/* ========================================
   78CMS - V2 纯HTML版样式
   基于React版本设计系统转换
   ======================================== */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800;900&display=swap');

/* ---- CSS 变量（与React版完全一致）---- */
:root {
  --c-primary: #2563EB;
  --c-primary-dark: #1D4ED8;
  --c-primary-light: #3B82F6;
  --c-primary-pale: #EFF6FF;
  --c-accent: #06B6D4;
  --c-text: #0F172A;
  --c-text-sec: #334155;
  --c-text-muted: #64748B;
  --c-text-light: #94A3B8;
  --c-border: #E2E8F0;
  --c-border-light: #F1F5F9;
  --c-bg: #F8FAFC;
  --c-success: #10B981;
  --c-warning: #F59E0B;
  --c-danger: #EF4444;
}

/* ---- 基础重置 ---- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: 'Inter', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  color: var(--c-text-sec);
  background: #fff;
  -webkit-font-smoothing: antialiased;
  font-size: 15px;
  line-height: 1.6;
}
a { text-decoration: none; color: inherit; }
ul { list-style: none; }
img { max-width: 100%; display: block; }
input, button, textarea { font-family: inherit; outline: none; }
button { cursor: pointer; border: none; background: none; }
code { font-family: 'JetBrains Mono', 'Fira Code', 'Courier New', monospace; }

/* ---- 工具类（对应React版Tailwind） ---- */
.s-container { max-width: 1280px; margin: 0 auto; padding: 0 1rem; }
@media(min-width:640px){.s-container{padding:0 1.5rem;}}
@media(min-width:1024px){.s-container{padding:0 2rem;}}

.s-section { padding: 4rem 0 2rem; }
@media(min-width:1024px){.s-section{padding:5rem 0 2.5rem;}}

.s-title {
  font-size: 1.875rem; font-weight: 700;
  color: var(--c-text); letter-spacing: -0.025em; line-height: 1.2;
}
@media(min-width:1024px){.s-title{font-size:2.25rem;}}

.s-title-sm {
  font-size: 1.5rem; font-weight: 700;
  color: var(--c-text); letter-spacing: -0.025em; line-height: 1.2;
}
@media(min-width:1024px){.s-title-sm{font-size:1.875rem;}}

.s-subtitle { font-size: 1rem; color: var(--c-text-muted); margin-top: 0.75rem; max-width: 42rem; }

/* Pill 标签 */
.s-pill {
  display: inline-flex; align-items: center; gap: 0.375rem;
  padding: 0.25rem 0.75rem; border-radius: 9999px;
  font-size: 0.75rem; font-weight: 600;
}
.s-pill-blue { background: var(--c-primary-pale); color: var(--c-primary); }
.s-pill-green { background: #F0FDF4; color: var(--c-success); }
.s-pill-purple { background: #F5F3FF; color: #8B5CF6; }
.s-pill-cyan { background: #ECFEFF; color: #0891B2; }
.s-pill-yellow { background: #FEF3C7; color: #D97706; }

/* 卡片 */
.s-card {
  background: #fff; border-radius: 0.75rem;
  border: 1px solid var(--c-border);
  box-shadow: 0 1px 2px rgba(0,0,0,0.04);
}
.s-card-hover {
  background: #fff; border-radius: 0.75rem;
  border: 1px solid var(--c-border);
  box-shadow: 0 1px 2px rgba(0,0,0,0.04);
  transition: all 0.3s ease;
}
.s-card-hover:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 25px rgba(0,0,0,0.08);
}

/* 按钮 */
.s-btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 0.5rem;
  padding: 0.625rem 1.25rem; border-radius: 0.5rem;
  font-size: 0.875rem; font-weight: 600;
  transition: all 0.2s ease; cursor: pointer; border: none;
}
.s-btn-primary {
  background: var(--c-primary); color: #fff;
}
.s-btn-primary:hover { background: var(--c-primary-dark); }

.s-btn-outline {
  background: #fff; color: var(--c-text-sec);
  border: 1px solid var(--c-border);
}
.s-btn-outline:hover { border-color: var(--c-primary); color: var(--c-primary); }

.s-btn-ghost {
  background: transparent; color: var(--c-text-muted);
}
.s-btn-ghost:hover { color: var(--c-text); background: var(--c-border-light); }

/* 输入框 */
.s-input {
  width: 100%; padding: 0.625rem 1rem;
  border: 1px solid var(--c-border); border-radius: 0.5rem;
  font-size: 0.875rem; color: var(--c-text-sec);
  background: #fff; transition: all 0.2s ease;
}
.s-input:focus {
  border-color: var(--c-primary);
  box-shadow: 0 0 0 3px rgba(37,99,235,0.1);
}
.s-input::placeholder { color: var(--c-text-light); }

/* 图标框 */
.s-iconbox {
  width: 2.75rem; height: 2.75rem; border-radius: 0.75rem;
  display: flex; align-items: center; justify-content: center; flex-shrink: 0;
}

/* 分割线 */
.s-divider { height: 1px; background: var(--c-border-light); }

/* ---- 导航栏 ---- */
.navbar {
  position: fixed; top: 0; left: 0; right: 0; z-index: 50;
  background: #fff; border-bottom: 1px solid rgba(226,232,240,0.4);
  transition: all 0.3s ease;
}
.navbar.scrolled {
  background: rgba(255,255,255,0.95);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom-color: rgba(226,232,240,0.5);
  box-shadow: 0 1px 3px rgba(0,0,0,0.04);
}
.navbar-inner {
  display: flex; align-items: center; justify-content: space-between;
  height: 60px;
}
.nav-logo {
  display: flex; align-items: center; gap: 0.5rem; flex-shrink: 0;
}
.nav-logo-icon {
  width: 2rem; height: 2rem; border-radius: 0.5rem;
  display: flex; align-items: center; justify-content: center;
  overflow: hidden; flex-shrink: 0;
}
.nav-logo-icon img { width:100%; height:100%; object-fit: contain; display:block; }
.nav-logo-text { font-size: 15px; font-weight: 700; color: var(--c-text); }

/* 桌面导航 */
.nav-desktop { display: none; align-items: center; gap: 0.125rem; }
@media(min-width:1024px){.nav-desktop{display:flex;}}

