 26px; }
.course-grid-3 { grid-template-columns: repeat(3, 1fr); }
.course-card { display: flex; flex-direction: column; background: #fff; border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; transition: all .2s; color: inherit; }
.course-card:hover { box-shadow: var(--shadow); transform: translateY(-4px); border-color: var(--primary-light); color: inherit; }
.course-cover { position: relative; aspect-ratio: 16/9; overflow: hidden; }
.course-cover img { width: 100%; height: 100%; object-fit: cover; }
.course-cover-placeholder { width: 100%; height: 100%; display: grid; place-items: center; font-size: 54px; background: linear-gradient(135deg, #ede9fe, #fae8ff); }
.course-tag { position: absolute; top: 12px; left: 12px; padding: 4px 12px; border-radius: 999px; background: rgba(109,40,217,.9); color: #fff; font-size: 12px; font-weight: 600; }
.course-level { position: absolute; top: 12px; right: 12px; padding: 4px 12px; border-radius: 999px; background: rgba(255,255,255,.92); color: var(--ink); font-size: 12px; font-weight: 600; }
.course-body { padding: 18px; display: flex; flex-direction: column; flex: 1; }
.course-body h3 { font-size: 17px; margin-bottom: 8px; }
.course-summary { color: var(--muted); font-size: 13.5px; flex: 1; margin-bottom: 14px; }
.course-meta { display: flex; gap: 16px; font-size: 12.5px; color: var(--muted); margin-bottom: 14px; }
.course-foot { display: flex; align-items: center; justify-content: space-between; padding-top: 14px; border-top: 1px solid var(--line); }
.course-price strong { color: #db2777; font-size: 21px; font-weight: 800; }
.course-price del { color: var(--muted); font-size: 13px; margin-left: 8px; }
.course-students { font-size: 12.5px; color: var(--muted); }

/* ---------- Steps ---------- */
.step-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
.step-item { text-align: center; padding: 30px 20px; background: #fff; border-radius: var(--radius); border: 1px solid var(--line); }
.step-num { font-size: 30px; font-weight: 800; color: var(--primary-light); display: block; margin-bottom: 8px; }
.step-item h3 { font-size: 17px; margin-bottom: 8px; }
.step-item p { color: var(--muted); font-size: 14px; margin: 0; }

/* ---------- Testimonials ---------- */
.testimonial-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.testimonial { background: #fff; padding: 26px; border-radius: var(--radius); border: 1px solid var(--line); }
.testimonial p { color: var(--ink-soft); font-style: italic; }
.testimonial-author { display: flex; align-items: center; gap: 12px; margin-top: 18px; }
.testimonial-author .avatar { width: 44px; height: 44px; border-radius: 50%; display: grid; place-items: center; background: var(--primary-light); color: var(--primary); font-weight: 700; }
.testimonial-author strong { display: block; font-size: 14px; }
.testimonial-author span { font-size: 12.5px; color: var(--muted); }

/* ---------- CTA ---------- */
.cta { background: linear-gradient(120deg, var(--primary), #9333ea); color: #fff; }
.cta-inner { display: flex; align-items: center; justify-content: space-between; gap: 30px; padding: 56px 20px; flex-wrap: wrap; }
.cta h2 { color: #fff; font-size: 27px; margin-bottom: 8px; }
.cta p { color: rgba(255,255,255,.85); margin: 0; }
.cta-actions { display: flex; gap: 14px; flex-wrap: wrap; }

/* ---------- Page head ---------- */
.page-head { background: linear-gradient(180deg, #faf9ff, #fff); padding: 48px 0 32px; border-bottom: 1px solid var(--line); }
.page-head h1 { font-size: 32px; font-weight: 800; margin-bottom: 6px; }
.page-head p { color: var(--muted); margin: 0; }

