:root {
  --bg: #020617;
  --card: #ffffff;
  --text: #0f172a;
  --muted: #64748b;
  --border: #e2e8f0;
  --primary: #2563eb;
  --primary-dark: #1d4ed8;
  --danger: #dc2626;
  --shadow: 0 30px 90px rgba(2, 6, 23, 0.42);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  color: var(--text);
  font-family: Inter, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background:
    radial-gradient(circle at 20% 18%, rgba(37, 99, 235, 0.38), transparent 30%),
    radial-gradient(circle at 82% 12%, rgba(14, 165, 233, 0.22), transparent 28%),
    linear-gradient(135deg, #020617, #0f172a 58%, #111827);
}

.auth-page {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 24px;
}

.auth-card {
  width: 100%;
  max-width: 430px;
  padding: 30px;
  border: 1px solid rgba(255, 255, 255, 0.28);
  border-radius: 28px;
  background: var(--card);
  box-shadow: var(--shadow);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  color: var(--text);
  text-decoration: none;
  font-size: 17px;
  font-weight: 950;
  letter-spacing: -0.02em;
}

.brand-mark {
  width: 40px;
  height: 40px;
  display: grid;
  place-items: center;
  border-radius: 15px;
  background: var(--primary);
  color: #ffffff;
  box-shadow: 0 14px 32px rgba(37, 99, 235, 0.32);
}

.auth-header {
  margin: 30px 0 22px;
}

.auth-header h1 {
  margin: 0 0 8px;
  font-size: 30px;
  line-height: 1.1;
  letter-spacing: -0.045em;
}

.auth-header p {
  margin: 0;
  color: var(--muted);
  font-size: 15px;
  line-height: 1.55;
}

.tabs {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 6px;
  padding: 5px;
  margin-bottom: 20px;
  border-radius: 16px;
  background: #f1f5f9;
}

.tab {
  height: 42px;
  border: 0;
  border-radius: 12px;
  background: transparent;
  color: #475569;
  font-size: 14px;
  font-weight: 850;
  cursor: pointer;
}

.tab.active {
  background: #ffffff;
  color: var(--text);
  box-shadow: 0 8px 20px rgba(15, 23, 42, 0.08);
}

.form-error {
  display: none;
  margin-bottom: 14px;
  padding: 12px 13px;
  border: 1px solid rgba(220, 38, 38, 0.18);
  border-radius: 14px;
  background: rgba(220, 38, 38, 0.08);
  color: var(--danger);
  font-size: 13px;
  font-weight: 800;
  line-height: 1.45;
}

.form-error.visible {
  display: block;
}

.auth-form {
  display: none;
}

.auth-form.active {
  display: block;
}

.field {
  display: block;
  margin-bottom: 16px;
}

.field span {
  display: block;
  margin-bottom: 8px;
  font-size: 14px;
  font-weight: 850;
}

input {
  width: 100%;
  height: 48px;
  padding: 0 14px;
  border: 1px solid var(--border);
  border-radius: 14px;
  background: #f8fafc;
  color: var(--text);
  font-size: 15px;
  outline: none;
}

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

input:focus {
  border-color: rgba(37, 99, 235, 0.72);
  background: #ffffff;
  box-shadow: 0 0 0 4px rgba(37, 99, 235, 0.13);
}

.button {
  width: 100%;
  height: 50px;
  border: 0;
  border-radius: 14px;
  font-size: 15px;
  font-weight: 950;
  cursor: pointer;
}

.button-primary {
  background: var(--primary);
  color: #ffffff;
  box-shadow: 0 18px 36px rgba(37, 99, 235, 0.28);
}

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

.auth-footer {
  margin-top: 18px;
  padding-top: 18px;
  border-top: 1px solid var(--border);
  color: var(--muted);
  font-size: 13px;
  line-height: 1.5;
}

.auth-footer p {
  margin: 0 0 10px;
}

.auth-footer strong {
  color: var(--text);
}

.auth-footer a {
  color: var(--primary);
  font-weight: 850;
  text-decoration: none;
}

.auth-footer a:hover {
  text-decoration: underline;
}

@media (max-width: 520px) {
  .auth-page {
    padding: 14px;
  }

  .auth-card {
    padding: 24px;
    border-radius: 24px;
  }

  .auth-header h1 {
    font-size: 26px;
  }
}