/* 天工开悟官网
   视觉：明代刻本的版面语言——竖排标题、版框与界行、朱红印章；标题用宋体（明朝体，源自明代刻书字形）。
   色：月白纸、墨、靛青（彰施·蓝靛）、赭铜（冶铸）、朱砂（只给印章）。 */

@font-face {
  font-family: "TGKW Ming";
  src: url("fonts/tgkw-ming-400.woff2") format("woff2");
  font-weight: 400;
  font-display: swap;
}
@font-face {
  font-family: "TGKW Ming";
  src: url("fonts/tgkw-ming-700.woff2") format("woff2");
  font-weight: 700;
  font-display: swap;
}

:root {
  --paper: #eef1ec;
  --paper-deep: #e3e8e1;
  --ink: #1c1f24;
  --ink-soft: #4a4f57;
  --indigo: #24395c;
  --bronze: #8c6a43;
  --seal: #c8322b;
  --rule: rgba(36, 57, 92, 0.22);
  --rule-strong: rgba(36, 57, 92, 0.55);
  --serif: "TGKW Ming", "Songti SC", "STSong", "Noto Serif SC", "Source Han Serif SC", serif;
  --sans: -apple-system, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  --measure: 34em;
  --gutter: clamp(20px, 5vw, 64px);
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font: 400 17px/1.85 var(--sans);
  text-rendering: optimizeLegibility;
}
a { color: var(--indigo); text-underline-offset: 3px; text-decoration-thickness: 1px; }
a:hover { color: var(--ink); }
:focus-visible { outline: 2px solid var(--indigo); outline-offset: 3px; border-radius: 2px; }
img { max-width: 100%; display: block; }
.skip { position: absolute; left: -999px; }
.skip:focus { left: 16px; top: 12px; background: var(--paper); padding: 6px 12px; z-index: 10; }

/* 顶栏 */
.bar {
  display: flex; align-items: center; justify-content: space-between; gap: 16px;
  padding: 18px var(--gutter);
  max-width: 1240px; margin: 0 auto;
}
.brand { display: flex; align-items: center; gap: 10px; color: var(--ink); text-decoration: none; font: 700 19px/1 var(--serif); letter-spacing: 0.08em; }
.brand img { width: 30px; height: 30px; }
.bar nav { display: flex; gap: clamp(14px, 3vw, 32px); font-size: 15px; }
.bar nav a { color: var(--ink-soft); text-decoration: none; }
.bar nav a:hover { color: var(--indigo); }

/* 首屏：版框 + 竖排标题 */
.hero {
  max-width: 1240px; margin: 0 auto;
  padding: clamp(24px, 6vh, 72px) var(--gutter) clamp(56px, 10vh, 120px);
  display: grid; grid-template-columns: auto minmax(0, 1fr); gap: clamp(32px, 7vw, 112px); align-items: center;
}
.folio {
  position: relative;
  border: 2px solid var(--indigo);
  outline: 1px solid var(--indigo); outline-offset: 5px;
  padding: 28px 22px;
  display: flex; flex-direction: row-reverse; gap: 0;
  /* 界行：竖分各行的细线 */
  background-image: repeating-linear-gradient(to left, transparent 0 calc(var(--col) - 1px), var(--rule) calc(var(--col) - 1px) var(--col));
  --col: clamp(64px, 9vw, 108px);
}
.folio h1 {
  margin: 0;
  writing-mode: vertical-rl;
  font: 700 clamp(56px, 8.4vw, 104px)/1 var(--serif);
  letter-spacing: 0.28em;
  color: var(--ink);
  width: var(--col);
  display: flex; align-items: center;
  padding-top: 0.14em;
}
.folio .colophon {
  writing-mode: vertical-rl;
  width: var(--col);
  font: 400 clamp(14px, 1.5vw, 17px)/var(--col) var(--serif);
  color: var(--ink-soft);
  letter-spacing: 0.32em;
  text-align: start;
  padding-top: 0.6em;
}
.seal {
  position: absolute;
  width: clamp(64px, 8vw, 96px);
  left: calc(-1 * clamp(28px, 3vw, 40px));
  bottom: calc(-1 * clamp(20px, 2.4vw, 32px));
  mix-blend-mode: multiply;
}
.hero-copy { max-width: 30em; }
.hero-copy p.lead {
  margin: 0 0 22px;
  font: 700 clamp(26px, 3.2vw, 40px)/1.5 var(--serif);
  color: var(--ink);
  letter-spacing: 0.02em;
}
.hero-copy p.sub { margin: 0 0 34px; color: var(--ink-soft); max-width: var(--measure); }
.actions { display: flex; flex-wrap: wrap; gap: 14px 22px; align-items: center; }
.button {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 12px 26px;
  background: var(--indigo); color: var(--paper);
  border-radius: 2px; text-decoration: none; font-weight: 600; letter-spacing: 0.04em;
}
.button:hover { background: var(--ink); color: var(--paper); }
.text-link { font-size: 16px; }