/* ---------- Course filters ---------- */
.course-filters { display: flex; gap: 12px; margin-bottom: 24px; flex-wrap: wrap; }
.course-filters input[type=search] { flex: 1; min-width: 220px; padding: 11px 16px; border: 1px solid var(--line); border-radius: 999px; font-size: 15px; }
.course-filters select { padding: 11px 16px; border: 1px solid var(--line); border-radius: 999px; font-size: 15px; background: #fff; }
.course-filters input:focus, .course-filters select:focus { outline: none; border-color: var(--primary); box-shadow: 0 0 0 3px var(--primary-light); }
.result-count { color: var(--muted); margin-bottom: 18px; }

/* ---------- Pagination ---------- */
.pagination { display: flex; gap: 8px; justify-content: center; margin-top: 40px; flex-wrap: wrap; }
.pagination a, .pagination span { min-width: 40px; height: 40px; display: grid; place-items: center; border-radius: 10px; border: 1px solid var(--line); color: var(--ink-soft); font-weight: 600; font-size: 14px; padding: 0 12px; }
.pagination a:hover { border-color: var(--primary); color: var(--primary); }
.pagination .current { background: var(--primary); color: #fff; border-color: var(--primary); }

/* ---------- Empty ---------- */
.empty-state { text-align: center; padding: 60px 20px; color: var(--muted); }
.empty-state.small { padding: 30px; }
.empty-icon { font-size: 50px; margin-bottom: 14px; }
.empty-state h1 { font-size: 26px; }

/* ---------- Course detail ---------- */
.course-hero { background: linear-gradient(120deg, #4c1d95, #7c3aed); color: #fff; padding: 44px 0; }
.course-hero h1 { color: #fff; font-size: 34px; margin: 14px 0 10px; }
.course-hero-sub { color: rgba(255,255,255,.9); font-size: 17px; margin-bottom: 18px; }
.course-hero-meta { display: flex; gap: 22px; flex-wrap: wrap; font-size: 14px; color: rgba(255,255,255,.92); }
.breadcrumb { font-size: 13px; color: rgba(255,255,255,.7); }
.breadcrumb a { color: rgba(255,255,255,.85); }
.pill { display: inline-block; padding: 4px 14px; border-radius: 999px; background: rgba(255,255,255,.2); font-size: 13px; font-weight: 600; }
.course-detail-grid { display: grid; grid-template-columns: 1fr 340px; gap: 30px; align-items: start; }
.course-detail-main { display: flex; flex-direction: column; gap: 24px; }
.card { background: #fff; border: 1px solid var(--line); border-radius: var(--radius); padding: 26px; }
.card-title { font-size: 20px; margin-bottom: 18px; }
.card-head { display: flex; align-items: center; justify-content: space-between; gap: 16px; margin-bottom: 18px; flex-wrap: wrap; }
.card-head .card-title { margin: 0; }
.rich-text { color: var(--ink-soft); white-space: pre-wrap; }
.lesson-list { list-style: none; margin: 0; padding: 0; }
.lesson-item { display: flex; align-items: center; gap: 14px; padding: 14px 16px; border-radius: 10px; border: 1px solid var(--line); margin-bottom: 10px; }
.lesson-item.is-free { background: #fffbeb; border-color: #fde68a; }
.lesson-index { width: 30px; height: 30px; border-radius: 8px; display: grid; place-items: center; background: var(--primary-light); color: var(--primary); font-weight: 700; font-size: 13px; flex-shrink: 0; }
.lesson-title { flex: 1; font-weight: 500; }
.lesson-right { display: flex; align-items: center; gap: 12px; color: var(--muted); font-size: 13px; }
.badge-free { color: var(--warn); font-weight: 600; }
.lesson-duration { font-family: ui-monospace, monospace; }
.buy-card { background: #fff; border: 1px solid var(--line); border-radius: var(--radius); padding: 22px; box-shadow: var(--shadow-sm); position: sticky; top: 88px; }
.buy-cover { aspect-ratio: 16/9; border-radius: 10px; overflow: hidden; margin-bottom: 16px; }
.buy-cover img { width: 100%; height: 100%; object-fit: cover; }
.buy-price { display: flex; align-items: baseline; gap: 10px; margin-bottom: 16px; flex-wrap: wrap; }
.buy-price strong { font-size: 32px; color: #db2777; font-weight: 800; }
.buy-price del { color: var(--muted); font-size: 15px; }
.discount { background: #fef2f2; color: #db2777; font-size: 12px; font-weight: 600; padding: 3px 10px; border-radius: 999px; }
.buy-note { text-align: center; font-size: 13px; color: var(--muted); margin: 12px 0 0; }
.buy-features { list-style: none; margin: 18px 0 0; padding: 18px 0 0; border-top: 1px solid var(--line); }
.buy-features li { font-size: 13.5px; color: var(--ink-soft); padding: 5px 0; }

