/* ==================================================================
 * 网站引擎样式 —— 版式、留白、动效生命周期与无障碍行为。
 * 所有颜色、字体栈与动效时长都来自 src/theme.css（由 src/config.ts 生成），
 * 本文件不写死任何内容色值。
 * ================================================================== */

/* ---------- 本地字体：霞鹜文楷 Lite（标题/题签/印章旁题字） ----------
 * 规格指定路径 /mock/fonts/LXGWWenKaiLite-Regular.ttf。把字体文件放进去即生效；
 * 未放入时按 local() 与 config.typography.stack.display 的系统栈回退，全站仍完整可读。 */
@font-face {
  font-family: 'LXGW WenKai Lite';
  src:
    local('LXGW WenKai Lite'),
    local('LXGW WenKai'),
    url('/mock/fonts/LXGWWenKaiLite-Regular.ttf') format('truetype'),
    url('../mock/fonts/LXGWWenKaiLite-Regular.ttf') format('truetype');
  font-weight: 400;
  font-style: normal;
  font-display: swap;
}

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

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

html[data-motion-smooth='off'] { scroll-behavior: auto; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.95;
  letter-spacing: 0.01em;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

body.is-locked { overflow: hidden; }

img { max-width: 100%; display: block; }

a { color: inherit; }

:focus-visible {
  outline: 2px solid var(--vermilion);
  outline-offset: 3px;
}

.visually-hidden {
  position: absolute;
  width: 1px; height: 1px;
  margin: -1px; padding: 0;
  overflow: hidden;
  clip-path: inset(50%);
  white-space: nowrap;
}

.skip-link {
  position: absolute;
  top: -100px;
  left: 12px;
  z-index: 60;
  padding: 10px 16px;
  background: var(--paper-deep);
  border: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 13px;
  text-decoration: none;
}
.skip-link:focus { top: 12px; }

/* ---------- 纸面与纹理 ---------- */
.paper-layer {
  position: fixed;
  inset: 0;
  z-index: -2;
  background:
    radial-gradient(120% 80% at 12% 0%, var(--paper-deep) 0%, transparent 60%),
    radial-gradient(100% 70% at 100% 100%, var(--paper-deep) 0%, transparent 55%),
    var(--paper);
}

.paper-grain {
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  opacity: 0.05;
  background-image: var(--paper-texture-image);
  background-repeat: repeat;
  background-size: 400px 400px;
  mix-blend-mode: multiply;
}

html[data-motion-breathing='on'] .paper-layer {
  animation: paper-breathe var(--breathing-period) ease-in-out infinite;
}
@keyframes paper-breathe {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.94; }
}

/* ---------- 双语呈现 ---------- */
.bi { display: inline; }
.bi__en {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.62em;
  line-height: 1.5;
  letter-spacing: 0.06em;
  text-transform: none;
  color: var(--ink-soft);
  margin-top: 0.35em;
}
.vertical .bi { writing-mode: vertical-rl; }
.vertical .bi__en {
  font-size: 0.42em;
  margin: 0 0 0 0.5em;
  letter-spacing: 0.14em;
}

html[data-lang='zh'] .bi__en { display: none; }
html[data-lang='en'] .bi__zh { display: none; }
html[data-lang='en'] .vertical .bi { writing-mode: horizontal-tb; }

.era-mark, .archive-no, .kicker-en, .figure__label, .figure__cap {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--ink-soft);
}
.archive-no { display: flex; gap: 8px; align-items: baseline; margin: 8px 0 0; }
.archive-no__value { color: var(--vermilion); }

/* ---------- 竖排题签（由 config.typography.verticalTitles 控制） ---------- */
.vertical {
  writing-mode: vertical-rl;
  text-orientation: upright;
  font-family: var(--font-display);
  letter-spacing: 0.22em;
  line-height: 1.35;
}
html[data-vertical-titles='off'] .vertical { writing-mode: horizontal-tb; }

