:root {
  color-scheme: light;

  /* ---- color tokens (see DESIGN.md) ---- */
  --primary: #000000;
  --primary-active: #1a1a1a;
  --text-link: #0d74ce;
  --ink: #171717;
  --body: #60646c;
  --muted: #999999;
  --muted-soft: #cccccc;
  --hairline: #f0f0f3;
  --hairline-soft: #f5f5f7;
  --hairline-strong: #dcdee0;
  --canvas: #ffffff;
  --canvas-soft: #fafafa;
  --surface-card: #ffffff;
  --surface-strong: #f0f0f3;
  --surface-dark: #171717;
  --surface-dark-elevated: #232323;
  --on-primary: #ffffff;
  --on-dark: #ffffff;
  --on-dark-soft: #b0b4ba;
  --sky-light: #cfe7ff;
  --sky-mid: #a8c8e8;
  --success: #16a34a;
  --error: #c0392b;
  --error-soft: #eb8e90;
  --focus-ring: #0d74ce;

  /* ---- type ---- */
  --font-sans: "Inter", -apple-system, system-ui, sans-serif;
  --font-mono: "JetBrains Mono", "Fira Code", monospace;

  /* ---- space (4px base) ---- */
  --space-xxs: 4px;
  --space-xs: 8px;
  --space-sm: 12px;
  --space-base: 16px;
  --space-md: 20px;
  --space-lg: 24px;
  --space-xl: 32px;
  --space-xxl: 48px;
  --space-section: 96px;

  /* ---- radius ---- */
  --r-xs: 4px;
  --r-sm: 6px;
  --r-md: 8px;
  --r-lg: 12px;
  --r-xl: 16px;
  --r-xxl: 24px;
  --r-pill: 9999px;

  --content-max: 1200px;
  --label-col: 9.5rem;
}

* { box-sizing: border-box; min-width: 0; }
[hidden] { display: none !important; }
html { font-size: 100%; scroll-behavior: smooth; }

body {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.5;
  color: var(--ink);
  background: var(--canvas);
  margin: 0;
  font-kerning: normal;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3 { font-family: var(--font-sans); font-weight: 600; color: var(--ink); margin: 0; }
p { margin: 0; }

a { color: var(--text-link); text-decoration: none; }
a:not(.skip-link):not(.btn):hover { text-decoration: underline; text-underline-offset: 0.15em; }

code { font-family: var(--font-mono); font-variant-ligatures: none; }

.section-inner,
.site-header-inner,
.site-footer-inner {
  max-width: var(--content-max);
  margin: 0 auto;
  padding-inline: var(--space-xl);
}

@media (max-width: 640px) {
  .section-inner,
  .site-header-inner,
  .site-footer-inner { padding-inline: var(--space-lg); }
}

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--primary);
  color: var(--on-primary);
  padding: var(--space-xs) var(--space-base);
  border-radius: var(--r-md);
  z-index: 20;
}
.skip-link:focus { left: var(--space-base); top: var(--space-base); }

/* ---------- focus ---------- */

input:focus-visible,
select:focus-visible,
button:focus-visible,
a:focus-visible,
[tabindex]:focus-visible {
  outline: 2px solid var(--focus-ring);
  outline-offset: 2px;
}

/* ========== top navigation ========== */

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  height: 64px;
  display: flex;
  align-items: center;
  background: color-mix(in srgb, var(--canvas) 92%, transparent);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--hairline);
}

.site-header-inner {
  width: 100%;
  display: flex;
  align-items: center;
  gap: var(--space-lg);
}

.brand {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  color: var(--ink);
  margin-right: auto;
}
.brand:hover { text-decoration: none; }

.swiss-mark { width: 24px; height: 24px; flex-shrink: 0; }
.swiss-mark-bg { fill: #c8102e; }
.swiss-mark-fg { fill: #fff; }

.brand-name {
  font-size: 16px;
  font-weight: 600;
  letter-spacing: -0.1px;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: var(--space-lg);
}

