:root {
  color-scheme: light dark;
  --page: #f4f8f9;
  --surface: #ffffff;
  --surface-subtle: #eaf2f4;
  --surface-raised: #ffffff;
  --text: #17252b;
  --text-secondary: #42545c;
  --text-tertiary: #596c74;
  --border: #d5e0e3;
  --card-border: transparent;
  --accent: #0e7490;
  --accent-hover: #0b6178;
  --accent-soft: #dff1f5;
  --on-accent: #ffffff;
  --warning: #765200;
  --warning-soft: #fff3cf;
  --error: #a61b2b;
  --shadow-card:
    0 1px 2px rgb(25 57 66 / 4%),
    0 8px 24px rgb(25 57 66 / 6%);
  --radius-card: 12px;
  --radius-control: 8px;
  --transition-snap: 140ms ease-out;
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "SF Pro Text", "PingFang SC", "Microsoft YaHei", "Noto Sans CJK SC", sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  background: var(--page);
}

body {
  min-width: 320px;
  margin: 0;
  background: var(--page);
  color: var(--text);
  font-size: 16px;
  line-height: 1.65;
}

a {
  color: var(--accent);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.2em;
  transition: color var(--transition-snap), background-color var(--transition-snap), transform var(--transition-snap);
}

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

a:focus-visible,
button:focus-visible,
[tabindex]:focus-visible {
  border-radius: var(--radius-control);
  outline: 3px solid var(--accent);
  outline-offset: 3px;
}

.skip-link {
  position: fixed;
  top: -80px;
  left: 16px;
  z-index: 20;
  padding: 8px 16px;
  border-radius: var(--radius-control);
  background: var(--surface-raised);
  box-shadow: var(--shadow-card);
  font-weight: 700;
}

.skip-link:focus {
  top: 16px;
}

.site-header {
  border-bottom: 1px solid var(--border);
  background: color-mix(in srgb, var(--page) 92%, transparent);
}

.nav {
  display: flex;
  width: min(1120px, calc(100% - 48px));
  min-height: 72px;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  margin: auto;
}

.brand {
  display: inline-flex;
  min-height: 40px;
  align-items: center;
  gap: 8px;
  color: var(--text);
  font-weight: 700;
  letter-spacing: -0.02em;
  text-decoration: none;
}

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

.brand-mark {
  display: grid;
  width: 32px;
  height: 32px;
  place-items: center;
  border-radius: var(--radius-control);
  background: var(--accent);
  color: var(--on-accent);
  font-size: 14px;
  font-weight: 700;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 8px;
}

.nav-links a {
  display: inline-flex;
  min-height: 40px;
  align-items: center;
  padding: 8px 12px;
  border-radius: var(--radius-control);
  color: var(--text-secondary);
  font-size: 14px;
  font-weight: 600;
  text-decoration: none;
}

.nav-links a:hover {
  background: var(--surface-subtle);
  color: var(--text);
}

.nav-links a[aria-current="page"],
.nav-links a[aria-current="true"] {
  background: var(--accent-soft);
  color: var(--accent);
}

.shell {
  width: min(1040px, calc(100% - 48px));
  margin: 0 auto;
  padding: 64px 0 96px;
}

#app,
.archive {
  display: grid;
  gap: 32px;
}

.hero-card,
.surface-card,
.state-card {
  border: 1px solid var(--card-border);
  border-radius: var(--radius-card);
  background: var(--surface);
  box-shadow: var(--shadow-card);
}

.hero-card {
  position: relative;
  overflow: hidden;
  padding: clamp(32px, 6vw, 64px);
}

.hero-card::before,
.state-card::before {
  position: absolute;
  top: 0;
  right: 0;
  left: 0;
  height: 4px;
  background: var(--accent);
  content: "";
}

.eyebrow {
  margin: 0 0 16px;
  color: var(--accent);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.brief-title,
.state-title {
  max-width: 18ch;
  margin: 0;
  font-size: clamp(40px, 6vw, 64px);
  font-weight: 700;
  line-height: 1.08;
  letter-spacing: -0.03em;
  text-wrap: balance;
}

.brief-intro {
  max-width: 65ch;
  margin: 24px 0 0;
  color: var(--text-secondary);
  font-size: 18px;
  line-height: 1.65;
}

.metadata {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px 16px;
  margin-top: 24px;
  color: var(--text-tertiary);
  font-size: 14px;
  font-variant-numeric: tabular-nums;
}

.status {
  display: inline-flex;
  min-height: 28px;
  align-items: center;
  padding: 4px 12px;
  border-radius: 999px;
  font-size: 13px;
  font-weight: 700;
}

