/* ==========================================================================
   禁漫天堂 · 全站样式表
   分组：base / layout / components / pages / responsive
   ========================================================================== */

/* --------------------------------------------------------------------------
   base · 变量与全局基础
   -------------------------------------------------------------------------- */
:root {
  --paper: #F7F3EC;
  --paper-deep: #EFE9DF;
  --ink: #2B2723;
  --ink-soft: #5C564E;
  --ochre: #8C5A2B;
  --ochre-dark: #6E4520;
  --line: #D9D2C5;
  --line-strong: #C4B9A6;
  --serif: "Songti SC", "SimSun", "Noto Serif SC", Georgia, serif;
  --sans: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  --mono: "SFMono-Regular", "Consolas", "Menlo", "Courier New", monospace;
  --radius: 6px;
  --radius-sm: 4px;
  --wrap: 1120px;
  --wrap-read: 760px;
}

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

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

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

h1,
h2,
h3,
h4 {
  margin: 0;
  font-family: var(--serif);
  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;
}

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

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

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

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

button {
  font: inherit;
  color: inherit;
}

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

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 14px 24px;
}

.brand {
  display: inline-flex;
  align-items: baseline;
  gap: 10px;
  color: var(--ink);
  text-decoration: none;
}

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

.brand-mark {
  font-family: var(--serif);
  font-size: 22px;
  font-weight: 700;
  letter-spacing: 0.02em;
}

.brand-slogan {
  font-size: 13px;
  color: var(--ink-soft);
  line-height: 1.4;
}

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

.nav-list {
  display: flex;
  align-items: center;
  gap: 6px;
}

.nav-item {
  display: block;
}

.nav-link {
  display: block;
  padding: 8px 12px;
  color: var(--ink-soft);
  font-size: 15px;
  line-height: 1.5;
  border-radius: var(--radius-sm);
  border: 1px solid transparent;
  white-space: nowrap;
}

.nav-link:hover,
.nav-link:focus-visible {
  color: var(--ochre-dark);
  border-color: var(--line);
  background-color: var(--paper-deep);
  text-decoration: none;
}

.nav-link.is-current {
  color: var(--ochre-dark);
  border-color: var(--line-strong);
  background-color: var(--paper-deep);
  font-weight: 600;
}

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 4px;
  width: 44px;
  height: 44px;
  padding: 0 10px;
  background-color: transparent;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  cursor: pointer;
}

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

.site-main {
  display: block;
}

.inner-main {
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 0 24px 64px;
}

/* 面包屑与内页标题区：全站统一 */
.breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 20px 0 0;
  font-size: 14px;
  line-height: 1.6;
  color: var(--ink-soft);
}

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

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

.page-header {
  max-width: var(--wrap-read);
  padding: 18px 0 28px;
  border-bottom: 1px solid var(--line);
  margin-bottom: 36px;
}

.page-title {
  font-size: 32px;
  font-weight: 600;
  color: var(--ink);
}

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

.site-footer {
  border-top: 1px solid var(--line);
  background-color: var(--paper-deep);
}

.footer-inner {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1.2fr;
  gap: 32px;
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 44px 24px 28px;
}

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

.footer-brand {
  font-family: var(--serif);
  font-size: 18px;
  font-weight: 700;
  color: var(--ink);
}

.footer-about {
  margin-top: 10px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--ink-soft);
}

.footer-title {
  font-family: var(--sans);
  font-size: 14px;
  font-weight: 600;
  color: var(--ink);
  letter-spacing: 0.04em;
}

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

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

.footer-list a {
  font-size: 14px;
  line-height: 1.7;
  color: var(--ink-soft);
}

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

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

.footer-copy {
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 0 24px 32px;
  font-size: 13px;
  color: var(--ink-soft);
}

/* --------------------------------------------------------------------------
   components · 通用区块、标题、链接、表格、图片
   -------------------------------------------------------------------------- */
.section {
  padding: 0 0 48px;
}

