/* ==========================================================================
   九九电影网 · 全站样式表
   分组：base / layout / components / pages / responsive
   ========================================================================== */

/* ==========================================================================
   base · 变量、重置、排版基线
   ========================================================================== */

:root {
  --color-bg: #F7F5F0;
  --color-ink: #1F1D1A;
  --color-ink-soft: #55504A;
  --color-primary: #2F4B7C;
  --color-primary-soft: #E7EBF3;
  --color-accent: #A65A2E;
  --color-line: #D8D2C6;
  --color-card: #FFFFFF;
  --color-fill: #EFEBE3;

  --font-sans: "Source Han Sans SC", "Noto Sans SC", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", "Heiti SC", Arial, sans-serif;

  --container: 1120px;
  --radius: 6px;
  --radius-sm: 4px;
  --gap: 24px;
  --shadow-card: 0 1px 2px rgba(31, 29, 26, 0.06);
}

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

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

body {
  margin: 0;
  background-color: var(--color-bg);
  color: var(--color-ink);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.75;
  font-weight: 400;
}

h1,
h2,
h3,
h4 {
  margin: 0;
  font-weight: 700;
  line-height: 1.35;
  color: var(--color-ink);
}

p {
  margin: 0 0 16px;
}

p:last-child {
  margin-bottom: 0;
}

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

dl,
dd,
dt,
figure,
figcaption {
  margin: 0;
}

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

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-primary);
  outline-offset: 2px;
}

button {
  font: inherit;
  color: inherit;
  cursor: pointer;
}

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

caption {
  text-align: left;
}

/* ==========================================================================
   layout · 页面骨架、容器、页头、页脚、主内容宽度
   ========================================================================== */

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 30;
  background-color: var(--color-bg);
  border-bottom: 1px solid var(--color-line);
}

.header-inner {
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: 14px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}

.site-nav {
  display: flex;
  align-items: center;
}

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

.home-main,
.inner-main,
.error-main {
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px 64px;
}

.site-footer {
  flex: 0 0 auto;
  background-color: var(--color-fill);
  border-top: 1px solid var(--color-line);
  color: var(--color-ink);
}

.footer-inner {
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: 44px 24px 28px;
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1fr;
  gap: 32px;
}

.footer-bottom {
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px 32px;
}

/* ==========================================================================
   components · 顶部信息条、品牌、主导航、按钮、通用标题、表格、卡片
   ========================================================================== */

/* 顶部信息条 */
.top-bar {
  background-color: var(--color-primary);
  color: #FFFFFF;
}

.top-bar-text {
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: 8px 24px;
  font-size: 14px;
  letter-spacing: 0.02em;
  line-height: 1.6;
}

/* 品牌标识 */
.brand {
  display: inline-flex;
  align-items: baseline;
  gap: 10px;
  color: var(--color-ink);
  flex: 0 0 auto;
}

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

.brand-mark {
  font-size: 20px;
  font-weight: 700;
  letter-spacing: 0.01em;
}

.brand-sub {
  font-size: 13px;
  color: var(--color-ink-soft);
  letter-spacing: 0.02em;
}

/* 主导航 */
.nav-toggle {
  display: none;
  align-items: center;
  gap: 8px;
  min-height: 44px;
  padding: 8px 12px;
  background-color: transparent;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-sm);
}

.nav-toggle-bar {
  width: 18px;
  height: 2px;
  background-color: var(--color-ink);
  position: relative;
}

.nav-toggle-bar::before,
.nav-toggle-bar::after {
  content: "";
  position: absolute;
  left: 0;
  width: 18px;
  height: 2px;
  background-color: var(--color-ink);
}

.nav-toggle-bar::before {
  top: -6px;
}

.nav-toggle-bar::after {
  top: 6px;
}

.nav-toggle-label {
  font-size: 14px;
  letter-spacing: 0.02em;
}

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

.nav-item {
  display: block;
}

.nav-link {
  display: block;
  padding: 10px 14px;
  font-size: 15px;
  color: var(--color-ink);
  border-bottom: 2px solid transparent;
  line-height: 1.5;
}

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

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

/* 按钮 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 10px 22px;
  border-radius: var(--radius-sm);
  font-size: 15px;
  font-weight: 700;
  border: 1px solid transparent;
  transition: background-color 0.18s ease, color 0.18s ease, border-color 0.18s ease;
}

