/* ============ 变量与基础 ============ */
:root {
  --bg: #ffffff;
  --fg: #191a1c;
  --muted: #6b7280;
  --border: #e5e7eb;
  --accent: #2563eb;
  --accent-hover: #1d4ed8;
  --surface: #f6f8fa;
  --danger: #dc2626;
  --ok: #16a34a;

  /* 字体：只用系统字体，绝不引第三方（前台零外部子资源是硬约束）。
     Segoe UI Variable 是 Win11 的变体字系列，Text/Display 两档是为不同字号优化过的
     光学尺寸——正文用 Text、大标题用 Display，观感接近 Notion 那类站点的精致度。 */
  --font-sans: "Segoe UI Variable Text", system-ui, -apple-system, BlinkMacSystemFont,
    "Segoe UI", Inter, Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-display: "Segoe UI Variable Display", system-ui, -apple-system, BlinkMacSystemFont,
    "Segoe UI", Inter, Roboto, "Helvetica Neue", Arial, sans-serif;
}

* { box-sizing: border-box; }

/* 移动端基线：禁止 iOS 横屏时自动放大正文；正文 16px 也让 iOS 聚焦输入框时不缩放页面 */
html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.7;
  color: var(--fg);
  background: var(--bg);
  /* 抗锯齿更细腻，避免深色字在浅底上显得肥厚 */
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  /* 数字等宽、连字开启：价格/版本号/日期对齐更整齐 */
  font-variant-numeric: tabular-nums;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

main { flex: 1; }

.skip-link {
  position: fixed;
  left: 1rem;
  top: .5rem;
  z-index: 100;
  transform: translateY(-200%);
  padding: .55rem .85rem;
  border-radius: 7px;
  color: #fff;
  background: var(--accent);
}
.skip-link:focus { transform: translateY(0); }
main:focus { outline: none; }

/* 图片永不撑破容器（截图、Markdown 里插的图都靠这条兜底） */
img { max-width: 100%; height: auto; }

/* 长 URL、长单词在窄屏不顶破容器 */
p, li, td, th, dd, .prose { overflow-wrap: break-word; }

/* 标题用 Display 档 + 收紧字距：字号越大，字距越该收，否则显松散不够「大气」。
   text-wrap: balance 让多行标题自动配平，不支持的浏览器忽略即可。 */
h1, h2, h3, .brand, .num {
  font-family: var(--font-display);
  letter-spacing: -.021em;
  text-wrap: balance;
}
h1 { font-size: 2rem; line-height: 1.25; margin: 0 0 .5rem; font-weight: 700; }
h2 { font-size: 1.5rem; line-height: 1.3; margin: 0 0 1rem; font-weight: 650; }
h3 { font-size: 1.125rem; line-height: 1.4; margin: 0 0 .5rem; font-weight: 620; letter-spacing: -.012em; }

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

code, pre {
  font-family: ui-monospace, Consolas, "Courier New", monospace;
  background: var(--surface);
  border-radius: 4px;
}
code { padding: .1em .4em; font-size: .93em; }

.container {
  max-width: 60rem;
  margin-inline: auto;
  padding-inline: 1rem;
}
/* 法务/长文页收窄，行长更适合阅读 */
.container.narrow { max-width: 46rem; }

.center { text-align: center; }
.muted { color: var(--muted); }

/* ============ 前台导航 ============ */
/* 固定在顶部、无分隔线：靠半透明背景 + 毛玻璃与下方内容拉开层次
   （零 JS，所以不做「滚动后才出现描边」那类效果）。 */
.site-header {
  position: sticky;
  top: 0;
  z-index: 30;
  background: rgba(255, 255, 255, .8);
  backdrop-filter: saturate(180%) blur(12px);
  -webkit-backdrop-filter: saturate(180%) blur(12px);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: .5rem 1rem;
  padding-block: .85rem;
}

/* 字重/字号/字距参考 Notion、Figma 官网的导航：中性色、16px 以下、中等字重 */
.brand {
  display: inline-flex;
  align-items: center;
  gap: .5rem;
  font-weight: 600;
  font-size: 1.0625rem;
  letter-spacing: -.02em;
  color: var(--fg);
}
.brand:hover { text-decoration: none; }

