/* ─── Reset & Base ─────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --c-bg:        #f5f5f7;
  --c-bg-dark:   #0a0a0a;
  --c-surface:   #ffffff;
  --c-surface-dark: #1c1c1e;
  --c-text:      #1d1d1f;
  --c-text-sub:  #6e6e73;
  --c-text-dark: #f5f5f7;
  --c-text-dark-sub: rgba(245,245,247,.6);
  --c-accent:    #2563eb;
  --c-accent-lt: #eff6ff;
  --c-border:    rgba(0,0,0,.08);
  --c-border-dark: rgba(255,255,255,.1);
  --radius-sm:   10px;
  --radius:      18px;
  --radius-lg:   28px;
  --shadow-sm:   0 2px 12px rgba(0,0,0,.06);
  --shadow:      0 8px 32px rgba(0,0,0,.1);
  --shadow-lg:   0 20px 60px rgba(0,0,0,.15);
  --nav-h:       60px;
  --transition:  .4s cubic-bezier(.16,1,.3,1);
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: var(--nav-h);
  -webkit-font-smoothing: antialiased;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'PingFang SC', 'Helvetica Neue', sans-serif;
  background: var(--c-bg);
  color: var(--c-text);
  line-height: 1.6;
  overflow-x: hidden;
}

a { text-decoration: none; color: inherit; }
img { max-width: 100%; display: block; }
ul { list-style: none; }

.container {
  max-width: 1120px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ─── Reveal Animation ──────────────────────────────────── */
.reveal {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity .7s ease, transform .7s ease;
}
.reveal.visible {
  opacity: 1;
  transform: none;
}
.reveal:nth-child(2) { transition-delay: .1s; }
.reveal:nth-child(3) { transition-delay: .2s; }
.reveal:nth-child(4) { transition-delay: .3s; }
.reveal:nth-child(5) { transition-delay: .4s; }

/* ─── Navigation ────────────────────────────────────────── */
.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  height: var(--nav-h);
  transition: background var(--transition), backdrop-filter var(--transition), box-shadow var(--transition);
}
.nav.scrolled {
  background: rgba(245,245,247,.82);
  backdrop-filter: saturate(180%) blur(20px);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  box-shadow: 0 1px 0 var(--c-border);
}
/* 顶部深色 Hero 上，导航文字改白色 */
.nav:not(.scrolled) .nav-logo,
.nav:not(.scrolled) .nav-logo-text,
.nav:not(.scrolled) .nav-links a {
  color: rgba(255,255,255,.9);
}
.nav:not(.scrolled) .nav-links a:hover {
  color: #fff;
  background: rgba(255,255,255,.1);
}
.nav:not(.scrolled) .nav-hamburger span {
  background: rgba(255,255,255,.85);
}
.nav-inner {
  display: flex;
  align-items: center;
  height: var(--nav-h);
  max-width: 1120px;
  margin: 0 auto;
  padding: 0 24px;
  gap: 32px;
}
.nav-logo {
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: 700;
  font-size: 16px;
  white-space: nowrap;
  color: var(--c-text);
}
.nav-logo-img {
  width: 28px; height: 28px;
  border-radius: 6px;
  object-fit: contain;
  flex-shrink: 0;
}
.nav-links {
  display: flex;
  gap: 4px;
  flex: 1;
  justify-content: center;
}
.nav-links a {
  font-size: 14px;
  font-weight: 500;
  color: var(--c-text-sub);
  padding: 6px 12px;
  border-radius: 8px;
  transition: color .2s, background .2s;
}
.nav-links a:hover { color: var(--c-text); background: rgba(0,0,0,.05); }
.nav-cta {
  background: var(--c-accent);
  color: #fff !important;
  font-size: 14px;
  font-weight: 600;
  padding: 8px 18px;
  border-radius: 20px;
  white-space: nowrap;
  transition: opacity .2s, transform .2s;
}
.nav-cta:hover { opacity: .88; transform: scale(.97); }
.nav-hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
  margin-left: auto;
}
.nav-hamburger span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--c-text);
  border-radius: 2px;
  transition: var(--transition);
}
.nav-mobile {
  display: none;
  flex-direction: column;
  background: rgba(245,245,247,.96);
  backdrop-filter: blur(20px);
  padding: 12px 24px 20px;
  border-top: 1px solid var(--c-border);
}
.nav-mobile.open { display: flex; }
.nav-mobile-link {
  padding: 12px 0;
  font-size: 16px;
  font-weight: 500;
  border-bottom: 1px solid var(--c-border);
  color: var(--c-text);
}

