:root {
  --color-primary: #1f3a5f;
  --color-secondary: #4a6b82;
  --color-bg: #f4f6f8;
  --color-card: #ffffff;
  --color-border: #e2e6ea;
  --color-border-strong: #c8d0d8;
  --color-accent: #c96a2b;
  --color-text: #232a31;
  --color-muted: #6b7680;
  --color-tag-bg: #eef2f5;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  --font-mono: "SF Mono", "Consolas", "Menlo", "Courier New", monospace;
  --radius: 4px;
  --radius-sm: 3px;
  --container: 1120px;
  --content-narrow: 760px;
  --space-section: 48px;
  --shadow-hover: 0 4px 14px rgba(31, 58, 95, 0.08);
}

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

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

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

body {
  margin: 0;
  background: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-sans);
  font-size: 15px;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
}

h1,
h2,
h3,
h4,
h5,
h6 {
  margin: 0;
  font-weight: 600;
  line-height: 1.35;
  color: var(--color-primary);
}

p {
  margin: 0 0 12px;
}

p:last-child {
  margin-bottom: 0;
}

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

a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color 150ms ease, border-color 150ms ease;
}

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

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

figure {
  margin: 0;
}

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

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;
}

/* ============ layout: shell skeleton ============ */

.site-body {
  font-family: var(--font-sans);
  font-size: 15px;
  line-height: 1.75;
  color: var(--color-text);
  background: var(--color-bg);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.site-header {
  background: var(--color-card);
  border-bottom: 1px solid var(--color-border);
  position: sticky;
  top: 0;
  z-index: 50;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  max-width: var(--container);
  margin: 0 auto;
  width: 100%;
  padding: 12px 20px;
}

.site-header .brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--color-primary);
  font-weight: 600;
  flex-shrink: 0;
}

.site-header .brand-mark {
  display: inline-block;
  width: 22px;
  height: 22px;
  border-radius: var(--radius-sm);
  background: var(--color-primary);
  position: relative;
}

.site-header .brand-mark::after {
  content: "";
  position: absolute;
  inset: 5px;
  border: 2px solid #ffffff;
  border-radius: 2px;
}

.site-header .brand-name {
  font-size: 17px;
  letter-spacing: 0;
}

.site-nav {
  display: flex;
  align-items: center;
  min-width: 0;
}

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

.nav-list li a {
  display: inline-block;
  padding: 8px 12px;
  font-size: 14px;
  color: var(--color-secondary);
  border-bottom: 2px solid transparent;
  line-height: 1.5;
}

.nav-list li a:hover {
  color: var(--color-primary);
}

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

.nav-toggle {
  display: none;
  background: none;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 8px 10px;
  width: 44px;
  height: 44px;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 4px;
  flex-shrink: 0;
}

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

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

.home-main,
.inner-main {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 20px 60px;
  width: 100%;
}

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

/* ============ layout: shared section ============ */

.section {
  margin-top: var(--space-section);
}

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

.section-title {
  font-size: 22px;
  margin-bottom: 8px;
}

.section-desc,
.section-intro,
.section-lead {
  color: var(--color-muted);
  font-size: 14px;
  max-width: var(--content-narrow);
}

.section-intro,
.section-lead {
  margin-bottom: 20px;
}

.subsection-title {
  font-size: 17px;
  margin-bottom: 10px;
}

/* ============ components: buttons & tags ============ */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 10px 18px;
  border-radius: var(--radius);
  font-size: 14px;
  font-weight: 500;
  border: 1px solid transparent;
  line-height: 1.4;
  min-height: 44px;
  transition: background-color 150ms ease, border-color 150ms ease,
    color 150ms ease, transform 150ms ease;
}

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

.btn-primary:hover {
  background: #162c48;
  color: #ffffff;
}

.btn-secondary {
  background: var(--color-card);
  color: var(--color-primary);
  border-color: var(--color-border-strong);
}

.btn-secondary:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
}

.btn-ghost {
  background: transparent;
  color: var(--color-secondary);
  border-color: transparent;
  padding-left: 4px;
  padding-right: 4px;
}