.nav-link {
  display: flex; align-items: center; gap: 0.25rem;
  padding: 0.5rem 0.75rem; border-radius: 0.5rem;
  font-size: 0.875rem; font-weight: 500;
  color: var(--c-text-sec); transition: all 0.2s ease;
}
.nav-link:hover { color: var(--c-text); background: var(--c-border-light); }
.nav-link.active { color: var(--c-primary); background: var(--c-primary-pale); }

/* 下拉菜单 */
.nav-dropdown { position: relative; }
.nav-dropdown-menu {
  position: absolute; top: 100%; left: 0; margin-top: 0.25rem;
  width: 13rem; background: #fff; border-radius: 0.75rem;
  box-shadow: 0 10px 30px rgba(0,0,0,0.08); border: 1px solid var(--c-border);
  padding: 0.375rem; z-index: 50;
  opacity: 0; visibility: hidden; transform: translateY(-4px);
  transition: all 0.2s ease;
}
.nav-dropdown:hover .nav-dropdown-menu,
.nav-dropdown.open .nav-dropdown-menu {
  opacity: 1; visibility: visible; transform: translateY(0);
}
.nav-dropdown-item {
  display: flex; align-items: center; gap: 0.625rem;
  padding: 0.625rem 1rem; border-radius: 0.5rem;
  font-size: 0.875rem; color: var(--c-text-sec);
  transition: all 0.15s ease;
}
.nav-dropdown-item:hover { background: var(--c-primary-pale); color: var(--c-primary); }

/* 移动端 */
.nav-mobile-toggle {
  display: flex; align-items: center; justify-content: center;
  width: 2.25rem; height: 2.25rem;
  padding: 0; border-radius: 0.5rem;
  color: var(--c-text-sec); background: transparent; border: none;
  cursor: pointer; flex-shrink: 0;
}
.nav-mobile-toggle:hover { background: var(--c-border-light); color: var(--c-text); }
.nav-mobile-toggle svg { width: 20px; height: 20px; }
@media(min-width:1024px){.nav-mobile-toggle{display:none;}}

.nav-mobile-menu {
  display: none;
  background: #fff;
  border-top: 1px solid var(--c-border);
  box-shadow: 0 10px 30px rgba(0,0,0,0.08);
  position: fixed;
  top: 60px;
  left: 0;
  right: 0;
  bottom: 0;
  overflow-y: auto;
  z-index: 60;
}
.nav-mobile-menu.open { display: block; }
.nav-mobile-link {
  display: flex; align-items: center; gap: 0.625rem;
  padding: 0.625rem 0.75rem; border-radius: 0.5rem;
  font-size: 0.875rem; color: var(--c-text-sec);
}
.nav-mobile-link.active { color: var(--c-primary); background: var(--c-primary-pale); }
.nav-mobile-label {
  padding: 0.5rem 0.75rem; font-size: 0.75rem;
  font-weight: 600; color: var(--c-text-muted);
  text-transform: uppercase; letter-spacing: 0.05em;
}

/* ---- 导航右侧 ---- */
.nav-right {
  display: flex; align-items: center; gap: 0.25rem;
}
@media(min-width:1024px){.nav-right{gap:0.5rem;}}

/* 移动端隐藏语言和主题（已在菜单底部） */
.nav-lang,
.nav-theme-btn {
  display: none;
}
@media(min-width:1024px){
  .nav-lang,
  .nav-theme-btn {
    display: flex;
  }
}

/* 语言切换 */
.nav-lang-btn {
  display: flex; align-items: center; gap: 0.25rem;
  padding: 0.375rem 0.5rem; border-radius: 0.375rem;
  font-size: 0.8125rem; font-weight: 500;
  color: var(--c-text-muted); background: none; border: none;
  cursor: pointer; transition: all 0.2s ease;
}
.nav-lang-btn:hover { color: var(--c-text); background: var(--c-border-light); }
.nav-lang-btn svg { width: 16px; height: 16px; }

/* 主题切换 */
.nav-theme-btn {
  display: flex; align-items: center; justify-content: center;
  width: 2rem; height: 2rem; border-radius: 0.5rem;
  color: var(--c-text-muted); background: none; border: none;
  cursor: pointer; transition: all 0.2s ease;
}
.nav-theme-btn:hover { color: var(--c-text); background: var(--c-border-light); }

/* 登录按钮 */
.nav-login-btn {
  display: none; padding: 0.5rem 0.875rem; border-radius: 0.5rem;
  font-size: 0.875rem; font-weight: 500; color: var(--c-text-sec);
  transition: all 0.2s ease;
}
.nav-login-btn:hover { color: var(--c-text); background: var(--c-border-light); }
@media(min-width:1024px){.nav-login-btn{display:inline-flex;}}

/* 在线演示按钮 */
.nav-demo-btn {
  display: none; padding: 0.5rem 1rem; border-radius: 0.5rem;
  font-size: 0.875rem; font-weight: 600;
  background: var(--c-primary); color: #fff;
  transition: all 0.2s ease;
}
.nav-demo-btn:hover { background: var(--c-primary-dark); }
@media(min-width:1024px){.nav-demo-btn{display:inline-flex;}}

/* 用户头像 */
.nav-user-btn {
  display: flex; align-items: center; gap: 0.5rem;
  padding: 0.375rem 0.75rem 0.375rem 0.375rem;
  border-radius: 9999px; border: 1px solid var(--c-border);
  background: #fff; cursor: pointer; transition: all 0.2s ease;
}
.nav-user-btn:hover { border-color: var(--c-primary); }
.nav-avatar {
  width: 1.75rem; height: 1.75rem; border-radius: 50%;
  background: var(--c-primary-pale); color: var(--c-primary);
  display: flex; align-items: center; justify-content: center;
}
.nav-username {
  font-size: 0.8125rem; font-weight: 500; color: var(--c-text-sec);
  max-width: 5rem; overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
}

/* 登录状态容器 */
.nav-auth-user { display: flex; align-items: center; gap: 0.5rem; }
.nav-auth-guest { display: flex; align-items: center; gap: 0.5rem; }

/* 语言下拉激活 */
.nav-dropdown-item.active { color: var(--c-primary); background: var(--c-primary-pale); }
.nav-dropdown-item.active svg { color: var(--c-primary); }

