:root {
  --color-primary: #1f3a5f;
  --color-primary-dark: #16293f;
  --color-accent: #e07b39;
  --color-accent-dark: #c4652a;
  --color-bg: #f7f8fa;
  --color-card: #ffffff;
  --color-text: #2b2f36;
  --color-muted: #6b7280;
  --color-line: #e3e6eb;
  --color-line-strong: #ccd2db;
  --radius-sm: 4px;
  --radius-md: 6px;
  --radius-lg: 8px;
  --shadow-card: 0 1px 2px rgba(31, 58, 95, 0.06), 0 6px 18px rgba(31, 58, 95, 0.05);
  --shadow-hover: 0 2px 6px rgba(31, 58, 95, 0.10), 0 12px 26px rgba(31, 58, 95, 0.08);
  --container: 1120px;
  --header-height: 68px;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
}

/* ==========================================================================
   base —— 全站基础重置与排版
   ========================================================================== */

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

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

body.site-body {
  margin: 0;
  padding: 0;
  background-color: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.75;
  font-weight: 400;
  -webkit-font-smoothing: antialiased;
}

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

p {
  margin: 0;
}

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

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

a:hover {
  color: var(--color-accent-dark);
}

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

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

button {
  font-family: inherit;
  font-size: inherit;
  color: inherit;
}

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

/* ==========================================================================
   layout —— 全站骨架：页头、导航、主容器、页脚
   ========================================================================== */

.site-header {
  position: sticky;
  top: 0;
  z-index: 60;
  background-color: var(--color-card);
  border-bottom: 1px solid var(--color-line);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  width: 100%;
  max-width: var(--container);
  min-height: var(--header-height);
  margin: 0 auto;
  padding: 0 24px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  min-height: 44px;
  color: var(--color-primary);
  font-weight: 600;
}

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

.brand-mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 34px;
  height: 34px;
  border-radius: var(--radius-md);
  background-color: var(--color-primary);
  color: #ffffff;
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0;
}

.brand-sub {
  font-size: 17px;
  font-weight: 600;
  white-space: nowrap;
}

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

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

.nav-list > li {
  display: block;
}

.nav-link {
  display: flex;
  align-items: center;
  min-height: 44px;
  padding: 6px 14px;
  border-radius: var(--radius-sm);
  color: var(--color-text);
  font-size: 15px;
  font-weight: 500;
  white-space: nowrap;
}

.nav-link:hover {
  color: var(--color-primary);
  background-color: #eef2f7;
}

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

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

.nav-toggle:hover {
  border-color: var(--color-primary);
}

.nav-toggle-bar {
  display: block;
  width: 20px;
  height: 2px;
  background-color: var(--color-primary);
}

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

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

.breadcrumb {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 18px;
  font-size: 14px;
  color: var(--color-muted);
}

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

.breadcrumb a:hover {
  color: var(--color-primary);
  text-decoration: underline;
}

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

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

.page-header {
  margin-bottom: 32px;
  padding-bottom: 22px;
  border-bottom: 1px solid var(--color-line);
}

.page-title {
  font-size: 30px;
  font-weight: 600;
  color: var(--color-primary);
}

.page-description {
  margin-top: 12px;
  max-width: 860px;
  font-size: 15px;
  color: var(--color-muted);
}

.page-description a {
  color: var(--color-primary);
  border-bottom: 1px solid var(--color-line-strong);
}

.page-description a:hover {
  color: var(--color-accent-dark);
  border-bottom-color: var(--color-accent);
}

.site-footer {
  background-color: #16283f;
  color: #c6d0dd;
  font-size: 14px;
}

.footer-inner {
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: 44px 24px 28px;
}

.footer-groups {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 28px 32px;
  padding-bottom: 30px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.12);
}

.footer-title {
  margin-bottom: 12px;
  color: #ffffff;
  font-size: 15px;
  font-weight: 600;
}

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

.footer-list a {
  display: inline-block;
  min-height: 24px;
  color: #b3c0d1;
  font-size: 14px;
}

.footer-list a:hover {
  color: #ffffff;
  text-decoration: underline;
}

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

.footer-brand {
  color: #ffffff;
  font-size: 15px;
  font-weight: 600;
}

.footer-note,
.footer-copy {
  margin-top: 8px;
  max-width: 900px;
  color: #9aa8bb;
  font-size: 13px;
  line-height: 1.7;
}

