/* custom.css - 组件与页面专属样式 (Components & Page Specific Styles) */

/* 1. 导航栏 .site-nav (固定顶部、半透明磨砂) */
.site-nav {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: var(--nav-height);
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  z-index: 1000;
  border-bottom: 1px solid rgba(229, 231, 235, 0.6);
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0 2rem;
  box-shadow: 0 1px 10px rgba(0, 0, 0, 0.05);
}

.site-nav .brand-logo {
  font-size: 1.5rem;
  font-weight: 700;
  background: var(--gradient-bg);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  text-decoration: none;
  letter-spacing: -0.5px;
}

.site-nav-container {
  display: flex;
  align-items: center;
}

.site-nav-links {
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  gap: 2rem;
  list-style: none;
}

.site-nav-links a {
  color: #374151;
  font-weight: 500;
  font-size: 1rem;
  padding: 0.5rem 0;
  position: relative;
  text-decoration: none;
}

.site-nav-links a:hover {
  color: var(--secondary-color);
  text-decoration: none;
}

.site-nav-links a::after {
  content: '';
  position: absolute;
  width: 0;
  height: 2px;
  bottom: 0;
  left: 0;
  background-color: var(--secondary-color);
  transition: width 0.3s ease;
}

.site-nav-links a:hover::after {
  width: 100%;
}

/* 纯 CSS 汉堡菜单 (移动端导航抽屉) */
#site-nav-toggle {
  display: none;
}

.site-nav-toggle-label {
  display: none; /* 默认桌面端隐藏 */
  cursor: pointer;
  flex-direction: column;
  gap: 5px;
  padding: 8px;
  z-index: 1001;
}

.site-nav-toggle-label span {
  display: block;
  width: 24px;
  height: 2px;
  background-color: #374151;
  transition: all 0.3s ease;
}

@media (max-width: 768px) {
  .site-nav-toggle-label {
    display: flex;
  }
  
  .site-nav-links {
    position: absolute;
    top: var(--nav-height);
    left: 0;
    width: 100%;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    flex-direction: column;
    gap: 0;
    max-height: 0;
    overflow: hidden;
    transform: none;
    transition: max-height 0.4s ease-in-out, box-shadow 0.3s ease;
    border-bottom: 1px solid var(--border-color);
  }

  /* 下拉展开菜单 */
  #site-nav-toggle:checked ~ .site-nav-links {
    max-height: 400px;
    box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
  }

  /* 汉堡图标变叉号 */
  #site-nav-toggle:checked ~ .site-nav-toggle-label span:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
  }
  #site-nav-toggle:checked ~ .site-nav-toggle-label span:nth-child(2) {
    opacity: 0;
  }
  #site-nav-toggle:checked ~ .site-nav-toggle-label span:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
  }

  .site-nav-links li {
    width: 100%;
  }

  .site-nav-links a {
    display: block;
    padding: 1rem 2rem;
    border-bottom: 1px solid #f3f4f6;
  }
  .site-nav-links a::after {
    display: none; /* 移动端去底边动画 */
  }
}

/* 2. Page Header (Cayman 风格渐变 Hero) */
.page-header {
  background: var(--gradient-bg);
  color: #ffffff;
  text-align: center;
  padding: 8rem 2rem 5rem; /* 留出导航栏空间 */
  margin: 0;
}

.page-header h1 {
  font-size: 2.5rem;
  font-weight: 700;
  margin-bottom: 1rem;
  color: #ffffff;
  text-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.page-header .tagline {
  font-size: 1.25rem;
  opacity: 0.9;
  font-weight: 300;
  max-width: 600px;
  margin: 0 auto;
}

/* 3. 栅格卡片布局 .quick-picks 与 .quick-pick */
.quick-picks {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 2rem;
  margin: 3rem 0;
}

.quick-pick {
  background: var(--card-bg);
  border-radius: var(--radius-lg);
  padding: 2rem;
  box-shadow: var(--card-shadow);
  border: 1px solid var(--border-color);
  position: relative;
  transition: transform 0.3s ease, box-shadow 0.3s ease;
  display: flex;
  flex-direction: column;
}

.quick-pick:hover {
  transform: translateY(-5px);
  box-shadow: var(--card-shadow-hover);
}

/* 推荐标签 */
.tag-recommended {
  position: absolute;
  top: -12px;
  right: 24px;
  background: linear-gradient(135deg, #34d399, #059669);
  color: white;
  padding: 4px 14px;
  border-radius: 20px;
  font-size: 0.85rem;
  font-weight: 600;
  box-shadow: 0 4px 6px rgba(5, 150, 105, 0.25);
  z-index: 1;
}

