/* ============================================================
   免费看片 - 汽车改装与视频社区 | usoa0g.cn
   主样式文件 style.css
   ============================================================ */

/* ---------- CSS 变量 ---------- */
:root {
  --brand-primary: #1a2a4a;
  --brand-accent: #f05a1a;
  --brand-accent2: #ffb347;
  --brand-dark: #0d1a2e;
  --brand-mid: #243656;
  --brand-light: #e8edf5;
  --brand-white: #ffffff;
  --brand-gray: #6b7a8d;
  --brand-border: #2d4060;
  --font-main: 'PingFang SC', 'Microsoft YaHei', 'Hiragino Sans GB', sans-serif;
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --shadow-card: 0 4px 24px rgba(0,0,0,0.18);
  --shadow-hover: 0 8px 40px rgba(240,90,26,0.22);
  --transition: all 0.28s cubic-bezier(0.4,0,0.2,1);
}

/* ---------- 重置与基础 ---------- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; }
body {
  font-family: var(--font-main);
  background: var(--brand-dark);
  color: var(--brand-light);
  line-height: 1.7;
  overflow-x: hidden;
}
a { color: var(--brand-accent); text-decoration: none; transition: var(--transition); }
a:hover { color: var(--brand-accent2); }
img { max-width: 100%; height: auto; display: block; }
ul { list-style: none; }
button { cursor: pointer; border: none; outline: none; }

/* ---------- 干扰标签隐藏（不破坏布局）---------- */
.kktu-noise { display: none !important; visibility: hidden !important; }

/* ---------- 通用容器 ---------- */
.container { max-width: 1200px; margin: 0 auto; padding: 0 20px; }
.section-pad { padding: 70px 0; }
.section-pad-sm { padding: 40px 0; }

/* ---------- 通用标题 ---------- */
.section-title {
  font-size: 2rem;
  font-weight: 800;
  color: var(--brand-white);
  text-align: center;
  margin-bottom: 12px;
  letter-spacing: 0.02em;
}
.section-title span { color: var(--brand-accent); }
.section-subtitle {
  text-align: center;
  color: var(--brand-gray);
  font-size: 1rem;
  margin-bottom: 48px;
}
.section-divider {
  width: 60px; height: 4px;
  background: linear-gradient(90deg, var(--brand-accent), var(--brand-accent2));
  border-radius: 2px;
  margin: 12px auto 40px;
}

/* ---------- 按钮 ---------- */
.btn-primary {
  display: inline-flex; align-items: center; gap: 8px;
  background: linear-gradient(135deg, var(--brand-accent), #d94a0a);
  color: #fff; padding: 12px 28px; border-radius: 30px;
  font-weight: 700; font-size: 0.95rem; letter-spacing: 0.03em;
  transition: var(--transition); box-shadow: 0 4px 16px rgba(240,90,26,0.35);
}
.btn-primary:hover {
  transform: translateY(-2px); box-shadow: 0 8px 28px rgba(240,90,26,0.5);
  color: #fff;
}
.btn-outline {
  display: inline-flex; align-items: center; gap: 8px;
  border: 2px solid var(--brand-accent); color: var(--brand-accent);
  padding: 10px 24px; border-radius: 30px;
  font-weight: 600; font-size: 0.9rem; transition: var(--transition);
  background: transparent;
}
.btn-outline:hover {
  background: var(--brand-accent); color: #fff;
  transform: translateY(-2px);
}
.btn-sm { padding: 8px 18px; font-size: 0.85rem; }

/* ---------- 顶部公告条 ---------- */
.top-bar {
  background: linear-gradient(90deg, var(--brand-accent), #c94010, var(--brand-accent));
  background-size: 200% 100%;
  animation: barSlide 4s linear infinite;
  color: #fff; text-align: center;
  padding: 7px 20px; font-size: 0.82rem; font-weight: 600;
  letter-spacing: 0.05em;
}
@keyframes barSlide { 0%{background-position:0%} 100%{background-position:200%} }

