/* ========== 基础重置 ========== */
*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  --primary: #FF6B6B;
  --primary-light: #FF8E53;
  --primary-dark: #E85555;
  --primary-bg: rgba(255,107,107,0.08);
  --secondary: #4ECDC4;
  --bg: #FFFFFF;
  --bg-alt: #FFF8F6;
  --bg-dark: #1A1A2E;
  --text: #1A1A2E;
  --text-secondary: #6B7280;
  --text-light: #9CA3AF;
  --border: #F0E6E4;
  --success: #00B894;
  --warning: #FDCB6E;
  --danger: #E17055;
  --info: #74B9FF;
  --radius: 16px;
  --radius-sm: 10px;
  --radius-xs: 6px;
  --shadow: 0 4px 24px rgba(255,107,107,0.06);
  --shadow-lg: 0 12px 48px rgba(255,107,107,0.1);
  --shadow-xl: 0 24px 64px rgba(255,107,107,0.12);
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

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

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

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

a { text-decoration: none; color: inherit; }
img { max-width: 100%; }

/* ========== 导航栏 ========== */
.navbar {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 1000;
  padding: 16px 0;
  transition: var(--transition);
  background: transparent;
}

.navbar.scrolled {
  background: rgba(255,255,255,0.92);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  box-shadow: 0 1px 12px rgba(255,107,107,0.06);
  padding: 10px 0;
}

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  font-size: 1.4rem;
  font-weight: 800;
  display: flex;
  align-items: center;
  gap: 10px;
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.logo-icon { flex-shrink: 0; }

.nav-links {
  display: flex;
  list-style: none;
  gap: 28px;
}

.nav-links a {
  font-size: 0.88rem;
  font-weight: 500;
  color: var(--text-secondary);
  transition: var(--transition);
  position: relative;
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -4px; left: 0;
  width: 0; height: 2px;
  background: var(--primary);
  border-radius: 1px;
  transition: var(--transition);
}

.nav-links a:hover { color: var(--primary); }
.nav-links a:hover::after { width: 100%; }

.nav-actions {
  display: flex;
  align-items: center;
  gap: 16px;
}

.nav-login {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-secondary);
  transition: var(--transition);
}

.nav-login:hover { color: var(--primary); }

.btn-sm { padding: 8px 20px; font-size: 0.85rem; }
.btn-lg { padding: 16px 36px; font-size: 1.05rem; }
.btn-full { width: 100%; justify-content: center; }

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}

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

/* ========== 通用按钮 ========== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 14px 32px;
  border-radius: 50px;
  font-size: 1rem;
  font-weight: 600;
  transition: var(--transition);
  cursor: pointer;
  border: none;
  font-family: inherit;
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  color: #fff;
  box-shadow: 0 4px 20px rgba(255,107,107,0.35);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(255,107,107,0.45);
}

.btn-outline {
  background: transparent;
  color: var(--primary);
  border: 2px solid var(--primary);
}

.btn-outline:hover {
  background: var(--primary);
  color: #fff;
  transform: translateY(-2px);
}

/* ========== Hero ========== */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding: 120px 0 80px;
  background: linear-gradient(180deg, #FFF0ED 0%, #FFFFFF 100%);
  position: relative;
  overflow: hidden;
}

.hero-bg-shapes {
  position: absolute;
  inset: 0;
  pointer-events: none;
}

.shape { position: absolute; border-radius: 50%; }

.shape-1 {
  top: -150px; right: -100px;
  width: 500px; height: 500px;
  background: radial-gradient(circle, rgba(255,107,107,0.1) 0%, transparent 70%);
}

.shape-2 {
  bottom: -100px; left: -150px;
  width: 400px; height: 400px;
  background: radial-gradient(circle, rgba(78,205,196,0.08) 0%, transparent 70%);
}

.shape-3 {
  top: 40%; right: 20%;
  width: 200px; height: 200px;
  background: radial-gradient(circle, rgba(253,203,110,0.08) 0%, transparent 70%);
}

.hero-container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
  position: relative;
  z-index: 1;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 16px;
  background: rgba(255,107,107,0.08);
  border: 1px solid rgba(255,107,107,0.15);
  border-radius: 50px;
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--primary);
  margin-bottom: 24px;
}

.badge-dot {
  width: 8px; height: 8px;
  border-radius: 50%;
  background: var(--success);
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.4; }
}

.hero-text h1 {
  font-size: 3.5rem;
  font-weight: 900;
  line-height: 1.15;
  margin-bottom: 20px;
  letter-spacing: -0.03em;
}

.gradient-text {
  background: linear-gradient(135deg, var(--primary), var(--primary-light), #FFB347);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-text p {
  font-size: 1.15rem;
  color: var(--text-secondary);
  margin-bottom: 32px;
  max-width: 520px;
  line-height: 1.8;
}

