* {
  box-sizing: border-box;
}
:root {
  --primary:     #25D366;
  --primary-dk:  #128C7E;
  --accent:      #FACC15;
  --bg:          #FFFFFF;
  --bg-sec:      #F8FAFC;
  --text:        #111827;
  --text-sec:    #6B7280;
  --border:      #E5E7EB;
  --success:     #16A34A;
  --danger:      #DC2626;
}

body {
  font-family: 'Segoe UI', system-ui, sans-serif;
  color: var(--text);
  background: var(--bg-sec);
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

/* ── NAVBAR ─────────────────────────────────────────── */
.navbar {
  background: #fff;
  border-bottom: 1px solid var(--border);
}

.navbar-brand {
  font-weight: 800;
  font-size: 1.25rem;
  color: var(--primary-dk) !important;
}

.navbar-brand span {
  color: var(--primary);
}

.btn-outline-brand {
  border: 2px solid var(--primary);
  color: var(--primary-dk);
  font-weight: 600;
  border-radius: 8px;
  padding: .4rem 1.1rem;
  background: transparent;
}

.btn-outline-brand:hover {
  background: var(--primary);
  color: #fff;
}

/* ── AUTH CONTAINER ─────────────────────────────────── */
.auth-wrapper {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 2rem 0;
}

.auth-card {
  background: #fff;
  border-radius: 16px;
  padding: 3rem;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.08);
  width: 100%;
  max-width: 420px;
}

.auth-header {
  text-align: center;
  margin-bottom: 2rem;
}

.auth-header h1 {
  font-size: 1.8rem;
  font-weight: 900;
  margin-bottom: 0.5rem;
}

.auth-header p {
  color: var(--text-sec);
  font-size: 0.95rem;
}

.form-group {
  margin-bottom: 1.5rem;
}

.form-group label {
  display: block;
  font-weight: 600;
  margin-bottom: 0.5rem;
  font-size: 0.9rem;
  color: var(--text);
}

.form-group input {
  width: 100%;
  padding: 0.75rem 1rem;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 1rem;
  transition: border-color 0.2s;
}

.form-group input:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(37, 211, 102, 0.1);
}

.form-group input::placeholder {
  color: var(--text-sec);
}

.btn-submit {
  width: 100%;
  padding: 0.85rem 1rem;
  background: var(--primary);
  color: #fff;
  border: none;
  border-radius: 8px;
  font-weight: 700;
  font-size: 1rem;
  cursor: pointer;
  transition: all 0.2s;
  margin-top: 0.5rem;
}

.btn-submit:hover {
  background: var(--primary-dk);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(37, 211, 102, 0.3);
}

.btn-submit:active {
  transform: translateY(0);
}

/* ── LINK TOGGLE ────────────────────────────────────── */
.auth-footer {
  text-align: center;
  margin-top: 1.5rem;
  font-size: 0.9rem;
  color: var(--text-sec);
}

.auth-footer a {
  color: var(--primary-dk);
  text-decoration: none;
  font-weight: 600;
  transition: color 0.2s;
}

.auth-footer a:hover {
  color: var(--primary);
}

/* ── ERROR MESSAGE ──────────────────────────────────── */
.error-message {
  background: #fee2e2;
  color: var(--danger);
  padding: 0.75rem 1rem;
  border-radius: 8px;
  margin-bottom: 1.5rem;
  font-size: 0.9rem;
  display: none;
}

.error-message.show {
  display: block;
}

/* ── SUCCESS MESSAGE ───────────────────────────────── */
.success-message {
  background: #dcfce7;
  color: var(--success);
  padding: 0.75rem 1rem;
  border-radius: 8px;
  margin-bottom: 1.5rem;
  font-size: 0.9rem;
  display: none;
}

.success-message.show {
  display: block;
}

/* ── FOOTER ─────────────────────────────────────────── */
footer {
  background: var(--text);
  color: rgba(255, 255, 255, 0.7);
  padding: 2rem 0;
  font-size: 0.88rem;
  border-top: 1px solid var(--border);
}

footer .brand {
  color: var(--primary);
  font-weight: 800;
  font-size: 1rem;
}

footer a {
  color: rgba(255, 255, 255, 0.6);
  text-decoration: none;
}

footer a:hover {
  color: var(--primary);
}

/* ── RESPONSIVE ────────────────────────────────────── */
@media (max-width: 576px) {
  .auth-card {
    padding: 2rem 1.5rem;
    margin: 0 1rem;
  }

  .auth-header h1 {
    font-size: 1.5rem;
  }
}