:root {
  --canvas: #f4f4f2;
  --card: #ffffff;
  --ink: #1c1c1a;
  --ink-soft: #6b6b65;
  --line: #dcdcd6;
  --line-strong: #c4c4bc;
  --accent: #35664d;
  --accent-soft: #e8efe9;
  --code: #a9622a;
  --code-soft: #f6ece2;
  --radius: 4px;
  --radius-sm: 2px;
  --sans: -apple-system, BlinkMacSystemFont, "Noto Sans SC", "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", sans-serif;
  --mono: "SFMono-Regular", Consolas, Menlo, "Courier New", monospace;
  --shell: 1120px;
  --inner: 1080px;
  --gap: 24px;
}

/* ==========================================================================
   base
   ========================================================================== */

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

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

body.site-body {
  margin: 0;
  padding: 0;
  background-color: var(--canvas);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.85;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

h1,
h2,
h3,
h4,
p,
dl,
dd,
figure,
blockquote {
  margin: 0;
}

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

img {
  display: block;
  max-width: 100%;
  height: auto;
  border: 0;
}

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

a:hover,
a:focus-visible {
  text-decoration: underline;
}

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

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

strong {
  font-weight: 600;
  color: var(--ink);
}

/* ==========================================================================
   layout — 全站骨架
   ========================================================================== */

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

.header-inner {
  max-width: var(--shell);
  margin: 0 auto;
  padding: 14px 24px 0;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px 28px;
}

.brand {
  font-size: 1.15rem;
  font-weight: 600;
  letter-spacing: 0.01em;
  color: var(--ink);
  padding: 6px 0;
}

.brand:hover {
  color: var(--accent);
  text-decoration: none;
}

.nav-toggle {
  display: none;
  margin-left: auto;
  width: 44px;
  height: 44px;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background-color: var(--card);
  position: relative;
}

.nav-toggle::before,
.nav-toggle::after {
  content: "";
  position: absolute;
  left: 12px;
  right: 12px;
  height: 2px;
  background-color: var(--ink);
}

.nav-toggle::before {
  top: 16px;
}

.nav-toggle::after {
  top: 25px;
}

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

.nav-list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 4px 22px;
}

.nav-link {
  display: inline-block;
  padding: 4px 0;
  color: var(--ink);
  font-size: 0.95rem;
  border-bottom: 2px solid transparent;
}

.nav-link:hover {
  color: var(--accent);
  text-decoration: none;
  border-bottom-color: var(--line-strong);
}

.nav-link.is-current {
  color: var(--accent);
  font-weight: 600;
  border-bottom-color: var(--accent);
}

.secondary-nav {
  flex-basis: 100%;
  border-top: 1px solid var(--line);
  margin-top: 10px;
  padding: 8px 0 10px;
}

.tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.tag-link {
  display: inline-block;
  padding: 3px 10px;
  font-size: 0.78rem;
  letter-spacing: 0.04em;
  color: var(--ink-soft);
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background-color: var(--canvas);
}

.tag-link:hover {
  color: var(--accent);
  border-color: var(--accent);
  text-decoration: none;
}

.site-main {
  max-width: var(--shell);
  margin: 0 auto;
  padding: 40px 24px 56px;
}

.inner-main {
  max-width: var(--inner);
}

.breadcrumb {
  margin-bottom: 20px;
  font-family: var(--mono);
  font-size: 0.76rem;
  letter-spacing: 0.04em;
  color: var(--ink-soft);
}

.breadcrumb-list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
}

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

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

.breadcrumb-item::after {
  content: "/";
  margin-left: 8px;
  color: var(--line-strong);
}

.breadcrumb-item:last-child::after {
  content: none;
}

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

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

.page-header {
  margin-bottom: 32px;
}

.page-title {
  font-size: clamp(1.6rem, 4vw, 2.2rem);
  font-weight: 600;
  line-height: 1.4;
  letter-spacing: 0.01em;
  color: var(--ink);
}

.page-title-inner {
  padding: 28px 32px;
  background-color: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.page-title-inner .page-title {
  margin-bottom: 12px;
}

.page-title-inner .page-lead,
.page-title-inner .page-summary {
  max-width: 760px;
  color: var(--ink-soft);
  font-size: 0.95rem;
}

.page-title-inner .meta-row,
.page-title-inner .page-meta {
  margin-top: 18px;
}

.site-brand-heading {
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--ink);
}

.page-kicker {
  font-family: var(--mono);
  font-size: 0.74rem;
  letter-spacing: 0.08em;
  color: var(--code);
  margin-bottom: 8px;
}

