/* ============================================================
   红桃视频 - 主样式表
   Modern Minimal High-end Style
   ============================================================ */

:root {
  --primary: #e8294a;
  --primary-light: #ff6b85;
  --primary-dark: #c0162f;
  --accent: #c9a96e;
  --bg: #fafafa;
  --bg-white: #ffffff;
  --bg-light: #f5f5f7;
  --text-dark: #1a1a2e;
  --text-mid: #4a4a6a;
  --text-light: #8a8aaa;
  --border: #e8e8f0;
  --shadow-sm: 0 2px 12px rgba(0,0,0,0.06);
  --shadow-md: 0 8px 32px rgba(0,0,0,0.10);
  --shadow-lg: 0 20px 60px rgba(0,0,0,0.12);
  --radius: 12px;
  --radius-lg: 20px;
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --font: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', Arial, sans-serif;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; font-size: 16px; }

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text-dark);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--primary); }
img { max-width: 100%; height: auto; display: block; }
ul, ol { list-style: none; }

/* ---- HEADER ---- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255,255,255,0.95);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border);
  transition: box-shadow var(--transition);
}
.site-header.scrolled { box-shadow: var(--shadow-sm); }

.header-inner {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 24px;
  height: 68px;
  display: flex;
  align-items: center;
  gap: 40px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}
.logo-icon {
  width: 36px;
  height: 36px;
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-size: 18px;
  font-weight: 700;
}
.logo-text {
  font-size: 18px;
  font-weight: 700;
  color: var(--text-dark);
  letter-spacing: -0.3px;
}
.logo-text span { color: var(--primary); }

.main-nav {
  display: flex;
  align-items: center;
  gap: 4px;
  flex: 1;
}
.main-nav a {
  padding: 8px 14px;
  border-radius: 8px;
  font-size: 14px;
  font-weight: 500;
  color: var(--text-mid);
  transition: all var(--transition);
  white-space: nowrap;
}
.main-nav a:hover, .main-nav a.active {
  background: rgba(232,41,74,0.08);
  color: var(--primary);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-shrink: 0;
}
.btn-login {
  padding: 8px 20px;
  border-radius: 8px;
  font-size: 14px;
  font-weight: 500;
  color: var(--text-mid);
  border: 1px solid var(--border);
  cursor: pointer;
  transition: all var(--transition);
  background: transparent;
}
.btn-login:hover { border-color: var(--primary); color: var(--primary); }

.btn-primary {
  padding: 8px 20px;
  border-radius: 8px;
  font-size: 14px;
  font-weight: 600;
  color: #fff;
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  border: none;
  cursor: pointer;
  transition: all var(--transition);
  box-shadow: 0 4px 14px rgba(232,41,74,0.3);
}
.btn-primary:hover {
  transform: translateY(-1px);
  box-shadow: 0 6px 20px rgba(232,41,74,0.4);
  color: #fff;
}

/* ---- SEARCH BAR ---- */
.search-bar-wrap {
  background: var(--bg-light);
  border-bottom: 1px solid var(--border);
  padding: 12px 24px;
}
.search-bar-inner {
  max-width: 1280px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  gap: 12px;
}
.search-form {
  display: flex;
  align-items: center;
  background: var(--bg-white);
  border: 1px solid var(--border);
  border-radius: 24px;
  padding: 8px 20px;
  gap: 10px;
  flex: 1;
  max-width: 600px;
  transition: all var(--transition);
}
.search-form:focus-within {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(232,41,74,0.1);
}
.search-form input {
  border: none;
  outline: none;
  background: transparent;
  font-size: 14px;
  color: var(--text-dark);
  flex: 1;
  font-family: var(--font);
}
.search-form input::placeholder { color: var(--text-light); }
.search-icon {
  color: var(--text-light);
  font-size: 16px;
  cursor: pointer;
  transition: color var(--transition);
}
.search-icon:hover { color: var(--primary); }
.search-btn {
  padding: 8px 24px;
  background: var(--primary);
  color: #fff;
  border: none;
  border-radius: 20px;
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition);
  font-family: var(--font);
}
.search-btn:hover { background: var(--primary-dark); }

