/* =====================================================
   deepl翻译官网 - 主样式文件
   设计规范：DeepL官网风格
   颜色系统：
   - 主色：#0F2B46 (深海蓝)
   - 辅色：#0A9396 (青绿色)
   - 强调：#00B4D8 (亮蓝)
   - 背景：#F8FAFB
   - 文字：#1A1A2E
===================================================== */

/* ===== CSS变量 ===== */
:root {
  --color-primary: #0F2B46;
  --color-secondary: #0A9396;
  --color-accent: #00B4D8;
  --color-accent-light: #90E0EF;
  --color-bg: #F8FAFB;
  --color-bg-alt: #EEF4F7;
  --color-text: #1A1A2E;
  --color-text-light: #4A5568;
  --color-text-muted: #718096;
  --color-border: #E2E8F0;
  --color-white: #FFFFFF;
  --color-success: #38A169;
  --color-warning: #F4A261;

  --font-family: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-size-xs: 0.75rem;
  --font-size-sm: 0.875rem;
  --font-size-base: 1rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.25rem;
  --font-size-2xl: 1.5rem;
  --font-size-3xl: 1.875rem;
  --font-size-4xl: 2.25rem;
  --font-size-5xl: 3rem;

  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;
  --spacing-2xl: 3rem;
  --spacing-3xl: 4rem;
  --spacing-4xl: 6rem;

  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;
  --radius-full: 9999px;

  --shadow-sm: 0 1px 3px rgba(0,0,0,0.08);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.1);
  --shadow-lg: 0 8px 24px rgba(0,0,0,0.12);
  --shadow-xl: 0 16px 48px rgba(0,0,0,0.15);

  --transition: 0.25s ease;
  --max-width: 1200px;
}

/* ===== 重置与基础样式 ===== */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  line-height: 1.7;
  color: var(--color-text);
  background-color: var(--color-white);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

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

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

ul, ol {
  list-style: none;
}

button {
  cursor: pointer;
  border: none;
  background: none;
  font-family: var(--font-family);
}

/* ===== 无障碍 ===== */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0,0,0,0);
  white-space: nowrap;
  border: 0;
}

:focus-visible {
  outline: 2px solid var(--color-secondary);
  outline-offset: 2px;
}

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

/* ===== 按钮系统 ===== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
  padding: 0.625rem 1.5rem;
  border-radius: var(--radius-md);
  font-size: var(--font-size-base);
  font-weight: 600;
  line-height: 1.5;
  text-decoration: none;
  transition: all var(--transition);
  white-space: nowrap;
  cursor: pointer;
  border: 2px solid transparent;
}

.btn-primary {
  background: var(--color-secondary);
  color: var(--color-white);
  border-color: var(--color-secondary);
}

.btn-primary:hover {
  background: #088a8d;
  border-color: #088a8d;
  color: var(--color-white);
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

.btn-outline {
  background: transparent;
  color: var(--color-white);
  border-color: rgba(255,255,255,0.6);
}

.btn-outline:hover {
  background: rgba(255,255,255,0.15);
  border-color: var(--color-white);
  color: var(--color-white);
}

.btn-outline-dark {
  background: transparent;
  color: var(--color-primary);
  border-color: var(--color-primary);
}

.btn-outline-dark:hover {
  background: var(--color-primary);
  color: var(--color-white);
}

.btn-white {
  background: var(--color-white);
  color: var(--color-primary);
  border-color: var(--color-white);
}

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

.btn-outline-white {
  background: transparent;
  color: var(--color-white);
  border-color: rgba(255,255,255,0.7);
}

.btn-outline-white:hover {
  background: rgba(255,255,255,0.15);
  border-color: var(--color-white);
  color: var(--color-white);
}

.btn-lg {
  padding: 0.875rem 2rem;
  font-size: var(--font-size-lg);
  border-radius: var(--radius-lg);
}

/* ===== 顶部公告栏 ===== */
.top-notice {
  background: var(--color-primary);
  color: var(--color-white);
  text-align: center;
  padding: 0.5rem var(--spacing-md);
  font-size: var(--font-size-sm);
  font-weight: 500;
}