/* 关闭竖排时：所有竖排文字一律转横向，并复位为竖排预留的尺寸与间距 */
html[data-vertical-titles='off'] .vertical,
html[data-vertical-titles='off'] .vertical .bi,
html[data-vertical-titles='off'] .cover__kicker-zh,
html[data-vertical-titles='off'] .kicker-zh,
html[data-vertical-titles='off'] .season__season > .vertical,
html[data-vertical-titles='off'] .seal__text,
html[data-vertical-titles='off'] .toc__short,
html[data-vertical-titles='off'] .toc__short-en {
  writing-mode: horizontal-tb;
  text-orientation: mixed;
}
html[data-vertical-titles='off'] .cover__title,
html[data-vertical-titles='off'] .chapter__title,
html[data-vertical-titles='off'] .theme__title,
html[data-vertical-titles='off'] .coda__title,
html[data-vertical-titles='off'] .overlay__title { min-height: 0; }
html[data-vertical-titles='off'] .vertical { letter-spacing: 0.1em; line-height: 1.45; }
html[data-vertical-titles='off'] .vertical .bi__en { font-size: 0.5em; margin: 0.4em 0 0; }
html[data-vertical-titles='off'] .seal { height: auto; }
html[data-vertical-titles='off'] .seal__text { font-size: 26px; }

/* 横向标题时，左侧导航条目改为横向排布，导轨相应加宽（仅桌面端） */
@media (min-width: 901px) {
  html[data-vertical-titles='off'] .chapter-nav { width: 132px; }
  html[data-vertical-titles='off'] main { margin-left: 132px; }
  html[data-vertical-titles='off'] .toc__labels { flex-direction: column; gap: 2px; }
  html[data-vertical-titles='off'] .toc__short-en { max-width: none; }
}

/* ---------- 左侧竖排导航与进度 ---------- */
.chapter-nav {
  position: fixed;
  top: 0;
  left: 0;
  z-index: 30;
  height: 100vh;
  width: 92px;
  padding: 28px 0 24px;
  display: flex;
  flex-direction: column;
  gap: 18px;
  border-right: 1px solid var(--line);
  background: var(--paper);
}

.toc__heading {
  margin: 0 0 4px;
  padding: 0 14px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--ink-faint);
}
.toc__heading .bi__en { display: inline; margin-left: 6px; font-size: 10px; letter-spacing: 0.08em; }

.toc { list-style: none; margin: 0; padding: 0; overflow-y: auto; flex: 1; }
.toc__item { border-top: 1px solid transparent; }
.toc__link {
  display: flex;
  align-items: flex-start;
  gap: 8px;
  padding: 7px 14px;
  text-decoration: none;
  color: var(--ink-soft);
  font-family: var(--font-display);
  font-size: 13px;
  line-height: 1.1;
  transition: color 0.25s ease;
}
.toc__labels { display: flex; align-items: flex-start; gap: 6px; }
.toc__short-en {
  font-family: var(--font-mono);
  font-size: 9px;
  line-height: 1.25;
  letter-spacing: 0.04em;
  color: var(--ink-faint);
  max-width: 54px;
}
.toc__kicker { font-family: var(--font-mono); font-size: 11px; letter-spacing: 0.1em; }
.toc__short { writing-mode: vertical-rl; text-orientation: upright; letter-spacing: 0.18em; }
.toc__link:hover, .toc__link:focus-visible { color: var(--ink); }
.toc__link.is-active { color: var(--vermilion); }
.toc__link.is-active .toc__kicker { color: var(--vermilion); }

.toc__progress { padding: 0 14px; }
.toc__progress-line { margin: 0; font-family: var(--font-mono); font-size: 12px; color: var(--ink-soft); }
.toc__progress-value { color: var(--ink); }
.toc__lang { padding: 0; }
.toc__lang-button {
  margin: 0 14px;
  padding: 5px 8px;
  border: 1px solid var(--line);
  background: transparent;
  color: var(--ink-soft);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  cursor: pointer;
}
.toc__lang-button:hover { color: var(--ink); border-color: var(--ink-faint); }

.progress-rail {
  position: fixed;
  top: 0;
  right: 0;
  z-index: 25;
  width: 2px;
  height: 100vh;
  background: var(--line);
}
.progress-mark {
  display: block;
  width: 100%;
  height: 100%;
  background: var(--vermilion);
  transform-origin: top center;
  transform: scaleY(0);
}

/* ---------- 主内容容器 ---------- */
main {
  margin-left: 92px;
  padding: 0 clamp(24px, 6vw, 108px);
}
.scroll-section { padding: clamp(64px, 11vh, 150px) 0; border-bottom: 1px solid var(--line); }
.scroll-section:last-child { border-bottom: 0; }