/* ---- HERO SECTION ---- */
.hero {
  position: relative;
  min-height: 600px;
  display: flex;
  align-items: center;
  overflow: hidden;
  background: var(--text-dark);
}
.hero-bg {
  position: absolute;
  inset: 0;
  background-size: cover;
  background-position: center;
  opacity: 0.45;
  transition: transform 8s ease;
}
.hero:hover .hero-bg { transform: scale(1.03); }
.hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(26,26,46,0.85) 0%, rgba(232,41,74,0.25) 100%);
}
.hero-content {
  position: relative;
  z-index: 2;
  max-width: 1280px;
  margin: 0 auto;
  padding: 80px 24px;
  width: 100%;
}
.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: rgba(232,41,74,0.2);
  border: 1px solid rgba(232,41,74,0.4);
  color: #ff8fa3;
  padding: 6px 16px;
  border-radius: 20px;
  font-size: 13px;
  font-weight: 500;
  margin-bottom: 24px;
  backdrop-filter: blur(8px);
}
.hero h1 {
  font-size: clamp(2rem, 5vw, 3.5rem);
  font-weight: 800;
  color: #fff;
  line-height: 1.2;
  margin-bottom: 20px;
  letter-spacing: -1px;
}
.hero h1 em {
  font-style: normal;
  color: var(--primary-light);
}
.hero-desc {
  font-size: 1.1rem;
  color: rgba(255,255,255,0.75);
  max-width: 560px;
  margin-bottom: 36px;
  line-height: 1.8;
}
.hero-actions {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}
.btn-hero-primary {
  padding: 14px 36px;
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  color: #fff;
  border-radius: 12px;
  font-size: 16px;
  font-weight: 700;
  border: none;
  cursor: pointer;
  transition: all var(--transition);
  box-shadow: 0 8px 24px rgba(232,41,74,0.4);
  display: inline-flex;
  align-items: center;
  gap: 8px;
}
.btn-hero-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 32px rgba(232,41,74,0.5);
  color: #fff;
}
.btn-hero-secondary {
  padding: 14px 36px;
  background: rgba(255,255,255,0.12);
  color: #fff;
  border-radius: 12px;
  font-size: 16px;
  font-weight: 600;
  border: 1px solid rgba(255,255,255,0.3);
  cursor: pointer;
  transition: all var(--transition);
  backdrop-filter: blur(8px);
  display: inline-flex;
  align-items: center;
  gap: 8px;
}
.btn-hero-secondary:hover {
  background: rgba(255,255,255,0.2);
  color: #fff;
}
.hero-stats {
  display: flex;
  gap: 40px;
  margin-top: 56px;
  padding-top: 40px;
  border-top: 1px solid rgba(255,255,255,0.15);
  flex-wrap: wrap;
}
.hero-stat-item { color: #fff; }
.hero-stat-num {
  font-size: 2rem;
  font-weight: 800;
  color: var(--primary-light);
  display: block;
  line-height: 1;
  margin-bottom: 4px;
}
.hero-stat-label { font-size: 13px; color: rgba(255,255,255,0.6); }

/* ---- SECTION COMMON ---- */
.section { padding: 80px 24px; }
.section-inner { max-width: 1280px; margin: 0 auto; }
.section-header { text-align: center; margin-bottom: 56px; }
.section-tag {
  display: inline-block;
  background: rgba(232,41,74,0.08);
  color: var(--primary);
  padding: 4px 14px;
  border-radius: 20px;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 1px;
  text-transform: uppercase;
  margin-bottom: 16px;
}
.section-title {
  font-size: clamp(1.6rem, 3vw, 2.4rem);
  font-weight: 800;
  color: var(--text-dark);
  letter-spacing: -0.5px;
  margin-bottom: 16px;
}
.section-subtitle {
  font-size: 1rem;
  color: var(--text-light);
  max-width: 560px;
  margin: 0 auto;
  line-height: 1.8;
}

