/* ============================================
   Clash Verge Download — v2 UI 升级版
   主色调沿用：深蓝→天蓝 (#1E3A5F → #3B82F6)
   升级点：玻璃拟态导航 / Hero 光晕网格 / 渐变按钮高光 /
          卡片渐变描边 / 图标圆底 / 渐变表格头 / 弹窗光晕等
   ============================================ */

/* ===== CSS 变量系统（升级） ===== */
:root {
  /* 主色调 — 深蓝到天蓝 */
  --primary: #2563EB;
  --primary-dark: #1D4ED8;
  --primary-light: #60A5FA;
  --primary-lighter: #DBEAFE;
  --secondary: #1E3A5F;
  --secondary-dark: #152945;
  --accent: #06B6D4;
  --accent-dark: #0E7490;
  --gradient-start: #1E3A5F;
  --gradient-end: #3B82F6;

  /* 功能色 */
  --success: #10B981;
  --success-bg: #ECFDF5;
  --warning: #F59E0B;
  --warning-bg: #FFFBEB;
  --danger: #EF4444;
  --info: #3B82F6;

  /* 文字色 */
  --text-primary: #1E293B;
  --text-secondary: #475569;
  --text-muted: #64748B;

  /* 背景色 */
  --bg: #FFFFFF;
  --bg-card: #FFFFFF;
  --bg-secondary: #F8FAFC;
  --bg-tertiary: #F1F5F9;

  /* 边框/阴影（增强层次） */
  --border: #E2E8F0;
  --border-light: #F1F5F9;
  --shadow-sm: 0 1px 3px rgba(15,23,42,0.06);
  --shadow-md: 0 8px 24px rgba(15,23,42,0.08);
  --shadow-lg: 0 18px 48px rgba(15,23,42,0.12);
  --shadow-blue: 0 10px 30px rgba(37,99,235,0.28);
  --shadow-blue-lg: 0 16px 44px rgba(37,99,235,0.40);
  --glow: 0 0 0 4px rgba(37,99,235,0.14);

  /* 圆角（更现代） */
  --radius-sm: 8px;
  --radius: 12px;
  --radius-lg: 16px;
  --radius-xl: 22px;
  --radius-full: 999px;

  /* 过渡 */
  --transition: 0.3s cubic-bezier(.22,1,.36,1);
  --transition-fast: 0.18s ease;
  --ease-out: cubic-bezier(.22,1,.36,1);
}

/* ===== 全局重置 ===== */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Noto Sans SC", "PingFang SC", sans-serif;
  color: var(--text-primary); background: var(--bg);
  line-height: 1.7; font-size: 15px; min-height: 100vh;
  display: flex; flex-direction: column; overflow-x: hidden;
  -webkit-font-smoothing: antialiased; text-rendering: optimizeLegibility;
}

a { text-decoration: none; color: var(--primary); transition: color var(--transition-fast); }
a:hover { color: var(--primary-dark); }

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

ul, ol { padding-left: 1.4em; }

/* 选区 / 滚动条 / 焦点 */
::selection { background: rgba(37,99,235,0.18); color: var(--primary-dark); }
:focus-visible { outline: 2px solid var(--primary); outline-offset: 2px; border-radius: 4px; }
/* 旧 Safari(<15.4) 不支持 :focus-visible，用 @supports 兜底键盘焦点环 */
@supports not selector(:focus-visible) {
  :focus { outline: 2px solid var(--primary); outline-offset: 2px; border-radius: 4px; }
}

/* 跳过导航链接（WCAG 2.4.1  bypass blocks） */
.skip-link {
  position: absolute; left: 50%; top: -60px; transform: translateX(-50%);
  z-index: 10000; padding: 10px 20px;
  background: var(--primary); color: #fff; font-size: 14px; font-weight: 600;
  border-radius: 0 0 var(--radius) var(--radius); text-decoration: none;
  transition: top 0.2s ease;
}
.skip-link:focus, .skip-link:focus-visible { top: 0; outline: 2px solid #fff; outline-offset: 2px; }
::-webkit-scrollbar { width: 11px; height: 11px; }
::-webkit-scrollbar-track { background: var(--bg-secondary); }
::-webkit-scrollbar-thumb { background: #CBD5E1; border-radius: 999px; border: 3px solid var(--bg-secondary); }
::-webkit-scrollbar-thumb:hover { background: var(--primary-light); }

/* ===== 容器 ===== */
.container { width: 100%; max-width: 1140px; margin: 0 auto; padding: 0 24px; }

