/* =========================================================
   日韩午夜影院 · 全站样式
   分组：base / layout / components / pages / responsive
   ========================================================= */

/* ---------------------------------------------------------
   base · 变量与重置
   --------------------------------------------------------- */
:root {
  --canvas: #f4f4f2;
  --ink: #1c1c1a;
  --ink-soft: #4a4a46;
  --ink-mute: #6f6f6a;
  --line: #d6d6d2;
  --line-soft: #e6e6e2;
  --card: #ffffff;
  --accent: #2f4a6b;
  --accent-soft: #e8edf3;
  --radius: 6px;
  --radius-sm: 4px;
  --shell: 1140px;
  --gap: 24px;
  --font-sans: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Source Han Sans SC", "Noto Sans SC", sans-serif;
  --font-mono: "SFMono-Regular", "JetBrains Mono", "Menlo", "Consolas", "Courier New", monospace;
}

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

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

body {
  margin: 0;
  background: var(--canvas);
  color: var(--ink);
  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: 600;
  line-height: 1.35;
  color: var(--ink);
}

p {
  margin: 0;
}

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

dl, dd {
  margin: 0;
}

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

a:hover {
  color: #1d3350;
}

a:focus-visible,
button:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
  border-radius: 2px;
}

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

figure {
  margin: 0;
}

figcaption {
  font-size: 13px;
  color: var(--ink-mute);
  line-height: 1.6;
}

button {
  font-family: inherit;
  font-size: inherit;
  color: inherit;
  background: none;
  border: 0;
  cursor: pointer;
}

/* 通用文本链接 */
.text-link {
  color: var(--accent);
  font-weight: 500;
  border-bottom: 1px solid rgba(47, 74, 107, 0.28);
  padding-bottom: 1px;
}

.text-link:hover {
  color: #1d3350;
  border-bottom-color: #1d3350;
}

/* ---------------------------------------------------------
   layout · 全站骨架
   --------------------------------------------------------- */
.site-body {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  background: var(--canvas);
}

/* 顶部线索说明条 */
.top-hint {
  background: #1c1c1a;
  color: #d8d8d4;
}

.top-hint p {
  max-width: var(--shell);
  margin: 0 auto;
  padding: 9px 24px;
  font-size: 13px;
  line-height: 1.6;
}

/* 页头 */
.site-header {
  position: sticky;
  top: 0;
  z-index: 30;
  background: #ffffff;
  border-bottom: 1px solid var(--line);
}

.header-inner {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px 28px;
  max-width: var(--shell);
  margin: 0 auto;
  padding: 14px 24px;
}

.brand {
  display: flex;
  align-items: baseline;
  gap: 10px;
  color: var(--ink);
  flex: 0 0 auto;
}

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

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

.brand-sub {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--ink-mute);
}

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

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

.nav-link {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 0 14px;
  font-size: 15px;
  color: var(--ink-soft);
  border-radius: var(--radius-sm);
}

.nav-link:hover {
  color: var(--accent);
  background: var(--accent-soft);
}

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

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

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

/* 主内容 */
.site-main {
  flex: 1 0 auto;
  width: 100%;
  max-width: var(--shell);
  margin: 0 auto;
  padding: 0 24px;
}

.inner-main {
  padding-top: 22px;
  padding-bottom: 64px;
}

.home-main {
  padding-bottom: 64px;
}

/* 页脚 */
.site-footer {
  margin-top: 8px;
  background: #1c1c1a;
  color: #cfcfca;
}

.footer-inner {
  display: grid;
  grid-template-columns: minmax(230px, 1.4fr) repeat(4, minmax(0, 1fr));
  gap: 32px 28px;
  max-width: var(--shell);
  margin: 0 auto;
  padding: 48px 24px 32px;
}

.footer-brand {
  max-width: 320px;
}

.footer-name {
  font-size: 17px;
  font-weight: 600;
  color: #ffffff;
}

.footer-desc {
  margin-top: 10px;
  font-size: 13px;
  line-height: 1.75;
  color: #a9a9a4;
}

.footer-title {
  font-size: 14px;
  font-weight: 600;
  color: #ffffff;
  margin-bottom: 12px;
}

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

.footer-list a {
  display: inline-block;
  min-height: 24px;
  font-size: 13.5px;
  color: #c4c4bf;
}

