/* ==========================================================================
   天美影视 · 全站样式
   分组：base / layout / components / pages / responsive
   ========================================================================== */

/* --------------------------------------------------------------------------
   base
   -------------------------------------------------------------------------- */

:root {
  --paper: #f7f5f0;
  --card: #ffffff;
  --ink: #1b2b30;
  --ink-soft: #55666b;
  --teal: #14636b;
  --teal-deep: #0f4d54;
  --ochre: #b5722a;
  --line: #dcd8ce;
  --term-bg: #eef1ee;

  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", "Source Han Sans SC", "Noto Sans CJK SC", sans-serif;
  --font-mono: "SFMono-Regular", Menlo, Consolas, "Liberation Mono", "Courier New", monospace;

  --shell: 960px;
  --col-main: 720px;
  --col-aside: 240px;
  --gap: 24px;
  --radius: 2px;
}

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

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

body.site-body {
  margin: 0;
  padding: 0;
  background-color: var(--paper);
  color: var(--ink);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.75;
  font-weight: 400;
}

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

a {
  color: var(--teal);
  text-decoration: none;
}

a:hover,
a:focus-visible {
  color: var(--ochre);
  text-decoration: underline;
}

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

h1,
h2,
h3,
h4 {
  margin: 0;
  color: var(--ink);
  font-weight: 700;
  line-height: 1.35;
}

p {
  margin: 0 0 14px;
}

p:last-child {
  margin-bottom: 0;
}

ul,
ol,
dl {
  margin: 0;
  padding: 0;
}

li {
  list-style: none;
}

code {
  font-family: var(--font-mono);
  font-size: 14px;
  letter-spacing: 0.02em;
  color: var(--teal-deep);
  background-color: var(--term-bg);
  padding: 1px 5px;
  border-radius: var(--radius);
}

figure {
  margin: 0;
}

figcaption {
  margin-top: 8px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--ink-soft);
}

table {
  border-collapse: collapse;
  width: 100%;
}

/* --------------------------------------------------------------------------
   layout · 骨架
   -------------------------------------------------------------------------- */

.site-header {
  background-color: var(--card);
  border-bottom: 1px solid var(--line);
  position: sticky;
  top: 0;
  z-index: 40;
}

.header-inner {
  max-width: var(--shell);
  margin: 0 auto;
  padding: 0 24px;
  min-height: 64px;
  display: flex;
  align-items: center;
  gap: 20px;
  flex-wrap: wrap;
}

.brand {
  display: inline-flex;
  flex-direction: column;
  justify-content: center;
  gap: 2px;
  padding: 10px 0;
  color: var(--ink);
  text-decoration: none;
  min-height: 44px;
}

.brand:hover,
.brand:focus-visible {
  color: var(--ink);
  text-decoration: none;
}

.brand-name {
  font-size: 19px;
  font-weight: 700;
  letter-spacing: 0;
  color: var(--teal-deep);
}

.brand-slogan {
  font-size: 12px;
  line-height: 1.4;
  color: var(--ink-soft);
}

.nav-toggle {
  display: none;
  margin-left: auto;
  width: 44px;
  height: 44px;
  padding: 0;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background-color: var(--card);
  color: var(--ink);
  font-family: var(--font-sans);
  font-size: 13px;
  cursor: pointer;
  position: relative;
}

.nav-toggle::before {
  content: "";
  position: absolute;
  top: 14px;
  left: 11px;
  width: 20px;
  height: 2px;
  background-color: var(--ink);
  box-shadow: 0 6px 0 var(--ink), 0 12px 0 var(--ink);
}

.nav-toggle:hover,
.nav-toggle:focus-visible {
  border-color: var(--teal);
}

.site-nav {
  margin-left: auto;
}

.site-nav ul {
  display: flex;
  align-items: center;
  gap: 4px;
}

.site-nav a {
  display: inline-block;
  padding: 0 12px;
  line-height: 44px;
  font-size: 15px;
  color: var(--ink-soft);
  border-bottom: 2px solid transparent;
  text-decoration: none;
  white-space: nowrap;
}

.site-nav a:hover,
.site-nav a:focus-visible {
  color: var(--teal-deep);
  text-decoration: none;
  background-color: var(--term-bg);
}

.site-nav a.is-current {
  color: var(--teal-deep);
  font-weight: 700;
  border-bottom-color: var(--teal);
}

.site-main {
  display: block;
}

.home-main {
  max-width: var(--shell);
  margin: 0 auto;
  padding: 0 24px 56px;
}

.inner-main {
  max-width: var(--shell);
  margin: 0 auto;
  padding: 28px 24px 48px;
  min-width: 0;
}

.breadcrumb {
  font-size: 13px;
  line-height: 1.6;
  color: var(--ink-soft);
  margin-bottom: 14px;
}

.breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px;
}

.breadcrumb li {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.breadcrumb li + li::before {
  content: "/";
  color: var(--line);
}

.breadcrumb a {
  color: var(--ink-soft);
  text-decoration: none;
}

.breadcrumb a:hover,
.breadcrumb a:focus-visible {
  color: var(--teal);
  text-decoration: underline;
}