/* ==========================================================================
   components —— 通用按钮、标题组、表格、卡片、链接
   ========================================================================== */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 10px 22px;
  border: 1px solid transparent;
  border-radius: var(--radius-md);
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  transition: background-color 0.18s ease, color 0.18s ease, border-color 0.18s ease;
}

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

.btn-primary:hover {
  background-color: var(--color-primary-dark);
  border-color: var(--color-primary-dark);
  color: #ffffff;
}

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

.btn-ghost:hover {
  border-color: var(--color-primary);
  background-color: #eef2f7;
  color: var(--color-primary);
}

.section {
  padding: 52px 0;
}

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

.section-head {
  max-width: 820px;
  margin-bottom: 26px;
}

.section-title {
  font-size: 22px;
  font-weight: 600;
  color: var(--color-primary);
}

.section-desc,
.section-lead {
  margin-top: 10px;
  font-size: 15px;
  color: var(--color-muted);
}

.subsection-title {
  font-size: 17px;
  font-weight: 600;
  color: var(--color-primary);
}

.section-foot {
  margin-top: 18px;
  font-size: 14px;
}

.text-link {
  display: inline-block;
  min-height: 24px;
  color: var(--color-primary);
  font-weight: 500;
  border-bottom: 1px solid var(--color-line-strong);
}

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

.table-scroll {
  width: 100%;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.channel-table-wrap {
  width: 100%;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  background-color: var(--color-card);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-lg);
}

.channel-table {
  min-width: 720px;
  font-size: 14px;
}

.channel-table thead th {
  padding: 14px 16px;
  background-color: #eef2f7;
  border-bottom: 1px solid var(--color-line);
  color: var(--color-primary);
  font-size: 14px;
  font-weight: 600;
  text-align: left;
  white-space: nowrap;
}

.channel-table tbody th {
  padding: 16px;
  border-bottom: 1px solid var(--color-line);
  color: var(--color-primary);
  font-size: 15px;
  font-weight: 600;
  text-align: left;
  vertical-align: top;
  white-space: nowrap;
}

.channel-table tbody td {
  padding: 16px;
  border-bottom: 1px solid var(--color-line);
  color: var(--color-text);
  font-size: 14px;
  vertical-align: top;
  line-height: 1.7;
}

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

.channel-table tbody tr:hover th,
.channel-table tbody tr:hover td {
  background-color: #f2f5f9;
}

.field-table {
  min-width: 560px;
  background-color: var(--color-card);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-lg);
  font-size: 14px;
}

.field-table caption {
  padding: 0 0 12px;
  color: var(--color-muted);
  font-size: 14px;
  text-align: left;
}

.field-table thead th {
  padding: 13px 16px;
  background-color: #eef2f7;
  border-bottom: 1px solid var(--color-line);
  color: var(--color-primary);
  font-size: 14px;
  font-weight: 600;
  text-align: left;
  white-space: nowrap;
}

.field-table tbody th {
  padding: 14px 16px;
  border-bottom: 1px solid var(--color-line);
  color: var(--color-primary);
  font-size: 14px;
  font-weight: 600;
  text-align: left;
  vertical-align: top;
  white-space: nowrap;
}

.field-table tbody td {
  padding: 14px 16px;
  border-bottom: 1px solid var(--color-line);
  color: var(--color-text);
  font-size: 14px;
  vertical-align: top;
  line-height: 1.7;
}

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

/* ==========================================================================
   pages —— 首页
   ========================================================================== */

.home-main {
  display: block;
}

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

.hero-inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  align-items: center;
  gap: 44px;
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: 56px 24px 60px;
}

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

.hero-eyebrow {
  display: inline-block;
  margin-bottom: 14px;
  padding: 4px 12px;
  border-radius: var(--radius-sm);
  background-color: #fdeee2;
  color: var(--color-accent-dark);
  font-size: 13px;
  font-weight: 600;
}

.hero-title {
  font-size: 34px;
  font-weight: 600;
  line-height: 1.35;
  color: var(--color-primary);
}

.hero-lead {
  margin-top: 16px;
  max-width: 560px;
  font-size: 16px;
  color: var(--color-muted);
}

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

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

.hero-media img {
  width: 100%;
  height: 340px;
  object-fit: cover;
  border-radius: var(--radius-lg);
  background-color: #eef2f7;
}

.hero-media figcaption {
  margin-top: 10px;
  color: var(--color-muted);
  font-size: 13px;
  line-height: 1.6;
}