.page-lead,
.page-summary {
  color: var(--ink-soft);
  font-size: 0.95rem;
  line-height: 1.8;
}

.meta-row,
.page-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 32px;
  font-family: var(--mono);
  font-size: 0.74rem;
  letter-spacing: 0.04em;
  color: var(--ink-soft);
}

.meta-item {
  display: flex;
  gap: 8px;
}

.meta-item dt,
.page-meta dt {
  color: var(--ink-soft);
}

.meta-item dt::after,
.page-meta dt::after {
  content: "·";
  margin-left: 8px;
  color: var(--line-strong);
}

.meta-item dd,
.page-meta dd {
  margin: 0;
  color: var(--code);
}

.site-footer {
  background-color: var(--card);
  border-top: 1px solid var(--line);
  padding: 44px 24px 0;
}

.footer-inner {
  max-width: var(--shell);
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 28px 32px;
  padding-bottom: 36px;
}

.footer-title {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--ink);
  margin-bottom: 12px;
}

.footer-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.footer-list a {
  color: var(--ink-soft);
  font-size: 0.86rem;
}

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

.footer-note {
  margin-top: 12px;
  font-size: 0.8rem;
  line-height: 1.7;
  color: var(--ink-soft);
}

.footer-bottom {
  max-width: var(--shell);
  margin: 0 auto;
  padding: 18px 0 26px;
  border-top: 1px solid var(--line);
  display: flex;
  flex-wrap: wrap;
  gap: 8px 24px;
  align-items: baseline;
}

.footer-brand {
  font-weight: 600;
  font-size: 0.9rem;
  color: var(--ink);
}

.footer-slogan {
  font-size: 0.82rem;
  color: var(--ink-soft);
}

.back-to-top {
  position: fixed;
  right: 20px;
  bottom: 24px;
  z-index: 50;
  width: 44px;
  height: 44px;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius-sm);
  background-color: var(--card);
  color: var(--ink-soft);
  font-size: 0.72rem;
  letter-spacing: 0.04em;
  opacity: 0;
  visibility: hidden;
  transform: translateY(6px);
  transition: opacity 0.2s ease, transform 0.2s ease, visibility 0.2s;
}

.back-to-top.is-visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.back-to-top:hover {
  color: var(--accent);
  border-color: var(--accent);
}

/* 内页两栏外壳：主内容在前，aside 在后 */
.page-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 288px;
  gap: 40px;
  align-items: start;
}

.sidebar-left .page-layout,
.page-layout.sidebar-left {
  grid-template-columns: 288px minmax(0, 1fr);
}

.sidebar {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

/* ==========================================================================
   components — 通用组件
   ========================================================================== */

.section-head {
  margin-bottom: 24px;
}

.section-head h2,
.section-title,
.guide-steps > h2,
.guide-scenes > h2,
.next-links > h2,
.about-scope > h2,
.about-rules > h2,
.about-limits > h2,
.about-next-steps > h2,
.entry-compare > h2,
.collection-list > h2,
.section-switch > h2,
.section-related > h2,
.updates-intro > h2,
.updates-batches > h2,
.updates-legend > h2 {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--ink);
  line-height: 1.5;
  margin-bottom: 8px;
}

.section-note,
.section-lead,
.section-intro {
  color: var(--ink-soft);
  font-size: 0.92rem;
  max-width: 760px;
}

.section-foot {
  margin-top: 20px;
  font-size: 0.9rem;
}

.text-link {
  font-size: 0.9rem;
  color: var(--accent);
  border-bottom: 1px solid var(--accent-soft);
}

.text-link:hover {
  border-bottom-color: var(--accent);
  text-decoration: none;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 10px 22px;
  border-radius: var(--radius-sm);
  font-size: 0.92rem;
  font-weight: 500;
  border: 1px solid transparent;
}

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

.btn-primary:hover {
  background-color: #2c5541;
  text-decoration: none;
}

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

.btn-ghost:hover {
  color: var(--accent);
  border-color: var(--accent);
  text-decoration: none;
}

.tag {
  display: inline-block;
  padding: 2px 8px;
  font-size: 0.72rem;
  letter-spacing: 0.04em;
  color: var(--accent);
  border: 1px solid var(--accent);
  border-radius: var(--radius-sm);
  background-color: var(--accent-soft);
}

.tag-chip {
  display: inline-block;
  padding: 2px 8px;
  font-size: 0.72rem;
  color: var(--ink-soft);
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background-color: var(--canvas);
}

figure {
  margin: 0;
}

figure img {
  width: 100%;
  object-fit: cover;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background-color: var(--canvas);
}

figcaption {
  margin-top: 10px;
  font-size: 0.78rem;
  line-height: 1.7;
  color: var(--ink-soft);
}

