/* ==========================================
   VIGOO银发猜谜馆 - 公共样式表 (common.css)
   专为55+中老年长者设计的无障碍、高对比度、护眼排版
   ========================================== */

:root {
  --bg-primary: #f4f6f9; /* 护眼健康浅灰蓝底色，柔和舒适，高对比度 */
  --bg-secondary: #ffffff; /* 纯白卡片底色 */
  --text-main: #0f172a; /* 深黛蓝色，极佳的高对比度长者阅读体验 */
  --text-muted: #475569; /* 墨灰色，用于辅助说明 */
  --color-primary: #1e40af; /* 乐龄睿智蓝，平静祥和，代表深邃天空与智慧 */
  --color-primary-hover: #1e3a8a; /* 深郁海蓝色 */
  --color-accent: #7c3aed; /* 优雅高贵紫，代表活力与脑力 */
  --color-accent-light: #f5f3ff; /* 淡雅紫蓝色背景 */
  --color-warning: #ca8a04; /* 雅致古铜金，用于智慧与特殊提醒，防蓝光刺眼 */
  --color-border: #cbd5e1; /* 浅蓝灰温润边框 */
  --shadow-sm: 0 4px 15px rgba(30, 64, 175, 0.06);
  --shadow-md: 0 10px 30px rgba(30, 64, 175, 0.09);
  --shadow-lg: 0 15px 40px rgba(30, 64, 175, 0.12);
  --font-family: 'Microsoft YaHei', 'PingFang SC', system-ui, -apple-system, Arial, sans-serif;
}

html {
  background-color: #f4f6f9;
  color-scheme: light;
}

html.dark-theme {
  background-color: #0f172a;
  color-scheme: dark;
}

/* 黑暗模式变量 */
html.dark-theme body,
body.dark-theme {
  --bg-primary: #0f172a;
  --bg-secondary: #1e293b;
  --text-main: #f8fafc;
  --text-muted: #cbd5e1;
  --color-primary: #3b82f6;
  --color-primary-hover: #60a5fa;
  --color-accent: #a78bfa;
  --color-accent-light: #2e1065;
  --color-border: #334155;
  --shadow-sm: 0 4px 15px rgba(0, 0, 0, 0.2);
  --shadow-md: 0 10px 30px rgba(0, 0, 0, 0.3);
  --shadow-lg: 0 15px 40px rgba(0, 0, 0, 0.4);
}

/* 基础样式重置与排版 */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: var(--font-family);
  background-color: var(--bg-primary);
  color: var(--text-main);
  font-size: 20px; /* 大字号，方便长辈阅读 */
  line-height: 1.7;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  -webkit-tap-highlight-color: transparent;
  transition: font-size 0.3s ease;
}

/* 网页整体容器 */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

/* 页头导航栏适配 (统一风格) */
header {
  background-color: var(--bg-secondary);
  border-bottom: 3px solid var(--color-border);
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: var(--shadow-sm);
}

/* 大屏时让 container 往两侧延伸，让 logo 更靠左，右侧功能键更靠右 */
@media (min-width: 1200px) {
  header .container {
    max-width: 1400px;
    padding-left: 40px;
    padding-right: 40px;
  }
}

.nav-wrapper {
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 90px;
  position: relative;
}

.logo-area {
  display: flex;
  align-items: center;
  text-decoration: none;
  gap: 14px;
}

.logo-icon {
  background: linear-gradient(135deg, var(--color-primary) 0%, #3b82f6 100%);
  color: #ffffff;
  width: 52px;
  height: 52px;
  border-radius: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 6px 15px rgba(30, 64, 175, 0.25);
  transition: transform 0.3s ease;
}

.logo-area:hover .logo-icon {
  transform: scale(1.08) rotate(5deg);
}

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

.logo-title {
  font-size: 26px;
  font-weight: 900;
  color: var(--text-main);
  letter-spacing: -0.5px;
  line-height: 1;
}

