/* ==========================================================================
   秋霞在线视频 · 全站样式表
   分组：base / layout / components / pages / responsive
   ========================================================================== */

/* --------------------------------------------------------------------------
   1. base —— 变量、重置、基础排版
   -------------------------------------------------------------------------- */
:root {
  --color-primary: #2f4f8f;
  --color-primary-dark: #253d70;
  --color-primary-soft: #e6ecf7;
  --color-accent: #c98a2b;
  --color-accent-soft: #fbf1de;
  --color-bg: #f4f6f9;
  --color-surface: #ffffff;
  --color-text: #2b2f36;
  --color-muted: #6b7280;
  --color-line: #dde3ec;
  --color-line-strong: #c6cfdd;
  --color-ok: #3f7d5c;
  --color-ok-soft: #e7f2ec;
  --color-hold: #8a6a2f;
  --color-hold-soft: #f7efdf;

  --radius-sm: 4px;
  --radius: 6px;
  --radius-lg: 8px;

  --shadow-card: 0 1px 2px rgba(43, 47, 54, 0.05), 0 6px 16px rgba(43, 47, 54, 0.06);
  --shadow-lift: 0 2px 4px rgba(43, 47, 54, 0.07), 0 12px 26px rgba(47, 79, 143, 0.14);

  --shell-max: 1120px;
  --gutter: 24px;

  --font-sans: system-ui, -apple-system, "Segoe UI", "Source Han Sans SC", "Noto Sans CJK SC",
    "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-mono: ui-monospace, "SFMono-Regular", "Cascadia Mono", Menlo, Consolas, monospace;
}

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

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

body {
  margin: 0;
  background-color: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-sans);
  font-size: 16px;
  font-weight: 400;
  line-height: 1.75;
  letter-spacing: 0.01em;
}

h1,
h2,
h3,
h4 {
  margin: 0;
  color: var(--color-text);
  font-weight: 700;
  line-height: 1.3;
  letter-spacing: 0;
}

p {
  margin: 0;
}

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

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

figure {
  margin: 0;
}

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

a:hover {
  color: var(--color-primary-dark);
  text-decoration: underline;
}

button {
  font: inherit;
  color: inherit;
  cursor: pointer;
}

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

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

/* --------------------------------------------------------------------------
   2. layout —— 全站骨架：页头、主导航、主容器、页脚
   -------------------------------------------------------------------------- */
.site-body {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  background-color: var(--color-bg);
}

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

.header-inner {
  display: flex;
  align-items: center;
  gap: 20px;
  width: 100%;
  max-width: var(--shell-max);
  margin: 0 auto;
  padding: 12px var(--gutter);
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  flex: 0 0 auto;
  color: var(--color-text);
  text-decoration: none;
}

.brand:hover {
  text-decoration: none;
  color: var(--color-text);
}

.brand-mark {
  display: block;
  width: 34px;
  height: 34px;
  border-radius: var(--radius);
  background-color: var(--color-primary);
  box-shadow: inset 0 0 0 4px rgba(255, 255, 255, 0.22);
}

.brand-text {
  display: flex;
  flex-direction: column;
  line-height: 1.25;
}

.brand-name {
  font-size: 18px;
  font-weight: 700;
}

.brand-slogan {
  color: var(--color-muted);
  font-size: 12px;
  letter-spacing: 0.02em;
}

/* --- 主导航 --- */
.site-nav {
  flex: 1 1 auto;
  min-width: 0;
}

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

.nav-item {
  flex: 0 0 auto;
}

.nav-link {
  display: block;
  padding: 8px 12px;
  border-bottom: 2px solid transparent;
  color: var(--color-text);
  font-size: 15px;
  white-space: nowrap;
}

.nav-link:hover {
  color: var(--color-primary);
  text-decoration: none;
}

.nav-link.is-current {
  color: var(--color-primary);
  border-bottom-color: var(--color-primary);
  font-weight: 700;
}

