/* ==========================================================================
   九九在线播放 · 全站样式表
   结构：base / layout / components / pages / responsive
   ========================================================================== */

/* --------------------------------------------------------------------------
   1. base —— 变量、重置、排版基线
   -------------------------------------------------------------------------- */

:root {
  --color-ink: #1f3a5f;
  --color-ink-soft: #2f4d73;
  --color-teal: #4a7c8c;
  --color-teal-soft: #e6eef0;
  --color-accent: #c96a2b;
  --color-accent-soft: #fbf0e7;
  --color-bg: #f5f6f8;
  --color-surface: #ffffff;
  --color-text: #2b2f36;
  --color-muted: #5c636e;
  --color-line: #dfe3e9;
  --color-line-strong: #c8cfd8;
  --radius-sm: 3px;
  --radius-md: 6px;
  --radius-lg: 8px;
  --shadow-card: 0 1px 2px rgba(31, 58, 95, 0.06);
  --shadow-raise: 0 4px 14px rgba(31, 58, 95, 0.12);
  --container: 1080px;
  --font-sans: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei",
    "Source Han Sans SC", "Noto Sans CJK SC", system-ui, -apple-system,
    "Segoe UI", Roboto, Arial, sans-serif;
}

*,
*::before,
*::after {
  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;
  font-variant-numeric: tabular-nums;
}

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

p {
  margin: 0;
}

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

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

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

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

figure {
  margin: 0;
}

figcaption {
  margin-top: 8px;
  color: var(--color-muted);
  font-size: 13px;
  line-height: 1.6;
}

button {
  font: inherit;
  color: inherit;
}

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

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

.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;
}

/* --------------------------------------------------------------------------
   2. layout —— 骨架：页头、导航、主容器、面包屑、页脚
   -------------------------------------------------------------------------- */

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

/* 顶部信息条（仅首页） */
.top-notice {
  background-color: var(--color-ink);
  color: #dfe7f1;
  font-size: 13px;
  line-height: 1.6;
}

.top-notice p {
  max-width: var(--container);
  margin: 0 auto;
  padding: 7px 20px;
}

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

.header-inner {
  display: flex;
  align-items: center;
  gap: 20px;
  max-width: var(--container);
  margin: 0 auto;
  padding: 12px 20px;
}

.brand {
  display: flex;
  flex-direction: column;
  gap: 2px;
  flex: 0 0 auto;
  color: var(--color-ink);
}

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

.brand-name {
  font-size: 19px;
  font-weight: 700;
  line-height: 1.2;
}

.brand-slogan {
  color: var(--color-muted);
  font-size: 12px;
  line-height: 1.4;
}

/* 主导航 */
.site-nav {
  margin-left: auto;
}

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

.nav-link {
  display: block;
  padding: 8px 12px;
  border-radius: var(--radius-sm);
  color: var(--color-ink-soft);
  font-size: 15px;
  line-height: 1.5;
  white-space: nowrap;
}

.nav-link:hover,
.nav-link:focus-visible {
  background-color: var(--color-teal-soft);
  color: var(--color-ink);
}

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

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

/* 汉堡按钮：桌面隐藏 */
.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  margin-left: auto;
  padding: 0 10px;
  background-color: transparent;
  border: 1px solid var(--color-line-strong);
  border-radius: var(--radius-sm);
  cursor: pointer;
}

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

/* 主内容 */
.site-main {
  flex: 1 1 auto;
  width: 100%;
}

.inner-main {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 20px 56px;
}

/* 面包屑 */
.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px;
  padding: 16px 0 0;
  color: var(--color-muted);
  font-size: 13px;
}

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

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

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

/* 内页标题区 */
.page-header {
  padding: 18px 0 22px;
  border-bottom: 1px solid var(--color-line);
  margin-bottom: 28px;
}

.page-title {
  font-size: 32px;
  font-weight: 700;
  color: var(--color-ink);
}

