/* ==========================================================================
   飘花飘雪影院 · 全站样式表
   结构：base / layout / components / pages / responsive
   ========================================================================== */

/* --------------------------------------------------------------------------
   base · 变量与基础重置
   -------------------------------------------------------------------------- */
:root {
  --color-primary: #1B3A5C;
  --color-primary-soft: #2C5580;
  --color-accent: #E87A2C;
  --color-accent-dark: #C9621A;
  --color-bg: #F7F8FA;
  --color-surface: #FFFFFF;
  --color-text: #1F2933;
  --color-muted: #5A6570;
  --color-line: #DCE1E8;
  --color-line-soft: #E9EDF2;
  --radius-sm: 4px;
  --radius-md: 6px;
  --radius-lg: 8px;
  --container: 1200px;
  --shadow-card: 0 1px 2px rgba(27, 58, 92, 0.06), 0 8px 20px rgba(27, 58, 92, 0.06);
  --shadow-card-hover: 0 4px 10px rgba(27, 58, 92, 0.10), 0 14px 30px rgba(27, 58, 92, 0.10);
}

*,
*::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: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  font-size: 16px;
  font-weight: 400;
  line-height: 1.7;
}

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

p {
  margin: 0;
}

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

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

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

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%;
}

button {
  font: inherit;
}

/* --------------------------------------------------------------------------
   layout · 全站骨架：容器、页头、主导航、主区、页脚
   -------------------------------------------------------------------------- */
.site-body {
  display: flex;
  min-height: 100vh;
  flex-direction: column;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 40;
  background-color: var(--color-primary);
  border-bottom: 1px solid rgba(255, 255, 255, 0.10);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px;
  min-height: 68px;
}

.brand {
  display: inline-flex;
  align-items: center;
  flex: 0 0 auto;
  min-height: 44px;
  padding-right: 8px;
  color: #FFFFFF;
  font-size: 1.25rem;
  font-weight: 700;
  line-height: 1.2;
}

.brand:hover,
.brand:focus-visible {
  color: #FFD9BC;
}

.site-nav {
  display: block;
}

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

.nav-list li {
  display: block;
}

.nav-list a {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 0 14px;
  border-radius: var(--radius-sm);
  color: rgba(255, 255, 255, 0.88);
  font-size: 0.9375rem;
  font-weight: 500;
  white-space: nowrap;
}

.nav-list a:hover,
.nav-list a:focus-visible {
  background-color: rgba(255, 255, 255, 0.10);
  color: #FFFFFF;
}

.nav-list a.is-current {
  background-color: var(--color-accent);
  color: #FFFFFF;
}

.nav-list a.is-current:hover,
.nav-list a.is-current:focus-visible {
  background-color: var(--color-accent-dark);
  color: #FFFFFF;
}

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  padding: 0 10px;
  border: 1px solid rgba(255, 255, 255, 0.30);
  border-radius: var(--radius-sm);
  background-color: transparent;
  cursor: pointer;
}

.nav-toggle-bar {
  display: block;
  width: 100%;
  height: 2px;
  background-color: #FFFFFF;
}

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

.home-main {
  display: block;
}

.inner-main {
  display: block;
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px 72px;
}

/* 内页统一：面包屑 */
.breadcrumb {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  padding: 20px 0 0;
  color: var(--color-muted);
  font-size: 0.875rem;
}

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

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

.breadcrumb-sep {
  color: #A7B0BA;
}

.breadcrumb-current {
  color: var(--color-primary);
  font-weight: 500;
}

/* 内页统一：页面标题区 */
.page-header {
  padding: 20px 0 32px;
  border-bottom: 1px solid var(--color-line);
  margin-bottom: 40px;
}

.page-title {
  font-size: 2rem;
  font-weight: 700;
}

.page-description {
  margin-top: 12px;
  max-width: 78ch;
  color: var(--color-muted);
  font-size: 1rem;
}

/* 内页统一：区块标题 */
.section-title {
  font-size: 1.5rem;
}

.section-intro {
  margin-top: 10px;
  max-width: 78ch;
  color: var(--color-muted);
  font-size: 0.9375rem;
}