/* ─── Hero ──────────────────────────────────────────────── */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--c-bg-dark);
  overflow: hidden;
  padding: calc(var(--nav-h) + 40px) 24px 80px;
}
.hero-bg {
  position: absolute;
  inset: 0;
  pointer-events: none;
}
.hero-orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(80px);
  opacity: .35;
  animation: orbFloat 12s ease-in-out infinite alternate;
}
.hero-orb-1 {
  width: 600px; height: 600px;
  background: radial-gradient(circle, #2563eb, transparent);
  top: -200px; left: -100px;
  animation-delay: 0s;
}
.hero-orb-2 {
  width: 500px; height: 500px;
  background: radial-gradient(circle, #7c3aed, transparent);
  top: 20%; right: -150px;
  animation-delay: -4s;
}
.hero-orb-3 {
  width: 400px; height: 400px;
  background: radial-gradient(circle, #0891b2, transparent);
  bottom: -100px; left: 40%;
  animation-delay: -8s;
}
@keyframes orbFloat {
  from { transform: translate(0, 0) scale(1); }
  to   { transform: translate(30px, -30px) scale(1.08); }
}
.hero-content {
  position: relative;
  text-align: center;
  max-width: 760px;
}
.hero-badge {
  display: inline-block;
  background: rgba(255,255,255,.1);
  border: 1px solid rgba(255,255,255,.2);
  color: rgba(255,255,255,.8);
  font-size: 13px;
  font-weight: 500;
  padding: 6px 16px;
  border-radius: 20px;
  margin-bottom: 28px;
  letter-spacing: .02em;
}
.hero-title {
  font-size: clamp(52px, 8vw, 96px);
  font-weight: 800;
  line-height: 1.05;
  letter-spacing: -.03em;
  color: #fff;
  margin-bottom: 24px;
}
.hero-title-em {
  background: linear-gradient(135deg, #60a5fa, #a78bfa, #34d399);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.hero-sub {
  font-size: clamp(16px, 2vw, 20px);
  color: rgba(255,255,255,.6);
  line-height: 1.7;
  margin-bottom: 40px;
}
.hero-actions {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
}
.btn-primary {
  display: inline-flex;
  align-items: center;
  background: var(--c-accent);
  color: #fff;
  font-size: 16px;
  font-weight: 600;
  padding: 14px 32px;
  border-radius: 50px;
  transition: opacity .2s, transform .2s;
}
.btn-primary:hover { opacity: .88; transform: scale(.97); }
.btn-ghost {
  display: inline-flex;
  align-items: center;
  background: rgba(255,255,255,.1);
  border: 1px solid rgba(255,255,255,.2);
  color: rgba(255,255,255,.85);
  font-size: 16px;
  font-weight: 600;
  padding: 14px 32px;
  border-radius: 50px;
  transition: background .2s;
}
.btn-ghost:hover { background: rgba(255,255,255,.18); }
.hero-scroll {
  position: absolute;
  bottom: 32px;
  left: 50%;
  transform: translateX(-50%);
  width: 28px;
  height: 44px;
  border: 2px solid rgba(255,255,255,.25);
  border-radius: 14px;
  display: flex;
  justify-content: center;
  padding-top: 6px;
}
.hero-scroll span {
  display: block;
  width: 4px;
  height: 8px;
  background: rgba(255,255,255,.5);
  border-radius: 2px;
  animation: scrollBounce 1.8s ease-in-out infinite;
}
@keyframes scrollBounce {
  0%,100% { transform: translateY(0); opacity: .5; }
  50%      { transform: translateY(8px); opacity: 1; }
}

/* ─── Stats ─────────────────────────────────────────────── */
.stats {
  background: var(--c-surface);
  padding: 64px 0;
}
.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0;
}
.stat-item {
  text-align: center;
  padding: 24px 16px;
  position: relative;
}
.stat-item + .stat-item::before {
  content: '';
  position: absolute;
  left: 0; top: 20%; bottom: 20%;
  width: 1px;
  background: var(--c-border);
}
.stat-num {
  display: block;
  font-size: clamp(36px, 5vw, 56px);
  font-weight: 800;
  letter-spacing: -.03em;
  color: var(--c-accent);
  line-height: 1;
}
.stat-unit {
  font-size: 20px;
  font-weight: 700;
  color: var(--c-accent);
  margin-left: 2px;
}
.stat-label {
  display: block;
  font-size: 14px;
  color: var(--c-text-sub);
  margin-top: 8px;
  font-weight: 500;
}

/* ─── Sections common ──────────────────────────────────── */
.section { padding: 100px 0; }
.dark-section { background: var(--c-bg-dark); color: var(--c-text-dark); }
.section-header {
  text-align: center;
  margin-bottom: 56px;
}
.section-tag {
  display: inline-block;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--c-accent);
  background: var(--c-accent-lt);
  padding: 4px 12px;
  border-radius: 20px;
  margin-bottom: 16px;
}
.dark-section .section-tag {
  background: rgba(37,99,235,.25);
  color: #93c5fd;
}
.section-title {
  font-size: clamp(32px, 5vw, 52px);
  font-weight: 800;
  letter-spacing: -.03em;
  line-height: 1.1;
  margin-bottom: 16px;
}
.section-desc {
  font-size: 17px;
  color: var(--c-text-sub);
  max-width: 560px;
  margin: 0 auto;
  line-height: 1.7;
}
.dark-section .section-desc { color: var(--c-text-dark-sub); }
.section-footer {
  text-align: center;
  margin-top: 48px;
}
.section-footer-tip {
  font-size: 14px;
  color: var(--c-text-sub);
  margin-bottom: 12px;
}
.miniprogram-hint {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  padding: 10px 20px;
  border-radius: 50px;
  font-size: 14px;
  font-weight: 500;
  color: var(--c-text);
}
.miniprogram-hint.dark {
  background: rgba(255,255,255,.08);
  border-color: rgba(255,255,255,.12);
  color: rgba(255,255,255,.8);
}
.mp-icon { font-size: 18px; }