/* ---------- 导航栏 ---------- */
.navbar {
  position: sticky; top: 0; z-index: 1000;
  background: rgba(13,26,46,0.97);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--brand-border);
  box-shadow: 0 2px 20px rgba(0,0,0,0.4);
}
.navbar-inner {
  display: flex; align-items: center; justify-content: space-between;
  height: 68px; padding: 0 20px; max-width: 1200px; margin: 0 auto;
}
.navbar-brand {
  display: flex; align-items: center; gap: 12px;
  text-decoration: none;
}
.navbar-logo {
  width: 44px; height: 44px; border-radius: 50%;
  object-fit: cover; border: 2px solid var(--brand-accent);
}
.navbar-name {
  font-size: 1.25rem; font-weight: 900;
  color: var(--brand-white); letter-spacing: 0.05em;
}
.navbar-name em { color: var(--brand-accent); font-style: normal; }
.navbar-nav {
  display: flex; align-items: center; gap: 4px;
}
.navbar-nav a {
  color: var(--brand-light); font-size: 0.9rem; font-weight: 600;
  padding: 8px 14px; border-radius: var(--radius-sm);
  transition: var(--transition); white-space: nowrap;
}
.navbar-nav a:hover, .navbar-nav a.active {
  color: var(--brand-accent); background: rgba(240,90,26,0.1);
}
.navbar-actions { display: flex; align-items: center; gap: 12px; }
.hamburger {
  display: none; flex-direction: column; gap: 5px;
  background: none; padding: 6px;
}
.hamburger span {
  display: block; width: 24px; height: 2px;
  background: var(--brand-white); border-radius: 2px; transition: var(--transition);
}

/* ---------- 搜索框 ---------- */
.search-bar-wrap {
  background: var(--brand-mid);
  border-bottom: 1px solid var(--brand-border);
  padding: 10px 0;
}
.search-bar-inner {
  max-width: 1200px; margin: 0 auto; padding: 0 20px;
  display: flex; align-items: center; gap: 10px;
}
.search-input-box {
  flex: 1; display: flex; align-items: center;
  background: var(--brand-dark); border: 1.5px solid var(--brand-border);
  border-radius: 30px; overflow: hidden;
  transition: var(--transition);
}
.search-input-box:focus-within {
  border-color: var(--brand-accent);
  box-shadow: 0 0 0 3px rgba(240,90,26,0.15);
}
.search-input-box input {
  flex: 1; background: none; border: none; outline: none;
  color: var(--brand-white); padding: 9px 18px;
  font-size: 0.92rem; font-family: var(--font-main);
}
.search-input-box input::placeholder { color: var(--brand-gray); }
.search-btn {
  background: var(--brand-accent); color: #fff;
  padding: 9px 20px; font-size: 0.88rem; font-weight: 700;
  border-radius: 0 30px 30px 0; transition: var(--transition);
}
.search-btn:hover { background: #d94a0a; }
.search-hot-tags { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; }
.search-hot-tags span { color: var(--brand-gray); font-size: 0.8rem; }
.hot-tag {
  background: rgba(240,90,26,0.12); color: var(--brand-accent);
  border: 1px solid rgba(240,90,26,0.3); padding: 3px 10px;
  border-radius: 20px; font-size: 0.78rem; cursor: pointer;
  transition: var(--transition);
}
.hot-tag:hover { background: var(--brand-accent); color: #fff; }

/* ---------- 移动端菜单 ---------- */
.mobile-menu {
  display: none; position: fixed; top: 0; left: 0; right: 0; bottom: 0;
  background: rgba(13,26,46,0.98); z-index: 2000;
  flex-direction: column; align-items: center; justify-content: center; gap: 24px;
}
.mobile-menu.open { display: flex; }
.mobile-menu a {
  color: var(--brand-white); font-size: 1.4rem; font-weight: 700;
  transition: var(--transition);
}
.mobile-menu a:hover { color: var(--brand-accent); }
.mobile-close {
  position: absolute; top: 20px; right: 20px;
  background: none; color: var(--brand-white); font-size: 2rem;
  line-height: 1;
}

