/* ============================================
   糖心Vlog 官网主样式
   暗黑潮流·霓虹金紫渐变·赛博科技风格
   ============================================ */

/* ---- CSS变量 ---- */
:root {
  --bg-primary: #0a0a0f;
  --bg-secondary: #0f0f1a;
  --bg-card: #12121e;
  --bg-card-hover: #1a1a2e;
  --neon-purple: #a020f0;
  --neon-gold: #f0c040;
  --neon-blue: #00c8ff;
  --neon-pink: #ff2080;
  --gradient-gold-purple: linear-gradient(135deg, #f0c040 0%, #a020f0 100%);
  --gradient-purple-blue: linear-gradient(135deg, #a020f0 0%, #00c8ff 100%);
  --gradient-dark: linear-gradient(180deg, #0a0a0f 0%, #0f0f1a 100%);
  --text-primary: #f0f0f8;
  --text-secondary: #b0b0c8;
  --text-muted: #6060a0;
  --border-color: rgba(160, 32, 240, 0.2);
  --radius: 12px;
  --radius-lg: 20px;
  --shadow-neon: 0 0 20px rgba(160, 32, 240, 0.3);
  --shadow-gold: 0 0 20px rgba(240, 192, 64, 0.3);
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --font-main: 'PingFang SC', 'Microsoft YaHei', 'Hiragino Sans GB', sans-serif;
}

/* ---- 重置 ---- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; }
body {
  background: var(--bg-primary);
  color: var(--text-primary);
  font-family: var(--font-main);
  line-height: 1.6;
  overflow-x: hidden;
  min-height: 100vh;
}
a { color: var(--neon-gold); text-decoration: none; transition: var(--transition); }
a:hover { color: var(--neon-purple); }
img { max-width: 100%; height: auto; display: block; }
ul { list-style: none; }
button { cursor: pointer; font-family: var(--font-main); border: none; outline: none; }

/* ---- 粒子画布 ---- */
#particles-canvas {
  position: fixed;
  top: 0; left: 0;
  width: 100%; height: 100%;
  pointer-events: none;
  z-index: 0;
  opacity: 0.6;
}

/* ---- 导航 ---- */
.navbar {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 40px;
  height: 70px;
  background: rgba(10, 10, 15, 0.92);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-color);
}
.nav-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.3rem;
  font-weight: 900;
  background: var(--gradient-gold-purple);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  letter-spacing: 1px;
}
.nav-logo-icon {
  width: 36px; height: 36px;
  background: var(--gradient-gold-purple);
  border-radius: 10px;
  display: flex; align-items: center; justify-content: center;
  font-size: 1rem; font-weight: 900;
  color: #fff;
  -webkit-text-fill-color: #fff;
  flex-shrink: 0;
}
.nav-menu {
  display: flex;
  align-items: center;
  gap: 4px;
}
.nav-menu a {
  padding: 8px 14px;
  border-radius: 8px;
  font-size: 0.88rem;
  color: var(--text-secondary);
  transition: var(--transition);
  white-space: nowrap;
}
.nav-menu a:hover, .nav-menu a.active {
  color: var(--neon-gold);
  background: rgba(240, 192, 64, 0.1);
}
.nav-menu a.nav-cta {
  background: var(--gradient-gold-purple);
  color: #fff !important;
  -webkit-text-fill-color: #fff;
  padding: 8px 18px;
  border-radius: 20px;
  font-weight: 600;
}
.nav-menu a.nav-cta:hover {
  opacity: 0.85;
  background: var(--gradient-gold-purple);
}
.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 6px;
}
.hamburger span {
  display: block;
  width: 24px; height: 2px;
  background: var(--neon-gold);
  border-radius: 2px;
  transition: var(--transition);
}
.hamburger.active span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.hamburger.active span:nth-child(2) { opacity: 0; }
.hamburger.active span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ---- 搜索栏 ---- */
.search-bar {
  position: sticky;
  top: 70px;
  z-index: 900;
  background: rgba(10, 10, 15, 0.95);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-color);
  padding: 12px 40px;
  display: flex;
  justify-content: center;
}
.search-inner {
  display: flex;
  align-items: center;
  gap: 10px;
  background: rgba(255,255,255,0.04);
  border: 1px solid var(--border-color);
  border-radius: 30px;
  padding: 10px 18px;
  width: 100%;
  transition: var(--transition);
}
.search-inner:focus-within {
  border-color: var(--neon-gold);
  box-shadow: 0 0 0 3px rgba(240,192,64,0.1);
}
.search-inner input {
  flex: 1;
  background: transparent;
  border: none;
  outline: none;
  color: var(--text-primary);
  font-size: 0.9rem;
  font-family: var(--font-main);
}
.search-inner input::placeholder { color: var(--text-muted); }
.search-btn {
  background: var(--gradient-gold-purple);
  color: #fff;
  border: none;
  border-radius: 20px;
  padding: 7px 20px;
  font-size: 0.85rem;
  font-weight: 600;
  white-space: nowrap;
  transition: var(--transition);
}
.search-btn:hover { opacity: 0.85; transform: scale(1.03); }
.search-tags {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-top: 8px;
  padding: 0 4px;
}
.search-tag {
  font-size: 0.75rem;
  color: var(--text-muted);
  background: rgba(160,32,240,0.08);
  border: 1px solid rgba(160,32,240,0.15);
  border-radius: 12px;
  padding: 3px 10px;
  cursor: pointer;
  transition: var(--transition);
}
.search-tag:hover {
  color: var(--neon-gold);
  border-color: var(--neon-gold);
  background: rgba(240,192,64,0.08);
}

