/* ============================================
   17C视频社区 - 主样式表
   Modern Minimal High-end Style
   ============================================ */

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

:root {
  --color-bg: #fafafa;
  --color-white: #ffffff;
  --color-black: #0a0a0a;
  --color-primary: #1a1a2e;
  --color-accent: #e63946;
  --color-accent-light: #ff6b6b;
  --color-text: #2d2d2d;
  --color-text-muted: #888888;
  --color-text-light: #b0b0b0;
  --color-border: #e8e8e8;
  --color-border-light: #f0f0f0;
  --color-card-bg: #ffffff;
  --color-nav-bg: rgba(255,255,255,0.96);
  --color-section-alt: #f5f5f7;
  --color-gradient-start: #1a1a2e;
  --color-gradient-end: #16213e;
  --font-sans: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-display: 'PingFang SC', 'Microsoft YaHei', Georgia, serif;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.06), 0 1px 2px rgba(0,0,0,0.04);
  --shadow-md: 0 4px 16px rgba(0,0,0,0.08), 0 2px 6px rgba(0,0,0,0.04);
  --shadow-lg: 0 12px 40px rgba(0,0,0,0.12), 0 4px 12px rgba(0,0,0,0.06);
  --shadow-hover: 0 20px 60px rgba(0,0,0,0.15);
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-xl: 28px;
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-fast: 0.18s cubic-bezier(0.4, 0, 0.2, 1);
  --max-width: 1200px;
  --nav-height: 68px;
}

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

body {
  font-family: var(--font-sans);
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

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

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

ul, ol {
  list-style: none;
}

button {
  cursor: pointer;
  border: none;
  background: none;
  font-family: var(--font-sans);
}

input, textarea {
  font-family: var(--font-sans);
}

/* ---------- Layout Utilities ---------- */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

.section {
  padding: 80px 0;
}

.section-alt {
  background: var(--color-section-alt);
}

.section-dark {
  background: var(--color-primary);
  color: var(--color-white);
}

.text-center { text-align: center; }
.text-left   { text-align: left; }

/* ---------- Typography ---------- */
.section-label {
  display: inline-block;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: 12px;
}

.section-title {
  font-size: clamp(1.6rem, 3vw, 2.4rem);
  font-weight: 700;
  color: var(--color-primary);
  line-height: 1.25;
  letter-spacing: -0.02em;
  margin-bottom: 16px;
}

.section-subtitle {
  font-size: 1rem;
  color: var(--color-text-muted);
  max-width: 560px;
  line-height: 1.75;
}

.section-header {
  margin-bottom: 52px;
}

/* ---------- Navigation ---------- */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  height: var(--nav-height);
  background: var(--color-nav-bg);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--color-border-light);
  transition: box-shadow var(--transition);
}

.nav.scrolled {
  box-shadow: var(--shadow-sm);
}

.nav-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

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

.nav-logo-mark {
  width: 36px;
  height: 36px;
  background: linear-gradient(135deg, var(--color-accent), #c62828);
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 15px;
  font-weight: 800;
  color: #fff;
  letter-spacing: -0.03em;
}

.nav-logo-text {
  font-size: 18px;
  font-weight: 700;
  color: var(--color-primary);
  letter-spacing: -0.02em;
}

.nav-logo-text span {
  color: var(--color-accent);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 4px;
  flex: 1;
  justify-content: center;
}

.nav-links a {
  padding: 6px 14px;
  font-size: 14px;
  font-weight: 500;
  color: var(--color-text-muted);
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
  white-space: nowrap;
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--color-primary);
  background: var(--color-border-light);
}

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

.btn-nav-login {
  padding: 7px 18px;
  font-size: 13px;
  font-weight: 500;
  color: var(--color-text-muted);
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
}

.btn-nav-login:hover {
  color: var(--color-primary);
  background: var(--color-border-light);
}

.btn-nav-join {
  padding: 7px 18px;
  font-size: 13px;
  font-weight: 600;
  color: #fff;
  background: var(--color-accent);
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
}

