*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
body {
  font-family: 'Segoe UI', Arial, sans-serif;
  background: linear-gradient(135deg, #4F46E5 0%, #7C3AED 100%);
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1rem;
}
.login-card {
  background: #fff;
  border-radius: 16px;
  box-shadow: 0 25px 50px rgba(0,0,0,.25);
  padding: 2.5rem 2rem;
  width: 100%;
  max-width: 380px;
}
.login-logo {
  text-align: center;
  margin-bottom: 2rem;
}
.login-logo .icon { font-size: 2.5rem; }
.login-logo img { height: 90px; object-fit: contain; margin-bottom: .3rem; }
.login-logo h1 { font-size: 1.4rem; font-weight: 800; color: #1E293B; margin-top: .4rem; }
.login-logo p { font-size: .85rem; color: #64748B; margin-top: .2rem; }
.form-group { margin-bottom: 1rem; }
label { display: block; font-size: .82rem; font-weight: 600; color: #64748B; margin-bottom: .35rem; }
input {
  width: 100%;
  padding: .7rem .9rem;
  border: 1.5px solid #E2E8F0;
  border-radius: 8px;
  font-size: .95rem;
  color: #1E293B;
  outline: none;
  transition: border-color .15s;
  font-family: inherit;
  direction: ltr;
  text-align: left;
}
input:focus { border-color: #4F46E5; }
input.error { border-color: #DC2626; }
.error-msg {
  display: none;
  background: #FEF2F2;
  border: 1px solid #FECACA;
  color: #DC2626;
  border-radius: 8px;
  padding: .65rem .9rem;
  font-size: .875rem;
  margin-bottom: 1rem;
  text-align: center;
}
.error-msg.visible { display: block; }
.login-tabs {
  display: flex;
  background: #F1F5F9;
  border-radius: 10px;
  padding: 3px;
  margin-bottom: 1.4rem;
  gap: 3px;
}
.login-tab {
  flex: 1;
  padding: .5rem .4rem;
  border: none;
  border-radius: 8px;
  background: transparent;
  font-size: .83rem;
  font-weight: 600;
  color: #64748B;
  cursor: pointer;
  transition: background .15s, color .15s, box-shadow .15s;
  white-space: nowrap;
}
.login-tab.active {
  background: #fff;
  color: #4F46E5;
  box-shadow: 0 1px 4px rgba(0,0,0,.1);
}
#loginForm { display: none; }
#loginForm.active { display: block; }
#phoneForm.hidden { display: none; }
.btn-login {
  width: 100%;
  padding: .8rem;
  background: #4F46E5;
  color: #fff;
  border: none;
  border-radius: 8px;
  font-size: 1rem;
  font-weight: 700;
  cursor: pointer;
  transition: background .15s;
  margin-top: .5rem;
}
.btn-login:hover { background: #4338CA; }
.btn-login:disabled { opacity: .6; cursor: not-allowed; }

/* ─── OTP step ─────────────────────────────────────────────────────────────── */
.otp-step { text-align: center; }
.otp-icon { font-size: 2.6rem; margin-bottom: .4rem; }
.otp-title { font-size: 1.15rem; font-weight: 800; color: #1E293B; margin-bottom: .3rem; }
.otp-desc  { font-size: .84rem; color: #64748B; margin-bottom: 1.5rem; line-height: 1.5; }
.otp-inputs {
  display: flex;
  justify-content: center;
  gap: .5rem;
  margin-bottom: 1.25rem;
  direction: ltr;
}
.otp-digit {
  width: 46px;
  height: 56px;
  border: 2px solid #E2E8F0;
  border-radius: 10px;
  font-size: 1.5rem;
  font-weight: 800;
  text-align: center;
  color: #1E293B;
  outline: none;
  transition: border-color .15s, box-shadow .15s;
  padding: 0;
}
.otp-digit:focus {
  border-color: #4F46E5;
  box-shadow: 0 0 0 3px rgba(79,70,229,.15);
}
.otp-digit.shake {
  animation: shake .4s ease;
  border-color: #DC2626;
}
@keyframes shake {
  0%,100% { transform: translateX(0); }
  20%      { transform: translateX(-5px); }
  60%      { transform: translateX(5px); }
}
.otp-footer {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: .6rem;
  margin-top: .75rem;
  flex-wrap: wrap;
}
.otp-timer  { font-size: .78rem; color: #94A3B8; }
.otp-resend {
  background: none;
  border: none;
  color: #4F46E5;
  font-size: .82rem;
  font-weight: 600;
  cursor: pointer;
  padding: .2rem .4rem;
  border-radius: 5px;
  transition: background .12s;
}
.otp-resend:hover:not(:disabled) { background: #EEF2FF; }
.otp-resend:disabled { color: #CBD5E1; cursor: default; }
.otp-back {
  display: block;
  margin: .9rem auto 0;
  background: none;
  border: none;
  color: #94A3B8;
  font-size: .8rem;
  cursor: pointer;
  padding: .25rem .5rem;
  border-radius: 5px;
  transition: color .12s;
}
.otp-back:hover { color: #475569; }

/* ═══════════════════════════════════════════════════════════════════════
   DARK MODE
═══════════════════════════════════════════════════════════════════════ */
@media (prefers-color-scheme: dark) {
  body {
    background: linear-gradient(135deg, #1e1b4b 0%, #312e81 100%);
  }
  .login-card {
    background: #1e293b;
    box-shadow: 0 25px 50px rgba(0,0,0,.5);
  }
  .login-logo h1 { color: #f1f5f9; }
  .login-logo p  { color: #94a3b8; }
  label          { color: #94a3b8; }
  input {
    background: #0f172a;
    border-color: #334155;
    color: #f1f5f9;
  }
  input:focus { border-color: #818cf8; }
  input.error { border-color: #f87171; }
  .error-msg {
    background: #450a0a;
    border-color: #7f1d1d;
    color: #fca5a5;
  }
  .login-tabs  { background: #0f172a; }
  .login-tab   { color: #94a3b8; }
  .login-tab.active { background: #1e293b; color: #818cf8; box-shadow: 0 1px 4px rgba(0,0,0,.4); }
  .btn-login   { background: #6366f1; }
  .btn-login:hover { background: #4f46e5; }

  /* OTP */
  .otp-title   { color: #f1f5f9; }
  .otp-desc    { color: #94a3b8; }
  .otp-digit {
    background: #0f172a;
    border-color: #334155;
    color: #f1f5f9;
  }
  .otp-digit:focus { border-color: #818cf8; box-shadow: 0 0 0 3px rgba(129,140,248,.2); }
  .otp-digit.shake { border-color: #f87171; }
  .otp-timer  { color: #64748b; }
  .otp-resend { color: #818cf8; }
  .otp-resend:hover:not(:disabled) { background: #1e1b4b; }
  .otp-resend:disabled { color: #475569; }
  .otp-back   { color: #64748b; }
  .otp-back:hover { color: #94a3b8; }
}