/* ==========================================================================
   吃瓜视频 · 全站样式表
   结构：base / layout / components / pages / responsive
   ========================================================================== */

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

:root {
  --c-primary: #2B4C7E;
  --c-primary-dark: #1F3A61;
  --c-accent: #D97757;
  --c-accent-soft: #F3DFD6;
  --c-bg: #F6F2EA;
  --c-surface: #FFFFFF;
  --c-ink: #1C1F26;
  --c-ink-soft: #4A505C;
  --c-line: #D9D2C6;
  --c-ok: #4F7A5A;
  --radius: 8px;
  --radius-sm: 4px;
  --shadow-card: 0 1px 2px rgba(28, 31, 38, .06), 0 6px 16px rgba(28, 31, 38, .05);
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", "Source Han Sans SC", sans-serif;
  --font-serif: Georgia, "Songti SC", "Noto Serif SC", "Source Han Serif SC",
    "SimSun", serif;
  --wrap: 1120px;
  --wrap-narrow: 860px;
  --wrap-read: 760px;
  --gap: 24px;
}

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

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

body {
  margin: 0;
  padding: 0;
  background: var(--c-bg);
  color: var(--c-ink);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.8;
  text-rendering: optimizeLegibility;
}

h1,
h2,
h3,
h4 {
  font-family: var(--font-serif);
  color: var(--c-ink);
  line-height: 1.4;
  margin: 0 0 .6em;
  font-weight: 700;
}

h1 {
  font-size: 32px;
}

h2 {
  font-size: 24px;
}

h3 {
  font-size: 18px;
}

p {
  margin: 0 0 1em;
}

a {
  color: var(--c-primary);
  text-decoration: none;
  transition: color .18s ease, background-color .18s ease, border-color .18s ease;
}

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

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

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

ul,
ol {
  margin: 0 0 1em;
  padding-left: 1.25em;
}

li {
  margin-bottom: .35em;
}

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

button {
  font: inherit;
  color: inherit;
  cursor: pointer;
}

figure {
  margin: 0;
}

figcaption {
  font-size: 13px;
  color: var(--c-ink-soft);
  line-height: 1.7;
  margin-top: 8px;
}

time {
  font-variant-numeric: tabular-nums;
}

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

.site-body {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  background: var(--c-bg);
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 40;
  background: var(--c-surface);
  border-bottom: 1px solid var(--c-line);
}

.header-inner {
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 12px 20px;
  display: flex;
  align-items: center;
  gap: 20px;
  flex-wrap: wrap;
}

.brand {
  display: flex;
  flex-direction: column;
  gap: 2px;
  color: var(--c-ink);
  flex: 0 0 auto;
}

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

.brand-name {
  font-family: var(--font-serif);
  font-size: 21px;
  font-weight: 700;
  line-height: 1.2;
}

.brand-slogan {
  font-size: 12px;
  color: var(--c-ink-soft);
  line-height: 1.4;
}

.site-nav {
  margin-left: auto;
}

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

.nav-list li {
  margin: 0;
}

.nav-list a {
  display: flex;
  align-items: center;
  min-height: 44px;
  padding: 0 12px;
  border-radius: var(--radius-sm);
  font-size: 15px;
  color: var(--c-ink-soft);
  white-space: nowrap;
}

.nav-list a:hover,
.nav-list a:focus-visible {
  background: var(--c-accent-soft);
  color: var(--c-primary);
}

.nav-list a.is-current {
  color: var(--c-primary);
  font-weight: 700;
  background: #EDF1F8;
}

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

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

.site-main {
  flex: 1 1 auto;
  width: 100%;
}

.inner-main {
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 0 20px 56px;
}

.breadcrumb {
  font-size: 14px;
  color: var(--c-ink-soft);
  margin: 0 0 16px;
}

nav.breadcrumb ol {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px;
  margin: 0;
  padding: 0;
}

nav.breadcrumb li {
  margin: 0;
}

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

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

.page-header {
  margin: 0 0 18px;
}

.page-title {
  font-size: 32px;
  margin: 0;
  color: var(--c-ink);
}

.page-title-section,
section.page-title {
  background: #FBF7F0;
  border: 1px solid var(--c-line);
  border-radius: var(--radius);
  padding: 20px 24px;
  margin: 0 0 32px;
}

