/* ==========================================================================
   光棍视频 tuiketuan.cn — 全站样式
   分组：base / layout / components / pages / responsive
   ========================================================================== */

/* --------------------------------------------------------------------------
   base — 变量、重置、排版
   -------------------------------------------------------------------------- */
:root {
  --color-primary: #1f6f6b;
  --color-primary-dark: #175451;
  --color-accent: #e8a33d;
  --color-bg: #f7f5ef;
  --color-surface: #ffffff;
  --color-text: #22302f;
  --color-text-soft: #55655f;
  --color-line: #d8d3c6;
  --color-line-strong: #bcb5a3;
  --color-tint: #eef4f2;
  --radius-sm: 4px;
  --radius-md: 6px;
  --radius-lg: 8px;
  --shadow-soft: 0 1px 2px rgba(34, 48, 47, 0.06);
  --shadow-lift: 0 6px 18px rgba(31, 111, 107, 0.12);
  --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;
  --font-mono: "SFMono-Regular", "JetBrains Mono", Consolas, "Liberation Mono", Menlo, monospace;
  --container: 1120px;
  --gutter: 24px;
}

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

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

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

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

p {
  margin: 0;
}

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

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

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

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

figure {
  margin: 0;
}

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

button {
  font: inherit;
  color: inherit;
}

strong {
  font-weight: 700;
  color: var(--color-text);
}

: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;
}

/* --------------------------------------------------------------------------
   layout — 页头、导航、主容器、面包屑、页脚骨架
   -------------------------------------------------------------------------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 30;
  background-color: var(--color-surface);
  border-bottom: 1px solid var(--color-line);
}

.header-inner {
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 var(--gutter);
  min-height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 6px 0;
  font-size: 20px;
  font-weight: 700;
  color: var(--color-primary);
  letter-spacing: 0;
  white-space: nowrap;
}

.brand::before {
  content: "";
  width: 10px;
  height: 22px;
  border-radius: 2px;
  background-color: var(--color-accent);
}

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

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

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

.nav-link {
  display: inline-block;
  padding: 10px 12px;
  border-radius: var(--radius-sm);
  font-size: 15px;
  color: var(--color-text);
  white-space: nowrap;
}

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

.nav-link.is-current {
  color: var(--color-primary);
  font-weight: 700;
  box-shadow: inset 0 -2px 0 var(--color-primary);
}

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

.nav-toggle-bar {
  display: block;
  width: 22px;
  height: 2px;
  background-color: var(--color-text);
}

.site-main {
  display: block;
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: 32px var(--gutter) 56px;
}

.home-main {
  padding-top: 28px;
}

.inner-main {
  padding-top: 24px;
}

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  color: var(--color-text-soft);
  margin-bottom: 16px;
}

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

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

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

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

.page-header {
  padding-bottom: 20px;
  margin-bottom: 28px;
  border-bottom: 1px solid var(--color-line);
}

.page-title {
  font-size: 32px;
  line-height: 1.3;
  font-weight: 700;
  color: var(--color-text);
}

.page-description {
  margin-top: 12px;
  max-width: 68ch;
  font-size: 16px;
  line-height: 1.75;
  color: var(--color-text-soft);
}

.section {
  margin-bottom: 44px;
}

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

.section-title {
  font-size: 22px;
  line-height: 1.4;
  font-weight: 700;
  color: var(--color-text);
}

.section-lead,
.section-intro,
.section-note {
  margin-top: 12px;
  max-width: 68ch;
  font-size: 16px;
  line-height: 1.75;
  color: var(--color-text-soft);
}

.section-lead a,
.section-intro a,
.section-note a {
  font-weight: 700;
}

/* 页脚 */
.site-footer {
  background-color: var(--color-surface);
  border-top: 1px solid var(--color-line);
  color: var(--color-text-soft);
}

.footer-inner {
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: 40px var(--gutter) 28px;
  display: grid;
  grid-template-columns: minmax(220px, 1.4fr) repeat(4, minmax(120px, 1fr));
  gap: 28px 24px;
}