.page-description {
  margin-top: 10px;
  max-width: 76ch;
  color: var(--color-muted);
  font-size: 15px;
}

.page-description a {
  color: var(--color-teal);
  text-decoration: underline;
  text-underline-offset: 2px;
}

/* 页脚 */
.site-footer {
  background-color: var(--color-ink);
  color: #c9d4e2;
  font-size: 14px;
}

.footer-inner {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1fr;
  gap: 28px 24px;
  max-width: var(--container);
  margin: 0 auto;
  padding: 36px 20px 28px;
}

.footer-brand-name {
  color: #ffffff;
  font-size: 17px;
  font-weight: 700;
}

.footer-desc {
  margin-top: 8px;
  color: #a9b8cc;
  font-size: 13px;
  line-height: 1.7;
}

.footer-title {
  color: #ffffff;
  font-size: 14px;
  font-weight: 600;
  margin-bottom: 10px;
}

.footer-col ul {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.footer-col a {
  display: inline-block;
  padding: 3px 0;
  color: #c9d4e2;
  font-size: 13px;
}

.footer-col a:hover,
.footer-col a:focus-visible {
  color: #ffffff;
  text-decoration: underline;
  text-underline-offset: 3px;
}

.footer-meta p {
  color: #a9b8cc;
  font-size: 13px;
  line-height: 1.7;
}

.footer-copy {
  margin-top: 10px;
  color: #8b9cb4;
}

/* 通用区块 */
.section {
  padding: 40px 0;
  border-bottom: 1px solid var(--color-line);
}

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

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

.section-head h2,
.section-title {
  font-size: 22px;
  font-weight: 700;
  color: var(--color-ink);
}

.section-head p,
.section-desc,
.section-intro {
  margin-top: 8px;
  max-width: 78ch;
  color: var(--color-muted);
  font-size: 15px;
}

.section-desc a,
.section-intro a,
.section-note a,
.cross-note a,
.aside-note a {
  color: var(--color-teal);
  text-decoration: underline;
  text-underline-offset: 2px;
}

.section-more {
  margin-top: 20px;
}

.section-more a {
  display: inline-block;
  padding: 8px 14px;
  border: 1px solid var(--color-line-strong);
  border-radius: var(--radius-sm);
  color: var(--color-ink-soft);
  font-size: 14px;
}

.section-more a:hover,
.section-more a:focus-visible {
  border-color: var(--color-ink);
  background-color: var(--color-surface);
  color: var(--color-ink);
}

.section-note,
.cross-note {
  margin-top: 18px;
  color: var(--color-muted);
  font-size: 14px;
}

.section-note a,
.cross-note a {
  margin-right: 12px;
}

/* 图片容器通用约束 */
.section-media,
.guide-media,
.aside-figure,
.topic-media {
  overflow: hidden;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  background-color: var(--color-surface);
}

.section-media img,
.guide-media img,
.aside-figure img,
.topic-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* --------------------------------------------------------------------------
   3. components —— 按钮、标签、卡片、列表、表格、折叠
   -------------------------------------------------------------------------- */

/* 按钮 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 10px 20px;
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  font-size: 15px;
  font-weight: 600;
  line-height: 1.4;
  text-align: center;
  cursor: pointer;
}

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

.btn-primary:hover,
.btn-primary:focus-visible {
  background-color: var(--color-ink-soft);
  border-color: var(--color-ink-soft);
  color: #ffffff;
}

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

.btn-ghost:hover,
.btn-ghost:focus-visible {
  border-color: var(--color-ink);
  background-color: var(--color-surface);
  color: var(--color-ink);
}

/* 频道标签 */
.channel-tag {
  display: inline-flex;
}

.channel-tag a {
  display: inline-block;
  padding: 6px 12px;
  border: 1px solid var(--color-line-strong);
  border-radius: 999px;
  background-color: var(--color-surface);
  color: var(--color-teal);
  font-size: 13px;
  line-height: 1.5;
}