/* ─── Filter Bar ────────────────────────────────────────── */
.filter-bar {
  display: flex;
  gap: 10px;
  justify-content: center;
  margin-bottom: 40px;
  flex-wrap: wrap;
}
.filter-btn {
  font-size: 14px;
  font-weight: 600;
  padding: 8px 20px;
  border-radius: 50px;
  border: 1.5px solid var(--c-border);
  background: var(--c-surface);
  color: var(--c-text-sub);
  cursor: pointer;
  transition: all .2s;
}
.filter-btn:hover {
  border-color: var(--c-accent);
  color: var(--c-accent);
}
.filter-btn.active {
  background: var(--c-accent);
  border-color: var(--c-accent);
  color: #fff;
}
/* 深色背景下的 filter 按钮 */
.filter-btn-dark {
  border-color: rgba(255,255,255,.15);
  background: rgba(255,255,255,.06);
  color: rgba(255,255,255,.55);
}
.filter-btn-dark:hover {
  border-color: var(--c-accent);
  color: var(--c-accent);
  background: rgba(37,99,235,.15);
}
.filter-btn-dark.active {
  background: var(--c-accent);
  border-color: var(--c-accent);
  color: #fff;
}

/* ─── Activities Grid ───────────────────────────────────── */
.activities-section { background: var(--c-bg-dark); }
.activities-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}
.activity-card {
  background: rgba(255,255,255,.06);
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid rgba(255,255,255,.1);
  transition: transform .3s, box-shadow .3s, background .3s;
}
.activity-card:hover {
  transform: translateY(-4px);
  background: rgba(255,255,255,.1);
  box-shadow: 0 12px 40px rgba(0,0,0,.4);
}
.activity-cover {
  width: 100%;
  aspect-ratio: 16/9;
  object-fit: cover;
  background: linear-gradient(135deg, #e0e7ff, #f0f9ff);
}
.activity-cover-placeholder {
  width: 100%;
  aspect-ratio: 16/9;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 40px;
  color: rgba(255,255,255,.6);
}
.activity-body { padding: 18px 20px 20px; }
.activity-badges {
  display: flex;
  gap: 8px;
  margin-bottom: 10px;
  flex-wrap: wrap;
}
.activity-badge {
  font-size: 11px;
  font-weight: 700;
  padding: 3px 10px;
  border-radius: 20px;
  letter-spacing: .02em;
}
.badge-adult  { background: #fef3c7; color: #92400e; }
.badge-child  { background: #dcfce7; color: #166534; }
.badge-status { background: var(--c-accent-lt); color: var(--c-accent); }
.activity-title {
  font-size: 16px;
  font-weight: 700;
  color: #fff;
  margin-bottom: 8px;
  line-height: 1.4;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.activity-meta {
  display: flex;
  gap: 16px;
  font-size: 13px;
  color: rgba(255,255,255,.5);
  margin-bottom: 12px;
  flex-wrap: wrap;
}
.activity-meta span { display: flex; align-items: center; gap: 4px; }
.activity-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 12px;
  border-top: 1px solid rgba(255,255,255,.1);
}
.activity-price {
  font-size: 18px;
  font-weight: 800;
  color: var(--c-accent);
}
.activity-price.free { color: #16a34a; }
.activity-enrolled {
  font-size: 12px;
  color: rgba(255,255,255,.45);
  background: rgba(255,255,255,.08);
  padding: 4px 10px;
  border-radius: 20px;
}

/* ─── Courses Grid ──────────────────────────────────────── */
.courses-section { background: var(--c-bg-dark); }
.courses-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
}
/* 课程卡片：上图下文 */
.course-card {
  border-radius: var(--radius);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  gap: 0;
  transition: transform .3s, box-shadow .3s;
  cursor: pointer;
  background: rgba(255,255,255,.05);
  border: 1px solid rgba(255,255,255,.08);
}
.course-card:hover { transform: translateY(-4px); box-shadow: 0 12px 32px rgba(0,0,0,.3); }
.course-cover-wrap {
  width: 100%;
  height: 180px;
  position: relative;
  overflow: hidden;
  border-radius: 0;
  flex-shrink: 0;
}
.course-cover-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}
.course-cover-fallback {
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 48px;
}
.course-body {
  flex: 1;
  padding: 18px 20px;
  border: none;
  border-radius: 0;
}
.course-tags-row {
  display: flex;
  align-items: center;
  gap: 6px;
  margin-bottom: 8px;
}
.course-section-tag {
  display: inline-block;
  font-size: 11px;
  font-weight: 600;
  padding: 2px 7px;
  border-radius: 6px;
  background: rgba(251,191,36,.15);
  color: #fbbf24;
}