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

.footer-logo {
  font-size: 18px;
  font-weight: 700;
  color: var(--color-primary);
}

.footer-desc {
  margin-top: 10px;
  font-size: 14px;
  line-height: 1.65;
}

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

.footer-group-title {
  font-size: 15px;
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: 12px;
}

.footer-links {
  display: grid;
  gap: 8px;
}

.footer-links a {
  display: inline-block;
  padding: 4px 0;
  font-size: 14px;
  color: var(--color-text-soft);
}

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

.footer-bottom {
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: 16px var(--gutter) 28px;
  border-top: 1px solid var(--color-line);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 8px 20px;
  font-size: 13px;
  color: var(--color-text-soft);
}

.footer-note,
.footer-copy {
  margin: 0;
}

/* --------------------------------------------------------------------------
   components — 通用按钮、链接、卡片、表格、编号步骤
   -------------------------------------------------------------------------- */
.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: 700;
  text-align: center;
  transition: background-color 0.18s ease, border-color 0.18s ease, transform 0.18s ease;
}

.btn:hover,
.btn:focus-visible {
  text-decoration: none;
}

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

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

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

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

.text-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  min-height: 44px;
  font-size: 15px;
  font-weight: 700;
  color: var(--color-primary);
}

.text-link::after {
  content: "→";
  font-size: 14px;
}

.inline-cta {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  margin-top: 16px;
  padding: 10px 22px;
  border: 1px solid var(--color-primary);
  border-radius: var(--radius-md);
  font-size: 15px;
  font-weight: 700;
  color: var(--color-primary);
}

.inline-cta:hover,
.inline-cta:focus-visible {
  background-color: var(--color-primary);
  color: #ffffff;
  text-decoration: none;
}

.entry-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 10px 22px;
  background-color: var(--color-primary);
  border-radius: var(--radius-md);
  font-size: 15px;
  font-weight: 700;
  color: #ffffff;
}

.entry-link:hover,
.entry-link:focus-visible {
  background-color: var(--color-primary-dark);
  color: #ffffff;
  text-decoration: none;
}

/* 通用图片容器 */
.media-figure,
.channel-figure,
.topic-media,
.hero-media,
.path-figure,
.guide-figure,
.feedback-figure {
  overflow: hidden;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-lg);
  background-color: var(--color-tint);
}

.media-figure img,
.channel-figure img,
.topic-media img,
.hero-media img,
.path-figure img,
.guide-figure img,
.feedback-figure img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.media-figure figcaption,
.channel-figure figcaption,
.path-figure figcaption,
.guide-figure figcaption,
.figure-caption {
  padding: 10px 14px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--color-text-soft);
  border-top: 1px solid var(--color-line);
}

/* 字段表 */
.field-table {
  font-size: 15px;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  background-color: var(--color-surface);
}

.field-table th,
.field-table td {
  padding: 12px 14px;
  text-align: left;
  vertical-align: top;
  border-bottom: 1px solid var(--color-line);
}

.field-table thead th {
  background-color: var(--color-tint);
  font-size: 14px;
  font-weight: 700;
  color: var(--color-text);
  white-space: nowrap;
}

.field-table tbody th {
  font-weight: 700;
  color: var(--color-text);
  white-space: nowrap;
  font-variant-numeric: tabular-nums;
}

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

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

.field-table caption,
.field-table-caption,
.map-caption {
  padding: 12px 14px 0;
  text-align: left;
  font-size: 13px;
  color: var(--color-text-soft);
}

/* 编号步骤（首页概览与指引页共用骨架） */
.step-list {
  display: grid;
  gap: 14px;
}

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

.step-num,
.step-index {
  flex: 0 0 auto;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 34px;
  height: 34px;
  border-radius: 50%;
  background-color: var(--color-accent);
  color: #ffffff;
  font-family: var(--font-mono);
  font-size: 15px;
  font-weight: 700;
  line-height: 1;
}

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

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

.step-desc,
.step-text {
  margin-top: 6px;
  font-size: 15px;
  line-height: 1.7;
  color: var(--color-text-soft);
}

/* 延伸阅读列表 */
.related-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 12px;
}

