/* ==========================================================================
   天美在线免费观看 · 全站样式
   分组：base / layout / components / pages / responsive
   ========================================================================== */

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

:root {
  --paper: #f4f1e8;
  --ink: #161d19;
  --deep: #0f3d2e;
  --link: #3f8f5f;
  --amber: #e8a33d;
  --line: #c9c2ae;
  --paper-soft: #faf8f1;
  --paper-warm: #f7edd8;
  --ink-soft: #3d4a43;
  --font-sans: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", "Hiragino Sans GB", system-ui, sans-serif;
  --font-mono: ui-monospace, "SFMono-Regular", "Consolas", "Liberation Mono", monospace;
  --shell-max: 1120px;
  --pad-x: 24px;
  --radius: 6px;
  --header-h: 60px;
}

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

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-h) + 20px);
}

body {
  margin: 0;
  background-color: var(--paper);
  color: var(--ink);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
}

h1,
h2,
h3,
h4 {
  margin: 0;
  color: var(--ink);
  font-weight: 600;
  line-height: 1.35;
}

p {
  margin: 0 0 14px;
}

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

ul,
ol {
  margin: 0;
  padding: 0;
  list-style: none;
}

dl,
dd {
  margin: 0;
}

dt {
  font-weight: 600;
}

a {
  color: var(--link);
  text-decoration: none;
  transition: color 0.18s ease, border-color 0.18s ease, background-color 0.18s ease;
}

a:hover,
a:focus-visible {
  color: var(--deep);
  text-decoration: underline;
  text-underline-offset: 3px;
}

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

figure {
  margin: 0;
}

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

button {
  font-family: inherit;
  font-size: inherit;
  color: inherit;
  cursor: pointer;
}

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

/* 等宽标签与编号的公共字形 */
.eyebrow,
.mono-label,
.mono-tag,
.mono-num,
.step-no,
.genre-no,
.clause-num,
.field-name,
.table-caption,
.mode-label,
.year-tag,
.error-code {
  font-family: var(--font-mono);
  letter-spacing: 0.04em;
}

/* --------------------------------------------------------------------------
   layout · 全站骨架
   -------------------------------------------------------------------------- */

.site-body {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  background-color: var(--paper);
  color: var(--ink);
  font-family: var(--font-sans);
}

/* 页头 */
.site-header {
  position: sticky;
  top: 0;
  z-index: 40;
  background-color: var(--deep);
  border-bottom: 2px solid var(--deep);
}

.header-inner {
  display: flex;
  align-items: center;
  gap: 24px;
  width: 100%;
  max-width: var(--shell-max);
  margin: 0 auto;
  padding: 0 var(--pad-x);
  min-height: var(--header-h);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--paper);
  font-weight: 600;
  font-size: 16px;
  white-space: nowrap;
}

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

.brand-mark {
  display: inline-block;
  width: 18px;
  height: 18px;
  background-color: var(--amber);
  box-shadow: 6px 0 0 0 var(--paper), 0 6px 0 0 var(--paper), 6px 6px 0 0 var(--amber);
  flex: 0 0 auto;
}

.brand-name {
  letter-spacing: 0.02em;
}

/* 主导航 */
.site-nav {
  margin-left: auto;
}

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

.nav-link {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 0 12px;
  color: var(--paper);
  font-size: 15px;
  border-bottom: 2px solid transparent;
}

.nav-link:hover,
.nav-link:focus-visible {
  color: var(--paper);
  background-color: rgba(244, 241, 232, 0.1);
  text-decoration: none;
}

.nav-link.is-current {
  border-bottom-color: var(--amber);
  color: var(--paper);
  font-weight: 600;
}

/* 汉堡按钮：桌面隐藏 */
.nav-toggle {
  display: none;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 5px;
  width: 44px;
  height: 44px;
  margin-left: auto;
  padding: 0;
  background-color: transparent;
  border: 2px solid var(--paper);
  border-radius: 4px;
}

.nav-toggle-bar {
  display: block;
  width: 20px;
  height: 2px;
  background-color: var(--paper);
}

/* 主内容 */
.site-main {
  flex: 1 0 auto;
  width: 100%;
}

.inner-main {
  max-width: var(--shell-max);
  margin: 0 auto;
  padding: 0 var(--pad-x) 64px;
}

/* 面包屑 */
.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  padding: 20px 0 0;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.04em;
  color: var(--ink-soft);
}

.breadcrumb a {
  color: var(--link);
}

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

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

/* 内页标题区 */
.page-header {
  padding: 14px 0 20px;
  border-bottom: 2px solid var(--line);
}

.page-title {
  font-size: clamp(26px, 3.6vw, 38px);
  font-weight: 600;
  color: var(--ink);
  line-height: 1.3;
}

/* 页脚 */
.site-footer {
  margin-top: auto;
  background-color: var(--deep);
  color: var(--paper);
  border-top: 2px solid var(--deep);
}

.footer-inner {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 32px;
  max-width: var(--shell-max);
  margin: 0 auto;
  padding: 44px var(--pad-x) 32px;
}

.footer-title {
  margin-bottom: 14px;
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.06em;
  color: var(--amber);
}

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

.footer-link {
  color: rgba(244, 241, 232, 0.86);
  font-size: 14px;
  line-height: 1.6;
}

.footer-link:hover,
.footer-link:focus-visible {
  color: var(--paper);
  text-decoration: underline;
}

.footer-text {
  font-size: 14px;
  line-height: 1.7;
  color: rgba(244, 241, 232, 0.78);
}

.footer-bottom {
  border-top: 1px solid rgba(244, 241, 232, 0.22);
}

.footer-brand,
.footer-note {
  max-width: var(--shell-max);
  margin: 0 auto;
  padding: 0 var(--pad-x);
  font-size: 13px;
  line-height: 1.7;
  color: rgba(244, 241, 232, 0.7);
}