.channel-tag a:hover,
.channel-tag a:focus-visible {
  border-color: var(--color-teal);
  background-color: var(--color-teal-soft);
  color: var(--color-ink);
}

/* 频道行（首页索引 / 内页总表共用基础） */
.channel-row {
  border-bottom: 1px solid var(--color-line);
}

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

.channel-row-main {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 6px 12px;
}

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

.channel-direction {
  color: var(--color-muted);
  font-size: 14px;
}

/* 专题卡片（首页 / 专题页共用基础） */
.topic-card {
  display: flex;
  flex-direction: column;
  background-color: var(--color-surface);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: border-color 0.18s ease, box-shadow 0.18s ease,
    transform 0.18s ease;
}

.topic-card:hover {
  border-color: var(--color-line-strong);
  box-shadow: var(--shadow-raise);
  transform: translateY(-2px);
}

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

.topic-scope,
.topic-items,
.topic-count,
.topic-sample {
  color: var(--color-muted);
  font-size: 14px;
  line-height: 1.7;
}

.topic-label {
  display: inline-block;
  margin-right: 6px;
  padding: 1px 7px;
  border-radius: var(--radius-sm);
  background-color: var(--color-teal-soft);
  color: var(--color-teal);
  font-size: 12px;
  line-height: 1.6;
}

/* 更新条目 */
.update-type {
  display: inline-block;
  padding: 1px 8px;
  border-radius: var(--radius-sm);
  font-size: 12px;
  font-weight: 600;
  line-height: 1.7;
  white-space: nowrap;
}

.type-add,
.type-new {
  background-color: var(--color-accent-soft);
  color: var(--color-accent);
}

.type-adjust {
  background-color: var(--color-teal-soft);
  color: var(--color-teal);
}

.type-archive {
  background-color: #eceef1;
  color: var(--color-muted);
}

.update-target {
  color: var(--color-ink-soft);
  font-size: 13px;
  font-weight: 600;
}

.update-text,
.update-desc {
  color: var(--color-muted);
  font-size: 14px;
}

/* 列表要点 */
.guide-points li,
.boundary-list li {
  position: relative;
  padding-left: 16px;
  color: var(--color-muted);
  font-size: 14px;
  line-height: 1.75;
}

.guide-points li::before,
.boundary-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 11px;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background-color: var(--color-teal);
}

/* 表格（专题交叉引用） */
.cross-table-wrap {
  overflow-x: auto;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  background-color: var(--color-surface);
}

.cross-table {
  min-width: 560px;
  font-size: 14px;
}

.cross-table th,
.cross-table td {
  padding: 11px 14px;
  border-bottom: 1px solid var(--color-line);
  text-align: left;
  vertical-align: top;
}

.cross-table thead th {
  background-color: #f1f3f6;
  color: var(--color-ink);
  font-weight: 600;
  white-space: nowrap;
}

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

.cross-table tbody td {
  color: var(--color-muted);
}

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

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

.faq-item {
  background-color: var(--color-surface);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
}

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

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

.faq-question::after {
  content: "＋";
  float: right;
  margin-left: 12px;
  color: var(--color-teal);
  font-weight: 700;
}

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

.faq-item[open] .faq-question {
  border-bottom: 1px solid var(--color-line);
}

.faq-body {
  padding: 14px 16px 16px;
}

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

.faq-body p + p {
  margin-top: 8px;
}

.faq-cause {
  color: var(--color-text);
}

.faq-check {
  padding-left: 12px;
  border-left: 3px solid var(--color-teal-soft);
}

/* --------------------------------------------------------------------------
   4. pages —— 首页与各内页模块
   -------------------------------------------------------------------------- */

/* ---- 首页：首屏议程式焦点区 ---- */
.home-main {
  width: 100%;
}

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

.hero-inner {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(0, 1fr);
  gap: 32px;
  align-items: center;
  max-width: var(--container);
  margin: 0 auto;
  padding: 40px 20px 32px;
}