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

.related-list a {
  display: flex;
  align-items: center;
  min-height: 48px;
  padding: 12px 16px;
  background-color: var(--color-surface);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  font-size: 15px;
  font-weight: 700;
  color: var(--color-text);
}

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

/* --------------------------------------------------------------------------
   pages — 首页
   -------------------------------------------------------------------------- */
.hero {
  margin-bottom: 44px;
}

.hero-inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: 32px;
  align-items: center;
}

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

.hero-eyebrow {
  display: inline-block;
  padding: 4px 12px;
  border: 1px solid var(--color-line-strong);
  border-radius: 999px;
  font-size: 13px;
  font-weight: 700;
  color: var(--color-primary);
  background-color: var(--color-surface);
}

.hero-title {
  margin-top: 16px;
  font-size: 32px;
  line-height: 1.3;
  font-weight: 700;
  color: var(--color-text);
}

.hero-lead {
  margin-top: 14px;
  max-width: 60ch;
  font-size: 16px;
  line-height: 1.75;
  color: var(--color-text-soft);
}

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

.hero-media img {
  aspect-ratio: 16 / 10;
}

/* 首页区块标题 */
.section-head {
  margin-bottom: 20px;
}

.section-desc {
  margin-top: 10px;
  max-width: 68ch;
  font-size: 15px;
  line-height: 1.7;
  color: var(--color-text-soft);
}

/* 题材频道总览 */
.channels-overview {
  margin-bottom: 44px;
}

.channel-rows {
  display: grid;
  gap: 12px;
}

.channel-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding: 18px 20px;
  background-color: var(--color-surface);
  border: 1px solid var(--color-line);
  border-left: 3px solid var(--color-primary);
  border-radius: var(--radius-md);
  transition: border-color 0.18s ease, transform 0.18s ease, box-shadow 0.18s ease;
}

.channel-row:hover,
.channel-row:focus-within {
  border-color: var(--color-primary);
  border-left-color: var(--color-accent);
  transform: translateY(-2px);
  box-shadow: var(--shadow-lift);
}

.channel-row-main {
  min-width: 0;
}

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

.channel-orientation {
  margin-top: 6px;
  font-size: 15px;
  line-height: 1.7;
  color: var(--color-text-soft);
}

.channel-audience {
  margin-top: 4px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--color-text-soft);
}

.channel-enter {
  flex: 0 0 auto;
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 0 16px;
  border: 1px solid var(--color-line-strong);
  border-radius: var(--radius-md);
  font-size: 14px;
  font-weight: 700;
  color: var(--color-primary);
  white-space: nowrap;
}

.channel-enter:hover,
.channel-enter:focus-visible {
  background-color: var(--color-primary);
  border-color: var(--color-primary);
  color: #ffffff;
  text-decoration: none;
}

/* 专题速览 */
.topics-preview {
  margin-bottom: 44px;
}

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

.topics-preview .topic-card {
  display: flex;
  flex-direction: column;
  min-width: 0;
  background-color: var(--color-surface);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: border-color 0.18s ease, transform 0.18s ease, box-shadow 0.18s ease;
}

.topics-preview .topic-card:hover,
.topics-preview .topic-card:focus-within {
  border-color: var(--color-primary);
  transform: translateY(-2px);
  box-shadow: var(--shadow-lift);
}

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

.topics-preview .topic-media img {
  aspect-ratio: 16 / 9;
}

.topics-preview .topic-name {
  padding: 16px 18px 0;
  font-size: 17px;
  font-weight: 700;
  color: var(--color-text);
}

.topics-preview .topic-scope {
  padding: 8px 18px 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--color-text-soft);
}

.topics-preview .topic-date {
  padding: 8px 18px 0;
  font-size: 13px;
  color: var(--color-accent);
  font-weight: 700;
  font-variant-numeric: tabular-nums;
}

.topic-enter {
  margin: 14px 18px 18px;
  align-self: flex-start;
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 0 16px;
  border: 1px solid var(--color-line-strong);
  border-radius: var(--radius-md);
  font-size: 14px;
  font-weight: 700;
  color: var(--color-primary);
}