.footer-brand {
  padding-top: 16px;
  font-family: var(--font-mono);
  letter-spacing: 0.04em;
  color: rgba(244, 241, 232, 0.9);
}

.footer-note {
  padding-bottom: 22px;
}

/* 通用分节标题组 */
.section-head {
  margin-bottom: 24px;
}

.section-head h2 {
  font-size: clamp(20px, 2.4vw, 24px);
  margin-bottom: 8px;
}

.section-head p {
  max-width: 72ch;
  color: var(--ink-soft);
  font-size: 15px;
}

.section-title {
  font-size: clamp(20px, 2.4vw, 24px);
  margin-bottom: 8px;
}

.section-intro,
.section-desc {
  max-width: 72ch;
  margin-bottom: 20px;
  color: var(--ink-soft);
  font-size: 15px;
  line-height: 1.75;
}

/* 页面内两栏工作区：主内容在前，aside 在后 */
.page-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 300px;
  gap: 32px;
  align-items: start;
}

.sidebar-left .page-layout {
  grid-template-columns: 300px minmax(0, 1fr);
}

.sidebar-left .page-layout > :first-child {
  order: 2;
}

.sidebar-left .page-layout > :last-child {
  order: 1;
}

/* 表格横向滚动容器 */
.table-scroll {
  width: 100%;
  overflow-x: auto;
  border: 2px solid var(--line);
  border-radius: var(--radius);
  background-color: var(--paper-soft);
}

/* --------------------------------------------------------------------------
   components · 通用组件
   -------------------------------------------------------------------------- */

/* 按钮 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0 20px;
  border: 2px solid var(--deep);
  border-radius: 4px;
  font-size: 15px;
  font-weight: 600;
  line-height: 1.2;
  text-align: center;
  transition: background-color 0.18s ease, color 0.18s ease, border-color 0.18s ease;
}

.btn-primary {
  background-color: var(--deep);
  color: var(--paper);
}

.btn-primary:hover,
.btn-primary:focus-visible {
  background-color: var(--ink);
  border-color: var(--ink);
  color: var(--paper);
  text-decoration: none;
}

.btn-ghost {
  background-color: transparent;
  color: var(--deep);
}

.btn-ghost:hover,
.btn-ghost:focus-visible {
  background-color: var(--paper-warm);
  color: var(--deep);
  text-decoration: none;
}

/* 等宽小标签块 */
.eyebrow,
.mono-label,
.mono-tag {
  display: inline-block;
  padding: 3px 9px;
  background-color: var(--paper-warm);
  border: 2px solid var(--line);
  border-radius: 3px;
  color: var(--deep);
  font-size: 12px;
  line-height: 1.5;
  text-transform: uppercase;
}

.mono-label {
  padding: 1px 7px;
  font-size: 11.5px;
  background-color: transparent;
  border-color: var(--line);
  color: var(--ink-soft);
}

/* 索引表 */
.index-table {
  width: 100%;
  min-width: 640px;
  border-collapse: collapse;
  font-size: 14px;
  line-height: 1.6;
}

.table-caption {
  padding: 10px 14px;
  text-align: left;
  font-size: 12px;
  color: var(--ink-soft);
  background-color: var(--paper-warm);
  border-bottom: 2px solid var(--line);
}

.index-table thead th {
  padding: 11px 14px;
  background-color: var(--deep);
  color: var(--paper);
  font-family: var(--font-mono);
  font-size: 12.5px;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-align: left;
  white-space: nowrap;
  border-right: 1px solid rgba(244, 241, 232, 0.2);
}

.index-table thead th:last-child {
  border-right: none;
}

.index-table tbody th,
.index-table tbody td {
  padding: 12px 14px;
  text-align: left;
  vertical-align: top;
  border-top: 1px solid var(--line);
  border-right: 1px solid var(--line);
}

.index-table tbody tr:first-child th,
.index-table tbody tr:first-child td {
  border-top: none;
}

.index-table tbody th:last-child,
.index-table tbody td:last-child {
  border-right: none;
}

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

.index-table tbody tr:hover {
  background-color: var(--paper-warm);
}

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

/* 数据表（浏览步骤结果解读） */
.data-table {
  width: 100%;
  min-width: 600px;
  border-collapse: collapse;
  font-size: 14px;
  line-height: 1.65;
}

.data-table thead th {
  padding: 11px 14px;
  background-color: var(--deep);
  color: var(--paper);
  font-family: var(--font-mono);
  font-size: 12.5px;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-align: left;
  border-right: 1px solid rgba(244, 241, 232, 0.2);
}

.data-table thead th:last-child {
  border-right: none;
}

.data-table tbody th,
.data-table tbody td {
  padding: 12px 14px;
  text-align: left;
  vertical-align: top;
  border-top: 1px solid var(--line);
  border-right: 1px solid var(--line);
}

.data-table tbody tr:first-child th,
.data-table tbody tr:first-child td {
  border-top: none;
}

.data-table tbody th:last-child,
.data-table tbody td:last-child {
  border-right: none;
}

.data-table tbody th {
  color: var(--deep);
  font-weight: 600;
}

.data-table tbody tr:hover {
  background-color: var(--paper-warm);
}

/* 字段说明列表（首页侧栏 / 频道索引侧栏） */
.field-list {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.field-item {
  padding: 12px 0;
  border-bottom: 1px dashed var(--line);
}

.field-item:first-child {
  padding-top: 0;
}

.field-item:last-child {
  border-bottom: none;
}

.field-name {
  display: inline-block;
  margin-bottom: 4px;
  font-size: 12.5px;
  letter-spacing: 0.04em;
  color: var(--deep);
  font-weight: 600;
}

.field-item p,
.field-desc {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--ink-soft);
}

/* 可展开问答 */
.faq-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.faq-item {
  border: 2px solid var(--line);
  border-radius: var(--radius);
  background-color: var(--paper-soft);
  overflow: hidden;
}