/* ---- Footer ---- */
.footer { background: var(--c-bg); border-top: 1px solid var(--c-border); }
.footer-grid {
  display: grid; grid-template-columns: repeat(2, 1fr); gap: 2rem; padding: 3.5rem 0;
}
@media(min-width:768px){.footer-grid{grid-template-columns:repeat(3,1fr);}}
@media(min-width:1024px){.footer-grid{grid-template-columns:repeat(6,1fr);}}
.footer-brand { grid-column: span 2; }
.footer-brand p {
  font-size: 0.875rem; color: var(--c-text-muted);
  line-height: 1.7; margin: 1rem 0; max-width: 20rem;
}
.footer-social { display: flex; align-items: center; gap: 0.75rem; }
.footer-social a {
  width: 2.25rem; height: 2.25rem; border-radius: 0.5rem;
  background: #fff; border: 1px solid var(--c-border);
  display: flex; align-items: center; justify-content: center;
  color: var(--c-text-muted); transition: all 0.2s ease;
}
.footer-social a:hover { color: var(--c-primary); border-color: var(--c-primary); }
.footer h4 {
  font-size: 0.875rem; font-weight: 600; color: var(--c-text); margin-bottom: 0.75rem;
}
.footer ul li { margin-bottom: 0.5rem; }
.footer ul li a {
  font-size: 0.875rem; color: var(--c-text-muted);
  transition: color 0.2s ease;
}
.footer ul li a:hover { color: var(--c-primary); }
.footer-bottom {
  border-top: 1px solid var(--c-border); padding: 1rem 0;
  display: flex; flex-direction: column; align-items: center; gap: 0.5rem;
}
@media(min-width:640px){.footer-bottom{flex-direction:row;justify-content:space-between;}}
.footer-bottom p { font-size: 0.75rem; color: var(--c-text-light); }

/* ---- 页面标题区域 ---- */
.page-header { background: var(--c-bg); border-bottom: 1px solid var(--c-border); }
.page-header-inner { padding-top: 3.5rem; padding-bottom: 3.5rem; }
.page-header h1 { margin-top: 0.75rem; margin-bottom: 0.75rem; }
.page-header p { color: var(--c-text-muted); }

/* ---- Marquee ---- */
.marquee-bar {
  background: var(--c-bg); border-top: 1px solid var(--c-border);
  border-bottom: 1px solid var(--c-border); padding: 0.75rem 0;
  overflow: hidden;
}
.marquee-track {
  display: flex; white-space: nowrap;
  animation: marquee 40s linear infinite;
}
.marquee-text {
  font-size: 0.75rem; font-weight: 600;
  color: rgba(100,116,139,0.35);
  text-transform: uppercase; letter-spacing: 0.2em;
  margin: 0 2rem; flex-shrink: 0;
}

/* ---- 计数器区域 ---- */
.counter-grid {
  display: grid; grid-template-columns: repeat(2, 1fr); gap: 1.5rem;
}
@media(min-width:1024px){.counter-grid{grid-template-columns:repeat(4,1fr);}}
.counter-item { text-align: center; }
.counter-item svg { width: 1.5rem; height: 1.5rem; color: var(--c-primary); margin: 0 auto 0.5rem; }
.counter-number { font-size: 1.875rem; font-weight: 800; color: var(--c-text); }
@media(min-width:1024px){.counter-number{font-size:2.25rem;}}
.counter-label { font-size: 0.875rem; color: var(--c-text-muted); margin-top: 0.25rem; }

/* ---- 功能网格 ---- */
.feature-grid {
  display: grid; grid-template-columns: 1fr; gap: 1.25rem;
}
@media(min-width:640px){.feature-grid{grid-template-columns:repeat(2,1fr);}}
@media(min-width:1024px){.feature-grid{grid-template-columns:repeat(4,1fr);}}

.feature-card { padding: 1.25rem; }
.feature-card .s-iconbox { margin-bottom: 1rem; transition: transform 0.3s ease; }
.feature-card:hover .s-iconbox { transform: scale(1.1); }
.feature-card h3 { font-size: 15px; font-weight: 700; color: var(--c-text); margin-bottom: 0.375rem; }
.feature-card p { font-size: 13px; color: var(--c-text-muted); line-height: 1.7; }

/* ---- Dashboard Mock (Hero右侧) ---- */
.dashboard-mock {
  background: var(--c-bg); border-radius: 1rem;
  border: 1px solid var(--c-border); padding: 1.25rem;
  box-shadow: 0 20px 40px rgba(0,0,0,0.08);
}
.mock-header {
  display: flex; align-items: center; gap: 0.5rem;
  margin-bottom: 1rem; padding-bottom: 0.75rem;
  border-bottom: 1px solid var(--c-border-light);
}
.mock-dot { width: 0.75rem; height: 0.75rem; border-radius: 50%; }
.mock-dot-red { background: #EF4444; }
.mock-dot-yellow { background: #F59E0B; }
.mock-dot-green { background: #10B981; }
.mock-url {
  flex: 1; height: 1.75rem; background: #fff;
  border: 1px solid var(--c-border); border-radius: 0.5rem;
  margin: 0 0.75rem; display: flex; align-items: center;
  padding: 0 0.75rem; font-size: 10px; color: var(--c-text-light);
}
.mock-stats { display: grid; grid-template-columns: repeat(3, 1fr); gap: 0.75rem; margin-bottom: 1rem; }
.mock-stat {
  background: #fff; border-radius: 0.75rem;
  border: 1px solid var(--c-border); padding: 0.75rem; text-align: center;
}
.mock-stat-value { font-size: 1.125rem; font-weight: 700; }
.mock-stat-label { font-size: 10px; color: var(--c-text-muted); }

.mock-chart {
  background: #fff; border-radius: 0.75rem;
  border: 1px solid var(--c-border); padding: 1rem;
}
.mock-chart-header { display: flex; justify-content: space-between; margin-bottom: 0.75rem; }
.mock-chart-title { font-size: 0.75rem; font-weight: 600; color: var(--c-text); }
.mock-chart-sub { font-size: 10px; color: var(--c-text-muted); }
.mock-bars { display: flex; align-items: flex-end; gap: 0.375rem; height: 5rem; }
.mock-bar-wrap { flex: 1; background: rgba(37,99,235,0.08); border-radius: 0.25rem 0.25rem 0 0; height: 100%; position: relative; }
.mock-bar { position: absolute; bottom: 0; left: 0; right: 0; background: var(--c-primary); border-radius: 0.25rem 0.25rem 0 0; transition: height 0.5s ease; }
.mock-bar-labels { display: flex; justify-content: space-between; margin-top: 0.375rem; font-size: 9px; color: var(--c-text-light); }