.nav-links {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: .1rem;
}
/* Notion 官网那类导航的观感：15px、中等字重、近黑而非灰、字距微收 */
.nav-links a {
  color: #37352f;
  font-size: .9375rem;
  font-weight: 500;
  letter-spacing: -.005em;
  padding: .35rem .7rem;
  border-radius: 7px;
}
.nav-links a:hover { color: var(--fg); background: var(--surface); text-decoration: none; }
.nav-links a.active { color: var(--fg); font-weight: 600; }

/* ============ 通用区块 ============ */
.section { padding-block: 3rem; }
.section.alt { background: var(--surface); }

/* hero 不加背景：与固定导航同为通透的白，视觉上连成一片 */
.hero {
  padding-block: 4rem 3rem;
  text-align: center;
}
/* 随视口平滑缩放，省得在断点处突变 */
.hero h1 { font-size: clamp(1.9rem, 1.35rem + 2.6vw, 2.5rem); }
.hero .tagline {
  font-family: var(--font-display);
  font-size: clamp(1.1rem, .95rem + .7vw, 1.3rem);
  letter-spacing: -.014em;
  color: var(--muted);
  margin: 0 0 1.1rem;
}
.hero .lead {
  max-width: 36rem;
  margin: 0 auto 1.75rem;
  font-size: 1.0625rem;
  line-height: 1.65;
  color: #3c4149;
  text-wrap: pretty;
}
.platforms-hint { color: var(--muted); font-size: .9rem; }
.trust-signals {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: .45rem 1.4rem;
  margin: 1rem auto 0;
  padding: 0;
  color: #3c4149;
  font-size: .9rem;
  list-style: none;
}
.trust-signals li::before { content: "✓"; margin-right: .4rem; color: var(--ok); font-weight: 700; }

.cta { display: flex; justify-content: center; gap: .75rem; flex-wrap: wrap; }
/* 正文页里的行动号召靠左，与正文对齐 */
.cta.cta-start { margin-top: 3rem; justify-content: flex-start; }

/* 首页产品截图 */
/* 产品图直接呈现，**不加任何修饰**：应用截图自带窗口圆角与边框，
   再叠描边、圆角或投影都只会互相打架。 */
.screenshot {
  max-width: 52rem;
  margin: 2.5rem auto 0;
}
.screenshot img {
  display: block;
  width: 100%;
  height: auto;
}

/* 下载卡片里的校验和：64 个字符很长，必须允许在任意位置断行，
   否则 320px 窄屏会被撑破（响应式基准视口）。 */
.sha256 {
  margin-top: .6rem;
  font-size: .72rem;
  line-height: 1.45;
  color: var(--muted);
}
.sha256-label {
  display: block;
  font-size: .68rem;
  letter-spacing: .06em;
  text-transform: uppercase;
}
.sha256 code {
  font-size: .72rem;
  overflow-wrap: anywhere;
  color: var(--muted);
}

.verify-cmds { color: var(--muted); line-height: 1.9; }
.verify-cmds code { overflow-wrap: anywhere; }

/* Slint 署名徽章：许可要求它出现在公开下载页，样式低调但必须可见 */
.made-with { margin-top: 2.5rem; }
.made-with a {
  display: inline-flex;
  align-items: center;
  padding: .35rem .8rem;
  border: 1px solid var(--border);
  border-radius: 999px;
  font-size: .82rem;
  color: var(--muted);
  text-decoration: none;
}
.made-with a:hover { border-color: var(--accent); color: var(--accent); }

/* ============ 按钮 ============ */
.button {
  display: inline-block;
  padding: .55rem 1.4rem;
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--fg);
  background: var(--bg);
  font-size: 1rem;
  cursor: pointer;
  transition: background-color .15s ease, border-color .15s ease;
}
.button:focus-visible,
.nav-links a:focus-visible,
.footer-legal a:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}
.button:hover { background: var(--surface); text-decoration: none; }
.button.primary {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}
.button.primary:hover { background: var(--accent-hover); }
.button.danger { color: var(--danger); border-color: var(--danger); }
.button.danger:hover { background: #fef2f2; }
.button.small { padding: .25rem .75rem; font-size: .9rem; }

