:root {
  --font-display: 'Cabinet Grotesk', 'Satoshi', sans-serif;
  --font-body: 'Satoshi', 'Inter', sans-serif;
  --font-mono: 'JetBrains Mono', ui-monospace, monospace;

  --text-xs: clamp(0.75rem, 0.72rem + 0.15vw, 0.8125rem);
  --text-sm: clamp(0.875rem, 0.84rem + 0.18vw, 0.9375rem);
  --text-base: clamp(1rem, 0.97rem + 0.15vw, 1.0625rem);
  --text-lg: clamp(1.125rem, 1.05rem + 0.4vw, 1.375rem);
  --text-xl: clamp(1.5rem, 1.3rem + 1vw, 2rem);
  --text-2xl: clamp(2rem, 1.5rem + 2.4vw, 3.25rem);
  --text-hero: clamp(2.5rem, 1.6rem + 4.2vw, 5rem);

  --space-1: 0.25rem; --space-2: 0.5rem; --space-3: 0.75rem; --space-4: 1rem;
  --space-5: 1.25rem; --space-6: 1.5rem; --space-8: 2rem; --space-10: 2.5rem;
  --space-12: 3rem; --space-16: 4rem; --space-20: 5rem; --space-24: 6rem;

  --color-bg: oklch(0.975 0.004 90);
  --color-surface: oklch(0.995 0.002 90);
  --color-surface-2: oklch(0.955 0.005 90);
  --color-text: oklch(0.2 0.01 260);
  --color-muted: oklch(0.47 0.012 260);
  --color-faint: oklch(0.62 0.01 260);
  --color-border: oklch(0.2 0.01 260 / 0.1);
  --color-border-strong: oklch(0.2 0.01 260 / 0.2);
  --color-primary: oklch(0.52 0.19 262);
  --color-primary-hover: oklch(0.45 0.19 262);
  --color-on-primary: oklch(0.99 0 0);

  --radius-sm: 6px; --radius-md: 10px; --radius-lg: 16px; --radius-xl: 24px;
  --shadow-sm: 0 1px 2px oklch(0.2 0.02 260 / 0.06);
  --shadow-md: 0 4px 16px oklch(0.2 0.02 260 / 0.07), 0 1px 3px oklch(0.2 0.02 260 / 0.05);
  --shadow-lg: 0 24px 60px -20px oklch(0.2 0.03 260 / 0.25);
  --ease: cubic-bezier(0.16, 1, 0.3, 1);
  --transition-interactive: 180ms var(--ease);
  --content: 1180px;
}

body { overflow-x: hidden; }
a { color: inherit; }
.wrap { width: min(100% - 2 * var(--space-5), var(--content)); margin-inline: auto; }
.skip { position: absolute; left: -999px; top: 0; background: var(--color-text); color: var(--color-bg); padding: var(--space-2) var(--space-4); z-index: 100; }
.skip:focus { left: var(--space-4); top: var(--space-4); }

/* Header */
.site-header { position: sticky; top: 0; z-index: 40; background: oklch(0.975 0.004 90 / 0.85); backdrop-filter: blur(12px); border-bottom: 1px solid var(--color-border); }
.site-header .wrap { display: flex; align-items: center; justify-content: space-between; gap: var(--space-4); min-height: 64px; }
.brand { display: inline-flex; align-items: center; gap: var(--space-2); font-weight: 700; text-decoration: none; letter-spacing: -0.01em; font-size: var(--text-base); }
.brand-dot { width: 18px; height: 18px; border-radius: 5px; background: #fff; box-shadow: inset 0 0 0 1.5px var(--color-text); }
.nav { display: flex; gap: var(--space-1); align-items: center; }
.nav a { text-decoration: none; font-size: var(--text-sm); font-weight: 500; color: var(--color-muted); padding: var(--space-2) var(--space-3); border-radius: var(--radius-sm); }
.nav a:hover, .nav a[aria-current='page'] { color: var(--color-text); background: var(--color-surface-2); }
.nav-toggle { display: none; width: 44px; height: 44px; border-radius: var(--radius-sm); align-items: center; justify-content: center; }
.nav-toggle svg { width: 22px; height: 22px; }
@media (max-width: 820px) {
  .nav-toggle { display: inline-flex; }
  .nav { position: absolute; top: 64px; left: 0; right: 0; flex-direction: column; align-items: stretch; background: var(--color-surface); border-bottom: 1px solid var(--color-border); padding: var(--space-3) var(--space-5) var(--space-5); box-shadow: var(--shadow-md); clip-path: inset(0 0 100% 0); opacity: 0; pointer-events: none; transition: clip-path 300ms var(--ease), opacity 200ms var(--ease); }
  .nav.open { clip-path: inset(0 0 0 0); opacity: 1; pointer-events: auto; }
  .nav a { padding: var(--space-3); font-size: var(--text-base); }
}

