/* Clarus landing page — hand-authored, zero-build.
   Tokens copied verbatim from DESIGN.md "Implementation Tokens". */

:root {
  color-scheme: dark;

  /* Color */
  --bg-base: #081014;
  --bg-deep: #02080b;
  --text-primary: #e7eef2;
  --text-secondary: #8ea0a8;
  --text-tertiary: #7f929a;
  --accent: #2ee8d6;
  --accent-text: #aefbf3;
  --ink-on-accent: #061012;
  --danger: #ffb4a8;
  --warning: #f5c451;
  --info: #8ebbff;
  --border: rgba(231, 238, 242, 0.11);
  --border-strong: rgba(231, 238, 242, 0.14);
  --surface: rgba(231, 238, 242, 0.055);
  --surface-strong: rgba(231, 238, 242, 0.07);
  --accent-soft: rgba(46, 232, 214, 0.09);

  /* Radius */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-pill: 999px;

  /* Spacing (base unit 4px) */
  --space-2xs: 2px;
  --space-xs: 4px;
  --space-sm: 8px;
  --space-md: 12px;
  --space-lg: 16px;
  --space-xl: 24px;
  --space-2xl: 30px;
  --space-3xl: 38px;

  /* Motion */
  --ease-standard: cubic-bezier(0.2, 0, 0, 1);
  --duration-hover: 80ms;
  --duration-entrance: 240ms;

  /* Typography */
  --font-display:
    "Satoshi", "General Sans", ui-sans-serif, system-ui, -apple-system,
    BlinkMacSystemFont, "Segoe UI", sans-serif;
  --font-body:
    "Geist", "Source Sans 3", ui-sans-serif, system-ui, -apple-system,
    BlinkMacSystemFont, "Segoe UI", sans-serif;
  --font-mono:
    "JetBrains Mono", ui-monospace, "SF Mono", Menlo, Consolas, monospace;
}

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

html {
  height: 100%;
}

body {
  margin: 0;
  min-height: 100dvh;
  background: var(--bg-base);
  color: var(--text-primary);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

img,
svg {
  display: block;
  max-width: 100%;
}

a {
  color: inherit;
}

ul,
ol {
  margin: 0;
  padding: 0;
  list-style: none;
}

h1,
h2,
h3,
p {
  margin: 0;
}

/* Focus visibility — every interactive element */
a:focus-visible,
button:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: var(--radius-sm);
}

.skip-link {
  position: absolute;
  top: -48px;
  left: var(--space-lg);
  z-index: 100;
  background: var(--accent);
  color: var(--ink-on-accent);
  padding: var(--space-sm) var(--space-lg);
  border-radius: var(--radius-md);
  font-weight: 650;
  text-decoration: none;
  transition: top var(--duration-hover) var(--ease-standard);
}

.skip-link:focus {
  top: var(--space-lg);
}

.wrap {
  width: min(1040px, calc(100% - 48px));
  margin-inline: auto;
}

@media (max-width: 480px) {
  .wrap {
    width: calc(100% - 32px);
  }
}

/* ---------- Header ---------- */

.site-header {
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 10;
  background: rgba(8, 16, 20, 0.86);
  backdrop-filter: saturate(140%) blur(10px);
}

.site-header .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-block: var(--space-md);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  text-decoration: none;
  font-family: var(--font-display);
  font-weight: 650;
  font-size: 18px;
  letter-spacing: -0.01em;
  color: var(--text-primary);
  border-radius: var(--radius-sm);
}

.brand svg {
  width: 28px;
  height: 28px;
}

.header-cta {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-md);
  padding: var(--space-sm) var(--space-md);
  font-size: 13px;
  font-weight: 600;
  text-decoration: none;
  color: var(--text-primary);
  transition:
    border-color var(--duration-hover) var(--ease-standard),
    background-color var(--duration-hover) var(--ease-standard);
}

.header-cta:hover {
  border-color: var(--accent);
  background: var(--accent-soft);
}

/* ---------- Hero ---------- */

.hero {
  padding-block: clamp(56px, 10vw, 108px) var(--space-3xl);
  border-bottom: 1px solid var(--border);
  position: relative;
  overflow: clip;
}

.hero::before {
  content: "";
  position: absolute;
  inset: -20% -10% auto -10%;
  height: 480px;
  background: radial-gradient(
    ellipse at top,
    var(--accent-soft),
    transparent 60%
  );
  pointer-events: none;
  z-index: 0;
}

@media (prefers-reduced-motion: reduce) {
  .hero::before {
    display: none;
  }
}

.hero .wrap {
  position: relative;
  z-index: 1;
}

.hero-mark {
  width: 64px;
  height: 64px;
  margin-bottom: var(--space-xl);
}

.eyebrow {
  display: block;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.09em;
  text-transform: uppercase;
  color: var(--text-tertiary);
  margin-bottom: var(--space-md);
}

.hero h1 {
  font-family: var(--font-display);
  font-weight: 650;
  font-size: clamp(40px, 7vw, 56px);
  line-height: 1.02;
  letter-spacing: -0.02em;
  color: var(--text-primary);
}

.hero-lede {
  margin-top: var(--space-lg);
  max-width: 620px;
  font-size: clamp(17px, 2.2vw, 20px);
  line-height: 1.55;
  color: var(--text-secondary);
}

.hero-actions {
  margin-top: var(--space-xl);
}

/* ---------- Download region (shared: hero + final block) ---------- */

.download-region {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-start;
  gap: var(--space-lg);
}

