/* ===== 91网 - 极简高端主样式 ===== */

/* === 变量定义 === */
:root {
  --color-bg: #ffffff;
  --color-bg-alt: #f8f9fb;
  --color-dark: #0a0e1a;
  --color-dark-2: #1a1f2e;
  --color-text: #2c2f3a;
  --color-text-light: #6b7280;
  --color-accent: #1a56db;
  --color-accent-light: #3b82f6;
  --color-border: #e5e7eb;
  --color-white: #ffffff;
  --font-sans: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-display: 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.08);
  --shadow-md: 0 4px 20px rgba(0,0,0,0.10);
  --shadow-lg: 0 10px 40px rgba(0,0,0,0.12);
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --max-width: 1200px;
}

/* === 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-sans);
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration: none; transition: color var(--transition); }
img { max-width: 100%; height: auto; display: block; }
ul, ol { list-style: none; }
button { cursor: pointer; border: none; background: none; font-family: inherit; }
input, textarea, select { font-family: inherit; }

/* === 布局容器 === */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

/* === 通用段落 === */
.section {
  padding: 90px 0;
}
.section-alt {
  background: var(--color-bg-alt);
}
.section-dark {
  background: var(--color-dark);
  color: var(--color-white);
}
.section-title {
  font-size: clamp(1.6rem, 3vw, 2.2rem);
  font-weight: 700;
  color: var(--color-dark);
  letter-spacing: -0.02em;
  margin-bottom: 12px;
}
.section-dark .section-title { color: var(--color-white); }
.section-subtitle {
  font-size: 1rem;
  color: var(--color-text-light);
  max-width: 520px;
  line-height: 1.8;
}
.section-header {
  margin-bottom: 56px;
}
.section-header-center {
  text-align: center;
}
.section-header-center .section-subtitle {
  margin: 0 auto;
}

/* === 按钮 === */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 32px;
  border-radius: var(--radius-md);
  font-size: 0.95rem;
  font-weight: 600;
  transition: all var(--transition);
  letter-spacing: 0.02em;
}
.btn-primary {
  background: var(--color-accent);
  color: #fff;
  box-shadow: 0 4px 14px rgba(26,86,219,0.3);
}
.btn-primary:hover {
  background: #1447b5;
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(26,86,219,0.4);
}
.btn-outline {
  border: 1.5px solid var(--color-border);
  color: var(--color-text);
}
.btn-outline:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
}
.btn-white {
  background: #fff;
  color: var(--color-accent);
  box-shadow: var(--shadow-md);
}
.btn-white:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

/* === 顶部导航 === */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(255,255,255,0.95);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
  transition: box-shadow var(--transition);
}
.site-header.scrolled {
  box-shadow: var(--shadow-md);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 68px;
}
.site-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.35rem;
  font-weight: 800;
  color: var(--color-dark);
  letter-spacing: -0.03em;
}
.logo-icon {
  width: 36px;
  height: 36px;
  background: linear-gradient(135deg, var(--color-accent), #60a5fa);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-size: 1rem;
  font-weight: 900;
}
.site-nav {
  display: flex;
  align-items: center;
  gap: 6px;
}
.site-nav a {
  padding: 8px 14px;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--color-text);
  transition: all var(--transition);
}
.site-nav a:hover, .site-nav a.active {
  color: var(--color-accent);
  background: rgba(26,86,219,0.06);
}
.nav-cta {
  background: var(--color-accent) !important;
  color: #fff !important;
  padding: 8px 18px !important;
}
.nav-cta:hover {
  background: #1447b5 !important;
}
.mobile-menu-btn {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 8px;
}
.mobile-menu-btn span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--color-dark);
  border-radius: 2px;
  transition: all var(--transition);
}