/* ===== 导航栏（玻璃拟态升级） ===== */
.navbar {
  position: fixed; top: 0; left: 0; right: 0; z-index: 1000;
  background: rgba(255,255,255,0.72);
  backdrop-filter: saturate(180%) blur(16px); -webkit-backdrop-filter: saturate(180%) blur(16px);
  border-bottom: 1px solid transparent;
  transition: all var(--transition);
}
.navbar.scrolled {
  background: rgba(255,255,255,0.88);
  border-bottom-color: var(--border);
  box-shadow: 0 6px 24px rgba(15,23,42,0.07);
}
.navbar .container {
  display: flex; align-items: center; justify-content: space-between; height: 64px;
  overflow: visible;
}

.logo {
  display: flex; align-items: center; gap: 10px;
  font-size: 16px; font-weight: 700; color: var(--text-primary);
  white-space: nowrap; flex-shrink: 0;
}
.logo:hover { color: var(--text-primary); }
.logo-icon {
  width: 34px; height: 34px; border-radius: 10px;
  background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
  display: flex; align-items: center; justify-content: center;
  font-size: 17px; flex-shrink: 0; color: #fff;
  box-shadow: 0 4px 12px rgba(37,99,235,0.35), inset 0 1px 0 rgba(255,255,255,0.25);
}

.navbar-nav {
  display: flex; align-items: center; gap: 4px; flex-shrink: 0;
  list-style: none; margin: 0; padding: 0;
}
.nav-link {
  position: relative;
  padding: 8px 16px; font-size: 14px; font-weight: 500;
  color: var(--text-secondary); border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
}
.nav-link::after {
  content: ''; position: absolute; left: 16px; right: 16px; bottom: 4px; height: 2px;
  background: linear-gradient(90deg, var(--primary), var(--accent));
  border-radius: 999px; transform: scaleX(0); transform-origin: center;
  transition: transform var(--transition-fast);
}
.nav-link:hover { color: var(--primary); background: var(--primary-lighter); }
.nav-link:hover::after, .nav-link.active::after { transform: scaleX(1); }
.nav-link.active { color: var(--primary); background: var(--primary-lighter); font-weight: 600; }

.mobile-menu-btn {
  display: none; width: 40px; height: 40px; align-items: center; justify-content: center;
  cursor: pointer; border-radius: var(--radius-sm); border: none; background: transparent;
}
.mobile-menu-btn span {
  display: block; width: 20px; height: 2px; background: var(--text-primary);
  position: relative; transition: all var(--transition);
}
.mobile-menu-btn span::before, .mobile-menu-btn span::after {
  content: ''; position: absolute; width: 20px; height: 2px;
  background: var(--text-primary); left: 0; transition: all var(--transition);
}
.mobile-menu-btn span::before { top: -6px; }
.mobile-menu-btn span::after { top: 6px; }

@media (max-width: 768px) {
  .mobile-menu-btn { display: flex; }
  .logo { font-size: 14px; gap: 8px; }
  .logo-icon { width: 30px; height: 30px; font-size: 15px; }
  .navbar-nav {
    position: fixed; top: 64px; left: 0; right: 0;
    background: rgba(255,255,255,0.96); backdrop-filter: blur(18px);
    -webkit-backdrop-filter: blur(18px);
    flex-direction: column; padding: 14px; gap: 4px;
    transform: translateY(-120%); opacity: 0;
    pointer-events: none;
    transition: all 0.32s ease; border-bottom: 1px solid var(--border);
    box-shadow: var(--shadow-lg);
  }
  .navbar-nav.active, .navbar-nav.open {
    transform: translateY(0); opacity: 1; pointer-events: auto;
  }
  .navbar-nav .nav-link { width: 100%; padding: 12px 16px; text-align: left; }
  .navbar-nav .nav-link::after { display: none; }
}

/* ===== Hero（光晕 + 网格背景升级） ===== */
.hero-download {
  padding: 132px 0 76px;
  background:
    radial-gradient(900px 500px at 82% -8%, rgba(6,182,212,0.12), transparent 60%),
    radial-gradient(800px 480px at 12% 0%, rgba(37,99,235,0.14), transparent 55%),
    linear-gradient(165deg, #EFF6FF 0%, #F0F9FF 55%, #F8FAFC 100%);
  text-align: center; position: relative; overflow: hidden;
}
.hero-download::before {
  content: ''; position: absolute; inset: 0; z-index: 0; pointer-events: none;
  background-image:
    linear-gradient(rgba(37,99,235,0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(37,99,235,0.05) 1px, transparent 1px);
  background-size: 46px 46px;
  -webkit-mask-image: radial-gradient(circle at 50% 22%, #000, transparent 78%);
  mask-image: radial-gradient(circle at 50% 22%, #000, transparent 78%);
}
.hero-download::after {
  content: ''; position: absolute; top: -28%; right: -12%; width: 640px; height: 640px; border-radius: 50%;
  background: radial-gradient(circle, rgba(37,99,235,0.16), transparent 70%);
  z-index: 0; pointer-events: none;
}
.hero-download .container { position: relative; z-index: 1; }