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

.side-title {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--ink);
  margin-bottom: 10px;
}

.side-text {
  font-size: 0.86rem;
  line-height: 1.8;
  color: var(--ink-soft);
}

.side-text + .side-text {
  margin-top: 10px;
}

.side-tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 12px;
}

.side-tag {
  display: inline-block;
  padding: 3px 9px;
  font-size: 0.74rem;
  color: var(--ink-soft);
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
}

.side-tag:hover {
  color: var(--accent);
  border-color: var(--accent);
  text-decoration: none;
}

.side-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-top: 12px;
}

.side-item {
  font-size: 0.86rem;
  line-height: 1.75;
  color: var(--ink-soft);
}

.side-link {
  color: var(--accent);
  font-size: 0.86rem;
}

.related-links {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 18px;
  margin-top: 36px;
  padding: 16px 20px;
  background-color: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.related-links-label {
  font-family: var(--mono);
  font-size: 0.74rem;
  letter-spacing: 0.06em;
  color: var(--ink-soft);
}

.related-links-item {
  font-size: 0.86rem;
}

.next-bar,
.next-strip,
.next-links,
.next-section {
  margin-top: 44px;
  padding: 24px 26px;
  background-color: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.next-title {
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--ink);
  margin-bottom: 16px;
}

.next-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 16px;
}

.next-item a {
  display: block;
  font-size: 0.92rem;
  font-weight: 500;
  color: var(--accent);
  margin-bottom: 4px;
}

.next-name {
  display: inline-block;
  margin-right: 8px;
}

.next-why,
.next-text,
.next-desc {
  font-size: 0.84rem;
  line-height: 1.75;
  color: var(--ink-soft);
}

.next-link {
  font-size: 0.92rem;
  font-weight: 500;
  color: var(--accent);
}

.next-inner {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 16px;
}

/* ==========================================================================
   pages — 首页
   ========================================================================== */

.home-main {
  max-width: var(--shell);
}

.hero {
  margin-bottom: 56px;
}

.hero-inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1.05fr);
  gap: 40px;
  align-items: center;
  padding: 36px 0 0;
}

.hero-text {
  max-width: 520px;
}

.hero-kicker {
  font-family: var(--mono);
  font-size: 0.74rem;
  letter-spacing: 0.08em;
  color: var(--code);
  margin-bottom: 12px;
}

.hero-text h1 {
  font-size: clamp(1.6rem, 4vw, 2.2rem);
  font-weight: 600;
  line-height: 1.4;
  letter-spacing: 0.01em;
  color: var(--ink);
  margin-bottom: 16px;
}

.hero-lead {
  font-size: 0.98rem;
  line-height: 1.85;
  color: var(--ink-soft);
  margin-bottom: 24px;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 28px;
}

.hero-facts {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
  padding-top: 20px;
  border-top: 1px solid var(--line);
}

.fact dt {
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.06em;
  color: var(--ink-soft);
  margin-bottom: 4px;
}

.fact dd {
  margin: 0;
  font-size: 0.88rem;
  color: var(--ink);
}

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

.lines,
.genres,
.collections,
.archive,
.updates,
.guide,
.faq {
  padding: 40px 0;
  border-top: 1px solid var(--line);
}

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

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

.line-index {
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  color: var(--code);
  margin-bottom: 8px;
}

.line-card h3 {
  font-size: 1rem;
  font-weight: 600;
  color: var(--ink);
  margin-bottom: 8px;
}

.line-card p {
  font-size: 0.88rem;
  line-height: 1.8;
  color: var(--ink-soft);
  margin-bottom: 12px;
}

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

.genre-cell {
  display: block;
  padding: 18px 20px 20px;
  background-color: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  color: inherit;
}

.genre-cell:hover {
  border-color: var(--line-strong);
  text-decoration: none;
  transform: translateY(-2px);
}

.genre-cell h3 {
  font-size: 1rem;
  font-weight: 600;
  color: var(--ink);
  margin-bottom: 6px;
}

.genre-cell p {
  font-size: 0.84rem;
  line-height: 1.75;
  color: var(--ink-soft);
  margin-bottom: 14px;
}

.genre-cell img {
  width: 100%;
  aspect-ratio: 4 / 5;
  object-fit: cover;
}

.collection-list {
  display: flex;
  flex-direction: column;
  gap: 0;
  border-top: 1px solid var(--line);
}