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

.btn-primary:hover,
.btn-primary:focus-visible {
  background-color: #24395F;
  border-color: #24395F;
  color: #FFFFFF;
}

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

.btn-ghost:hover,
.btn-ghost:focus-visible {
  background-color: var(--color-primary-soft);
  color: var(--color-primary);
}

/* 通用区块标题 */
.section {
  padding: 48px 0 0;
}

.section-head {
  margin-bottom: 24px;
  max-width: 780px;
}

.section-title {
  font-size: 24px;
  margin-bottom: 10px;
}

.section-desc,
.section-intro {
  font-size: 15px;
  color: var(--color-ink-soft);
  line-height: 1.8;
}

.section-foot {
  margin-top: 18px;
  font-size: 15px;
}

.text-link {
  color: var(--color-primary);
  border-bottom: 1px solid var(--color-line);
  padding-bottom: 2px;
}

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

/* 数据表格 */
.table-wrap,
.category-table-wrap {
  width: 100%;
  overflow-x: auto;
  background-color: var(--color-card);
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
}

.data-table,
.category-table {
  min-width: 720px;
  font-size: 15px;
}

.table-caption,
.category-table-caption {
  padding: 14px 18px;
  font-size: 14px;
  color: var(--color-ink-soft);
  letter-spacing: 0.02em;
  border-bottom: 1px solid var(--color-line);
}

.data-table thead th,
.category-table thead th {
  text-align: left;
  padding: 12px 18px;
  font-size: 14px;
  letter-spacing: 0.02em;
  color: var(--color-ink-soft);
  background-color: var(--color-fill);
  border-bottom: 1px solid var(--color-line);
  white-space: nowrap;
}

.data-table tbody th,
.category-table tbody th {
  text-align: left;
  padding: 14px 18px;
  font-size: 15px;
  font-weight: 700;
  color: var(--color-ink);
  border-bottom: 1px solid var(--color-line);
  white-space: nowrap;
}

.data-table tbody td,
.category-table tbody td {
  padding: 14px 18px;
  color: var(--color-ink-soft);
  border-bottom: 1px solid var(--color-line);
  vertical-align: top;
}

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

.category-table tbody tr.category-row:hover th,
.category-table tbody tr.category-row:hover td,
.data-table tbody tr:hover th,
.data-table tbody tr:hover td {
  background-color: #FBF9F5;
}

/* 面包屑 */
.breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 20px 0 0;
  font-size: 14px;
  color: var(--color-ink-soft);
  letter-spacing: 0.02em;
}

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

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

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

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

/* 内页标题区 */
.page-header {
  padding: 20px 0 0;
  max-width: 820px;
}

.page-title {
  font-size: 34px;
  margin-bottom: 14px;
}

.page-description {
  font-size: 16px;
  color: var(--color-ink-soft);
  line-height: 1.8;
}

/* 图片容器通用约束 */
figure {
  overflow: hidden;
}

figure img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  background-color: var(--color-fill);
}

/* ==========================================================================
   components · 页脚
   ========================================================================== */

.footer-brand {
  max-width: 320px;
}

.footer-name {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 8px;
}

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

.footer-title {
  font-size: 15px;
  margin-bottom: 12px;
  color: var(--color-ink);
  letter-spacing: 0.02em;
}

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

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

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

.footer-copy {
  font-size: 13px;
  color: var(--color-ink-soft);
  border-top: 1px solid var(--color-line);
  padding-top: 18px;
  margin: 0;
}

/* ==========================================================================
   pages · 首页
   ========================================================================== */

/* 首屏 */
.hero {
  padding: 44px 0 0;
}

.hero-inner {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 40px;
  align-items: start;
}

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

.hero-eyebrow {
  font-size: 14px;
  letter-spacing: 0.02em;
  color: var(--color-accent);
  margin-bottom: 12px;
}

.hero-title {
  font-size: 34px;
  margin-bottom: 16px;
}

.hero-lead {
  font-size: 16px;
  color: var(--color-ink-soft);
  line-height: 1.85;
  max-width: 560px;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin: 22px 0 16px;
}

.hero-note {
  font-size: 14px;
  color: var(--color-ink-soft);
  letter-spacing: 0.02em;
  border-left: 3px solid var(--color-line);
  padding-left: 12px;
}

