/* =============================================
   17C 品牌官网 - 主样式文件
   域名: www.c46f5pw.cn
   风格: 暗黑潮流·赛博霓虹
   ============================================= */

/* ===== CSS变量 ===== */
:root {
  --color-bg:          #0a0a0f;
  --color-bg2:         #0f0f1a;
  --color-bg3:         #141428;
  --color-card:        #12121e;
  --color-card-hover:  #1a1a2e;
  --color-border:      rgba(139,47,201,0.25);
  --color-border-gold: rgba(201,162,39,0.3);
  --color-neon-purple: #8b2fc9;
  --color-neon-gold:   #c9a227;
  --color-neon-blue:   #2fc9c9;
  --color-text:        #e8e8f0;
  --color-text-muted:  #8888aa;
  --color-text-dim:    #555577;
  --grad-main:         linear-gradient(135deg, #8b2fc9 0%, #c9a227 100%);
  --grad-dark:         linear-gradient(135deg, #1a0a2e 0%, #0a1a0a 100%);
  --shadow-neon:       0 0 20px rgba(139,47,201,0.4), 0 0 40px rgba(201,162,39,0.15);
  --shadow-card:       0 4px 24px rgba(0,0,0,0.5);
  --radius-card:       12px;
  --radius-btn:        40px;
  --transition:        0.3s ease;
  --font-main:         'PingFang SC', 'Microsoft YaHei', 'Hiragino Sans GB', sans-serif;
}

/* ===== 全局重置 ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; }
body {
  background: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-main);
  line-height: 1.7;
  overflow-x: hidden;
  min-height: 100vh;
}
a { color: var(--color-neon-gold); text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--color-neon-purple); }
img { max-width: 100%; height: auto; display: block; }
ul, ol { list-style: none; }
button { cursor: pointer; border: none; background: none; font-family: inherit; }

/* ===== 粒子画布 ===== */
#particles-canvas {
  position: fixed;
  top: 0; left: 0;
  width: 100%; height: 100%;
  pointer-events: none;
  z-index: 0;
  opacity: 0.5;
}

/* ===== 顶部导航 ===== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(10,10,15,0.92);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
  padding: 0 24px;
}
.header-inner {
  max-width: 1280px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  gap: 32px;
  height: 64px;
}
.site-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
  text-decoration: none;
}
.logo-text {
  font-size: 1.6rem;
  font-weight: 900;
  letter-spacing: 2px;
  background: var(--grad-main);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  text-shadow: none;
  filter: drop-shadow(0 0 8px rgba(139,47,201,0.6));
}
.site-nav {
  display: flex;
  align-items: center;
  gap: 4px;
  flex: 1;
  flex-wrap: wrap;
}
.site-nav a {
  color: var(--color-text-muted);
  font-size: 0.9rem;
  padding: 6px 14px;
  border-radius: 20px;
  transition: all var(--transition);
  white-space: nowrap;
}
.site-nav a:hover {
  color: var(--color-text);
  background: rgba(139,47,201,0.15);
}
.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 8px;
  margin-left: auto;
}
.nav-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--color-neon-purple);
  border-radius: 2px;
  transition: all var(--transition);
}

/* ===== 搜索框 ===== */
.search-bar-wrap {
  background: var(--color-bg2);
  border-bottom: 1px solid var(--color-border);
  padding: 10px 24px;
  position: relative;
  z-index: 10;
}
.search-bar {
  max-width: 700px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  gap: 10px;
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-btn);
  padding: 8px 16px;
  transition: border-color var(--transition);
}
.search-bar:focus-within {
  border-color: var(--color-neon-purple);
  box-shadow: 0 0 0 3px rgba(139,47,201,0.15);
}
.search-bar input {
  flex: 1;
  background: none;
  border: none;
  outline: none;
  color: var(--color-text);
  font-size: 0.9rem;
  font-family: var(--font-main);
}
.search-bar input::placeholder { color: var(--color-text-dim); }
.search-btn {
  background: var(--grad-main);
  color: #fff;
  border: none;
  border-radius: 20px;
  padding: 5px 18px;
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  transition: opacity var(--transition);
  white-space: nowrap;
}
.search-btn:hover { opacity: 0.85; }

/* ===== 主内容区 ===== */
.main-content {
  position: relative;
  z-index: 1;
  min-height: 60vh;
}

