/* ==========================================================================
   被窝电影网 · 全站样式表
   分组：base / layout / components / pages / responsive
   ========================================================================== */

/* --------------------------------------------------------------------------
   1. base — 变量、重置、排版基元
   -------------------------------------------------------------------------- */

:root {
  --ink: #1c1f24;
  --ink-soft: #4a5058;
  --ink-mute: #8a9099;
  --accent: #7a5c3e;
  --paper: #fbfaf8;
  --card: #ffffff;
  --rule: #e2ded7;
  --rule-soft: #efece6;

  --font-serif: "Songti SC", "SimSun", "Noto Serif CJK SC", Georgia, serif;
  --font-sans: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  --font-mono: "SFMono-Regular", Menlo, Consolas, "Courier New", monospace;

  --wrap: 1120px;
  --wrap-narrow: 860px;
  --gutter: 28px;
  --radius: 6px;
  --header-h: 76px;
}

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

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

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink-soft);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.85;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

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

p {
  margin: 0;
}

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

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

a:hover,
a:focus-visible {
  color: var(--accent);
}

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

figure {
  margin: 0;
}

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

button {
  font: inherit;
  color: inherit;
}

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

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

/* --------------------------------------------------------------------------
   2. layout — 骨架：页头、导航、主容器、页脚
   -------------------------------------------------------------------------- */

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

/* 顶部信息条 */
.topbar {
  background: var(--ink);
  color: #d9d5cd;
}

.topbar-text {
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 9px var(--gutter);
  font-size: 13px;
  line-height: 1.6;
  letter-spacing: 0.01em;
}

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

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  max-width: var(--wrap);
  min-height: var(--header-h);
  margin: 0 auto;
  padding: 12px var(--gutter);
}

.brand {
  display: flex;
  flex-direction: column;
  gap: 3px;
  min-width: 0;
}

.brand-name {
  font-family: var(--font-serif);
  font-size: 22px;
  font-weight: 600;
  line-height: 1.2;
  color: var(--ink);
}

.brand-slogan {
  font-size: 12px;
  line-height: 1.4;
  color: var(--ink-mute);
  letter-spacing: 0.04em;
}

/* 主导航 */
.site-nav {
  display: block;
}

.nav-list {
  display: flex;
  align-items: center;
  gap: 26px;
}

.nav-item {
  list-style: none;
}

.nav-link {
  display: inline-block;
  padding: 6px 0 8px;
  font-size: 15px;
  color: var(--ink-soft);
  border-bottom: 2px solid transparent;
}

.nav-link:hover,
.nav-link:focus-visible {
  color: var(--accent);
  border-bottom-color: var(--accent);
}

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

/* 汉堡按钮 */
.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 46px;
  height: 46px;
  padding: 0 11px;
  background: var(--card);
  border: 1px solid var(--rule);
  border-radius: var(--radius);
  cursor: pointer;
}

.nav-toggle-bar {
  display: block;
  width: 100%;
  height: 2px;
  background: var(--ink);
  transition: transform 0.2s ease, opacity 0.2s ease;
}

.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(2) {
  opacity: 0;
}

.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

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

.inner-main {
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 26px var(--gutter) 64px;
}

.home-main {
  max-width: none;
  padding: 0 0 64px;
}

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

.footer-inner {
  display: grid;
  grid-template-columns: minmax(240px, 1.6fr) repeat(3, minmax(140px, 1fr));
  gap: 32px;
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 46px var(--gutter) 34px;
}

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

.footer-name {
  font-family: var(--font-serif);
  font-size: 19px;
  font-weight: 600;
  color: var(--ink);
}

.footer-desc {
  margin-top: 10px;
  max-width: 34em;
  font-size: 13.5px;
  line-height: 1.85;
  color: var(--ink-mute);
}

.footer-title {
  margin-bottom: 12px;
  font-family: var(--font-sans);
  font-size: 13px;
  font-weight: 600;
  color: var(--ink);
  letter-spacing: 0.06em;
}

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

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

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

.footer-bottom {
  border-top: 1px solid var(--rule-soft);
}

.footer-copy {
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 16px var(--gutter) 22px;
  font-size: 12.5px;
  color: var(--ink-mute);
}

/* --------------------------------------------------------------------------
   3. components — 通用组件：按钮、区块标题、表格、卡片、链接、折叠块
   -------------------------------------------------------------------------- */