/* ---------- Hero Banner ---------- */
.hero {
  position: relative; min-height: 88vh;
  display: flex; align-items: center; overflow: hidden;
}
.hero-bg {
  position: absolute; inset: 0;
  background-image: url('../images/hero-banner.jpg');
  background-size: cover; background-position: center;
  filter: brightness(0.45);
  transform: scale(1.05);
  animation: heroZoom 12s ease-in-out infinite alternate;
}
@keyframes heroZoom { from{transform:scale(1.05)} to{transform:scale(1.12)} }
.hero-overlay {
  position: absolute; inset: 0;
  background: linear-gradient(135deg, rgba(13,26,46,0.85) 0%, rgba(240,90,26,0.15) 100%);
}
.hero-content {
  position: relative; z-index: 2;
  max-width: 1200px; margin: 0 auto; padding: 0 20px;
  width: 100%;
}
.hero-badge {
  display: inline-flex; align-items: center; gap: 8px;
  background: rgba(240,90,26,0.2); border: 1px solid rgba(240,90,26,0.5);
  color: var(--brand-accent2); padding: 6px 16px; border-radius: 20px;
  font-size: 0.82rem; font-weight: 700; margin-bottom: 20px;
  letter-spacing: 0.08em;
}
.hero-badge::before { content: '●'; animation: blink 1.2s ease-in-out infinite; }
@keyframes blink { 0%,100%{opacity:1} 50%{opacity:0.3} }
.hero h1 {
  font-size: clamp(2.2rem, 5vw, 4rem);
  font-weight: 900; color: var(--brand-white);
  line-height: 1.2; margin-bottom: 16px;
  text-shadow: 0 2px 20px rgba(0,0,0,0.5);
}
.hero h1 .highlight { color: var(--brand-accent); }
.hero-desc {
  font-size: 1.1rem; color: rgba(232,237,245,0.85);
  max-width: 600px; margin-bottom: 32px; line-height: 1.8;
}
.hero-actions { display: flex; gap: 16px; flex-wrap: wrap; margin-bottom: 48px; }
.hero-stats {
  display: flex; gap: 40px; flex-wrap: wrap;
}
.hero-stat { text-align: center; }
.hero-stat .num {
  font-size: 2rem; font-weight: 900; color: var(--brand-accent);
  display: block; line-height: 1;
}
.hero-stat .label { font-size: 0.82rem; color: var(--brand-gray); margin-top: 4px; }
.hero-scroll {
  position: absolute; bottom: 30px; left: 50%; transform: translateX(-50%);
  z-index: 2; display: flex; flex-direction: column; align-items: center; gap: 6px;
  color: rgba(255,255,255,0.5); font-size: 0.75rem;
  animation: bounce 2s ease-in-out infinite;
}
.hero-scroll::after {
  content: ''; display: block; width: 1px; height: 40px;
  background: linear-gradient(to bottom, rgba(255,255,255,0.4), transparent);
}
@keyframes bounce { 0%,100%{transform:translateX(-50%) translateY(0)} 50%{transform:translateX(-50%) translateY(8px)} }

/* ---------- 视频卡片网格 ---------- */
.video-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 24px;
}
.video-card {
  background: var(--brand-mid);
  border-radius: var(--radius-md);
  overflow: hidden;
  border: 1px solid var(--brand-border);
  transition: var(--transition);
  cursor: pointer;
}
.video-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-hover);
  border-color: var(--brand-accent);
}
.video-thumb {
  position: relative; overflow: hidden;
  aspect-ratio: 16/9;
}
.video-thumb img {
  width: 100%; height: 100%; object-fit: cover;
  transition: transform 0.4s ease;
}
.video-card:hover .video-thumb img { transform: scale(1.08); }
.play-btn {
  position: absolute; inset: 0;
  display: flex; align-items: center; justify-content: center;
  background: rgba(0,0,0,0.3);
  opacity: 0; transition: var(--transition);
}
.video-card:hover .play-btn { opacity: 1; }
.play-icon {
  width: 56px; height: 56px; border-radius: 50%;
  background: rgba(240,90,26,0.9);
  display: flex; align-items: center; justify-content: center;
  transform: scale(0.8); transition: var(--transition);
  box-shadow: 0 4px 20px rgba(240,90,26,0.5);
}
.video-card:hover .play-icon { transform: scale(1); }
.play-icon svg { width: 22px; height: 22px; fill: #fff; margin-left: 4px; }
.video-duration {
  position: absolute; bottom: 8px; right: 8px;
  background: rgba(0,0,0,0.75); color: #fff;
  padding: 2px 8px; border-radius: 4px; font-size: 0.78rem; font-weight: 600;
}
.video-tag {
  position: absolute; top: 8px; left: 8px;
  background: var(--brand-accent); color: #fff;
  padding: 2px 10px; border-radius: 4px; font-size: 0.75rem; font-weight: 700;
}
.video-info { padding: 16px; }
.video-title {
  font-size: 0.95rem; font-weight: 700; color: var(--brand-white);
  margin-bottom: 8px; line-height: 1.4;
  display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical;
  overflow: hidden;
}
.video-meta {
  display: flex; align-items: center; gap: 12px;
  font-size: 0.78rem; color: var(--brand-gray);
}
.video-meta span { display: flex; align-items: center; gap: 4px; }
.video-meta svg { width: 13px; height: 13px; fill: currentColor; }
.video-author {
  display: flex; align-items: center; gap: 8px;
  margin-top: 10px; padding-top: 10px;
  border-top: 1px solid var(--brand-border);
}
.author-avatar {
  width: 28px; height: 28px; border-radius: 50%;
  object-fit: cover; border: 1.5px solid var(--brand-accent);
}
.author-name { font-size: 0.8rem; color: var(--brand-gray); }
.author-name strong { color: var(--brand-accent); font-size: 0.82rem; }

