/* Design tokens. Every color, size and space below references one of these. */
:root {
  /* Brand: ink, blue, and green reserved for COMMITTED */
  --color-primary: #2563eb;
  --color-primary-hover: #1d4ed8;
  --color-secondary: #111827;
  --color-secondary-hover: #030712;
  --color-on-primary: #ffffff;
  --color-on-secondary: #ffffff;

  /* Neutral scale */
  --color-neutral-0: #ffffff;
  --color-neutral-50: #f8f9fa;
  --color-neutral-100: #f3f4f6;
  --color-neutral-200: #e5e7eb;
  --color-neutral-300: #d1d5db;
  --color-neutral-400: #9ca3af;
  --color-neutral-500: #6b7280;
  --color-neutral-900: #111827;

  /* Status */
  --color-success: #15803d;
  --color-warning: #b45309;
  --color-error: #b91c1c;

  /* Semantic */
  --color-bg: var(--color-neutral-0);
  --color-bg-alt: var(--color-neutral-50);
  --color-bg-hover: var(--color-neutral-100);
  --color-surface: var(--color-neutral-0);
  --color-border: var(--color-neutral-200);
  --color-border-strong: var(--color-neutral-300);
  --color-rule: var(--color-neutral-900);
  --color-text: #111827;
  --color-text-secondary: #6b7280;
  --color-text-tertiary: #9ca3af;

  /* Demo illustration */
  --color-device: #1f2937;
  --color-screen: var(--color-neutral-100);
  --color-menubar: rgba(255, 255, 255, 0.7);
  --color-toast: #111827;
  --color-on-toast: #ffffff;
  --color-on-toast-muted: #9ca3af;
  --color-toast-success: #15803d;
  --color-art-sky: #f2a65a;
  --color-art-sun: #fde68a;
  --color-art-hill: #3f7d63;
  --color-art-hill-dark: #2a5d4f;

  /* Typography */
  --font: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono: ui-monospace, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;
  --text-xs: 12px;
  --text-sm: 14px;
  --text-base: 16px;
  --text-lg: 20px;
  --text-xl: 24px;
  --text-2xl: 32px;
  --weight-regular: 400;
  --weight-semibold: 600;
  --leading-body: 1.5;
  --leading-heading: 1.25;

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

  /* Shape */
  --radius-sm: 6px;
  --radius-md: 8px;
  --radius-phone: 24px;
  --border: 1px;
  --border-thick: 2px;
  --shadow-1: 0 1px 3px rgba(0, 0, 0, 0.08);
  --shadow-2: 0 4px 12px rgba(0, 0, 0, 0.1);

  /* Sizing */
  --icon-inline: 16px;
  --icon-standalone: 20px;
  --control-sm: 32px;
  --control: 48px;
  --control-lg: 64px;
  --container: 1120px;
  --label-col: 320px;
  --measure: 640px;
  --scene-max: 560px;
  --store-min: 192px;
  --duration: 0.2s;

  color-scheme: light;
}

/* Lucide icon, drawn with currentColor through a mask. */
:root {
  --icon-arrow-up: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='black' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='m5 12 7-7 7 7'/%3E%3Cpath d='M12 19V5'/%3E%3C/svg%3E");
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font);
  font-size: var(--text-base);
  font-weight: var(--weight-regular);
  line-height: var(--leading-body);
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
img, svg { display: block; max-width: 100%; }
a { color: inherit; }
h1, h2, h3 { font-weight: var(--weight-semibold); line-height: var(--leading-heading); margin: 0; text-wrap: balance; }
h1 { font-size: var(--text-2xl); margin-bottom: var(--space-4); }
h2 { font-size: var(--text-xl); }
h3 { font-size: var(--text-base); margin-bottom: var(--space-1); }
p, dl, dd { margin: 0; }
.mono { font-family: var(--font-mono); }