.collection-row {
  display: grid;
  grid-template-columns: 240px minmax(0, 1fr);
  gap: 24px;
  padding: 22px 0;
  border-bottom: 1px solid var(--line);
}

.collection-key {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.collection-no {
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  color: var(--code);
}

.collection-key h3 {
  font-size: 1rem;
  font-weight: 600;
  color: var(--ink);
}

.collection-body p {
  font-size: 0.88rem;
  line-height: 1.8;
  color: var(--ink-soft);
}

.collection-meta {
  margin-top: 10px;
  font-family: var(--mono);
  font-size: 0.74rem;
  letter-spacing: 0.04em;
  color: var(--code);
}

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

.archive-card {
  display: flex;
  flex-direction: column;
  padding: 22px 24px;
  background-color: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

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

.archive-no {
  font-family: var(--mono);
  font-size: 0.74rem;
  letter-spacing: 0.08em;
  color: var(--code);
  margin-bottom: 8px;
}

.archive-card h3 {
  font-size: 1rem;
  font-weight: 600;
  color: var(--ink);
  margin-bottom: 10px;
}

.archive-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 12px;
}

.archive-summary {
  font-size: 0.86rem;
  line-height: 1.8;
  color: var(--ink-soft);
  margin-bottom: 14px;
}

.archive-progress {
  font-family: var(--mono);
  font-size: 0.74rem;
  letter-spacing: 0.04em;
  color: var(--ink-soft);
  padding: 8px 10px;
  background-color: var(--canvas);
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  margin-bottom: 14px;
}

.archive-card .text-link {
  margin-top: auto;
}

.update-timeline {
  display: flex;
  flex-direction: column;
  border-top: 1px solid var(--line);
}

.update-row {
  display: grid;
  grid-template-columns: 130px 96px 120px minmax(0, 1fr);
  gap: 16px;
  align-items: baseline;
  padding: 16px 0;
  border-bottom: 1px solid var(--line);
}

.update-batch {
  font-family: var(--mono);
  font-size: 0.74rem;
  letter-spacing: 0.06em;
  color: var(--code);
}

.update-type {
  display: inline-block;
  padding: 2px 8px;
  font-size: 0.72rem;
  color: var(--ink-soft);
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background-color: var(--card);
  justify-self: start;
}

.update-ref {
  font-family: var(--mono);
  font-size: 0.74rem;
  letter-spacing: 0.04em;
  color: var(--ink-soft);
}

.update-note {
  font-size: 0.86rem;
  line-height: 1.8;
  color: var(--ink-soft);
}

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

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

.step-no {
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  color: var(--code);
  margin-bottom: 8px;
}

.step h3 {
  font-size: 1rem;
  font-weight: 600;
  color: var(--ink);
  margin-bottom: 8px;
}

.step p {
  font-size: 0.86rem;
  line-height: 1.8;
  color: var(--ink-soft);
}

.faq-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.faq-item {
  background-color: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 4px 20px;
}

.faq-item summary {
  padding: 14px 0;
  font-size: 0.94rem;
  font-weight: 500;
  color: var(--ink);
  cursor: pointer;
  list-style: none;
}

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

.faq-item summary::after {
  content: "+";
  float: right;
  font-family: var(--mono);
  color: var(--accent);
}

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

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

.faq-item > p,
.faq-answer {
  padding-bottom: 16px;
  font-size: 0.88rem;
  line-height: 1.85;
  color: var(--ink-soft);
}

.faq-answer p + p {
  margin-top: 10px;
}

.faq-links {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 18px;
  margin-top: 12px;
}

.faq-links a {
  font-size: 0.84rem;
}

.next {
  padding: 40px 0 0;
  border-top: 1px solid var(--line);
}

/* ==========================================================================
   pages — 内页栏目
   ========================================================================== */

/* 题材索引 */
.path-section {
  margin-top: 40px;
  padding-top: 32px;
  border-top: 1px solid var(--line);
}

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

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

.path-no {
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  color: var(--code);
  margin-bottom: 6px;
}

.path-title {
  font-size: 0.98rem;
  font-weight: 600;
  color: var(--ink);
  margin-bottom: 8px;
}

.path-text {
  font-size: 0.86rem;
  line-height: 1.8;
  color: var(--ink-soft);
}

.genre-group {
  padding: 32px 0;
  border-top: 1px solid var(--line);
}

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

.group-head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 8px 16px;
  margin-bottom: 16px;
}

.group-title {
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--ink);
}

.group-count {
  font-family: var(--mono);
  font-size: 0.74rem;
  letter-spacing: 0.04em;
  color: var(--ink-soft);
}