/* ===== 首屏Hero ===== */
.hero-section {
  position: relative;
  min-height: 90vh;
  display: flex;
  align-items: center;
  overflow: hidden;
  padding: 80px 24px;
}
.hero-bg {
  position: absolute;
  inset: 0;
  background: 
    radial-gradient(ellipse 80% 60% at 60% 40%, rgba(139,47,201,0.18) 0%, transparent 70%),
    radial-gradient(ellipse 60% 40% at 20% 80%, rgba(201,162,39,0.12) 0%, transparent 70%),
    url('/images/banner.jpg') center/cover no-repeat;
  filter: brightness(0.35);
  z-index: 0;
}
.hero-content {
  position: relative;
  z-index: 1;
  max-width: 800px;
  margin: 0 auto;
  text-align: center;
}
.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(139,47,201,0.2);
  border: 1px solid var(--color-border);
  border-radius: 20px;
  padding: 6px 18px;
  font-size: 0.85rem;
  color: var(--color-neon-gold);
  margin-bottom: 24px;
  letter-spacing: 1px;
}
.hero-title {
  font-size: clamp(2.2rem, 6vw, 4.5rem);
  font-weight: 900;
  line-height: 1.15;
  margin-bottom: 20px;
  background: var(--grad-main);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  filter: drop-shadow(0 0 30px rgba(139,47,201,0.5));
}
.hero-subtitle {
  font-size: clamp(0.95rem, 2vw, 1.15rem);
  color: var(--color-text-muted);
  max-width: 600px;
  margin: 0 auto 32px;
  line-height: 1.8;
}
.hero-buttons {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: 48px;
}
.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--grad-main);
  color: #fff;
  border-radius: var(--radius-btn);
  padding: 13px 32px;
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: 1px;
  transition: all var(--transition);
  box-shadow: 0 4px 20px rgba(139,47,201,0.4);
  text-decoration: none;
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(139,47,201,0.6);
  color: #fff;
}
.btn-outline {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: transparent;
  color: var(--color-neon-gold);
  border: 1.5px solid var(--color-neon-gold);
  border-radius: var(--radius-btn);
  padding: 12px 28px;
  font-size: 1rem;
  font-weight: 600;
  letter-spacing: 1px;
  transition: all var(--transition);
  text-decoration: none;
}
.btn-outline:hover {
  background: rgba(201,162,39,0.1);
  transform: translateY(-2px);
  color: var(--color-neon-gold);
}
.hero-stats {
  display: flex;
  gap: 40px;
  justify-content: center;
  flex-wrap: wrap;
}
.stat-item { text-align: center; }
.stat-num {
  font-size: 1.6rem;
  font-weight: 900;
  background: var(--grad-main);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.stat-label { font-size: 0.8rem; color: var(--color-text-muted); margin-top: 4px; }

/* ===== 霓虹分隔线 ===== */
.neon-line {
  height: 2px;
  background: var(--grad-main);
  opacity: 0.4;
  box-shadow: 0 0 12px rgba(139,47,201,0.5);
}
.section-divider {
  height: 1px;
  background: var(--color-border);
  margin: 0 24px;
}

/* ===== 通用Section ===== */
.section {
  padding: 80px 24px;
  max-width: 1280px;
  margin: 0 auto;
}
.section-header {
  text-align: center;
  margin-bottom: 48px;
}
.section-tag {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 3px;
  color: var(--color-neon-purple);
  background: rgba(139,47,201,0.1);
  border: 1px solid rgba(139,47,201,0.3);
  border-radius: 20px;
  padding: 4px 16px;
  margin-bottom: 16px;
  text-transform: uppercase;
}
.section-title {
  font-size: clamp(1.6rem, 3.5vw, 2.4rem);
  font-weight: 900;
  color: var(--color-text);
  margin-bottom: 16px;
  line-height: 1.3;
}
.section-title span {
  background: var(--grad-main);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.section-desc {
  font-size: 1rem;
  color: var(--color-text-muted);
  max-width: 600px;
  margin: 0 auto;
  line-height: 1.8;
}

/* ===== 视频网格 ===== */
.video-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 24px;
}
.video-card {
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-card);
  overflow: hidden;
  cursor: pointer;
  transition: border-color var(--transition), box-shadow var(--transition), transform var(--transition);
}
.video-card:hover {
  border-color: var(--color-neon-purple);
  box-shadow: var(--shadow-neon);
  transform: translateY(-4px);
}
.video-thumb {
  position: relative;
  aspect-ratio: 16/9;
  overflow: hidden;
  background: var(--color-bg3);
}
.video-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s ease;
}
.video-card:hover .video-thumb img { transform: scale(1.05); }

