/* ==========================================================================
   欧美影院 · 全站样式
   分组：base / layout / components / pages / responsive
   ========================================================================== */

/* --------------------------------------------------------------------------
   1. base
   -------------------------------------------------------------------------- */

:root {
  --ink: #17222e;
  --ink-soft: #2c3a48;
  --paper: #f5f1e8;
  --paper-white: #fffdf8;
  --copper: #b4693a;
  --copper-deep: #96522a;
  --teal: #2f6b64;
  --line: #dcd3c4;
  --muted: #5a6470;
  --serif: "Noto Serif SC", "Source Han Serif SC", "Songti SC", "SimSun", serif;
  --sans: -apple-system, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  --mono: ui-monospace, "SFMono-Regular", Menlo, Consolas, "Courier New", monospace;
  --wrap: 1180px;
  --radius: 6px;
}

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

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

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;
}

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

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

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

p {
  margin: 0 0 1em;
}

h1,
h2,
h3,
h4 {
  font-family: var(--serif);
  font-weight: 600;
  color: var(--ink);
  line-height: 1.35;
  margin: 0 0 0.6em;
}

ul,
ol {
  margin: 0 0 1em;
  padding-left: 1.2em;
}

li {
  margin-bottom: 0.35em;
}

figure {
  margin: 0;
}

figcaption {
  font-size: 0.82rem;
  color: var(--muted);
  line-height: 1.6;
  margin-top: 0.5em;
}

button {
  font-family: inherit;
  cursor: pointer;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

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

/* --------------------------------------------------------------------------
   2. layout —— 全站骨架
   -------------------------------------------------------------------------- */

/* 页头 */
.site-header {
  position: relative;
  background-color: var(--paper-white);
  border-bottom: 1px solid var(--line);
}

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

.brand {
  display: flex;
  flex-direction: column;
  gap: 2px;
  flex: 0 0 auto;
}

.brand-name {
  font-family: var(--serif);
  font-size: 1.32rem;
  font-weight: 600;
  color: var(--ink);
  letter-spacing: 0.02em;
}

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

.brand-slogan {
  font-size: 0.72rem;
  color: var(--muted);
  letter-spacing: 0.02em;
}

/* 主导航 */
.site-nav {
  flex: 1 1 auto;
  min-width: 0;
}

.primary-nav ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 4px 18px;
}

.primary-nav li {
  margin: 0;
}

.primary-nav a {
  display: inline-block;
  padding: 6px 2px;
  font-size: 0.94rem;
  color: var(--ink-soft);
  border-bottom: 2px solid transparent;
}

.primary-nav a:hover {
  color: var(--copper);
  border-bottom-color: var(--copper);
}

.primary-nav a.is-current {
  color: var(--ink);
  font-weight: 600;
  border-bottom-color: var(--copper);
}

/* 汉堡按钮 */
.nav-toggle {
  display: none;
  width: 44px;
  height: 44px;
  padding: 0;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background-color: var(--paper-white);
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
}

.nav-toggle-bar {
  display: block;
  width: 20px;
  height: 2px;
  background-color: var(--ink);
  border-radius: 1px;
}

/* 主题索引标签带 */
.topic-strip {
  background-color: var(--ink);
  border-bottom: 1px solid var(--ink);
}

.topic-strip ul {
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 0 24px;
  list-style: none;
  display: flex;
  gap: 2px;
  overflow-x: auto;
  scrollbar-width: thin;
}

.topic-strip li {
  margin: 0;
  flex: 0 0 auto;
}

.topic-strip a {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 9px 12px;
  font-size: 0.82rem;
  color: #d8d2c6;
  white-space: nowrap;
  border-bottom: 2px solid transparent;
}

.topic-strip a:hover {
  color: #fff;
  border-bottom-color: var(--copper);
}

.topic-no {
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.06em;
  color: var(--copper);
}

/* 主内容容器 */
.site-main {
  display: block;
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 0 24px;
}

.home-main {
  padding-top: 0;
}

.inner-main {
  padding-top: 22px;
  padding-bottom: 56px;
}

/* 面包屑 */
.breadcrumb {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  font-size: 0.82rem;
  color: var(--muted);
  margin-bottom: 20px;
}

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

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

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

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

/* 页标题区 */
.page-header {
  margin-bottom: 10px;
}

.page-title {
  font-family: var(--serif);
  font-size: clamp(1.6rem, 3.4vw, 2.1rem);
  font-weight: 600;
  color: var(--ink);
  line-height: 1.32;
  margin: 0;
}

/* 页脚 */
.site-footer {
  background-color: var(--ink);
  color: #cfc9bd;
  margin-top: 40px;
}

.footer-inner {
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 44px 24px 26px;
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1fr;
  gap: 32px 36px;
}

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

.footer-name {
  font-family: var(--serif);
  font-size: 1.16rem;
  color: #fff;
  margin: 0 0 8px;
}

.footer-intro {
  font-size: 0.84rem;
  line-height: 1.7;
  color: #a8a196;
  margin: 0;
}

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

.footer-col h2 {
  font-family: var(--sans);
  font-size: 0.82rem;
  font-weight: 600;
  color: #e8e2d6;
  letter-spacing: 0.04em;
  margin: 0 0 12px;
  padding-bottom: 8px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.12);
}

.footer-col ul {
  list-style: none;
  margin: 0;
  padding: 0;
}

.footer-col li {
  margin: 0 0 8px;
}

.footer-col a {
  font-size: 0.84rem;
  color: #b7b0a4;
}

.footer-col a:hover {
  color: #fff;
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.12);
}

.footer-bottom p {
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 4px 24px;
  font-size: 0.78rem;
  color: #928b80;
  line-height: 1.7;
}