/* ============ 订阅区（首页收尾） ============ */
/* 现代简约做法：一条浅底色带，左文右表单；窄屏堆叠成一列。 */
.subscribe { background: var(--surface); }
.subscribe-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem 3rem;
  flex-wrap: wrap;
}
.subscribe-copy { flex: 1 1 22rem; }
.subscribe-copy h2 {
  font-size: clamp(1.4rem, 1.2rem + .9vw, 1.7rem);
  letter-spacing: -.024em;
  margin-bottom: .4rem;
}
.subscribe-copy p { margin: 0; color: var(--muted); max-width: 34rem; text-wrap: pretty; }

.subscribe-form {
  display: flex;
  gap: .5rem;
  flex: 0 1 26rem;
  flex-wrap: wrap;
}
.subscribe-form input[type="email"] {
  flex: 1 1 14rem;
  min-width: 0;
  padding: .6rem .85rem;
  font: inherit;
  color: var(--fg);
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 9px;
}
.subscribe-form input[type="email"]:focus {
  outline: 2px solid var(--accent);
  outline-offset: 1px;
  border-color: var(--accent);
}
.subscribe-form .button { flex: 0 0 auto; }
.subscribe-consent {
  display: flex;
  align-items: flex-start;
  gap: .5rem;
  flex: 1 0 100%;
  color: var(--muted);
  font-size: .82rem;
  line-height: 1.45;
}
.subscribe-consent input { flex: none; margin-top: .25rem; }

/* 屏幕阅读器可见、视觉隐藏（订阅框的 label 不占版面但要可访问） */
.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

/* ============ 区块标题（居中 + 副题） ============ */
.section-head {
  max-width: 40rem;
  margin: 0 auto 2rem;
  text-align: center;
}
.section-head h2 {
  font-size: clamp(1.5rem, 1.25rem + 1.1vw, 1.95rem);
  letter-spacing: -.026em;
  margin-bottom: .55rem;
}
.section-head p { margin: 0; color: var(--muted); font-size: 1.03rem; text-wrap: pretty; }

/* ============ 卡片 ============ */
.cards {
  /* 19rem 下限让 4 张功能卡在桌面端呈 2×2，比 3+1 更均衡；
     min(19rem, 100%) 是关键：容器比 19rem 还窄时（约 <336px 视口）
     轨道要退让成 100%，否则网格会撑破容器造成横向滚动。 */
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(19rem, 100%), 1fr));
  gap: 1.25rem;
}
.card {
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1.5rem;
  background: var(--bg);
  transition: border-color .15s ease, box-shadow .15s ease;
}
.cards .card:hover {
  border-color: #bfd3f8;
  box-shadow: 0 4px 16px rgba(31, 35, 40, .06);
}
.card p { margin: 0; color: var(--muted); }

.card-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2.5rem;
  height: 2.5rem;
  margin-bottom: .75rem;
  border-radius: 10px;
  background: #eff6ff;
  color: var(--accent);
}
.card-icon svg { width: 1.4rem; height: 1.4rem; }
/* 后台列表里的小图标 */
.card-icon.small { width: 1.75rem; height: 1.75rem; margin: 0; border-radius: 7px; }

/* 后台图片库的缩略图：统一高度，长图不撑破表格 */
.media-thumb {
  display: block;
  width: auto;
  max-width: 7rem;
  height: 3rem;
  object-fit: contain;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--surface);
}

/* Markdown 内容页（features、FAQ 答案） */
.prose h2 { margin-top: 2.25rem; }
.prose h3 { margin-top: 1.5rem; }
.prose ul, .prose ol { padding-left: 1.4rem; }
.prose li { margin-bottom: .25rem; }
.prose img { max-width: 100%; height: auto; border-radius: 8px; }
.prose pre { padding: .75rem 1rem; overflow-x: auto; }
.prose blockquote {
  margin: 1rem 0;
  padding: .25rem 1rem;
  border-left: 3px solid var(--border);
  color: var(--muted);
}
/* Markdown 里的表可能很宽，窄屏让它自己横向滚动而不是撑破页面 */
.prose table { border-collapse: collapse; display: block; overflow-x: auto; max-width: 100%; }
.prose th, .prose td { border: 1px solid var(--border); padding: .4rem .75rem; }