/* 播放按钮 */
.video-play-btn {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(0,0,0,0.3);
  opacity: 0;
  transition: opacity var(--transition);
}
.video-card:hover .video-play-btn { opacity: 1; }
.play-icon {
  width: 56px;
  height: 56px;
  background: var(--grad-main);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 0 20px rgba(139,47,201,0.6);
  transition: transform var(--transition);
}
.play-icon:hover { transform: scale(1.1); }
.play-icon svg {
  width: 24px;
  height: 24px;
  fill: #fff;
  margin-left: 3px;
}
.video-tag {
  position: absolute;
  top: 10px;
  left: 10px;
  background: var(--grad-main);
  color: #fff;
  font-size: 0.72rem;
  font-weight: 700;
  padding: 3px 10px;
  border-radius: 12px;
  letter-spacing: 0.5px;
}
.video-duration {
  position: absolute;
  bottom: 8px;
  right: 8px;
  background: rgba(0,0,0,0.75);
  color: #fff;
  font-size: 0.75rem;
  padding: 2px 7px;
  border-radius: 6px;
}
.video-info { padding: 14px 16px 16px; }
.video-title {
  font-size: 0.9rem;
  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;
  gap: 12px;
  font-size: 0.78rem;
  color: var(--color-text-muted);
  flex-wrap: wrap;
}

/* ===== 过滤标签 ===== */
.filter-tabs {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  margin-bottom: 32px;
  justify-content: center;
}
.filter-tab {
  background: var(--color-card);
  border: 1px solid var(--color-border);
  color: var(--color-text-muted);
  border-radius: 20px;
  padding: 7px 18px;
  font-size: 0.85rem;
  cursor: pointer;
  transition: all var(--transition);
  font-family: var(--font-main);
}
.filter-tab:hover,
.filter-tab.active {
  background: var(--grad-main);
  border-color: transparent;
  color: #fff;
  font-weight: 600;
}

/* ===== 社区模块 ===== */
.community-section {
  background: var(--color-bg2);
  padding: 60px 24px;
}
.community-inner {
  max-width: 1280px;
  margin: 0 auto;
}
.topic-list {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  justify-content: center;
  margin-bottom: 32px;
}
.topic-tag {
  background: var(--color-card);
  border: 1px solid var(--color-border);
  color: var(--color-text);
  border-radius: 20px;
  padding: 7px 16px;
  font-size: 0.85rem;
  cursor: pointer;
  transition: all var(--transition);
  display: flex;
  align-items: center;
  gap: 8px;
}
.topic-tag:hover {
  border-color: var(--color-neon-purple);
  background: rgba(139,47,201,0.1);
}
.topic-hot {
  font-size: 0.75rem;
  color: var(--color-neon-gold);
  font-weight: 700;
}

/* 弹幕滚动 */
.danmaku-wrap {
  overflow: hidden;
  padding: 12px 0;
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
}
.danmaku-track {
  display: flex;
  gap: 40px;
  white-space: nowrap;
  animation: danmaku-scroll 30s linear infinite;
}
.danmaku-item {
  font-size: 0.85rem;
  color: var(--color-text-muted);
  padding: 4px 16px;
  background: rgba(139,47,201,0.08);
  border-radius: 20px;
  border: 1px solid rgba(139,47,201,0.15);
  flex-shrink: 0;
}
@keyframes danmaku-scroll {
  from { transform: translateX(0); }
  to   { transform: translateX(-50%); }
}

/* ===== AI工具网格 ===== */
.ai-tools-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 24px;
}
.ai-tool-card {
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-card);
  padding: 28px 24px;
  transition: all var(--transition);
}
.ai-tool-card:hover {
  border-color: var(--color-neon-gold);
  box-shadow: 0 0 20px rgba(201,162,39,0.2);
  transform: translateY(-3px);
}
.ai-tool-icon {
  font-size: 2.2rem;
  margin-bottom: 16px;
}
.ai-tool-name {
  font-size: 1rem;
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: 10px;
}
.ai-tool-desc {
  font-size: 0.875rem;
  color: var(--color-text-muted);
  line-height: 1.7;
}