/* ---------- Checkout ---------- */
.checkout-wrap { display: grid; grid-template-columns: 1fr 340px; gap: 30px; align-items: start; }
.checkout-main { display: flex; flex-direction: column; gap: 24px; }
.order-course { display: flex; gap: 16px; align-items: center; padding-bottom: 20px; border-bottom: 1px solid var(--line); }
.order-course-icon { width: 64px; height: 64px; border-radius: 12px; display: grid; place-items: center; font-size: 30px; background: var(--primary-light); }
.order-course-info h3 { font-size: 17px; margin-bottom: 4px; }
.order-course-info p { margin: 0; font-size: 13px; color: var(--muted); }
.order-lines { padding-top: 18px; }
.order-line { display: flex; justify-content: space-between; padding: 8px 0; color: var(--ink-soft); }
.order-line-total { border-top: 1px solid var(--line); margin-top: 10px; padding-top: 16px; font-size: 16px; }
.order-line-total strong { color: #db2777; font-size: 24px; font-weight: 800; }
.pay-method { display: flex; align-items: center; gap: 14px; padding: 16px 18px; border: 2px solid var(--line); border-radius: 12px; cursor: pointer; margin-bottom: 16px; }
.pay-method.active { border-color: var(--primary); background: var(--primary-light); }
.pay-method input { display: none; }
.pay-method-icon { width: 42px; height: 42px; border-radius: 10px; display: grid; place-items: center; color: #fff; font-weight: 700; }
.pay-method-icon.wechat { background: #07c160; }
.pay-method-body { flex: 1; }
.pay-method-body strong { display: block; }
.pay-method-body small { color: var(--muted); }
.pay-method-check { color: var(--primary); font-weight: 800; opacity: 0; }
.pay-method.active .pay-method-check { opacity: 1; }
.pay-tip { font-size: 13px; color: var(--muted); margin-bottom: 16px; }
.pay-steps { padding-left: 20px; color: var(--ink-soft); font-size: 14px; }
.pay-steps li { margin-bottom: 8px; }

/* ---------- Mock pay ---------- */
.mock-pay-wrap { max-width: 420px; margin: 0 auto; text-align: center; }
.mock-phone { background: #fff; border: 1px solid var(--line); border-radius: 20px; overflow: hidden; box-shadow: var(--shadow); text-align: left; }
.mock-phone-bar { background: #07c160; color: #fff; padding: 14px 20px; display: flex; justify-content: space-between; font-weight: 600; }
.mock-mode { font-size: 12px; background: rgba(255,255,255,.25); padding: 2px 10px; border-radius: 999px; }
.mock-phone-body { padding: 26px 22px; }
.mock-amount { font-size: 34px; font-weight: 800; text-align: center; margin-bottom: 6px; }
.mock-merchant { text-align: center; color: var(--muted); margin-bottom: 22px; }
.mock-row { display: flex; justify-content: space-between; padding: 12px 0; border-top: 1px solid var(--line); font-size: 14px; color: var(--ink-soft); }
.mock-phone-body .btn { margin-top: 10px; }
.mock-note { margin-top: 22px; font-size: 13px; color: var(--muted); line-height: 1.8; }