.hero-buttons {
  display: flex;
  gap: 16px;
  margin-bottom: 36px;
}

.hero-trust {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 40px;
}

.trust-avatars { display: flex; }

.trust-avatar {
  width: 36px; height: 36px;
  border-radius: 50%;
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.75rem;
  font-weight: 700;
  border: 2px solid #fff;
  margin-left: -8px;
}

.trust-avatar:first-child { margin-left: 0; }

.trust-text { display: flex; flex-direction: column; gap: 2px; }

.trust-rating { font-size: 0.85rem; color: #F59E0B; font-weight: 600; }
.trust-rating span { color: var(--text); }
.trust-text > span { font-size: 0.8rem; color: var(--text-secondary); }

.hero-stats {
  display: flex;
  gap: 24px;
  align-items: center;
}

.stat { display: flex; flex-direction: column; }

.stat-number {
  font-size: 1.4rem;
  font-weight: 800;
  color: var(--text);
}

.stat-label { font-size: 0.8rem; color: var(--text-secondary); }

.stat-divider {
  width: 1px; height: 36px;
  background: var(--border);
}

/* ========== 手机模型 ========== */
.hero-image {
  display: flex;
  justify-content: center;
  position: relative;
  perspective: 1000px;
}

.phone-mockup {
  width: 280px; height: 580px;
  background: var(--bg-dark);
  border-radius: 40px;
  padding: 12px;
  box-shadow: var(--shadow-xl), 0 0 0 1px rgba(255,255,255,0.1);
  transform: rotateY(-5deg) rotateX(2deg);
  transition: var(--transition-slow);
  position: relative;
}

.phone-mockup:hover { transform: rotateY(0deg) rotateX(0deg); }

.phone-notch {
  position: absolute;
  top: 12px; left: 50%;
  transform: translateX(-50%);
  width: 120px; height: 28px;
  background: var(--bg-dark);
  border-radius: 0 0 16px 16px;
  z-index: 2;
}

.phone-screen {
  width: 100%; height: 100%;
  background: #fff;
  border-radius: 30px;
  padding: 40px 12px 12px;
  overflow: hidden;
}

.screen-status-bar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.7rem;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 8px;
  padding: 0 4px;
}

.status-icons { display: flex; gap: 4px; font-size: 0.6rem; }
.battery { font-size: 0.8rem; }

.screen-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 10px;
  padding: 0 4px;
}

.screen-app-name {
  font-size: 1.1rem;
  font-weight: 800;
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.screen-header-icons { display: flex; gap: 8px; }
.screen-icon { font-size: 1rem; }

/* Stories */
.screen-stories {
  display: flex;
  gap: 10px;
  margin-bottom: 12px;
  padding: 0 4px;
  overflow: hidden;
}

.story-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  font-size: 0.6rem;
  color: var(--text-secondary);
}

.story-ring {
  width: 44px; height: 44px;
  border-radius: 50%;
  padding: 2px;
  background: var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
}

.story-ring.active {
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
}

.story-avatar {
  width: 100%; height: 100%;
  border-radius: 50%;
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.7rem;
  font-weight: 700;
  border: 2px solid #fff;
}

/* Feed */
.screen-feed { display: flex; flex-direction: column; gap: 8px; }

.feed-post {
  background: var(--bg-alt);
  border-radius: var(--radius-xs);
  padding: 10px;
}

.post-header {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 6px;
}

.post-avatar {
  width: 28px; height: 28px;
  border-radius: 50%;
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.65rem;
  font-weight: 700;
  flex-shrink: 0;
}

.post-info { display: flex; flex-direction: column; }
.post-name { font-size: 0.75rem; font-weight: 600; }
.post-meta { font-size: 0.6rem; color: var(--text-light); }

.post-content {
  font-size: 0.72rem;
  line-height: 1.4;
  margin-bottom: 6px;
}

.post-image {
  width: 100%;
  height: 60px;
  background: linear-gradient(135deg, #FFECD2, #FCB69F);
  border-radius: var(--radius-xs);
  margin-bottom: 6px;
}

.post-actions {
  display: flex;
  gap: 12px;
  font-size: 0.65rem;
  color: var(--text-secondary);
}

.post-action { cursor: default; }

/* 浮动卡片 */
.floating-card {
  position: absolute;
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 20px;
  background: #fff;
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-lg);
  z-index: 2;
  animation: float 3s ease-in-out infinite;
}

.floating-card-1 { top: 80px; right: -20px; animation-delay: 0s; }
.floating-card-2 { bottom: 120px; left: -30px; animation-delay: 1.5s; }
.floating-card-3 { bottom: 240px; right: -40px; animation-delay: 0.8s; }