.mock-table {
  margin-top: 0.75rem; background: #fff;
  border-radius: 0.75rem; border: 1px solid var(--c-border); overflow: hidden;
}
.mock-table-header {
  padding: 0.5rem 0.75rem; border-bottom: 1px solid var(--c-border-light);
  font-size: 10px; font-weight: 600; color: var(--c-text-muted); text-transform: uppercase;
}
.mock-table-row {
  display: flex; align-items: center; justify-content: space-between;
  padding: 0.5rem 0.75rem; font-size: 11px;
  border-bottom: 1px solid var(--c-border-light);
}
.mock-table-row:last-child { border-bottom: none; }
.mock-badge {
  padding: 0.125rem 0.375rem; border-radius: 0.25rem;
  font-size: 10px; font-weight: 500;
}
.mock-badge-online { background: #F0FDF4; color: #10B981; }
.mock-badge-warn { background: #FEF3C7; color: #D97706; }

/* 暗黑模式 - Dashboard Mock */
[data-theme="dark"] .dashboard-mock { background: #1E293B; }
[data-theme="dark"] .mock-stat,
[data-theme="dark"] .mock-chart,
[data-theme="dark"] .mock-table,
[data-theme="dark"] .mock-url { background: #0F172A; }
[data-theme="dark"] .mock-badge-online { background: rgba(16,185,129,0.15); }
[data-theme="dark"] .mock-badge-warn { background: rgba(245,158,11,0.15); }

/* 浮动徽章 */
.float-badge {
  position: absolute; background: #fff;
  border-radius: 0.75rem; border: 1px solid var(--c-border);
  box-shadow: 0 4px 12px rgba(0,0,0,0.08); padding: 0.75rem;
}
.float-badge-inner { display: flex; align-items: center; gap: 0.5rem; }
.float-badge-icon {
  width: 2rem; height: 2rem; border-radius: 0.5rem;
  display: flex; align-items: center; justify-content: center;
}
.float-badge-label { font-size: 10px; color: var(--c-text-muted); }
.float-badge-value { font-size: 0.875rem; font-weight: 700; color: var(--c-text); }

/* 暗黑模式 - 浮动徽章 */
[data-theme="dark"] .float-badge { background: #1E293B; border-color: #334155; }
[data-theme="dark"] .float-badge-icon[style*="#F0FDF4"] { background: rgba(16,185,129,0.15) !important; }
[data-theme="dark"] .float-badge-icon[style*="primary-pale"] { background: rgba(37,99,235,0.15) !important; }

/* ---- 文档列表 ---- */
.doc-list { divide-y: 1px solid var(--c-border-light); }
.doc-item {
  display: flex; align-items: center; justify-content: space-between;
  padding: 0.875rem 1rem; transition: all 0.2s ease;
}
.doc-item:hover { background: rgba(239,246,255,0.3); }
.doc-item-left { display: flex; align-items: center; gap: 0.75rem; }
.doc-item-left svg { width: 1rem; height: 1rem; color: var(--c-text-light); flex-shrink: 0; }
.doc-item:hover .doc-item-left svg { color: var(--c-primary); }
.doc-item-title { font-size: 0.875rem; color: var(--c-text-sec); }
.doc-item:hover .doc-item-title { color: var(--c-primary); }
.doc-item-right { display: flex; align-items: center; gap: 0.5rem; flex-shrink: 0; }
.doc-item-tag {
  font-size: 10px; padding: 0.125rem 0.5rem;
  border-radius: 9999px; background: var(--c-primary-pale);
  color: var(--c-primary); font-weight: 500;
}
.doc-item-date { font-size: 11px; color: var(--c-text-light); }

/* ---- FAQ ---- */
.faq-btn {
  width: 100%; display: flex; align-items: center; justify-content: space-between;
  padding: 0.875rem 1.25rem; text-align: left;
}
.faq-btn-text { font-size: 0.875rem; font-weight: 500; color: var(--c-text); }
.faq-icon-box {
  width: 1.5rem; height: 1.5rem; border-radius: 0.375rem;
  display: flex; align-items: center; justify-content: center; flex-shrink: 0;
  transition: all 0.2s ease;
}
.faq-icon-box.closed { background: var(--c-bg); color: var(--c-text-muted); }
.faq-icon-box.open { background: var(--c-primary); color: #fff; }
.faq-icon-box .icon-plus { display: block; }
.faq-icon-box .icon-minus { display: none; }
.faq-icon-box.open .icon-plus { display: none; }
.faq-icon-box.open .icon-minus { display: block; }
.faq-icon-box .faq-plus { display: block; }
.faq-icon-box .faq-minus { display: none; }
.faq-icon-box.open .faq-plus { display: none; }
.faq-icon-box.open .faq-minus { display: block; }
.faq-answer { padding: 0 1.25rem 1rem 1.25rem; }
.faq-answer p { font-size: 13px; color: var(--c-text-muted); line-height: 1.7; }

/* ---- CTA Banner ---- */
.cta-banner {
  background: linear-gradient(135deg, var(--c-primary), #7C3AED);
  border-radius: 1rem; padding: 2rem;
}
@media(min-width:640px){.cta-banner{padding:3rem;}}
.cta-banner h3 { font-size: 1.5rem; font-weight: 700; color: #fff; margin-bottom: 0.5rem; }
@media(min-width:640px){.cta-banner h3{font-size:1.875rem;}}
.cta-banner p { color: rgba(255,255,255,0.7); font-size: 0.875rem; }

/* ---- 博客区域 ---- */
.blog-grid {
  display: grid; grid-template-columns: 1fr; gap: 1.25rem;
}
@media(min-width:768px){.blog-grid{grid-template-columns:repeat(2,1fr);}}
@media(min-width:1024px){.blog-grid{grid-template-columns:repeat(3,1fr);}}