.top-notice .container {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
}

.notice-badge {
  background: var(--color-secondary);
  color: var(--color-white);
  padding: 0.125rem 0.5rem;
  border-radius: var(--radius-full);
  font-size: var(--font-size-xs);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

/* ===== 导航栏 ===== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: var(--color-white);
  border-bottom: 1px solid var(--color-border);
  box-shadow: var(--shadow-sm);
}

.navbar {
  padding: 0;
}

.nav-container {
  display: flex;
  align-items: center;
  height: 68px;
  gap: var(--spacing-xl);
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  text-decoration: none;
  flex-shrink: 0;
}

.nav-logo .logo-icon {
  width: 36px;
  height: 36px;
}

.logo-text {
  font-size: var(--font-size-lg);
  font-weight: 700;
  color: var(--color-primary);
  white-space: nowrap;
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
  flex: 1;
}

.nav-link {
  display: flex;
  align-items: center;
  gap: 4px;
  padding: 0.5rem 0.875rem;
  color: var(--color-text);
  font-size: var(--font-size-sm);
  font-weight: 500;
  border-radius: var(--radius-md);
  transition: all var(--transition);
  white-space: nowrap;
}

.nav-link:hover,
.nav-link.active {
  color: var(--color-secondary);
  background: rgba(10, 147, 150, 0.06);
}

.arrow-icon {
  width: 10px;
  height: 6px;
  transition: transform var(--transition);
}

.has-dropdown {
  position: relative;
}

.has-dropdown:hover .arrow-icon {
  transform: rotate(180deg);
}

.dropdown-menu {
  position: absolute;
  top: calc(100% + 8px);
  left: 0;
  min-width: 240px;
  background: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  padding: var(--spacing-sm);
  opacity: 0;
  visibility: hidden;
  transform: translateY(-8px);
  transition: all var(--transition);
  z-index: 100;
}

.has-dropdown:hover .dropdown-menu {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.dropdown-item {
  display: block;
  padding: 0.5rem 0.875rem;
  color: var(--color-text);
  font-size: var(--font-size-sm);
  border-radius: var(--radius-md);
  transition: all var(--transition);
}

.dropdown-item:hover {
  background: var(--color-bg);
  color: var(--color-secondary);
}

.nav-cta {
  flex-shrink: 0;
}

.mobile-menu-btn {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 8px;
  border-radius: var(--radius-md);
}

.hamburger-line {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--color-text);
  border-radius: 2px;
  transition: all var(--transition);
}

/* ===== 轮播图 ===== */
.hero-slider {
  position: relative;
  overflow: hidden;
  background: var(--color-primary);
}

.slider-container {
  position: relative;
  height: 580px;
}

.slide {
  position: absolute;
  inset: 0;
  opacity: 0;
  transition: opacity 0.7s ease;
}

.slide.active {
  opacity: 1;
  z-index: 1;
}

.slide-image {
  position: absolute;
  inset: 0;
}

.slide-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
}

.slide-image::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(90deg, rgba(15,43,70,0.85) 0%, rgba(15,43,70,0.5) 50%, rgba(15,43,70,0.2) 100%);
}

.slide-content {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  z-index: 2;
}

.slide-badge {
  display: inline-block;
  background: rgba(10, 147, 150, 0.9);
  color: var(--color-white);
  padding: 0.25rem 0.875rem;
  border-radius: var(--radius-full);
  font-size: var(--font-size-xs);
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  margin-bottom: var(--spacing-lg);
}

.slide-title {
  font-size: clamp(2rem, 4vw, 3.5rem);
  font-weight: 800;
  color: var(--color-white);
  line-height: 1.2;
  margin-bottom: var(--spacing-lg);
  max-width: 600px;
}

.slide-title strong {
  color: var(--color-accent-light);
}

.slide-desc {
  font-size: var(--font-size-lg);
  color: rgba(255,255,255,0.88);
  max-width: 520px;
  margin-bottom: var(--spacing-xl);
  line-height: 1.7;
}

.slide-actions {
  display: flex;
  gap: var(--spacing-md);
  flex-wrap: wrap;
  margin-bottom: var(--spacing-xl);
}

.slide-stats {
  display: flex;
  align-items: center;
  gap: var(--spacing-xl);
}

