/* ==========================================================================
   VTM — shared design system for public pages
   ========================================================================== */

:root {
  --page-bg: #f7f5f0;
  --page-bg-alt: #efece4;
  --surface: #ffffff;
  --surface-border: #e4e0d6;
  --ink: #14181f;
  --ink-muted: #5b6270;
  --ink-soft: #7b8291;

  --navy: #0b1220;
  --navy-elevated: #121b2e;
  --navy-card: #17223a;
  --navy-border: #26324a;
  --navy-ink: #eef1f7;
  --navy-ink-muted: #9aa5b8;

  --accent: #0f8fb0;
  --accent-bright: #14b8d6;
  --accent-dim: rgba(20, 184, 214, 0.12);
  --accent-glow: rgba(20, 184, 214, 0.35);
  --accent-ink: #052a33;

  --warning: #b4740e;
  --warning-bg: rgba(180, 116, 14, 0.1);
  --error: #b3261e;
  --error-bg: rgba(179, 38, 30, 0.08);
  --success: #16794f;
  --success-bg: rgba(22, 121, 79, 0.1);

  --font-sans: 'Outfit', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'JetBrains Mono', ui-monospace, 'SFMono-Regular', Menlo, monospace;

  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 18px;
  --shadow-card: 0 1px 2px rgba(20, 24, 31, 0.04), 0 8px 24px -12px rgba(20, 24, 31, 0.12);
}

@media (prefers-color-scheme: dark) {
  :root {
    --page-bg: #0b0e14;
    --page-bg-alt: #10141d;
    --surface: #131826;
    --surface-border: #232b3d;
    --ink: #eef1f7;
    --ink-muted: #9aa5b8;
    --ink-soft: #7b8291;
    --navy: #060a12;
    --navy-elevated: #0d1420;
    --navy-card: #121a2b;
    --navy-border: #232e46;
  }
}

:root[data-theme="dark"] {
  --page-bg: #0b0e14;
  --page-bg-alt: #10141d;
  --surface: #131826;
  --surface-border: #232b3d;
  --ink: #eef1f7;
  --ink-muted: #9aa5b8;
  --ink-soft: #7b8291;
  --navy: #060a12;
  --navy-elevated: #0d1420;
  --navy-card: #121a2b;
  --navy-border: #232e46;
}

:root[data-theme="light"] {
  --page-bg: #f7f5f0;
  --page-bg-alt: #efece4;
  --surface: #ffffff;
  --surface-border: #e4e0d6;
  --ink: #14181f;
  --ink-muted: #5b6270;
  --ink-soft: #7b8291;
  --navy: #0b1220;
  --navy-elevated: #121b2e;
  --navy-card: #17223a;
  --navy-border: #26324a;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { animation-duration: 0.001ms !important; animation-iteration-count: 1 !important; transition-duration: 0.001ms !important; }
}

body {
  font-family: var(--font-sans);
  background: var(--page-bg);
  color: var(--ink);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; text-decoration: none; }

img { max-width: 100%; }

.container {
  max-width: 1120px;
  margin: 0 auto;
  padding: 0 24px;
}

.container-narrow {
  max-width: 760px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ---------- Skip link ---------- */
.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  z-index: 1000;
  background: var(--accent);
  color: #fff;
  padding: 12px 20px;
  border-radius: 0 0 8px 0;
  font-weight: 600;
}

.skip-link:focus {
  left: 0;
}

/* ---------- Focus states ---------- */
a:focus-visible,
button:focus-visible,
input:focus-visible,
textarea:focus-visible,
select:focus-visible,
[tabindex]:focus-visible {
  outline: 2px solid var(--accent-bright);
  outline-offset: 2px;
  border-radius: 4px;
}

/* ---------- Header ---------- */
.site-header-wrap {
  position: sticky;
  top: 0;
  z-index: 200;
  background: color-mix(in srgb, var(--page-bg) 88%, transparent);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--surface-border);
}

.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 16px 0;
  max-width: 1120px;
  margin: 0 auto;
  padding-left: 24px;
  padding-right: 24px;
}

.brand {
  display: flex;
  align-items: baseline;
  gap: 8px;
  font-weight: 700;
  font-size: 18px;
  letter-spacing: -0.01em;
  color: var(--ink);
}

