/* ============================================
   皎月科技 - 全局样式表
   设计主题：科技蓝 · 深色背景 · 毛玻璃质感
   ============================================ */

/* --- CSS 变量 / 设计系统 --- */
:root {
  /* 背景 */
  --bg-primary: #0a0e1a;
  --bg-secondary: #111827;
  --bg-card: rgba(17, 24, 39, 0.75);
  --bg-card-hover: rgba(30, 41, 59, 0.85);

  /* 色彩 */
  --color-primary: #3b82f6;
  --color-primary-light: #60a5fa;
  --color-accent: #06b6d4;
  --color-accent-light: #22d3ee;
  --color-purple: #8b5cf6;

  /* 渐变 */
  --gradient-primary: linear-gradient(135deg, #3b82f6, #8b5cf6);
  --gradient-accent: linear-gradient(135deg, #06b6d4, #3b82f6);
  --gradient-hero: linear-gradient(180deg, rgba(10, 14, 26, 0.7) 0%, rgba(10, 14, 26, 0.95) 100%);
  --gradient-card-border: linear-gradient(135deg, rgba(59, 130, 246, 0.3), rgba(139, 92, 246, 0.3));

  /* 文字 */
  --text-primary: #f1f5f9;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;

  /* 边框 */
  --border-color: rgba(59, 130, 246, 0.15);
  --border-glow: rgba(59, 130, 246, 0.4);

  /* 阴影 */
  --shadow-card: 0 4px 24px rgba(0, 0, 0, 0.3);
  --shadow-card-hover: 0 8px 40px rgba(59, 130, 246, 0.15);
  --shadow-glow: 0 0 30px rgba(59, 130, 246, 0.2);

  /* 间距 */
  --section-padding: 100px 0;
  --container-max: 1200px;

  /* 圆角 */
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-xl: 28px;

  /* 过渡 */
  --transition-fast: 0.2s ease;
  --transition-base: 0.3s ease;
  --transition-slow: 0.5s ease;

  /* 导航高度 */
  --nav-height: 72px;
}

/* --- Reset & Base --- */
*,
*::before,
*::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.7;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

a {
  color: var(--color-primary-light);
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover {
  color: var(--color-accent-light);
}

ul {
  list-style: none;
}

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

/* --- 容器 --- */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 24px;
}

/* --- 区块通用 --- */
.section {
  padding: var(--section-padding);
  position: relative;
}

.section-header {
  text-align: center;
  margin-bottom: 60px;
}

.section-tag {
  display: inline-block;
  padding: 6px 18px;
  border: 1px solid rgba(59, 130, 246, 0.3);
  border-radius: 50px;
  font-size: 0.85rem;
  color: var(--color-primary-light);
  letter-spacing: 0.05em;
  margin-bottom: 16px;
  background: rgba(59, 130, 246, 0.08);
}

.section-title {
  font-size: 2.4rem;
  font-weight: 700;
  margin-bottom: 16px;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1.3;
}

.section-desc {
  font-size: 1.1rem;
  color: var(--text-secondary);
  max-width: 640px;
  margin: 0 auto;
}

/* ============================================
   导航栏
   ============================================ */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: var(--nav-height);
  z-index: 1000;
  transition: all var(--transition-base);
  background: transparent;
}

.navbar.scrolled {
  background: rgba(10, 14, 26, 0.85);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border-color);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
}

.navbar .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: 0.02em;
}

.nav-logo .logo-icon {
  width: 38px;
  height: 38px;
  background: var(--gradient-primary);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  color: #fff;
}

.nav-logo .logo-img {
  width: 38px;
  height: 38px;
  border-radius: var(--radius-sm);
  object-fit: contain;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 8px;
}

.nav-links a {
  display: block;
  padding: 8px 18px;
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  font-size: 0.95rem;
  font-weight: 500;
  transition: all var(--transition-fast);
  position: relative;
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--text-primary);
  background: rgba(59, 130, 246, 0.1);
}

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

/* 语言切换按钮 */
.lang-switch {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 6px 14px;
  border: 1px solid rgba(59, 130, 246, 0.35);
  border-radius: 50px;
  color: var(--color-primary-light) !important;
  font-size: 0.82rem !important;
  font-weight: 600 !important;
  letter-spacing: 0.03em;
  cursor: pointer;
  margin-left: 12px;
  background: transparent;
  transition: all var(--transition-fast);
}