.status-complete {
  background: var(--surface-subtle);
  color: var(--text-secondary);
}

.status-partial {
  background: var(--warning-soft);
  color: var(--warning);
}

.coverage {
  display: grid;
  overflow: hidden;
  grid-template-columns: repeat(4, 1fr);
  gap: 1px;
  margin: 32px 0 0;
  border-radius: var(--radius-control);
  background: var(--border);
}

.coverage-item {
  min-width: 0;
  padding: 16px;
  background: var(--surface-subtle);
}

.coverage-source,
.coverage-count {
  margin: 0;
}

.coverage-source {
  overflow: hidden;
  color: var(--text-tertiary);
  font-size: 13px;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.coverage-count {
  margin-top: 4px;
  font-size: 20px;
  font-variant-numeric: tabular-nums;
  font-weight: 700;
}

.notice {
  margin: 24px 0 0;
  padding: 12px 16px;
  border-radius: var(--radius-control);
  font-size: 14px;
  font-weight: 600;
}

.notice-delay,
.notice-partial {
  background: var(--warning-soft);
  color: var(--warning);
}

.brief-section {
  overflow: hidden;
}

.section-header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 24px;
  padding: 24px 32px;
  border-bottom: 1px solid var(--border);
}

.section-title {
  margin: 0;
  font-size: 24px;
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.25;
}

.section-meta {
  margin: 0;
  color: var(--text-tertiary);
  font-size: 14px;
}

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

.brief-item + .brief-item {
  border-top: 1px solid var(--border);
}

.brief-entry {
  padding: 40px 32px;
}

.item-title {
  display: grid;
  grid-template-columns: 40px minmax(0, 1fr);
  align-items: baseline;
  gap: 16px;
  margin: 0;
  font-size: clamp(20px, 2.5vw, 28px);
  font-weight: 700;
  line-height: 1.3;
  letter-spacing: -0.02em;
}

.rank {
  color: var(--accent);
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  font-size: 14px;
  font-variant-numeric: tabular-nums;
  font-weight: 700;
  letter-spacing: 0.08em;
}

.summary,
.why,
.continuity,
.tags,
.sources {
  margin-left: 56px;
}

.summary {
  max-width: 65ch;
  margin-top: 16px;
  margin-bottom: 0;
  font-size: 17px;
}

.why {
  max-width: 65ch;
  margin-top: 24px;
  margin-bottom: 0;
  padding: 16px 24px;
  border-radius: var(--radius-control);
  background: var(--surface-subtle);
}

.why-title {
  margin: 0;
  color: var(--accent);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.08em;
}

.why-copy {
  margin: 8px 0 0;
}

.continuity {
  max-width: 65ch;
  margin-top: 16px;
  margin-bottom: 0;
  color: var(--text-secondary);
  font-size: 14px;
}

.tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 24px;
  margin-bottom: 0;
  padding: 0;
  list-style: none;
}

.tag {
  padding: 4px 12px;
  border: 1px solid var(--border);
  border-radius: 999px;
  color: var(--text-secondary);
  font-size: 13px;
  font-weight: 600;
}

.sources {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin-top: 16px;
  margin-bottom: 0;
}

.sources-label {
  color: var(--text-tertiary);
  font-size: 13px;
}

.source {
  display: inline-flex;
  min-height: 36px;
  align-items: center;
  padding: 4px 12px;
  border-radius: var(--radius-control);
  background: var(--surface-subtle);
  font-size: 14px;
  font-weight: 600;
  text-decoration: none;
}

.source:hover {
  background: var(--accent-soft);
}

.state-card {
  position: relative;
  display: flex;
  min-height: 520px;
  flex-direction: column;
  align-items: flex-start;
  justify-content: center;
  overflow: hidden;
  padding: clamp(32px, 6vw, 64px);
}

.state-copy {
  max-width: 65ch;
  margin: 24px 0 0;
  color: var(--text-secondary);
  font-size: 17px;
}

.button-link {
  display: inline-flex;
  min-height: 44px;
  align-items: center;
  margin-top: 24px;
  padding: 8px 16px;
  border-radius: var(--radius-control);
  background: var(--accent);
  color: var(--on-accent);
  font-weight: 700;
  text-decoration: none;
}

.button-link:hover {
  background: var(--accent-hover);
  color: var(--on-accent);
  transform: translateY(-1px);
}

.skeleton-lines {
  display: grid;
  width: min(100%, 640px);
  gap: 16px;
  margin-top: 40px;
}