/* ---- 主内容 ---- */
.main-content {
  position: relative;
  z-index: 1;
  padding-top: 0;
}

/* ---- Hero Section ---- */
.hero-section {
  position: relative;
  min-height: calc(100vh - 120px);
  display: flex;
  align-items: center;
  overflow: hidden;
  padding: 80px 40px;
}
.hero-bg {
  position: absolute;
  inset: 0;
  background: url('/images/banner.jpg') center/cover no-repeat;
  opacity: 0.25;
  filter: blur(2px);
}
.hero-glow {
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse at 30% 50%, rgba(160,32,240,0.2) 0%, transparent 60%),
              radial-gradient(ellipse at 70% 30%, rgba(240,192,64,0.15) 0%, transparent 50%);
}
.hero-content {
  position: relative;
  z-index: 2;
  max-width: 800px;
  margin: 0 auto;
  text-align: center;
}
.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(255,32,80,0.15);
  border: 1px solid rgba(255,32,80,0.3);
  border-radius: 20px;
  padding: 6px 16px;
  font-size: 0.82rem;
  color: #ff6090;
  margin-bottom: 24px;
  animation: pulse 2s infinite;
}
@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.7; }
}
.hero-title {
  font-size: clamp(2.2rem, 5vw, 4rem);
  font-weight: 900;
  line-height: 1.15;
  margin-bottom: 20px;
}
.hero-title .brand {
  display: block;
  background: var(--gradient-gold-purple);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  text-shadow: none;
}
.hero-title .sub {
  display: block;
  font-size: 0.45em;
  color: var(--text-secondary);
  font-weight: 400;
  margin-top: 8px;
  -webkit-text-fill-color: var(--text-secondary);
}
.hero-desc {
  font-size: 1.05rem;
  color: var(--text-secondary);
  margin-bottom: 32px;
  line-height: 1.8;
}
.hero-desc strong { color: var(--neon-gold); }
.hero-buttons {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: 48px;
}
.btn-primary {
  background: var(--gradient-gold-purple);
  color: #fff;
  border: none;
  border-radius: 30px;
  padding: 14px 32px;
  font-size: 1rem;
  font-weight: 700;
  transition: var(--transition);
  box-shadow: 0 4px 20px rgba(160,32,240,0.3);
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(160,32,240,0.5);
}
.btn-secondary {
  background: transparent;
  color: var(--neon-gold);
  border: 2px solid var(--neon-gold);
  border-radius: 30px;
  padding: 12px 30px;
  font-size: 1rem;
  font-weight: 700;
  transition: var(--transition);
}
.btn-secondary:hover {
  background: rgba(240,192,64,0.1);
  transform: translateY(-2px);
  box-shadow: var(--shadow-gold);
}
.hero-stats {
  display: flex;
  gap: 32px;
  justify-content: center;
  flex-wrap: wrap;
}
.hero-stat .num {
  font-size: 1.5rem;
  font-weight: 900;
  background: var(--gradient-gold-purple);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.hero-stat .label {
  font-size: 0.78rem;
  color: var(--text-muted);
  margin-top: 4px;
}