.legal-facts {
  margin-top: 2.25rem;
  padding-top: 1.25rem;
  border-top: 1px solid var(--border);
}
.legal-facts div { margin-bottom: .8rem; }
.legal-facts dt { font-weight: 650; }
.legal-facts dd { margin: .1rem 0 0; color: var(--muted); }

/* ============ 下载页 ============ */
.download-facts {
  margin-block: 1.25rem;
  padding: 1rem 1.2rem;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--surface);
}
.download-facts p { margin: .35rem 0; }
.download-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(14rem, 100%), 1fr));
  gap: 1rem;
  margin-block: 1.5rem;
}
/* 卡片按列排：平台名可能换行（Windows (portable)），校验和有的填有的没填，
   靠 flex 把「下载按钮」这一行锁在同一水平线上，卡片高低不齐会很难看。 */
.download-item {
  display: flex;
  flex-direction: column;
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 1.25rem;
  text-align: center;
}
/* 平台名区块高度固定为一行，居中——换行时向内撑而不是把按钮顶下去 */
.download-item .platform {
  font-weight: 600;
  font-size: 1.1rem;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 1.5em;
}
.download-item .size { color: var(--muted); font-size: .9rem; margin: .25rem 0 .75rem; }
/* 按钮之后的一切都沉底，按钮本身因此贴着上半部分，几张卡的按钮自然齐平 */
.download-item .sha256 {
  margin-top: auto;
  padding-top: .9rem;
  font-size: .72rem;
  line-height: 1.45;
  color: var(--muted);
  overflow-wrap: anywhere; /* 64 位哈希必须能折行，否则窄屏被撑破 */
}
.download-item .sha256-label {
  display: block;
  font-size: .68rem;
  letter-spacing: .06em;
  text-transform: uppercase;
  margin-bottom: .15rem;
}
.download-item .sha256 code { font-size: inherit; background: none; padding: 0; }
.history-downloads { margin: 0; padding-left: 1.1rem; }
.history-downloads li { margin-bottom: .5rem; }
.history-sha { display: block; color: var(--muted); font-size: .75rem; }
.history-sha code { overflow-wrap: anywhere; }

/* ============ 更新日志 ============ */
.release {
  border-left: 3px solid var(--border);
  padding: 0 0 1.5rem 1.25rem;
  position: relative;
}
.release::before {
  content: "";
  position: absolute;
  left: -7px;
  top: .5rem;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--accent);
}
.release h2 { margin-bottom: .25rem; }
.release .date { color: var(--muted); font-size: .9rem; }
.release ul { margin: .5rem 0 0; padding-left: 1.25rem; }

/* ============ FAQ ============ */
.faq-list { margin-top: 1.5rem; }
.faq-item {
  border: 1px solid var(--border);
  border-radius: 8px;
  margin-bottom: .75rem;
  padding: 0;
}
.faq-item summary {
  padding: .75rem 1rem;
  font-weight: 600;
  cursor: pointer;
  list-style-position: inside;
}
.faq-item[open] summary { border-bottom: 1px solid var(--border); }
.faq-item p { padding: .5rem 1rem; margin: 0; }
.faq-answer { padding: .5rem 1rem; }
.faq-answer p { padding: 0; margin: .5rem 0; }

/* ============ 表单 ============ */
.form { max-width: 32rem; }
.form.wide { max-width: 48rem; }
/* 验证码这类只填几个字符的输入框，收窄到与内容相称 */
.input-narrow { max-width: 8rem; }
.code-area { min-height: 24rem; font-family: ui-monospace, Consolas, "Courier New", monospace; }
.button-row { display: flex; flex-wrap: wrap; align-items: center; gap: .6rem; }
.preserve-lines { white-space: pre-wrap; }
.form-field { margin-bottom: 1rem; }
.form-field label {
  display: block;
  font-weight: 600;
  margin-bottom: .25rem;
}
.form-field input[type="text"],
.form-field input[type="email"],
.form-field input[type="password"],
.form-field input[type="url"],
.form-field input[type="date"],
.form-field select,
.form-field textarea {
  width: 100%;
  padding: .5rem .75rem;
  border: 1px solid var(--border);
  border-radius: 8px;
  font: inherit;
  color: var(--fg);
  background: var(--bg);
}
.form-field textarea { min-height: 8rem; resize: vertical; }
.form-field input:focus,
.form-field select:focus,
.form-field textarea:focus {
  outline: 2px solid var(--accent);
  outline-offset: 1px;
  border-color: var(--accent);
}
.form-field .hint { color: var(--muted); font-size: .9rem; margin: .25rem 0 0; }
.field-error { color: var(--danger); font-size: .9rem; margin: .25rem 0 0; }