.breadcrumb-sep {
  color: var(--line);
  padding: 0 2px;
}

.breadcrumb-current {
  color: var(--ink);
}

.page-header {
  border-bottom: 1px solid var(--line);
  padding-bottom: 18px;
  margin-bottom: 18px;
}

.page-title {
  font-size: 32px;
  font-weight: 700;
  line-height: 1.3;
  color: var(--ink);
  margin: 0;
  overflow-wrap: break-word;
}

.page-lead {
  margin: 10px 0 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--ink-soft);
}

.page-meta {
  margin: 10px 0 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--ink-soft);
  display: flex;
  flex-wrap: wrap;
  gap: 6px 14px;
}

.meta-label {
  display: inline-block;
}

.meta-sep {
  color: var(--line);
}

.page-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) var(--col-aside);
  gap: var(--gap) 32px;
  align-items: start;
}

.page-layout > .inner-main,
.page-layout > .content-col,
.page-layout > .content-column,
.page-layout > .content-main {
  min-width: 0;
  max-width: var(--col-main);
  padding: 0;
  margin: 0;
}

.page-aside {
  min-width: 0;
  border-left: 1px solid var(--line);
  padding-left: 20px;
  position: sticky;
  top: 80px;
}

.aside-title {
  font-size: 14px;
  font-weight: 700;
  color: var(--ink);
  margin: 0 0 10px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--line);
}

.page-toc ul,
.toc-list {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.page-toc a,
.toc-list a,
.toc-link {
  display: block;
  padding: 7px 8px;
  font-size: 14px;
  line-height: 1.5;
  color: var(--ink-soft);
  border-left: 2px solid transparent;
  border-radius: var(--radius);
  text-decoration: none;
}

.page-toc a:hover,
.page-toc a:focus-visible,
.toc-list a:hover,
.toc-list a:focus-visible,
.toc-link:hover,
.toc-link:focus-visible {
  color: var(--teal-deep);
  background-color: var(--term-bg);
  border-left-color: var(--teal);
  text-decoration: none;
}

.page-toc a.is-active,
.toc-list a.is-active,
.toc-link.is-active {
  color: var(--teal-deep);
  font-weight: 600;
  border-left-color: var(--teal);
  background-color: var(--term-bg);
}

.aside-note,
.toc-note {
  margin-top: 16px;
  padding: 12px;
  background-color: var(--term-bg);
  border-radius: var(--radius);
  font-size: 13px;
  line-height: 1.7;
  color: var(--ink-soft);
}

.aside-note h3 {
  font-size: 13px;
  font-weight: 700;
  color: var(--ink);
  margin: 0 0 6px;
}

.aside-extra {
  margin-top: 20px;
  padding-top: 16px;
  border-top: 1px solid var(--line);
}

.aside-links {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.aside-links a {
  display: block;
  padding: 7px 8px;
  font-size: 14px;
  line-height: 1.5;
  color: var(--ink-soft);
  text-decoration: none;
  border-radius: var(--radius);
}

.aside-links a:hover,
.aside-links a:focus-visible {
  color: var(--teal-deep);
  background-color: var(--term-bg);
  text-decoration: none;
}

.page-neighbors {
  max-width: var(--shell);
  margin: 0 auto;
  padding: 0 24px 40px;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
}

.neighbor-prev,
.neighbor-next {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 14px 16px;
  background-color: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  text-decoration: none;
  color: var(--ink);
  min-height: 44px;
}

.neighbor-prev:hover,
.neighbor-next:hover,
.neighbor-prev:focus-visible,
.neighbor-next:focus-visible {
  border-color: var(--teal);
  background-color: var(--term-bg);
  text-decoration: none;
  color: var(--ink);
}

.neighbor-next {
  text-align: right;
  align-items: flex-end;
}

.neighbor-label,
.neighbor-dir {
  font-size: 12px;
  font-family: var(--font-mono);
  letter-spacing: 0.02em;
  color: var(--ink-soft);
}

.neighbor-title,
.neighbor-name {
  font-size: 15px;
  font-weight: 600;
  color: var(--teal-deep);
  line-height: 1.5;
}

.neighbor-desc {
  font-size: 13px;
  line-height: 1.6;
  color: var(--ink-soft);
}

/* 页脚 */

.site-footer {
  background-color: var(--card);
  border-top: 1px solid var(--line);
  color: var(--ink-soft);
}

.footer-inner {
  max-width: var(--shell);
  margin: 0 auto;
  padding: 36px 24px 24px;
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 24px;
}

.footer-col-title {
  font-size: 14px;
  font-weight: 700;
  color: var(--ink);
  margin: 0 0 10px;
}

.footer-col ul {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.footer-col a {
  display: inline-block;
  padding: 3px 0;
  font-size: 14px;
  line-height: 1.6;
  color: var(--ink-soft);
  text-decoration: none;
}

.footer-col a:hover,
.footer-col a:focus-visible {
  color: var(--teal);
  text-decoration: underline;
}