.page-title-inner {
  max-width: var(--wrap-read);
}

.page-lead,
.page-title-lead,
.page-title-desc,
.page-intro {
  font-size: 16px;
  color: var(--c-ink-soft);
  margin: 0 0 8px;
  max-width: var(--wrap-read);
}

.page-title-meta,
.page-meta {
  font-size: 13px;
  color: var(--c-ink-soft);
  margin: 0;
}

.page-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 300px;
  gap: 40px;
  align-items: start;
}

.sidebar-left .page-layout,
.page-layout.sidebar-left {
  grid-template-columns: 300px minmax(0, 1fr);
}

.layout-shell {
  grid-template-columns: minmax(0, 760px) 300px;
  justify-content: space-between;
}

.layout-main {
  min-width: 0;
}

.layout-aside,
.sidebar,
.side-panel {
  min-width: 0;
}

.content-column {
  min-width: 0;
}

.site-footer {
  background: #22314A;
  color: #D9DEE8;
  margin-top: 40px;
}

.footer-inner {
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 40px 20px 24px;
}

.footer-top {
  display: flex;
  flex-wrap: wrap;
  gap: 24px;
  justify-content: space-between;
  align-items: flex-start;
  padding-bottom: 24px;
  border-bottom: 1px solid rgba(217, 222, 232, .18);
}

.footer-brand {
  max-width: 340px;
}

.footer-brand-name {
  font-family: var(--font-serif);
  font-size: 20px;
  color: #FFFFFF;
  margin: 0 0 6px;
}

.footer-brand-desc {
  font-size: 14px;
  color: #B9C2D2;
  margin: 0;
  line-height: 1.7;
}

.footer-nav ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 6px 18px;
}

.footer-nav li {
  margin: 0;
}

.footer-nav a {
  color: #D9DEE8;
  font-size: 14px;
  display: inline-flex;
  align-items: center;
  min-height: 44px;
}

.footer-nav a:hover,
.footer-nav a:focus-visible {
  color: #FFFFFF;
}

.footer-groups {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 24px;
  padding: 28px 0;
}

.footer-group h3 {
  font-family: var(--font-sans);
  font-size: 14px;
  color: #FFFFFF;
  margin: 0 0 10px;
}

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

.footer-group li {
  margin: 0 0 2px;
}

.footer-group a {
  color: #B9C2D2;
  font-size: 14px;
  display: inline-flex;
  align-items: center;
  min-height: 36px;
}

.footer-group a:hover,
.footer-group a:focus-visible {
  color: #FFFFFF;
}

.footer-bottom {
  border-top: 1px solid rgba(217, 222, 232, .18);
  padding-top: 16px;
}

.footer-copy {
  font-size: 13px;
  color: #9AA5B8;
  margin: 0;
}

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

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0 22px;
  border-radius: var(--radius-sm);
  font-size: 15px;
  font-weight: 700;
  border: 1px solid transparent;
  text-align: center;
}

.btn-primary {
  background: var(--c-primary);
  border-color: var(--c-primary);
  color: #FFFFFF;
}

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

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

.btn-ghost:hover,
.btn-ghost:focus-visible {
  background: var(--c-primary);
  color: #FFFFFF;
}

.text-link {
  font-size: 15px;
  font-weight: 700;
  display: inline-flex;
  align-items: center;
  min-height: 44px;
}

.text-link::after {
  content: "→";
  margin-left: 6px;
  font-weight: 400;
}

.link-inline {
  font-size: 14px;
  font-weight: 700;
  display: inline-flex;
  align-items: center;
  min-height: 44px;
}

.section-inner {
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 0 20px;
}

.section-head {
  margin: 0 0 20px;
}

.section-head h2 {
  margin: 0 0 6px;
}

.section-desc,
.section-intro,
.section-lead,
.section-note {
  color: var(--c-ink-soft);
  font-size: 15px;
  max-width: var(--wrap-read);
}

.section-more {
  margin: 20px 0 0;
}

.topic-tag {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 0 16px;
  border-radius: 999px;
  background: var(--c-accent-soft);
  color: #8C4326;
  font-size: 14px;
  font-weight: 700;
  border: 1px solid #E7C7B8;
}