.btn-nav-join:hover {
  background: #c62828;
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(230,57,70,0.35);
}

.nav-mobile-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 8px;
  cursor: pointer;
}

.nav-mobile-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--color-text);
  border-radius: 2px;
  transition: all var(--transition-fast);
}

/* ---------- Search Bar ---------- */
.search-bar-wrapper {
  background: var(--color-white);
  border-bottom: 1px solid var(--color-border-light);
  padding: 12px 0;
  margin-top: var(--nav-height);
}

.search-bar-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  gap: 12px;
}

.search-form {
  flex: 1;
  display: flex;
  align-items: center;
  background: var(--color-section-alt);
  border: 1.5px solid var(--color-border);
  border-radius: 50px;
  padding: 0 16px;
  gap: 10px;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
  max-width: 600px;
}

.search-form:focus-within {
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px rgba(230,57,70,0.08);
}

.search-icon {
  color: var(--color-text-muted);
  font-size: 15px;
  flex-shrink: 0;
}

.search-input {
  flex: 1;
  border: none;
  background: transparent;
  padding: 9px 0;
  font-size: 14px;
  color: var(--color-text);
  outline: none;
}

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

.search-btn {
  padding: 6px 18px;
  background: var(--color-accent);
  color: #fff;
  border-radius: 50px;
  font-size: 13px;
  font-weight: 600;
  transition: all var(--transition-fast);
  flex-shrink: 0;
}

.search-btn:hover {
  background: #c62828;
}

.search-hot-tags {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 12px;
  color: var(--color-text-muted);
  flex-wrap: wrap;
}

.search-hot-tags span {
  font-weight: 600;
  color: var(--color-text-light);
}

.hot-tag {
  padding: 3px 10px;
  background: var(--color-border-light);
  border-radius: 50px;
  color: var(--color-text-muted);
  font-size: 12px;
  transition: all var(--transition-fast);
  cursor: pointer;
}

.hot-tag:hover {
  background: var(--color-accent);
  color: #fff;
}

/* ---------- Hero Banner ---------- */
.hero {
  position: relative;
  min-height: 580px;
  display: flex;
  align-items: center;
  overflow: hidden;
  background: linear-gradient(135deg, var(--color-gradient-start) 0%, var(--color-gradient-end) 60%, #0f3460 100%);
}

.hero-bg {
  position: absolute;
  inset: 0;
  overflow: hidden;
}

.hero-bg-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.18;
  transform: scale(1.05);
}

.hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(26,26,46,0.92) 0%, rgba(22,33,62,0.85) 60%, rgba(15,52,96,0.7) 100%);
}

.hero-content {
  position: relative;
  z-index: 2;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 80px 24px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 5px 14px;
  background: rgba(230,57,70,0.2);
  border: 1px solid rgba(230,57,70,0.4);
  border-radius: 50px;
  font-size: 12px;
  font-weight: 600;
  color: #ff8a8a;
  letter-spacing: 0.05em;
  margin-bottom: 24px;
}

.hero-badge-dot {
  width: 6px;
  height: 6px;
  background: var(--color-accent-light);
  border-radius: 50%;
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.5; transform: scale(1.4); }
}

.hero-title {
  font-size: clamp(2rem, 4.5vw, 3.4rem);
  font-weight: 800;
  color: #fff;
  line-height: 1.15;
  letter-spacing: -0.03em;
  margin-bottom: 20px;
}

.hero-title .accent {
  color: var(--color-accent-light);
}

.hero-desc {
  font-size: 1.05rem;
  color: rgba(255,255,255,0.72);
  line-height: 1.8;
  margin-bottom: 36px;
  max-width: 480px;
}

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

.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 13px 28px;
  background: var(--color-accent);
  color: #fff;
  border-radius: var(--radius-md);
  font-size: 15px;
  font-weight: 600;
  transition: all var(--transition);
  box-shadow: 0 4px 20px rgba(230,57,70,0.4);
}

.btn-primary:hover {
  background: #c62828;
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(230,57,70,0.5);
}

