/* ==========================================================================
   oulanfang.cn 全站样式
   分组：base / layout / components / pages / responsive
   ========================================================================== */

/* --------------------------------------------------------------------------
   base：变量、重置、基础排版
   -------------------------------------------------------------------------- */
:root {
  --color-text: #2b2f33;
  --color-text-soft: #5c646c;
  --color-bg: #f7f8f8;
  --color-card: #ffffff;
  --color-accent: #1f7a72;
  --color-accent-soft: #e6f1ef;
  --color-cool: #2f6f9e;
  --color-line: #dfe3e5;
  --color-line-strong: #c8ced2;
  --radius-sm: 4px;
  --radius-md: 6px;
  --radius-lg: 8px;
  --shadow-card: 0 1px 2px rgba(43, 47, 51, 0.05);
  --container: 1120px;
  --container-narrow: 900px;
  --space-xs: 6px;
  --space-sm: 12px;
  --space-md: 20px;
  --space-lg: 32px;
  --space-xl: 48px;
  --space-2xl: 64px;
}

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

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

body {
  margin: 0;
  background-color: var(--color-bg);
  color: var(--color-text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  font-size: 16px;
  line-height: 1.75;
  font-weight: 400;
}

h1,
h2,
h3,
h4 {
  margin: 0;
  font-weight: 600;
  line-height: 1.4;
  color: var(--color-text);
}

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-cool);
  text-decoration: underline;
}

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

figure {
  margin: 0;
}

figcaption {
  margin-top: var(--space-xs);
  color: var(--color-text-soft);
  font-size: 14px;
  line-height: 1.6;
}

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

button {
  font: inherit;
  color: inherit;
}

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

/* --------------------------------------------------------------------------
   layout：页头、主导航、主容器、面包屑、页脚骨架
   -------------------------------------------------------------------------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  background-color: var(--color-card);
  border-bottom: 1px solid var(--color-line);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-md);
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: 12px 24px;
  min-height: 66px;
}

.brand {
  display: flex;
  flex-direction: column;
  gap: 2px;
  color: var(--color-text);
  text-decoration: none;
}

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

.brand-name {
  font-size: 18px;
  font-weight: 600;
  line-height: 1.3;
}

.brand-tagline {
  color: var(--color-text-soft);
  font-size: 12px;
  line-height: 1.4;
}

.site-nav {
  display: block;
}

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

.nav-link {
  display: block;
  padding: 10px 12px;
  border-radius: var(--radius-sm);
  color: var(--color-text);
  font-size: 15px;
  line-height: 1.5;
  white-space: nowrap;
}

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

.nav-link.is-current {
  color: var(--color-accent);
  font-weight: 600;
  box-shadow: inset 0 -2px 0 var(--color-accent);
  border-radius: 0;
}

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

.nav-toggle-bar {
  display: block;
  width: 100%;
  height: 2px;
  background-color: var(--color-text);
  border-radius: 1px;
}

.site-main {
  display: block;
}

.inner-main {
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px var(--space-2xl);
}

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  padding: 20px 0 0;
  font-size: 14px;
  line-height: 1.6;
  color: var(--color-text-soft);
}

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

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

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

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

.page-header {
  padding: 20px 0 var(--space-lg);
  border-bottom: 1px solid var(--color-line);
  margin-bottom: var(--space-xl);
}

.page-title {
  font-size: 30px;
  font-weight: 600;
  line-height: 1.35;
  color: var(--color-text);
}

.page-description {
  margin-top: var(--space-sm);
  max-width: 760px;
  color: var(--color-text-soft);
  font-size: 16px;
  line-height: 1.75;
}

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

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

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

.footer-name {
  font-size: 16px;
  font-weight: 600;
  color: var(--color-text);
}

.footer-desc {
  margin-top: var(--space-xs);
  max-width: 320px;
  color: var(--color-text-soft);
  font-size: 14px;
  line-height: 1.7;
}

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

.footer-heading {
  font-size: 15px;
  font-weight: 600;
  color: var(--color-text);
}

.footer-heading a {
  color: var(--color-text);
}

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

.footer-list {
  margin-top: var(--space-sm);
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.footer-list a {
  color: var(--color-text-soft);
  font-size: 14px;
  line-height: 1.6;
}