/* Hero / tool */
.hero { padding-block: var(--space-12) var(--space-16); }
.hero-grid { display: grid; grid-template-columns: 1fr; gap: var(--space-10); align-items: center; }
@media (min-width: 960px) { .hero-grid { grid-template-columns: 0.9fr 1.1fr; gap: var(--space-16); } }
.eyebrow { font-family: var(--font-mono); font-size: var(--text-xs); text-transform: uppercase; letter-spacing: 0.08em; color: var(--color-muted); display: inline-flex; gap: var(--space-2); align-items: center; }
.eyebrow .sw { width: 10px; height: 10px; border-radius: 3px; box-shadow: inset 0 0 0 1px var(--color-border-strong); }
h1 { font-family: var(--font-display); font-size: var(--text-hero); font-weight: 800; letter-spacing: -0.035em; line-height: 0.98; margin-block: var(--space-4) var(--space-5); }
.lead { font-size: var(--text-lg); color: var(--color-muted); line-height: 1.5; max-width: 46ch; }
.actions { display: flex; flex-wrap: wrap; gap: var(--space-3); margin-top: var(--space-8); }
.btn { display: inline-flex; align-items: center; justify-content: center; gap: var(--space-2); min-height: 48px; padding: 0 var(--space-6); border-radius: 999px; font-weight: 600; font-size: var(--text-sm); text-decoration: none; border: 1px solid transparent; }
.btn svg { width: 18px; height: 18px; }
.btn-primary { background: var(--color-text); color: var(--color-bg); }
.btn-primary:hover { background: var(--color-primary); }
.btn-ghost { border-color: var(--color-border-strong); background: var(--color-surface); }
.btn-ghost:hover { border-color: var(--color-text); }
.btn:active { transform: scale(0.98); }
.kbd-hint { margin-top: var(--space-5); font-size: var(--text-xs); color: var(--color-faint); }
kbd { font-family: var(--font-mono); font-size: 0.75rem; padding: 2px 6px; border-radius: 4px; border: 1px solid var(--color-border-strong); background: var(--color-surface); color: var(--color-muted); }

.stage { position: relative; }
.monitor { background: oklch(0.22 0.01 260); border-radius: var(--radius-xl); padding: 14px; box-shadow: var(--shadow-lg); }
.screen { position: relative; aspect-ratio: 16 / 10; border-radius: 12px; overflow: hidden; cursor: zoom-in; display: grid; place-items: center; transition: background 400ms var(--ease); outline-offset: 4px; }
.screen-cta { font-family: var(--font-mono); font-size: var(--text-xs); letter-spacing: 0.06em; text-transform: uppercase; padding: var(--space-2) var(--space-4); border-radius: 999px; background: oklch(0.2 0 0 / 0.08); color: oklch(0.2 0 0 / 0.65); opacity: 0; transition: opacity 250ms var(--ease); }
.screen.dark .screen-cta { background: oklch(1 0 0 / 0.12); color: oklch(1 0 0 / 0.8); }
.screen:hover .screen-cta, .screen:focus-visible .screen-cta { opacity: 1; }
.screen canvas { position: absolute; inset: 0; width: 100%; height: 100%; }
.monitor-foot { width: 22%; height: 18px; margin: 0 auto; background: oklch(0.3 0.01 260); clip-path: polygon(12% 0, 88% 0, 100% 100%, 0 100%); }