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

.footer-bottom {
  border-top: 1px solid #33332f;
}

.footer-copy {
  max-width: var(--shell);
  margin: 0 auto;
  padding: 16px 24px 22px;
  font-size: 12.5px;
  color: #8f8f8a;
}

/* ---------------------------------------------------------
   components · 通用区块
   --------------------------------------------------------- */
.section {
  margin-top: 56px;
}

.section-head {
  max-width: 760px;
  margin-bottom: 22px;
}

.section-title {
  font-size: 22px;
  letter-spacing: 0;
}

.section-desc,
.section-lead,
.section-intro {
  margin-top: 8px;
  font-size: 15px;
  color: var(--ink-soft);
  line-height: 1.8;
}

.section-more {
  margin-top: 20px;
  font-size: 14.5px;
}

/* 面包屑 */
.breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  color: var(--ink-mute);
  padding: 4px 0 12px;
}

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

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

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

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

/* 页面标题区 */
.page-header {
  padding-bottom: 22px;
  border-bottom: 1px solid var(--line);
}

.page-description {
  font-family: var(--font-mono);
  font-size: 12.5px;
  color: var(--ink-mute);
  margin-bottom: 10px;
}

.page-title {
  font-size: 30px;
  line-height: 1.3;
}

.page-lead {
  margin-top: 12px;
  max-width: 780px;
  font-size: 15.5px;
  color: var(--ink-soft);
  line-height: 1.85;
}

/* 按钮 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  padding: 0 22px;
  font-size: 15px;
  font-weight: 500;
  border-radius: var(--radius);
  border: 1px solid transparent;
  transition: background 0.18s ease, border-color 0.18s ease, color 0.18s ease;
}

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

.btn-primary:hover {
  background: #24395a;
  color: #ffffff;
}

.btn-ghost {
  background: transparent;
  color: var(--accent);
  border-color: var(--accent);
}

.btn-ghost:hover {
  background: var(--accent-soft);
  color: #24395a;
}

/* 元数据标签 */
.meta-label {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--ink-mute);
  margin-right: 6px;
}

/* 图片容器统一约束 */
.hero-media img,
.collection-media img,
.basis-figure img,
.guide-figure img,
.field-figure img,
.records-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: var(--radius-sm);
  background: var(--line-soft);
}

/* ---------------------------------------------------------
   pages · 首页
   --------------------------------------------------------- */
.hero {
  padding-top: 44px;
}

.hero-layout {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(0, 1fr);
  gap: 40px;
  align-items: start;
}

.hero-copy {
  max-width: 620px;
}

.hero-kicker {
  font-family: var(--font-mono);
  font-size: 12.5px;
  color: var(--accent);
  margin-bottom: 12px;
}

.hero-title {
  font-size: 34px;
  line-height: 1.3;
}

.hero-desc {
  margin-top: 16px;
  font-size: 16px;
  color: var(--ink-soft);
  line-height: 1.85;
}

.hero-note {
  margin-top: 12px;
  font-size: 14px;
  color: var(--ink-mute);
  line-height: 1.8;
  padding-left: 14px;
  border-left: 2px solid var(--line);
}

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

.hero-media {
  margin: 0;
}

.hero-media img {
  aspect-ratio: 16 / 10;
  border: 1px solid var(--line);
}

.hero-media figcaption {
  margin-top: 10px;
}

/* 首屏缩略图索引 */
.hero-index {
  margin-top: 34px;
  padding-top: 22px;
  border-top: 1px solid var(--line);
}

.hero-index-title {
  font-size: 15px;
  font-weight: 600;
  color: var(--ink-soft);
  margin-bottom: 14px;
}

.hero-index-list {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 12px;
}

.hero-index-item a {
  display: flex;
  align-items: center;
  gap: 10px;
  min-height: 52px;
  padding: 10px 14px;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  color: var(--ink);
}

.hero-index-item a:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.index-code {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--ink-mute);
}

.index-name {
  font-size: 14.5px;
  font-weight: 500;
}

/* 频道逐行总览（首页 / 频道页共用行样式，用父级限定） */
.section-channels .channel-rows,
.section-channel-list .channel-rows {
  border-top: 1px solid var(--line);
}

.channel-row {
  display: grid;
  grid-template-columns: 72px minmax(150px, 220px) minmax(0, 1.5fr) minmax(0, 1fr);
  gap: 18px;
  align-items: baseline;
  padding: 16px 4px;
  border-bottom: 1px solid var(--line);
  transition: background 0.18s ease;
}