.btn-ghost:hover {
  color: var(--color-primary);
}

.tag {
  display: inline-block;
  padding: 2px 8px;
  font-size: 12px;
  line-height: 1.6;
  color: var(--color-secondary);
  background: var(--color-tag-bg);
  border-radius: var(--radius-sm);
  white-space: nowrap;
}

.tag-label {
  font-size: 13px;
  color: var(--color-muted);
  margin-right: 6px;
}

.tag-genre,
.tag-state,
.tag-new,
.tag-update {
  display: inline-block;
  padding: 2px 8px;
  font-size: 12px;
  line-height: 1.6;
  border-radius: var(--radius-sm);
  white-space: nowrap;
}

.tag-genre {
  color: var(--color-secondary);
  background: var(--color-tag-bg);
}

.tag-state {
  color: var(--color-secondary);
  background: var(--color-tag-bg);
  border: 1px solid var(--color-border);
}

.tag-new {
  color: #ffffff;
  background: var(--color-accent);
}

.tag-update {
  color: var(--color-accent);
  background: #fbf1e8;
}

/* ============ components: breadcrumb & page header ============ */

.breadcrumb {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 6px;
  font-size: 13px;
  color: var(--color-muted);
  padding: 16px 0 0;
}

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

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

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

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

.page-header {
  padding: 18px 0 24px;
  border-bottom: 1px solid var(--color-border);
  margin-bottom: 32px;
}

.page-title {
  font-size: 34px;
  font-weight: 600;
  color: var(--color-primary);
  margin-bottom: 10px;
}

.page-description {
  font-size: 15px;
  color: var(--color-muted);
  max-width: var(--content-narrow);
  margin-bottom: 10px;
}

.page-status {
  display: inline-block;
  font-size: 13px;
  color: var(--color-secondary);
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: 4px 10px;
  font-family: var(--font-mono);
}

/* ============ components: figures & media ============ */

.media-figure,
.section-media,
.genre-group-media,
.path-figure,
.updates-batch,
.hero-visual {
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  overflow: hidden;
}

.media-figure img,
.section-media img,
.genre-group-media img,
.path-figure img,
.updates-batch img {
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  background: var(--color-tag-bg);
}

.media-caption,
.updates-batch-caption {
  display: block;
  padding: 10px 14px;
  font-size: 13px;
  color: var(--color-muted);
  border-top: 1px solid var(--color-border);
}

.media-section .media-figure {
  margin-top: 4px;
}

/* ============ components: site index ============ */

.site-index {
  margin-top: var(--space-section);
  padding: 24px;
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
}

.site-index .section-title {
  margin-bottom: 16px;
}

.index-grid,
.site-index-list,
.index-list {
  display: grid;
  grid-template-columns: repeat(6, minmax(0, 1fr));
  gap: 12px;
}

.index-cell,
.site-index-item,
.index-item {
  display: block;
}

.index-cell a,
.site-index-item a,
.index-item a {
  display: block;
  padding: 10px 12px;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  font-size: 14px;
  color: var(--color-primary);
  transition: border-color 150ms ease, transform 150ms ease,
    box-shadow 150ms ease;
}

.index-cell a:hover,
.site-index-item a:hover,
.index-item a:hover {
  border-color: var(--color-primary);
  transform: translateY(-2px);
  box-shadow: var(--shadow-hover);
  color: var(--color-primary);
}

.index-note,
.site-index-desc {
  display: block;
  margin-top: 6px;
  font-size: 12px;
  color: var(--color-muted);
  padding: 0 2px;
}

/* ============ components: plain list ============ */

.plain-list li {
  position: relative;
  padding-left: 16px;
  margin-bottom: 8px;
  color: var(--color-text);
  font-size: 14px;
}

.plain-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 11px;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--color-secondary);
}

/* ============ components: footer ============ */

.site-footer {
  background: var(--color-card);
  border-top: 1px solid var(--color-border);
  margin-top: auto;
  width: 100%;
}

.footer-grid {
  max-width: var(--container);
  margin: 0 auto;
  padding: 40px 20px 24px;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 32px;
}

.footer-title {
  font-size: 15px;
  font-weight: 600;
  color: var(--color-primary);
  margin-bottom: 12px;
}

