style.css

/* Modernized styles for graph.html and related pages */
:root {
  color-scheme: light dark;
  --font-sans: "Inter", "Segoe UI", "Helvetica Neue", Arial, sans-serif;
  --font-mono: "Fira Code", "SFMono-Regular", "Consolas", monospace;
  --color-bg: #eef2ff;
  --color-surface: rgba(255, 255, 255, 0.92);
  --color-text: #1f2937;
  --color-muted: #64748b;
  --color-primary: #2563eb;
  --color-border: rgba(15, 23, 42, 0.12);
  --color-code-bg: #111827;
  --shadow-lg: 0 28px 60px -35px rgba(15, 23, 42, 0.55);
  --radius-lg: 18px;
  --radius-md: 12px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --color-bg: #0f172a;
    --color-surface: rgba(15, 23, 42, 0.82);
    --color-text: #e2e8f0;
    --color-muted: #94a3b8;
    --color-primary: #60a5fa;
    --color-border: rgba(148, 163, 184, 0.28);
    --color-code-bg: #020617;
    --shadow-lg: 0 28px 60px -30px rgba(2, 6, 23, 0.8);
  }
}

html {
  min-height: 100%;
  background: radial-gradient(130% 130% at 20% 20%, #dbeafe 0%, #eef2ff 40%, #f9fafb 100%);
}

@media (prefers-color-scheme: dark) {
  html {
    background: radial-gradient(130% 130% at 20% 20%, #1e293b 0%, #0f172a 55%, #020617 100%);
  }
}

body {
  margin: 0 auto;
  max-width: 960px;
  min-height: 100vh;
  padding: clamp(2.5rem, 6vw, 4rem) clamp(1.5rem, 5vw, 3.5rem);
  font-family: var(--font-sans);
  line-height: 1.7;
  color: var(--color-text);
  background: var(--color-surface);
  box-shadow: var(--shadow-lg);
  border-radius: var(--radius-lg);
  backdrop-filter: saturate(150%) blur(18px);
  -webkit-backdrop-filter: saturate(150%) blur(18px);
}

.hero {
  display: flex;
  flex-direction: column;
  gap: 1.4rem;
  align-items: flex-start;
  padding-bottom: 2rem;
  border-bottom: 1px solid var(--color-border);
}

.hero__eyebrow {
  font-size: 0.85rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--color-muted);
}

.hero__lead {
  max-width: 52ch;
  color: var(--color-muted);
}

.hero__actions {
  display: flex;
  gap: 0.8rem;
  flex-wrap: wrap;
  align-items: center;
}

.hero__meta {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 0.75rem 1.5rem;
  margin: 0;
}

.hero__meta dt {
  font-size: 0.8rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-muted);
}

.hero__meta dd {
  margin: 0.2rem 0 0;
  font-weight: 600;
  color: var(--color-text);
}

.hero__meta a {
  color: var(--color-primary);
  text-decoration: none;
}

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

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  padding: 0.65rem 1.2rem;
  border-radius: 999px;
  font-weight: 600;
  font-size: 0.95rem;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
  border: 1px solid transparent;
  cursor: pointer;
}

.button-primary {
  background: linear-gradient(135deg, var(--color-primary), rgba(37, 99, 235, 0.8));
  color: #fff;
  box-shadow: 0 12px 24px -16px rgba(37, 99, 235, 0.8);
}

.button-ghost {
  background: transparent;
  color: var(--color-primary);
  border-color: rgba(37, 99, 235, 0.4);
}

.button:hover,
.button:focus-visible {
  transform: translateY(-1px);
  box-shadow: 0 20px 24px -18px rgba(37, 99, 235, 0.45);
}

.feature-grid {
  margin-top: 3rem;
}

.feature-grid + .feature-grid {
  margin-top: 4rem;
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1.5rem;
  align-items: stretch;
}

.card {
  display: flex;
  flex-direction: column;
  background: rgba(255, 255, 255, 0.75);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 1.6rem;
  box-shadow: 0 16px 32px -28px rgba(15, 23, 42, 0.6);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: 0 26px 42px -30px rgba(15, 23, 42, 0.65);
}

.card h3 {
  margin-top: 0;
  font-size: 1.2rem;
}

.card p {
  margin-bottom: 1rem;
}

.card ul {
  margin-top: auto;
  color: var(--color-muted);
}

.card ul li + li {
  margin-top: 0.4rem;
}

.callout {
  margin-top: 3.5rem;
  padding: 1.5rem 1.8rem;
  border-radius: var(--radius-md);
  background: linear-gradient(135deg, rgba(37, 99, 235, 0.12), rgba(37, 99, 235, 0.24));
  border: 1px solid rgba(37, 99, 235, 0.25);
  box-shadow: 0 20px 32px -28px rgba(37, 99, 235, 0.45);
}