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

.hero-eyebrow {
  display: inline-block;
  padding: 3px 10px;
  border-radius: var(--radius-sm);
  background-color: var(--color-teal-soft);
  color: var(--color-teal);
  font-size: 13px;
  font-weight: 600;
}

.hero-title {
  margin-top: 14px;
  font-size: 32px;
  font-weight: 700;
  color: var(--color-ink);
}

.hero-desc {
  margin-top: 12px;
  max-width: 60ch;
  color: var(--color-text);
  font-size: 15px;
}

.hero-note {
  margin-top: 10px;
  max-width: 60ch;
  color: var(--color-muted);
  font-size: 14px;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 20px;
}

.hero-media {
  min-width: 0;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-lg);
  overflow: hidden;
  background-color: var(--color-bg);
}

.hero-media img {
  width: 100%;
  aspect-ratio: 16 / 10;
  height: auto;
  object-fit: cover;
}

.hero-media figcaption {
  padding: 0 12px 10px;
}

.hero-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 20px 28px;
}

/* ---- 首页：频道索引 ---- */
.channel-rows {
  background-color: var(--color-surface);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.channel-index .channel-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1.15fr);
  gap: 8px 24px;
  align-items: center;
  padding: 14px 18px;
}

.channel-index .channel-org {
  color: var(--color-muted);
  font-size: 14px;
}

/* ---- 首页：专题合集入口 ---- */
.topic-cards {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 20px;
}

.topic-entries .topic-card {
  padding-bottom: 16px;
}

.topic-entries .topic-media {
  border: 0;
  border-bottom: 1px solid var(--color-line);
  border-radius: 0;
}

.topic-entries .topic-media img {
  width: 100%;
  aspect-ratio: 16 / 9;
  height: auto;
  object-fit: cover;
}

.topic-entries .topic-name {
  margin: 14px 16px 0;
}

.topic-entries .topic-scope {
  margin: 6px 16px 0;
}

.topic-entries .topic-items {
  margin: 8px 16px 0;
}

/* ---- 首页：更新记录速览 ---- */
.update-groups {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20px;
}

.update-group {
  padding: 16px 18px;
  background-color: var(--color-surface);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
}

.update-month {
  font-size: 15px;
  font-weight: 700;
  color: var(--color-ink);
  padding-bottom: 10px;
  border-bottom: 1px solid var(--color-line);
}

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

.update-item {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 6px 10px;
}

.update-item .update-text {
  flex: 1 1 100%;
}

/* ---- 首页：观看指引摘要 ---- */
.guide-columns {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20px;
}

.guide-col {
  padding: 18px;
  background-color: var(--color-surface);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
}

.guide-col h3 {
  font-size: 16px;
  font-weight: 700;
  color: var(--color-ink);
  margin-bottom: 12px;
}

.guide-points {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

/* ---- 首页：站内页面索引 ---- */
.index-columns {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 18px;
}

.index-col {
  padding: 16px 18px;
  background-color: var(--color-surface);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
}

.index-col h3 {
  font-size: 16px;
  font-weight: 700;
}

.index-col h3 a {
  color: var(--color-ink);
}

.index-col h3 a:hover,
.index-col h3 a:focus-visible {
  color: var(--color-accent);
}

.index-col p {
  margin-top: 8px;
  color: var(--color-muted);
  font-size: 14px;
}

/* ---- 内页：频道分类 ---- */
.page-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
}

.channel-table-section .section-media {
  margin: 18px 0 22px;
}

.channel-table-section .section-media img {
  width: 100%;
  aspect-ratio: 21 / 9;
  height: auto;
  object-fit: cover;
}

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

.channel-table .channel-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(240px, 0.85fr);
  gap: 10px 24px;
  padding: 16px 18px;
}

.channel-meta {
  margin: 0;
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 4px 10px;
  align-content: start;
}

.channel-meta dt {
  color: var(--color-teal);
  font-size: 13px;
  font-weight: 600;
  white-space: nowrap;
}

.channel-meta dd {
  margin: 0;
  color: var(--color-muted);
  font-size: 14px;
}