/* 按钮 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  padding: 10px 22px;
  border: 1px solid transparent;
  border-radius: var(--radius);
  font-size: 15px;
  line-height: 1.4;
  text-align: center;
  cursor: pointer;
}

.btn-primary {
  background: var(--ink);
  color: #f6f4f0;
  border-color: var(--ink);
}

.btn-primary:hover,
.btn-primary:focus-visible {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}

.btn-ghost {
  background: transparent;
  color: var(--ink);
  border-color: var(--rule);
}

.btn-ghost:hover,
.btn-ghost:focus-visible {
  color: var(--accent);
  border-color: var(--accent);
}

.btn-plain {
  background: transparent;
  color: var(--ink-soft);
  border-color: transparent;
  padding-left: 4px;
  padding-right: 4px;
  text-decoration: underline;
  text-underline-offset: 4px;
}

.btn-plain:hover,
.btn-plain:focus-visible {
  color: var(--accent);
}

/* 区块通用 */
.section {
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 52px var(--gutter) 0;
}

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

.section-title {
  padding-top: 18px;
  border-top: 1px solid var(--rule);
  font-size: 25px;
  letter-spacing: 0.01em;
}

.section-desc {
  margin-top: 10px;
  max-width: 62em;
  font-size: 15px;
  line-height: 1.9;
  color: var(--ink-soft);
}

.section-lead {
  margin-top: 10px;
  max-width: 62em;
  font-size: 15px;
  line-height: 1.9;
  color: var(--ink-soft);
}

.section-note {
  margin-top: 16px;
  font-size: 14px;
  line-height: 1.9;
  color: var(--ink-mute);
}

.section-foot {
  margin-top: 18px;
  font-size: 14px;
}

.sub-title {
  margin-bottom: 14px;
  font-size: 18px;
}

.subsection-title {
  margin-bottom: 10px;
  font-size: 17px;
}

/* 文本链接 */
.text-link {
  display: inline-block;
  padding-bottom: 2px;
  color: var(--accent);
  border-bottom: 1px solid rgba(122, 92, 62, 0.35);
}

.text-link:hover,
.text-link:focus-visible {
  border-bottom-color: var(--accent);
}

/* 表格 */
.table-wrap,
.table-scroll {
  overflow-x: auto;
  border: 1px solid var(--rule);
  border-radius: var(--radius);
  background: var(--card);
}

.data-table {
  width: 100%;
  min-width: 640px;
  font-size: 14.5px;
}

.data-table thead th {
  padding: 13px 16px;
  background: #f5f2ed;
  border-bottom: 1px solid var(--rule);
  color: var(--ink);
  font-family: var(--font-sans);
  font-size: 13px;
  font-weight: 600;
  text-align: left;
  letter-spacing: 0.05em;
  white-space: nowrap;
}

.data-table tbody td {
  padding: 14px 16px;
  border-bottom: 1px solid var(--rule-soft);
  color: var(--ink-soft);
  line-height: 1.8;
  vertical-align: top;
}

.data-table tbody tr:last-child td {
  border-bottom: 0;
}

.data-table tbody tr:hover td {
  background: #fcfbf9;
}

.cell-code,
.cell-name {
  font-family: var(--font-mono);
  font-size: 13.5px;
  color: var(--ink);
  white-space: nowrap;
}

.cell-name {
  font-family: var(--font-sans);
  font-size: 15px;
  font-weight: 600;
}

/* 字段小表 */
.field-table {
  width: 100%;
  border: 1px solid var(--rule);
  border-radius: var(--radius);
  background: var(--card);
  font-size: 14.5px;
}

.field-table thead th {
  padding: 12px 16px;
  background: #f5f2ed;
  border-bottom: 1px solid var(--rule);
  font-family: var(--font-sans);
  font-size: 13px;
  font-weight: 600;
  color: var(--ink);
  text-align: left;
  letter-spacing: 0.05em;
}

.field-table tbody td {
  padding: 13px 16px;
  border-bottom: 1px solid var(--rule-soft);
  vertical-align: top;
  line-height: 1.85;
}

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

.field-name {
  width: 34%;
  font-family: var(--font-mono);
  font-size: 13.5px;
  color: var(--ink);
  white-space: nowrap;
}

.field-desc {
  color: var(--ink-soft);
}

.field-desc a {
  color: var(--accent);
  border-bottom: 1px solid rgba(122, 92, 62, 0.35);
}