.topic-tag:hover,
.topic-tag:focus-visible {
  background: var(--c-accent);
  border-color: var(--c-accent);
  color: #FFFFFF;
}

.topic-tag-sm {
  min-height: 26px;
  padding: 0 10px;
  font-size: 12px;
  font-weight: 700;
}

.status-badge {
  display: inline-flex;
  align-items: center;
  min-height: 26px;
  padding: 0 10px;
  border-radius: var(--radius-sm);
  font-size: 12px;
  font-weight: 700;
  border: 1px solid transparent;
  white-space: nowrap;
}

.status-ongoing {
  background: #EDF1F8;
  color: var(--c-primary);
  border-color: #C9D6E8;
}

.status-completed {
  background: #E8F0EA;
  color: var(--c-ok);
  border-color: #C4D8C9;
}

.status-sorting,
.status-adjusting {
  background: var(--c-accent-soft);
  color: #8C4326;
  border-color: #E7C7B8;
}

.faq-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.faq-item {
  background: var(--c-surface);
  border: 1px solid var(--c-line);
  border-radius: var(--radius);
  padding: 0 18px;
}

.faq-item summary {
  cursor: pointer;
  list-style: none;
  font-weight: 700;
  font-size: 16px;
  padding: 14px 30px 14px 0;
  position: relative;
  min-height: 44px;
  display: flex;
  align-items: center;
}

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

.faq-item summary::after {
  content: "+";
  position: absolute;
  right: 0;
  top: 50%;
  transform: translateY(-50%);
  color: var(--c-accent);
  font-size: 20px;
  line-height: 1;
}

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

.faq-item p {
  margin: 0 0 16px;
  color: var(--c-ink-soft);
  font-size: 15px;
}

.related-links {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px 16px;
  margin-top: 32px;
  padding: 16px 20px;
  background: var(--c-surface);
  border: 1px solid var(--c-line);
  border-radius: var(--radius);
}

.related-links-label {
  font-size: 14px;
  font-weight: 700;
  color: var(--c-ink-soft);
}

.related-links-item {
  font-size: 14px;
  font-weight: 700;
  display: inline-flex;
  align-items: center;
  min-height: 44px;
}

.aside-block {
  background: var(--c-surface);
  border: 1px solid var(--c-line);
  border-radius: var(--radius);
  padding: 18px 20px;
  margin-bottom: 20px;
}

.aside-title,
.side-title {
  font-size: 17px;
  margin: 0 0 12px;
}

.aside-list,
.aside-link-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.aside-list li {
  margin: 0 0 8px;
}

.aside-list a {
  font-size: 14px;
  display: inline-flex;
  align-items: center;
  min-height: 36px;
}

.aside-link-list li {
  margin: 0 0 12px;
}

.aside-link-list a {
  display: block;
  font-size: 14px;
  font-weight: 700;
}

.aside-link-note {
  display: block;
  font-size: 13px;
  color: var(--c-ink-soft);
  line-height: 1.6;
}

.aside-text,
.aside-cta {
  font-size: 14px;
  color: var(--c-ink-soft);
  margin: 0;
}

.cover-grid {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 20px;
}

.cover-card {
  margin: 0;
  background: var(--c-surface);
  border: 1px solid var(--c-line);
  border-radius: var(--radius);
  overflow: hidden;
  transition: transform .18s ease, box-shadow .18s ease, border-color .18s ease;
}

.cover-card:hover,
.cover-card:focus-within {
  transform: translateY(-3px);
  border-color: #C6BBA8;
  box-shadow: var(--shadow-card);
}

.cover-link {
  display: block;
  color: var(--c-ink);
  padding: 0 0 16px;
}

.cover-link:hover,
.cover-link:focus-visible {
  color: var(--c-ink);
}

.cover-media {
  margin: 0;
  aspect-ratio: 3 / 4;
  background: #EFE9DE;
  overflow: hidden;
}

.cover-media img,
.cover-card figure img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.cover-title {
  font-size: 16px;
  margin: 14px 16px 6px;
}

.cover-meta {
  font-size: 13px;
  color: var(--c-accent);
  font-weight: 700;
  margin: 0 16px 4px;
}