/* ---- ABOUT SECTION ---- */
.about-section { background: var(--bg-white); }
.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: center;
}
.about-text h2 {
  font-size: 2rem;
  font-weight: 800;
  color: var(--text-dark);
  margin-bottom: 20px;
  letter-spacing: -0.5px;
}
.about-text p {
  color: var(--text-mid);
  line-height: 1.9;
  margin-bottom: 16px;
  font-size: 1rem;
}
.about-features {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin-top: 32px;
}
.about-feature-item {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 16px;
  background: var(--bg-light);
  border-radius: var(--radius);
}
.feature-icon {
  width: 40px;
  height: 40px;
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-size: 18px;
  flex-shrink: 0;
}
.feature-text h4 { font-size: 14px; font-weight: 700; color: var(--text-dark); margin-bottom: 4px; }
.feature-text p { font-size: 12px; color: var(--text-light); line-height: 1.5; }
.about-image {
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
}
.about-image img { width: 100%; height: 400px; object-fit: cover; }

/* ---- VIDEO CARDS ---- */
.videos-section { background: var(--bg); }
.videos-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 24px;
}
.video-card {
  background: var(--bg-white);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: all var(--transition);
  cursor: pointer;
}
.video-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-md);
}
.video-thumb {
  position: relative;
  aspect-ratio: 16/9;
  overflow: hidden;
  background: var(--text-dark);
}
.video-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition);
}
.video-card:hover .video-thumb img { transform: scale(1.06); }
.video-play-btn {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(0,0,0,0);
  transition: background var(--transition);
}
.video-card:hover .video-play-btn { background: rgba(0,0,0,0.35); }
.play-icon {
  width: 56px;
  height: 56px;
  background: rgba(255,255,255,0.95);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transform: scale(0.8);
  transition: all var(--transition);
  box-shadow: 0 4px 20px rgba(0,0,0,0.3);
}
.video-card:hover .play-icon {
  opacity: 1;
  transform: scale(1);
}
.play-icon::after {
  content: '';
  width: 0;
  height: 0;
  border-style: solid;
  border-width: 10px 0 10px 18px;
  border-color: transparent transparent transparent var(--primary);
  margin-left: 4px;
}
.video-duration {
  position: absolute;
  bottom: 10px;
  right: 10px;
  background: rgba(0,0,0,0.75);
  color: #fff;
  font-size: 12px;
  padding: 2px 8px;
  border-radius: 4px;
  font-weight: 500;
}
.video-tag {
  position: absolute;
  top: 10px;
  left: 10px;
  background: var(--primary);
  color: #fff;
  font-size: 11px;
  padding: 3px 10px;
  border-radius: 4px;
  font-weight: 600;
}
.video-info { padding: 16px; }
.video-title {
  font-size: 15px;
  font-weight: 700;
  color: var(--text-dark);
  margin-bottom: 8px;
  line-height: 1.5;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.video-meta {
  display: flex;
  align-items: center;
  gap: 16px;
  font-size: 12px;
  color: var(--text-light);
}
.video-meta span { display: flex; align-items: center; gap: 4px; }
.video-author {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-top: 12px;
  padding-top: 12px;
  border-top: 1px solid var(--border);
}
.author-avatar {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  object-fit: cover;
}
.author-name { font-size: 12px; color: var(--text-mid); font-weight: 500; }

/* ---- BOARDS SECTION ---- */
.boards-section { background: var(--bg-white); }
.boards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 20px;
}
.board-card {
  padding: 28px;
  background: var(--bg-light);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border);
  transition: all var(--transition);
  cursor: pointer;
  position: relative;
  overflow: hidden;
}
.board-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--primary), var(--primary-light));
  transform: scaleX(0);
  transition: transform var(--transition);
}
.board-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); background: var(--bg-white); }
.board-card:hover::before { transform: scaleX(1); }
.board-icon {
  width: 52px;
  height: 52px;
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  border-radius: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 24px;
  margin-bottom: 16px;
}
.board-name {
  font-size: 16px;
  font-weight: 700;
  color: var(--text-dark);
  margin-bottom: 8px;
}
.board-desc {
  font-size: 13px;
  color: var(--text-light);
  line-height: 1.6;
  margin-bottom: 16px;
}
.board-stats {
  display: flex;
  gap: 16px;
  font-size: 12px;
  color: var(--text-light);
}
.board-stats strong { color: var(--primary); font-weight: 700; }

