:root {
  --bg: #f4f1ea;
  --bg-strong: #ece6dc;
  --surface: rgba(255, 255, 255, 0.72);
  --surface-strong: rgba(255, 255, 255, 0.9);
  --border: #d8d0c3;
  --text: #16212b;
  --muted: #52606d;
  --accent: #0e586c;
  --accent-strong: #0a4352;
  --code-bg: #f8f7f3;
  --shadow: 0 18px 40px rgba(19, 28, 35, 0.08);
  --nav-surface: rgba(255, 255, 255, 0.55);
  --nav-surface-active: rgba(14, 88, 108, 0.09);
  --panel-surface: rgba(248, 246, 241, 0.8);
  --card-surface: rgba(255, 255, 255, 0.62);
  --input-surface: rgba(255, 255, 255, 0.92);
  --toggle-surface: rgba(255, 255, 255, 0.78);
  --button-secondary-surface: rgba(255, 255, 255, 0.72);
  --button-secondary-surface-hover: rgba(14, 88, 108, 0.1);
  --interactive-border: linear-gradient(135deg, rgba(14, 88, 108, 0.22), rgba(14, 88, 108, 0.08) 45%, rgba(255, 255, 255, 0.28));
  --interactive-border-strong: linear-gradient(135deg, rgba(14, 88, 108, 0.42), rgba(14, 88, 108, 0.16) 45%, rgba(255, 255, 255, 0.45));
  --hover-shadow: 0 18px 36px rgba(19, 28, 35, 0.12);
  --hover-shadow-strong: 0 22px 44px rgba(19, 28, 35, 0.16);
  --radius: 20px;
}

html {
  color-scheme: light;
}

html[data-theme="dark"] {
  color-scheme: dark;
  --bg: #111a22;
  --bg-strong: #16232d;
  --surface: rgba(18, 28, 36, 0.82);
  --surface-strong: rgba(26, 37, 46, 0.94);
  --border: #304450;
  --text: #e6eef2;
  --muted: #aabac4;
  --accent: #76b8ca;
  --accent-strong: #9dd2df;
  --code-bg: #16212a;
  --shadow: 0 18px 40px rgba(0, 0, 0, 0.28);
  --nav-surface: rgba(18, 28, 36, 0.72);
  --nav-surface-active: rgba(118, 184, 202, 0.16);
  --panel-surface: rgba(17, 26, 34, 0.9);
  --card-surface: rgba(19, 30, 39, 0.8);
  --input-surface: rgba(16, 26, 34, 0.92);
  --toggle-surface: rgba(19, 30, 39, 0.88);
  --button-secondary-surface: rgba(22, 34, 43, 0.88);
  --button-secondary-surface-hover: rgba(118, 184, 202, 0.18);
  --interactive-border: linear-gradient(135deg, rgba(118, 184, 202, 0.26), rgba(118, 184, 202, 0.08) 45%, rgba(255, 255, 255, 0.12));
  --interactive-border-strong: linear-gradient(135deg, rgba(157, 210, 223, 0.54), rgba(118, 184, 202, 0.18) 45%, rgba(255, 255, 255, 0.2));
  --hover-shadow: 0 18px 36px rgba(0, 0, 0, 0.3);
  --hover-shadow-strong: 0 22px 44px rgba(0, 0, 0, 0.38);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  position: relative;
  min-height: 100vh;
  margin: 0;
  color: var(--text);
  background: var(--bg);
  font: 400 1rem/1.7 "IBM Plex Sans", "Segoe UI", sans-serif;
  transition: background-color 180ms ease, color 180ms ease;
  isolation: isolate;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background:
    radial-gradient(circle at top left, rgba(14, 88, 108, 0.11), transparent 34%),
    radial-gradient(circle at top right, rgba(22, 33, 43, 0.08), transparent 28%),
    linear-gradient(180deg, #f9f6f0 0%, var(--bg) 100%);
}

html[data-theme="dark"] body::before {
  background:
    radial-gradient(circle at top left, rgba(118, 184, 202, 0.13), transparent 34%),
    radial-gradient(circle at top right, rgba(5, 10, 14, 0.42), transparent 30%),
    linear-gradient(180deg, #17232d 0%, var(--bg) 100%);
}

.skip-link {
  position: absolute;
  left: -999px;
  top: 0;
}

.skip-link:focus {
  left: 1rem;
  top: 1rem;
  z-index: 10;
  padding: 0.75rem 1rem;
  border-radius: 999px;
  background: var(--accent-strong);
  color: #fff;
}

a {
  color: var(--accent);
  text-decoration-thickness: 0.08em;
  text-underline-offset: 0.18em;
}

a:hover,
a:focus-visible {
  color: var(--accent-strong);
}

img {
  display: block;
  max-width: 100%;
  height: auto;
  border-radius: calc(var(--radius) - 6px);
}

.site-shell {
  width: min(72rem, calc(100vw - 2rem));
  margin: 0 auto;
  padding: 1.25rem 0 4rem;
}