.footer-bottom p:first-child {
  padding-top: 16px;
}

.footer-bottom p:last-child {
  padding-bottom: 18px;
}

/* 内页通用分节 */
.section-head {
  margin-bottom: 20px;
}

.section-head h2 {
  font-size: 1.34rem;
  margin: 0 0 6px;
}

.section-head p {
  font-size: 0.9rem;
  color: var(--muted);
  margin: 0;
}

.section-title {
  font-size: 1.34rem;
  margin: 0 0 14px;
}

.section-lead {
  font-size: 0.9rem;
  color: var(--muted);
  margin: 0 0 18px;
}

.section-note {
  font-size: 0.9rem;
  color: var(--muted);
  margin: 0 0 18px;
}

/* 内页页头信息块 */
.page-head,
.page-title-block {
  margin-bottom: 22px;
}

.page-no {
  font-family: var(--mono);
  font-size: 0.76rem;
  letter-spacing: 0.06em;
  color: var(--copper);
  margin: 0 0 6px;
}

.page-lead {
  font-size: 0.98rem;
  color: var(--ink-soft);
  line-height: 1.8;
  margin: 0;
  max-width: 760px;
}

.page-kicker {
  margin: 0 0 6px;
}

/* --------------------------------------------------------------------------
   3. components —— 通用组件
   -------------------------------------------------------------------------- */

/* 按钮 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0 20px;
  font-size: 0.92rem;
  border-radius: var(--radius);
  border: 1px solid transparent;
  transition: background-color 0.18s ease, color 0.18s ease, border-color 0.18s ease;
}

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

.btn-primary:hover,
a.btn-primary:hover {
  background-color: var(--copper);
  border-color: var(--copper);
  color: #fff;
}

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

.btn-ghost:hover,
a.btn-ghost:hover {
  border-color: var(--copper);
  color: var(--copper);
}

.btn-outline,
a.btn-outline {
  background-color: transparent;
  color: var(--copper);
  border-color: var(--copper);
}

.btn-outline:hover,
a.btn-outline:hover {
  background-color: var(--copper);
  color: #fff;
}

/* 结论摘要块（左侧竖线引文） */
.summary-block,
.conclusion,
.conclusion-block,
.verdict-block {
  background-color: var(--paper-white);
  border: 1px solid var(--line);
  border-left: 3px solid var(--copper);
  border-radius: 0 var(--radius) var(--radius) 0;
  padding: 18px 22px;
  margin-bottom: 28px;
}

.summary-title,
.verdict-block h2 {
  font-size: 1rem;
  margin: 0 0 8px;
  color: var(--ink);
}

.summary-quote,
.summary-text,
.verdict-quote,
.conclusion > p:first-child,
.conclusion-quote p:first-child {
  font-family: var(--serif);
  font-size: 1.02rem;
  line-height: 1.7;
  color: var(--ink);
  margin: 0 0 8px;
}

.summary-note,
.verdict-note,
.conclusion-note,
.conclusion-quote .conclusion-note {
  font-size: 0.86rem;
  color: var(--muted);
  margin: 0;
}

.conclusion-quote {
  margin: 0;
  padding: 0;
  border: 0;
}

/* 折叠问答 */
.faq-item {
  background-color: var(--paper-white);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 0 18px;
  margin-bottom: 10px;
}

.faq-item summary {
  list-style: none;
  cursor: pointer;
  padding: 14px 26px 14px 0;
  font-family: var(--serif);
  font-size: 0.98rem;
  font-weight: 600;
  color: var(--ink);
  position: relative;
}

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

.faq-item summary::after {
  content: "+";
  position: absolute;
  right: 0;
  top: 50%;
  transform: translateY(-50%);
  font-family: var(--mono);
  font-size: 1.1rem;
  color: var(--copper);
}

.faq-item[open] summary::after {
  content: "\2212";
}

.faq-item summary:hover {
  color: var(--copper);
}

.faq-item p {
  font-size: 0.9rem;
  color: var(--ink-soft);
  line-height: 1.8;
  margin: 0 0 14px;
  padding-right: 10px;
}

/* 相关分类标签组 */
.related-tags,
.related-list,
.related-grid,
.related-links {
  list-style: none;
  margin: 0 0 24px;
  padding: 0;
}

.related-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.related-tags li {
  margin: 0;
}

.related-tags a {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 0 16px;
  font-size: 0.88rem;
  color: var(--teal);
  background-color: var(--paper-white);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.related-tags a:hover {
  color: var(--copper);
  border-color: var(--copper);
}

/* 相关分类卡片 */
.related-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 14px;
}

.related-grid li {
  margin: 0;
}

.related-card {
  display: flex;
  flex-direction: column;
  gap: 4px;
  min-height: 44px;
  padding: 14px 16px;
  background-color: var(--paper-white);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.related-card:hover {
  border-color: var(--copper);
}

.related-name {
  font-family: var(--serif);
  font-size: 0.96rem;
  font-weight: 600;
  color: var(--ink);
}

.related-desc {
  font-size: 0.8rem;
  color: var(--muted);
  line-height: 1.55;
}

/* 归档入口（三列） */
.archive {
  margin-bottom: 32px;
}

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

.archive-col h3 {
  font-size: 0.94rem;
  margin: 0 0 10px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--line);
}

.archive-col ul {
  list-style: none;
  margin: 0;
  padding: 0;
}

.archive-col li {
  margin: 0 0 6px;
}

.archive-col a {
  font-size: 0.86rem;
  color: var(--ink-soft);
  display: inline-block;
  padding: 4px 0;
}

.archive-col a:hover {
  color: var(--copper);
}

/* 对照清单（左右两列） */
.compare-columns,
.contrast-columns {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20px;
  margin-bottom: 16px;
}

.compare-col,
.contrast-col {
  background-color: var(--paper-white);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 18px 20px;
}

.compare-col h3,
.contrast-col h3 {
  font-size: 0.98rem;
  margin: 0 0 12px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--line);
}

.compare-ok h3,
.contrast-safe h3 {
  color: var(--teal);
}

.compare-warn h3,
.contrast-caution h3 {
  color: var(--copper-deep);
}

.compare-col ul,
.contrast-col ul {
  list-style: none;
  margin: 0;
  padding: 0;
}

