/* ========================================
   偷拍 - 原创主题样式表
   Brand: 偷拍 | Domain: nzxa6t.cn
   Version: 1.0.0
   ======================================== */

/* ---- CSS Variables (原创配色方案) ---- */
:root {
  --primary: #E8317A;
  --primary-dark: #C01F62;
  --primary-light: #FF6FA8;
  --secondary: #7C3AED;
  --secondary-light: #A855F7;
  --accent: #FFD700;
  --accent2: #FF8C42;
  --bg-main: #FFF0F6;
  --bg-dark: #1A0A12;
  --bg-card: #FFFFFF;
  --text-dark: #1E1A2E;
  --text-muted: #6B7280;
  --text-light: #F9FAFB;
  --border: #F3D0E0;
  --shadow: rgba(232, 49, 122, 0.15);
  --shadow-dark: rgba(0,0,0,0.2);
  --gradient-main: linear-gradient(135deg, #E8317A 0%, #7C3AED 100%);
  --gradient-hero: linear-gradient(135deg, #1A0A12 0%, #2D1B4E 50%, #1A0A12 100%);
  --gradient-card: linear-gradient(180deg, rgba(232,49,122,0.05) 0%, rgba(124,58,237,0.05) 100%);
  --radius: 12px;
  --radius-lg: 20px;
  --radius-xl: 30px;
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

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

body {
  font-family: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', Arial, sans-serif;
  background-color: var(--bg-main);
  color: var(--text-dark);
  line-height: 1.7;
  overflow-x: hidden;
}

a {
  color: var(--primary);
  text-decoration: none;
  transition: var(--transition);
}

a:hover {
  color: var(--primary-dark);
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

ul, ol {
  list-style: none;
}

/* ---- Typography ---- */
h1, h2, h3, h4, h5, h6 {
  font-weight: 700;
  line-height: 1.3;
  color: var(--text-dark);
}

h1 { font-size: clamp(1.8rem, 4vw, 3rem); }
h2 { font-size: clamp(1.5rem, 3vw, 2.2rem); }
h3 { font-size: clamp(1.2rem, 2.5vw, 1.6rem); }
h4 { font-size: 1.2rem; }
h5 { font-size: 1.05rem; }
h6 { font-size: 0.95rem; }

p {
  margin-bottom: 1rem;
  color: var(--text-muted);
}

/* ---- Layout ---- */
.container {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 20px;
}

.section {
  padding: 70px 0;
}

.section-dark {
  background: var(--bg-dark);
  color: var(--text-light);
}

.section-dark h2,
.section-dark h3,
.section-dark p {
  color: var(--text-light);
}

.section-gradient {
  background: var(--gradient-main);
  color: #fff;
}

/* ---- Section Header ---- */
.section-header {
  text-align: center;
  margin-bottom: 50px;
}

.section-header .section-tag {
  display: inline-block;
  background: var(--gradient-main);
  color: #fff;
  font-size: 0.8rem;
  font-weight: 600;
  padding: 4px 14px;
  border-radius: 20px;
  letter-spacing: 1px;
  text-transform: uppercase;
  margin-bottom: 12px;
}

.section-header h2 {
  font-size: clamp(1.6rem, 3.5vw, 2.4rem);
  margin-bottom: 14px;
}

.section-header p {
  max-width: 600px;
  margin: 0 auto;
  font-size: 1.05rem;
}

.section-header .divider {
  width: 60px;
  height: 4px;
  background: var(--gradient-main);
  border-radius: 2px;
  margin: 16px auto 0;
}

/* ---- Header / Navigation ---- */
#site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(255, 240, 246, 0.95);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  box-shadow: 0 2px 20px var(--shadow);
  transition: var(--transition);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 70px;
  gap: 20px;
}

.site-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}

.site-logo img {
  height: 44px;
  width: auto;
  border-radius: 8px;
}

.site-logo .logo-text {
  font-size: 1.4rem;
  font-weight: 800;
  background: var(--gradient-main);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  white-space: nowrap;
}