.logo-subtitle {
  font-family:
    'Microsoft YaHei',
    'PingFang SC',
    system-ui,
    -apple-system,
    sans-serif !important;
  font-size: 20px !important; /* 提升至 20px */
  font-weight: 900 !important; /* 粗体 */
  color: var(--color-primary);
  letter-spacing: 1px;
  margin-top: 1px;
  text-transform: uppercase;
}

/* 中间广告位 (728x90) 在 PC 端 */
.header-ad-space {
  width: 728px;
  height: 90px;
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: transparent;
  margin: 0 16px;
  flex-shrink: 0;
}

/* 移动端和平板隐藏广告位 */
@media (max-width: 1200px) {
  .header-ad-space {
    display: none !important;
  }
}

/* 右侧功能控制按钮 */
.header-controls {
  display: flex;
  align-items: center;
  gap: 12px;
}

.control-icon-btn {
  background-color: #f1f5f9;
  border: 2px solid var(--color-border);
  color: var(--text-main);
  width: 48px;
  height: 48px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all 0.2s ease;
}

body.dark-theme .control-icon-btn {
  background-color: #1e293b;
}

.control-icon-btn:hover {
  background-color: var(--color-accent-light);
  border-color: var(--color-primary);
  color: var(--color-primary);
}

/* 多语言下拉框 */
.lang-selector {
  position: relative;
}

.lang-dropdown {
  display: none;
  position: absolute;
  top: 56px;
  right: 0;
  background-color: var(--bg-secondary);
  border: 3px solid var(--color-border);
  border-radius: 20px;
  box-shadow: var(--shadow-md);
  width: 160px;
  z-index: 110;
  overflow: hidden;
  animation: fadeIn 0.2s ease-out;
}

.lang-item {
  display: block;
  padding: 12px 20px;
  font-size: 16px;
  font-weight: bold;
  color: var(--text-main);
  text-decoration: none;
  text-align: left;
  transition: background-color 0.2s;
}

.lang-item:hover {
  background-color: var(--color-accent-light);
  color: var(--color-primary);
}

.lang-item.active {
  background-color: var(--color-primary);
  color: #ffffff;
}

/* 导航下拉栏 - 绝对定位遮盖 */
.menu-dropdown-bar {
  display: none;
  position: absolute;
  top: 100%;
  left: 0;
  right: 0;
  background-color: var(--bg-secondary);
  border-bottom: 3px solid var(--color-border);
  box-shadow: var(--shadow-md);
  z-index: 90;
  animation: slideDown 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

.menu-dropdown-grid {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 32px;
  height: 70px;
}

.menu-nav-link {
  color: var(--text-main);
  text-decoration: none;
  font-size: 19px;
  font-weight: 800;
  padding: 8px 18px;
  border-radius: 12px;
  transition: all 0.2s ease;
}

.menu-nav-link:hover {
  background-color: var(--color-accent-light);
  color: var(--color-primary);
}

.menu-nav-link.active {
  background-color: var(--color-primary);
  color: #ffffff;
}

/* 通用按钮 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-accent) 100%);
  color: #ffffff;
  font-weight: 900;
  font-size: 21px;
  padding: 16px 40px;
  border-radius: 24px;
  text-decoration: none;
  box-shadow: 0 10px 25px rgba(30, 64, 175, 0.25);
  transition: all 0.3s ease;
  border: none;
  cursor: pointer;
}

.btn:hover {
  transform: translateY(-3px);
  box-shadow: 0 14px 30px rgba(30, 64, 175, 0.35);
}

.btn:active {
  transform: translateY(-1px);
}

/* 页脚 */
footer {
  background-color: #1e272e;
  color: #cbd5e1;
  padding: 70px 0 40px 0;
  border-top: 8px solid var(--color-primary);
}

.footer-grid {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 48px;
  margin-bottom: 48px;
  border-bottom: 1px solid #334155;
  padding-bottom: 48px;
}

.footer-brand {
  max-width: 420px;
}

.footer-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  color: #ffffff;
  font-size: 28px;
  font-weight: 900;
  text-decoration: none;
  margin-bottom: 16px;
}