.lang-switch:hover {
  background: rgba(59, 130, 246, 0.15) !important;
  border-color: var(--color-primary) !important;
  color: var(--color-accent-light) !important;
}

/* 汉堡菜单按钮 */
.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 8px;
  z-index: 1001;
  background: none;
  border: none;
}

.hamburger span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--text-primary);
  border-radius: 1px;
  transition: all var(--transition-fast);
}

.hamburger.active span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}

.hamburger.active span:nth-child(2) {
  opacity: 0;
}

.hamburger.active span:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -5px);
}

/* ============================================
   Hero 区域
   ============================================ */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  position: relative;
  overflow: hidden;
  padding: 120px 24px 80px;
}

.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background: var(--gradient-hero);
  z-index: 1;
}

/* 网格背景 */
.hero-grid {
  position: absolute;
  inset: 0;
  z-index: 0;
  background-image: linear-gradient(rgba(59, 130, 246, 0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(59, 130, 246, 0.05) 1px, transparent 1px);
  background-size: 60px 60px;
  mask-image: radial-gradient(ellipse at center, black 30%, transparent 70%);
  -webkit-mask-image: radial-gradient(ellipse at center, black 30%, transparent 70%);
}

/* 粒子画布 */
.hero-particles {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.hero-content {
  position: relative;
  z-index: 2;
  max-width: 800px;
}

.hero-badge {
  display: inline-block;
  padding: 8px 24px;
  border: 1px solid rgba(6, 182, 212, 0.3);
  border-radius: 50px;
  font-size: 0.9rem;
  color: var(--color-accent-light);
  margin-bottom: 28px;
  background: rgba(6, 182, 212, 0.08);
  letter-spacing: 0.05em;
  animation: fadeInDown 0.8s ease;
}

.hero-title {
  font-size: 3.5rem;
  font-weight: 800;
  line-height: 1.25;
  margin-bottom: 24px;
  animation: fadeInUp 0.8s ease;
}

.hero-title .gradient-text {
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-subtitle {
  font-size: 1.2rem;
  color: var(--text-secondary);
  margin-bottom: 40px;
  max-width: 800px;
  margin-left: auto;
  margin-right: auto;
  white-space: nowrap;
  animation: fadeInUp 0.8s ease 0.15s both;
}

.hero-buttons {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
  animation: fadeInUp 0.8s ease 0.3s both;
}

/* --- 按钮 --- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 32px;
  border-radius: 50px;
  font-size: 1rem;
  font-weight: 600;
  border: none;
  cursor: pointer;
  transition: all var(--transition-base);
  letter-spacing: 0.02em;
  text-decoration: none;
}

.btn-primary {
  background: var(--gradient-primary);
  color: #fff;
  box-shadow: 0 4px 20px rgba(59, 130, 246, 0.3);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(59, 130, 246, 0.45);
  color: #fff;
}

.btn-outline {
  background: transparent;
  color: var(--text-primary);
  border: 1px solid rgba(255, 255, 255, 0.2);
}

.btn-outline:hover {
  border-color: var(--color-primary);
  background: rgba(59, 130, 246, 0.1);
  color: var(--text-primary);
  transform: translateY(-2px);
}

.btn-sm {
  padding: 8px 20px;
  font-size: 0.9rem;
}

/* --- 粒子画布 --- */
#particlesCanvas {
  position: absolute;
  inset: 0;
  z-index: 0;
}

/* ============================================
   卡片组件
   ============================================ */
.card {
  background: var(--bg-card);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 40px 32px;
  transition: all var(--transition-base);
  position: relative;
  overflow: hidden;
}

.card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--gradient-primary);
  opacity: 0;
  transition: opacity var(--transition-base);
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-card-hover);
  border-color: var(--border-glow);
  background: var(--bg-card-hover);
}

.card:hover::before {
  opacity: 1;
}

.card-icon {
  width: 56px;
  height: 56px;
  border-radius: var(--radius-md);
  background: rgba(59, 130, 246, 0.1);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.6rem;
  margin-bottom: 20px;
  transition: all var(--transition-base);
}

.card:hover .card-icon {
  background: rgba(59, 130, 246, 0.2);
  transform: scale(1.05);
}

.card-title {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 12px;
  color: var(--text-primary);
}

.card-desc {
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

.card-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-top: 16px;
  font-weight: 600;
  font-size: 0.95rem;
  color: var(--color-primary-light);
}