.footer-text {
  font-size: 13px;
  color: var(--color-muted);
  margin-bottom: 12px;
}

.footer-links li {
  margin-bottom: 8px;
}

.footer-links li a {
  font-size: 13px;
  color: var(--color-secondary);
}

.footer-links li a:hover {
  color: var(--color-primary);
}

.footer-bottom {
  max-width: var(--container);
  margin: 0 auto;
  padding: 16px 20px 28px;
  border-top: 1px solid var(--color-border);
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 8px 16px;
}

.footer-boundary,
.footer-copy {
  font-size: 12px;
  color: var(--color-muted);
  margin: 0;
}

/* ============ pages: index ============ */

.fact-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 8px 20px;
  background: var(--color-primary);
  color: #e8eef4;
  padding: 8px calc((100% - var(--container)) / 2 + 20px);
}

.fact-bar-text {
  font-size: 13px;
  margin: 0;
}

.fact-bar-links {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
}

.fact-bar-links a {
  color: #ffffff;
  font-size: 13px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.4);
  padding-bottom: 1px;
}

.fact-bar-links a:hover {
  color: #ffffff;
  border-bottom-color: #ffffff;
}

/* hero workbench */

.hero-workbench {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: 32px;
  padding: 40px 0 8px;
  align-items: start;
}

.hero-copy {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.hero-title {
  font-size: 34px;
  font-weight: 600;
  color: var(--color-primary);
  line-height: 1.3;
}

.hero-summary {
  font-size: 15px;
  color: var(--color-text);
  max-width: 560px;
}

.hero-note {
  font-size: 13px;
  color: var(--color-muted);
  padding: 10px 12px;
  background: var(--color-card);
  border-left: 3px solid var(--color-secondary);
  border-radius: 0 var(--radius) var(--radius) 0;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 4px;
}

.hero-visual img {
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  background: var(--color-tag-bg);
}

.hero-caption {
  display: block;
  padding: 10px 14px;
  font-size: 13px;
  color: var(--color-muted);
  border-top: 1px solid var(--color-border);
}

.hero-tags {
  grid-column: 1 / -1;
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 4px;
  padding-top: 16px;
  border-top: 1px solid var(--color-border);
}

.hero-tags .tag {
  transition: background-color 150ms ease, color 150ms ease,
    border-color 150ms ease;
  border: 1px solid var(--color-border);
}

.hero-tags .tag:hover {
  background: var(--color-primary);
  color: #ffffff;
  border-color: var(--color-primary);
}

/* genre overview */

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

.genre-cell {
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 18px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  transition: border-color 150ms ease, transform 150ms ease,
    box-shadow 150ms ease;
}

.genre-cell:hover {
  border-color: var(--color-primary);
  transform: translateY(-2px);
  box-shadow: var(--shadow-hover);
}

.genre-index {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--color-accent);
  font-weight: 600;
}

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

.genre-trait {
  font-size: 13px;
  color: var(--color-muted);
  margin: 0;
}

.genre-samples {
  margin-top: 4px;
  border-top: 1px dashed var(--color-border);
  padding-top: 8px;
}

.genre-samples li {
  margin-bottom: 4px;
}

.genre-samples li a {
  font-size: 13px;
  color: var(--color-secondary);
}

.genre-samples li a:hover {
  color: var(--color-accent);
}

/* split sections */

.split-columns {
  display: grid;
  grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr);
  gap: 24px;
  align-items: start;
}

.split-col {
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 20px;
  min-width: 0;
}

.col-title {
  font-size: 17px;
  margin-bottom: 6px;
}

.col-desc {
  font-size: 13px;
  color: var(--color-muted);
  margin-bottom: 16px;
}

.col-more {
  margin-top: 14px;
  font-size: 13px;
}

.col-more a {
  color: var(--color-secondary);
}

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

/* cover grid */

.cover-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
}

.cover-card {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transition: border-color 150ms ease, transform 150ms ease,
    box-shadow 150ms ease;
}

.cover-card:hover {
  border-color: var(--color-primary);
  transform: translateY(-2px);
  box-shadow: var(--shadow-hover);
}

