/* Login Screen Styles */
.login-screen {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 9999;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen', 'Ubuntu', 'Cantarell', sans-serif;
}

.login-screen.hidden {
    display: none;
}

.login-container {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 100%;
    height: 100%;
    padding: var(--spacing-md);
}

.login-card {
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
    width: 100%;
    max-width: 420px;
    padding: var(--spacing-xl);
    animation: slideUp 0.5s ease-out;
}

.login-header {
    text-align: center;
    margin-bottom: var(--spacing-xl);
}

.login-title {
    font-size: 2.5rem;
    font-weight: 700;
    margin: 0 0 var(--spacing-sm) 0;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.login-title span {
    color: #667eea;
}

.login-subtitle {
    font-size: 0.95rem;
    color: var(--text-secondary);
    margin: 0;
}

.login-form {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

.login-form .form-group {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.login-form .form-group label {
    font-weight: 600;
    font-size: 0.9rem;
    color: var(--text-primary);
}

.login-form .form-group input[type="email"],
.login-form .form-group input[type="password"] {
    padding: var(--spacing-md);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    font-size: 0.95rem;
    background: var(--bg-input);
    color: var(--text-primary);
    transition: all 0.3s ease;
    font-family: inherit;
}

.login-form .form-group input[type="email"]:focus,
.login-form .form-group input[type="password"]:focus {
    outline: none;
    border-color: #667eea;
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
    background: var(--bg-card);
}

.login-form .form-group.checkbox {
    flex-direction: row;
    align-items: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-md);
}

.login-form .form-group.checkbox input[type="checkbox"] {
    width: 18px;
    height: 18px;
    cursor: pointer;
    accent-color: #667eea;
}

.login-form .form-group.checkbox label {
    margin: 0;
    cursor: pointer;
    font-weight: 500;
}

.btn-login {
    padding: var(--spacing-md) var(--spacing-lg);
    font-size: 1rem;
    font-weight: 600;
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    transition: all 0.3s ease;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.btn-login:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 25px rgba(102, 126, 234, 0.3);
}

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

.btn-login:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none;
}

.login-error {
    background: #fee;
    border: 2px solid #f66;
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
    color: #c33;
    font-size: 0.9rem;
    text-align: center;
    margin-top: var(--spacing-md);
    animation: shake 0.5s ease-in-out;
}

@keyframes shake {
    0%, 100% { transform: translateX(0); }
    25% { transform: translateX(-5px); }
    75% { transform: translateX(5px); }
}

.login-footer {
    text-align: center;
    margin-top: var(--spacing-xl);
    padding-top: var(--spacing-xl);
    border-top: 1px solid var(--border-color);
}

.demo-credentials {
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin: 0;
    font-family: 'Courier New', monospace;
    letter-spacing: 0.5px;
}

/* Responsive Design */
@media (max-width: 768px) {
    .login-card {
        max-width: 90%;
        padding: var(--spacing-lg);
    }

    .login-title {
        font-size: 2rem;
    }

    .login-subtitle {
        font-size: 0.9rem;
    }
}