.cover-volume {
  font-size: 13px;
  color: var(--c-ink-soft);
  margin: 0 16px;
}

.cover-topic {
  font-size: 13px;
  color: var(--c-accent);
  font-weight: 700;
  margin: 0 16px 4px;
}

.table-scroll {
  overflow-x: auto;
  border: 1px solid var(--c-line);
  border-radius: var(--radius);
  background: var(--c-surface);
}

.data-table,
.catalog-table {
  min-width: 620px;
  font-size: 15px;
}

.data-table caption,
.catalog-table caption {
  caption-side: top;
  text-align: left;
  font-size: 13px;
  color: var(--c-ink-soft);
  padding: 12px 16px 0;
}

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

.data-table thead th,
.catalog-table thead th {
  background: #F1ECE2;
  font-size: 14px;
  white-space: nowrap;
}

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

.data-table tbody tr:hover,
.catalog-table tbody tr:hover {
  background: #FBF7F0;
}

.step-list {
  list-style: none;
  margin: 0;
  padding: 0;
  counter-reset: step;
  display: grid;
  gap: 14px;
}

.step-item {
  position: relative;
  background: var(--c-surface);
  border: 1px solid var(--c-line);
  border-radius: var(--radius);
  padding: 16px 20px 16px 62px;
  margin: 0;
  counter-increment: step;
}

.step-item::before {
  content: counter(step);
  position: absolute;
  left: 18px;
  top: 16px;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: var(--c-primary);
  color: #FFFFFF;
  font-size: 14px;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
}

.step-item h3 {
  font-size: 16px;
  margin: 0 0 6px;
}

.step-item p {
  font-size: 15px;
  color: var(--c-ink-soft);
  margin: 0 0 6px;
}

.card-grid {
  display: grid;
  gap: 20px;
}

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

.topic-card {
  background: var(--c-surface);
  border: 1px solid var(--c-line);
  border-radius: var(--radius);
  padding: 0 0 16px;
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

.card-media {
  margin: 0;
  aspect-ratio: 4 / 3;
  background: #EFE9DE;
  overflow: hidden;
}

.card-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.topic-card h3 {
  font-size: 17px;
  margin: 14px 16px 6px;
}

.topic-card p {
  font-size: 14px;
  color: var(--c-ink-soft);
  margin: 0 16px 10px;
  flex: 1 1 auto;
}

.card-link {
  font-size: 14px;
  font-weight: 700;
  margin: 0 16px;
  display: inline-flex;
  align-items: center;
  min-height: 44px;
}

.field-key-list {
  margin: 0;
  background: var(--c-surface);
  border: 1px solid var(--c-line);
  border-radius: var(--radius);
  padding: 6px 20px;
}

.field-key-list dt {
  font-weight: 700;
  font-size: 15px;
  padding-top: 14px;
}

.field-key-list dd {
  margin: 0;
  padding-bottom: 14px;
  font-size: 14px;
  color: var(--c-ink-soft);
  border-bottom: 1px solid var(--c-line);
}

.field-key-list dd:last-child {
  border-bottom: 0;
}

.page-media,
.section-media,
.path-figure,
.content-figure,
.timeline-figure {
  margin: 0 0 28px;
  background: var(--c-surface);
  border: 1px solid var(--c-line);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-media img,
.section-media img,
.path-figure img,
.content-figure img,
.timeline-figure img {
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 9;
  object-fit: cover;
}

.page-media figcaption,
.section-media figcaption,
.path-figure figcaption,
.content-figure figcaption,
.timeline-figure figcaption {
  padding: 10px 16px 12px;
  margin: 0;
}

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

/* --- 首页 ---------------------------------------------------------------- */

.home-main {
  display: block;
}

.hero {
  background: var(--c-surface);
  border-bottom: 1px solid var(--c-line);
  padding: 40px 0 44px;
}

.hero-inner {
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 0 20px;
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 420px);
  gap: 40px;
  align-items: center;
}

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

.hero-eyebrow {
  font-size: 13px;
  font-weight: 700;
  color: var(--c-accent);
  margin: 0 0 10px;
}

