/* ==========================================================================
   日本午夜影院 biweixin.cn 全站样式
   分组：base / layout / components / pages / responsive
   ========================================================================== */

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

:root {
  --color-primary: #1f3a5f;
  --color-accent: #2f7a6b;
  --color-warn: #b4552d;
  --color-bg: #f7f8f6;
  --color-surface: #ffffff;
  --color-text: #2b2b2b;
  --color-muted: #5c6660;
  --color-line: #d8dcd8;
  --color-line-soft: #e8ebe7;
  --radius: 6px;
  --radius-sm: 4px;
  --shell-max: 1120px;
  --body-max: 720px;
  --gap-lg: 48px;
  --gap-md: 28px;
  --gap-sm: 16px;
  --font-sans: "Source Han Sans SC", "Noto Sans SC", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", system-ui, -apple-system,
    "Segoe UI", Arial, sans-serif;
}

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

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

body {
  margin: 0;
  background: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.8;
  text-align: left;
}

h1,
h2,
h3,
h4 {
  margin: 0;
  color: var(--color-primary);
  font-weight: 700;
  line-height: 1.4;
}

p {
  margin: 0;
}

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

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

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

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

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

figure {
  margin: 0;
}

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

th,
td {
  text-align: left;
  font-weight: 400;
}

button {
  font: inherit;
  color: inherit;
}

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

.skip-link {
  position: absolute;
  left: 12px;
  top: -60px;
  z-index: 60;
  padding: 8px 14px;
  background: var(--color-primary);
  color: #fff;
  border-radius: var(--radius-sm);
  transition: top 0.15s ease-in-out;
}

.skip-link:focus {
  top: 12px;
  color: #fff;
  text-decoration: none;
}

/* --------------------------------------------------------------------------
   layout —— 全站骨架
   -------------------------------------------------------------------------- */

.site-body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

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

.header-inner {
  width: 100%;
  max-width: var(--shell-max);
  margin: 0 auto;
  padding: 14px 24px;
  display: flex;
  align-items: center;
  gap: var(--gap-md);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--color-primary);
  font-weight: 700;
}

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

.brand-mark {
  width: 26px;
  height: 26px;
  border-radius: var(--radius-sm);
  background: var(--color-primary);
  position: relative;
  flex: none;
}

.brand-mark::after {
  content: "";
  position: absolute;
  left: 7px;
  top: 7px;
  width: 12px;
  height: 12px;
  border: 2px solid #f7f8f6;
  border-radius: 2px;
}

.brand-text {
  font-size: 18px;
  line-height: 1.2;
  white-space: nowrap;
}

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

.nav-list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 4px 20px;
}

.nav-link {
  display: inline-block;
  padding: 6px 2px;
  color: var(--color-primary);
  font-size: 15px;
  line-height: 1.6;
  border-bottom: 2px solid transparent;
}

.nav-link:hover,
.nav-link:focus-visible {
  color: var(--color-accent);
  text-decoration: none;
}

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

.nav-toggle {
  display: none;
  margin-left: auto;
  width: 44px;
  height: 44px;
  padding: 10px;
  background: transparent;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-sm);
  cursor: pointer;
  flex-direction: column;
  justify-content: space-between;
}

.nav-toggle-bar {
  display: block;
  width: 100%;
  height: 2px;
  background: var(--color-primary);
}

.site-main {
  flex: 1 0 auto;
  width: 100%;
}

.inner-main {
  max-width: var(--shell-max);
  margin: 0 auto;
  padding: 24px 24px 64px;
}

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  color: var(--color-muted);
  padding-bottom: 12px;
}

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

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

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

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

.page-header {
  max-width: var(--body-max);
  padding-bottom: var(--gap-md);
  border-bottom: 1px solid var(--color-line);
  margin-bottom: var(--gap-lg);
}

.page-title {
  font-size: 32px;
  line-height: 1.3;
  font-weight: 700;
  color: var(--color-primary);
}

