/* ========================================
   17C视频社区 - 暗黑潮流霓虹风格主样式
   ======================================== */

/* CSS变量 */
:root {
  --neon-purple: #a855f7;
  --neon-gold: #f59e0b;
  --neon-blue: #06b6d4;
  --dark-bg: #080810;
  --dark-card: #0f0f1a;
  --dark-border: #1e1e35;
  --text-primary: #f0f0ff;
  --text-secondary: #9090b0;
  --gradient-main: linear-gradient(135deg, #a855f7 0%, #f59e0b 100%);
  --gradient-primary: linear-gradient(135deg, #a855f7 0%, #f59e0b 100%);
  --gradient-dark: linear-gradient(180deg, #080810 0%, #0a0a18 100%);
  --shadow-neon: 0 0 20px rgba(168, 85, 247, 0.4), 0 0 40px rgba(245, 158, 11, 0.2);
  --shadow-card: 0 4px 30px rgba(0, 0, 0, 0.6);
}

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

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

body {
  background: var(--dark-bg);
  color: var(--text-primary);
  font-family: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', sans-serif;
  line-height: 1.6;
  overflow-x: hidden;
  min-height: 100vh;
}

/* 粒子背景 */
body::before {
  content: '';
  position: fixed;
  top: 0; left: 0; right: 0; bottom: 0;
  background-image:
    radial-gradient(1px 1px at 20% 30%, rgba(168, 85, 247, 0.3) 0%, transparent 100%),
    radial-gradient(1px 1px at 80% 70%, rgba(245, 158, 11, 0.3) 0%, transparent 100%),
    radial-gradient(1px 1px at 50% 50%, rgba(6, 182, 212, 0.2) 0%, transparent 100%);
  pointer-events: none;
  z-index: 0;
}

a {
  color: var(--neon-purple);
  text-decoration: none;
  transition: color 0.3s ease;
}

a:hover {
  color: var(--neon-gold);
}

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

/* 容器 */
.container {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 20px;
  position: relative;
  z-index: 1;
}

/* ========================================
   顶部导航
   ======================================== */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(8, 8, 16, 0.92);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--dark-border);
  box-shadow: 0 2px 20px rgba(168, 85, 247, 0.15);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
  padding: 0 20px;
  max-width: 1280px;
  margin: 0 auto;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.6rem;
  font-weight: 900;
  letter-spacing: 2px;
  background: var(--gradient-main);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  text-shadow: none;
  filter: drop-shadow(0 0 8px rgba(168, 85, 247, 0.6));
}

.logo span {
  font-size: 0.75rem;
  font-weight: 400;
  color: var(--text-secondary);
  -webkit-text-fill-color: var(--text-secondary);
  letter-spacing: 0;
}

.nav {
  display: flex;
  align-items: center;
  gap: 4px;
}

.nav a {
  color: var(--text-secondary);
  font-size: 0.9rem;
  padding: 6px 14px;
  border-radius: 6px;
  transition: all 0.3s ease;
  position: relative;
}

.nav a:hover,
.nav a.active {
  color: var(--text-primary);
  background: rgba(168, 85, 247, 0.12);
}

.nav a.active::after {
  content: '';
  position: absolute;
  bottom: -1px;
  left: 50%;
  transform: translateX(-50%);
  width: 20px;
  height: 2px;
  background: var(--gradient-main);
  border-radius: 2px;
}

.nav-cta {
  background: var(--gradient-main) !important;
  color: #fff !important;
  -webkit-text-fill-color: #fff !important;
  border-radius: 20px !important;
  padding: 6px 18px !important;
  font-weight: 600;
  box-shadow: 0 0 15px rgba(168, 85, 247, 0.4);
}

.nav-cta:hover {
  transform: translateY(-1px);
  box-shadow: 0 0 25px rgba(168, 85, 247, 0.6) !important;
}

.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 5px;
}

.hamburger span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--text-primary);
  border-radius: 2px;
  transition: all 0.3s;
}

/* ========================================
   搜索框
   ======================================== */
.search-bar {
  background: rgba(15, 15, 26, 0.95);
  border-bottom: 1px solid var(--dark-border);
  padding: 10px 0;
  position: sticky;
  top: 64px;
  z-index: 999;
}

