/* Shared reading-mode chrome: tokens, typography, nav, type controls. */
:root {
  --bg: #faf8f3;
  --bg-elevated: #faf8f3;
  --bg-panel: transparent;
  --ink: #222222;
  --ink-muted: #6b6b66;
  --ink-faint: #8a8a84;
  --hairline: #e6e2d8;
  --hairline-strong: #d4cfc4;
  --border: var(--hairline);
  --border-strong: var(--hairline-strong);
  --accent: #c45a16;
  --accent-soft: transparent;
  --accent-text: #222222;
  --shadow: none;
  --shadow-sm: none;
  --header-bg: rgba(250, 248, 243, 0.92);
  --focus: #222222;
  --radius: 0;
  --radius-sm: 0;
  --measure: 700px;
  --max: 700px;
  --max-wide: 700px;
  --font-sans: "PingFang SC", "Hiragino Sans GB", "Noto Sans CJK SC", "Noto Sans SC", "Source Han Sans SC", "Microsoft YaHei", system-ui, sans-serif;
  --font-serif: "Songti SC", "STSong", "Noto Serif CJK SC", "Noto Serif SC", "Source Han Serif SC", "Source Han Serif CN", "SimSun", "Georgia", serif;
  --font-ui: var(--font-sans);
  --font-body: var(--font-serif);
  --font: var(--font-body);
  --mono: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  --text-size: 18.5px;
  --text-size-mobile: 17px;
  --line: 1.8;
  --tracking: 0.03em;
  --danger: #8a3a32;
  --ok: #3d6b46;
  --rank-bg: transparent;
  --rank-fg: var(--ink-faint);
  --must-rank-bg: transparent;
  --must-rank-fg: var(--ink-faint);
  --quote-border: var(--hairline-strong);
}

[data-theme="dark"] {
  --bg: #1b1b1d;
  --bg-elevated: #1b1b1d;
  --bg-panel: transparent;
  --ink: #dddddd;
  --ink-muted: #9a9a96;
  --ink-faint: #7a7a76;
  --hairline: #2e2e32;
  --hairline-strong: #3c3c42;
  --border: var(--hairline);
  --border-strong: var(--hairline-strong);
  --accent: #e08a4c;
  --accent-soft: transparent;
  --accent-text: #dddddd;
  --header-bg: rgba(27, 27, 29, 0.92);
  --focus: #dddddd;
  --danger: #e0a8a4;
  --ok: #8fcd98;
  --rank-fg: var(--ink-faint);
  --must-rank-fg: var(--ink-faint);
  --quote-border: var(--hairline-strong);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #1b1b1d;
    --bg-elevated: #1b1b1d;
    --bg-panel: transparent;
    --ink: #dddddd;
    --ink-muted: #9a9a96;
    --ink-faint: #7a7a76;
    --hairline: #2e2e32;
    --hairline-strong: #3c3c42;
    --border: var(--hairline);
    --border-strong: var(--hairline-strong);
    --accent: #e08a4c;
    --accent-soft: transparent;
    --accent-text: #dddddd;
    --header-bg: rgba(27, 27, 29, 0.92);
    --focus: #dddddd;
    --danger: #e0a8a4;
    --ok: #8fcd98;
    --rank-fg: var(--ink-faint);
    --must-rank-fg: var(--ink-faint);
    --quote-border: var(--hairline-strong);
  }
}

html[data-font="sans"] { --font-body: var(--font-sans); --font: var(--font-sans); }
html[data-font="serif"] { --font-body: var(--font-serif); --font: var(--font-serif); }

html[data-size="sm"] {
  --text-size: 16.5px;
  --text-size-mobile: 16px;
}
html[data-size="md"] {
  --text-size: 18.5px;
  --text-size-mobile: 17px;
}
html[data-size="lg"] {
  --text-size: 21px;
  --text-size-mobile: 19.5px;
}

*, *::before, *::after { box-sizing: border-box; }

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

body {
  margin: 0;
  font-family: var(--font-body);
  font-size: var(--text-size);
  font-synthesis: none;
  line-height: var(--line);
  letter-spacing: var(--tracking);
  background: var(--bg);
  color: var(--ink);
  min-height: 100vh;
}

@media (max-width: 640px) {
  body { font-size: var(--text-size-mobile); }
}

a {
  color: inherit;
  text-decoration-thickness: 1px;
  text-underline-offset: 0.18em;
}
a:hover { color: var(--accent); }