.footer-bottom {
  max-width: var(--shell);
  margin: 0 auto;
  padding: 16px 24px 28px;
  border-top: 1px solid var(--line);
  display: flex;
  flex-wrap: wrap;
  gap: 6px 20px;
  justify-content: space-between;
  font-size: 13px;
  line-height: 1.7;
}

.footer-brand {
  margin: 0;
  font-weight: 600;
  color: var(--ink);
}

.footer-note {
  margin: 0;
  color: var(--ink-soft);
}

/* --------------------------------------------------------------------------
   components · 通用模块
   -------------------------------------------------------------------------- */

.section-head {
  margin-bottom: 18px;
}

.section-head h2 {
  font-size: 20px;
  font-weight: 700;
  color: var(--ink);
  margin: 0 0 6px;
}

.section-head p {
  font-size: 14px;
  line-height: 1.7;
  color: var(--ink-soft);
  margin: 0;
  max-width: 640px;
}

.section-intro {
  font-size: 14px;
  line-height: 1.75;
  color: var(--ink-soft);
  margin: 0 0 16px;
}

/* 频道标签 */

.channel-tag,
.topic-channel,
.scene-tag,
.faq-group-tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.02em;
  line-height: 1.6;
  color: var(--teal-deep);
  background-color: var(--term-bg);
  border-radius: var(--radius);
  padding: 1px 7px;
}

/* 表格 */

.table-scroll {
  width: 100%;
  overflow-x: auto;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background-color: var(--card);
}

.channel-table {
  min-width: 620px;
  font-size: 14px;
  line-height: 1.65;
}

.channel-table caption {
  caption-side: top;
  text-align: left;
  padding: 12px 14px 0;
  font-size: 13px;
  color: var(--ink-soft);
}

.channel-table th,
.channel-table td {
  padding: 11px 14px;
  text-align: left;
  vertical-align: top;
  border-bottom: 1px solid var(--line);
}

.channel-table thead th {
  font-size: 14px;
  font-weight: 600;
  color: var(--ink);
  background-color: var(--term-bg);
  border-bottom: 1px solid var(--line);
  white-space: nowrap;
}

.channel-table tbody th {
  font-weight: 600;
  color: var(--teal-deep);
  white-space: nowrap;
}

.channel-table tbody tr:last-child th,
.channel-table tbody tr:last-child td {
  border-bottom: 0;
}

.channel-table tbody tr:hover {
  background-color: #fbfaf6;
}

.channel-table tbody tr:hover th {
  box-shadow: inset 2px 0 0 var(--teal);
}

.channel-table a {
  color: var(--teal-deep);
  text-decoration: none;
}

.channel-table a:hover,
.channel-table a:focus-visible {
  text-decoration: underline;
}

.table-note {
  margin: 10px 0 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--ink-soft);
}

/* 场景卡 */

.scenario-cards,
.scenario-grid {
  display: grid;
  gap: 16px;
}

.scenario-cards {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.scenario-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
  margin-bottom: 14px;
}

.scenario-card {
  background-color: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 16px 16px 18px;
  min-width: 0;
}

.scenario-card:hover {
  background-color: #fbfaf6;
  box-shadow: inset 2px 0 0 var(--teal);
}

.scenario-card h3 {
  font-size: 16px;
  font-weight: 600;
  color: var(--ink);
  margin: 0 0 8px;
}

.scenario-card p {
  font-size: 14px;
  line-height: 1.7;
  color: var(--ink-soft);
  margin: 0 0 8px;
}

.scenario-combo,
.scenario-channels {
  font-size: 14px;
  line-height: 1.7;
  color: var(--ink);
  margin: 0 0 8px;
}

.scenario-channels .term {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.02em;
  color: var(--teal-deep);
  background-color: var(--term-bg);
  padding: 1px 5px;
  border-radius: var(--radius);
}

.scenario-path,
.topic-more,
.flow-more,
.faq-more {
  margin: 16px 0 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--ink-soft);
}

.scenario-path a,
.topic-more a,
.flow-more a,
.faq-more a {
  color: var(--teal);
  text-decoration: none;
  border-bottom: 1px solid var(--line);
}

.scenario-path a:hover,
.topic-more a:hover,
.flow-more a:hover,
.faq-more a:hover,
.scenario-path a:focus-visible,
.topic-more a:focus-visible,
.flow-more a:focus-visible,
.faq-more a:focus-visible {
  color: var(--ochre);
  border-bottom-color: var(--ochre);
  text-decoration: none;
}

/* 折叠问答 */

.faq-teaser {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.faq-teaser details,
.faq-item {
  background-color: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.faq-teaser summary,
.faq-item summary {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  flex-wrap: wrap;
  padding: 12px 16px;
  min-height: 44px;
  font-size: 15px;
  font-weight: 600;
  line-height: 1.6;
  color: var(--ink);
  cursor: pointer;
  list-style: none;
}

.faq-teaser summary::-webkit-details-marker,
.faq-item summary::-webkit-details-marker {
  display: none;
}