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

.hero-figure {
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  background-color: var(--color-card);
  overflow: hidden;
}

.hero-figure img {
  width: 100%;
  height: 320px;
  object-fit: cover;
}

.figure-caption {
  padding: 12px 16px;
  font-size: 14px;
  color: var(--color-ink-soft);
  letter-spacing: 0.02em;
  border-top: 1px solid var(--color-line);
}

/* 场景入口 */
.scene-entries {
  margin-top: 32px;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--gap);
}

.scene-card {
  background-color: var(--color-card);
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  padding: 20px;
  box-shadow: var(--shadow-card);
  display: flex;
  flex-direction: column;
  transition: border-color 0.18s ease, background-color 0.18s ease;
}

.scene-card:hover {
  border-color: var(--color-primary);
  background-color: #FCFBF8;
}

.scene-title {
  font-size: 18px;
  margin-bottom: 8px;
}

.scene-desc {
  font-size: 14px;
  color: var(--color-ink-soft);
  line-height: 1.8;
  flex: 1 1 auto;
}

.scene-link {
  margin-top: 14px;
  font-size: 15px;
  font-weight: 700;
  color: var(--color-primary);
}

.scene-link::after {
  content: " →";
  font-weight: 400;
}

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

/* 分类目录总览 */
.category-overview .section-head {
  max-width: 820px;
}

/* 专题合集入口 */
.collection-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--gap);
}

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

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

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

.card-media img {
  width: 100%;
  height: 200px;
  object-fit: cover;
}

.card-body {
  padding: 18px 20px 20px;
  display: flex;
  flex-direction: column;
  flex: 1 1 auto;
}

.card-title {
  font-size: 18px;
  margin-bottom: 12px;
}

.card-field {
  font-size: 14px;
  color: var(--color-ink-soft);
  line-height: 1.8;
  margin-bottom: 8px;
}

.card-field .field-label {
  display: inline-block;
  min-width: 68px;
  margin-right: 6px;
  color: var(--color-accent);
  letter-spacing: 0.02em;
}

.card-link {
  margin-top: auto;
  padding-top: 12px;
  font-size: 15px;
  font-weight: 700;
  color: var(--color-primary);
}

.card-link::after {
  content: " →";
  font-weight: 400;
}

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

/* 更新记录 */
.log-groups {
  display: grid;
  gap: 16px;
}

.log-group {
  background-color: var(--color-card);
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  overflow: hidden;
}

.log-month {
  margin: 0;
  font-size: 18px;
}

.log-toggle {
  width: 100%;
  min-height: 48px;
  padding: 14px 20px;
  text-align: left;
  background-color: var(--color-fill);
  border: 0;
  border-bottom: 1px solid var(--color-line);
  font-size: 16px;
  font-weight: 700;
  letter-spacing: 0.02em;
  position: relative;
}

.log-toggle::after {
  content: "−";
  position: absolute;
  right: 20px;
  top: 50%;
  transform: translateY(-50%);
  font-weight: 400;
  color: var(--color-ink-soft);
}

.log-toggle[aria-expanded="false"]::after {
  content: "+";
}

.log-toggle:hover,
.log-toggle:focus-visible {
  color: var(--color-primary);
}

.log-list {
  padding: 6px 20px 12px;
}

.log-item {
  display: grid;
  grid-template-columns: 108px 96px minmax(0, 1fr);
  gap: 12px;
  align-items: baseline;
  padding: 12px 0;
  border-bottom: 1px solid var(--color-line);
  font-size: 15px;
}

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

.log-date {
  font-size: 14px;
  color: var(--color-ink-soft);
  letter-spacing: 0.02em;
}

.log-type {
  font-size: 14px;
  color: var(--color-accent);
  letter-spacing: 0.02em;
}

.log-text {
  color: var(--color-ink);
  line-height: 1.75;
  min-width: 0;
}

/* 字段说明与浏览指引摘要 */
.summary-columns {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--gap);
}

.summary-col {
  background-color: var(--color-card);
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  padding: 22px;
  min-width: 0;
}

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

.field-list {
  margin: 0;
}

.field-col .field-list {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 0 14px;
}

.field-term {
  font-size: 14px;
  font-weight: 700;
  color: var(--color-accent);
  letter-spacing: 0.02em;
  padding: 10px 0;
  border-top: 1px solid var(--color-line);
  min-width: 84px;
}