/* ---------- 特色模块卡片 ---------- */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 20px;
}
.feature-card {
  background: var(--brand-mid);
  border: 1px solid var(--brand-border);
  border-radius: var(--radius-md);
  padding: 28px 22px;
  text-align: center;
  transition: var(--transition);
  position: relative; overflow: hidden;
}
.feature-card::before {
  content: ''; position: absolute; top: 0; left: 0; right: 0;
  height: 3px; background: linear-gradient(90deg, var(--brand-accent), var(--brand-accent2));
  transform: scaleX(0); transition: var(--transition);
}
.feature-card:hover::before { transform: scaleX(1); }
.feature-card:hover {
  transform: translateY(-4px); box-shadow: var(--shadow-hover);
  border-color: var(--brand-accent);
}
.feature-icon {
  width: 60px; height: 60px; border-radius: 50%;
  background: linear-gradient(135deg, var(--brand-accent), #d94a0a);
  display: flex; align-items: center; justify-content: center;
  margin: 0 auto 16px; font-size: 1.6rem;
}
.feature-card h3 {
  font-size: 1rem; font-weight: 800; color: var(--brand-white);
  margin-bottom: 8px;
}
.feature-card p { font-size: 0.85rem; color: var(--brand-gray); line-height: 1.6; }

/* ---------- AI 赋能区块 ---------- */
.ai-section {
  background: linear-gradient(135deg, var(--brand-dark) 0%, var(--brand-mid) 100%);
  position: relative; overflow: hidden;
}
.ai-section::before {
  content: ''; position: absolute; top: -50%; right: -20%;
  width: 600px; height: 600px; border-radius: 50%;
  background: radial-gradient(circle, rgba(240,90,26,0.08) 0%, transparent 70%);
}
.ai-grid {
  display: grid; grid-template-columns: 1fr 1fr; gap: 48px; align-items: center;
}
.ai-image-wrap { border-radius: var(--radius-lg); overflow: hidden; position: relative; }
.ai-image-wrap img { width: 100%; border-radius: var(--radius-lg); }
.ai-badge {
  position: absolute; top: 20px; left: 20px;
  background: rgba(240,90,26,0.9); color: #fff;
  padding: 6px 14px; border-radius: 20px; font-size: 0.8rem; font-weight: 700;
}
.ai-features { display: flex; flex-direction: column; gap: 20px; }
.ai-feature-item {
  display: flex; gap: 16px; align-items: flex-start;
  background: rgba(255,255,255,0.04); border: 1px solid var(--brand-border);
  border-radius: var(--radius-md); padding: 18px;
  transition: var(--transition);
}
.ai-feature-item:hover { border-color: var(--brand-accent); background: rgba(240,90,26,0.06); }
.ai-feature-icon {
  width: 44px; height: 44px; border-radius: 10px; flex-shrink: 0;
  background: linear-gradient(135deg, var(--brand-accent), #d94a0a);
  display: flex; align-items: center; justify-content: center; font-size: 1.2rem;
}
.ai-feature-text h4 { font-size: 0.95rem; font-weight: 700; color: var(--brand-white); margin-bottom: 4px; }
.ai-feature-text p { font-size: 0.83rem; color: var(--brand-gray); line-height: 1.5; }

/* ---------- 专家团队 ---------- */
.expert-grid {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); gap: 24px;
}
.expert-card {
  background: var(--brand-mid); border: 1px solid var(--brand-border);
  border-radius: var(--radius-md); overflow: hidden; transition: var(--transition);
  text-align: center;
}
.expert-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-hover); border-color: var(--brand-accent); }
.expert-photo { position: relative; overflow: hidden; }
.expert-photo img { width: 100%; aspect-ratio: 1/1; object-fit: cover; transition: transform 0.4s; }
.expert-card:hover .expert-photo img { transform: scale(1.05); }
.expert-overlay {
  position: absolute; inset: 0; background: rgba(240,90,26,0.85);
  display: flex; align-items: center; justify-content: center; gap: 12px;
  opacity: 0; transition: var(--transition);
}
.expert-card:hover .expert-overlay { opacity: 1; }
.expert-overlay a {
  background: #fff; color: var(--brand-accent);
  padding: 8px 14px; border-radius: 20px; font-size: 0.8rem; font-weight: 700;
}
.expert-info { padding: 18px; }
.expert-info h3 { font-size: 1.05rem; font-weight: 800; color: var(--brand-white); margin-bottom: 4px; }
.expert-role { font-size: 0.82rem; color: var(--brand-accent); font-weight: 600; margin-bottom: 8px; }
.expert-desc { font-size: 0.8rem; color: var(--brand-gray); line-height: 1.5; margin-bottom: 12px; }
.expert-stats { display: flex; justify-content: center; gap: 20px; }
.expert-stat { text-align: center; }
.expert-stat .n { font-size: 1rem; font-weight: 800; color: var(--brand-accent); }
.expert-stat .l { font-size: 0.72rem; color: var(--brand-gray); }