.faq-teaser summary::after,
.faq-item summary::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 16px;
  color: var(--teal);
  line-height: 1.4;
}

.faq-teaser details[open] summary::after,
.faq-item[open] summary::after {
  content: "–";
}

.faq-teaser summary:hover,
.faq-item summary:hover {
  background-color: #fbfaf6;
}

.faq-teaser details > p {
  padding: 0 16px 14px;
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--ink-soft);
}

/* --------------------------------------------------------------------------
   pages · 首页
   -------------------------------------------------------------------------- */

.home-main .page-toc {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
  padding: 14px 0;
  border-bottom: 1px solid var(--line);
  margin-bottom: 24px;
}

.toc-label {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.02em;
  color: var(--ink-soft);
  white-space: nowrap;
}

.home-main .page-toc ul {
  display: flex;
  flex-wrap: wrap;
  gap: 4px 4px;
}

.home-main .page-toc a {
  display: inline-block;
  padding: 6px 10px;
  font-size: 14px;
  line-height: 1.5;
  color: var(--ink-soft);
  border: 1px solid transparent;
  border-radius: var(--radius);
  text-decoration: none;
}

.home-main .page-toc a:hover,
.home-main .page-toc a:focus-visible {
  color: var(--teal-deep);
  background-color: var(--term-bg);
  border-color: var(--line);
  text-decoration: none;
}

.home-main .page-toc a.is-active {
  color: var(--teal-deep);
  font-weight: 600;
  background-color: var(--term-bg);
  border-color: var(--teal);
}

/* 编辑部头条 */

.lead-story {
  display: grid;
  grid-template-columns: minmax(0, 2fr) minmax(0, 1fr);
  gap: 24px;
  margin-bottom: 44px;
}

.lead-main {
  min-width: 0;
}

.lead-primary {
  background-color: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}

.lead-media {
  aspect-ratio: 16 / 9;
  background-color: var(--term-bg);
  overflow: hidden;
}

.lead-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.lead-body {
  padding: 18px 20px 20px;
}

.lead-body .channel-tag {
  margin-bottom: 8px;
}

.lead-body h1 {
  font-size: 28px;
  font-weight: 700;
  line-height: 1.35;
  color: var(--ink);
  margin: 0 0 10px;
  overflow-wrap: break-word;
}

.lead-intro {
  font-size: 15px;
  line-height: 1.75;
  color: var(--ink-soft);
  margin: 0 0 14px;
}

.lead-cta {
  display: inline-block;
  padding: 9px 18px;
  min-height: 44px;
  line-height: 26px;
  font-size: 15px;
  font-weight: 600;
  color: #ffffff;
  background-color: var(--teal);
  border-radius: var(--radius);
  text-decoration: none;
}

.lead-cta:hover,
.lead-cta:focus-visible {
  background-color: var(--teal-deep);
  color: #ffffff;
  text-decoration: none;
}

.lead-side {
  display: flex;
  flex-direction: column;
  gap: 16px;
  min-width: 0;
}

.lead-secondary {
  display: grid;
  grid-template-columns: 96px minmax(0, 1fr);
  gap: 12px;
  background-color: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 10px;
  min-width: 0;
}

.lead-secondary:hover {
  background-color: #fbfaf6;
  box-shadow: inset 2px 0 0 var(--teal);
}

.lead-thumb {
  width: 96px;
  height: 72px;
  border-radius: var(--radius);
  overflow: hidden;
  background-color: var(--term-bg);
}

.lead-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.lead-secondary-body {
  min-width: 0;
}

.lead-secondary-body .channel-tag {
  margin-bottom: 4px;
}

.lead-secondary-title {
  font-size: 15px;
  font-weight: 600;
  line-height: 1.5;
  margin: 0 0 4px;
}

.lead-secondary-title a {
  color: var(--ink);
  text-decoration: none;
}

.lead-secondary-title a:hover,
.lead-secondary-title a:focus-visible {
  color: var(--teal-deep);
  text-decoration: underline;
}

.lead-secondary-body p {
  margin: 0;
  font-size: 13px;
  line-height: 1.65;
  color: var(--ink-soft);
}

/* 首页各区块间距 */

.channel-table-section,
.scenario-section,
.topic-preview-section,
.labeling-flow-section,
.glossary-section,
.faq-teaser-section {
  margin-bottom: 44px;
}

/* 专题预览 */

.topic-preview-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
}

.topic-card {
  background-color: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  min-width: 0;
  padding: 0 0 14px;
}

.topic-card:hover {
  background-color: #fbfaf6;
  box-shadow: inset 2px 0 0 var(--teal);
}

.topic-thumb,
.topic-media {
  aspect-ratio: 16 / 10;
  background-color: var(--term-bg);
  overflow: hidden;
}

.topic-thumb img,
.topic-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.topic-card .channel-tag {
  margin: 12px 14px 6px;
}

.topic-card h3 {
  font-size: 16px;
  font-weight: 600;
  line-height: 1.5;
  margin: 0 14px 6px;
}

