:root {
  --color-primary: #1F6F6B;
  --color-primary-dark: #185955;
  --color-accent: #F08A3C;
  --color-bg: #F7F8F9;
  --color-card: #FFFFFF;
  --color-text: #23282D;
  --color-muted: #6B7280;
  --color-line: #E3E6E8;
  --color-soft: #EEF3F2;
  --color-accent-soft: #FDF1E6;
  --radius-sm: 4px;
  --radius-md: 6px;
  --radius-lg: 8px;
  --shadow-card: 0 1px 2px rgba(35, 40, 45, 0.06), 0 6px 18px rgba(35, 40, 45, 0.05);
  --shadow-hover: 0 2px 6px rgba(35, 40, 45, 0.09), 0 12px 26px rgba(35, 40, 45, 0.08);
  --font-sans: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", "Source Han Sans SC", sans-serif;
  --main-width: 1080px;
  --aside-width: 232px;
  --gap-layout: 28px;
}

* {
  box-sizing: border-box;
}

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

body {
  margin: 0;
  background-color: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.75;
  letter-spacing: 0;
}

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

a {
  color: var(--color-primary);
  text-decoration: none;
}

a:hover,
a:focus-visible {
  color: var(--color-primary-dark);
  text-decoration: underline;
}

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

p {
  margin: 0;
}

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

figure {
  margin: 0;
}

button {
  font-family: inherit;
}

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

/* ============ 布局骨架 ============ */

.site-body {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 40;
  background-color: #FFFFFF;
  border-bottom: 1px solid var(--color-line);
}

.header-inner {
  display: flex;
  align-items: center;
  gap: 18px;
  width: 100%;
  max-width: var(--main-width);
  margin: 0 auto;
  padding: 10px 24px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  flex: 0 0 auto;
  color: var(--color-text);
  text-decoration: none;
}

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

.brand-mark {
  display: block;
  width: 34px;
  height: 34px;
  border-radius: var(--radius-md);
  background-color: var(--color-primary);
  background-image: linear-gradient(135deg, #1F6F6B 0%, #2E8C86 100%);
  position: relative;
}

.brand-mark::after {
  content: "";
  position: absolute;
  top: 50%;
  left: 50%;
  width: 0;
  height: 0;
  transform: translate(-42%, -50%);
  border-left: 11px solid #FFFFFF;
  border-top: 7px solid transparent;
  border-bottom: 7px solid transparent;
}

.brand-text {
  display: flex;
  flex-direction: column;
  line-height: 1.25;
}

.brand-name {
  font-size: 17px;
  font-weight: 700;
  color: var(--color-text);
}

.brand-slogan {
  font-size: 12px;
  color: var(--color-muted);
}

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

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

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

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

.nav-link {
  display: block;
  padding: 9px 14px;
  border-radius: var(--radius-md);
  color: var(--color-text);
  font-size: 15px;
  line-height: 1.4;
}

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

.nav-link.is-current {
  background-color: var(--color-primary);
  color: #FFFFFF;
  font-weight: 600;
}

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

.page-layout {
  width: 100%;
  max-width: var(--main-width);
  margin: 0 auto;
  padding: 24px 24px 48px;
  display: grid;
  grid-template-columns: var(--aside-width) minmax(0, 1fr);
  gap: var(--gap-layout);
  align-items: start;
}

.layout-shell {
  width: 100%;
  max-width: var(--main-width);
  margin: 0 auto;
  padding: 24px 24px 48px;
  display: grid;
  grid-template-columns: var(--aside-width) minmax(0, 1fr);
  gap: var(--gap-layout);
  align-items: start;
}

/* 当 .sidebar-left 位于 body 或祖先节点时，页面布局容器仍保持侧栏在左 */
.sidebar-left .page-layout,
.sidebar-left .layout-shell,
body.sidebar-left .page-layout,
body.sidebar-left .layout-shell {
  grid-template-columns: var(--aside-width) minmax(0, 1fr);
}

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

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

.inner-main {
  max-width: var(--main-width);
}

/* ============ 侧栏 ============ */

.site-aside,
.side-nav,
.sidebar {
  background-color: var(--color-card);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-lg);
  padding: 18px 16px;
  position: sticky;
  top: 78px;
}

.aside-title,
.side-nav-title,
.sidebar-title {
  font-size: 15px;
  font-weight: 700;
  color: var(--color-text);
  padding-bottom: 10px;
  margin-bottom: 10px;
  border-bottom: 1px solid var(--color-line);
}