.faq-item[open] {
  border-color: var(--deep);
}

.faq-question {
  margin: 0;
  font-size: 16px;
  font-weight: 600;
}

.faq-toggle {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  width: 100%;
  min-height: 52px;
  padding: 12px 16px;
  background-color: transparent;
  border: none;
  text-align: left;
  font-weight: 600;
  color: var(--ink);
}

.faq-toggle:hover {
  background-color: var(--paper-warm);
}

.faq-state {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--deep);
  border: 2px solid var(--line);
  border-radius: 3px;
  padding: 1px 8px;
}

.faq-answer {
  padding: 0 16px 16px;
  border-top: 1px solid var(--line);
  padding-top: 12px;
  font-size: 15px;
  line-height: 1.75;
  color: var(--ink-soft);
}

.faq-answer p {
  margin: 0;
}

/* 相关入口带 */
.related-band {
  margin-top: 56px;
  padding: 24px;
  background-color: var(--paper-soft);
  border: 2px solid var(--line);
  border-radius: var(--radius);
}

.related-title {
  font-size: 18px;
  margin-bottom: 8px;
}

.related-text {
  max-width: 72ch;
  margin-bottom: 16px;
  color: var(--ink-soft);
  font-size: 15px;
}

.related-links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.related-link {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 0 16px;
  border: 2px solid var(--deep);
  border-radius: 4px;
  color: var(--deep);
  font-size: 14px;
  font-weight: 600;
  background-color: transparent;
}

.related-link:hover,
.related-link:focus-visible {
  background-color: var(--deep);
  color: var(--paper);
  text-decoration: none;
}

/* 图片容器基础约束 */
.hero-media img,
.genre-media img,
.featured-media img,
.featured-figure img,
.board-figure img,
.archive-figure img,
.step-figure img,
.suspect-figure img,
.format-figure img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: 4px;
}

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

.home-main {
  display: block;
}

/* 首屏 */
.hero {
  border-bottom: 2px solid var(--line);
  background-color: var(--paper);
}

.hero-inner {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(0, 1fr);
  gap: 40px;
  align-items: center;
  max-width: var(--shell-max);
  margin: 0 auto;
  padding: 56px var(--pad-x) 40px;
}

.hero-text {
  min-width: 0;
}

.hero-text .eyebrow {
  margin-bottom: 16px;
}

.hero-text h1 {
  font-size: clamp(28px, 4.2vw, 44px);
  line-height: 1.25;
  margin-bottom: 18px;
}

.hero-lead {
  max-width: 40ch;
  margin-bottom: 24px;
  font-size: 16px;
  line-height: 1.78;
  color: var(--ink-soft);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.hero-media {
  position: relative;
  border: 2px solid var(--deep);
  border-radius: var(--radius);
  background-color: var(--paper-soft);
  overflow: hidden;
  aspect-ratio: 4 / 3;
}

.hero-media img {
  position: absolute;
  inset: 0;
  height: 100%;
}

.hero-media figcaption {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  padding: 8px 12px;
  background-color: rgba(15, 61, 46, 0.82);
  color: var(--paper);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
}

/* 三种浏览方式标签 */
.hero-modes {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px 20px;
  max-width: var(--shell-max);
  margin: 0 auto;
  padding: 0 var(--pad-x) 40px;
}

.mode-label {
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--ink-soft);
}

.mode-list {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.mode-tag {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 0 16px;
  border: 2px solid var(--line);
  border-radius: 999px;
  background-color: var(--paper-soft);
  color: var(--deep);
  font-size: 14px;
}

.mode-tag:hover,
.mode-tag:focus-visible {
  border-color: var(--deep);
  background-color: var(--paper-warm);
  text-decoration: none;
}

/* 索引工作区 */
.workbench {
  max-width: var(--shell-max);
  margin: 0 auto;
  padding: 56px var(--pad-x);
  border-bottom: 2px solid var(--line);
}

.workbench-layout {
  grid-template-columns: minmax(0, 1fr) 300px;
}

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

.workbench-note {
  margin-top: 14px;
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--ink-soft);
}

.workbench-aside {
  padding: 20px;
  background-color: var(--paper-soft);
  border: 2px solid var(--line);
  border-radius: var(--radius);
}

.aside-title {
  font-size: 17px;
  margin-bottom: 14px;
  padding-bottom: 10px;
  border-bottom: 2px solid var(--line);
}

.aside-link {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  margin-top: 14px;
  font-size: 14px;
  font-weight: 600;
  color: var(--deep);
}

.aside-link:hover,
.aside-link:focus-visible {
  text-decoration: underline;
}

/* 题材分组 */
.genre-section {
  max-width: var(--shell-max);
  margin: 0 auto;
  padding: 56px var(--pad-x);
  border-bottom: 2px solid var(--line);
}

.genre-list {
  display: flex;
  flex-direction: column;
  gap: 0;
  border-top: 2px solid var(--line);
}

.genre-item {
  display: grid;
  grid-template-columns: 56px minmax(0, 1fr) auto;
  gap: 20px;
  align-items: start;
  padding: 20px 12px;
  border-bottom: 1px solid var(--line);
  transition: background-color 0.18s ease, box-shadow 0.18s ease;
}

.genre-item:hover {
  background-color: var(--paper-warm);
  box-shadow: inset 2px 0 0 0 var(--deep);
}

.genre-no {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  font-size: 13px;
  font-weight: 600;
  color: var(--deep);
  background-color: var(--paper-warm);
  border: 2px solid var(--line);
  border-radius: 3px;
}

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

.genre-name {
  font-size: 17px;
  margin-bottom: 6px;
}

.genre-body p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.72;
  color: var(--ink-soft);
}

.genre-link {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 0 14px;
  border: 2px solid var(--deep);
  border-radius: 4px;
  font-size: 13.5px;
  font-weight: 600;
  color: var(--deep);
  white-space: nowrap;
}