.sample-groups {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
}

.sample-group {
  padding: 16px 18px;
  background-color: var(--color-surface);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
}

.sample-group-title {
  font-size: 16px;
  font-weight: 700;
  color: var(--color-ink);
  padding-bottom: 10px;
  border-bottom: 1px solid var(--color-line);
}

.sample-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-top: 12px;
}

.sample-item {
  color: var(--color-muted);
  font-size: 14px;
  line-height: 1.7;
}

.sample-name {
  color: var(--color-ink-soft);
  font-weight: 600;
}

.sample-note {
  color: var(--color-muted);
}

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

.map-row {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(0, 1fr) minmax(0, 1.4fr);
  gap: 8px 18px;
  padding: 12px 18px;
  border-bottom: 1px solid var(--color-line);
  font-size: 14px;
}

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

.map-head {
  background-color: #f1f3f6;
  color: var(--color-ink);
  font-weight: 600;
}

.map-col {
  color: var(--color-muted);
  min-width: 0;
}

.map-head .map-col {
  color: var(--color-ink);
}

/* ---- 内页：专题合集 ---- */
.topic-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 22px;
}

.topic-list-section .topic-media {
  border: 0;
  border-bottom: 1px solid var(--color-line);
  border-radius: 0;
}

.topic-list-section .topic-media img {
  width: 100%;
  aspect-ratio: 16 / 9;
  height: auto;
  object-fit: cover;
}

.topic-body {
  padding: 16px 18px 18px;
}

.topic-body .topic-scope,
.topic-body .topic-count,
.topic-body .topic-sample {
  margin-top: 8px;
}

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

.boundary-col {
  padding: 18px;
  background-color: var(--color-surface);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
}

.boundary-title {
  font-size: 16px;
  font-weight: 700;
  color: var(--color-ink);
  margin-bottom: 12px;
}

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

/* ---- 内页：更新记录 ---- */
.page-updates .page-layout {
  grid-template-columns: minmax(0, 1fr) minmax(260px, 0.42fr);
  gap: 28px;
  align-items: start;
}

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

.layout-aside {
  min-width: 0;
  padding: 18px;
  background-color: var(--color-surface);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
}

.aside-title {
  font-size: 16px;
  font-weight: 700;
  color: var(--color-ink);
}

.aside-figure {
  margin-top: 14px;
}

.aside-figure img {
  width: 100%;
  aspect-ratio: 4 / 3;
  height: auto;
  object-fit: cover;
}

.aside-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-top: 14px;
}

.aside-item {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  padding-bottom: 8px;
  border-bottom: 1px dashed var(--color-line);
  font-size: 13px;
}

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

.aside-key {
  color: var(--color-muted);
}

.aside-val {
  color: var(--color-ink-soft);
  font-weight: 600;
}

.aside-note {
  margin-top: 12px;
  color: var(--color-muted);
  font-size: 13px;
}

.update-timeline .section-intro,
.change-legend .section-intro,
.update-links .section-intro {
  margin-bottom: 20px;
}

.update-month {
  padding: 20px;
  background-color: var(--color-surface);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
}

.update-timeline .update-month + .update-month {
  margin-top: 18px;
}

.update-month-head {
  padding-bottom: 12px;
  border-bottom: 1px solid var(--color-line);
}

.update-timeline .month-label {
  font-size: 16px;
  font-weight: 700;
  color: var(--color-ink);
}

.month-summary {
  margin-top: 4px;
  color: var(--color-muted);
  font-size: 13px;
}

.update-timeline .update-list {
  gap: 14px;
  margin-top: 14px;
}

.update-timeline .update-item {
  display: grid;
  grid-template-columns: auto auto;
  justify-content: start;
  align-items: baseline;
  gap: 6px 10px;
}

.update-timeline .update-item .update-desc {
  grid-column: 1 / -1;
}

.legend-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
}

.legend-col {
  padding: 16px 18px;
  background-color: var(--color-surface);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
}