/* ---- Navigation ---- */
.main-nav {
  display: flex;
  align-items: center;
  gap: 4px;
}

.main-nav a {
  color: var(--text-dark);
  font-size: 0.95rem;
  font-weight: 500;
  padding: 8px 14px;
  border-radius: 8px;
  white-space: nowrap;
  position: relative;
  transition: var(--transition);
}

.main-nav a::after {
  content: '';
  position: absolute;
  bottom: 4px;
  left: 50%;
  transform: translateX(-50%);
  width: 0;
  height: 2px;
  background: var(--gradient-main);
  border-radius: 1px;
  transition: var(--transition);
}

.main-nav a:hover,
.main-nav a.active {
  color: var(--primary);
  background: rgba(232, 49, 122, 0.08);
}

.main-nav a:hover::after,
.main-nav a.active::after {
  width: 60%;
}

/* ---- Search Box ---- */
.header-search {
  display: flex;
  align-items: center;
  background: #fff;
  border: 1.5px solid var(--border);
  border-radius: 25px;
  padding: 6px 16px;
  gap: 8px;
  min-width: 200px;
  max-width: 280px;
  transition: var(--transition);
}

.header-search:focus-within {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(232, 49, 122, 0.15);
}

.header-search input {
  border: none;
  outline: none;
  background: transparent;
  font-size: 0.9rem;
  color: var(--text-dark);
  width: 100%;
  font-family: inherit;
}

.header-search input::placeholder {
  color: var(--text-muted);
}

.header-search button {
  background: none;
  border: none;
  cursor: pointer;
  color: var(--primary);
  padding: 0;
  display: flex;
  align-items: center;
  font-size: 1rem;
}

/* ---- Mobile Menu Toggle ---- */
.menu-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 6px;
  border: none;
  background: none;
}

.menu-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--text-dark);
  border-radius: 2px;
  transition: var(--transition);
}

/* ---- Breadcrumb ---- */
.breadcrumb {
  background: #fff;
  padding: 12px 0;
  border-bottom: 1px solid var(--border);
}

.breadcrumb-list {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.9rem;
}

.breadcrumb-list li::after {
  content: '›';
  color: var(--text-muted);
  margin-left: 8px;
}

.breadcrumb-list li:last-child::after {
  display: none;
}

.breadcrumb-list a {
  color: var(--text-muted);
}

.breadcrumb-list a:hover {
  color: var(--primary);
}

.breadcrumb-list .current {
  color: var(--primary);
  font-weight: 500;
}

/* ---- Hero Banner ---- */
.hero-section {
  position: relative;
  min-height: 580px;
  display: flex;
  align-items: center;
  overflow: hidden;
  background: var(--gradient-hero);
}

.hero-bg {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.hero-bg img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.35;
}

.hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(90deg, rgba(26,10,18,0.9) 0%, rgba(26,10,18,0.5) 60%, rgba(26,10,18,0.2) 100%);
  z-index: 1;
}

.hero-content {
  position: relative;
  z-index: 2;
  max-width: 620px;
  padding: 60px 0;
}

.hero-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: rgba(232, 49, 122, 0.2);
  border: 1px solid rgba(232, 49, 122, 0.4);
  color: #FF8EC4;
  font-size: 0.85rem;
  font-weight: 600;
  padding: 5px 14px;
  border-radius: 20px;
  margin-bottom: 20px;
  letter-spacing: 0.5px;
}

.hero-tag::before {
  content: '▶';
  font-size: 0.7rem;
}

.hero-content h1 {
  color: #fff;
  font-size: clamp(2rem, 5vw, 3.5rem);
  line-height: 1.2;
  margin-bottom: 20px;
  text-shadow: 0 2px 20px rgba(0,0,0,0.5);
}

.hero-content h1 span {
  background: var(--gradient-main);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-content p {
  color: rgba(255,255,255,0.8);
  font-size: 1.1rem;
  margin-bottom: 30px;
}