.section-title {
  font-size: 24px;
  font-weight: 600;
}

.section-desc,
.section-lead,
.section-note {
  margin-top: 10px;
  font-size: 15px;
  line-height: 1.75;
  color: var(--ink-soft);
}

.section-note a {
  color: var(--ochre);
}

.text-link {
  display: inline-block;
  font-size: 14px;
  color: var(--ochre);
  border-bottom: 1px solid var(--line-strong);
}

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

figure {
  margin: 0;
}

figure figcaption {
  margin-top: 10px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--ink-soft);
}

.content-media img,
.topic-media img,
.updates-intro-figure img,
.field-figure img,
.guide-figure img,
.hero-visual img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background-color: var(--paper-deep);
}

/* 表格通用 */
.table-scroll {
  margin-top: 20px;
  overflow-x: auto;
}

.compare-table,
.field-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
  line-height: 1.65;
}

.table-caption,
.field-table-caption {
  caption-side: top;
  padding-bottom: 10px;
  text-align: left;
  font-size: 13px;
  color: var(--ink-soft);
}

.compare-table th,
.compare-table td,
.field-table th,
.field-table td {
  padding: 10px 12px;
  border: 1px solid var(--line);
  text-align: left;
  vertical-align: top;
}

.compare-table thead th,
.field-table thead th {
  background-color: var(--paper-deep);
  font-weight: 600;
  color: var(--ink);
}

.compare-table tbody th {
  background-color: var(--paper-deep);
  font-weight: 600;
}

/* 编号与字段名统一使用等宽字体 */
.batch-code,
.batch-date,
.step-no,
.step-index,
.advice-index,
.topic-meta-key,
.field-def-meta dt {
  font-family: var(--mono);
}

/* --------------------------------------------------------------------------
   pages · 首页
   -------------------------------------------------------------------------- */
.fact-bar {
  background-color: var(--ink);
}

.fact-bar-text {
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 8px 24px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--paper);
}

.home-main {
  display: block;
}

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

.hero-inner {
  display: grid;
  grid-template-columns: 1.05fr 1fr;
  gap: 48px;
  align-items: start;
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 52px 24px 40px;
}

.hero-title {
  font-size: 32px;
  font-weight: 600;
}

.hero-lead {
  margin-top: 16px;
  font-size: 16px;
  line-height: 1.8;
  color: var(--ink-soft);
}

.hero-entry-list {
  margin-top: 26px;
  border-top: 1px solid var(--line);
}

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

.hero-entry-link {
  display: block;
  padding: 14px 0;
  color: var(--ink);
}

.hero-entry-link:hover,
.hero-entry-link:focus-visible {
  color: var(--ochre-dark);
  text-decoration: none;
}

.hero-entry-name {
  display: block;
  font-family: var(--serif);
  font-size: 17px;
  font-weight: 600;
}

.hero-entry-desc {
  display: block;
  margin-top: 4px;
  font-size: 14px;
  line-height: 1.65;
  color: var(--ink-soft);
}

.hero-visual {
  margin: 0;
}

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

.hero-visual-caption {
  margin-top: 12px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--ink-soft);
}

.content-media-primary {
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 0 24px 48px;
}

.content-media-primary img {
  aspect-ratio: 16 / 7;
}

.home-position,
.home-topics,
.home-records,
.home-guide {
  border-top: 1px solid var(--line);
}

.section-inner {
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 48px 24px;
}

.section-head {
  max-width: var(--wrap-read);
  margin-bottom: 28px;
}

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

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

.position-card-title {
  font-size: 18px;
}

.position-card-text {
  margin-top: 10px;
  font-size: 14px;
  line-height: 1.75;
  color: var(--ink-soft);
}

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

.topic-box {
  padding: 20px 18px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background-color: var(--paper);
}

.topic-box .topic-name {
  font-size: 18px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--line);
}

.topic-meta {
  margin-top: 14px;
}

.topic-meta-key {
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--ochre);
}