.field-def {
  font-size: 14px;
  color: var(--color-ink-soft);
  line-height: 1.8;
  padding: 10px 0;
  border-top: 1px solid var(--color-line);
  min-width: 0;
}

.field-col .field-list .field-term:first-of-type,
.field-col .field-list .field-def:first-of-type {
  border-top: 0;
}

.clue-list {
  margin-bottom: 16px;
}

.clue-item {
  font-size: 14px;
  color: var(--color-ink-soft);
  line-height: 1.8;
  padding: 10px 0;
  border-top: 1px solid var(--color-line);
}

.clue-item:first-child {
  border-top: 0;
}

.clue-name {
  display: block;
  color: var(--color-ink);
  font-size: 15px;
  margin-bottom: 2px;
}

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

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

.index-title {
  font-size: 18px;
  margin-bottom: 8px;
}

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

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

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

/* ==========================================================================
   pages · 影片分类
   ========================================================================== */

.category-visual {
  padding-top: 36px;
}

.category-visual .section-title {
  margin-bottom: 10px;
}

.category-visual .section-desc {
  margin-bottom: 20px;
}

.category-figure {
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  background-color: var(--color-card);
}

.category-figure img {
  width: 100%;
  height: 300px;
  object-fit: cover;
}

.category-figure-caption {
  padding: 12px 18px;
  font-size: 14px;
  color: var(--color-ink-soft);
  letter-spacing: 0.02em;
  border-top: 1px solid var(--color-line);
}

.category-table-section {
  padding-top: 44px;
}

.category-table-section .section-title,
.field-glossary .section-title,
.browse-path .section-title,
.related-module .section-title {
  margin-bottom: 10px;
}

.category-table-section .section-desc,
.field-glossary .section-desc,
.browse-path .section-desc,
.related-module .section-desc {
  margin-bottom: 20px;
}

.category-table-note {
  margin-top: 16px;
  font-size: 14px;
  color: var(--color-ink-soft);
}

/* 字段含义说明 */
.field-glossary {
  padding-top: 44px;
}

.glossary-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0 32px;
  background-color: var(--color-card);
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  padding: 8px 24px;
}

.glossary-item {
  display: grid;
  grid-template-columns: 96px minmax(0, 1fr);
  gap: 14px;
  padding: 16px 0;
  border-bottom: 1px solid var(--color-line);
}

.glossary-term {
  font-size: 14px;
  font-weight: 700;
  color: var(--color-accent);
  letter-spacing: 0.02em;
}

.glossary-desc {
  font-size: 14px;
  color: var(--color-ink-soft);
  line-height: 1.8;
  min-width: 0;
}

/* 分类入口与浏览路径 */
.browse-path {
  padding-top: 44px;
}

.path-list {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--gap);
  counter-reset: path;
}

.path-item {
  background-color: var(--color-card);
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  padding: 20px;
  min-width: 0;
  position: relative;
}

.path-item::before {
  counter-increment: path;
  content: counter(path, decimal-leading-zero);
  display: block;
  font-size: 14px;
  letter-spacing: 0.02em;
  color: var(--color-accent);
  margin-bottom: 8px;
}

.path-title {
  font-size: 18px;
  margin-bottom: 8px;
}

.path-desc {
  font-size: 14px;
  color: var(--color-ink-soft);
  line-height: 1.8;
  margin: 0;
}

/* 页尾关联模块 */
.related-module {
  padding-top: 44px;
}

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

.related-card {
  background-color: var(--color-card);
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  padding: 20px;
  min-width: 0;
}

.related-card-title {
  font-size: 18px;
  margin-bottom: 8px;
}

.related-card-title a {
  color: var(--color-ink);
}

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

.related-card-desc {
  font-size: 14px;
  color: var(--color-ink-soft);
  line-height: 1.8;
  margin: 0;
}

/* ==========================================================================
   pages · 专题合集
   ========================================================================== */

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

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

.collection-figure img {
  width: 100%;
  height: 210px;
  object-fit: cover;
}

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

.collection-name {
  font-size: 18px;
  margin-bottom: 12px;
}

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

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

.collection-scope,
.collection-rule,
.collection-order {
  font-size: 14px;
  color: var(--color-ink-soft);
  line-height: 1.8;
  margin-bottom: 8px;
}