.hero-stats {
  display: flex;
  gap: 30px;
  margin-bottom: 35px;
}

.hero-stat {
  text-align: center;
}

.hero-stat .num {
  display: block;
  font-size: 1.8rem;
  font-weight: 800;
  color: var(--primary-light);
  line-height: 1;
}

.hero-stat .label {
  font-size: 0.8rem;
  color: rgba(255,255,255,0.6);
  margin-top: 4px;
}

.hero-buttons {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
}

/* ---- Buttons ---- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 28px;
  border-radius: 25px;
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
  border: none;
  text-decoration: none;
  white-space: nowrap;
}

.btn-primary {
  background: var(--gradient-main);
  color: #fff;
  box-shadow: 0 4px 20px rgba(232, 49, 122, 0.4);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(232, 49, 122, 0.5);
  color: #fff;
}

.btn-outline {
  background: transparent;
  color: #fff;
  border: 2px solid rgba(255,255,255,0.5);
}

.btn-outline:hover {
  background: rgba(255,255,255,0.1);
  border-color: #fff;
  color: #fff;
}

.btn-secondary {
  background: var(--secondary);
  color: #fff;
}

.btn-secondary:hover {
  background: var(--secondary-light);
  color: #fff;
}

.btn-sm {
  padding: 8px 18px;
  font-size: 0.85rem;
}

.btn-lg {
  padding: 15px 36px;
  font-size: 1.05rem;
}

/* ---- Video Cards ---- */
.video-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 24px;
}

.video-card {
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: 0 4px 20px var(--shadow);
  transition: var(--transition);
  cursor: pointer;
  border: 1px solid var(--border);
}

.video-card:hover {
  transform: translateY(-6px);
  box-shadow: 0 12px 40px rgba(232, 49, 122, 0.25);
}

.video-thumb {
  position: relative;
  overflow: hidden;
  aspect-ratio: 16/9;
  background: #1a0a12;
}

.video-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.4s ease;
}

.video-card:hover .video-thumb img {
  transform: scale(1.05);
}

.play-btn {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 54px;
  height: 54px;
  background: rgba(232, 49, 122, 0.9);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: var(--transition);
  box-shadow: 0 4px 20px rgba(0,0,0,0.4);
}

.play-btn::after {
  content: '';
  border-left: 18px solid #fff;
  border-top: 11px solid transparent;
  border-bottom: 11px solid transparent;
  margin-left: 4px;
}

.video-card:hover .play-btn {
  transform: translate(-50%, -50%) scale(1.1);
  background: var(--primary);
}

.video-duration {
  position: absolute;
  bottom: 8px;
  right: 10px;
  background: rgba(0,0,0,0.75);
  color: #fff;
  font-size: 0.78rem;
  padding: 2px 7px;
  border-radius: 4px;
  font-weight: 500;
}

.video-badge {
  position: absolute;
  top: 10px;
  left: 10px;
  background: var(--gradient-main);
  color: #fff;
  font-size: 0.72rem;
  font-weight: 700;
  padding: 3px 10px;
  border-radius: 4px;
  letter-spacing: 0.5px;
}

.video-info {
  padding: 16px;
}

.video-info h3 {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-dark);
  margin-bottom: 8px;
  line-height: 1.4;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.video-meta {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 0.82rem;
  color: var(--text-muted);
}

.video-meta span {
  display: flex;
  align-items: center;
  gap: 4px;
}

.video-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: 10px;
}

.tag {
  background: rgba(232, 49, 122, 0.1);
  color: var(--primary);
  font-size: 0.75rem;
  padding: 3px 10px;
  border-radius: 12px;
  font-weight: 500;
}

/* ---- Feature Cards ---- */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 24px;
}

.feature-card {
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  padding: 30px 24px;
  text-align: center;
  border: 1px solid var(--border);
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}

.feature-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: var(--gradient-main);
  transform: scaleX(0);
  transition: var(--transition);
}

.feature-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 10px 30px var(--shadow);
  border-color: var(--primary-light);
}

.feature-card:hover::before {
  transform: scaleX(1);
}

.feature-icon {
  width: 64px;
  height: 64px;
  background: var(--gradient-main);
  border-radius: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.8rem;
  margin: 0 auto 18px;
  box-shadow: 0 4px 16px rgba(232, 49, 122, 0.3);
}