.page-description {
  margin-top: 14px;
  color: var(--color-muted);
  font-size: 16px;
  line-height: 1.8;
}

.site-footer {
  background: var(--color-surface);
  border-top: 1px solid var(--color-line);
  margin-top: auto;
}

.footer-inner {
  width: 100%;
  max-width: var(--shell-max);
  margin: 0 auto;
  padding: 40px 24px 24px;
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1fr;
  gap: var(--gap-md);
}

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

.footer-brand-name {
  color: var(--color-primary);
  font-weight: 700;
  font-size: 17px;
  margin-bottom: 8px;
}

.footer-brand-desc {
  color: var(--color-muted);
  font-size: 14px;
  line-height: 1.8;
}

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

.footer-list li {
  margin-bottom: 6px;
}

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

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

.footer-copy {
  max-width: var(--shell-max);
  margin: 0 auto;
  padding: 16px 24px 28px;
  border-top: 1px solid var(--color-line-soft);
  color: var(--color-muted);
  font-size: 13px;
}

.footer-note {
  color: var(--color-muted);
  font-size: 13px;
  line-height: 1.8;
}

.back-to-top {
  display: inline-block;
  margin-top: 10px;
  padding: 6px 12px;
  font-size: 13px;
  color: var(--color-accent);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-sm);
  background: var(--color-bg);
}

.back-to-top:hover,
.back-to-top:focus-visible {
  color: var(--color-primary);
  border-color: var(--color-accent);
  text-decoration: none;
}

/* --------------------------------------------------------------------------
   components —— 通用组件
   -------------------------------------------------------------------------- */

.section-title {
  font-size: 22px;
  line-height: 1.4;
  color: var(--color-primary);
}

.section-head {
  max-width: var(--body-max);
  margin-bottom: var(--gap-md);
}

.section-desc,
.section-lead,
.section-intro,
.section-text {
  margin-top: 12px;
  color: var(--color-muted);
  font-size: 16px;
  line-height: 1.8;
}

.section-foot {
  margin-top: var(--gap-md);
  font-size: 15px;
}

.text-link {
  display: inline-block;
  padding: 4px 0;
  color: var(--color-accent);
  font-weight: 700;
  border-bottom: 1px solid currentColor;
}

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

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 10px 22px;
  border-radius: var(--radius);
  font-size: 16px;
  font-weight: 700;
  border: 1px solid transparent;
  transition: background-color 0.15s ease-in-out, color 0.15s ease-in-out,
    border-color 0.15s ease-in-out;
}

.btn-primary,
a.btn-primary {
  background: var(--color-primary);
  border-color: var(--color-primary);
  color: #fff;
}

.btn-primary:hover,
.btn-primary:focus-visible,
a.btn-primary:hover,
a.btn-primary:focus-visible {
  background: var(--color-accent);
  border-color: var(--color-accent);
  color: #fff;
  text-decoration: none;
}

.btn-ghost,
a.btn-ghost {
  background: transparent;
  border-color: var(--color-primary);
  color: var(--color-primary);
}

.btn-ghost:hover,
.btn-ghost:focus-visible,
a.btn-ghost:hover,
a.btn-ghost:focus-visible {
  background: var(--color-primary);
  color: #fff;
  text-decoration: none;
}

.channel-link,
.channel-enter,
.playlist-link,
.guide-entry-link {
  display: inline-block;
  padding: 4px 0;
  color: var(--color-accent);
  font-weight: 700;
  font-size: 15px;
  border-bottom: 1px solid currentColor;
}

.channel-link:hover,
.channel-link:focus-visible,
.channel-enter:hover,
.channel-enter:focus-visible,
.playlist-link:hover,
.playlist-link:focus-visible,
.guide-entry-link:hover,
.guide-entry-link:focus-visible {
  color: var(--color-primary);
  text-decoration: none;
}

.playlist-tag {
  display: inline-block;
  padding: 2px 10px;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-sm);
  color: var(--color-accent);
  font-size: 13px;
  line-height: 1.7;
}

