:root {
  color-scheme: light dark;
  --bg: #f5f5f7;
  --surface: rgba(255, 255, 255, 0.78);
  --surface-solid: #ffffff;
  --text: #1d1d1f;
  --muted: #6e6e73;
  --line: rgba(0, 0, 0, 0.08);
  --blue: #0071e3;
  --blue-hover: #0077ed;
  --radius-lg: 32px;
  --radius-md: 22px;
  --shadow: 0 24px 70px rgba(0, 0, 0, 0.07);
  --wrap: 1080px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background:
    radial-gradient(circle at 20% 0%, rgba(255,255,255,0.95), transparent 34rem),
    var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Display", "SF Pro Text", "Helvetica Neue", Arial, sans-serif;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

a {
  color: inherit;
}

.wrap {
  width: min(calc(100% - 40px), var(--wrap));
  margin-inline: auto;
}

.site-header {
  width: min(calc(100% - 40px), var(--wrap));
  height: 68px;
  margin-inline: auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--line);
}

.brand {
  font-size: 15px;
  font-weight: 650;
  letter-spacing: -0.02em;
  text-decoration: none;
}

.site-header nav {
  display: flex;
  gap: 24px;
}

.site-header nav a {
  color: var(--muted);
  font-size: 14px;
  text-decoration: none;
  transition: color 160ms ease;
}

.site-header nav a:hover {
  color: var(--text);
}

.hero {
  padding: 112px 0 92px;
}

.eyebrow {
  margin: 0 0 14px;
  color: var(--muted);
  font-size: 14px;
  font-weight: 600;
  letter-spacing: -0.01em;
  text-transform: none;
}

.hero h1,
.reading-hero h1 {
  max-width: 900px;
  margin: 0;
  font-size: clamp(48px, 8vw, 92px);
  line-height: 0.98;
  letter-spacing: -0.055em;
  font-weight: 720;
}

.hero-copy {
  max-width: 680px;
  margin: 28px 0 0;
  color: var(--muted);
  font-size: clamp(19px, 2.5vw, 25px);
  line-height: 1.35;
  letter-spacing: -0.025em;
}

.section {
  padding: 48px 0 72px;
}

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

.section-heading h2 {
  max-width: 760px;
  margin: 0;
  font-size: clamp(34px, 5vw, 56px);
  line-height: 1.04;
  letter-spacing: -0.045em;
}

.date {
  margin: 0;
  color: var(--muted);
  font-size: 14px;
}

.feature-card,
.quiet-card,
.reading-card,
.source-card,
.output-card {
  background: var(--surface);
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
  backdrop-filter: blur(22px);
  -webkit-backdrop-filter: blur(22px);
}

.feature-card {
  display: grid;
  grid-template-columns: minmax(0, 1.55fr) minmax(250px, 0.75fr);
  gap: 32px;
  padding: clamp(28px, 5vw, 58px);
  border-radius: var(--radius-lg);
}

.tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 24px;
}

.tags span {
  padding: 7px 11px;
  border-radius: 999px;
  background: rgba(0, 113, 227, 0.08);
  color: var(--blue);
  font-size: 12px;
  font-weight: 650;
}

.feature-card h2 {
  max-width: 720px;
  margin: 0;
  font-size: clamp(34px, 5vw, 58px);
  line-height: 1.03;
  letter-spacing: -0.045em;
}

.feature-card .feature-copy > p {
  max-width: 640px;
  margin: 22px 0 0;
  color: var(--muted);
  font-size: 19px;
  line-height: 1.45;
  letter-spacing: -0.02em;
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 30px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  padding: 0 20px;
  border-radius: 999px;
  font-size: 15px;
  font-weight: 620;
  text-decoration: none;
  transition: transform 160ms ease, background 160ms ease;
}

