/* ==========================================================================
   飘花电影网手机版 · 全站样式表
   结构：base → layout → components → pages → responsive
   ========================================================================== */

/* --------------------------------------------------------------------------
   base · 变量与基础重置
   -------------------------------------------------------------------------- */
:root {
  --paper: #f7f4ee;
  --ink: #23201c;
  --clay: #9c5b3c;
  --moss: #5f6f52;
  --sand: #e6e0d4;
  --ink-soft: #5c554c;
  --paper-card: #fffdf9;
  --radius: 6px;
  --shadow: 0 1px 2px rgba(35, 32, 28, 0.06);
  --container: 1120px;
  --content: 720px;
  --sidebar: 200px;
  --gap: 32px;
  --font: "Source Han Sans SC", "Noto Sans CJK SC", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", "Heiti SC", sans-serif;
}

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

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

body {
  margin: 0;
  padding: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font);
  font-size: 16px;
  font-weight: 400;
  line-height: 1.85;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

h1,
h2,
h3,
h4,
p,
figure,
blockquote,
dl,
dd,
ol,
ul {
  margin: 0;
}

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

img {
  display: block;
  max-width: 100%;
  height: auto;
  border: 0;
}

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

a:hover,
a:focus-visible {
  color: #7c4229;
}

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

button {
  font: inherit;
  color: inherit;
  background: none;
  border: 0;
  cursor: pointer;
}

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

/* --------------------------------------------------------------------------
   layout · 全站骨架：页头 / 导航 / 主体 / 页脚
   -------------------------------------------------------------------------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 30;
  background: var(--paper);
  border-bottom: 1px solid var(--sand);
}

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

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--ink);
  font-weight: 600;
  flex-shrink: 0;
}

.brand:hover,
.brand:focus-visible {
  color: var(--ink);
}

.brand-mark {
  width: 26px;
  height: 26px;
  border: 2px solid var(--clay);
  border-radius: 4px;
  position: relative;
  flex-shrink: 0;
}

.brand-mark::after {
  content: "";
  position: absolute;
  inset: 5px;
  background: var(--moss);
  border-radius: 2px;
}

.brand-name {
  font-size: 17px;
  line-height: 1.3;
  letter-spacing: 0.01em;
}

.nav-toggle {
  display: none;
  width: 44px;
  height: 44px;
  margin-left: auto;
  padding: 10px;
  border: 1px solid var(--sand);
  border-radius: var(--radius);
  background: var(--paper-card);
  flex-direction: column;
  justify-content: space-between;
}

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

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

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

.nav-link {
  display: inline-block;
  padding: 8px 14px;
  color: var(--ink-soft);
  font-size: 15px;
  border-radius: var(--radius);
  border: 1px solid transparent;
  transition: color 0.18s ease, border-color 0.18s ease, background 0.18s ease;
}

.nav-link:hover,
.nav-link:focus-visible {
  color: var(--ink);
  border-color: var(--sand);
  background: var(--paper-card);
}

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

.site-main {
  display: block;
}

.inner-main {
  max-width: var(--container);
  margin: 0 auto;
  padding: 28px 24px 64px;
}

.home-main {
  max-width: 100%;
}

/* 页脚 */
.site-footer {
  background: #efe9df;
  color: var(--ink);
  border-top: 1px solid var(--sand);
  margin-top: 56px;
}

.footer-inner {
  max-width: var(--container);
  margin: 0 auto;
  padding: 44px 24px 28px;
  display: grid;
  grid-template-columns: 1.4fr repeat(4, minmax(0, 1fr));
  gap: 28px 32px;
}

.footer-brand-name {
  font-size: 17px;
  font-weight: 600;
  margin-bottom: 10px;
}

.footer-brand-desc {
  font-size: 14px;
  line-height: 1.7;
  color: var(--ink-soft);
}

.footer-group-title {
  font-size: 15px;
  font-weight: 600;
  margin-bottom: 12px;
  color: var(--ink);
}

.footer-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.footer-link {
  font-size: 14px;
  line-height: 1.6;
  color: var(--ink-soft);
}