.channel-row:hover {
  background: #ffffff;
}

.channel-code,
.channel-no {
  font-family: var(--font-mono);
  font-size: 12.5px;
  color: var(--ink-mute);
}

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

a.channel-name:hover {
  color: var(--accent);
}

.channel-focus {
  font-size: 14.5px;
  color: var(--ink-soft);
  line-height: 1.75;
}

.channel-adjacent,
.channel-neighbor {
  font-size: 13.5px;
  color: var(--ink-mute);
  line-height: 1.7;
}

/* 专题片单卡（首页） */
.section-collections .collection-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 22px;
}

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

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

.collection-media {
  margin: 0;
}

.collection-media img {
  aspect-ratio: 16 / 9;
  border-radius: 0;
}

.collection-title,
.collection-name {
  font-size: 17px;
  padding: 16px 18px 0;
}

.collection-meta,
.collection-channels {
  padding: 8px 18px 0;
  font-size: 13px;
  color: var(--ink-mute);
}

.collection-summary {
  padding: 10px 18px 0;
  font-size: 14.5px;
  color: var(--ink-soft);
  line-height: 1.8;
}

.collection-reason {
  padding: 10px 18px 18px;
  font-size: 13.5px;
  color: var(--ink-mute);
  line-height: 1.75;
}

/* 浏览顺序四步（首页） */
.section-steps .step-list {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 20px;
}

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

.step-index {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 12.5px;
  color: var(--accent);
  margin-bottom: 10px;
}

.step-name {
  font-size: 16px;
  margin-bottom: 10px;
}

.step-confirm,
.step-detail {
  font-size: 14px;
  color: var(--ink-soft);
  line-height: 1.8;
}

.step-next {
  margin-top: 12px;
  font-size: 13.5px;
}

/* 字段与收录边界摘要（首页） */
.fields-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: 26px;
  align-items: start;
}

.fields-col {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 22px 22px 24px;
}

.col-title {
  font-size: 16px;
  margin-bottom: 14px;
}

.glossary-list dt {
  font-size: 14.5px;
  font-weight: 600;
  color: var(--ink);
}

.glossary-list dd {
  font-size: 14px;
  color: var(--ink-soft);
  line-height: 1.8;
}

.glossary-list dd + dt {
  margin-top: 14px;
  padding-top: 14px;
  border-top: 1px dashed var(--line);
}

.boundary-text {
  font-size: 14.5px;
  color: var(--ink-soft);
  line-height: 1.85;
}

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

.boundary-item {
  position: relative;
  padding-left: 18px;
  font-size: 14px;
  color: var(--ink-soft);
  line-height: 1.8;
}

.boundary-item + .boundary-item {
  margin-top: 10px;
}

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

/* 整理记录速览（首页） */
.record-groups {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 22px;
}

.record-group {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 20px 20px 22px;
}

.record-month {
  font-size: 15.5px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--line-soft);
}

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

.record-item {
  display: grid;
  grid-template-columns: 78px minmax(0, 1fr);
  gap: 4px 12px;
  padding: 10px 0;
}

.record-item + .record-item {
  border-top: 1px dashed var(--line);
}

.record-date {
  font-family: var(--font-mono);
  font-size: 12.5px;
  color: var(--ink-mute);
  grid-row: span 2;
}

.record-target {
  font-size: 14px;
  font-weight: 600;
  color: var(--ink);
}

.record-note {
  font-size: 13.5px;
  color: var(--ink-soft);
  line-height: 1.75;
}

/* 站内栏目索引 */
.sitemap-columns {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 20px;
}

.sitemap-col {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 18px 18px 20px;
}

.sitemap-name {
  font-size: 15.5px;
  margin-bottom: 10px;
}

.sitemap-desc {
  font-size: 13.5px;
  color: var(--ink-soft);
  line-height: 1.75;
}

.sitemap-note {
  margin-top: 18px;
  font-size: 14px;
  color: var(--ink-mute);
}

/* ---------------------------------------------------------
   pages · 频道分类
   --------------------------------------------------------- */
.section-basis .basis-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 20px;
}

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

.basis-name {
  font-size: 16px;
  margin-bottom: 10px;
}

.basis-text {
  font-size: 14.5px;
  color: var(--ink-soft);
  line-height: 1.8;
}