.hero-version-tag {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 7px 16px; font-size: 12px; font-weight: 700; letter-spacing: 0.3px;
  color: var(--primary-dark);
  background: rgba(255,255,255,0.7);
  border: 1px solid rgba(37,99,235,0.18);
  backdrop-filter: blur(8px); -webkit-backdrop-filter: blur(8px);
  border-radius: var(--radius-full); margin-bottom: 20px;
  box-shadow: var(--shadow-sm);
}
.hero-download h1 {
  font-size: clamp(34px, 4.8vw, 54px); font-weight: 800; line-height: 1.12; letter-spacing: -0.02em;
  color: var(--text-primary); margin-bottom: 16px; position: relative; z-index: 1;
}
.hero-download h1 span.gradient-text {
  background: linear-gradient(120deg, var(--primary), var(--accent) 90%);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text;
}
.hero-subtitle { font-size: 17px; color: var(--text-secondary); max-width: 540px; margin: 0 auto 30px; line-height: 1.75; position: relative; z-index: 1; }

/* 大下载按钮组 */
.download-buttons { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; position: relative; z-index: 1; }
.btn-download {
  position: relative; overflow: hidden;
  display: inline-flex; align-items: center; gap: 10px;
  padding: 17px 38px; font-size: 16px; font-weight: 700;
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  color: #fff; border-radius: var(--radius); border: none; cursor: pointer;
  transition: transform var(--transition), box-shadow var(--transition);
  box-shadow: var(--shadow-blue);
}
.btn-download::before {
  content: ''; position: absolute; top: 0; left: 0; right: 0; height: 52%;
  background: linear-gradient(to bottom, rgba(255,255,255,0.28), transparent);
  border-radius: inherit; pointer-events: none;
}
.btn-download:hover {
  transform: translateY(-3px); box-shadow: var(--shadow-blue-lg); color: #fff;
}
.btn-download:active { transform: translateY(-1px); }
.btn-download svg { width: 20px; height: 20px; flex-shrink: 0; }

.btn-secondary {
  position: relative;
  display: inline-flex; align-items: center; gap: 8px;
  padding: 15px 28px; font-size: 15px; font-weight: 600;
  color: var(--primary); border-radius: var(--radius); cursor: pointer;
  border: 1.5px solid transparent;
  background-image: linear-gradient(var(--bg-card), var(--bg-card)), linear-gradient(135deg, var(--primary-light), var(--accent));
  background-origin: border-box; background-clip: padding-box, border-box;
  transition: all var(--transition);
}
.btn-secondary:hover {
  color: #fff;
  background-image: linear-gradient(135deg, var(--primary), var(--primary-dark)), linear-gradient(135deg, var(--primary), var(--primary-dark));
  box-shadow: var(--shadow-blue);
}

/* 版本信息条 — 玻璃 chips */
.version-bar {
  display: flex; align-items: center; justify-content: center; gap: 12px; flex-wrap: wrap;
  margin-top: 28px; font-size: 13px; color: var(--text-secondary); position: relative; z-index: 1;
}
.version-bar span {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 7px 14px; border-radius: var(--radius-full);
  background: rgba(255,255,255,0.7); border: 1px solid var(--border);
  backdrop-filter: blur(6px); -webkit-backdrop-filter: blur(6px);
  box-shadow: var(--shadow-sm);
}

@media (max-width: 600px) {
  .hero-download { padding: 108px 0 56px; }
  .download-buttons { flex-direction: column; align-items: stretch; }
  .btn-download, .btn-secondary { justify-content: center; }
  .version-bar { flex-wrap: wrap; gap: 10px; }
}