.compare-col li,
.contrast-col li {
  position: relative;
  padding-left: 18px;
  font-size: 0.88rem;
  line-height: 1.7;
  color: var(--ink-soft);
  margin-bottom: 10px;
}

.compare-col li:last-child,
.contrast-col li:last-child {
  margin-bottom: 0;
}

.compare-ok li::before,
.contrast-safe li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.62em;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: var(--teal);
}

.compare-warn li::before,
.contrast-caution li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.62em;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: var(--copper);
}

.compare-foot,
.prep-foot,
.ledger-foot,
.rail-foot {
  font-size: 0.88rem;
  margin: 0;
}

.compare-foot a,
.prep-foot a,
.ledger-foot a,
.rail-foot a {
  color: var(--copper);
  border-bottom: 1px solid transparent;
}

.compare-foot a:hover,
.prep-foot a:hover,
.ledger-foot a:hover,
.rail-foot a:hover {
  border-bottom-color: var(--copper);
}

/* 阅读进度条 */
.reading-progress,
.read-progress,
.progress-bar {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background-color: transparent;
  z-index: 60;
  pointer-events: none;
}

.reading-progress-bar,
.read-progress-bar {
  display: block;
  height: 100%;
  width: 0;
  background-color: var(--copper);
}

/* --------------------------------------------------------------------------
   4. pages
   -------------------------------------------------------------------------- */

/* ===== 首页 ===== */

/* 首屏 */
.hero {
  display: grid;
  grid-template-columns: 5fr 7fr;
  grid-template-areas:
    "copy figure"
    "copy panel";
  gap: 24px 40px;
  padding: 44px 0 40px;
  border-bottom: 1px solid var(--line);
}

.hero-copy {
  grid-area: copy;
  align-self: start;
}

.hero-copy .eyebrow {
  font-family: var(--mono);
  font-size: 0.76rem;
  letter-spacing: 0.06em;
  color: var(--copper);
  margin: 0 0 12px;
}

.hero-copy h1 {
  font-size: clamp(1.7rem, 3.6vw, 2.32rem);
  line-height: 1.3;
  margin: 0 0 16px;
}

.hero-lead {
  font-size: 0.98rem;
  line-height: 1.85;
  color: var(--ink-soft);
  margin: 0 0 22px;
}

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

.hero-tags {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.hero-tags li {
  margin: 0;
  font-size: 0.78rem;
  color: var(--muted);
  padding: 4px 10px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background-color: var(--paper-white);
}

.hero-figure {
  grid-area: figure;
  overflow: hidden;
  border-radius: var(--radius);
  border: 1px solid var(--line);
  background-color: var(--paper-white);
}

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

.hero-figure figcaption {
  padding: 8px 14px;
  margin: 0;
  font-size: 0.8rem;
}

/* 任务面板 2×2 */
.task-panel {
  grid-area: panel;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.task-cell {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 16px 16px 14px;
  background-color: var(--paper-white);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  min-height: 44px;
  position: relative;
}

.task-cell:hover {
  border-color: var(--copper);
}

.task-no {
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.06em;
  color: var(--copper);
}

.task-name {
  font-family: var(--serif);
  font-size: 1rem;
  font-weight: 600;
  color: var(--ink);
}

.task-desc {
  font-size: 0.82rem;
  color: var(--muted);
  line-height: 1.6;
}

.task-arrow {
  position: absolute;
  right: 14px;
  top: 14px;
  font-family: var(--mono);
  font-size: 0.9rem;
  color: var(--copper);
  opacity: 0.7;
}

/* 编排说明带 */
.editorial-note {
  display: grid;
  grid-template-columns: 1.1fr 1fr;
  gap: 28px 40px;
  padding: 32px 0;
  border-bottom: 1px solid var(--line);
}

.note-copy h2 {
  font-size: 1.24rem;
  margin: 0 0 10px;
}

.note-copy p {
  font-size: 0.94rem;
  line-height: 1.85;
  color: var(--ink-soft);
  margin: 0;
}

.note-principles {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
}

.note-principles li {
  margin: 0;
  padding: 12px 0;
  border-top: 1px solid var(--line);
  font-size: 0.9rem;
  color: var(--ink-soft);
  line-height: 1.7;
}

.note-principles li:first-child {
  border-top: 0;
  padding-top: 0;
}

.note-principles strong {
  display: block;
  font-family: var(--serif);
  font-size: 0.96rem;
  color: var(--ink);
  margin-bottom: 2px;
}

/* 频道目录 + 专题辑侧栏 */
.home-directory {
  display: grid;
  grid-template-columns: 8fr 4fr;
  gap: 32px;
  padding: 36px 0;
  border-bottom: 1px solid var(--line);
}

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

.ledger-list {
  list-style: none;
  margin: 0 0 12px;
  padding: 0;
  border-top: 1px solid var(--line);
}

.ledger-row {
  display: grid;
  grid-template-columns: 40px minmax(120px, 1fr) minmax(0, 2fr) auto;
  align-items: baseline;
  gap: 6px 14px;
  padding: 12px 4px;
  margin: 0;
  border-bottom: 1px solid var(--line);
}

.ledger-no {
  font-family: var(--mono);
  font-size: 0.8rem;
  letter-spacing: 0.06em;
  color: var(--copper);
}

.ledger-name {
  font-family: var(--serif);
  font-size: 1rem;
  font-weight: 600;
  color: var(--ink);
}

.ledger-desc {
  font-size: 0.86rem;
  color: var(--muted);
  margin: 0;
  line-height: 1.7;
}

.ledger-tag {
  font-size: 0.74rem;
  color: var(--teal);
  padding: 2px 8px;
  border: 1px solid var(--line);
  border-radius: 999px;
  white-space: nowrap;
}

.ledger-row:hover .ledger-name {
  color: var(--copper);
}

/* 专题辑侧栏 */
.series-rail {
  min-width: 0;
  background-color: var(--paper-white);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 20px;
}