.legend-name {
  font-size: 15px;
  font-weight: 700;
  color: var(--color-ink);
}

.legend-desc {
  margin-top: 8px;
  color: var(--color-muted);
  font-size: 14px;
}

.link-rows {
  display: flex;
  flex-direction: column;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  background-color: var(--color-surface);
  overflow: hidden;
}

.link-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(180px, 0.5fr);
  gap: 8px 20px;
  align-items: center;
  padding: 13px 18px;
  border-bottom: 1px solid var(--color-line);
}

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

.link-row-desc {
  color: var(--color-muted);
  font-size: 14px;
}

.link-row-target {
  color: var(--color-teal);
  font-size: 14px;
  font-weight: 600;
}

/* ---- 内页：观看指引 ---- */
.guide-prep .section-desc,
.guide-check .section-desc,
.guide-faq .section-desc,
.guide-related .section-desc {
  margin-bottom: 20px;
}

.guide-media {
  margin-bottom: 22px;
}

.guide-media img {
  width: 100%;
  aspect-ratio: 21 / 9;
  height: auto;
  object-fit: cover;
}

.prep-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
  counter-reset: prep;
}

.prep-item {
  position: relative;
  padding: 16px 18px 16px 56px;
  background-color: var(--color-surface);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
}

.prep-item::before {
  counter-increment: prep;
  content: counter(prep);
  position: absolute;
  left: 16px;
  top: 16px;
  width: 26px;
  height: 26px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background-color: var(--color-teal-soft);
  color: var(--color-teal);
  font-size: 13px;
  font-weight: 700;
}

.prep-name {
  font-size: 16px;
  font-weight: 700;
  color: var(--color-ink);
}

.prep-item p {
  margin-top: 6px;
  color: var(--color-muted);
  font-size: 14px;
}

.step-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
  counter-reset: step;
}

.step-item {
  position: relative;
  padding: 16px 18px 16px 62px;
  background-color: var(--color-surface);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
}

.step-index {
  position: absolute;
  left: 18px;
  top: 16px;
  width: 28px;
  height: 28px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
  background-color: var(--color-ink);
  color: #ffffff;
  font-size: 13px;
  font-weight: 700;
}

.step-name {
  font-size: 16px;
  font-weight: 700;
  color: var(--color-ink);
}

.step-desc {
  margin-top: 6px;
  color: var(--color-muted);
  font-size: 14px;
}

.step-desc a {
  color: var(--color-teal);
  text-decoration: underline;
  text-underline-offset: 2px;
}

.step-check {
  margin-top: 8px;
  padding-left: 12px;
  border-left: 3px solid var(--color-teal-soft);
  color: var(--color-muted);
  font-size: 13px;
}

.related-links {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 14px;
}

.related-links li a {
  display: block;
  padding: 12px 14px;
  background-color: var(--color-surface);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  color: var(--color-ink-soft);
  font-size: 14px;
  font-weight: 600;
}

.related-links li a:hover,
.related-links li a:focus-visible {
  border-color: var(--color-ink);
  color: var(--color-ink);
}

/* ---- 404 ---- */
.site-error {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

.error-main {
  flex: 1 1 auto;
  max-width: var(--container);
  width: 100%;
  margin: 0 auto;
  padding: 56px 20px 64px;
}

.error-hero {
  padding: 32px 28px;
  background-color: var(--color-surface);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-lg);
}

.error-code {
  color: var(--color-accent);
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.04em;
}

.error-hero h1 {
  margin-top: 8px;
  font-size: 32px;
  font-weight: 700;
  color: var(--color-ink);
}

.error-text {
  margin-top: 10px;
  max-width: 62ch;
  color: var(--color-muted);
  font-size: 15px;
}

.error-hero .btn {
  margin-top: 20px;
}

.error-paths {
  margin-top: 32px;
}

.error-paths h2 {
  font-size: 20px;
  font-weight: 700;
  color: var(--color-ink);
}

.error-path-list {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 14px;
  margin-top: 16px;
}