.topic-meta-value {
  margin: 2px 0 12px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--ink-soft);
}

.topic-meta-value:last-child {
  margin-bottom: 0;
}

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

.records-columns {
  display: grid;
  grid-template-columns: 1.1fr 1fr;
  gap: 40px;
  align-items: start;
}

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

.col-title {
  font-size: 18px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--line-strong);
}

.field-table {
  margin-top: 16px;
}

.batch-group {
  margin-top: 20px;
}

.batch-head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 12px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--line);
  font-size: 14px;
  color: var(--ink-soft);
}

.batch-code {
  font-size: 13px;
  font-weight: 700;
  color: var(--ochre);
}

.batch-name {
  font-family: var(--serif);
  font-size: 15px;
  color: var(--ink);
}

.batch-date {
  font-size: 13px;
}

.batch-list {
  margin-top: 10px;
}

.batch-item {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 16px;
  padding: 8px 0;
  border-bottom: 1px dashed var(--line);
  font-size: 14px;
}

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

.batch-item-name {
  flex: 1 1 180px;
  min-width: 0;
  color: var(--ink);
}

.batch-state,
.batch-item-status {
  font-size: 13px;
}

.batch-progress,
.batch-item-progress {
  font-family: var(--mono);
  font-size: 13px;
  color: var(--ink-soft);
}

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

.step-list {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 24px;
}

.step-item {
  display: flex;
  gap: 14px;
  align-items: flex-start;
  min-width: 0;
}

.step-no,
.step-index {
  flex: 0 0 auto;
  font-size: 14px;
  font-weight: 700;
  color: var(--ochre);
  padding-top: 2px;
}

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

.step-name,
.step-title {
  font-size: 18px;
}

.step-text,
.step-desc {
  margin-top: 8px;
  font-size: 14px;
  line-height: 1.75;
  color: var(--ink-soft);
}

.index-title {
  margin-top: 44px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--line-strong);
  font-size: 18px;
}

.column-index {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 16px;
  margin-top: 20px;
}

.index-entry {
  display: block;
  padding: 16px 14px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background-color: var(--paper);
  color: var(--ink);
}

.index-entry:hover,
.index-entry:focus-visible {
  border-color: var(--line-strong);
  color: var(--ochre-dark);
  text-decoration: none;
  transform: translateY(-2px);
}

.index-entry-name {
  display: block;
  font-family: var(--serif);
  font-size: 16px;
  font-weight: 600;
}

.index-entry-desc {
  display: block;
  margin-top: 6px;
  font-size: 13px;
  line-height: 1.65;
  color: var(--ink-soft);
}

/* --------------------------------------------------------------------------
   pages · 内页：题材分类
   -------------------------------------------------------------------------- */
.topics-detail .section-title,
.topics-compare .section-title,
.topics-advice .section-title {
  padding-bottom: 12px;
  border-bottom: 1px solid var(--line-strong);
}

.topic-block {
  display: grid;
  grid-template-columns: 1.15fr 1fr;
  gap: 40px;
  align-items: start;
  padding: 32px 0;
  border-bottom: 1px solid var(--line);
}

.topic-block:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}

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

.topic-text .topic-name {
  font-size: 20px;
}

.topic-scope,
.topic-setting,
.topic-sample,
.topic-advice {
  margin-top: 12px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink-soft);
}

.topic-sample a {
  color: var(--ochre);
}

.topic-advice {
  padding-top: 12px;
  border-top: 1px dashed var(--line);
}

.topic-media {
  margin: 0;
}

.topic-media img {
  aspect-ratio: 3 / 2;
}

.topics-compare {
  padding-top: 48px;
}

.topics-advice {
  padding-top: 8px;
}

.advice-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20px;
  margin-top: 24px;
}

.advice-item {
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background-color: var(--paper);
}

.advice-name,
.advice-title {
  font-size: 17px;
}

.advice-text {
  margin-top: 8px;
  font-size: 14px;
  line-height: 1.75;
  color: var(--ink-soft);
}