.footer-link:hover,
.footer-link:focus-visible {
  color: var(--clay);
}

.footer-bottom {
  border-top: 1px solid var(--sand);
  padding: 16px 24px;
  max-width: var(--container);
  margin: 0 auto;
}

.footer-copy {
  font-size: 13px;
  line-height: 1.7;
  color: var(--ink-soft);
}

/* --------------------------------------------------------------------------
   components · 通用模块（标题、卡片、列表、按钮、表格、FAQ）
   -------------------------------------------------------------------------- */
.section {
  padding: 44px 0;
  border-top: 1px solid var(--sand);
}

.section:first-child {
  border-top: 0;
}

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

.section-title {
  font-size: 22px;
  line-height: 1.4;
  font-weight: 600;
  color: var(--ink);
  margin-bottom: 8px;
}

.section-desc,
.section-intro,
.section-text {
  font-size: 15px;
  line-height: 1.85;
  color: var(--ink-soft);
}

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

.section-note {
  margin-top: 14px;
  font-size: 14px;
  line-height: 1.75;
  color: var(--moss);
}

.section-figure,
.media-figure,
.hero-media,
.section-media {
  margin: 22px 0;
}

.section-figure img,
.media-figure img,
.hero-media img,
.section-media img {
  width: 100%;
  height: auto;
  border: 1px solid var(--sand);
  border-radius: var(--radius);
  background: var(--paper-card);
  object-fit: cover;
}

.figure-caption,
.media-caption,
.hero-media-caption,
.section-media-caption {
  margin-top: 10px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--ink-soft);
}

/* 按钮 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 10px 20px;
  font-size: 15px;
  font-weight: 600;
  border-radius: var(--radius);
  border: 1px solid transparent;
  transition: transform 0.18s ease, border-color 0.18s ease,
    background 0.18s ease, color 0.18s ease;
}

.btn-primary {
  background: var(--clay);
  color: #fffdf9;
  border-color: var(--clay);
}

.btn-primary:hover,
.btn-primary:focus-visible {
  background: #86492e;
  border-color: #86492e;
  color: #fffdf9;
  transform: translateY(-2px);
}

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

.btn-ghost:hover,
.btn-ghost:focus-visible {
  border-color: var(--clay);
  color: var(--clay);
  transform: translateY(-2px);
}

/* 通用列表 */
.point-list,
.criteria-list,
.scope-list,
.record-list,
.edge-list,
.boundary-list,
.result-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.point-item,
.criteria-item,
.scope-list li,
.record-list li,
.edge-item,
.boundary-item {
  position: relative;
  padding-left: 18px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink-soft);
}

.point-item::before,
.criteria-item::before,
.scope-list li::before,
.record-list li::before,
.edge-item::before,
.boundary-item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.75em;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--clay);
}

.boundary-in .boundary-item::before {
  background: var(--moss);
}

.boundary-out .boundary-item::before {
  background: #b08a6f;
}

/* 相关链接块 */
.related-block {
  border-top: 1px solid var(--sand);
}

.related-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.related-item {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 6px 12px;
  padding: 12px 14px;
  background: var(--paper-card);
  border: 1px solid var(--sand);
  border-radius: var(--radius);
  transition: border-color 0.18s ease, transform 0.18s ease;
}

.related-item:hover {
  border-color: var(--clay);
  transform: translateY(-2px);
}

.related-link {
  font-size: 15px;
  font-weight: 600;
  color: var(--clay);
}

.related-desc {
  font-size: 14px;
  line-height: 1.7;
  color: var(--ink-soft);
}

/* 面包屑 */
.breadcrumb {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--ink-soft);
  margin-bottom: 18px;
}

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

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

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

.breadcrumb-current {
  color: var(--ink);
  font-weight: 600;
}

/* 页面标题区 */
.page-header {
  padding-bottom: 22px;
  margin-bottom: 28px;
  border-bottom: 1px solid var(--sand);
}

.page-title {
  font-size: 30px;
  line-height: 1.3;
  font-weight: 600;
  color: var(--ink);
  margin-bottom: 10px;
}

