/* reader.css — 章节阅读器样式 (round-014)
 * 行宽 max 700px (中文 ~38 字/行) · 字号 19px · 行高 1.95 · 段间距 1.5em
 * 字体优先 PingFang SC / Microsoft YaHei / Noto Sans CJK SC
 * 暗色模式跟随 prefers-color-scheme
 */

:root {
  --r-paper: #f6f1e8;
  --r-paper-2: #ede4d3;
  --r-ink: #1a1a1a;
  --r-ink-2: #34302a;
  --r-muted: #71695f;
  --r-line: #cfc0aa;
  --r-rust: #a74428;
  --r-teal: #286f71;
  --r-night: #111316;
  --r-serif: "Songti SC", "Noto Serif CJK SC", "STSong", Georgia, serif;
  --r-sans: "PingFang SC", "Microsoft YaHei", "Noto Sans CJK SC", "Noto Sans SC", system-ui, sans-serif;
  --r-mono: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  --r-max: 700px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --r-paper: #16181c;
    --r-paper-2: #1d2026;
    --r-ink: #e9e3d6;
    --r-ink-2: #d4ccba;
    --r-muted: #8a8275;
    --r-line: #2c2f36;
    --r-rust: #d68463;
    --r-teal: #6cc1c3;
    --r-night: #0c0d10;
  }
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--r-paper);
  color: var(--r-ink);
  font: 400 19px/1.95 var(--r-sans);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

a { color: inherit; text-decoration-color: rgba(167,68,40,.4); text-underline-offset: 4px; }
a:hover { color: var(--r-rust); text-decoration-color: var(--r-rust); }

.reader-shell {
  width: min(var(--r-max), calc(100% - 36px));
  margin: 0 auto;
}

.reader-top {
  position: sticky;
  top: 0;
  z-index: 10;
  background: rgba(17,19,22,.92);
  color: rgba(255,255,255,.84);
  border-bottom: 1px solid rgba(255,255,255,.12);
  backdrop-filter: blur(10px) saturate(130%);
}
@media (prefers-color-scheme: dark) {
  .reader-top { background: rgba(0,0,0,.78); }
}
.reader-top .reader-shell {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 52px;
}
.reader-top .brand {
  font-family: var(--r-serif);
  font-size: 18px;
  letter-spacing: .08em;
  color: #fff;
  text-decoration: none;
}
.reader-top .progress {
  font-family: var(--r-mono);
  font-size: 13px;
  color: rgba(255,255,255,.66);
}

.reader-nav {
  border-bottom: 1px solid var(--r-line);
  background: var(--r-paper-2);
}
.reader-nav.bottom { border-top: 1px solid var(--r-line); border-bottom: 0; padding-bottom: 8px; }
.reader-nav .reader-shell {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  min-height: 54px;
  font-size: 14px;
  font-family: var(--r-mono);
}
.reader-nav .progress-line {
  display: block;
  text-align: center;
  color: var(--r-muted);
  font-size: 13px;
  padding: 6px 0 4px;
}
.nav-link {
  text-decoration: none;
  color: var(--r-ink-2);
  padding: 6px 10px;
  border-radius: 4px;
  border: 1px solid transparent;
}
.nav-link:hover { color: var(--r-rust); border-color: var(--r-line); }
.nav-link.disabled { color: var(--r-muted); opacity: .45; pointer-events: none; }

.reader-main {
  padding: 36px 0 24px;
}
.chapter {
  width: min(var(--r-max), calc(100% - 36px));
  margin: 0 auto;
}
.chapter-title {
  font-family: var(--r-serif);
  font-weight: 500;
  font-size: clamp(28px, 5vw, 38px);
  line-height: 1.25;
  letter-spacing: .02em;
  margin: 0 0 1.4em;
  padding-bottom: .5em;
  border-bottom: 1px solid var(--r-line);
  color: var(--r-ink);
}