.hero-copy h1 {
  font-size: 34px;
  margin: 0 0 14px;
}

.hero-lead {
  font-size: 16px;
  color: var(--c-ink-soft);
  max-width: 560px;
  margin: 0 0 22px;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 26px;
}

.hero-stats {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 32px;
  margin: 0;
  padding: 0;
}

.hero-stat {
  margin: 0;
}

.hero-stat dt {
  font-size: 13px;
  color: var(--c-ink-soft);
}

.hero-stat dd {
  margin: 0;
  font-family: var(--font-serif);
  font-size: 19px;
  font-weight: 700;
  color: var(--c-primary);
}

.hero-media {
  margin: 0;
  border: 1px solid var(--c-line);
  border-radius: var(--radius);
  overflow: hidden;
  background: #EFE9DE;
}

.hero-media img {
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
}

.hero-media figcaption {
  padding: 10px 16px 12px;
  margin: 0;
}

.topic-quickstrip,
.today-updates,
.catalog-featured,
.update-timeline,
.reading-guide-entry,
.faq-preview {
  padding: 44px 0 0;
}

.tag-strip {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.tag-strip li {
  margin: 0;
}

.update-list {
  list-style: none;
  margin: 0;
  padding: 0;
  background: var(--c-surface);
  border: 1px solid var(--c-line);
  border-radius: var(--radius);
}

.update-list li {
  margin: 0;
}

.update-item {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px 14px;
  padding: 14px 20px;
  border-bottom: 1px solid var(--c-line);
}

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

.update-time {
  font-size: 13px;
  color: var(--c-ink-soft);
  flex: 0 0 auto;
}

.update-volume {
  font-size: 14px;
  color: var(--c-ink-soft);
}

.update-link {
  font-size: 15px;
  font-weight: 700;
  margin-left: auto;
  display: inline-flex;
  align-items: center;
  min-height: 44px;
}

.timeline-track {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 12px;
}

.timeline-node {
  margin: 0;
}

.timeline-node a {
  display: flex;
  flex-direction: column;
  gap: 6px;
  min-height: 44px;
  padding: 16px;
  background: var(--c-surface);
  border: 1px solid var(--c-line);
  border-top: 3px solid var(--c-accent);
  border-radius: var(--radius);
  color: var(--c-ink);
}

.timeline-node a:hover,
.timeline-node a:focus-visible {
  border-color: var(--c-primary);
  border-top-color: var(--c-primary);
  color: var(--c-primary);
}

.timeline-quarter {
  font-family: var(--font-serif);
  font-size: 17px;
  font-weight: 700;
}

.timeline-months {
  font-size: 13px;
  color: var(--c-ink-soft);
  line-height: 1.6;
}

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

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

.guide-col h3 {
  font-size: 18px;
  margin: 0 0 12px;
}

.guide-list {
  margin: 0 0 12px;
  padding-left: 1.2em;
}

.guide-list li {
  font-size: 15px;
  color: var(--c-ink-soft);
}

.guide-col-link {
  margin: 0;
}

/* --- 内页通用版式 -------------------------------------------------------- */

.inner-main > .page-header,
.inner-main > section.page-title,
.inner-main > .page-title-section {
  max-width: 100%;
}

.section {
  margin-bottom: 40px;
}

.section h2 {
  margin: 0 0 8px;
}

.section-intro,
.section-lead,
.section-desc {
  margin: 0 0 18px;
}

.section-note {
  margin: 14px 0 0;
  font-size: 14px;
}

/* --- 题材指南 ------------------------------------------------------------ */

.section-topic-table .table-scroll {
  margin-bottom: 0;
}

.section-scene-order .step-list {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.section-topic-cards .card-grid-3 {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

/* --- 更新索引 ------------------------------------------------------------ */

.archive-switcher {
  background: var(--c-surface);
  border: 1px solid var(--c-line);
  border-radius: var(--radius);
  padding: 20px 24px;
  margin-bottom: 40px;
}

.archive-switcher h2 {
  font-size: 20px;
  margin: 0 0 16px;
}

.archive-group {
  padding: 0 0 14px;
  margin-bottom: 14px;
  border-bottom: 1px solid var(--c-line);
}