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

.footer-note {
  margin-top: var(--space-sm);
  color: var(--color-text-soft);
  font-size: 14px;
  line-height: 1.7;
}

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

.copyright {
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: var(--space-md) 24px;
  color: var(--color-text-soft);
  font-size: 14px;
  line-height: 1.6;
}

/* --------------------------------------------------------------------------
   components：按钮、通用区块、表格、FAQ、步骤、链接
   -------------------------------------------------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 10px 20px;
  border: 1px solid transparent;
  border-radius: var(--radius-md);
  font-size: 15px;
  font-weight: 600;
  line-height: 1.4;
  text-align: center;
  cursor: pointer;
  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: #196259;
  border-color: #196259;
  color: #ffffff;
  text-decoration: none;
}

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

.btn-ghost:hover,
.btn-ghost:focus-visible {
  border-color: var(--color-accent);
  color: var(--color-accent);
  text-decoration: none;
}

.section {
  padding: var(--space-xl) 0;
  border-bottom: 1px solid var(--color-line);
}

.section:last-of-type {
  border-bottom: none;
}

.content-section {
  padding: var(--space-xl) 0;
  border-bottom: 1px solid var(--color-line);
}

.content-section:last-of-type {
  border-bottom: none;
}

.section-title {
  font-size: 22px;
  font-weight: 600;
  line-height: 1.4;
}

.section-head {
  margin-bottom: var(--space-lg);
}

.section-lead {
  margin-top: var(--space-sm);
  max-width: 780px;
  color: var(--color-text-soft);
  font-size: 16px;
  line-height: 1.75;
}

.section-intro {
  margin: var(--space-sm) 0 var(--space-lg);
  max-width: 780px;
  color: var(--color-text-soft);
  font-size: 16px;
  line-height: 1.75;
}

.section-text {
  margin-top: var(--space-md);
  max-width: 820px;
  color: var(--color-text);
  font-size: 16px;
  line-height: 1.8;
}

.section-text + .section-text {
  margin-top: var(--space-sm);
}

.section-note {
  margin-top: var(--space-lg);
  color: var(--color-text-soft);
  font-size: 14px;
  line-height: 1.8;
}

.section-note a {
  margin-right: 10px;
}

.sub-title {
  font-size: 18px;
  font-weight: 600;
}

.row-link,
.card-link,
.collection-link,
.step-link,
.text-link {
  display: inline-block;
  margin-top: var(--space-sm);
  color: var(--color-accent);
  font-size: 15px;
  font-weight: 600;
  line-height: 1.5;
}

.row-link::after,
.card-link::after,
.collection-link::after,
.step-link::after,
.text-link::after {
  content: " →";
  font-weight: 400;
}

.row-link:hover,
.card-link:hover,
.collection-link:hover,
.step-link:hover,
.text-link:hover,
.row-link:focus-visible,
.card-link:focus-visible,
.collection-link:focus-visible,
.step-link:focus-visible,
.text-link:focus-visible {
  color: var(--color-cool);
}

/* 表格 */
.table-wrap,
.fields-table-wrap {
  width: 100%;
  overflow-x: auto;
}

.fields-table,
.field-table,
.data-table {
  width: 100%;
  min-width: 560px;
  background-color: var(--color-card);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  font-size: 15px;
}

.table-caption,
.fields-table caption {
  padding: 12px 14px;
  text-align: left;
  color: var(--color-text-soft);
  font-size: 14px;
  line-height: 1.6;
}

.fields-table th,
.fields-table td,
.field-table th,
.field-table td,
.data-table th,
.data-table td {
  padding: 12px 14px;
  border-top: 1px solid var(--color-line);
  text-align: left;
  vertical-align: top;
  line-height: 1.7;
}

.fields-table thead th,
.field-table thead th,
.data-table thead th {
  background-color: var(--color-accent-soft);
  color: var(--color-text);
  font-weight: 600;
  border-top: none;
}

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

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

/* 折叠问答 */
.faq-item {
  background-color: var(--color-card);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  margin-top: var(--space-sm);
}

.faq-question {
  padding: 14px 16px;
  font-size: 16px;
  font-weight: 600;
  line-height: 1.6;
  cursor: pointer;
  list-style: none;
}