.collection-order {
  margin-bottom: 0;
}

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

.relation-item {
  background-color: var(--color-card);
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  padding: 20px;
  min-width: 0;
}

.relation-heading {
  font-size: 18px;
  margin-bottom: 8px;
}

.relation-item p {
  font-size: 14px;
  color: var(--color-ink-soft);
  line-height: 1.8;
  margin: 0;
}

.order-list {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--gap);
  counter-reset: order;
}

.order-item {
  background-color: var(--color-card);
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  padding: 20px;
  min-width: 0;
}

.order-item::before {
  counter-increment: order;
  content: counter(order, decimal-leading-zero);
  display: block;
  font-size: 14px;
  letter-spacing: 0.02em;
  color: var(--color-accent);
  margin-bottom: 8px;
}

.order-heading {
  font-size: 18px;
  margin-bottom: 8px;
}

.order-item p {
  font-size: 14px;
  color: var(--color-ink-soft);
  line-height: 1.8;
  margin: 0;
}

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

.related-list .related-item {
  background-color: var(--color-card);
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  padding: 16px 20px;
  min-width: 0;
}

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

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

/* ==========================================================================
   pages · 浏览指引
   ========================================================================== */

.page-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 320px;
  gap: 40px;
  align-items: start;
  padding-top: 36px;
}

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

.layout-aside {
  min-width: 0;
  background-color: var(--color-card);
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  padding: 22px;
  position: sticky;
  top: 88px;
}

.aside-title {
  font-size: 18px;
  margin-bottom: 10px;
}

.aside-intro {
  font-size: 14px;
  color: var(--color-ink-soft);
  line-height: 1.8;
  margin-bottom: 16px;
}

.check-list {
  counter-reset: check;
}

.check-item {
  padding: 12px 0;
  border-top: 1px solid var(--color-line);
}

.check-item:first-child {
  border-top: 0;
  padding-top: 0;
}

.check-label {
  display: block;
  font-size: 14px;
  font-weight: 700;
  color: var(--color-accent);
  letter-spacing: 0.02em;
  margin-bottom: 4px;
}

.check-text {
  font-size: 14px;
  color: var(--color-ink-soft);
  line-height: 1.8;
  margin: 0;
}

.guide-tracks,
.guide-fields,
.guide-faq {
  margin-bottom: 40px;
}

.guide-tracks .section-title,
.guide-fields .section-title,
.guide-faq .section-title {
  margin-bottom: 10px;
}

.guide-tracks .section-intro,
.guide-fields .section-intro,
.guide-faq .section-intro {
  margin-bottom: 18px;
}

.track-table {
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  overflow: hidden;
  background-color: var(--color-card);
}

.track-row {
  display: grid;
  grid-template-columns: 160px minmax(0, 1fr) minmax(0, 1fr);
  border-bottom: 1px solid var(--color-line);
}

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

.track-head {
  background-color: var(--color-fill);
}

.track-cell {
  padding: 14px 18px;
  font-size: 14px;
  color: var(--color-ink-soft);
  line-height: 1.75;
  min-width: 0;
}

.track-head .track-cell {
  font-size: 14px;
  letter-spacing: 0.02em;
  color: var(--color-ink);
  font-weight: 700;
}

.track-name {
  font-weight: 700;
  color: var(--color-ink);
}

.guide-figure {
  margin-top: 20px;
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  background-color: var(--color-card);
}

.guide-figure img {
  width: 100%;
  height: 240px;
  object-fit: cover;
}

.guide-figure figcaption {
  padding: 12px 18px;
  font-size: 14px;
  color: var(--color-ink-soft);
  letter-spacing: 0.02em;
  border-top: 1px solid var(--color-line);
}

.guide-fields .field-list {
  display: grid;
  gap: 0;
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  background-color: var(--color-card);
  overflow: hidden;
}

.guide-fields .field-item {
  padding: 18px 20px;
  border-bottom: 1px solid var(--color-line);
}

.guide-fields .field-item:last-child {
  border-bottom: 0;
}

.guide-fields .field-name {
  font-size: 18px;
  margin-bottom: 6px;
}

.guide-fields .field-meaning {
  font-size: 15px;
  color: var(--color-ink);
  line-height: 1.8;
  margin-bottom: 6px;
}

.guide-fields .field-example {
  font-size: 14px;
  color: var(--color-ink-soft);
  line-height: 1.8;
  margin: 0;
}