.header-action {
  flex: 0 0 auto;
  padding: 8px 16px;
  border: 1px solid var(--color-accent);
  border-radius: var(--radius);
  background-color: var(--color-accent-soft);
  color: #8a5c14;
  font-size: 14px;
  font-weight: 700;
  white-space: nowrap;
}

.header-action:hover {
  background-color: var(--color-accent);
  color: #ffffff;
  text-decoration: none;
}

/* --- 汉堡按钮：桌面隐藏 --- */
.nav-toggle {
  display: none;
  flex: 0 0 auto;
  width: 44px;
  height: 44px;
  padding: 11px 10px;
  border: 1px solid var(--color-line-strong);
  border-radius: var(--radius);
  background-color: var(--color-surface);
  flex-direction: column;
  justify-content: space-between;
}

.nav-toggle-bar {
  display: block;
  height: 2px;
  border-radius: 2px;
  background-color: var(--color-text);
}

/* --- 主容器 --- */
.site-main {
  flex: 1 1 auto;
  width: 100%;
}

.inner-main {
  max-width: var(--shell-max);
  margin: 0 auto;
  padding: 22px var(--gutter) 56px;
}

/* --- 面包屑 --- */
.breadcrumb {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 18px;
  color: var(--color-muted);
  font-size: 14px;
}

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

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

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

.breadcrumb-current {
  color: var(--color-text);
  font-weight: 700;
}

/* --- 内页标题区 --- */
.page-header {
  padding-bottom: 20px;
  margin-bottom: 28px;
  border-bottom: 1px solid var(--color-line);
}

.page-title {
  font-size: 32px;
  font-weight: 700;
  color: var(--color-text);
}

.page-description {
  max-width: 760px;
  margin-top: 12px;
  color: var(--color-muted);
  font-size: 16px;
}

/* --- 页脚 --- */
.site-footer {
  background-color: #ffffff;
  border-top: 1px solid var(--color-line);
}

.footer-inner {
  display: grid;
  grid-template-columns: minmax(240px, 1.4fr) repeat(4, minmax(0, 1fr));
  gap: 28px 24px;
  width: 100%;
  max-width: var(--shell-max);
  margin: 0 auto;
  padding: 40px var(--gutter) 28px;
}

.footer-brand {
  min-width: 0;
}

.footer-name {
  font-size: 17px;
  font-weight: 700;
}

.footer-desc {
  margin-top: 10px;
  color: var(--color-muted);
  font-size: 14px;
  line-height: 1.7;
}

.footer-col {
  min-width: 0;
}

.footer-title {
  margin-bottom: 12px;
  color: var(--color-text);
  font-size: 15px;
  font-weight: 700;
}

.footer-list li + li {
  margin-top: 8px;
}

.footer-list a {
  color: var(--color-muted);
  font-size: 14px;
}

.footer-list a:hover {
  color: var(--color-primary);
}

.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  width: 100%;
  max-width: var(--shell-max);
  margin: 0 auto;
  padding: 16px var(--gutter) 28px;
  border-top: 1px solid var(--color-line);
}

.footer-note,
.footer-copy {
  color: var(--color-muted);
  font-size: 13px;
}

.back-to-top {
  flex: 0 0 auto;
  min-height: 40px;
  padding: 8px 14px;
  border: 1px solid var(--color-line-strong);
  border-radius: var(--radius);
  background-color: var(--color-surface);
  color: var(--color-primary);
  font-size: 13px;
  font-weight: 700;
  transition: background-color 0.18s ease, border-color 0.18s ease;
}

.back-to-top.is-visible {
  border-color: var(--color-primary);
}

.back-to-top:hover {
  background-color: var(--color-primary-soft);
}

/* --------------------------------------------------------------------------
   3. components —— 通用组件：按钮、标题组、卡片、列表、表格、FAQ
   -------------------------------------------------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 10px 20px;
  border: 1px solid transparent;
  border-radius: var(--radius);
  font-size: 15px;
  font-weight: 700;
  text-align: center;
}