.page-description {
  font-size: 15px;
  line-height: 1.85;
  color: var(--ink-soft);
  max-width: var(--content);
}

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

.field-table {
  min-width: 520px;
  font-size: 15px;
}

.field-table-caption {
  caption-side: top;
  text-align: left;
  padding: 14px 16px 0;
  font-size: 14px;
  color: var(--ink-soft);
}

.field-table th,
.field-table td {
  padding: 12px 16px;
  text-align: left;
  vertical-align: top;
  line-height: 1.75;
  border-bottom: 1px solid var(--sand);
}

.field-table thead th {
  background: #f1ece3;
  font-weight: 600;
  color: var(--ink);
  white-space: nowrap;
}

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

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

.field-table tbody td {
  color: var(--ink-soft);
}

/* FAQ 折叠 */
.faq-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.faq-item {
  background: var(--paper-card);
  border: 1px solid var(--sand);
  border-radius: var(--radius);
  padding: 4px 16px;
}

.faq-item[open] {
  border-color: var(--clay);
}

.faq-question {
  cursor: pointer;
  list-style: none;
  padding: 12px 26px 12px 0;
  font-size: 16px;
  font-weight: 600;
  line-height: 1.7;
  color: var(--ink);
  position: relative;
}

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

.faq-question::after {
  content: "";
  position: absolute;
  right: 2px;
  top: 50%;
  width: 9px;
  height: 9px;
  border-right: 2px solid var(--clay);
  border-bottom: 2px solid var(--clay);
  transform: translateY(-70%) rotate(45deg);
  transition: transform 0.2s ease;
}

.faq-item[open] .faq-question::after {
  transform: translateY(-30%) rotate(-135deg);
}

.faq-answer {
  padding: 0 26px 14px 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--ink-soft);
}

/* --------------------------------------------------------------------------
   layout · 内页两栏：侧栏 + 主内容
   -------------------------------------------------------------------------- */
.page-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) var(--sidebar);
  gap: var(--gap);
  align-items: start;
}

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

.page-content {
  min-width: 0;
  max-width: var(--content);
}

.page-sidebar,
.page-aside {
  min-width: var(--sidebar);
  position: sticky;
  top: 84px;
  align-self: start;
  border-left: 1px solid var(--sand);
  padding-left: 18px;
}

.sidebar-left .page-sidebar,
.sidebar-left .page-aside,
.page-layout.sidebar-left .page-sidebar,
.page-layout.sidebar-left .page-aside {
  border-left: 0;
  border-right: 1px solid var(--sand);
  padding-left: 0;
  padding-right: 18px;
}

.sidebar-title,
.toc-title {
  font-size: 15px;
  font-weight: 600;
  color: var(--ink);
  margin-bottom: 12px;
}

.sidebar-list,
.toc-list {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.sidebar-link,
.toc-link {
  display: block;
  padding: 6px 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--ink-soft);
  border-bottom: 1px dashed transparent;
}

.sidebar-link:hover,
.sidebar-link:focus-visible,
.toc-link:hover,
.toc-link:focus-visible {
  color: var(--clay);
}

.sidebar-link.is-active,
.toc-link.is-active {
  color: var(--clay);
  font-weight: 600;
  border-bottom-color: var(--clay);
}

/* --------------------------------------------------------------------------
   pages · 首页
   -------------------------------------------------------------------------- */
.fact-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 6px 18px;
  padding: 9px 24px;
  background: var(--ink);
  color: #f2ece2;
}

.fact-bar-text {
  font-size: 13px;
  line-height: 1.6;
}

.fact-bar-link {
  font-size: 13px;
  line-height: 1.6;
  color: #e9c9b6;
  text-decoration: underline;
  text-underline-offset: 3px;
}

.fact-bar-link:hover,
.fact-bar-link:focus-visible {
  color: #fffdf9;
}

.hero {
  max-width: var(--container);
  margin: 0 auto;
  padding: 48px 24px 36px;
}

.hero-inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: 40px;
  align-items: start;
}

.hero-eyebrow {
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--moss);
  margin-bottom: 12px;
}