/* 表格通用 */

.data-table,
.pair-table,
.fields-table {
  width: 100%;
  font-size: 14px;
  line-height: 1.6;
  background: var(--color-surface);
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
}

.data-table th,
.data-table td,
.pair-table th,
.pair-table td,
.fields-table th,
.fields-table td {
  padding: 12px 14px;
  border-bottom: 1px solid var(--color-line-soft);
  vertical-align: top;
  word-break: break-word;
}

.data-table thead th,
.pair-table thead th,
.fields-table thead th {
  background: var(--color-bg);
  color: var(--color-primary);
  font-weight: 700;
  border-bottom: 1px solid var(--color-line);
}

.data-table tbody th,
.pair-table tbody th,
.fields-table tbody th {
  color: var(--color-primary);
  font-weight: 700;
  width: 34%;
}

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

.fields-table-caption {
  padding: 12px 14px;
  text-align: left;
  color: var(--color-muted);
  font-size: 14px;
  border-bottom: 1px solid var(--color-line-soft);
}

/* 步骤清单（首页 / 边界页共用结构） */

.step-list {
  display: grid;
  gap: var(--gap-sm);
}

.step-item {
  display: grid;
  grid-template-columns: 48px 1fr;
  gap: var(--gap-sm);
  align-items: start;
  padding: 18px 20px;
  background: var(--color-surface);
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
}

.step-index {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: var(--color-primary);
  color: #fff;
  font-size: 15px;
  font-weight: 700;
  flex: none;
}

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

.step-name {
  font-size: 17px;
  color: var(--color-primary);
}

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

/* 编号清单（专题片单页 / 字段页更正路径） */

.order-list,
.correction-steps {
  display: grid;
  gap: var(--gap-sm);
}

.order-step,
.correction-step {
  display: grid;
  grid-template-columns: 48px 1fr;
  gap: var(--gap-sm);
  align-items: start;
  padding: 16px 18px;
  background: var(--color-surface);
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
}

.order-index {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 34px;
  height: 34px;
  border-radius: 50%;
  background: var(--color-accent);
  color: #fff;
  font-size: 15px;
  font-weight: 700;
  flex: none;
}

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

.order-name {
  font-size: 17px;
  color: var(--color-primary);
}

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

.correction-step .step-index {
  width: 34px;
  height: 34px;
  background: var(--color-warn);
}

.correction-step .step-title {
  font-size: 17px;
  color: var(--color-primary);
}

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

/* 站内入口列表（查阅路径页 / 边界页） */

.entry-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: var(--gap-sm);
}

.entry-item {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 14px 16px;
  background: var(--color-surface);
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
}

.entry-item a {
  font-weight: 700;
  color: var(--color-accent);
}

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

.entry-note {
  color: var(--color-muted);
  font-size: 14px;
}

/* 图片容器 */

.hero-media,
.playlist-media,
.channel-media,
.media-figure,
.guide-figure,
.scope-figure {
  overflow: hidden;
  border-radius: var(--radius);
  background: var(--color-line-soft);
}

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

.hero-media figcaption,
.media-figure figcaption,
.guide-figure figcaption,
.scope-figure figcaption,
.figure-caption {
  margin-top: 8px;
  color: var(--color-muted);
  font-size: 13px;
  line-height: 1.7;
}

/* --------------------------------------------------------------------------
   pages —— 首页
   -------------------------------------------------------------------------- */

.home-main {
  padding-bottom: 64px;
}

/* 首屏定位区 */

.hero {
  border-bottom: 1px solid var(--color-line);
}

.hero-inner {
  max-width: var(--shell-max);
  margin: 0 auto;
  padding: 56px 24px 48px;
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: var(--gap-lg);
  align-items: center;
}

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

.hero-kicker {
  color: var(--color-accent);
  font-size: 14px;
  font-weight: 700;
  margin-bottom: 12px;
}