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-10px); }
}

.floating-icon { font-size: 1.5rem; }
.floating-title { font-size: 0.75rem; color: var(--text-secondary); }
.floating-value {
  font-size: 1.2rem;
  font-weight: 800;
  color: var(--primary);
}

/* ========== 合作伙伴 ========== */
.partners {
  padding: 48px 0;
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  background: var(--bg);
}

.partners-label {
  text-align: center;
  font-size: 0.85rem;
  color: var(--text-light);
  margin-bottom: 24px;
  text-transform: uppercase;
  letter-spacing: 1px;
}

.partners-logos {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 48px;
  flex-wrap: wrap;
}

.partner-logo {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--text-light);
  opacity: 0.5;
  transition: var(--transition);
  cursor: default;
}

.partner-logo:hover { opacity: 0.8; }

/* ========== 通用 Section ========== */
.section-header {
  text-align: center;
  margin-bottom: 60px;
}

.section-tag {
  display: inline-block;
  padding: 6px 16px;
  background: var(--primary-bg);
  color: var(--primary);
  border-radius: 50px;
  font-size: 0.85rem;
  font-weight: 600;
  margin-bottom: 16px;
}

.section-header h2 {
  font-size: 2.5rem;
  font-weight: 800;
  margin-bottom: 12px;
  letter-spacing: -0.02em;
}

.section-header p {
  color: var(--text-secondary);
  font-size: 1.1rem;
  line-height: 1.7;
}

/* ========== 功能区域 ========== */
.features { padding: 100px 0; }

.features-highlight { margin-bottom: 64px; }

.feature-highlight-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
  padding: 48px;
  background: var(--bg-alt);
  border-radius: 24px;
  border: 1px solid var(--border);
}

.feature-highlight-text .section-tag { margin-bottom: 12px; }

.feature-highlight-text h3 {
  font-size: 2rem;
  font-weight: 800;
  margin-bottom: 16px;
  letter-spacing: -0.02em;
}

.feature-highlight-text p {
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 24px;
}

.feature-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.feature-list li {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 500;
  font-size: 0.95rem;
}

.feature-list svg { flex-shrink: 0; }

/* AI 可视化 */
.feature-highlight-visual {
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 300px;
}

.ai-visual {
  position: relative;
  width: 280px; height: 280px;
}

.ai-brain {
  position: absolute;
  top: 50%; left: 50%;
  transform: translate(-50%, -50%);
  width: 100px; height: 100px;
}

.brain-ring {
  position: absolute;
  inset: 0;
  border: 2px solid rgba(255,107,107,0.2);
  border-radius: 50%;
  animation: brainPulse 3s ease-in-out infinite;
}

.ring-1 { animation-delay: 0s; }
.ring-2 { inset: -20px; animation-delay: 1s; border-color: rgba(255,107,107,0.15); }
.ring-3 { inset: -40px; animation-delay: 2s; border-color: rgba(255,107,107,0.1); }

@keyframes brainPulse {
  0%, 100% { transform: scale(1); opacity: 1; }
  50% { transform: scale(1.1); opacity: 0.5; }
}

.brain-core {
  position: absolute;
  top: 50%; left: 50%;
  transform: translate(-50%, -50%);
  width: 60px; height: 60px;
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-weight: 800;
  font-size: 1.2rem;
  box-shadow: 0 0 40px rgba(255,107,107,0.4);
}

.ai-nodes { position: absolute; inset: 0; }

.ai-node {
  position: absolute;
  top: 50%; left: 50%;
  transform: translate(calc(-50% + var(--x)), calc(-50% + var(--y)));
  padding: 6px 14px;
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 50px;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--primary);
  box-shadow: var(--shadow);
  animation: nodeFloat 4s ease-in-out infinite;
}

.ai-node:nth-child(2) { animation-delay: 0.5s; }
.ai-node:nth-child(3) { animation-delay: 1s; }
.ai-node:nth-child(4) { animation-delay: 1.5s; }
.ai-node:nth-child(5) { animation-delay: 2s; }

@keyframes nodeFloat {
  0%, 100% { transform: translate(calc(-50% + var(--x)), calc(-50% + var(--y))); }
  50% { transform: translate(calc(-50% + var(--x)), calc(-50% + var(--y) - 6px)); }
}

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

.feature-card {
  padding: 32px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  transition: var(--transition);
}

.feature-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: transparent;
}

.feature-icon-wrap { margin-bottom: 20px; }

.feature-icon {
  width: 52px; height: 52px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  background: var(--primary-bg);
  border-radius: 14px;
}

.feature-card h3 {
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: 10px;
}

.feature-card p {
  color: var(--text-secondary);
  font-size: 0.9rem;
  line-height: 1.6;
  margin-bottom: 12px;
}