.stat-item {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.stat-item strong {
  font-size: var(--font-size-2xl);
  font-weight: 800;
  color: var(--color-white);
  line-height: 1;
}

.stat-item span {
  font-size: var(--font-size-xs);
  color: rgba(255,255,255,0.7);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.stat-divider {
  width: 1px;
  height: 40px;
  background: rgba(255,255,255,0.25);
}

/* 轮播控制按钮 */
.slider-btn {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  z-index: 10;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: rgba(255,255,255,0.15);
  backdrop-filter: blur(8px);
  border: 1px solid rgba(255,255,255,0.3);
  color: var(--color-white);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition);
}

.slider-btn:hover {
  background: rgba(255,255,255,0.3);
  transform: translateY(-50%) scale(1.05);
}

.slider-btn svg {
  width: 20px;
  height: 20px;
}

.slider-prev {
  left: var(--spacing-xl);
}

.slider-next {
  right: var(--spacing-xl);
}

/* 轮播指示器 */
.slider-dots {
  position: absolute;
  bottom: var(--spacing-xl);
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  gap: var(--spacing-sm);
  z-index: 10;
}

.dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: rgba(255,255,255,0.4);
  transition: all var(--transition);
  padding: 0;
}

.dot.active {
  background: var(--color-white);
  width: 28px;
  border-radius: var(--radius-full);
}

/* ===== 信任带 ===== */
.trust-bar {
  background: var(--color-primary);
  padding: var(--spacing-xl) 0;
  border-top: 1px solid rgba(255,255,255,0.08);
}

.trust-items {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-2xl);
  flex-wrap: wrap;
}

.trust-item {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
}

.trust-icon {
  width: 28px;
  height: 28px;
  color: var(--color-secondary);
  flex-shrink: 0;
}

.trust-text {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.trust-text strong {
  font-size: var(--font-size-lg);
  font-weight: 700;
  color: var(--color-white);
  line-height: 1;
}

.trust-text span {
  font-size: var(--font-size-xs);
  color: rgba(255,255,255,0.6);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.trust-divider {
  width: 1px;
  height: 36px;
  background: rgba(255,255,255,0.12);
}

/* ===== 通用区块样式 ===== */
.section-header {
  text-align: center;
  margin-bottom: var(--spacing-3xl);
}

.section-badge {
  display: inline-block;
  background: rgba(10, 147, 150, 0.1);
  color: var(--color-secondary);
  padding: 0.25rem 0.875rem;
  border-radius: var(--radius-full);
  font-size: var(--font-size-xs);
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  margin-bottom: var(--spacing-md);
}

.section-badge.light {
  background: rgba(255,255,255,0.15);
  color: var(--color-white);
}

.section-title {
  font-size: clamp(1.75rem, 3vw, 2.5rem);
  font-weight: 800;
  color: var(--color-primary);
  line-height: 1.25;
  margin-bottom: var(--spacing-md);
}

.section-desc {
  font-size: var(--font-size-lg);
  color: var(--color-text-light);
  max-width: 600px;
  margin: 0 auto;
  line-height: 1.7;
}

.section-footer {
  text-align: center;
  margin-top: var(--spacing-2xl);
}

/* ===== 功能模块 ===== */
.features-section {
  padding: var(--spacing-4xl) 0;
  background: var(--color-bg);
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--spacing-xl);
}

.feature-card {
  background: var(--color-white);
  border-radius: var(--radius-xl);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--color-border);
  transition: all var(--transition);
}

.feature-card:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-4px);
  border-color: rgba(10, 147, 150, 0.2);
}

.feature-img-wrap {
  position: relative;
  overflow: hidden;
  aspect-ratio: 4/3;
}

.feature-img-wrap img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.4s ease;
}

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

.feature-tag {
  position: absolute;
  top: var(--spacing-md);
  left: var(--spacing-md);
  background: var(--color-secondary);
  color: var(--color-white);
  padding: 0.2rem 0.625rem;
  border-radius: var(--radius-full);
  font-size: var(--font-size-xs);
  font-weight: 600;
}

.feature-body {
  padding: var(--spacing-xl);
}

.feature-title {
  font-size: var(--font-size-xl);
  font-weight: 700;
  margin-bottom: var(--spacing-md);
  line-height: 1.3;
}