.aside-title + .aside-list,
.side-nav-title + .side-nav-list,
.sidebar-title + .sidebar-list {
  margin-bottom: 16px;
}

.aside-list,
.side-nav-list,
.sidebar-list {
  display: flex;
  flex-direction: column;
  gap: 2px;
  margin-bottom: 16px;
}

.aside-list li,
.side-nav-list li,
.sidebar-list li {
  min-width: 0;
}

.aside-link,
.side-nav-link,
.sidebar-link {
  display: block;
  min-height: 44px;
  padding: 10px 12px;
  border-radius: var(--radius-md);
  color: var(--color-text);
  font-size: 15px;
  line-height: 1.5;
}

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

.aside-link.is-current,
.side-nav-link.is-current,
.sidebar-link.is-current {
  background-color: var(--color-soft);
  color: var(--color-primary);
  font-weight: 600;
  border-left: 3px solid var(--color-primary);
  padding-left: 9px;
}

.aside-note,
.sidebar-note {
  padding: 12px 12px 14px;
  border-radius: var(--radius-md);
  background-color: var(--color-soft);
}

.aside-note-title,
.sidebar-note-title {
  font-size: 14px;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 6px;
}

.aside-note p,
.sidebar-note p,
.side-nav-note {
  font-size: 13px;
  line-height: 1.7;
  color: var(--color-muted);
}

.side-nav-note {
  margin: 0;
  padding: 12px;
  border-radius: var(--radius-md);
  background-color: var(--color-soft);
}

/* ============ 通用区块与标题 ============ */

.section {
  margin-bottom: 36px;
}

.section:last-child {
  margin-bottom: 0;
}

.section-head {
  margin-bottom: 18px;
}

.section-title {
  font-size: 22px;
  margin-bottom: 8px;
  padding-left: 12px;
  border-left: 4px solid var(--color-primary);
  line-height: 1.4;
}

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

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

.section-note {
  margin-top: 16px;
  font-size: 14px;
  color: var(--color-muted);
}

.text-link {
  color: var(--color-primary);
  font-size: 15px;
  font-weight: 600;
  border-bottom: 1px solid rgba(31, 111, 107, 0.35);
  padding-bottom: 1px;
}

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

/* ============ 按钮 ============ */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 10px 22px;
  border-radius: var(--radius-md);
  font-size: 15px;
  font-weight: 600;
  line-height: 1.4;
  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: var(--color-primary-dark);
  border-color: var(--color-primary-dark);
  color: #FFFFFF;
  text-decoration: none;
}

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

.btn-ghost:hover,
.btn-ghost:focus-visible {
  background-color: var(--color-soft);
  color: var(--color-primary-dark);
  text-decoration: none;
}

/* ============ 首页 hero ============ */

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(0, 1fr);
  gap: 0;
  background-color: var(--color-card);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-lg);
  overflow: hidden;
  margin-bottom: 36px;
  box-shadow: var(--shadow-card);
}

.hero-figure {
  position: relative;
  min-height: 320px;
  background-color: var(--color-soft);
}

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

.hero-body {
  padding: 28px 26px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 12px;
}

.hero-eyebrow {
  display: inline-block;
  align-self: flex-start;
  padding: 3px 10px;
  border-radius: var(--radius-sm);
  background-color: var(--color-accent-soft);
  color: #B45F1C;
  font-size: 13px;
  font-weight: 600;
  line-height: 1.6;
}

.hero-title {
  font-size: 32px;
  line-height: 1.3;
}

.hero-lead {
  font-size: 15px;
  line-height: 1.85;
  color: var(--color-muted);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 4px;
}

.hero-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 6px;
}

.tag {
  display: inline-block;
  padding: 3px 10px;
  border-radius: var(--radius-sm);
  background-color: var(--color-soft);
  color: var(--color-primary);
  font-size: 13px;
  line-height: 1.7;
}

/* ============ 频道卡片 ============ */

.channel-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
}

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

.channel-card:hover {
  border-color: #C9D6D4;
  box-shadow: var(--shadow-hover);
  transform: translateY(-2px);
}

.channel-media,
.channel-figure {
  background-color: var(--color-soft);
}

.channel-media img,
.channel-figure img {
  display: block;
  width: 100%;
  height: 148px;
  object-fit: cover;
}