.button:hover {
  transform: translateY(-1px);
}

.button.primary {
  background: var(--blue);
  color: white;
}

.button.primary:hover {
  background: var(--blue-hover);
}

.button.secondary {
  background: rgba(0, 0, 0, 0.055);
}

.metric-panel {
  display: grid;
  align-content: center;
  gap: 1px;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: var(--line);
}

.metric {
  min-height: 120px;
  padding: 22px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  background: rgba(255,255,255,0.64);
}

.metric strong {
  font-size: 35px;
  line-height: 1;
  letter-spacing: -0.04em;
}

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

.card-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
}

.quiet-card {
  min-height: 260px;
  padding: 30px;
  border-radius: var(--radius-md);
}

.card-number {
  margin: 0 0 54px;
  color: var(--muted);
  font-size: 13px;
}

.quiet-card h3 {
  margin: 0 0 10px;
  font-size: 28px;
  letter-spacing: -0.035em;
}

.quiet-card p:last-child {
  margin: 0;
  color: var(--muted);
  font-size: 16px;
}

.archive-row {
  display: grid;
  grid-template-columns: 90px minmax(0, 1fr) 24px;
  gap: 18px;
  align-items: center;
  padding: 24px 0;
  border-top: 1px solid var(--line);
  text-decoration: none;
}

.archive-row:last-child {
  border-bottom: 1px solid var(--line);
}

.archive-date,
.archive-arrow {
  color: var(--muted);
  font-size: 14px;
}

.archive-title {
  font-size: 18px;
  font-weight: 560;
  letter-spacing: -0.02em;
}

.site-footer {
  padding: 40px 0 64px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 13px;
}

/* Reading page */
.reading-hero {
  padding: 86px 0 64px;
}

.reading-hero h1 {
  max-width: 960px;
  font-size: clamp(46px, 7vw, 78px);
}

.reading-deck {
  max-width: 760px;
  margin: 26px 0 0;
  color: var(--muted);
  font-size: 21px;
  line-height: 1.45;
  letter-spacing: -0.02em;
}

.meta-strip {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  margin-top: 42px;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.meta-item {
  padding: 20px 18px 20px 0;
}

.meta-item + .meta-item {
  padding-left: 18px;
  border-left: 1px solid var(--line);
}

.meta-item span {
  display: block;
  color: var(--muted);
  font-size: 12px;
}

.meta-item strong {
  display: block;
  margin-top: 4px;
  font-size: 15px;
}

.reading-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 280px;
  gap: 52px;
  padding-bottom: 90px;
}

.reading-main section {
  padding: 34px 0 48px;
  border-top: 1px solid var(--line);
}

.reading-main h2 {
  margin: 0 0 22px;
  font-size: 34px;
  line-height: 1.1;
  letter-spacing: -0.04em;
}

.reading-main h3 {
  margin: 28px 0 10px;
  font-size: 20px;
  letter-spacing: -0.025em;
}

.reading-main p,
.reading-main li {
  font-size: 17px;
  line-height: 1.7;
}

.reading-main p {
  margin: 0 0 18px;
}

.reading-main ol,
.reading-main ul {
  padding-left: 24px;
}

.reading-main blockquote {
  margin: 24px 0 0;
  padding: 24px 26px;
  border-radius: var(--radius-md);
  background: var(--surface-solid);
  border: 1px solid var(--line);
  font-size: 22px;
  line-height: 1.45;
  letter-spacing: -0.025em;
}

.reading-card,
.output-card {
  padding: 26px;
  border-radius: var(--radius-md);
}

.timeline {
  display: grid;
  gap: 1px;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: var(--line);
}

.timeline-row {
  display: grid;
  grid-template-columns: 80px 120px minmax(0, 1fr);
  gap: 14px;
  padding: 18px;
  background: var(--surface-solid);
}