.faq-item {
  background-color: var(--color-card);
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  margin-bottom: 12px;
  overflow: hidden;
}

.faq-question {
  padding: 16px 20px;
  font-size: 16px;
  font-weight: 700;
  cursor: pointer;
  list-style: none;
  position: relative;
  padding-right: 48px;
}

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

.faq-question::after {
  content: "+";
  position: absolute;
  right: 20px;
  top: 50%;
  transform: translateY(-50%);
  font-weight: 400;
  color: var(--color-ink-soft);
}

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

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

.faq-answer {
  padding: 0 20px 18px;
  border-top: 1px solid var(--color-line);
  padding-top: 14px;
}

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

.related-block {
  padding-top: 44px;
}

.related-block .section-title {
  margin-bottom: 10px;
}

.related-block .section-intro {
  margin-bottom: 18px;
}

.related-block .related-list {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

/* ==========================================================================
   pages · 内容反馈
   ========================================================================== */

.feedback-scope {
  padding-top: 36px;
}

.feedback-scope .section-title,
.feedback-detail .section-title,
.feedback-handle .section-title,
.feedback-related .section-title {
  margin-bottom: 10px;
}

.feedback-scope .section-desc,
.feedback-detail .section-desc,
.feedback-handle .section-desc,
.feedback-related .section-desc {
  margin-bottom: 20px;
}

.scope-figure {
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  background-color: var(--color-card);
  margin-bottom: 24px;
}

.scope-figure img {
  width: 100%;
  height: 260px;
  object-fit: cover;
}

.scope-figure figcaption {
  padding: 12px 18px;
  font-size: 14px;
  color: var(--color-ink-soft);
  letter-spacing: 0.02em;
  border-top: 1px solid var(--color-line);
}

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

.scope-col {
  background-color: var(--color-card);
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  padding: 22px;
  min-width: 0;
}

.scope-col-title {
  font-size: 18px;
  margin-bottom: 12px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--color-line);
}

.scope-col-can .scope-col-title {
  color: var(--color-primary);
}

.scope-col-cannot .scope-col-title {
  color: var(--color-accent);
}

.scope-item {
  font-size: 15px;
  color: var(--color-ink-soft);
  line-height: 1.8;
  padding: 10px 0 10px 22px;
  position: relative;
  border-bottom: 1px solid var(--color-line);
}

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

.scope-item::before {
  content: "";
  position: absolute;
  left: 4px;
  top: 20px;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background-color: var(--color-line);
}

.scope-col-can .scope-item::before {
  background-color: var(--color-primary);
}

.scope-col-cannot .scope-item::before {
  background-color: var(--color-accent);
}

.feedback-detail {
  padding-top: 44px;
}

.detail-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0 32px;
  background-color: var(--color-card);
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  padding: 8px 24px;
}

.detail-item {
  padding: 16px 0;
  border-bottom: 1px solid var(--color-line);
  min-width: 0;
}

.detail-name {
  font-size: 16px;
  margin-bottom: 6px;
}

.detail-text {
  font-size: 14px;
  color: var(--color-ink-soft);
  line-height: 1.8;
  margin: 0;
}

.feedback-handle {
  padding-top: 44px;
}

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

.handle-item {
  background-color: var(--color-card);
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  padding: 20px;
  min-width: 0;
}

.handle-name {
  font-size: 18px;
  margin-bottom: 8px;
}

.handle-text {
  font-size: 14px;
  color: var(--color-ink-soft);
  line-height: 1.8;
  margin: 0;
}

.feedback-related {
  padding-top: 44px;
}

.related-links {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: var(--gap);
}

.related-links .related-item {
  background-color: var(--color-card);
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  padding: 16px 20px;
  min-width: 0;
}

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

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

/* ==========================================================================
   pages · 404
   ========================================================================== */

.error-main {
  display: flex;
  align-items: center;
  justify-content: center;
  padding-top: 64px;
  padding-bottom: 80px;
}

.error-panel {
  width: 100%;
  max-width: 640px;
  background-color: var(--color-card);
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  padding: 40px 36px;
  text-align: left;
}

.error-code {
  font-size: 14px;
  letter-spacing: 0.02em;
  color: var(--color-accent);
  margin-bottom: 10px;
}

.error-title {
  font-size: 34px;
  margin-bottom: 14px;
}

.error-text {
  font-size: 16px;
  color: var(--color-ink-soft);
  line-height: 1.85;
  margin-bottom: 22px;
}