.series-rail h2 {
  font-size: 1.06rem;
  margin: 0 0 6px;
}

.rail-lead {
  font-size: 0.84rem;
  color: var(--muted);
  margin: 0 0 16px;
  line-height: 1.7;
}

.series-card {
  margin-bottom: 16px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--line);
}

.series-card:last-of-type {
  border-bottom: 0;
}

.series-cover {
  overflow: hidden;
  border-radius: var(--radius);
  border: 1px solid var(--line);
  margin-bottom: 8px;
  background-color: var(--paper);
}

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

.series-no {
  font-family: var(--mono);
  font-size: 0.74rem;
  letter-spacing: 0.06em;
  color: var(--copper);
  margin: 0 0 2px;
}

.series-card h3 {
  font-size: 0.98rem;
  margin: 0 0 4px;
}

.series-card h3 a:hover {
  color: var(--copper);
}

.series-card > p:last-child {
  font-size: 0.82rem;
  color: var(--muted);
  line-height: 1.65;
  margin: 0;
}

/* 观看前三步任务带 */
.prep-band {
  padding: 36px 0;
  border-bottom: 1px solid var(--line);
}

.prep-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
  margin-bottom: 22px;
}

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

.prep-step .step-no {
  font-family: var(--mono);
  font-size: 0.76rem;
  letter-spacing: 0.06em;
  color: var(--copper);
  margin: 0 0 4px;
}

.prep-step h3 {
  font-size: 1rem;
  margin: 0 0 8px;
}

.prep-step > p {
  font-size: 0.88rem;
  color: var(--ink-soft);
  line-height: 1.75;
  margin: 0 0 10px;
}

.prep-step .step-done {
  font-size: 0.82rem;
  color: var(--teal);
  margin: 0;
  padding-top: 10px;
  border-top: 1px dashed var(--line);
  line-height: 1.65;
}

.prep-figure {
  overflow: hidden;
  border-radius: var(--radius);
  border: 1px solid var(--line);
  background-color: var(--paper-white);
  margin-bottom: 14px;
}

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

.prep-figure figcaption {
  padding: 8px 14px;
  margin: 0;
}

/* 入口核验对照 */
.check-compare {
  padding: 36px 0;
  border-bottom: 1px solid var(--line);
}

/* 首页常见问题 */
.home-faq {
  padding: 36px 0;
  border-bottom: 1px solid var(--line);
}

/* 反馈准备提示条 */
.feedback-cue {
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: center;
  gap: 20px 28px;
  margin: 32px 0;
  padding: 22px 26px;
  background-color: var(--paper-white);
  border: 1px solid var(--line);
  border-left: 3px solid var(--copper);
  border-radius: 0 var(--radius) var(--radius) 0;
}

.cue-copy h2 {
  font-size: 1.06rem;
  margin: 0 0 6px;
}

.cue-copy p {
  font-size: 0.9rem;
  color: var(--ink-soft);
  line-height: 1.75;
  margin: 0;
}

/* 首页底部相关链接 */
.related-links {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 16px;
  padding: 0 0 8px;
  margin: 0 0 8px;
}

.related-links-label {
  font-family: var(--mono);
  font-size: 0.76rem;
  letter-spacing: 0.06em;
  color: var(--muted);
}

.related-links-item {
  font-size: 0.88rem;
  color: var(--teal);
  padding: 6px 0;
  border-bottom: 1px solid transparent;
}

.related-links-item:hover {
  color: var(--copper);
  border-bottom-color: var(--copper);
}

/* ===== 频道索引 ===== */

/* 侧栏在前的两栏布局 */
.page-layout {
  display: grid;
  grid-template-columns: 760px minmax(0, 340px);
  gap: 32px;
  align-items: start;
  margin-bottom: 36px;
}

.sidebar-left .page-layout {
  grid-template-columns: minmax(0, 260px) minmax(0, 1fr);
}

.topic-aside {
  min-width: 0;
  background-color: var(--paper-white);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 18px 18px 14px;
}

.aside-title {
  font-size: 1rem;
  margin: 0 0 6px;
}

.aside-intro {
  font-size: 0.82rem;
  color: var(--muted);
  line-height: 1.65;
  margin: 0 0 12px;
}

.topic-anchor-list {
  list-style: none;
  margin: 0;
  padding: 0;
  counter-reset: none;
}

.topic-anchor-list li {
  margin: 0;
  border-top: 1px solid var(--line);
}

.topic-anchor-list li:first-child {
  border-top: 0;
}

.topic-anchor-list a {
  display: flex;
  align-items: center;
  gap: 8px;
  min-height: 44px;
  padding: 4px 0;
  font-size: 0.88rem;
  color: var(--ink-soft);
}

.topic-anchor-list a:hover {
  color: var(--copper);
}

/* 分组目录 */
.group-catalog {
  min-width: 0;
}

.catalog-figure {
  overflow: hidden;
  border-radius: var(--radius);
  border: 1px solid var(--line);
  background-color: var(--paper-white);
  margin-bottom: 24px;
}

.catalog-figure img {
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 8;
  object-fit: cover;
}

.catalog-figure figcaption {
  padding: 8px 14px;
  margin: 0;
}

.channel-group {
  padding: 20px 0;
  border-top: 1px solid var(--line);
}

.channel-group:first-of-type {
  border-top: 0;
  padding-top: 0;
}

.group-head {
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 8px 12px;
  margin-bottom: 8px;
}

.group-no {
  font-family: var(--mono);
  font-size: 0.8rem;
  letter-spacing: 0.06em;
  color: var(--copper);
}

.group-head h2 {
  font-size: 1.14rem;
  margin: 0;
}

.group-tag {
  font-size: 0.74rem;
  color: var(--teal);
  padding: 2px 8px;
  border: 1px solid var(--line);
  border-radius: 999px;
}