/* 边界列表 */
.boundary-list {
  display: grid;
  gap: 10px;
}

.boundary-item {
  position: relative;
  padding-left: 24px;
  font-size: 14.5px;
  line-height: 1.85;
}

.boundary-item::before {
  position: absolute;
  left: 0;
  top: 0;
  font-family: var(--font-mono);
  font-size: 13px;
}

.boundary-yes::before {
  content: "✓";
  color: var(--accent);
}

.boundary-no::before {
  content: "—";
  color: var(--ink-mute);
}

.boundary-note {
  margin-top: 14px;
  font-size: 13.5px;
  line-height: 1.85;
  color: var(--ink-mute);
}

/* 图片容器 */
.hero-media,
.special-media,
.special-card-media,
.media-figure,
.guide-media,
.scope-figure {
  overflow: hidden;
  border: 1px solid var(--rule);
  border-radius: var(--radius);
  background: var(--card);
}

.hero-media img,
.special-media img,
.special-card-media img,
.media-figure img,
.guide-media img,
.scope-figure img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.hero-caption,
.media-caption,
.figure-caption {
  padding: 10px 14px;
  border-top: 1px solid var(--rule-soft);
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--ink-mute);
}

/* 相关入口列表 */
.related-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 12px;
}

.related-item {
  border: 1px solid var(--rule);
  border-radius: var(--radius);
  background: var(--card);
}

.related-item a {
  display: block;
  padding: 14px 16px;
  font-size: 14.5px;
  color: var(--ink);
}

.related-item a:hover,
.related-item a:focus-visible {
  color: var(--accent);
}

/* 内页通用：面包屑与页面标题区 */
.breadcrumb {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 18px;
  font-size: 13px;
  color: var(--ink-mute);
}

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

.breadcrumb a:hover,
.breadcrumb a:focus-visible {
  color: var(--accent);
}

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

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

.page-header {
  margin-bottom: 34px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--rule);
}

.page-title {
  font-size: 32px;
  line-height: 1.32;
  color: var(--ink);
}

.page-description {
  margin-top: 14px;
  max-width: 60em;
  font-size: 15.5px;
  line-height: 1.9;
  color: var(--ink-soft);
}

/* 内页区块间距 */
.inner-main .section {
  max-width: none;
  margin: 0;
  padding: 40px 0 0;
}

.inner-main .section-title {
  font-size: 23px;
}

/* --------------------------------------------------------------------------
   4. pages — 首页
   -------------------------------------------------------------------------- */

/* 首屏 */
.hero {
  border-bottom: 1px solid var(--rule);
}

.hero-inner {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(0, 1fr);
  align-items: center;
  gap: 48px;
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 56px var(--gutter) 52px;
}

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

.hero-eyebrow {
  margin-bottom: 14px;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.08em;
  color: var(--accent);
}

.hero-title {
  font-size: 38px;
  line-height: 1.3;
  color: var(--ink);
}

.hero-lead {
  margin-top: 18px;
  max-width: 34em;
  font-size: 16px;
  line-height: 1.95;
  color: var(--ink-soft);
}

.hero-points {
  display: grid;
  gap: 8px;
  margin-top: 22px;
}

.hero-point {
  position: relative;
  padding-left: 20px;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--ink-soft);
}

.hero-point::before {
  content: "";
  position: absolute;
  left: 0;
  top: 12px;
  width: 8px;
  height: 1px;
  background: var(--accent);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

.hero-media img {
  aspect-ratio: 4 / 3;
}

/* 频道线索总览 */
.section-channels .table-wrap {
  margin-top: 4px;
}

/* 专题片单入口 */
.special-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 22px;
}

.special-card {
  display: flex;
  flex-direction: column;
  overflow: hidden;
  border: 1px solid var(--rule);
  border-radius: var(--radius);
  background: var(--card);
}

.special-media {
  border: 0;
  border-bottom: 1px solid var(--rule-soft);
  border-radius: 0;
}

.special-media img {
  aspect-ratio: 16 / 9;
}

.special-body {
  padding: 16px 18px 18px;
}

.special-name {
  font-size: 18px;
  line-height: 1.45;
}

.special-name a {
  color: var(--ink);
}

.special-name a:hover,
.special-name a:focus-visible {
  color: var(--accent);
}

.special-scope {
  margin-top: 10px;
  font-size: 14px;
  line-height: 1.85;
  color: var(--ink-soft);
}