.inner-main > section {
  margin-bottom: 56px;
}

.inner-main > section:last-of-type {
  margin-bottom: 0;
}

/* 全站页脚 */
.site-footer {
  background-color: var(--color-primary);
  color: rgba(255, 255, 255, 0.78);
  font-size: 0.875rem;
}

.footer-inner {
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: 48px 24px 28px;
}

.footer-groups {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 32px 28px;
  padding-bottom: 32px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.14);
}

.footer-group-title {
  margin-bottom: 14px;
  color: #FFFFFF;
  font-size: 1rem;
  font-weight: 600;
}

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

.footer-links a {
  display: inline-block;
  min-height: 24px;
  color: rgba(255, 255, 255, 0.78);
}

.footer-links a:hover,
.footer-links a:focus-visible {
  color: #FFD9BC;
}

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

.footer-about {
  max-width: 78ch;
  color: rgba(255, 255, 255, 0.86);
}

.footer-copy {
  margin-top: 10px;
  color: rgba(255, 255, 255, 0.60);
}

/* --------------------------------------------------------------------------
   components · 通用按钮、链接、列表、表格、步骤、卡片
   -------------------------------------------------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  padding: 0 22px;
  border: 1px solid transparent;
  border-radius: var(--radius-md);
  font-size: 0.9375rem;
  font-weight: 600;
  white-space: nowrap;
  transition: background-color 0.18s ease, border-color 0.18s ease, color 0.18s ease;
}

.btn-primary {
  background-color: var(--color-accent);
  border-color: var(--color-accent);
  color: #FFFFFF;
}

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

.btn-ghost {
  background-color: transparent;
  border-color: rgba(27, 58, 92, 0.28);
  color: var(--color-primary);
}

.btn-ghost:hover,
.btn-ghost:focus-visible {
  border-color: var(--color-primary);
  background-color: rgba(27, 58, 92, 0.06);
  color: var(--color-primary);
}

.text-link {
  display: inline-flex;
  align-items: center;
  min-height: 32px;
  color: var(--color-accent);
  font-size: 0.9375rem;
  font-weight: 600;
}

.text-link::after {
  content: "→";
  margin-left: 6px;
  font-weight: 400;
}

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

/* 步骤清单（首页 / 频道页 / 指引页共用结构） */
.step-list {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 20px;
}

.step-item {
  display: grid;
  grid-template-columns: 44px minmax(0, 1fr);
  gap: 14px;
  align-items: start;
  padding: 22px;
  background-color: var(--color-surface);
  border: 1px solid var(--color-line-soft);
  border-radius: var(--radius-lg);
}

.step-index {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background-color: rgba(232, 122, 44, 0.12);
  color: var(--color-accent-dark);
  font-size: 1rem;
  font-weight: 700;
}

.step-title {
  font-size: 1.25rem;
}

.step-text,
.step-desc {
  margin-top: 8px;
  color: var(--color-muted);
  font-size: 0.9375rem;
}

.step-result {
  margin-top: 10px;
  padding-left: 12px;
  border-left: 3px solid var(--color-accent);
  color: var(--color-primary);
  font-size: 0.9375rem;
}

/* 收录边界列表（首页 / 频道页 / 字段页共用） */
.boundary-list {
  display: grid;
  gap: 12px;
}

.boundary-list li {
  position: relative;
  padding-left: 20px;
  color: var(--color-muted);
  font-size: 0.9375rem;
}

.boundary-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.68em;
  width: 8px;
  height: 8px;
  border-radius: 2px;
  background-color: var(--color-accent);
}

/* 表格基础（首页摘要表 / 字段页数据表） */
.fields-table,
.data-table {
  background-color: var(--color-surface);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.fields-table caption,
.data-table caption {
  padding: 14px 16px;
  color: var(--color-muted);
  font-size: 0.875rem;
  text-align: left;
}

.fields-table th,
.fields-table td,
.data-table th,
.data-table td {
  padding: 12px 16px;
  border-top: 1px solid var(--color-line-soft);
  font-size: 0.9375rem;
  text-align: left;
  vertical-align: top;
}