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

.basis-figure img {
  aspect-ratio: 21 / 9;
  border: 1px solid var(--line);
}

.basis-figure .figure-caption {
  margin-top: 10px;
}

.section-channel-list .channel-row {
  grid-template-columns: 72px minmax(150px, 220px) minmax(0, 1.4fr) minmax(0, 1fr);
}

.channel-list-note {
  margin-top: 18px;
  font-size: 14px;
  color: var(--ink-mute);
}

.channel-list-note a + a {
  margin-left: 14px;
}

/* 相邻频道差异说明 */
.neighbor-pairs {
  display: grid;
  gap: 18px;
}

.neighbor-pair {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20px;
  padding: 20px;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.neighbor-col {
  padding-left: 14px;
  border-left: 2px solid var(--accent-soft);
}

.neighbor-name {
  font-size: 15.5px;
  margin-bottom: 8px;
}

.neighbor-text {
  font-size: 14px;
  color: var(--ink-soft);
  line-height: 1.8;
}

/* 频道与专题的关系说明 */
.relation-body {
  max-width: 820px;
}

.relation-text {
  font-size: 15px;
  color: var(--ink-soft);
  line-height: 1.85;
}

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

.relation-links {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 20px;
}

.relation-link {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 0 18px;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  font-size: 14.5px;
}

.relation-link:hover {
  border-color: var(--accent);
}

/* ---------------------------------------------------------
   pages · 专题片单
   --------------------------------------------------------- */
.section-rules .rule-list {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 20px;
}

.rule-item {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 20px 18px 22px;
}

.rule-name {
  font-size: 15.5px;
  margin-bottom: 10px;
}

.rule-text {
  font-size: 14px;
  color: var(--ink-soft);
  line-height: 1.8;
}

.section-collections .collection-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 22px;
}

.collection-body {
  display: flex;
  flex-direction: column;
  padding-bottom: 18px;
}

/* 片单与频道分类的配合用法 */
.combine-steps {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 20px;
}

.combine-step {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 20px 20px 22px;
}

.combine-step .step-name {
  margin-bottom: 10px;
}

.combine-note {
  margin-top: 20px;
  font-size: 14px;
  color: var(--ink-mute);
}

.combine-note a + a {
  margin-left: 14px;
}

/* ---------------------------------------------------------
   pages · 浏览指引
   --------------------------------------------------------- */
.guide-steps,
.guide-prep,
.guide-pitfalls,
.guide-next {
  margin-top: 56px;
}

.guide-figure {
  margin: 22px 0 26px;
}

.guide-figure img {
  aspect-ratio: 21 / 9;
  border: 1px solid var(--line);
}

.guide-figure figcaption {
  margin-top: 10px;
}

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

.guide-steps .step-item {
  padding: 20px 18px 18px;
}

.guide-steps .step-index {
  display: block;
  font-family: var(--font-mono);
  font-size: 12.5px;
  color: var(--accent);
  margin-bottom: 10px;
}

.guide-steps .step-name {
  font-size: 16px;
  margin-bottom: 10px;
}

.guide-steps .step-detail {
  font-size: 14px;
  color: var(--ink-soft);
  line-height: 1.8;
}

.guide-steps .step-next {
  margin-top: 12px;
  font-size: 13.5px;
  color: var(--ink-mute);
}

/* 浏览前准备要点 */
.prep-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px 24px;
}

.prep-item {
  padding: 18px 20px;
  background: var(--card);
  border: 1px solid var(--line);
  border-left: 3px solid var(--accent);
  border-radius: var(--radius);
}

.prep-name {
  font-size: 15.5px;
  margin-bottom: 8px;
}

.prep-text {
  font-size: 14px;
  color: var(--ink-soft);
  line-height: 1.8;
}

/* 常见查找误区对照 */
.pitfall-table {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--card);
}

.pitfall-head {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  background: #ececea;
  border-bottom: 1px solid var(--line);
}

.pitfall-col-title {
  padding: 12px 20px;
  font-size: 13.5px;
  font-weight: 600;
  color: var(--ink-soft);
}

.pitfall-col-title + .pitfall-col-title {
  border-left: 1px solid var(--line);
}

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

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

.pitfall-wrong,
.pitfall-right {
  padding: 16px 20px;
  font-size: 14px;
  line-height: 1.8;
}

.pitfall-wrong {
  color: var(--ink-mute);
}

.pitfall-right {
  color: var(--ink-soft);
  border-left: 1px solid var(--line-soft);
  background: #fbfbfa;
}

/* 下一步入口 */
.next-links {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 18px;
}