.group-figure {
  margin-bottom: 18px;
}

.group-figure img {
  width: 100%;
  aspect-ratio: 16 / 7;
  object-fit: cover;
}

.group-body {
  margin-bottom: 20px;
}

.group-text {
  font-size: 0.9rem;
  line-height: 1.85;
  color: var(--ink-soft);
}

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

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

.entry-card {
  display: flex;
}

.entry-link {
  display: flex;
  flex-direction: column;
  width: 100%;
  padding: 18px 20px;
  background-color: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  color: inherit;
}

.entry-link:hover {
  border-color: var(--line-strong);
  transform: translateY(-2px);
  text-decoration: none;
}

.entry-no {
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.06em;
  color: var(--code);
  margin-bottom: 6px;
}

.entry-name {
  font-size: 0.96rem;
  font-weight: 600;
  color: var(--ink);
  margin-bottom: 8px;
}

.entry-tags {
  font-size: 0.74rem;
  letter-spacing: 0.04em;
  color: var(--accent);
  margin-bottom: 8px;
}

.entry-summary {
  font-size: 0.84rem;
  line-height: 1.8;
  color: var(--ink-soft);
}

/* 精选合集 */
.section-intro p {
  font-size: 0.92rem;
  line-height: 1.85;
  color: var(--ink-soft);
}

.section-intro p + p {
  margin-top: 12px;
}

.collection-list > h2 {
  margin-bottom: 8px;
}

.collection-block {
  display: grid;
  grid-template-columns: 220px minmax(0, 1fr);
  gap: 28px;
  padding: 28px 0;
  border-top: 1px solid var(--line);
}

.collection-head {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.collection-index {
  font-family: var(--mono);
  font-size: 0.74rem;
  letter-spacing: 0.08em;
  color: var(--code);
}

.collection-theme {
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--ink);
  line-height: 1.5;
}

.collection-reason {
  font-size: 0.9rem;
  line-height: 1.85;
  color: var(--ink-soft);
  margin-bottom: 16px;
}

.collection-items {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 16px 18px;
  background-color: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.collection-item {
  display: grid;
  grid-template-columns: 92px minmax(0, 1fr);
  gap: 6px 14px;
  align-items: baseline;
  font-size: 0.86rem;
}

.item-code {
  font-family: var(--mono);
  font-size: 0.74rem;
  letter-spacing: 0.04em;
  color: var(--code);
}

.item-link {
  font-weight: 500;
}

.item-why {
  grid-column: 2 / 3;
  font-size: 0.82rem;
  line-height: 1.75;
  color: var(--ink-soft);
}

.collection-diff {
  margin-top: 14px;
  padding-left: 14px;
  border-left: 2px solid var(--line-strong);
  font-size: 0.86rem;
  line-height: 1.8;
  color: var(--ink-soft);
}

.section-switch,
.section-related {
  margin-top: 40px;
  padding-top: 32px;
  border-top: 1px solid var(--line);
}

.section-switch p {
  font-size: 0.9rem;
  line-height: 1.85;
  color: var(--ink-soft);
}

.section-switch p + p {
  margin-top: 12px;
}

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

.related-item {
  padding: 16px 18px;
  background-color: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  font-size: 0.88rem;
}

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

.related-figure img {
  width: 100%;
  aspect-ratio: 16 / 6;
  object-fit: cover;
}

/* 作品档案 */
.archive-entry {
  padding: 32px 0;
  border-top: 1px solid var(--line);
}

.archive-entry:first-of-type {
  border-top: 0;
  padding-top: 0;
}

.entry-head {
  margin-bottom: 18px;
}

.entry-code {
  font-family: var(--mono);
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  color: var(--code);
  margin-bottom: 8px;
}

.entry-title {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--ink);
  line-height: 1.5;
  margin-bottom: 12px;
}

.tag-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.genre-tag {
  display: inline-block;
  padding: 2px 9px;
  font-size: 0.72rem;
  letter-spacing: 0.04em;
  color: var(--accent);
  border: 1px solid var(--accent);
  border-radius: var(--radius-sm);
  background-color: var(--accent-soft);
}

.entry-media {
  margin-bottom: 22px;
}

.entry-media img {
  width: 100%;
  aspect-ratio: 16 / 8;
  object-fit: cover;
}

.entry-block {
  margin-bottom: 20px;
}

.entry-block h3 {
  font-size: 0.98rem;
  font-weight: 600;
  color: var(--ink);
  margin-bottom: 8px;
}