.genre-link:hover,
.genre-link:focus-visible {
  background-color: var(--deep);
  color: var(--paper);
  text-decoration: none;
}

/* 第 3 条题材带插图 */
.genre-item-with-media {
  grid-template-columns: 56px 200px minmax(0, 1fr) auto;
  align-items: center;
}

.genre-media {
  border: 2px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  aspect-ratio: 4 / 3;
  background-color: var(--paper-warm);
}

/* 专题档案带 */
.featured-section {
  max-width: var(--shell-max);
  margin: 0 auto;
  padding: 56px var(--pad-x);
  border-bottom: 2px solid var(--line);
}

.featured-list {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 20px;
}

.featured-item {
  display: flex;
  flex-direction: column;
  background-color: var(--paper-soft);
  border: 2px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  transition: border-color 0.18s ease, box-shadow 0.18s ease;
}

.featured-item:hover {
  border-color: var(--deep);
  box-shadow: 0 2px 0 0 var(--deep);
}

.featured-media {
  aspect-ratio: 16 / 10;
  background-color: var(--paper-warm);
  border-bottom: 2px solid var(--line);
}

.featured-body {
  padding: 16px 18px 18px;
  min-width: 0;
}

.featured-name {
  font-size: 17px;
  margin-bottom: 10px;
}

.featured-meta {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 4px 12px;
  margin-bottom: 12px;
  font-size: 13px;
  line-height: 1.6;
}

.featured-meta dt {
  font-family: var(--font-mono);
  letter-spacing: 0.04em;
  color: var(--ink-soft);
  font-weight: 400;
}

.featured-meta dd {
  color: var(--deep);
  font-weight: 600;
  min-width: 0;
}

.featured-body > p {
  font-size: 14px;
  line-height: 1.72;
  color: var(--ink-soft);
}

/* 浏览步骤预览 */
.steps-preview {
  max-width: var(--shell-max);
  margin: 0 auto;
  padding: 56px var(--pad-x);
  border-bottom: 2px solid var(--line);
}

.step-list {
  display: flex;
  flex-direction: column;
  gap: 0;
  margin-bottom: 20px;
  border-top: 2px solid var(--line);
}

.step-item {
  display: grid;
  grid-template-columns: 56px minmax(0, 1fr);
  gap: 20px;
  align-items: start;
  padding: 18px 12px;
  border-bottom: 1px solid var(--line);
}

.step-item:hover {
  background-color: var(--paper-warm);
  box-shadow: inset 2px 0 0 0 var(--deep);
}

.step-no {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  font-size: 13px;
  font-weight: 600;
  color: var(--paper);
  background-color: var(--deep);
  border-radius: 3px;
}

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

.step-title {
  font-size: 16.5px;
  margin-bottom: 4px;
}

.step-body p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.72;
  color: var(--ink-soft);
}

.steps-link {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  font-size: 14px;
  font-weight: 600;
  color: var(--deep);
}

.steps-link:hover,
.steps-link:focus-visible {
  text-decoration: underline;
}

/* 使用边界摘要 */
.limits-summary {
  max-width: var(--shell-max);
  margin: 0 auto;
  padding: 56px var(--pad-x);
  border-bottom: 2px solid var(--line);
}

.limits-columns {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20px;
  margin-bottom: 18px;
}

.limits-policy,
.limits-audience {
  padding: 20px;
  background-color: var(--paper-soft);
  border: 2px solid var(--line);
  border-radius: var(--radius);
  min-width: 0;
}

.limits-subtitle {
  font-size: 16px;
  margin-bottom: 12px;
  padding-bottom: 8px;
  border-bottom: 2px solid var(--line);
}

.policy-list,
.audience-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.policy-list li,
.audience-list li {
  position: relative;
  padding-left: 20px;
  font-size: 14.5px;
  line-height: 1.72;
  color: var(--ink-soft);
}

.policy-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.62em;
  width: 8px;
  height: 8px;
  background-color: var(--amber);
}

.audience-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.62em;
  width: 8px;
  height: 8px;
  border: 2px solid var(--deep);
  border-radius: 50%;
}

.limits-link {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  font-size: 14px;
  font-weight: 600;
  color: var(--deep);
}

.limits-link:hover,
.limits-link:focus-visible {
  text-decoration: underline;
}

/* 常见问题 */
.faq-section {
  max-width: var(--shell-max);
  margin: 0 auto;
  padding: 56px var(--pad-x);
  border-bottom: 2px solid var(--line);
}

/* 反馈入口带 */
.feedback-band {
  max-width: var(--shell-max);
  margin: 0 auto;
  padding: 56px var(--pad-x);
}

.feedback-inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 24px;
  align-items: center;
  padding: 28px;
  background-color: var(--paper-soft);
  border: 2px solid var(--deep);
  border-radius: var(--radius);
}

.feedback-inner h2 {
  font-size: 20px;
  margin-bottom: 8px;
}

.feedback-inner p {
  max-width: 60ch;
  font-size: 15px;
  line-height: 1.75;
  color: var(--ink-soft);
}

.feedback-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0 20px;
  background-color: var(--deep);
  color: var(--paper);
  border: 2px solid var(--deep);
  border-radius: 4px;
  font-size: 15px;
  font-weight: 600;
  white-space: nowrap;
}

.feedback-link:hover,
.feedback-link:focus-visible {
  background-color: var(--ink);
  border-color: var(--ink);
  color: var(--paper);
  text-decoration: none;
}

/* --------------------------------------------------------------------------
   pages · 频道索引
   -------------------------------------------------------------------------- */

.page-channel-index .page-head {
  padding: 20px 0 24px;
}

.page-channel-index .page-head .eyebrow {
  margin-bottom: 10px;
}

.page-head .page-lead {
  max-width: 72ch;
  font-size: 15.5px;
  line-height: 1.78;
  color: var(--ink-soft);
}