/* ===== 平台快速下载区 ===== */
.platform-downloads { padding: 72px 0; }
.pd-grid { display: grid; grid-template-columns: repeat(5, 1fr); gap: 18px; }
.pd-card {
  position: relative; overflow: hidden;
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius-lg); padding: 30px 18px; text-align: center;
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
  cursor: default;
}
.pd-card:hover {
  transform: translateY(-6px); box-shadow: var(--shadow-lg); border-color: transparent;
  background:
    linear-gradient(var(--bg-card), var(--bg-card)) padding-box,
    linear-gradient(135deg, var(--primary), var(--accent)) border-box;
}
.pd-icon {
  width: 64px; height: 64px; margin: 0 auto 16px;
  display: flex; align-items: center; justify-content: center; font-size: 30px;
  border-radius: 18px; background: linear-gradient(135deg, var(--primary-lighter), #fff);
  box-shadow: var(--shadow-sm); transition: transform var(--transition);
}
.pd-card:hover .pd-icon { transform: scale(1.08) rotate(-3deg); }
.pd-card h3 { font-size: 15px; font-weight: 700; color: var(--text-primary); margin-bottom: 4px; }
.pd-card p { font-size: 12px; color: var(--text-muted); margin-bottom: 18px; }
.pd-btn {
  display: inline-block; width: 100%; padding: 11px 0; font-size: 13px; font-weight: 600;
  color: var(--primary-dark); background: var(--primary-lighter);
  border-radius: var(--radius-sm); transition: all var(--transition-fast);
}
.pd-btn:hover { background: linear-gradient(135deg, var(--primary), var(--primary-dark)); color: #fff; }

@media (max-width: 900px) { .pd-grid { grid-template-columns: repeat(3, 1fr); } }
@media (max-width: 580px) { .pd-grid { grid-template-columns: repeat(2, 1fr); } }

/* ===== 章节通用 ===== */
.section { padding: 72px 0; }
.section-alt { position: relative; background: var(--bg-secondary); }
.section-alt::before, .section-alt::after {
  content: ''; position: absolute; left: 0; right: 0; height: 1px;
  background: linear-gradient(90deg, transparent, var(--border) 20%, var(--border) 80%, transparent);
}
.section-alt::before { top: 0; }
.section-alt::after { bottom: 0; }

.section-header { text-align: center; margin-bottom: 44px; }
.section-tag {
  display: inline-block; padding: 5px 16px; font-size: 12px; font-weight: 700; letter-spacing: 0.6px;
  color: var(--primary-dark); background: var(--primary-lighter);
  border-radius: var(--radius-full); margin-bottom: 12px;
}
.section-header h2 {
  position: relative;
  font-size: clamp(24px, 3.2vw, 32px); font-weight: 800; color: var(--text-primary);
  margin-bottom: 12px; letter-spacing: -0.02em; line-height: 1.25;
}
.section-header h2::after {
  content: ''; display: block; width: 52px; height: 3px; margin: 14px auto 0;
  background: linear-gradient(90deg, var(--primary), var(--accent)); border-radius: 999px;
}
.section-header p { font-size: 15px; color: var(--text-secondary); max-width: 540px; margin: 0 auto; line-height: 1.7; }

/* ===== 特性网格 ===== */
.features-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 20px; }
.feature-card {
  position: relative; overflow: hidden;
  background: var(--bg-card); border: 1px solid var(--border-light);
  border-radius: var(--radius-lg); padding: 28px 24px; transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
}
.feature-card:hover {
  transform: translateY(-6px); box-shadow: var(--shadow-lg); border-color: transparent;
  background:
    linear-gradient(var(--bg-card), var(--bg-card)) padding-box,
    linear-gradient(135deg, var(--primary), var(--accent)) border-box;
}
.feat-icon {
  width: 56px; height: 56px; margin-bottom: 14px;
  display: flex; align-items: center; justify-content: center; font-size: 26px;
  border-radius: 16px; background: linear-gradient(135deg, var(--primary-lighter), #fff);
  box-shadow: var(--shadow-sm);
}
.feature-card h4 { font-size: 16px; font-weight: 700; color: var(--text-primary); margin-bottom: 8px; }
.feature-card p { font-size: 14px; color: var(--text-secondary); line-height: 1.75; }

/* ===== 更新日志（卡片化 + 渐变 badge） ===== */
.changelog-list { max-width: 760px; margin: 0 auto; }
.changelog-item {
  padding: 22px 26px; margin-bottom: 14px;
  background: var(--bg-card); border: 1px solid var(--border-light);
  border-radius: var(--radius-lg); transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
}
.changelog-item:last-child { margin-bottom: 0; }
.changelog-item:hover { transform: translateY(-3px); box-shadow: var(--shadow-md); border-color: var(--primary-light); }
.cl-header { display: flex; align-items: center; gap: 12px; margin-bottom: 10px; }
.cl-badge {
  display: inline-flex; padding: 4px 12px; font-size: 11px; font-weight: 700;
  border-radius: var(--radius-full); text-transform: uppercase; letter-spacing: 0.5px; color: #fff;
}
.cl-badge.latest { background: linear-gradient(135deg, #34D399, var(--success)); }
.cl-badge.stable { background: linear-gradient(135deg, var(--primary-light), var(--primary)); }
.cl-header h4 { font-size: 16px; font-weight: 700; color: var(--text-primary); }
.cl-date { font-size: 13px; color: var(--text-muted); margin-left: auto; }
.cl-body { font-size: 14px; color: var(--text-secondary); line-height: 1.75; padding-left: 4px; }
.cl-body ul { margin-top: 8px; }
.cl-body li { margin-bottom: 4px; }