.entry-block p {
  font-size: 0.9rem;
  line-height: 1.85;
  color: var(--ink-soft);
}

.point-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-top: 8px;
}

.point-list li {
  position: relative;
  padding-left: 16px;
  font-size: 0.88rem;
  line-height: 1.8;
  color: var(--ink-soft);
}

.point-list li::before {
  content: "—";
  position: absolute;
  left: 0;
  color: var(--line-strong);
}

.progress-band {
  margin-top: 12px;
  padding: 16px 18px;
  background-color: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.progress-track {
  display: flex;
  gap: 4px;
  margin-bottom: 10px;
}

.progress-seg {
  flex: 1;
  height: 6px;
  border-radius: 1px;
  background-color: var(--line);
}

.progress-seg.is-done {
  background-color: var(--accent);
}

.progress-seg.is-pending {
  background-color: var(--line-strong);
}

.progress-note {
  font-family: var(--mono);
  font-size: 0.74rem;
  letter-spacing: 0.04em;
  color: var(--ink-soft);
}

.entry-notice {
  padding: 16px 18px;
  background-color: var(--code-soft);
  border: 1px solid #e6d3c0;
  border-radius: var(--radius);
}

.entry-related {
  padding-top: 16px;
  border-top: 1px solid var(--line);
}

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

.related-card {
  background-color: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 14px 16px;
}

.related-card a {
  display: block;
  color: inherit;
}

.related-card a:hover {
  text-decoration: none;
  color: var(--accent);
}

.related-code {
  display: block;
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.06em;
  color: var(--code);
  margin-bottom: 4px;
}

.related-title {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--ink);
  margin-bottom: 4px;
}

.related-reason {
  font-size: 0.82rem;
  line-height: 1.75;
  color: var(--ink-soft);
}

.entry-compare {
  margin-top: 36px;
  padding-top: 28px;
  border-top: 1px solid var(--line);
}

.entry-compare > p {
  font-size: 0.9rem;
  line-height: 1.85;
  color: var(--ink-soft);
  margin-bottom: 18px;
}

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

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

.compare-item h3 {
  font-size: 0.94rem;
  font-weight: 600;
  color: var(--ink);
  margin-bottom: 8px;
}

.compare-item p {
  font-size: 0.84rem;
  line-height: 1.8;
  color: var(--ink-soft);
}

.compare-link {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 20px;
  margin-top: 18px;
  font-size: 0.86rem;
}

/* 更新记录 */
.updates-intro,
.updates-batches,
.updates-legend {
  padding: 32px 0;
  border-top: 1px solid var(--line);
}

.updates-intro {
  border-top: 0;
  padding-top: 0;
}

.updates-figure {
  margin-top: 20px;
}

.updates-figure img {
  width: 100%;
  aspect-ratio: 16 / 6;
  object-fit: cover;
}

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

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

.batch-head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 8px 16px;
  margin-bottom: 14px;
}

.batch-code {
  font-family: var(--mono);
  font-size: 0.82rem;
  letter-spacing: 0.08em;
  color: var(--code);
}

.batch-desc {
  font-size: 0.86rem;
  color: var(--ink-soft);
}

.change-list {
  display: flex;
  flex-direction: column;
  border-top: 1px solid var(--line);
}

.change-row {
  display: grid;
  grid-template-columns: 96px 120px minmax(0, 1fr);
  gap: 16px;
  align-items: baseline;
  padding: 12px 0;
  border-bottom: 1px solid var(--line);
}

.change-type {
  display: inline-block;
  padding: 2px 9px;
  font-size: 0.72rem;
  letter-spacing: 0.04em;
  border-radius: var(--radius-sm);
  border: 1px solid var(--line);
  color: var(--ink-soft);
  background-color: var(--card);
  justify-self: start;
}

.change-type.is-new {
  color: var(--accent);
  border-color: var(--accent);
  background-color: var(--accent-soft);
}

.change-type.is-fill {
  color: var(--code);
  border-color: #d9b48c;
  background-color: var(--code-soft);
}

.change-type.is-revise {
  color: var(--ink-soft);
  border-color: var(--line-strong);
  background-color: var(--canvas);
}

.change-type.is-adjust {
  color: #4b5a86;
  border-color: #b6bfd6;
  background-color: #eef1f7;
}

.change-code {
  font-family: var(--mono);
  font-size: 0.74rem;
  letter-spacing: 0.04em;
  color: var(--ink-soft);
}

.change-text {
  font-size: 0.86rem;
  line-height: 1.8;
  color: var(--ink-soft);
}