.search-inner {
  display: flex;
  align-items: center;
  max-width: 680px;
  margin: 0 auto;
  padding: 0 20px;
  background: rgba(30, 30, 53, 0.8);
  border: 1px solid var(--dark-border);
  border-radius: 30px;
  transition: border-color 0.3s, box-shadow 0.3s;
}

.search-inner:focus-within {
  border-color: var(--neon-purple);
  box-shadow: 0 0 15px rgba(168, 85, 247, 0.25);
}

.search-inner input {
  flex: 1;
  background: transparent;
  border: none;
  outline: none;
  color: var(--text-primary);
  font-size: 0.95rem;
  padding: 10px 16px;
  font-family: inherit;
}

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

.search-btn {
  background: none;
  border: none;
  cursor: pointer;
  color: var(--neon-purple);
  padding: 8px 14px;
  font-size: 1.1rem;
  transition: color 0.3s;
}

.search-btn:hover {
  color: var(--neon-gold);
}

/* ========================================
   首屏Banner
   ======================================== */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  padding-top: 64px;
}

.hero-bg {
  position: absolute;
  inset: 0;
  background-image: url('../images/banner.jpg');
  background-size: cover;
  background-position: center;
  filter: brightness(0.35);
  z-index: 0;
}

.hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(
    135deg,
    rgba(168, 85, 247, 0.15) 0%,
    rgba(8, 8, 16, 0.5) 50%,
    rgba(245, 158, 11, 0.1) 100%
  );
  z-index: 1;
}

.hero-content {
  position: relative;
  z-index: 2;
  text-align: center;
  max-width: 900px;
  padding: 40px 20px;
}

.hero-badge {
  display: inline-block;
  background: rgba(168, 85, 247, 0.15);
  border: 1px solid rgba(168, 85, 247, 0.4);
  color: var(--neon-purple);
  font-size: 0.8rem;
  letter-spacing: 3px;
  padding: 6px 20px;
  border-radius: 20px;
  margin-bottom: 24px;
  text-transform: uppercase;
}

.hero h1 {
  font-size: clamp(2.5rem, 6vw, 5rem);
  font-weight: 900;
  line-height: 1.1;
  margin-bottom: 20px;
  background: var(--gradient-main);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  filter: drop-shadow(0 0 20px rgba(168, 85, 247, 0.5));
}

.hero-sub {
  font-size: clamp(1rem, 2vw, 1.3rem);
  color: var(--text-secondary);
  margin-bottom: 16px;
  letter-spacing: 1px;
}

.hero-desc {
  font-size: 0.95rem;
  color: rgba(144, 144, 176, 0.8);
  margin-bottom: 40px;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

.hero-btns {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
}

.btn-primary {
  background: var(--gradient-main);
  color: #fff;
  border: none;
  padding: 14px 36px;
  border-radius: 30px;
  font-size: 1rem;
  font-weight: 700;
  cursor: pointer;
  transition: all 0.3s ease;
  box-shadow: 0 0 20px rgba(168, 85, 247, 0.5);
  text-decoration: none;
  display: inline-block;
}

.btn-primary:hover {
  transform: translateY(-3px);
  box-shadow: 0 0 35px rgba(168, 85, 247, 0.7);
  color: #fff;
}

.btn-outline {
  background: transparent;
  color: var(--text-primary);
  border: 1px solid rgba(168, 85, 247, 0.5);
  padding: 14px 36px;
  border-radius: 30px;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.3s ease;
  text-decoration: none;
  display: inline-block;
}

.btn-outline:hover {
  border-color: var(--neon-purple);
  background: rgba(168, 85, 247, 0.1);
  color: var(--text-primary);
  transform: translateY(-2px);
}

.hero-stats {
  display: flex;
  gap: 40px;
  justify-content: center;
  margin-top: 50px;
  flex-wrap: wrap;
}

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

.hero-stat .num {
  font-size: 2rem;
  font-weight: 900;
  background: var(--gradient-main);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-stat .label {
  font-size: 0.8rem;
  color: var(--text-secondary);
  letter-spacing: 1px;
}

/* ========================================
   通用区块样式
   ======================================== */
.section {
  padding: 80px 0;
  position: relative;
  z-index: 1;
}