/* === 搜索框 === */
.search-bar-wrap {
  background: var(--color-bg-alt);
  border-bottom: 1px solid var(--color-border);
  padding: 10px 0;
}
.search-bar-inner {
  display: flex;
  align-items: center;
  max-width: 640px;
  margin: 0 auto;
  background: #fff;
  border: 1.5px solid var(--color-border);
  border-radius: 50px;
  padding: 0 20px;
  gap: 10px;
  transition: border-color var(--transition), box-shadow var(--transition);
}
.search-bar-inner:focus-within {
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px rgba(26,86,219,0.1);
}
.search-bar-inner input {
  flex: 1;
  border: none;
  outline: none;
  font-size: 0.9rem;
  padding: 10px 0;
  background: transparent;
  color: var(--color-text);
}
.search-bar-inner input::placeholder { color: #aaa; }
.search-bar-inner button {
  color: var(--color-accent);
  font-size: 1rem;
  display: flex;
  align-items: center;
}

/* === Hero Banner === */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  overflow: hidden;
  background: var(--color-dark);
}
.hero-bg {
  position: absolute;
  inset: 0;
  background-image: url('../assets/images/hero_banner.jpg');
  background-size: cover;
  background-position: center;
  opacity: 0.55;
}
.hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(10,14,26,0.85) 0%, rgba(26,86,219,0.15) 100%);
}
.hero-content {
  position: relative;
  z-index: 2;
  max-width: 700px;
}
.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: rgba(26,86,219,0.2);
  border: 1px solid rgba(26,86,219,0.4);
  color: #93c5fd;
  font-size: 0.8rem;
  font-weight: 600;
  padding: 6px 14px;
  border-radius: 50px;
  margin-bottom: 24px;
  letter-spacing: 0.05em;
}
.hero h1 {
  font-size: clamp(2.2rem, 5vw, 3.8rem);
  font-weight: 800;
  color: #fff;
  line-height: 1.2;
  letter-spacing: -0.03em;
  margin-bottom: 20px;
}
.hero h1 span {
  background: linear-gradient(135deg, #60a5fa, #a78bfa);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.hero-desc {
  font-size: 1.05rem;
  color: rgba(255,255,255,0.75);
  line-height: 1.8;
  margin-bottom: 36px;
  max-width: 560px;
}
.hero-actions {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
}
.hero-scroll {
  position: absolute;
  bottom: 36px;
  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;
  letter-spacing: 0.1em;
  animation: bounce 2s infinite;
}
@keyframes bounce {
  0%, 100% { transform: translateX(-50%) translateY(0); }
  50% { transform: translateX(-50%) translateY(8px); }
}

/* === 品牌介绍 === */
.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 80px;
  align-items: center;
}
.about-img-wrap {
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
}
.about-img-wrap img {
  width: 100%;
  height: 380px;
  object-fit: cover;
}
.about-tag {
  display: inline-block;
  background: rgba(26,86,219,0.08);
  color: var(--color-accent);
  font-size: 0.8rem;
  font-weight: 700;
  padding: 4px 12px;
  border-radius: 50px;
  letter-spacing: 0.08em;
  margin-bottom: 16px;
  text-transform: uppercase;
}
.about-text h2 {
  font-size: clamp(1.5rem, 2.5vw, 2rem);
  font-weight: 700;
  color: var(--color-dark);
  line-height: 1.3;
  margin-bottom: 16px;
  letter-spacing: -0.02em;
}
.about-text p {
  color: var(--color-text-light);
  line-height: 1.9;
  margin-bottom: 14px;
}
.about-list {
  margin: 20px 0;
}
.about-list li {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--color-text);
  font-size: 0.9rem;
  margin-bottom: 10px;
}
.about-list li::before {
  content: '';
  width: 6px;
  height: 6px;
  background: var(--color-accent);
  border-radius: 50%;
  flex-shrink: 0;
}

/* === 功能卡片 === */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}
.feature-card {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 36px 28px;
  transition: all 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(--color-accent), #60a5fa);
  transform: scaleX(0);
  transition: transform var(--transition);
}
.feature-card:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-4px);
  border-color: transparent;
}
.feature-card:hover::before {
  transform: scaleX(1);
}
.feature-icon {
  width: 52px;
  height: 52px;
  background: rgba(26,86,219,0.08);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.4rem;
  margin-bottom: 20px;
}
.feature-card h3 {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--color-dark);
  margin-bottom: 10px;
}
.feature-card p {
  font-size: 0.88rem;
  color: var(--color-text-light);
  line-height: 1.8;
}