/* --------------------------------------------------------------------------
   pages · 内页：更新记录
   -------------------------------------------------------------------------- */
.updates-intro {
  padding-bottom: 48px;
}

.updates-intro-grid {
  display: grid;
  grid-template-columns: 1.1fr 1fr;
  gap: 40px;
  align-items: start;
}

.updates-intro-text {
  min-width: 0;
}

.updates-intro-text p {
  margin-top: 12px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink-soft);
}

.updates-intro-figure {
  margin: 0;
}

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

.updates-list-section {
  padding-bottom: 48px;
}

.update-batch {
  padding: 24px 0;
  border-top: 1px solid var(--line);
}

.update-batch:first-of-type {
  margin-top: 24px;
}

.batch-title {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 12px;
  font-size: 18px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--line-strong);
}

.batch-title .batch-code {
  font-size: 13px;
  font-weight: 700;
  color: var(--ochre);
}

.update-batch .batch-list {
  margin-top: 12px;
}

.update-batch .batch-item {
  display: grid;
  grid-template-columns: minmax(0, 1.6fr) minmax(0, 0.8fr) minmax(0, 0.9fr);
  gap: 12px;
  align-items: baseline;
  padding: 10px 0;
  border-bottom: 1px dashed var(--line);
  font-size: 15px;
}

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

.batch-item-name {
  color: var(--ink);
}

.batch-item-status {
  justify-self: start;
  padding: 1px 8px;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius-sm);
  color: var(--ink-soft);
}

.status-ongoing {
  color: var(--ochre-dark);
  border-color: var(--ochre);
}

.status-finished {
  color: var(--ink-soft);
}

.batch-item-progress {
  justify-self: start;
}

.updates-list-note {
  margin-top: 20px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--ink-soft);
}

.updates-standard {
  padding-bottom: 48px;
}

.standard-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 20px;
  margin-top: 24px;
}

.standard-card {
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background-color: var(--paper);
}

.standard-card-title {
  font-size: 17px;
}

.standard-card p {
  margin-top: 8px;
  font-size: 14px;
  line-height: 1.75;
  color: var(--ink-soft);
}

.updates-advice {
  padding-bottom: 48px;
}

.updates-advice .advice-list {
  grid-template-columns: repeat(3, minmax(0, 1fr));
  margin-top: 24px;
}

.updates-advice .advice-item {
  display: block;
  padding: 0;
  border: 0;
  background-color: transparent;
}

.advice-index {
  display: block;
  font-size: 13px;
  font-weight: 700;
  color: var(--ochre);
}

.updates-advice .advice-title {
  margin-top: 8px;
}

.updates-advice .advice-item p {
  margin-top: 8px;
  font-size: 14px;
  line-height: 1.75;
  color: var(--ink-soft);
}

.updates-related {
  padding-bottom: 16px;
}

.related-list {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 16px;
  margin-top: 24px;
}

.related-item {
  min-width: 0;
}

.related-item a {
  display: block;
  padding: 16px 14px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background-color: var(--paper);
  font-size: 15px;
  color: var(--ink);
}

.related-item a:hover,
.related-item a:focus-visible {
  border-color: var(--line-strong);
  color: var(--ochre-dark);
  text-decoration: none;
  transform: translateY(-2px);
}

/* --------------------------------------------------------------------------
   pages · 内页：条目字段说明
   -------------------------------------------------------------------------- */
.section-field-defs .section-title,
.section-field-figure .section-title,
.section-field-misread .section-title,
.section-field-relation .section-title {
  padding-bottom: 12px;
  border-bottom: 1px solid var(--line-strong);
}

.field-def {
  padding: 24px 0;
  border-bottom: 1px solid var(--line);
}

.field-def:last-of-type {
  border-bottom: 0;
}

.field-def-name {
  font-size: 19px;
}

.field-def-meta {
  display: grid;
  grid-template-columns: 132px minmax(0, 1fr);
  gap: 8px 20px;
  margin-top: 16px;
}