:focus-visible {
  outline: 1px solid var(--focus);
  outline-offset: 2px;
}

.skip-link {
  position: absolute;
  left: 12px;
  top: -48px;
  background: var(--ink);
  color: var(--bg);
  padding: 4px 10px;
  z-index: 80;
  font-family: var(--font-ui);
  font-size: 13px;
  letter-spacing: 0;
  text-decoration: none;
}
.skip-link:focus { top: 10px; }

/* ----- quiet text nav ----- */
.hn-site-nav {
  position: sticky;
  top: 0;
  z-index: 50;
  background: var(--header-bg);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--hairline);
  font-family: var(--font-ui);
  letter-spacing: 0;
  font-size: 13px;
  line-height: 1.4;
}
.hn-site-nav-inner {
  max-width: var(--measure);
  margin: 0 auto;
  padding: 10px 24px;
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
}
.hn-brand {
  color: inherit;
  text-decoration: none;
  font-weight: 500;
  letter-spacing: 0.02em;
}
.hn-brand:hover { color: inherit; }
.hn-brand-mark { display: none; }
.hn-nav-links {
  display: flex;
  align-items: center;
  gap: 14px;
  flex: 1;
}
.hn-nav-links a {
  color: var(--ink-muted);
  text-decoration: none;
  padding: 0;
  border-radius: 0;
  font-size: 13px;
  font-weight: 400;
}
.hn-nav-links a:hover { color: var(--ink); background: none; }
.hn-nav-links a.is-active {
  color: var(--ink);
  background: none;
  font-weight: 500;
}
.hn-nav-actions {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-left: auto;
  font-family: var(--font-ui);
}
.hn-progress-chip {
  font-size: 12px;
  color: var(--ink-faint);
  background: none;
  border: 0;
  border-radius: 0;
  padding: 0;
  white-space: nowrap;
}

.btn,
button.theme-toggle,
[data-theme-toggle],
.hn-type-toggle,
.hn-read-btn,
.hn-day-bar .btn {
  appearance: none;
  font-family: var(--font-ui);
  font-size: 13px;
  font-weight: 400;
  letter-spacing: 0;
  border: 0;
  background: none;
  color: var(--ink-muted);
  border-radius: 0;
  padding: 0;
  cursor: pointer;
  line-height: 1.4;
  box-shadow: none;
}
.btn:hover,
[data-theme-toggle]:hover,
.hn-type-toggle:hover,
.hn-read-btn:hover,
.hn-day-bar .btn:hover {
  color: var(--ink);
  border-color: transparent;
}
.btn-primary {
  background: none;
  border: 0;
  color: var(--ink);
  font-weight: 500;
}
.btn-primary:hover { color: var(--accent); filter: none; }
.btn-ghost { background: transparent; }
.btn[aria-disabled="true"] {
  color: var(--ink-faint);
  cursor: default;
  pointer-events: none;
}

/* ----- Aa typography control ----- */
.hn-type-ctrl { position: relative; }
.hn-type-toggle {
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0.02em;
  padding: 2px 0;
}
.hn-type-panel {
  position: absolute;
  right: 0;
  top: calc(100% + 8px);
  min-width: 168px;
  background: var(--bg);
  border: 1px solid var(--hairline);
  padding: 10px 12px 12px;
  z-index: 60;
  font-family: var(--font-ui);
  letter-spacing: 0;
}
.hn-type-panel[hidden] { display: none; }
.hn-type-label {
  display: block;
  font-size: 11px;
  color: var(--ink-faint);
  margin: 0 0 6px;
}
.hn-type-row {
  display: flex;
  gap: 0;
  margin: 0 0 10px;
  border-bottom: 1px solid var(--hairline);
}
.hn-type-row:last-of-type { margin-bottom: 0; }
.hn-type-row button {
  appearance: none;
  flex: 1;
  font-family: inherit;
  font-size: 13px;
  border: 0;
  background: none;
  color: var(--ink-muted);
  padding: 5px 0 8px;
  cursor: pointer;
}
.hn-type-row button:hover { color: var(--ink); }
.hn-type-row button.is-on {
  color: var(--ink);
  box-shadow: inset 0 -1px 0 var(--ink);
}

.site-footer {
  max-width: var(--measure);
  margin: 0 auto;
  padding: 8px 24px 40px;
  color: var(--ink-faint);
  font-family: var(--font-ui);
  font-size: 12px;
  letter-spacing: 0;
  line-height: 1.6;
}

@media (max-width: 640px) {
  .hn-site-nav-inner { padding: 8px 16px; gap: 10px; }
  .hn-progress-chip { display: none; }
  .site-footer { padding: 8px 16px 32px; }
}