.blog-card { padding: 1.25rem; display: flex; flex-direction: column; }
.blog-card-header { display: flex; align-items: center; gap: 0.5rem; margin-bottom: 0.75rem; flex-shrink: 0; }
.blog-card-tag {
  font-size: 10px; padding: 0.125rem 0.5rem; border-radius: 9999px;
  background: var(--c-primary-pale); color: var(--c-primary); font-weight: 600;
}
.blog-card-date { font-size: 11px; color: var(--c-text-light); display: flex; align-items: center; gap: 0.25rem; margin-left: auto; }
.blog-card h3 { font-size: 15px; font-weight: 700; color: var(--c-text); margin-bottom: 0.375rem; line-height: 1.4; flex-shrink: 0; }
.blog-card p { font-size: 13px; color: var(--c-text-muted); line-height: 1.6; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; flex: 1; min-height: 3.2em; margin: 0; }

/* 精选博客卡片：容器外框，内部 <a> 负责左右布局 */
.blog-featured {
  display: block; overflow: hidden; border-radius: 0.875rem;
}
.blog-featured > a { display: flex; flex-direction: column; align-items: stretch; }
@media(min-width: 900px){.blog-featured > a{ flex-direction: row; }}
.blog-featured-left {
  background: linear-gradient(135deg, var(--c-primary), #7C3AED);
  padding: 1.75rem; display: flex; flex-direction: column; justify-content: center; flex: 1;
}
@media(min-width: 900px){.blog-featured-left { padding: 2.25rem; }}
.blog-featured-left .featured-tag {
  font-size: 10px; padding: 0.125rem 0.5rem; border-radius: 9999px;
  background: rgba(255,255,255,0.2); color: #fff; font-weight: 600;
  width: fit-content; margin-bottom: 0.75rem;
}
.blog-featured-left h2 { font-size: 1.125rem; font-weight: 700; color: #fff; margin-bottom: 0.5rem; }
@media(min-width: 900px){.blog-featured-left h2{font-size:1.5rem;}}
.blog-featured-left p { font-size: 0.875rem; color: rgba(255,255,255,0.75); margin-bottom: 1rem; line-height: 1.6; }
.blog-featured-left .meta { display: flex; gap: 0.75rem; font-size: 11px; color: rgba(255,255,255,0.65); }
.blog-featured-left .meta span { display: flex; align-items: center; gap: 0.25rem; }
.blog-featured-thumb {
  width: 100%; flex-shrink: 0;
  overflow: hidden; background: var(--c-bg);
  border-radius: 0;
}
.blog-featured-thumb img { width:100%; height:100%; object-fit:cover; display:block; min-height: 200px; transition: transform .4s ease; }
.s-card-hover:hover .blog-featured-thumb img { transform: scale(1.04); }
@media(min-width: 900px){
  .blog-featured-thumb { width: 44%; min-height: 260px; }
  .blog-featured-thumb img { min-height: 260px; }
}
.blog-featured-right {
  background: var(--c-bg); display: flex; align-items: center; justify-content: center;
  padding: 2rem; width: 100%;
}
@media(min-width: 900px){ .blog-featured-right { width: 44%; }}

/* 博客卡片缩略图 */
.blog-card-thumb { width: 100%; aspect-ratio: 16/9; border-radius: 0.5rem; overflow: hidden; background: var(--c-bg); margin-bottom: 0.75rem; }
.blog-card-thumb img { width:100%; height:100%; object-fit:cover; display:block; transition: transform .4s ease; }
.blog-card:hover .blog-card-thumb img { transform: scale(1.04); }

/* 标签筛选 */
.tag-filter { display: flex; align-items: center; gap: 0.5rem; flex-wrap: wrap; }
.tag-btn {
  padding: 0.25rem 0.75rem; border-radius: 0.5rem;
  font-size: 0.75rem; font-weight: 500;
  background: var(--c-bg); color: var(--c-text-muted);
  border: none; cursor: pointer; transition: all 0.2s ease;
}
.tag-btn:hover { color: var(--c-text); }
.tag-btn.active { background: var(--c-primary); color: #fff; }

/* 关键词分析面板 */
.keyword-panel { position: sticky; top: 4rem; }
.engine-label {
  display: inline-flex; align-items: center; gap: 0.375rem;
  padding: 0.375rem 0.75rem; border-radius: 0.375rem;
  background: var(--c-bg); border: 1px solid var(--c-border);
  cursor: pointer; font-size: 0.75rem; color: var(--c-text-muted);
  margin-right: 0.5rem; margin-bottom: 0.5rem;
  transition: all 0.2s ease;
}
.engine-label:hover { border-color: var(--c-primary); color: var(--c-primary); }
.engine-label input[type="checkbox"] { display: none; }
.engine-label input[type="checkbox"]:checked + span { color: var(--c-primary); font-weight: 600; }
.engine-label input[type="checkbox"]:checked { background: var(--c-primary-pale); border-color: var(--c-primary); }

/* 分页按钮 */
.pagination-btn {
  width: 2.5rem; height: 2.5rem; border-radius: 0.5rem;
  display: flex; align-items: center; justify-content: center;
  background: var(--c-bg); color: var(--c-text-muted);
  border: 1px solid var(--c-border); cursor: pointer;
  transition: all 0.2s ease; font-size: 0.875rem;
}
.pagination-btn:hover:not(:disabled) { background: var(--c-primary-pale); color: var(--c-primary); border-color: var(--c-primary); }
.pagination-btn:disabled { opacity: 0.5; cursor: not-allowed; }
.pagination-btn.pagination-active { background: var(--c-primary); color: #fff; border-color: var(--c-primary); }

/* 风格标签 */
.style-tag {
  padding: 0.375rem 0.75rem; border-radius: 9999px;
  font-size: 0.75rem; font-weight: 500;
  background: var(--c-bg); color: var(--c-text-muted);
  border: 1px solid var(--c-border); cursor: pointer;
  transition: all 0.2s ease;
}
.style-tag:hover { border-color: var(--c-primary); color: var(--c-primary); }
.style-tag.active { background: var(--c-primary-pale); color: var(--c-primary); border-color: var(--c-primary); }

