:root {
  --bg: #f1f5f9;
  --surface: #ffffff;
  --text: #1e293b;
  --text-muted: #64748b;
  --border: #e2e8f0;
  --accent: #000000;
  --radius: 10px;
  --radius-sm: 7px;
  --transition: .18s cubic-bezier(.4, 0, .2, 1);
}

*, *::before, *::after { box-sizing: border-box; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  -webkit-font-smoothing: antialiased;
}

/* ── Login Card ──────────────────────────────────────────── */
.login-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 14px;
  box-shadow: 0 4px 24px rgba(0, 0, 0, .07);
}

/* ── OTP Inputs ──────────────────────────────────────────── */
.otp-input {
  width: 46px !important;
  height: 52px;
  text-align: center;
  font-size: 1.25rem;
  font-weight: 600;
  padding: 0;
  margin: 0 3px;
  border: 1.5px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text);
  transition: border-color var(--transition), box-shadow var(--transition);
}
.otp-input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(0, 0, 0, .1);
  outline: none;
}
.otp-input.is-invalid {
  border-color: #dc3545;
}

/* ── States ──────────────────────────────────────────────── */
.resend-disabled {
  opacity: .4;
  pointer-events: none;
}

/* ── Animations ──────────────────────────────────────────── */
.fade-in-up {
  animation: fadeInUp .22s ease;
}
@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(6px); }
  to   { opacity: 1; transform: translateY(0); }
}

.transition-all {
  transition: all var(--transition);
}