/* Swatch picker */
.picker { margin-top: var(--space-6); display: flex; flex-wrap: wrap; gap: var(--space-2); align-items: center; }
.swatch { width: 36px; height: 36px; border-radius: 10px; box-shadow: inset 0 0 0 1px var(--color-border-strong); position: relative; }
.swatch[aria-pressed='true']::after { content: ''; position: absolute; inset: -4px; border-radius: 13px; border: 2px solid var(--color-text); }
.swatch:hover { transform: translateY(-2px); }
.custom-color { display: inline-flex; align-items: center; gap: var(--space-2); margin-left: var(--space-2); font-size: var(--text-sm); color: var(--color-muted); }
.custom-color input[type='color'] { width: 36px; height: 36px; border: 1px solid var(--color-border-strong); border-radius: 10px; padding: 2px; background: var(--color-surface); cursor: pointer; }
.hex { font-family: var(--font-mono); font-size: var(--text-xs); color: var(--color-muted); margin-left: auto; }

/* Sections */
section { padding-block: var(--space-16); }
.section-head { margin-bottom: var(--space-10); max-width: 60ch; }
h2 { font-family: var(--font-display); font-size: var(--text-2xl); font-weight: 700; letter-spacing: -0.025em; }
.section-head p { color: var(--color-muted); margin-top: var(--space-3); }
h3 { font-size: var(--text-lg); font-weight: 700; letter-spacing: -0.01em; }
.band { background: var(--color-surface); border-block: 1px solid var(--color-border); }

.grid-tools { display: grid; grid-template-columns: repeat(auto-fill, minmax(min(100%, 200px), 1fr)); gap: var(--space-4); }
.tool-card { display: flex; flex-direction: column; text-decoration: none; border-radius: var(--radius-lg); background: var(--color-surface); border: 1px solid var(--color-border); overflow: hidden; }
.tool-card:hover { border-color: var(--color-border-strong); box-shadow: var(--shadow-md); }
.tool-card .chip { aspect-ratio: 16 / 9; border-bottom: 1px solid var(--color-border); position: relative; overflow: hidden; }
.tool-card .meta { padding: var(--space-4); display: flex; justify-content: space-between; align-items: baseline; gap: var(--space-2); }
.tool-card .name { font-weight: 600; }
.tool-card .code { font-family: var(--font-mono); font-size: var(--text-xs); color: var(--color-faint); }
.tool-card[aria-current='page'] { border-color: var(--color-text); }

.steps { display: grid; gap: var(--space-4); grid-template-columns: repeat(auto-fit, minmax(min(100%, 240px), 1fr)); counter-reset: s; }
.step { padding: var(--space-6); border-radius: var(--radius-lg); background: var(--color-bg); border: 1px solid var(--color-border); }
.step::before { counter-increment: s; content: '0' counter(s); font-family: var(--font-mono); font-size: var(--text-xs); color: var(--color-faint); display: block; margin-bottom: var(--space-6); }
.step p { color: var(--color-muted); margin-top: var(--space-2); font-size: var(--text-sm); }

.uses { display: grid; gap: 1px; background: var(--color-border); border: 1px solid var(--color-border); border-radius: var(--radius-lg); overflow: hidden; grid-template-columns: repeat(auto-fit, minmax(min(100%, 240px), 1fr)); }
.use { background: var(--color-surface); padding: var(--space-8) var(--space-6); }
.use svg { width: 24px; height: 24px; color: var(--color-primary); margin-bottom: var(--space-5); }
.use p { color: var(--color-muted); margin-top: var(--space-2); font-size: var(--text-sm); }

.prose { max-width: 72ch; }
.prose h2 { margin-bottom: var(--space-5); }
.prose h3 { margin-top: var(--space-8); margin-bottom: var(--space-2); }
.prose p { color: var(--color-muted); margin-bottom: var(--space-4); }
.prose ul { padding-left: var(--space-5); color: var(--color-muted); margin-bottom: var(--space-4); }
.prose li { margin-bottom: var(--space-1); }
.prose strong { color: var(--color-text); }
.two-col { display: grid; gap: var(--space-12); }
@media (min-width: 960px) { .two-col { grid-template-columns: 1.4fr 1fr; } }
.aside-card { position: sticky; top: 96px; align-self: start; padding: var(--space-6); border-radius: var(--radius-lg); background: var(--color-surface); border: 1px solid var(--color-border); }
.aside-card p { color: var(--color-muted); font-size: var(--text-sm); margin-top: var(--space-2); }
.aside-card .btn { margin-top: var(--space-5); width: 100%; }