/* 通用章节 */
section.block { max-width: 1240px; margin: 0 auto; padding: clamp(56px, 9vw, 112px) var(--gutter); }
.block + .block { border-top: 1px solid var(--rule); }
h2 {
  margin: 0 0 28px;
  font: 700 clamp(28px, 3.4vw, 42px)/1.35 var(--serif);
  letter-spacing: 0.03em;
  max-width: 18em;
}
.prose p { margin: 0 0 1.1em; max-width: var(--measure); }
.prose .note { font-size: 14px; color: var(--ink-soft); }
blockquote {
  margin: 1.6em 0; padding: 0 0 0 1.1em;
  border-left: 2px solid var(--bronze);
  font: 400 19px/1.9 var(--serif); color: var(--ink);
  max-width: var(--measure);
}

/* 产品演示：像书里的插图一样编号、配图注 */
.plate-wrap { max-width: 1240px; margin: 0 auto; padding: 0 var(--gutter) clamp(56px, 9vw, 112px); }
.plate { margin: 0; }
.window {
  border: 1px solid var(--rule-strong);
  outline: 1px solid var(--rule); outline-offset: 6px;
  background: #1f2024;
  border-radius: 10px; overflow: hidden;
  box-shadow: 0 30px 60px -30px rgba(28, 31, 36, 0.45);
}
.window video, .window img { width: 100%; height: auto; display: block; }
figcaption { font-size: 15px; line-height: 1.8; color: var(--ink-soft); }
.plate figcaption { margin: 22px auto 0; max-width: 46em; text-align: center; }
.fig-no { font: 700 15px/1 var(--serif); color: var(--bronze); letter-spacing: 0.2em; margin-right: 0.9em; }

/* 功能：文字 + 截图 */
h3 { margin: 0 0 12px; font: 700 23px/1.5 var(--serif); letter-spacing: 0.02em; }
.feature {
  display: grid; grid-template-columns: minmax(0, 0.85fr) minmax(0, 1.15fr);
  gap: clamp(28px, 5vw, 80px); align-items: center;
  padding: clamp(28px, 4vw, 48px) 0;
}
.feature + .feature { border-top: 1px solid var(--rule); }
.feature:nth-of-type(even) .feature-text { order: 2; }
.feature-text p { margin: 0 0 1em; color: var(--ink-soft); max-width: var(--measure); }
.feature-media { margin: 0; }
.feature-media img { border: 1px solid var(--rule-strong); border-radius: 8px; width: 100%; height: auto; background: #1f2024; }
.feature-media figcaption { margin-top: 12px; }
.more {
  margin: clamp(28px, 4vw, 48px) 0 0; padding-top: clamp(28px, 4vw, 48px);
  border-top: 1px solid var(--rule);
  display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 24px clamp(24px, 4vw, 56px);
}
.more dt { font: 700 20px/1.5 var(--serif); margin: 0 0 8px; }
.more dd { margin: 0; color: var(--ink-soft); }

/* 名字的由来：正文 + 竖排目录 */
.origin { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1.1fr); gap: clamp(32px, 6vw, 96px); align-items: start; }
.toc { border: 1px solid var(--rule-strong); background: var(--paper-deep); }
.toc-head { display: flex; justify-content: space-between; align-items: baseline; padding: 12px 18px; border-bottom: 1px solid var(--rule-strong); font: 700 17px/1.4 var(--serif); }
.toc-head small { font: 400 13px/1.4 var(--sans); color: var(--ink-soft); }
.toc-parts { display: flex; flex-direction: row-reverse; }
.toc-part { flex: 1; display: flex; flex-direction: row-reverse; border-left: 1px solid var(--rule); }
.toc-part:last-child { border-left: 0; }
.toc-part > h3 {
  writing-mode: vertical-rl; margin: 0; padding: 14px 8px;
  font: 700 15px/1 var(--serif); color: var(--bronze); letter-spacing: 0.4em;
  border-left: 1px solid var(--rule);
}
.toc-part ol { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: row-reverse; flex: 1; }
.toc-part li {
  flex: 1; writing-mode: vertical-rl; padding: 14px 0;
  border-left: 1px solid var(--rule); display: flex; align-items: center; gap: 10px;
  min-height: 15.5em;
}
.toc-part li:last-child { border-left: 0; }
.toc-part b { font: 700 19px/1 var(--serif); letter-spacing: 0.18em; color: var(--ink); }
.toc-part span { font: 400 12.5px/1 var(--sans); letter-spacing: 0.12em; color: var(--ink-soft); }