.fields-table thead th,
.data-table thead th {
  background-color: #EEF2F7;
  border-top: none;
  color: var(--color-primary);
  font-weight: 600;
  white-space: nowrap;
}

.fields-table tbody th,
.data-table tbody th {
  color: var(--color-primary);
  font-weight: 600;
  white-space: nowrap;
}

.fields-table tbody td,
.data-table tbody td {
  color: var(--color-muted);
}

/* 相关页面列表（频道页 / 字段页 / 指引页共用） */
.related-links {
  margin-top: 40px;
  padding: 24px;
  background-color: var(--color-surface);
  border: 1px solid var(--color-line-soft);
  border-radius: var(--radius-lg);
}

.related-title,
.related-links h2 {
  font-size: 1.25rem;
}

.related-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px 24px;
  margin-top: 16px;
}

.related-list li {
  min-width: 0;
}

.related-list a {
  display: inline-flex;
  align-items: center;
  min-height: 32px;
  font-size: 0.9375rem;
  font-weight: 500;
}

.related-item {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px;
  padding: 12px 0;
  border-bottom: 1px solid var(--color-line-soft);
}

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

.related-desc {
  color: var(--color-muted);
  font-size: 0.875rem;
}

/* 图片容器统一约束 */
.card-media,
.collection-media,
.hero-media,
.channel-visual,
.media-figure,
.guide-figure {
  overflow: hidden;
  border-radius: var(--radius-lg);
  background-color: #E4E9EF;
}

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

/* --------------------------------------------------------------------------
   pages · 首页
   -------------------------------------------------------------------------- */
.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
  align-items: center;
  gap: 48px;
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: 64px 24px 72px;
}

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

.hero-eyebrow {
  display: inline-block;
  margin-bottom: 16px;
  padding: 6px 12px;
  border-radius: var(--radius-sm);
  background-color: rgba(232, 122, 44, 0.12);
  color: var(--color-accent-dark);
  font-size: 0.8125rem;
  font-weight: 600;
}

.hero-title {
  font-size: 2.5rem;
  font-weight: 700;
}

.hero-lead {
  margin-top: 18px;
  max-width: 34em;
  color: var(--color-muted);
  font-size: 1.0625rem;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 28px;
}

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

.hero-media img {
  object-position: center;
}

.section {
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px;
}

.home-main > .section {
  margin-bottom: 64px;
}

.home-main > .section:last-of-type {
  margin-bottom: 72px;
}

.section-head {
  max-width: 78ch;
  margin-bottom: 28px;
}

.section-head h2 {
  font-size: 1.5rem;
}

.section-desc {
  margin-top: 10px;
  color: var(--color-muted);
  font-size: 0.9375rem;
}

.section-more {
  margin-top: 20px;
}

/* 频道方向总览：行列表 */
.channel-rows {
  display: grid;
  gap: 10px;
}

.channel-row {
  display: grid;
  grid-template-columns: minmax(140px, 0.9fr) minmax(180px, 1.4fr) minmax(200px, 1.5fr) minmax(160px, 1.1fr);
  gap: 18px;
  align-items: start;
  padding: 18px 20px;
  background-color: var(--color-surface);
  border: 1px solid var(--color-line-soft);
  border-radius: var(--radius-md);
  transition: border-color 0.18s ease, box-shadow 0.18s ease, transform 0.18s ease;
}

.channel-row:hover {
  border-color: rgba(232, 122, 44, 0.55);
  box-shadow: var(--shadow-card);
  transform: translateY(-1px);
}

.channel-name {
  color: var(--color-primary);
  font-size: 1.0625rem;
  font-weight: 600;
}

.channel-tone,
.channel-scope,
.channel-audience {
  color: var(--color-muted);
  font-size: 0.9375rem;
  min-width: 0;
}

/* 专题片单速览 */
.collection-cards {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 22px;
}

.collection-card {
  display: flex;
  flex-direction: column;
  background-color: var(--color-surface);
  border: 1px solid var(--color-line-soft);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: transform 0.18s ease, box-shadow 0.18s ease, border-color 0.18s ease;
}