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

.legend-item {
  padding: 16px 18px;
  background-color: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.legend-text {
  margin-top: 8px;
  font-size: 0.84rem;
  line-height: 1.8;
  color: var(--ink-soft);
}

.legend-note {
  margin-top: 16px;
  font-size: 0.86rem;
  line-height: 1.8;
  color: var(--ink-soft);
}

/* 阅读指南 */
.guide-figure {
  margin-bottom: 32px;
}

.figure-block img {
  width: 100%;
  aspect-ratio: 16 / 7;
  object-fit: cover;
}

.figure-caption {
  margin-top: 10px;
  font-size: 0.78rem;
  line-height: 1.7;
  color: var(--ink-soft);
}

.guide-steps,
.guide-scenes {
  padding: 32px 0;
  border-top: 1px solid var(--line);
}

.guide-steps {
  border-top: 0;
  padding-top: 0;
}

.step-block {
  display: grid;
  grid-template-columns: 72px minmax(0, 1fr);
  gap: 24px;
  padding: 24px 0;
  border-top: 1px solid var(--line);
}

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

.step-index {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.step-number {
  font-family: var(--mono);
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  color: var(--code);
}

.step-name {
  font-size: 1rem;
  font-weight: 600;
  color: var(--ink);
  line-height: 1.5;
}

.step-body p {
  font-size: 0.9rem;
  line-height: 1.85;
  color: var(--ink-soft);
}

.step-body p + p {
  margin-top: 10px;
}

.step-basis,
.step-pitfall {
  padding-left: 14px;
  border-left: 2px solid var(--line);
}

.step-basis strong,
.step-pitfall strong {
  color: var(--ink);
  margin-right: 6px;
}

.scene-item {
  padding: 20px 22px;
  margin-top: 16px;
  background-color: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.scene-item h3 {
  font-size: 0.98rem;
  font-weight: 600;
  color: var(--ink);
  margin-bottom: 8px;
}

.scene-item p {
  font-size: 0.88rem;
  line-height: 1.85;
  color: var(--ink-soft);
}

.scene-order {
  margin-top: 10px;
  padding-top: 10px;
  border-top: 1px dashed var(--line);
}

.scene-order strong {
  margin-right: 6px;
}

.next-links .next-list {
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
}

/* 常见问答 */
.faq-group {
  padding: 32px 0;
  border-top: 1px solid var(--line);
}

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

.faq-group h2 {
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--ink);
  margin-bottom: 6px;
}

.group-note {
  font-size: 0.88rem;
  color: var(--ink-soft);
  margin-bottom: 18px;
}

.faq-figure {
  margin: 0 0 20px;
}

.faq-figure img {
  width: 100%;
  aspect-ratio: 16 / 6;
  object-fit: cover;
}

/* 站点说明 */
.about-intro {
  margin-bottom: 32px;
}

.about-intro p {
  font-size: 0.94rem;
  line-height: 1.9;
  color: var(--ink-soft);
}

.about-intro p + p {
  margin-top: 14px;
}

.about-scope,
.about-rules,
.about-limits {
  padding: 32px 0;
  border-top: 1px solid var(--line);
}

.scope-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
  margin-top: 18px;
}

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

.scope-item h3 {
  font-size: 0.94rem;
  font-weight: 600;
  color: var(--ink);
  margin-bottom: 8px;
}

.scope-item p {
  font-size: 0.85rem;
  line-height: 1.8;
  color: var(--ink-soft);
}

.rules-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
  margin-top: 18px;
  counter-reset: rule;
}

.rule-item {
  position: relative;
  padding: 18px 20px 18px 56px;
  background-color: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  counter-increment: rule;
}

.rule-item::before {
  content: counter(rule, decimal-leading-zero);
  position: absolute;
  left: 20px;
  top: 18px;
  font-family: var(--mono);
  font-size: 0.78rem;
  letter-spacing: 0.06em;
  color: var(--code);
}

.rule-item h3 {
  font-size: 0.94rem;
  font-weight: 600;
  color: var(--ink);
  margin-bottom: 8px;
}

.rule-item p {
  font-size: 0.85rem;
  line-height: 1.8;
  color: var(--ink-soft);
}

.limits-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
  margin-top: 18px;
}

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

.limit-item h3 {
  font-size: 0.94rem;
  font-weight: 600;
  color: var(--ink);
  margin-bottom: 8px;
}

.limit-item p {
  font-size: 0.85rem;
  line-height: 1.8;
  color: var(--ink-soft);
}

.about-figure {
  margin-top: 32px;
}

.about-figure img {
  width: 100%;
  aspect-ratio: 16 / 6;
  object-fit: cover;
}