.cover-figure {
  width: 100%;
}

.cover-figure img {
  width: 100%;
  aspect-ratio: 3 / 4;
  object-fit: cover;
  background: var(--color-tag-bg);
}

.cover-name {
  font-size: 13px;
  font-weight: 600;
  color: var(--color-text);
  padding: 8px 10px 4px;
  margin: 0;
  line-height: 1.4;
}

.cover-card .tag {
  margin: 0 10px 10px;
  align-self: flex-start;
}

/* update column */

.update-group {
  padding-bottom: 12px;
  margin-bottom: 12px;
  border-bottom: 1px solid var(--color-border);
}

.update-group:last-of-type {
  border-bottom: 0;
  margin-bottom: 0;
}

.update-date {
  font-size: 13px;
  font-family: var(--font-mono);
  color: var(--color-accent);
  font-weight: 600;
  margin-bottom: 6px;
}

.update-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  padding: 5px 0;
  font-size: 13px;
}

.update-name {
  color: var(--color-text);
  flex: 1 1 auto;
  min-width: 0;
}

.update-row .status {
  flex-shrink: 0;
}

.status {
  display: inline-block;
  padding: 1px 7px;
  font-size: 12px;
  border-radius: var(--radius-sm);
  white-space: nowrap;
}

.status-new {
  color: #ffffff;
  background: var(--color-accent);
}

.status-progress {
  color: var(--color-secondary);
  background: var(--color-tag-bg);
}

.status-done {
  color: var(--color-muted);
  background: var(--color-bg);
  border: 1px solid var(--color-border);
}

/* ranking + field summary split */

.rank-col .rank-list {
  display: flex;
  flex-direction: column;
}

.rank-row {
  display: grid;
  grid-template-columns: 28px minmax(0, 1fr) auto;
  gap: 10px;
  align-items: baseline;
  padding: 8px 0;
  border-bottom: 1px solid var(--color-border);
}

.rank-row:last-child {
  border-bottom: 0;
}

.rank-no {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--color-accent);
  font-weight: 600;
}

.rank-name {
  font-size: 14px;
  font-weight: 600;
  color: var(--color-text);
  margin: 0;
}

.rank-name a {
  color: var(--color-text);
}

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

.rank-note {
  font-size: 12px;
  color: var(--color-muted);
  grid-column: 2 / 3;
  margin: 0;
}

.field-col .field-table {
  font-size: 13px;
}

.field-table th,
.field-table td {
  text-align: left;
  padding: 8px 10px;
  border-bottom: 1px solid var(--color-border);
  vertical-align: top;
}

.field-table th {
  font-size: 12px;
  color: var(--color-secondary);
  font-weight: 600;
  background: var(--color-bg);
}

.field-table .field-name {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--color-primary);
  white-space: nowrap;
}

/* path section */

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

.path-step {
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.step-no {
  font-family: var(--font-mono);
  font-size: 24px;
  font-weight: 600;
  color: var(--color-border-strong);
  line-height: 1;
}

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

.step-desc {
  font-size: 13px;
  color: var(--color-muted);
  margin: 0;
}

.step-link {
  margin-top: auto;
  font-size: 13px;
  color: var(--color-secondary);
}

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

.path-feedback {
  margin-top: 20px;
  padding: 20px;
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px 20px;
}

.feedback-title {
  font-size: 17px;
  flex-shrink: 0;
}

.feedback-text {
  font-size: 13px;
  color: var(--color-muted);
  margin: 0;
  flex: 1 1 320px;
}

/* ============ pages: genre ============ */

.genre-groups .section-title {
  margin-bottom: 8px;
}

.genre-group {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 320px);
  gap: 24px;
  align-items: start;
  padding: 24px;
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  margin-bottom: 20px;
}

.genre-group:last-of-type {
  margin-bottom: 0;
}

.genre-group-body {
  min-width: 0;
}

.genre-group-name {
  font-size: 17px;
  margin-bottom: 8px;
}

.genre-group-trait {
  font-size: 14px;
  color: var(--color-text);
  margin-bottom: 8px;
  max-width: var(--content-narrow);
}