.faq details { border-bottom: 1px solid var(--color-border); }
.faq summary { list-style: none; cursor: pointer; padding: var(--space-5) 0; font-weight: 600; display: flex; justify-content: space-between; gap: var(--space-4); min-height: 44px; }
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: '+'; font-family: var(--font-mono); color: var(--color-faint); transition: transform 250ms var(--ease); }
.faq details[open] summary::after { transform: rotate(45deg); }
.faq details p { padding-bottom: var(--space-5); color: var(--color-muted); }

/* Download panel */
.dl { display: grid; gap: var(--space-6); padding: var(--space-6); border-radius: var(--radius-xl); background: var(--color-surface); border: 1px solid var(--color-border); box-shadow: var(--shadow-sm); }
@media (min-width: 860px) { .dl { grid-template-columns: 220px 1fr; padding: var(--space-8); } }
.dl-preview { border-radius: var(--radius-md); aspect-ratio: 1; box-shadow: inset 0 0 0 1px var(--color-border-strong); transition: background 300ms var(--ease), aspect-ratio 300ms var(--ease); max-height: 260px; margin-inline: auto; width: 100%; }
.field-label { font-size: var(--text-xs); font-family: var(--font-mono); text-transform: uppercase; letter-spacing: 0.06em; color: var(--color-muted); margin-bottom: var(--space-2); display: block; }
.seg { display: flex; flex-wrap: wrap; gap: var(--space-2); margin-bottom: var(--space-5); }
.seg button { min-height: 40px; padding: 0 var(--space-4); border-radius: 999px; border: 1px solid var(--color-border-strong); font-size: var(--text-sm); font-weight: 500; background: var(--color-surface); }
.seg button small { color: var(--color-faint); font-family: var(--font-mono); font-size: 0.7rem; margin-left: 4px; }
.seg button[aria-pressed='true'] { background: var(--color-text); color: var(--color-bg); border-color: var(--color-text); }
.seg button[aria-pressed='true'] small { color: oklch(1 0 0 / 0.6); }
.dl-status { font-size: var(--text-xs); color: var(--color-muted); margin-top: var(--space-3); min-height: 1.2em; }

/* Zoom light controls */
.controls { display: grid; gap: var(--space-5); margin-top: var(--space-6); }
.range-row label { display: flex; justify-content: space-between; font-size: var(--text-sm); font-weight: 500; margin-bottom: var(--space-2); }
.range-row output { font-family: var(--font-mono); color: var(--color-muted); font-size: var(--text-xs); }
input[type='range'] { width: 100%; accent-color: var(--color-text); height: 28px; }

/* Fullscreen overlay */
.fs { position: fixed; inset: 0; z-index: 1000; display: none; cursor: none; }
.fs.on { display: block; }
.fs.show-ui { cursor: default; }
.fs canvas { position: absolute; inset: 0; width: 100%; height: 100%; }
.fs-bar { position: absolute; left: 50%; bottom: 24px; transform: translate(-50%, 12px); display: flex; gap: var(--space-2); align-items: center; padding: 6px; border-radius: 999px; background: oklch(0.18 0.01 260 / 0.82); backdrop-filter: blur(10px); color: #fff; opacity: 0; pointer-events: none; transition: opacity 250ms var(--ease), transform 250ms var(--ease); max-width: calc(100% - 24px); flex-wrap: wrap; justify-content: center; }
.fs.show-ui .fs-bar { opacity: 1; transform: translate(-50%, 0); pointer-events: auto; }
.fs-bar button { min-height: 40px; min-width: 40px; padding: 0 var(--space-3); border-radius: 999px; color: #fff; font-size: var(--text-sm); display: inline-flex; align-items: center; gap: 6px; }
.fs-bar button:hover { background: oklch(1 0 0 / 0.14); }
.fs-bar svg { width: 18px; height: 18px; }
.fs-bar .dotbtn { width: 22px; height: 22px; min-width: 22px; min-height: 22px; padding: 0; border-radius: 50%; box-shadow: inset 0 0 0 1.5px oklch(1 0 0 / 0.5); margin: 0 3px; }
.fs-bar .sep { width: 1px; height: 22px; background: oklch(1 0 0 / 0.2); margin: 0 4px; }
.fs-toast { position: absolute; top: 20px; left: 50%; transform: translateX(-50%); font-size: var(--text-xs); font-family: var(--font-mono); padding: 6px 12px; border-radius: 999px; background: oklch(0.18 0.01 260 / 0.8); color: #fff; opacity: 0; transition: opacity 300ms var(--ease); pointer-events: none; white-space: nowrap; }
.fs-toast.on { opacity: 1; }