/* ===== 专家网格 ===== */
.experts-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 24px;
  max-width: 900px;
  margin: 0 auto;
}
.expert-card {
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-card);
  padding: 28px 24px;
  text-align: center;
  transition: all var(--transition);
}
.expert-card:hover {
  border-color: var(--color-neon-purple);
  box-shadow: var(--shadow-neon);
  transform: translateY(-3px);
}
.expert-avatar {
  width: 90px;
  height: 90px;
  border-radius: 50%;
  overflow: hidden;
  margin: 0 auto 16px;
  border: 2px solid var(--color-neon-purple);
  box-shadow: 0 0 12px rgba(139,47,201,0.4);
}
.expert-avatar img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.expert-name {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: 6px;
}
.expert-role {
  font-size: 0.82rem;
  color: var(--color-neon-gold);
  margin-bottom: 12px;
  font-weight: 600;
}
.expert-desc {
  font-size: 0.85rem;
  color: var(--color-text-muted);
  line-height: 1.7;
}

/* ===== 评价网格 ===== */
.reviews-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 24px;
}
.review-card {
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-card);
  padding: 24px;
  transition: all var(--transition);
}
.review-card:hover {
  border-color: var(--color-neon-gold);
  box-shadow: 0 0 16px rgba(201,162,39,0.2);
}
.review-stars {
  color: var(--color-neon-gold);
  font-size: 1rem;
  margin-bottom: 12px;
  letter-spacing: 2px;
}
.review-text {
  font-size: 0.9rem;
  color: var(--color-text-muted);
  line-height: 1.8;
  margin-bottom: 16px;
}
.review-user {
  display: flex;
  align-items: center;
  gap: 12px;
}
.review-avatar {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--grad-main);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.85rem;
  font-weight: 700;
  color: #fff;
  flex-shrink: 0;
}
.review-name {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--color-text);
}
.review-date {
  font-size: 0.78rem;
  color: var(--color-text-dim);
  margin-top: 2px;
}

/* ===== 合作伙伴 ===== */
.partners-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
  gap: 16px;
  max-width: 900px;
  margin: 0 auto;
}
.partner-item {
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-card);
  padding: 20px;
  text-align: center;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--color-text-muted);
  transition: all var(--transition);
}
.partner-item:hover {
  border-color: var(--color-neon-purple);
  color: var(--color-text);
  background: rgba(139,47,201,0.08);
}

/* ===== FAQ ===== */
.faq-list {
  max-width: 860px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.faq-item {
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-card);
  overflow: hidden;
  transition: border-color var(--transition);
}
.faq-item.active { border-color: var(--color-neon-purple); }
.faq-question {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 18px 22px;
  cursor: pointer;
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--color-text);
  gap: 16px;
}
.faq-question:hover { color: var(--color-neon-gold); }
.faq-icon {
  font-size: 1.4rem;
  color: var(--color-neon-purple);
  flex-shrink: 0;
  transition: transform var(--transition);
  font-weight: 300;
}
.faq-item.active .faq-icon { transform: rotate(45deg); }
.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s ease;
}
.faq-item.active .faq-answer { max-height: 200px; }
.faq-answer-inner {
  padding: 0 22px 18px;
  font-size: 0.9rem;
  color: var(--color-text-muted);
  line-height: 1.8;
  border-top: 1px solid var(--color-border);
  padding-top: 14px;
}

/* ===== 联系卡片 ===== */
.contact-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 24px;
  max-width: 900px;
  margin: 0 auto;
}
.contact-card {
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-card);
  padding: 28px 24px;
  text-align: center;
  transition: all var(--transition);
}
.contact-card:hover {
  border-color: var(--color-neon-purple);
  box-shadow: var(--shadow-neon);
  transform: translateY(-3px);
}
.contact-icon { font-size: 2rem; margin-bottom: 12px; }
.contact-title {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: 10px;
}
.contact-value {
  font-size: 0.88rem;
  color: var(--color-text-muted);
  line-height: 1.7;
}
.qr-img {
  width: 120px;
  height: 120px;
  margin: 0 auto;
  border-radius: 8px;
  overflow: hidden;
  border: 1px solid var(--color-border);
}
.qr-img img { width: 100%; height: 100%; object-fit: cover; }