.icon { flex: none; width: var(--icon-standalone); height: var(--icon-standalone); }
.icon-inline { width: var(--icon-inline); height: var(--icon-inline); }

.wrap { width: min(var(--container), 100% - var(--space-8)); margin-inline: auto; }

.skip {
  position: absolute; left: var(--space-2); top: var(--space-2); z-index: 100; transform: translateY(-200%);
  background: var(--color-surface); padding: var(--space-2) var(--space-3); border: var(--border) solid var(--color-border); border-radius: var(--radius-sm);
}
.skip:focus { transform: none; }
:focus-visible { outline: var(--border-thick) solid var(--color-primary); outline-offset: var(--border-thick); border-radius: var(--radius-sm); }

/* Nav */
.nav { position: sticky; top: 0; z-index: 50; background: var(--color-bg); border-bottom: var(--border) solid var(--color-border); }
.nav-inner { display: flex; align-items: center; justify-content: space-between; height: var(--control-lg); }
.brand { display: inline-flex; align-items: center; gap: var(--space-2); font-weight: var(--weight-semibold); text-decoration: none; }
.brand img { border-radius: var(--radius-sm); }
.nav nav { display: flex; align-items: center; gap: var(--space-6); font-size: var(--text-sm); }
.nav nav a:not(.btn) { text-decoration: none; color: var(--color-text-secondary); }
.nav nav a:not(.btn):hover { color: var(--color-text); }

/* Buttons */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: var(--space-2);
  min-height: var(--control); padding: 0 var(--space-6);
  border: var(--border) solid transparent; border-radius: var(--radius-sm);
  background: var(--color-primary); color: var(--color-on-primary);
  font-size: var(--text-base); font-weight: var(--weight-semibold); text-decoration: none;
  transition: background-color var(--duration) ease;
}
.btn:hover { background: var(--color-primary-hover); }
.btn-small { min-height: var(--control-sm); padding: 0 var(--space-4); font-size: var(--text-sm); }
.btn-ghost { background: transparent; color: var(--color-text); border-color: var(--color-border-strong); }
.btn-ghost:hover { background: var(--color-bg-hover); }
.btn-store {
  min-height: var(--control-lg); padding: 0 var(--space-6); gap: var(--space-3);
  background: var(--color-secondary); color: var(--color-on-secondary); text-align: left;
}
.btn-store:hover { background: var(--color-secondary-hover); }
.btn-store span { display: flex; flex-direction: column; font-size: var(--text-lg); line-height: var(--leading-heading); }
.btn-store small { font-size: var(--text-xs); font-weight: var(--weight-regular); }
.btn-store[aria-disabled="true"] { opacity: 0.5; cursor: not-allowed; }
.btn-store[aria-disabled="true"]:hover { background: var(--color-secondary); }

/* Hero */
.hero { padding: var(--space-16) 0; border-bottom: var(--border) solid var(--color-border); }
.hero-grid { display: grid; grid-template-columns: 1fr 1.1fr; gap: var(--space-16); align-items: start; }
.hero-copy { padding-top: var(--space-12); }
.status { display: flex; align-items: center; gap: var(--space-2); margin-bottom: var(--space-6); font-size: var(--text-xs); color: var(--color-text-secondary); }
.status-dot { width: var(--space-2); height: var(--space-2); background: var(--color-primary); }
.accent { color: var(--color-primary); }
.lede { font-size: var(--text-lg); color: var(--color-text-secondary); max-width: var(--measure); }
.cta-row { display: flex; flex-wrap: wrap; gap: var(--space-3); margin-top: var(--space-8); }
.hero-foot { margin-top: var(--space-6); font-size: var(--text-sm); color: var(--color-text-secondary); }