.footer-logo-icon {
  background-color: var(--color-primary);
  color: #ffffff;
  padding: 10px;
  border-radius: 14px;
  display: flex;
}

.footer-desc {
  font-size: 17px;
  line-height: 1.7;
  color: #94a3b8;
}

.footer-links {
  display: flex;
  gap: 36px;
  flex-flow: row wrap;
}

.footer-links a {
  color: #cbd5e1;
  text-decoration: none;
  font-size: 18px;
  font-weight: 800;
  transition: color 0.2s ease;
}

.footer-links a:hover {
  color: var(--color-primary);
}

.footer-copyright {
  text-align: center;
  font-size: 15px;
  color: #64748b;
}

.footer-copyright a {
  color: #64748b;
  text-decoration: none;
}

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

/* 页脚底部法律条款通栏 */
.footer-legal-bar {
  text-align: center;
  padding: 18px 0;
  margin-bottom: 12px;
  border-top: 1px dashed #334155;
}

.footer-legal-links {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
}

.footer-legal-links a {
  color: #94a3b8;
  text-decoration: none;
  font-size: 16px;
  font-weight: 700;
  transition: color 0.2s ease;
}

.footer-legal-links a:hover {
  color: var(--color-primary);
  text-decoration: underline;
}

.footer-dot {
  color: #475569;
  font-size: 14px;
}

/* 通用法律条款弹窗 (Modal) 样式 */
.legal-modal {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(15, 23, 42, 0.75);
  backdrop-filter: blur(4px);
  z-index: 999;
  align-items: center;
  justify-content: center;
  padding: 20px;
}

.legal-modal-content {
  background-color: var(--bg-secondary);
  color: var(--text-main);
  border: 3px solid var(--color-border);
  border-radius: 16px;
  width: 100%;
  max-width: 680px;
  max-height: 85vh;
  overflow-y: auto;
  padding: 32px;
  position: relative;
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3);
  animation: fadeIn 0.25s ease-out;
}

.legal-modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-bottom: 2px solid var(--color-border);
  padding-bottom: 16px;
  margin-bottom: 20px;
}

.legal-modal-title {
  font-size: 24px;
  font-weight: 900;
  color: var(--color-primary);
  margin: 0;
}

.legal-modal-close {
  background: none;
  border: none;
  font-size: 28px;
  font-weight: bold;
  color: var(--text-muted);
  cursor: pointer;
  line-height: 1;
  padding: 4px 10px;
  border-radius: 8px;
}

.legal-modal-close:hover {
  background-color: var(--color-accent-light);
  color: var(--color-primary);
}

.legal-modal-body {
  font-size: 16px;
  line-height: 1.7;
  color: var(--text-main);
}

.legal-modal-body h4 {
  font-size: 18px;
  font-weight: bold;
  margin: 18px 0 8px 0;
  color: var(--text-main);
}

.legal-modal-body p {
  margin-bottom: 12px;
}

/* 动画定义 */
@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(-10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

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

/* Standalone Legal Page Styles */
.legal-page-container {
  padding: 40px 0 60px 0;
  max-width: 920px;
  margin: 0 auto;
}

.legal-card {
  background-color: var(--bg-secondary);
  border: 1px solid var(--color-border);
  border-radius: 12px;
  padding: 40px 48px;
  box-shadow: var(--shadow-sm);
}

.legal-title {
  font-size: 32px;
  font-weight: 900;
  color: var(--color-primary);
  margin-bottom: 8px;
}

.legal-meta {
  font-size: 15px;
  color: var(--text-muted);
  margin-bottom: 28px;
  padding-bottom: 16px;
  border-bottom: 2px solid var(--color-border);
}

.legal-content h2 {
  font-size: 22px;
  font-weight: 800;
  color: var(--text-main);
  margin: 28px 0 12px 0;
}

.legal-content p {
  font-size: 17px;
  line-height: 1.8;
  color: var(--text-main);
  margin-bottom: 16px;
}