/* ---------- Auth ---------- */
.auth-wrap { padding: 60px 20px; display: grid; place-items: center; background: radial-gradient(800px 400px at 50% 0%, #ede9fe, transparent 70%); min-height: 70vh; }
.auth-card { width: 100%; max-width: 440px; background: #fff; border: 1px solid var(--line); border-radius: 18px; padding: 36px; box-shadow: var(--shadow); }
.auth-card h1 { font-size: 25px; text-align: center; margin-bottom: 6px; }
.auth-sub { text-align: center; color: var(--muted); margin-bottom: 26px; }
.auth-foot { text-align: center; color: var(--muted); margin: 20px 0 0; font-size: 14px; }
.auth-foot a { color: var(--primary); font-weight: 600; }
.auth-demo { margin-top: 20px; padding: 12px 16px; background: var(--bg-muted); border-radius: 10px; font-size: 13px; color: var(--muted); }
.auth-demo p { margin: 0; }
.auth-demo code { background: #fff; padding: 1px 6px; border-radius: 4px; color: var(--primary); }

/* ---------- Forms ---------- */
.form-group { margin-bottom: 18px; }
.form-group label { display: block; font-weight: 600; font-size: 14px; margin-bottom: 7px; }
.form-group input, .form-group select, .form-group textarea {
  width: 100%; padding: 12px 15px; border: 1px solid var(--line); border-radius: 10px; font-size: 15px; font-family: inherit; background: #fff; color: var(--ink);
}
.form-group input:focus, .form-group select:focus, .form-group textarea:focus { outline: none; border-color: var(--primary); box-shadow: 0 0 0 3px var(--primary-light); }
.form-group input:disabled { background: var(--bg-muted); color: var(--muted); }
.form-row { display: flex; gap: 16px; }
.form-row .form-group { flex: 1; }
.checkbox { display: inline-flex; align-items: center; gap: 8px; font-size: 14px; cursor: pointer; margin-right: 20px; }
.checkbox input { width: auto; }
.checkbox.agree { margin: 4px 0 18px; font-size: 13.5px; color: var(--ink-soft); display: flex; align-items: flex-start; }
.checkbox.agree input { margin-top: 4px; }
.form-actions { display: flex; gap: 12px; align-items: center; margin-top: 8px; }

/* ---------- User center ---------- */
.user-hero { background: linear-gradient(120deg, #4c1d95, #7c3aed); color: #fff; padding: 40px 0; }
.user-hero-inner { display: flex; align-items: center; justify-content: space-between; gap: 18px; flex-wrap: wrap; }
.user-hero-profile { display: flex; align-items: center; gap: 18px; min-width: 0; }
.user-avatar { width: 64px; height: 64px; border-radius: 50%; display: grid; place-items: center; background: rgba(255,255,255,.2); font-size: 26px; font-weight: 700; }
.user-hero-info h1 { color: #fff; font-size: 24px; margin-bottom: 4px; }
.user-hero-info p { color: rgba(255,255,255,.8); margin: 0; font-size: 14px; }
.user-tabs { display: flex; gap: 6px; border-bottom: 1px solid var(--line); margin-top: 8px; overflow-x: auto; }
.user-tabs a { padding: 14px 18px; color: var(--ink-soft); font-weight: 600; border-bottom: 2px solid transparent; white-space: nowrap; }
.user-tabs a.active { color: var(--primary); border-bottom-color: var(--primary); }
.stat-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; margin-bottom: 36px; }
.stat-card { display: flex; align-items: center; gap: 16px; background: #fff; border: 1px solid var(--line); border-radius: var(--radius); padding: 20px 22px; }
.stat-icon { font-size: 26px; }
.stat-card strong { display: block; font-size: 24px; font-weight: 800; }
.stat-card span { color: var(--muted); font-size: 13px; }
.user-section { margin-bottom: 40px; }
.progress { height: 8px; background: var(--line); border-radius: 999px; overflow: hidden; margin: 8px 0; }
.progress-bar { height: 100%; background: linear-gradient(90deg, var(--primary), #a855f7); border-radius: 999px; transition: width .4s; }
.mini-course-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.mini-course { background: #fff; border: 1px solid var(--line); border-radius: var(--radius); padding: 20px; }
.mini-course h3 { font-size: 16px; margin-bottom: 8px; }
.profile-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; align-items: start; }
.my-course-list { display: flex; flex-direction: column; gap: 18px; }
.my-course-card { display: grid; grid-template-columns: 180px 1fr auto; gap: 20px; background: #fff; border: 1px solid var(--line); border-radius: var(--radius); padding: 18px; align-items: center; }
.my-course-cover { height: 110px; border-radius: 10px; background: var(--primary-light) center/cover; }
.my-course-body h3 { font-size: 17px; margin-bottom: 6px; }
.my-course-body p { margin: 4px 0; font-size: 13.5px; }
.my-course-actions { display: flex; flex-direction: column; gap: 8px; }

