:root {
  --bg: #0f172a;
  --bg-soft: #111827;
  --card: rgba(255, 255, 255, 0.08);
  --text: #f8fafc;
  --muted: #cbd5e1;
  --primary: #f59e0b;
  --primary-dark: #d97706;
  --border: rgba(255, 255, 255, 0.14);
  --success: #22c55e;
  --danger: #ef4444;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: Inter, Arial, sans-serif;
  background:
    radial-gradient(circle at top, #1e293b 0%, #0f172a 55%, #020617 100%);
  color: var(--text);
}

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

.container {
  width: min(1120px, calc(100% - 32px));
  margin: 0 auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: rgba(2, 6, 23, 0.75);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
}

.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 0;
}

.brand {
  font-weight: 700;
  letter-spacing: 0.3px;
}

.nav {
  display: flex;
  gap: 18px;
  color: var(--muted);
}

.hero {
  padding: 72px 0 36px;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.3fr 0.9fr;
  gap: 24px;
}

.eyebrow {
  color: var(--primary);
  text-transform: uppercase;
  letter-spacing: 1px;
  font-size: 12px;
  font-weight: 700;
  margin-bottom: 8px;
}

h1, h2, h3, h4 {
  margin-top: 0;
}

h1 {
  font-size: clamp(32px, 5vw, 56px);
  line-height: 1.05;
  margin-bottom: 14px;
}

.lead {
  font-size: 18px;
  color: var(--muted);
  max-width: 650px;
}

.hero-actions,
.form-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 20px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  padding: 0 18px;
  border-radius: 12px;
  font-weight: 600;
  border: 1px solid transparent;
  transition: 0.2s ease;
}

.btn:hover {
  transform: translateY(-1px);
}

.btn-primary {
  background: var(--primary);
  color: #111827;
}

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

.btn-secondary {
  border-color: var(--border);
  background: rgba(255, 255, 255, 0.03);
  color: var(--text);
}

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 18px;
  padding: 22px;
  backdrop-filter: blur(8px);
}

.hero-card {
  align-self: start;
}

.feature-list {
  margin: 0;
  padding-left: 18px;
  color: var(--muted);
  line-height: 1.8;
}

.section {
  padding: 36px 0 72px;
}

.section-head {
  margin-bottom: 18px;
}

.form-grid {
  display: grid;
  grid-template-columns: 1fr 1fr auto;
  gap: 16px;
  align-items: end;
}

label {
  display: block;
  margin-bottom: 8px;
  color: var(--muted);
  font-size: 14px;
}

input {
  width: 100%;
  height: 46px;
  border-radius: 12px;
  border: 1px solid var(--border);
  background: rgba(255, 255, 255, 0.05);
  color: var(--text);
  padding: 0 14px;
  outline: none;
}

input::placeholder {
  color: #94a3b8;
}

.status {
  margin-top: 16px;
  min-height: 24px;
  color: var(--muted);
}

.result {
  margin-top: 24px;
}

.result-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 14px;
}

.result-card {
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 16px;
  background: rgba(255, 255, 255, 0.04);
}

.result-card span {
  display: block;
  color: var(--muted);
  font-size: 13px;
  margin-bottom: 8px;
}

.result-card strong {
  font-size: 28px;
}

.grid-block {
  margin-top: 20px;
}

pre {
  margin: 0;
  padding: 18px;
  border-radius: 16px;
  background: rgba(2, 6, 23, 0.75);
  border: 1px solid var(--border);
  overflow: auto;
  color: #e2e8f0;
  line-height: 1.5;
}

.meta-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin-top: 20px;
}

.cta-box {
  margin-top: 20px;
  padding-top: 16px;
  border-top: 1px solid var(--border);
}

.hidden {
  display: none !important;
}

.tiny-note {
  margin-top: 12px;
  color: #94a3b8;
  font-size: 12px;
}

.mini-app-body {
  min-height: 100vh;
  display: grid;
  place-items: center;
}

.mini-app-shell {
  width: min(720px, calc(100% - 24px));
}

.mini-app-card {
  text-align: center;
}

.ok {
  color: var(--success);
}

.error {
  color: var(--danger);
}

@media (max-width: 900px) {
  .hero-grid,
  .form-grid,
  .result-grid,
  .meta-grid {
    grid-template-columns: 1fr;
  }

  .nav {
    display: none;
  }
}