/* ===== 系统要求表（渐变表头） ===== */
.sys-table-wrapper {
  overflow-x: auto; border-radius: var(--radius-lg);
  border: 1px solid var(--border-light); box-shadow: var(--shadow-sm);
}
.sys-table { width: 100%; border-collapse: collapse; font-size: 14px; min-width: 550px; }
.sys-table th, .sys-table td { padding: 15px 18px; text-align: left; border-bottom: 1px solid var(--border-light); }
.sys-table th {
  background: linear-gradient(135deg, var(--secondary), var(--primary));
  color: #fff; font-weight: 700; font-size: 13px; text-transform: uppercase; letter-spacing: 0.5px;
}
.sys-table tr:last-child td { border-bottom: none; }
.sys-table tbody tr { transition: background var(--transition-fast); }
.sys-table tbody tr:hover td { background: var(--primary-lighter); }
.sys-table td:first-child { font-weight: 600; color: var(--text-primary); }

/* ===== 详细下载列表 ===== */
.dl-section { scroll-margin-top: 80px; padding: 48px 0; border-bottom: 1px solid var(--border-light); }
.dl-section:last-child { border-bottom: none; }
.dl-header { display: flex; align-items: center; gap: 14px; margin-bottom: 24px; }
.dl-platform-icon {
  width: 54px; height: 54px; border-radius: var(--radius);
  display: flex; align-items: center; justify-content: center; font-size: 28px; flex-shrink: 0;
  box-shadow: var(--shadow-sm);
}
.dl-header h3 { font-size: 22px; font-weight: 700; }
.dl-header p { font-size: 14px; color: var(--text-muted); }

.dl-files { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 16px; }
.dl-file-card {
  background: var(--bg-card); border: 1px solid var(--border-light);
  border-radius: var(--radius-lg); padding: 24px; text-align: center;
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
}
.dl-file-card:hover {
  transform: translateY(-4px); box-shadow: var(--shadow-lg); border-color: transparent;
  background:
    linear-gradient(var(--bg-card), var(--bg-card)) padding-box,
    linear-gradient(135deg, var(--primary), var(--accent)) border-box;
}
.dl-file-icon { width: 56px; height: 56px; margin: 0 auto 12px; display: flex; align-items: center; justify-content: center; font-size: 28px;
  border-radius: 16px; background: linear-gradient(135deg, var(--primary-lighter), #fff); box-shadow: var(--shadow-sm); }
.dl-file-card h4 { font-size: 15px; font-weight: 700; color: var(--text-primary); margin-bottom: 4px; }
.dl-file-card .dl-meta { font-size: 12px; color: var(--text-muted); margin-bottom: 16px; }
.dl-file-card .btn-dl {
  display: block; padding: 11px 0; font-size: 13px; font-weight: 600;
  color: #fff; border: none; cursor: pointer; border-radius: var(--radius-sm);
  transition: all var(--transition-fast); width: 100%;
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
}
.dl-file-card .btn-dl:hover { background: linear-gradient(135deg, var(--primary-dark), #1E40AF); }
.dl-file-card .btn-dl:disabled { background: linear-gradient(135deg, #94A3B8, #64748B); cursor: not-allowed; }