/* ---------- Tables ---------- */
.table-wrap { overflow-x: auto; }
.data-table { width: 100%; border-collapse: collapse; font-size: 14px; }
.data-table th, .data-table td { padding: 12px 14px; text-align: left; border-bottom: 1px solid var(--line); vertical-align: middle; }
.data-table th { background: var(--bg-muted); font-weight: 600; color: var(--ink-soft); white-space: nowrap; }
.data-table tbody tr:hover { background: #faf9ff; }
.data-table .actions { display: flex; gap: 12px; align-items: center; }
.data-table .actions form { margin: 0; }
.status-badge { display: inline-block; padding: 3px 11px; border-radius: 999px; font-size: 12.5px; font-weight: 600; }
.status-ok { background: #ecfdf5; color: #047857; }
.status-warn { background: #fffbeb; color: #b45309; }
.status-muted { background: #f3f4f6; color: #6b7280; }

/* ---------- Learn ---------- */
.learn-body { background: #0f0b1f; }
.learn-header { background: #1a1333; border-bottom: 1px solid rgba(255,255,255,.08); position: sticky; top: 0; z-index: 40; }
.learn-header .logo-text { color: #fff; }
.learn-header-inner { display: flex; align-items: center; justify-content: space-between; height: 64px; }
.learn-header-actions { display: flex; gap: 10px; }
.learn-header .btn-ghost { background: transparent; border-color: rgba(255,255,255,.2); color: #fff; }
.learn-main { padding: 24px 0 60px; }
.learn-wrap { max-width: var(--container); margin: 0 auto; padding: 0 20px; display: grid; grid-template-columns: 1fr 340px; gap: 24px; align-items: start; }
.learn-player { min-width: 0; }
.player-box { background: #000; border-radius: 14px; overflow: hidden; aspect-ratio: 16/9; display: grid; place-items: center; }
.player-box video, .player-box iframe { width: 100%; height: 100%; border: 0; }
.player-placeholder { text-align: center; color: rgba(255,255,255,.7); padding: 30px; }
.player-placeholder .player-play { width: 74px; height: 74px; border-radius: 50%; background: var(--primary); color: #fff; display: grid; place-items: center; font-size: 30px; margin: 0 auto 18px; }
.player-placeholder p { color: #fff; font-size: 18px; margin-bottom: 6px; }
.player-placeholder small { color: rgba(255,255,255,.5); }
.learn-titlebar { display: flex; align-items: center; justify-content: space-between; gap: 16px; padding: 20px 4px; flex-wrap: wrap; }
.learn-titlebar h1 { color: #fff; font-size: 21px; margin-bottom: 4px; }
.learn-titlebar .muted { color: rgba(255,255,255,.55); margin: 0; font-size: 13.5px; }
.learn-navbar { display: flex; justify-content: space-between; padding: 0 4px 20px; }
.learn-sidebar { background: #1a1333; border-radius: 14px; overflow: hidden; position: sticky; top: 88px; }
.learn-course-info { padding: 20px; border-bottom: 1px solid rgba(255,255,255,.08); }
.learn-course-info h2 { color: #fff; font-size: 17px; }
.learn-course-info .muted { color: rgba(255,255,255,.6); }
.learn-course-info .progress { background: rgba(255,255,255,.12); }
.learn-lesson-list { list-style: none; margin: 0; padding: 8px; max-height: 60vh; overflow-y: auto; }
.learn-lesson-list a { display: flex; align-items: center; gap: 12px; padding: 12px 14px; border-radius: 10px; color: rgba(255,255,255,.8); font-size: 14px; }
.learn-lesson-list a:hover { background: rgba(255,255,255,.07); color: #fff; }
.learn-lesson-list li.current a { background: var(--primary); color: #fff; }
.ll-index { font-size: 12px; opacity: .7; width: 20px; }
.ll-title { flex: 1; }
.ll-duration { font-size: 12px; opacity: .6; }
.learn-body .flash { margin-left: auto; margin-right: auto; }