.hero-title {
  font-size: 30px;
  line-height: 1.3;
  font-weight: 600;
  color: var(--ink);
  margin-bottom: 14px;
}

.hero-desc {
  font-size: 16px;
  line-height: 1.85;
  color: var(--ink-soft);
  max-width: 34em;
}

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

.hero-panel {
  background: var(--paper-card);
  border: 1px solid var(--sand);
  border-radius: var(--radius);
  padding: 22px 24px;
  box-shadow: var(--shadow);
}

.hero-panel-title {
  font-size: 17px;
  font-weight: 600;
  color: var(--ink);
  margin-bottom: 14px;
}

.hero-channel-list {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.hero-channel-group {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding-bottom: 12px;
  border-bottom: 1px dashed var(--sand);
}

.hero-channel-group:last-child {
  padding-bottom: 0;
  border-bottom: 0;
}

.hero-channel-label {
  font-size: 14px;
  font-weight: 600;
  color: var(--clay);
}

.hero-channel-items {
  font-size: 14px;
  line-height: 1.75;
  color: var(--ink-soft);
}

.hero-panel-note {
  margin-top: 16px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--ink-soft);
}

.hero-media {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px;
}

.hero-media img {
  width: 100%;
  aspect-ratio: 16 / 7;
  object-fit: cover;
}

/* 首页各 section 统一容器 */
.home-main > .section {
  max-width: var(--container);
  margin: 0 auto;
  padding: 44px 24px;
}

.home-main > .section:first-of-type {
  border-top: 1px solid var(--sand);
}

.channel-rows {
  display: flex;
  flex-direction: column;
  gap: 0;
  border-top: 1px solid var(--sand);
}

.channel-row {
  display: grid;
  grid-template-columns: 56px minmax(0, 1fr) auto;
  align-items: center;
  gap: 18px;
  padding: 16px 0;
  border-bottom: 1px solid var(--sand);
}

.channel-no {
  font-size: 14px;
  font-weight: 600;
  color: var(--clay);
  letter-spacing: 0.04em;
}

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

.channel-name {
  font-size: 17px;
  font-weight: 600;
  line-height: 1.5;
  color: var(--ink);
  margin-bottom: 4px;
}

.channel-scope {
  font-size: 14px;
  line-height: 1.75;
  color: var(--ink-soft);
}

.channel-enter {
  font-size: 14px;
  font-weight: 600;
  color: var(--clay);
  white-space: nowrap;
  padding: 8px 12px;
  border: 1px solid var(--sand);
  border-radius: var(--radius);
  transition: border-color 0.18s ease, transform 0.18s ease;
}

.channel-enter:hover,
.channel-enter:focus-visible {
  border-color: var(--clay);
  transform: translateY(-2px);
}

.collection-cards {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 24px;
}

.collection-card {
  display: flex;
  flex-direction: column;
  background: var(--paper-card);
  border: 1px solid var(--sand);
  border-radius: var(--radius);
  overflow: hidden;
  transition: border-color 0.18s ease, transform 0.18s ease;
}

.collection-card:hover {
  border-color: var(--clay);
  transform: translateY(-2px);
}

.collection-media {
  margin: 0;
}

.collection-media img {
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  border-bottom: 1px solid var(--sand);
}

.collection-body {
  padding: 18px 20px 20px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  flex: 1;
}

.collection-name {
  font-size: 17px;
  font-weight: 600;
  line-height: 1.5;
  color: var(--ink);
}

.collection-note {
  font-size: 14px;
  line-height: 1.8;
  color: var(--ink-soft);
}

.collection-link {
  margin-top: auto;
  font-size: 14px;
  font-weight: 600;
  color: var(--clay);
}

.field-columns {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 32px;
}

.field-col,
.boundary-col {
  min-width: 0;
}

.field-col-title {
  font-size: 17px;
  font-weight: 600;
  color: var(--ink);
  margin-bottom: 14px;
}

.field-list {
  display: flex;
  flex-direction: column;
  gap: 0;
  border-top: 1px solid var(--sand);
}