.site-nav a {
  color: var(--ink);
  font-size: 14px;
  font-weight: 500;
}

.site-nav a:hover { color: var(--text-link); text-decoration: none; }

.header-actions {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

@media (max-width: 768px) {
  .site-nav { display: none; }
}

@media (max-width: 480px) {
  .header-actions .btn-secondary { display: none; }
}

/* ========== buttons ========== */

.btn {
  font-family: var(--font-sans);
  font-size: 14px;
  font-weight: 500;
  line-height: 1;
  border-radius: var(--r-md);
  padding: 10px 18px;
  height: 40px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-xs);
  border: 1px solid transparent;
  cursor: pointer;
  white-space: nowrap;
  transition: background-color 120ms ease-out, border-color 120ms ease-out, transform 120ms ease-out;
}
.btn:hover { text-decoration: none; }
.btn:active { transform: scale(0.98); }

.btn-primary {
  background: var(--primary);
  color: var(--on-primary);
}
.btn-primary:hover { background: var(--primary-active); }

.btn-secondary {
  background: var(--surface-card);
  color: var(--ink);
  border-color: var(--hairline-strong);
}
.btn-secondary:hover { background: var(--surface-strong); }

.btn-lg { height: 48px; padding: 12px 24px; font-size: 15px; }

button.btn:disabled { opacity: 0.55; cursor: not-allowed; }

.btn-spinner {
  display: none;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  border: 2px solid color-mix(in srgb, var(--on-primary) 35%, transparent);
  border-top-color: var(--on-primary);
  animation: spin 700ms linear infinite;
}
.btn.is-loading .btn-spinner { display: inline-block; }

@keyframes spin { to { transform: rotate(360deg); } }

@media (prefers-reduced-motion: reduce) {
  .btn-spinner { animation: none; opacity: 0.6; }
  html { scroll-behavior: auto; }
  * { transition-duration: 0.01ms !important; }
}

/* ========== badges ========== */

.badge-pill {
  display: inline-flex;
  align-items: center;
  background: var(--surface-strong);
  color: var(--ink);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.88px;
  text-transform: uppercase;
  border-radius: var(--r-pill);
  padding: 4px 10px;
  margin-bottom: var(--space-base);
}

/* ========== hero ========== */

.hero {
  position: relative;
  padding-block: var(--space-xxl) var(--space-section);
  overflow: hidden;
}

.hero-atmosphere {
  position: absolute;
  inset: -20% -10% auto -10%;
  height: 640px;
  background: radial-gradient(ellipse 60% 55% at 50% 0%, var(--sky-light) 0%, var(--sky-mid) 45%, transparent 75%);
  opacity: 0.55;
  pointer-events: none;
  z-index: 0;
}

.hero-inner {
  position: relative;
  z-index: 1;
  max-width: var(--content-max);
  margin: 0 auto;
  padding-inline: var(--space-xl);
  display: grid;
  gap: var(--space-xxl);
  align-items: center;
}

.hero-copy { max-width: 46rem; }

.hero h1 {
  font-size: 64px;
  font-weight: 600;
  line-height: 1.05;
  letter-spacing: -1.92px;
  text-wrap: balance;
  margin-bottom: var(--space-lg);
}

.hero-lead {
  font-size: 18px;
  line-height: 1.5;
  color: var(--body);
  max-width: 44rem;
  margin-bottom: var(--space-xl);
}

.hero-actions {
  display: flex;
  gap: var(--space-sm);
  flex-wrap: wrap;
}

.hero-preview { max-width: 640px; }

.hero-preview .code-block {
  border-radius: var(--r-xl);
  box-shadow: 0 20px 45px -20px rgba(23, 23, 23, 0.35);
}

@media (max-width: 1024px) {
  .hero h1 { font-size: 48px; letter-spacing: -1.44px; }
}

@media (max-width: 640px) {
  .hero h1 { font-size: 32px; letter-spacing: -0.8px; }
  .hero-lead { font-size: 16px; }
  .hero { padding-block: var(--space-xl) var(--space-xxl); }
}

/* ========== sections ========== */

.section { padding-block: var(--space-section); border-bottom: 1px solid var(--hairline); }
.section-soft { background: var(--canvas-soft); }