.topic-card h3 a {
  color: var(--ink);
  text-decoration: none;
}

.topic-card h3 a:hover,
.topic-card h3 a:focus-visible {
  color: var(--teal-deep);
  text-decoration: underline;
}

.topic-meta {
  margin: 0 14px 6px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.02em;
  color: var(--ink-soft);
}

.topic-card > p:not(.topic-meta) {
  margin: 0 14px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--ink-soft);
}

/* 标注四步流程 */

.labeling-flow {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 16px;
  counter-reset: flow;
}

.labeling-flow li {
  background-color: var(--card);
  border: 1px solid var(--line);
  border-top: 2px solid var(--teal);
  border-radius: var(--radius);
  padding: 14px 14px 16px;
  min-width: 0;
}

.flow-num {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.02em;
  color: var(--teal-deep);
  background-color: var(--term-bg);
  border-radius: var(--radius);
  padding: 1px 7px;
  margin-bottom: 8px;
}

.labeling-flow h3 {
  font-size: 15px;
  font-weight: 600;
  color: var(--ink);
  margin: 0 0 6px;
}

.labeling-flow p {
  margin: 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--ink-soft);
}

/* 术语对照 */

.glossary {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px 24px;
}

.glossary-item {
  display: grid;
  grid-template-columns: 110px minmax(0, 1fr);
  gap: 12px;
  align-items: baseline;
  padding: 12px 0;
  border-top: 1px solid var(--line);
  min-width: 0;
}

.glossary-item dt {
  min-width: 0;
}

.glossary-item dd {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--ink-soft);
  min-width: 0;
}

/* --------------------------------------------------------------------------
   pages · 内页共用内容块
   -------------------------------------------------------------------------- */

.content-section,
.note-section,
.rules-block,
.rules-intro,
.faq-group,
.topic-cards,
.reading-order,
.role-division,
.related-links {
  margin-bottom: 36px;
}

.content-section h2,
.note-section h2,
.rules-block h2,
.rules-intro h2,
.faq-group h2,
.topic-cards h2,
.reading-order h2,
.role-division h2,
.related-links h2 {
  font-size: 20px;
  font-weight: 700;
  color: var(--ink);
  margin: 0 0 10px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--line);
}

.content-section h3,
.note-section h3,
.rules-block h3,
.faq-group h3 {
  font-size: 16px;
  font-weight: 600;
  color: var(--ink);
  margin: 0 0 6px;
}

.content-section p,
.note-section p,
.rules-block p,
.rules-intro p,
.faq-group p {
  font-size: 15px;
  line-height: 1.75;
  color: var(--ink);
}

.content-figure,
.note-figure,
.rules-figure,
.page-figure {
  margin: 0 0 16px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background-color: var(--card);
  overflow: hidden;
}

.content-figure img,
.note-figure img,
.rules-figure img,
.page-figure img {
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 9;
  object-fit: cover;
}

.content-figure figcaption,
.note-figure figcaption,
.rules-figure figcaption,
.page-figure figcaption {
  margin: 0;
  padding: 8px 14px 10px;
  font-size: 13px;
  line-height: 1.65;
  color: var(--ink-soft);
  border-top: 1px solid var(--line);
}

/* 归类边界 */

.boundary-list {
  display: grid;
  grid-template-columns: minmax(0, 160px) minmax(0, 1fr);
  gap: 0;
  border-top: 1px solid var(--line);
}

.boundary-list dt {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.02em;
  color: var(--teal-deep);
  padding: 12px 12px 12px 0;
  border-bottom: 1px solid var(--line);
}

.boundary-list dd {
  margin: 0;
  padding: 12px 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--ink-soft);
  border-bottom: 1px solid var(--line);
  min-width: 0;
}

/* 检查清单 */

.check-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin: 14px 0 0;
}

.check-list li {
  display: grid;
  grid-template-columns: 132px minmax(0, 1fr);
  gap: 12px;
  padding: 12px 14px;
  background-color: var(--card);
  border: 1px solid var(--line);
  border-left: 2px solid var(--teal);
  border-radius: var(--radius);
  min-width: 0;
}

.check-name {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.02em;
  color: var(--teal-deep);
}

.check-list p {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--ink-soft);
}

/* 入口辨识 */

.entry-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin: 0;
}

.entry-list li {
  display: grid;
  grid-template-columns: 132px minmax(0, 1fr);
  gap: 12px;
  padding: 12px 14px;
  background-color: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  min-width: 0;
}

.entry-name {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.02em;
  color: var(--teal-deep);
}

.entry-list p {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--ink-soft);
}

/* 字段定义 */

.field-list {
  display: grid;
  grid-template-columns: minmax(0, 150px) minmax(0, 1fr);
  border-top: 1px solid var(--line);
  margin: 14px 0;
}

.field-list dt {
  padding: 11px 12px 11px 0;
  border-bottom: 1px solid var(--line);
  min-width: 0;
}

.field-list dd {
  margin: 0;
  padding: 11px 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--ink-soft);
  border-bottom: 1px solid var(--line);
  min-width: 0;
}