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

.next-link-item a {
  display: inline-block;
  min-height: 44px;
  font-size: 15.5px;
  font-weight: 600;
}

.next-link-desc {
  margin-top: 8px;
  font-size: 13.5px;
  color: var(--ink-soft);
  line-height: 1.75;
}

/* ---------------------------------------------------------
   pages · 字段说明
   --------------------------------------------------------- */
.field-figure {
  margin: 0 0 26px;
}

.field-figure img {
  aspect-ratio: 21 / 9;
  border: 1px solid var(--line);
}

.field-figure-caption {
  margin-top: 10px;
}

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

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

.field-name {
  font-size: 15.5px;
  margin-bottom: 8px;
  padding-bottom: 8px;
  border-bottom: 1px dashed var(--line);
}

.field-text {
  font-size: 14px;
  color: var(--ink-soft);
  line-height: 1.8;
}

/* 收录边界两栏 */
.boundary-columns {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 22px;
  align-items: start;
}

.boundary-col {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 20px 22px 22px;
}

.boundary-col-in {
  border-top: 3px solid var(--accent);
}

.boundary-col-out {
  border-top: 3px solid var(--line);
}

.boundary-heading {
  font-size: 16px;
  margin-bottom: 14px;
}

.boundary-col .boundary-item {
  font-size: 14px;
}

.boundary-note {
  margin-top: 18px;
  font-size: 14px;
  color: var(--ink-mute);
  line-height: 1.8;
}

/* 字段变更对照 */
.history-steps {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 20px;
}

.history-step {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 20px 20px 22px;
}

.history-step .step-name {
  font-size: 15.5px;
  margin-bottom: 10px;
}

.history-step .step-text {
  font-size: 14px;
  color: var(--ink-soft);
  line-height: 1.8;
}

.field-history-note {
  margin-top: 18px;
  font-size: 14px;
  color: var(--ink-mute);
}

/* ---------------------------------------------------------
   pages · 整理记录
   --------------------------------------------------------- */
.records-intro,
.records-archive,
.records-crossref {
  margin-top: 56px;
}

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

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

.intro-card-title {
  font-size: 15.5px;
  margin-bottom: 10px;
}

.intro-card-text {
  font-size: 14px;
  color: var(--ink-soft);
  line-height: 1.8;
}

.records-groups {
  display: grid;
  gap: 22px;
}

.records-group {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}

.records-group-title {
  margin: 0;
}

.records-toggle {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  width: 100%;
  min-height: 56px;
  padding: 14px 20px;
  text-align: left;
  background: #fbfbfa;
  border-bottom: 1px solid var(--line);
}

.records-toggle:hover {
  background: var(--accent-soft);
}

.records-month {
  font-size: 16px;
  font-weight: 600;
  color: var(--ink);
}

.records-count {
  font-family: var(--font-mono);
  font-size: 12.5px;
  color: var(--ink-mute);
}

.records-group-body {
  display: grid;
  grid-template-columns: minmax(0, 260px) minmax(0, 1fr);
  gap: 24px;
  padding: 20px;
}

.records-group-body[hidden] {
  display: none;
}

.records-thumb {
  margin: 0;
}

.records-thumb img {
  aspect-ratio: 4 / 3;
  border: 1px solid var(--line);
}

.records-thumb-caption {
  margin-top: 10px;
}

.records-list {
  border-top: 1px solid var(--line-soft);
}

.records-item {
  display: grid;
  grid-template-columns: 96px minmax(140px, 200px) minmax(0, 1fr);
  gap: 6px 16px;
  padding: 14px 0;
  border-bottom: 1px solid var(--line-soft);
}

.records-date {
  font-family: var(--font-mono);
  font-size: 12.5px;
  color: var(--ink-mute);
}

.records-target {
  font-size: 14.5px;
  font-weight: 600;
  color: var(--ink);
}

.records-note {
  font-size: 14px;
  color: var(--ink-soft);
  line-height: 1.8;
}

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

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

.crossref-card-title {
  font-size: 15.5px;
  margin-bottom: 10px;
}

.crossref-card-text {
  font-size: 14px;
  color: var(--ink-soft);
  line-height: 1.8;
}

/* ---------------------------------------------------------
   pages · 404
   --------------------------------------------------------- */
.site-error .site-main {
  display: block;
}

.error-main {
  padding-top: 64px;
  padding-bottom: 72px;
}

.error-block {
  max-width: 640px;
}

.error-code {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--accent);
  margin-bottom: 12px;
}