.hero-title {
  font-size: 32px;
  line-height: 1.3;
  color: var(--color-primary);
}

.hero-lead {
  margin-top: 16px;
  max-width: 520px;
  color: var(--color-muted);
  font-size: 16px;
  line-height: 1.8;
}

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

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

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

/* 题材频道方向总览 */

.channel-overview,
.playlist-overview,
.fields-table,
.guide-steps,
.boundary-entry {
  max-width: var(--shell-max);
  margin: 0 auto;
  padding: 48px 24px 0;
}

.channel-list {
  display: grid;
  gap: 10px;
}

.channel-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: var(--gap-md);
  align-items: center;
  padding: 18px 20px;
  background: var(--color-surface);
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  transition: background-color 0.15s ease-in-out;
}

.channel-row:hover {
  background: #f1f4f0;
}

.channel-row-main {
  min-width: 0;
}

.channel-name {
  font-size: 18px;
  color: var(--color-primary);
}

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

.channel-meta {
  margin-top: 4px;
  color: var(--color-muted);
  font-size: 14px;
}

/* 本期专题片单速览 */

.playlist-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--gap-md);
}

.playlist-card {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 16px;
  background: var(--color-surface);
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  transition: background-color 0.15s ease-in-out;
}

.playlist-card:hover {
  background: #f1f4f0;
}

.playlist-card .playlist-media {
  aspect-ratio: 16 / 10;
  margin-bottom: 6px;
}

.playlist-name {
  font-size: 18px;
  color: var(--color-primary);
}

.playlist-scope {
  color: var(--color-text);
  font-size: 15px;
}

.playlist-card .playlist-tag {
  align-self: flex-start;
}

.playlist-card .playlist-link {
  margin-top: auto;
  align-self: flex-start;
}

/* 条目字段与收录边界摘要 */

.fields-table .data-table {
  margin-top: 4px;
}

/* 收录边界与站内反馈入口 */

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

.boundary-block {
  padding: 20px;
  background: var(--color-surface);
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
}

.boundary-block:first-child {
  border-left: 3px solid var(--color-warn);
}

.boundary-name {
  font-size: 17px;
  color: var(--color-primary);
}

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

/* --------------------------------------------------------------------------
   pages —— 内页：题材频道
   -------------------------------------------------------------------------- */

.channel-groups,
.channel-to-playlist,
.guide-entry,
.playlist-items,
.playlist-mapping,
.playlist-order,
.fields-visual,
.fields-table-section,
.fields-rules,
.correction-path,
.fields-guide-link,
.guide-steps,
.branch-path,
.channel-entry,
.boundary-section {
  max-width: var(--shell-max);
  margin: 0 auto;
  padding: 0 0 var(--gap-lg);
}

.channel-groups .section-lead,
.channel-to-playlist .section-lead,
.guide-entry .section-title,
.playlist-items h2,
.playlist-mapping h2,
.playlist-order h2,
.fields-visual .section-title,
.fields-table-section .section-title,
.fields-rules .section-title,
.correction-path .section-title,
.fields-guide-link .section-title,
.guide-steps .section-title,
.branch-path .section-title,
.channel-entry .section-title,
.boundary-section .section-title {
  margin-bottom: 0;
}

.channel-groups .section-title,
.channel-to-playlist .section-title,
.guide-entry .section-title,
.playlist-items h2,
.playlist-mapping h2,
.playlist-order h2,
.fields-visual .section-title,
.fields-table-section .section-title,
.fields-rules .section-title,
.correction-path .section-title,
.fields-guide-link .section-title,
.guide-steps .section-title,
.branch-path .section-title,
.channel-entry .section-title,
.boundary-section .section-title {
  font-size: 22px;
  line-height: 1.4;
  color: var(--color-primary);
}

.channel-item {
  display: grid;
  grid-template-columns: 240px minmax(0, 1fr);
  gap: var(--gap-md);
  align-items: start;
  padding: 20px;
  background: var(--color-surface);
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  margin-top: var(--gap-sm);
}