.note-tail {
  font-size: 14px;
  line-height: 1.75;
  color: var(--ink-soft);
}

/* 记录表 */

.record-table {
  font-size: 14px;
  line-height: 1.65;
  border: 1px solid var(--line);
  background-color: var(--card);
  margin: 14px 0;
  border-radius: var(--radius);
  overflow: hidden;
}

.record-table caption {
  caption-side: top;
  text-align: left;
  padding: 0 0 8px;
  font-size: 13px;
  color: var(--ink-soft);
}

.record-table th,
.record-table td {
  padding: 10px 12px;
  text-align: left;
  vertical-align: top;
  border-bottom: 1px solid var(--line);
}

.record-table thead th {
  font-weight: 600;
  color: var(--ink);
  background-color: var(--term-bg);
  white-space: nowrap;
}

.record-table tbody tr:last-child th,
.record-table tbody tr:last-child td {
  border-bottom: 0;
}

/* 规则条目 */

.rule-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin: 14px 0;
}

.rule-item {
  background-color: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 14px 16px;
  min-width: 0;
}

.rule-item h3 {
  font-size: 15px;
  font-weight: 600;
  color: var(--ink);
  margin: 0 0 6px;
}

.rule-item p {
  margin: 0 0 8px;
  font-size: 14px;
  line-height: 1.75;
  color: var(--ink-soft);
}

.rule-item p:last-child {
  margin-bottom: 0;
}

.rule-sample {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.02em;
  line-height: 1.7;
  color: var(--teal-deep);
  background-color: var(--term-bg);
  border-left: 2px solid var(--teal);
  border-radius: var(--radius);
  padding: 8px 12px;
  overflow-wrap: anywhere;
}

.rules-note {
  font-size: 14px;
  line-height: 1.75;
  color: var(--ink-soft);
  margin: 12px 0 0;
}

/* 专题卡片（专题档案页） */

.topic-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
}

.topic-grid .topic-card {
  display: flex;
  flex-direction: column;
  padding: 0;
}

.topic-body {
  padding: 12px 14px 16px;
  min-width: 0;
}

.topic-body .topic-channel {
  margin-bottom: 6px;
}

.topic-name {
  font-size: 16px;
  font-weight: 600;
  color: var(--ink);
  margin: 0 0 6px;
  line-height: 1.5;
}

.topic-count,
.topic-order {
  margin: 0 0 4px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--ink-soft);
}

.topic-count {
  font-family: var(--font-mono);
  letter-spacing: 0.02em;
}

/* 阅读顺序 */

.order-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin: 0;
}

.order-item {
  display: grid;
  grid-template-columns: 40px minmax(0, 1fr);
  gap: 14px;
  padding: 14px 16px;
  background-color: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  min-width: 0;
}

.order-num {
  font-family: var(--font-mono);
  font-size: 16px;
  letter-spacing: 0.02em;
  color: var(--teal);
  line-height: 1.6;
}

.order-body {
  min-width: 0;
}

.order-body h3 {
  font-size: 15px;
  font-weight: 600;
  color: var(--ink);
  margin: 0 0 4px;
}

.order-body p {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--ink-soft);
}

/* 专题与频道分工 */

.division-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
  margin-bottom: 14px;
}

.division-col {
  background-color: var(--card);
  border: 1px solid var(--line);
  border-top: 2px solid var(--teal);
  border-radius: var(--radius);
  padding: 14px 16px 16px;
  min-width: 0;
}

.division-col h3 {
  font-size: 15px;
  font-weight: 600;
  color: var(--ink);
  margin: 0 0 8px;
}

.division-col ul {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.division-col li {
  position: relative;
  padding-left: 14px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--ink-soft);
}

.division-col li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 11px;
  width: 5px;
  height: 5px;
  background-color: var(--teal);
}

.division-note {
  font-size: 14px;
  line-height: 1.75;
  color: var(--ink-soft);
  margin: 0;
}

/* 相关链接 */

.link-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.link-list a {
  display: block;
  padding: 10px 14px;
  background-color: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  font-size: 14px;
  line-height: 1.7;
  color: var(--teal-deep);
  text-decoration: none;
  min-height: 44px;
}

.link-list a:hover,
.link-list a:focus-visible {
  background-color: var(--term-bg);
  border-color: var(--teal);
  text-decoration: none;
}

/* 常见问题分组 */

.faq-group .section-intro {
  margin-bottom: 12px;
}

.faq-group .faq-item {
  margin-bottom: 8px;
}

.faq-group .faq-item:last-child {
  margin-bottom: 0;
}

.faq-item summary {
  font-size: 15px;
}

.faq-answer {
  padding: 0 16px 14px;
}

.faq-answer p {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--ink-soft);
}

.faq-answer a {
  color: var(--teal);
  text-decoration: underline;
}

/* --------------------------------------------------------------------------
   pages · 404
   -------------------------------------------------------------------------- */

.error-main {
  max-width: var(--shell);
  margin: 0 auto;
  padding: 48px 24px 56px;
}

.error-block {
  border-bottom: 1px solid var(--line);
  padding-bottom: 24px;
  margin-bottom: 32px;
}