/* ---------- 合作品牌 ---------- */
.partners-wrap {
  overflow: hidden; position: relative;
}
.partners-track {
  display: flex; gap: 32px; align-items: center;
  animation: scroll 20s linear infinite;
  width: max-content;
}
.partners-track:hover { animation-play-state: paused; }
@keyframes scroll { from{transform:translateX(0)} to{transform:translateX(-50%)} }
.partner-logo {
  background: var(--brand-mid); border: 1px solid var(--brand-border);
  border-radius: var(--radius-sm); padding: 14px 28px;
  color: var(--brand-gray); font-weight: 800; font-size: 0.9rem;
  white-space: nowrap; transition: var(--transition);
}
.partner-logo:hover { border-color: var(--brand-accent); color: var(--brand-accent); }

/* ---------- FAQ ---------- */
.faq-list { max-width: 820px; margin: 0 auto; display: flex; flex-direction: column; gap: 12px; }
.faq-item {
  background: var(--brand-mid); border: 1px solid var(--brand-border);
  border-radius: var(--radius-md); overflow: hidden; transition: var(--transition);
}
.faq-item.open { border-color: var(--brand-accent); }
.faq-question {
  display: flex; align-items: center; justify-content: space-between;
  padding: 18px 22px; cursor: pointer;
  font-size: 0.95rem; font-weight: 700; color: var(--brand-white);
  transition: var(--transition);
}
.faq-question:hover { color: var(--brand-accent); }
.faq-icon {
  width: 24px; height: 24px; border-radius: 50%;
  background: rgba(240,90,26,0.15); color: var(--brand-accent);
  display: flex; align-items: center; justify-content: center;
  font-size: 1.1rem; flex-shrink: 0; transition: var(--transition);
}
.faq-item.open .faq-icon { transform: rotate(45deg); background: var(--brand-accent); color: #fff; }
.faq-answer {
  max-height: 0; overflow: hidden; transition: max-height 0.35s ease, padding 0.35s ease;
  padding: 0 22px; color: var(--brand-gray); font-size: 0.88rem; line-height: 1.7;
}
.faq-item.open .faq-answer { max-height: 200px; padding: 0 22px 18px; }

/* ---------- 用户评价 ---------- */
.reviews-grid {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 20px;
}
.review-card {
  background: var(--brand-mid); border: 1px solid var(--brand-border);
  border-radius: var(--radius-md); padding: 22px;
  transition: var(--transition);
}
.review-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-card); border-color: var(--brand-accent); }
.review-stars { color: var(--brand-accent2); font-size: 1rem; margin-bottom: 10px; letter-spacing: 2px; }
.review-text { font-size: 0.88rem; color: var(--brand-light); line-height: 1.7; margin-bottom: 14px; font-style: italic; }
.review-user { display: flex; align-items: center; gap: 10px; }
.review-avatar {
  width: 38px; height: 38px; border-radius: 50%;
  background: linear-gradient(135deg, var(--brand-accent), var(--brand-accent2));
  display: flex; align-items: center; justify-content: center;
  font-size: 1rem; font-weight: 800; color: #fff; flex-shrink: 0;
}
.review-name { font-size: 0.88rem; font-weight: 700; color: var(--brand-white); }
.review-label { font-size: 0.75rem; color: var(--brand-gray); }
.review-meta { margin-left: auto; font-size: 0.75rem; color: var(--brand-gray); }

/* ---------- 联系 & 二维码 ---------- */
.contact-grid {
  display: grid; grid-template-columns: 1fr 1fr; gap: 40px; align-items: start;
}
.contact-info h3 { font-size: 1.3rem; font-weight: 800; color: var(--brand-white); margin-bottom: 20px; }
.contact-item {
  display: flex; gap: 14px; align-items: flex-start;
  margin-bottom: 16px;
}
.contact-icon {
  width: 40px; height: 40px; border-radius: 10px; flex-shrink: 0;
  background: rgba(240,90,26,0.15); color: var(--brand-accent);
  display: flex; align-items: center; justify-content: center; font-size: 1.1rem;
}
.contact-item h4 { font-size: 0.88rem; font-weight: 700; color: var(--brand-white); margin-bottom: 2px; }
.contact-item p { font-size: 0.82rem; color: var(--brand-gray); }
.qr-row { display: flex; gap: 24px; flex-wrap: wrap; }
.qr-box { text-align: center; }
.qr-code {
  width: 120px; height: 120px; border-radius: var(--radius-sm);
  border: 2px solid var(--brand-border); background: #fff;
  display: flex; align-items: center; justify-content: center;
  margin: 0 auto 8px;
  overflow: hidden;
}
.qr-code canvas { width: 100% !important; height: 100% !important; }
.qr-label { font-size: 0.78rem; color: var(--brand-gray); }