/* Footer */
.site-footer { border-top: 1px solid var(--color-border); padding-block: var(--space-12) var(--space-8); font-size: var(--text-sm); color: var(--color-muted); }
.foot-grid { display: grid; gap: var(--space-8); grid-template-columns: repeat(auto-fit, minmax(min(100%, 170px), 1fr)); }
.foot-grid h4 { font-size: var(--text-xs); text-transform: uppercase; letter-spacing: 0.08em; font-family: var(--font-mono); color: var(--color-text); font-weight: 500; margin-bottom: var(--space-3); }
.foot-grid ul { list-style: none; display: grid; gap: var(--space-2); }
.foot-grid a { text-decoration: none; }
.foot-grid a:hover { color: var(--color-text); }
.foot-bottom { margin-top: var(--space-10); padding-top: var(--space-6); border-top: 1px solid var(--color-border); display: flex; justify-content: space-between; flex-wrap: wrap; gap: var(--space-3); font-size: var(--text-xs); }

.crumbs { font-size: var(--text-xs); color: var(--color-faint); }
.crumbs a { text-decoration: none; }
.crumbs a:hover { color: var(--color-text); }

.reveal { opacity: 0; transition: opacity 700ms var(--ease); }
.reveal.in { opacity: 1; }
@media (prefers-reduced-motion: reduce) { .reveal { opacity: 1; } }

/* Language switcher */
.lang { position: relative; }
.lang summary { list-style: none; cursor: pointer; display: inline-flex; align-items: center; gap: 6px; min-height: 40px; padding: 0 var(--space-3); border-radius: var(--radius-sm); font-size: var(--text-sm); font-weight: 500; color: var(--color-muted); border: 1px solid var(--color-border); }
.lang summary::-webkit-details-marker { display: none; }
.lang summary:hover { color: var(--color-text); border-color: var(--color-border-strong); }
.lang summary svg { width: 16px; height: 16px; }
.lang ul { position: absolute; right: 0; top: calc(100% + 6px); list-style: none; background: var(--color-surface); border: 1px solid var(--color-border); border-radius: var(--radius-md); box-shadow: var(--shadow-md); padding: var(--space-2); min-width: 180px; z-index: 60; display: grid; gap: 2px; }
.lang li a { display: flex; justify-content: space-between; gap: var(--space-3); padding: var(--space-2) var(--space-3); border-radius: var(--radius-sm); text-decoration: none; font-size: var(--text-sm); }
.lang li a:hover { background: var(--color-surface-2); }
.lang li a[aria-current='true'] { font-weight: 700; }
.lang li a span { font-family: var(--font-mono); font-size: var(--text-xs); color: var(--color-faint); text-transform: uppercase; }
.head-right { display: flex; align-items: center; gap: var(--space-2); }
.legal-sec { margin-top: var(--space-8); }
.legal-sec h2 { font-size: var(--text-lg); font-family: var(--font-body); font-weight: 700; letter-spacing: 0; margin-bottom: var(--space-2); }
.legal-sec p { color: var(--color-muted); margin-bottom: var(--space-3); }
.legal-sec a { color: var(--color-primary); }