.btn-outline {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 13px 28px;
  background: transparent;
  color: rgba(255,255,255,0.85);
  border: 1.5px solid rgba(255,255,255,0.3);
  border-radius: var(--radius-md);
  font-size: 15px;
  font-weight: 500;
  transition: all var(--transition);
}

.btn-outline:hover {
  background: rgba(255,255,255,0.1);
  border-color: rgba(255,255,255,0.6);
  color: #fff;
}

.hero-stats {
  display: flex;
  gap: 32px;
  margin-top: 44px;
  padding-top: 32px;
  border-top: 1px solid rgba(255,255,255,0.12);
}

.hero-stat-item {
  text-align: left;
}

.hero-stat-num {
  font-size: 1.7rem;
  font-weight: 800;
  color: #fff;
  letter-spacing: -0.03em;
  line-height: 1;
}

.hero-stat-num span {
  color: var(--color-accent-light);
}

.hero-stat-label {
  font-size: 12px;
  color: rgba(255,255,255,0.5);
  margin-top: 4px;
  letter-spacing: 0.04em;
}

.hero-visual {
  position: relative;
}

.hero-video-preview {
  border-radius: var(--radius-xl);
  overflow: hidden;
  box-shadow: var(--shadow-hover);
  position: relative;
  aspect-ratio: 16/9;
}

.hero-video-preview img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.hero-play-btn {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 64px;
  height: 64px;
  background: rgba(255,255,255,0.95);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 8px 32px rgba(0,0,0,0.3);
  transition: all var(--transition);
  cursor: pointer;
}

.hero-play-btn:hover {
  transform: translate(-50%, -50%) scale(1.1);
  box-shadow: 0 12px 40px rgba(0,0,0,0.4);
}

.hero-play-btn svg {
  width: 22px;
  height: 22px;
  fill: var(--color-accent);
  margin-left: 3px;
}

.hero-floating-cards {
  position: absolute;
  bottom: -20px;
  left: -20px;
  right: -20px;
  display: flex;
  gap: 10px;
  justify-content: flex-start;
}

.hero-mini-card {
  background: rgba(255,255,255,0.95);
  border-radius: var(--radius-md);
  padding: 10px 14px;
  display: flex;
  align-items: center;
  gap: 8px;
  box-shadow: var(--shadow-md);
  font-size: 12px;
  backdrop-filter: blur(10px);
  animation: floatUp 3s ease-in-out infinite;
}

.hero-mini-card:nth-child(2) { animation-delay: 1s; }
.hero-mini-card:nth-child(3) { animation-delay: 2s; }

@keyframes floatUp {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-6px); }
}

.hero-mini-card-icon {
  width: 28px;
  height: 28px;
  border-radius: 8px;
  background: linear-gradient(135deg, var(--color-accent), #c62828);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-size: 13px;
  flex-shrink: 0;
}

.hero-mini-card-text strong {
  display: block;
  font-size: 12px;
  font-weight: 700;
  color: var(--color-primary);
  line-height: 1.2;
}

.hero-mini-card-text span {
  font-size: 11px;
  color: var(--color-text-muted);
}

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

.video-card {
  background: var(--color-card-bg);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: all var(--transition);
  cursor: pointer;
  border: 1px solid var(--color-border-light);
}

.video-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-hover);
  border-color: transparent;
}

.video-thumb {
  position: relative;
  aspect-ratio: 16/9;
  overflow: hidden;
  background: var(--color-border-light);
}

.video-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition);
}

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

.video-play-overlay {
  position: absolute;
  inset: 0;
  background: rgba(0,0,0,0);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background var(--transition);
}

.video-card:hover .video-play-overlay {
  background: rgba(0,0,0,0.35);
}

.video-play-btn {
  width: 52px;
  height: 52px;
  background: rgba(255,255,255,0.95);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transform: scale(0.7);
  transition: all var(--transition);
  box-shadow: 0 4px 20px rgba(0,0,0,0.3);
}

.video-play-btn svg {
  width: 18px;
  height: 18px;
  fill: var(--color-accent);
  margin-left: 3px;
}