.section-alt {
  background: rgba(15, 15, 26, 0.6);
}

.section-header {
  text-align: center;
  margin-bottom: 50px;
}

.section-tag {
  display: inline-block;
  background: rgba(168, 85, 247, 0.1);
  border: 1px solid rgba(168, 85, 247, 0.3);
  color: var(--neon-purple);
  font-size: 0.75rem;
  letter-spacing: 3px;
  padding: 4px 16px;
  border-radius: 12px;
  margin-bottom: 12px;
  text-transform: uppercase;
}

.section-title {
  font-size: clamp(1.6rem, 3vw, 2.4rem);
  font-weight: 800;
  color: var(--text-primary);
  margin-bottom: 12px;
  line-height: 1.2;
}

.section-title span {
  background: var(--gradient-main);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.section-desc {
  color: var(--text-secondary);
  font-size: 1rem;
  max-width: 600px;
  margin: 0 auto;
}

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

.video-card {
  background: var(--dark-card);
  border: 1px solid var(--dark-border);
  border-radius: 12px;
  overflow: hidden;
  transition: all 0.4s ease;
  cursor: pointer;
}

.video-card:hover {
  transform: translateY(-6px);
  border-color: rgba(168, 85, 247, 0.5);
  box-shadow: var(--shadow-neon);
}

.video-thumb {
  position: relative;
  aspect-ratio: 16/9;
  overflow: hidden;
  background: #0a0a18;
}

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

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

.video-play-btn {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(0, 0, 0, 0);
  transition: background 0.3s ease;
  opacity: 0;
}

.video-card:hover .video-play-btn {
  opacity: 1;
  background: rgba(0, 0, 0, 0.45);
}

.play-icon {
  width: 60px;
  height: 60px;
  background: var(--gradient-main);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 0 30px rgba(168, 85, 247, 0.7);
  transform: scale(0.8);
  transition: transform 0.3s ease;
}

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

.play-icon::after {
  content: '';
  border-left: 20px solid #fff;
  border-top: 12px solid transparent;
  border-bottom: 12px solid transparent;
  margin-left: 4px;
}

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

.video-tag {
  position: absolute;
  top: 8px;
  left: 8px;
  background: var(--gradient-main);
  color: #fff;
  font-size: 0.7rem;
  padding: 2px 10px;
  border-radius: 10px;
  font-weight: 600;
}

.video-info {
  padding: 14px 16px;
}

.video-title {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 8px;
  line-height: 1.4;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.video-meta {
  display: flex;
  gap: 12px;
  font-size: 0.8rem;
  color: var(--text-secondary);
}

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

/* ========================================
   社区模块
   ======================================== */
.community-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 20px;
}

.topic-card {
  background: var(--dark-card);
  border: 1px solid var(--dark-border);
  border-radius: 12px;
  padding: 20px;
  transition: all 0.3s ease;
  position: relative;
  overflow: hidden;
}

.topic-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 3px;
  background: var(--gradient-main);
}

.topic-card:hover {
  border-color: rgba(168, 85, 247, 0.4);
  transform: translateY(-3px);
  box-shadow: var(--shadow-card);
}

.topic-tag {
  display: inline-block;
  background: rgba(168, 85, 247, 0.12);
  color: var(--neon-purple);
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 10px;
  padding: 4px 12px;
  border-radius: 8px;
}

.topic-hot {
  font-size: 0.8rem;
  color: var(--neon-gold);
  margin-bottom: 8px;
}

.topic-desc {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.5;
}

/* 弹幕效果 */
.danmaku-wrap {
  background: rgba(15, 15, 26, 0.8);
  border: 1px solid var(--dark-border);
  border-radius: 12px;
  padding: 20px;
  margin-top: 30px;
  overflow: hidden;
  position: relative;
  height: 80px;
}

.danmaku-track {
  display: flex;
  gap: 40px;
  animation: danmaku-scroll 20s linear infinite;
  white-space: nowrap;
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
}

@keyframes danmaku-scroll {
  0% { transform: translateX(100%) translateY(-50%); }
  100% { transform: translateX(-200%) translateY(-50%); }
}

.danmaku-item {
  font-size: 0.9rem;
  color: var(--text-secondary);
  padding: 4px 12px;
  background: rgba(168, 85, 247, 0.08);
  border-radius: 20px;
  border: 1px solid rgba(168, 85, 247, 0.15);
  white-space: nowrap;
}