/* ===== FAQ ===== */
.faq-list { list-style: none !important; padding: 0 !important; max-width: 760px; margin: 0 auto; }
.faq-item {
  background: var(--bg-card); border: 1px solid var(--border-light);
  border-radius: var(--radius-lg); margin-bottom: 12px; overflow: hidden;
  transition: border-color var(--transition), box-shadow var(--transition);
}
.faq-item.active, .faq-item.open {
  border-color: transparent; box-shadow: var(--shadow-md);
  background:
    linear-gradient(var(--bg-card), var(--bg-card)) padding-box,
    linear-gradient(135deg, var(--primary), var(--accent)) border-box;
}
.faq-question {
  display: flex; align-items: center; justify-content: space-between;
  width: 100%; padding: 18px 22px; font-size: 15px; font-weight: 600;
  color: var(--text-primary); background: none; border: none; cursor: pointer;
  text-align: left; gap: 14px; transition: color var(--transition-fast);
}
.faq-question:hover { color: var(--primary); }
.faq-icon {
  width: 24px; height: 24px; min-width: 24px; border-radius: 50%;
  background: var(--bg-secondary); display: flex; align-items: center;
  justify-content: center; font-size: 14px; color: var(--text-muted);
  transition: all var(--transition); font-weight: 700; line-height: 1;
}
.faq-item.active .faq-icon, .faq-item.open .faq-icon {
  background: linear-gradient(135deg, var(--primary), var(--primary-dark)); color: #fff; transform: rotate(45deg);
}
.faq-answer {
  max-height: 0; overflow: hidden; transition: max-height 0.35s ease, padding 0.35s ease; padding: 0 22px;
}
.faq-item.active .faq-answer, .faq-item.open .faq-answer { max-height: 350px; padding: 0 22px 18px; }
.faq-answer p { font-size: 14px; color: var(--text-secondary); line-height: 1.75; }

/* ===== 友链 ===== */
.friend-links { background: var(--bg-secondary); border-top: 1px solid var(--border-light); padding: 36px 0; font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Noto Sans SC", "PingFang SC", sans-serif; }
.friend-links .container { text-align: center; }
.friend-links h3 { font-size: 14px; font-weight: 600; color: var(--text-primary); margin-bottom: 16px; }
.friend-links-row { display: flex; flex-wrap: wrap; justify-content: center; gap: 10px; }
.friend-link {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 8px 18px; font-size: 13px; color: var(--text-secondary);
  background: var(--bg-card); border: 1px solid var(--border-light);
  border-radius: var(--radius-full); transition: all var(--transition-fast);
}
.friend-link::before {
  content: ''; width: 6px; height: 6px; border-radius: 50%;
  background: var(--primary); flex-shrink: 0; opacity: 0.5; transition: opacity var(--transition-fast);
}
.friend-link:hover {
  color: #fff; border-color: transparent; transform: translateY(-2px);
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  box-shadow: var(--shadow-blue);
}
.friend-link:hover::before { opacity: 1; background: #fff; }

/* ===== CTA（对角渐变 + 光晕） ===== */
.cta-section {
  position: relative; overflow: hidden;
  padding: 72px 0; text-align: center;
  background: linear-gradient(135deg, #EFF6FF 0%, #DBEAFE 55%, #E0F2FE 100%);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Noto Sans SC", "PingFang SC", sans-serif;
}
.cta-section::before {
  content: ''; position: absolute; top: -40%; left: -10%; width: 560px; height: 560px; border-radius: 50%;
  background: radial-gradient(circle, rgba(37,99,235,0.16), transparent 70%); pointer-events: none;
}
.cta-section::after {
  content: ''; position: absolute; bottom: -50%; right: -12%; width: 560px; height: 560px; border-radius: 50%;
  background: radial-gradient(circle, rgba(6,182,212,0.14), transparent 70%); pointer-events: none;
}
.cta-section .container { position: relative; z-index: 1; }
.cta-section h2 {
  position: relative;
  font-size: clamp(24px, 3.2vw, 30px); font-weight: 800; color: var(--text-primary);
  margin-bottom: 12px; letter-spacing: -0.02em; line-height: 1.25;
}
.cta-section h2::after {
  content: ''; display: block; width: 52px; height: 3px; margin: 14px auto 0;
  background: linear-gradient(90deg, var(--primary), var(--accent)); border-radius: 999px;
}
.cta-section p { font-size: 15px; color: var(--text-secondary); margin-bottom: 26px; }
.cta-buttons { display: flex; gap: 14px; justify-content: center; flex-wrap: wrap; }

/* ===== Footer（渐变增强） ===== */
.footer {
  background: linear-gradient(160deg, var(--secondary), var(--secondary-dark));
  color: rgba(255,255,255,0.68); padding: 56px 0 26px; margin-top: auto;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Noto Sans SC", "PingFang SC", sans-serif;
  font-size: 15px; line-height: 1.7;
}
.footer-grid { display: grid; grid-template-columns: 1.5fr 1fr 1fr 1fr; gap: 32px; margin-bottom: 36px; }
.footer-brand .logo { color: #fff; margin-bottom: 14px; }
.footer-brand .logo-icon { box-shadow: 0 4px 14px rgba(37,99,235,0.5), inset 0 1px 0 rgba(255,255,255,0.3); }
.footer-brand p { font-size: 14px; line-height: 1.7; opacity: 0.7; }
.footer-col h4 { color: #fff; font-size: 14px; font-weight: 600; margin-bottom: 16px; }
.footer-col a {
  display: block; font-size: 13px; color: rgba(255,255,255,0.55); padding: 5px 0;
  transition: color var(--transition-fast), padding-left var(--transition-fast);
}
.footer-col a:hover { color: #fff; padding-left: 6px; }
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.12); padding-top: 20px;
  display: flex; justify-content: space-between; font-size: 12px; flex-wrap: wrap; gap: 6px;
}
.footer-bottom a:hover { color: #fff; }