/* Message log under the demo. It shows success only after COMMITTED, as the app does. */
.wire { margin-top: var(--space-6); border-top: var(--border-thick) solid var(--color-rule); }
.wire-head { display: flex; justify-content: space-between; padding: var(--space-2) 0; font-size: var(--text-xs); color: var(--color-text-secondary); border-bottom: var(--border) solid var(--color-border); }
#wireState.busy { color: var(--color-primary); }
#wireState.done { color: var(--color-success); }
.wire-log { list-style: none; padding: 0; margin: 0; min-height: calc(var(--space-6) * 5); font-size: var(--text-xs); }
.wire-log li { display: grid; grid-template-columns: var(--space-12) calc(var(--space-16) * 2) 1fr; gap: var(--space-3); padding: var(--space-1) 0; border-bottom: var(--border) solid var(--color-border); }
.wire-log .from { color: var(--color-text-tertiary); }
.wire-log .msg { font-weight: var(--weight-semibold); }
.wire-log .detail { color: var(--color-text-secondary); overflow-wrap: anywhere; }
.wire-log .ok .msg, .wire-log .ok .detail { color: var(--color-success); }
.wire-log .wire-idle { display: block; color: var(--color-text-tertiary); border-bottom: 0; }

/* Scene */
.scene { position: relative; margin: 0; aspect-ratio: 1 / 0.78; user-select: none; -webkit-user-select: none; }
.mac { position: absolute; top: 0; right: 0; width: 86%; }
.mac-screen {
  position: relative; aspect-ratio: 16 / 10; border-radius: var(--radius-md); overflow: hidden;
  background: var(--color-screen); border: var(--space-2) solid var(--color-device); box-shadow: var(--shadow-1);
}
.menubar { display: flex; align-items: center; gap: var(--space-2); height: var(--space-4); padding: 0 var(--space-3); background: var(--color-menubar); }
.mb-apple { width: var(--space-2); height: var(--space-2); border-radius: var(--border-thick); background: var(--color-text-tertiary); }
.mb-item { width: var(--space-8); height: var(--space-1); border-radius: var(--border-thick); background: var(--color-border-strong); }
.mb-item.short { width: var(--space-6); }
.mb-spacer { flex: 1; }
.mb-icon { width: var(--space-3); height: var(--space-3); border-radius: var(--border-thick); }
.desktop { position: absolute; inset: var(--space-4) 0 0; }
.landing-slot {
  position: absolute; left: 38%; bottom: 14%; width: 24%; aspect-ratio: 4 / 3; border-radius: var(--radius-md);
  outline: var(--border-thick) dashed var(--color-primary); outline-offset: var(--space-1); opacity: 0;
  transition: opacity var(--duration) ease;
}
.scene.armed .landing-slot { opacity: 0.6; }
.landed { position: absolute; border-radius: var(--radius-md); box-shadow: var(--shadow-2); pointer-events: none; }
.toast {
  position: absolute; top: var(--space-6); right: var(--space-3); display: flex; gap: var(--space-2); align-items: center;
  padding: var(--space-2) var(--space-3) var(--space-2) var(--space-2); border-radius: var(--radius-md);
  font-size: var(--text-xs); line-height: var(--leading-heading);
  background: var(--color-toast); color: var(--color-on-toast); box-shadow: var(--shadow-2);
  opacity: 0; transform: translateY(calc(-1 * var(--space-2))); transition: opacity var(--duration) ease, transform var(--duration) ease;
}
.toast small { font-size: var(--text-xs); color: var(--color-on-toast-muted); }
.toast.show { opacity: 1; transform: none; }
.toast-check { flex: none; display: grid; place-items: center; width: var(--space-6); height: var(--space-6); border-radius: 50%; color: var(--color-on-toast); background: var(--color-toast-success); }
.mac-stand { width: 16%; height: var(--space-8); margin: 0 auto; background: var(--color-device); clip-path: polygon(12% 0, 88% 0, 100% 100%, 0 100%); }
.mac-foot { width: 32%; height: var(--space-1); margin: 0 auto; border-radius: 0 0 var(--radius-sm) var(--radius-sm); background: var(--color-device); }

