/**
 * ============================================
 * 全局公共样式表 - 公益寻亲平台
 * ============================================
 * 包含：变量定义、重置样式、导航、底部、通用按钮、卡片、表单等公共组件
 */

/* ============================================
   1. CSS 变量定义（设计系统）
   ============================================ */
:root {
  /* 主色调 */
  --color-bg: #F7F3ED;
  --color-accent: #E6C5AF;
  --color-accent-hover: #D9B09A;
  --color-muted: #B8B1A9;
  --color-text: #4A382D;
  --color-text-light: #7A6E64;
  --color-danger: #A85E49;
  --color-dark-bg: #3D322B;

  /* 间距系统 */
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 1.5rem;
  --spacing-lg: 2rem;
  --spacing-xl: 3rem;
  --spacing-xxl: 4.5rem;

  /* 圆角 */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;

  /* 阴影 */
  --shadow-sm: 0 2px 8px rgba(74, 56, 45, 0.06);
  --shadow-md: 0 4px 16px rgba(74, 56, 45, 0.08);
  --shadow-lg: 0 8px 32px rgba(74, 56, 45, 0.12);

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

  /* 容器宽度 */
  --container-max: 1200px;
  --container-padding: 1.5rem;

  /* 字体 */
  --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --font-family-cn: 'PingFang SC', 'Microsoft YaHei', sans-serif;
}

/* ============================================
   2. 基础重置与全局样式
   ============================================ */
*,
*::before,
*::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-family);
  background-color: var(--color-bg);
  color: var(--color-text);
  line-height: 1.7;
  min-height: 100vh;
}

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

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

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

ul, ol {
  list-style: none;
}

button {
  cursor: pointer;
  border: none;
  background: none;
  font-family: inherit;
  font-size: inherit;
}

input, textarea, select {
  font-family: inherit;
  font-size: inherit;
}

h1, h2, h3, h4, h5, h6 {
  font-weight: 500;
  line-height: 1.4;
  color: var(--color-text);
}

/* ============================================
   3. 容器与布局
   ============================================ */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--container-padding);
}

.section {
  padding: var(--spacing-xxl) 0;
}

.section-title {
  font-size: 1.75rem;
  font-weight: 500;
  margin-bottom: var(--spacing-lg);
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.section-title svg {
  flex-shrink: 0;
  color: var(--color-accent);
}

.section-subtitle {
  font-size: 1rem;
  color: var(--color-text-light);
  margin-top: var(--spacing-xs);
}

/* ============================================
   4. 头部导航
   ============================================ */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background-color: rgba(247, 243, 237, 0.95);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid rgba(184, 177, 169, 0.3);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

/* LOGO */
.logo {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-weight: 600;
  font-size: 1.25rem;
  color: var(--color-text);
}

.logo svg,
.logo-img {
  width: 36px;
  height: 36px;
}
.logo svg {
  color: var(--color-accent);
}

.logo-text {
  display: flex;
  flex-direction: column;
  line-height: 1.2;
}

.logo-text span:first-child {
  font-size: 1.1rem;
  font-weight: 600;
}

.logo-text span:last-child {
  font-size: 0.75rem;
  color: var(--color-text-light);
  font-weight: 400;
}

/* 主导航 */
.main-nav {
  display: flex;
  align-items: center;
  gap: var(--spacing-lg);
}

.nav-link {
  position: relative;
  font-size: 0.95rem;
  color: var(--color-text);
  padding: 0.5rem 0;
  transition: color var(--transition-fast);
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background-color: var(--color-accent);
  transition: width var(--transition-normal);
}

.nav-link:hover {
  color: var(--color-accent);
}

.nav-link:hover::after,
.nav-link.active::after {
  width: 100%;
}

.nav-link.active {
  color: var(--color-accent);
}

/* 汉堡菜单按钮 */
.menu-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 32px;
  height: 32px;
  padding: 4px;
}

.menu-toggle span {
  display: block;
  width: 100%;
  height: 2px;
  background-color: var(--color-text);
  transition: all var(--transition-fast);
}