.video-card:hover .video-play-btn {
  opacity: 1;
  transform: scale(1);
}

.video-duration {
  position: absolute;
  bottom: 8px;
  right: 10px;
  background: rgba(0,0,0,0.72);
  color: #fff;
  font-size: 11px;
  font-weight: 600;
  padding: 2px 7px;
  border-radius: 4px;
  letter-spacing: 0.04em;
}

.video-tag {
  position: absolute;
  top: 10px;
  left: 10px;
  background: var(--color-accent);
  color: #fff;
  font-size: 10px;
  font-weight: 700;
  padding: 3px 8px;
  border-radius: 4px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.video-info {
  padding: 16px;
}

.video-title {
  font-size: 14px;
  font-weight: 600;
  color: var(--color-text);
  line-height: 1.5;
  margin-bottom: 10px;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.video-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 12px;
  color: var(--color-text-muted);
}

.video-author {
  display: flex;
  align-items: center;
  gap: 6px;
}

.video-author-avatar {
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: var(--color-border);
  overflow: hidden;
  flex-shrink: 0;
}

.video-author-avatar img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.video-stats {
  display: flex;
  gap: 10px;
  font-size: 11px;
  color: var(--color-text-light);
}

.video-stats span {
  display: flex;
  align-items: center;
  gap: 3px;
}

/* ---------- Category Sections ---------- */
.category-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
  gap: 16px;
}

.category-card {
  background: var(--color-card-bg);
  border: 1.5px solid var(--color-border-light);
  border-radius: var(--radius-lg);
  padding: 24px 16px;
  text-align: center;
  transition: all var(--transition);
  cursor: pointer;
}

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

.category-icon {
  width: 52px;
  height: 52px;
  border-radius: var(--radius-md);
  margin: 0 auto 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 22px;
}

.category-name {
  font-size: 14px;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 4px;
}

.category-count {
  font-size: 12px;
  color: var(--color-text-muted);
}

/* ---------- Stats Section ---------- */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 2px;
  background: var(--color-border-light);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.stat-item {
  background: var(--color-white);
  padding: 40px 24px;
  text-align: center;
}

.stat-num {
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 800;
  color: var(--color-primary);
  letter-spacing: -0.04em;
  line-height: 1;
  margin-bottom: 8px;
}

.stat-num .accent {
  color: var(--color-accent);
}

.stat-label {
  font-size: 13px;
  color: var(--color-text-muted);
  letter-spacing: 0.04em;
}

/* ---------- Testimonials ---------- */
.testimonials-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 24px;
}

.testimonial-card {
  background: var(--color-card-bg);
  border-radius: var(--radius-lg);
  padding: 28px;
  border: 1px solid var(--color-border-light);
  transition: all var(--transition);
}

.testimonial-card:hover {
  box-shadow: var(--shadow-md);
  border-color: transparent;
  transform: translateY(-3px);
}

.testimonial-stars {
  display: flex;
  gap: 3px;
  margin-bottom: 14px;
}

.testimonial-stars span {
  color: #f59e0b;
  font-size: 14px;
}

.testimonial-text {
  font-size: 14px;
  color: var(--color-text);
  line-height: 1.75;
  margin-bottom: 20px;
}

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

.testimonial-avatar {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  overflow: hidden;
  background: var(--color-border);
  flex-shrink: 0;
}

.testimonial-avatar img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.testimonial-name {
  font-size: 14px;
  font-weight: 600;
  color: var(--color-primary);
}

.testimonial-role {
  font-size: 12px;
  color: var(--color-text-muted);
  margin-top: 2px;
}

/* ---------- FAQ ---------- */
.faq-list {
  max-width: 760px;
  margin: 0 auto;
}

.faq-item {
  border-bottom: 1px solid var(--color-border-light);
}

.faq-item:first-child {
  border-top: 1px solid var(--color-border-light);
}

.faq-question {
  width: 100%;
  text-align: left;
  padding: 20px 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  font-size: 15px;
  font-weight: 600;
  color: var(--color-primary);
  cursor: pointer;
  transition: color var(--transition-fast);
  background: none;
  border: none;
}