/* 板块筛选 Tab（复用 filter-btn filter-btn-dark，与活动筛选样式一致） */
.section-filter-tabs {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  margin-bottom: 28px;
}

/* 往期精彩：活动角标 */
.past-type-badge {
  position: absolute;
  top: 10px;
  left: 10px;
  background: rgba(79,70,229,.85);
  color: #fff;
  font-size: 11px;
  font-weight: 700;
  padding: 3px 8px;
  border-radius: 6px;
  z-index: 2;
}
.course-tag {
  display: inline-block;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: .06em;
  text-transform: uppercase;
  padding: 3px 8px;
  border-radius: 6px;
  margin-bottom: 10px;
  background: rgba(37,99,235,.3);
  color: #93c5fd;
}
.course-title {
  font-size: 16px;
  font-weight: 700;
  color: #fff;
  margin-bottom: 8px;
  line-height: 1.4;
}
.course-intro {
  font-size: 13px;
  color: rgba(255,255,255,.5);
  line-height: 1.6;
  margin-bottom: 16px;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.course-price {
  font-size: 20px;
  font-weight: 800;
  color: #60a5fa;
}
.course-price.free { color: #4ade80; }

/* ─── Skeleton ──────────────────────────────────────────── */
.skeleton-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}
.skeleton-card {
  border-radius: var(--radius);
  background: linear-gradient(90deg, #e8e8e8 25%, #f0f0f0 50%, #e8e8e8 75%);
  background-size: 200% 100%;
  animation: shimmer 1.5s infinite;
  aspect-ratio: 3/4;
}
.skeleton-card.dark {
  background: linear-gradient(90deg, rgba(255,255,255,.06) 25%, rgba(255,255,255,.1) 50%, rgba(255,255,255,.06) 75%);
  background-size: 200% 100%;
}
@keyframes shimmer {
  from { background-position: 200% 0; }
  to   { background-position: -200% 0; }
}
.plan-loading { text-align: center; color: var(--c-text-sub); padding: 40px; }

/* ─── Membership ────────────────────────────────────────── */
.membership-section { background: var(--c-bg); }
.benefits-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  margin-bottom: 60px;
}
.benefit-card {
  background: var(--c-surface);
  border-radius: var(--radius);
  padding: 28px 24px;
  border: 1px solid var(--c-border);
  box-shadow: var(--shadow-sm);
  text-align: center;
  transition: transform .3s, box-shadow .3s;
}
.benefit-card:hover { transform: translateY(-4px); box-shadow: var(--shadow); }
.benefit-icon { font-size: 32px; margin-bottom: 14px; }
.benefit-card h3 { font-size: 15px; font-weight: 700; margin-bottom: 8px; }
.benefit-card p  { font-size: 13px; color: var(--c-text-sub); line-height: 1.6; }
.plans-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  margin-bottom: 60px;
}
.plan-card {
  background: var(--c-surface);
  border-radius: var(--radius);
  padding: 28px 20px 24px;
  border: 1.5px solid var(--c-border);
  text-align: center;
  position: relative;
  transition: transform .3s, box-shadow .3s, border-color .3s;
}
.plan-card:hover { transform: translateY(-4px); box-shadow: var(--shadow); }
.plan-card.featured {
  border-color: var(--c-accent);
  background: linear-gradient(160deg, #eff6ff, #fff);
  box-shadow: 0 0 0 4px rgba(37,99,235,.08);
}
.plan-badge {
  position: absolute;
  top: -12px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--c-accent);
  color: #fff;
  font-size: 11px;
  font-weight: 700;
  padding: 4px 12px;
  border-radius: 20px;
  white-space: nowrap;
}
.plan-name { font-size: 18px; font-weight: 700; margin-bottom: 6px; }
.plan-valid { font-size: 12px; color: var(--c-text-sub); margin-bottom: 20px; }
.plan-price {
  font-size: 36px;
  font-weight: 900;
  letter-spacing: -.03em;
  color: var(--c-accent);
  margin-bottom: 4px;
}
.plan-unit { font-size: 14px; color: var(--c-text-sub); margin-bottom: 20px; }
.plan-cta {
  display: block;
  background: var(--c-accent-lt);
  color: var(--c-accent);
  font-size: 14px;
  font-weight: 600;
  padding: 10px;
  border-radius: 10px;
  text-align: center;
  transition: background .2s;
}
.plan-card.featured .plan-cta {
  background: var(--c-accent);
  color: #fff;
}
.plan-cta:hover { opacity: .85; }
.philosophy-block {
  position: relative;
  text-align: center;
  padding: 48px 40px;
  background: linear-gradient(135deg, #eff6ff, #f0fdf4);
  border-radius: var(--radius-lg);
  border: 1px solid var(--c-border);
  overflow: hidden;
}
.philosophy-quote {
  font-family: Georgia, serif;
  font-size: 80px;
  color: var(--c-accent);
  opacity: .15;
  line-height: 1;
  user-select: none;
}
.philosophy-quote.right { text-align: right; }
.philosophy-text {
  font-size: 20px;
  font-weight: 600;
  line-height: 1.7;
  color: var(--c-text);
  margin: -20px 0;
  position: relative;
  z-index: 1;
}

