*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  --bg-primary: #202124;
  --bg-secondary: #292a2d;
  --bg-card: #2d2e31;
  --bg-tertiary: #3c4043;
  --text-primary: #e8eaed;
  --text-secondary: #9aa0a6;
  --text-muted: #5f6368;
  --accent: #8ab4f8;
  --accent-hover: #aecbfa;
  --red: #f28b82;
  --green: #81c995;
  --border: #3c4043;
  --radius: 12px;
  --radius-sm: 8px;
}

html, body {
  height: 100%;
  font-family: 'Google Sans', 'Segoe UI', Roboto, -apple-system, sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
}

.login-container {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  padding: 20px;
}

.login-card {
  background: var(--bg-card);
  border-radius: 16px;
  padding: 48px 40px;
  width: 100%;
  max-width: 420px;
  box-shadow: 0 4px 24px rgba(0,0,0,0.4);
}

.login-header {
  text-align: center;
  margin-bottom: 32px;
}

.login-logo {
  height: 40px;
  max-width: 200px;
  width: auto;
  margin: 0 auto 16px;
  display: block;
  object-fit: contain;
}

.login-header h1 {
  font-size: 24px;
  font-weight: 600;
  margin-bottom: 6px;
}

.login-header p {
  color: var(--text-secondary);
  font-size: 14px;
}

.error-msg {
  background: rgba(242, 139, 130, 0.15);
  border: 1px solid var(--red);
  color: var(--red);
  padding: 10px 14px;
  border-radius: var(--radius-sm);
  font-size: 13px;
  margin-bottom: 16px;
  text-align: center;
}

.auth-form {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.form-group label {
  font-size: 13px;
  font-weight: 500;
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  gap: 6px;
}

.form-group label i {
  font-size: 14px;
}

.form-group input {
  width: 100%;
  padding: 12px 16px;
  background: var(--bg-primary);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-size: 15px;
  font-family: inherit;
  outline: none;
  transition: border-color 0.15s ease;
}

.form-group input:focus {
  border-color: var(--accent);
}

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

.btn-submit {
  width: 100%;
  padding: 14px 24px;
  background: var(--accent);
  color: #202124;
  border: none;
  border-radius: var(--radius);
  font-size: 15px;
  font-weight: 600;
  font-family: inherit;
  cursor: pointer;
  transition: background 0.15s ease;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  margin-top: 4px;
}

.btn-submit:hover {
  background: var(--accent-hover);
}

.btn-submit:disabled {
  opacity: 0.7;
  cursor: not-allowed;
}

.divider {
  display: flex;
  align-items: center;
  margin: 24px 0;
  gap: 16px;
}

.divider::before, .divider::after {
  content: '';
  flex: 1;
  height: 1px;
  background: var(--border);
}

.divider span {
  font-size: 12px;
  color: var(--text-muted);
}

.switch-mode {
  text-align: center;
  margin-top: 8px;
}

.link-btn {
  background: none;
  border: none;
  color: var(--text-secondary);
  font-size: 13px;
  cursor: pointer;
  font-family: inherit;
  padding: 8px;
}

.link-btn strong {
  color: var(--accent);
}

.link-btn:hover strong {
  color: var(--accent-hover);
}

@keyframes spin {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

.spin {
  display: inline-block;
  animation: spin 1s linear infinite;
}

/* Mobile */
@media (max-width: 480px) {
  .login-card {
    padding: 32px 20px;
    border-radius: 12px;
  }
  .login-header h1 {
    font-size: 20px;
  }
  .form-group input {
    font-size: 16px;
    padding: 14px 16px;
  }
}