.error-title {
  font-size: 30px;
  line-height: 1.3;
}

.error-desc {
  margin-top: 14px;
  font-size: 15.5px;
  color: var(--ink-soft);
  line-height: 1.85;
}

.error-block .btn {
  margin-top: 24px;
}

.error-links {
  margin-top: 48px;
  padding-top: 26px;
  border-top: 1px solid var(--line);
}

.error-link-list {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 14px;
  margin-top: 18px;
}

.error-link-list a {
  display: flex;
  align-items: center;
  min-height: 48px;
  padding: 0 16px;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  font-size: 14.5px;
  color: var(--ink);
}

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

/* ---------------------------------------------------------
   responsive · 断点
   --------------------------------------------------------- */
@media (max-width: 1024px) {
  .hero-title {
    font-size: 30px;
  }

  .page-title {
    font-size: 27px;
  }

  .hero-layout {
    grid-template-columns: minmax(0, 1fr);
    gap: 28px;
  }

  .hero-copy {
    max-width: none;
  }

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

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

  .footer-brand {
    grid-column: 1 / -1;
    max-width: none;
  }

  .sitemap-columns {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

  .record-groups,
  .basis-grid,
  .combine-steps,
  .history-steps,
  .records-intro-grid,
  .records-crossref-grid,
  .error-link-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

  .records-thumb {
    max-width: 320px;
  }
}

@media (max-width: 860px) {
  .header-inner {
    padding: 12px 20px;
    gap: 10px;
  }

  .nav-toggle {
    display: flex;
  }

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

  .nav-list {
    display: none;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 6px 0 10px;
    border-top: 1px solid var(--line);
  }

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

  .nav-link {
    min-height: 48px;
    padding: 0 6px;
    font-size: 15.5px;
    border-radius: 0;
  }

  .nav-link.is-current {
    box-shadow: inset 3px 0 0 var(--accent);
    border-radius: 0;
    padding-left: 12px;
  }

  .site-main {
    padding: 0 20px;
  }

  .inner-main {
    padding-top: 18px;
    padding-bottom: 52px;
  }

  .hero {
    padding-top: 30px;
  }

  .section,
  .guide-steps,
  .guide-prep,
  .guide-pitfalls,
  .guide-next,
  .records-intro,
  .records-archive,
  .records-crossref {
    margin-top: 42px;
  }

  /* 频道行改为堆叠条目 */
  .channel-row {
    grid-template-columns: minmax(0, 1fr);
    gap: 6px;
    padding: 16px 2px;
  }

  .channel-row .channel-code,
  .channel-row .channel-no {
    order: -1;
  }

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

  .fields-layout,
  .boundary-columns,
  .neighbor-pair,
  .prep-list,
  .field-list,
  .section-collections .collection-grid {
    grid-template-columns: minmax(0, 1fr);
  }

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

  .pitfall-col-title + .pitfall-col-title,
  .pitfall-right {
    border-left: 0;
  }

  .pitfall-col-title + .pitfall-col-title {
    border-top: 1px solid var(--line);
  }

  .pitfall-right {
    border-top: 1px dashed var(--line-soft);
  }

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

  .records-group-body {
    padding: 18px 16px;
  }

  .footer-inner {
    padding: 40px 20px 26px;
    gap: 26px 20px;
  }

  .footer-copy {
    padding: 16px 20px 22px;
  }
}

@media (max-width: 560px) {
  body {
    font-size: 15.5px;
  }

  .top-hint p {
    padding: 9px 20px;
    font-size: 12.5px;
  }

  .brand-mark {
    font-size: 17.5px;
  }

  .brand-sub {
    font-size: 11.5px;
  }

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

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

  .hero-index-list,
  .section-steps .step-list,
  .guide-steps .step-list,
  .section-rules .rule-list,
  .next-links,
  .record-groups,
  .basis-grid,
  .combine-steps,
  .history-steps,
  .records-intro-grid,
  .records-crossref-grid,
  .sitemap-columns,
  .error-link-list {
    grid-template-columns: minmax(0, 1fr);
  }

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

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

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

  .record-date {
    grid-row: auto;
  }

  .channel-list-note a + a,
  .combine-note a + a {
    display: inline-block;
    margin-left: 0;
    margin-top: 8px;
  }
}

/* 尊重减少动效偏好 */
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
  }

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