/* ---------- 社交分享 ---------- */
.share-bar {
  background: var(--brand-mid); border-top: 1px solid var(--brand-border);
  padding: 16px 0;
}
.share-inner {
  max-width: 1200px; margin: 0 auto; padding: 0 20px;
  display: flex; align-items: center; gap: 16px; flex-wrap: wrap;
}
.share-label { font-size: 0.85rem; color: var(--brand-gray); font-weight: 600; }
.share-btns { display: flex; gap: 10px; flex-wrap: wrap; }
.share-btn {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 7px 16px; border-radius: 20px; font-size: 0.8rem; font-weight: 700;
  transition: var(--transition); cursor: pointer;
}
.share-wechat { background: rgba(9,187,7,0.15); color: #09bb07; border: 1px solid rgba(9,187,7,0.3); }
.share-wechat:hover { background: #09bb07; color: #fff; }
.share-weibo { background: rgba(230,22,45,0.15); color: #e6162d; border: 1px solid rgba(230,22,45,0.3); }
.share-weibo:hover { background: #e6162d; color: #fff; }
.share-douyin { background: rgba(0,0,0,0.3); color: #fff; border: 1px solid #333; }
.share-douyin:hover { background: #000; }
.share-bilibili { background: rgba(0,161,214,0.15); color: #00a1d6; border: 1px solid rgba(0,161,214,0.3); }
.share-bilibili:hover { background: #00a1d6; color: #fff; }

/* ---------- 页脚 ---------- */
.footer {
  background: var(--brand-dark);
  border-top: 1px solid var(--brand-border);
  padding: 60px 0 0;
}
.footer-grid {
  display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 40px;
  max-width: 1200px; margin: 0 auto; padding: 0 20px 40px;
}
.footer-brand .footer-logo {
  display: flex; align-items: center; gap: 10px; margin-bottom: 16px;
}
.footer-logo img { width: 40px; height: 40px; border-radius: 50%; }
.footer-logo span { font-size: 1.2rem; font-weight: 900; color: var(--brand-white); }
.footer-brand p { font-size: 0.85rem; color: var(--brand-gray); line-height: 1.7; margin-bottom: 20px; }
.footer-social { display: flex; gap: 10px; }
.social-btn {
  width: 36px; height: 36px; border-radius: 50%;
  background: var(--brand-mid); border: 1px solid var(--brand-border);
  display: flex; align-items: center; justify-content: center;
  color: var(--brand-gray); font-size: 0.9rem; transition: var(--transition);
}
.social-btn:hover { background: var(--brand-accent); color: #fff; border-color: var(--brand-accent); }
.footer-col h4 {
  font-size: 0.95rem; font-weight: 800; color: var(--brand-white);
  margin-bottom: 16px; padding-bottom: 10px;
  border-bottom: 2px solid var(--brand-accent);
  display: inline-block;
}
.footer-col ul li { margin-bottom: 8px; }
.footer-col ul li a { font-size: 0.85rem; color: var(--brand-gray); transition: var(--transition); }
.footer-col ul li a:hover { color: var(--brand-accent); padding-left: 4px; }
.footer-bottom {
  background: rgba(0,0,0,0.3); padding: 16px 20px;
  max-width: 100%; border-top: 1px solid var(--brand-border);
}
.footer-bottom-inner {
  max-width: 1200px; margin: 0 auto;
  display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 10px;
}
.footer-bottom p { font-size: 0.8rem; color: var(--brand-gray); }
.footer-bottom a { color: var(--brand-gray); }
.footer-bottom a:hover { color: var(--brand-accent); }
.update-time { font-size: 0.78rem; color: var(--brand-gray); }
.update-time strong { color: var(--brand-accent); }

/* ---------- 面包屑 ---------- */
.breadcrumb {
  padding: 14px 0; background: var(--brand-mid);
  border-bottom: 1px solid var(--brand-border);
}
.breadcrumb-inner {
  max-width: 1200px; margin: 0 auto; padding: 0 20px;
  display: flex; align-items: center; gap: 8px;
  font-size: 0.82rem; color: var(--brand-gray);
}
.breadcrumb-inner a { color: var(--brand-gray); }
.breadcrumb-inner a:hover { color: var(--brand-accent); }
.breadcrumb-inner span { color: var(--brand-accent); font-weight: 600; }
.breadcrumb-sep { color: var(--brand-border); }