.group-desc {
  font-size: 0.9rem;
  color: var(--ink-soft);
  line-height: 1.8;
  margin: 0 0 12px;
}

.entry-list {
  list-style: none;
  margin: 0 0 12px;
  padding: 0;
}

.entry-list li {
  display: grid;
  grid-template-columns: minmax(120px, 200px) minmax(0, 1fr);
  gap: 4px 16px;
  padding: 8px 0;
  margin: 0;
  border-bottom: 1px dashed var(--line);
}

.entry-list li:last-child {
  border-bottom: 0;
}

.entry-name {
  font-family: var(--serif);
  font-size: 0.92rem;
  font-weight: 600;
  color: var(--ink);
}

.entry-note {
  font-size: 0.84rem;
  color: var(--muted);
  line-height: 1.7;
}

.group-link {
  font-size: 0.86rem;
  margin: 0;
}

.group-link a {
  color: var(--copper);
}

.group-link a:hover {
  border-bottom: 1px solid var(--copper);
}

/* 相关分类（频道索引） */
.related-block,
.related-section,
.related-cats,
.related-topics {
  margin-bottom: 32px;
}

.related-block .section-head {
  margin-bottom: 14px;
}

.related-note {
  font-size: 0.82rem;
  color: var(--muted);
  margin: 8px 0 0;
}

.archive-block {
  margin-bottom: 36px;
}

/* ===== 专题辑 ===== */

.series-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 22px;
  margin-bottom: 36px;
}

.series-grid .series-card {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  background-color: var(--paper-white);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 0;
  margin: 0;
  overflow: hidden;
}

.series-grid .series-cover {
  margin: 0;
  border: 0;
  border-radius: 0;
  border-bottom: 1px solid var(--line);
}

.series-grid .series-cover img {
  aspect-ratio: 16 / 9;
}

.series-body {
  padding: 16px 18px 18px;
  min-width: 0;
}

.series-body .series-no {
  margin: 0 0 2px;
}

.series-body h2 {
  font-size: 1.08rem;
  margin: 0 0 6px;
}

.series-summary {
  font-size: 0.88rem;
  color: var(--ink-soft);
  line-height: 1.75;
  margin: 0 0 12px;
}

.series-body h3 {
  font-family: var(--sans);
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  color: var(--teal);
  margin: 0 0 4px;
}

.series-body > p {
  font-size: 0.85rem;
  color: var(--muted);
  line-height: 1.7;
  margin: 0 0 12px;
}

.series-order {
  margin: 0;
  padding-left: 1.15em;
}

.series-order li {
  font-size: 0.85rem;
  color: var(--ink-soft);
  line-height: 1.7;
  margin-bottom: 4px;
}

.series-order li:last-child {
  margin-bottom: 0;
}

/* 专题与频道分工 */
.division {
  margin-bottom: 36px;
}

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

.division-col {
  background-color: var(--paper-white);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 18px 20px;
  min-width: 0;
}

.division-col h3 {
  font-size: 0.98rem;
  margin: 0 0 8px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--line);
}

.division-col p {
  font-size: 0.88rem;
  color: var(--ink-soft);
  line-height: 1.75;
  margin: 0 0 10px;
}

.division-col p:last-child {
  margin-bottom: 0;
}

/* ===== 观看指南 ===== */

.guide-layout {
  grid-template-columns: minmax(0, 1fr) minmax(0, 320px);
}

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

.guide-body .section-title {
  margin-bottom: 18px;
}

.step-block {
  padding: 18px 0;
  border-top: 1px solid var(--line);
}

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

.step-block .step-no {
  font-family: var(--mono);
  font-size: 0.76rem;
  letter-spacing: 0.06em;
  color: var(--copper);
  margin: 0 0 2px;
}

.step-block .step-title {
  font-size: 1.06rem;
  margin: 0 0 8px;
}

.step-block > p {
  font-size: 0.92rem;
  color: var(--ink-soft);
  line-height: 1.85;
  margin: 0 0 10px;
}

.step-block .step-done {
  font-size: 0.86rem;
  color: var(--teal);
  line-height: 1.7;
  margin: 0;
  padding: 10px 14px;
  background-color: var(--paper-white);
  border: 1px solid var(--line);
  border-left: 2px solid var(--teal);
  border-radius: 0 var(--radius) var(--radius) 0;
}

.step-done-label {
  font-family: var(--sans);
  font-weight: 600;
  margin-right: 6px;
}

.guide-figure {
  overflow: hidden;
  border-radius: var(--radius);
  border: 1px solid var(--line);
  background-color: var(--paper-white);
  margin: 20px 0 0;
}

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

.guide-figure figcaption {
  padding: 8px 14px;
  margin: 0;
}

/* 指南侧栏 */
.guide-aside {
  min-width: 0;
}

.aside-card {
  background-color: var(--paper-white);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 18px;
  margin-bottom: 16px;
}

.aside-card-title {
  font-size: 0.98rem;
  margin: 0 0 12px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--line);
}

.need-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.need-list li {
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding: 8px 0;
  margin: 0;
  border-top: 1px dashed var(--line);
}

.need-list li:first-child {
  border-top: 0;
  padding-top: 0;
}

.need-name {
  font-size: 0.86rem;
  color: var(--ink-soft);
  line-height: 1.65;
}

.check-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.check-list li {
  font-size: 0.86rem;
  color: var(--ink-soft);
  line-height: 1.65;
  margin: 0 0 8px;
  padding-left: 20px;
  position: relative;
}

.check-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.42em;
  width: 11px;
  height: 11px;
  border: 1px solid var(--teal);
  border-radius: 2px;
}

.aside-card-link {
  border-left: 3px solid var(--copper);
  border-radius: 0 var(--radius) var(--radius) 0;
}

.aside-card-link p {
  font-size: 0.86rem;
  color: var(--ink-soft);
  line-height: 1.7;
  margin: 0;
}