/* 蜜罐字段：移出视口，正常用户不可见不可达 */
.hp-field {
  position: absolute;
  left: -9999px;
  width: 1px;
  height: 1px;
  overflow: hidden;
}

/* ============ 提示条 ============ */
.flash {
  background: #ecfdf5;
  color: #065f46;
  border-bottom: 1px solid #a7f3d0;
  padding-block: .6rem;
}
.error-banner {
  background: #fef2f2;
  color: var(--danger);
  border: 1px solid #fecaca;
  border-radius: 8px;
  padding: .6rem 1rem;
  margin-bottom: 1rem;
}
/* .notice：需要操作者注意但不是错误的状态块（如「备份已暂存，等待重启」） */
.notice {
  background: #fffbeb;
  border: 1px solid #fde68a;
  border-radius: 8px;
  padding: .9rem 1rem;
  margin-block: 1rem;
}
.notice > :first-child { margin-top: 0; }
.notice > :last-child { margin-bottom: 0; }

/* ============ 后台表格 ============ */
.table {
  width: 100%;
  border-collapse: collapse;
  margin-block: 1rem;
}
.table th, .table td {
  text-align: left;
  padding: .5rem .75rem;
  border-bottom: 1px solid var(--border);
  vertical-align: top;
}
.table th { background: var(--surface); font-weight: 600; white-space: nowrap; }
.table tbody tr:nth-child(even) { background: var(--surface); }

.badge {
  display: inline-block;
  padding: .05rem .5rem;
  border-radius: 999px;
  font-size: .85rem;
  background: var(--surface);
  border: 1px solid var(--border);
}
.badge.new { background: #eff6ff; color: var(--accent); border-color: #bfdbfe; }
.badge.resolved { background: #ecfdf5; color: var(--ok); border-color: #a7f3d0; }
.badge.draft { background: #fffbeb; color: #b45309; border-color: #fde68a; }

.toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: .5rem;
  margin-block: 1rem;
}
.toolbar p { margin: 0; } /* 工具条里的说明文字与按钮同一基线 */

.stat-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(10rem, 100%), 1fr));
  gap: 1rem;
  margin-block: 1rem;
}
.stat-cards .card .num { font-size: 1.8rem; font-weight: 700; }

/* ============ 页脚 ============ */
.site-footer {
  border-top: 1px solid var(--border);
  color: var(--muted);
  font-size: .9rem;
  padding-block: 1.75rem;
  margin-top: 4rem;
}
.site-footer a { color: var(--muted); }

/* 单行页脚：左边品牌 + 版权，右边法务链接与社交图标 */
.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem 2rem;
}
.footer-meta { display: flex; align-items: center; flex-wrap: wrap; gap: .5rem .9rem; }
.footer-meta p { margin: 0; }
.footer-logo { flex: none; }

.footer-end { display: flex; align-items: center; flex-wrap: wrap; gap: .5rem 1.25rem; }
.footer-legal { display: flex; gap: 1.1rem; }
.footer-legal a:hover { color: var(--fg); text-decoration: none; }

.footer-social { display: flex; gap: .15rem; }
.footer-social a {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2rem;
  height: 2rem;
  border-radius: 8px;
  color: var(--muted);
  transition: color .15s ease, background-color .15s ease;
}
.footer-social a:hover { color: var(--fg); background: var(--surface); }
.footer-social a:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }

/* ============ 后台外壳（左侧栏 + 内容区） ============ */
.admin-shell { display: flex; flex: 1; align-items: stretch; }
.admin-content { flex: 1; min-width: 0; }
.admin-body .container { max-width: 62rem; margin-inline: 0; padding-inline: 2rem; }
.admin-body .section { padding-block: 2.25rem; }