.channel-body {
  padding: 14px 16px 16px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.channel-name {
  font-size: 18px;
  line-height: 1.4;
}

.channel-card .channel-name {
  padding: 14px 16px 0;
}

.channel-card .channel-scope {
  padding: 6px 16px 0;
}

.channel-card .channel-order {
  padding: 6px 16px 16px;
}

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

.channel-audience {
  font-size: 14px;
  line-height: 1.75;
  color: var(--color-muted);
}

.channel-order {
  font-size: 13px;
  line-height: 1.7;
  color: var(--color-muted);
  padding-top: 6px;
  border-top: 1px dashed var(--color-line);
}

.channel-body .channel-order {
  margin-top: 4px;
}

/* ============ 专题列表 ============ */

.topic-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
}

.topic-card {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 18px;
  background-color: var(--color-card);
  border: 1px solid var(--color-line);
  border-left: 4px solid var(--color-accent);
  border-radius: var(--radius-lg);
  transition: box-shadow 0.18s ease, border-color 0.18s ease;
}

.topic-card:hover {
  box-shadow: var(--shadow-hover);
}

.topic-badge {
  align-self: flex-start;
  padding: 2px 9px;
  border-radius: var(--radius-sm);
  background-color: var(--color-accent-soft);
  color: #B45F1C;
  font-size: 12px;
  font-weight: 600;
  line-height: 1.7;
}

.topic-name {
  font-size: 18px;
  line-height: 1.4;
}

.topic-scope {
  font-size: 14px;
  line-height: 1.8;
  color: var(--color-text);
}

.topic-order {
  font-size: 13px;
  line-height: 1.7;
  color: var(--color-muted);
}

.topic-link {
  align-self: flex-start;
  margin-top: 2px;
  font-size: 14px;
  font-weight: 600;
  color: var(--color-primary);
  border-bottom: 1px solid rgba(31, 111, 107, 0.35);
  padding-bottom: 1px;
}

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

/* ============ 首页步骤列表 ============ */

.steps-section .step-list {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 14px;
  counter-reset: home-step;
}

.steps-section .step-item {
  position: relative;
  padding: 18px 16px 16px;
  background-color: var(--color-card);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-lg);
}

.steps-section .step-index {
  display: inline-block;
  margin-bottom: 8px;
  padding: 2px 9px;
  border-radius: var(--radius-sm);
  background-color: var(--color-primary);
  color: #FFFFFF;
  font-size: 12px;
  font-weight: 700;
  line-height: 1.7;
}

.steps-section .step-name {
  font-size: 16px;
  margin-bottom: 6px;
}

.steps-section .step-text {
  font-size: 14px;
  line-height: 1.8;
  color: var(--color-muted);
}

.steps-more,
.updates-more {
  margin-top: 16px;
  font-size: 15px;
}

/* ============ 首页时间线 ============ */

.updates-section .timeline {
  display: flex;
  flex-direction: column;
  gap: 0;
  border-left: 2px solid var(--color-line);
  padding-left: 0;
}

.updates-section .timeline-item {
  position: relative;
  display: grid;
  grid-template-columns: 96px 84px minmax(0, 1fr);
  align-items: start;
  gap: 12px;
  padding: 12px 0 12px 20px;
  border-bottom: 1px dashed var(--color-line);
}

.updates-section .timeline-item:last-child {
  border-bottom: 0;
}

.updates-section .timeline-item::before {
  content: "";
  position: absolute;
  left: -7px;
  top: 20px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background-color: #FFFFFF;
  border: 3px solid var(--color-primary);
}

.updates-section .timeline-date {
  font-size: 13px;
  color: var(--color-muted);
  line-height: 1.8;
}

.updates-section .timeline-type {
  display: inline-block;
  align-self: start;
  padding: 1px 8px;
  border-radius: var(--radius-sm);
  background-color: var(--color-soft);
  color: var(--color-primary);
  font-size: 12px;
  font-weight: 600;
  line-height: 1.8;
  text-align: center;
}

.updates-section .timeline-text {
  font-size: 14px;
  line-height: 1.8;
  color: var(--color-text);
}

/* ============ 内页面包屑与标题区 ============ */

.breadcrumb {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 6px;
  font-size: 13px;
  color: var(--color-muted);
  margin-bottom: 14px;
}