.feature-sub-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 4px;
  margin-bottom: 16px;
}

.feature-sub-list li {
  font-size: 0.82rem;
  color: var(--text-secondary);
  padding-left: 14px;
  position: relative;
}

.feature-sub-list li::before {
  content: '';
  position: absolute;
  left: 0; top: 7px;
  width: 5px; height: 5px;
  border-radius: 50%;
  background: var(--primary);
}

.feature-link {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--primary);
  transition: var(--transition);
}

.feature-link:hover { opacity: 0.8; }

/* ========== 社区生态 ========== */
.community {
  padding: 100px 0;
  background: var(--bg-alt);
}

.community-categories {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  margin-bottom: 40px;
}

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

.category-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: var(--primary);
}

.category-card.more-card {
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  color: #fff;
  border-color: transparent;
}

.category-card.more-card p { color: rgba(255,255,255,0.8); }

.category-icon {
  font-size: 2rem;
  margin-bottom: 10px;
}

.category-card h4 {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 4px;
}

.category-card p {
  font-size: 0.8rem;
  color: var(--text-secondary);
}

.category-hot {
  position: absolute;
  top: 12px; right: 12px;
  font-size: 0.7rem;
  font-weight: 600;
}

.community-cta {
  text-align: center;
}

.community-cta p {
  color: var(--text-secondary);
  margin-bottom: 16px;
}

/* ========== 内容生态 ========== */
.content-eco { padding: 100px 0; }

.content-tabs {
  display: flex;
  justify-content: center;
  gap: 8px;
  margin-bottom: 48px;
  flex-wrap: wrap;
}

.content-tab-btn {
  padding: 10px 24px;
  border: 1px solid var(--border);
  border-radius: 50px;
  background: transparent;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-secondary);
  cursor: pointer;
  transition: var(--transition);
  font-family: inherit;
}

.content-tab-btn:hover {
  border-color: var(--primary);
  color: var(--primary);
}

.content-tab-btn.active {
  background: var(--primary);
  border-color: var(--primary);
  color: #fff;
}

.content-panels { max-width: 900px; margin: 0 auto; }

.content-panel {
  display: none;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: center;
}

.content-panel.active {
  display: grid;
  animation: fadeIn 0.4s ease;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

.content-panel-text h3 {
  font-size: 1.8rem;
  font-weight: 800;
  margin-bottom: 16px;
}

.content-panel-text p {
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 24px;
}

.content-features {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.content-features li {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.9rem;
  font-weight: 500;
}

.content-features li::before {
  content: '';
  width: 20px; height: 20px;
  border-radius: 50%;
  background: var(--primary-bg);
  flex-shrink: 0;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 20 20' xmlns='http://www.w3.org/2000/svg' fill='%23FF6B6B'%3E%3Cpath fill-rule='evenodd' d='M16.707 5.293a1 1 0 010 1.414l-8 8a1 1 0 01-1.414 0l-4-4a1 1 0 011.414-1.414L8 12.586l7.293-7.293a1 1 0 011.414 0z'/%3E%3C/svg%3E");
  background-size: 12px;
  background-repeat: no-repeat;
  background-position: center;
}

.content-panel-visual {
  display: flex;
  justify-content: center;
}

/* 内容 Mockup */
.content-mockup {
  width: 260px;
  background: var(--bg-dark);
  border-radius: 24px;
  padding: 12px;
  box-shadow: var(--shadow-lg);
}

.mockup-post {
  background: #fff;
  border-radius: 16px;
  padding: 16px;
}

.mockup-post-header {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 12px;
}

.mockup-avatar {
  width: 32px; height: 32px;
  border-radius: 50%;
  flex-shrink: 0;
}

.mockup-user-info { display: flex; flex-direction: column; }
.mockup-username { font-size: 0.85rem; font-weight: 700; }
.mockup-user-meta { font-size: 0.7rem; color: var(--text-light); }

.mockup-post-text {
  font-size: 0.8rem;
  line-height: 1.5;
  margin-bottom: 12px;
}

.mockup-post-images {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 4px;
  margin-bottom: 12px;
}

.mockup-img {
  height: 60px;
  background: linear-gradient(135deg, #FFECD2, #FCB69F);
  border-radius: 6px;
}

.mockup-post-actions {
  display: flex;
  gap: 16px;
  font-size: 0.75rem;
  color: var(--text-secondary);
}

/* Video mockup */
.video-mockup .mockup-video-player {
  background: linear-gradient(135deg, #2C3E50, #3498DB);
  border-radius: 16px;
  height: 360px;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  padding: 20px;
  position: relative;
}

.mockup-play-btn {
  position: absolute;
  top: 50%; left: 50%;
  transform: translate(-50%, -50%);
  width: 48px; height: 48px;
  background: rgba(255,255,255,0.2);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-size: 1.2rem;
}