.field-term {
  padding-top: 12px;
  font-size: 15px;
  font-weight: 600;
  color: var(--clay);
}

.field-def {
  padding-bottom: 12px;
  font-size: 14px;
  line-height: 1.8;
  color: var(--ink-soft);
  border-bottom: 1px solid var(--sand);
}

.field-more {
  margin-top: 14px;
  font-size: 14px;
}

.boundary-list + .boundary-list {
  margin-top: 16px;
}

.browse-steps .step-list {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 20px;
}

.browse-steps .step-item {
  background: var(--paper-card);
  border: 1px solid var(--sand);
  border-radius: var(--radius);
  padding: 18px 18px 20px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.browse-steps .step-no {
  font-size: 13px;
  font-weight: 600;
  color: var(--clay);
  letter-spacing: 0.06em;
}

.browse-steps .step-name {
  font-size: 16px;
  font-weight: 600;
  line-height: 1.5;
  color: var(--ink);
}

.browse-steps .step-desc {
  font-size: 14px;
  line-height: 1.8;
  color: var(--ink-soft);
}

.browse-steps .step-result {
  font-size: 13px;
  line-height: 1.7;
  color: var(--moss);
  padding-top: 8px;
  border-top: 1px dashed var(--sand);
}

.steps-more {
  margin-top: 18px;
  font-size: 14px;
}

.index-grid {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 16px;
}

.index-cell {
  min-width: 0;
}

.index-link {
  display: flex;
  flex-direction: column;
  gap: 6px;
  min-height: 100%;
  padding: 16px 16px 18px;
  background: var(--paper-card);
  border: 1px solid var(--sand);
  border-radius: var(--radius);
  transition: border-color 0.18s ease, transform 0.18s ease;
}

.index-link:hover,
.index-link:focus-visible {
  border-color: var(--clay);
  transform: translateY(-2px);
}

.index-name {
  font-size: 15px;
  font-weight: 600;
  color: var(--ink);
}

.index-note {
  font-size: 13px;
  line-height: 1.7;
  color: var(--ink-soft);
}

/* --------------------------------------------------------------------------
   pages · 内页业务模块
   -------------------------------------------------------------------------- */
.content-section {
  padding-bottom: 32px;
  margin-bottom: 32px;
  border-bottom: 1px solid var(--sand);
}

.content-section:last-of-type {
  border-bottom: 0;
  margin-bottom: 0;
  padding-bottom: 0;
}

.content-section .section-title {
  margin-bottom: 12px;
}

.content-section .section-text + .point-list,
.content-section .section-intro + .point-list,
.content-section .section-intro + .criteria-list,
.content-section .section-text + .channel-rows {
  margin-top: 16px;
}

/* 题材频道页 */
.page-channels .channel-rows {
  border-top: 1px solid var(--sand);
}

.page-channels .channel-row {
  display: block;
  padding: 18px 0;
  border-bottom: 1px solid var(--sand);
}

.page-channels .channel-no {
  display: block;
  margin-bottom: 6px;
}

.page-channels .channel-name {
  margin-bottom: 6px;
}

.page-channels .channel-scope,
.page-channels .channel-fields,
.page-channels .channel-scene {
  font-size: 14px;
  line-height: 1.8;
  color: var(--ink-soft);
}

.page-channels .channel-fields {
  margin-top: 6px;
}

.page-channels .channel-scene {
  margin-top: 6px;
  color: var(--moss);
}

.edge-columns {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 28px;
  margin-top: 16px;
}

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

.edge-col-title {
  font-size: 16px;
  font-weight: 600;
  color: var(--ink);
  margin-bottom: 12px;
}

/* 专题片单页 */
.topic-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 24px;
  margin-top: 16px;
}

.topic-card {
  display: flex;
  flex-direction: column;
  gap: 10px;
  background: var(--paper-card);
  border: 1px solid var(--sand);
  border-radius: var(--radius);
  padding: 16px 18px 18px;
  transition: border-color 0.18s ease, transform 0.18s ease;
}

.topic-card:hover {
  border-color: var(--clay);
  transform: translateY(-2px);
}