/* ─── About ──────────────────────────────────────────────── */
.features-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  margin-bottom: 72px;
}
.feature-item {
  background: rgba(255,255,255,.07);
  border: 1px solid rgba(255,255,255,.13);
  border-radius: var(--radius);
  padding: 28px 22px;
  transition: transform .25s, background .25s, box-shadow .25s;
  cursor: default;
}
.feature-item:hover { background: rgba(255,255,255,.13); transform: translateY(-5px); box-shadow: 0 14px 36px rgba(0,0,0,.4); border-color: rgba(255,255,255,.22); }
.feature-icon { font-size: 32px; margin-bottom: 14px; }
.feature-item h3 { font-size: 16px; font-weight: 700; color: #fff; margin-bottom: 8px; }
.feature-item p  { font-size: 13px; color: rgba(255,255,255,.7); line-height: 1.6; }
.timeline-wrap { max-width: 640px; margin: 0 auto; }
.timeline-title {
  font-size: 20px;
  font-weight: 700;
  color: #fff;
  margin-bottom: 32px;
  text-align: center;
}
.timeline { display: flex; flex-direction: column; gap: 0; position: relative; }
.timeline::before {
  content: '';
  position: absolute;
  left: 80px;
  top: 8px; bottom: 8px;
  width: 1px;
  background: rgba(255,255,255,.15);
}
.tl-item {
  display: grid;
  grid-template-columns: 80px 20px 1fr;
  gap: 0 16px;
  align-items: flex-start;
  padding-bottom: 28px;
}
.tl-year {
  text-align: right;
  font-size: 13px;
  font-weight: 700;
  color: rgba(255,255,255,.4);
  padding-top: 2px;
  padding-right: 4px;
}
.tl-dot {
  width: 10px; height: 10px;
  border-radius: 50%;
  background: rgba(255,255,255,.2);
  border: 2px solid rgba(255,255,255,.3);
  margin-top: 4px;
  flex-shrink: 0;
}
.tl-dot.active {
  background: var(--c-accent);
  border-color: var(--c-accent);
  box-shadow: 0 0 12px rgba(37,99,235,.6);
}
.tl-text {
  font-size: 14px;
  color: rgba(255,255,255,.65);
  line-height: 1.6;
}

/* ─── Contact ────────────────────────────────────────────── */
.contact-section { background: var(--c-bg); }
.contact-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}
.contact-card {
  background: var(--c-surface);
  border-radius: var(--radius);
  padding: 32px 28px;
  border: 1px solid var(--c-border);
  box-shadow: var(--shadow-sm);
  text-align: center;
  transition: transform .25s, box-shadow .25s, border-color .25s;
  cursor: default;
}
.contact-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow);
  border-color: var(--c-accent);
}
.contact-card-icon { font-size: 36px; margin-bottom: 16px; }
.contact-card h3 { font-size: 18px; font-weight: 700; margin-bottom: 12px; }
.contact-card p {
  font-size: 14px;
  color: var(--c-text-sub);
  line-height: 1.8;
  margin-bottom: 20px;
}
.qr-placeholder { display: flex; justify-content: center; }
.qr-box {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
}
.qr-tip {
  font-size: 12px;
  color: var(--c-text-sub);
  font-weight: 500;
}
.qr-img {
  width: 140px;
  height: 140px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--c-border);
  object-fit: cover;
}
.qr-fallback {
  width: 140px;
  height: 140px;
  border-radius: var(--radius-sm);
  border: 2px dashed var(--c-border);
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-size: 32px;
  color: var(--c-text-sub);
}
.qr-fallback-text {
  font-size: 12px;
  text-align: center;
  line-height: 1.5;
  font-size: 12px;
}
.location-tags {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  justify-content: center;
  margin-bottom: 12px;
}
.loc-tag {
  background: var(--c-bg);
  border: 1px solid var(--c-border);
  border-radius: 20px;
  font-size: 12px;
  font-weight: 500;
  padding: 4px 12px;
  color: var(--c-text-sub);
}
.location-note {
  font-size: 12px;
  color: #b0b0b8;
  margin-top: 0;
}