.archive-group:last-child {
  padding-bottom: 0;
  margin-bottom: 0;
  border-bottom: 0;
}

.archive-quarter {
  font-size: 16px;
  margin: 0 0 8px;
}

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

.archive-months li {
  margin: 0;
}

.archive-months a {
  display: inline-flex;
  align-items: center;
  min-height: 36px;
  padding: 0 12px;
  font-size: 14px;
  background: #F1ECE2;
  border: 1px solid var(--c-line);
  border-radius: var(--radius-sm);
  color: var(--c-ink-soft);
}

.archive-months a:hover,
.archive-months a:focus-visible {
  background: var(--c-primary);
  border-color: var(--c-primary);
  color: #FFFFFF;
}

.latest-list,
.recent-adjust-list,
.history-list {
  margin-bottom: 40px;
}

.update-items {
  list-style: none;
  margin: 0;
  padding: 0;
  background: var(--c-surface);
  border: 1px solid var(--c-line);
  border-radius: var(--radius);
}

.update-items li {
  margin: 0;
}

.update-title {
  font-size: 15px;
  font-weight: 700;
  flex: 1 1 200px;
  min-width: 0;
}

.volume-info {
  font-size: 14px;
  color: var(--c-ink-soft);
}

.adjust-grid {
  display: grid;
  gap: 12px;
}

.adjust-row {
  display: grid;
  grid-template-columns: minmax(160px, 240px) minmax(0, 1fr);
  gap: 20px;
  background: var(--c-surface);
  border: 1px solid var(--c-line);
  border-radius: var(--radius);
  padding: 16px 20px;
}

.adjust-type {
  font-weight: 700;
  font-size: 15px;
  margin: 0;
  color: var(--c-primary);
}

.adjust-note {
  margin: 0;
  font-size: 14px;
  color: var(--c-ink-soft);
}

.history-quarter {
  background: var(--c-surface);
  border: 1px solid var(--c-line);
  border-radius: var(--radius);
  padding: 18px 20px;
  margin-bottom: 14px;
}

.history-quarter h3 {
  font-size: 17px;
  margin: 0 0 10px;
}

.history-months {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px 16px;
}

.history-months li {
  margin: 0;
}

.history-months a {
  font-size: 14px;
  display: inline-flex;
  align-items: center;
  min-height: 36px;
}

/* --- 连载目录 ------------------------------------------------------------ */

.catalog-table-section,
.volume-status-section,
.cover-wall-section {
  margin-bottom: 40px;
}

.catalog-table {
  margin-top: 4px;
}

.cover-wall {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 20px;
}

.cover-wall .cover-card figure {
  margin: 0;
  aspect-ratio: 3 / 4;
  background: #EFE9DE;
  overflow: hidden;
}

/* --- 阅读指南 ------------------------------------------------------------ */

.reading-article {
  max-width: var(--wrap-read);
  margin: 0 auto;
}

.reading-steps,
.follow-status,
.reading-path,
.related-links {
  margin-bottom: 40px;
}

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

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

.follow-card h3 {
  font-size: 16px;
  margin: 0 0 8px;
}

.follow-where {
  font-size: 13px;
  font-weight: 700;
  color: var(--c-accent);
  margin: 0 0 8px;
}

.follow-card p {
  font-size: 14px;
  color: var(--c-ink-soft);
  margin: 0;
}

.reading-path p {
  font-size: 15px;
  color: var(--c-ink-soft);
}

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

.link-group {
  background: var(--c-surface);
  border: 1px solid var(--c-line);
  border-radius: var(--radius);
  padding: 18px 20px;
}

.link-group h3 {
  font-size: 16px;
  margin: 0 0 8px;
}

.link-group ul {
  list-style: none;
  margin: 0;
  padding: 0;
}

.link-group li {
  margin: 0;
}

.link-group a {
  font-size: 14px;
  display: inline-flex;
  align-items: center;
  min-height: 40px;
}

/* --- 作者关联 ------------------------------------------------------------ */

.side-panel {
  background: var(--c-surface);
  border: 1px solid var(--c-line);
  border-radius: var(--radius);
  padding: 20px;
}