/* === 视频区域 === */
.video-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 28px;
}
.video-card {
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  transition: all var(--transition);
  cursor: pointer;
}
.video-card:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-4px);
}
.video-thumb {
  position: relative;
  overflow: hidden;
  aspect-ratio: 16/9;
}
.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);
}
.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-circle {
  width: 60px;
  height: 60px;
  background: rgba(255,255,255,0.95);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 20px rgba(0,0,0,0.3);
  transition: transform var(--transition);
}
.video-card:hover .play-circle {
  transform: scale(1.1);
}
.play-circle svg {
  width: 22px;
  height: 22px;
  fill: var(--color-accent);
  margin-left: 3px;
}
.video-duration {
  position: absolute;
  bottom: 10px;
  right: 10px;
  background: rgba(0,0,0,0.7);
  color: #fff;
  font-size: 0.75rem;
  font-weight: 600;
  padding: 3px 8px;
  border-radius: 4px;
}
.video-info {
  padding: 18px 20px;
}
.video-info h3 {
  font-size: 0.92rem;
  font-weight: 600;
  color: var(--color-dark);
  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: 14px;
  font-size: 0.78rem;
  color: var(--color-text-light);
}
.video-meta span {
  display: flex;
  align-items: center;
  gap: 4px;
}

/* === 数据统计 === */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2px;
  background: rgba(255,255,255,0.1);
  border-radius: var(--radius-lg);
  overflow: hidden;
}
.stat-item {
  padding: 50px 40px;
  text-align: center;
  background: rgba(255,255,255,0.05);
  transition: background var(--transition);
}
.stat-item:hover {
  background: rgba(255,255,255,0.1);
}
.stat-number {
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 800;
  color: #fff;
  letter-spacing: -0.04em;
  line-height: 1;
  margin-bottom: 10px;
}
.stat-label {
  font-size: 0.9rem;
  color: rgba(255,255,255,0.65);
  letter-spacing: 0.02em;
}

/* === 用户评价 === */
.testimonials-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}
.testimonial-card {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 30px;
  transition: all var(--transition);
}
.testimonial-card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}
.testimonial-stars {
  display: flex;
  gap: 3px;
  margin-bottom: 14px;
}
.star { color: #f59e0b; font-size: 0.9rem; }
.testimonial-text {
  font-size: 0.9rem;
  color: var(--color-text);
  line-height: 1.8;
  margin-bottom: 20px;
  font-style: italic;
}
.testimonial-author {
  display: flex;
  align-items: center;
  gap: 12px;
}
.author-avatar {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--color-accent), #60a5fa);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-weight: 700;
  font-size: 0.9rem;
  flex-shrink: 0;
}
.author-info strong {
  display: block;
  font-size: 0.88rem;
  font-weight: 700;
  color: var(--color-dark);
}
.author-info span {
  font-size: 0.78rem;
  color: var(--color-text-light);
}

/* === FAQ === */
.faq-list {
  max-width: 800px;
  margin: 0 auto;
}
.faq-item {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  margin-bottom: 12px;
  overflow: hidden;
  transition: all var(--transition);
}
.faq-item.open {
  box-shadow: var(--shadow-sm);
}
.faq-question {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 24px;
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--color-dark);
  text-align: left;
  gap: 16px;
  transition: background var(--transition);
}
.faq-question:hover { background: var(--color-bg-alt); }
.faq-icon {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: var(--color-bg-alt);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  transition: all var(--transition);
  font-size: 1rem;
  color: var(--color-accent);
}
.faq-item.open .faq-icon {
  background: var(--color-accent);
  color: #fff;
  transform: rotate(45deg);
}
.faq-answer {
  display: none;
  padding: 0 24px 20px;
  font-size: 0.9rem;
  color: var(--color-text-light);
  line-height: 1.9;
}
.faq-item.open .faq-answer { display: block; }