/* ---------- Contact ---------- */
.contact-grid { display: grid; grid-template-columns: 1fr 1.2fr; gap: 30px; align-items: start; }
.contact-list { list-style: none; margin: 0; padding: 0; }
.contact-list li { display: flex; gap: 14px; padding: 14px 0; border-bottom: 1px solid var(--line); }
.contact-icon { font-size: 22px; }
.contact-list strong { display: block; font-size: 14px; }
.contact-list p { margin: 0; color: var(--muted); font-size: 14px; }

/* ---------- Prose ---------- */
.prose { max-width: 860px; }
.prose h2 { font-size: 20px; margin: 32px 0 12px; }
.prose p, .prose li { color: var(--ink-soft); }
.prose ul, .prose ol { padding-left: 22px; }

/* ---------- Footer ---------- */
.site-footer { background: #17122b; color: rgba(255,255,255,.7); padding: 56px 0 28px; margin-top: 40px; }
.footer-grid { display: grid; grid-template-columns: 1.4fr 1fr 1fr 1.4fr; gap: 32px; }
.footer-brand .logo { color: #fff; margin-bottom: 14px; }
.footer-slogan { color: #fff; font-weight: 600; margin-bottom: 8px; }
.footer-desc { font-size: 13.5px; line-height: 1.7; }
.footer-col h4 { color: #fff; font-size: 15px; margin-bottom: 14px; }
.footer-col a, .footer-col p { display: block; color: rgba(255,255,255,.66); font-size: 13.5px; margin-bottom: 8px; }
.footer-col a:hover { color: #fff; }
.footer-bottom { border-top: 1px solid rgba(255,255,255,.1); margin-top: 36px; padding-top: 22px; font-size: 13px; }
.footer-bottom a { color: rgba(255,255,255,.8); }
.footer-meta { color: rgba(255,255,255,.45); margin-top: 8px; }

/* ---------- Responsive ---------- */
@media (max-width: 980px) {
  .hero-inner { grid-template-columns: 1fr; }
  .hero-visual { display: none; }
  .feature-grid, .step-grid, .course-grid, .course-grid-3, .testimonial-grid { grid-template-columns: repeat(2, 1fr); }
  .course-detail-grid, .checkout-wrap, .profile-grid, .contact-grid, .learn-wrap { grid-template-columns: 1fr; }
  .stat-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: repeat(2, 1fr); }
  .buy-card, .learn-sidebar { position: static; }
  .my-course-card { grid-template-columns: 1fr; }
  .my-course-cover { height: 160px; }
}
@media (max-width: 720px) {
  .main-nav, .header-actions { display: none; }
  .nav-toggle { display: block; }
  .site-header.nav-open .mobile-nav { display: flex; }
  .hero h1 { font-size: 32px; }
  .section { padding: 44px 0; }
  .feature-grid, .step-grid, .course-grid, .course-grid-3, .testimonial-grid, .mini-course-grid { grid-template-columns: 1fr; }
  .section-head { flex-direction: column; align-items: flex-start; }
  .cta-inner { flex-direction: column; align-items: flex-start; }
  .form-row { flex-direction: column; gap: 0; }
  .footer-grid { grid-template-columns: 1fr; }
  .stat-grid { grid-template-columns: 1fr 1fr; }
  .auth-card { padding: 26px; }
}