.feature-card h3 {
  font-size: 1.1rem;
  margin-bottom: 10px;
  color: var(--text-dark);
}

.feature-card p {
  font-size: 0.9rem;
  color: var(--text-muted);
  margin: 0;
}

/* ---- Expert Cards ---- */
.expert-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 28px;
}

.expert-card {
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: 0 4px 20px var(--shadow);
  border: 1px solid var(--border);
  transition: var(--transition);
}

.expert-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 12px 40px rgba(232, 49, 122, 0.2);
}

.expert-avatar {
  position: relative;
  height: 220px;
  overflow: hidden;
}

.expert-avatar img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: top;
  transition: transform 0.4s ease;
}

.expert-card:hover .expert-avatar img {
  transform: scale(1.05);
}

.expert-badge {
  position: absolute;
  bottom: 12px;
  left: 12px;
  background: var(--gradient-main);
  color: #fff;
  font-size: 0.78rem;
  font-weight: 600;
  padding: 4px 12px;
  border-radius: 20px;
}

.expert-info {
  padding: 20px;
}

.expert-info h3 {
  font-size: 1.15rem;
  margin-bottom: 4px;
}

.expert-title {
  color: var(--primary);
  font-size: 0.88rem;
  font-weight: 600;
  margin-bottom: 10px;
}

.expert-desc {
  font-size: 0.88rem;
  color: var(--text-muted);
  margin-bottom: 14px;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.expert-awards {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: 14px;
}

.award-tag {
  background: rgba(255, 215, 0, 0.15);
  color: #B8860B;
  font-size: 0.75rem;
  padding: 3px 10px;
  border-radius: 10px;
  font-weight: 500;
}

.expert-actions {
  display: flex;
  gap: 10px;
}

.expert-actions .btn {
  flex: 1;
  justify-content: center;
  padding: 9px 14px;
  font-size: 0.85rem;
}

/* ---- Partner Logos ---- */
.partner-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
  gap: 20px;
  align-items: center;
}

.partner-item {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: var(--transition);
  min-height: 80px;
}

.partner-item:hover {
  border-color: var(--primary-light);
  box-shadow: 0 4px 16px var(--shadow);
  transform: translateY(-2px);
}

.partner-item span {
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--text-muted);
  text-align: center;
}

/* ---- How-To Steps ---- */
.steps-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 24px;
  position: relative;
}

.step-card {
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  padding: 28px 22px;
  text-align: center;
  border: 1px solid var(--border);
  position: relative;
}

.step-number {
  width: 50px;
  height: 50px;
  background: var(--gradient-main);
  color: #fff;
  font-size: 1.4rem;
  font-weight: 800;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 16px;
  box-shadow: 0 4px 16px rgba(232, 49, 122, 0.3);
}

.step-card h4 {
  font-size: 1rem;
  margin-bottom: 8px;
}

.step-card p {
  font-size: 0.88rem;
  margin: 0;
}

/* ---- FAQ ---- */
.faq-list {
  max-width: 860px;
  margin: 0 auto;
}

.faq-item {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  margin-bottom: 14px;
  overflow: hidden;
  transition: var(--transition);
}

.faq-item.active {
  border-color: var(--primary-light);
  box-shadow: 0 4px 16px var(--shadow);
}

.faq-question {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px 22px;
  cursor: pointer;
  font-weight: 600;
  font-size: 1rem;
  color: var(--text-dark);
  gap: 12px;
}

.faq-question .faq-icon {
  width: 28px;
  height: 28px;
  background: rgba(232, 49, 122, 0.1);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  color: var(--primary);
  font-size: 1.1rem;
  transition: var(--transition);
}

.faq-item.active .faq-icon {
  background: var(--gradient-main);
  color: #fff;
  transform: rotate(45deg);
}

.faq-answer {
  display: none;
  padding: 0 22px 18px;
  color: var(--text-muted);
  font-size: 0.95rem;
  line-height: 1.7;
}