@media (max-width: 768px) {
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 24px; }
  .footer-bottom { flex-direction: column; text-align: center; }
}

/* ===== 回到顶部 ===== */
.back-to-top {
  position: fixed; bottom: 30px; right: 30px; z-index: 999;
  width: 44px; height: 44px; border-radius: 50%;
  background: linear-gradient(135deg, var(--primary), var(--primary-dark)); color: #fff; border: none;
  cursor: pointer; font-size: 18px; display: flex; align-items: center; justify-content: center;
  box-shadow: var(--shadow-blue);
  opacity: 0; visibility: hidden; transform: translateY(10px);
  transition: all var(--transition);
}
.back-to-top.visible { opacity: 1; visibility: visible; transform: translateY(0); }
.back-to-top:hover { background: linear-gradient(135deg, var(--primary-dark), #1E40AF); transform: translateY(-3px); box-shadow: var(--shadow-blue-lg); }

/* ===== 动画 ===== */
.js .reveal { opacity: 0; transform: translateY(26px); transition: opacity 0.7s var(--ease-out), transform 0.7s var(--ease-out); }
.reveal.visible, .reveal.active { opacity: 1; transform: none; }

/* 无 JS 或用户偏好减弱动效时，内容直接显示，避免被永久隐藏 */
@media (prefers-reduced-motion: reduce) {
  .reveal { transition: none; opacity: 1 !important; transform: none !important; }
}
@media (scripting: none) {
  .reveal { opacity: 1 !important; transform: none !important; }
}

/* ===== 平台标签 ===== */
.platform-tabs { display: flex; gap: 8px; justify-content: center; margin-bottom: 38px; flex-wrap: wrap; }
.platform-tab {
  padding: 8px 20px; font-size: 13px; font-weight: 500;
  color: var(--text-secondary); background: var(--bg-card);
  border: 1px solid var(--border); border-radius: var(--radius-full); cursor: pointer;
  transition: all var(--transition-fast);
}
.platform-tab:hover { color: var(--primary); border-color: var(--primary-light); background: var(--primary-lighter); }
.platform-tab.active {
  color: #fff; border-color: transparent;
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  box-shadow: var(--shadow-blue);
}

/* 响应式调整 */
@media (max-width: 480px) {
  .section { padding: 52px 0; }
  .cta-section { padding: 52px 0; }
}

/* ===== 自动抽取的内联样式工具类（保持原样，置于末尾优先） ===== */
.is1 { padding-top:100px; padding-bottom:48px; }
.is2 { max-width:720px; margin:0 auto; }
.is3 { font-size:24px; font-weight:700; color:var(--text-primary); margin-bottom:18px; }
.is4 { font-size:15px; color:var(--text-secondary); line-height:1.8; margin-bottom:14px; }
.is5 { font-size:18px; font-weight:700; color:var(--text-primary); margin:28px 0 14px; }
.is6 { grid-template-columns: repeat(2, 1fr); }
.is7 { max-width:640px; margin:0 auto; text-align:center; }
.is8 { font-size:24px; font-weight:700; margin-bottom:16px; }
.is9 { font-size:15px; color:var(--text-secondary); line-height:1.8; margin-bottom:24px; }
.is10 { display:inline-flex; }
.is11 { max-width:680px; margin:0 auto; }
.is12 { font-size:22px; font-weight:700; text-align:center; margin-bottom:24px; }
.is13 { font-size:14px; color:var(--text-secondary); line-height:2; }
.is14 { margin-top:24px; padding:18px; background:#FFFBEB; border-left:4px solid var(--warning); border-radius:0 var(--radius-sm) var(--radius-sm) 0; font-size:13px; line-height:1.75; color:var(--text-secondary); }
.is15 { padding-top:100px; padding-bottom:44px; }
.is16 { margin-top:24px; margin-bottom:0; justify-content:center; }
.is17 { background:#EFF6FF; }
.is18 { margin-top:16px; font-size:13px; color:var(--text-muted); }
.is19 { background:#F5F3FF; }
.is20 { background:#ECFDF5; }
.is21 { opacity:0.6; }
.is22 { grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); }
.is23 { border-left:3px solid var(--primary); }
.is24 { font-size:16px; margin-bottom:10px; }
.is25 { font-size:14px; color:var(--text-secondary); line-height:1.8; }
.is26 { border-left:3px solid var(--success); }
.is27 { margin-top:8px; }