.prose { max-width: 34em; margin: 0 0 1.4em; }
.link-plain {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  text-decoration: none;
  color: var(--vermilion);
  border-bottom: 1px solid color-mix(in srgb, var(--vermilion) 40%, transparent);
  padding-bottom: 2px;
}
.link-plain:hover { border-bottom-color: var(--vermilion); }

/* ---------- 图版 ---------- */
.figure { margin: 0 0 28px; }
.figure__img {
  width: 100%;
  height: auto;
  filter: grayscale(0.22) sepia(0.05) contrast(0.97) brightness(1.01);
  border: 1px solid var(--line);
  background: var(--paper-deep);
}
.figure--hero .figure__img { aspect-ratio: 39 / 16; object-fit: cover; }
.figure--cover .figure__img { aspect-ratio: 7 / 3; object-fit: cover; }
.figure--theme .figure__img,
.figure--season .figure__img { aspect-ratio: 4 / 3; object-fit: cover; }
html[data-motion-parallax='on'] .figure--hero .figure__img,
html[data-motion-parallax='on'] .figure--cover .figure__img { will-change: transform; }
.figure__label, .figure__cap { display: block; margin-top: 10px; }
.figure__cap { color: var(--ink-faint); }

.image-fallback {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 6px;
  padding: 28px;
  border: 1px dashed var(--ink-faint);
  background: var(--paper-deep);
  color: var(--ink-soft);
  font-family: var(--font-mono);
  font-size: 12px;
  text-align: center;
}
.image-fallback__title { margin: 0; letter-spacing: 0.2em; }
.image-fallback__hint { margin: 0; color: var(--ink-faint); }

/* ---------- 封面 ---------- */
.cover { min-height: 100vh; display: flex; align-items: center; border-bottom: 1px solid var(--line); }
.cover__inner { width: 100%; max-width: 1120px; margin: 0 auto; }
.cover__kicker { display: flex; align-items: flex-start; gap: 12px; margin: 0 0 18px; font-size: 15px; color: var(--vermilion); }
.cover__kicker-zh { font-family: var(--font-display); letter-spacing: 0.2em; }
.cover__kicker-en { font-family: var(--font-mono); font-size: 11px; letter-spacing: 0.16em; color: var(--ink-soft); }
.cover__title {
  margin: 0 0 20px;
  font-size: clamp(38px, 7vw, 76px);
  font-weight: 400;
  letter-spacing: 0.2em;
  min-height: 4.2em;
}
.cover__site { margin: 0; font-family: var(--font-display); font-size: 20px; letter-spacing: 0.1em; }
.cover__tagline { margin: 6px 0 26px; color: var(--ink-soft); font-size: 15px; max-width: 30em; }
.cover__archive-label { margin: 0 0 8px; font-family: var(--font-mono); font-size: 12px; letter-spacing: 0.22em; color: var(--ink-soft); }
.cover__lead { margin: 0 0 22px; max-width: 28em; }
.cover__smoke { margin: 0 0 34px; font-size: 15px; color: var(--ink-soft); }
.cover__hint {
  display: inline-block;
  margin-top: 22px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.2em;
  text-decoration: none;
  color: var(--ink-soft);
  border-bottom: 1px solid var(--line);
  padding-bottom: 3px;
}
.cover__hint::after { content: ' ↓'; }

/* ---------- 章节 ---------- */
.chapter__head { max-width: 1120px; margin: 0 auto 46px; }
.chapter__kicker { display: flex; align-items: baseline; gap: 12px; margin: 0 0 14px; }
.kicker-zh { font-size: 15px; color: var(--vermilion); }
.chapter__title {
  margin: 0 0 12px;
  font-size: clamp(28px, 4.4vw, 46px);
  font-weight: 400;
  letter-spacing: 0.16em;
  min-height: 3.6em;
}
.chapter__era { margin: 0; }
.chapter__intro { margin-top: 30px; }
.chapter__actions { margin: 18px 0 0; }

.quote {
  margin: 34px 0;
  padding: 4px 0 4px 22px;
  border-left: 2px solid var(--vermilion);
  max-width: 34em;
}
.quote__text { margin: 0 0 10px; font-size: 18px; }
.quote__label { font-family: var(--font-mono); font-size: 11px; letter-spacing: 0.16em; color: var(--ink-soft); }