.page-channel-index .layout-shell {
  grid-template-columns: minmax(0, 1fr) 320px;
  gap: 32px;
}

.index-board {
  min-width: 0;
}

.index-board .section-title {
  margin-bottom: 6px;
}

.index-board .section-intro {
  margin-bottom: 16px;
}

.board-figure {
  margin-top: 20px;
  border: 2px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  background-color: var(--paper-soft);
}

.board-figure img {
  aspect-ratio: 16 / 9;
  height: auto;
}

.board-figure figcaption {
  padding: 10px 14px;
  border-top: 2px solid var(--line);
  font-size: 13px;
}

/* 粘性字段说明栏 */
.field-panel {
  position: sticky;
  top: calc(var(--header-h) + 16px);
  padding: 20px;
  background-color: var(--paper-soft);
  border: 2px solid var(--line);
  border-radius: var(--radius);
  min-width: 0;
}

.field-panel .section-title {
  font-size: 17px;
  margin-bottom: 6px;
}

.field-panel .section-intro {
  margin-bottom: 12px;
  font-size: 14px;
}

.field-panel .field-list {
  margin: 0;
}

.field-panel .field-item {
  padding: 12px 0;
}

.field-panel .field-item:first-child {
  padding-top: 0;
}

/* 题材归属分组 */
.page-channel-index .genre-section {
  max-width: none;
  margin: 0;
  padding: 48px 0 0;
  border-bottom: none;
}

.page-channel-index .genre-list {
  border-top: 2px solid var(--line);
}

.page-channel-index .genre-item {
  grid-template-columns: 56px minmax(0, 1fr) auto;
}

.genre-meta {
  margin: 0 0 4px;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.04em;
  color: var(--deep);
}

.genre-desc {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.72;
  color: var(--ink-soft);
}

/* --------------------------------------------------------------------------
   pages · 专题档案
   -------------------------------------------------------------------------- */

.page-topic-archive .page-container,
.page-feedback .page-container,
.page-browse-steps .page-container {
  width: 100%;
}

.page-topic-archive .page-head {
  padding: 20px 0 24px;
}

.page-topic-archive .page-head .mono-label {
  margin-bottom: 12px;
}

.year-axis {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 18px;
  padding-top: 18px;
  border-top: 2px solid var(--line);
}

.year-tag {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 0 16px;
  border: 2px solid var(--line);
  border-radius: 4px;
  background-color: var(--paper-soft);
  color: var(--deep);
  font-size: 13px;
  font-weight: 600;
}

.year-tag:hover,
.year-tag:focus-visible {
  background-color: var(--amber);
  border-color: var(--amber);
  color: var(--ink);
  text-decoration: none;
}

.archive-years {
  padding: 48px 0 0;
}

.year-group {
  margin-bottom: 28px;
  padding: 20px;
  background-color: var(--paper-soft);
  border: 2px solid var(--line);
  border-radius: var(--radius);
}

.year-group-title {
  font-size: 18px;
  margin-bottom: 14px;
  padding-bottom: 10px;
  border-bottom: 2px solid var(--line);
}

.year-group-title .mono-label {
  margin-left: 8px;
  vertical-align: middle;
}

.year-entries {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.year-entry {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(0, 1fr) minmax(0, 1.4fr);
  gap: 16px;
  align-items: start;
  padding: 12px 0;
  border-bottom: 1px dashed var(--line);
}

.year-entry:last-child {
  border-bottom: none;
  padding-bottom: 0;
}

.entry-name {
  margin: 0;
  font-size: 15px;
  font-weight: 600;
  color: var(--ink);
}

.entry-theme {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.04em;
  color: var(--deep);
}

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

.archive-figure {
  margin-top: 8px;
  border: 2px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  background-color: var(--paper-soft);
}

.archive-figure img {
  aspect-ratio: 16 / 9;
  height: auto;
}

.figure-caption {
  padding: 10px 14px;
  border-top: 2px solid var(--line);
  font-size: 13px;
}

/* 题材分组片单 */
.genre-groups {
  padding: 48px 0 0;
}

.genre-groups .genre-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 16px;
  border-top: none;
}

.genre-groups .genre-item {
  display: block;
  padding: 18px;
  background-color: var(--paper-soft);
  border: 2px solid var(--line);
  border-radius: var(--radius);
  box-shadow: none;
}

.genre-groups .genre-item:hover {
  border-color: var(--deep);
  background-color: var(--paper-warm);
  box-shadow: none;
}

.genre-groups .genre-name {
  font-size: 16.5px;
  margin-bottom: 6px;
}

.genre-range {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.04em;
  color: var(--deep);
}

.genre-note {
  margin: 0;
  font-size: 14px;
  line-height: 1.72;
  color: var(--ink-soft);
}

/* 代表专题档案 */
.featured-topics {
  padding: 48px 0 0;
}

.featured-topics .featured-item {
  display: grid;
  grid-template-columns: 280px minmax(0, 1fr);
  gap: 0;
  margin-bottom: 20px;
  background-color: var(--paper-soft);
  border: 2px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}

.featured-topics .featured-item-reverse {
  grid-template-columns: minmax(0, 1fr) 280px;
}

.featured-topics .featured-item-reverse .featured-figure {
  order: 2;
  border-left: 2px solid var(--line);
  border-right: none;
}

.featured-topics .featured-item-reverse .featured-body {
  order: 1;
}

.featured-figure {
  min-width: 0;
  background-color: var(--paper-warm);
  border-right: 2px solid var(--line);
}

.featured-figure img {
  aspect-ratio: 4 / 3;
  height: 100%;
}

.featured-topics .featured-body {
  padding: 22px 24px;
}

.featured-title {
  font-size: 18px;
  margin-bottom: 12px;
}

.featured-topics .featured-meta {
  grid-template-columns: auto minmax(0, 1fr);
  gap: 6px 14px;
  font-size: 13.5px;
}