.aside-card-link a {
  color: var(--copper);
}

.aside-card-link a:hover {
  border-bottom: 1px solid var(--copper);
}

/* 常见卡点 */
.pitfall-section {
  margin-bottom: 36px;
}

.pitfall-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
}

.pitfall-item {
  margin: 0;
  padding: 16px 18px;
  background-color: var(--paper-white);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.pitfall-name {
  font-size: 0.94rem;
  margin: 0 0 8px;
}

.pitfall-symptom {
  font-size: 0.84rem;
  color: var(--copper-deep);
  line-height: 1.7;
  margin: 0 0 8px;
}

.pitfall-fix {
  font-size: 0.84rem;
  color: var(--ink-soft);
  line-height: 1.7;
  margin: 0;
  padding-top: 8px;
  border-top: 1px dashed var(--line);
}

/* ===== 入口核验 ===== */

.check-principles {
  margin-bottom: 28px;
}

.principle-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
}

.principle-item {
  background-color: var(--paper-white);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 18px 20px;
  min-width: 0;
}

.principle-no {
  font-family: var(--mono);
  font-size: 0.76rem;
  letter-spacing: 0.06em;
  color: var(--copper);
  margin: 0 0 2px;
}

.principle-item h3 {
  font-size: 1rem;
  margin: 0 0 8px;
}

.principle-why,
.principle-how {
  font-size: 0.86rem;
  line-height: 1.7;
  margin: 0 0 8px;
}

.principle-why {
  color: var(--ink-soft);
}

.principle-how {
  color: var(--teal);
  padding-top: 8px;
  border-top: 1px dashed var(--line);
  margin-bottom: 0;
}

.check-figure {
  overflow: hidden;
  border-radius: var(--radius);
  border: 1px solid var(--line);
  background-color: var(--paper-white);
  margin: 0 0 32px;
}

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

.check-figure figcaption {
  padding: 8px 14px;
  margin: 0;
}

.example-section,
.misconception-section,
.contrast-section {
  margin-bottom: 32px;
}

.example-list {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
}

.example-item {
  background-color: var(--paper-white);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 18px 20px;
  min-width: 0;
}

.example-item.example-counter {
  border-left: 3px solid var(--copper);
  border-radius: 0 var(--radius) var(--radius) 0;
}

.example-no {
  font-family: var(--mono);
  font-size: 0.76rem;
  letter-spacing: 0.06em;
  color: var(--copper);
  margin: 0 0 2px;
}

.example-item h3 {
  font-size: 0.98rem;
  margin: 0 0 8px;
}

.example-scene,
.example-do,
.example-result {
  font-size: 0.85rem;
  line-height: 1.7;
  margin: 0 0 8px;
}

.example-scene {
  color: var(--muted);
}

.example-do {
  color: var(--ink-soft);
}

.example-result {
  color: var(--teal);
  padding-top: 8px;
  border-top: 1px dashed var(--line);
  margin-bottom: 0;
}

.misconception-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}

.misconception-item {
  margin: 0;
  padding: 14px 18px;
  background-color: var(--paper-white);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.misconception-wrong {
  font-size: 0.88rem;
  color: var(--copper-deep);
  line-height: 1.7;
  margin: 0 0 6px;
  padding-left: 16px;
  position: relative;
}

.misconception-wrong::before {
  content: "\00D7";
  position: absolute;
  left: 0;
  font-weight: 700;
}

.misconception-right {
  font-size: 0.88rem;
  color: var(--ink-soft);
  line-height: 1.7;
  margin: 0;
  padding-left: 16px;
  position: relative;
}

.misconception-right::before {
  content: "\2192";
  position: absolute;
  left: 0;
  color: var(--teal);
}

/* ===== 反馈说明 ===== */

.feedback-routing {
  margin-bottom: 32px;
}

.routing-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
}

.routing-card {
  background-color: var(--paper-white);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 18px 20px;
  min-width: 0;
}

.card-no {
  font-family: var(--mono);
  font-size: 0.76rem;
  letter-spacing: 0.06em;
  color: var(--copper);
  margin: 0 0 2px;
}

.routing-card h3 {
  font-size: 1rem;
  margin: 0 0 8px;
}

.card-desc {
  font-size: 0.88rem;
  color: var(--ink-soft);
  line-height: 1.75;
  margin: 0 0 12px;
}

.card-detail {
  margin: 0;
  padding-top: 10px;
  border-top: 1px dashed var(--line);
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 6px 12px;
}

.card-detail dt {
  font-size: 0.8rem;
  color: var(--copper-deep);
  white-space: nowrap;
}

.card-detail dd {
  font-size: 0.84rem;
  color: var(--muted);
  margin: 0;
  line-height: 1.65;
}

.flow-figure {
  overflow: hidden;
  border-radius: var(--radius);
  border: 1px solid var(--line);
  background-color: var(--paper-white);
  margin: 0 0 32px;
}

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

.flow-figure figcaption {
  padding: 8px 14px;
  margin: 0;
}

.info-prepare,
.info-boundary {
  margin-bottom: 32px;
}

.info-list {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--line);
}

.info-list li {
  display: grid;
  grid-template-columns: minmax(120px, 200px) minmax(0, 1fr);
  gap: 4px 16px;
  padding: 10px 0;
  margin: 0;
  border-bottom: 1px solid var(--line);
}

.info-key {
  font-family: var(--serif);
  font-size: 0.92rem;
  font-weight: 600;
  color: var(--ink);
}

.info-desc {
  font-size: 0.86rem;
  color: var(--muted);
  line-height: 1.7;
}

.boundary-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
}

.boundary-list li {
  margin: 0;
  padding: 16px 18px;
  background-color: var(--paper-white);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  min-width: 0;
}

.boundary-list h3 {
  font-size: 0.94rem;
  margin: 0 0 6px;
}

.boundary-list p {
  font-size: 0.85rem;
  color: var(--ink-soft);
  line-height: 1.7;
  margin: 0;
}