.genre-group-scope {
  font-size: 13px;
  color: var(--color-muted);
  margin-bottom: 14px;
}

.genre-entry-list {
  display: flex;
  flex-direction: column;
  border-top: 1px dashed var(--color-border);
  padding-top: 12px;
}

.genre-entry {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 8px 0;
  border-bottom: 1px solid var(--color-border);
}

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

.entry-name {
  font-size: 14px;
  color: var(--color-text);
}

.entry-tag {
  flex-shrink: 0;
  font-size: 12px;
  color: var(--color-secondary);
  background: var(--color-tag-bg);
  border-radius: var(--radius-sm);
  padding: 2px 8px;
  white-space: nowrap;
}

.genre-group-media img {
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  background: var(--color-tag-bg);
}

/* field consistency */

.field-consistency {
  margin-top: var(--space-section);
}

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

.consistency-col {
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 20px;
  min-width: 0;
}

.subsection-link {
  font-size: 13px;
  color: var(--color-secondary);
}

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

.subsection-text {
  font-size: 13px;
  color: var(--color-muted);
  margin-top: 8px;
}

/* next paths */

.next-paths {
  margin-top: var(--space-section);
}

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

.path-card {
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  transition: border-color 150ms ease, transform 150ms ease,
    box-shadow 150ms ease;
}

.path-card:hover {
  border-color: var(--color-primary);
  transform: translateY(-2px);
  box-shadow: var(--shadow-hover);
}

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

.path-text {
  font-size: 13px;
  color: var(--color-muted);
  margin: 0;
}

.path-link {
  margin: auto 0 0;
  font-size: 13px;
}

.path-link a {
  color: var(--color-secondary);
}

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

/* ============ pages: updates ============ */

.updates-batch {
  margin-bottom: 32px;
}

.updates-batch img {
  aspect-ratio: 21 / 9;
}

.updates-log .section-head,
.updates-legend .section-head,
.updates-scope .section-head {
  margin-bottom: 16px;
}

.updates-group {
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 18px 20px;
  margin-bottom: 16px;
}

.updates-group:last-of-type {
  margin-bottom: 0;
}

.updates-date {
  font-size: 14px;
  font-family: var(--font-mono);
  color: var(--color-accent);
  font-weight: 600;
  margin-bottom: 10px;
}

.updates-row {
  display: grid;
  grid-template-columns: 100px 120px minmax(0, 1fr) auto;
  gap: 12px;
  align-items: center;
  padding: 8px 0;
  border-bottom: 1px solid var(--color-border);
  font-size: 13px;
}

.updates-row:last-child {
  border-bottom: 0;
}

.row-field {
  min-width: 0;
}

.row-date {
  font-family: var(--font-mono);
  color: var(--color-muted);
}

.row-genre a {
  color: var(--color-secondary);
}

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

.row-title {
  color: var(--color-text);
  font-weight: 500;
}

.row-state {
  text-align: right;
}

/* legend */

.updates-legend {
  margin-top: var(--space-section);
}

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

.legend-col {
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 20px;
  min-width: 0;
}

.legend-title {
  font-size: 17px;
  margin-bottom: 8px;
}

.legend-text {
  font-size: 13px;
  color: var(--color-muted);
  margin-bottom: 12px;
}

.legend-list li {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  padding: 6px 0;
  font-size: 13px;
  color: var(--color-text);
  border-bottom: 1px dashed var(--color-border);
}

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

/* scope */

.updates-scope {
  margin-top: var(--space-section);
}

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

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

.scope-name {
  font-size: 17px;
  margin-bottom: 8px;
}

.scope-text {
  font-size: 13px;
  color: var(--color-muted);
  margin: 0;
}

.scope-note {
  margin-top: 16px;
  font-size: 13px;
  color: var(--color-muted);
}

.scope-note a {
  color: var(--color-secondary);
  margin-right: 12px;
}

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

/* ============ pages: ranking ============ */

.ranking-list-section .section-desc a {
  color: var(--color-secondary);
}

.ranking-list {
  display: flex;
  flex-direction: column;
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 8px 20px;
}