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

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

.breadcrumb-sep {
  color: #B7BEC6;
}

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

.page-header {
  padding: 22px 24px;
  margin-bottom: 28px;
  background-color: var(--color-card);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-lg);
}

.page-title {
  font-size: 32px;
  line-height: 1.3;
  margin-bottom: 10px;
}

.page-description {
  font-size: 15px;
  line-height: 1.85;
  color: var(--color-muted);
  max-width: 760px;
}

.page-figure,
.page-media {
  margin-top: 18px;
  border-radius: var(--radius-md);
  overflow: hidden;
  background-color: var(--color-soft);
}

.page-figure img,
.page-media img {
  display: block;
  width: 100%;
  height: 260px;
  object-fit: cover;
}

.page-figure figcaption,
.page-media figcaption {
  padding: 10px 14px;
  font-size: 13px;
  color: var(--color-muted);
  background-color: var(--color-card);
  border-top: 1px solid var(--color-line);
}

/* ============ 频道分类页 ============ */

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

.channel-groups .channel-card {
  flex-direction: row;
  align-items: stretch;
}

.channel-groups .channel-figure {
  flex: 0 0 168px;
  max-width: 168px;
}

.channel-groups .channel-figure img {
  height: 100%;
  min-height: 176px;
}

/* ============ 数据表格 ============ */

.table-wrap {
  overflow-x: auto;
  background-color: var(--color-card);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-lg);
}

.data-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
  min-width: 560px;
}

.table-caption {
  caption-side: top;
  text-align: left;
  padding: 14px 18px 10px;
  font-size: 14px;
  font-weight: 600;
  color: var(--color-muted);
}

.data-table thead th {
  background-color: var(--color-soft);
  color: var(--color-text);
  font-size: 14px;
  text-align: left;
  padding: 11px 16px;
  border-bottom: 1px solid var(--color-line);
  white-space: nowrap;
}

.data-table tbody th {
  text-align: left;
  font-weight: 600;
  color: var(--color-text);
  padding: 12px 16px;
  border-bottom: 1px solid var(--color-line);
  background-color: #FBFCFC;
  white-space: nowrap;
  vertical-align: top;
}

.data-table tbody td {
  padding: 12px 16px;
  border-bottom: 1px solid var(--color-line);
  color: var(--color-muted);
  line-height: 1.75;
  vertical-align: top;
}

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

.data-table tbody tr:hover th,
.data-table tbody tr:hover td {
  background-color: #F9FBFA;
}

.label {
  display: inline-block;
  padding: 1px 8px;
  border-radius: var(--radius-sm);
  background-color: var(--color-soft);
  color: var(--color-primary);
  font-size: 12px;
  font-weight: 600;
  line-height: 1.8;
}

/* ============ 有序列表（频道浏览顺序 / 专题顺序） ============ */

.order-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
  counter-reset: order;
}

.order-item {
  position: relative;
  padding: 16px 18px 16px 52px;
  background-color: var(--color-card);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-lg);
  counter-increment: order;
}

.order-item::before {
  content: counter(order);
  position: absolute;
  left: 16px;
  top: 16px;
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background-color: var(--color-primary);
  color: #FFFFFF;
  font-size: 13px;
  font-weight: 700;
  line-height: 24px;
  text-align: center;
}

.order-name,
.order-item-title {
  font-size: 16px;
  margin-bottom: 6px;
}

.order-text,
.order-item p {
  font-size: 14px;
  line-height: 1.8;
  color: var(--color-muted);
}

/* ============ 专题页 ============ */

.topic-figure {
  margin-bottom: 20px;
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--color-line);
  background-color: var(--color-soft);
}

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

.topic-figure figcaption {
  padding: 10px 16px;
  font-size: 13px;
  color: var(--color-muted);
  background-color: var(--color-card);
  border-top: 1px solid var(--color-line);
}

.topic-card-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
}

.topic-card-list .topic-card {
  border-left: 4px solid var(--color-primary);
}

.topic-card-title {
  font-size: 18px;
  line-height: 1.4;
}

.topic-card-scope {
  font-size: 14px;
  line-height: 1.8;
  color: var(--color-text);
}

.topic-card-count {
  font-size: 13px;
  line-height: 1.7;
  color: var(--color-muted);
  padding-top: 6px;
  border-top: 1px dashed var(--color-line);
}

.topic-card-link {
  align-self: flex-start;
  font-size: 14px;
  font-weight: 600;
  color: var(--color-primary);
  border-bottom: 1px solid rgba(31, 111, 107, 0.35);
  padding-bottom: 1px;
}