.topic-enter:hover,
.topic-enter:focus-visible {
  background-color: var(--color-primary);
  border-color: var(--color-primary);
  color: #ffffff;
  text-decoration: none;
}

/* 字段摘要 */
.fields-summary {
  margin-bottom: 44px;
}

.field-table-wrap {
  overflow-x: auto;
  border-radius: var(--radius-md);
}

.fields-note {
  margin-top: 14px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--color-text-soft);
}

/* 观看路径概览 */
.guide-steps {
  margin-bottom: 44px;
}

.guide-more,
.log-more {
  margin-top: 16px;
}

/* 范围调整记录 */
.adjustment-log {
  margin-bottom: 8px;
}

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

.log-item {
  display: flex;
  align-items: flex-start;
  gap: 18px;
  padding: 16px 20px;
  background-color: var(--color-surface);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
}

.log-date {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 700;
  color: var(--color-accent);
  font-variant-numeric: tabular-nums;
}

.log-text {
  min-width: 0;
  font-size: 15px;
  line-height: 1.7;
  color: var(--color-text-soft);
}

/* --------------------------------------------------------------------------
   pages — 题材频道
   -------------------------------------------------------------------------- */
.section-division p + p {
  margin-top: 12px;
}

.section-division p {
  max-width: 68ch;
  font-size: 16px;
  line-height: 1.75;
  color: var(--color-text-soft);
}

.channel-block {
  display: grid;
  grid-template-columns: minmax(0, 320px) minmax(0, 1fr);
  gap: 24px;
  align-items: start;
  padding: 20px;
  background-color: var(--color-surface);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-lg);
  transition: border-color 0.18s ease, box-shadow 0.18s ease;
}

.channel-block + .channel-block {
  margin-top: 18px;
}

.channel-block:hover,
.channel-block:focus-within {
  border-color: var(--color-primary);
  box-shadow: var(--shadow-lift);
}

.channel-figure img {
  aspect-ratio: 4 / 3;
}

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

.channel-body .channel-name {
  font-size: 19px;
}

.channel-body .channel-orientation,
.channel-body .channel-focus,
.channel-body .channel-audience {
  margin-top: 10px;
  font-size: 15px;
  line-height: 1.75;
  color: var(--color-text-soft);
}

.channel-entry {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  margin-top: 16px;
  padding: 0 18px;
  border: 1px solid var(--color-primary);
  border-radius: var(--radius-md);
  font-size: 14px;
  font-weight: 700;
  color: var(--color-primary);
}

.channel-entry:hover,
.channel-entry:focus-visible {
  background-color: var(--color-primary);
  color: #ffffff;
  text-decoration: none;
}

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

.diff-column {
  min-width: 0;
  padding: 20px;
  background-color: var(--color-surface);
  border: 1px solid var(--color-line);
  border-top: 3px solid var(--color-accent);
  border-radius: var(--radius-md);
}

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

.diff-text {
  margin-top: 10px;
  font-size: 15px;
  line-height: 1.75;
  color: var(--color-text-soft);
}

.diff-hint {
  margin-top: 12px;
  padding-top: 12px;
  border-top: 1px dashed var(--color-line);
  font-size: 14px;
  line-height: 1.7;
  color: var(--color-text-soft);
}

.section-path-note > p {
  max-width: 68ch;
  font-size: 16px;
  line-height: 1.75;
  color: var(--color-text-soft);
}

.section-path-note > p + p {
  margin-top: 12px;
}

.path-figure {
  margin-top: 20px;
  max-width: 760px;
}

.path-figure img {
  aspect-ratio: 16 / 9;
}

.section-related {
  margin-bottom: 0;
}

/* --------------------------------------------------------------------------
   pages — 专题片单
   -------------------------------------------------------------------------- */
.topic-method > p,
.date-note > p {
  max-width: 68ch;
  font-size: 16px;
  line-height: 1.75;
  color: var(--color-text-soft);
}