.btn:hover {
  text-decoration: none;
}

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

.btn-primary:hover {
  background-color: var(--color-primary-dark);
  color: #ffffff;
}

.btn-ghost {
  border-color: var(--color-line-strong);
  background-color: var(--color-surface);
  color: var(--color-primary);
}

.btn-ghost:hover {
  border-color: var(--color-primary);
  background-color: var(--color-primary-soft);
  color: var(--color-primary-dark);
}

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

.btn-accent:hover {
  background-color: #b0761f;
  color: #ffffff;
}

/* --- 区块标题组（首页） --- */
.section-head {
  margin-bottom: 22px;
}

.section-title {
  font-size: 24px;
  font-weight: 700;
}

.section-desc {
  max-width: 780px;
  margin-top: 10px;
  color: var(--color-muted);
  font-size: 15px;
}

.section-foot {
  margin-top: 20px;
  font-size: 15px;
}

/* --- 内页内容区块 --- */
.content-section + .content-section {
  margin-top: 36px;
}

.content-section .section-title {
  padding-bottom: 10px;
  border-bottom: 1px solid var(--color-line);
}

.section-text,
.section-lead,
.section-intro {
  margin-top: 16px;
  color: var(--color-text);
}

.section-lead,
.section-intro {
  color: var(--color-muted);
}

.section-text + .section-text {
  margin-top: 12px;
}

/* --- 图片与说明 --- */
.section-media,
.section-figure {
  margin-top: 20px;
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  background-color: var(--color-surface);
  overflow: hidden;
}

.section-media img,
.section-figure img {
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  background-color: var(--color-primary-soft);
}

.section-media figcaption,
.section-figure figcaption {
  padding: 12px 16px;
  border-top: 1px solid var(--color-line);
  color: var(--color-muted);
  font-size: 14px;
}

/* --- 表格 --- */
.table-wrap {
  margin-top: 20px;
  overflow-x: auto;
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  background-color: var(--color-surface);
}

.field-table {
  min-width: 560px;
  font-size: 15px;
}

.field-caption,
.table-caption {
  padding: 12px 16px;
  border-bottom: 1px solid var(--color-line);
  color: var(--color-muted);
  font-size: 14px;
  text-align: left;
  caption-side: top;
}

.field-table th,
.field-table td {
  padding: 12px 16px;
  border-bottom: 1px solid var(--color-line);
  text-align: left;
  vertical-align: top;
}

.field-table thead th {
  background-color: var(--color-primary-soft);
  color: var(--color-primary-dark);
  font-size: 14px;
  font-weight: 700;
  white-space: nowrap;
}

.field-table tbody th {
  color: var(--color-text);
  font-weight: 700;
  white-space: nowrap;
}

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

.field-table tbody tr:hover {
  background-color: #fafbfd;
}

.field-table td:first-of-type {
  font-family: var(--font-mono);
  font-size: 14px;
}

/* --- 分步清单 --- */
.step-list {
  margin-top: 20px;
}

.step-item {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  padding: 16px 18px;
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  background-color: var(--color-surface);
}

.step-item + .step-item {
  margin-top: 12px;
}

.step-index {
  flex: 0 0 auto;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 30px;
  height: 30px;
  border-radius: 50%;
  background-color: var(--color-primary);
  color: #ffffff;
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 700;
}

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

.step-title {
  font-size: 17px;
  font-weight: 700;
}

.step-text {
  margin-top: 6px;
  color: var(--color-muted);
  font-size: 15px;
}

/* --- 边界说明块 --- */
.boundary-block {
  margin-top: 20px;
  padding: 22px;
  border: 1px solid var(--color-line);
  border-left: 4px solid var(--color-accent);
  border-radius: var(--radius);
  background-color: var(--color-surface);
}

.boundary-list li {
  position: relative;
  padding-left: 20px;
  font-size: 15px;
}

