:root {
  --bg: #ffffff;
  --bg-soft: #faf8f6;
  --bg-panel: #fffdfb;
  --text: #27211f;
  --muted: #6f6560;
  --line: rgba(39, 33, 31, 0.14);
  --accent: #232f3e;
  --accent-dark: #16202c;
  --accent-soft: rgba(35, 47, 62, 0.08);
  --shadow: 0 16px 42px rgba(39, 33, 31, 0.08);
  --font-serif: Georgia, "Times New Roman", serif;
  --font-sans: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", monospace;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--text);
  background: var(--bg);
  font-family: var(--font-sans);
  font-size: 17px;
  line-height: 1.6;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

a {
  color: var(--accent-dark);
  text-decoration-thickness: 0.08em;
  text-underline-offset: 0.16em;
}

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

.container {
  width: min(calc(100% - 2rem), 820px);
  margin: 0 auto;
}

.container-wide {
  width: min(calc(100% - 2rem), 1080px);
  margin: 0 auto;
}

.brand-logo {
  position: fixed;
  top: 1.1rem;
  left: 1.1rem;
  z-index: 30;
  display: block;
  width: 136px;
  padding: 0.35rem 0.45rem;
  border: 1px solid rgba(39, 33, 31, 0.1);
  border-radius: 7px;
  background: rgba(255, 255, 255, 0.82);
  box-shadow: 0 8px 24px rgba(39, 33, 31, 0.06);
  backdrop-filter: blur(8px);
}

.brand-logo img {
  width: 100%;
  height: auto;
}

.page-nav {
  position: fixed;
  top: 50%;
  left: 1rem;
  transform: translateY(-50%);
  z-index: 20;
  display: grid;
  gap: 0.15rem;
  font-size: 0.78rem;
  opacity: 0;
  pointer-events: none;
  transition: opacity 180ms ease;
}

.page-nav.visible {
  opacity: 1;
  pointer-events: auto;
}

.page-nav a {
  color: #a59a96;
  text-decoration: none;
  border-left: 2px solid transparent;
  padding: 0.2rem 0.55rem;
}

.page-nav a.active,
.page-nav a:hover {
  color: var(--text);
  border-left-color: var(--accent);
}

.hero {
  padding: 4.8rem 0 3.4rem;
  text-align: center;
  background:
    linear-gradient(180deg, rgba(35, 47, 62, 0.06), rgba(255, 255, 255, 0) 68%),
    var(--bg);
}

.kicker,
.eyebrow {
  color: var(--accent-dark);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.hero h1 {
  max-width: 980px;
  margin: 0.5rem auto 1rem;
  font-family: var(--font-serif);
  font-size: clamp(2.25rem, 5vw, 4.2rem);
  font-weight: 700;
  line-height: 1.05;
  letter-spacing: 0;
}

.link-row {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.75rem;
  margin: 1.55rem 0 1.7rem;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 2.35rem;
  padding: 0.5rem 1rem;
  border: 1px solid var(--line);
  border-radius: 7px;
  color: var(--text);
  background: rgba(255, 255, 255, 0.78);
  text-decoration: none;
  font-size: 0.92rem;
  font-weight: 650;
  transition: border-color 160ms ease, color 160ms ease, transform 160ms ease;
}

.button:hover {
  color: var(--accent-dark);
  border-color: rgba(35, 47, 62, 0.5);
  transform: translateY(-1px);
}

.button.primary {
  color: #fff;
  border-color: var(--accent);
  background: var(--accent);
}

.button.primary:hover {
  color: #fff;
  border-color: var(--accent-dark);
  background: var(--accent-dark);
}

.hero-summary {
  max-width: 780px;
  margin: 0 auto;
  color: #463d39;
  font-size: 1.08rem;
}

.section {
  padding: 3.2rem 0;
}

.section + .section {
  border-top: 1px solid var(--line);
}

.section-heading {
  margin-bottom: 1.4rem;
}

.section-heading h2 {
  margin: 0.25rem 0 0;
  font-family: var(--font-serif);
  font-size: clamp(1.65rem, 3vw, 2.35rem);
  line-height: 1.18;
  letter-spacing: 0;
}

.figure-panel {
  margin: 1.8rem 0 0;
  padding: 1rem;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--bg-panel);
  box-shadow: var(--shadow);
}

.figure-panel img {
  width: 100%;
  height: auto;
  border-radius: 5px;
}

.figure-panel figcaption {
  max-width: 82ch;
  margin: 0.8rem auto 0;
  color: var(--muted);
  text-align: center;
  font-size: 0.9rem;
  line-height: 1.5;
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
  margin-top: 1.4rem;
}

.info-card {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--bg-soft);
}

.info-card {
  padding: 1.2rem;
}

.info-card h3 {
  margin: 0 0 0.55rem;
  font-family: var(--font-serif);
  font-size: 1.08rem;
  line-height: 1.25;
}

.info-card p {
  margin: 0;
  color: var(--muted);
  font-size: 0.94rem;
  line-height: 1.55;
}

.results-explorer {
  margin-top: 1rem;
  padding: 0.82rem;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--bg-panel);
  box-shadow: var(--shadow);
}