.mockup-video-info { color: #fff; }
.mockup-video-user { font-size: 0.85rem; font-weight: 700; margin-bottom: 4px; }
.mockup-video-desc { font-size: 0.75rem; margin-bottom: 4px; }
.mockup-video-music { font-size: 0.7rem; opacity: 0.7; }

/* Live mockup */
.live-mockup .mockup-live-screen {
  background: linear-gradient(135deg, #6C5CE7, #A29BFE);
  border-radius: 16px;
  height: 360px;
  padding: 20px;
  position: relative;
}

.live-badge {
  position: absolute;
  top: 16px; left: 16px;
  background: #E74C3C;
  color: #fff;
  padding: 4px 12px;
  border-radius: 50px;
  font-size: 0.75rem;
  font-weight: 700;
}

.live-viewers {
  position: absolute;
  top: 16px; right: 16px;
  color: #fff;
  font-size: 0.8rem;
}

.live-comments {
  position: absolute;
  bottom: 20px; left: 16px; right: 16px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.live-comment {
  display: inline-block;
  background: rgba(0,0,0,0.3);
  color: #fff;
  padding: 4px 10px;
  border-radius: 50px;
  font-size: 0.75rem;
  width: fit-content;
}

/* Podcast mockup */
.podcast-mockup .mockup-podcast-player {
  background: #fff;
  border-radius: 16px;
  padding: 24px;
  text-align: center;
}

.podcast-cover {
  width: 120px; height: 120px;
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  border-radius: 16px;
  margin: 0 auto 16px;
}

.podcast-title { font-size: 0.95rem; font-weight: 700; margin-bottom: 4px; }
.podcast-host { font-size: 0.8rem; color: var(--text-secondary); margin-bottom: 16px; }

.podcast-progress {
  height: 4px;
  background: var(--border);
  border-radius: 2px;
  margin-bottom: 16px;
  overflow: hidden;
}

.podcast-progress-bar {
  width: 35%;
  height: 100%;
  background: var(--primary);
  border-radius: 2px;
}

.podcast-controls {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 24px;
  font-size: 1.2rem;
  color: var(--text-secondary);
}

.podcast-play {
  width: 40px; height: 40px;
  background: var(--primary);
  color: #fff;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
}

/* Novel mockup */
.novel-mockup .mockup-novel-player {
  background: #fff;
  border-radius: 16px;
  padding: 24px;
  text-align: center;
}

.novel-cover {
  width: 120px; height: 160px;
  background: linear-gradient(135deg, #6C5CE7, #A29BFE);
  border-radius: 12px;
  margin: 0 auto 16px;
}

.novel-title { font-size: 0.95rem; font-weight: 700; margin-bottom: 4px; }
.novel-author { font-size: 0.8rem; color: var(--text-secondary); margin-bottom: 16px; }

.novel-progress {
  height: 4px;
  background: var(--border);
  border-radius: 2px;
  margin-bottom: 12px;
  overflow: hidden;
}

.novel-progress-bar {
  width: 45%;
  height: 100%;
  background: linear-gradient(90deg, #6C5CE7, #A29BFE);
  border-radius: 2px;
}

.novel-meta {
  display: flex;
  justify-content: space-between;
  font-size: 0.75rem;
  color: var(--text-light);
}

/* Store mockup */
.store-mockup .mockup-store {
  background: #fff;
  border-radius: 16px;
  padding: 20px;
}

.store-header {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 16px;
}

.store-app-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.store-app-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px;
  border-radius: 12px;
  background: var(--bg-alt);
}

.store-app-icon {
  width: 44px; height: 44px;
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  flex-shrink: 0;
}

.store-app-info {
  flex: 1;
}

.store-app-name {
  font-size: 0.85rem;
  font-weight: 600;
}

.store-app-desc {
  font-size: 0.7rem;
  color: var(--text-light);
}

.store-app-btn {
  background: var(--primary-bg);
  color: var(--primary);
  padding: 4px 14px;
  border-radius: 50px;
  font-size: 0.75rem;
  font-weight: 600;
  flex-shrink: 0;
}

/* ========== 安全隐私 ========== */
.safety {
  padding: 100px 0;
  background: var(--bg-alt);
}

.safety-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-bottom: 40px;
}

.safety-card {
  padding: 32px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  transition: var(--transition);
}

.safety-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.safety-icon { font-size: 2rem; margin-bottom: 16px; }

.safety-card h3 {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 8px;
}

.safety-card p {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

.safety-badges {
  display: flex;
  justify-content: center;
  gap: 32px;
  flex-wrap: wrap;
}

.badge-item {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 12px 20px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 50px;
  font-size: 0.85rem;
  font-weight: 600;
}

