/* =========================================================
   datasafe — 单一样式表，三页共用
   无渐变、无发光、无第三方字体加载（仅声明本地字体栈）
   ========================================================= */
:root {
  --bg: #0A0E1A;
  --surface: #141A2A;
  --text: #E6E9F0;
  --text-muted: #9AA3B5;
  --accent: #5BC0BE;
  --border: #232A3D;
  --status-active: #3FB950;
  --status-progress: #D29922;
  --status-planned: #6E7681;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html { color-scheme: dark; }

body {
  font-family: Inter, "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  font-size: 16px;
  line-height: 1.65;
  background: var(--bg);
  color: var(--text);
}

.container { max-width: 1100px; margin: 0 auto; padding: 0 24px; }

/* 正文链接：强调色只用于按钮、链接、状态文字 */
a { color: var(--accent); }
a:hover { text-decoration: underline; }

/* 键盘跳转链接 */
.skip-link {
  position: absolute; left: -9999px;
  padding: 10px 16px;
  background: var(--surface);
  border: 1px solid var(--accent);
  border-radius: 8px;
}
.skip-link:focus { left: 16px; top: 16px; z-index: 10; }

/* ── 导航 ─────────────────────────────────────────── */
.site-header { border-bottom: 1px solid var(--border); }
.nav {
  display: flex; align-items: center; justify-content: space-between;
  gap: 16px; padding: 20px 0;
}
.brand { font-weight: 700; font-size: 17px; letter-spacing: .02em; text-decoration: none; }
.nav ul { display: flex; gap: 24px; list-style: none; }
.nav a { text-decoration: none; font-size: 15px; color: var(--text-muted); }
.nav a:not(.brand):hover { color: var(--accent); text-decoration: none; }
.nav a[aria-current="page"] { color: var(--text); }

/* ── 首页主视觉 ───────────────────────────────────── */
.hero { padding: 88px 0 56px; }
.hero h1 { font-size: clamp(30px, 5vw, 44px); line-height: 1.25; max-width: 20ch; }
.hero .lead { max-width: 62ch; margin-top: 16px; font-size: 18px; color: var(--text-muted); }

.actions { display: flex; flex-wrap: wrap; gap: 16px; margin-top: 32px; }
.btn {
  display: inline-flex; align-items: center; justify-content: center;
  padding: 12px 24px;
  border: 1px solid var(--accent); border-radius: 8px;
  font-weight: 600; font-size: 15px; text-decoration: none;
}
.btn:hover { text-decoration: none; }
.btn-primary { background: var(--accent); color: var(--bg); }
.btn-primary:hover { background: #7AD1CF; }
.btn-secondary { color: var(--accent); }
.btn-secondary:hover { background: rgba(91, 192, 190, 0.12); }

/* ── 事实卡片：surface + 1px 边框 + 8px 圆角 + 24px 内边距，无阴影 ── */
.cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; padding-bottom: 80px; }
.card { background: var(--surface); border: 1px solid var(--border); border-radius: 8px; padding: 24px; }
.card h2 { font-size: 17px; margin-bottom: 8px; }
.card p { font-size: 15px; color: var(--text-muted); }

/* ── 内页公共 ─────────────────────────────────────── */
.page { padding: 56px 0 80px; }
.page-header h1 { font-size: clamp(26px, 4vw, 34px); }
.page-header .lead { max-width: 65ch; margin-top: 12px; color: var(--text-muted); }

.section { margin-top: 40px; }
.section > h2 { font-size: 20px; }
.section > p, .section > ul, .section > ol { margin-top: 12px; }
.section p, .section li { color: var(--text-muted); font-size: 15px; }
.section ul { list-style: none; display: grid; gap: 8px; }
.section ol { display: grid; gap: 8px; padding-left: 20px; }
.section li strong { color: var(--text); font-weight: 600; }

/* ── 状态标签：6px 圆点 + 大写小字，颜色与文字双重编码 ── */
.status-list { list-style: none; display: grid; gap: 10px; margin-top: 12px; }
.status-list li { display: flex; align-items: center; gap: 12px; }
.status {
  display: inline-flex; align-items: center; gap: 8px;
  font-size: 12px; font-weight: 700; letter-spacing: .08em; text-transform: uppercase;
  white-space: nowrap;
}
.status::before { content: ""; width: 6px; height: 6px; border-radius: 50%; background: currentColor; flex: none; }
.status-active { color: var(--status-active); }
.status-progress { color: var(--status-progress); }
.status-planned { color: var(--status-planned); }

/* ── 页脚 ─────────────────────────────────────────── */
.site-footer { border-top: 1px solid var(--border); padding: 32px 0 48px; font-size: 14px; color: var(--text-muted); }
.site-footer p + p { margin-top: 6px; }

:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }

/* ── 移动端 <720px：卡片单列，导航折成纵向三行 ── */
@media (max-width: 719px) {
  .hero { padding: 56px 0 40px; }
  .cards { grid-template-columns: 1fr; }
  .nav { flex-direction: column; align-items: flex-start; }
  .nav ul { flex-direction: column; gap: 10px; }
  .actions { flex-direction: column; align-items: stretch; }
}