/* ==========================================================================
   haane.cn 光棍影院 · 全站样式表
   分组：base / layout / components / pages / responsive
   ========================================================================== */

/* ==========================================================================
   base —— 变量、重置、排版基础
   ========================================================================== */
:root {
  --bg-page: #f7faf9;
  --bg-panel: #ffffff;
  --bg-soft: #eaf6f3;
  --ink-main: #1f2d2b;
  --ink-sub: #4d605c;
  --ink-mute: #6c807b;
  --brand: #1f7a6b;
  --brand-strong: #155c51;
  --brand-soft: #3aa89a;
  --line: #dcebe7;
  --line-strong: #c3ddd6;
  --radius: 8px;
  --radius-sm: 6px;
  --shadow-soft: 0 1px 2px rgba(31, 45, 43, 0.05), 0 6px 18px rgba(31, 45, 43, 0.05);
  --container: 1120px;
  --gutter: 24px;
  --font-sans: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Source Han Sans SC",
    "Noto Sans CJK SC", "WenQuanYi Micro Hei", system-ui, -apple-system, "Segoe UI", Roboto,
    Helvetica, Arial, sans-serif;
}

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

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

body {
  margin: 0;
  background-color: var(--bg-page);
  color: var(--ink-main);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.7;
  font-weight: 400;
  -webkit-font-smoothing: antialiased;
}

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

p {
  margin: 0;
}

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

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

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

a:focus-visible,
button:focus-visible,
summary:focus-visible {
  outline: 2px solid var(--brand-soft);
  outline-offset: 2px;
}

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

figure {
  margin: 0;
}

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

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

/* ==========================================================================
   layout —— 骨架：页头、导航、主容器、面包屑、页标题区、页脚
   ========================================================================== */

/* 页头 —— 全站统一 */
.site-header {
  position: sticky;
  top: 0;
  z-index: 40;
  background-color: rgba(247, 250, 249, 0.94);
  border-bottom: 1px solid var(--line);
  backdrop-filter: saturate(140%) blur(6px);
}

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

.brand {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  color: var(--ink-main);
  font-size: 19px;
  font-weight: 700;
  letter-spacing: 0;
  white-space: nowrap;
}

.brand::before {
  content: "";
  width: 10px;
  height: 22px;
  margin-right: 10px;
  border-radius: 3px;
  background-color: var(--brand);
}

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

/* 主导航 —— 全站统一 */
.site-nav {
  display: flex;
  align-items: center;
}

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

.nav-list a {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 0 14px;
  border-radius: var(--radius-sm);
  color: var(--ink-sub);
  font-size: 15px;
  white-space: nowrap;
}

.nav-list a:hover,
.nav-list a:focus-visible {
  color: var(--brand-strong);
  background-color: var(--bg-soft);
}

.nav-list a.is-current {
  color: var(--brand-strong);
  background-color: var(--bg-soft);
  font-weight: 700;
}

.nav-toggle {
  display: none;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  padding: 0;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius-sm);
  background-color: var(--bg-panel);
  color: var(--ink-main);
  font-size: 15px;
  cursor: pointer;
}

.nav-toggle::before {
  content: "菜单";
  font-size: 14px;
}

.nav-toggle:hover {
  border-color: var(--brand-soft);
  color: var(--brand-strong);
}

/* 主内容区 —— 全站统一宽度与边距 */
.site-main {
  display: block;
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: 32px var(--gutter) 56px;
}

.inner-main {
  padding-top: 20px;
}

/* 面包屑 —— 全站统一 */
.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin-bottom: 14px;
  color: var(--ink-mute);
  font-size: 14px;
  line-height: 1.6;
}

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

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

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

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

/* 内页标题区 —— 全站统一 */
.page-header {
  padding-bottom: 22px;
  margin-bottom: 26px;
  border-bottom: 1px solid var(--line);
}

.page-title {
  margin: 0 0 10px;
  font-size: 30px;
  font-weight: 700;
  line-height: 1.3;
  color: var(--ink-main);
}

.page-description {
  max-width: 860px;
  color: var(--ink-sub);
  font-size: 16px;
  line-height: 1.75;
}