.special-boundary {
  margin-top: 8px;
  padding-top: 8px;
  border-top: 1px solid var(--rule-soft);
  font-size: 13.5px;
  line-height: 1.8;
  color: var(--ink-mute);
}

/* 字段与收录边界摘要 */
.fields-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: 34px;
}

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

.fields-col-boundary .boundary-list {
  padding: 16px 18px;
  border: 1px solid var(--rule);
  border-radius: var(--radius);
  background: var(--card);
}

/* 整理记录速览 */
.record-groups {
  display: grid;
  gap: 26px;
}

.record-group {
  padding: 18px 20px 6px;
  border: 1px solid var(--rule);
  border-radius: var(--radius);
  background: var(--card);
}

.record-month {
  padding-bottom: 10px;
  border-bottom: 1px solid var(--rule-soft);
  font-size: 17px;
  font-family: var(--font-mono);
  font-weight: 600;
  letter-spacing: 0.04em;
}

.record-list {
  display: grid;
}

.record-item {
  display: grid;
  grid-template-columns: 96px 78px minmax(0, 1fr);
  gap: 14px;
  align-items: baseline;
  padding: 12px 0;
  border-bottom: 1px solid var(--rule-soft);
}

.record-item:last-child {
  border-bottom: 0;
}

.record-date {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--ink-mute);
  white-space: nowrap;
}

.record-type {
  display: inline-block;
  padding: 2px 8px;
  border: 1px solid var(--rule);
  border-radius: 4px;
  font-size: 12px;
  line-height: 1.6;
  color: var(--accent);
  text-align: center;
  white-space: nowrap;
}

.record-text {
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--ink-soft);
}

/* 站内页面索引 */
.index-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 20px;
}

.index-col {
  min-width: 0;
  padding: 18px 20px;
  border: 1px solid var(--rule);
  border-radius: var(--radius);
  background: var(--card);
}

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

.index-name a {
  color: var(--ink);
}

.index-name a:hover,
.index-name a:focus-visible {
  color: var(--accent);
}

.index-desc {
  margin-top: 10px;
  font-size: 13.5px;
  line-height: 1.85;
  color: var(--ink-mute);
}

/* --------------------------------------------------------------------------
   5. pages — 题材频道
   -------------------------------------------------------------------------- */

.section-channel-table .media-figure {
  margin: 20px 0 22px;
}

.section-channel-table .media-figure img {
  aspect-ratio: 21 / 9;
}

.section-channel-basis .basis-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 20px;
  margin-bottom: 26px;
}

.basis-item {
  min-width: 0;
  padding: 18px 20px;
  border: 1px solid var(--rule);
  border-radius: var(--radius);
  background: var(--card);
}

.basis-title {
  margin-bottom: 10px;
  font-size: 17px;
}

.basis-item p {
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--ink-soft);
}

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

.section-channel-advice .advice-list {
  display: grid;
  gap: 16px;
}

.advice-item {
  padding: 18px 20px;
  border: 1px solid var(--rule);
  border-left: 3px solid var(--accent);
  border-radius: var(--radius);
  background: var(--card);
}

.advice-title {
  margin-bottom: 8px;
  font-size: 17px;
}

.advice-item p {
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--ink-soft);
}

.advice-link {
  margin-top: 8px;
  font-size: 14px;
}

.advice-link a {
  color: var(--accent);
  border-bottom: 1px solid rgba(122, 92, 62, 0.35);
}

/* --------------------------------------------------------------------------
   6. pages — 专题片单
   -------------------------------------------------------------------------- */

.special-cards {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 22px;
}

.special-card-media {
  border: 0;
  border-bottom: 1px solid var(--rule-soft);
  border-radius: 0;
}

.special-card-media img {
  aspect-ratio: 16 / 9;
}

.special-card-body {
  padding: 16px 18px 18px;
}

.special-card-title {
  font-size: 18px;
  line-height: 1.45;
}

.special-card-scope,
.special-card-boundary {
  margin-top: 10px;
  font-size: 14px;
  line-height: 1.85;
  color: var(--ink-soft);
}

.special-card-boundary {
  margin-top: 8px;
  padding-top: 8px;
  border-top: 1px solid var(--rule-soft);
  font-size: 13.5px;
  color: var(--ink-mute);
}