.error-code {
  font-family: var(--font-mono);
  font-size: 14px;
  letter-spacing: 0.02em;
  color: var(--ochre);
  margin: 0 0 8px;
}

.error-block h1 {
  font-size: 32px;
  font-weight: 700;
  line-height: 1.3;
  color: var(--ink);
  margin: 0 0 10px;
}

.error-lead {
  font-size: 15px;
  line-height: 1.75;
  color: var(--ink-soft);
  margin: 0;
  max-width: 640px;
}

.error-paths {
  margin-bottom: 32px;
}

.error-paths h2 {
  font-size: 20px;
  font-weight: 700;
  color: var(--ink);
  margin: 0 0 14px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--line);
}

.error-path-list {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
}

.error-path-item {
  background-color: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 16px;
  min-width: 0;
}

.error-path-item h3 {
  font-size: 15px;
  font-weight: 600;
  color: var(--ink);
  margin: 0 0 6px;
}

.error-path-item p {
  font-size: 14px;
  line-height: 1.7;
  color: var(--ink-soft);
  margin: 0 0 10px;
}

.error-path-item a {
  display: inline-block;
  font-size: 14px;
  line-height: 1.6;
  color: var(--teal);
  text-decoration: none;
  border-bottom: 1px solid var(--line);
  padding: 4px 0;
}

.error-path-item a:hover,
.error-path-item a:focus-visible {
  color: var(--ochre);
  border-bottom-color: var(--ochre);
  text-decoration: none;
}

.error-note {
  border-top: 1px solid var(--line);
  padding-top: 20px;
}

.error-note h2 {
  font-size: 20px;
  font-weight: 700;
  color: var(--ink);
  margin: 0 0 10px;
}

.error-note p {
  font-size: 14px;
  line-height: 1.75;
  color: var(--ink-soft);
  margin: 0 0 12px;
  max-width: 640px;
}

.error-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin: 0;
}

.btn-home,
.btn-rules {
  display: inline-block;
  padding: 10px 20px;
  min-height: 44px;
  line-height: 24px;
  font-size: 15px;
  font-weight: 600;
  border-radius: var(--radius);
  text-decoration: none;
}

.btn-home {
  color: #ffffff;
  background-color: var(--teal);
}

.btn-home:hover,
.btn-home:focus-visible {
  background-color: var(--teal-deep);
  color: #ffffff;
  text-decoration: none;
}

.btn-rules {
  color: var(--teal-deep);
  background-color: var(--card);
  border: 1px solid var(--line);
}

.btn-rules:hover,
.btn-rules:focus-visible {
  border-color: var(--teal);
  background-color: var(--term-bg);
  color: var(--teal-deep);
  text-decoration: none;
}

/* --------------------------------------------------------------------------
   responsive
   -------------------------------------------------------------------------- */

@media (max-width: 960px) {
  .header-inner {
    padding: 0 18px;
  }

  .home-main,
  .inner-main,
  .error-main {
    padding-left: 18px;
    padding-right: 18px;
  }

  .page-layout {
    grid-template-columns: minmax(0, 1fr);
    gap: 28px;
  }

  .page-layout > .inner-main,
  .page-layout > .content-col,
  .page-layout > .content-column,
  .page-layout > .content-main {
    max-width: none;
  }

  .page-aside {
    position: static;
    border-left: 0;
    border-top: 1px solid var(--line);
    padding-left: 0;
    padding-top: 16px;
  }

  .lead-story {
    grid-template-columns: minmax(0, 1fr);
    gap: 16px;
  }

  .lead-side {
    flex-direction: row;
    flex-wrap: wrap;
  }

  .lead-side .lead-secondary {
    flex: 1 1 260px;
  }

  .topic-preview-grid,
  .scenario-cards,
  .scenario-grid,
  .error-path-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .labeling-flow {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .footer-inner {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    padding: 32px 18px 20px;
  }

  .footer-bottom {
    padding: 16px 18px 24px;
  }

  .page-neighbors {
    padding: 0 18px 32px;
  }
}

@media (max-width: 640px) {
  .site-header {
    position: sticky;
  }

  .header-inner {
    padding: 0 16px;
    gap: 0;
    min-height: 60px;
    flex-wrap: wrap;
    align-items: center;
  }

  .brand {
    padding: 8px 0;
    flex: 1 1 auto;
    min-width: 0;
  }

  .brand-name {
    font-size: 17px;
  }

  .brand-slogan {
    font-size: 11px;
  }

  .nav-toggle {
    display: block;
    flex: 0 0 auto;
  }

  .site-nav {
    flex: 0 0 100%;
    width: 100%;
    margin-left: 0;
    display: block;
    max-height: 0;
    overflow: hidden;
    border-top: 1px solid transparent;
  }

  .site-nav.is-open {
    max-height: none;
    overflow: visible;
    border-top-color: var(--line);
    padding-bottom: 8px;
  }

  .site-nav ul {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    width: 100%;
  }