.faq-item.active .faq-answer {
  display: block;
}

/* ---- Reviews ---- */
.reviews-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 24px;
}

.review-card {
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  padding: 24px;
  border: 1px solid var(--border);
  transition: var(--transition);
  position: relative;
}

.review-card::before {
  content: '"';
  position: absolute;
  top: 10px;
  right: 20px;
  font-size: 5rem;
  color: rgba(232, 49, 122, 0.1);
  font-family: Georgia, serif;
  line-height: 1;
}

.review-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 10px 30px var(--shadow);
  border-color: var(--primary-light);
}

.review-stars {
  display: flex;
  gap: 3px;
  margin-bottom: 12px;
}

.review-stars span {
  color: var(--accent);
  font-size: 1rem;
}

.review-text {
  font-size: 0.93rem;
  color: var(--text-muted);
  line-height: 1.7;
  margin-bottom: 16px;
}

.reviewer {
  display: flex;
  align-items: center;
  gap: 12px;
}

.reviewer-avatar {
  width: 42px;
  height: 42px;
  border-radius: 50%;
  background: var(--gradient-main);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-weight: 700;
  font-size: 1rem;
  flex-shrink: 0;
}

.reviewer-info .name {
  font-weight: 600;
  font-size: 0.95rem;
  color: var(--text-dark);
}

.reviewer-info .meta {
  font-size: 0.8rem;
  color: var(--text-muted);
}

/* ---- Contact Section ---- */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
  align-items: start;
}

.contact-info h3 {
  font-size: 1.4rem;
  margin-bottom: 20px;
}

.contact-item {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  margin-bottom: 18px;
}

.contact-icon {
  width: 44px;
  height: 44px;
  background: rgba(232, 49, 122, 0.1);
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  flex-shrink: 0;
}

.contact-text .label {
  font-size: 0.82rem;
  color: var(--text-muted);
  margin-bottom: 2px;
}

.contact-text .value {
  font-weight: 600;
  color: var(--text-dark);
  font-size: 0.95rem;
}

.social-links {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  margin-top: 20px;
}

.social-link {
  display: flex;
  align-items: center;
  gap: 8px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 25px;
  padding: 8px 16px;
  font-size: 0.88rem;
  font-weight: 500;
  color: var(--text-dark);
  transition: var(--transition);
}

.social-link:hover {
  background: var(--gradient-main);
  color: #fff;
  border-color: transparent;
}

/* ---- QR Codes ---- */
.qr-grid {
  display: flex;
  gap: 24px;
  flex-wrap: wrap;
}

.qr-item {
  text-align: center;
}

.qr-item img {
  width: 130px;
  height: 130px;
  border-radius: 10px;
  border: 2px solid var(--border);
  object-fit: cover;
}

.qr-item p {
  font-size: 0.82rem;
  margin-top: 8px;
  color: var(--text-muted);
}

/* ---- Stats Bar ---- */
.stats-bar {
  background: var(--gradient-main);
  padding: 30px 0;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  text-align: center;
}

.stat-item .num {
  display: block;
  font-size: 2.2rem;
  font-weight: 800;
  color: #fff;
  line-height: 1;
}

.stat-item .label {
  font-size: 0.88rem;
  color: rgba(255,255,255,0.8);
  margin-top: 6px;
}

/* ---- Community Section ---- */
.community-features {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.comm-feature {
  background: rgba(255,255,255,0.05);
  border: 1px solid rgba(255,255,255,0.1);
  border-radius: var(--radius-lg);
  padding: 28px 22px;
  text-align: center;
  transition: var(--transition);
}

.comm-feature:hover {
  background: rgba(255,255,255,0.1);
  transform: translateY(-4px);
}

.comm-icon {
  font-size: 2.5rem;
  margin-bottom: 14px;
  display: block;
}

.comm-feature h4 {
  color: #fff;
  margin-bottom: 8px;
}

.comm-feature p {
  color: rgba(255,255,255,0.7);
  font-size: 0.88rem;
  margin: 0;
}