.ranking-row {
  display: grid;
  grid-template-columns: 40px minmax(0, 1fr);
  gap: 16px;
  padding: 14px 0;
  border-bottom: 1px solid var(--color-border);
  align-items: start;
}

.ranking-row:last-child {
  border-bottom: 0;
}

.rank-index {
  font-family: var(--font-mono);
  font-size: 18px;
  font-weight: 600;
  color: var(--color-accent);
  line-height: 1.4;
}

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

.rank-main .rank-name {
  font-size: 15px;
  margin-bottom: 4px;
}

.rank-main .rank-name a {
  color: var(--color-primary);
}

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

.rank-tag {
  display: inline-block;
  font-size: 12px;
  color: var(--color-secondary);
  background: var(--color-tag-bg);
  border-radius: var(--radius-sm);
  padding: 2px 8px;
  margin-bottom: 4px;
}

.rank-main .rank-note {
  font-size: 13px;
  color: var(--color-muted);
  margin: 4px 0 0;
  max-width: var(--content-narrow);
}

.ranking-notes-layout {
  display: grid;
  grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr);
  gap: 24px;
  align-items: start;
  margin-top: var(--space-section);
}

.basis-section,
.scope-notice {
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 20px;
  min-width: 0;
}

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

.basis-item {
  padding-bottom: 12px;
  border-bottom: 1px dashed var(--color-border);
}

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

.basis-name {
  font-size: 15px;
  margin-bottom: 4px;
}

.basis-text {
  font-size: 13px;
  color: var(--color-muted);
  margin: 0;
}

.scope-notice .scope-text {
  font-size: 13px;
  color: var(--color-text);
  margin-bottom: 10px;
}

.scope-notice .scope-text:last-child {
  margin-bottom: 0;
}

.ranking-media {
  margin-top: var(--space-section);
}

/* ============ pages: field-guide ============ */

.field-table-section .section-title,
.field-table-section .section-desc {
  margin-bottom: 8px;
}

.field-table-section .section-media {
  margin: 16px 0 20px;
}

.field-table {
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  overflow: hidden;
  font-size: 14px;
}

.field-table-caption {
  caption-side: top;
  text-align: left;
  padding: 12px 14px;
  font-size: 13px;
  color: var(--color-muted);
  border-bottom: 1px solid var(--color-border);
  background: var(--color-bg);
}

.field-table th,
.field-table td {
  text-align: left;
  padding: 12px 14px;
  border-bottom: 1px solid var(--color-border);
  vertical-align: top;
}

.field-table thead th {
  font-size: 13px;
  color: var(--color-secondary);
  font-weight: 600;
  background: var(--color-bg);
  white-space: nowrap;
}

.field-table tbody tr:last-child td {
  border-bottom: 0;
}

.field-table .field-name {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--color-primary);
  white-space: nowrap;
  width: 140px;
}

.field-table .field-mean {
  color: var(--color-text);
}

.field-table .field-rule {
  color: var(--color-muted);
  font-size: 13px;
}

.field-detail-layout {
  display: grid;
  grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr);
  gap: 24px;
  align-items: start;
  margin-top: var(--space-section);
}

.field-rule-section,
.field-boundary-section {
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 20px;
  min-width: 0;
}

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

.rule-item {
  padding-bottom: 12px;
  border-bottom: 1px dashed var(--color-border);
}

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

.rule-name {
  font-size: 15px;
  margin-bottom: 4px;
}

.rule-text {
  font-size: 13px;
  color: var(--color-muted);
  margin: 0;
}

.boundary-list li {
  position: relative;
  padding-left: 18px;
  margin-bottom: 10px;
  font-size: 13px;
  color: var(--color-text);
}

.boundary-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 9px;
  width: 8px;
  height: 2px;
  background: var(--color-accent);
}

.boundary-note {
  margin-top: 12px;
  font-size: 13px;
}

.boundary-note a {
  color: var(--color-secondary);
}

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

.site-index-section {
  margin-top: var(--space-section);
}

/* ============ pages: reading-guide ============ */

.page-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 24px;
}

.path-entries,
.feedback-block,
.faq-block {
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 24px;
}