.topic-figure {
  margin: 0;
}

.topic-figure img {
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  border-radius: 4px;
  border: 1px solid var(--sand);
}

.topic-name {
  font-size: 17px;
  font-weight: 600;
  line-height: 1.5;
  color: var(--ink);
}

.topic-criteria {
  font-size: 14px;
  line-height: 1.8;
  color: var(--ink-soft);
}

.topic-link {
  margin-top: auto;
  font-size: 14px;
  font-weight: 600;
  color: var(--clay);
}

.order-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin: 14px 0;
  counter-reset: order;
}

.order-item {
  position: relative;
  padding-left: 34px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink-soft);
  counter-increment: order;
}

.order-item::before {
  content: counter(order);
  position: absolute;
  left: 0;
  top: 0.25em;
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: #f1ece3;
  border: 1px solid var(--sand);
  color: var(--clay);
  font-size: 12px;
  font-weight: 600;
  line-height: 20px;
  text-align: center;
}

.pair-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 28px;
  margin-top: 16px;
}

.pair-column {
  min-width: 0;
}

.pair-title {
  font-size: 16px;
  font-weight: 600;
  color: var(--ink);
  margin-bottom: 10px;
}

.pair-text {
  font-size: 15px;
  line-height: 1.85;
  color: var(--ink-soft);
  margin-bottom: 10px;
}

.pair-link {
  font-size: 14px;
  font-weight: 600;
  color: var(--clay);
}

/* 浏览指引页 */
.page-guide .section-steps .step-list {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 20px;
  margin-top: 16px;
}

.page-guide .step-item {
  background: var(--paper-card);
  border: 1px solid var(--sand);
  border-radius: var(--radius);
  padding: 18px 18px 20px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.page-guide .step-index {
  font-size: 13px;
  font-weight: 600;
  color: var(--clay);
  letter-spacing: 0.06em;
}

.page-guide .section-steps .step-name {
  font-size: 16px;
  font-weight: 600;
  line-height: 1.5;
  color: var(--ink);
}

.page-guide .section-steps .step-desc {
  font-size: 14px;
  line-height: 1.8;
  color: var(--ink-soft);
}

.page-guide .section-results .result-list {
  margin-top: 16px;
}

.page-guide .result-item {
  display: grid;
  grid-template-columns: 72px minmax(0, 1fr);
  gap: 14px;
  padding: 12px 0;
  border-bottom: 1px solid var(--sand);
}

.page-guide .result-item:last-child {
  border-bottom: 0;
}

.page-guide .result-index {
  font-size: 14px;
  font-weight: 600;
  color: var(--clay);
}

.page-guide .result-text {
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink-soft);
}

.page-guide .faq-list {
  margin-top: 16px;
}

/* 字段与边界页 */
.page-boundary .media-figure img {
  aspect-ratio: 16 / 9;
  object-fit: cover;
}

.page-boundary .table-wrap {
  margin-top: 16px;
}

.scope-columns {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 28px;
  margin-top: 16px;
}

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

.scope-col-title {
  font-size: 16px;
  font-weight: 600;
  color: var(--ink);
  margin-bottom: 12px;
}

.scope-col-in .scope-col-title {
  color: var(--moss);
}

.scope-col-out .scope-col-title {
  color: #8a6a4f;
}

.record-groups {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 24px;
  margin-top: 16px;
}

.record-group {
  min-width: 0;
  background: var(--paper-card);
  border: 1px solid var(--sand);
  border-radius: var(--radius);
  padding: 18px 20px 20px;
}

.record-group-title {
  font-size: 16px;
  font-weight: 600;
  color: var(--ink);
  margin-bottom: 12px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--sand);
}

/* 404 */
.error-main {
  max-width: var(--container);
  margin: 0 auto;
  padding: 64px 24px 72px;
}

.error-panel {
  max-width: 640px;
}

.error-code {
  font-size: 44px;
  line-height: 1.1;
  font-weight: 600;
  color: var(--clay);
  letter-spacing: 0.04em;
  margin-bottom: 12px;
}