/* ---------- 主题切换 ---------- */
.chapter__tabs-wrap { max-width: 1120px; margin: 0 auto 26px; }
.tabs-hint { margin: 0 0 10px; font-family: var(--font-mono); font-size: 11px; letter-spacing: 0.16em; color: var(--ink-faint); }
.theme-tabs { display: flex; flex-wrap: wrap; gap: 10px; border-bottom: 1px solid var(--line); padding-bottom: 12px; }
.theme-tab {
  display: flex;
  align-items: baseline;
  gap: 8px;
  padding: 8px 14px;
  border: 1px solid transparent;
  background: transparent;
  color: var(--ink-soft);
  font-family: var(--font-display);
  font-size: 15px;
  letter-spacing: 0.06em;
  cursor: pointer;
  transition: color 0.25s ease, border-color 0.25s ease;
}
.theme-tab__no { font-family: var(--font-mono); font-size: 11px; color: var(--ink-faint); }
.theme-tab__label .bi__en { display: inline; margin-left: 6px; font-size: 9px; letter-spacing: 0.06em; }
.theme-tab:hover { color: var(--ink); }
.theme-tab[aria-selected='true'] { color: var(--ink); border-color: var(--line); border-bottom-color: var(--paper); }
.theme-tab[aria-selected='true'] .theme-tab__no { color: var(--vermilion); }

.theme-panels { max-width: 1120px; margin: 0 auto; }
.theme { display: grid; grid-template-columns: minmax(260px, 420px) 1fr; gap: clamp(24px, 4vw, 64px); align-items: start; }
.theme__title { margin: 0 0 10px; font-size: clamp(22px, 2.6vw, 30px); font-weight: 400; letter-spacing: 0.18em; min-height: 2.6em; }
.theme__era { margin: 0 0 18px; }
.fields { margin: 0 0 20px; display: grid; gap: 14px; }
.field { display: grid; grid-template-columns: 118px 1fr; gap: 14px; }
.field__label { margin: 0; font-family: var(--font-mono); font-size: 11px; letter-spacing: 0.16em; color: var(--ink-faint); padding-top: 4px; }
.field__label .bi__en { display: inline; margin-left: 5px; font-size: 9px; letter-spacing: 0.08em; }
.field__value { margin: 0; }
.field__value .bi__en { font-size: 0.66em; }

.expander {
  padding: 8px 0;
  border: 0;
  background: transparent;
  color: var(--vermilion);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  cursor: pointer;
  border-bottom: 1px solid color-mix(in srgb, var(--vermilion) 35%, transparent);
}
.theme__detail { margin: 18px 0 0; padding-top: 18px; border-top: 1px solid var(--line); }

/* ---------- 四时记录 ---------- */
.seasons .chapter__head { margin-bottom: 38px; }
.season-list { max-width: 1120px; margin: 0 auto; display: grid; gap: clamp(30px, 5vw, 64px); grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); }
.season { display: flex; flex-direction: column; gap: 12px; }
.season__title { margin: 0; font-size: 22px; font-weight: 400; letter-spacing: 0.18em; }
.season__season { display: flex; align-items: flex-start; gap: 8px; margin: 0; font-size: 14px; color: var(--vermilion); }
.season__season-en { font-family: var(--font-mono); font-size: 11px; letter-spacing: 0.14em; color: var(--ink-faint); }
.seal__en { font-family: var(--font-mono); font-size: 10px; letter-spacing: 0.14em; color: var(--ink-soft); }
.season__era { margin: 0; }
.season .prose { margin-bottom: 0; }

/* ---------- 收束 ---------- */
.coda { text-align: left; max-width: 1120px; margin: 0 auto; }
.coda__title { margin: 30px 0 18px; font-size: clamp(26px, 4vw, 44px); font-weight: 400; letter-spacing: 0.2em; min-height: 3em; }
.coda__note { margin-bottom: 34px; }
.seal {
  position: relative;
  width: 132px;
  height: 132px;
  margin: 0 0 28px;
  display: grid;
  place-items: center;
}
.seal__img { position: absolute; inset: 0; width: 100%; height: 100%; filter: none; border: 0; opacity: 0.9; }
.seal__text {
  position: relative;
  font-family: var(--font-display);
  font-size: 22px;
  letter-spacing: 0.1em;
  color: var(--vermilion);
  writing-mode: vertical-rl;
  text-orientation: upright;
}
.coda__back { margin: 0 0 18px; }
.coda__hint { margin: 0; font-family: var(--font-mono); font-size: 11px; letter-spacing: 0.12em; color: var(--ink-faint); }