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

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

.update-item {
  padding: 14px 16px;
  background-color: var(--color-card);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-lg);
}

.update-tag {
  display: inline-block;
  margin-bottom: 6px;
  padding: 1px 9px;
  border-radius: var(--radius-sm);
  background-color: var(--color-accent-soft);
  color: #B45F1C;
  font-size: 12px;
  font-weight: 600;
  line-height: 1.8;
}

.update-title {
  font-size: 16px;
  margin-bottom: 4px;
}

.update-item p {
  font-size: 14px;
  line-height: 1.8;
  color: var(--color-muted);
}

/* ============ 观看指南页 ============ */

.guide-steps {
  margin-bottom: 36px;
}

.guide-steps .step-list {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.guide-steps .step-item {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  padding: 18px 20px;
  background-color: var(--color-card);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-lg);
}

.guide-steps .step-no {
  flex: 0 0 auto;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 34px;
  height: 34px;
  border-radius: 50%;
  background-color: var(--color-primary);
  color: #FFFFFF;
  font-size: 15px;
  font-weight: 700;
  line-height: 1;
}

.guide-steps .step-body {
  min-width: 0;
  flex: 1 1 auto;
}

.guide-steps .step-title {
  font-size: 17px;
  margin-bottom: 6px;
}

.guide-steps .step-body p {
  font-size: 14px;
  line-height: 1.85;
  color: var(--color-text);
}

.guide-steps .step-result {
  margin-top: 8px;
  padding: 8px 12px;
  border-radius: var(--radius-md);
  background-color: var(--color-soft);
  color: var(--color-primary);
  font-size: 13px;
  line-height: 1.75;
}

.checkpoints {
  margin-bottom: 36px;
}

.checkpoint-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}

.checkpoint-card {
  padding: 16px 18px;
  background-color: var(--color-card);
  border: 1px solid var(--color-line);
  border-top: 3px solid var(--color-accent);
  border-radius: var(--radius-lg);
}

.checkpoint-title {
  font-size: 16px;
  margin-bottom: 6px;
}

.checkpoint-card p {
  font-size: 14px;
  line-height: 1.8;
  color: var(--color-text);
}

.checkpoint-judge {
  margin-top: 8px;
  color: var(--color-muted);
}

.checkpoint-judge strong {
  color: var(--color-primary);
}

.faq {
  margin-bottom: 36px;
}

.faq-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

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

.faq-question {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  min-height: 48px;
  padding: 13px 18px;
  font-size: 15px;
  font-weight: 600;
  color: var(--color-text);
  cursor: pointer;
  list-style: none;
}

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

.faq-question::after {
  content: "+";
  flex: 0 0 auto;
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background-color: var(--color-soft);
  color: var(--color-primary);
  font-size: 15px;
  font-weight: 700;
  line-height: 22px;
  text-align: center;
}

.faq-item[open] .faq-question::after {
  content: "−";
  background-color: var(--color-accent-soft);
  color: #B45F1C;
}

.faq-question:hover {
  background-color: #FAFBFB;
}

.faq-answer {
  padding: 0 18px 16px;
}

.faq-answer p {
  font-size: 14px;
  line-height: 1.85;
  color: var(--color-muted);
}

/* ============ 变动记录页 ============ */

.record-fields {
  margin-bottom: 36px;
}

.record-fields h2,
.timeline h2,
.limits h2,
.related-links h2 {
  font-size: 22px;
  margin-bottom: 10px;
  padding-left: 12px;
  border-left: 4px solid var(--color-primary);
  line-height: 1.4;
}

.record-fields > p,
.timeline > p,
.limits > p {
  font-size: 15px;
  line-height: 1.85;
  color: var(--color-muted);
  margin-bottom: 16px;
}

.field-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
  min-width: 560px;
}

.record-fields .field-table {
  min-width: 0;
}

.record-fields {
  overflow-x: auto;
}

.field-table caption {
  caption-side: top;
  text-align: left;
  padding-bottom: 10px;
  font-size: 14px;
  font-weight: 600;
  color: var(--color-muted);
}

.field-table thead th {
  background-color: var(--color-soft);
  color: var(--color-text);
  text-align: left;
  padding: 11px 16px;
  border-bottom: 1px solid var(--color-line);
  white-space: nowrap;
}