.topic-method > p + p,
.date-note > p + p {
  margin-top: 12px;
}

.topic-list .topic-card {
  display: grid;
  grid-template-columns: minmax(0, 300px) minmax(0, 1fr);
  gap: 24px;
  align-items: start;
  padding: 20px;
  background-color: var(--color-surface);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-lg);
  transition: border-color 0.18s ease, box-shadow 0.18s ease;
}

.topic-list .topic-card + .topic-card {
  margin-top: 18px;
}

.topic-list .topic-card:hover,
.topic-list .topic-card:focus-within {
  border-color: var(--color-primary);
  box-shadow: var(--shadow-lift);
}

.topic-list .topic-media img {
  aspect-ratio: 4 / 3;
}

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

.topic-body .topic-name {
  font-size: 19px;
  font-weight: 700;
  color: var(--color-text);
}

.topic-scope,
.topic-composition,
.topic-date {
  margin-top: 10px;
  font-size: 15px;
  line-height: 1.75;
  color: var(--color-text-soft);
}

.field-label {
  display: inline-block;
  margin-right: 8px;
  padding: 2px 8px;
  border: 1px solid var(--color-line-strong);
  border-radius: var(--radius-sm);
  font-size: 13px;
  font-weight: 700;
  color: var(--color-primary);
  background-color: var(--color-tint);
}

.topic-body .topic-date {
  font-variant-numeric: tabular-nums;
  color: var(--color-accent);
  font-weight: 700;
}

.topic-entry {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  margin-top: 16px;
  padding: 0 18px;
  border: 1px solid var(--color-primary);
  border-radius: var(--radius-md);
  font-size: 14px;
  font-weight: 700;
  color: var(--color-primary);
}

.topic-entry:hover,
.topic-entry:focus-visible {
  background-color: var(--color-primary);
  color: #ffffff;
  text-decoration: none;
}

.topic-channel-map > p {
  margin-top: 12px;
  max-width: 68ch;
  font-size: 16px;
  line-height: 1.75;
  color: var(--color-text-soft);
}

.map-table {
  margin-top: 16px;
  font-size: 15px;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  background-color: var(--color-surface);
}

.map-table th,
.map-table td {
  padding: 12px 14px;
  text-align: left;
  border-bottom: 1px solid var(--color-line);
}

.map-table thead th {
  background-color: var(--color-tint);
  font-size: 14px;
  font-weight: 700;
  white-space: nowrap;
}

.map-table tbody td:first-child {
  font-weight: 700;
  color: var(--color-text);
}

.map-table tbody td:last-child {
  color: var(--color-text-soft);
}

.map-table tbody tr:last-child td {
  border-bottom: 0;
}

.map-note {
  margin-top: 12px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--color-text-soft);
}

.related-reading > p {
  margin-top: 12px;
  font-size: 16px;
  line-height: 1.75;
  color: var(--color-text-soft);
}

/* --------------------------------------------------------------------------
   pages — 条目字段说明
   -------------------------------------------------------------------------- */
.field-figure {
  margin: 20px 0 24px;
  max-width: 760px;
}

.field-figure img {
  aspect-ratio: 16 / 9;
}

.field-detail-block {
  margin-top: 16px;
  padding: 18px 20px;
  background-color: var(--color-surface);
  border: 1px solid var(--color-line);
  border-left: 3px solid var(--color-primary);
  border-radius: var(--radius-md);
}

.field-detail-title {
  font-size: 17px;
  font-weight: 700;
  color: var(--color-text);
}

.field-detail-block p {
  margin-top: 8px;
  font-size: 15px;
  line-height: 1.75;
  color: var(--color-text-soft);
}

.rule-list {
  display: grid;
  gap: 14px;
  margin-top: 18px;
}

.rule-item {
  padding: 16px 20px;
  background-color: var(--color-surface);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
}

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

.rule-item p {
  margin-top: 8px;
  font-size: 15px;
  line-height: 1.75;
  color: var(--color-text-soft);
}

.boundary-list {
  display: grid;
  gap: 12px;
  margin-top: 18px;
}

.boundary-item {
  padding: 16px 20px;
  background-color: var(--color-surface);
  border: 1px solid var(--color-line);
  border-left: 3px solid var(--color-accent);
  border-radius: var(--radius-md);
}