.feature-title a {
  color: var(--color-primary);
}

.feature-title a:hover {
  color: var(--color-secondary);
}

.feature-desc {
  color: var(--color-text-light);
  font-size: var(--font-size-sm);
  line-height: 1.7;
  margin-bottom: var(--spacing-md);
}

.feature-list {
  margin-bottom: var(--spacing-lg);
}

.feature-list li {
  position: relative;
  padding-left: 1.25rem;
  font-size: var(--font-size-sm);
  color: var(--color-text-light);
  margin-bottom: var(--spacing-xs);
  line-height: 1.6;
}

.feature-list li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0.5em;
  width: 6px;
  height: 6px;
  background: var(--color-secondary);
  border-radius: 50%;
}

.feature-link {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  color: var(--color-secondary);
  font-size: var(--font-size-sm);
  font-weight: 600;
}

.feature-link:hover {
  gap: 8px;
}

.feature-link svg {
  width: 14px;
  height: 14px;
  transition: transform var(--transition);
}

.feature-link:hover svg {
  transform: translateX(3px);
}

/* ===== 产品优势 ===== */
.advantages-section {
  padding: var(--spacing-4xl) 0;
  background: var(--color-white);
}

.advantages-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--spacing-xl);
}

.advantage-item {
  text-align: center;
  padding: var(--spacing-xl);
  border-radius: var(--radius-xl);
  transition: all var(--transition);
}

.advantage-item:hover {
  background: var(--color-bg);
  box-shadow: var(--shadow-md);
}

.advantage-icon {
  width: 64px;
  height: 64px;
  margin: 0 auto var(--spacing-lg);
}

.advantage-icon svg {
  width: 100%;
  height: 100%;
}

.advantage-item h3 {
  font-size: var(--font-size-base);
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: var(--spacing-sm);
  line-height: 1.4;
}

.advantage-item p {
  font-size: var(--font-size-sm);
  color: var(--color-text-light);
  line-height: 1.7;
}

/* ===== 下载区域 ===== */
.download-section {
  padding: var(--spacing-4xl) 0;
  background: var(--color-bg-alt);
}

.download-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-3xl);
  align-items: center;
}

.download-text h2 {
  font-size: clamp(1.75rem, 3vw, 2.5rem);
  font-weight: 800;
  color: var(--color-primary);
  margin-bottom: var(--spacing-md);
  line-height: 1.25;
}

.download-text p {
  color: var(--color-text-light);
  font-size: var(--font-size-lg);
  margin-bottom: var(--spacing-xl);
  line-height: 1.7;
}

.download-platforms {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-md);
}

.platform-btn {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  padding: var(--spacing-md) var(--spacing-lg);
  background: var(--color-primary);
  color: var(--color-white);
  border-radius: var(--radius-lg);
  text-decoration: none;
  transition: all var(--transition);
  border: 2px solid var(--color-primary);
}

.platform-btn:hover {
  background: var(--color-secondary);
  border-color: var(--color-secondary);
  color: var(--color-white);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.platform-btn svg {
  width: 24px;
  height: 24px;
  flex-shrink: 0;
}

.platform-sub {
  display: block;
  font-size: var(--font-size-xs);
  opacity: 0.75;
  line-height: 1;
  margin-bottom: 2px;
}

.platform-name {
  display: block;
  font-size: var(--font-size-sm);
  font-weight: 700;
  line-height: 1;
}

.download-image img {
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-xl);
  width: 100%;
}

/* ===== 用户评价 ===== */
.testimonials-section {
  padding: var(--spacing-4xl) 0;
  background: var(--color-white);
}

.testimonials-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--spacing-xl);
}

.testimonial-card {
  background: var(--color-bg);
  border-radius: var(--radius-xl);
  padding: var(--spacing-xl);
  border: 1px solid var(--color-border);
  transition: all var(--transition);
}

.testimonial-card:hover {
  box-shadow: var(--shadow-lg);
  border-color: rgba(10, 147, 150, 0.2);
  transform: translateY(-3px);
}

.testimonial-stars {
  display: flex;
  gap: 2px;
  margin-bottom: var(--spacing-md);
}