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

.faq-icon {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  border: 1.5px solid var(--color-border);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  transition: all var(--transition-fast);
  font-size: 16px;
  line-height: 1;
  color: var(--color-text-muted);
}

.faq-item.open .faq-icon {
  background: var(--color-accent);
  border-color: var(--color-accent);
  color: #fff;
  transform: rotate(45deg);
}

.faq-answer {
  display: none;
  padding-bottom: 20px;
  font-size: 14px;
  color: var(--color-text-muted);
  line-height: 1.8;
}

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

/* ---------- Join / CTA Section ---------- */
.cta-section {
  background: linear-gradient(135deg, var(--color-primary) 0%, #0f3460 100%);
  padding: 80px 0;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.cta-section::before {
  content: '';
  position: absolute;
  top: -50%;
  left: -10%;
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, rgba(230,57,70,0.15) 0%, transparent 70%);
  pointer-events: none;
}

.cta-title {
  font-size: clamp(1.6rem, 3.5vw, 2.6rem);
  font-weight: 800;
  color: #fff;
  letter-spacing: -0.03em;
  margin-bottom: 16px;
}

.cta-desc {
  font-size: 1rem;
  color: rgba(255,255,255,0.65);
  max-width: 500px;
  margin: 0 auto 36px;
  line-height: 1.75;
}

.cta-form {
  display: flex;
  gap: 12px;
  max-width: 460px;
  margin: 0 auto;
  flex-wrap: wrap;
  justify-content: center;
}

.cta-input {
  flex: 1;
  min-width: 200px;
  padding: 13px 20px;
  background: rgba(255,255,255,0.1);
  border: 1.5px solid rgba(255,255,255,0.2);
  border-radius: var(--radius-md);
  color: #fff;
  font-size: 14px;
  outline: none;
  transition: border-color var(--transition-fast);
}

.cta-input::placeholder {
  color: rgba(255,255,255,0.45);
}

.cta-input:focus {
  border-color: rgba(255,255,255,0.5);
}

.btn-cta {
  padding: 13px 28px;
  background: var(--color-accent);
  color: #fff;
  border-radius: var(--radius-md);
  font-size: 15px;
  font-weight: 600;
  transition: all var(--transition);
  white-space: nowrap;
}

.btn-cta:hover {
  background: #c62828;
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(230,57,70,0.5);
}

.cta-social {
  margin-top: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
}

.cta-social-label {
  font-size: 13px;
  color: rgba(255,255,255,0.45);
}

.social-link {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 7px 14px;
  background: rgba(255,255,255,0.08);
  border: 1px solid rgba(255,255,255,0.15);
  border-radius: 50px;
  font-size: 12px;
  color: rgba(255,255,255,0.7);
  transition: all var(--transition-fast);
}

.social-link:hover {
  background: rgba(255,255,255,0.15);
  color: #fff;
}

/* ---------- Footer ---------- */
.footer {
  background: #0a0a0a;
  color: rgba(255,255,255,0.6);
  padding: 60px 0 0;
}

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

.footer-brand-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 16px;
}

.footer-logo-mark {
  width: 36px;
  height: 36px;
  background: linear-gradient(135deg, var(--color-accent), #c62828);
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 15px;
  font-weight: 800;
  color: #fff;
}

.footer-logo-text {
  font-size: 18px;
  font-weight: 700;
  color: #fff;
}

.footer-desc {
  font-size: 13px;
  line-height: 1.8;
  color: rgba(255,255,255,0.45);
  margin-bottom: 20px;
  max-width: 280px;
}

.footer-col-title {
  font-size: 13px;
  font-weight: 700;
  color: rgba(255,255,255,0.85);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  margin-bottom: 18px;
}

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

.footer-links a {
  font-size: 13px;
  color: rgba(255,255,255,0.45);
  transition: color var(--transition-fast);
}

.footer-links a:hover {
  color: rgba(255,255,255,0.85);
}

.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.08);
  padding: 20px 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
}