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

.boundary-item p {
  margin-top: 8px;
  font-size: 15px;
  line-height: 1.75;
  color: var(--color-text-soft);
}

.field-feedback > p {
  margin-top: 12px;
  max-width: 68ch;
  font-size: 16px;
  line-height: 1.75;
  color: var(--color-text-soft);
}

/* --------------------------------------------------------------------------
   pages — 观看路径指引
   -------------------------------------------------------------------------- */
.guide-steps-section .step-list {
  margin-top: 18px;
}

.guide-figure {
  margin-top: 24px;
  max-width: 760px;
}

.guide-figure img {
  aspect-ratio: 16 / 9;
}

.pitfall-list {
  display: grid;
  gap: 18px;
  margin-top: 18px;
}

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

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

.pitfall-block {
  margin-top: 14px;
  padding-top: 14px;
  border-top: 1px dashed var(--color-line);
}

.pitfall-block:first-of-type {
  border-top: 0;
  padding-top: 0;
}

.pitfall-label {
  font-size: 14px;
  font-weight: 700;
  color: var(--color-primary);
}

.pitfall-text {
  margin-top: 6px;
  font-size: 15px;
  line-height: 1.75;
  color: var(--color-text-soft);
}

.checklist {
  display: grid;
  gap: 10px;
  margin-top: 18px;
}

.checklist-item {
  position: relative;
  padding: 12px 16px 12px 42px;
  background-color: var(--color-surface);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  font-size: 15px;
  line-height: 1.7;
  color: var(--color-text-soft);
}

.checklist-item::before {
  content: "✓";
  position: absolute;
  left: 16px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--color-accent);
  font-weight: 700;
}

.checklist-note {
  margin-top: 16px;
  padding: 14px 18px;
  background-color: var(--color-tint);
  border-left: 3px solid var(--color-primary);
  border-radius: var(--radius-md);
  font-size: 14px;
  line-height: 1.7;
  color: var(--color-text-soft);
}

.feedback-note-body {
  margin-top: 14px;
}

.feedback-note-text {
  max-width: 68ch;
  font-size: 16px;
  line-height: 1.75;
  color: var(--color-text-soft);
}

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

.feedback-entry {
  margin-top: 20px;
}

.related-section {
  margin-bottom: 0;
}

/* --------------------------------------------------------------------------
   pages — 更正与反馈
   -------------------------------------------------------------------------- */
.feedback-cases-columns {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20px;
  margin-top: 18px;
}

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

.case-column-yes {
  border-top: 3px solid var(--color-primary);
}

.case-column-no {
  border-top: 3px solid var(--color-line-strong);
}

.case-column-title {
  font-size: 17px;
  font-weight: 700;
  color: var(--color-text);
}

.case-list {
  display: grid;
  gap: 10px;
  margin-top: 14px;
}

.case-item {
  position: relative;
  padding-left: 20px;
  font-size: 15px;
  line-height: 1.7;
  color: var(--color-text-soft);
}

.case-item::before {
  content: "";
  position: absolute;
  left: 2px;
  top: 10px;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background-color: var(--color-accent);
}

.feedback-figure {
  margin: 20px 0 22px;
  max-width: 760px;
}

.feedback-figure img {
  aspect-ratio: 16 / 9;
}

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

.info-item {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  padding: 14px 18px;
  background-color: var(--color-surface);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  font-size: 15px;
  line-height: 1.7;
  color: var(--color-text-soft);
}

.info-label {
  flex: 0 0 auto;
  min-width: 96px;
  font-weight: 700;
  color: var(--color-primary);
}

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

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

.rule-card-title {
  font-size: 16px;
  font-weight: 700;
  color: var(--color-text);
}

.rule-card-text {
  margin-top: 8px;
  font-size: 15px;
  line-height: 1.75;
  color: var(--color-text-soft);
}

.entry-note .section-text {
  margin-top: 12px;
  max-width: 68ch;
  font-size: 16px;
  line-height: 1.75;
  color: var(--color-text-soft);
}