.boundary-list li + li {
  margin-top: 10px;
}

.boundary-list li::before {
  content: "";
  position: absolute;
  top: 11px;
  left: 2px;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background-color: var(--color-accent);
}

.boundary-feedback {
  margin-top: 20px;
  padding-top: 18px;
  border-top: 1px solid var(--color-line);
}

.feedback-title {
  font-size: 17px;
  font-weight: 700;
}

.feedback-text {
  margin: 8px 0 14px;
  color: var(--color-muted);
  font-size: 15px;
}

/* --- 规则 / 原则 / 建议 条目 --- */
.rule-list,
.principle-list,
.advice-list,
.overlap-list,
.note-list {
  margin-top: 18px;
}

.rule-item,
.principle-item,
.advice-item,
.overlap-item {
  padding: 16px 18px;
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  background-color: var(--color-surface);
}

.rule-item + .rule-item,
.principle-item + .principle-item,
.advice-item + .advice-item,
.overlap-item + .overlap-item {
  margin-top: 12px;
}

.rule-title,
.principle-name,
.advice-title,
.overlap-name {
  font-size: 17px;
  font-weight: 700;
}

.rule-text,
.principle-desc,
.advice-text,
.overlap-desc {
  margin-top: 6px;
  color: var(--color-muted);
  font-size: 15px;
}

/* 目录页：带状态标签的规则条目 */
.rule-section .rule-item {
  display: flex;
  align-items: flex-start;
  gap: 12px;
}

.rule-tag {
  flex: 0 0 auto;
  display: inline-block;
  padding: 3px 10px;
  border-radius: var(--radius-sm);
  font-size: 13px;
  font-weight: 700;
  white-space: nowrap;
}

.rule-tag-ok {
  background-color: var(--color-ok-soft);
  color: var(--color-ok);
}

.rule-tag-check {
  background-color: var(--color-primary-soft);
  color: var(--color-primary-dark);
}

.rule-tag-hold {
  background-color: var(--color-hold-soft);
  color: var(--color-hold);
}

.rule-section .rule-text {
  margin-top: 0;
  min-width: 0;
}

.rule-note,
.missing-note,
.section-tail,
.boundary-action {
  margin-top: 18px;
  color: var(--color-muted);
  font-size: 15px;
}

.section-tail a,
.missing-note a,
.boundary-action a {
  margin-right: 14px;
}

/* --- 观看指引：注意事项 --- */
.note-item {
  position: relative;
  padding: 12px 16px 12px 38px;
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  background-color: var(--color-surface);
  font-size: 15px;
}

.note-item + .note-item {
  margin-top: 10px;
}

.note-item::before {
  content: "";
  position: absolute;
  top: 20px;
  left: 16px;
  width: 8px;
  height: 8px;
  border: 2px solid var(--color-primary);
  border-radius: 50%;
}

/* --- FAQ --- */
.faq-list {
  margin-top: 18px;
}

.faq-item {
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  background-color: var(--color-surface);
}

.faq-item + .faq-item {
  margin-top: 10px;
}

.faq-question {
  position: relative;
  padding: 15px 46px 15px 18px;
  color: var(--color-text);
  font-size: 16px;
  font-weight: 700;
  cursor: pointer;
  list-style: none;
}

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

.faq-question::after {
  content: "+";
  position: absolute;
  top: 50%;
  right: 18px;
  transform: translateY(-50%);
  color: var(--color-primary);
  font-size: 20px;
  font-weight: 700;
  line-height: 1;
}

.faq-item[open] .faq-question::after {
  content: "−";
}

.faq-item[open] .faq-question {
  color: var(--color-primary-dark);
}

.faq-answer {
  padding: 0 18px 16px;
  border-top: 1px solid var(--color-line);
  color: var(--color-muted);
  font-size: 15px;
}

.faq-answer p {
  margin-top: 12px;
}

/* --- 侧栏 --- */
.aside-related,
.page-aside,
.sidebar {
  min-width: 0;
}

.aside-title {
  padding-bottom: 10px;
  border-bottom: 1px solid var(--color-line);
  font-size: 18px;
  font-weight: 700;
}