.section h2 {
  font-size: 36px;
  line-height: 1.15;
  letter-spacing: -1.08px;
  margin-bottom: var(--space-base);
}

.section-lead {
  color: var(--body);
  font-size: 16px;
  max-width: 60ch;
  margin-bottom: var(--space-xl);
}

.section-inner h3 {
  font-size: 16px;
  font-weight: 600;
  margin: var(--space-xl) 0 var(--space-sm);
}
.section-inner h3:first-of-type { margin-top: var(--space-lg); }

.hint { color: var(--muted); font-size: 14px; margin-top: var(--space-base); }

@media (max-width: 640px) {
  .section { padding-block: var(--space-xxl); }
  .section h2 { font-size: 28px; letter-spacing: -0.84px; }
}

/* ========== cards ========== */

.card {
  background: var(--surface-card);
  border: 1px solid var(--hairline-strong);
  border-radius: var(--r-lg);
}

/* ========== code blocks ========== */

.code-block {
  position: relative;
  background: var(--surface-strong);
  border-radius: var(--r-lg);
  padding: var(--space-md);
}

.code-block pre {
  margin: 0;
  overflow-x: auto;
  white-space: pre-wrap;
  word-break: break-word;
}

.code-block code {
  font-size: 13px;
  line-height: 1.6;
  color: var(--ink);
}

.code-block-dark {
  background: var(--surface-dark);
}
.code-block-dark code { color: var(--on-dark); }

.quickstart-grid {
  display: grid;
  gap: var(--space-lg);
  margin-bottom: var(--space-base);
}

@media (min-width: 900px) {
  .quickstart-grid { grid-template-columns: 1fr 1fr; }
}

.copy-btn {
  position: absolute;
  top: var(--space-sm);
  right: var(--space-sm);
  background: var(--surface-dark-elevated);
  color: var(--on-dark-soft);
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: var(--r-sm);
  font-family: var(--font-sans);
  font-size: 12px;
  font-weight: 500;
  padding: 5px 10px;
  cursor: pointer;
}
.copy-btn:hover { background: var(--primary); color: var(--on-dark); }
.copy-btn.copied { border-color: var(--success); color: var(--success); background: var(--surface-dark-elevated); }

.tok-key { color: #9cdcfe; }
.tok-string { color: #7fe0a8; }
.tok-number { color: #f0a868; }
.tok-bool { color: #6cb0ff; }
.tok-cmd { color: #ff8a80; font-weight: 600; }
.tok-flag { color: #f0a868; }

/* code-block (light) needs darker token colors for contrast on white/near-white bg */
.code-block:not(.code-block-dark) .tok-key { color: #7a3e9d; }
.code-block:not(.code-block-dark) .tok-string { color: #0a7a3d; }
.code-block:not(.code-block-dark) .tok-number { color: #a1530a; }
.code-block:not(.code-block-dark) .tok-bool { color: #0a5fd1; }
.code-block:not(.code-block-dark) .tok-cmd { color: var(--error); font-weight: 600; }
.code-block:not(.code-block-dark) .tok-flag { color: #a1530a; }

/* ========== inline code & collapsible examples ========== */

.section-inner p code, .hint code {
  background: var(--surface-strong);
  border-radius: var(--r-xs);
  padding: 2px 5px;
  font-size: 0.9em;
}

.examples-toggle {
  margin-top: var(--space-lg);
  border: 1px solid var(--hairline-strong);
  border-radius: var(--r-lg);
  padding: var(--space-base) var(--space-lg);
}

.examples-toggle summary {
  cursor: pointer;
  font-size: 14px;
  font-weight: 500;
  color: var(--ink);
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-sm);
}

.examples-toggle summary::-webkit-details-marker { display: none; }

.examples-toggle summary::after {
  content: "";
  width: 7px;
  height: 7px;
  border-right: 2px solid var(--muted);
  border-bottom: 2px solid var(--muted);
  transform: rotate(45deg);
  transition: transform 150ms ease-out;
  flex-shrink: 0;
}