/* 页脚 —— 全站统一 */
.site-footer {
  margin-top: 24px;
  border-top: 1px solid var(--line);
  background-color: var(--bg-panel);
}

.footer-inner {
  display: grid;
  grid-template-columns: minmax(220px, 1.4fr) repeat(3, minmax(150px, 1fr));
  gap: 28px 32px;
  max-width: var(--container);
  margin: 0 auto;
  padding: 40px var(--gutter) 28px;
}

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

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

.footer-desc {
  max-width: 320px;
  color: var(--ink-mute);
  font-size: 14px;
  line-height: 1.7;
}

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

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

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

.footer-list a {
  display: inline-block;
  min-height: 22px;
  color: var(--ink-sub);
  font-size: 14px;
  line-height: 1.6;
}

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

.footer-note {
  color: var(--ink-mute);
  font-size: 14px;
  line-height: 1.7;
}

.footer-copy {
  max-width: var(--container);
  margin: 0 auto;
  padding: 16px var(--gutter) 28px;
  border-top: 1px solid var(--line);
  color: var(--ink-mute);
  font-size: 13px;
  line-height: 1.7;
}

/* ==========================================================================
   components —— 通用组件：区块头、卡片、按钮、表格、步骤、更新、FAQ
   ========================================================================== */

/* 区块与区块头 */
.section {
  margin-top: 52px;
}

.section-head {
  margin-bottom: 20px;
}

.section-head h2,
.section-title,
.section > h2 {
  font-size: 23px;
  font-weight: 700;
  line-height: 1.4;
}

.section-lead,
.section-note,
.section-intro {
  max-width: 880px;
  margin-top: 8px;
  color: var(--ink-sub);
  font-size: 15.5px;
  line-height: 1.75;
}

.section-intro strong {
  color: var(--ink-main);
}

.section-more {
  margin-top: 18px;
}

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

.text-link {
  display: inline-flex;
  align-items: center;
  min-height: 24px;
  color: var(--brand);
  font-size: 15px;
  font-weight: 600;
}

.text-link::after {
  content: "→";
  margin-left: 6px;
  font-weight: 400;
  transition: transform 0.18s ease;
}

.text-link:hover::after,
.text-link:focus-visible::after {
  transform: translateX(3px);
}

/* 按钮 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  padding: 0 22px;
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  font-size: 15px;
  font-weight: 600;
  line-height: 1.2;
  text-align: center;
}

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

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

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

.btn-ghost:hover,
.btn-ghost:focus-visible {
  border-color: var(--brand-soft);
  background-color: var(--bg-soft);
  color: var(--brand-strong);
}

/* 图片容器与说明文字 */
.hero-media,
.card-media,
.collection-media,
.channel-visual,
.content-figure,
.section-figure {
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background-color: var(--bg-soft);
}

.hero-media img,
.card-media img,
.collection-media img,
.channel-visual img,
.content-figure img,
.section-figure img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.hero-media figcaption,
.channel-visual figcaption,
.content-figure figcaption,
.section-figure figcaption {
  padding: 10px 14px;
  border-top: 1px solid var(--line);
  background-color: var(--bg-panel);
  color: var(--ink-mute);
  font-size: 13.5px;
  line-height: 1.65;
}

/* 频道行列表（首页与频道页共用基础样式） */
.channel-row {
  display: grid;
  grid-template-columns: minmax(160px, 0.9fr) minmax(0, 1.6fr);
  gap: 8px 28px;
  align-items: start;
  padding: 18px 0;
  border-bottom: 1px solid var(--line);
}

.channel-row:first-child {
  border-top: 1px solid var(--line);
}

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

.channel-desc,
.channel-orientation,
.channel-audience {
  color: var(--ink-sub);
  font-size: 15px;
  line-height: 1.75;
}

.channel-audience {
  color: var(--ink-mute);
}

/* 专题片单卡片 */
.collection-card {
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding: 16px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background-color: var(--bg-panel);
  box-shadow: var(--shadow-soft);
  transition: border-color 0.18s ease, transform 0.18s ease;
}

.collection-card:hover {
  border-color: var(--line-strong);
  transform: translateY(-2px);
}