.download-primary {
  display: inline-flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 2px;
  min-height: 52px;
  justify-content: center;
  border: 1px solid var(--accent);
  border-radius: var(--radius-md);
  padding: var(--space-md) var(--space-xl);
  background: var(--accent);
  color: var(--ink-on-accent);
  text-decoration: none;
  transition:
    transform var(--duration-hover) var(--ease-standard),
    box-shadow var(--duration-hover) var(--ease-standard);
}

.download-primary:hover {
  box-shadow: 0 0 0 4px var(--accent-soft);
}

.download-primary:active {
  transform: translateY(1px);
}

@media (prefers-reduced-motion: reduce) {
  .download-primary {
    transition: none;
  }
}

.download-primary-label {
  font-weight: 750;
  font-size: 15px;
  letter-spacing: -0.01em;
}

.download-primary-meta {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 12.5px;
  color: var(--ink-on-accent);
  opacity: 0.78;
}

.download-note {
  align-self: center;
  font-size: 13px;
  color: var(--text-tertiary);
  max-width: 320px;
}

.download-note code {
  font-family: var(--font-mono);
  color: var(--text-secondary);
}

/* Secondary "all platforms" link toggler under hero */
.download-secondary-link {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-md);
  padding: 0 var(--space-lg);
  color: var(--text-primary);
  text-decoration: none;
  font-size: 14px;
  font-weight: 600;
  transition: border-color var(--duration-hover) var(--ease-standard);
}

.download-secondary-link:hover {
  border-color: var(--accent);
}

/* ---------- Sections ---------- */

section {
  padding-block: var(--space-3xl);
  border-bottom: 1px solid var(--border);
}

.section-head {
  max-width: 640px;
  margin-bottom: var(--space-xl);
}

.section-head .eyebrow {
  margin-bottom: var(--space-sm);
}

.section-head h2 {
  font-family: var(--font-display);
  font-weight: 650;
  font-size: clamp(24px, 3.4vw, 30px);
  letter-spacing: -0.01em;
  margin-bottom: var(--space-md);
}

.section-head p {
  color: var(--text-secondary);
  font-size: 16px;
  line-height: 1.6;
}

/* Safety ladder */

.ladder {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-lg);
  counter-reset: step;
}

@media (max-width: 900px) {
  .ladder {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 560px) {
  .ladder {
    grid-template-columns: 1fr;
  }
}

.ladder-step {
  counter-increment: step;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  background: var(--surface);
  padding: var(--space-lg);
  position: relative;
}

.ladder-step::before {
  content: counter(step, decimal-leading-zero);
  display: block;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 12px;
  font-weight: 700;
  color: var(--accent-text);
  margin-bottom: var(--space-sm);
}

.ladder-step h3 {
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 650;
  margin-bottom: var(--space-xs);
  letter-spacing: -0.005em;
}

.ladder-step p {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.55;
}

.ladder-arrow {
  display: none;
}

/* Trust / evidence note */

.trust-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-lg);
}

@media (max-width: 700px) {
  .trust-grid {
    grid-template-columns: 1fr;
  }
}

.trust-item {
  display: flex;
  gap: var(--space-md);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  background: var(--surface);
  padding: var(--space-lg);
}

.trust-item svg {
  flex: none;
  width: 20px;
  height: 20px;
  color: var(--accent);
  margin-top: 2px;
}

.trust-item h3 {
  font-size: 15px;
  font-weight: 650;
  margin-bottom: var(--space-xs);
  color: var(--text-primary);
}

.trust-item p {
  font-size: 13.5px;
  color: var(--text-secondary);
  line-height: 1.55;
}

/* Final download block */

.download-block {
  text-align: left;
}

.download-block .section-head {
  max-width: 640px;
}

.all-platforms {
  margin-top: var(--space-xl);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  background: var(--bg-deep);
  overflow: clip;
}

.platform-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-md);
  padding: var(--space-md) var(--space-lg);
  border-bottom: 1px solid var(--border);
  text-decoration: none;
  color: var(--text-primary);
  transition: background-color var(--duration-hover) var(--ease-standard);
}

.platform-row:last-child {
  border-bottom: none;
}

.platform-row:hover {
  background: var(--accent-soft);
}

.platform-row-label {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.platform-row-name {
  font-size: 14.5px;
  font-weight: 600;
}

.platform-row-filename {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--text-tertiary);
  word-break: break-all;
}

.platform-row-size {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 13px;
  color: var(--text-secondary);
  white-space: nowrap;
}

.all-platforms-empty {
  padding: var(--space-lg);
  color: var(--text-secondary);
  font-size: 14px;
}

.mac-arch-note {
  margin-top: var(--space-md);
  font-size: 13px;
  color: var(--text-tertiary);
}

.status-line {
  margin-top: var(--space-md);
  font-family: var(--font-mono);
  font-size: 12.5px;
  color: var(--text-tertiary);
}

/* ---------- Footer ---------- */

.site-footer {
  padding-block: var(--space-xl);
}

.site-footer .wrap {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-md);
}

.footer-links {
  display: flex;
  gap: var(--space-lg);
  flex-wrap: wrap;
}

.footer-links a {
  font-size: 13px;
  color: var(--text-secondary);
  text-decoration: none;
  border-radius: var(--radius-sm);
}

.footer-links a:hover {
  color: var(--text-primary);
}

.footer-meta {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 12px;
  color: var(--text-tertiary);
}

/* ---------- Entrance motion (gated) ---------- */

@media (prefers-reduced-motion: no-preference) {
  .hero,
  section {
    animation: fade-in var(--duration-entrance) var(--ease-standard) both;
  }
}

@keyframes fade-in {
  from {
    opacity: 0;
    transform: translateY(6px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

/* Visually-hidden helper for a11y-only text */
.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}