.examples-toggle[open] summary::after { transform: rotate(-135deg); }

.examples-toggle-body {
  display: grid;
  gap: var(--space-base);
  margin-top: var(--space-lg);
}

/* ========== try-it / form ========== */

.form-intro {
  color: var(--body);
  margin: 0 0 var(--space-lg);
  font-size: 14px;
}

.try-it-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-lg);
  align-items: start;
}

.form-card { padding: var(--space-xl); }

fieldset {
  border: 0;
  margin: 0;
  padding: var(--space-lg) 0;
  border-top: 1px solid var(--hairline);
  min-width: 0;
}
fieldset:first-of-type { border-top: 0; padding-top: 0; }

legend {
  display: block;
  padding: 0 0 var(--space-base);
  font-size: 13px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--muted);
  float: none;
  width: auto;
}

.fieldset-fields {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: var(--space-base) var(--space-lg);
  align-content: start;
}

.field {
  display: flex;
  flex-direction: column;
  gap: var(--space-xxs);
}

.field label,
.field-label-static {
  font-size: 14px;
  font-weight: 500;
  color: var(--ink);
}

.req { color: var(--error); }

.checkbox-label,
.radio-label {
  display: flex;
  flex-direction: row;
  align-items: center;
  gap: var(--space-xs);
  font-size: 14px;
  padding-block: var(--space-xs);
  min-height: 44px;
}

.checkbox-label input,
.radio-label input {
  width: 18px;
  height: 18px;
  flex-shrink: 0;
  accent-color: var(--primary);
}

.format-field .format-options {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-base);
}

input, select {
  font-family: var(--font-sans);
  padding: 12px 14px;
  border: 1px solid var(--hairline-strong);
  border-radius: var(--r-md);
  font-size: 14px;
  min-height: 44px;
  background: var(--surface-card);
  color: var(--ink);
}

input:focus-visible, select:focus-visible {
  border-color: var(--ink);
  outline: none;
  box-shadow: 0 0 0 1px var(--ink);
}

input[aria-invalid="true"] { border-color: var(--error); border-width: 2px; }

.field-error {
  color: var(--error);
  font-size: 12px;
  min-height: 1.2em;
}

.form-actions {
  display: flex;
  align-items: center;
  gap: var(--space-base);
  flex-wrap: wrap;
  margin-top: var(--space-xl);
  padding-top: var(--space-lg);
  border-top: 1px solid var(--hairline);
}

.form-error { color: var(--error); font-weight: 500; font-size: 14px; margin: 0; }

/* ---------- result ---------- */

.result-panel {
  padding: var(--space-lg);
  min-height: 12rem;
}

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

.result-card { outline: none; }

.result-header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--space-xs);
  margin-bottom: var(--space-base);
  padding-bottom: var(--space-base);
  border-bottom: 1px solid var(--hairline);
}

.result-header h3 {
  margin: 0;
  font-size: 14px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--muted);
}

.download-link {
  border: 1px solid var(--hairline-strong);
  border-radius: var(--r-sm);
  padding: 6px 12px;
  font-size: 12px;
  font-weight: 500;
  text-decoration: none;
  color: var(--ink);
  font-variant-numeric: tabular-nums;
}
.download-link:hover { background: var(--primary); color: var(--on-primary); border-color: var(--primary); text-decoration: none; }

.result-card img,
.result-card embed {
  max-width: 100%;
  display: block;
  border: 1px solid var(--hairline);
  border-radius: var(--r-md);
}

/* ========== CTA band ========== */

.cta-band {
  padding-block: var(--space-section);
  text-align: center;
}

.cta-band h2 {
  font-size: 36px;
  letter-spacing: -1.08px;
  margin-bottom: var(--space-base);
}

.cta-band .section-lead { margin: 0 auto var(--space-xl); }

.cta-band .btn { margin: 0 auto; }

/* ========== footer ========== */

.site-footer {
  background: var(--canvas);
  border-top: 1px solid var(--hairline);
  padding-block: var(--space-xl);
}

.site-footer p {
  color: var(--body);
  font-size: 14px;
}