.menu-toggle.active span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

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

.menu-toggle.active span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* 移动端菜单 */
.mobile-nav {
  display: none;
  position: absolute;
  top: 100%;
  left: 0;
  right: 0;
  background-color: rgba(247, 243, 237, 0.98);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid rgba(184, 177, 169, 0.3);
  padding: var(--spacing-md);
  box-shadow: var(--shadow-md);
}

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

.mobile-nav .nav-link {
  display: block;
  padding: var(--spacing-sm) 0;
  border-bottom: 1px solid rgba(184, 177, 169, 0.2);
  font-size: 1rem;
}

.mobile-nav .nav-link:last-child {
  border-bottom: none;
}

/* 面包屑 */
.breadcrumb {
  padding: var(--spacing-sm) 0;
  font-size: 0.875rem;
  color: var(--color-text-light);
}

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

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

.breadcrumb span {
  margin: 0 0.5rem;
  color: var(--color-muted);
}

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

/* ============================================
   5. 底部 Footer
   ============================================ */
.site-footer {
  background: linear-gradient(180deg, var(--color-dark-bg) 0%, #2a2118 100%);
  color: rgba(247, 243, 237, 0.85);
  padding: 2rem 0 1.25rem;
}

/* 页脚主内容 */
.footer-main {
  display: grid;
  grid-template-columns: 1.2fr 1fr 1fr;
  gap: 1.5rem;
  padding-bottom: 1.25rem;
  border-bottom: 1px solid rgba(247, 243, 237, 0.1);
}

/* 品牌区 */
.footer-brand {
  display: flex;
  flex-direction: column;
}

.footer-logo {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-sm);
}

.footer-logo-icon {
  width: 36px;
  height: 36px;
  background: var(--color-accent);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
}

.footer-logo-icon svg {
  width: 20px;
  height: 20px;
  stroke: var(--color-text);
}

.footer-logo-text {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--color-bg);
}

.footer-brand-desc {
  font-size: 0.85rem;
  line-height: 1.6;
  color: rgba(247, 243, 237, 0.6);
  margin-bottom: var(--spacing-sm);
}

.footer-hotline-box {
  background: rgba(232, 197, 175, 0.1);
  border: 1px solid rgba(232, 197, 175, 0.2);
  border-radius: var(--radius-sm);
  padding: 0.75rem;
}

.footer-hotline-label {
  font-size: 0.8rem;
  color: rgba(247, 243, 237, 0.5);
  margin-bottom: 0.25rem;
}

.footer-hotline {
  font-size: 1.1rem;
  color: var(--color-accent);
  font-weight: 500;
}

/* 链接区块 */
.footer-section h4 {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--color-bg);
  margin-bottom: var(--spacing-sm);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.footer-section h4::before {
  content: '';
  width: 3px;
  height: 12px;
  background: var(--color-accent);
  border-radius: 2px;
}

.footer-section ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

.footer-section ul li {
  margin-bottom: 0.4rem;
}

.footer-section ul li a {
  color: rgba(247, 243, 237, 0.65);
  font-size: 0.9rem;
  transition: all var(--transition-fast);
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
}

.footer-section ul li a:hover {
  color: var(--color-accent);
  padding-left: 0.5rem;
}

/* 页脚底部 */
.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: var(--spacing-md);
  gap: var(--spacing-sm);
}

.footer-legal {
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
}

.copyright {
  font-size: 0.8rem;
  color: rgba(247, 243, 237, 0.5);
}

.icp {
  font-size: 0.75rem;
  color: rgba(247, 243, 237, 0.35);
}

.footer-slogan {
  font-size: 0.85rem;
  color: rgba(247, 243, 237, 0.4);
  font-style: italic;
  text-align: right;
}

/* ============================================
   6. 通用按钮
   ============================================ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.75rem 1.5rem;
  font-size: 0.95rem;
  font-weight: 500;
  border-radius: var(--radius-md);
  transition: all var(--transition-normal);
  cursor: pointer;
}

.btn-primary {
  background-color: var(--color-accent);
  color: var(--color-text);
}

.btn-primary:hover {
  background-color: var(--color-accent-hover);
  transform: translateY(-1px);
  box-shadow: var(--shadow-sm);
}