.field-label {
  display: inline-block;
  margin-right: 6px;
  padding: 1px 7px;
  border: 1px solid var(--rule);
  border-radius: 4px;
  font-size: 12px;
  line-height: 1.7;
  color: var(--accent);
  white-space: nowrap;
}

.section-inclusion .inclusion-list {
  display: grid;
  gap: 14px;
  counter-reset: inclusion;
}

.inclusion-item {
  position: relative;
  padding: 16px 20px 16px 56px;
  border: 1px solid var(--rule);
  border-radius: var(--radius);
  background: var(--card);
  counter-increment: inclusion;
}

.inclusion-item::before {
  content: counter(inclusion, decimal-leading-zero);
  position: absolute;
  left: 20px;
  top: 18px;
  font-family: var(--font-mono);
  font-size: 15px;
  color: var(--accent);
}

.inclusion-title {
  margin-bottom: 8px;
  font-size: 17px;
}

.inclusion-text {
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--ink-soft);
}

.relation-table {
  border: 1px solid var(--rule);
  border-radius: var(--radius);
  background: var(--card);
  font-size: 14.5px;
}

.relation-caption {
  padding: 10px 14px;
  border-bottom: 1px solid var(--rule-soft);
  font-size: 13px;
  color: var(--ink-mute);
  text-align: left;
}

.relation-table thead th {
  padding: 12px 16px;
  background: #f5f2ed;
  border-bottom: 1px solid var(--rule);
  font-family: var(--font-sans);
  font-size: 13px;
  font-weight: 600;
  color: var(--ink);
  text-align: left;
  letter-spacing: 0.05em;
}

.relation-table tbody th,
.relation-table tbody td {
  padding: 13px 16px;
  border-bottom: 1px solid var(--rule-soft);
  text-align: left;
  vertical-align: top;
  line-height: 1.85;
  color: var(--ink-soft);
}

.relation-table tbody th {
  width: 22%;
  font-family: var(--font-mono);
  font-size: 13.5px;
  font-weight: 600;
  color: var(--ink);
  white-space: nowrap;
}

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

.relation-note {
  margin-top: 16px;
  font-size: 14px;
  line-height: 1.9;
  color: var(--ink-mute);
}

.relation-note a {
  color: var(--accent);
  border-bottom: 1px solid rgba(122, 92, 62, 0.35);
}

.relation-note a + a {
  margin-left: 14px;
}

/* --------------------------------------------------------------------------
   7. pages — 整理记录
   -------------------------------------------------------------------------- */

.page-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 200px;
  gap: 36px;
  align-items: start;
}

.sidebar-left .page-layout,
.page-layout.sidebar-left {
  grid-template-columns: 200px minmax(0, 1fr);
}

.layout-content {
  min-width: 0;
}

.records-index {
  position: sticky;
  top: calc(var(--header-h) + 20px);
  padding: 16px 18px;
  border: 1px solid var(--rule);
  border-radius: var(--radius);
  background: var(--card);
}

.aside-title {
  margin-bottom: 12px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--rule-soft);
  font-family: var(--font-sans);
  font-size: 13px;
  font-weight: 600;
  color: var(--ink);
  letter-spacing: 0.06em;
}

.month-list li + li {
  margin-top: 6px;
}

.month-item a {
  display: block;
  padding: 7px 2px;
  font-family: var(--font-mono);
  font-size: 13.5px;
  color: var(--ink-soft);
  border-bottom: 1px solid transparent;
}

.month-item a:hover,
.month-item a:focus-visible {
  color: var(--accent);
  border-bottom-color: var(--accent);
}

.records-section .section-title,
.types-section .section-title,
.scope-section .section-title,
.related-section .section-title {
  font-size: 23px;
}

.records-section .section-lead,
.types-section .section-lead,
.scope-section .section-lead,
.related-section .section-lead {
  margin-bottom: 22px;
}

.record-group {
  padding: 18px 20px 6px;
  border: 1px solid var(--rule);
  border-radius: var(--radius);
  background: var(--card);
  scroll-margin-top: calc(var(--header-h) + 24px);
}

.record-group + .record-group {
  margin-top: 20px;
}

.group-title {
  padding-bottom: 10px;
  border-bottom: 1px solid var(--rule-soft);
  font-family: var(--font-mono);
  font-size: 17px;
  font-weight: 600;
  letter-spacing: 0.04em;
}