/* --------------------------------------------------------------------------
   pages — 404
   -------------------------------------------------------------------------- */
.error-main {
  padding-top: 48px;
}

.error-block {
  max-width: 640px;
  padding: 32px;
  background-color: var(--color-surface);
  border: 1px solid var(--color-line);
  border-left: 4px solid var(--color-accent);
  border-radius: var(--radius-lg);
}

.error-code {
  font-family: var(--font-mono);
  font-size: 40px;
  font-weight: 700;
  line-height: 1;
  color: var(--color-accent);
}

.error-block h1 {
  margin-top: 14px;
  font-size: 32px;
  line-height: 1.3;
  font-weight: 700;
  color: var(--color-text);
}

.error-text {
  margin-top: 12px;
  font-size: 16px;
  line-height: 1.75;
  color: var(--color-text-soft);
}

.error-actions {
  margin-top: 22px;
}

.error-help {
  margin-top: 36px;
}

.error-help h2 {
  font-size: 22px;
  line-height: 1.4;
  font-weight: 700;
  color: var(--color-text);
}

.error-links {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 12px;
  margin-top: 18px;
}

.error-links a {
  display: flex;
  align-items: center;
  min-height: 48px;
  padding: 12px 16px;
  background-color: var(--color-surface);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  font-size: 15px;
  font-weight: 700;
  color: var(--color-text);
}

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

/* --------------------------------------------------------------------------
   responsive — 平板与手机
   -------------------------------------------------------------------------- */
@media (max-width: 1024px) {
  .topic-cards,
  .rule-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .footer-inner {
    grid-template-columns: minmax(200px, 1.4fr) repeat(2, minmax(140px, 1fr));
  }
}

@media (max-width: 900px) {
  .header-inner {
    flex-wrap: wrap;
    padding-top: 10px;
    padding-bottom: 10px;
  }

  .nav-toggle {
    display: flex;
  }

  .site-nav {
    flex: 1 0 100%;
    display: block;
  }

  .nav-list {
    display: none;
    width: 100%;
    padding: 8px 0 12px;
    border-top: 1px solid var(--color-line);
  }

  .nav-list.is-open {
    display: grid;
    gap: 2px;
  }

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

  .nav-link {
    display: block;
    padding: 12px 8px;
    font-size: 16px;
  }

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

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

  .hero-title {
    font-size: 28px;
  }

  .channel-block,
  .topic-list .topic-card {
    grid-template-columns: minmax(0, 1fr);
    gap: 18px;
  }

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

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

@media (max-width: 600px) {
  :root {
    --gutter: 16px;
  }

  .site-main {
    padding-top: 20px;
    padding-bottom: 40px;
  }

  .page-title,
  .error-block h1 {
    font-size: 26px;
  }

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

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

  .section {
    margin-bottom: 32px;
  }

  .channel-row {
    flex-direction: column;
    align-items: stretch;
    gap: 14px;
  }

  .channel-enter,
  .topic-enter,
  .channel-entry,
  .topic-entry {
    justify-content: center;
    width: 100%;
    margin-left: 0;
    margin-right: 0;
  }

  .topic-enter {
    margin: 14px 18px 18px;
    width: calc(100% - 36px);
  }

  .topic-cards,
  .rule-grid,
  .diff-grid,
  .feedback-cases-columns {
    grid-template-columns: minmax(0, 1fr);
  }

  .step-item {
    padding: 16px;
  }

  .log-item {
    flex-direction: column;
    gap: 6px;
  }

  .info-item {
    flex-direction: column;
    gap: 4px;
  }

  .info-label {
    min-width: 0;
  }

  .field-table th,
  .field-table td,
  .map-table th,
  .map-table td {
    padding: 10px 12px;
    font-size: 14px;
  }

  .footer-inner {
    grid-template-columns: minmax(0, 1fr);
    padding-top: 28px;
  }

  .footer-bottom {
    flex-direction: column;
    align-items: flex-start;
  }

  .error-block {
    padding: 24px 20px;
  }
}