.timeline-row strong {
  font-size: 14px;
}

.timeline-row span,
.timeline-row p {
  margin: 0;
  font-size: 14px;
}

.timeline-row span {
  color: var(--blue);
  font-weight: 650;
}

.source-list {
  display: grid;
  gap: 14px;
}

.source-card {
  display: block;
  padding: 22px;
  border-radius: 18px;
  text-decoration: none;
  transition: transform 160ms ease;
}

.source-card:hover {
  transform: translateY(-2px);
}

.source-card small {
  color: var(--blue);
  font-weight: 650;
}

.source-card strong {
  display: block;
  margin-top: 7px;
  font-size: 18px;
  line-height: 1.35;
}

.source-card span {
  display: block;
  margin-top: 8px;
  color: var(--muted);
  font-size: 13px;
}

table {
  width: 100%;
  border-collapse: collapse;
  background: var(--surface-solid);
  border-radius: 18px;
  overflow: hidden;
  box-shadow: 0 0 0 1px var(--line);
}

th,
td {
  padding: 15px 16px;
  border-bottom: 1px solid var(--line);
  text-align: left;
  vertical-align: top;
  font-size: 14px;
}

th {
  color: var(--muted);
  font-size: 12px;
  font-weight: 650;
}

tr:last-child td {
  border-bottom: 0;
}

.reading-aside {
  position: relative;
}

.aside-inner {
  position: sticky;
  top: 24px;
  padding-top: 34px;
}

.aside-title {
  margin: 0 0 12px;
  color: var(--muted);
  font-size: 12px;
  font-weight: 650;
}

.aside-inner a {
  display: block;
  padding: 9px 0;
  color: var(--muted);
  font-size: 14px;
  text-decoration: none;
}

.aside-inner a:hover {
  color: var(--text);
}

.output-card {
  background: #1d1d1f;
  color: #f5f5f7;
}

.output-card p,
.output-card li {
  color: #d2d2d7;
}

@media (max-width: 820px) {
  .hero {
    padding: 78px 0 60px;
  }

  .feature-card,
  .reading-layout {
    grid-template-columns: 1fr;
  }

  .card-grid {
    grid-template-columns: 1fr;
  }

  .quiet-card {
    min-height: auto;
  }

  .card-number {
    margin-bottom: 28px;
  }

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

  .meta-item:nth-child(3) {
    border-left: 0;
    border-top: 1px solid var(--line);
  }

  .meta-item:nth-child(4) {
    border-top: 1px solid var(--line);
  }

  .reading-aside {
    display: none;
  }

  .timeline-row {
    grid-template-columns: 70px 1fr;
  }

  .timeline-row p {
    grid-column: 1 / -1;
  }
}

@media (max-width: 560px) {
  .site-header nav {
    gap: 14px;
  }

  .hero h1,
  .reading-hero h1 {
    font-size: 48px;
  }

  .feature-card {
    padding: 26px;
    border-radius: 24px;
  }

  .feature-card h2 {
    font-size: 36px;
  }

  .archive-row {
    grid-template-columns: 62px minmax(0, 1fr) 18px;
    gap: 10px;
  }

  .meta-strip {
    grid-template-columns: 1fr;
  }

  .meta-item + .meta-item,
  .meta-item:nth-child(3),
  .meta-item:nth-child(4) {
    padding-left: 0;
    border-left: 0;
    border-top: 1px solid var(--line);
  }

  table {
    display: block;
    overflow-x: auto;
  }
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #000000;
    --surface: rgba(28, 28, 30, 0.76);
    --surface-solid: #1c1c1e;
    --text: #f5f5f7;
    --muted: #a1a1a6;
    --line: rgba(255, 255, 255, 0.12);
    --shadow: 0 24px 70px rgba(0, 0, 0, 0.35);
  }

  body {
    background:
      radial-gradient(circle at 20% 0%, rgba(40,40,44,0.8), transparent 34rem),
      var(--bg);
  }

  .metric {
    background: rgba(28,28,30,0.72);
  }

  .button.secondary {
    background: rgba(255,255,255,0.1);
  }
}