.channel-item .channel-media {
  aspect-ratio: 4 / 3;
}

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

.channel-body .channel-name {
  font-size: 19px;
  color: var(--color-primary);
}

.channel-body .channel-desc {
  margin-top: 8px;
  color: var(--color-text);
  font-size: 15px;
}

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

.channel-body .channel-enter {
  margin-top: 12px;
}

.channel-to-playlist .pair-table {
  margin-top: var(--gap-sm);
}

.channel-to-playlist .section-foot {
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
}

.guide-entry-box {
  margin-top: var(--gap-sm);
  padding: 22px;
  background: var(--color-surface);
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
}

.guide-entry-text {
  color: var(--color-muted);
  font-size: 15px;
}

.guide-entry-link {
  margin-top: 12px;
}

/* --------------------------------------------------------------------------
   pages —— 内页：专题片单
   -------------------------------------------------------------------------- */

.playlist-item {
  display: grid;
  grid-template-columns: 260px minmax(0, 1fr);
  gap: var(--gap-md);
  align-items: start;
  padding: 20px;
  background: var(--color-surface);
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  margin-top: var(--gap-sm);
}

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

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

.playlist-body .playlist-name {
  font-size: 19px;
  color: var(--color-primary);
}

.playlist-body .playlist-tag {
  margin-top: 8px;
}

.playlist-body .playlist-scope {
  margin-top: 10px;
  color: var(--color-text);
  font-size: 15px;
}

.playlist-body .playlist-reason {
  margin-top: 8px;
  color: var(--color-muted);
  font-size: 15px;
}

.playlist-body .playlist-link {
  margin-top: 12px;
}

.playlist-mapping .mapping-intro {
  margin-top: 12px;
  color: var(--color-muted);
  font-size: 16px;
}

.mapping-list {
  margin-top: var(--gap-sm);
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  background: var(--color-surface);
  overflow: hidden;
}

.mapping-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: var(--gap-md);
  padding: 12px 16px;
  border-bottom: 1px solid var(--color-line-soft);
  font-size: 14px;
}

.mapping-row:last-child {
  border-bottom: 0;
}

.mapping-key {
  color: var(--color-primary);
  font-weight: 700;
}

.mapping-value {
  color: var(--color-muted);
}

.mapping-note {
  margin-top: 14px;
  color: var(--color-muted);
  font-size: 14px;
}

.playlist-order .order-list {
  margin-top: var(--gap-sm);
}

.order-note {
  margin-top: var(--gap-sm);
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
  color: var(--color-muted);
  font-size: 14px;
}

/* --------------------------------------------------------------------------
   pages —— 内页：条目字段说明
   -------------------------------------------------------------------------- */

.fields-visual .section-text,
.fields-table-section .section-text,
.fields-rules .section-text,
.correction-path .section-text,
.fields-guide-link .section-text {
  margin-top: 12px;
  color: var(--color-muted);
  font-size: 16px;
}

.fields-visual .media-figure {
  margin-top: var(--gap-sm);
  max-width: 640px;
}

.fields-visual .media-figure img {
  aspect-ratio: 16 / 9;
}

.fields-table-section .fields-table {
  margin-top: var(--gap-sm);
}

.fields-table-section .fields-table tbody th {
  width: 26%;
}

.rules-list {
  margin-top: var(--gap-sm);
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: var(--gap-md);
}

.rules-item {
  padding: 18px 20px;
  background: var(--color-surface);
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
}

.rules-title {
  font-size: 17px;
  color: var(--color-primary);
}

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

.correction-path .correction-steps {
  margin-top: var(--gap-sm);
}

.fields-guide-link .guide-link-body {
  margin-top: var(--gap-sm);
  padding: 20px;
  background: var(--color-surface);
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
}

.fields-guide-link .guide-link-body .section-text {
  margin-top: 0;
}

.fields-guide-link .related-links {
  margin-top: var(--gap-md);
}

.related-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 10px;
  margin-top: var(--gap-sm);
}