.testimonial-stars svg {
  width: 16px;
  height: 16px;
}

.testimonial-card p {
  color: var(--color-text);
  font-size: var(--font-size-base);
  line-height: 1.7;
  margin-bottom: var(--spacing-lg);
  font-style: italic;
}

.testimonial-author {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
}

.testimonial-author cite {
  font-style: normal;
}

.testimonial-author strong {
  display: block;
  font-size: var(--font-size-sm);
  font-weight: 700;
  color: var(--color-primary);
}

.testimonial-author span {
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
}

/* ===== 博客区域 ===== */
.blog-section {
  padding: var(--spacing-4xl) 0;
  background: var(--color-bg);
}

.blog-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--spacing-xl);
}

.blog-card {
  background: var(--color-white);
  border-radius: var(--radius-xl);
  overflow: hidden;
  border: 1px solid var(--color-border);
  transition: all var(--transition);
}

.blog-card:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-4px);
  border-color: rgba(10, 147, 150, 0.2);
}

.blog-card-link {
  display: block;
  text-decoration: none;
}

.blog-img-wrap {
  position: relative;
  overflow: hidden;
  aspect-ratio: 16/9;
}

.blog-img-wrap img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.4s ease;
}

.blog-card:hover .blog-img-wrap img {
  transform: scale(1.04);
}

.blog-category {
  position: absolute;
  top: var(--spacing-md);
  left: var(--spacing-md);
  background: var(--color-secondary);
  color: var(--color-white);
  padding: 0.2rem 0.625rem;
  border-radius: var(--radius-full);
  font-size: var(--font-size-xs);
  font-weight: 600;
}

.blog-body {
  padding: var(--spacing-lg);
}

.blog-meta {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-sm);
}

.blog-meta time {
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
}

.blog-read-time {
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
  padding-left: var(--spacing-md);
  border-left: 1px solid var(--color-border);
}

.blog-title {
  font-size: var(--font-size-base);
  font-weight: 700;
  line-height: 1.4;
  margin-bottom: var(--spacing-sm);
}

.blog-title a {
  color: var(--color-primary);
}

.blog-title a:hover {
  color: var(--color-secondary);
}

.blog-excerpt {
  font-size: var(--font-size-sm);
  color: var(--color-text-light);
  line-height: 1.6;
  margin-bottom: var(--spacing-md);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.blog-more {
  font-size: var(--font-size-sm);
  font-weight: 600;
  color: var(--color-secondary);
}

.blog-more:hover {
  color: var(--color-accent);
}

/* ===== FAQ区域 ===== */
.faq-section {
  padding: var(--spacing-4xl) 0;
  background: var(--color-white);
}

.faq-grid {
  max-width: 800px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

.faq-item {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: all var(--transition);
}

.faq-item:hover {
  border-color: rgba(10, 147, 150, 0.3);
}

.faq-question {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--spacing-lg) var(--spacing-xl);
  text-align: left;
  font-size: var(--font-size-base);
  font-weight: 600;
  color: var(--color-primary);
  background: var(--color-white);
  transition: all var(--transition);
  gap: var(--spacing-md);
}

.faq-question:hover {
  background: var(--color-bg);
  color: var(--color-secondary);
}

.faq-question[aria-expanded="true"] {
  background: rgba(10, 147, 150, 0.05);
  color: var(--color-secondary);
}

.faq-icon {
  width: 20px;
  height: 20px;
  flex-shrink: 0;
  transition: transform var(--transition);
}

.faq-question[aria-expanded="true"] .faq-icon {
  transform: rotate(180deg);
}

.faq-answer {
  padding: 0 var(--spacing-xl);
  max-height: 0;
  overflow: hidden;
  transition: all 0.3s ease;
}

.faq-answer.open {
  padding: 0 var(--spacing-xl) var(--spacing-lg);
  max-height: 300px;
}

.faq-answer p {
  color: var(--color-text-light);
  font-size: var(--font-size-sm);
  line-height: 1.7;
}

/* ===== CTA区域 ===== */
.cta-section {
  padding: var(--spacing-4xl) 0;
  background: linear-gradient(135deg, var(--color-primary) 0%, #1a4a6e 100%);
  text-align: center;
}

