:root {
  --bg: #0f1116;
  --surface: #1a1d26;
  --surface-2: #232735;
  --border: #2c3140;
  --text: #e7e9ee;
  --text-dim: #9aa0ad;
  --accent: #4e8cff;
  --accent-hover: #6aa0ff;
  --success: #34c97a;
  --danger: #ff6363;
  --radius: 10px;
  --max-width: 1040px;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", system-ui, Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
  font-size: 16px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 20px;
}

a { color: var(--accent); text-decoration: none; }
a:hover { color: var(--accent-hover); text-decoration: underline; }

h1, h2, h3 { line-height: 1.2; margin: 0 0 .6em; }
h1 { font-size: 2.4rem; }
h2 { font-size: 1.7rem; margin-top: 0; }
h3 { font-size: 1.1rem; }
p { margin: 0 0 1em; }

.site-header {
  border-bottom: 1px solid var(--border);
  background: rgba(15, 17, 22, .8);
  backdrop-filter: blur(8px);
  position: sticky; top: 0; z-index: 10;
}
.header-row {
  display: flex; align-items: center; justify-content: space-between;
  padding: 14px 20px;
}
.brand { font-weight: 700; font-size: 1.15rem; letter-spacing: -0.01em; }
.header-link { color: var(--text-dim); }
.header-link:hover { color: var(--text); text-decoration: none; }

.hero { padding: 70px 0 50px; text-align: center; }
.hero .lede {
  font-size: 1.15rem; color: var(--text-dim);
  max-width: 640px; margin: 0 auto 1.8em;
}

.btn {
  display: inline-block;
  padding: 12px 24px;
  border-radius: var(--radius);
  font-weight: 600;
  border: none;
  cursor: pointer;
  font-size: 1rem;
  font-family: inherit;
  transition: background .15s ease;
}
.btn-primary { background: var(--accent); color: #fff; }
.btn-primary:hover:not(:disabled) { background: var(--accent-hover); }
.btn-primary:disabled { background: #3a4356; color: var(--text-dim); cursor: not-allowed; }
.btn-pay { width: 100%; padding: 14px; font-size: 1.05rem; }

.why {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  padding: 40px 20px;
}
.why-item h3 { color: var(--text); }
.why-item p { color: var(--text-dim); margin: 0; }

.catalog { padding: 50px 20px 30px; }
.catalog-hint { color: var(--text-dim); margin-bottom: 24px; }
.catalog-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 14px;
}
.catalog-loading {
  grid-column: 1 / -1;
  text-align: center;
  color: var(--text-dim);
  padding: 40px 0;
}
.tariff-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px;
  cursor: pointer;
  transition: border-color .15s ease, transform .1s ease;
  user-select: none;
}
.tariff-card:hover { border-color: #3d4456; }
.tariff-card.selected {
  border-color: var(--accent);
  background: var(--surface-2);
  box-shadow: 0 0 0 1px var(--accent);
}
.tariff-volume {
  font-size: 1.4rem;
  font-weight: 700;
  margin-bottom: 4px;
}
.tariff-duration {
  color: var(--text-dim);
  font-size: .92rem;
  margin-bottom: 12px;
}
.tariff-price {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--text);
}
.tariff-price .currency { color: var(--text-dim); font-weight: 400; margin-left: 2px; }

.order { padding: 30px 20px 60px; }
.selected-tariff {
  padding: 14px 16px;
  border-radius: var(--radius);
  background: var(--surface);
  border: 1px solid var(--border);
  margin-bottom: 18px;
  font-weight: 500;
}
.selected-tariff-empty { color: var(--text-dim); font-weight: 400; }
.selected-tariff .price-line { color: var(--text-dim); font-size: .92rem; font-weight: 400; margin-top: 2px; }

.field { display: block; margin-bottom: 18px; }
.field-label {
  display: block;
  font-size: .92rem;
  color: var(--text-dim);
  margin-bottom: 6px;
}
.field input {
  width: 100%;
  padding: 12px 14px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text);
  font-size: 1rem;
  font-family: inherit;
}
.field input:focus { outline: none; border-color: var(--accent); }
.field-hint {
  display: block;
  font-size: .85rem;
  color: var(--text-dim);
  margin-top: 6px;
}

.form-status { margin-top: 14px; font-size: .92rem; min-height: 1.4em; }
.form-status.error { color: var(--danger); }
.form-status.success { color: var(--success); }

.faq { padding: 30px 20px 60px; }
.faq details {
  border-bottom: 1px solid var(--border);
  padding: 14px 0;
}
.faq summary {
  cursor: pointer;
  font-weight: 500;
  padding: 4px 0;
}
.faq summary::-webkit-details-marker { color: var(--text-dim); }
.faq details p { color: var(--text-dim); margin: 10px 0 0; }

.site-footer {
  border-top: 1px solid var(--border);
  padding: 30px 0 40px;
  color: var(--text-dim);
  font-size: .9rem;
  text-align: center;
}
.site-footer p { margin: 4px 0; }
.footer-links .dot { margin: 0 8px; color: var(--border); }

@media (max-width: 720px) {
  h1 { font-size: 1.9rem; }
  h2 { font-size: 1.4rem; }
  .hero { padding: 50px 0 36px; }
  .why { grid-template-columns: 1fr; gap: 18px; padding: 30px 20px; }
}

/* thanks page */
.thanks {
  min-height: 70vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 40px 20px;
  text-align: center;
}
.thanks-card {
  max-width: 540px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 36px 28px;
}
.thanks-card h1 { font-size: 1.7rem; }
.thanks-card .order-id {
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  background: var(--surface-2);
  padding: 4px 8px;
  border-radius: 6px;
  font-size: .9rem;
}