/* ---- AI Section ---- */
.ai-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
  align-items: center;
}

.ai-features-list {
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.ai-feature-item {
  display: flex;
  gap: 16px;
  align-items: flex-start;
}

.ai-feature-icon {
  width: 48px;
  height: 48px;
  background: var(--gradient-main);
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.4rem;
  flex-shrink: 0;
  box-shadow: 0 4px 12px rgba(232, 49, 122, 0.3);
}

.ai-feature-text h4 {
  font-size: 1rem;
  margin-bottom: 4px;
}

.ai-feature-text p {
  font-size: 0.88rem;
  margin: 0;
}

.ai-visual {
  position: relative;
  border-radius: var(--radius-xl);
  overflow: hidden;
  box-shadow: 0 20px 60px rgba(0,0,0,0.3);
}

.ai-visual img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* ---- Share Buttons ---- */
.share-buttons {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  align-items: center;
}

.share-btn {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 9px 18px;
  border-radius: 25px;
  font-size: 0.88rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
  border: none;
  color: #fff;
}

.share-btn.wechat { background: #07C160; }
.share-btn.weibo { background: #E6162D; }
.share-btn.douyin { background: #010101; }
.share-btn.bilibili { background: #00A1D6; }

.share-btn:hover {
  transform: translateY(-2px);
  filter: brightness(1.1);
  box-shadow: 0 4px 16px rgba(0,0,0,0.2);
}

/* ---- Footer ---- */
#site-footer {
  background: var(--bg-dark);
  color: rgba(255,255,255,0.8);
  padding: 60px 0 0;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
  padding-bottom: 40px;
  border-bottom: 1px solid rgba(255,255,255,0.1);
}

.footer-brand .logo-text {
  font-size: 1.5rem;
  font-weight: 800;
  background: var(--gradient-main);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 14px;
  display: block;
}

.footer-brand p {
  color: rgba(255,255,255,0.6);
  font-size: 0.9rem;
  margin-bottom: 20px;
}

.footer-col h5 {
  color: #fff;
  font-size: 1rem;
  margin-bottom: 16px;
  position: relative;
  padding-bottom: 10px;
}

.footer-col h5::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 30px;
  height: 2px;
  background: var(--gradient-main);
  border-radius: 1px;
}

.footer-links {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-links a {
  color: rgba(255,255,255,0.6);
  font-size: 0.9rem;
  transition: var(--transition);
}

.footer-links a:hover {
  color: var(--primary-light);
  padding-left: 4px;
}

.footer-bottom {
  padding: 20px 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
}

.footer-bottom p {
  color: rgba(255,255,255,0.4);
  font-size: 0.85rem;
  margin: 0;
}

.footer-bottom .update-time {
  color: rgba(255,255,255,0.4);
  font-size: 0.82rem;
}

/* ---- Video Player Modal ---- */
.video-modal {
  display: none;
  position: fixed;
  inset: 0;
  z-index: 9999;
  background: rgba(0,0,0,0.9);
  align-items: center;
  justify-content: center;
}

.video-modal.active {
  display: flex;
}

.modal-inner {
  position: relative;
  width: 90%;
  max-width: 900px;
  background: #000;
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.modal-close {
  position: absolute;
  top: 12px;
  right: 12px;
  z-index: 10;
  width: 36px;
  height: 36px;
  background: rgba(255,255,255,0.2);
  border: none;
  border-radius: 50%;
  color: #fff;
  font-size: 1.2rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: var(--transition);
}

.modal-close:hover {
  background: var(--primary);
}

.modal-video {
  width: 100%;
  aspect-ratio: 16/9;
}

/* ---- Lazy Load ---- */
img[data-src] {
  opacity: 0;
  transition: opacity 0.3s;
}

img.loaded {
  opacity: 1;
}

/* ---- Scrollbar ---- */
::-webkit-scrollbar {
  width: 6px;
}

::-webkit-scrollbar-track {
  background: var(--bg-main);
}

::-webkit-scrollbar-thumb {
  background: var(--primary-light);
  border-radius: 3px;
}