/* 优化标签 */
.optimize-tag {
  padding: 0.375rem 0.75rem; border-radius: 0.5rem;
  font-size: 0.75rem; font-weight: 500;
  background: var(--c-bg); color: var(--c-text-muted);
  border: 1px solid var(--c-border); cursor: pointer;
  transition: all 0.2s ease;
}
.optimize-tag:hover { border-color: var(--c-success); color: var(--c-success); }
.optimize-tag.active { background: var(--c-success-pale); color: var(--c-success); border-color: var(--c-success); }

.depth-btn {
  padding: 0.375rem 0.75rem; border-radius: 0.5rem;
  font-size: 0.75rem; font-weight: 500;
  background: var(--c-bg); color: var(--c-text-muted);
  border: 1px solid var(--c-border); cursor: pointer;
  transition: all 0.2s ease;
}
.depth-btn:hover { border-color: var(--c-primary); color: var(--c-primary); }
.depth-btn.active { background: var(--c-primary-pale); color: var(--c-primary); border-color: var(--c-primary); }

/* ---- 定价 ---- */
.pricing-grid {
  display: grid; grid-template-columns: 1fr; gap: 1.25rem;
}
@media(min-width:640px){.pricing-grid{grid-template-columns:repeat(2,1fr);}}
@media(min-width:1280px){.pricing-grid{grid-template-columns:repeat(4,1fr);}}

.pricing-card { padding: 1.5rem; display: flex; flex-direction: column; position: relative; }
.pricing-card.popular { ring: 2px solid var(--c-primary); box-shadow: 0 10px 30px rgba(0,0,0,0.08); }
.pricing-badge {
  position: absolute; top: 0; left: 50%; transform: translateX(-50%);
  background: var(--c-primary); color: #fff;
  font-size: 10px; padding: 0.125rem 0.75rem;
  border-radius: 0 0 0.5rem 0.5rem; font-weight: 600;
}
.pricing-card h3 { font-size: 1rem; font-weight: 700; color: var(--c-text); }
.pricing-card .desc { font-size: 11px; color: var(--c-text-muted); }
.pricing-price { margin: 0.75rem 0 1rem; }
.pricing-price .num { font-size: 1.875rem; font-weight: 700; color: var(--c-text); }
.pricing-price .period { font-size: 0.75rem; color: var(--c-text-muted); }
.pricing-features { flex: 1; margin-bottom: 1.25rem; }
.pricing-feature {
  display: flex; align-items: center; gap: 0.5rem;
  padding: 0.25rem 0; font-size: 13px;
}
.pricing-feature svg { width: 14px; height: 14px; flex-shrink: 0; }
.pricing-feature .check { color: #10B981; }
.pricing-feature .cross { color: #D1D5DB; }
.pricing-feature.off { opacity: 0.4; }

/* 定价卡片按钮加大 */
.pricing-card > button {
  padding: 0.75rem 1.5rem;
  font-size: 1rem;
  font-weight: 600;
}

/* 月/年切换 */
.billing-toggle {
  display: inline-flex; align-items: center; gap: 0.25rem;
  background: #fff; border: 1px solid var(--c-border);
  border-radius: 9999px; padding: 0.25rem;
}
.billing-toggle button {
  padding: 0.5rem 1.25rem; border-radius: 9999px;
  font-size: 0.875rem; font-weight: 500; border: none;
  background: none; color: var(--c-text-muted); cursor: pointer;
  transition: all 0.2s ease;
}
.billing-toggle button.active { background: var(--c-primary); color: #fff; }
.billing-toggle button .save { font-size: 10px; }

/* ---- 对比表格 ---- */
.compare-table { width: 100%; font-size: 0.875rem; }
.compare-table th {
  padding: 0.875rem 1.25rem; text-align: center;
  font-size: 0.75rem; font-weight: 600; color: var(--c-text-muted);
  background: var(--c-bg);
}
.compare-table th:first-child { text-align: left; }
.compare-table th.pro-col { color: var(--c-primary); }
.compare-table td {
  padding: 0.875rem 1.25rem; text-align: center;
  border-top: 1px solid var(--c-border-light);
}
.compare-table td:first-child { text-align: left; font-weight: 500; color: var(--c-text); }
.compare-table tr:hover td { background: var(--c-bg); }
.compare-table td .no { color: #D1D5DB; }

/* ---- 下载页面 ---- */
.install-grid {
  display: grid; grid-template-columns: 1fr; gap: 1.25rem;
}
@media(min-width:768px){.install-grid{grid-template-columns:repeat(3,1fr);}}

.version-list { divide-y: 1px solid var(--c-border-light); }
.version-item {
  padding: 1rem 1.25rem;
  display: flex; flex-direction: column; gap: 0.75rem;
}
@media(min-width:640px){.version-item{flex-direction:row;align-items:center;justify-content:space-between;}}
.version-meta { display: flex; align-items: center; gap: 0.75rem; }
.version-num { font-size: 0.875rem; font-weight: 700; color: var(--c-text); }
.version-badge {
  font-size: 10px; padding: 0.125rem 0.5rem; border-radius: 9999px;
  background: var(--c-primary); color: #fff; font-weight: 600;
}
.version-date { font-size: 0.75rem; color: var(--c-text-muted); }
.version-changes { display: flex; flex-wrap: wrap; gap: 0.5rem; }
.version-change {
  font-size: 11px; padding: 0.125rem 0.5rem;
  border-radius: 0.25rem; background: var(--c-bg); color: var(--c-text-muted);
}

/* ---- 代码块 ---- */
.code-block {
  background: var(--c-text); border-radius: 0.5rem; padding: 1rem;
  font-size: 0.75rem; color: #A5B4FC; overflow-x: auto; line-height: 1.8;
}
.code-block .comment { color: #64748B; }
.code-block .cmd { color: #fff; }

/* ---- 关于页面 ---- */
.timeline { position: relative; padding-left: 2rem; }
.timeline::before {
  content: ''; position: absolute; left: 0.5rem; top: 0; bottom: 0;
  width: 2px; background: var(--c-border);
}
.timeline-item { position: relative; padding-bottom: 2rem; }
.timeline-item::before {
  content: ''; position: absolute; left: -1.5rem; top: 0.25rem;
  width: 0.75rem; height: 0.75rem; border-radius: 50%;
  background: var(--c-primary); border: 2px solid #fff;
  box-shadow: 0 0 0 2px var(--c-primary);
}
.timeline-time { font-size: 0.75rem; color: var(--c-text-light); margin-bottom: 0.25rem; }
.timeline-item h4 { font-size: 1rem; font-weight: 600; color: var(--c-text); margin-bottom: 0.25rem; }
.timeline-item p { font-size: 0.875rem; color: var(--c-text-muted); }