.duty-key-list {
  margin: 0 0 20px;
}

.duty-key-item {
  padding: 12px 0;
  border-bottom: 1px solid var(--c-line);
}

.duty-key-item:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}

.duty-key-item dt {
  font-weight: 700;
  font-size: 15px;
  color: var(--c-primary);
}

.duty-key-item dd {
  margin: 4px 0 0;
  font-size: 14px;
  color: var(--c-ink-soft);
}

.side-links h3 {
  font-size: 16px;
  margin: 0 0 8px;
}

.side-links ul {
  list-style: none;
  margin: 0;
  padding: 0;
}

.side-links li {
  margin: 0;
}

.side-links a {
  font-size: 14px;
  display: inline-flex;
  align-items: center;
  min-height: 40px;
}

.author-entry-section,
.relation-rule-section,
.author-faq-section {
  margin-bottom: 40px;
}

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

.author-entry-card {
  background: var(--c-surface);
  border: 1px solid var(--c-line);
  border-radius: var(--radius);
  padding: 18px 20px;
  display: flex;
  flex-direction: column;
}

.author-entry-card h3 {
  font-size: 16px;
  margin: 0 0 8px;
}

.author-entry-card p {
  font-size: 14px;
  color: var(--c-ink-soft);
  margin: 0 0 8px;
  flex: 1 1 auto;
}

.author-entry-card .card-link {
  margin: 0;
}

.relation-steps {
  list-style: none;
  margin: 0;
  padding: 0;
  counter-reset: rel;
  display: grid;
  gap: 14px;
}

.relation-steps li {
  position: relative;
  background: var(--c-surface);
  border: 1px solid var(--c-line);
  border-radius: var(--radius);
  padding: 16px 20px 16px 62px;
  margin: 0;
  counter-increment: rel;
}

.relation-steps li::before {
  content: counter(rel);
  position: absolute;
  left: 18px;
  top: 16px;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: var(--c-accent);
  color: #FFFFFF;
  font-size: 14px;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
}

.relation-steps h3 {
  font-size: 16px;
  margin: 0 0 6px;
}

.relation-steps p {
  font-size: 15px;
  color: var(--c-ink-soft);
  margin: 0;
}

/* --- 常见疑问 ------------------------------------------------------------ */

.faq-columns {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 28px;
  margin-bottom: 40px;
}

.faq-group h2 {
  font-size: 22px;
  margin: 0 0 16px;
}

.faq-related-links h2 {
  margin: 0 0 8px;
}

.link-cards {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 16px;
}

.link-card {
  margin: 0;
}

.link-card a {
  display: flex;
  flex-direction: column;
  height: 100%;
  background: var(--c-surface);
  border: 1px solid var(--c-line);
  border-radius: var(--radius);
  padding: 18px 20px;
  color: var(--c-ink);
}

.link-card a:hover,
.link-card a:focus-visible {
  border-color: var(--c-primary);
  color: var(--c-primary);
}

.link-card h3 {
  font-size: 16px;
  margin: 0 0 6px;
}

.link-card p {
  font-size: 14px;
  color: var(--c-ink-soft);
  margin: 0;
}

/* --- 站内说明 ------------------------------------------------------------ */

.about-layout {
  display: block;
  max-width: var(--wrap-narrow);
  margin: 0 auto;
}

.content-block {
  margin-bottom: 40px;
}

.content-block h2 {
  margin: 0 0 12px;
}

.content-block p {
  font-size: 16px;
  color: var(--c-ink-soft);
}

.term-list {
  margin: 0 0 20px;
  background: var(--c-surface);
  border: 1px solid var(--c-line);
  border-radius: var(--radius);
  padding: 6px 20px;
}

.term-list dt {
  font-weight: 700;
  font-size: 15px;
  color: var(--c-primary);
  padding-top: 14px;
}

.term-list dd {
  margin: 0;
  padding-bottom: 14px;
  font-size: 14px;
  color: var(--c-ink-soft);
  border-bottom: 1px solid var(--c-line);
}

.term-list dd:last-child {
  border-bottom: 0;
}

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

.boundary-column {
  background: var(--c-surface);
  border: 1px solid var(--c-line);
  border-radius: var(--radius);
  padding: 18px 20px;
}