.path-entries h2,
.feedback-block h2,
.faq-block h2 {
  font-size: 22px;
  margin-bottom: 8px;
}

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

.step-item {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 18px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.step-index {
  font-family: var(--font-mono);
  font-size: 22px;
  font-weight: 600;
  color: var(--color-border-strong);
  line-height: 1;
}

.step-item .step-name {
  font-size: 17px;
}

.step-text {
  font-size: 13px;
  color: var(--color-muted);
  margin: 0;
}

.entry-list {
  display: flex;
  flex-direction: column;
  margin-top: 16px;
}

.entry-item {
  display: grid;
  grid-template-columns: 40px minmax(0, 1fr);
  gap: 16px;
  padding: 14px 0;
  border-bottom: 1px solid var(--color-border);
}

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

.entry-index {
  font-family: var(--font-mono);
  font-size: 18px;
  font-weight: 600;
  color: var(--color-accent);
  line-height: 1.4;
}

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

.entry-body .entry-name {
  font-size: 15px;
  margin-bottom: 4px;
}

.entry-desc {
  font-size: 13px;
  color: var(--color-muted);
  margin-bottom: 6px;
}

.entry-link {
  font-size: 13px;
  color: var(--color-secondary);
}

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

.entry-note {
  margin-top: 14px;
  font-size: 13px;
  color: var(--color-muted);
}

.entry-note a {
  color: var(--color-secondary);
}

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

.path-figure {
  margin: 0;
}

.path-figure img {
  aspect-ratio: 21 / 9;
}

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

.feedback-item {
  padding: 16px;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
}

.feedback-name {
  font-size: 15px;
  margin-bottom: 4px;
}

.faq-list {
  margin-top: 16px;
  border-top: 1px solid var(--color-border);
}

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

.faq-question {
  cursor: pointer;
  padding: 14px 28px 14px 4px;
  font-size: 15px;
  font-weight: 600;
  color: var(--color-primary);
  list-style: none;
  position: relative;
}

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

.faq-question::after {
  content: "+";
  position: absolute;
  right: 4px;
  top: 50%;
  transform: translateY(-50%);
  font-size: 18px;
  color: var(--color-secondary);
  font-weight: 400;
}

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

.faq-answer {
  padding: 0 4px 16px;
  font-size: 14px;
  color: var(--color-muted);
  margin: 0;
}

/* ============ pages: 404 ============ */

.error-main {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 60px 20px;
}

.error-panel {
  max-width: 560px;
  width: 100%;
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 40px;
  text-align: center;
}

.error-code {
  font-family: var(--font-mono);
  font-size: 42px;
  font-weight: 600;
  color: var(--color-accent);
  margin-bottom: 8px;
  line-height: 1;
}

.error-title {
  font-size: 26px;
  margin-bottom: 12px;
}

.error-text {
  font-size: 14px;
  color: var(--color-muted);
  margin-bottom: 20px;
}

.error-links {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 8px;
  margin-bottom: 20px;
}

.error-links li a {
  display: inline-block;
  padding: 8px 14px;
  font-size: 13px;
  color: var(--color-secondary);
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  transition: border-color 150ms ease, color 150ms ease;
}

.error-links li a:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
}

.error-actions {
  margin: 0;
}

.error-home {
  display: inline-flex;
  align-items: center;
  padding: 10px 20px;
  background: var(--color-primary);
  color: #ffffff;
  border-radius: var(--radius);
  font-size: 14px;
  min-height: 44px;
}

.error-home:hover {
  background: #162c48;
  color: #ffffff;
}

/* ============ responsive: 960px ============ */

@media (max-width: 960px) {
  .fact-bar {
    padding: 8px 20px;
  }

  .site-header {
    padding: 12px 20px;
  }

  .hero-workbench {
    grid-template-columns: minmax(0, 1fr);
    gap: 24px;
    padding-top: 28px;
  }

  .hero-visual {
    order: 2;
  }

  .hero-tags {
    order: 3;
  }

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

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

  .path-steps,
  .path-grid,
  .scope-list,
  .feedback-list,
  .step-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

  .genre-group-media {
    order: -1;
  }

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

  .ranking-notes-layout,
  .field-detail-layout {
    grid-template-columns: minmax(0, 1fr);
  }