/* ---------- 覆盖式卷页（二级详情页） ---------- */
.overlay { position: fixed; inset: 0; z-index: 50; display: grid; }
.overlay[hidden] { display: none; }
.overlay__backdrop { position: absolute; inset: 0; background: color-mix(in srgb, var(--ink) 62%, transparent); }
.overlay__scroll { position: relative; overflow-y: auto; padding: clamp(56px, 8vh, 110px) clamp(20px, 6vw, 120px) 120px; }
.overlay__page {
  max-width: 820px;
  margin: 0 auto;
  background: var(--paper);
  border: 1px solid var(--line);
  padding: clamp(28px, 5vw, 72px);
  box-shadow: 0 24px 60px color-mix(in srgb, var(--ink) 22%, transparent);
}
.overlay__kicker { display: flex; align-items: baseline; gap: 12px; margin: 0 0 14px; }
.overlay__title { margin: 0 0 12px; font-size: clamp(26px, 4vw, 40px); font-weight: 400; letter-spacing: 0.18em; min-height: 3em; }
.overlay__era { margin: 0 0 22px; }
.overlay__subtitle { margin: 40px 0 12px; font-size: 20px; font-weight: 400; letter-spacing: 0.16em; }
.overlay__archive { margin: 42px 0 0; padding-top: 18px; border-top: 1px solid var(--line); }
.overlay__close {
  position: fixed;
  top: 18px;
  right: 22px;
  z-index: 1;
  padding: 9px 16px;
  border: 1px solid var(--line);
  background: var(--paper);
  color: var(--ink-soft);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  cursor: pointer;
}
.overlay__close:hover { color: var(--ink); border-color: var(--ink-faint); }

/* ---------- 滚动揭示与动效生命周期 ---------- */
[data-reveal] { opacity: 0; transform: translateY(var(--reveal-distance)); transition: opacity var(--reveal-duration) ease, transform var(--reveal-duration) ease; transition-delay: var(--reveal-delay, 0ms); }
[data-reveal].is-visible { opacity: 1; transform: none; }
html[data-motion-reveal='off'] [data-reveal] { opacity: 1; transform: none; transition: none; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation: none !important; transition: none !important; }
  [data-reveal] { opacity: 1 !important; transform: none !important; }
  .figure__img { transform: none !important; }
}

/* ---------- 移动端紧凑导航 ---------- */
.mobile-bar { display: none; }
@media (max-width: 900px) {
  body { font-size: 16px; line-height: 1.9; }
  .chapter-nav {
    width: min(78vw, 320px);
    transform: translateX(-102%);
    transition: transform 0.28s ease;
    overflow-y: auto;
    padding-bottom: 60px;
  }
  .chapter-nav.is-open { transform: none; }
  .toc__short { writing-mode: horizontal-tb; }
  .toc__link { font-size: 15px; padding: 11px 16px; }
  .progress-rail { display: none; }
  main { margin-left: 0; padding-top: 54px; }
  .mobile-bar {
    position: fixed;
    top: 0; left: 0; right: 0;
    z-index: 31;
    display: flex;
    align-items: center;
    gap: 12px;
    height: 52px;
    padding: 0 16px;
    border-bottom: 1px solid var(--line);
    background: var(--paper);
  }
  .mobile-bar__toggle {
    padding: 6px 10px;
    border: 1px solid var(--line);
    background: transparent;
    color: var(--ink-soft);
    font-family: var(--font-mono);
    font-size: 12px;
    letter-spacing: 0.1em;
    cursor: pointer;
  }
  .mobile-bar__title { font-family: var(--font-display); font-size: 15px; letter-spacing: 0.12em; }
  .cover { min-height: auto; padding-top: 40px; }
  .cover__title, .chapter__title, .coda__title, .overlay__title { min-height: 0; }
  .theme { grid-template-columns: 1fr; }
  .field { grid-template-columns: 92px 1fr; gap: 10px; }
  .season-list { grid-template-columns: 1fr; }
}