.quick-pick h3 {
  font-size: 1.5rem;
  color: #111827;
  margin-bottom: 0.5rem;
}

/* 价格 */
.quick-pick .price {
  font-size: 2.25rem;
  font-weight: 700;
  color: var(--primary-color);
  margin-bottom: 1rem;
  display: flex;
  align-items: baseline;
  gap: 4px;
}

.quick-pick .price span {
  font-size: 1rem;
  font-weight: 400;
  color: var(--text-muted);
}

/* 流量配额 (使用无序列表呈现) */
.quick-pick .features {
  list-style: none;
  margin-bottom: 1.5rem;
  flex-grow: 1;
  padding-left: 0;
}

.quick-pick .features li {
  margin-bottom: 0.75rem;
  display: flex;
  align-items: center;
  gap: 10px;
  color: #4b5563;
  font-size: 0.95rem;
}

.quick-pick .features li::before {
  content: '✓';
  color: #10b981;
  font-weight: bold;
}

/* 购买前注意 */
.quick-pick .notes {
  font-size: 0.85rem;
  color: #92400e;
  background: #fef3c7;
  padding: 0.75rem 1rem;
  border-radius: var(--radius-md);
  margin-bottom: 1.5rem;
  border-left: 4px solid #f59e0b;
}

/* 两个按钮 (高亮与次要) */
.quick-pick .actions {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.btn {
  display: inline-block;
  text-align: center;
  padding: 0.75rem 1.5rem;
  border-radius: var(--radius-md);
  font-weight: 600;
  font-size: 1rem;
  transition: all 0.2s ease;
  cursor: pointer;
  text-decoration: none;
  border: 1px solid transparent;
}

/* 前往注册 - 橙色高亮 */
.btn-primary {
  background-color: var(--color-accent);
  color: #ffffff;
  box-shadow: 0 4px 6px rgba(16, 185, 129, 0.25);
}

.btn-primary:hover {
  background-color: var(--color-accent-hover);
  color: #ffffff;
  text-decoration: none;
  transform: translateY(-1px);
}

/* 查看实测 - 蓝色幽灵按钮 */
.btn-secondary {
  background-color: transparent;
  color: var(--color-blue);
  border-color: var(--color-blue);
}

.btn-secondary:hover {
  background-color: #eff6ff;
  color: var(--color-blue-hover);
  text-decoration: none;
}

/* 4. .faq-list 清晰分隔线与 Q&A 样式 */
.faq-list {
  margin: 0;
  padding-top: 0;
}

.faq-list h2 {
  text-align: center;
  margin-bottom: 2rem;
}

/* FAQ内的折叠面板稍作区分以更清晰 */
.faq-list details {
  border: none;
  border-bottom: 1px solid var(--border-color);
  border-radius: 0;
  margin-bottom: 0;
  background: transparent;
}

.faq-list summary {
  background: transparent;
  padding: 1.5rem 1rem;
  font-size: 1.1rem;
}

.faq-list details > div {
  padding: 0 1rem 1.5rem;
  border-top: none;
}

/* 板块明显的分界线 */
.section-divider {
  border: 0;
  height: 4px;
  background-color: #e5e7eb;
  background: linear-gradient(90deg, transparent, #d1d5db 20%, #d1d5db 80%, transparent);
  margin: 5rem 0;
  width: 100%;
}

.toc-link:hover {
    background: #eff6ff !important;
    border-color: #3b82f6 !important;
    transform: translateY(-1px);
    box-shadow: 0 2px 4px rgba(59, 130, 246, 0.1);
}

/* 5. 导航栏右侧下拉菜单 */
.site-nav-right {
  display: flex;
  align-items: center;
  gap: 1.5rem;
}

.nav-dropdown {
  position: relative;
}

.nav-dropdown-toggle {
  background: transparent;
  border: none;
  color: #374151;
  font-weight: 500;
  font-size: 1rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 0.5rem 0;
  font-family: inherit;
  transition: color 0.2s ease;
}

.nav-dropdown-toggle .arrow {
  font-size: 0.65rem;
  transition: transform 0.3s ease;
  color: #9ca3af;
}

.nav-dropdown:hover .nav-dropdown-toggle {
  color: var(--secondary-color);
}

.nav-dropdown:hover .nav-dropdown-toggle .arrow {
  transform: rotate(180deg);
  color: var(--secondary-color);
}

.nav-dropdown-menu {
  position: absolute;
  top: calc(100% + 5px);
  right: 0;
  background: rgba(255, 255, 255, 0.98);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  min-width: 220px;
  border-radius: var(--radius-md);
  box-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.1), 0 8px 10px -6px rgba(0, 0, 0, 0.1);
  border: 1px solid rgba(229, 231, 235, 0.8);
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  display: flex;
  flex-direction: column;
  padding: 0.5rem 0;
  z-index: 1005;
}