.types-section,
.scope-section,
.related-section {
  margin-top: 44px;
}

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

.type-card {
  min-width: 0;
  padding: 18px 20px;
  border: 1px solid var(--rule);
  border-radius: var(--radius);
  background: var(--card);
}

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

.type-desc {
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--ink-soft);
}

.scope-figure {
  margin-bottom: 22px;
}

.scope-figure img {
  aspect-ratio: 21 / 9;
}

.scope-table {
  border: 1px solid var(--rule);
  border-radius: var(--radius);
  background: var(--card);
  font-size: 14.5px;
}

.table-caption {
  padding: 10px 14px;
  border-bottom: 1px solid var(--rule-soft);
  font-size: 13px;
  color: var(--ink-mute);
  text-align: left;
}

.scope-table thead th {
  padding: 12px 16px;
  background: #f5f2ed;
  border-bottom: 1px solid var(--rule);
  font-family: var(--font-sans);
  font-size: 13px;
  font-weight: 600;
  color: var(--ink);
  text-align: left;
  letter-spacing: 0.05em;
}

.scope-table tbody td {
  padding: 13px 16px;
  border-bottom: 1px solid var(--rule-soft);
  vertical-align: top;
  line-height: 1.85;
  color: var(--ink-soft);
}

.scope-table tbody tr:last-child td {
  border-bottom: 0;
}

.scope-table tbody td:first-child {
  font-family: var(--font-mono);
  font-size: 13.5px;
  color: var(--ink);
  white-space: nowrap;
}

/* --------------------------------------------------------------------------
   8. pages — 观看指引
   -------------------------------------------------------------------------- */

.guide-section {
  margin-top: 44px;
}

.guide-section:first-of-type {
  margin-top: 0;
}

.guide-section .section-title {
  font-size: 23px;
}

.guide-section .section-lead {
  margin-bottom: 22px;
}

.guide-media {
  margin-bottom: 22px;
}

.guide-media img {
  aspect-ratio: 21 / 9;
}

.boundary-columns {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 22px;
}

.boundary-col {
  min-width: 0;
  padding: 18px 20px;
  border: 1px solid var(--rule);
  border-radius: var(--radius);
  background: var(--card);
}

.boundary-include {
  border-top: 3px solid var(--accent);
}

.boundary-exclude {
  border-top: 3px solid var(--ink-mute);
}

.boundary-col .boundary-list li {
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--ink-soft);
}

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

.prepare-item {
  min-width: 0;
  padding: 18px 20px;
  border: 1px solid var(--rule);
  border-radius: var(--radius);
  background: var(--card);
}

.prepare-text {
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--ink-soft);
}

.faq-list {
  display: grid;
  gap: 12px;
}

.faq-item {
  border: 1px solid var(--rule);
  border-radius: var(--radius);
  background: var(--card);
}

.faq-question {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 15px 18px;
  font-family: var(--font-serif);
  font-size: 16.5px;
  font-weight: 600;
  color: var(--ink);
  cursor: pointer;
  list-style: none;
}

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

.faq-question::before {
  content: "＋";
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 14px;
  color: var(--accent);
}

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

.faq-question:hover {
  color: var(--accent);
}

.faq-answer {
  padding: 0 18px 16px 42px;
  font-size: 14.5px;
  line-height: 1.9;
  color: var(--ink-soft);
}

/* --------------------------------------------------------------------------
   9. pages — 404
   -------------------------------------------------------------------------- */

.site-error .error-main {
  max-width: var(--wrap-narrow);
  margin: 0 auto;
  padding: 72px var(--gutter) 64px;
}

.error-panel {
  padding: 34px 32px 30px;
  border: 1px solid var(--rule);
  border-radius: var(--radius);
  background: var(--card);
}

.error-code {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.12em;
  color: var(--accent);
}

.error-panel h1 {
  margin-top: 12px;
  font-size: 30px;
  line-height: 1.35;
}

.error-text {
  margin-top: 14px;
  font-size: 15px;
  line-height: 1.9;
  color: var(--ink-soft);
}

.error-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
  margin-top: 24px;
}

.error-links {
  margin-top: 40px;
}

.error-links h2 {
  padding-top: 18px;
  border-top: 1px solid var(--rule);
  font-size: 20px;
}

.error-link-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 12px;
  margin-top: 18px;
}