/* ---- Animations ---- */
@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(30px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes pulse {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.05); }
}

@keyframes shimmer {
  0% { background-position: -1000px 0; }
  100% { background-position: 1000px 0; }
}

.fade-in-up {
  animation: fadeInUp 0.6s ease forwards;
}

/* ---- Responsive ---- */
@media (max-width: 1024px) {
  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }

  .contact-grid {
    grid-template-columns: 1fr;
  }

  .ai-grid {
    grid-template-columns: 1fr;
  }

  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .community-features {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  .section {
    padding: 50px 0;
  }

  .main-nav {
    display: none;
    position: absolute;
    top: 70px;
    left: 0;
    right: 0;
    background: rgba(255, 240, 246, 0.98);
    flex-direction: column;
    padding: 16px;
    border-bottom: 1px solid var(--border);
    box-shadow: 0 8px 20px var(--shadow);
    gap: 4px;
  }

  .main-nav.open {
    display: flex;
  }

  .main-nav a {
    width: 100%;
    padding: 12px 16px;
  }

  .menu-toggle {
    display: flex;
  }

  .header-search {
    display: none;
  }

  .hero-section {
    min-height: 480px;
  }

  .hero-stats {
    gap: 20px;
  }

  .video-grid {
    grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  }

  .expert-grid {
    grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 28px;
  }

  .footer-bottom {
    flex-direction: column;
    text-align: center;
  }

  .community-features {
    grid-template-columns: 1fr;
  }

  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 14px;
  }

  .hero-buttons {
    flex-direction: column;
  }

  .hero-buttons .btn {
    width: 100%;
    justify-content: center;
  }

  .video-grid {
    grid-template-columns: 1fr;
  }

  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .share-buttons {
    justify-content: center;
  }
}

/* ---- Inner Page Specific ---- */
.page-hero {
  background: var(--gradient-hero);
  padding: 50px 0;
  text-align: center;
  color: #fff;
}

.page-hero h1 {
  color: #fff;
  margin-bottom: 12px;
}

.page-hero p {
  color: rgba(255,255,255,0.75);
  max-width: 600px;
  margin: 0 auto;
}

.filter-bar {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  align-items: center;
  padding: 20px 0;
  border-bottom: 1px solid var(--border);
  margin-bottom: 30px;
}

.filter-btn {
  padding: 7px 18px;
  border-radius: 20px;
  font-size: 0.88rem;
  font-weight: 500;
  cursor: pointer;
  border: 1.5px solid var(--border);
  background: var(--bg-card);
  color: var(--text-muted);
  transition: var(--transition);
}

.filter-btn.active,
.filter-btn:hover {
  background: var(--gradient-main);
  color: #fff;
  border-color: transparent;
}

/* ---- Pagination ---- */
.pagination {
  display: flex;
  justify-content: center;
  gap: 8px;
  margin-top: 40px;
}

.page-btn {
  width: 38px;
  height: 38px;
  border-radius: 8px;
  border: 1.5px solid var(--border);
  background: var(--bg-card);
  color: var(--text-dark);
  font-size: 0.9rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: var(--transition);
}

.page-btn.active,
.page-btn:hover {
  background: var(--gradient-main);
  color: #fff;
  border-color: transparent;
}

/* ---- Utility Classes ---- */
.text-center { text-align: center; }
.text-primary { color: var(--primary); }
.text-gradient {
  background: var(--gradient-main);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.mt-1 { margin-top: 8px; }
.mt-2 { margin-top: 16px; }
.mt-3 { margin-top: 24px; }
.mt-4 { margin-top: 32px; }
.mb-1 { margin-bottom: 8px; }
.mb-2 { margin-bottom: 16px; }
.mb-3 { margin-bottom: 24px; }
.mb-4 { margin-bottom: 32px; }
.hidden { display: none; }
.flex { display: flex; }
.flex-center { display: flex; align-items: center; justify-content: center; }
.gap-2 { gap: 16px; }
.w-full { width: 100%; }