.collection-card:hover {
  transform: translateY(-3px);
  border-color: rgba(27, 58, 92, 0.20);
  box-shadow: var(--shadow-card-hover);
}

.collection-card .card-media {
  aspect-ratio: 16 / 10;
  border-radius: 0;
}

.collection-card .card-title {
  padding: 18px 20px 0;
  font-size: 1.25rem;
}

.collection-card .card-scope,
.collection-card .card-basis,
.collection-card .card-meta {
  padding: 0 20px;
  color: var(--color-muted);
  font-size: 0.9375rem;
}

.collection-card .card-scope {
  margin-top: 10px;
}

.collection-card .card-basis {
  margin-top: 8px;
}

.collection-card .card-meta {
  margin-top: 12px;
  padding-bottom: 20px;
  color: var(--color-primary);
  font-size: 0.875rem;
  font-weight: 500;
}

/* 条目字段与收录边界摘要 */
.fields-layout {
  display: grid;
  grid-template-columns: minmax(0, 1.55fr) minmax(0, 1fr);
  gap: 32px;
  align-items: start;
}

.fields-table-wrap {
  min-width: 0;
  overflow-x: auto;
}

.fields-boundary {
  padding: 24px;
  background-color: var(--color-surface);
  border: 1px solid var(--color-line-soft);
  border-radius: var(--radius-lg);
}

.fields-boundary h3 {
  font-size: 1.25rem;
  margin-bottom: 14px;
}

/* 查阅路径三步概览 */
.guide-preview .step-list {
  align-items: stretch;
}

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

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

.index-col {
  padding: 22px;
  background-color: var(--color-surface);
  border: 1px solid var(--color-line-soft);
  border-radius: var(--radius-lg);
  min-width: 0;
}

.index-col-title {
  font-size: 1.125rem;
}

.index-col-title a {
  color: var(--color-primary);
}

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

.index-col-text {
  margin-top: 10px;
  color: var(--color-muted);
  font-size: 0.9375rem;
}

/* --------------------------------------------------------------------------
   pages · 频道分类页
   -------------------------------------------------------------------------- */
.channels-list {
  min-width: 0;
}

.channel-row-list {
  display: grid;
  gap: 14px;
  margin-top: 24px;
}

.channel-row-list .channel-row {
  display: block;
  padding: 22px 24px;
}

.channel-row-list .channel-name {
  font-size: 1.25rem;
}

.channel-row-list .channel-name a {
  color: var(--color-primary);
}

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

.channel-meta {
  display: grid;
  grid-template-columns: minmax(96px, 140px) minmax(0, 1fr);
  gap: 6px 18px;
  margin: 14px 0 0;
}

.channel-meta dt {
  color: var(--color-primary);
  font-size: 0.875rem;
  font-weight: 600;
}

.channel-meta dd {
  margin: 0;
  color: var(--color-muted);
  font-size: 0.9375rem;
  min-width: 0;
}

.channel-visual {
  margin-top: 28px;
}

.channel-visual img {
  aspect-ratio: 21 / 9;
}

.channel-visual figcaption {
  padding: 12px 2px 0;
  color: var(--color-muted);
  font-size: 0.875rem;
}

/* 频道收录边界 */
.boundaries .boundary-list {
  margin-top: 24px;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
}

.boundary-item {
  padding: 22px;
  background-color: var(--color-surface);
  border: 1px solid var(--color-line-soft);
  border-radius: var(--radius-lg);
  min-width: 0;
}

.boundary-item h3 {
  font-size: 1.125rem;
}

.boundary-item p {
  margin-top: 10px;
  color: var(--color-muted);
  font-size: 0.9375rem;
}

.boundaries .boundary-list li {
  padding-left: 0;
}

.boundaries .boundary-list li::before {
  content: none;
}

/* 频道查阅路径 */
.path .step-list {
  margin-top: 24px;
}

/* --------------------------------------------------------------------------
   pages · 专题片单页
   -------------------------------------------------------------------------- */
.collections-list {
  min-width: 0;
}

