/* Nikah GO — лендинг. Токены из brain/DESIGN.md (hex-эквиваленты OKLch). */

:root {
  --bg: #ffffff;
  --surface: #fafafa;
  --surface-alt: #f0f0f2;
  --fg: #1a1a1f;
  --muted: #7a7a82;
  --border: #e8e8ea;
  --border-strong: #d0d0d5;
  --accent: #e63946;
  --accent-hover: #d42836;
  --accent-soft: #fef0f0;

  /* тёмный первый экран */
  --dark-bg: #16161a;
  --dark-fg: #f2f2f4;
  --dark-muted: #a8a8b0;
  --dark-border: #2c2c33;

  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, system-ui, sans-serif;
  --radius-md: 12px;
  --radius-lg: 16px;
  --container: 1040px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--font);
  font-size: 17px;
  line-height: 1.5;
  color: var(--fg);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; }

h1, h2, h3 { margin: 0; letter-spacing: -0.02em; line-height: 1.2; }
h1 { font-size: clamp(32px, 5vw, 48px); font-weight: 700; }
h2 { font-size: clamp(26px, 3.2vw, 34px); font-weight: 700; }
h3 { font-size: 20px; font-weight: 600; line-height: 1.3; }
p { margin: 0; }

.container {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px;
}

.muted { color: var(--muted); }

/* ---------- Кнопки ---------- */

.btn {
  display: inline-block;
  padding: 16px 28px;
  border-radius: var(--radius-lg);
  background: var(--accent);
  color: #fff;
  font-weight: 600;
  font-size: 17px;
  text-decoration: none;
  border: 0;
  transition: background 120ms ease, transform 120ms ease;
}
.btn:hover { background: var(--accent-hover); }
.btn:active { transform: scale(0.98); }
.btn:focus-visible { outline: 3px solid var(--accent-soft); outline-offset: 2px; }

/* ---------- Шапка и первый экран (тёмные) ---------- */

.hero {
  background: var(--dark-bg);
  color: var(--dark-fg);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 20px 0;
  border-bottom: 1px solid var(--dark-border);
}

.logo {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 20px;
  letter-spacing: -0.02em;
  text-decoration: none;
}
.logo svg { width: 28px; height: 28px; flex: none; }

.nav-links {
  display: flex;
  gap: 28px;
  align-items: center;
  font-size: 15px;
}
.nav-links a { color: var(--dark-muted); text-decoration: none; }
.nav-links a:hover { color: var(--dark-fg); }
.nav-links a.nav-cta { color: var(--dark-fg); font-weight: 600; }

.hero-body {
  padding: 88px 0 96px;
  max-width: 720px;
}
.hero-body p.lead {
  margin-top: 20px;
  font-size: clamp(18px, 2vw, 21px);
  color: var(--dark-muted);
  max-width: 600px;
}
.hero-actions {
  margin-top: 36px;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 16px 24px;
}
.hero-actions .note { font-size: 15px; color: var(--dark-muted); }

/* ---------- Секции ---------- */

.section { padding: 80px 0; border-top: 1px solid var(--border); }
.section:first-of-type { border-top: 0; }

.section-head { max-width: 640px; margin-bottom: 40px; }
.section-head .label {
  display: block;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 12px;
}
.section-head p { margin-top: 12px; color: var(--muted); }

.steps {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  counter-reset: step;
}
.step {
  padding: 28px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
}
.step::before {
  counter-increment: step;
  content: counter(step);
  display: block;
  font-size: 32px;
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1;
  margin-bottom: 16px;
}
.step p { margin-top: 8px; color: var(--muted); }

.principles {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
}
.principle {
  padding: 28px;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
}
.principle p { margin-top: 8px; color: var(--muted); }

/* ---------- FAQ на <details> ---------- */

.faq { max-width: 760px; }
.faq details { border-top: 1px solid var(--border); }
.faq details:last-child { border-bottom: 1px solid var(--border); }
.faq summary {
  list-style: none;
  cursor: pointer;
  padding: 22px 44px 22px 0;
  font-size: 19px;
  font-weight: 600;
  position: relative;
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after {
  content: "+";
  position: absolute;
  right: 4px;
  top: 50%;
  transform: translateY(-50%);
  font-size: 26px;
  font-weight: 400;
  color: var(--muted);
  transition: transform 160ms ease;
}
.faq details[open] summary::after { transform: translateY(-50%) rotate(45deg); }
.faq details p { padding: 0 0 22px; color: var(--muted); max-width: 680px; }

/* ---------- Финальный CTA ---------- */

.cta-final {
  text-align: center;
  padding: 88px 0;
  border-top: 1px solid var(--border);
}
.cta-final h2 { margin-bottom: 12px; }
.cta-final p { color: var(--muted); margin-bottom: 32px; }

/* ---------- Подвал ---------- */

.footer {
  background: var(--surface);
  border-top: 1px solid var(--border);
  padding: 32px 0;
  font-size: 14px;
  color: var(--muted);
}
.footer .container {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 12px 24px;
}
.footer nav { display: flex; flex-wrap: wrap; gap: 8px 20px; }
.footer a { color: var(--muted); text-decoration: none; }
.footer a:hover { color: var(--fg); }

/* ---------- Текстовые страницы (политика, условия) ---------- */

.doc-header {
  border-bottom: 1px solid var(--border);
  padding: 20px 0;
}
.doc-header .nav-doc { border-bottom: 0; padding: 0; }
.doc-header .logo { color: var(--fg); }
.doc-header .nav-links a { color: var(--muted); }
.doc-header .nav-links a:hover { color: var(--fg); }

.doc {
  max-width: 760px;
  padding: 56px 24px 96px;
  margin: 0 auto;
}
.doc h1 { font-size: clamp(28px, 4vw, 40px); margin-bottom: 8px; }
.doc .meta { color: var(--muted); margin-bottom: 32px; }
.doc h2 { font-size: 22px; margin: 40px 0 12px; }
.doc p, .doc li { color: var(--fg); margin: 0 0 12px; }
.doc ul { padding-left: 22px; margin: 0 0 12px; }
.doc .draft {
  padding: 16px 20px;
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-md);
  background: var(--surface-alt);
  margin-bottom: 32px;
  font-size: 15px;
}
.doc mark {
  background: var(--accent-soft);
  color: var(--fg);
  padding: 0 4px;
  border-radius: 4px;
}

/* ---------- Адаптив ---------- */

@media (max-width: 860px) {
  .steps { grid-template-columns: 1fr; }
  .principles { grid-template-columns: 1fr; }
  .nav-links a:not(.nav-cta) { display: none; }
  .hero-body { padding: 64px 0 72px; }
  .section { padding: 60px 0; }
  .cta-final { padding: 64px 0; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .btn, .faq summary::after { transition: none; }
}