/* ===== sys-table 移动端优化 ===== */
@media (max-width: 600px) {
  .sys-table { font-size: 13px; }
  .sys-table th, .sys-table td { padding: 10px 12px; }
  .sys-table-wrapper { -webkit-overflow-scrolling: touch; }
}

/* ===== 面包屑（新增页面共用） ===== */
.breadcrumb { font-size: 13px; color: var(--text-muted); margin: 18px 0 6px; }
.breadcrumb a { color: var(--text-secondary); }
.breadcrumb a:hover { color: var(--primary); }
.breadcrumb .sep { margin: 0 8px; opacity: .6; }

/* ===== 提示框（新增页面共用） ===== */
.notice-box {
  display: flex; gap: 12px; align-items: flex-start;
  padding: 16px 18px; border-radius: var(--radius);
  background: var(--warning-bg); border: 1px solid rgba(245,158,11,0.25);
  margin: 0 0 26px;
}
.notice-box .notice-icon { font-size: 18px; line-height: 1.4; flex-shrink: 0; }
.notice-box .notice-text { font-size: 14px; color: var(--text-secondary); line-height: 1.75; }
.notice-box .notice-text strong { color: var(--text-primary); }
.notice-box.info { background: var(--primary-lighter); border-color: rgba(37,99,235,0.22); }
.notice-box.success { background: var(--success-bg); border-color: rgba(16,185,129,0.25); }

/* ===== 步骤条（安装 / 指引，新增页面共用） ===== */
.guide-steps { display: flex; flex-direction: column; gap: 14px; }
.guide-step {
  display: flex; gap: 16px; align-items: flex-start;
  padding: 18px 20px; background: var(--bg-card);
  border: 1px solid var(--border-light); border-radius: var(--radius-lg);
  transition: all var(--transition);
}
.guide-step:hover {
  border-color: transparent;
  background: linear-gradient(var(--bg-card),var(--bg-card)) padding-box,
              linear-gradient(135deg,var(--primary),var(--accent)) border-box;
  box-shadow: var(--shadow-md);
}
.step-num {
  width: 34px; height: 34px; flex-shrink: 0; border-radius: 50%;
  background: linear-gradient(135deg,var(--primary),var(--primary-dark));
  color: #fff; font-weight: 700; font-size: 15px;
  display: flex; align-items: center; justify-content: center;
}
.step-content h4 { font-size: 16px; font-weight: 700; color: var(--text-primary); margin-bottom: 6px; }
.step-content p { font-size: 14px; color: var(--text-secondary); line-height: 1.75; }
.step-content code {
  background: var(--bg-tertiary); padding: 1px 6px; border-radius: 4px;
  font-size: 12.5px; color: var(--primary-dark); font-family: 'SF Mono', Consolas, monospace;
}

/* ===== 客户端外链（移动端替代方案页面） ===== */
.client-link {
  display: inline-flex; align-items: center; gap: 4px; margin-top: 10px;
  color: var(--primary); font-weight: 600; font-size: 13.5px;
}
.client-link:hover { text-decoration: underline; }

/* ===== FontAwesome 图标层（参考 twts_149_creativeagency 模板） ===== */
.feat-icon {
  border-radius: 50%;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  box-shadow: 0 8px 20px rgba(37,99,235,0.28);
}
.feat-icon i.fa { color: #fff; font-size: 22px; line-height: 1; }
.logo-icon i.fa { color: #fff; }
.section-tag i.fa { vertical-align: middle; margin-right: 6px; }
.notice-box .notice-icon i.fa { color: var(--warning); }
.notice-box.info .notice-icon i.fa { color: var(--info); }
.notice-box.success .notice-icon i.fa { color: var(--success); }
.back-to-top i.fa { font-size: 16px; }
.cell-check i.fa, .cell-cross i.fa, .cell-warn i.fa { font-size: 13px; }
.footer-social { display: flex; gap: 10px; margin-top: 16px; }
.footer-social a {
  width: 36px; height: 36px; border-radius: 50%;
  background: rgba(255,255,255,0.10); color: #fff;
  display: inline-flex; align-items: center; justify-content: center;
  font-size: 15px; transition: all .2s ease;
}
.footer-social a:hover { background: var(--primary); transform: translateY(-3px); box-shadow: var(--shadow-blue); }