/* --------------------------------------------------------------------------
   pages · 浏览步骤
   -------------------------------------------------------------------------- */

.page-browse-steps .page-title-block {
  padding: 20px 0 24px;
}

.page-browse-steps .page-title-block .mono-tag {
  margin-bottom: 12px;
}

.section {
  padding: 8px 0 0;
}

.page-browse-steps .section-head {
  margin-bottom: 22px;
}

/* 步骤锚点条 */
.step-anchor {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 18px;
  padding-top: 18px;
  border-top: 2px solid var(--line);
}

.step-anchor-item {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 0 16px;
  border: 2px solid var(--line);
  border-radius: 4px;
  background-color: var(--paper-soft);
  color: var(--deep);
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.04em;
  font-weight: 600;
}

.step-anchor-item:hover,
.step-anchor-item:focus-visible,
.step-anchor-item.is-active {
  background-color: var(--amber);
  border-color: var(--amber);
  color: var(--ink);
  text-decoration: none;
}

/* 四步流程 */
.steps-list {
  display: flex;
  flex-direction: column;
  gap: 0;
  border-top: 2px solid var(--line);
}

.step-block {
  padding: 24px 0;
  border-bottom: 2px solid var(--line);
}

.step-block-head {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 12px;
}

.mono-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 42px;
  height: 42px;
  padding: 0 8px;
  font-size: 14px;
  font-weight: 600;
  color: var(--paper);
  background-color: var(--deep);
  border-radius: 4px;
}

.step-block .step-title {
  font-size: 19px;
}

.step-action,
.step-check,
.step-fix {
  max-width: 72ch;
  font-size: 15px;
  line-height: 1.78;
  color: var(--ink-soft);
}

.step-action {
  margin-bottom: 12px;
}

.step-check,
.step-fix {
  padding: 10px 14px;
  background-color: var(--paper-soft);
  border-left: 2px solid var(--line);
  border-radius: 0 4px 4px 0;
}

.step-check {
  margin-bottom: 10px;
}

.step-check .mono-label,
.step-fix .mono-label {
  margin-right: 8px;
}

.step-fix .mono-label {
  border-color: var(--amber);
  color: var(--ink);
}

/* 步骤配图 */
.step-media-section {
  padding-top: 40px;
}

.step-figure {
  border: 2px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  background-color: var(--paper-soft);
}

.step-figure img {
  aspect-ratio: 16 / 9;
  height: auto;
}

.step-figure figcaption {
  padding: 10px 14px;
  border-top: 2px solid var(--line);
  font-size: 13px;
}

/* 结果解读 */
.result-section {
  padding-top: 40px;
}

.result-table thead th {
  white-space: nowrap;
}

/* 常见卡点 */
.stuck-section {
  padding-top: 40px;
}

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

.stuck-item {
  padding: 18px;
  background-color: var(--paper-soft);
  border: 2px solid var(--line);
  border-radius: var(--radius);
  min-width: 0;
}

.stuck-name {
  font-size: 16px;
  margin-bottom: 8px;
}

.stuck-fix {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.72;
  color: var(--ink-soft);
}

.stuck-note {
  margin-top: 18px;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--ink-soft);
}

/* 相关入口（浏览步骤页内层结构） */
.related-inner {
  min-width: 0;
}

/* --------------------------------------------------------------------------
   pages · 使用边界
   -------------------------------------------------------------------------- */

.page-limits .page-hero {
  padding: 20px 0 24px;
}

.page-limits .page-hero .mono-tag {
  margin-bottom: 12px;
}

.page-limits .page-lead {
  max-width: 72ch;
  font-size: 15.5px;
  line-height: 1.78;
  color: var(--ink-soft);
}

.boundary-summary {
  padding: 8px 0 0;
}

.summary-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20px;
}

.summary-card {
  padding: 22px;
  background-color: var(--paper-soft);
  border: 2px solid var(--line);
  border-radius: var(--radius);
  min-width: 0;
}

.summary-card-policy {
  border-left: 4px solid var(--deep);
}

.summary-card-audience {
  border-left: 4px solid var(--amber);
}

.summary-card-title {
  font-size: 17px;
  margin-bottom: 14px;
  padding-bottom: 10px;
  border-bottom: 2px solid var(--line);
}

.summary-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.summary-list li {
  position: relative;
  padding-left: 20px;
  font-size: 14.5px;
  line-height: 1.72;
  color: var(--ink-soft);
}

.summary-card-policy .summary-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.62em;
  width: 8px;
  height: 8px;
  background-color: var(--deep);
}

.summary-card-audience .summary-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.62em;
  width: 8px;
  height: 8px;
  background-color: var(--amber);
}

.summary-note {
  margin-top: 14px;
  padding-top: 12px;
  border-top: 1px dashed var(--line);
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--ink-soft);
}

/* 正文条款 */
.clause-section {
  padding-top: 48px;
}

.clause-columns {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 24px;
  align-items: start;
}

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

.clause-item {
  padding: 18px;
  background-color: var(--paper-soft);
  border: 2px solid var(--line);
  border-radius: var(--radius);
}

.clause-num {
  display: inline-block;
  margin-bottom: 6px;
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--deep);
  font-weight: 600;
}

.clause-title {
  font-size: 16px;
  margin-bottom: 8px;
}

.clause-text {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--ink-soft);
}

/* 可疑说法判断 */
.suspect-section {
  padding-top: 48px;
}

.suspect-figure {
  margin-bottom: 22px;
  border: 2px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  background-color: var(--paper-soft);
}

.suspect-figure img {
  aspect-ratio: 16 / 9;
  height: auto;
}

.suspect-caption {
  padding: 10px 14px;
  border-top: 2px solid var(--line);
  font-size: 13px;
}

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

.suspect-item {
  padding: 18px;
  background-color: var(--paper-soft);
  border: 2px solid var(--line);
  border-radius: var(--radius);
  min-width: 0;
}