.faq-block {
  margin-bottom: 32px;
}

/* ===== 关于本站 ===== */

.about-position {
  display: grid;
  grid-template-columns: minmax(0, 1.2fr) minmax(0, 1fr);
  gap: 28px;
  align-items: start;
  margin-bottom: 32px;
  padding-bottom: 28px;
  border-bottom: 1px solid var(--line);
}

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

.position-copy h2 {
  font-size: 1.2rem;
  margin: 0 0 10px;
}

.position-copy p {
  font-size: 0.92rem;
  color: var(--ink-soft);
  line-height: 1.85;
  margin: 0 0 10px;
}

.position-copy p:last-child {
  margin-bottom: 0;
}

.position-figure {
  overflow: hidden;
  border-radius: var(--radius);
  border: 1px solid var(--line);
  background-color: var(--paper-white);
  min-width: 0;
}

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

.position-figure figcaption {
  padding: 8px 14px;
  margin: 0;
}

.about-boundary {
  margin-bottom: 32px;
  padding-bottom: 28px;
  border-bottom: 1px solid var(--line);
}

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

/* 栏目分工表格 */
.about-columns {
  margin-bottom: 32px;
  padding-bottom: 28px;
  border-bottom: 1px solid var(--line);
}

.column-ledger {
  width: 100%;
  border-collapse: collapse;
  background-color: var(--paper-white);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}

.column-ledger caption {
  caption-side: top;
  text-align: left;
  font-size: 0.8rem;
  color: var(--muted);
  padding: 0 0 8px;
}

.column-ledger thead th {
  font-family: var(--sans);
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  color: var(--muted);
  text-align: left;
  padding: 10px 14px;
  background-color: var(--paper);
  border-bottom: 1px solid var(--line);
}

.column-ledger tbody th,
.column-ledger tbody td {
  font-size: 0.86rem;
  text-align: left;
  vertical-align: top;
  padding: 10px 14px;
  border-bottom: 1px solid var(--line);
  line-height: 1.7;
}

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

.column-ledger tbody th {
  font-family: var(--serif);
  font-weight: 600;
  color: var(--ink);
  white-space: nowrap;
}

.column-ledger tbody td {
  color: var(--ink-soft);
}

.column-ledger tbody th a:hover {
  color: var(--copper);
}

/* 命名规则与不接受内容 */
.about-rules {
  margin-bottom: 32px;
  padding-bottom: 28px;
  border-bottom: 1px solid var(--line);
}

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

.rules-col {
  background-color: var(--paper-white);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 18px 20px;
  min-width: 0;
}

.rules-col h3 {
  font-size: 0.98rem;
  margin: 0 0 10px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--line);
}

.rules-list {
  margin: 0;
  padding-left: 1.2em;
}

.rules-list li {
  font-size: 0.86rem;
  color: var(--ink-soft);
  line-height: 1.75;
  margin-bottom: 8px;
}

.rules-list li:last-child {
  margin-bottom: 0;
}

/* 校对方式 */
.about-proof {
  margin-bottom: 32px;
}

.proof-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
  counter-reset: proof;
}

.proof-list li {
  margin: 0;
  padding: 16px 18px;
  background-color: var(--paper-white);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  min-width: 0;
}

.proof-list h3 {
  font-size: 0.94rem;
  margin: 0 0 6px;
}

.proof-list p {
  font-size: 0.85rem;
  color: var(--ink-soft);
  line-height: 1.7;
  margin: 0;
}

/* ===== 404 ===== */

.error-main {
  padding-top: 40px;
  padding-bottom: 60px;
}

.error-panel {
  max-width: 680px;
  margin: 0 auto;
  text-align: center;
  padding: 32px 24px 36px;
  background-color: var(--paper-white);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.error-code {
  font-family: var(--mono);
  font-size: 2.4rem;
  letter-spacing: 0.06em;
  color: var(--copper);
  margin: 0 0 8px;
}

.error-panel h1 {
  font-size: clamp(1.4rem, 3vw, 1.8rem);
  margin: 0 0 12px;
}

.error-lead {
  font-size: 0.94rem;
  color: var(--ink-soft);
  line-height: 1.8;
  margin: 0 0 22px;
}

.error-paths {
  list-style: none;
  margin: 0 0 24px;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 12px;
}

.error-paths li {
  margin: 0;
}

.error-paths a {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 0 20px;
  font-size: 0.9rem;
  border-radius: var(--radius);
  background-color: var(--ink);
  color: #fff;
  border: 1px solid var(--ink);
}

.error-paths a:hover {
  background-color: var(--copper);
  border-color: var(--copper);
  color: #fff;
}

.error-tips {
  text-align: left;
  border-top: 1px solid var(--line);
  padding-top: 18px;
}

.error-tips h2 {
  font-size: 0.98rem;
  margin: 0 0 10px;
}

.error-tips ul {
  list-style: none;
  margin: 0;
  padding: 0;
}

.error-tips li {
  font-size: 0.88rem;
  margin: 0 0 8px;
  padding-left: 16px;
  position: relative;
}

.error-tips li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.62em;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background-color: var(--copper);
}

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

.error-tips a:hover {
  color: var(--copper);
}

/* --------------------------------------------------------------------------
   5. responsive
   -------------------------------------------------------------------------- */

/* 1180 及以下：正文列自适应 */
@media (max-width: 1180px) {
  .page-layout {
    grid-template-columns: minmax(0, 1fr) minmax(0, 320px);
  }

  .sidebar-left .page-layout {
    grid-template-columns: minmax(0, 240px) minmax(0, 1fr);
  }
}

/* 900 及以下：折叠多栏 */
@media (max-width: 900px) {
  .header-inner {
    gap: 16px;
    padding: 12px 20px;
  }

  .nav-toggle {
    display: flex;
    margin-left: auto;
  }

  .site-nav {
    flex: 0 0 100%;
    order: 3;
    display: none;
  }

  .site-nav.is-open {
    display: block;
  }

  .primary-nav ul {
    flex-direction: column;
    gap: 0;
    border-top: 1px solid var(--line);
    padding-top: 6px;
  }