.skeleton-lines span {
  height: 16px;
  border-radius: var(--radius-control);
  background: linear-gradient(90deg, var(--surface-subtle) 0%, var(--border) 50%, var(--surface-subtle) 100%);
  background-size: 200% 100%;
  animation: skeleton-shimmer 1.4s linear infinite;
}

.skeleton-lines span:nth-child(2) {
  width: 88%;
}

.skeleton-lines span:nth-child(3) {
  width: 64%;
}

@keyframes skeleton-shimmer {
  to {
    background-position: -200% 0;
  }
}

.archive-total {
  margin: 24px 0 0;
  color: var(--text-tertiary);
  font-size: 14px;
  font-variant-numeric: tabular-nums;
  font-weight: 600;
}

.archive-card {
  overflow: hidden;
}

.archive-month + .archive-month {
  border-top: 1px solid var(--border);
}

.archive-month-title {
  margin: 0;
  padding: 24px 32px 16px;
  color: var(--text-secondary);
  font-size: 20px;
  font-variant-numeric: tabular-nums;
  font-weight: 700;
}

.archive-list {
  margin: 0;
  padding: 0 16px 16px;
  list-style: none;
}

.archive-row {
  display: grid;
  min-height: 56px;
  grid-template-columns: minmax(0, 1fr) auto auto;
  align-items: center;
  gap: 16px;
  padding: 8px 16px;
  border-radius: var(--radius-control);
  transition: background-color var(--transition-snap);
}

.archive-row:hover {
  background: var(--surface-subtle);
}

.archive-date {
  color: var(--text);
  font-size: 16px;
  font-variant-numeric: tabular-nums;
  font-weight: 700;
  text-decoration: none;
}

.archive-count {
  color: var(--text-tertiary);
  font-size: 14px;
  font-variant-numeric: tabular-nums;
}

.brief-empty,
.archive-empty {
  padding: 48px 32px;
}

.footer {
  padding: 0 24px 32px;
}

.footer-inner {
  width: min(1040px, 100%);
  margin: auto;
  padding: 24px 32px;
  border-radius: var(--radius-card);
  background: var(--surface-subtle);
  color: var(--text-tertiary);
  font-size: 14px;
  text-align: center;
}

.footer p {
  margin: 0;
}

@media (max-width: 720px) {
  .nav {
    width: min(100% - 32px, 1120px);
    min-height: 64px;
    gap: 8px;
  }

  .brand > span:last-child {
    display: none;
  }

  .nav-links a {
    min-height: 44px;
    padding: 8px;
  }

  .brand {
    min-height: 44px;
  }

  .shell {
    width: min(100% - 32px, 1040px);
    padding: 32px 0 64px;
  }

  #app,
  .archive {
    gap: 24px;
  }

  .hero-card,
  .state-card {
    padding: 32px 24px;
  }

  .brief-title,
  .state-title {
    font-size: clamp(36px, 11vw, 48px);
  }

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

  .section-header {
    display: block;
    padding: 24px;
  }

  .section-meta {
    margin-top: 8px;
  }

  .brief-entry {
    padding: 32px 24px;
  }

  .item-title {
    grid-template-columns: 32px minmax(0, 1fr);
    gap: 8px;
  }

  .summary,
  .why,
  .continuity,
  .tags,
  .sources {
    margin-left: 40px;
  }

  .why {
    padding: 16px;
  }

  .archive-month-title {
    padding: 24px 24px 16px;
  }

  .archive-list {
    padding: 0 8px 16px;
  }

  .archive-row {
    grid-template-columns: minmax(0, 1fr) auto;
    gap: 8px;
  }

  .source {
    min-height: 44px;
  }

  .brief-empty,
  .archive-empty {
    padding: 40px 24px;
  }

  .footer {
    padding: 0 16px 24px;
  }

  .footer-inner {
    padding: 24px;
    text-align: left;
  }
}

@media (prefers-color-scheme: dark) {
  :root {
    --page: #0f171a;
    --surface: #172126;
    --surface-subtle: #202e34;
    --surface-raised: #26373e;
    --text: #edf5f6;
    --text-secondary: #bdcbd0;
    --text-tertiary: #98abb1;
    --border: rgb(214 239 244 / 14%);
    --card-border: rgb(214 239 244 / 14%);
    --accent: #67e8f9;
    --accent-hover: #a5f3fc;
    --accent-soft: rgb(103 232 249 / 12%);
    --on-accent: #0d2a31;
    --warning: #f6c85f;
    --warning-soft: rgb(246 200 95 / 12%);
    --error: #ff8a96;
    --shadow-card: none;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
  }
}