.explorer-header {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(260px, 0.78fr);
  gap: 1rem;
  align-items: end;
  margin-bottom: 0.72rem;
}

.explorer-header h3 {
  margin: 0.2rem 0 0;
  font-family: var(--font-serif);
  font-size: 1.22rem;
  line-height: 1.2;
}

.explorer-header p:last-child {
  margin: 0;
  color: var(--muted);
  font-size: 0.84rem;
  line-height: 1.45;
}

.explorer-controls {
  display: flex;
  justify-content: space-between;
  gap: 0.75rem;
  flex-wrap: wrap;
  margin-bottom: 0.6rem;
}

.segmented-control {
  display: inline-flex;
  padding: 0.18rem;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #f8f6f4;
}

.segmented-control button {
  min-width: 5.6rem;
  border: 0;
  border-radius: 6px;
  background: transparent;
  color: var(--muted);
  cursor: pointer;
  font: inherit;
  font-size: 0.86rem;
  font-weight: 700;
  padding: 0.42rem 0.75rem;
}

.segmented-control button.active {
  color: #fff;
  background: var(--accent);
}

.results-table-wrap {
  overflow-x: auto;
}

.results-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9rem;
  font-variant-numeric: tabular-nums;
}

.results-table th,
.results-table td {
  padding: 0.62rem 0.65rem;
  border-bottom: 1px solid var(--line);
  text-align: right;
  white-space: nowrap;
}

.results-table th:first-child,
.results-table td:first-child {
  text-align: left;
}

.results-table th {
  color: var(--muted);
  font-size: 0.76rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  background: #fbfaf8;
}

.results-table tr.highlight > td {
  background: var(--accent-soft);
}

.method-cell {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.expand-row {
  width: 1.4rem;
  height: 1.4rem;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: #fff;
  color: var(--muted);
  cursor: pointer;
  font: inherit;
  line-height: 1;
}

.expand-row[aria-expanded="true"] {
  color: #fff;
  border-color: var(--accent);
  background: var(--accent);
}

.method-name {
  font-weight: 700;
}

.method-type {
  display: block;
  color: var(--muted);
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.gain-positive {
  color: #287342;
  font-weight: 750;
}

.gain-negative {
  color: #9e3224;
  font-weight: 750;
}

.details-row td {
  padding: 0;
  background: #fbfaf8;
}

.details-panel {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  padding: 0.9rem 1rem 1rem 3.2rem;
}

.detail-block h4 {
  margin: 0 0 0.45rem;
  color: var(--accent-dark);
  font-size: 0.76rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.detail-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(92px, 1fr));
  gap: 0.45rem;
}

.detail-metric {
  padding: 0.48rem 0.55rem;
  border: 1px solid var(--line);
  border-radius: 7px;
  background: #fff;
}

.detail-metric span {
  display: block;
  color: var(--muted);
  font-size: 0.72rem;
  line-height: 1.2;
}

.detail-metric strong {
  display: block;
  margin-top: 0.18rem;
  font-size: 0.98rem;
}

.codebase-card {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 1.5rem;
  align-items: center;
  padding: 1.4rem;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--bg-soft);
  box-shadow: var(--shadow);
}

.codebase-card h2 {
  margin: 0.25rem 0 0.75rem;
  font-family: var(--font-serif);
  font-size: clamp(1.55rem, 3vw, 2.1rem);
  line-height: 1.18;
}

.codebase-card p {
  margin: 0 0 0.65rem;
  color: var(--muted);
}

.codebase-card p:last-child {
  margin-bottom: 0;
}

.codebase-card .star-note {
  display: inline-block;
  margin-top: 0.15rem;
  padding: 0.42rem 0.6rem;
  border: 1px solid rgba(35, 47, 62, 0.14);
  border-radius: 7px;
  color: var(--accent-dark);
  background: rgba(35, 47, 62, 0.05);
  font-weight: 700;
}

.figure-stack {
  margin-top: 1.6rem;
}

.paired-figures {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(280px, 0.86fr);
  gap: 1.2rem;
  align-items: start;
}

.cost-panel img {
  width: min(100%, 760px);
  margin: 0 auto;
}

footer {
  padding: 2rem 0;
  border-top: 1px solid var(--line);
  color: var(--muted);
  text-align: center;
  font-size: 0.9rem;
}

footer p {
  margin: 0;
}

@media (max-width: 1200px) {
  .page-nav {
    display: none;
  }
}

@media (max-width: 840px) {
  body {
    font-size: 16px;
  }

  .hero {
    padding-top: 5rem;
  }

  .brand-logo {
    position: absolute;
    top: 1rem;
    left: 50%;
    width: 122px;
    transform: translateX(-50%);
  }

  .hero h1 {
    font-size: clamp(2rem, 9.5vw, 2.65rem);
    line-height: 1.08;
  }

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

  .paired-figures {
    grid-template-columns: 1fr;
  }

  .explorer-header,
  .details-panel {
    grid-template-columns: 1fr;
  }

  .details-panel {
    padding-left: 1rem;
  }

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

  .codebase-card .button {
    width: 100%;
  }

  .results-explorer {
    padding: 0.75rem;
  }

  .figure-panel {
    padding: 0.7rem;
  }
}