.footer-copyright {
  font-size: 12px;
  color: rgba(255,255,255,0.3);
}

.footer-bottom-links {
  display: flex;
  gap: 20px;
}

.footer-bottom-links a {
  font-size: 12px;
  color: rgba(255,255,255,0.3);
  transition: color var(--transition-fast);
}

.footer-bottom-links a:hover {
  color: rgba(255,255,255,0.6);
}

/* ---------- Hot Topics List ---------- */
.topic-list {
  display: flex;
  flex-direction: column;
  gap: 1px;
  background: var(--color-border-light);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.topic-item {
  background: var(--color-white);
  padding: 18px 20px;
  display: flex;
  align-items: center;
  gap: 16px;
  transition: background var(--transition-fast);
  cursor: pointer;
}

.topic-item:hover {
  background: var(--color-section-alt);
}

.topic-rank {
  width: 28px;
  height: 28px;
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 13px;
  font-weight: 800;
  flex-shrink: 0;
}

.topic-rank.rank-1 { background: #e63946; color: #fff; }
.topic-rank.rank-2 { background: #f97316; color: #fff; }
.topic-rank.rank-3 { background: #f59e0b; color: #fff; }
.topic-rank.rank-other { background: var(--color-border-light); color: var(--color-text-muted); }

.topic-content {
  flex: 1;
  min-width: 0;
}

.topic-title {
  font-size: 14px;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 4px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.topic-meta {
  font-size: 12px;
  color: var(--color-text-muted);
  display: flex;
  gap: 12px;
}

.topic-hot {
  display: flex;
  align-items: center;
  gap: 4px;
  font-size: 12px;
  color: var(--color-accent);
  font-weight: 600;
  flex-shrink: 0;
}

/* ---------- About / Community Section ---------- */
.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 80px;
  align-items: center;
}

.about-features {
  display: flex;
  flex-direction: column;
  gap: 24px;
  margin-top: 36px;
}

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

.about-feature-icon {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-md);
  background: rgba(230,57,70,0.08);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
  flex-shrink: 0;
}

.about-feature-text h4 {
  font-size: 15px;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 4px;
}

.about-feature-text p {
  font-size: 13px;
  color: var(--color-text-muted);
  line-height: 1.7;
}

/* ---------- Inner Page Styles ---------- */
.page-header {
  background: linear-gradient(135deg, var(--color-primary) 0%, #0f3460 100%);
  padding: 60px 0 50px;
  margin-top: var(--nav-height);
}

.page-header-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

.breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  color: rgba(255,255,255,0.5);
  margin-bottom: 16px;
}

.breadcrumb a {
  color: rgba(255,255,255,0.5);
  transition: color var(--transition-fast);
}

.breadcrumb a:hover { color: rgba(255,255,255,0.85); }
.breadcrumb span { color: rgba(255,255,255,0.3); }

.page-title {
  font-size: clamp(1.6rem, 3vw, 2.4rem);
  font-weight: 800;
  color: #fff;
  letter-spacing: -0.03em;
  margin-bottom: 8px;
}

.page-desc {
  font-size: 15px;
  color: rgba(255,255,255,0.6);
}

.page-content {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 48px 24px;
}

/* ---------- Sidebar Layout ---------- */
.sidebar-layout {
  display: grid;
  grid-template-columns: 1fr 300px;
  gap: 32px;
  align-items: start;
}

.sidebar-card {
  background: var(--color-white);
  border-radius: var(--radius-lg);
  padding: 24px;
  border: 1px solid var(--color-border-light);
  margin-bottom: 20px;
}

.sidebar-card-title {
  font-size: 14px;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 16px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--color-border-light);
}

/* ---------- Pagination ---------- */
.pagination {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  margin-top: 40px;
}

.page-btn {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 13px;
  font-weight: 500;
  color: var(--color-text-muted);
  background: var(--color-white);
  border: 1px solid var(--color-border);
  transition: all var(--transition-fast);
  cursor: pointer;
}