.field-def-meta dt {
  font-size: 13px;
  color: var(--ochre);
  padding-top: 2px;
}

.field-def-meta dd {
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink-soft);
  min-width: 0;
}

.field-def-meta dd.field-def-sample {
  font-family: var(--mono);
  font-size: 14px;
  color: var(--ink);
  background-color: var(--paper-deep);
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  padding: 8px 12px;
}

.section-field-figure {
  padding-top: 40px;
}

.field-figure {
  margin: 24px 0 0;
}

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

.section-field-figure .section-note {
  margin-top: 16px;
}

.section-field-misread {
  padding-top: 40px;
}

.misread-item {
  padding: 20px 0;
  border-bottom: 1px solid var(--line);
}

.misread-item:last-of-type {
  border-bottom: 0;
}

.misread-name {
  font-size: 18px;
}

.misread-point,
.misread-fix {
  margin-top: 10px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink-soft);
}

.misread-fix {
  padding-left: 14px;
  border-left: 2px solid var(--ochre);
  color: var(--ink);
}

.section-field-relation {
  padding-top: 40px;
}

.relation-list {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 20px;
  margin-top: 24px;
}

.relation-item {
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background-color: var(--paper);
}

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

.relation-desc {
  margin-top: 8px;
  font-size: 14px;
  line-height: 1.75;
  color: var(--ink-soft);
}

/* --------------------------------------------------------------------------
   pages · 内页：查阅指引
   -------------------------------------------------------------------------- */
.guide-steps .section-title,
.guide-faq .section-title,
.guide-notes .section-title,
.guide-next .section-title {
  padding-bottom: 12px;
  border-bottom: 1px solid var(--line-strong);
}

.guide-steps .step-list {
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 24px 32px;
  margin-top: 28px;
}

.guide-steps .step-item {
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background-color: var(--paper);
}

.guide-steps .step-desc a {
  color: var(--ochre);
}

.guide-figure {
  margin: 36px 0 0;
}

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

.guide-faq {
  padding-top: 44px;
}

.faq-list {
  margin-top: 24px;
  border-top: 1px solid var(--line);
}

.faq-item {
  border-bottom: 1px solid var(--line);
}

.faq-question {
  position: relative;
  padding: 16px 40px 16px 0;
  font-family: var(--serif);
  font-size: 17px;
  font-weight: 600;
  color: var(--ink);
  cursor: pointer;
  list-style: none;
}

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

.faq-question::after {
  content: "+";
  position: absolute;
  right: 6px;
  top: 50%;
  transform: translateY(-50%);
  font-family: var(--mono);
  font-size: 18px;
  color: var(--ochre);
}

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

.faq-question:hover {
  color: var(--ochre-dark);
}

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

.faq-answer p {
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink-soft);
}

.faq-answer a {
  color: var(--ochre);
}

.guide-notes {
  padding-top: 44px;
}

.note-list {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 20px;
  margin-top: 24px;
}

.note-item {
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background-color: var(--paper);
}

.note-title {
  font-size: 17px;
}

.note-desc {
  margin-top: 8px;
  font-size: 14px;
  line-height: 1.75;
  color: var(--ink-soft);
}

.guide-next {
  padding-top: 44px;
}

.next-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
  margin-top: 24px;
}

.next-item {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 16px 18px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background-color: var(--paper);
  min-width: 0;
}

.next-item a {
  font-family: var(--serif);
  font-size: 16px;
  font-weight: 600;
  color: var(--ochre);
}

.next-desc {
  font-size: 14px;
  line-height: 1.7;
  color: var(--ink-soft);
}

/* --------------------------------------------------------------------------
   pages · 404
   -------------------------------------------------------------------------- */
.error-main {
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 56px 24px 64px;
}

.error-panel {
  max-width: var(--wrap-read);
  padding-bottom: 40px;
  border-bottom: 1px solid var(--line);
}