.aside-block,
.aside-group {
  margin-top: 18px;
  padding: 16px;
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  background-color: var(--color-surface);
}

.aside-subtitle {
  margin-bottom: 10px;
  color: var(--color-primary-dark);
  font-size: 15px;
  font-weight: 700;
}

.aside-list li + li {
  margin-top: 10px;
}

.aside-list a {
  display: block;
  position: relative;
  padding-left: 14px;
  font-size: 15px;
  line-height: 1.6;
}

.aside-list a::before {
  content: "";
  position: absolute;
  top: 10px;
  left: 0;
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background-color: var(--color-accent);
}

/* --------------------------------------------------------------------------
   4. pages —— 首页与各内页模块
   -------------------------------------------------------------------------- */

/* --- 通知横幅 --- */
.notice-banner {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
  padding: 12px 24px;
  background-color: var(--color-accent-soft);
  border-bottom: 1px solid #eadcc0;
  font-size: 14px;
}

.notice-banner.is-hidden {
  display: none;
}

.notice-text {
  flex: 1 1 auto;
  min-width: 0;
  color: #7a5312;
}

.notice-link {
  color: #7a5312;
  font-weight: 700;
  text-decoration: underline;
}

.notice-close {
  flex: 0 0 auto;
  width: 32px;
  height: 32px;
  border: 1px solid #d9c294;
  border-radius: var(--radius-sm);
  background-color: transparent;
  color: #7a5312;
  font-size: 16px;
  line-height: 1;
}

.notice-close:hover {
  background-color: #f2e2c4;
}

/* --- 首页首屏 --- */
.home-hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1.05fr);
  gap: 40px;
  align-items: center;
  max-width: var(--shell-max);
  margin: 0 auto;
  padding: 44px var(--gutter) 48px;
}

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

.hero-kicker {
  display: inline-block;
  padding: 4px 12px;
  border-radius: var(--radius-sm);
  background-color: var(--color-primary-soft);
  color: var(--color-primary-dark);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.02em;
}

.hero-title {
  margin-top: 16px;
  font-size: 40px;
  font-weight: 700;
}

.hero-desc {
  margin-top: 16px;
  color: var(--color-muted);
  font-size: 16px;
}

.hero-points {
  margin-top: 18px;
}

.hero-points li {
  position: relative;
  padding-left: 22px;
  font-size: 15px;
}

.hero-points li + li {
  margin-top: 8px;
}

.hero-points li::before {
  content: "";
  position: absolute;
  top: 11px;
  left: 2px;
  width: 7px;
  height: 7px;
  border-radius: 2px;
  background-color: var(--color-accent);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

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

.hero-figure {
  border: 1px solid var(--color-line);
  border-radius: var(--radius-lg);
  background-color: var(--color-surface);
  overflow: hidden;
  box-shadow: var(--shadow-card);
}

.hero-figure img {
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 10;
  object-fit: cover;
  background-color: var(--color-primary-soft);
}

.hero-caption {
  padding: 12px 16px;
  border-top: 1px solid var(--color-line);
  color: var(--color-muted);
  font-size: 14px;
}

.hero-thumbs {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
  margin-top: 12px;
}

.hero-thumb {
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  background-color: var(--color-surface);
  overflow: hidden;
}

.hero-thumb img {
  width: 100%;
  height: auto;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  background-color: var(--color-primary-soft);
}

/* --- 首页：题材频道索引 --- */
.home-channels,
.home-topics,
.home-fields,
.home-path,
.home-boundary {
  max-width: var(--shell-max);
  margin: 0 auto;
  padding: 40px var(--gutter);
}

.home-topics,
.home-path {
  background-color: #ffffff;
  max-width: none;
  border-top: 1px solid var(--color-line);
  border-bottom: 1px solid var(--color-line);
}