  .primary-nav li {
    border-bottom: 1px solid var(--line);
  }

  .primary-nav a {
    display: block;
    min-height: 44px;
    padding: 10px 2px;
    border-bottom: 0;
  }

  .primary-nav a.is-current {
    border-bottom: 0;
    color: var(--copper);
  }

  .topic-strip ul {
    padding: 0 20px;
  }

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

  .hero {
    grid-template-columns: minmax(0, 1fr);
    grid-template-areas:
      "copy"
      "figure"
      "panel";
    gap: 22px;
    padding: 32px 0;
  }

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

  .editorial-note {
    grid-template-columns: minmax(0, 1fr);
    gap: 20px;
    padding: 28px 0;
  }

  .home-directory {
    grid-template-columns: minmax(0, 1fr);
    gap: 26px;
    padding: 30px 0;
  }

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

  .prep-grid .prep-step:last-child {
    grid-column: 1 / -1;
  }

  .feedback-cue {
    grid-template-columns: minmax(0, 1fr);
    gap: 14px;
  }

  .footer-inner {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 26px 28px;
    padding: 36px 20px 22px;
  }

  .footer-bottom p {
    padding-left: 20px;
    padding-right: 20px;
  }

  /* 内页两栏统一转单栏，主内容在前 */
  .page-layout,
  .guide-layout,
  .sidebar-left .page-layout {
    grid-template-columns: minmax(0, 1fr);
    gap: 24px;
  }

  .sidebar-left .topic-aside {
    order: 2;
  }

  .sidebar-left .group-catalog {
    order: 1;
  }

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

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

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

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

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

  .boundary-list,
  .about-boundary .boundary-list,
  .proof-list {
    grid-template-columns: minmax(0, 1fr);
  }

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

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

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

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

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

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

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

  .ledger-row {
    grid-template-columns: 36px minmax(0, 1fr) auto;
  }

  .ledger-desc {
    grid-column: 2 / -1;
  }
}

/* 640 及以下：手机单列 */
@media (max-width: 640px) {
  body.site-body {
    font-size: 15.5px;
  }

  .header-inner {
    padding: 10px 16px;
    gap: 12px;
  }

  .brand-name {
    font-size: 1.16rem;
  }

  .brand-slogan {
    font-size: 0.68rem;
  }

  .topic-strip ul {
    padding: 0 16px;
  }

  .topic-strip a {
    padding: 8px 10px;
    font-size: 0.78rem;
  }

  .site-main {
    padding: 0 16px;
  }

  .inner-main {
    padding-top: 18px;
    padding-bottom: 40px;
  }

  .breadcrumb {
    font-size: 0.78rem;
    margin-bottom: 14px;
  }

  .page-title {
    font-size: 1.5rem;
  }

  .page-lead {
    font-size: 0.92rem;
  }

  .hero {
    padding: 26px 0;
    gap: 18px;
  }

  .hero-copy h1 {
    font-size: 1.5rem;
  }

  .hero-lead {
    font-size: 0.92rem;
  }

  .hero-actions {
    gap: 10px;
  }

  .hero-actions .btn {
    flex: 1 1 140px;
  }

  .task-panel {
    grid-template-columns: minmax(0, 1fr);
    gap: 10px;
  }

  .task-cell {
    padding: 14px 14px 12px;
  }

  .editorial-note {
    padding: 24px 0;
  }

  .home-directory {
    padding: 24px 0;
  }

  .ledger-row {
    grid-template-columns: 32px minmax(0, 1fr);
    gap: 2px 10px;
    padding: 10px 2px;
  }

  .ledger-desc {
    grid-column: 2 / -1;
    font-size: 0.82rem;
  }

  .ledger-tag {
    grid-column: 2 / -1;
    justify-self: start;
    margin-top: 2px;
  }

  .series-rail {
    padding: 16px;
  }

  .prep-grid {
    grid-template-columns: minmax(0, 1fr);
    gap: 12px;
  }

  .prep-grid .prep-step:last-child {
    grid-column: auto;
  }

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

  .feedback-cue {
    padding: 18px;
    margin: 24px 0;
  }

  .feedback-cue .btn {
    width: 100%;
  }

  .summary-block,
  .conclusion,
  .conclusion-block,
  .verdict-block {
    padding: 14px 16px;
    margin-bottom: 22px;
  }

  .summary-quote,
  .summary-text,
  .verdict-quote,
  .conclusion > p:first-child,
  .conclusion-quote p:first-child {
    font-size: 0.96rem;
  }

  .entry-list li {
    grid-template-columns: minmax(0, 1fr);
    gap: 2px;
  }

  .info-list li {
    grid-template-columns: minmax(0, 1fr);
    gap: 2px;
  }

  .card-detail {
    grid-template-columns: minmax(0, 1fr);
    gap: 2px;
  }

  .card-detail dt {
    margin-top: 4px;
  }

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

  .archive-cols,
  .archive-columns {
    grid-template-columns: minmax(0, 1fr);
    gap: 18px;
  }

  .column-ledger {
    display: block;
    overflow-x: auto;
  }

  .column-ledger thead th,
  .column-ledger tbody th,
  .column-ledger tbody td {
    padding: 9px 10px;
    font-size: 0.82rem;
  }

  .column-ledger tbody th {
    white-space: normal;
  }

  .error-panel {
    padding: 26px 18px 28px;
  }

  .error-code {
    font-size: 2rem;
  }

  .error-paths {
    flex-direction: column;
  }

  .error-paths a {
    width: 100%;
    justify-content: center;
  }

  .footer-inner {
    grid-template-columns: minmax(0, 1fr);
    gap: 22px;
    padding: 30px 16px 20px;
  }

  .footer-bottom p {
    padding-left: 16px;
    padding-right: 16px;
    font-size: 0.74rem;
  }
}

/* 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;
  }
}