/* ---------- Logo image ---------- */
.logo-img { width: 30px; height: 30px; object-fit: contain; border-radius: 8px; background: #fff; }
.footer-brand .logo-img { width: 30px; height: 30px; }

/* ---------- News / Articles ---------- */
.news-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 22px; }
.news-card { display: flex; flex-direction: column; background: #fff; border: 1px solid var(--line); border-radius: var(--radius); padding: 22px; transition: all .2s; color: inherit; }
.news-card:hover { box-shadow: var(--shadow); transform: translateY(-4px); border-color: var(--primary-light); color: inherit; }
.news-card-meta { display: flex; align-items: center; gap: 10px; margin-bottom: 12px; }
.news-card-meta time { font-size: 12.5px; color: var(--muted); }
.news-card h3 { font-size: 16px; margin-bottom: 8px; }
.news-card p { color: var(--muted); font-size: 13.5px; flex: 1; margin-bottom: 14px; }
.news-card .link-more { font-size: 13.5px; }

.article-tabs { margin-bottom: 26px; }
.article-list { display: flex; flex-direction: column; gap: 16px; }
.article-item { display: block; background: #fff; border: 1px solid var(--line); border-radius: var(--radius); padding: 22px 24px; transition: all .2s; color: inherit; }
.article-item:hover { box-shadow: var(--shadow-sm); border-color: var(--primary-light); color: inherit; }
.article-item h3 { font-size: 18px; margin: 10px 0 8px; }
.article-item p { color: var(--muted); margin: 0; }
.article-item-meta { display: flex; align-items: center; gap: 14px; font-size: 12.5px; color: var(--muted); }
.article-views { color: var(--muted); }
.article-top { background: #fef2f2; color: #db2777; padding: 2px 9px; border-radius: 999px; font-weight: 600; }

.article-cat { display: inline-block; padding: 3px 11px; border-radius: 999px; font-size: 12px; font-weight: 600; background: var(--primary-light); color: var(--primary); }
.cat-notice { background: #fef2f2; color: #dc2626; }
.cat-news { background: #eff6ff; color: #2563eb; }
.cat-tutorial { background: #ecfdf5; color: #059669; }
.cat-activity { background: #fffbeb; color: #d97706; }

.article-head .breadcrumb.dark { color: rgba(255,255,255,.7); }
.article-head .breadcrumb.dark a { color: rgba(255,255,255,.85); }
.article-meta { display: flex; align-items: center; gap: 16px; flex-wrap: wrap; color: rgba(255,255,255,.85); font-size: 13.5px; margin-top: 14px; }
.article-detail-grid { display: grid; grid-template-columns: 1fr 320px; gap: 30px; align-items: start; }
.article-content .rich-text { line-height: 1.9; }
.article-share { display: flex; align-items: center; gap: 14px; margin-top: 30px; padding-top: 22px; border-top: 1px solid var(--line); flex-wrap: wrap; }
.article-share span { color: var(--muted); }
.article-aside { display: flex; flex-direction: column; gap: 20px; }
.aside-list { list-style: none; margin: 0; padding: 0; }
.aside-list li { padding: 10px 0; border-bottom: 1px dashed var(--line); }
.aside-list li:last-child { border-bottom: 0; }
.aside-list a { display: block; color: var(--ink); font-size: 14.5px; }
.aside-list a:hover { color: var(--primary); }
.aside-list time { font-size: 12px; color: var(--muted); }
.cta-side { background: linear-gradient(135deg, var(--primary), #9333ea); color: #fff; text-align: center; }
.cta-side h2 { color: #fff; font-size: 19px; }
.cta-side p { color: rgba(255,255,255,.85); }