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

.card-title,
.collection-name {
  font-size: 17px;
  font-weight: 700;
  color: var(--ink-main);
}

.card-scope,
.collection-desc {
  color: var(--ink-sub);
  font-size: 14.5px;
  line-height: 1.75;
}

.card-link,
.collection-link {
  margin-top: auto;
}

/* 字段表格 */
.fields-table-wrap {
  overflow-x: auto;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background-color: var(--bg-panel);
}

.fields-table {
  min-width: 520px;
  font-size: 14.5px;
}

.fields-table caption {
  padding: 14px 16px 12px;
  border-bottom: 1px solid var(--line);
  color: var(--ink-mute);
  font-size: 13.5px;
  text-align: left;
}

.fields-table th,
.fields-table td {
  padding: 12px 16px;
  border-bottom: 1px solid var(--line);
  text-align: left;
  vertical-align: top;
  line-height: 1.7;
}

.fields-table thead th {
  background-color: var(--bg-soft);
  color: var(--ink-main);
  font-size: 14px;
  font-weight: 700;
  white-space: nowrap;
}

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

.fields-table tbody td {
  color: var(--ink-sub);
}

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

/* 收录边界说明 */
.boundary-note {
  padding: 18px 20px;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  background-color: var(--bg-soft);
}

.boundary-note h3,
.boundary-col h3,
.feedback-title {
  margin-bottom: 10px;
  font-size: 16px;
  font-weight: 700;
  color: var(--ink-main);
}

.boundary-list li {
  position: relative;
  padding-left: 16px;
  color: var(--ink-sub);
  font-size: 14.5px;
  line-height: 1.75;
}

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

.boundary-list li::before {
  content: "";
  position: absolute;
  top: 10px;
  left: 0;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background-color: var(--brand-soft);
}

/* 编号步骤清单 */
.step-list {
  display: grid;
  gap: 14px;
  counter-reset: step;
}

.step-item {
  position: relative;
  padding: 18px 20px 18px 62px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background-color: var(--bg-panel);
  counter-increment: step;
}

.step-item::before {
  content: counter(step, decimal-leading-zero);
  position: absolute;
  top: 18px;
  left: 18px;
  width: 30px;
  height: 30px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background-color: var(--bg-soft);
  color: var(--brand-strong);
  font-size: 13px;
  font-weight: 700;
}

.step-name,
.step-title {
  margin-bottom: 6px;
  font-size: 16px;
  font-weight: 700;
  color: var(--ink-main);
}

.step-desc,
.step-text {
  color: var(--ink-sub);
  font-size: 15px;
  line-height: 1.75;
}

.step-text + .step-text {
  margin-top: 6px;
}

/* 更新记录 */
.update-list {
  display: grid;
  gap: 0;
  border-top: 1px solid var(--line);
}

.update-item {
  display: grid;
  grid-template-columns: 130px minmax(0, 1fr);
  gap: 6px 20px;
  padding: 16px 0;
  border-bottom: 1px solid var(--line);
}

.update-date {
  color: var(--brand-strong);
  font-size: 14px;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
}

.update-text {
  color: var(--ink-sub);
  font-size: 15px;
  line-height: 1.75;
}

.update-title {
  margin-bottom: 6px;
  font-size: 15.5px;
  font-weight: 700;
  color: var(--ink-main);
}

/* 反馈说明块 */
.feedback-note {
  margin-top: 22px;
  padding: 18px 20px;
  border-left: 3px solid var(--brand-soft);
  border-radius: 0 var(--radius) var(--radius) 0;
  background-color: var(--bg-soft);
}

.feedback-text {
  color: var(--ink-sub);
  font-size: 14.5px;
  line-height: 1.75;
}

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

/* 问答折叠 */
.faq-list {
  display: grid;
  gap: 12px;
}

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

.faq-question {
  position: relative;
  padding: 16px 48px 16px 20px;
  color: var(--ink-main);
  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: "+";
  position: absolute;
  top: 50%;
  right: 20px;
  transform: translateY(-50%);
  color: var(--brand);
  font-size: 20px;
  font-weight: 700;
  line-height: 1;
}