.field-table tbody th {
  text-align: left;
  font-weight: 600;
  color: var(--color-text);
  padding: 12px 16px;
  border-bottom: 1px solid var(--color-line);
  background-color: #FBFCFC;
  white-space: nowrap;
  vertical-align: top;
}

.field-table tbody td {
  padding: 12px 16px;
  border-bottom: 1px solid var(--color-line);
  color: var(--color-muted);
  line-height: 1.75;
  vertical-align: top;
}

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

.field-table tbody tr:hover th,
.field-table tbody tr:hover td {
  background-color: #F9FBFA;
}

.field-note {
  margin-top: 12px;
  font-size: 13px;
  line-height: 1.8;
  color: var(--color-muted);
}

.timeline {
  margin-bottom: 36px;
}

.timeline-list {
  position: relative;
  border-left: 2px solid var(--color-line);
  padding-left: 22px;
}

.timeline-list .timeline-item {
  position: relative;
  padding: 0 0 20px;
}

.timeline-list .timeline-item:last-child {
  padding-bottom: 0;
}

.timeline-list .timeline-item::before {
  content: "";
  position: absolute;
  left: -29px;
  top: 7px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background-color: #FFFFFF;
  border: 3px solid var(--color-primary);
}

.timeline-list .timeline-date {
  display: inline-block;
  margin-right: 10px;
  font-size: 13px;
  color: var(--color-muted);
  line-height: 1.8;
}

.timeline-list .timeline-type {
  display: inline-block;
  padding: 1px 9px;
  border-radius: var(--radius-sm);
  background-color: var(--color-soft);
  color: var(--color-primary);
  font-size: 12px;
  font-weight: 600;
  line-height: 1.8;
}

.timeline-list .timeline-title {
  font-size: 16px;
  margin: 6px 0 4px;
}

.timeline-list .timeline-summary {
  font-size: 14px;
  line-height: 1.8;
  color: var(--color-muted);
}

.limits {
  margin-bottom: 36px;
}

.limits-list {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
  margin-bottom: 16px;
}

.limit-item {
  padding: 16px 18px;
  background-color: var(--color-card);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-lg);
}

.limit-item h3 {
  font-size: 16px;
  margin-bottom: 6px;
}

.limit-item p {
  font-size: 14px;
  line-height: 1.8;
  color: var(--color-muted);
}

.limits-feedback {
  font-size: 14px;
  line-height: 1.9;
  color: var(--color-muted);
}

.limits-feedback a {
  color: var(--color-primary);
  font-weight: 600;
}

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

/* ============ 延伸阅读 ============ */

.related-links {
  margin-bottom: 8px;
}

.related-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
}

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

.related-list a {
  display: block;
  min-height: 44px;
  padding: 11px 16px;
  background-color: var(--color-card);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  color: var(--color-text);
  font-size: 14px;
  line-height: 1.6;
}

.related-list a:hover,
.related-list a:focus-visible {
  border-color: var(--color-primary);
  background-color: var(--color-soft);
  color: var(--color-primary);
  text-decoration: none;
}

/* ============ 404 ============ */

.error-main {
  width: 100%;
  max-width: 720px;
  margin: 0 auto;
  padding: 56px 24px 64px;
}

.error-panel {
  padding: 32px 28px;
  background-color: var(--color-card);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-lg);
  text-align: left;
  margin-bottom: 28px;
}

.error-code {
  font-size: 44px;
  font-weight: 700;
  color: var(--color-primary);
  line-height: 1.1;
  margin-bottom: 8px;
}

.error-panel h1 {
  font-size: 26px;
  margin-bottom: 12px;
}

.error-text {
  font-size: 15px;
  line-height: 1.85;
  color: var(--color-muted);
  margin-bottom: 8px;
}

.error-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 18px;
}

.error-links h2 {
  font-size: 20px;
  margin-bottom: 12px;
  padding-left: 12px;
  border-left: 4px solid var(--color-primary);
  line-height: 1.4;
}

.error-link-list {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 10px;
}

.error-link-list a {
  display: block;
  min-height: 44px;
  padding: 11px 14px;
  background-color: var(--color-card);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  color: var(--color-text);
  font-size: 14px;
  line-height: 1.6;
  text-align: center;
}

.error-link-list a:hover,
.error-link-list a:focus-visible {
  border-color: var(--color-primary);
  background-color: var(--color-soft);
  color: var(--color-primary);
  text-decoration: none;
}