/* 增加隐形桥梁防止鼠标移出时立即消失 */
.nav-dropdown::after {
  content: '';
  position: absolute;
  bottom: -15px;
  left: 0;
  width: 100%;
  height: 15px;
}

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

.nav-dropdown-menu a {
  padding: 0.75rem 1.25rem;
  color: #4b5563;
  text-decoration: none;
  font-size: 0.95rem;
  transition: background 0.2s, color 0.2s, padding-left 0.2s;
  border-left: 3px solid transparent;
}

.nav-dropdown-menu a:hover {
  background: #f8fafc;
  color: var(--color-accent);
  border-left: 3px solid var(--color-accent);
  padding-left: 1.5rem;
}

/* 滚动条美化 */
.nav-dropdown-menu::-webkit-scrollbar {
  width: 6px;
}
.nav-dropdown-menu::-webkit-scrollbar-track {
  background: transparent;
}
.nav-dropdown-menu::-webkit-scrollbar-thumb {
  background: #cbd5e1;
  border-radius: 10px;
}

@media (max-width: 768px) {
  .site-nav-right {
    display: none; /* 移动端隐藏右侧悬浮，保持抽屉简洁 */
  }
}

/* 6. 多级悬浮下拉菜单 (Sub-dropdown) */
.nav-subdropdown {
  position: relative;
}

.nav-subdropdown-toggle {
  display: flex !important;
  justify-content: space-between;
  align-items: center;
}

.nav-subdropdown-toggle .arrow {
  font-size: 0.6rem;
  color: #9ca3af;
  transition: transform 0.3s ease;
}

.nav-subdropdown:hover .nav-subdropdown-toggle .arrow {
  color: var(--color-accent);
}

.nav-subdropdown-menu {
  position: absolute;
  top: -5px;
  right: 100%; /* 向左侧弹出，防止超出屏幕边缘 */
  background: rgba(255, 255, 255, 0.98);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  width: 280px; /* 给长标题足够的空间 */
  border-radius: var(--radius-md);
  box-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.1);
  border: 1px solid rgba(229, 231, 235, 0.8);
  opacity: 0;
  visibility: hidden;
  transform: translateX(10px);
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  display: flex;
  flex-direction: column;
  padding: 0.5rem 0;
  z-index: 1006;
}

/* 隐形桥梁防断触 */
.nav-subdropdown::before {
  content: '';
  position: absolute;
  top: 0;
  right: 100%;
  width: 15px;
  height: 100%;
}

.nav-subdropdown:hover .nav-subdropdown-menu {
  opacity: 1;
  visibility: visible;
  transform: translateX(0);
}

.nav-subdropdown-menu a {
  padding: 0.6rem 1.25rem !important;
  font-size: 0.85rem !important;
  white-space: normal; /* 允许换行 */
  line-height: 1.4;
}

.site-nav__brand:hover {
  opacity: 0.92;
  transform: translateY(-1px);
  text-decoration: none;
}

/* 2026 年份文字：现代科技感冰川蓝 + 等宽数字排版 */
.site-nav__brand span {
  font-size: 0.82em;
  font-weight: 600;
  color: #38bdf8; /* 冰川青蓝，深底上极具辨识度 */
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  background: rgba(56, 189, 248, 0.12); /* 极其微妙的浅蓝半透明底 */
  padding: 1px 6px;
  border-radius: 4px;
  border: 1px solid rgba(56, 189, 248, 0.25);
  letter-spacing: 0.8px;
  vertical-align: middle;
}

/* 品牌整体容器 */
.site-nav__brand {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  text-decoration: none;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  font-size: 1.45rem;
  font-weight: 900;
  letter-spacing: -0.5px;
  background: linear-gradient(135deg, #0f172a 0%, #1d4ed8 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  transition: transform 0.25s cubic-bezier(0.16, 1, 0.3, 1), filter 0.25s ease;
}

.site-nav__brand:hover {
  transform: translateY(-1px);
  filter: brightness(1.2);
  text-decoration: none;
}

/* 2026 年份精致胶囊标签 */
.site-nav__brand span {
  font-size: 0.75rem;
  font-weight: 700;
  color: #ffffff !important;
  background: linear-gradient(135deg, #2563eb, #0ea5e9);
  padding: 3px 8px;
  border-radius: 12px;
  letter-spacing: 0.5px;
  margin-left: 2px;
  -webkit-text-fill-color: #ffffff; /* Override parent transparent */
  box-shadow: 0 3px 8px rgba(37, 99, 235, 0.25);
  vertical-align: middle;
  line-height: 1.2;
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
}