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

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

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

.faq-answer p {
  padding-top: 14px;
  color: var(--ink-sub);
  font-size: 15px;
  line-height: 1.78;
}

/* 相关链接 */
.related-links {
  padding: 18px 20px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background-color: var(--bg-panel);
}

.related-title {
  margin-bottom: 10px;
  font-size: 16px;
  font-weight: 700;
  color: var(--ink-main);
}

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

.related-list a {
  display: inline-block;
  min-height: 22px;
  color: var(--brand);
  font-size: 14.5px;
  font-weight: 600;
}

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

/* ==========================================================================
   pages —— 页面级模块
   ========================================================================== */

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

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(0, 1fr);
  gap: 36px;
  align-items: center;
  padding-bottom: 8px;
}

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

.hero-eyebrow {
  margin-bottom: 10px;
  color: var(--brand);
  font-size: 14px;
  font-weight: 700;
}

.hero-title {
  margin-bottom: 14px;
  font-size: 34px;
  font-weight: 700;
  line-height: 1.3;
  color: var(--ink-main);
}

.hero-text {
  max-width: 560px;
  color: var(--ink-sub);
  font-size: 16px;
  line-height: 1.8;
}

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

.hero-media {
  aspect-ratio: 4 / 3;
}

/* 首页 · 题材频道方向总览 */
.channels-overview .channel-rows {
  border-top: 1px solid var(--line);
}

.channels-overview .channel-row {
  grid-template-columns: minmax(150px, 0.8fr) minmax(0, 1.7fr) minmax(0, 1fr);
}

.channels-overview .channel-name {
  grid-row: span 2;
  padding-top: 2px;
}

/* 首页 · 专题片单速览 */
.collection-cards {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 20px;
}

/* 首页 · 字段与收录边界摘要 */
.fields-layout {
  display: grid;
  grid-template-columns: minmax(0, 1.55fr) minmax(0, 1fr);
  gap: 24px;
  align-items: start;
}

/* 首页 · 查阅路径三步 */
.path-steps .step-list {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.path-steps .step-item {
  padding: 20px;
}

.path-steps .step-item::before {
  position: static;
  display: flex;
  width: 32px;
  height: 32px;
  margin-bottom: 12px;
}

/* 首页 · 更新记录 */
.updates .update-list {
  border-top: 1px solid var(--line);
}

/* ---------- 题材频道页 ---------- */
.channels-list-section > h2,
.channels-visual-section > h2,
.channel-map-section > h2,
.channels-tips > h2 {
  font-size: 22px;
  font-weight: 700;
  line-height: 1.4;
}

.channel-row-list {
  margin-top: 18px;
  border-top: 1px solid var(--line);
}

.channel-row-list .channel-row {
  grid-template-columns: minmax(0, 1.6fr) minmax(0, 1fr);
  gap: 10px 32px;
}

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

.channel-row-side {
  min-width: 0;
  padding-left: 20px;
  border-left: 1px solid var(--line);
}

.channels-visual-section,
.channel-map-section,
.channels-tips {
  margin-top: 48px;
}

.channel-visual-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 20px;
  margin-top: 18px;
}

.channel-visual {
  aspect-ratio: 16 / 10;
}

.channel-visual figcaption {
  border-top: 0;
  background-color: transparent;
  padding-top: 0;
}

/* 频道与片单对应表 */
.channel-map-table {
  margin-top: 18px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background-color: var(--bg-panel);
  overflow: hidden;
}

.channel-map-head,
.channel-map-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1.4fr) minmax(0, 1.1fr);
}

.channel-map-head {
  background-color: var(--bg-soft);
}

.channel-map-row + .channel-map-row {
  border-top: 1px solid var(--line);
}

.channel-map-cell {
  padding: 12px 16px;
  color: var(--ink-sub);
  font-size: 14.5px;
  line-height: 1.7;
}

.channel-map-head .channel-map-cell {
  color: var(--ink-main);
  font-weight: 700;
  font-size: 14px;
}

.channel-map-row .channel-map-cell:first-child {
  color: var(--ink-main);
  font-weight: 600;
}