/* ---- TOPICS SECTION ---- */
.topics-section { background: var(--bg); }
.topics-list { display: flex; flex-direction: column; gap: 16px; }
.topic-item {
  background: var(--bg-white);
  border-radius: var(--radius);
  padding: 20px 24px;
  display: flex;
  align-items: center;
  gap: 20px;
  border: 1px solid var(--border);
  transition: all var(--transition);
  cursor: pointer;
}
.topic-item:hover { border-color: var(--primary); box-shadow: var(--shadow-sm); transform: translateX(4px); }
.topic-rank {
  width: 36px;
  height: 36px;
  border-radius: 10px;
  background: var(--bg-light);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 14px;
  font-weight: 800;
  color: var(--text-light);
  flex-shrink: 0;
}
.topic-item:nth-child(1) .topic-rank { background: linear-gradient(135deg, #ffd700, #ffaa00); color: #fff; }
.topic-item:nth-child(2) .topic-rank { background: linear-gradient(135deg, #c0c0c0, #a0a0a0); color: #fff; }
.topic-item:nth-child(3) .topic-rank { background: linear-gradient(135deg, #cd7f32, #a05a20); color: #fff; }
.topic-content { flex: 1; min-width: 0; }
.topic-title {
  font-size: 15px;
  font-weight: 600;
  color: var(--text-dark);
  margin-bottom: 6px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.topic-meta { display: flex; gap: 16px; font-size: 12px; color: var(--text-light); }
.topic-meta span { display: flex; align-items: center; gap: 4px; }
.topic-tag {
  padding: 4px 12px;
  background: rgba(232,41,74,0.08);
  color: var(--primary);
  border-radius: 20px;
  font-size: 12px;
  font-weight: 500;
  flex-shrink: 0;
}

/* ---- STATS SECTION ---- */
.stats-section {
  background: linear-gradient(135deg, var(--text-dark) 0%, #2d1b3e 100%);
  padding: 80px 24px;
}
.stats-grid {
  max-width: 1280px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 40px;
  text-align: center;
}
.stat-item {}
.stat-num {
  font-size: 3rem;
  font-weight: 900;
  color: var(--primary-light);
  display: block;
  line-height: 1;
  margin-bottom: 8px;
  letter-spacing: -1px;
}
.stat-label { font-size: 14px; color: rgba(255,255,255,0.6); }
.stat-desc { font-size: 12px; color: rgba(255,255,255,0.4); margin-top: 4px; }

/* ---- REVIEWS SECTION ---- */
.reviews-section { background: var(--bg-light); }
.reviews-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 24px;
}
.review-card {
  background: var(--bg-white);
  border-radius: var(--radius-lg);
  padding: 28px;
  box-shadow: var(--shadow-sm);
  transition: all var(--transition);
}
.review-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); }
.review-stars { color: #ffc107; font-size: 16px; margin-bottom: 16px; letter-spacing: 2px; }
.review-text {
  font-size: 14px;
  color: var(--text-mid);
  line-height: 1.8;
  margin-bottom: 20px;
  font-style: italic;
}
.review-author {
  display: flex;
  align-items: center;
  gap: 12px;
  padding-top: 16px;
  border-top: 1px solid var(--border);
}
.review-avatar {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  object-fit: cover;
}
.review-name { font-size: 14px; font-weight: 700; color: var(--text-dark); }
.review-role { font-size: 12px; color: var(--text-light); }

/* ---- FAQ SECTION ---- */
.faq-section { background: var(--bg-white); }
.faq-list { max-width: 800px; margin: 0 auto; display: flex; flex-direction: column; gap: 12px; }
.faq-item {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: all var(--transition);
}
.faq-item.open { border-color: var(--primary); box-shadow: 0 0 0 3px rgba(232,41,74,0.08); }
.faq-question {
  padding: 20px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  cursor: pointer;
  font-size: 15px;
  font-weight: 600;
  color: var(--text-dark);
  gap: 16px;
  user-select: none;
  transition: background var(--transition);
}
.faq-question:hover { background: var(--bg-light); }
.faq-item.open .faq-question { background: rgba(232,41,74,0.04); color: var(--primary); }
.faq-arrow {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: var(--bg-light);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  transition: all var(--transition);
  font-size: 12px;
  color: var(--text-light);
}
.faq-item.open .faq-arrow { background: var(--primary); color: #fff; transform: rotate(180deg); }
.faq-answer {
  padding: 0 24px;
  max-height: 0;
  overflow: hidden;
  transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
  font-size: 14px;
  color: var(--text-mid);
  line-height: 1.8;
}
.faq-item.open .faq-answer { max-height: 300px; padding: 0 24px 20px; }