.section-channels {
  padding-top: 56px;
}

.section-collections .collection-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 20px;
}

.collection-card {
  display: flex;
  flex-direction: column;
  min-width: 0;
  padding: 22px;
  background-color: var(--color-card);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card);
  transition: box-shadow 0.2s ease, border-color 0.2s ease;
}

.collection-card:hover {
  border-color: var(--color-line-strong);
  box-shadow: var(--shadow-hover);
}

.collection-name {
  font-size: 17px;
  font-weight: 600;
  color: var(--color-primary);
}

.collection-theme {
  margin-top: 10px;
  font-size: 14px;
  color: var(--color-text);
  line-height: 1.7;
}

.collection-scope {
  margin-top: 10px;
  padding-top: 10px;
  border-top: 1px dashed var(--color-line);
  font-size: 14px;
  color: var(--color-muted);
  line-height: 1.7;
}

.collection-link {
  display: inline-flex;
  align-items: center;
  align-self: flex-start;
  min-height: 44px;
  margin-top: auto;
  padding-top: 14px;
  color: var(--color-primary);
  font-size: 14px;
  font-weight: 600;
  border-bottom: 1px solid transparent;
}

.collection-link:hover {
  color: var(--color-accent-dark);
  border-bottom-color: var(--color-accent);
}

.section-media {
  margin: 28px 0 0;
}

.section-media img {
  width: 100%;
  height: 240px;
  object-fit: cover;
  border-radius: var(--radius-lg);
  background-color: #eef2f7;
}

.section-media figcaption {
  margin-top: 10px;
  color: var(--color-muted);
  font-size: 13px;
}

.fields-layout {
  display: grid;
  grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr);
  gap: 32px;
  align-items: start;
}

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

.fields-table-col .subsection-title {
  margin-bottom: 14px;
}

.fields-side {
  min-width: 0;
  padding: 22px;
  background-color: var(--color-card);
  border: 1px solid var(--color-line);
  border-left: 3px solid var(--color-accent);
  border-radius: var(--radius-lg);
}

.fields-side .subsection-title {
  margin-bottom: 12px;
}

.boundary-list li {
  position: relative;
  padding-left: 18px;
  font-size: 14px;
  color: var(--color-text);
  line-height: 1.75;
}

.boundary-list li + li {
  margin-top: 12px;
}

.boundary-list li::before {
  content: "";
  position: absolute;
  top: 11px;
  left: 2px;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background-color: var(--color-accent);
}

.path-steps {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 20px;
}

.path-step {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  min-width: 0;
  padding: 22px;
  background-color: var(--color-card);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-lg);
}

.step-no {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex: 0 0 auto;
  width: 32px;
  height: 32px;
  border-radius: var(--radius-sm);
  background-color: var(--color-primary);
  color: #ffffff;
  font-size: 15px;
  font-weight: 600;
}

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

.step-title {
  font-size: 17px;
  font-weight: 600;
  color: var(--color-primary);
}

.path-step .step-body > p {
  margin-top: 8px;
  font-size: 14px;
  color: var(--color-muted);
  line-height: 1.75;
}

.path-step .step-body > p a {
  color: var(--color-primary);
  font-weight: 500;
  border-bottom: 1px solid var(--color-line-strong);
}

.path-step .step-body > p a:hover {
  color: var(--color-accent-dark);
  border-bottom-color: var(--color-accent);
}

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

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

.index-card:hover {
  border-color: var(--color-line-strong);
  box-shadow: var(--shadow-card);
}

.index-name {
  font-size: 16px;
  font-weight: 600;
}

.index-name a {
  display: inline-block;
  min-height: 24px;
  color: var(--color-primary);
}

.index-name a:hover {
  color: var(--color-accent-dark);
  text-decoration: underline;
}

.index-card > p {
  margin-top: 10px;
  font-size: 14px;
  color: var(--color-muted);
  line-height: 1.7;
}

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

.channel-overview {
  margin-bottom: 48px;
}

.channel-overview .section-lead {
  margin-bottom: 20px;
}

.channel-detail {
  margin-bottom: 48px;
}

.channel-detail .section-lead {
  margin-bottom: 20px;
}

.channel-figure {
  margin: 0 0 28px;
}

.channel-figure img {
  width: 100%;
  height: 280px;
  object-fit: cover;
  border-radius: var(--radius-lg);
  background-color: #eef2f7;
}