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

.error-links {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
  border-top: 1px solid var(--color-line);
  padding-top: 20px;
}

.error-links .related-item,
.error-links li {
  min-width: 0;
}

.error-links a {
  display: block;
  font-size: 14px;
  color: var(--color-primary);
  padding: 10px 12px;
  background-color: var(--color-fill);
  border-radius: var(--radius-sm);
  min-height: 44px;
  line-height: 1.7;
}

.error-links a:hover,
.error-links a:focus-visible {
  background-color: var(--color-primary-soft);
  color: var(--color-primary);
}

/* ==========================================================================
   responsive · 900px 断点
   ========================================================================== */

@media (max-width: 900px) {

  .header-inner {
    padding: 12px 20px;
    flex-wrap: wrap;
  }

  .nav-toggle {
    display: inline-flex;
  }

  .site-nav {
    width: 100%;
    display: block;
  }

  .nav-list {
    display: none;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    width: 100%;
    padding: 8px 0 4px;
    border-top: 1px solid var(--color-line);
  }

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

  .nav-link {
    padding: 12px 4px;
    border-bottom: 1px solid var(--color-line);
  }

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

  .home-main,
  .inner-main,
  .error-main {
    padding: 0 20px 56px;
  }

  .hero {
    padding-top: 32px;
  }

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

  .hero-title {
    font-size: 30px;
  }

  .hero-lead {
    max-width: none;
  }

  .hero-figure img {
    height: 260px;
  }

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

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

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

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

  .page-title {
    font-size: 30px;
  }

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

  .path-list,
  .related-grid,
  .relation-grid,
  .order-list,
  .handle-list {
    grid-template-columns: minmax(0, 1fr);
  }

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

  .page-layout {
    grid-template-columns: minmax(0, 1fr);
    gap: 32px;
  }

  .layout-aside {
    position: static;
  }

  .track-row {
    grid-template-columns: 120px minmax(0, 1fr);
  }

  .track-row .track-cell:nth-child(3) {
    grid-column: 1 / -1;
    border-top: 1px solid var(--color-line);
  }

  .track-head .track-cell:nth-child(3) {
    border-top: 0;
  }

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

  .detail-list {
    grid-template-columns: minmax(0, 1fr);
    padding: 8px 20px;
  }

  .footer-inner {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 28px;
    padding: 36px 20px 24px;
  }

  .footer-brand {
    max-width: none;
    grid-column: 1 / -1;
  }

  .footer-bottom {
    padding: 0 20px 28px;
  }
}

/* ==========================================================================
   responsive · 600px 断点
   ========================================================================== */

@media (max-width: 600px) {

  body {
    font-size: 15px;
  }

  .top-bar-text {
    padding: 8px 16px;
    font-size: 13px;
  }

  .header-inner {
    padding: 10px 16px;
  }

  .brand-mark {
    font-size: 18px;
  }

  .brand-sub {
    font-size: 12px;
  }

  .home-main,
  .inner-main,
  .error-main {
    padding: 0 16px 48px;
  }

  .hero {
    padding-top: 24px;
  }

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

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

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

  .hero-figure img {
    height: 200px;
  }

  .section {
    padding-top: 36px;
  }

  .section-title,
  .card-title,
  .scene-title,
  .col-title,
  .index-title,
  .path-title,
  .related-card-title,
  .collection-name,
  .relation-heading,
  .order-heading,
  .aside-title,
  .guide-fields .field-name,
  .scope-col-title,
  .handle-name {
    font-size: 18px;
  }

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

  .log-date,
  .log-type {
    display: inline;
    margin-right: 10px;
  }

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

  .field-term {
    padding-bottom: 0;
  }

  .field-def {
    border-top: 0;
    padding-top: 2px;
  }

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

  .category-figure img,
  .scope-figure img,
  .guide-figure img {
    height: 190px;
  }

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

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

  .track-row .track-cell:nth-child(3) {
    grid-column: auto;
    border-top: 0;
  }

  .track-head {
    display: none;
  }

  .track-cell {
    padding: 10px 16px;
  }

  .track-name {
    background-color: var(--color-fill);
    border-bottom: 1px solid var(--color-line);
  }

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

  .error-panel {
    padding: 28px 20px;
  }

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

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