.error-title {
  font-size: 30px;
  line-height: 1.3;
  font-weight: 600;
  color: var(--ink);
  margin-bottom: 12px;
}

.error-desc {
  font-size: 15px;
  line-height: 1.85;
  color: var(--ink-soft);
}

.error-desc + .error-desc {
  margin-top: 10px;
}

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

.error-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 10px 20px;
  font-size: 15px;
  font-weight: 600;
  color: var(--ink);
  background: var(--paper-card);
  border: 1px solid var(--sand);
  border-radius: var(--radius);
  transition: border-color 0.18s ease, color 0.18s ease,
    transform 0.18s ease;
}

.error-button:hover,
.error-button:focus-visible {
  border-color: var(--clay);
  color: var(--clay);
  transform: translateY(-2px);
}

/* --------------------------------------------------------------------------
   responsive · 1024px / 768px / 480px
   -------------------------------------------------------------------------- */
@media (max-width: 1024px) {
  :root {
    --gap: 24px;
  }

  .header-inner {
    padding: 12px 20px;
    gap: 16px;
  }

  .nav-link {
    padding: 8px 10px;
    font-size: 14px;
  }

  .hero {
    padding: 40px 20px 32px;
  }

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

  .hero-media {
    padding: 0 20px;
  }

  .home-main > .section {
    padding: 36px 20px;
  }

  .footer-inner {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 24px;
  }

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

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

  .page-sidebar,
  .page-aside,
  .sidebar-left .page-sidebar,
  .sidebar-left .page-aside,
  .page-layout.sidebar-left .page-sidebar,
  .page-layout.sidebar-left .page-aside {
    position: static;
    min-width: 0;
    border-left: 0;
    border-right: 0;
    padding: 0 0 16px;
    border-bottom: 1px solid var(--sand);
  }

  .sidebar-list,
  .toc-list {
    flex-direction: row;
    flex-wrap: wrap;
    gap: 6px 16px;
  }

  .page-content {
    max-width: 100%;
  }

  .browse-steps .step-list,
  .page-guide .section-steps .step-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .index-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (max-width: 768px) {
  .site-header {
    position: sticky;
  }

  .header-inner {
    flex-wrap: wrap;
    padding: 12px 18px;
  }

  .nav-toggle {
    display: flex;
  }

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

  .nav-list {
    display: none;
    flex-direction: column;
    align-items: stretch;
    gap: 2px;
    padding: 8px 0 4px;
    border-top: 1px solid var(--sand);
    margin-top: 8px;
  }

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

  .nav-link {
    display: block;
    padding: 12px;
    font-size: 15px;
    min-height: 44px;
  }

  .fact-bar {
    justify-content: flex-start;
    padding: 9px 18px;
  }

  .hero {
    padding: 32px 18px 26px;
  }

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

  .hero-media {
    padding: 0 18px;
  }

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

  .home-main > .section {
    padding: 30px 18px;
  }

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

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

  .channel-row {
    grid-template-columns: 40px minmax(0, 1fr);
    gap: 12px 14px;
  }

  .channel-enter {
    grid-column: 1 / -1;
    justify-self: start;
  }

  .collection-cards,
  .field-columns,
  .edge-columns,
  .topic-grid,
  .pair-grid,
  .scope-columns,
  .record-groups {
    grid-template-columns: minmax(0, 1fr);
    gap: 20px;
  }

  .browse-steps .step-list,
  .page-guide .section-steps .step-list {
    grid-template-columns: minmax(0, 1fr);
  }

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

  .page-guide .result-item {
    grid-template-columns: minmax(0, 1fr);
    gap: 4px;
  }

  .inner-main {
    padding: 22px 18px 52px;
  }

  .footer-inner {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    padding: 34px 18px 22px;
    gap: 22px;
  }

  .footer-bottom {
    padding: 14px 18px;
  }

  .error-main {
    padding: 48px 18px 56px;
  }

  .error-code {
    font-size: 36px;
  }

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

@media (max-width: 480px) {
  .hero-title {
    font-size: 23px;
  }

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

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

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

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

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

  .field-table {
    min-width: 460px;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
  }
}