.home-topics > .section-head,
.home-topics > .topic-strip,
.home-topics > .section-foot,
.home-path > .section-head,
.home-path > .step-list,
.home-path > .section-foot {
  max-width: var(--shell-max);
  margin-left: auto;
  margin-right: auto;
}

.channel-list {
  border-top: 1px solid var(--color-line);
}

.channel-item {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  padding: 18px 4px;
  border-bottom: 1px solid var(--color-line);
}

.channel-dot {
  flex: 0 0 auto;
  width: 12px;
  height: 12px;
  margin-top: 9px;
  border-radius: 50%;
  background-color: var(--color-primary);
  transition: transform 0.18s ease;
}

.channel-item:hover .channel-dot {
  transform: scale(1.4);
}

.channel-body {
  flex: 1 1 auto;
  min-width: 0;
}

.channel-name {
  font-size: 18px;
  font-weight: 700;
}

.channel-scope {
  margin-top: 6px;
  color: var(--color-muted);
  font-size: 15px;
}

.channel-boundary {
  margin-top: 6px;
  color: var(--color-muted);
  font-size: 14px;
}

.channel-link {
  flex: 0 0 auto;
  align-self: center;
  font-size: 15px;
  font-weight: 700;
  white-space: nowrap;
}

.channel-item:hover .channel-link {
  text-decoration: underline;
}

/* --- 首页：专题速览 --- */
.topic-strip {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 20px;
}

.topic-card {
  display: flex;
  flex-direction: column;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-lg);
  background-color: var(--color-surface);
  overflow: hidden;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.topic-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-lift);
}

.topic-figure,
.topic-cover {
  border-bottom: 1px solid var(--color-line);
  background-color: var(--color-primary-soft);
}

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

.topic-name {
  padding: 16px 18px 0;
  font-size: 18px;
  font-weight: 700;
}

.topic-scope {
  padding: 8px 18px 0;
  color: var(--color-muted);
  font-size: 15px;
}

.topic-count {
  padding: 8px 18px 0;
  color: var(--color-primary-dark);
  font-family: var(--font-mono);
  font-size: 14px;
}

.topic-order {
  padding: 8px 18px 0;
  color: var(--color-muted);
  font-size: 14px;
}

.topic-link {
  margin: 16px 18px 18px;
  padding-top: 12px;
  border-top: 1px solid var(--color-line);
  font-size: 15px;
  font-weight: 700;
}

/* 专题页卡片内部结构（封面 + 正文容器） */
.topic-list-section .topic-card {
  flex-direction: row;
  align-items: stretch;
}

.topic-list-section .topic-cover {
  flex: 0 0 240px;
  border-bottom: 0;
  border-right: 1px solid var(--color-line);
}

.topic-list-section .topic-cover img {
  height: 100%;
  aspect-ratio: auto;
  min-height: 168px;
}

.topic-body {
  flex: 1 1 auto;
  min-width: 0;
  padding: 18px;
  display: flex;
  flex-direction: column;
}

.topic-body .topic-name {
  padding: 0;
}

.topic-body .topic-scope,
.topic-body .topic-count,
.topic-body .topic-order {
  padding: 8px 0 0;
}

.topic-body .topic-link {
  margin: auto 0 0;
  padding-top: 14px;
}

/* --- 首页：查阅路径（白底区块内的步骤） --- */
.home-path .step-list,
.steps-section .step-list {
  margin-top: 20px;
}

/* --- 内页通用两栏布局 --- */
.page-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 300px;
  gap: 40px;
  align-items: start;
}

.main-column,
.page-main,
.layout-body {
  min-width: 0;
}

/* 侧栏在左的变体：作用于祖先节点 */
.sidebar-left .page-layout {
  grid-template-columns: 300px minmax(0, 1fr);
}

.sidebar-left .page-layout > .main-column,
.sidebar-left .page-layout > .page-main,
.sidebar-left .page-layout > .layout-body {
  order: 2;
}