.callout ul {
  margin: 1rem 0 0;
  padding-left: 1.2rem;
  color: var(--color-muted);
}

.callout li + li {
  margin-top: 0.35rem;
}

.callout a {
  color: var(--color-text);
  font-weight: 600;
  text-decoration: none;
}

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

.code-card {
  margin-top: 3rem;
  background: rgba(15, 23, 42, 0.92);
  color: #f8fafc;
  border: none;
}

.code-card h2 {
  color: #f8fafc;
  border-color: rgba(255, 255, 255, 0.12);
}

.code-card p {
  color: rgba(226, 232, 240, 0.82);
}

.code-card pre {
  margin-top: 1.5rem;
}

h1, h2, h3, h4, h5, h6 {
  color: var(--color-text);
  font-weight: 650;
  margin: 2.4rem 0 1rem;
  letter-spacing: -0.01em;
}

h1 {
  font-size: clamp(2.2rem, 3vw, 2.8rem);
  margin-top: 0;
}

h2 {
  font-size: clamp(1.6rem, 2.5vw, 2rem);
  border-bottom: 1px solid var(--color-border);
  padding-bottom: 0.4rem;
}

.feature-grid h2 {
  margin-top: 0;
}

.feature-grid h2 + .grid {
  margin-top: 1.5rem;
}

h3 {
  font-size: clamp(1.3rem, 2vw, 1.6rem);
}

p {
  margin: 0 0 1.4rem;
  color: var(--color-text);
}

p + p {
  margin-top: -0.6rem;
}

a {
  color: var(--color-primary);
  text-decoration: none;
  font-weight: 600;
}

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

a:focus-visible,
button:focus-visible,
[tabindex]:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 3px;
  border-radius: 6px;
}

ul,
ol {
  padding-left: 1.5rem;
  margin: 0 0 1.4rem;
}

li + li {
  margin-top: 0.4rem;
}

blockquote {
  margin: 1.8rem 0;
  padding: 1rem 1.2rem;
  border-left: 4px solid var(--color-primary);
  background: rgba(37, 99, 235, 0.08);
  color: var(--color-muted);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
}

hr {
  border: none;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--color-border), transparent);
  margin: 2.5rem 0;
}

code,
pre,
kbd {
  font-family: var(--font-mono);
}

code {
  background: rgba(15, 23, 42, 0.08);
  color: var(--color-primary);
  padding: 0.2rem 0.5rem;
  border-radius: 6px;
  font-size: 0.925em;
}

pre {
  background: var(--color-code-bg);
  color: #f8fafc;
  padding: 1.4rem;
  border-radius: var(--radius-md);
  overflow: auto;
  margin: 2rem 0;
  box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.04);
}

pre code {
  background: transparent;
  color: inherit;
  padding: 0;
  font-size: 0.95em;
}

table {
  width: 100%;
  border-collapse: collapse;
  margin: 2rem 0;
  background: rgba(255, 255, 255, 0.85);
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
  overflow: hidden;
  box-shadow: 0 12px 24px -20px rgba(15, 23, 42, 0.5);
}

table thead {
  background: linear-gradient(135deg, rgba(37, 99, 235, 0.12), rgba(37, 99, 235, 0.24));
  color: var(--color-text);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  font-size: 0.85rem;
}

table th,
table td {
  border-bottom: 1px solid var(--color-border);
  padding: 0.85rem 1rem;
  text-align: left;
}

table tbody tr:nth-of-type(even) {
  background: rgba(37, 99, 235, 0.04);
}

figure {
  margin: 2.5rem auto;
}

img {
  display: block;
  max-width: 100%;
  height: auto;
  border-radius: var(--radius-md);
  box-shadow: 0 20px 40px -30px rgba(15, 23, 42, 0.6);
}

caption,
figcaption {
  margin-top: 0.75rem;
  text-align: center;
  color: var(--color-muted);
  font-size: 0.95rem;
}

dt {
  font-weight: 600;
  margin-top: 1rem;
}

dd {
  margin: 0.2rem 0 0.8rem 1.2rem;
  color: var(--color-muted);
}

kbd {
  background: rgba(15, 23, 42, 0.08);
  padding: 0.3rem 0.5rem;
  border-radius: 6px;
  border: 1px solid rgba(15, 23, 42, 0.15);
  font-size: 0.85em;
}

footer {
  margin-top: 3rem;
  border-top: 1px solid var(--color-border);
  padding-top: 1.5rem;
  color: var(--color-muted);
  font-size: 0.9rem;
}

@media (max-width: 720px) {
  body {
    padding: clamp(1.8rem, 6vw, 3rem) clamp(1rem, 5vw, 2.2rem);
    border-radius: 0;
    box-shadow: none;
  }

  table {
    display: block;
    overflow-x: auto;
    white-space: nowrap;
  }
}