.badge-icon { font-size: 1.2rem; }

/* ========== 用户故事 ========== */
.stories { padding: 100px 0; }

.stories-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.story-card {
  padding: 32px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  transition: var(--transition);
  position: relative;
}

.story-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.story-quote {
  font-size: 3rem;
  font-weight: 900;
  color: var(--primary);
  opacity: 0.2;
  line-height: 1;
  margin-bottom: -10px;
}

.story-card > p {
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 20px;
}

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

.story-avatar {
  width: 40px; height: 40px;
  border-radius: 50%;
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.85rem;
  font-weight: 700;
}

.story-name { font-size: 0.9rem; font-weight: 700; }
.story-role { font-size: 0.8rem; color: var(--text-light); }

/* ========== 定价 ========== */
.pricing {
  padding: 100px 0;
  background: var(--bg-alt);
}

.pricing-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  margin-bottom: 48px;
}

.toggle-label {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-secondary);
  transition: var(--transition);
}

.toggle-label.active { color: var(--text); font-weight: 700; }

.toggle-switch {
  width: 48px; height: 26px;
  background: var(--border);
  border-radius: 13px;
  cursor: pointer;
  position: relative;
  transition: var(--transition);
}

.toggle-switch.active { background: var(--primary); }

.toggle-knob {
  position: absolute;
  top: 3px; left: 3px;
  width: 20px; height: 20px;
  background: #fff;
  border-radius: 50%;
  transition: var(--transition);
  box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.toggle-switch.active .toggle-knob { left: 25px; }

.save-badge {
  background: var(--success);
  color: #fff;
  padding: 2px 8px;
  border-radius: 50px;
  font-size: 0.7rem;
  font-weight: 700;
}

.pricing-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
  max-width: 720px;
  margin: 0 auto;
  justify-content: center;
}

.pricing-card {
  padding: 36px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  transition: var(--transition);
  position: relative;
}

.pricing-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.pricing-card.popular {
  border-color: var(--primary);
  box-shadow: 0 8px 40px rgba(255,107,107,0.15);
}

.popular-badge {
  position: absolute;
  top: -12px; left: 50%;
  transform: translateX(-50%);
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  color: #fff;
  padding: 4px 20px;
  border-radius: 50px;
  font-size: 0.8rem;
  font-weight: 700;
}

.pricing-header { margin-bottom: 20px; }

.pricing-header h3 {
  font-size: 1.3rem;
  font-weight: 800;
  margin-bottom: 4px;
}

.pricing-header p { font-size: 0.9rem; color: var(--text-secondary); }

.pricing-price {
  display: flex;
  align-items: baseline;
  gap: 4px;
  margin-bottom: 24px;
}

.price-amount {
  font-size: 2.5rem;
  font-weight: 900;
  color: var(--text);
}

.price-period {
  font-size: 0.9rem;
  color: var(--text-secondary);
}

.pricing-features {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-bottom: 28px;
}

.pricing-features li {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.88rem;
}

.pricing-features li.disabled {
  color: var(--text-light);
  text-decoration: line-through;
}

.pricing-note {
  text-align: center;
  margin-top: 32px;
  font-size: 0.85rem;
  color: var(--text-secondary);
}

/* ========== 更新日志 ========== */
.changelog { padding: 100px 0; }

.timeline {
  max-width: 700px;
  margin: 0 auto;
  position: relative;
  padding-left: 40px;
}

.timeline::before {
  content: '';
  position: absolute;
  left: 15px; top: 0; bottom: 0;
  width: 2px;
  background: var(--border);
}

.timeline-item {
  position: relative;
  margin-bottom: 40px;
}

.timeline-item:last-child { margin-bottom: 0; }

.timeline-dot {
  position: absolute;
  left: -33px; top: 4px;
  width: 12px; height: 12px;
  border-radius: 50%;
  background: var(--border);
  border: 2px solid #fff;
}

.timeline-dot.latest {
  background: var(--primary);
  box-shadow: 0 0 0 4px rgba(255,107,107,0.2);
}

.timeline-content {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
}

.timeline-header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 12px;
  flex-wrap: wrap;
}

.timeline-version {
  font-size: 0.9rem;
  font-weight: 800;
  color: var(--primary);
}

.timeline-date {
  font-size: 0.85rem;
  color: var(--text-light);
}

.timeline-badge {
  padding: 2px 10px;
  border-radius: 50px;
  font-size: 0.7rem;
  font-weight: 700;
}

.timeline-badge.new {
  background: var(--primary);
  color: #fff;
}

.timeline-content h3 {
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: 8px;
}

.timeline-content > p {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 16px;
}

.timeline-changes {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.timeline-changes li {
  font-size: 0.85rem;
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