/* 传承：时间线（真实的先后顺序） */
.timeline { list-style: none; margin: 8px 0 0; padding: 0; position: relative; display: grid; grid-template-columns: repeat(6, minmax(0, 1fr)); gap: 0 24px; }
.timeline::before { content: ""; position: absolute; left: 0; right: 0; top: 11px; height: 1px; background: var(--bronze); }
.timeline li { position: relative; padding-top: 38px; }
.timeline li::before {
  content: ""; position: absolute; top: 4px; left: 0; width: 15px; height: 15px;
  border: 2px solid var(--bronze); background: var(--paper); border-radius: 50%;
}
.timeline li.now::before { background: var(--seal); border-color: var(--seal); }
.timeline .when { display: block; font: 700 22px/1.3 var(--serif); color: var(--bronze); margin-bottom: 8px; }
.timeline li.now .when { color: var(--seal); }
.timeline p { margin: 0; font-size: 15.5px; line-height: 1.8; color: var(--ink-soft); }

/* 今天做什么：定义列表 */
.capabilities { display: grid; grid-template-columns: minmax(0, 0.8fr) minmax(0, 1.2fr); gap: clamp(32px, 6vw, 96px); }
.capabilities dl { margin: 0; }
.capabilities dt { font: 700 21px/1.5 var(--serif); margin: 0 0 6px; color: var(--ink); }
.capabilities dd { margin: 0 0 30px; color: var(--ink-soft); max-width: var(--measure); }
.capabilities dd:last-child { margin-bottom: 0; }

/* 结尾 */
.closing { text-align: center; }
.closing p.verse {
  margin: 0 auto 36px; max-width: 22em;
  font: 700 clamp(24px, 3vw, 36px)/1.7 var(--serif); letter-spacing: 0.04em;
}
.closing .actions { justify-content: center; }

/* 页脚 */
footer {
  max-width: 1240px; margin: 0 auto; padding: 36px var(--gutter) 48px;
  border-top: 1px solid var(--rule-strong);
  display: flex; flex-wrap: wrap; justify-content: space-between; gap: 16px 32px;
  font-size: 14px; color: var(--ink-soft);
}
footer nav { display: flex; flex-wrap: wrap; gap: 8px 24px; }
footer a { color: var(--ink-soft); }

/* 法律文本页 */
.doc { max-width: 820px; margin: 0 auto; padding: 32px var(--gutter) 96px; }
.doc header { border-bottom: 2px solid var(--indigo); padding-bottom: 20px; margin-bottom: 32px; }
.doc h1 { margin: 0 0 10px; font: 700 clamp(30px, 4vw, 40px)/1.35 var(--serif); letter-spacing: 0.04em; }
.doc .meta { margin: 0; font-size: 14px; color: var(--ink-soft); }
.doc .meta a { margin-left: 12px; }
.doc h2 { font-size: 22px; margin: 44px 0 14px; max-width: none; }
.doc h3 { font: 700 17px/1.6 var(--sans); margin: 24px 0 8px; }
.doc p, .doc li { max-width: 40em; }
.doc ul { padding-left: 1.3em; }
.doc li { margin-bottom: 0.4em; }
.doc .callout { border-left: 3px solid var(--indigo); background: var(--paper-deep); padding: 14px 18px; margin: 18px 0; }
.doc .callout p { margin: 0; }

/* 页面打开时：标题出现，印章盖上（唯一的一处动效） */
@media (prefers-reduced-motion: no-preference) {
  .folio h1 { animation: ink 900ms ease-out both; }
  .seal { animation: stamp 520ms cubic-bezier(.2, .9, .3, 1.25) 820ms both; }
  @keyframes ink { from { opacity: 0; filter: blur(3px); } to { opacity: 1; filter: none; } }
  @keyframes stamp { from { opacity: 0; transform: scale(1.6) rotate(-8deg); } to { opacity: 1; transform: none; } }
}

/* 窄屏 */
@media (max-width: 900px) {
  .hero { grid-template-columns: 1fr; }
  .folio { justify-self: center; }
  .origin, .capabilities, .feature, .more { grid-template-columns: minmax(0, 1fr); }
  .feature:nth-of-type(even) .feature-text { order: 0; }
  .timeline { grid-template-columns: 1fr; gap: 0; }
  .timeline::before { left: 7px; right: auto; top: 0; bottom: 0; width: 1px; height: auto; }
  .timeline li { padding: 0 0 28px 36px; }
  .timeline li::before { top: 6px; }
}
@media (max-width: 560px) {
  body { font-size: 16px; }
  .bar nav a.hide-sm { display: none; }
  .toc-part li { min-height: 12em; }
  .toc-part b { font-size: 16px; }
  .toc-part span { display: none; }
}