.card-link:hover {
  color: var(--color-accent-light);
  gap: 10px;
}

/* --- 产品卡片（带图） --- */
.product-card {
  background: var(--bg-card);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: all var(--transition-base);
  display: flex;
  flex-direction: column;
}

.product-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-card-hover);
  border-color: var(--border-glow);
}

.product-card-image {
  width: 100%;
  height: 220px;
  background: linear-gradient(135deg, #1e293b, #0f172a);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 3rem;
  position: relative;
  overflow: hidden;
}

.product-card-image::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 60px;
  background: linear-gradient(transparent, var(--bg-card));
}

.product-card-body {
  padding: 28px;
  flex: 1;
  display: flex;
  flex-direction: column;
}

.product-card-body .card-title {
  margin-bottom: 8px;
}

.product-card-body .card-desc {
  flex: 1;
  margin-bottom: 16px;
}

/* --- 特性卡片 --- */
.feature-card {
  text-align: center;
  padding: 36px 28px;
}

.feature-card .feature-number {
  font-size: 2.8rem;
  font-weight: 800;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 4px;
}

.feature-card .feature-label {
  font-size: 1rem;
  color: var(--text-secondary);
}

/* --- 网格布局 --- */
.grid-2 {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 32px;
}

.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}

.grid-4 {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

/* ============================================
   图文交替行
   ============================================ */
.media-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
  margin-bottom: 80px;
}

.media-row:last-child {
  margin-bottom: 0;
}

.media-row.reverse .media-image {
  order: 2;
}

.media-row.reverse .media-text {
  order: 1;
}

.media-image {
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--border-color);
  position: relative;
  padding: 16px;
  background: var(--bg-card);
}

.media-image-placeholder {
  width: 100%;
  aspect-ratio: 16 / 10;
  background: linear-gradient(135deg, #1e293b 0%, #0f172a 50%, #1a1a2e 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 3rem;
  position: relative;
  overflow: hidden;
}

.media-image-placeholder::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(
    45deg,
    transparent 30%,
    rgba(59, 130, 246, 0.05) 50%,
    transparent 70%
  );
  animation: shimmer 3s infinite;
}

.media-label {
  font-size: 0.85rem;
  color: var(--color-accent-light);
  margin-bottom: 8px;
  font-weight: 600;
  letter-spacing: 0.05em;
}

.media-title {
  font-size: 1.6rem;
  font-weight: 700;
  margin-bottom: 16px;
  color: var(--text-primary);
}

.media-desc {
  font-size: 1rem;
  color: var(--text-secondary);
  line-height: 1.8;
}

/* ============================================
   模块列表（智慧团委等）
   ============================================ */
.module-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.module-item {
  display: flex;
  align-items: flex-start;
  gap: 20px;
  padding: 24px 28px;
  background: var(--bg-card);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
}

.module-item:hover {
  border-color: var(--border-glow);
  background: var(--bg-card-hover);
  transform: translateX(6px);
}

.module-icon {
  flex-shrink: 0;
  width: 48px;
  height: 48px;
  border-radius: var(--radius-sm);
  background: rgba(59, 130, 246, 0.1);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.4rem;
}

.module-content h4 {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 4px;
}

.module-content p {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* ============================================
   CTA 区域
   ============================================ */
.cta-section {
  text-align: center;
  padding: 100px 24px;
  position: relative;
  overflow: hidden;
}

.cta-section::before {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse at center, rgba(59, 130, 246, 0.08) 0%, transparent 70%);
}

.cta-title {
  font-size: 2.2rem;
  font-weight: 700;
  margin-bottom: 16px;
  position: relative;
}

.cta-desc {
  font-size: 1.1rem;
  color: var(--text-secondary);
  margin-bottom: 36px;
  position: relative;
}

/* ============================================
   Page Hero（内页通用）
   ============================================ */
.page-hero {
  min-height: 45vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  position: relative;
  overflow: hidden;
  padding: 140px 24px 60px;
}

.page-hero .hero-grid {
  position: absolute;
  inset: 0;
}

.page-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(10, 14, 26, 0.5) 0%, rgba(10, 14, 26, 0.98) 100%);
  z-index: 1;
}