.channel-figure figcaption {
  margin-top: 10px;
  color: var(--color-muted);
  font-size: 13px;
}

.channel-articles {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20px;
}

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

.channel-article:last-child:nth-child(odd) {
  grid-column: 1 / -1;
}

.channel-name {
  font-size: 17px;
  font-weight: 600;
  color: var(--color-primary);
}

.channel-text {
  margin-top: 10px;
  font-size: 14px;
  color: var(--color-text);
  line-height: 1.75;
}

.channel-text + .channel-text {
  margin-top: 8px;
  color: var(--color-muted);
}

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

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

.advice-title {
  font-size: 17px;
  font-weight: 600;
  color: var(--color-primary);
}

.advice-list {
  margin-top: 14px;
}

.advice-list li {
  position: relative;
  padding-left: 18px;
  font-size: 14px;
  color: var(--color-text);
  line-height: 1.75;
}

.advice-list li + li {
  margin-top: 10px;
}

.advice-list li::before {
  content: "";
  position: absolute;
  top: 11px;
  left: 2px;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background-color: var(--color-primary);
}

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

.collections-overview {
  margin-bottom: 48px;
}

.collections-overview .section-lead {
  margin-bottom: 20px;
}

.collection-cards {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 20px;
}

.collections-overview .collection-card {
  padding: 0;
  overflow: hidden;
}

.collection-media {
  margin: 0;
}

.collection-media img {
  width: 100%;
  height: 168px;
  object-fit: cover;
  background-color: #eef2f7;
}

.collection-body {
  display: flex;
  flex-direction: column;
  flex: 1 1 auto;
  min-width: 0;
  padding: 18px 20px 20px;
}

.collection-meta {
  margin: 12px 0 0;
}

.collection-meta dt {
  color: var(--color-accent-dark);
  font-size: 13px;
  font-weight: 600;
}

.collection-meta dd {
  margin: 4px 0 0;
  font-size: 14px;
  color: var(--color-text);
  line-height: 1.7;
}

.collection-meta dd + dt {
  margin-top: 12px;
}

.collections-notes {
  margin-bottom: 48px;
}

.collections-notes .section-lead {
  margin-bottom: 20px;
}

.note-item {
  padding: 20px 22px;
  background-color: var(--color-card);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-lg);
}

.note-item + .note-item {
  margin-top: 16px;
}

.note-name {
  font-size: 17px;
  font-weight: 600;
  color: var(--color-primary);
}

.note-text {
  margin-top: 10px;
  font-size: 14px;
  color: var(--color-text);
  line-height: 1.75;
}

.note-boundary {
  margin-top: 10px;
  padding-top: 10px;
  border-top: 1px dashed var(--color-line);
  font-size: 14px;
  color: var(--color-muted);
  line-height: 1.75;
}

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

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

.usage-heading {
  font-size: 17px;
  font-weight: 600;
  color: var(--color-primary);
}

.usage-text {
  margin-top: 10px;
  font-size: 14px;
  color: var(--color-text);
  line-height: 1.75;
}

.usage-list {
  margin-top: 14px;
}

.usage-list li {
  position: relative;
  padding-left: 18px;
  font-size: 14px;
  color: var(--color-muted);
  line-height: 1.75;
}

.usage-list li + li {
  margin-top: 10px;
}

.usage-list li::before {
  content: "";
  position: absolute;
  top: 11px;
  left: 2px;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background-color: var(--color-accent);
}

.usage-links {
  margin-top: 16px;
  font-size: 14px;
}

.usage-links a {
  display: inline-block;
  min-height: 24px;
  color: var(--color-primary);
  font-weight: 500;
  border-bottom: 1px solid var(--color-line-strong);
}

.usage-links a:hover {
  color: var(--color-accent-dark);
  border-bottom-color: var(--color-accent);
}

.usage-links a + a {
  margin-left: 14px;
}

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

.page-media {
  margin: 0 0 40px;
}

.page-media img {
  width: 100%;
  height: 280px;
  object-fit: cover;
  border-radius: var(--radius-lg);
  background-color: #eef2f7;
}

.media-caption {
  margin-top: 10px;
  color: var(--color-muted);
  font-size: 13px;
}

.section-fields-table .section-lead {
  margin-bottom: 20px;
}

.section-boundary {
  padding-top: 44px;
}

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

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

.boundary-values {
  border-left: 3px solid var(--color-primary);
}

.boundary-limit {
  border-left: 3px solid var(--color-accent);
}

.subsection-text {
  margin-top: 10px;
  font-size: 14px;
  color: var(--color-muted);
  line-height: 1.75;
}