/* ---- 联系页面 ---- */
.contact-grid {
  display: grid; grid-template-columns: 1fr; gap: 3rem;
}
@media(min-width:1024px){.contact-grid{grid-template-columns:1fr 1.2fr;}}
.contact-info { display: flex; gap: 1rem; margin-bottom: 1.5rem; }
.contact-icon {
  width: 3rem; height: 3rem; border-radius: 0.5rem;
  background: var(--c-primary-pale); color: var(--c-primary);
  display: flex; align-items: center; justify-content: center; flex-shrink: 0;
}
.contact-icon svg { width: 1.5rem; height: 1.5rem; }
.contact-info h4 { font-size: 0.9375rem; font-weight: 600; color: var(--c-text); }
.contact-info p { font-size: 0.875rem; color: var(--c-text-muted); }

/* ---- 认证页面 ---- */
.auth-wrap {
  min-height: 100vh; display: flex; align-items: center; justify-content: center;
  background: var(--c-bg); padding: 6rem 1rem 2rem;
}
.auth-box { width: 100%; max-width: 28rem; }
.auth-header { text-align: center; margin-bottom: 2rem; }
.auth-header .logo-icon-lg {
  width: 3.5rem; height: 3.5rem; border-radius: 0.75rem;
  background: var(--c-primary); display: flex; align-items: center; justify-content: center;
  margin: 0 auto 1rem;
}
.auth-header h1 { font-size: 1.375rem; font-weight: 700; color: var(--c-text); }
.auth-header p { font-size: 0.875rem; color: var(--c-text-muted); margin-top: 0.25rem; }
.auth-card { background: #fff; border-radius: 1rem; padding: 2rem; box-shadow: 0 4px 20px rgba(0,0,0,0.06); border: 1px solid var(--c-border-light); }
@media(max-width:480px){.auth-card{padding:1.5rem;}}

.auth-divider {
  display: flex; align-items: center; gap: 1rem;
  margin: 1.5rem 0; color: var(--c-text-light); font-size: 0.8125rem;
}
.auth-divider::before, .auth-divider::after { content: ''; flex: 1; height: 1px; background: var(--c-border); }

.social-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 0.75rem; }
@media(max-width:480px){.social-grid{grid-template-columns:1fr;}}

/* ---- 模板市场 ---- */
.template-grid {
  display: grid; grid-template-columns: 1fr; gap: 1.25rem;
}
@media(min-width:640px){.template-grid{grid-template-columns:repeat(2,1fr);}}
@media(min-width:1024px){.template-grid{grid-template-columns:repeat(3,1fr);}}

.template-card { overflow: hidden; }
.template-img {
  height: 10rem; background: linear-gradient(135deg, var(--c-primary-pale), #E0F2FE);
  display: flex; align-items: center; justify-content: center; position: relative;
}
.template-img .tag {
  position: absolute; bottom: 0.75rem; left: 0.75rem;
  padding: 0.125rem 0.625rem; border-radius: 9999px;
  background: rgba(255,255,255,0.9); font-size: 11px; font-weight: 600;
}
.template-info { padding: 1rem; }
.template-info h4 { font-size: 0.9375rem; font-weight: 600; margin-bottom: 0.25rem; }
.template-info p { font-size: 0.8125rem; color: var(--c-text-muted); }

/* ---- 动画 ---- */
@keyframes marquee {
  0% { transform: translateX(0); }
  100% { transform: translateX(-50%); }
}
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}
@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-8px); }
}
.animate-marquee { animation: marquee 40s linear infinite; }
.animate-fade-up { animation: fadeUp 0.5s ease-out forwards; }
.animate-float { animation: float 3s ease-in-out infinite; }
.animate-float-d1 { animation: float 3s ease-in-out 1s infinite; }
.animate-float-d2 { animation: float 3s ease-in-out 2s infinite; }

/* 滚动显示 */
.reveal {
  opacity: 0; transform: translateY(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
.reveal.visible { opacity: 1; transform: translateY(0); }
.reveal-d1 { transition-delay: 0.1s; }
.reveal-d2 { transition-delay: 0.2s; }
.reveal-d3 { transition-delay: 0.3s; }
.reveal-d4 { transition-delay: 0.4s; }

/* ---- 布局工具 ---- */
.grid { display: grid; }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
@media(max-width:639px){.grid-2{grid-template-columns:1fr;}}

.flex { display: flex; }
.flex-col { flex-direction: column; }
.items-center { align-items: center; }
.justify-between { justify-content: space-between; }
.justify-center { justify-content: center; }
.gap-2 { gap: 0.5rem; }
.gap-3 { gap: 0.75rem; }
.gap-4 { gap: 1rem; }
.gap-5 { gap: 1.25rem; }
.gap-6 { gap: 1.5rem; }
.gap-8 { gap: 2rem; }
.gap-10 { gap: 2.5rem; }

.text-center { text-align: center; }
.mx-auto { margin-left: auto; margin-right: auto; }
.ml-auto { margin-left: auto; }
.mr-auto { margin-right: auto; }
.w-full { width: 100%; }
.flex-1 { flex: 1; }
.shrink-0 { flex-shrink: 0; }

.mb-2 { margin-bottom: 0.5rem; }
.mb-3 { margin-bottom: 0.75rem; }
.mb-4 { margin-bottom: 1rem; }
.mb-5 { margin-bottom: 1.25rem; }
.mb-6 { margin-bottom: 1.5rem; }
.mb-8 { margin-bottom: 2rem; }
.mb-10 { margin-bottom: 2.5rem; }
.mb-12 { margin-bottom: 3rem; }
.mt-1 { margin-top: 0.25rem; }
.mt-2 { margin-top: 0.5rem; }
.mt-3 { margin-top: 0.75rem; }
.mt-4 { margin-top: 1rem; }
.mt-6 { margin-top: 1.5rem; }
.mt-10 { margin-top: 2.5rem; }