/* ---- Section ---- */
.section {
  padding: 80px 40px;
  max-width: 1200px;
  margin: 0 auto;
}
.section-alt {
  background: linear-gradient(180deg, transparent, rgba(160,32,240,0.03), transparent);
}
.section-header {
  text-align: center;
  margin-bottom: 48px;
}
.section-tag {
  display: inline-block;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 3px;
  color: var(--neon-purple);
  margin-bottom: 12px;
  text-transform: uppercase;
}
.section-title {
  font-size: clamp(1.6rem, 3vw, 2.4rem);
  font-weight: 900;
  margin-bottom: 16px;
  line-height: 1.2;
}
.section-title .highlight {
  background: var(--gradient-gold-purple);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.section-desc {
  font-size: 0.95rem;
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto;
  line-height: 1.7;
}

/* ---- 视频卡片 ---- */
.video-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 24px;
}
.video-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: var(--transition);
  cursor: pointer;
}
.video-card:hover {
  transform: translateY(-6px);
  border-color: var(--neon-gold);
  box-shadow: 0 12px 40px rgba(240,192,64,0.15);
}
.video-thumb {
  position: relative;
  aspect-ratio: 16/9;
  overflow: hidden;
  background: var(--bg-secondary);
}
.video-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.4s ease;
}
.video-card:hover .video-thumb img {
  transform: scale(1.06);
}
.video-play-btn {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(0,0,0,0.4);
  opacity: 0;
  transition: var(--transition);
}
.video-card:hover .video-play-btn {
  opacity: 1;
}
.play-icon {
  width: 56px; height: 56px;
  background: var(--gradient-gold-purple);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.3rem;
  color: #fff;
  box-shadow: 0 4px 20px rgba(160,32,240,0.5);
  transform: scale(0.8);
  transition: var(--transition);
}
.video-card:hover .play-icon {
  transform: scale(1);
}
.video-tag {
  position: absolute;
  top: 10px; left: 10px;
  background: var(--gradient-gold-purple);
  color: #fff;
  font-size: 0.72rem;
  font-weight: 600;
  padding: 3px 10px;
  border-radius: 10px;
}
.video-duration {
  position: absolute;
  bottom: 10px; right: 10px;
  background: rgba(0,0,0,0.7);
  color: #fff;
  font-size: 0.72rem;
  padding: 2px 8px;
  border-radius: 6px;
}
.video-info {
  padding: 16px;
}
.video-title {
  font-size: 0.88rem;
  font-weight: 600;
  line-height: 1.5;
  margin-bottom: 10px;
  color: var(--text-primary);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.video-meta {
  display: flex;
  gap: 12px;
  font-size: 0.75rem;
  color: var(--text-muted);
}
.video-meta .icon { margin-right: 3px; }