.related-item {
  padding: 12px 14px;
  background: var(--color-surface);
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
}

.related-item a {
  color: var(--color-accent);
  font-weight: 700;
  font-size: 15px;
}

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

/* --------------------------------------------------------------------------
   pages —— 内页：查阅路径
   -------------------------------------------------------------------------- */

.guide-steps .section-intro,
.branch-path .section-intro,
.channel-entry .section-intro {
  margin-top: 12px;
  color: var(--color-muted);
  font-size: 16px;
}

.guide-steps .step-list {
  margin-top: var(--gap-sm);
}

.guide-steps .step-item {
  grid-template-columns: 1fr;
}

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

.step-head .step-name {
  font-size: 18px;
  color: var(--color-primary);
}

.step-detail {
  margin: 12px 0 0;
  display: grid;
  grid-template-columns: 96px minmax(0, 1fr);
  gap: 6px 16px;
  font-size: 15px;
}

.step-detail dt {
  color: var(--color-primary);
  font-weight: 700;
}

.step-detail dd {
  margin: 0;
  color: var(--color-muted);
}

.guide-figure {
  max-width: var(--shell-max);
  margin: 0 auto var(--gap-lg);
  padding: 0 24px;
}

.guide-figure img {
  aspect-ratio: 16 / 9;
  max-height: 420px;
}

.branch-list {
  margin-top: var(--gap-sm);
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: var(--gap-md);
}

.branch-item {
  padding: 18px 20px;
  background: var(--color-surface);
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
}

.branch-name {
  font-size: 17px;
  color: var(--color-primary);
}

.branch-item p {
  margin-top: 8px;
  color: var(--color-muted);
  font-size: 15px;
}

.channel-entry .entry-list {
  margin-top: var(--gap-sm);
}

/* --------------------------------------------------------------------------
   pages —— 内页：收录边界与反馈
   -------------------------------------------------------------------------- */

.boundary-section {
  padding-bottom: var(--gap-lg);
}

.scope-body {
  margin-top: var(--gap-sm);
}

.scope-text {
  color: var(--color-text);
  font-size: 16px;
}

.scope-text + .scope-text {
  margin-top: 10px;
}

.scope-list {
  margin-top: 14px;
  display: grid;
  gap: 8px;
}

.scope-item {
  padding-left: 16px;
  position: relative;
  color: var(--color-muted);
  font-size: 15px;
}

.scope-item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 12px;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--color-accent);
}

.scope-figure {
  margin-top: var(--gap-md);
  max-width: 640px;
}

.scope-figure img {
  aspect-ratio: 16 / 9;
}

.excluded-list {
  margin-top: var(--gap-sm);
  display: grid;
  gap: 10px;
}

.excluded-item {
  padding: 16px 18px;
  background: var(--color-surface);
  border: 1px solid var(--color-line);
  border-left: 3px solid var(--color-warn);
  border-radius: var(--radius);
}

.excluded-name {
  font-size: 17px;
  color: var(--color-primary);
}

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

.maintenance-path .step-list {
  margin-top: var(--gap-sm);
}

.path-note {
  margin-top: var(--gap-sm);
  color: var(--color-muted);
  font-size: 14px;
}

.faq-list {
  margin-top: var(--gap-sm);
  display: grid;
  gap: 10px;
}

.faq-item {
  background: var(--color-surface);
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  padding: 4px 18px;
}

.faq-question {
  cursor: pointer;
  padding: 14px 0;
  font-size: 16px;
  font-weight: 700;
  color: var(--color-primary);
  list-style: none;
}

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

.faq-question::after {
  content: "+";
  float: right;
  margin-left: 12px;
  color: var(--color-accent);
  font-weight: 700;
}

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

.faq-answer {
  padding: 0 0 16px;
  color: var(--color-muted);
  font-size: 15px;
}