/* 频道页提示条 */
.channels-tips {
  padding: 20px 22px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background-color: var(--bg-soft);
}

.tips-list {
  margin-top: 12px;
}

.tips-list li {
  color: var(--ink-sub);
  font-size: 14.5px;
  line-height: 1.78;
}

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

/* ---------- 专题片单页 ---------- */
.collections-list > h2,
.collection-order > h2 {
  font-size: 22px;
  font-weight: 700;
  line-height: 1.4;
}

.collections-list .collection-card {
  display: grid;
  grid-template-columns: minmax(0, 0.85fr) minmax(0, 1.5fr);
  gap: 20px;
  align-items: start;
  margin-top: 18px;
  padding: 18px;
}

.collections-list .collection-media {
  aspect-ratio: 16 / 10;
}

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

.collection-body .collection-name {
  margin-bottom: 8px;
}

.collection-meta {
  display: grid;
  grid-template-columns: minmax(80px, auto) minmax(0, 1fr);
  gap: 6px 16px;
  margin: 14px 0 0;
  padding-top: 12px;
  border-top: 1px solid var(--line);
}

.collection-meta dt {
  color: var(--ink-mute);
  font-size: 14px;
  line-height: 1.7;
}

.collection-meta dd {
  margin: 0;
  color: var(--ink-sub);
  font-size: 14.5px;
  line-height: 1.7;
}

.collection-order {
  margin-top: 48px;
}

.collection-order .step-list {
  margin-top: 18px;
}

/* ---------- 条目字段说明页 ---------- */
.fields-table-section > h2,
.fields-examples > h2,
.fields-boundary > h2 {
  font-size: 22px;
  font-weight: 700;
  line-height: 1.4;
}

.fields-table-section .fields-table-wrap {
  margin-top: 18px;
}

.fields-table-caption {
  font-weight: 400;
}

.content-figure {
  margin-top: 22px;
}

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

.fields-examples,
.fields-boundary {
  margin-top: 48px;
}

.example-list {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 20px;
  margin-top: 18px;
}

.example-item {
  padding: 18px 20px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background-color: var(--bg-panel);
}

.example-item h3 {
  margin-bottom: 8px;
  font-size: 16px;
  font-weight: 700;
  color: var(--ink-main);
}

.example-item p {
  color: var(--ink-sub);
  font-size: 14.5px;
  line-height: 1.75;
}

.fields-examples .related-links {
  margin-top: 24px;
}

.boundary-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 24px;
  margin-top: 18px;
}

.boundary-col {
  padding: 18px 20px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background-color: var(--bg-panel);
}

.fields-boundary .boundary-note {
  margin-top: 22px;
  background-color: var(--bg-soft);
}

/* ---------- 观看指南页 ---------- */
.path-steps-section .step-list {
  margin-top: 18px;
}

.path-steps-section .step-item {
  padding-left: 74px;
}

.step-index {
  position: absolute;
  top: 18px;
  left: 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 34px;
  height: 34px;
  border-radius: 50%;
  background-color: var(--bg-soft);
  color: var(--brand-strong);
  font-size: 14px;
  font-weight: 700;
}

.path-steps-section .step-item::before {
  content: none;
}

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

.section-figure {
  margin-top: 24px;
}

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

.updates-section {
  margin-top: 52px;
}

.updates-section .update-list {
  margin-top: 18px;
}

.updates-section .feedback-note {
  margin-top: 24px;
}

.faq-section {
  margin-top: 52px;
}

.faq-section .faq-list {
  margin-top: 18px;
}

/* ---------- 404 页 ---------- */
.error-main {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 52vh;
}

.error-block {
  width: 100%;
  max-width: 640px;
  padding: 32px 28px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background-color: var(--bg-panel);
  text-align: left;
}

.error-code {
  margin-bottom: 8px;
  color: var(--brand);
  font-size: 15px;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
}

.error-block h1 {
  margin-bottom: 12px;
  font-size: 26px;
  font-weight: 700;
  line-height: 1.35;
}

.error-desc {
  color: var(--ink-sub);
  font-size: 15.5px;
  line-height: 1.75;
}