/* ===== 内页Banner ===== */
.page-banner {
  position: relative;
  min-height: 320px;
  display: flex;
  align-items: flex-end;
  padding: 48px 24px;
  overflow: hidden;
}
.page-banner-bg {
  position: absolute;
  inset: 0;
  background-size: cover;
  background-position: center;
  filter: brightness(0.3);
  z-index: 0;
}
.page-banner-bg::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(to top, rgba(10,10,15,0.9) 0%, transparent 60%);
}
.page-banner-content {
  position: relative;
  z-index: 1;
  max-width: 1280px;
  margin: 0 auto;
  width: 100%;
}
.breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.82rem;
  color: var(--color-text-muted);
  margin-bottom: 16px;
  flex-wrap: wrap;
}
.breadcrumb a { color: var(--color-text-muted); }
.breadcrumb a:hover { color: var(--color-neon-gold); }
.breadcrumb-sep { color: var(--color-text-dim); }
.page-title {
  font-size: clamp(1.8rem, 4vw, 3rem);
  font-weight: 900;
  background: var(--grad-main);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 12px;
}
.page-subtitle {
  font-size: 1rem;
  color: var(--color-text-muted);
  max-width: 600px;
  line-height: 1.7;
}

/* ===== 页脚 ===== */
.site-footer {
  background: var(--color-bg2);
  border-top: 1px solid var(--color-border);
  padding: 60px 24px 24px;
  position: relative;
  z-index: 1;
}
.footer-inner { max-width: 1280px; margin: 0 auto; }
.footer-top {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 40px;
}
.footer-brand .site-logo { margin-bottom: 16px; }
.footer-brand p {
  font-size: 0.85rem;
  color: var(--color-text-muted);
  line-height: 1.8;
  margin-bottom: 20px;
}
.footer-social {
  display: flex;
  gap: 10px;
}
.social-btn {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: var(--color-card);
  border: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--color-text-muted);
  cursor: pointer;
  transition: all var(--transition);
}
.social-btn:hover {
  background: var(--grad-main);
  border-color: transparent;
  color: #fff;
}
.footer-col h4 {
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: 16px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--color-border);
}
.footer-links {
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.footer-links a {
  font-size: 0.85rem;
  color: var(--color-text-muted);
  transition: color var(--transition);
}
.footer-links a:hover { color: var(--color-neon-gold); }
.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
  padding-top: 24px;
  border-top: 1px solid var(--color-border);
  font-size: 0.82rem;
  color: var(--color-text-dim);
}
.footer-copyright a { color: var(--color-text-muted); }
.footer-copyright a:hover { color: var(--color-neon-gold); }
.footer-beian a {
  color: var(--color-text-dim);
  font-size: 0.78rem;
}
.footer-beian a:hover { color: var(--color-text-muted); }
.footer-update { color: var(--color-text-dim); font-size: 0.78rem; }

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

@media (max-width: 768px) {
  .site-header { padding: 0 16px; }
  .header-inner { gap: 16px; }
  .site-nav {
    display: none;
    position: fixed;
    top: 64px;
    left: 0;
    right: 0;
    background: rgba(10,10,15,0.98);
    backdrop-filter: blur(12px);
    flex-direction: column;
    padding: 20px;
    gap: 4px;
    border-bottom: 1px solid var(--color-border);
    z-index: 999;
  }
  .site-nav.open { display: flex; }
  .site-nav a { padding: 12px 16px; border-radius: 8px; }
  .nav-toggle { display: flex; }
  .hero-section { min-height: 70vh; padding: 60px 16px; }
  .section { padding: 60px 16px; }
  .footer-top { grid-template-columns: 1fr; gap: 24px; }
  .footer-bottom { flex-direction: column; text-align: center; }
  .video-grid { grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); }
  .hero-stats { gap: 24px; }
  .search-bar-wrap { padding: 10px 16px; }
  .page-banner { padding: 40px 16px; }
}

@media (max-width: 480px) {
  .hero-title { font-size: 2rem; }
  .hero-buttons { flex-direction: column; align-items: center; }
  .btn-primary, .btn-outline { width: 100%; max-width: 280px; justify-content: center; }
  .video-grid { grid-template-columns: 1fr; }
  .ai-tools-grid { grid-template-columns: 1fr; }
  .experts-grid { grid-template-columns: 1fr; }
  .reviews-grid { grid-template-columns: 1fr; }
  .contact-grid { grid-template-columns: 1fr; }
  .partners-grid { grid-template-columns: repeat(2, 1fr); }
}

/* ===== 滚动条 ===== */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--color-bg); }
::-webkit-scrollbar-thumb {
  background: var(--color-neon-purple);
  border-radius: 3px;
}
::-webkit-scrollbar-thumb:hover { background: var(--color-neon-gold); }

/* ===== 选中文字 ===== */
::selection {
  background: rgba(139,47,201,0.4);
  color: #fff;
}

/* ===== 焦点样式 ===== */
:focus-visible {
  outline: 2px solid var(--color-neon-purple);
  outline-offset: 2px;
}