.phone { position: absolute; left: 0; bottom: 0; width: 31%; z-index: 2; }
.phone-screen {
  position: relative; aspect-ratio: 9 / 19.5; border-radius: var(--radius-phone); overflow: hidden;
  background: var(--color-surface); border: var(--space-2) solid var(--color-device); box-shadow: var(--shadow-2);
}
.phone-island { position: absolute; top: var(--space-2); left: 50%; width: 34%; height: var(--space-4); border-radius: var(--space-2); background: var(--color-device); transform: translateX(-50%); }
.edge-zone {
  position: absolute; inset: 0 0 auto; height: 22%; display: flex; align-items: flex-end; justify-content: center; padding: 0 var(--space-1) var(--space-2);
  font-size: var(--text-xs); font-weight: var(--weight-semibold); line-height: var(--leading-heading); text-align: center; color: var(--color-primary);
  background: color-mix(in srgb, var(--color-primary) 12%, transparent);
  opacity: 0.5; transition: opacity var(--duration) ease;
}
.edge-zone span::before {
  content: ""; display: inline-block; vertical-align: text-bottom; width: var(--icon-inline); height: var(--icon-inline);
  background: currentColor; -webkit-mask: var(--icon-arrow-up) center / contain no-repeat; mask: var(--icon-arrow-up) center / contain no-repeat;
}
.scene.armed .edge-zone { opacity: 1; }
.photo {
  position: absolute; left: 12%; right: 12%; top: 34%; aspect-ratio: 4 / 3; padding: 0; border: 0; border-radius: var(--radius-md);
  background: none; cursor: grab; touch-action: none; z-index: 3; box-shadow: var(--shadow-2);
}
.photo:active { cursor: grabbing; }
/* Flat illustration of a photo: hard color stops only, no blends. */
.photo-art, .landed {
  background-color: var(--color-art-sky);
  background-image:
    radial-gradient(circle at 74% 28%, var(--color-art-sun) 0 9%, transparent 9%),
    linear-gradient(170deg, transparent 53%, var(--color-art-hill-dark) 53%),
    linear-gradient(160deg, transparent 61%, var(--color-art-hill) 61%);
}
.photo-art { display: block; width: 100%; height: 100%; border-radius: inherit; }
.phone-hint { position: absolute; left: 0; right: 0; top: 72%; text-align: center; font-size: var(--text-xs); color: var(--color-text-secondary); }
.progress { position: absolute; left: 14%; right: 14%; bottom: 9%; height: var(--space-1); border-radius: var(--space-1); background: var(--color-border); opacity: 0; transition: opacity var(--duration) ease; }
.progress span { display: block; height: 100%; width: 0; border-radius: inherit; background: var(--color-primary); }
.scene.sending .progress { opacity: 1; }

/* Sections: a numbered label column beside the content, separated by heavy rules. */
.section { padding: var(--space-16) 0; }
.section-alt { background: var(--color-bg-alt); }
.row { display: grid; grid-template-columns: var(--label-col) 1fr; gap: var(--space-12); padding-top: var(--space-6); border-top: var(--border-thick) solid var(--color-rule); }
.num { font-size: var(--text-sm); color: var(--color-primary); margin-bottom: var(--space-2); }
.row-lede { margin-top: var(--space-4); color: var(--color-text-secondary); }

