:root {
  --bg: #fbfaf7;
  --surface: #ffffff;
  --ink: #16191f;
  --muted: #5a6270;
  --line: #e4e1da;
  --accent: #1f5eff;
  --accent-ink: #ffffff;
  --accent-soft: #eaf0ff;
  --danger: #b42318;
  --ok: #067647;
  --radius: 14px;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0d1016;
    --surface: #151a23;
    --ink: #eef1f6;
    --muted: #a2abba;
    --line: #262d3a;
    --accent: #5b8cff;
    --accent-ink: #0b0e14;
    --accent-soft: #18233d;
    --danger: #ff8a80;
    --ok: #6ee7a8;
    color-scheme: dark;
  }
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font: 17px/1.6 -apple-system, BlinkMacSystemFont, "Segoe UI", Inter, Roboto, "Helvetica Neue", Arial, sans-serif;
}
a { color: var(--accent); text-decoration-thickness: 1px; text-underline-offset: 3px; }
h1, h2, .h3 { line-height: 1.15; letter-spacing: -0.02em; margin: 0 0 .5em; }
h1 { font-size: clamp(2.2rem, 5.5vw, 3.6rem); max-width: 16ch; }
h2 { font-size: clamp(1.6rem, 3.5vw, 2.2rem); }
.h3 { font-size: 1.1rem; letter-spacing: -0.01em; }
p { margin: 0 0 1em; }

.wrap { max-width: 1080px; margin: 0 auto; padding: 0 16px; }
@media (min-width: 720px) { .wrap { padding: 0 32px; } }

.eyebrow {
  font-size: .8rem; font-weight: 600; letter-spacing: .08em; text-transform: uppercase;
  color: var(--muted); margin-bottom: .75em;
}

/* Header */
.site-header {
  position: sticky; top: 0; z-index: 10;
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: saturate(1.4) blur(10px);
  border-bottom: 1px solid var(--line);
}
.header-row { display: flex; align-items: center; justify-content: space-between; height: 64px; gap: 16px; }
.brand { display: flex; align-items: center; gap: 10px; color: var(--ink); text-decoration: none; font-weight: 700; letter-spacing: -0.01em; }
.mark { width: 30px; height: 30px; flex: none; }
.mark rect { fill: var(--ink); }
.mark path { fill: none; stroke: var(--bg); stroke-width: 2.6; stroke-linecap: round; stroke-linejoin: round; }
nav { display: flex; align-items: center; gap: 20px; font-size: .95rem; }
nav a { color: var(--muted); text-decoration: none; }
nav a:hover { color: var(--ink); }
nav a.nav-cta { color: var(--ink); font-weight: 600; }
@media (max-width: 520px) { nav a:not(.nav-cta) { display: none; } }

/* Buttons */
.btn {
  display: inline-flex; align-items: center; justify-content: center;
  min-height: 46px; padding: 0 20px; border-radius: 999px;
  font: inherit; font-weight: 600; font-size: .98rem; text-decoration: none; cursor: pointer;
  border: 1px solid transparent; transition: transform .08s ease, background .15s ease;
}
.btn:active { transform: translateY(1px); }
.btn.primary { background: var(--accent); color: var(--accent-ink); }
.btn.primary:hover { background: color-mix(in srgb, var(--accent) 88%, var(--ink)); }
.btn.ghost { border-color: var(--line); color: var(--ink); background: var(--surface); }
.btn[disabled] { opacity: .6; cursor: progress; }

/* Hero */
.hero { padding: clamp(56px, 10vw, 120px) 0 clamp(40px, 7vw, 80px); }
.lede { font-size: clamp(1.05rem, 2vw, 1.25rem); color: var(--muted); max-width: 60ch; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 28px; }

/* Sections */
section { padding: clamp(48px, 8vw, 88px) 0; }
.principles { padding-top: 0; }
.grid-3, .grid-2 { display: grid; gap: 32px; }
@media (min-width: 760px) {
  .grid-3 { grid-template-columns: repeat(3, 1fr); }
  .grid-2 { grid-template-columns: 1fr 1fr; gap: 56px; }
}
.principles .grid-3 > div { border-top: 2px solid var(--ink); padding-top: 18px; }
.principles p { color: var(--muted); margin: 0; }

.apps, .contact { background: var(--surface); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }

.app-card {
  display: grid; gap: 24px; margin-top: 8px;
  border: 1px solid var(--line); border-radius: var(--radius); padding: clamp(20px, 4vw, 36px);
  background: var(--bg);
}
@media (min-width: 760px) { .app-card { grid-template-columns: 88px 1fr; gap: 32px; } }
.app-icon img { width: 80px; height: 80px; display: block; border-radius: 18px; }
.app-tagline { font-size: 1.25rem; font-weight: 600; letter-spacing: -0.01em; }
.features { padding-left: 1.1em; margin: 0 0 1.25em; }
.features li { margin-bottom: .5em; }
.app-meta { color: var(--muted); font-size: .95rem; }
.app-links { display: flex; flex-wrap: wrap; gap: 8px 20px; font-size: .95rem; margin: 0; }

/* Company facts */
.facts { margin: 0; border: 1px solid var(--line); border-radius: var(--radius); background: var(--surface); }
.facts > div { display: grid; grid-template-columns: 120px 1fr; gap: 12px; padding: 14px 20px; border-top: 1px solid var(--line); }
.facts > div:first-child { border-top: 0; }
.facts dt { color: var(--muted); font-size: .9rem; }
.facts dd { margin: 0; font-weight: 500; overflow-wrap: anywhere; }

/* Form */
.form { display: grid; gap: 16px; }
.field { display: grid; gap: 6px; }
label { font-size: .9rem; font-weight: 600; }
input, select, textarea {
  width: 100%; font: inherit; color: var(--ink); background: var(--bg);
  border: 1px solid var(--line); border-radius: 10px; padding: 11px 14px; min-height: 46px;
}
textarea { resize: vertical; min-height: 140px; }
input:focus, select:focus, textarea:focus, .btn:focus-visible, a:focus-visible {
  outline: 2px solid var(--accent); outline-offset: 2px;
}
[aria-invalid="true"] { border-color: var(--danger); }
.err { color: var(--danger); font-size: .85rem; margin: 0; min-height: 0; }
.err:empty { display: none; }
.hp { position: absolute; left: -10000px; width: 1px; height: 1px; overflow: hidden; }
.status { margin: 0; font-size: .95rem; }
.status.ok { color: var(--ok); }
.status.bad { color: var(--danger); }
.fine { color: var(--muted); font-size: .9rem; }
.form .btn { justify-self: start; }

/* Footer */
.site-footer { padding: 28px 0 40px; color: var(--muted); font-size: .9rem; }
.footer-row { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 8px 24px; }
.footer-row p { margin: 0; }

/* Plain pages (privacy, 404) */
.page { padding: clamp(40px, 7vw, 80px) 0; }
.page .wrap { max-width: 760px; }
.page h2 { font-size: 1.25rem; margin-top: 1.8em; }