.boundary-column h3 {
  font-size: 16px;
  margin: 0 0 10px;
}

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

.boundary-list li {
  font-size: 14px;
  color: var(--c-ink-soft);
}

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

.structure-group {
  background: var(--c-surface);
  border: 1px solid var(--c-line);
  border-radius: var(--radius);
  padding: 18px 20px;
}

.structure-group h3 {
  font-size: 16px;
  margin: 0 0 8px;
}

.structure-group ul {
  list-style: none;
  margin: 0;
  padding: 0;
}

.structure-group li {
  margin: 0;
}

.structure-group a {
  font-size: 14px;
  display: inline-flex;
  align-items: center;
  min-height: 40px;
}

/* --- 404 ----------------------------------------------------------------- */

.error-main {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 72px 20px;
}

.error-inner {
  max-width: 640px;
  text-align: center;
}

.error-title {
  font-size: 30px;
  margin: 0 0 8px;
}

.error-code {
  font-family: var(--font-serif);
  font-size: 56px;
  font-weight: 700;
  color: var(--c-accent);
  line-height: 1;
  margin: 0 0 16px;
}

.error-text {
  font-size: 16px;
  color: var(--c-ink-soft);
  margin: 0 0 24px;
}

.error-actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 12px;
  margin-bottom: 28px;
}

.error-links {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 8px 20px;
}

.error-links li {
  margin: 0;
}

.error-links a {
  font-size: 14px;
  font-weight: 700;
  display: inline-flex;
  align-items: center;
  min-height: 44px;
}

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

@media (max-width: 1024px) {

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

  .hero-copy h1 {
    font-size: 30px;
  }

  .page-layout,
  .layout-shell,
  .sidebar-left .page-layout,
  .page-layout.sidebar-left {
    grid-template-columns: minmax(0, 1fr);
    gap: 32px;
  }

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

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

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

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

@media (max-width: 768px) {

  body {
    font-size: 16px;
  }

  h1,
  .page-title {
    font-size: 24px;
  }

  h2 {
    font-size: 20px;
  }

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

  .brand-name {
    font-size: 19px;
  }

  .nav-toggle {
    display: flex;
  }

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

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

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

  .nav-list a {
    min-height: 46px;
    padding: 0 12px;
    font-size: 16px;
  }

  .inner-main {
    padding: 0 16px 48px;
  }

  .section-inner,
  .hero-inner,
  .footer-inner {
    padding-left: 16px;
    padding-right: 16px;
  }

  .hero {
    padding: 28px 0 32px;
  }

  .hero-copy h1 {
    font-size: 24px;
  }

  .hero-stats {
    gap: 12px 24px;
  }

  .topic-quickstrip,
  .today-updates,
  .catalog-featured,
  .update-timeline,
  .reading-guide-entry,
  .faq-preview {
    padding-top: 32px;
  }

  .cover-grid,
  .cover-wall,
  .card-grid-3,
  .section-topic-cards .card-grid-3,
  .section-scene-order .step-list,
  .guide-columns,
  .follow-grid,
  .link-groups,
  .author-entry-grid,
  .boundary-columns,
  .structure-groups,
  .faq-columns {
    grid-template-columns: minmax(0, 1fr);
  }

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

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

  .adjust-row {
    grid-template-columns: minmax(0, 1fr);
    gap: 6px;
  }

  .update-item {
    padding: 12px 16px;
  }

  .update-link {
    margin-left: 0;
    flex: 1 1 100%;
  }

  .update-title {
    flex: 1 1 100%;
  }

  .page-title-section,
  section.page-title {
    padding: 16px 18px;
    margin-bottom: 24px;
  }

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

  .footer-top {
    flex-direction: column;
    gap: 12px;
  }

  .footer-nav ul {
    gap: 4px 16px;
  }
}

@media (max-width: 480px) {

  .hero-copy h1 {
    font-size: 22px;
  }

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

  .btn {
    width: 100%;
  }

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

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

  .step-item,
  .relation-steps li {
    padding: 14px 16px 14px 54px;
  }

  .step-item::before,
  .relation-steps li::before {
    left: 14px;
    top: 14px;
    width: 26px;
    height: 26px;
    font-size: 13px;
  }

  .error-code {
    font-size: 44px;
  }
}