/* ---- 社区卡片 ---- */
.community-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 24px;
}
.community-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 24px;
  transition: var(--transition);
}
.community-card:hover {
  border-color: var(--neon-purple);
  box-shadow: var(--shadow-neon);
  transform: translateY(-4px);
}
.topic-tag {
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--neon-gold);
  margin-bottom: 10px;
}
.topic-desc {
  font-size: 0.85rem;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 12px;
}
.topic-hot {
  font-size: 0.8rem;
  color: var(--neon-pink);
  margin-bottom: 14px;
}
/* 弹幕 */
.danmu-container {
  overflow: hidden;
  height: 28px;
  position: relative;
  border-radius: 6px;
  background: rgba(255,255,255,0.03);
}
.danmu-track {
  display: flex;
  gap: 40px;
  white-space: nowrap;
  animation: danmu-scroll 18s linear infinite;
  padding: 4px 0;
}
.danmu-item {
  font-size: 0.78rem;
  color: var(--text-muted);
  flex-shrink: 0;
}
@keyframes danmu-scroll {
  0% { transform: translateX(100%); }
  100% { transform: translateX(-100%); }
}

/* ---- AI工具卡片 ---- */
.ai-tools-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 20px;
}
.ai-tool-card {
  background: var(--bg-card);
  border: 1px solid rgba(0,200,255,0.15);
  border-radius: var(--radius-lg);
  padding: 28px 20px;
  text-align: center;
  transition: var(--transition);
}
.ai-tool-card:hover {
  border-color: var(--neon-blue);
  box-shadow: 0 0 20px rgba(0,200,255,0.2);
  transform: translateY(-4px);
}
.ai-tool-icon {
  font-size: 2.2rem;
  display: block;
  margin-bottom: 14px;
}
.ai-tool-name {
  font-size: 1rem;
  font-weight: 700;
  color: var(--neon-blue);
  margin-bottom: 10px;
}
.ai-tool-desc {
  font-size: 0.82rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* ---- 专家卡片 ---- */
.experts-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 24px;
}
.expert-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 32px 24px;
  text-align: center;
  transition: var(--transition);
}
.expert-card:hover {
  border-color: var(--neon-gold);
  box-shadow: var(--shadow-gold);
  transform: translateY(-4px);
}
.expert-avatar {
  width: 88px; height: 88px;
  border-radius: 50%;
  margin: 0 auto 16px;
  border: 3px solid transparent;
  background: var(--gradient-gold-purple) padding-box, var(--gradient-gold-purple) border-box;
  overflow: hidden;
}
.expert-avatar img {
  width: 100%; height: 100%;
  object-fit: cover;
}
.expert-name {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 6px;
}
.expert-title {
  font-size: 0.8rem;
  color: var(--neon-gold);
  margin-bottom: 12px;
}
.expert-desc {
  font-size: 0.82rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* ---- 评价卡片 ---- */
.reviews-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 20px;
}
.review-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 24px;
  transition: var(--transition);
}
.review-card:hover {
  border-color: var(--neon-purple);
  transform: translateY(-3px);
}
.review-stars {
  color: var(--neon-gold);
  font-size: 0.9rem;
  margin-bottom: 12px;
}
.review-content {
  font-size: 0.85rem;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 16px;
}
.review-user {
  display: flex;
  align-items: center;
  gap: 12px;
}
.review-avatar {
  width: 40px; height: 40px;
  border-radius: 50%;
  background: var(--gradient-gold-purple);
  display: flex; align-items: center; justify-content: center;
  font-size: 0.9rem; font-weight: 700; color: #fff;
  flex-shrink: 0;
}
.review-name { font-size: 0.85rem; font-weight: 600; }
.review-date { font-size: 0.75rem; color: var(--text-muted); }

/* ---- 合作伙伴 ---- */
.partners-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
  gap: 16px;
  margin-bottom: 48px;
}
.partner-item {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  padding: 20px 16px;
  text-align: center;
  font-size: 0.85rem;
  color: var(--text-secondary);
  transition: var(--transition);
}
.partner-item:hover {
  border-color: var(--neon-gold);
  color: var(--neon-gold);
}