/* ========================================
   AI模块
   ======================================== */
.ai-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 20px;
}

.ai-card {
  background: var(--dark-card);
  border: 1px solid var(--dark-border);
  border-radius: 12px;
  padding: 28px 22px;
  text-align: center;
  transition: all 0.3s ease;
  position: relative;
  overflow: hidden;
}

.ai-card::after {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at 50% 0%, rgba(168, 85, 247, 0.08) 0%, transparent 70%);
  pointer-events: none;
}

.ai-card:hover {
  border-color: rgba(168, 85, 247, 0.5);
  transform: translateY(-4px);
  box-shadow: var(--shadow-neon);
}

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

.ai-card h3 {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 8px;
}

.ai-card p {
  font-size: 0.85rem;
  color: var(--text-secondary);
  line-height: 1.5;
}

.ai-badge {
  display: inline-block;
  background: rgba(245, 158, 11, 0.15);
  color: var(--neon-gold);
  font-size: 0.7rem;
  padding: 2px 10px;
  border-radius: 10px;
  margin-top: 10px;
  border: 1px solid rgba(245, 158, 11, 0.3);
}

/* ========================================
   专家模块
   ======================================== */
.experts-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 24px;
}

.expert-card {
  background: var(--dark-card);
  border: 1px solid var(--dark-border);
  border-radius: 16px;
  padding: 28px;
  text-align: center;
  transition: all 0.3s ease;
}

.expert-card:hover {
  border-color: rgba(168, 85, 247, 0.4);
  transform: translateY(-4px);
  box-shadow: var(--shadow-card);
}

.expert-avatar {
  width: 90px;
  height: 90px;
  border-radius: 50%;
  margin: 0 auto 16px;
  border: 3px solid transparent;
  background: var(--gradient-main) border-box;
  -webkit-mask: linear-gradient(#fff 0 0) padding-box, linear-gradient(#fff 0 0);
  -webkit-mask-composite: destination-out;
  mask-composite: exclude;
  overflow: hidden;
}

.expert-avatar img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: 50%;
}

.expert-name {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 4px;
}

.expert-title {
  font-size: 0.85rem;
  color: var(--neon-purple);
  margin-bottom: 12px;
}

.expert-desc {
  font-size: 0.85rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* ========================================
   用户评价
   ======================================== */
.reviews-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 20px;
}

.review-card {
  background: var(--dark-card);
  border: 1px solid var(--dark-border);
  border-radius: 12px;
  padding: 22px;
  transition: all 0.3s ease;
  position: relative;
}

.review-card:hover {
  border-color: rgba(168, 85, 247, 0.3);
  box-shadow: var(--shadow-card);
}

.review-stars {
  color: var(--neon-gold);
  font-size: 0.9rem;
  margin-bottom: 12px;
  letter-spacing: 2px;
}

.review-text {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 16px;
  font-style: italic;
}

.review-user {
  display: flex;
  align-items: center;
  gap: 10px;
}

.review-avatar {
  width: 38px;
  height: 38px;
  border-radius: 50%;
  background: var(--gradient-main);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
  font-weight: 700;
  color: #fff;
  flex-shrink: 0;
}

.review-name {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-primary);
}

.review-date {
  font-size: 0.75rem;
  color: var(--text-secondary);
}

/* ========================================
   合作伙伴
   ======================================== */
.partners-section {
  background: rgba(15, 15, 26, 0.8);
  border-top: 1px solid var(--dark-border);
  border-bottom: 1px solid var(--dark-border);
  padding: 50px 0;
}

.partners-logos {
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
  justify-content: center;
  align-items: center;
  margin-top: 30px;
}

.partner-logo {
  background: rgba(30, 30, 53, 0.6);
  border: 1px solid var(--dark-border);
  border-radius: 10px;
  padding: 14px 28px;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-secondary);
  transition: all 0.3s ease;
  min-width: 120px;
  text-align: center;
}

.partner-logo:hover {
  border-color: rgba(168, 85, 247, 0.4);
  color: var(--text-primary);
  background: rgba(168, 85, 247, 0.08);
}