.collections-list .collection-card {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.6fr);
  align-items: stretch;
  margin-top: 20px;
}

.collections-list .collection-card:first-of-type {
  margin-top: 24px;
}

.collections-list .collection-media {
  border-radius: 0;
  background-color: #E4E9EF;
}

.collections-list .collection-media img {
  height: 100%;
  aspect-ratio: 4 / 3;
}

.collection-body {
  padding: 24px;
  min-width: 0;
}

.collection-name {
  font-size: 1.25rem;
}

.collection-scope,
.collection-basis,
.collection-count {
  margin-top: 10px;
  color: var(--color-muted);
  font-size: 0.9375rem;
}

.collection-count {
  color: var(--color-primary);
  font-weight: 500;
}

.label {
  display: inline-block;
  margin-right: 8px;
  padding: 1px 8px;
  border-radius: var(--radius-sm);
  background-color: #EEF2F7;
  color: var(--color-primary);
  font-size: 0.8125rem;
  font-weight: 600;
}

/* 片单适用场景 */
.scenario-list {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 20px;
  margin-top: 24px;
}

.scenario-item {
  padding: 22px;
  background-color: var(--color-surface);
  border: 1px solid var(--color-line-soft);
  border-radius: var(--radius-lg);
  min-width: 0;
}

.scenario-title {
  font-size: 1.125rem;
}

.scenario-text {
  margin-top: 10px;
  color: var(--color-muted);
  font-size: 0.9375rem;
}

/* 片单查阅路径 */
.path-steps {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 20px;
  margin-top: 24px;
}

.path-step {
  display: grid;
  grid-template-columns: 44px minmax(0, 1fr);
  gap: 14px;
  align-items: start;
  padding: 22px;
  background-color: var(--color-surface);
  border: 1px solid var(--color-line-soft);
  border-radius: var(--radius-lg);
  min-width: 0;
}

.path-step .step-number {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background-color: rgba(232, 122, 44, 0.12);
  color: var(--color-accent-dark);
  font-size: 1rem;
  font-weight: 700;
}

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

.path-step .step-title {
  font-size: 1.125rem;
}

.path-step .step-text {
  margin-top: 8px;
  color: var(--color-muted);
  font-size: 0.9375rem;
}

/* --------------------------------------------------------------------------
   pages · 条目字段说明页
   -------------------------------------------------------------------------- */
.fields-table {
  margin-top: 24px;
}

.fields-table-wrap {
  overflow-x: auto;
}

.fields-figure {
  margin-top: 0;
}

.media-figure {
  margin-top: 24px;
}

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

.media-figure figcaption {
  padding: 12px 2px 0;
  color: var(--color-muted);
  font-size: 0.875rem;
}

.examples .example-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 22px;
  margin-top: 24px;
}

.example-item {
  padding: 24px;
  background-color: var(--color-surface);
  border: 1px solid var(--color-line-soft);
  border-radius: var(--radius-lg);
  min-width: 0;
}

.example-item h3 {
  font-size: 1.125rem;
}

.field-preview {
  display: grid;
  grid-template-columns: minmax(84px, 120px) minmax(0, 1fr);
  gap: 6px 16px;
  margin: 16px 0 0;
  padding-top: 16px;
  border-top: 1px solid var(--color-line-soft);
}

.field-preview dt {
  color: var(--color-primary);
  font-size: 0.875rem;
  font-weight: 600;
}

.field-preview dd {
  margin: 0;
  color: var(--color-muted);
  font-size: 0.9375rem;
  min-width: 0;
}

.example-note {
  margin-top: 16px;
  padding-left: 12px;
  border-left: 3px solid var(--color-accent);
  color: var(--color-primary);
  font-size: 0.875rem;
}

.fields .related-links,
.related-links {
  margin-top: 0;
}

.fields .related-list {
  margin-top: 20px;
}

.fields .related-item {
  display: block;
  padding: 14px 0;
}

.fields .related-item a {
  font-weight: 600;
}

/* --------------------------------------------------------------------------
   pages · 查阅路径指引页
   -------------------------------------------------------------------------- */
.guide-steps .guide-figure {
  margin-top: 24px;
}