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

.faq-question::after {
  content: "＋";
  float: right;
  margin-left: var(--space-sm);
  color: var(--color-accent);
  font-weight: 400;
}

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

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

.faq-answer {
  padding: 0 16px 16px;
  color: var(--color-text-soft);
  font-size: 15px;
  line-height: 1.8;
}

.faq-list {
  margin-top: var(--space-md);
}

/* 编号步骤 */
.step-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
  margin-top: var(--space-md);
}

.step-item {
  display: flex;
  gap: var(--space-md);
  padding: var(--space-md);
  background-color: var(--color-card);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-card);
}

.step-index {
  flex: 0 0 auto;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 34px;
  height: 34px;
  background-color: var(--color-accent-soft);
  border-radius: 50%;
  color: var(--color-accent);
  font-size: 15px;
  font-weight: 600;
  line-height: 1;
}

.step-body {
  min-width: 220px;
  flex: 1 1 auto;
}

.step-title {
  font-size: 17px;
  font-weight: 600;
}

.step-desc,
.step-text {
  margin-top: var(--space-xs);
  color: var(--color-text-soft);
  font-size: 15px;
  line-height: 1.8;
}

/* 图片容器 */
figure img {
  width: 100%;
  height: auto;
  border-radius: var(--radius-md);
}

.hero-media img,
.content-media img,
.channel-media img,
.media-figure img,
.section-media img {
  width: 100%;
  height: auto;
  object-fit: cover;
  border-radius: var(--radius-md);
  background-color: var(--color-line);
}

/* --------------------------------------------------------------------------
   pages：首页
   -------------------------------------------------------------------------- */
.home-main {
  display: block;
}

.hero-section {
  padding: var(--space-2xl) 0 var(--space-xl);
  border-bottom: 1px solid var(--color-line);
}

.hero-inner {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
  gap: var(--space-xl);
  align-items: center;
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px;
}

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

.hero-eyebrow {
  color: var(--color-accent);
  font-size: 14px;
  font-weight: 600;
  line-height: 1.6;
}

.hero-title {
  margin-top: var(--space-sm);
  font-size: 32px;
  font-weight: 600;
  line-height: 1.35;
}

.hero-desc {
  margin-top: var(--space-md);
  max-width: 620px;
  color: var(--color-text-soft);
  font-size: 16px;
  line-height: 1.8;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
  margin-top: var(--space-lg);
}

.hero-points {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-md);
  margin-top: var(--space-lg);
  padding-top: var(--space-md);
  border-top: 1px solid var(--color-line);
}

.hero-points li {
  position: relative;
  padding-left: 16px;
  color: var(--color-text-soft);
  font-size: 14px;
  line-height: 1.7;
}

.hero-points li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 9px;
  width: 6px;
  height: 6px;
  background-color: var(--color-accent);
  border-radius: 50%;
}

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

.content-media-primary {
  width: 100%;
  max-width: var(--container);
  margin: var(--space-xl) auto 0;
  padding: 0 24px;
}

.content-media-primary img {
  width: 100%;
  max-height: 320px;
  object-fit: cover;
}

.channels-overview,
.collections-preview,
.fields-summary,
.guide-preview,
.site-index {
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding-left: 24px;
  padding-right: 24px;
}

/* 频道方向行 */
.channel-rows {
  display: flex;
  flex-direction: column;
  border-top: 1px solid var(--color-line);
}

.channel-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: var(--space-md);
  padding: var(--space-md) 0;
  border-bottom: 1px solid var(--color-line);
  transition: border-color 0.18s ease;
}

.channel-row:hover {
  border-color: var(--color-line-strong);
}

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

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

.channel-name {
  font-size: 18px;
  font-weight: 600;
}

.channel-orient {
  margin-top: var(--space-xs);
  color: var(--color-text-soft);
  font-size: 15px;
  line-height: 1.75;
}

.channel-org {
  color: var(--color-text);
  font-size: 15px;
  line-height: 1.75;
}

.channel-row:hover .channel-name {
  color: var(--color-accent);
}

/* 片单速览 */
.collection-cards {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--space-md);
}

.collection-card {
  display: flex;
  flex-direction: column;
  min-width: 0;
  padding: var(--space-md);
  background-color: var(--color-card);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card);
  transition: border-color 0.18s ease;
}