.site-header {
  display: grid;
  gap: 1.5rem;
  padding: 1rem 0 2.25rem;
}

.header-controls {
  display: flex;
  justify-content: flex-end;
}

.brand-block {
  display: grid;
  gap: 0.45rem;
}

.site-title {
  margin: 0;
  font: 600 clamp(1.85rem, 4vw, 2.8rem)/1.05 "Source Serif 4", Georgia, serif;
  letter-spacing: -0.02em;
}

.site-title a {
  color: inherit;
  text-decoration: none;
}

.site-tagline {
  margin: 0;
  max-width: 48rem;
  color: var(--muted);
}

.site-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.55rem;
}

.site-nav a {
  display: inline-flex;
  align-items: center;
  min-height: 2.5rem;
  padding: 0.55rem 0.95rem;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--nav-surface);
  color: var(--text);
  text-decoration: none;
  transition: transform 180ms ease, border-color 180ms ease, background 180ms ease, color 180ms ease, box-shadow 180ms ease;
}

.site-nav a.is-active,
.site-nav a:hover,
.site-nav a:focus-visible {
  border-color: rgba(14, 88, 108, 0.28);
  background: var(--nav-surface-active);
  color: var(--accent-strong);
}

.theme-toggle {
  min-height: 2.5rem;
  padding: 0.55rem 0.95rem;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--toggle-surface);
  color: var(--text);
  box-shadow: 0 0 0 rgba(0, 0, 0, 0);
  transition: transform 180ms ease, border-color 180ms ease, background 180ms ease, color 180ms ease, box-shadow 180ms ease;
}

.theme-toggle:hover,
.theme-toggle:focus-visible {
  border-color: rgba(14, 88, 108, 0.28);
  background: var(--nav-surface-active);
  color: var(--accent-strong);
}

.site-main {
  display: grid;
  gap: 2.5rem;
}

.site-footer {
  margin-top: 4rem;
  padding-top: 1.25rem;
  border-top: 1px solid var(--border);
  color: var(--muted);
  font-size: 0.95rem;
}

.hero,
.page-shell,
.article-entry {
  padding: clamp(1.4rem, 3vw, 2.25rem);
  border: 1px solid rgba(216, 208, 195, 0.9);
  border-radius: var(--radius);
  background: linear-gradient(180deg, var(--surface-strong) 0%, var(--surface) 100%);
  box-shadow: var(--shadow);
  backdrop-filter: blur(8px);
}

.hero {
  display: grid;
  gap: 2rem;
  grid-template-columns: minmax(0, 1.5fr) minmax(18rem, 1fr);
}

.hero-summary,
.page-lede {
  max-width: 42rem;
  color: var(--muted);
  font-size: 1.05rem;
}

.hero-actions,
.profile-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.8rem;
}

.button-link,
button,
.button-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 2.75rem;
  padding: 0.7rem 1rem;
  border-radius: 999px;
  border: 1px solid transparent;
  font: inherit;
  cursor: pointer;
  text-decoration: none;
  box-shadow: 0 0 0 rgba(0, 0, 0, 0);
  transition: transform 180ms ease, border-color 180ms ease, background 180ms ease, color 180ms ease, box-shadow 180ms ease;
}

.button-link,
button {
  background: var(--accent);
  color: #fff;
}

.button-link:hover,
.button-link:focus-visible,
button:hover,
button:focus-visible {
  background: var(--accent-strong);
  color: #fff;
}

.button-secondary {
  border-color: var(--border);
  background: var(--button-secondary-surface);
  color: var(--text);
}

.button-secondary:hover,
.button-secondary:focus-visible {
  border-color: rgba(14, 88, 108, 0.28);
  background: var(--button-secondary-surface-hover);
  color: var(--accent-strong);
}

.hero-panel {
  padding: 1.2rem;
  border: 1px solid transparent;
  border-radius: calc(var(--radius) - 4px);
  background:
    linear-gradient(180deg, var(--panel-surface) 0%, var(--panel-surface) 100%) padding-box,
    var(--interactive-border) border-box;
  box-shadow: 0 0 0 rgba(0, 0, 0, 0);
  transition: transform 220ms ease, box-shadow 220ms ease, background 220ms ease;
}

.eyebrow {
  margin: 0 0 0.85rem;
  color: var(--accent-strong);
  font-size: 0.82rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

h1,
h2,
h3,
h4,
h5,
h6 {
  margin: 0 0 0.9rem;
  font-family: "Source Serif 4", Georgia, serif;
  line-height: 1.1;
  letter-spacing: -0.015em;
}

h1 {
  font-size: clamp(2.4rem, 5vw, 4.25rem);
}

h2 {
  font-size: clamp(1.55rem, 3vw, 2rem);
}

h3 {
  font-size: clamp(1.2rem, 2.2vw, 1.45rem);
}

p,
ul,
ol,
dl,
table,
pre,
blockquote {
  margin: 0 0 1.1rem;
}

ul,
ol {
  padding-left: 1.3rem;
}

li + li {
  margin-top: 0.45rem;
}

code,
pre,
kbd {
  font-family: "IBM Plex Mono", "SFMono-Regular", Consolas, monospace;
}

code {
  padding: 0.1rem 0.35rem;
  border-radius: 0.35rem;
  background: var(--code-bg);
  font-size: 0.92em;
}

pre {
  overflow-x: auto;
  padding: 1rem 1.15rem;
  border: 1px solid var(--border);
  border-radius: 1rem;
  background: var(--code-bg);
}

blockquote {
  padding-left: 1rem;
  border-left: 3px solid rgba(14, 88, 108, 0.35);
  color: var(--muted);
}

hr {
  border: 0;
  border-top: 1px solid var(--border);
  margin: 2rem 0;
}

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

th,
td {
  padding: 0.7rem 0.85rem;
  text-align: left;
  border-bottom: 1px solid var(--border);
}

