/* ==========================================================================
   EliteDrive Website - Components
   组件样式：导航、按钮、卡片、表单等
   ========================================================================== */

/* ==========================================================================
   Navigation（导航）
   ========================================================================== */

.navbar {
  position: sticky;
  top: 0;
  z-index: 1000;
  background-color: var(--color-bg-glass);
  backdrop-filter: blur(var(--backdrop-blur));
  -webkit-backdrop-filter: blur(var(--backdrop-blur));
  border-bottom: 1px solid var(--color-border-light);
  padding: var(--spacing-sm) 0;
  transition: background-color var(--transition-base);
}

.navbar-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

.navbar-brand {
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--color-accent);
  display: flex;
  align-items: center;
  flex-shrink: 0;
}

.navbar-logo {
  height: 32px;
  width: auto;
  max-width: 100%;
  object-fit: contain;
}

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

.nav-link {
  color: var(--color-text);
  font-size: 0.875rem;
  transition: color var(--transition-base);
}

.nav-link:hover {
  color: var(--color-primary);
  opacity: 1;
}

/* 移动端菜单按钮 */
.navbar-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--spacing-xs);
  width: 44px;
  height: 44px;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}

.navbar-toggle-icon,
.navbar-toggle-icon::before,
.navbar-toggle-icon::after {
  display: block;
  width: 24px;
  height: 2px;
  background-color: var(--color-text);
  border-radius: 2px;
  transition: all 0.3s ease;
}

.navbar-toggle-icon {
  position: relative;
}

.navbar-toggle-icon::before,
.navbar-toggle-icon::after {
  content: '';
  position: absolute;
  left: 0;
}

.navbar-toggle-icon::before { top: -7px; }
.navbar-toggle-icon::after { top: 7px; }

.navbar-toggle.active .navbar-toggle-icon {
  background-color: transparent;
}

.navbar-toggle.active .navbar-toggle-icon::before {
  top: 0;
  transform: rotate(45deg);
}

.navbar-toggle.active .navbar-toggle-icon::after {
  top: 0;
  transform: rotate(-45deg);
}

/* 语言切换器 */
.language-switcher {
  position: relative;
}

.language-switcher > .nav-link {
  cursor: pointer;
}

.language-dropdown {
  display: none;
  position: absolute;
  top: 100%;
  right: 0;
  background: white;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-md);
  min-width: 120px;
  padding: var(--spacing-xs) 0;
  z-index: 1001;
}

.language-dropdown::before {
  content: '';
  position: absolute;
  top: -10px;
  left: 0;
  right: 0;
  height: 10px;
}

.language-switcher:hover .language-dropdown {
  display: block;
}

.language-option {
  display: block;
  padding: var(--spacing-xs) var(--spacing-sm);
  color: var(--color-text);
  font-size: 0.875rem;
  transition: background-color var(--transition-base);
}

.language-option:hover {
  background-color: var(--color-bg-secondary);
  opacity: 1;
}

/* ==========================================================================
   Buttons（按钮）
   ========================================================================== */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 32px;
  border-radius: var(--radius-full);
  font-size: 1rem;
  font-weight: var(--font-weight-medium);
  text-align: center;
  cursor: pointer;
  transition: all var(--transition-fast);
  border: none;
  text-decoration: none;
  white-space: nowrap !important;
  min-width: max-content;
}

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

.btn-primary:hover {
  background-color: var(--color-primary-hover);
  opacity: 1;
}

.btn-secondary {
  background-color: transparent;
  color: var(--color-primary);
  border: 2px solid var(--color-primary);
}

.btn-secondary:hover {
  background-color: var(--color-primary);
  color: white;
  opacity: 1;
}

.btn-lg {
  padding: 16px 48px;
  font-size: 1.125rem;
}

.btn-group,
.hero-actions {
  display: flex;
  gap: var(--spacing-sm);
  justify-content: center;
  flex-wrap: wrap;
}

/* 小按钮 - 用于卡片内 */
.btn-sm {
  padding: 8px 20px;
  font-size: 0.875rem;
}

/* ==========================================================================
   Hero（首屏）
   ========================================================================== */

.hero {
  text-align: center;
  padding: var(--spacing-xl) 0;
  background: linear-gradient(135deg, var(--color-bg-secondary) 0%, var(--color-bg) 100%);
}

.hero-title {
  font-size: 4rem;
  font-weight: 700;
  margin-bottom: var(--spacing-sm);
  color: var(--color-accent);
  letter-spacing: -0.02em;
}

.hero-subtitle {
  font-size: 1.75rem;
  font-weight: 400;
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-md);
}

.hero-description {
  font-size: 1.25rem;
  color: var(--color-text-secondary);
  max-width: 700px;
  margin: 0 auto var(--spacing-lg);
}