.change-tag {
  padding: 2px 8px;
  border-radius: 4px;
  font-size: 0.7rem;
  font-weight: 700;
  flex-shrink: 0;
}

.change-tag.feature { background: rgba(0,184,148,0.1); color: #00B894; }
.change-tag.improve { background: rgba(116,185,255,0.1); color: #0984E3; }
.change-tag.fix { background: rgba(253,203,110,0.1); color: #F39C12; }

/* ========== FAQ ========== */
.faq {
  padding: 100px 0;
  background: var(--bg-alt);
}

.faq-list {
  max-width: 700px;
  margin: 0 auto;
}

.faq-item {
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  margin-bottom: 12px;
  background: var(--bg);
  overflow: hidden;
  transition: var(--transition);
}

.faq-question {
  width: 100%;
  padding: 20px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: none;
  border: none;
  cursor: pointer;
  font-size: 1rem;
  font-weight: 600;
  color: var(--text);
  text-align: left;
  font-family: inherit;
  transition: var(--transition);
}

.faq-question:hover { color: var(--primary); }

.faq-icon {
  flex-shrink: 0;
  transition: var(--transition);
}

.faq-item.active .faq-icon {
  transform: rotate(45deg);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease, padding 0.3s ease;
}

.faq-item.active .faq-answer {
  max-height: 300px;
  padding: 0 24px 20px;
}

.faq-answer p {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.7;
}

/* ========== 下载区域 ========== */
.download {
  padding: 100px 0;
  background: linear-gradient(135deg, #1A1A2E, #2D1B3D);
  color: #fff;
  position: relative;
  overflow: hidden;
}

.download-bg-shapes {
  position: absolute;
  inset: 0;
  pointer-events: none;
}

.dl-shape {
  position: absolute;
  border-radius: 50%;
}

.dl-shape-1 {
  top: -100px; right: -100px;
  width: 400px; height: 400px;
  background: radial-gradient(circle, rgba(255,107,107,0.15) 0%, transparent 70%);
}

.dl-shape-2 {
  bottom: -100px; left: -100px;
  width: 300px; height: 300px;
  background: radial-gradient(circle, rgba(78,205,196,0.1) 0%, transparent 70%);
}

.download-content {
  text-align: center;
  position: relative;
  z-index: 1;
}

.download-content .section-tag {
  background: rgba(255,255,255,0.1);
  color: #fff;
}

.download-content h2 {
  font-size: 2.5rem;
  font-weight: 800;
  margin-bottom: 16px;
}

.download-content p {
  color: rgba(255,255,255,0.7);
  font-size: 1.1rem;
  margin-bottom: 36px;
}

.download-buttons {
  display: flex;
  justify-content: center;
  gap: 16px;
  margin-bottom: 24px;
}

.download-btn {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 28px;
  background: rgba(255,255,255,0.1);
  border: 1px solid rgba(255,255,255,0.2);
  border-radius: 14px;
  color: #fff;
  transition: var(--transition);
}

.download-btn:hover {
  background: rgba(255,255,255,0.2);
  transform: translateY(-2px);
}

.download-btn small {
  font-size: 0.7rem;
  opacity: 0.7;
  display: block;
}

.download-btn span {
  font-size: 1.1rem;
  font-weight: 700;
}

.download-platforms {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-size: 0.85rem;
  color: rgba(255,255,255,0.5);
}

.platform-tag {
  padding: 4px 12px;
  background: rgba(255,255,255,0.08);
  border-radius: 50px;
  font-size: 0.8rem;
}

/* ========== Newsletter ========== */
.newsletter { padding: 80px 0; }

.newsletter-card {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 40px;
  padding: 48px;
  background: var(--bg-alt);
  border-radius: 24px;
  border: 1px solid var(--border);
}

.newsletter-text h3 {
  font-size: 1.5rem;
  font-weight: 800;
  margin-bottom: 8px;
}

.newsletter-text p {
  color: var(--text-secondary);
  font-size: 0.95rem;
}

.newsletter-form {
  display: flex;
  gap: 12px;
  flex-shrink: 0;
}

.newsletter-form input {
  padding: 14px 20px;
  border: 1px solid var(--border);
  border-radius: 50px;
  font-size: 0.95rem;
  min-width: 260px;
  outline: none;
  transition: var(--transition);
  font-family: inherit;
}

.newsletter-form input:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(255,107,107,0.1);
}

/* ========== 页脚 ========== */
.footer {
  padding: 64px 0 32px;
  background: var(--bg-dark);
  color: rgba(255,255,255,0.7);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 48px;
  margin-bottom: 48px;
}

.footer-brand .logo {
  margin-bottom: 16px;
  display: inline-flex;
}

.footer-brand p {
  font-size: 0.9rem;
  line-height: 1.7;
  margin-bottom: 20px;
}