.error-code {
  font-family: var(--mono);
  font-size: 14px;
  font-weight: 700;
  color: var(--ochre);
}

.error-title {
  margin-top: 12px;
  font-size: 32px;
}

.error-text {
  margin-top: 14px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink-soft);
}

.error-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

.btn {
  display: inline-block;
  padding: 11px 20px;
  min-height: 44px;
  font-size: 15px;
  line-height: 1.5;
  border-radius: var(--radius-sm);
  border: 1px solid transparent;
}

.btn-primary {
  background-color: var(--ochre);
  border-color: var(--ochre);
  color: var(--paper);
}

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

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

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

.error-index {
  padding-top: 40px;
}

.error-index .section-title {
  padding-bottom: 12px;
  border-bottom: 1px solid var(--line-strong);
}

.error-index-list {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px 24px;
  margin-top: 20px;
}

.error-index-list a {
  display: block;
  padding: 10px 0;
  font-size: 15px;
  color: var(--ochre);
  border-bottom: 1px dashed var(--line);
}

/* 滚动进入的轻量增强：默认完全可见，仅在支持时叠加位移过渡 */
@media (prefers-reduced-motion: no-preference) {
  .position-card,
  .topic-box,
  .index-entry,
  .standard-card,
  .related-item a,
  .note-item,
  .relation-item {
    transition: transform 0.18s ease, border-color 0.18s ease;
  }
}

/* --------------------------------------------------------------------------
   responsive · 960px 与 640px 两档断点
   -------------------------------------------------------------------------- */
@media (max-width: 960px) {
  .header-inner {
    flex-wrap: wrap;
    gap: 12px;
  }

  .nav-toggle {
    display: flex;
  }

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

  .nav-list {
    display: none;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    width: 100%;
    margin-top: 6px;
    border-top: 1px solid var(--line);
  }

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

  .nav-link {
    padding: 12px 4px;
    min-height: 44px;
    border: 0;
    border-bottom: 1px solid var(--line);
    border-radius: 0;
    font-size: 16px;
  }

  .nav-link:hover,
  .nav-link:focus-visible {
    background-color: transparent;
    border-color: var(--line);
  }

  .nav-link.is-current {
    background-color: transparent;
    border-color: var(--line);
  }

  .hero-inner {
    grid-template-columns: minmax(0, 1fr);
    gap: 32px;
    padding: 40px 24px 32px;
  }

  .position-grid,
  .topic-columns,
  .standard-grid,
  .related-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .records-columns {
    grid-template-columns: minmax(0, 1fr);
    gap: 32px;
  }

  .step-list,
  .updates-advice .advice-list,
  .relation-list,
  .note-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

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

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

  .footer-inner {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 28px;
  }
}

@media (max-width: 640px) {
  .fact-bar-text,
  .header-inner,
  .section-inner,
  .content-media-primary,
  .inner-main,
  .error-main,
  .footer-inner,
  .footer-copy {
    padding-left: 16px;
    padding-right: 16px;
  }

  .brand {
    flex-direction: column;
    gap: 2px;
  }

  .brand-slogan {
    font-size: 12px;
  }

  .page-header {
    padding: 14px 0 22px;
    margin-bottom: 28px;
  }

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

  .section-title {
    font-size: 21px;
  }

  .position-grid,
  .topic-columns,
  .standard-grid,
  .related-list,
  .step-list,
  .updates-advice .advice-list,
  .relation-list,
  .note-list,
  .advice-list,
  .next-list {
    grid-template-columns: minmax(0, 1fr);
  }

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

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

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

  .batch-item-status,
  .batch-item-progress {
    justify-self: start;
  }

  .field-def-meta {
    grid-template-columns: minmax(0, 1fr);
    gap: 4px;
  }

  .field-def-meta dd {
    margin-bottom: 10px;
  }

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

  .step-item {
    align-items: flex-start;
  }
}