.btn-secondary {
  background-color: transparent;
  color: var(--color-text);
  border: 1px solid var(--color-muted);
}

.btn-secondary:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
}

.btn-danger {
  background-color: var(--color-danger);
  color: #fff;
}

.btn-danger:hover {
  background-color: #955649;
}

.btn-lg {
  padding: 1rem 2rem;
  font-size: 1rem;
}

.btn-sm {
  padding: 0.5rem 1rem;
  font-size: 0.85rem;
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

/* ============================================
   7. 卡片组件
   ============================================ */
.card {
  background-color: #fff;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-normal);
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}

.card-image {
  position: relative;
  width: 100%;
  aspect-ratio: 3 / 4;
  overflow: hidden;
  background-color: var(--color-muted);
}

.card-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-slow);
}

.card:hover .card-image img {
  transform: scale(1.03);
}

.card-content {
  padding: var(--spacing-md);
}

.card-title {
  font-size: 1.1rem;
  font-weight: 500;
  margin-bottom: 0.5rem;
}

.card-text {
  font-size: 0.9rem;
  color: var(--color-text-light);
  line-height: 1.6;
}

/* ============================================
   8. 表单元素
   ============================================ */
.form-group {
  margin-bottom: var(--spacing-md);
}

.form-label {
  display: block;
  font-size: 0.9rem;
  font-weight: 500;
  margin-bottom: 0.5rem;
  color: var(--color-text);
}

.form-label .required {
  color: var(--color-danger);
  margin-left: 2px;
}

.form-input,
.form-select,
.form-textarea {
  width: 100%;
  padding: 0.75rem 1rem;
  font-size: 1rem;
  color: var(--color-text);
  background-color: #fff;
  border: 1px solid var(--color-muted);
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
}

.form-input:focus,
.form-select:focus,
.form-textarea:focus {
  outline: none;
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px rgba(230, 197, 175, 0.2);
}

.form-input::placeholder,
.form-textarea::placeholder {
  color: var(--color-muted);
}

.form-textarea {
  min-height: 120px;
  resize: vertical;
}

.form-select {
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%23B8B1A9' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 1rem center;
  padding-right: 2.5rem;
}

.form-hint {
  font-size: 0.8rem;
  color: var(--color-text-light);
  margin-top: 0.35rem;
}

.form-error {
  font-size: 0.8rem;
  color: var(--color-danger);
  margin-top: 0.35rem;
  display: none;
}

.form-group.error .form-input,
.form-group.error .form-select,
.form-group.error .form-textarea {
  border-color: var(--color-danger);
}

.form-group.error .form-error {
  display: block;
}

/* 文件上传 */
.form-file {
  position: relative;
}

.form-file-input {
  position: absolute;
  width: 100%;
  height: 100%;
  opacity: 0;
  cursor: pointer;
}

.form-file-preview {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1rem;
  padding: 2rem;
  border: 2px dashed var(--color-muted);
  border-radius: var(--radius-md);
  text-align: center;
  color: var(--color-text-light);
  transition: all var(--transition-fast);
}

.form-file:hover .form-file-preview {
  border-color: var(--color-accent);
  background-color: rgba(230, 197, 175, 0.05);
}

.form-file svg {
  width: 32px;
  height: 32px;
  color: var(--color-muted);
}

/* ============================================
   9. 分页组件
   ============================================ */
.pagination {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  margin-top: var(--spacing-xl);
}

.pagination-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  min-width: 40px;
  height: 40px;
  padding: 0 0.75rem;
  font-size: 0.9rem;
  color: var(--color-text);
  background-color: #fff;
  border: 1px solid var(--color-muted);
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
}

.pagination-btn:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
}

.pagination-btn.active {
  background-color: var(--color-accent);
  border-color: var(--color-accent);
  color: var(--color-text);
}

.pagination-btn:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

.pagination-ellipsis {
  color: var(--color-muted);
  padding: 0 0.5rem;
}

/* ============================================
   10. 提示弹窗
   ============================================ */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: rgba(74, 56, 45, 0.4);
  backdrop-filter: blur(4px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 2000;
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-normal);
}