.page-hero .hero-content {
  z-index: 2;
}

.page-hero .hero-title {
  font-size: 2.8rem;
}

/* ============================================
   页脚
   ============================================ */
.footer {
  background: var(--bg-secondary);
  border-top: 1px solid var(--border-color);
  padding: 18px 0;
  text-align: center;
}

.footer-line {
  font-size: 0.82rem;
  color: var(--text-muted);
  line-height: 1.8;
}

.footer-sep {
  color: rgba(255, 255, 255, 0.12);
  margin: 0 10px;
}

.footer-icp {
  margin-top: 6px;
  font-size: 0.78rem;
}

.footer-icp a {
  color: var(--text-muted);
  text-decoration: none;
}

.footer-icp a:hover {
  color: var(--text-secondary);
}

/* ============================================
   联系我们页面
   ============================================ */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: 48px;
  align-items: start;
}

.contact-info-list {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.contact-info-item {
  display: flex;
  align-items: flex-start;
  gap: 16px;
}

.contact-info-icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-sm);
  background: rgba(59, 130, 246, 0.1);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.3rem;
  flex-shrink: 0;
}

.contact-info-text h4 {
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 4px;
}

.contact-info-text p {
  font-size: 0.95rem;
  color: var(--text-secondary);
}

/* 微信公众号二维码 */
.contact-qr {
  margin-bottom: 36px;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.contact-qr img {
  width: 120px;
  height: 120px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
  background: #fff;
  padding: 6px;
  display: block;
}

.contact-qr p {
  margin-top: 10px;
  font-size: 0.9rem;
  color: var(--text-secondary);
}

/* 留言表单 */
.contact-form-card {
  background: var(--bg-card);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 40px;
}

.form-group {
  margin-bottom: 20px;
}

.form-group label {
  display: block;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: 8px;
}

.form-group input,
.form-group textarea {
  width: 100%;
  padding: 12px 16px;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-size: 1rem;
  font-family: inherit;
  transition: all var(--transition-fast);
  outline: none;
}

.form-group input:focus,
.form-group textarea:focus {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.15);
  background: rgba(255, 255, 255, 0.06);
}

.form-group textarea {
  min-height: 140px;
  resize: vertical;
}

.form-submit-message {
  padding: 12px 18px;
  border-radius: var(--radius-sm);
  font-size: 0.95rem;
  margin-top: 16px;
  display: none;
}

.form-submit-message.success {
  display: block;
  background: rgba(34, 197, 94, 0.1);
  border: 1px solid rgba(34, 197, 94, 0.3);
  color: #4ade80;
}

.form-submit-message.error {
  display: block;
  background: rgba(239, 68, 68, 0.1);
  border: 1px solid rgba(239, 68, 68, 0.3);
  color: #f87171;
}

/* ============================================
   关于页面
   ============================================ */
.about-content {
  max-width: 800px;
  margin: 0 auto;
}

.about-block {
  margin-bottom: 48px;
}

.about-block:last-child {
  margin-bottom: 0;
}

.about-block h3 {
  font-size: 1.4rem;
  font-weight: 700;
  margin-bottom: 16px;
  color: var(--text-primary);
}

.about-block p {
  font-size: 1.05rem;
  color: var(--text-secondary);
  line-height: 1.9;
}

/* 资质标签 */
.tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 16px;
}

.tag-item {
  padding: 8px 20px;
  background: rgba(59, 130, 246, 0.08);
  border: 1px solid rgba(59, 130, 246, 0.2);
  border-radius: 50px;
  font-size: 0.9rem;
  color: var(--color-primary-light);
}

/* ============================================
   子导航（产品页内部切换）
   ============================================ */
.sub-nav {
  display: flex;
  justify-content: center;
  gap: 12px;
  flex-wrap: wrap;
  margin-bottom: 48px;
}

.sub-nav a {
  padding: 10px 24px;
  border-radius: 50px;
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  font-size: 0.95rem;
  font-weight: 500;
  transition: all var(--transition-fast);
  background: transparent;
}

.sub-nav a:hover,
.sub-nav a.active {
  background: rgba(59, 130, 246, 0.1);
  border-color: var(--color-primary);
  color: var(--color-primary-light);
}

/* ============================================
   面包屑
   ============================================ */
.breadcrumb {
  display: flex;
  gap: 8px;
  align-items: center;
  font-size: 0.9rem;
  color: var(--text-muted);
  margin-bottom: 8px;
}