.about-next-steps {
  margin-top: 32px;
  padding-top: 28px;
  border-top: 1px solid var(--line);
}

.about-next-steps p {
  font-size: 0.9rem;
  line-height: 1.85;
  color: var(--ink-soft);
  margin-bottom: 16px;
}

.about-links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 24px;
}

.about-links a {
  font-size: 0.88rem;
}

/* 404 */
.error-main {
  max-width: 720px;
  padding-top: 72px;
  padding-bottom: 96px;
}

.error-panel {
  padding: 40px 36px;
  background-color: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.error-code {
  font-family: var(--mono);
  font-size: 0.78rem;
  letter-spacing: 0.1em;
  color: var(--code);
  margin-bottom: 12px;
}

.error-title {
  font-size: clamp(1.6rem, 4vw, 2.2rem);
  font-weight: 600;
  line-height: 1.4;
  color: var(--ink);
  margin-bottom: 14px;
}

.error-text {
  font-size: 0.92rem;
  line-height: 1.85;
  color: var(--ink-soft);
}

.error-text + .error-text {
  margin-top: 10px;
}

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

/* ==========================================================================
   responsive
   ========================================================================== */

@media (max-width: 1024px) {
  .page-layout,
  .sidebar-left .page-layout,
  .page-layout.sidebar-left {
    grid-template-columns: minmax(0, 1fr);
    gap: 32px;
  }

  .sidebar {
    flex-direction: row;
    flex-wrap: wrap;
  }

  .side-card {
    flex: 1 1 260px;
  }

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

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

  .archive-grid,
  .step-grid,
  .entry-cards,
  .path-list,
  .compare-list,
  .related-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

  .update-row {
    grid-template-columns: 120px 88px minmax(0, 1fr);
  }

  .update-note {
    grid-column: 1 / -1;
  }

  .collection-block {
    grid-template-columns: 180px minmax(0, 1fr);
    gap: 22px;
  }
}

@media (max-width: 768px) {
  .header-inner {
    padding: 12px 18px 0;
    align-items: center;
  }

  .nav-toggle {
    display: block;
  }

  .primary-nav {
    flex-basis: 100%;
    margin-left: 0;
    order: 3;
  }

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

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

  .nav-link {
    display: block;
    min-height: 48px;
    padding: 12px 2px;
    border-bottom: 1px solid var(--line);
  }

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

  .secondary-nav {
    order: 4;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
  }

  .tag-list {
    flex-wrap: nowrap;
    gap: 8px;
    padding-bottom: 4px;
  }

  .tag-link {
    white-space: nowrap;
    min-height: 32px;
    display: inline-flex;
    align-items: center;
  }

  .site-main {
    padding: 28px 18px 44px;
  }

  .page-title-inner {
    padding: 22px 20px;
  }

  .footer-inner {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 24px;
  }

  .genre-grid,
  .archive-grid,
  .step-grid,
  .entry-cards,
  .path-list,
  .compare-list,
  .related-list,
  .scope-list,
  .limits-list,
  .legend-grid {
    grid-template-columns: minmax(0, 1fr);
  }

  .collection-row,
  .collection-block {
    grid-template-columns: minmax(0, 1fr);
    gap: 14px;
  }

  .collection-key,
  .collection-head {
    flex-direction: row;
    align-items: baseline;
    gap: 12px;
  }

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

  .update-note,
  .change-text {
    grid-column: auto;
  }

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

  .step-index {
    flex-direction: row;
    align-items: baseline;
    gap: 12px;
  }

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

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

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

  .item-why {
    grid-column: auto;
  }

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

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

@media (max-width: 480px) {
  body.site-body {
    font-size: 15px;
  }

  .header-inner {
    padding: 10px 14px 0;
  }

  .site-main {
    padding: 22px 14px 40px;
  }

  .site-footer {
    padding: 32px 14px 0;
  }

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

  .page-title-inner,
  .error-panel {
    padding: 20px 16px;
  }

  .side-card,
  .line-card,
  .archive-card,
  .step,
  .scope-item,
  .limit-item,
  .rule-item,
  .scene-item {
    padding: 16px 16px;
  }

  .rule-item {
    padding-left: 48px;
  }

  .genre-cell {
    padding: 16px 16px 18px;
  }

  .next-bar,
  .next-strip,
  .next-links,
  .next-section {
    padding: 20px 16px;
  }

  .back-to-top {
    right: 14px;
    bottom: 16px;
  }
}

/* 程序验收反馈：修复网格孤项 */
@media (min-width: 769px) {
  .line-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}