/* ─── Footer ─────────────────────────────────────────────── */
.footer {
  background: var(--c-bg-dark);
  color: rgba(255,255,255,.5);
  padding: 56px 0 24px;
}
.footer-top {
  display: flex;
  gap: 60px;
  justify-content: space-between;
  margin-bottom: 40px;
  padding-bottom: 40px;
  border-bottom: 1px solid rgba(255,255,255,.08);
}
.footer-brand { flex: 0 0 220px; }
.footer-logo-img {
  width: 24px; height: 24px;
  border-radius: 6px;
  object-fit: contain;
  margin-bottom: 2px;
}
.footer-logo { display: block; font-size: 14px; font-weight: 700; color: #fff; }
.footer-slogan { font-size: 13px; margin-top: 8px; color: rgba(255,255,255,.4); }
.footer-links-group { display: flex; gap: 48px; }
.footer-col { display: flex; flex-direction: column; gap: 10px; }
.footer-col-title { font-size: 12px; font-weight: 700; text-transform: uppercase; letter-spacing: .08em; color: rgba(255,255,255,.3); margin-bottom: 4px; }
.footer-col a { font-size: 14px; color: rgba(255,255,255,.5); transition: color .2s; }
.footer-col a:hover { color: #fff; }
.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 12px;
  color: rgba(255,255,255,.25);
  flex-wrap: wrap;
  gap: 8px;
}
.footer-icp {
  color: rgba(255,255,255,.25);
  transition: color .2s;
}
.footer-icp:hover { color: rgba(255,255,255,.5); }

/* ─── 可点击卡片 cursor ──────────────────────────────────── */
.activity-card, .course-card {
  cursor: pointer;
}

/* ─── 弹窗 Modal ─────────────────────────────────────────── */
#previewModal {
  display: none;
  position: fixed;
  inset: 0;
  z-index: 500;
  align-items: center;
  justify-content: center;
}
#previewModal.open { display: flex; }
.modal-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(0,0,0,.6);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}
.modal-box {
  position: relative;
  background: var(--c-surface);
  border-radius: var(--radius-lg);
  max-width: 520px;
  width: calc(100% - 32px);
  max-height: 88vh;
  overflow-y: auto;
  box-shadow: var(--shadow-lg);
  animation: modalIn .35s cubic-bezier(.16,1,.3,1);
}
@keyframes modalIn {
  from { opacity: 0; transform: scale(.92) translateY(20px); }
  to   { opacity: 1; transform: none; }
}
.modal-close {
  position: sticky;
  top: 12px;
  float: right;
  margin: 12px 12px 0 0;
  width: 32px; height: 32px;
  border-radius: 50%;
  border: none;
  background: rgba(0,0,0,.08);
  color: var(--c-text);
  font-size: 14px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 2;
  transition: background .2s;
}
.modal-close:hover { background: rgba(0,0,0,.15); }
.modal-cover {
  width: 100%;
  aspect-ratio: 16/9;
  object-fit: cover;
  border-radius: var(--radius-lg) var(--radius-lg) 0 0;
  display: block;
}
.modal-body { padding: 20px 24px 28px; }
.modal-tags { display: flex; gap: 8px; margin-bottom: 12px; flex-wrap: wrap; }
.modal-tag {
  font-size: 11px;
  font-weight: 700;
  padding: 3px 10px;
  border-radius: 20px;
  letter-spacing: .03em;
}
.tag-audience { background: #fef3c7; color: #92400e; }
.tag-status   { background: var(--c-accent-lt); color: var(--c-accent); }
.modal-title  { font-size: 22px; font-weight: 800; line-height: 1.3; margin-bottom: 12px; }
.modal-meta-row {
  display: flex; gap: 16px; flex-wrap: wrap;
  font-size: 14px; color: var(--c-text-sub); margin-bottom: 14px;
}
.modal-rating { display: flex; align-items: center; gap: 8px; margin-bottom: 12px; }
.modal-rating-stars { color: #f59e0b; font-size: 16px; letter-spacing: 1px; }
.modal-rating-score { font-size: 16px; font-weight: 700; color: var(--c-text); }
.modal-rating-count { font-size: 13px; color: var(--c-text-sub); }
.modal-price-row { display: flex; align-items: baseline; gap: 12px; margin-bottom: 16px; }
.modal-price { font-size: 28px; font-weight: 800; color: var(--c-accent); }
.modal-price.free { color: #16a34a; }
.modal-member-price {
  font-size: 13px; font-weight: 600;
  color: #ea580c;
  background: #fff7ed;
  padding: 3px 10px;
  border-radius: 20px;
}
.modal-intro { font-size: 15px; color: var(--c-text-sub); margin-bottom: 14px; line-height: 1.7; }
.modal-desc {
  font-size: 14px;
  color: var(--c-text-sub);
  line-height: 1.75;
  margin-bottom: 20px;
}
.modal-desc img { max-width: 100%; border-radius: var(--radius-sm); }
.modal-mp-tip {
  display: flex;
  align-items: center;
  gap: 16px;
  background: var(--c-bg);
  border-radius: var(--radius);
  padding: 14px 18px;
  border: 1px solid var(--c-border);
}
.modal-qr { width: 64px; height: 64px; border-radius: 8px; flex-shrink: 0; object-fit: cover; }
.modal-mp-title { font-size: 14px; font-weight: 700; margin-bottom: 4px; }
.modal-mp-sub { font-size: 12px; color: var(--c-text-sub); }