.suspect-title {
  font-size: 16px;
  margin-bottom: 8px;
}

.suspect-text {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--ink-soft);
}

/* --------------------------------------------------------------------------
   pages · 反馈说明
   -------------------------------------------------------------------------- */

.page-feedback .page-head {
  padding: 20px 0 24px;
}

.page-feedback .page-head .mono-label {
  margin-bottom: 12px;
}

.feedback-scope {
  padding: 8px 0 0;
}

.scope-columns {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20px;
}

.scope-box {
  padding: 20px;
  background-color: var(--paper-soft);
  border: 2px solid var(--line);
  border-radius: var(--radius);
  min-width: 0;
}

.scope-box--accept {
  border-left: 4px solid var(--deep);
}

.scope-box--reject {
  border-left: 4px solid var(--amber);
}

.box-title {
  font-size: 16.5px;
  margin-bottom: 12px;
  padding-bottom: 8px;
  border-bottom: 2px solid var(--line);
}

.scope-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.scope-list li {
  position: relative;
  padding-left: 20px;
  font-size: 14.5px;
  line-height: 1.72;
  color: var(--ink-soft);
}

.scope-box--accept .scope-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.62em;
  width: 8px;
  height: 8px;
  background-color: var(--deep);
}

.scope-box--reject .scope-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.62em;
  width: 8px;
  height: 8px;
  border: 2px solid var(--amber);
  border-radius: 50%;
}

/* 整理格式 */
.feedback-format {
  padding-top: 48px;
}

.format-figure {
  margin-bottom: 22px;
  border: 2px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  background-color: var(--paper-soft);
}

.format-figure img {
  aspect-ratio: 16 / 9;
  height: auto;
}

.format-figure figcaption {
  padding: 10px 14px;
  border-top: 2px solid var(--line);
  font-size: 13px;
}

.format-steps {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
  margin-bottom: 22px;
}

.format-step {
  padding: 18px;
  background-color: var(--paper-soft);
  border: 2px solid var(--line);
  border-radius: var(--radius);
  min-width: 0;
}

.format-step .mono-label {
  margin-bottom: 8px;
}

.format-step .step-title {
  font-size: 16px;
  margin-bottom: 8px;
}

.step-text {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.72;
  color: var(--ink-soft);
}

.format-example {
  padding: 20px;
  background-color: var(--paper-warm);
  border: 2px solid var(--line);
  border-radius: var(--radius);
}

.example-text {
  margin: 0;
  max-width: 72ch;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--ink-soft);
}

/* 反馈说明的问答使用 details */
.feedback-faq {
  padding-top: 48px;
}

.feedback-faq .faq-item {
  background-color: var(--paper-soft);
}

.feedback-faq .faq-question {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  min-height: 52px;
  padding: 12px 16px;
  cursor: pointer;
  list-style: none;
  font-size: 16px;
}

.feedback-faq .faq-question::-webkit-details-marker {
  display: none;
}

.feedback-faq .faq-question::after {
  content: "展开";
  flex: 0 0 auto;
  padding: 1px 8px;
  border: 2px solid var(--line);
  border-radius: 3px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  font-weight: 400;
  color: var(--deep);
}

.feedback-faq .faq-item[open] .faq-question::after {
  content: "收起";
  border-color: var(--deep);
}

.feedback-faq .faq-question:hover {
  background-color: var(--paper-warm);
}

.feedback-faq .faq-answer {
  padding: 12px 16px 16px;
  border-top: 1px solid var(--line);
  font-size: 15px;
  line-height: 1.75;
  color: var(--ink-soft);
}

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

.error-main {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 72px var(--pad-x);
}

.error-panel {
  width: 100%;
  max-width: 640px;
  padding: 36px 32px;
  background-color: var(--paper-soft);
  border: 2px solid var(--deep);
  border-radius: var(--radius);
  text-align: left;
}

.error-code {
  font-size: 13px;
  letter-spacing: 0.1em;
  color: var(--deep);
  margin-bottom: 10px;
}

.error-title {
  font-size: clamp(24px, 3.4vw, 34px);
  margin-bottom: 14px;
}

.error-lead {
  font-size: 15.5px;
  line-height: 1.78;
  color: var(--ink-soft);
  margin-bottom: 18px;
}

.error-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-bottom: 24px;
  padding-top: 16px;
  border-top: 2px solid var(--line);
}

.error-list li {
  position: relative;
  padding-left: 20px;
  font-size: 14.5px;
  line-height: 1.72;
  color: var(--ink-soft);
}

.error-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.62em;
  width: 8px;
  height: 8px;
  background-color: var(--amber);
}

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

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

@media (max-width: 960px) {
  :root {
    --pad-x: 20px;
  }

  /* 导航折叠为汉堡菜单 */
  .nav-toggle {
    display: inline-flex;
  }

  .site-nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    margin-left: 0;
    background-color: var(--deep);
    border-bottom: 2px solid var(--amber);
    box-shadow: 0 8px 0 rgba(22, 29, 25, 0.12);
  }

  .nav-list {
    display: none;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 8px var(--pad-x) 12px;
  }

  .nav-list.is-open {
    display: flex;
  }

  .nav-link {
    width: 100%;
    min-height: 48px;
    padding: 0 4px;
    border-bottom: 1px solid rgba(244, 241, 232, 0.18);
    border-radius: 0;
  }

  .nav-link.is-current {
    border-bottom-color: var(--amber);
    background-color: rgba(244, 241, 232, 0.08);
  }

  .header-inner {
    position: relative;
  }

  /* 首屏改为上下结构 */
  .hero-inner {
    grid-template-columns: minmax(0, 1fr);
    gap: 28px;
    padding-top: 36px;
    padding-bottom: 32px;
  }