.admin-sidebar {
  flex: 0 0 15rem;
  display: flex;
  flex-direction: column;
  padding: 1rem .75rem;
  border-right: 1px solid var(--border);
  background: var(--surface);
  position: sticky;
  top: 0;
  height: 100vh;
}
.admin-brand {
  display: flex;
  align-items: center;
  gap: .55rem;
  padding: .4rem .6rem 1.1rem;
  color: var(--fg);
  font-weight: 600;
  line-height: 1.25;
}
.admin-brand:hover { text-decoration: none; }
.admin-brand small {
  display: block;
  font-size: .72rem;
  font-weight: 500;
  letter-spacing: .08em;
  text-transform: uppercase;
  color: var(--muted);
}

.admin-nav { display: flex; flex-direction: column; gap: .1rem; flex: 1; }
.admin-nav-item {
  display: flex;
  align-items: center;
  gap: .6rem;
  width: 100%;
  padding: .45rem .6rem;
  border: none;
  border-radius: 7px;
  background: none;
  color: #4b5563;
  font: inherit;
  font-size: .9375rem;
  font-weight: 500;
  text-align: left;
  cursor: pointer;
}
.admin-nav-item:hover { background: #e8ebef; color: var(--fg); text-decoration: none; }
.admin-nav-item.active { background: #e4edfd; color: var(--accent); font-weight: 600; }
.admin-nav-item svg { flex: none; }

.admin-nav-group,
.admin-nav-bottom {
  display: flex;
  flex-direction: column;
  gap: .1rem;
  margin-top: .7rem;
  padding-top: .7rem;
  border-top: 1px solid var(--border);
}
.admin-nav-bottom { margin-top: auto; }

/* 后台设置页的分组标题 */
.settings-section {
  margin-top: 2.25rem;
  padding-top: 1.25rem;
  border-top: 1px solid var(--border);
  font-size: 1.2rem;
}

/* 登录页：无导航的居中卡片 */
.auth-section { display: flex; justify-content: center; padding-block: 4rem; }
.auth-card {
  width: min(24rem, 100% - 2rem);
  padding: 2rem;
  border: 1px solid var(--border);
  border-radius: 14px;
  box-shadow: 0 8px 30px rgba(31, 35, 40, .06);
}
.auth-brand { margin-bottom: 1.25rem; }
.auth-card h1 { font-size: 1.4rem; margin-bottom: 1.25rem; }
.auth-card .form { max-width: none; }

/* ============ 响应式 ============ */
/* 后台在窄屏改为顶部横向导航 */
@media (max-width: 900px) {
  .admin-shell { flex-direction: column; }
  .admin-sidebar {
    flex: none;
    height: auto;
    position: static;
    border-right: none;
    border-bottom: 1px solid var(--border);
  }
  .admin-nav { flex-direction: row; flex-wrap: wrap; gap: .25rem; }
  .admin-nav-group,
  .admin-nav-bottom {
    flex-direction: row;
    flex-wrap: wrap;
    gap: .25rem;
    margin: 0;
    padding: 0;
    border-top: none;
  }
  .admin-nav-item { width: auto; }
  .admin-body .container { padding-inline: 1rem; }
}

@media (max-width: 640px) {
  .footer-inner { flex-direction: column; align-items: flex-start; gap: .75rem; }
  .hero { padding-block: 2.5rem 2rem; }
  .section { padding-block: 2rem; }
  .table { display: block; overflow-x: auto; }

  /* 导航换行成两行：收紧上下留白，同时把点击区域放大到手指友好的高度 */
  .nav { justify-content: center; padding-block: .6rem; row-gap: .15rem; }
  .nav-links { gap: 0 .15rem; }
  .nav-links a { padding: .5rem .6rem; }

  .card { padding: 1.25rem; }
  .container { padding-inline: 1rem; }
}

/* 触屏设备统一放大可点区域（WCAG 建议 ≥44px），桌面鼠标不受影响 */
@media (pointer: coarse) {
  .nav-links a,
  .footer-legal a,
  .admin-nav-item { min-height: 44px; display: flex; align-items: center; }
  .footer-social a { width: 44px; height: 44px; }
  .button { padding-block: .7rem; }
  .button.small { padding-block: .45rem; }
}