/* ---- JOIN SECTION ---- */
.join-section {
  background: linear-gradient(135deg, var(--primary) 0%, #ff6b85 50%, var(--accent) 100%);
  padding: 80px 24px;
  text-align: center;
}
.join-inner { max-width: 640px; margin: 0 auto; }
.join-section h2 {
  font-size: 2.4rem;
  font-weight: 800;
  color: #fff;
  margin-bottom: 16px;
  letter-spacing: -0.5px;
}
.join-section p { font-size: 1.1rem; color: rgba(255,255,255,0.85); margin-bottom: 36px; line-height: 1.7; }
.join-form {
  display: flex;
  gap: 12px;
  max-width: 480px;
  margin: 0 auto;
}
.join-form input {
  flex: 1;
  padding: 14px 20px;
  border-radius: 12px;
  border: 2px solid rgba(255,255,255,0.3);
  background: rgba(255,255,255,0.15);
  color: #fff;
  font-size: 15px;
  outline: none;
  transition: all var(--transition);
  font-family: var(--font);
  backdrop-filter: blur(8px);
}
.join-form input::placeholder { color: rgba(255,255,255,0.6); }
.join-form input:focus { border-color: rgba(255,255,255,0.7); background: rgba(255,255,255,0.2); }
.btn-join {
  padding: 14px 28px;
  background: #fff;
  color: var(--primary);
  border-radius: 12px;
  font-size: 15px;
  font-weight: 700;
  border: none;
  cursor: pointer;
  transition: all var(--transition);
  white-space: nowrap;
  font-family: var(--font);
}
.btn-join:hover { transform: translateY(-2px); box-shadow: 0 8px 24px rgba(0,0,0,0.2); }

/* ---- FOOTER ---- */
.site-footer {
  background: var(--text-dark);
  color: rgba(255,255,255,0.7);
  padding: 60px 24px 0;
}
.footer-inner {
  max-width: 1280px;
  margin: 0 auto;
}
.footer-top {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 48px;
  padding-bottom: 48px;
  border-bottom: 1px solid rgba(255,255,255,0.1);
}
.footer-brand .logo-text { color: #fff; font-size: 20px; margin-bottom: 16px; display: block; }
.footer-brand p { font-size: 13px; line-height: 1.8; max-width: 280px; }
.footer-col h4 {
  font-size: 14px;
  font-weight: 700;
  color: #fff;
  margin-bottom: 20px;
  letter-spacing: 0.5px;
}
.footer-col ul { display: flex; flex-direction: column; gap: 10px; }
.footer-col ul li a {
  font-size: 13px;
  color: rgba(255,255,255,0.55);
  transition: color var(--transition);
}
.footer-col ul li a:hover { color: var(--primary-light); }
.footer-bottom {
  padding: 24px 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 13px;
  color: rgba(255,255,255,0.4);
  flex-wrap: wrap;
  gap: 12px;
}
.footer-bottom a { color: rgba(255,255,255,0.4); }
.footer-bottom a:hover { color: var(--primary-light); }
.footer-social { display: flex; gap: 12px; }
.social-link {
  width: 36px;
  height: 36px;
  border-radius: 8px;
  background: rgba(255,255,255,0.08);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 14px;
  color: rgba(255,255,255,0.5);
  transition: all var(--transition);
}
.social-link:hover { background: var(--primary); color: #fff; }

/* ---- BREADCRUMB ---- */
.breadcrumb {
  background: var(--bg-white);
  border-bottom: 1px solid var(--border);
  padding: 12px 24px;
}
.breadcrumb-inner {
  max-width: 1280px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  color: var(--text-light);
}
.breadcrumb-inner a { color: var(--text-light); }
.breadcrumb-inner a:hover { color: var(--primary); }
.breadcrumb-inner .sep { color: var(--border); }
.breadcrumb-inner .current { color: var(--text-dark); font-weight: 500; }