.value-list,
.limit-list {
  margin-top: 14px;
}

.value-item,
.limit-item {
  position: relative;
  padding-left: 18px;
  font-size: 14px;
  color: var(--color-text);
  line-height: 1.75;
}

.value-item + .value-item,
.limit-item + .limit-item {
  margin-top: 10px;
}

.value-item::before,
.limit-item::before {
  content: "";
  position: absolute;
  top: 11px;
  left: 2px;
  width: 6px;
  height: 6px;
  border-radius: 50%;
}

.value-item::before {
  background-color: var(--color-primary);
}

.limit-item::before {
  background-color: var(--color-accent);
}

.section-faq .section-lead {
  margin-bottom: 20px;
}

.faq-list {
  display: grid;
  gap: 12px;
}

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

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

.faq-question {
  position: relative;
  display: block;
  padding: 16px 48px 16px 20px;
  color: var(--color-primary);
  font-size: 16px;
  font-weight: 600;
  cursor: pointer;
  list-style: none;
}

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

.faq-question::after {
  content: "+";
  position: absolute;
  top: 50%;
  right: 20px;
  transform: translateY(-50%);
  color: var(--color-accent);
  font-size: 20px;
  font-weight: 600;
  line-height: 1;
}

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

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

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

.faq-answer p {
  font-size: 14px;
  color: var(--color-text);
  line-height: 1.75;
}

.section-related .section-lead {
  margin-bottom: 20px;
}

.related-list {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 20px;
}

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

.related-link {
  display: inline-block;
  min-height: 24px;
  color: var(--color-primary);
  font-size: 16px;
  font-weight: 600;
}

.related-link:hover {
  color: var(--color-accent-dark);
  text-decoration: underline;
}

.related-text {
  margin-top: 10px;
  font-size: 14px;
  color: var(--color-muted);
  line-height: 1.7;
}

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

.guide-steps {
  margin-bottom: 48px;
}

.section-intro {
  margin-top: 10px;
  margin-bottom: 20px;
  max-width: 820px;
  font-size: 15px;
  color: var(--color-muted);
}

.step-list {
  display: grid;
  gap: 16px;
}

.step-item {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  min-width: 0;
  padding: 22px;
  background-color: var(--color-card);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-lg);
}

.step-index {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex: 0 0 auto;
  width: 34px;
  height: 34px;
  border-radius: var(--radius-sm);
  background-color: var(--color-accent);
  color: #ffffff;
  font-size: 15px;
  font-weight: 600;
}

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

.step-name {
  font-size: 17px;
  font-weight: 600;
  color: var(--color-primary);
}

.step-desc {
  margin-top: 8px;
  font-size: 14px;
  color: var(--color-text);
  line-height: 1.75;
}

.step-link {
  display: inline-block;
  min-height: 24px;
  margin-top: 10px;
  color: var(--color-primary);
  font-size: 14px;
  font-weight: 600;
  border-bottom: 1px solid var(--color-line-strong);
}

.step-link:hover {
  color: var(--color-accent-dark);
  border-bottom-color: var(--color-accent);
}

.guide-entry {
  margin-bottom: 48px;
}

.entry-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1.2fr);
  gap: 32px;
  align-items: start;
}

.entry-figure {
  margin: 0;
  min-width: 0;
}

.entry-figure img {
  width: 100%;
  height: 300px;
  object-fit: cover;
  border-radius: var(--radius-lg);
  background-color: #eef2f7;
}

.entry-caption {
  margin-top: 10px;
  color: var(--color-muted);
  font-size: 13px;
  line-height: 1.6;
}

.entry-list {
  min-width: 0;
}

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

.entry-item + .entry-item {
  margin-top: 14px;
}

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

.entry-text {
  margin-top: 8px;
  font-size: 14px;
  color: var(--color-text);
  line-height: 1.75;
}

.guide-boundary {
  margin-bottom: 48px;
}

.boundary-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20px;
}

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

.boundary-name {
  font-size: 17px;
  font-weight: 600;
  color: var(--color-primary);
}

.boundary-text {
  margin-top: 10px;
  font-size: 14px;
  color: var(--color-text);
  line-height: 1.75;
}