.sidebar-left .page-layout > .aside-related,
.sidebar-left .page-layout > .page-aside,
.sidebar-left .page-layout > .sidebar {
  order: 1;
}

/* --- 题材频道页：频道条目 --- */
.channel-entry {
  display: grid;
  grid-template-columns: 220px minmax(0, 1fr);
  gap: 20px;
  padding: 18px;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-lg);
  background-color: var(--color-surface);
}

.channel-entry + .channel-entry {
  margin-top: 16px;
}

.channel-entry .channel-figure {
  border-radius: var(--radius);
  background-color: var(--color-primary-soft);
  overflow: hidden;
}

.channel-entry .channel-figure img {
  width: 100%;
  height: 100%;
  min-height: 148px;
  aspect-ratio: 4 / 3;
  object-fit: cover;
}

.channel-entry .channel-body {
  display: flex;
  flex-direction: column;
}

.channel-entry .channel-link {
  align-self: flex-start;
  margin-top: 12px;
  padding-top: 12px;
  border-top: 1px solid var(--color-line);
  width: 100%;
}

/* 首页频道条目内的色点（与频道页区分作用域） */
.home-channels .channel-dot {
  background-color: var(--color-primary);
}

/* --- 目录页：缺失字段卡片 --- */
.missing-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
  margin-top: 18px;
}

.missing-card {
  padding: 18px;
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  background-color: var(--color-surface);
}

.missing-title {
  font-size: 17px;
  font-weight: 700;
}

.missing-text {
  margin-top: 8px;
  color: var(--color-muted);
  font-size: 15px;
}

/* --- 404 --- */
.error-main {
  max-width: var(--shell-max);
  margin: 0 auto;
  padding: 56px var(--gutter) 64px;
}

.error-panel {
  padding: 36px 32px;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-lg);
  background-color: var(--color-surface);
  box-shadow: var(--shadow-card);
}

.error-code {
  font-family: var(--font-mono);
  font-size: 40px;
  font-weight: 700;
  color: var(--color-primary);
  line-height: 1;
}

.error-panel h1 {
  margin-top: 14px;
  font-size: 28px;
}

.error-text {
  max-width: 720px;
  margin-top: 12px;
  color: var(--color-muted);
  font-size: 16px;
}

.error-actions {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 12px;
  margin-top: 26px;
}

.error-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 10px 16px;
  border: 1px solid var(--color-line-strong);
  border-radius: var(--radius);
  background-color: var(--color-surface);
  color: var(--color-primary);
  font-size: 15px;
  font-weight: 700;
  text-align: center;
}

.error-btn:hover {
  border-color: var(--color-primary);
  background-color: var(--color-primary-soft);
  text-decoration: none;
}

.error-btn-primary {
  border-color: var(--color-primary);
  background-color: var(--color-primary);
  color: #ffffff;
}

.error-btn-primary:hover {
  background-color: var(--color-primary-dark);
  color: #ffffff;
}

.error-hint {
  margin-top: 32px;
}

.error-hint h2 {
  font-size: 20px;
}

.error-hint-list {
  margin-top: 16px;
}

.error-hint-list li {
  position: relative;
  padding: 10px 16px 10px 34px;
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  background-color: var(--color-surface);
  font-size: 15px;
}

.error-hint-list li + li {
  margin-top: 10px;
}

.error-hint-list li::before {
  content: "";
  position: absolute;
  top: 19px;
  left: 16px;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background-color: var(--color-accent);
}

/* --- 滚动出现动画（仅内页模块标题，尊重减弱动效） --- */
@media (prefers-reduced-motion: no-preference) {
  .content-section .section-title.reveal-ready {
    transform: translateY(8px);
    transition: transform 0.35s ease;
  }

  .content-section .section-title.reveal-in {
    transform: none;
  }
}

/* --------------------------------------------------------------------------
   5. responsive —— 1024 / 768 / 480 三档断点
   -------------------------------------------------------------------------- */
@media (max-width: 1024px) {
  .footer-inner {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .footer-brand {
    grid-column: 1 / -1;
  }