.steps { list-style: none; padding: 0; margin: 0; }
.step { display: grid; grid-template-columns: 1fr auto; gap: var(--space-8); align-items: center; padding: var(--space-6) 0; border-bottom: var(--border) solid var(--color-border); }
.step:first-child { padding-top: 0; }
.step:last-child { border-bottom: 0; padding-bottom: 0; }
.step p { color: var(--color-text-secondary); max-width: var(--measure); }
.fig { display: grid; justify-items: center; gap: var(--space-2); }
.fig-label { font-size: var(--text-xs); color: var(--color-text-secondary); }
.code-fig { grid-auto-flow: column; align-items: end; gap: var(--space-3); }
.code-side { display: grid; gap: var(--space-1); justify-items: center; }
.code { padding: var(--space-2) var(--space-3); border: var(--border) solid var(--color-border-strong); border-radius: var(--radius-sm); font-size: var(--text-lg); background: var(--color-surface); }
.code-eq { padding-bottom: var(--space-2); color: var(--color-text-tertiary); }
.dir-fig { width: calc(var(--space-16) * 2.5); }
.dir-mac { fill: var(--color-surface); stroke: var(--color-text); stroke-width: 2; }
.dir-slot { fill: none; stroke: var(--color-border-strong); stroke-width: 1.5; stroke-dasharray: 3 3; }
.dir-pick { fill: var(--color-primary); }
.dir-arrow { stroke: var(--color-primary); stroke-width: 2; stroke-linecap: round; }

.spec > div { display: grid; grid-template-columns: calc(var(--space-16) * 2) 1fr; gap: var(--space-6); padding: var(--space-4) 0; border-bottom: var(--border) solid var(--color-border); }
.spec > div:first-child { padding-top: 0; }
.spec dt { font-size: var(--text-sm); color: var(--color-text); }
.spec dd { color: var(--color-text-secondary); }

.apps { display: grid; grid-template-columns: 1fr 1fr; gap: var(--space-8) var(--space-12); }
.plain { list-style: none; padding: 0; margin: var(--space-2) 0 0; color: var(--color-text-secondary); }
.plain li { padding: var(--space-2) 0; border-top: var(--border) solid var(--color-border); }
.note { grid-column: 1 / -1; font-size: var(--text-sm); color: var(--color-text-secondary); }

/* Long-form text (privacy.html) */
.prose { max-width: var(--measure); color: var(--color-text-secondary); }
.prose h3 { color: var(--color-text); margin-top: var(--space-8); }
.prose h3:first-child { margin-top: 0; }
.prose p + p { margin-top: var(--space-4); }
.prose a { color: var(--color-primary); }

.faq > div { padding: var(--space-4) 0; border-bottom: var(--border) solid var(--color-border); }
.faq > div:first-child { padding-top: 0; }
.faq dt { font-weight: var(--weight-semibold); margin-bottom: var(--space-1); }
.faq dd { color: var(--color-text-secondary); max-width: var(--measure); }

.stores { margin-top: 0; }
.stores + .note { margin-top: var(--space-4); }

.footer { padding: var(--space-6) 0 var(--space-8); font-size: var(--text-xs); color: var(--color-text-secondary); border-top: var(--border) solid var(--color-border); }
.footer-inner { display: flex; flex-wrap: wrap; gap: var(--space-2) var(--space-6); justify-content: space-between; }
.footer a { color: inherit; }
.footer a:hover { color: var(--color-text); }

/* Responsive */
@media (max-width: 920px) {
  .hero { padding-top: var(--space-8); }
  .hero-copy { padding-top: 0; }
  .hero-grid, .row { grid-template-columns: 1fr; gap: var(--space-8); }
  .demo { max-width: var(--scene-max); width: 100%; margin-inline: auto; }
}
@media (max-width: 640px) {
  .nav nav a:not(.btn) { display: none; }
  .section { padding: var(--space-12) 0; }
  .apps { grid-template-columns: 1fr; }
  .step { grid-template-columns: 1fr; justify-items: start; }
  .spec > div { grid-template-columns: 1fr; gap: var(--space-1); }
  .wire-log li { grid-template-columns: var(--space-12) 1fr; }
  .wire-log .detail { grid-column: 2; }
  .mac-screen { border-width: var(--space-1); }
  .phone-screen { border-width: var(--space-1); border-radius: var(--space-4); }
  .phone-island { height: var(--space-2); top: var(--space-1); }
  .btn-store { flex: 1 1 var(--store-min); }
  .toast br, .toast small { display: none; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition-duration: 0.01ms !important; animation-duration: 0.01ms !important; }
}