.cta-content h2 {
  font-size: clamp(1.75rem, 3vw, 2.5rem);
  font-weight: 800;
  color: var(--color-white);
  margin-bottom: var(--spacing-md);
}

.cta-content p {
  font-size: var(--font-size-lg);
  color: rgba(255,255,255,0.8);
  max-width: 560px;
  margin: 0 auto var(--spacing-xl);
  line-height: 1.7;
}

.cta-actions {
  display: flex;
  gap: var(--spacing-md);
  justify-content: center;
  flex-wrap: wrap;
}

/* ===== 页脚 ===== */
.site-footer {
  background: var(--color-primary);
  color: rgba(255,255,255,0.8);
  padding: var(--spacing-3xl) 0 0;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: var(--spacing-2xl);
  padding-bottom: var(--spacing-2xl);
  border-bottom: 1px solid rgba(255,255,255,0.1);
}

.footer-logo {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  text-decoration: none;
  margin-bottom: var(--spacing-md);
}

.footer-logo .logo-icon {
  width: 32px;
  height: 32px;
}

.footer-logo span {
  font-size: var(--font-size-lg);
  font-weight: 700;
  color: var(--color-white);
}

.footer-desc {
  font-size: var(--font-size-sm);
  line-height: 1.7;
  margin-bottom: var(--spacing-lg);
  color: rgba(255,255,255,0.65);
}

.footer-social {
  display: flex;
  gap: var(--spacing-sm);
}

.social-link {
  padding: 0.375rem 0.75rem;
  background: rgba(255,255,255,0.08);
  color: rgba(255,255,255,0.7);
  border-radius: var(--radius-md);
  font-size: var(--font-size-xs);
  font-weight: 500;
  transition: all var(--transition);
}

.social-link:hover {
  background: var(--color-secondary);
  color: var(--color-white);
}

.footer-nav-title {
  font-size: var(--font-size-sm);
  font-weight: 700;
  color: var(--color-white);
  margin-bottom: var(--spacing-lg);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.footer-nav ul {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

.footer-nav a {
  font-size: var(--font-size-sm);
  color: rgba(255,255,255,0.6);
  transition: color var(--transition);
}

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

.footer-bottom {
  padding: var(--spacing-lg) 0;
  display: flex;
  flex-direction: column;
  gap: var(--spacing-xs);
}

.footer-copyright {
  font-size: var(--font-size-xs);
  color: rgba(255,255,255,0.5);
}

.footer-copyright a {
  color: rgba(255,255,255,0.5);
}

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

.footer-seo-text {
  font-size: var(--font-size-xs);
  color: rgba(255,255,255,0.3);
  line-height: 1.5;
}

/* ===== 返回顶部 ===== */
.back-to-top {
  position: fixed;
  bottom: var(--spacing-xl);
  right: var(--spacing-xl);
  width: 44px;
  height: 44px;
  background: var(--color-secondary);
  color: var(--color-white);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-lg);
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition: all var(--transition);
  z-index: 999;
}

.back-to-top.visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.back-to-top:hover {
  background: var(--color-primary);
  transform: translateY(-2px);
}

.back-to-top svg {
  width: 18px;
  height: 18px;
}

/* ===== 面包屑 ===== */
.breadcrumb {
  padding: var(--spacing-md) 0;
  background: var(--color-bg);
  border-bottom: 1px solid var(--color-border);
}

.breadcrumb-list {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
  flex-wrap: wrap;
}

.breadcrumb-item {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
}

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

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

.breadcrumb-item.active {
  color: var(--color-text);
  font-weight: 500;
}

.breadcrumb-separator {
  color: var(--color-text-muted);
  font-size: var(--font-size-xs);
}

/* ===== 分页 ===== */
.pagination {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-xs);
  padding: var(--spacing-2xl) 0;
}

.page-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: var(--radius-md);
  font-size: var(--font-size-sm);
  font-weight: 500;
  color: var(--color-text);
  background: var(--color-white);
  border: 1px solid var(--color-border);
  transition: all var(--transition);
  text-decoration: none;
}

.page-btn:hover,
.page-btn.active {
  background: var(--color-secondary);
  border-color: var(--color-secondary);
  color: var(--color-white);
}