  .page-layout {
    grid-template-columns: minmax(0, 1fr) 260px;
    gap: 28px;
  }

  .sidebar-left .page-layout {
    grid-template-columns: 260px minmax(0, 1fr);
  }

  .topic-list-section .topic-cover {
    flex-basis: 200px;
  }
}

@media (max-width: 768px) {
  body {
    font-size: 15px;
  }

  .header-inner {
    flex-wrap: wrap;
    gap: 12px;
    padding: 10px 16px;
  }

  .nav-toggle {
    display: flex;
    order: 2;
    margin-left: 0;
  }

  .site-nav {
    order: 4;
    flex: 1 0 100%;
    min-width: 0;
  }

  .nav-list {
    display: none;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 6px 0 10px;
    border-top: 1px solid var(--color-line);
  }

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

  .nav-link {
    min-height: 44px;
    display: flex;
    align-items: center;
    padding: 10px 4px;
    border-bottom: 1px solid var(--color-line);
    font-size: 16px;
  }

  .nav-link.is-current {
    border-bottom-color: var(--color-line);
    color: var(--color-primary);
  }

  .header-action {
    order: 3;
    margin-left: auto;
  }

  .inner-main {
    padding: 18px 16px 44px;
  }

  .page-title {
    font-size: 24px;
  }

  .page-description {
    font-size: 15px;
  }

  .home-hero {
    grid-template-columns: minmax(0, 1fr);
    gap: 28px;
    padding: 32px 16px 36px;
  }

  .hero-title {
    font-size: 28px;
  }

  .home-channels,
  .home-topics,
  .home-fields,
  .home-path,
  .home-boundary {
    padding: 30px 16px;
  }

  .notice-banner {
    padding: 12px 16px;
  }

  .section-title {
    font-size: 20px;
  }

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

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

  .sidebar-left .page-layout > .main-column,
  .sidebar-left .page-layout > .page-main,
  .sidebar-left .page-layout > .layout-body,
  .sidebar-left .page-layout > .aside-related,
  .sidebar-left .page-layout > .page-aside,
  .sidebar-left .page-layout > .sidebar {
    order: initial;
  }

  .channel-entry {
    grid-template-columns: minmax(0, 1fr);
    gap: 14px;
  }

  .channel-entry .channel-figure img {
    aspect-ratio: 16 / 9;
    min-height: 0;
  }

  .topic-list-section .topic-card {
    flex-direction: column;
  }

  .topic-list-section .topic-cover {
    flex: 0 0 auto;
    border-right: 0;
    border-bottom: 1px solid var(--color-line);
  }

  .topic-list-section .topic-cover img {
    height: auto;
    aspect-ratio: 16 / 9;
    min-height: 0;
  }

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

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

  .error-panel {
    padding: 26px 20px;
  }

  .footer-inner {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 24px 20px;
    padding: 32px 16px 22px;
  }

  .footer-bottom {
    flex-wrap: wrap;
    padding: 14px 16px 24px;
  }
}

@media (max-width: 480px) {
  .brand-slogan {
    display: none;
  }

  .hero-actions {
    flex-direction: column;
    align-items: stretch;
  }

  .hero-actions .btn {
    width: 100%;
  }

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

  .channel-item {
    flex-wrap: wrap;
    gap: 10px 12px;
  }

  .channel-link {
    align-self: flex-start;
    margin-left: 28px;
  }

  .step-item {
    padding: 14px;
    gap: 12px;
  }

  .rule-section .rule-item {
    flex-direction: column;
    gap: 8px;
  }

  .boundary-block {
    padding: 18px 16px;
  }

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

  .error-code {
    font-size: 32px;
  }

  .error-panel h1 {
    font-size: 22px;
  }

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

  .footer-bottom {
    flex-direction: column;
    align-items: flex-start;
  }
}