/* ─── Gray / Past Section ───────────────────────────────── */
.gray-section { background: #f0f0f2; }

/* ─── Past Highlights ───────────────────────────────────── */
.past-section { }

.past-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
  margin-bottom: 0;
}
.past-item {
  border-radius: var(--radius);
  overflow: hidden;
  position: relative;
  cursor: pointer;
  background: var(--c-bg);
  height: 220px;
}
.past-item img {
  width: 100%;
  height: 100%;
  display: block;
  object-fit: cover;
  transition: transform .4s ease;
}
.past-item:hover img { transform: scale(1.04); }
.past-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(to top, rgba(0,0,0,.72) 0%, rgba(0,0,0,.12) 55%, transparent 100%);
  display: flex;
  align-items: flex-end;
  padding: 12px 14px;
  pointer-events: none;
}
.past-overlay-title {
  font-size: 12px;
  font-weight: 600;
  color: #fff;
  line-height: 1.45;
  text-shadow: 0 1px 4px rgba(0,0,0,.5);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

/* skeleton */
.past-skeleton-wrap {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
}
.past-skeleton {
  break-inside: avoid;
  margin-bottom: 14px;
  border-radius: var(--radius);
  height: 180px;
  background: linear-gradient(90deg,#d8d8da 25%,#e4e4e6 50%,#d8d8da 75%);
  background-size: 200% 100%;
  animation: shimmer 1.5s infinite;
}
.past-skeleton.tall { height: 260px; }

.past-footer { text-align: center; margin-top: 36px; }
.past-load-more {
  background: transparent;
  border: 1.5px solid var(--c-border);
  color: var(--c-text-sub);
  font-size: 14px;
  font-weight: 600;
  padding: 12px 32px;
  border-radius: 50px;
  cursor: pointer;
  transition: all .2s;
}
.past-load-more:hover {
  border-color: var(--c-accent);
  color: var(--c-accent);
}
.past-load-more:disabled {
  opacity: .4;
  cursor: default;
}

/* ─── Responsive ─────────────────────────────────────────── */
@media (max-width: 900px) {
  .past-grid, .past-skeleton-wrap { grid-template-columns: repeat(2, 1fr); }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .stat-item:nth-child(3)::before { display: none; }
  .activities-grid { grid-template-columns: repeat(2, 1fr); }
  .skeleton-grid   { grid-template-columns: repeat(2, 1fr); }
  .courses-grid    { grid-template-columns: 1fr; }
  .benefits-row    { grid-template-columns: repeat(2, 1fr); }
  .plans-grid      { grid-template-columns: repeat(2, 1fr); }
  .features-grid   { grid-template-columns: repeat(2, 1fr); }
  .contact-grid    { grid-template-columns: 1fr; }
  .footer-top      { flex-direction: column; gap: 32px; }
  .footer-brand    { flex: 0 0 auto; }
}

@media (max-width: 600px) {
  .past-grid, .past-skeleton-wrap { grid-template-columns: repeat(2, 1fr); gap: 8px; }
  .past-item { height: 160px; }
  .nav-links, .nav-cta { display: none; }
  .nav-hamburger { display: flex; }
  .stats-grid    { grid-template-columns: repeat(2, 1fr); }
  .activities-grid { grid-template-columns: 1fr; }
  .skeleton-grid   { grid-template-columns: 1fr; }
  .benefits-row    { grid-template-columns: 1fr; }
  .plans-grid      { grid-template-columns: repeat(2, 1fr); }
  .features-grid   { grid-template-columns: 1fr; }
  .footer-links-group { flex-wrap: wrap; gap: 28px; }
  .hero-title { font-size: 48px; }
  .hero-br { display: none; }
  .course-card { flex-direction: column; }
  .course-cover-wrap { flex: 0 0 160px; border-radius: var(--radius) var(--radius) 0 0; }
  .course-body { border-left: 1px solid rgba(255,255,255,.08); border-top: none; border-radius: 0 0 var(--radius) var(--radius); }
  .timeline::before { left: 72px; }
}