  .hero-lead {
    max-width: 60ch;
  }

  .hero-media {
    aspect-ratio: 16 / 10;
  }

  /* 首页工作区与内页工作区改为单列 */
  .page-layout,
  .page-channel-index .layout-shell,
  .workbench-layout {
    grid-template-columns: minmax(0, 1fr);
    gap: 24px;
  }

  .field-panel {
    position: static;
  }

  /* 题材条目：图片行内换位 */
  .genre-item-with-media {
    grid-template-columns: 56px minmax(0, 1fr) auto;
  }

  .genre-item-with-media .genre-media {
    grid-column: 2 / 3;
    grid-row: 1;
    margin-bottom: 12px;
  }

  .genre-item-with-media .genre-body {
    grid-column: 2 / 3;
    grid-row: 2;
  }

  .genre-item-with-media .genre-link {
    grid-column: 3 / 4;
    grid-row: 1 / 3;
    align-self: center;
  }

  /* 专题条目 */
  .featured-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .featured-topics .featured-item,
  .featured-topics .featured-item-reverse {
    grid-template-columns: minmax(0, 1fr);
  }

  .featured-topics .featured-item-reverse .featured-figure {
    order: 1;
    border-left: none;
    border-right: none;
    border-bottom: 2px solid var(--line);
  }

  .featured-topics .featured-item-reverse .featured-body {
    order: 2;
  }

  .featured-figure {
    border-right: none;
    border-bottom: 2px solid var(--line);
  }

  .featured-figure img {
    aspect-ratio: 16 / 9;
    height: auto;
  }

  /* 年份条目：主题与说明换行 */
  .year-entry {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    gap: 6px 16px;
  }

  .entry-note {
    grid-column: 1 / -1;
  }

  /* 步骤 */
  .stuck-list {
    grid-template-columns: minmax(0, 1fr);
  }

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

  .feedback-inner {
    grid-template-columns: minmax(0, 1fr);
    align-items: start;
  }

  .feedback-link {
    justify-self: start;
  }

  /* 边界与反馈两列改上下 */
  .limits-columns,
  .summary-grid,
  .scope-columns,
  .clause-columns,
  .suspect-list {
    grid-template-columns: minmax(0, 1fr);
  }

  .footer-inner {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 28px;
  }
}

@media (max-width: 640px) {
  :root {
    --pad-x: 16px;
    --header-h: 56px;
  }

  body {
    font-size: 15.5px;
  }

  .header-inner {
    gap: 12px;
  }

  .brand {
    font-size: 15px;
  }

  .brand-name {
    white-space: normal;
    line-height: 1.2;
  }

  .hero-inner {
    padding-top: 28px;
    padding-bottom: 26px;
  }

  .hero-actions .btn {
    flex: 1 1 100%;
  }

  .hero-modes {
    padding-bottom: 32px;
  }

  .mode-list {
    width: 100%;
  }

  .mode-tag {
    flex: 1 1 auto;
    justify-content: center;
  }

  .workbench,
  .genre-section,
  .featured-section,
  .steps-preview,
  .limits-summary,
  .faq-section,
  .feedback-band {
    padding: 40px var(--pad-x);
  }

  .inner-main {
    padding-bottom: 48px;
  }

  /* 题材条目改为纵向 */
  .genre-item,
  .page-channel-index .genre-item {
    grid-template-columns: 40px minmax(0, 1fr);
    gap: 12px;
    padding: 16px 8px;
  }

  .genre-no {
    width: 32px;
    height: 32px;
    font-size: 12px;
  }

  .genre-link {
    grid-column: 2 / 3;
    justify-self: start;
    margin-top: 4px;
  }

  .genre-item-with-media {
    grid-template-columns: 40px minmax(0, 1fr);
  }

  .genre-item-with-media .genre-media {
    grid-column: 2 / 3;
    grid-row: 1;
    margin-bottom: 10px;
  }

  .genre-item-with-media .genre-body {
    grid-column: 2 / 3;
    grid-row: 2;
  }

  .genre-item-with-media .genre-link {
    grid-column: 2 / 3;
    grid-row: 3;
    align-self: start;
  }

  /* 专题卡片单列 */
  .featured-list {
    grid-template-columns: minmax(0, 1fr);
  }

  .step-item {
    grid-template-columns: 40px minmax(0, 1fr);
    gap: 12px;
    padding: 16px 8px;
  }

  .step-no {
    width: 32px;
    height: 32px;
    font-size: 12px;
  }

  .step-block-head {
    gap: 10px;
  }

  .mono-num {
    min-width: 36px;
    height: 36px;
    font-size: 13px;
  }

  .step-block .step-title {
    font-size: 17px;
  }

  .step-check,
  .step-fix {
    padding: 10px 12px;
  }

  .step-check .mono-label,
  .step-fix .mono-label {
    display: inline-block;
    margin-bottom: 4px;
    margin-right: 0;
  }

  /* 年份条目单列 */
  .year-entry {
    grid-template-columns: minmax(0, 1fr);
    gap: 4px;
  }

  .entry-note {
    grid-column: auto;
  }

  .year-group {
    padding: 16px;
  }

  /* 反馈入口 */
  .feedback-inner {
    padding: 20px;
  }

  .feedback-link {
    width: 100%;
  }

  /* 页脚单列 */
  .footer-inner {
    grid-template-columns: minmax(0, 1fr);
    gap: 24px;
    padding-top: 36px;
  }

  .error-panel {
    padding: 28px 20px;
  }

  .error-actions .btn {
    flex: 1 1 100%;
  }

  /* 表格保持横向滚动可读 */
  .index-table {
    min-width: 620px;
  }

  .data-table {
    min-width: 560px;
  }

  .related-band {
    padding: 20px;
  }

  .related-links .related-link {
    flex: 1 1 100%;
    justify-content: center;
  }

  .board-figure img,
  .archive-figure img,
  .step-figure img,
  .suspect-figure img,
  .format-figure img {
    aspect-ratio: 4 / 3;
  }
}

/* 尊重减少动效偏好 */
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
  }
}