/* ===== 列表页特有样式 ===== */
.page-hero {
  background: linear-gradient(135deg, var(--color-primary) 0%, #1a4a6e 100%);
  padding: var(--spacing-3xl) 0;
  text-align: center;
}

.page-hero h1 {
  font-size: clamp(1.75rem, 3vw, 2.5rem);
  font-weight: 800;
  color: var(--color-white);
  margin-bottom: var(--spacing-md);
}

.page-hero p {
  font-size: var(--font-size-lg);
  color: rgba(255,255,255,0.8);
  max-width: 560px;
  margin: 0 auto;
}

.list-section {
  padding: var(--spacing-3xl) 0;
  background: var(--color-bg);
}

.list-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--spacing-xl);
  margin-bottom: var(--spacing-2xl);
}

/* ===== 内容页特有样式 ===== */
.article-layout {
  display: grid;
  grid-template-columns: 1fr 320px;
  gap: var(--spacing-2xl);
  padding: var(--spacing-2xl) 0;
}

.article-main {
  min-width: 0;
}

.article-header {
  margin-bottom: var(--spacing-xl);
}

.article-category {
  display: inline-block;
  background: rgba(10, 147, 150, 0.1);
  color: var(--color-secondary);
  padding: 0.25rem 0.75rem;
  border-radius: var(--radius-full);
  font-size: var(--font-size-xs);
  font-weight: 600;
  margin-bottom: var(--spacing-md);
}

.article-title {
  font-size: clamp(1.5rem, 2.5vw, 2rem);
  font-weight: 800;
  color: var(--color-primary);
  line-height: 1.3;
  margin-bottom: var(--spacing-md);
}

.article-meta {
  display: flex;
  align-items: center;
  gap: var(--spacing-lg);
  color: var(--color-text-muted);
  font-size: var(--font-size-sm);
  padding-bottom: var(--spacing-lg);
  border-bottom: 1px solid var(--color-border);
}

.article-featured-img {
  width: 100%;
  border-radius: var(--radius-xl);
  margin-bottom: var(--spacing-xl);
  box-shadow: var(--shadow-md);
}

.article-content {
  font-size: var(--font-size-base);
  line-height: 1.8;
  color: var(--color-text);
}

.article-content h2 {
  font-size: var(--font-size-2xl);
  font-weight: 700;
  color: var(--color-primary);
  margin: var(--spacing-xl) 0 var(--spacing-md);
}

.article-content h3 {
  font-size: var(--font-size-xl);
  font-weight: 700;
  color: var(--color-primary);
  margin: var(--spacing-lg) 0 var(--spacing-sm);
}

.article-content p {
  margin-bottom: var(--spacing-md);
}

.article-content ul,
.article-content ol {
  padding-left: var(--spacing-xl);
  margin-bottom: var(--spacing-md);
  list-style: disc;
}

.article-content li {
  margin-bottom: var(--spacing-xs);
}

.article-content img {
  border-radius: var(--radius-lg);
  margin: var(--spacing-lg) 0;
  box-shadow: var(--shadow-md);
}

.article-content a {
  color: var(--color-secondary);
  text-decoration: underline;
}

/* 侧边栏 */
.sidebar {
  position: sticky;
  top: 80px;
  height: fit-content;
}

.sidebar-widget {
  background: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: var(--spacing-xl);
  margin-bottom: var(--spacing-lg);
}

.sidebar-widget-title {
  font-size: var(--font-size-base);
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: var(--spacing-lg);
  padding-bottom: var(--spacing-sm);
  border-bottom: 2px solid var(--color-secondary);
}

.sidebar-list {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
}

.sidebar-list-item {
  display: flex;
  gap: var(--spacing-md);
  align-items: flex-start;
}

.sidebar-list-item img {
  width: 72px;
  height: 54px;
  object-fit: cover;
  border-radius: var(--radius-md);
  flex-shrink: 0;
}

.sidebar-list-item-title {
  font-size: var(--font-size-sm);
  font-weight: 600;
  color: var(--color-primary);
  line-height: 1.4;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.sidebar-list-item-title:hover {
  color: var(--color-secondary);
}