.brand img {
  width: 22px;
  height: 22px;
  vertical-align: middle;
  margin-right: 2px;
}

.brand-sub {
  font-size: 12px;
  font-weight: 500;
  color: var(--ink-soft);
  letter-spacing: 0.01em;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 28px;
}

.site-nav a:not(.nav-cta) {
  font-size: 14px;
  font-weight: 500;
  color: var(--ink-muted);
  transition: color 0.15s;
}

.site-nav a:not(.nav-cta):hover {
  color: var(--ink);
}

.nav-cta {
  padding: 9px 16px;
  background: var(--accent);
  color: #ffffff;
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 13.5px;
  transition: background 0.15s, transform 0.15s;
  white-space: nowrap;
}

.nav-cta:hover {
  background: var(--accent-bright);
}

.nav-toggle {
  display: none;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  background: transparent;
  border: 1px solid var(--surface-border);
  border-radius: var(--radius-sm);
  color: var(--ink);
  cursor: pointer;
}

.nav-toggle svg { width: 20px; height: 20px; }

@media (max-width: 860px) {
  .site-nav {
    position: fixed;
    inset: 0 0 auto auto;
    top: 65px;
    right: 0;
    left: 0;
    background: var(--page-bg);
    border-bottom: 1px solid var(--surface-border);
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 8px 24px 20px;
    transform: translateY(-8px);
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.18s ease, transform 0.18s ease, visibility 0.18s;
  }

  .site-nav.open {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
  }

  .site-nav a:not(.nav-cta) {
    padding: 14px 4px;
    border-bottom: 1px solid var(--surface-border);
    font-size: 15px;
  }

  .site-nav .nav-cta {
    margin-top: 14px;
    text-align: center;
  }

  .nav-toggle { display: inline-flex; }
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 13px 22px;
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 15px;
  cursor: pointer;
  border: 1px solid transparent;
  transition: background 0.15s, border-color 0.15s, transform 0.15s;
  line-height: 1.2;
}

.btn-primary {
  background: var(--accent);
  color: #ffffff;
}

.btn-primary:hover { background: var(--accent-bright); }

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

.btn-secondary:hover { border-color: var(--ink-soft); }

.btn-ghost {
  background: transparent;
  color: var(--navy-ink);
  border-color: var(--navy-border);
}

.btn-ghost:hover { border-color: var(--accent-bright); }

.btn-block { width: 100%; }

/* ---------- Sections ---------- */
main { display: block; }

section { padding: 88px 0; }

.section-tight { padding: 64px 0; }

.eyebrow {
  display: inline-block;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 16px;
}

.section-head {
  max-width: 640px;
  margin: 0 auto 48px;
  text-align: center;
}

.section-head h2 {
  font-size: clamp(28px, 4vw, 38px);
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.2;
  margin-bottom: 16px;
  color: var(--ink);
}

.section-head p {
  font-size: 17px;
  color: var(--ink-muted);
  line-height: 1.6;
}

h1, h2, h3, h4 { color: var(--ink); }

/* ---------- Surfaces / cards ---------- */
.card {
  background: var(--surface);
  border: 1px solid var(--surface-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card);
}

/* ---------- Mono labels ---------- */
.mono {
  font-family: var(--font-mono);
}

.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  padding: 4px 10px;
  border-radius: 999px;
  background: var(--accent-dim);
  color: var(--accent);
  border: 1px solid rgba(20, 184, 214, 0.25);
}

/* ---------- Footer ---------- */
.site-footer {
  border-top: 1px solid var(--surface-border);
  padding: 40px 0;
  background: var(--page-bg-alt);
}

.footer-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 20px;
}

.footer-copy {
  font-size: 13px;
  color: var(--ink-soft);
}

.footer-links {
  display: flex;
  gap: 22px;
  flex-wrap: wrap;
}

.footer-links a {
  font-size: 13px;
  color: var(--ink-muted);
  transition: color 0.15s;
}

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

/* ---------- Utilities ---------- */
.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;
}

.hidden { display: none !important; }

@media (max-width: 640px) {
  section { padding: 56px 0; }
}