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

/* ---------- Rank Table ---------- */
.rank-table {
  width: 100%;
  border-collapse: collapse;
}

.rank-table th {
  text-align: left;
  padding: 12px 16px;
  font-size: 12px;
  font-weight: 700;
  color: var(--color-text-muted);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  border-bottom: 1px solid var(--color-border-light);
  background: var(--color-section-alt);
}

.rank-table td {
  padding: 14px 16px;
  font-size: 14px;
  border-bottom: 1px solid var(--color-border-light);
  vertical-align: middle;
}

.rank-table tr:hover td {
  background: var(--color-section-alt);
}

.rank-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 26px;
  height: 26px;
  border-radius: 6px;
  font-size: 12px;
  font-weight: 800;
}

/* ---------- Tag Cloud ---------- */
.tag-cloud {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.tag {
  padding: 5px 12px;
  background: var(--color-section-alt);
  border: 1px solid var(--color-border);
  border-radius: 50px;
  font-size: 12px;
  color: var(--color-text-muted);
  transition: all var(--transition-fast);
  cursor: pointer;
}

.tag:hover {
  background: var(--color-accent);
  border-color: var(--color-accent);
  color: #fff;
}

/* ---------- Loading Skeleton ---------- */
@keyframes shimmer {
  0% { background-position: -1000px 0; }
  100% { background-position: 1000px 0; }
}

.skeleton {
  background: linear-gradient(90deg, #f0f0f0 25%, #e0e0e0 50%, #f0f0f0 75%);
  background-size: 1000px 100%;
  animation: shimmer 1.5s infinite;
  border-radius: var(--radius-sm);
}

/* ---------- Scroll to Top ---------- */
.scroll-top {
  position: fixed;
  bottom: 32px;
  right: 32px;
  width: 44px;
  height: 44px;
  background: var(--color-accent);
  color: #fff;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-md);
  cursor: pointer;
  opacity: 0;
  transform: translateY(20px);
  transition: all var(--transition);
  z-index: 500;
  font-size: 18px;
}

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

.scroll-top:hover {
  background: #c62828;
  transform: translateY(-3px);
}

/* ---------- Responsive ---------- */
@media (max-width: 1024px) {
  .hero-content {
    grid-template-columns: 1fr;
    gap: 40px;
    text-align: center;
  }
  .hero-desc { margin: 0 auto 36px; }
  .hero-actions { justify-content: center; }
  .hero-stats { justify-content: center; }
  .hero-visual { display: none; }
  .about-grid { grid-template-columns: 1fr; gap: 40px; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 32px; }
  .sidebar-layout { grid-template-columns: 1fr; }
}

@media (max-width: 768px) {
  :root { --nav-height: 60px; }
  .nav-links, .nav-actions { display: none; }
  .nav-mobile-toggle { display: flex; }
  .nav-links.mobile-open {
    display: flex;
    flex-direction: column;
    position: fixed;
    top: var(--nav-height);
    left: 0;
    right: 0;
    background: var(--color-white);
    padding: 16px 24px 24px;
    border-bottom: 1px solid var(--color-border-light);
    box-shadow: var(--shadow-md);
    z-index: 999;
    gap: 4px;
  }
  .nav-links.mobile-open a { padding: 10px 14px; }
  .section { padding: 56px 0; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr; gap: 24px; }
  .video-grid { grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); }
  .category-grid { grid-template-columns: repeat(3, 1fr); }
  .search-hot-tags { display: none; }
  .hero { min-height: auto; }
  .hero-content { padding: 56px 24px; }
  .hero-stats { gap: 20px; }
}

@media (max-width: 480px) {
  .container { padding: 0 16px; }
  .hero-content { padding: 48px 16px; }
  .stats-grid { grid-template-columns: 1fr 1fr; }
  .category-grid { grid-template-columns: repeat(2, 1fr); }
  .video-grid { grid-template-columns: 1fr; }
  .testimonials-grid { grid-template-columns: 1fr; }
  .footer-bottom { flex-direction: column; text-align: center; }
}