.page-header {
  margin-bottom: 2rem;
}

.prose > :last-child,
.card > :last-child,
.hero-panel > :last-child,
.page-shell > :last-child,
.article-entry > :last-child {
  margin-bottom: 0;
}

.card-grid,
.two-column-grid,
.list-grid {
  display: grid;
  gap: 1rem;
}

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

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

.card,
.list-card,
.callout,
.demo-panel {
  padding: 1.15rem;
  border: 1px solid transparent;
  border-radius: 1.1rem;
  background:
    linear-gradient(180deg, var(--card-surface) 0%, var(--card-surface) 100%) padding-box,
    var(--interactive-border) border-box;
  box-shadow: 0 0 0 rgba(0, 0, 0, 0);
  transition: transform 220ms ease, box-shadow 220ms ease, background 220ms ease;
}

.card h2 a,
.list-card h2 a {
  transition: color 180ms ease;
}

.compact-list,
.link-list {
  margin: 0;
  padding-left: 1.1rem;
}

.article-meta,
.small-note,
.status-note {
  color: var(--muted);
  font-size: 0.95rem;
}

.article-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.9rem;
  margin-bottom: 1rem;
}

.label {
  display: block;
  margin-bottom: 0.55rem;
  font-weight: 600;
}

textarea,
input {
  width: 100%;
  padding: 0.85rem 0.95rem;
  border: 1px solid var(--border);
  border-radius: 0.9rem;
  background: var(--input-surface);
  color: var(--text);
  font: inherit;
}

textarea {
  min-height: 12rem;
  resize: vertical;
}

.demo-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.8rem;
  margin: 1rem 0 1.25rem;
}

.numeric-output {
  white-space: pre-wrap;
}

.inline-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.8rem;
  padding: 0;
  list-style: none;
}

.inline-list li {
  margin: 0;
}

.back-link {
  margin-top: 2rem;
}

@media (hover: hover) and (pointer: fine) {
  .site-nav a:hover,
  .site-nav a:focus-visible,
  .theme-toggle:hover,
  .theme-toggle:focus-visible,
  .button-link:hover,
  .button-link:focus-visible,
  button:hover,
  button:focus-visible,
  .button-secondary:hover,
  .button-secondary:focus-visible {
    transform: translateY(-1px) scale(1.01);
    box-shadow: var(--hover-shadow);
  }

  .card:hover,
  .card:focus-within,
  .list-card:hover,
  .list-card:focus-within,
  .callout:hover,
  .callout:focus-within,
  .demo-panel:hover,
  .demo-panel:focus-within,
  .hero-panel:hover,
  .hero-panel:focus-within {
    transform: translateY(-3px);
    box-shadow: var(--hover-shadow-strong);
    background:
      linear-gradient(180deg, var(--card-surface) 0%, var(--card-surface) 100%) padding-box,
      var(--interactive-border-strong) border-box;
  }

  .hero-panel:hover,
  .hero-panel:focus-within {
    background:
      linear-gradient(180deg, var(--panel-surface) 0%, var(--panel-surface) 100%) padding-box,
      var(--interactive-border-strong) border-box;
  }
}

@media (prefers-reduced-motion: reduce) {
  .site-nav a,
  .theme-toggle,
  .button-link,
  button,
  .button-secondary,
  .hero-panel,
  .card,
  .list-card,
  .callout,
  .demo-panel,
  .card h2 a,
  .list-card h2 a {
    transition: none;
  }
}

@media (max-width: 900px) {
  .hero,
  .card-grid,
  .two-column-grid,
  .list-grid {
    grid-template-columns: 1fr;
  }

  .site-shell {
    width: min(100vw - 1rem, 72rem);
  }
}

@media (max-width: 640px) {
  body {
    font-size: 0.98rem;
  }

  .site-shell {
    width: min(100vw - 0.75rem, 72rem);
    padding-bottom: 2.5rem;
  }

  .hero,
  .page-shell,
  .article-entry {
    padding: 1.15rem;
    border-radius: 1.2rem;
  }

  .site-nav {
    gap: 0.45rem;
  }

  .header-controls {
    justify-content: flex-start;
  }

  .site-nav a {
    padding-inline: 0.8rem;
  }
}

@media print {
  body {
    background: #fff;
  }

  body::before {
    display: none;
  }

  .header-controls,
  .site-nav,
  .hero-actions,
  .profile-links,
  .demo-actions {
    display: none;
  }
}