/* ========================================
   FAQ
   ======================================== */
.faq-list {
  max-width: 800px;
  margin: 0 auto;
}

.faq-item {
  background: var(--dark-card);
  border: 1px solid var(--dark-border);
  border-radius: 10px;
  margin-bottom: 12px;
  overflow: hidden;
  transition: border-color 0.3s;
}

.faq-item:hover {
  border-color: rgba(168, 85, 247, 0.3);
}

.faq-q {
  padding: 18px 22px;
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-primary);
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  user-select: none;
}

.faq-q::after {
  content: '+';
  font-size: 1.3rem;
  color: var(--neon-purple);
  transition: transform 0.3s;
  flex-shrink: 0;
}

.faq-item.open .faq-q::after {
  transform: rotate(45deg);
}

.faq-a {
  padding: 0 22px;
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s ease, padding 0.3s ease;
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.7;
}

.faq-item.open .faq-a {
  max-height: 200px;
  padding: 0 22px 18px;
}

/* ========================================
   联系模块
   ======================================== */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
  align-items: start;
}

.contact-info h3 {
  font-size: 1.4rem;
  font-weight: 800;
  margin-bottom: 20px;
  background: var(--gradient-main);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.contact-item {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  margin-bottom: 16px;
  font-size: 0.9rem;
  color: var(--text-secondary);
}

.contact-icon {
  font-size: 1.1rem;
  flex-shrink: 0;
  margin-top: 2px;
}

.qrcode-wrap {
  text-align: center;
}

.qrcode-wrap img {
  width: 160px;
  height: 160px;
  object-fit: cover;
  border-radius: 12px;
  border: 2px solid rgba(168, 85, 247, 0.3);
  margin: 0 auto 10px;
}

.qrcode-label {
  font-size: 0.85rem;
  color: var(--text-secondary);
}

/* ========================================
   页脚
   ======================================== */
.footer {
  background: rgba(5, 5, 12, 0.98);
  border-top: 1px solid var(--dark-border);
  padding: 50px 0 30px;
}

.footer-top {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 40px;
}

.footer-brand .logo {
  font-size: 1.4rem;
  margin-bottom: 14px;
  display: inline-block;
}

.footer-brand p {
  font-size: 0.85rem;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 16px;
}

.footer-social {
  display: flex;
  gap: 10px;
}

.social-btn {
  width: 36px;
  height: 36px;
  background: rgba(30, 30, 53, 0.8);
  border: 1px solid var(--dark-border);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.85rem;
  color: var(--text-secondary);
  transition: all 0.3s;
  text-decoration: none;
}

.social-btn:hover {
  border-color: var(--neon-purple);
  color: var(--neon-purple);
  background: rgba(168, 85, 247, 0.1);
}

.footer-col h4 {
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 16px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--dark-border);
}

.footer-col ul {
  list-style: none;
}

.footer-col ul li {
  margin-bottom: 8px;
}

.footer-col ul li a {
  font-size: 0.85rem;
  color: var(--text-secondary);
  transition: color 0.3s;
}

.footer-col ul li a:hover {
  color: var(--neon-purple);
}

.footer-bottom {
  border-top: 1px solid var(--dark-border);
  padding-top: 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
}

.footer-copy {
  font-size: 0.82rem;
  color: var(--text-secondary);
}

.footer-links {
  display: flex;
  gap: 16px;
}

.footer-links a {
  font-size: 0.82rem;
  color: var(--text-secondary);
}

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

/* ========================================
   内页通用
   ======================================== */
.page-hero {
  background: linear-gradient(135deg, rgba(168, 85, 247, 0.1) 0%, rgba(245, 158, 11, 0.05) 100%);
  border-bottom: 1px solid var(--dark-border);
  padding: 100px 0 50px;
  text-align: center;
}

.page-hero h1 {
  font-size: clamp(1.8rem, 4vw, 3rem);
  font-weight: 900;
  background: var(--gradient-main);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 12px;
}

.page-hero p {
  font-size: 1rem;
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto;
}

.breadcrumb {
  font-size: 0.82rem;
  color: var(--text-secondary);
  margin-bottom: 16px;
}