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

  .updates-row {
    grid-template-columns: 90px minmax(0, 1fr) auto;
  }

  .updates-row .row-title {
    grid-column: 2 / 3;
    grid-row: 2;
  }

  .updates-row .row-state {
    grid-column: 3 / 4;
    grid-row: 1 / 3;
    align-self: center;
  }
}

/* ============ responsive: 640px ============ */

@media (max-width: 640px) {
  body {
    font-size: 14px;
  }

  .site-header {
    padding: 10px 16px;
  }

  .home-main,
  .inner-main {
    padding: 0 16px 40px;
  }

  .nav-toggle {
    display: flex;
  }

  .site-nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--color-card);
    border-bottom: 1px solid var(--color-border);
    box-shadow: 0 6px 16px rgba(31, 58, 95, 0.08);
    padding: 8px 16px 12px;
    display: block;
  }

  .nav-list {
    display: none;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
  }

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

  .nav-list li a {
    display: block;
    padding: 12px 4px;
    min-height: 44px;
    border-bottom: 1px solid var(--color-border);
    border-left: 0;
    border-right: 0;
    border-top: 0;
  }

  .nav-list li a.is-current {
    border-bottom-color: var(--color-primary);
    border-left: 3px solid var(--color-primary);
    padding-left: 10px;
  }

  .fact-bar {
    flex-direction: column;
    align-items: flex-start;
    gap: 6px;
    padding: 10px 16px;
  }

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

  .section-title,
  .path-entries h2,
  .feedback-block h2,
  .faq-block h2 {
    font-size: 20px;
  }

  .section {
    margin-top: 32px;
  }

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

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

  .path-steps,
  .path-grid,
  .scope-list,
  .feedback-list,
  .step-list,
  .index-grid,
  .site-index-list,
  .index-list {
    grid-template-columns: minmax(0, 1fr);
  }

  .path-feedback {
    flex-direction: column;
    align-items: flex-start;
  }

  .feedback-text {
    flex: 1 1 auto;
  }

  .updates-row {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: 4px;
    padding: 12px;
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    margin-bottom: 8px;
    background: var(--color-bg);
  }

  .updates-row:last-child {
    margin-bottom: 0;
  }

  .row-state {
    text-align: left;
  }

  .ranking-row {
    grid-template-columns: 32px minmax(0, 1fr);
    gap: 12px;
  }

  .field-table {
    font-size: 13px;
  }

  .field-table thead {
    display: none;
  }

  .field-table,
  .field-table tbody,
  .field-table tr,
  .field-table td {
    display: block;
    width: 100%;
  }

  .field-table tr {
    padding: 12px 14px;
    border-bottom: 1px solid var(--color-border);
  }

  .field-table tr:last-child {
    border-bottom: 0;
  }

  .field-table td {
    border-bottom: 0;
    padding: 2px 0;
  }

  .field-table .field-name {
    width: auto;
    font-size: 13px;
    color: var(--color-primary);
  }

  .field-table .field-mean {
    font-size: 14px;
  }

  .field-table .field-rule {
    font-size: 13px;
    color: var(--color-muted);
  }

  .field-table .field-mean::before {
    content: "含义：";
    color: var(--color-muted);
    font-size: 12px;
  }

  .field-table .field-rule::before {
    content: "口径：";
    color: var(--color-muted);
    font-size: 12px;
  }

  .field-table-caption {
    padding: 10px 14px;
  }

  .error-panel {
    padding: 28px 20px;
  }

  .error-code {
    font-size: 34px;
  }

  .error-title {
    font-size: 22px;
  }

  .footer-grid {
    grid-template-columns: minmax(0, 1fr);
    gap: 24px;
    padding: 32px 16px 20px;
  }

  .footer-bottom {
    padding: 14px 16px 24px;
    flex-direction: column;
  }
}

/* ============ motion enhancement ============ */

@media (prefers-reduced-motion: no-preference) {
  .cover-card,
  .genre-cell,
  .path-card,
  .index-cell a,
  .site-index-item a,
  .index-item a {
    will-change: transform;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

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