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

.breadcrumb a:hover {
  color: var(--color-primary-light);
}

.breadcrumb .sep {
  color: var(--text-muted);
}

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

@keyframes fadeInDown {
  from {
    opacity: 0;
    transform: translateY(-20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes shimmer {
  0% { transform: translateX(-100%); }
  100% { transform: translateX(100%); }
}

/* 滚动显示动画 */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}

.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

/* 延迟 */
.reveal-delay-1 { transition-delay: 0.1s; }
.reveal-delay-2 { transition-delay: 0.2s; }
.reveal-delay-3 { transition-delay: 0.3s; }
.reveal-delay-4 { transition-delay: 0.4s; }

/* ============================================
   响应式设计
   ============================================ */

@media (max-width: 1024px) {
  :root {
    --section-padding: 80px 0;
  }

  .hero-title {
    font-size: 2.6rem;
  }

  .page-hero .hero-title {
    font-size: 2.2rem;
  }

  .section-title {
    font-size: 2rem;
  }

  .grid-3,
  .grid-4 {
    grid-template-columns: repeat(2, 1fr);
  }

  .media-row {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .media-row.reverse .media-image {
    order: 0;
  }

  .contact-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  :root {
    --section-padding: 60px 0;
    --nav-height: 64px;
  }

  .hero-title {
    font-size: 2rem;
  }

  .page-hero .hero-title {
    font-size: 1.8rem;
  }

  .section-title {
    font-size: 1.7rem;
  }

  .hero-subtitle {
    font-size: 1rem;
    white-space: normal;
  }

  .grid-2,
  .grid-3,
  .grid-4 {
    grid-template-columns: 1fr;
  }

  /* 移动端导航 */
  .hamburger {
    display: flex;
  }

  .nav-links {
    position: fixed;
    top: 0;
    right: -100%;
    width: 280px;
    height: 100vh;
    flex-direction: column;
    justify-content: center;
    background: rgba(10, 14, 26, 0.95);
    backdrop-filter: blur(24px);
    -webkit-backdrop-filter: blur(24px);
    border-left: 1px solid var(--border-color);
    padding: 40px 24px;
    gap: 4px;
    transition: right var(--transition-base);
    z-index: 1000;
  }

  .nav-links.active {
    right: 0;
  }

  .nav-links a {
    padding: 12px 18px;
    font-size: 1.05rem;
  }

  /* 移动端遮罩 */
  .nav-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.5);
    z-index: 999;
  }

  .nav-overlay.active {
    display: block;
  }

  .contact-form-card {
    padding: 24px;
  }
}

@media (max-width: 480px) {
  .hero-title {
    font-size: 1.7rem;
  }

  .hero-buttons {
    flex-direction: column;
    align-items: center;
  }

  .btn {
    width: 100%;
    justify-content: center;
  }

  .section-title {
    font-size: 1.4rem;
  }

  .container {
    padding: 0 16px;
  }
}

/* ============================================
   图片轮播
   ============================================ */
/* ============================================
   图片轮播
   ============================================ */
.img-carousel {
  position: relative;
  width: 100%;
  overflow: hidden;
  border-radius: 0;
}

.img-carousel-track {
  display: flex;
  flex-wrap: nowrap;
  transition: transform 0.4s ease;
}

.img-carousel-track img {
  flex: 0 0 100%;
  max-width: 100%;
  height: auto;
  display: block;
  object-fit: cover;
  aspect-ratio: 16 / 9;
}

.img-carousel-btn {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: rgba(0, 0, 0, 0.55);
  backdrop-filter: blur(6px);
  border: 1px solid rgba(255, 255, 255, 0.15);
  color: #fff;
  font-size: 1rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-fast);
  z-index: 2;
  opacity: 0;
}

.img-carousel:hover .img-carousel-btn {
  opacity: 1;
}

.img-carousel-btn:hover {
  background: rgba(59, 130, 246, 0.7);
  border-color: var(--color-primary);
}

.img-carousel-btn.prev { left: 10px; }
.img-carousel-btn.next { right: 10px; }

.img-carousel-dots {
  position: absolute;
  bottom: 12px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  gap: 6px;
  z-index: 2;
}

.img-carousel-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.4);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.img-carousel-dot.active {
  background: #fff;
  width: 20px;
  border-radius: 4px;
}

/* 单张图片无轮播按钮 */
.img-carousel.single .img-carousel-btn,
.img-carousel.single .img-carousel-dots {
  display: none;
}