/* ---- 加入指南 ---- */
.join-guide {
  background: linear-gradient(135deg, rgba(160,32,240,0.08), rgba(240,192,64,0.05));
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 40px;
  text-align: center;
}
.join-guide h3 {
  font-size: 1.4rem;
  font-weight: 700;
  margin-bottom: 12px;
  background: var(--gradient-gold-purple);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.join-guide p {
  font-size: 0.9rem;
  color: var(--text-secondary);
  margin-bottom: 28px;
}
.join-steps {
  display: flex;
  gap: 20px;
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: 28px;
}
.join-step {
  display: flex;
  align-items: center;
  gap: 10px;
}
.step-num {
  width: 36px; height: 36px;
  background: var(--gradient-gold-purple);
  border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  font-weight: 700; font-size: 0.9rem; color: #fff;
  flex-shrink: 0;
}
.step-text {
  font-size: 0.88rem;
  color: var(--text-secondary);
}
.domain-display {
  color: var(--neon-gold);
  font-weight: 600;
}

/* ---- FAQ ---- */
.faq-list {
  max-width: 800px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.faq-item {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  overflow: hidden;
  transition: var(--transition);
}
.faq-item.open {
  border-color: var(--neon-gold);
}
.faq-question {
  padding: 18px 20px;
  font-size: 0.92rem;
  font-weight: 600;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  transition: var(--transition);
}
.faq-question::after {
  content: '+';
  font-size: 1.2rem;
  color: var(--neon-gold);
  transition: var(--transition);
  flex-shrink: 0;
}
.faq-item.open .faq-question::after { content: '−'; }
.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease, padding 0.3s ease;
  font-size: 0.85rem;
  color: var(--text-secondary);
  line-height: 1.7;
  padding: 0 20px;
}
.faq-item.open .faq-answer {
  max-height: 200px;
  padding: 0 20px 18px;
}

/* ---- 联系页 ---- */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
  max-width: 900px;
  margin: 0 auto;
}
.contact-info h3 {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 24px;
  color: var(--neon-gold);
}
.contact-item {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  margin-bottom: 20px;
  padding: 16px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  transition: var(--transition);
}
.contact-item:hover { border-color: var(--neon-gold); }
.contact-icon { font-size: 1.3rem; flex-shrink: 0; margin-top: 2px; }
.contact-text .label { font-size: 0.75rem; color: var(--text-muted); margin-bottom: 4px; }
.contact-text .value { font-size: 0.88rem; color: var(--text-primary); font-weight: 500; }
.contact-qr {
  text-align: center;
  padding: 24px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
}
.contact-qr img {
  width: 140px; height: 140px;
  border-radius: 12px;
  border: 2px solid var(--neon-gold);
  margin: 0 auto 16px;
  object-fit: cover;
}
.contact-qr p {
  font-size: 0.82rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* ---- 内页Banner ---- */
.page-banner {
  position: relative;
  height: 280px;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
}
.page-banner-bg {
  position: absolute;
  inset: 0;
  background-size: cover;
  background-position: center;
  opacity: 0.3;
  filter: blur(3px);
}
.page-banner-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(10,10,15,0.3), rgba(10,10,15,0.7));
}
.page-banner-content {
  position: relative;
  z-index: 2;
  text-align: center;
}
.page-banner-content h1 {
  font-size: clamp(1.8rem, 4vw, 3rem);
  font-weight: 900;
  background: var(--gradient-gold-purple);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 10px;
}
.page-banner-content p {
  font-size: 0.95rem;
  color: var(--text-secondary);
}

/* ---- 面包屑 ---- */
.breadcrumb {
  padding: 12px 40px;
  font-size: 0.82rem;
  color: var(--text-muted);
  max-width: 1200px;
  margin: 0 auto;
}
.breadcrumb a {
  color: var(--text-muted);
}
.breadcrumb a:hover { color: var(--neon-gold); }