.py-2 { padding-top: 0.5rem; padding-bottom: 0.5rem; }
.py-3 { padding-top: 0.75rem; padding-bottom: 0.75rem; }
.py-4 { padding-top: 1rem; padding-bottom: 1rem; }
.px-4 { padding-left: 1rem; padding-right: 1rem; }
.p-4 { padding: 1rem; }
.p-5 { padding: 1.25rem; }
.p-6 { padding: 1.5rem; }

.space-y-2 > * + * { margin-top: 0.5rem; }
.space-y-3 > * + * { margin-top: 0.75rem; }
.divide-y > * + * { border-top: 1px solid var(--c-border-light); }

.max-w-2xl { max-width: 42rem; }
.max-w-xl { max-width: 36rem; }

/* 隐藏/显示 */
.hidden { display: none; }
@media(min-width:1024px){.lg-block{display:block;}.lg-grid{display:grid;}}
@media(max-width:1023px){.lg-hidden{display:none;}}

/* ---- 模态框 ---- */
.modal {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transition: all 0.3s ease;
}
.modal.active {
  opacity: 1;
  visibility: visible;
}
.modal-overlay {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.5);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  transition: background 0.3s ease;
}
.modal.active .modal-overlay {
  background: rgba(0, 0, 0, 0.6);
}
.modal-content {
  position: relative;
  background: #fff;
  border-radius: 1rem;
  box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
  transform: scale(0.95) translateY(20px);
  transition: all 0.3s ease;
  max-height: 85vh;
  overflow-y: auto;
}
.modal.active .modal-content {
  transform: scale(1) translateY(0);
}
.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.5rem;
  border-bottom: 1px solid var(--c-border-light);
}
.modal-header h3 {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--c-text);
  margin: 0;
}
.modal-close {
  width: 2rem;
  height: 2rem;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 0.5rem;
  color: var(--c-text-muted);
  background: transparent;
  border: none;
  cursor: pointer;
  transition: all 0.2s ease;
}
.modal-close:hover {
  color: var(--c-text);
  background: var(--c-border-light);
}
.modal-body {
  padding: 1.5rem;
}

/* ---- 优化标签按钮 ---- */
.optimize-tag {
  display: inline-flex;
  align-items: center;
  gap: 0.375rem;
  padding: 0.5rem 1rem;
  border-radius: 0.5rem;
  font-size: 0.8125rem;
  font-weight: 500;
  color: var(--c-text-muted);
  background: #fff;
  border: 1px solid var(--c-border);
  cursor: pointer;
  transition: all 0.2s ease;
}
.optimize-tag:hover {
  border-color: var(--c-primary);
  color: var(--c-primary);
}
.optimize-tag.active {
  color: #fff;
  background: var(--c-primary);
  border-color: var(--c-primary);
}

/* ---- 暗黑模式 ---- */
[data-theme="dark"] {
  --c-text: #F1F5F9;
  --c-text-sec: #CBD5E1;
  --c-text-muted: #94A3B8;
  --c-text-light: #64748B;
  --c-border: #334155;
  --c-border-light: #1E293B;
  --c-bg: #0F172A;
}
[data-theme="dark"] body {
  background: #0F172A; color: var(--c-text-sec);
}
[data-theme="dark"] .navbar {
  background: rgba(15,23,42,0.95);
  border-bottom-color: rgba(51,65,85,0.5);
}
[data-theme="dark"] .navbar.scrolled {
  background: rgba(15,23,42,0.95);
}
[data-theme="dark"] .nav-dropdown-menu,
[data-theme="dark"] .nav-mobile-menu,
[data-theme="dark"] .s-card,
[data-theme="dark"] .auth-card,
[data-theme="dark"] .pricing-card.s-card,
[data-theme="dark"] .s-card-hover,
[data-theme="dark"] .template-card.s-card-hover,
[data-theme="dark"] .blog-card.s-card-hover,
[data-theme="dark"] .feature-card.s-card-hover,
[data-theme="dark"] .doc-item {
  background: #1E293B;
  border-color: #334155;
}
[data-theme="dark"] .s-input {
  background: #1E293B;
  border-color: #334155;
  color: var(--c-text);
}
[data-theme="dark"] .s-btn-outline {
  background: #1E293B;
  border-color: #334155;
  color: var(--c-text-sec);
}
[data-theme="dark"] .marquee-bar,
[data-theme="dark"] .page-header,
[data-theme="dark"] .counter-item,
[data-theme="dark"] .footer {
  background: #1E293B;
  border-color: #334155;
}
[data-theme="dark"] .code-block { background: #020617; }
[data-theme="dark"] .nav-user-btn { background: #1E293B; border-color: #334155; }
[data-theme="dark"] .footer-brand p,
[data-theme="dark"] .s-subtitle { color: var(--c-text-muted); }

/* ---- 响应式 ---- */
@media(min-width:1024px){
  .hero-grid-lg { grid-template-columns: 1fr 1fr !important; }
  #heroMock { display: block !important; }
}
@media(max-width:1023px){
  .docs-faq-grid { grid-template-columns: 1fr !important; }
}
@media(max-width:639px){
  .counter-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .footer-brand { grid-column: span 2; }
}
@media(max-width:480px){
  .auth-card { padding: 1.5rem; }
  .social-grid { grid-template-columns: 1fr; }
}

/* 移动端文档列表修复 */
@media(max-width:767px){
  .doc-item { flex-direction: column; align-items: flex-start; gap: 0.375rem; padding: 0.75rem 1rem; }
  .doc-item-right { width: 100%; justify-content: space-between; }
  .doc-item-date { display: none; }
}

/* ---- 回到顶部 ---- */
.back-to-top {
  position: fixed; bottom: 1.5rem; right: 1.5rem;
  width: 2.5rem; height: 2.5rem; border-radius: 50%;
  background: var(--c-primary); color: #fff;
  display: flex; align-items: center; justify-content: center;
  box-shadow: 0 4px 12px rgba(37,99,235,0.3);
  cursor: pointer; opacity: 0; visibility: hidden;
  transition: all 0.3s ease; z-index: 40; border: none;
}
.back-to-top.visible { opacity: 1; visibility: visible; }
.back-to-top:hover { transform: translateY(-2px); background: var(--c-primary-dark); }