.legal-content ul,
.legal-content ol {
  margin: 12px 0 20px 24px;
  font-size: 17px;
  line-height: 1.8;
  color: var(--text-main);
}

.legal-content li {
  margin-bottom: 8px;
}

@media (max-width: 768px) {
  .legal-card {
    padding: 24px 20px;
  }
  .legal-title {
    font-size: 26px;
  }
}

/* ==========================================
   移动端响应式无障碍适配 (max-width: 768px)
   ========================================== */
@media (max-width: 768px) {
  body {
    font-size: 18px; /* 移动端字号微调 */
  }

  .container {
    padding: 0 16px;
  }

  /* 顶通通栏高度与弹性排版适配 */
  .nav-wrapper {
    height: 70px;
  }

  /* logo 区域紧凑化 */
  .logo-area {
    gap: 8px;
  }

  .logo-icon {
    width: 38px;
    height: 38px;
    border-radius: 10px;
  }

  .logo-icon i {
    width: 20px !important;
    height: 20px !important;
  }

  .logo-title {
    font-size: 18px;
  }

  .logo-subtitle {
    font-size: 13px !important;
    margin-top: 1px;
  }

  /* 顶通右侧功能区紧凑化 */
  .header-controls {
    gap: 6px;
  }

  .control-icon-btn {
    width: 38px;
    height: 38px;
  }

  .control-icon-btn i {
    width: 18px !important;
    height: 18px !important;
  }

  /* 展开的语言菜单 */
  .lang-dropdown {
    top: 48px;
    width: 130px;
    border-radius: 14px;
  }

  .lang-item {
    padding: 10px 14px;
    font-size: 14px;
  }

  /* 展开的二级菜单网格化，支持折行不拥挤 */
  .menu-dropdown-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 8px;
    padding: 12px 16px;
    height: auto;
  }

  .menu-nav-link {
    font-size: 15px;
    font-weight: 900;
    padding: 8px 4px;
    text-align: center;
    border-radius: 8px;
  }

  /* 按钮在移动端的表现 */
  .btn {
    font-size: 18px;
    padding: 12px 28px;
    border-radius: 18px;
  }

  /* 页脚排版重构 */
  footer {
    padding: 40px 0 30px 0;
  }

  .footer-grid {
    flex-direction: column;
    align-items: center;
    gap: 24px;
    margin-bottom: 24px;
    padding-bottom: 24px;
    text-align: center;
  }

  .footer-brand {
    max-width: 100%;
  }

  .footer-logo {
    justify-content: center;
    font-size: 22px;
  }

  .footer-desc {
    font-size: 15px;
  }

  .footer-links {
    flex-wrap: wrap;
    justify-content: center;
    gap: 16px 24px;
  }

  .footer-links a {
    font-size: 16px;
  }
}

.advert-wrap {
  margin: 10px 0;
}
.advert-wrap .advert p {
  font-size: 12px;
  text-align: center;
  color: #686868;
  margin: 0;
}
.advert-wrap .advert .ads-ins-wrap {
  height: 90px;
  min-height: 90px;
}
@media screen and (max-width: 640px) {
  .advert-wrap .advert .ads-ins-wrap {
    height: 280px;
    min-height: 280px;
  }
}
.advert-wrap .advert .ads-ins-wrap .adsbygoogle {
  width: 100%;
  display: inline-block;
  text-align: center;
}
.advert-wrap .advert .ads-ins-wrap .adsbygoogle a {
  display: none !important;
}
.advert-wrap .advert .ads-ins-wrap .adsbygoogle[data-ad-status='unfilled'] {
  height: 100%;
}
.advert-wrap .advert .ads-ins-wrap .adsbygoogle[data-ad-status='unfilled'] a {
  display: block !important;
}

.advert-wrap .advert .ads-ins-wrap .adsbygoogle[data-ad-status='unfilled'] a img {
  max-width: 728px;
}
.advert-wrap .advert .ads-ins-wrap .adsbygoogle[data-ad-status='unfilled'] > div {
  display: none !important;
}