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

.guide-figure figcaption {
  padding: 12px 2px 0;
  color: var(--color-muted);
  font-size: 0.875rem;
}

.guide-steps .step-list {
  margin-top: 24px;
}

.guide-steps .step-item {
  grid-template-columns: 44px minmax(0, 1fr);
}

.guide-steps .step-title {
  font-size: 1.125rem;
}

.guide-back {
  margin-top: 22px;
}

.guide-back a {
  display: inline-flex;
  align-items: center;
  min-height: 32px;
  color: var(--color-accent);
  font-size: 0.9375rem;
  font-weight: 600;
}

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

/* 频道与片单的使用方式 */
.usage-columns {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 22px;
  margin-top: 24px;
}

.usage-item {
  padding: 24px;
  background-color: var(--color-surface);
  border: 1px solid var(--color-line-soft);
  border-radius: var(--radius-lg);
  min-width: 0;
}

.usage-title {
  font-size: 1.125rem;
}

.usage-desc {
  margin-top: 10px;
  color: var(--color-muted);
  font-size: 0.9375rem;
}

.usage-points {
  margin-top: 14px;
  display: grid;
  gap: 8px;
}

.usage-points li {
  position: relative;
  padding-left: 18px;
  color: var(--color-muted);
  font-size: 0.9375rem;
}

.usage-points li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.68em;
  width: 7px;
  height: 7px;
  border-radius: 2px;
  background-color: var(--color-primary-soft);
}

.usage-note {
  margin-top: 20px;
  padding: 16px 18px;
  background-color: #EEF2F7;
  border-radius: var(--radius-md);
  color: var(--color-primary);
  font-size: 0.9375rem;
}

/* 常见查阅问题 */
.guide-faq details.faq-item {
  margin-top: 14px;
  background-color: var(--color-surface);
  border: 1px solid var(--color-line-soft);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.guide-faq details.faq-item:first-of-type {
  margin-top: 24px;
}

.faq-question {
  position: relative;
  padding: 18px 52px 18px 20px;
  color: var(--color-primary);
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  list-style: none;
}

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

.faq-question::after {
  content: "+";
  position: absolute;
  right: 20px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--color-accent);
  font-size: 1.375rem;
  font-weight: 400;
  line-height: 1;
}

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

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

.faq-answer {
  padding: 0 20px 20px;
  color: var(--color-muted);
  font-size: 0.9375rem;
}

.faq-answer p {
  margin: 0;
}

.guide-related .related-list {
  margin-top: 24px;
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

/* --------------------------------------------------------------------------
   pages · 404
   -------------------------------------------------------------------------- */
.error-main {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 72px 24px 88px;
}

.error-panel {
  width: 100%;
  max-width: 640px;
  padding: 40px;
  background-color: var(--color-surface);
  border: 1px solid var(--color-line-soft);
  border-radius: var(--radius-lg);
  text-align: left;
}

.error-code {
  color: var(--color-accent);
  font-size: 2.5rem;
  font-weight: 700;
  line-height: 1;
}

.error-title {
  margin-top: 14px;
  font-size: 2rem;
}

.error-text {
  margin-top: 14px;
  color: var(--color-muted);
  font-size: 1rem;
}

.error-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 26px;
}

.error-links {
  display: grid;
  gap: 10px;
  margin-top: 28px;
  padding-top: 22px;
  border-top: 1px solid var(--color-line-soft);
}

.error-links a {
  display: inline-flex;
  align-items: center;
  min-height: 32px;
  font-size: 0.9375rem;
  font-weight: 500;
}

/* --------------------------------------------------------------------------
   responsive · 平板与手机
   -------------------------------------------------------------------------- */
@media (max-width: 1024px) {
  .hero {
    grid-template-columns: minmax(0, 1fr);
    gap: 32px;
    padding-top: 48px;
    padding-bottom: 56px;
  }

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

  .channel-row {
    grid-template-columns: minmax(120px, 0.9fr) minmax(0, 1.4fr) minmax(0, 1.5fr);
  }