.sidebar-list-item-date {
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
  margin-top: 2px;
}

/* ===== 下载页特有样式 ===== */
.download-hero {
  background: linear-gradient(135deg, var(--color-primary) 0%, #1a4a6e 100%);
  padding: var(--spacing-3xl) 0;
}

.download-hero-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-2xl);
  align-items: center;
}

.download-hero h1 {
  font-size: clamp(1.75rem, 3vw, 2.5rem);
  font-weight: 800;
  color: var(--color-white);
  margin-bottom: var(--spacing-md);
}

.download-hero p {
  color: rgba(255,255,255,0.8);
  font-size: var(--font-size-lg);
  margin-bottom: var(--spacing-xl);
}

.download-version-info {
  display: flex;
  gap: var(--spacing-xl);
  margin-bottom: var(--spacing-xl);
}

.version-badge {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.version-badge span:first-child {
  font-size: var(--font-size-xs);
  color: rgba(255,255,255,0.6);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.version-badge strong {
  font-size: var(--font-size-base);
  color: var(--color-white);
  font-weight: 700;
}

.download-main-btn {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-md);
  padding: var(--spacing-lg) var(--spacing-2xl);
  background: var(--color-secondary);
  color: var(--color-white);
  border-radius: var(--radius-lg);
  font-size: var(--font-size-lg);
  font-weight: 700;
  text-decoration: none;
  transition: all var(--transition);
  box-shadow: var(--shadow-lg);
}

.download-main-btn:hover {
  background: #088a8d;
  color: var(--color-white);
  transform: translateY(-2px);
  box-shadow: var(--shadow-xl);
}

.download-main-btn svg {
  width: 24px;
  height: 24px;
}

.download-platforms-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--spacing-lg);
  padding: var(--spacing-2xl) 0;
}

.download-platform-card {
  background: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: var(--spacing-xl);
  text-align: center;
  transition: all var(--transition);
}

.download-platform-card:hover {
  box-shadow: var(--shadow-lg);
  border-color: rgba(10, 147, 150, 0.3);
  transform: translateY(-3px);
}

.download-platform-card svg {
  width: 48px;
  height: 48px;
  margin: 0 auto var(--spacing-md);
  color: var(--color-primary);
}

.download-platform-card h3 {
  font-size: var(--font-size-base);
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: var(--spacing-sm);
}

.download-platform-card p {
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
  margin-bottom: var(--spacing-lg);
}

.download-platform-card .btn {
  width: 100%;
}

/* ===== 响应式设计 ===== */
@media (max-width: 1024px) {
  .features-grid,
  .testimonials-grid,
  .blog-grid,
  .list-grid {
    grid-template-columns: repeat(2, 1fr);
  }

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

  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-xl);
  }

  .article-layout {
    grid-template-columns: 1fr;
  }

  .sidebar {
    position: static;
  }

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

@media (max-width: 768px) {
  .container {
    padding: 0 var(--spacing-md);
  }

  .nav-menu,
  .nav-cta {
    display: none;
  }

  .mobile-menu-btn {
    display: flex;
  }

  .slider-container {
    height: 420px;
  }

  .slide-title {
    font-size: 1.75rem;
  }

  .slide-stats {
    display: none;
  }

  .trust-items {
    gap: var(--spacing-lg);
  }

  .trust-divider {
    display: none;
  }

  .features-grid,
  .testimonials-grid,
  .blog-grid,
  .list-grid {
    grid-template-columns: 1fr;
  }

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

  .download-content {
    grid-template-columns: 1fr;
  }

  .download-image {
    display: none;
  }

  .download-platforms {
    grid-template-columns: 1fr;
  }

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

  .download-hero-content {
    grid-template-columns: 1fr;
  }

  .download-platforms-grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 480px) {
  .slide-actions {
    flex-direction: column;
  }

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

  .cta-actions {
    flex-direction: column;
    align-items: center;
  }

  .download-platforms-grid {
    grid-template-columns: 1fr;
  }
}

/* ===== 打印样式 ===== */
@media print {
  .site-header,
  .hero-slider,
  .trust-bar,
  .cta-section,
  .site-footer,
  .back-to-top {
    display: none;
  }
}