:root {
  color-scheme: dark;
  --bg: #020617;
  --surface: rgba(15, 23, 42, 0.88);
  --border: rgba(148, 163, 184, 0.18);
  --text: #e2e8f0;
  --muted: #94a3b8;
  --accent: #38bdf8;
  --accent-2: #a78bfa;
  --accent-3: #22c55e;
  --danger: #f87171;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  min-height: 100vh;
  font-family: Inter, "Segoe UI", system-ui, sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at top left, rgba(56, 189, 248, 0.16), transparent 26%),
    radial-gradient(circle at top right, rgba(167, 139, 250, 0.16), transparent 24%),
    linear-gradient(180deg, #020617 0%, #0b1220 50%, #020617 100%);
}

a { color: var(--accent); }

.auth-shell {
  min-height: 100vh;
  display: grid;
  grid-template-columns: minmax(320px, 1.05fr) minmax(360px, 0.95fr);
  gap: 18px;
  padding: 24px;
}

.panel {
  border: 1px solid var(--border);
  border-radius: 28px;
  background: var(--surface);
  backdrop-filter: blur(18px);
  box-shadow: 0 26px 80px rgba(0, 0, 0, 0.28);
}

.auth-copy,
.auth-card {
  padding: 28px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 28px;
}

.brand-mark {
  width: 46px;
  height: 46px;
  border-radius: 16px;
  display: grid;
  place-items: center;
  font-weight: 800;
  color: #00111f;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
}

.brand-title {
  font-size: 18px;
  font-weight: 800;
}

.brand-subtitle {
  color: var(--muted);
  font-size: 13px;
}

.eyebrow {
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.16em;
  font-size: 12px;
  font-weight: 800;
}

h1 {
  font-size: clamp(36px, 4.6vw, 64px);
  line-height: 0.96;
  letter-spacing: -0.05em;
  max-width: 12ch;
}

h2 {
  margin-top: 0;
  font-size: 28px;
  letter-spacing: -0.04em;
}

.lede,
.muted {
  color: var(--muted);
  line-height: 1.65;
}

.feature-list {
  display: grid;
  gap: 12px;
  margin-top: 30px;
}

.feature-list div {
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding: 14px 16px;
  border-radius: 18px;
  background: rgba(2, 6, 23, 0.48);
  border: 1px solid var(--border);
}

.feature-list strong {
  font-size: 14px;
}

.feature-list span {
  color: var(--muted);
}

.tabs {
  display: inline-flex;
  gap: 8px;
  padding: 6px;
  border-radius: 999px;
  background: rgba(2, 6, 23, 0.52);
  border: 1px solid var(--border);
  margin-bottom: 24px;
}

.tab {
  padding: 10px 16px;
  border-radius: 999px;
  background: transparent;
  color: var(--muted);
  border: 0;
}

.tab.is-active {
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  color: #00111f;
  font-weight: 800;
}

.stack {
  display: grid;
  gap: 12px;
  margin-top: 18px;
}

.mode {
  display: none;
}

.mode.is-active {
  display: block;
}

input, select {
  width: 100%;
  min-height: 48px;
  padding: 0 14px;
  border-radius: 14px;
  border: 1px solid var(--border);
  background: rgba(2, 6, 23, 0.64);
  color: var(--text);
  font: inherit;
}

.lang-select-wrap {
  margin-top: 18px;
}

.lang-select-wrap select {
  min-height: 40px;
  font-size: 13px;
}

.button {
  min-height: 48px;
  border-radius: 14px;
  padding: 0 16px;
  font-weight: 800;
  border: 0;
}

.button-primary {
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  color: #00111f;
}

.message {
  min-height: 22px;
  margin-top: 12px;
  color: var(--muted);
}

.message.ok {
  color: var(--accent-3);
}

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

.footer-links {
  display: flex;
  gap: 14px;
  margin-top: 20px;
}

.footer-links a {
  padding: 10px 14px;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: rgba(2, 6, 23, 0.48);
  color: var(--text);
}

@media (max-width: 980px) {
  .auth-shell {
    grid-template-columns: 1fr;
  }

  h1 {
    max-width: 100%;
  }
}