.error-path-list li a {
  display: block;
  padding: 12px 14px;
  background-color: var(--color-surface);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  color: var(--color-ink-soft);
  font-size: 14px;
  font-weight: 600;
}

.error-path-list li a:hover,
.error-path-list li a:focus-visible {
  border-color: var(--color-ink);
  color: var(--color-ink);
}

/* --------------------------------------------------------------------------
   5. responsive —— 平板与手机
   -------------------------------------------------------------------------- */

@media (max-width: 960px) {
  .footer-inner {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

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

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

@media (max-width: 768px) {
  body {
    font-size: 15px;
  }

  /* 页头与抽屉导航 */
  .header-inner {
    flex-wrap: wrap;
    gap: 10px;
    padding: 10px 16px;
  }

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

  .nav-toggle {
    display: flex;
  }

  .site-nav {
    flex: 1 1 100%;
    margin-left: 0;
  }

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

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

  .nav-link {
    min-height: 44px;
    display: flex;
    align-items: center;
    padding: 10px 12px;
    font-size: 15px;
  }

  /* 主容器 */
  .inner-main {
    padding: 0 16px 44px;
  }

  .top-notice p {
    padding: 6px 16px;
    font-size: 12px;
  }

  /* 标题区 */
  .page-header {
    padding: 14px 0 18px;
    margin-bottom: 22px;
  }

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

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

  /* 首页首屏 */
  .hero-inner {
    grid-template-columns: minmax(0, 1fr);
    gap: 20px;
    padding: 26px 16px 22px;
  }

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

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

  .hero-tags {
    padding: 0 16px 22px;
  }

  /* 区块 */
  .section {
    padding: 28px 0;
  }

  .section-head h2,
  .section-title {
    font-size: 20px;
  }

  .section-head p,
  .section-desc,
  .section-intro {
    font-size: 14px;
  }

  /* 首页频道索引 */
  .channel-index .channel-row {
    grid-template-columns: minmax(0, 1fr);
    gap: 4px;
    padding: 13px 15px;
  }

  /* 首页专题卡片 */
  .topic-cards,
  .topic-grid,
  .update-groups,
  .guide-columns,
  .sample-groups,
  .boundary-columns,
  .legend-grid,
  .prep-list {
    grid-template-columns: minmax(0, 1fr);
  }

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

  /* 内页频道总表 */
  .channel-table .channel-row {
    grid-template-columns: minmax(0, 1fr);
    gap: 10px;
    padding: 14px 15px;
  }

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

  /* 内页映射表 */
  .map-row {
    grid-template-columns: minmax(0, 1fr);
    gap: 4px;
    padding: 12px 15px;
  }

  .map-head {
    display: none;
  }

  /* 更新记录 */
  .update-timeline .update-item {
    grid-template-columns: auto minmax(0, 1fr);
  }

  .link-row {
    grid-template-columns: minmax(0, 1fr);
    gap: 6px;
    padding: 12px 15px;
  }

  /* 观看指引 */
  .prep-item {
    padding: 15px 16px 15px 52px;
  }

  .step-item {
    padding: 15px 16px 15px 56px;
  }

  /* 页脚 */
  .footer-inner {
    grid-template-columns: minmax(0, 1fr);
    gap: 22px;
    padding: 28px 16px 22px;
  }

  .footer-col a {
    min-height: 44px;
    display: flex;
    align-items: center;
    padding: 8px 0;
  }

  /* 404 */
  .error-main {
    padding: 32px 16px 48px;
  }

  .error-hero {
    padding: 22px 18px;
  }

  .error-hero h1 {
    font-size: 26px;
  }
}

@media (max-width: 420px) {
  .index-columns,
  .related-links,
  .error-path-list {
    grid-template-columns: minmax(0, 1fr);
  }

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

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

  .brand-slogan {
    display: none;
  }
}

/* 尊重减少动效偏好 */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
  }

  .topic-card:hover {
    transform: none;
  }
}