.chapter h2 {
  font-family: var(--r-serif);
  font-size: 24px;
  margin: 2em 0 .8em;
}
.chapter h3 {
  font-size: 21px;
  margin: 1.8em 0 .6em;
  color: var(--r-ink);
}
.chapter h4 {
  font-size: 18px;
  margin: 1.6em 0 .4em;
  color: var(--r-ink-2);
}

.chapter p {
  margin: 0 0 1.5em;
  text-align: justify;
  text-justify: inter-ideograph;
}

.chapter blockquote {
  margin: 1.6em 0;
  padding: .8em 1.2em;
  border-left: 3px solid var(--r-rust);
  background: var(--r-paper-2);
  color: var(--r-ink-2);
}
.chapter blockquote p:last-child { margin-bottom: 0; }

.chapter ul, .chapter ol {
  margin: 0 0 1.5em;
  padding-left: 1.6em;
}
.chapter li {
  margin: .4em 0;
}

.chapter hr {
  margin: 2.2em auto;
  width: 60px;
  border: 0;
  border-top: 1px solid var(--r-line);
}
.chapter hr::after {
  content: "· · ·";
  display: block;
  text-align: center;
  color: var(--r-muted);
  margin-top: -.6em;
  background: var(--r-paper);
  padding: 0 8px;
  width: max-content;
  margin-left: auto;
  margin-right: auto;
  font-family: var(--r-mono);
  font-size: 12px;
  letter-spacing: .3em;
}

.chapter code {
  font-family: var(--r-mono);
  font-size: .9em;
  color: var(--r-rust);
  background: var(--r-paper-2);
  padding: 1px 5px;
  border-radius: 3px;
}
.chapter pre {
  background: var(--r-paper-2);
  border: 1px solid var(--r-line);
  padding: 14px 16px;
  border-radius: 4px;
  overflow-x: auto;
  font-size: 14px;
  line-height: 1.6;
  margin: 1.6em 0;
}
.chapter pre code {
  background: transparent;
  padding: 0;
  color: var(--r-ink);
}

.chapter strong { font-weight: 600; color: var(--r-ink); }
.chapter em { font-style: italic; color: var(--r-ink-2); }

.reader-footer {
  border-top: 1px solid var(--r-line);
  padding: 28px 0 60px;
  margin-top: 24px;
  color: var(--r-muted);
  font-size: 14px;
}
.reader-footer p { margin: 0 0 6px; }
.reader-footer .muted { color: var(--r-muted); font-size: 13px; }
.reader-footer code {
  font-family: var(--r-mono);
  font-size: .9em;
  color: var(--r-rust);
}

@media (max-width: 720px) {
  body { font-size: 19px; line-height: 1.92; }
  .reader-shell { width: calc(100% - 28px); }
  .chapter { width: calc(100% - 28px); }
  .chapter-title { font-size: 26px; line-height: 1.3; }
  .reader-top .reader-shell { min-height: 48px; }
  .reader-top .brand { font-size: 16px; }
  .reader-top .progress { font-size: 12px; }
  .reader-nav .reader-shell { font-size: 13px; min-height: 56px; }
  .nav-link {
    padding: 12px 12px;
    min-height: 44px;
    display: inline-flex;
    align-items: center;
    border: 1px solid var(--r-line);
    background: var(--r-paper);
  }
  .reader-main { padding: 24px 0 18px; }
  .chapter h2 { font-size: 22px; }
  .chapter h3 { font-size: 19px; }
  .chapter pre { font-size: 13px; padding: 12px; }
  .reader-footer { padding: 22px 0 48px; }
}

@media (max-width: 380px) {
  body { font-size: 18px; line-height: 1.9; }
  .reader-shell, .chapter { width: calc(100% - 22px); }
  .chapter-title { font-size: 24px; }
  .reader-top .brand { font-size: 15px; }
  .nav-link { padding: 11px 8px; font-size: 12.5px; }
}

/* Touch-only refinements for reader */
@media (hover: none) and (pointer: coarse) {
  .nav-link { min-height: 44px; padding: 10px 12px; display: inline-flex; align-items: center; }
}

/* iOS Safari sticky stability — ensure transform context */
.reader-top { transform: translateZ(0); will-change: transform; }