  .channel-audience {
    grid-column: 2 / -1;
  }

  .fields-layout {
    grid-template-columns: minmax(0, 1fr);
    gap: 24px;
  }

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

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

  .step-list,
  .path-steps,
  .scenario-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

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

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

  .nav-toggle {
    display: flex;
  }

  .site-nav {
    flex: 1 1 100%;
  }

  .nav-list {
    display: none;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    width: 100%;
    padding: 6px 0 12px;
  }

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

  .nav-list a {
    width: 100%;
    padding: 0 12px;
    border-radius: var(--radius-sm);
    justify-content: flex-start;
  }

  .site-main,
  .inner-main,
  .section,
  .hero,
  .footer-inner {
    padding-left: 16px;
    padding-right: 16px;
  }

  .inner-main {
    padding-bottom: 56px;
  }

  .hero {
    padding-top: 32px;
    padding-bottom: 44px;
  }

  .hero-title {
    font-size: 1.75rem;
  }

  .hero-lead {
    font-size: 1rem;
  }

  .home-main > .section {
    margin-bottom: 44px;
  }

  .home-main > .section:last-of-type {
    margin-bottom: 52px;
  }

  .page-header {
    padding: 16px 0 24px;
    margin-bottom: 28px;
  }

  .page-title {
    font-size: 1.5rem;
  }

  .section-head h2,
  .section-title {
    font-size: 1.25rem;
  }

  .step-title,
  .channel-name,
  .collection-name,
  .index-col-title,
  .boundary-item h3,
  .scenario-title,
  .usage-title,
  .example-item h3,
  .related-title,
  .related-links h2 {
    font-size: 1.0625rem;
  }

  .inner-main > section {
    margin-bottom: 40px;
  }

  /* 频道行：手机改为纵向堆叠 */
  .channel-row {
    grid-template-columns: minmax(0, 1fr);
    gap: 8px;
    padding: 16px;
  }

  .channel-audience {
    grid-column: auto;
  }

  .channel-row-list .channel-row {
    padding: 18px 16px;
  }

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

  .channel-meta dd {
    margin-bottom: 8px;
  }

  /* 卡片与列表统一单列 */
  .collection-cards,
  .step-list,
  .path-steps,
  .scenario-list,
  .index-columns,
  .boundaries .boundary-list,
  .examples .example-list,
  .usage-columns,
  .related-list,
  .guide-related .related-list {
    grid-template-columns: minmax(0, 1fr);
  }

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

  .collections-list .collection-media img {
    aspect-ratio: 16 / 9;
  }

  .collection-body {
    padding: 18px 16px 22px;
  }

  .collection-card .card-title,
  .collection-card .card-scope,
  .collection-card .card-basis,
  .collection-card .card-meta {
    padding-left: 16px;
    padding-right: 16px;
  }

  .step-item,
  .path-step {
    grid-template-columns: 40px minmax(0, 1fr);
    gap: 12px;
    padding: 18px 16px;
  }

  .step-index,
  .path-step .step-number {
    width: 40px;
    height: 40px;
    font-size: 0.9375rem;
  }

  .fields-boundary,
  .index-col,
  .boundary-item,
  .scenario-item,
  .usage-item,
  .example-item,
  .related-links {
    padding: 18px 16px;
  }

  .fields-table-wrap {
    overflow-x: auto;
  }

  .fields-table th,
  .fields-table td,
  .data-table th,
  .data-table td {
    padding: 10px 12px;
    font-size: 0.875rem;
  }

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

  .field-preview dd {
    margin-bottom: 8px;
  }

  .error-main {
    padding: 40px 16px 56px;
  }

  .error-panel {
    padding: 24px 18px;
  }

  .error-title {
    font-size: 1.5rem;
  }

  .error-code {
    font-size: 2rem;
  }

  .footer-inner {
    padding: 36px 16px 24px;
  }

  .footer-groups {
    grid-template-columns: minmax(0, 1fr);
    gap: 24px;
  }
}

@media (max-width: 390px) {
  .hero-title {
    font-size: 1.625rem;
  }

  .btn {
    width: 100%;
  }

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