/* 睡眠时间簇 — 单文件样式，无外部依赖（站点 CSP 为 style-src 'self'，禁止内联样式） */
:root {
  --ink: #16202b;
  --muted: #5b6b7c;
  --line: #dde3ea;
  --bg: #f6f8fa;
  --card: #ffffff;
  --brand: #4338ca;
  --brand-dark: #332a9e;
  --night: #1e2a4a;
  --radius: 10px;
}

* { box-sizing: border-box; }

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

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font: 16px/1.65 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", sans-serif;
}

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

.wrap { max-width: 880px; margin: 0 auto; padding: 0 18px; }

.site-header { background: var(--card); border-bottom: 1px solid var(--line); }
.site-header .wrap { display: flex; align-items: center; gap: 16px; min-height: 56px; flex-wrap: wrap; }
.brand { font-weight: 700; font-size: 17px; color: var(--ink); letter-spacing: -0.01em; }
.brand span { color: var(--brand); }
.site-nav { display: flex; gap: 14px; flex-wrap: wrap; font-size: 14px; }
.site-nav a { color: var(--muted); }
.site-nav a:hover { color: var(--brand); }
.site-nav a.is-active { color: var(--brand); font-weight: 600; }

main { padding: 26px 0 40px; }
h1 { font-size: 30px; line-height: 1.25; letter-spacing: -0.02em; margin: 6px 0 10px; }
h2 { font-size: 21px; line-height: 1.35; margin: 34px 0 10px; letter-spacing: -0.01em; }
h3 { font-size: 17px; margin: 22px 0 8px; }
p, li { color: var(--ink); }
.lede { font-size: 17px; color: var(--muted); margin: 0 0 22px; }

.breadcrumbs { font-size: 13px; color: var(--muted); margin: 0 0 4px; }
.breadcrumbs ol { list-style: none; display: flex; gap: 6px; padding: 0; margin: 0; flex-wrap: wrap; }
.breadcrumbs li + li::before { content: "/"; margin-right: 6px; color: #b9c3ce; }

/* 工具 */
.sleep-tool {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 16px;
  margin: 18px 0 8px;
}
.fields { display: grid; gap: 12px; grid-template-columns: repeat(auto-fit, minmax(160px, 1fr)); }
.field label { display: block; font-size: 13px; color: var(--muted); margin-bottom: 4px; }
.field input, .field select {
  width: 100%;
  padding: 9px 10px;
  border: 1px solid var(--line);
  border-radius: 7px;
  background: #fff;
  color: var(--ink);
  font: inherit;
  font-size: 16px;
  min-height: 42px;
}
.field input:focus, .field select:focus {
  outline: 2px solid rgba(67, 56, 202, 0.3);
  outline-offset: 1px;
  border-color: var(--brand);
}

.result {
  margin-top: 16px;
  padding: 16px;
  border-radius: var(--radius);
  background: #f3f2ff;
  border: 1px solid #d9d6f7;
}
.result-pick { font-size: 13px; color: var(--muted); margin: 0 0 8px; }
.result-value {
  font-size: 32px;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--brand-dark);
  font-variant-numeric: tabular-nums;
  display: block;
  line-height: 1.2;
}

.times { list-style: none; margin: 0; padding: 0; display: grid; gap: 8px; }
.time-row {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 12px;
  padding: 9px 12px;
  background: #fff;
  border: 1px solid #e2e0f5;
  border-radius: 8px;
}
.time-value {
  font-size: 24px;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  color: var(--brand-dark);
  letter-spacing: 0.01em;
}
.time-meta { font-size: 13px; color: var(--muted); }
.bar-caption { font-size: 13px; color: var(--muted); margin: 10px 0 0; }

/* 表格 */
table {
  width: 100%;
  border-collapse: collapse;
  margin: 12px 0 6px;
  font-size: 15px;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}
th, td { text-align: left; padding: 9px 12px; border-bottom: 1px solid var(--line); }
th { background: #f0f3f7; font-size: 13px; text-transform: uppercase; letter-spacing: 0.03em; color: var(--muted); }
tr:last-child td { border-bottom: none; }
td.num, th.num { text-align: right; font-variant-numeric: tabular-nums; }

/* 说明块 */
.callout {
  border-left: 3px solid var(--brand);
  background: #f3f2ff;
  padding: 12px 14px;
  border-radius: 0 8px 8px 0;
  margin: 16px 0;
  font-size: 15px;
}
.callout p:first-child { margin-top: 0; }
.callout p:last-child { margin-bottom: 0; }
.callout.is-warn { border-left-color: #a3561a; background: #fdf3e8; }

details.faq {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 10px 14px;
  margin: 10px 0;
}
details.faq summary { cursor: pointer; font-weight: 600; }
details.faq p { color: var(--muted); margin: 8px 0 2px; }

.related { margin: 30px 0 0; padding: 16px 18px; background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); }
.related h2 { margin: 0 0 8px; font-size: 16px; }
.related ul { margin: 0; padding-left: 18px; columns: 2; column-gap: 24px; }
.related li { margin: 3px 0; }

code, .formula {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 14px;
  background: #eef1f5;
  padding: 2px 6px;
  border-radius: 5px;
}
.formula { display: block; padding: 10px 12px; margin: 10px 0; overflow-x: auto; }

.index { margin-top: 34px; }
.index h2 { margin-top: 0; }
.index-group { border-top: 1px solid var(--line); margin-top: 14px; padding-top: 12px; }
.index-group h3 { margin: 0 0 6px; font-size: 13px; color: var(--muted); text-transform: uppercase; letter-spacing: 0.04em; }
.index-group ul { margin: 0; padding-left: 18px; columns: 2; column-gap: 24px; }
.index-group li { margin: 3px 0; }

.site-footer { border-top: 1px solid var(--line); background: var(--card); padding: 18px 0 26px; font-size: 13px; color: var(--muted); }
.site-footer p { color: var(--muted); margin: 4px 0; }

@media (max-width: 640px) {
  h1 { font-size: 24px; }
  .result-value { font-size: 26px; }
  .time-value { font-size: 21px; }
  .related ul { columns: 1; }
}