/* ---- 页脚 ---- */
.footer {
  background: var(--bg-secondary);
  border-top: 1px solid var(--border-color);
  position: relative;
  z-index: 1;
  margin-top: 60px;
}
.footer-top {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
  padding: 60px 40px 40px;
  max-width: 1200px;
  margin: 0 auto;
}
.footer-brand .logo {
  font-size: 1.5rem;
  font-weight: 900;
  background: var(--gradient-gold-purple);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 14px;
}
.footer-brand p {
  font-size: 0.82rem;
  color: var(--text-muted);
  line-height: 1.7;
  margin-bottom: 16px;
}
.footer-social {
  display: flex;
  gap: 10px;
}
.social-btn {
  width: 36px; height: 36px;
  background: rgba(160,32,240,0.15);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  display: flex; align-items: center; justify-content: center;
  font-size: 0.8rem; font-weight: 700; color: var(--text-secondary);
  cursor: pointer;
  transition: var(--transition);
}
.social-btn:hover {
  background: var(--gradient-gold-purple);
  color: #fff;
  border-color: transparent;
}
.footer-col h4 {
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--neon-gold);
  margin-bottom: 16px;
}
.footer-col ul li {
  margin-bottom: 8px;
}
.footer-col ul li a {
  font-size: 0.82rem;
  color: var(--text-muted);
  transition: var(--transition);
}
.footer-col ul li a:hover { color: var(--neon-gold); }
.footer-bottom {
  border-top: 1px solid var(--border-color);
  padding: 20px 40px;
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
}
.footer-copyright p {
  font-size: 0.78rem;
  color: var(--text-muted);
}
.footer-links {
  display: flex;
  gap: 16px;
}
.footer-links a {
  font-size: 0.78rem;
  color: var(--text-muted);
}
.footer-links a:hover { color: var(--neon-gold); }

/* ---- 滚动动画 ---- */
.animate-up {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
.animate-up.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ---- 响应式 ---- */
@media (max-width: 1024px) {
  .footer-top { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 768px) {
  .navbar { padding: 0 20px; }
  .nav-menu {
    display: none;
    position: fixed;
    top: 70px; left: 0; right: 0;
    background: rgba(10,10,15,0.98);
    backdrop-filter: blur(16px);
    flex-direction: column;
    padding: 20px;
    border-bottom: 1px solid var(--border-color);
    gap: 4px;
  }
  .nav-menu.open { display: flex; }
  .nav-menu a { width: 100%; padding: 12px 16px; }
  .hamburger { display: flex; }
  .search-bar { padding: 10px 16px; }
  .hero-section { padding: 60px 20px; min-height: auto; }
  .section { padding: 60px 20px; }
  .video-grid { grid-template-columns: repeat(auto-fill, minmax(200px, 1fr)); }
  .contact-grid { grid-template-columns: 1fr; }
  .footer-top { grid-template-columns: 1fr; gap: 24px; padding: 40px 20px 24px; }
  .footer-bottom { padding: 16px 20px; flex-direction: column; text-align: center; }
  .breadcrumb { padding: 12px 20px; }
  .page-banner { height: 200px; }
  .hero-stats { gap: 20px; }
  .join-steps { flex-direction: column; align-items: center; }
}
@media (max-width: 480px) {
  .hero-title { font-size: 1.8rem; }
  .hero-buttons { flex-direction: column; align-items: center; }
  .btn-primary, .btn-secondary { width: 100%; max-width: 280px; text-align: center; }
  .video-grid { grid-template-columns: 1fr; }
  .community-grid { grid-template-columns: 1fr; }
  .ai-tools-grid { grid-template-columns: 1fr 1fr; }
  .experts-grid { grid-template-columns: 1fr; }
  .reviews-grid { grid-template-columns: 1fr; }
}