/* ---------- 标签页 ---------- */
.tab-nav {
  display: flex; gap: 4px; flex-wrap: wrap;
  border-bottom: 2px solid var(--brand-border); margin-bottom: 32px;
}
.tab-btn {
  padding: 10px 20px; background: none;
  color: var(--brand-gray); font-size: 0.9rem; font-weight: 600;
  border-bottom: 2px solid transparent; margin-bottom: -2px;
  transition: var(--transition);
}
.tab-btn.active, .tab-btn:hover { color: var(--brand-accent); border-bottom-color: var(--brand-accent); }
.tab-panel { display: none; }
.tab-panel.active { display: block; }

/* ---------- 加入社区 ---------- */
.join-section {
  background: linear-gradient(135deg, var(--brand-accent) 0%, #c94010 50%, var(--brand-primary) 100%);
  text-align: center; padding: 70px 20px;
}
.join-section h2 { font-size: 2.2rem; font-weight: 900; color: #fff; margin-bottom: 14px; }
.join-section p { font-size: 1.05rem; color: rgba(255,255,255,0.85); margin-bottom: 32px; }
.join-steps {
  display: flex; justify-content: center; gap: 40px; flex-wrap: wrap; margin-bottom: 36px;
}
.join-step { text-align: center; color: #fff; }
.join-step .step-num {
  width: 48px; height: 48px; border-radius: 50%;
  background: rgba(255,255,255,0.2); border: 2px solid rgba(255,255,255,0.5);
  display: flex; align-items: center; justify-content: center;
  font-size: 1.2rem; font-weight: 900; margin: 0 auto 10px;
}
.join-step p { font-size: 0.85rem; color: rgba(255,255,255,0.85); }

/* ---------- 数据统计条 ---------- */
.stats-bar {
  background: var(--brand-mid); border-top: 1px solid var(--brand-border);
  border-bottom: 1px solid var(--brand-border); padding: 28px 0;
}
.stats-inner {
  max-width: 1200px; margin: 0 auto; padding: 0 20px;
  display: flex; justify-content: space-around; flex-wrap: wrap; gap: 20px;
}
.stat-item { text-align: center; }
.stat-item .big-num {
  font-size: 2.2rem; font-weight: 900; color: var(--brand-accent);
  display: block; line-height: 1;
}
.stat-item .stat-label { font-size: 0.82rem; color: var(--brand-gray); margin-top: 4px; }

/* ---------- 响应式 ---------- */
@media (max-width: 1024px) {
  .ai-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .contact-grid { grid-template-columns: 1fr; }
}
@media (max-width: 768px) {
  .navbar-nav { display: none; }
  .hamburger { display: flex; }
  .hero { min-height: 70vh; }
  .hero h1 { font-size: 1.8rem; }
  .hero-stats { gap: 20px; }
  .section-title { font-size: 1.5rem; }
  .video-grid { grid-template-columns: 1fr 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
  .join-steps { gap: 20px; }
  .footer-bottom-inner { flex-direction: column; text-align: center; }
}
@media (max-width: 480px) {
  .video-grid { grid-template-columns: 1fr; }
  .hero-actions { flex-direction: column; }
  .hero-actions .btn-primary, .hero-actions .btn-outline { width: 100%; justify-content: center; }
  .qr-row { justify-content: center; }
}

/* ---------- 滚动条 ---------- */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--brand-dark); }
::-webkit-scrollbar-thumb { background: var(--brand-accent); border-radius: 3px; }

/* ---------- 选中颜色 ---------- */
::selection { background: rgba(240,90,26,0.35); color: #fff; }

/* ---------- 加载动画 ---------- */
.fade-in { opacity: 0; transform: translateY(20px); transition: opacity 0.6s ease, transform 0.6s ease; }
.fade-in.visible { opacity: 1; transform: translateY(0); }

/* ---------- 标签云 ---------- */
.tag-cloud { display: flex; flex-wrap: wrap; gap: 8px; }
.tag-item {
  background: rgba(240,90,26,0.1); color: var(--brand-accent);
  border: 1px solid rgba(240,90,26,0.25); padding: 4px 12px;
  border-radius: 20px; font-size: 0.8rem; cursor: pointer; transition: var(--transition);
}
.tag-item:hover { background: var(--brand-accent); color: #fff; }