.modal-overlay.active {
  opacity: 1;
  visibility: visible;
}

.modal {
  background-color: #fff;
  border-radius: var(--radius-lg);
  padding: var(--spacing-xl);
  max-width: 480px;
  width: 90%;
  text-align: center;
  transform: translateY(20px);
  transition: transform var(--transition-normal);
}

.modal-overlay.active .modal {
  transform: translateY(0);
}

.modal-icon {
  width: 64px;
  height: 64px;
  margin: 0 auto var(--spacing-md);
  color: var(--color-accent);
}

.modal-title {
  font-size: 1.25rem;
  font-weight: 500;
  margin-bottom: var(--spacing-sm);
}

.modal-text {
  color: var(--color-text-light);
  margin-bottom: var(--spacing-lg);
}

.modal-close {
  position: absolute;
  top: 1rem;
  right: 1rem;
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-muted);
  transition: color var(--transition-fast);
}

.modal-close:hover {
  color: var(--color-text);
}

/* ============================================
   11. 空状态与加载
   ============================================ */
.empty-state {
  text-align: center;
  padding: var(--spacing-xxl) var(--spacing-lg);
}

.empty-state svg {
  width: 80px;
  height: 80px;
  color: var(--color-muted);
  margin-bottom: var(--spacing-md);
}

.empty-state h3 {
  font-size: 1.25rem;
  margin-bottom: var(--spacing-sm);
}

.empty-state p {
  color: var(--color-text-light);
  margin-bottom: var(--spacing-lg);
}

/* ============================================
   12. 标签与徽章
   ============================================ */
.tag {
  display: inline-flex;
  align-items: center;
  padding: 0.25rem 0.75rem;
  font-size: 0.8rem;
  font-weight: 500;
  border-radius: 100px;
  background-color: rgba(230, 197, 175, 0.2);
  color: var(--color-text);
}

.tag-urgent {
  background-color: rgba(168, 94, 73, 0.15);
  color: var(--color-danger);
}

.tag-success {
  background-color: rgba(107, 142, 107, 0.15);
  color: #5B8B5B;
}

/* ============================================
   13. 响应式断点
   ============================================ */

/* 平板端 768px - 992px */
@media (max-width: 992px) {
  :root {
    --container-padding: 1.25rem;
    --spacing-xxl: 3.5rem;
  }

  .section {
    padding: var(--spacing-xl) 0;
  }

  /* 平板端 footer */
  .footer-main {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-lg);
  }

  .footer-brand {
    grid-column: 1 / -1;
  }

  .footer-bottom {
    flex-direction: column;
    text-align: center;
  }

  .footer-slogan {
    text-align: center;
  }
}

/* 移动端 < 768px */
@media (max-width: 768px) {
  :root {
    --container-padding: 1rem;
    --spacing-xxl: 2.5rem;
  }

  .header-inner {
    height: 64px;
  }

  .main-nav {
    display: none;
  }

  .menu-toggle {
    display: flex;
  }

  .section-title {
    font-size: 1.5rem;
  }

  /* 移动端 footer */
  .footer-main {
    grid-template-columns: 1fr;
    gap: var(--spacing-lg);
  }

  .footer-brand {
    grid-column: 1;
  }

  .footer-bottom {
    flex-direction: column;
    gap: var(--spacing-xs);
    text-align: center;
  }

  .footer-slogan {
    text-align: center;
  }

  .btn-lg {
    padding: 0.875rem 1.5rem;
    font-size: 0.95rem;
  }
}

/* ============================================
   14. 辅助工具类
   ============================================ */
.text-center {
  text-align: center;
}

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

.mt-sm { margin-top: var(--spacing-sm); }
.mt-md { margin-top: var(--spacing-md); }
.mt-lg { margin-top: var(--spacing-lg); }
.mb-sm { margin-bottom: var(--spacing-sm); }
.mb-md { margin-bottom: var(--spacing-md); }
.mb-lg { margin-bottom: var(--spacing-lg); }

/* ============================================
   15. 博物馆级开场动画 (Intro Animation)
   ============================================ */

/* 开场动画遮罩层 */
.intro-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: var(--color-bg);
  z-index: 9999;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  opacity: 1;
  transition: opacity 1.2s cubic-bezier(0.4, 0, 0.2, 1);
}