.faq-answer p + p {
  margin-top: 8px;
}

.related-entry .entry-list {
  margin-top: var(--gap-sm);
}

/* --------------------------------------------------------------------------
   pages —— 404
   -------------------------------------------------------------------------- */

.error-main {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 64px 24px;
}

.error-panel {
  width: 100%;
  max-width: 640px;
  padding: 32px;
  background: var(--color-surface);
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
}

.error-code {
  color: var(--color-warn);
  font-size: 15px;
  font-weight: 700;
  margin-bottom: 8px;
}

.error-panel h1 {
  font-size: 32px;
  line-height: 1.3;
  color: var(--color-primary);
}

.error-desc {
  margin-top: 14px;
  color: var(--color-muted);
  font-size: 16px;
}

.error-actions {
  margin-top: 22px;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.error-actions .btn-primary {
  min-height: 44px;
}

.error-note {
  margin-top: 18px;
  color: var(--color-muted);
  font-size: 14px;
}

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

@media (max-width: 960px) {
  .hero-inner {
    grid-template-columns: minmax(0, 1fr);
    gap: var(--gap-md);
    padding: 40px 24px 36px;
  }

  .hero-media {
    order: -1;
  }

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

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

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

@media (max-width: 768px) {
  .header-inner {
    flex-wrap: wrap;
    padding: 12px 18px;
    gap: 12px;
  }

  .nav-toggle {
    display: flex;
  }

  .site-nav {
    flex-basis: 100%;
    margin-left: 0;
  }

  .nav-list {
    display: none;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 8px 0 4px;
    border-top: 1px solid var(--color-line);
  }

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

  .nav-link {
    padding: 12px 2px;
    font-size: 16px;
    border-bottom: 0;
    border-left: 3px solid transparent;
    padding-left: 10px;
  }

  .nav-link.is-current {
    border-bottom: 0;
    border-left-color: var(--color-accent);
  }

  .inner-main {
    padding: 20px 18px 48px;
  }

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

  .section-title,
  .channel-groups .section-title,
  .channel-to-playlist .section-title,
  .guide-entry .section-title,
  .playlist-items h2,
  .playlist-mapping h2,
  .playlist-order h2,
  .fields-visual .section-title,
  .fields-table-section .section-title,
  .fields-rules .section-title,
  .correction-path .section-title,
  .fields-guide-link .section-title,
  .guide-steps .section-title,
  .branch-path .section-title,
  .channel-entry .section-title,
  .boundary-section .section-title {
    font-size: 20px;
  }

  .channel-overview,
  .playlist-overview,
  .fields-table,
  .guide-steps,
  .boundary-entry {
    padding: 36px 18px 0;
  }

  .channel-row {
    grid-template-columns: minmax(0, 1fr);
    gap: 10px;
  }

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

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

  .channel-item .channel-media,
  .playlist-item .playlist-media {
    max-width: 100%;
  }

  .data-table,
  .pair-table,
  .fields-table {
    font-size: 13px;
  }

  .data-table th,
  .data-table td,
  .pair-table th,
  .pair-table td,
  .fields-table th,
  .fields-table td {
    padding: 10px 10px;
  }

  .data-table tbody th,
  .pair-table tbody th,
  .fields-table tbody th,
  .fields-table-section .fields-table tbody th {
    width: auto;
  }

  .step-detail {
    grid-template-columns: minmax(0, 1fr);
    gap: 2px;
  }

  .step-detail dd {
    margin-bottom: 8px;
  }

  .mapping-row {
    grid-template-columns: minmax(0, 1fr);
    gap: 2px;
  }

  .guide-figure {
    padding: 0 18px;
  }

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

  .footer-copy {
    padding: 14px 18px 24px;
  }

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

@media (max-width: 480px) {
  body {
    font-size: 15px;
  }

  .brand-text {
    font-size: 16px;
  }

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

  .btn,
  .btn-primary,
  .btn-ghost {
    width: 100%;
  }

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

  .step-item,
  .order-step,
  .correction-step {
    grid-template-columns: minmax(0, 1fr);
  }

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