/* 返回链接 */
.back-link {
  display: inline-block;
  margin-bottom: var(--spacing-md);
  color: var(--color-text-secondary);
  text-decoration: none;
  font-size: 1rem;
  transition: color var(--transition-base);
  font-weight: var(--font-weight-medium);
}

.back-link:hover {
  color: var(--color-primary);
  opacity: 1;
}

/* Hero 中的返回链接（深色背景） */
.hero .back-link {
  color: var(--color-text);
}

.hero .back-link:hover {
  color: var(--color-primary);
}

/* ==========================================================================
   Sections（区块）
   ========================================================================== */

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

.section-gray {
  background-color: var(--color-bg-secondary);
}

.section-title {
  text-align: center;
  margin-bottom: var(--spacing-lg);
}

.section-title h2 {
  font-size: 2.5rem;
  margin-bottom: var(--spacing-xs);
}

.section-title p {
  font-size: 1.125rem;
  color: var(--color-text-secondary);
}

/* CTA 区块 */
.cta-section {
  text-align: center;
  padding: 0;
}

.cta-section h2 {
  font-size: 2.5rem;
  margin-bottom: var(--spacing-md);
}

.cta-section p {
  font-size: 1.25rem;
  margin-bottom: var(--spacing-lg);
  color: var(--color-text-secondary);
}

/* ==========================================================================
   Footer（页脚）
   ========================================================================== */

.footer {
  background: var(--color-bg-secondary);
  padding: var(--spacing-lg) 0;
  text-align: center;
  margin-top: var(--spacing-xl);
}

.footer-content {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

.footer-text {
  color: var(--color-text-secondary);
  font-size: 0.875rem;
  margin-bottom: var(--spacing-sm);
  line-height: 1.6;
}

.footer-text:last-of-type {
  margin-bottom: 0;
}

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

.footer-text a:hover {
  color: var(--color-primary);
  opacity: 1;
}

.footer-disclaimer {
  color: var(--color-text-secondary);
  font-size: 0.75rem;
  margin-top: var(--spacing-md);
  opacity: 0.8;
}

/* ==========================================================================
   Manual Category Grid（使用说明分类卡片）
   ========================================================================== */

.manual-category-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  margin-top: 32px;
  max-width: 1200px;
  margin-left: auto;
  margin-right: auto;
}

.manual-category-card {
  display: flex;
  flex-direction: column;
  background: white;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
  transition: all var(--transition-base);
  border: 1px solid var(--color-border-light);
}

.manual-category-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 16px rgba(0, 0, 0, 0.12);
  border-color: var(--color-primary);
}

.manual-category-image {
  width: 100%;
  aspect-ratio: 1 / 1;
  overflow: hidden;
  background: #f5f5f7;
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 16px;
}

.manual-category-image img {
  width: 100%;
  height: 100%;
  object-fit: contain;
}

.manual-category-info {
  padding: 16px 12px;
  flex: 1;
  display: flex;
  flex-direction: column;
  text-align: center;
}

.manual-category-title {
  font-size: 1rem;
  font-weight: 600;
  color: #1a1a1a;
  margin: 0 0 8px 0;
  line-height: 1.3;
}

.manual-category-desc {
  font-size: 0.8125rem;
  color: #666;
  line-height: 1.5;
  margin: 0 0 12px 0;
  flex: 1;
}

.manual-category-btn {
  display: inline-block;
  padding: 8px 20px;
  border: 2px solid var(--color-primary);
  border-radius: var(--radius-full);
  color: var(--color-primary);
  font-size: 0.875rem;
  font-weight: 500;
  text-decoration: none;
  transition: all 0.3s ease;
  align-self: center;
}

.manual-category-btn:hover {
  background-color: var(--color-primary);
  color: white;
  opacity: 1;
}

.manual-category-btn:hover {
  background-color: var(--color-primary);
  color: white;
  opacity: 1;
}

@media (max-width: 768px) {
  .manual-category-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 12px;
    margin-top: 24px;
    max-width: 100%;
  }

  .manual-category-image {
    padding: 16px;
  }

  .manual-category-info {
    padding: 12px;
  }

  .manual-category-title {
    font-size: 0.9375rem;
  }

  .manual-category-desc {
    font-size: 0.8125rem;
    margin-bottom: 10px;
  }

  .manual-category-btn {
    padding: 8px 16px;
    font-size: 0.875rem;
  }
}

@media (max-width: 480px) {
  .manual-category-card {
    border-radius: var(--radius-md);
  }

  .manual-category-image {
    padding: 20px;
  }

  .manual-category-info {
    padding: 16px;
  }

  .manual-category-title {
    font-size: 1rem;
  }
}