@media (max-width: 400px) {
  .plans-grid { grid-template-columns: 1fr; }
}

/* ── 英文晨报 ─────────────────────────────────────────── */
.dr-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  margin-bottom: 36px;
}
.dr-card {
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  padding: 24px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  transition: border-color .2s, transform .2s;
}
.dr-card:hover { border-color: var(--c-accent); transform: translateY(-2px); }
.dr-card-date { font-size: 12px; color: var(--c-text-sub); }
.dr-card-title { font-size: 17px; font-weight: 700; line-height: 1.45; }
.dr-card-summary { font-size: 14px; color: var(--c-text-sub); line-height: 1.6; flex: 1; }
.dr-card-tag { font-size: 13px; color: var(--c-accent); font-weight: 600; margin-top: auto; }
.dr-skeleton {
  height: 160px;
  border-radius: var(--radius);
  background: linear-gradient(90deg, var(--c-surface) 25%, rgba(255,255,255,.06) 50%, var(--c-surface) 75%);
  background-size: 200% 100%;
  animation: shimmer 1.4s infinite;
}
.dr-footer { text-align: center; }
.dr-footer-tip { font-size: 14px; color: var(--c-text-sub); margin-bottom: 16px; }
.dr-qr-wrap { display: inline-flex; flex-direction: column; align-items: center; gap: 8px; font-size: 13px; color: var(--c-text-sub); }
.dr-qr { width: 96px; height: 96px; border-radius: 8px; }
.dr-empty { text-align: center; color: var(--c-text-sub); padding: 40px 0; grid-column: 1/-1; }
@media (max-width: 900px) { .dr-grid { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 600px) { .dr-grid { grid-template-columns: 1fr; } }

/* ─── 加入我们 ───────────────────────────────────────────── */
.join-section { background: var(--c-bg-dark); padding: 100px 0 80px; }
.join-section .section-title { color: #ffffff; }
.join-section .section-desc { color: rgba(255,255,255,.72); }
.join-section .section-tag { background: rgba(37,99,235,.25); color: #93c5fd; }
.join-grid {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 24px;
  margin-bottom: 40px;
}
.join-role-card {
  background: rgba(255,255,255,.08);
  border: 1px solid rgba(255,255,255,.18);
  border-radius: 16px;
  padding: 32px 28px;
  transition: transform .25s, background .25s, box-shadow .25s, border-color .25s;
  cursor: default;
}
.join-role-card:hover {
  transform: translateY(-5px);
  background: rgba(255,255,255,.13);
  border-color: rgba(255,255,255,.3);
  box-shadow: 0 14px 40px rgba(0,0,0,.45);
}
.join-role-icon { font-size: 44px; margin-bottom: 16px; }
.join-role-title { font-size: 20px; font-weight: 700; color: #ffffff; margin-bottom: 4px; }
.join-role-en { font-size: 13px; color: #818cf8; margin-bottom: 20px; }
.join-req-list { list-style: none; display: flex; flex-direction: column; gap: 12px; }
.join-req-list li { font-size: 14px; color: rgba(255,255,255,.82); padding-left: 16px; position: relative; line-height: 1.6; }
.join-req-list li::before { content: '•'; position: absolute; left: 0; color: #818cf8; }
.join-benefit-card {
  background: linear-gradient(135deg, rgba(79,70,229,.35), rgba(124,58,237,.28));
  border: 1px solid rgba(129,140,248,.45);
  border-radius: 16px;
  padding: 32px 28px;
  transition: transform .25s, box-shadow .25s, border-color .25s;
  cursor: default;
}
.join-benefit-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 14px 40px rgba(79,70,229,.4);
  border-color: rgba(129,140,248,.7);
}
.join-benefit-title { font-size: 18px; font-weight: 700; color: #ffffff; margin-bottom: 20px; }
.join-benefit-list { display: flex; flex-direction: column; gap: 14px; }
.join-benefit-item { font-size: 14px; color: rgba(255,255,255,.82); line-height: 1.6; }
.join-apply-box {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: rgba(255,255,255,.08);
  border: 1px solid rgba(255,255,255,.18);
  border-radius: 16px;
  padding: 36px 40px;
  gap: 32px;
  transition: transform .25s, box-shadow .25s, border-color .25s;
}
.join-apply-box:hover {
  transform: translateY(-3px);
  box-shadow: 0 10px 32px rgba(0,0,0,.35);
  border-color: rgba(255,255,255,.28);
}
.join-apply-text h3 { font-size: 20px; font-weight: 700; color: #ffffff; margin-bottom: 12px; }
.join-apply-text p { font-size: 14px; color: rgba(255,255,255,.78); line-height: 1.7; }
.join-apply-text strong { color: #a5b4fc; }
.join-qr-wrap { display: flex; flex-direction: column; align-items: center; gap: 8px; flex-shrink: 0; }
.join-qr { width: 100px; height: 100px; border-radius: 8px; }
.join-qr-wrap p { font-size: 12px; color: rgba(255,255,255,.6); }
@media (max-width: 900px) { .join-grid { grid-template-columns: 1fr 1fr; } }
@media (max-width: 600px) {
  .join-grid { grid-template-columns: 1fr; }
  .join-apply-box { flex-direction: column; }
}