.collection-card:hover {
  border-color: var(--color-accent);
}

.collection-name {
  font-size: 18px;
  font-weight: 600;
}

.collection-scope {
  margin-top: var(--space-sm);
  color: var(--color-text-soft);
  font-size: 15px;
  line-height: 1.75;
}

.collection-rule {
  margin-top: var(--space-xs);
  color: var(--color-text-soft);
  font-size: 14px;
  line-height: 1.7;
}

.collection-card .card-link {
  margin-top: auto;
  padding-top: var(--space-sm);
}

/* 字段与边界摘要 */
.fields-layout {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
  gap: var(--space-lg);
  align-items: start;
}

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

.fields-boundary {
  min-width: 0;
  padding: var(--space-md);
  background-color: var(--color-card);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-lg);
}

.fields-boundary p {
  margin-top: var(--space-sm);
  color: var(--color-text-soft);
  font-size: 15px;
  line-height: 1.8;
}

/* 查阅路径预览 */
.guide-preview .step-list {
  margin-top: 0;
}

.guide-more {
  margin-top: var(--space-md);
}

/* 站内索引 */
.index-columns {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: var(--space-md);
}

.index-column {
  min-width: 0;
  padding: var(--space-md);
  background-color: var(--color-card);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-lg);
  transition: border-color 0.18s ease;
}

.index-column:hover {
  border-color: var(--color-accent);
}

.index-heading {
  font-size: 17px;
  font-weight: 600;
}

.index-heading a {
  color: var(--color-text);
}

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

.index-desc {
  margin-top: var(--space-xs);
  color: var(--color-text-soft);
  font-size: 14px;
  line-height: 1.7;
}

/* --------------------------------------------------------------------------
   pages：题材频道
   -------------------------------------------------------------------------- */
.section-division .section-text {
  max-width: 820px;
}

.section-channels .channel-row {
  display: grid;
  grid-template-columns: minmax(0, 0.42fr) minmax(0, 0.58fr);
  gap: var(--space-lg);
  padding: var(--space-lg) 0;
  border-bottom: 1px solid var(--color-line);
}

.section-channels .channel-row:first-of-type {
  border-top: 1px solid var(--color-line);
}

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

.channel-media img {
  width: 100%;
  aspect-ratio: 16 / 10;
  object-fit: cover;
  border-radius: var(--radius-md);
  background-color: var(--color-line);
}

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

.channel-orientation,
.channel-organize {
  margin-top: var(--space-sm);
  color: var(--color-text-soft);
  font-size: 15px;
  line-height: 1.8;
}

.channel-label {
  display: inline-block;
  margin-right: 8px;
  padding: 2px 8px;
  background-color: var(--color-accent-soft);
  border-radius: var(--radius-sm);
  color: var(--color-accent);
  font-size: 13px;
  font-weight: 600;
  line-height: 1.6;
}

.channel-link {
  margin-top: var(--space-sm);
}

.section-fieldmap .section-text a {
  font-weight: 600;
}

.section-boundary .faq-item:first-of-type {
  margin-top: var(--space-md);
}

/* --------------------------------------------------------------------------
   pages：专题片单
   -------------------------------------------------------------------------- */
.section-intro .section-text {
  max-width: 820px;
}

.collection-item {
  display: grid;
  grid-template-columns: minmax(0, 0.42fr) minmax(0, 0.58fr);
  gap: var(--space-lg);
  padding: var(--space-lg) 0;
  border-bottom: 1px solid var(--color-line);
}

.collection-item:first-of-type {
  border-top: 1px solid var(--color-line);
}

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

.media-figure img {
  width: 100%;
  aspect-ratio: 16 / 10;
  object-fit: cover;
  border-radius: var(--radius-md);
  background-color: var(--color-line);
}

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

.collection-body .collection-scope,
.collection-body .collection-rule {
  margin-top: var(--space-sm);
  color: var(--color-text-soft);
  font-size: 15px;
  line-height: 1.8;
}

.collection-body .collection-rule + .collection-rule {
  margin-top: var(--space-xs);
}

.label {
  display: inline-block;
  margin-right: 8px;
  padding: 2px 8px;
  background-color: var(--color-accent-soft);
  border-radius: var(--radius-sm);
  color: var(--color-accent);
  font-size: 13px;
  font-weight: 600;
  line-height: 1.6;
}