/* ---------- 视频播放模态框 ---------- */
.video-modal {
  display: none; position: fixed; inset: 0; z-index: 9999;
  background: rgba(0,0,0,0.92); align-items: center; justify-content: center;
}
.video-modal.open { display: flex; }
.modal-content {
  position: relative; width: 90%; max-width: 900px;
  background: var(--brand-dark); border-radius: var(--radius-lg);
  overflow: hidden; box-shadow: 0 20px 80px rgba(0,0,0,0.8);
}
.modal-close {
  position: absolute; top: 12px; right: 16px; z-index: 10;
  background: rgba(0,0,0,0.5); color: #fff; width: 36px; height: 36px;
  border-radius: 50%; font-size: 1.2rem; display: flex; align-items: center; justify-content: center;
  transition: var(--transition);
}
.modal-close:hover { background: var(--brand-accent); }
.modal-video-wrap { aspect-ratio: 16/9; background: #000; }
.modal-video-wrap video { width: 100%; height: 100%; }
.modal-info { padding: 20px; }
.modal-info h3 { font-size: 1.1rem; font-weight: 800; color: var(--brand-white); margin-bottom: 8px; }
.modal-info p { font-size: 0.85rem; color: var(--brand-gray); }

/* ---------- 团队卡片 ---------- */
.team-grid {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: 28px;
}
.team-card {
  background: var(--brand-mid); border: 1px solid var(--brand-border);
  border-radius: var(--radius-lg); overflow: hidden; transition: var(--transition);
  display: flex; flex-direction: column;
}
.team-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-hover); border-color: var(--brand-accent); }
.team-avatar-wrap { position: relative; }
.team-avatar {
  width: 100%; aspect-ratio: 4/3; object-fit: cover;
  transition: transform 0.4s ease;
}
.team-card:hover .team-avatar { transform: scale(1.05); }
.team-exp {
  position: absolute; bottom: 10px; right: 10px;
  background: rgba(240,90,26,0.9); color: #fff;
  padding: 4px 12px; border-radius: 20px; font-size: 0.75rem; font-weight: 700;
}
.team-info { padding: 20px; flex: 1; }
.team-name { font-size: 1.1rem; font-weight: 900; color: var(--brand-white); margin-bottom: 4px; }
.team-role { font-size: 0.82rem; color: var(--brand-accent); font-weight: 700; margin-bottom: 10px; }
.team-desc { font-size: 0.82rem; color: var(--brand-gray); line-height: 1.6; margin-bottom: 14px; }
.team-tags { display: flex; flex-wrap: wrap; gap: 6px; }
.team-tag {
  background: rgba(240,90,26,0.12); color: var(--brand-accent);
  border: 1px solid rgba(240,90,26,0.25); padding: 3px 10px;
  border-radius: 20px; font-size: 0.75rem; font-weight: 600;
}

/* ---------- 联系表单 ---------- */
.contact-form { display: flex; flex-direction: column; gap: 16px; }
.form-group { display: flex; flex-direction: column; gap: 6px; }
.form-group label { font-size: 0.88rem; font-weight: 600; color: var(--brand-white); }
.form-group input,
.form-group select,
.form-group textarea {
  background: var(--brand-mid); border: 1.5px solid var(--brand-border);
  border-radius: var(--radius-sm); color: var(--brand-white);
  padding: 11px 14px; font-size: 0.9rem; font-family: var(--font-main);
  outline: none; transition: var(--transition);
}
.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  border-color: var(--brand-accent);
  box-shadow: 0 0 0 3px rgba(240,90,26,0.15);
}
.form-group input::placeholder,
.form-group textarea::placeholder { color: var(--brand-gray); }
.form-group select option { background: var(--brand-dark); }
.form-group textarea { resize: vertical; min-height: 120px; }

/* ---------- 联系信息列表 ---------- */
.contact-info-list { display: flex; flex-direction: column; gap: 16px; margin-bottom: 24px; }
.contact-info-item {
  display: flex; gap: 14px; align-items: flex-start;
  background: var(--brand-mid); border: 1px solid var(--brand-border);
  border-radius: var(--radius-md); padding: 16px;
  transition: var(--transition);
}
.contact-info-item:hover { border-color: var(--brand-accent); }
.contact-info-item .contact-icon {
  width: 40px; height: 40px; border-radius: 10px; flex-shrink: 0;
  background: rgba(240,90,26,0.15); color: var(--brand-accent);
  display: flex; align-items: center; justify-content: center; font-size: 1.1rem;
}

/* ---------- 视频模态框补充 ---------- */
.tab-container { margin-top: 0; }

/* ---------- 响应式补充 ---------- */
@media (max-width: 768px) {
  .team-grid { grid-template-columns: 1fr; }
  .contact-grid { grid-template-columns: 1fr; }
  .ai-grid { grid-template-columns: 1fr; }
  .tab-nav { gap: 2px; }
  .tab-btn { padding: 8px 12px; font-size: 0.82rem; }
}