/* ---- PAGE HEADER ---- */
.page-hero {
  background: linear-gradient(135deg, var(--text-dark) 0%, #2d1b3e 100%);
  padding: 60px 24px;
  text-align: center;
}
.page-hero h1 {
  font-size: 2.4rem;
  font-weight: 800;
  color: #fff;
  margin-bottom: 12px;
  letter-spacing: -0.5px;
}
.page-hero p { font-size: 1rem; color: rgba(255,255,255,0.65); max-width: 560px; margin: 0 auto; }

/* ---- UTILITY ---- */
.container { max-width: 1280px; margin: 0 auto; padding: 0 24px; }
.text-center { text-align: center; }
.mb-8 { margin-bottom: 8px; }
.mb-16 { margin-bottom: 16px; }
.mb-24 { margin-bottom: 24px; }
.mb-32 { margin-bottom: 32px; }
.mt-32 { margin-top: 32px; }
.mt-48 { margin-top: 48px; }

/* ---- MOBILE NAV TOGGLE ---- */
.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 8px;
}
.nav-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--text-dark);
  border-radius: 2px;
  transition: all var(--transition);
}

/* ---- RESPONSIVE ---- */
@media (max-width: 1024px) {
  .about-grid { grid-template-columns: 1fr; gap: 40px; }
  .about-image { order: -1; }
  .footer-top { grid-template-columns: 1fr 1fr; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
  .main-nav { display: none; position: absolute; top: 68px; left: 0; right: 0; background: var(--bg-white); flex-direction: column; padding: 16px; border-bottom: 1px solid var(--border); box-shadow: var(--shadow-md); z-index: 99; }
  .main-nav.open { display: flex; }
  .main-nav a { padding: 12px 16px; }
  .nav-toggle { display: flex; }
  .header-inner { position: relative; }
  .hero { min-height: 480px; }
  .hero-stats { gap: 24px; }
  .hero-stat-num { font-size: 1.5rem; }
  .footer-top { grid-template-columns: 1fr; gap: 32px; }
  .footer-bottom { flex-direction: column; text-align: center; }
  .join-form { flex-direction: column; }
  .boards-grid { grid-template-columns: 1fr 1fr; }
  .videos-grid { grid-template-columns: 1fr 1fr; }
  .about-features { grid-template-columns: 1fr; }
}

@media (max-width: 480px) {
  .section { padding: 56px 16px; }
  .boards-grid { grid-template-columns: 1fr; }
  .videos-grid { grid-template-columns: 1fr; }
  .reviews-grid { grid-template-columns: 1fr; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); gap: 24px; }
  .hero h1 { font-size: 1.8rem; }
  .hero-actions { flex-direction: column; }
  .btn-hero-primary, .btn-hero-secondary { width: 100%; justify-content: center; }
  .search-bar-inner { flex-direction: column; }
  .search-form { max-width: 100%; }
}

/* ---- ANIMATIONS ---- */
@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(24px); }
  to { opacity: 1; transform: translateY(0); }
}
.animate-in { animation: fadeInUp 0.6s ease both; }
.delay-1 { animation-delay: 0.1s; }
.delay-2 { animation-delay: 0.2s; }
.delay-3 { animation-delay: 0.3s; }

/* ---- INNER PAGE LAYOUT ---- */
.inner-layout {
  max-width: 1280px;
  margin: 0 auto;
  padding: 40px 24px;
  display: grid;
  grid-template-columns: 1fr 320px;
  gap: 32px;
}
.inner-main {}
.inner-sidebar {}
.sidebar-card {
  background: var(--bg-white);
  border-radius: var(--radius);
  padding: 24px;
  border: 1px solid var(--border);
  margin-bottom: 24px;
}
.sidebar-card h3 {
  font-size: 15px;
  font-weight: 700;
  color: var(--text-dark);
  margin-bottom: 16px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--border);
}
.sidebar-list { display: flex; flex-direction: column; gap: 12px; }
.sidebar-list li a {
  font-size: 13px;
  color: var(--text-mid);
  display: flex;
  align-items: center;
  gap: 8px;
  transition: color var(--transition);
}
.sidebar-list li a:hover { color: var(--primary); }
.sidebar-list li a::before { content: '▶'; font-size: 8px; color: var(--primary); }

@media (max-width: 1024px) {
  .inner-layout { grid-template-columns: 1fr; }
  .inner-sidebar { display: none; }
}