.error-link-list li {
  border: 1px solid var(--rule);
  border-radius: var(--radius);
  background: var(--card);
}

.error-link-list a {
  display: block;
  padding: 13px 16px;
  font-size: 14.5px;
  color: var(--ink);
}

.error-link-list a:hover,
.error-link-list a:focus-visible {
  color: var(--accent);
}

/* --------------------------------------------------------------------------
   10. responsive — 960px / 640px 两级断点
   -------------------------------------------------------------------------- */

@media (max-width: 960px) {
  :root {
    --gutter: 22px;
  }

  .nav-toggle {
    display: flex;
  }

  .site-nav {
    position: absolute;
    left: 0;
    right: 0;
    top: 100%;
    background: var(--card);
    border-bottom: 1px solid var(--rule);
  }

  .nav-list {
    display: none;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 8px var(--gutter) 16px;
  }

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

  .nav-item {
    border-bottom: 1px solid var(--rule-soft);
  }

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

  .nav-link {
    display: flex;
    align-items: center;
    min-height: 48px;
    font-size: 16px;
    border-bottom: 0;
  }

  .nav-link.is-current {
    border-bottom: 0;
  }

  .hero-inner {
    grid-template-columns: minmax(0, 1fr);
    gap: 30px;
    padding-top: 40px;
    padding-bottom: 40px;
  }

  .hero-title {
    font-size: 31px;
  }

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

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

  .section-channel-basis .basis-grid,
  .types-grid,
  .prepare-groups {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-layout,
  .sidebar-left .page-layout,
  .page-layout.sidebar-left {
    grid-template-columns: minmax(0, 1fr);
    gap: 26px;
  }

  .records-index {
    position: static;
  }

  .month-list {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
  }

  .month-list li + li {
    margin-top: 0;
  }

  .month-item a {
    padding: 8px 12px;
    border: 1px solid var(--rule);
    border-radius: var(--radius);
  }

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

@media (max-width: 640px) {
  :root {
    --gutter: 16px;
    --header-h: 68px;
  }

  body {
    font-size: 15.5px;
  }

  .topbar-text {
    font-size: 12px;
    line-height: 1.7;
  }

  .brand-name {
    font-size: 19px;
  }

  .brand-slogan {
    font-size: 11.5px;
  }

  .hero-inner {
    padding-top: 30px;
    padding-bottom: 32px;
  }

  .hero-title {
    font-size: 26px;
  }

  .hero-lead {
    font-size: 15px;
  }

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

  .section {
    padding-top: 38px;
  }

  .inner-main {
    padding-top: 20px;
    padding-bottom: 48px;
  }

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

  .section-title,
  .inner-main .section-title,
  .guide-section .section-title,
  .records-section .section-title,
  .types-section .section-title,
  .scope-section .section-title,
  .related-section .section-title {
    font-size: 20px;
  }

  .page-header {
    margin-bottom: 26px;
    padding-bottom: 18px;
  }

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

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

  .special-grid,
  .special-cards,
  .boundary-columns,
  .prepare-groups,
  .types-grid,
  .section-channel-basis .basis-grid {
    grid-template-columns: minmax(0, 1fr);
  }

  .index-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 14px;
  }

  .index-col {
    padding: 15px 16px;
  }

  .record-item {
    grid-template-columns: minmax(0, 1fr);
    gap: 6px;
    padding: 14px 0;
  }

  .record-type {
    justify-self: start;
  }

  .record-group {
    padding: 16px 16px 4px;
  }

  .advice-item,
  .basis-item,
  .type-card,
  .prepare-item,
  .boundary-col,
  .inclusion-item {
    padding: 16px 16px;
  }

  .inclusion-item {
    padding-left: 50px;
  }

  .inclusion-item::before {
    left: 16px;
  }

  .faq-question {
    font-size: 15.5px;
    padding: 14px 16px;
  }

  .faq-answer {
    padding: 0 16px 14px 38px;
  }

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

  .relation-table,
  .scope-table,
  .field-table {
    min-width: 0;
  }

  .relation-table tbody th {
    white-space: normal;
  }

  .footer-inner {
    grid-template-columns: minmax(0, 1fr);
    gap: 24px;
    padding: 34px var(--gutter) 26px;
  }

  .site-error .error-main {
    padding: 46px var(--gutter) 48px;
  }

  .error-panel {
    padding: 26px 20px 24px;
  }

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

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

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

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