/* === 联系我们 === */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1.4fr;
  gap: 60px;
  align-items: start;
}
.contact-info h2 {
  font-size: 1.8rem;
  font-weight: 700;
  color: var(--color-dark);
  margin-bottom: 14px;
  letter-spacing: -0.02em;
}
.contact-info p {
  color: var(--color-text-light);
  line-height: 1.8;
  margin-bottom: 28px;
}
.contact-item {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  margin-bottom: 20px;
}
.contact-item-icon {
  width: 42px;
  height: 42px;
  background: rgba(26,86,219,0.08);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
  flex-shrink: 0;
}
.contact-item-text strong {
  display: block;
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--color-dark);
  margin-bottom: 2px;
}
.contact-item-text span {
  font-size: 0.85rem;
  color: var(--color-text-light);
}
.contact-form {
  background: var(--color-bg-alt);
  border-radius: var(--radius-lg);
  padding: 36px;
}
.form-group {
  margin-bottom: 18px;
}
.form-group label {
  display: block;
  font-size: 0.83rem;
  font-weight: 600;
  color: var(--color-dark);
  margin-bottom: 6px;
}
.form-group input,
.form-group textarea,
.form-group select {
  width: 100%;
  padding: 12px 16px;
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  color: var(--color-text);
  background: #fff;
  transition: border-color var(--transition), box-shadow var(--transition);
  outline: none;
}
.form-group input:focus,
.form-group textarea:focus {
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px rgba(26,86,219,0.1);
}
.form-group textarea { resize: vertical; min-height: 110px; }
.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
}

/* === 页脚 === */
.site-footer {
  background: var(--color-dark-2);
  color: rgba(255,255,255,0.7);
  padding: 64px 0 28px;
}
.footer-top {
  display: grid;
  grid-template-columns: 1.8fr 1fr 1fr 1fr;
  gap: 48px;
  padding-bottom: 48px;
  border-bottom: 1px solid rgba(255,255,255,0.1);
  margin-bottom: 28px;
}
.footer-brand .site-logo {
  color: #fff;
  margin-bottom: 14px;
}
.footer-brand p {
  font-size: 0.85rem;
  line-height: 1.8;
  color: rgba(255,255,255,0.55);
  max-width: 260px;
}
.footer-social {
  display: flex;
  gap: 10px;
  margin-top: 20px;
}
.social-btn {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-sm);
  background: rgba(255,255,255,0.08);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.85rem;
  color: rgba(255,255,255,0.7);
  transition: all var(--transition);
}
.social-btn:hover {
  background: var(--color-accent);
  color: #fff;
  transform: translateY(-2px);
}
.footer-col h4 {
  font-size: 0.88rem;
  font-weight: 700;
  color: #fff;
  margin-bottom: 18px;
  letter-spacing: 0.04em;
}
.footer-col ul li {
  margin-bottom: 10px;
}
.footer-col ul li a {
  font-size: 0.83rem;
  color: rgba(255,255,255,0.55);
  transition: color var(--transition);
}
.footer-col ul li a:hover {
  color: #fff;
}
.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.8rem;
  color: rgba(255,255,255,0.4);
  flex-wrap: wrap;
  gap: 10px;
}
.footer-bottom a { color: rgba(255,255,255,0.55); }
.footer-bottom a:hover { color: #fff; }

/* === 视频弹窗 === */
.video-modal {
  display: none;
  position: fixed;
  inset: 0;
  z-index: 9999;
  background: rgba(0,0,0,0.85);
  align-items: center;
  justify-content: center;
}
.video-modal.active { display: flex; }
.video-modal-inner {
  background: #000;
  border-radius: var(--radius-lg);
  overflow: hidden;
  width: 90%;
  max-width: 800px;
  position: relative;
}
.video-modal-close {
  position: absolute;
  top: 12px;
  right: 12px;
  z-index: 10;
  background: rgba(255,255,255,0.15);
  color: #fff;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  transition: background var(--transition);
}
.video-modal-close:hover { background: rgba(255,255,255,0.3); }
.video-placeholder {
  aspect-ratio: 16/9;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, #0a0e1a, #1a1f2e);
  color: rgba(255,255,255,0.7);
  gap: 16px;
}
.video-placeholder .big-play {
  width: 80px;
  height: 80px;
  border-radius: 50%;
  background: rgba(26,86,219,0.4);
  border: 2px solid rgba(26,86,219,0.6);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2rem;
  animation: pulse 2s infinite;
}
@keyframes pulse {
  0%, 100% { box-shadow: 0 0 0 0 rgba(26,86,219,0.4); }
  50% { box-shadow: 0 0 0 16px rgba(26,86,219,0); }
}