.error-tips {
  margin-top: 18px;
  padding-top: 16px;
  border-top: 1px solid var(--line);
}

.error-tips li {
  position: relative;
  padding-left: 16px;
  color: var(--ink-sub);
  font-size: 14.5px;
  line-height: 1.75;
}

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

.error-tips li::before {
  content: "";
  position: absolute;
  top: 10px;
  left: 0;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background-color: var(--brand-soft);
}

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

/* ==========================================================================
   responsive —— 1024px / 768px / 390px
   ========================================================================== */

@media (max-width: 1024px) {
  .hero {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    gap: 28px;
  }

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

  .fields-layout {
    grid-template-columns: minmax(0, 1.3fr) minmax(0, 1fr);
    gap: 20px;
  }

  .footer-inner {
    grid-template-columns: minmax(220px, 1.4fr) repeat(2, minmax(150px, 1fr));
  }
}

@media (max-width: 768px) {
  :root {
    --gutter: 18px;
  }

  body {
    font-size: 15.5px;
  }

  .header-inner {
    flex-wrap: wrap;
    gap: 12px;
    padding-top: 12px;
    padding-bottom: 12px;
  }

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

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

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

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

  .nav-list a {
    min-height: 46px;
    padding: 0 12px;
  }

  .site-main {
    padding-top: 22px;
    padding-bottom: 40px;
  }

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

  .hero {
    grid-template-columns: minmax(0, 1fr);
    gap: 22px;
  }

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

  .hero-actions .btn {
    flex: 1 1 200px;
  }

  .section {
    margin-top: 40px;
  }

  .section-head h2,
  .section-title,
  .section > h2,
  .channels-list-section > h2,
  .channels-visual-section > h2,
  .channel-map-section > h2,
  .channels-tips > h2,
  .collections-list > h2,
  .collection-order > h2,
  .fields-table-section > h2,
  .fields-examples > h2,
  .fields-boundary > h2 {
    font-size: 20px;
  }

  /* 频道行在窄屏改为上下结构 */
  .channels-overview .channel-row,
  .channel-row-list .channel-row {
    grid-template-columns: minmax(0, 1fr);
    gap: 6px;
  }

  .channels-overview .channel-name {
    grid-row: auto;
  }

  .channel-row-side {
    padding-left: 0;
    border-left: 0;
  }

  .collection-cards,
  .channel-visual-grid,
  .example-list,
  .boundary-grid,
  .path-steps .step-list {
    grid-template-columns: minmax(0, 1fr);
  }

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

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

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

  .channel-map-table {
    overflow-x: auto;
  }

  .channel-map-head,
  .channel-map-row {
    grid-template-columns: minmax(110px, 1fr) minmax(150px, 1.4fr) minmax(120px, 1.1fr);
    min-width: 480px;
  }

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

  .footer-desc {
    max-width: none;
  }

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

  .error-block h1 {
    font-size: 22px;
  }
}

@media (max-width: 480px) {
  .brand {
    font-size: 17px;
  }

  .hero-title {
    font-size: 23px;
  }

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

  .hero-actions .btn {
    flex: 1 1 auto;
    width: 100%;
  }

  .step-item,
  .path-steps-section .step-item {
    padding: 16px 16px 16px 16px;
  }

  .step-item::before,
  .path-steps .step-item::before {
    position: static;
    margin-bottom: 10px;
  }

  .step-index {
    position: static;
    margin-bottom: 10px;
  }

  .path-steps-section .step-item {
    padding-left: 16px;
  }

  .boundary-note,
  .feedback-note,
  .channels-tips,
  .example-item,
  .boundary-col,
  .related-links {
    padding: 16px;
  }

  .faq-question {
    padding: 14px 44px 14px 16px;
    font-size: 15.5px;
  }

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

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

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

/* 动效增强：滚动出现（默认可见，仅作增强） */
@media (prefers-reduced-motion: no-preference) {
  .collection-card,
  .step-item,
  .example-item {
    transition: transform 0.18s ease, border-color 0.18s ease, box-shadow 0.18s ease;
  }

  .step-item:hover,
  .example-item:hover {
    border-color: var(--line-strong);
  }
}