.relation-columns {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--space-lg);
  margin-top: var(--space-md);
}

.relation-column {
  min-width: 0;
  padding: var(--space-md);
  background-color: var(--color-card);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-lg);
}

.relation-heading {
  font-size: 17px;
  font-weight: 600;
}

.relation-text {
  margin-top: var(--space-sm);
  color: var(--color-text-soft);
  font-size: 15px;
  line-height: 1.8;
}

.section-update .step-list {
  margin-top: var(--space-md);
}

/* --------------------------------------------------------------------------
   pages：条目字段说明
   -------------------------------------------------------------------------- */
.section-media {
  margin: var(--space-md) 0 var(--space-lg);
}

.section-media img {
  width: 100%;
  max-height: 300px;
  object-fit: cover;
  border-radius: var(--radius-md);
  background-color: var(--color-line);
}

.rule-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--space-md);
  margin-top: var(--space-md);
}

.rule-item {
  min-width: 0;
  padding: var(--space-md);
  background-color: var(--color-card);
  border: 1px solid var(--color-line);
  border-left: 3px solid var(--color-accent);
  border-radius: var(--radius-md);
}

.rule-name {
  font-size: 17px;
  font-weight: 600;
}

.rule-text {
  margin-top: var(--space-xs);
  color: var(--color-text-soft);
  font-size: 15px;
  line-height: 1.8;
}

.section-fields-mapping .table-wrap {
  margin-top: var(--space-md);
}

.section-aside {
  margin-top: var(--space-lg);
  padding: var(--space-md);
  background-color: var(--color-card);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-lg);
}

.aside-title {
  font-size: 17px;
  font-weight: 600;
}

.aside-text {
  margin-top: var(--space-sm);
  color: var(--color-text-soft);
  font-size: 15px;
  line-height: 1.8;
}

.aside-text a {
  margin-right: 10px;
  font-weight: 600;
}

/* --------------------------------------------------------------------------
   pages：查阅路径指引
   -------------------------------------------------------------------------- */
.section-steps .media-figure {
  margin: var(--space-md) 0 var(--space-lg);
}

.media-figure-guide img {
  width: 100%;
  max-height: 300px;
  object-fit: cover;
  border-radius: var(--radius-md);
  background-color: var(--color-line);
}

.section-steps .step-list {
  margin-top: var(--space-md);
}

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

.path-card {
  display: flex;
  flex-direction: column;
  min-width: 0;
  padding: var(--space-md);
  background-color: var(--color-card);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card);
  transition: border-color 0.18s ease;
}

.path-card:hover {
  border-color: var(--color-accent);
}

.path-title {
  font-size: 17px;
  font-weight: 600;
}

.path-scene {
  margin-top: var(--space-xs);
  color: var(--color-accent);
  font-size: 14px;
  line-height: 1.7;
}

.path-desc {
  margin-top: var(--space-sm);
  color: var(--color-text-soft);
  font-size: 15px;
  line-height: 1.8;
}

.path-card .text-link {
  margin-top: auto;
  padding-top: var(--space-sm);
}

.log-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
  margin-top: var(--space-md);
}

.log-item {
  min-width: 0;
  padding: var(--space-md);
  background-color: var(--color-card);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
}

.log-date {
  display: inline-block;
  color: var(--color-cool);
  font-size: 14px;
  font-weight: 600;
  line-height: 1.6;
}

.log-title {
  margin-top: var(--space-xs);
  font-size: 17px;
  font-weight: 600;
}

.log-text {
  margin-top: var(--space-xs);
  color: var(--color-text-soft);
  font-size: 15px;
  line-height: 1.8;
}

.section-next .next-links {
  margin-top: var(--space-md);
}

.next-list {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: var(--space-md);
}

.next-item {
  min-width: 0;
}

.next-link {
  display: flex;
  align-items: center;
  min-height: 44px;
  padding: 12px 16px;
  background-color: var(--color-card);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  color: var(--color-text);
  font-size: 15px;
  font-weight: 600;
  line-height: 1.5;
  transition: border-color 0.18s ease, color 0.18s ease;
}

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

/* --------------------------------------------------------------------------
   pages：404
   -------------------------------------------------------------------------- */
.error-main {
  display: block;
  padding: var(--space-2xl) 0;
}