/* ---------- Teachers ---------- */
.teacher-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
.teacher-card { background: #fff; border: 1px solid var(--line); border-radius: var(--radius); padding: 26px; text-align: center; transition: all .2s; }
.teacher-card:hover { box-shadow: var(--shadow); transform: translateY(-4px); border-color: var(--primary-light); }
.teacher-avatar { width: 76px; height: 76px; border-radius: 50%; display: grid; place-items: center; margin: 0 auto 14px; font-size: 34px; background: linear-gradient(135deg, #ede9fe, #fae8ff); }
.teacher-card h3 { font-size: 18px; margin-bottom: 4px; }
.teacher-title { display: inline-block; color: var(--primary); font-size: 13px; font-weight: 600; margin-bottom: 12px; }
.teacher-card p { color: var(--muted); font-size: 13.5px; margin: 0; text-align: left; }
.teacher-join { display: flex; align-items: center; justify-content: space-between; gap: 20px; margin-top: 34px; flex-wrap: wrap; }
.teacher-join h2 { font-size: 20px; margin-bottom: 6px; }
.teacher-join p { margin: 0; color: var(--ink-soft); }

/* ---------- FAQ ---------- */
.faq-home { max-width: 820px; margin: 0 auto; }
.faq { border: 1px solid var(--line); border-radius: 12px; padding: 4px 18px; margin-bottom: 12px; background: #fff; }
.faq > summary { cursor: pointer; font-weight: 600; padding: 14px 0; list-style: none; position: relative; padding-right: 26px; }
.faq > summary::-webkit-details-marker { display: none; }
.faq > summary::after { content: '+'; position: absolute; right: 0; top: 12px; font-size: 20px; color: var(--primary); }
.faq[open] > summary::after { content: '−'; }
.faq > p { color: var(--ink-soft); font-size: 14.5px; margin: 0 0 14px; line-height: 1.8; }
.faq-more { text-align: center; margin-top: 20px; }

/* ---------- Help center ---------- */
.help-grid { display: grid; grid-template-columns: 1fr 330px; gap: 30px; align-items: start; }
.help-main { display: flex; flex-direction: column; gap: 22px; }
.help-aside { display: flex; flex-direction: column; gap: 20px; }

@media (max-width: 980px) {
  .news-grid, .teacher-grid { grid-template-columns: repeat(2, 1fr); }
  .article-detail-grid, .help-grid { grid-template-columns: 1fr; }
}
@media (max-width: 720px) {
  .news-grid, .teacher-grid { grid-template-columns: 1fr; }
  .article-meta { gap: 10px; font-size: 12.5px; }
}

/* 文章详情头图（深色） */
.article-head { background: linear-gradient(120deg, #4c1d95, #7c3aed); border-bottom: 0; }
.article-head h1 { color: #fff; }
.article-head .breadcrumb.dark { color: rgba(255,255,255,.7); }

/* ---------- 顶部公告条 ---------- */
.topbar { background: #4c1d95; color: #fff; font-size: 13.5px; }
.topbar-inner { display: flex; align-items: center; gap: 10px; height: 40px; overflow: hidden; }
.topbar-tag { flex-shrink: 0; background: rgba(255,255,255,.2); padding: 2px 10px; border-radius: 6px; font-size: 12px; font-weight: 600; }
.topbar-text { flex: 1; color: rgba(255,255,255,.92); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.topbar-text:hover { color: #fff; }
.topbar-more { flex-shrink: 0; color: rgba(255,255,255,.75); }
.topbar-more:hover { color: #fff; }
@media (max-width: 720px) { .topbar-more { display: none; } }

/* 讲师头像图片 */
.teacher-avatar-img { width: 76px; height: 76px; border-radius: 50%; object-fit: cover; margin: 0 auto 14px; display: block; }