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

.breadcrumb a:hover {
  color: var(--neon-purple);
}

.breadcrumb span {
  margin: 0 6px;
}

/* ========================================
   标签页
   ======================================== */
.tabs {
  display: flex;
  gap: 8px;
  margin-bottom: 30px;
  flex-wrap: wrap;
}

.tab-btn {
  background: rgba(30, 30, 53, 0.6);
  border: 1px solid var(--dark-border);
  color: var(--text-secondary);
  padding: 8px 20px;
  border-radius: 20px;
  font-size: 0.9rem;
  cursor: pointer;
  transition: all 0.3s;
  font-family: inherit;
}

.tab-btn:hover,
.tab-btn.active {
  background: rgba(168, 85, 247, 0.15);
  border-color: var(--neon-purple);
  color: var(--neon-purple);
}

/* ========================================
   工具卡片
   ======================================== */
.tool-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 20px;
}

.tool-card {
  background: var(--dark-card);
  border: 1px solid var(--dark-border);
  border-radius: 14px;
  padding: 24px;
  transition: all 0.3s ease;
  position: relative;
  overflow: hidden;
}

.tool-card::before {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(circle, rgba(168, 85, 247, 0.04) 0%, transparent 60%);
  pointer-events: none;
}

.tool-card:hover {
  border-color: rgba(168, 85, 247, 0.5);
  transform: translateY(-4px);
  box-shadow: var(--shadow-neon);
}

.tool-icon {
  font-size: 2.2rem;
  margin-bottom: 14px;
}

.tool-card h3 {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 8px;
}

.tool-card p {
  font-size: 0.85rem;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 14px;
}

.tool-btn {
  display: inline-block;
  background: rgba(168, 85, 247, 0.12);
  border: 1px solid rgba(168, 85, 247, 0.3);
  color: var(--neon-purple);
  font-size: 0.82rem;
  padding: 6px 16px;
  border-radius: 16px;
  transition: all 0.3s;
  cursor: pointer;
  font-family: inherit;
}

.tool-btn:hover {
  background: rgba(168, 85, 247, 0.25);
  color: var(--text-primary);
}

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

@media (max-width: 768px) {
  .nav {
    display: none;
    position: fixed;
    top: 64px;
    left: 0;
    right: 0;
    background: rgba(8, 8, 16, 0.98);
    flex-direction: column;
    padding: 20px;
    border-bottom: 1px solid var(--dark-border);
    gap: 8px;
  }
  .nav.open {
    display: flex;
  }
  .hamburger {
    display: flex;
  }
  .hero h1 {
    font-size: 2rem;
  }
  .hero-stats {
    gap: 24px;
  }
  .video-grid {
    grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  }
  .footer-top {
    grid-template-columns: 1fr;
    gap: 24px;
  }
  .footer-bottom {
    flex-direction: column;
    text-align: center;
  }
  .section {
    padding: 50px 0;
  }
}

@media (max-width: 480px) {
  .hero-btns {
    flex-direction: column;
    align-items: center;
  }
  .video-grid {
    grid-template-columns: 1fr;
  }
  .experts-grid,
  .reviews-grid,
  .ai-grid {
    grid-template-columns: 1fr;
  }
}

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

@keyframes pulse-glow {
  0%, 100% { box-shadow: 0 0 15px rgba(168, 85, 247, 0.3); }
  50% { box-shadow: 0 0 30px rgba(168, 85, 247, 0.6), 0 0 50px rgba(245, 158, 11, 0.3); }
}

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

.pulse-glow {
  animation: pulse-glow 3s ease-in-out infinite;
}

/* 懒加载占位 */
img[data-src] {
  background: var(--dark-card);
  min-height: 100px;
}

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

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

::-webkit-scrollbar-thumb {
  background: rgba(168, 85, 247, 0.4);
  border-radius: 3px;
}

::-webkit-scrollbar-thumb:hover {
  background: rgba(168, 85, 247, 0.7);
}

/* 关于页面响应式 */
@media (max-width: 768px) {
  .about-grid {
    grid-template-columns: 1fr !important;
  }
}

/* 更新时间标签 */
.update-time {
  font-size: 0.78rem;
  color: var(--text-secondary);
  padding: 2px 10px;
  background: rgba(30, 30, 53, 0.6);
  border-radius: 10px;
  border: 1px solid var(--dark-border);
  display: inline-block;
}