  .site-nav li {
    width: 100%;
    border-bottom: 1px solid var(--line);
  }

  .site-nav li:last-child {
    border-bottom: 0;
  }

  .site-nav a {
    display: block;
    width: 100%;
    padding: 0 4px;
    line-height: 44px;
    min-height: 44px;
    font-size: 15px;
    border-bottom: 0;
    border-left: 2px solid transparent;
  }

  .site-nav a.is-current {
    border-left-color: var(--teal);
    border-bottom: 0;
    background-color: var(--term-bg);
  }

  .home-main,
  .inner-main,
  .error-main {
    padding-left: 16px;
    padding-right: 16px;
  }

  .inner-main {
    padding-top: 20px;
    padding-bottom: 32px;
  }

  .page-title,
  .error-block h1 {
    font-size: 26px;
  }

  .page-header {
    padding-bottom: 14px;
    margin-bottom: 14px;
  }

  .page-lead {
    font-size: 14px;
  }

  .home-main .page-toc {
    gap: 8px;
    padding: 12px 0;
    margin-bottom: 18px;
  }

  .home-main .page-toc ul {
    gap: 4px;
  }

  .home-main .page-toc a {
    padding: 6px 8px;
    font-size: 13px;
    min-height: 36px;
  }

  .lead-story {
    margin-bottom: 32px;
  }

  .lead-body {
    padding: 14px 16px 16px;
  }

  .lead-body h1 {
    font-size: 22px;
  }

  .lead-intro {
    font-size: 14px;
  }

  .lead-cta {
    width: 100%;
    text-align: center;
  }

  .lead-side {
    flex-direction: column;
  }

  .lead-side .lead-secondary {
    flex: 1 1 auto;
  }

  .lead-secondary {
    grid-template-columns: 84px minmax(0, 1fr);
  }

  .lead-thumb {
    width: 84px;
    height: 64px;
  }

  .channel-table-section,
  .scenario-section,
  .topic-preview-section,
  .labeling-flow-section,
  .glossary-section,
  .faq-teaser-section,
  .content-section,
  .note-section,
  .rules-block,
  .rules-intro,
  .faq-group,
  .topic-cards,
  .reading-order,
  .role-division,
  .related-links {
    margin-bottom: 30px;
  }

  .topic-preview-grid,
  .scenario-cards,
  .scenario-grid,
  .topic-grid,
  .division-grid,
  .error-path-list,
  .labeling-flow,
  .glossary {
    grid-template-columns: minmax(0, 1fr);
  }

  .labeling-flow li {
    border-top-width: 2px;
  }

  .glossary-item {
    grid-template-columns: minmax(0, 1fr);
    gap: 4px;
    padding: 10px 0;
  }

  .boundary-list {
    grid-template-columns: minmax(0, 1fr);
  }

  .boundary-list dt {
    padding: 10px 0 2px;
    border-bottom: 0;
  }

  .boundary-list dd {
    padding: 0 0 10px;
  }

  .check-list li,
  .entry-list li {
    grid-template-columns: minmax(0, 1fr);
    gap: 4px;
  }

  .field-list {
    grid-template-columns: minmax(0, 1fr);
  }

  .field-list dt {
    padding: 10px 0 2px;
    border-bottom: 0;
  }

  .field-list dd {
    padding: 0 0 10px;
  }

  .order-item {
    grid-template-columns: 32px minmax(0, 1fr);
    gap: 10px;
    padding: 12px 14px;
  }

  .table-scroll {
    border-radius: var(--radius);
  }

  .channel-table {
    min-width: 560px;
    font-size: 13px;
  }

  .channel-table th,
  .channel-table td {
    padding: 9px 10px;
  }

  .record-table {
    display: block;
    overflow-x: auto;
    white-space: nowrap;
  }

  .record-table th,
  .record-table td {
    white-space: normal;
    min-width: 120px;
  }

  .rule-item {
    padding: 12px 14px;
  }

  .rule-sample {
    font-size: 12px;
    padding: 8px 10px;
  }

  .page-neighbors {
    grid-template-columns: minmax(0, 1fr);
    padding: 0 16px 28px;
  }

  .neighbor-next {
    text-align: left;
    align-items: flex-start;
  }

  .footer-inner {
    grid-template-columns: minmax(0, 1fr);
    gap: 20px;
    padding: 28px 16px 16px;
  }

  .footer-bottom {
    flex-direction: column;
    gap: 4px;
    padding: 14px 16px 24px;
  }

  .error-main {
    padding-top: 32px;
    padding-bottom: 40px;
  }

  .error-block h1 {
    font-size: 24px;
  }

  .error-actions {
    flex-direction: column;
  }

  .btn-home,
  .btn-rules {
    text-align: center;
  }
}

@media (prefers-reduced-motion: reduce) {
  * {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

/* 程序验收反馈：移动端防溢出 */
@media (max-width: 768px) {
  .site-main,
  .site-main * {
    min-width: 0;
    max-width: 100%;
  }

  .site-main :is(h1, h2, h3, h4, p, a, span) {
    overflow-wrap: anywhere;
  }
}