.guide-index .index-grid {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

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

.index-link {
  display: inline-block;
  min-height: 24px;
  color: var(--color-primary);
  font-size: 16px;
  font-weight: 600;
}

.index-link:hover {
  color: var(--color-accent-dark);
  text-decoration: underline;
}

.index-desc {
  margin-top: 10px;
  font-size: 14px;
  color: var(--color-muted);
  line-height: 1.7;
}

/* ==========================================================================
   pages —— 404
   ========================================================================== */

.error-main {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  max-width: var(--container);
  min-height: 62vh;
  margin: 0 auto;
  padding: 64px 24px 80px;
}

.error-block {
  width: 100%;
  max-width: 680px;
  text-align: center;
}

.error-code {
  color: var(--color-accent);
  font-size: 64px;
  font-weight: 700;
  line-height: 1;
}

.error-title {
  margin-top: 16px;
  font-size: 26px;
  font-weight: 600;
  color: var(--color-primary);
}

.error-text {
  margin-top: 14px;
  font-size: 15px;
  color: var(--color-muted);
}

.error-text + .error-text {
  margin-top: 8px;
}

.error-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 12px;
  margin-top: 26px;
}

.error-links {
  margin-top: 34px;
  padding-top: 24px;
  border-top: 1px solid var(--color-line);
}

.error-list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 10px 20px;
}

.error-list a {
  display: inline-block;
  min-height: 28px;
  color: var(--color-primary);
  font-size: 14px;
  font-weight: 500;
  border-bottom: 1px solid var(--color-line-strong);
}

.error-list a:hover {
  color: var(--color-accent-dark);
  border-bottom-color: var(--color-accent);
}

/* ==========================================================================
   responsive —— 平板与手机适配
   ========================================================================== */

@media (max-width: 1024px) {
  .hero-inner {
    gap: 32px;
  }

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

  .hero-media img {
    height: 300px;
  }

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

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

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

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

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

@media (max-width: 768px) {
  .header-inner {
    flex-wrap: wrap;
    padding: 0 16px;
  }

  .nav-toggle {
    display: flex;
  }

  .site-nav {
    flex-basis: 100%;
    width: 100%;
  }

  .nav-list {
    display: none;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    width: 100%;
    padding: 6px 0 12px;
    border-top: 1px solid var(--color-line);
  }

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

  .nav-list > li {
    width: 100%;
  }

  .nav-link {
    justify-content: flex-start;
    width: 100%;
    min-height: 48px;
    padding: 10px 12px;
    border-radius: var(--radius-sm);
    font-size: 16px;
  }

  .nav-link.is-current {
    background-color: #eef2f7;
    box-shadow: inset 3px 0 0 var(--color-accent);
  }

  .inner-main {
    padding: 18px 16px 48px;
  }

  .page-header {
    margin-bottom: 26px;
    padding-bottom: 18px;
  }

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

  .page-description {
    font-size: 14px;
  }

  .section {
    padding: 36px 0;
  }

  .section-title {
    font-size: 19px;
  }

  .subsection-title {
    font-size: 16px;
  }

  .hero-inner {
    grid-template-columns: minmax(0, 1fr);
    gap: 24px;
    padding: 32px 16px 40px;
  }

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

  .hero-lead {
    font-size: 15px;
  }

  .hero-actions {
    gap: 10px;
  }

  .btn {
    flex: 1 1 auto;
    padding: 10px 18px;
  }

  .hero-media img {
    height: 210px;
  }

  .section-media img {
    height: 180px;
  }

  .collection-grid,
  .collection-cards,
  .path-steps,
  .index-grid,
  .channel-articles,
  .advice-columns,
  .usage-columns,
  .boundary-layout,
  .boundary-grid,
  .related-list,
  .guide-index .index-grid {
    grid-template-columns: minmax(0, 1fr);
  }

  .channel-article:last-child:nth-child(odd) {
    grid-column: auto;
  }

  .channel-figure img,
  .page-media img {
    height: 200px;
  }

  .entry-figure img {
    height: 210px;
  }

  .collection-media img {
    height: 190px;
  }

  .footer-inner {
    padding: 34px 16px 24px;
  }

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

  .error-main {
    padding: 48px 16px 64px;
  }

  .error-code {
    font-size: 52px;
  }

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

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

  .channel-table {
    min-width: 680px;
  }
}

@media (max-width: 480px) {
  .brand-sub {
    font-size: 15px;
    white-space: normal;
  }

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

  .hero-media img {
    height: 180px;
  }
}