.footer-social {
  display: flex;
  gap: 12px;
}

.social-link {
  width: 36px; height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(255,255,255,0.08);
  border-radius: 50%;
  transition: var(--transition);
}

.social-link:hover {
  background: var(--primary);
  color: #fff;
}

.footer-links h4 {
  color: #fff;
  font-size: 0.95rem;
  font-weight: 700;
  margin-bottom: 16px;
}

.footer-links a {
  display: block;
  font-size: 0.88rem;
  margin-bottom: 10px;
  transition: var(--transition);
}

.footer-links a:hover { color: var(--primary); }

.footer-bottom {
  padding-top: 24px;
  border-top: 1px solid rgba(255,255,255,0.08);
  text-align: center;
  font-size: 0.85rem;
}

.footer-bottom a {
  transition: var(--transition);
}

.footer-bottom a:hover { color: var(--primary); }

/* ========== 回到顶部 ========== */
.back-to-top {
  position: fixed;
  bottom: 32px; right: 32px;
  width: 48px; height: 48px;
  background: var(--primary);
  color: #fff;
  border: none;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  box-shadow: 0 4px 16px rgba(255,107,107,0.3);
  opacity: 0;
  transform: translateY(20px);
  transition: var(--transition);
  z-index: 999;
}

.back-to-top.visible {
  opacity: 1;
  transform: translateY(0);
}

.back-to-top:hover {
  transform: translateY(-4px);
}

/* ========== 滚动动画 ========== */
.feature-card,
.safety-card,
.story-card,
.category-card,
.pricing-card,
.faq-item,
.timeline-item {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s ease, transform 0.6s ease, box-shadow var(--transition), border-color var(--transition);
}

.feature-card.animate,
.safety-card.animate,
.story-card.animate,
.category-card.animate,
.pricing-card.animate,
.faq-item.animate,
.timeline-item.animate {
  opacity: 1;
  transform: translateY(0);
}

.animate:nth-child(2) { transition-delay: 0.05s; }
.animate:nth-child(3) { transition-delay: 0.1s; }
.animate:nth-child(4) { transition-delay: 0.15s; }
.animate:nth-child(5) { transition-delay: 0.2s; }
.animate:nth-child(6) { transition-delay: 0.25s; }

/* ========== 响应式 ========== */
@media (max-width: 1024px) {
  .hero-container { grid-template-columns: 1fr; text-align: center; }
  .hero-text p { margin: 0 auto 32px; }
  .hero-buttons { justify-content: center; }
  .hero-trust { justify-content: center; }
  .hero-stats { justify-content: center; }
  .hero-image { margin-top: 40px; }
  .features-grid { grid-template-columns: repeat(2, 1fr); }
  .feature-highlight-content { grid-template-columns: 1fr; }
  .community-categories { grid-template-columns: repeat(3, 1fr); }
  .safety-grid { grid-template-columns: repeat(2, 1fr); }
  .stories-grid { grid-template-columns: repeat(2, 1fr); }
  .pricing-grid { grid-template-columns: repeat(2, 1fr); max-width: 600px; }
  .content-panel { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: repeat(2, 1fr); }
  .newsletter-card { flex-direction: column; text-align: center; }
}

@media (max-width: 768px) {
  .nav-links { display: none; }
  .nav-actions { display: none; }
  .nav-toggle { display: flex; }

  .nav-links.active {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 100%; left: 0; right: 0;
    background: #fff;
    padding: 20px;
    box-shadow: var(--shadow-lg);
    gap: 16px;
  }

  .hero-text h1 { font-size: 2.2rem; }
  .hero-stats { flex-wrap: wrap; gap: 16px; }
  .stat-divider { display: none; }
  .section-header h2 { font-size: 1.8rem; }
  .features-grid { grid-template-columns: 1fr; }
  .community-categories { grid-template-columns: repeat(2, 1fr); }
  .safety-grid { grid-template-columns: 1fr; }
  .stories-grid { grid-template-columns: 1fr; }
  .pricing-grid { grid-template-columns: 1fr; max-width: 400px; }
  .footer-grid { grid-template-columns: 1fr; }
  .download-buttons { flex-direction: column; align-items: center; }
  .newsletter-form { flex-direction: column; width: 100%; }
  .newsletter-form input { min-width: auto; }
  .phone-mockup { width: 240px; height: 500px; }
  .floating-card-3 { display: none; }
}

@media (max-width: 480px) {
  .hero-text h1 { font-size: 1.8rem; }
  .hero-buttons { flex-direction: column; }
  .btn-lg { padding: 14px 28px; }
  .community-categories { grid-template-columns: 1fr 1fr; }
  .content-tabs { gap: 4px; }
  .content-tab-btn { padding: 8px 16px; font-size: 0.82rem; }
}