/* === 面包屑 === */
.breadcrumb {
  padding: 14px 0;
  font-size: 0.82rem;
  color: var(--color-text-light);
  display: flex;
  align-items: center;
  gap: 6px;
  flex-wrap: wrap;
}
.breadcrumb a { color: var(--color-accent); }
.breadcrumb span { color: var(--color-text-light); }

/* === 内页 Hero === */
.inner-hero {
  background: linear-gradient(135deg, var(--color-dark) 0%, var(--color-dark-2) 100%);
  padding: 120px 0 70px;
  color: #fff;
  text-align: center;
}
.inner-hero h1 {
  font-size: clamp(1.8rem, 4vw, 2.8rem);
  font-weight: 800;
  margin-bottom: 14px;
  letter-spacing: -0.03em;
}
.inner-hero p {
  font-size: 1rem;
  color: rgba(255,255,255,0.7);
  max-width: 560px;
  margin: 0 auto;
}

/* === 响应式 === */
@media (max-width: 1024px) {
  .features-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-top { grid-template-columns: 1fr 1fr; }
  .about-grid { gap: 48px; }
}

@media (max-width: 768px) {
  .section { padding: 64px 0; }
  .site-nav { display: none; }
  .mobile-menu-btn { display: flex; }
  .hero h1 { font-size: 2rem; }
  .about-grid { grid-template-columns: 1fr; }
  .about-img-wrap { order: -1; }
  .features-grid { grid-template-columns: 1fr; }
  .video-grid { grid-template-columns: 1fr; }
  .stats-grid { grid-template-columns: 1fr; }
  .testimonials-grid { grid-template-columns: 1fr; }
  .contact-grid { grid-template-columns: 1fr; }
  .footer-top { grid-template-columns: 1fr 1fr; gap: 32px; }
  .footer-bottom { flex-direction: column; text-align: center; }
  .form-row { grid-template-columns: 1fr; }
  .hero-actions { flex-direction: column; }
  .hero-actions .btn { text-align: center; justify-content: center; }
}

@media (max-width: 480px) {
  .container { padding: 0 16px; }
  .footer-top { grid-template-columns: 1fr; }
  .stat-item { padding: 36px 24px; }
}

/* === 移动端菜单 === */
.mobile-nav {
  display: none;
  position: fixed;
  inset: 0;
  z-index: 999;
  background: rgba(10,14,26,0.97);
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 8px;
}
.mobile-nav.open { display: flex; }
.mobile-nav a {
  font-size: 1.3rem;
  font-weight: 600;
  color: rgba(255,255,255,0.85);
  padding: 12px 24px;
  border-radius: var(--radius-md);
  transition: all var(--transition);
}
.mobile-nav a:hover { color: #fff; background: rgba(26,86,219,0.2); }
.mobile-nav-close {
  position: absolute;
  top: 20px;
  right: 20px;
  color: rgba(255,255,255,0.7);
  font-size: 1.5rem;
  padding: 8px;
}

/* === 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);
}

/* === 分页/更多按钮 === */
.load-more-wrap {
  text-align: center;
  margin-top: 48px;
}

/* === 标签 === */
.tag {
  display: inline-block;
  background: rgba(26,86,219,0.08);
  color: var(--color-accent);
  font-size: 0.75rem;
  font-weight: 600;
  padding: 3px 10px;
  border-radius: 50px;
  letter-spacing: 0.04em;
}

/* === 分隔线 === */
.divider {
  width: 48px;
  height: 3px;
  background: linear-gradient(90deg, var(--color-accent), #60a5fa);
  border-radius: 2px;
  margin: 16px 0;
}
.divider-center { margin: 16px auto; }