.intro-overlay.fade-out {
  opacity: 0;
  pointer-events: none;
}

.intro-overlay.hidden {
  display: none;
}

/* 动画容器 */
.intro-container {
  text-align: center;
  max-width: 600px;
  padding: 2rem;
}

/* LOGO 动画 */
.intro-logo {
  width: 120px;
  height: 120px;
  margin: 0 auto 2rem;
  opacity: 0;
  transform: translateY(30px) scale(0.95);
  animation: introLogoReveal 1.5s cubic-bezier(0.4, 0, 0.2, 1) 0.3s forwards;
}

.intro-logo svg {
  width: 100%;
  height: 100%;
}

/* 文字入场动画 */
.intro-title {
  font-size: 2.5rem;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 0.5rem;
  opacity: 0;
  transform: translateY(25px);
  animation: introTextReveal 1.2s cubic-bezier(0.4, 0, 0.2, 1) 0.8s forwards;
  letter-spacing: 0.15em;
}

.intro-subtitle {
  font-size: 1rem;
  color: var(--color-text-light);
  margin-bottom: 2rem;
  opacity: 0;
  transform: translateY(20px);
  animation: introTextReveal 1s cubic-bezier(0.4, 0, 0.2, 1) 1.1s forwards;
  letter-spacing: 0.3em;
}

.intro-tagline {
  font-size: 0.85rem;
  color: var(--color-muted);
  font-style: italic;
  opacity: 0;
  transform: translateY(15px);
  animation: introTextReveal 0.8s cubic-bezier(0.4, 0, 0.2, 1) 1.4s forwards;
}

/* 装饰性横线 */
.intro-divider {
  width: 60px;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--color-accent), transparent);
  margin: 1.5rem auto;
  opacity: 0;
  transform: scaleX(0);
  animation: introDividerReveal 1s cubic-bezier(0.4, 0, 0.2, 1) 1.2s forwards;
}

/* 进度指示器 */
.intro-progress {
  position: absolute;
  bottom: 3rem;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  gap: 8px;
}

.intro-progress-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background-color: var(--color-muted);
  opacity: 0;
  animation: introDotReveal 0.5s ease forwards;
}

.intro-progress-dot:nth-child(1) { animation-delay: 1.6s; }
.intro-progress-dot:nth-child(2) { animation-delay: 1.7s; }
.intro-progress-dot:nth-child(3) { animation-delay: 1.8s; }

.intro-progress-dot.active {
  background-color: var(--color-accent);
  animation: introDotPulse 1.5s ease-in-out infinite;
}

/* 关键帧动画 */
@keyframes introLogoReveal {
  0% {
    opacity: 0;
    transform: translateY(30px) scale(0.95);
  }
  100% {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

@keyframes introTextReveal {
  0% {
    opacity: 0;
    transform: translateY(20px);
  }
  100% {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes introDividerReveal {
  0% {
    opacity: 0;
    transform: scaleX(0);
  }
  100% {
    opacity: 1;
    transform: scaleX(1);
  }
}

@keyframes introDotReveal {
  0% {
    opacity: 0;
    transform: scale(0);
  }
  100% {
    opacity: 1;
    transform: scale(1);
  }
}

@keyframes introDotPulse {
  0%, 100% {
    transform: scale(1);
    opacity: 1;
  }
  50% {
    transform: scale(1.3);
    opacity: 0.7;
  }
}

/* 滚动淡入效果 (Scroll Reveal) */
.reveal {
  opacity: 0;
  transform: translateY(40px);
  transition: opacity 0.8s cubic-bezier(0.4, 0, 0.2, 1), 
              transform 0.8s cubic-bezier(0.4, 0, 0.2, 1);
}

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

/* 延迟变体 */
.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; }

/* 移动端适配 */
@media (max-width: 768px) {
  .intro-title {
    font-size: 1.8rem;
    letter-spacing: 0.1em;
  }
  
  .intro-subtitle {
    font-size: 0.9rem;
    letter-spacing: 0.15em;
  }
  
  .intro-logo {
    width: 90px;
    height: 90px;
  }
}