/* ============ 页脚 ============ */

.site-footer {
  margin-top: auto;
  background-color: #FFFFFF;
  border-top: 1px solid var(--color-line);
}

.footer-inner {
  display: grid;
  grid-template-columns: minmax(0, 1.4fr) repeat(4, minmax(0, 1fr));
  gap: 24px;
  width: 100%;
  max-width: var(--main-width);
  margin: 0 auto;
  padding: 32px 24px 24px;
}

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

.footer-name {
  font-size: 17px;
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: 8px;
}

.footer-desc {
  font-size: 13px;
  line-height: 1.8;
  color: var(--color-muted);
}

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

.footer-title {
  font-size: 14px;
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: 10px;
}

.footer-list {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.footer-list a {
  display: block;
  min-height: 32px;
  padding: 5px 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--color-muted);
}

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

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

.footer-copy {
  width: 100%;
  max-width: var(--main-width);
  margin: 0 auto;
  padding: 14px 24px 18px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--color-muted);
}

/* ============ 滚动出现增强（不影响初始可见） ============ */

@media (prefers-reduced-motion: no-preference) {
  .reveal-ready .section,
  .reveal-ready .channel-card,
  .reveal-ready .topic-card,
  .reveal-ready .checkpoint-card,
  .reveal-ready .limit-item {
    transition: transform 0.32s ease, opacity 0.32s ease;
  }

  .reveal-ready .is-revealed {
    transform: none;
  }
}

/* ============ 响应式：1024 ============ */

@media (max-width: 1024px) {
  :root {
    --aside-width: 210px;
    --gap-layout: 22px;
  }

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

  .hero-figure,
  .hero-figure img {
    min-height: 240px;
  }

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

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

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

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

/* ============ 响应式：768 ============ */

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

  .nav-toggle {
    display: flex;
  }

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

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

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

  .nav-link {
    min-height: 44px;
    padding: 11px 12px;
  }

  .page-layout,
  .layout-shell,
  .page-layout.sidebar-left,
  .layout-shell.sidebar-left,
  .sidebar-left .page-layout,
  .sidebar-left .layout-shell,
  body.sidebar-left .page-layout,
  body.sidebar-left .layout-shell {
    grid-template-columns: minmax(0, 1fr);
    padding: 18px 16px 36px;
  }

  .site-aside,
  .side-nav,
  .sidebar {
    position: static;
    order: 2;
    padding: 14px 14px 12px;
  }

  .site-main {
    order: 1;
  }

  .hero {
    margin-bottom: 28px;
  }

  .hero-body {
    padding: 20px 18px 22px;
  }

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

  .page-header {
    padding: 18px 18px;
    margin-bottom: 22px;
  }

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

  .section {
    margin-bottom: 28px;
  }

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

  .channel-grid,
  .channel-groups .channel-grid,
  .topic-list,
  .topic-card-list,
  .order-list,
  .checkpoint-grid,
  .limits-list,
  .related-list,
  .error-link-list {
    grid-template-columns: minmax(0, 1fr);
  }

  .channel-groups .channel-card {
    flex-direction: column;
  }

  .channel-groups .channel-figure {
    flex: none;
    max-width: none;
  }

  .channel-groups .channel-figure img {
    height: 168px;
    min-height: 0;
  }

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

  .updates-section .timeline-item {
    grid-template-columns: minmax(0, 1fr);
    gap: 4px;
    padding-left: 18px;
  }

  .updates-section .timeline-type {
    justify-self: start;
  }

  .guide-steps .step-item {
    padding: 16px 16px;
    gap: 12px;
  }

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

  .topic-figure img {
    height: 190px;
  }

  .footer-inner {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 18px;
    padding: 26px 16px 18px;
  }

  .footer-copy {
    padding: 12px 16px 16px;
  }

  .error-main {
    padding: 36px 16px 48px;
  }
}

/* ============ 响应式：480 ============ */

@media (max-width: 480px) {
  body {
    font-size: 15px;
  }

  .header-inner {
    gap: 10px;
  }

  .brand-name {
    font-size: 16px;
  }

  .brand-slogan {
    font-size: 11px;
  }

  .hero-figure,
  .hero-figure img {
    min-height: 190px;
  }

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

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

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

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

  .channel-media img {
    height: 132px;
  }

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

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

  .record-fields {
    overflow-x: auto;
  }
}