:root {
  color-scheme: light;

  /* Colors (light theme) */
  --color-bg: #F5F7FD;
  --color-surface: #ffffff;
  --color-text: #110022;
  --color-muted: color-mix(in oklab, #110022 65%, #F5F7FD);
  --color-border: #d8dce7;

  --color-accent-trails: #3D3A58; /* dark blue-gray */
  --color-accent-oceans: #0077BE; /* ocean blue */
  --color-header: #0077BE;
  --color-cta: #F9AB55; /* warm orange */
  --color-focus: #F9AB55;

  --color-accent: var(--color-accent-oceans);
  --color-link: var(--color-accent);

  /* Type */
  --font-sans: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial,
    "Apple Color Emoji", "Segoe UI Emoji";
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New",
    monospace;

  --text-xs: 12px;
  --text-sm: 14px;
  --text-md: 16px;
  --text-lg: 18px;
  --text-xl: 22px;

  /* Layout */
  --container: 1100px;
  --content: 760px;

  /* Spacing (4er Raster) */
  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-6: 24px;
  --space-8: 32px;
  --space-12: 48px;
  --space-16: 64px;

  /* Radius / Shadow */
  --radius-sm: 10px;
  --radius-md: 14px;
  --radius-lg: 16px;
  --shadow-sm: 0 1px 2px rgba(15, 23, 42, 0.06), 0 1px 1px rgba(15, 23, 42, 0.04);
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html,
body {
  height: 100%;
}

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: var(--text-md);
  line-height: 1.7;
  color: var(--color-text);
  background: var(--color-bg);
  text-rendering: optimizeLegibility;
}

img {
  max-width: 100%;
  height: auto;
}

a {
  color: var(--color-link);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 0.18em;
}

a:hover {
  text-decoration-thickness: 2px;
}

:focus-visible {
  outline: 2px solid var(--color-focus);
  outline-offset: 2px;
}

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

pre {
  margin: 0;
  padding: var(--space-4);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: color-mix(in oklab, var(--color-surface) 92%, var(--color-text));
  overflow: auto;
}

.oat-page {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 var(--space-4);
}

.oat-topbar {
  position: sticky;
  top: 0;
  z-index: 10;
  background: var(--color-header);
  color: var(--color-bg);
  border-bottom: 1px solid color-mix(in oklab, var(--color-header) 90%, var(--color-text));
  backdrop-filter: blur(8px);
}

.oat-topbar__inner {
  max-width: var(--container);
  margin: 0 auto;
  padding: var(--space-4);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
}

.oat-brand {
  display: flex;
  flex-direction: column;
  line-height: 1.2;
}

.oat-brand__title {
  margin: 0;
  font-size: 15px;
  font-weight: 650;
  letter-spacing: 0.2px;
  color: var(--color-bg);
}

.oat-brand__meta {
  margin: 3px 0 0;
  font-size: var(--text-sm);
  color: color-mix(in oklab, var(--color-bg) 85%, var(--color-header));
}

.oat-nav {
  display: flex;
  gap: var(--space-2);
  flex-wrap: wrap;
  justify-content: flex-end;
}

.oat-pill {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: 9px 12px;
  color: var(--color-bg);
  text-decoration: none;
  font-size: var(--text-sm);
  white-space: nowrap;
  position: relative;
  border: none;
  background: transparent;
  transition: color 140ms ease;
}

.oat-pill:hover {
  color: color-mix(in oklab, var(--color-bg) 80%, var(--color-header));
}

.oat-pill[aria-current="page"] {
  color: var(--color-bg);
  font-weight: 600;
}

.oat-pill[aria-current="page"]::before {
  content: "";
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 48px;
  height: 60px;
  background-image: url("./footprint.svg");
  background-size: contain;
  background-repeat: no-repeat;
  background-position: center;
  opacity: 0.6;
  z-index: -1;
}

.oat-main {
  padding: var(--space-8) 0 var(--space-16);
}

.oat-hero {
  padding: var(--space-8) 0 var(--space-6);
}

.oat-hero h1 {
  margin: 0;
  font-size: clamp(26px, 3.2vw, 40px);
  line-height: 1.15;
  letter-spacing: -0.2px;
}

.oat-hero p {
  margin: var(--space-3) 0 0;
  max-width: var(--content);
  color: var(--color-muted);
}

.oat-section {
  margin-top: var(--space-12);
}

.oat-section h2 {
  margin: 0 0 var(--space-3);
  font-size: clamp(18px, 2vw, 22px);
  line-height: 1.25;
}

.oat-muted {
  color: var(--color-muted);
}

.oat-grid {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: var(--space-4);
}

.oat-card {
  grid-column: span 12;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  background: var(--color-surface);
  box-shadow: var(--shadow-sm);
  overflow: clip;
}

@media (min-width: 760px) {
  .oat-card {
    grid-column: span 6;
  }
}

.oat-card__inner {
  padding: var(--space-4);
}

.oat-card h3 {
  margin: 0 0 var(--space-2);
  font-size: var(--text-lg);
  line-height: 1.25;
}

.oat-card p {
  margin: 0;
  color: var(--color-muted);
  font-size: var(--text-sm);
}

.oat-btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: 10px 12px;
  border: 1px solid var(--color-border);
  border-radius: 999px;
  background: color-mix(in oklab, var(--color-surface) 90%, var(--color-text));
  color: var(--color-text);
  font-size: var(--text-sm);
  line-height: 1.2;
  cursor: pointer;
  text-decoration: none;
  user-select: none;
}

.oat-btn--accent {
  border-color: var(--color-cta);
  background: var(--color-cta);
  color: var(--color-text);
}

.oat-btn:hover {
  border-color: color-mix(in oklab, var(--color-text) 18%, var(--color-border));
}

.oat-chip {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: 6px 10px;
  border-radius: 999px;
  border: 1px solid var(--color-border);
  background: color-mix(in oklab, var(--color-surface) 86%, var(--color-text));
  color: var(--color-muted);
  font-size: var(--text-xs);
}

.oat-field {
  display: grid;
  gap: var(--space-2);
}

.oat-field label {
  font-size: var(--text-sm);
  color: var(--color-muted);
}

.oat-input {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-surface);
  color: var(--color-text);
  font-size: var(--text-md);
}

.oat-input::placeholder {
  color: color-mix(in oklab, var(--color-muted) 75%, var(--color-surface));
}

.oat-swatch {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: clip;
  background: var(--color-surface);
}

.oat-swatch__color {
  height: 84px;
  background: var(--swatch);
}

.oat-swatch__meta {
  padding: var(--space-3);
  display: grid;
  gap: 2px;
  font-size: var(--text-sm);
}

.oat-swatch__name {
  font-weight: 650;
  letter-spacing: 0.1px;
}

.oat-swatch__value {
  color: var(--color-muted);
  font-family: var(--font-mono);
  font-size: 12px;
}

.accent-trails {
  --color-accent: var(--color-accent-trails);
  --color-link: var(--color-accent-trails);
}

.accent-oceans {
  --color-accent: var(--color-accent-oceans);
  --color-link: var(--color-accent-oceans);
}

.oat-icon {
  width: 20px;
  height: 20px;
  stroke: currentColor;
  fill: none;
  stroke-width: 1.75;
  stroke-linecap: round;
  stroke-linejoin: round;
  flex: 0 0 auto;
}

@media (prefers-reduced-motion: no-preference) {
  .oat-pill,
  .oat-btn {
    transition: border-color 140ms ease, transform 140ms ease, box-shadow 140ms ease;
  }
  .oat-btn:active {
    transform: translateY(1px);
  }
}