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

.error-code {
  color: var(--color-accent);
  font-size: 14px;
  font-weight: 600;
  line-height: 1.6;
}

.error-title {
  margin-top: var(--space-sm);
  font-size: 30px;
  font-weight: 600;
  line-height: 1.35;
}

.error-text {
  margin-top: var(--space-md);
  max-width: 640px;
  color: var(--color-text-soft);
  font-size: 16px;
  line-height: 1.8;
}

.error-actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
  margin-top: var(--space-lg);
}

.error-help {
  margin-top: var(--space-xl);
  padding-top: var(--space-lg);
  border-top: 1px solid var(--color-line);
}

.error-subtitle {
  font-size: 20px;
  font-weight: 600;
}

.error-links {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--space-md);
  margin-top: var(--space-md);
}

.error-links a {
  display: flex;
  align-items: center;
  min-height: 44px;
  padding: 12px 16px;
  background-color: var(--color-card);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  color: var(--color-text);
  font-size: 15px;
  font-weight: 600;
  line-height: 1.5;
  transition: border-color 0.18s ease, color 0.18s ease;
}

.error-links a:hover,
.error-links a:focus-visible {
  border-color: var(--color-accent);
  color: var(--color-accent);
  text-decoration: none;
}

/* --------------------------------------------------------------------------
   responsive：断点 1024 / 768 / 480
   -------------------------------------------------------------------------- */
@media (max-width: 1024px) {
  .footer-inner {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

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

@media (max-width: 768px) {
  .header-inner {
    flex-wrap: wrap;
    row-gap: 8px;
    padding: 10px 16px;
  }

  .nav-toggle {
    display: flex;
  }

  .site-nav {
    flex: 1 0 100%;
    order: 3;
  }

  .nav-list {
    display: none;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    width: 100%;
    padding: 6px 0;
    border-top: 1px solid var(--color-line);
  }

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

  .nav-link {
    min-height: 44px;
    display: flex;
    align-items: center;
    padding: 10px 8px;
    border-radius: var(--radius-sm);
  }

  .nav-link.is-current {
    box-shadow: none;
    background-color: var(--color-accent-soft);
    border-radius: var(--radius-sm);
  }

  .inner-main {
    padding: 0 16px var(--space-xl);
  }

  .page-header {
    padding: 16px 0 var(--space-md);
    margin-bottom: var(--space-lg);
  }

  .page-title {
    font-size: 25px;
  }

  .hero-section {
    padding: var(--space-xl) 0 var(--space-lg);
  }

  .hero-inner {
    grid-template-columns: minmax(0, 1fr);
    gap: var(--space-lg);
    padding: 0 16px;
  }

  .hero-media {
    order: 2;
  }

  .hero-text {
    order: 1;
  }

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

  .content-media-primary {
    margin-top: var(--space-lg);
    padding: 0 16px;
  }

  .channels-overview,
  .collections-preview,
  .fields-summary,
  .guide-preview,
  .site-index {
    padding-left: 16px;
    padding-right: 16px;
  }

  .section,
  .content-section {
    padding: var(--space-lg) 0;
  }

  .channel-row {
    grid-template-columns: minmax(0, 1fr);
    gap: var(--space-sm);
  }

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

  .fields-layout {
    grid-template-columns: minmax(0, 1fr);
    gap: var(--space-md);
  }

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

  .section-channels .channel-row,
  .collection-item {
    grid-template-columns: minmax(0, 1fr);
    gap: var(--space-md);
  }

  .relation-columns {
    grid-template-columns: minmax(0, 1fr);
    gap: var(--space-md);
  }

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

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

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

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

  .footer-inner {
    grid-template-columns: minmax(0, 1fr);
    gap: var(--space-lg);
    padding: var(--space-lg) 16px;
  }

  .footer-desc {
    max-width: none;
  }

  .copyright {
    padding: var(--space-md) 16px;
  }
}

@media (max-width: 480px) {
  body {
    font-size: 15.5px;
  }

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

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

  .page-title {
    font-size: 22px;
  }

  .hero-title {
    font-size: 23px;
  }

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

  .step-item {
    padding: var(--space-sm);
    gap: var(--space-sm);
  }

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

  .hero-actions .btn {
    flex: 1 1 auto;
  }

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

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

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