:root {
  --bg: #edf3fa;
  --card: rgba(255, 255, 255, 0.92);
  --text: #0f172a;
  --muted: #516075;
  --line: rgba(15, 23, 42, 0.12);
  --accent: #0f172a;
  --accent-2: #1d4ed8;
  --danger: #b91c1c;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
  color: var(--text);
  background:
    radial-gradient(1000px 420px at 0% 0%, rgba(14, 116, 144, 0.2), transparent 60%),
    radial-gradient(900px 440px at 100% 0%, rgba(29, 78, 216, 0.22), transparent 60%),
    linear-gradient(180deg, #f8fbff 0%, #e9f0f8 100%);
}

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

.auth-card {
  width: min(460px, 100%);
  padding: 28px;
  border-radius: 24px;
  background: var(--card);
  border: 1px solid rgba(255, 255, 255, 0.45);
  box-shadow: 0 28px 70px rgba(15, 23, 42, 0.18);
  backdrop-filter: blur(18px);
}

.auth-kicker {
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: #1d4ed8;
}

.auth-brand h1 {
  margin: 10px 0 10px;
  font-size: 32px;
  line-height: 1.05;
}

.auth-lead {
  margin: 0;
  color: var(--muted);
  line-height: 1.5;
}

.auth-tabs {
  margin-top: 24px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
  padding: 6px;
  border-radius: 16px;
  background: rgba(241, 245, 249, 0.9);
  border: 1px solid rgba(15, 23, 42, 0.06);
}

.auth-tab {
  border: 0;
  border-radius: 12px;
  padding: 11px 12px;
  font-size: 14px;
  font-weight: 700;
  color: var(--muted);
  background: transparent;
  cursor: pointer;
}

.auth-tab.active {
  color: #ffffff;
  background: linear-gradient(135deg, var(--accent) 0%, var(--accent-2) 100%);
  box-shadow: 0 10px 22px rgba(29, 78, 216, 0.28);
}

.auth-form {
  display: none;
  gap: 10px;
  margin-top: 20px;
}

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

.auth-label {
  font-size: 13px;
  font-weight: 700;
}

.auth-input {
  width: 100%;
  border-radius: 14px;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.98);
  padding: 13px 14px;
  font-size: 15px;
  outline: none;
  transition: border-color 0.18s ease, box-shadow 0.18s ease;
}

.auth-input:focus {
  border-color: rgba(29, 78, 216, 0.45);
  box-shadow: 0 0 0 4px rgba(29, 78, 216, 0.12);
}

.auth-hint {
  font-size: 12px;
  line-height: 1.45;
  color: var(--muted);
  background: rgba(219, 234, 254, 0.65);
  border: 1px solid rgba(147, 197, 253, 0.6);
  border-radius: 14px;
  padding: 10px 12px;
}

.auth-error {
  min-height: 18px;
  font-size: 12px;
  color: var(--danger);
}

.auth-submit {
  margin-top: 4px;
  border: 0;
  border-radius: 14px;
  padding: 14px 16px;
  background: linear-gradient(135deg, var(--accent) 0%, var(--accent-2) 100%);
  color: #ffffff;
  font-size: 15px;
  font-weight: 800;
  cursor: pointer;
  box-shadow: 0 16px 28px rgba(29, 78, 216, 0.26);
}

.auth-submit:disabled {
  opacity: 0.6;
  cursor: wait;
}

.auth-link-btn {
  border: 0;
  background: transparent;
  color: var(--accent-2);
  font-size: 14px;
  font-weight: 700;
  cursor: pointer;
  padding: 8px 10px;
}

.auth-link-btn:disabled {
  opacity: 0.6;
  cursor: wait;
}

@media (max-width: 640px) {
  .auth-shell {
    padding: 16px;
  }

  .auth-card {
    padding: 22px 18px;
    border-radius: 20px;
  }

  .auth-brand h1 {
    font-size: 28px;
  }
}