.login-container {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, #000000 0%, #2a2a2a 100%);
    position: relative;
    overflow: hidden;
}

.background-decoration {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    pointer-events: none;
}

.decoration-circle {
    position: absolute;
    border-radius: 50%;
    border: 1px solid rgba(255, 255, 255, 0.1);
    animation: rotate linear infinite;
}

.decoration-1 {
    width: 400px;
    height: 400px;
    top: -200px;
    left: -200px;
    animation-duration: 20s;
}

.decoration-2 {
    width: 600px;
    height: 600px;
    bottom: -300px;
    right: -300px;
    animation-duration: 30s;
    animation-direction: reverse;
}

.decoration-3 {
    width: 300px;
    height: 300px;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    animation-duration: 25s;
}

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

.login-wrapper {
    position: relative;
    z-index: 1;
    width: 100%;
    max-width: 450px;
    padding: var(--spacing-xl);
}

.login-card {
    background: var(--color-white);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-xl);
    overflow: hidden;
}

.login-header {
    background: linear-gradient(135deg, #000000 0%, #2a2a2a 100%);
    padding: var(--spacing-2xl);
    text-align: center;
}

.logo-wrapper {
    margin-bottom: var(--spacing-md);
}

.system-title {
    color: var(--color-white);
}

.title-main {
    display: block;
    font-size: var(--font-size-2xl);
    font-weight: var(--font-weight-bold);
    letter-spacing: 1px;
}

.title-sub {
    display: block;
    font-size: var(--font-size-lg);
    font-weight: var(--font-weight-normal);
    color: var(--color-gray-400);
    margin-top: var(--spacing-xs);
}

.system-description {
    color: var(--color-gray-300);
    font-size: var(--font-size-sm);
}

.login-form {
    padding: var(--spacing-2xl);
}

.form-group {
    margin-bottom: var(--spacing-lg);
}

.form-label {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    color: var(--color-gray-700);
    margin-bottom: var(--spacing-sm);
}

.required-indicator {
    color: var(--color-error);
}

.input-wrapper {
    position: relative;
    display: flex;
    align-items: center;
}

.input-icon {
    position: absolute;
    left: var(--spacing-md);
    color: var(--color-gray-400);
    font-weight: var(--font-weight-semibold);
    pointer-events: none;
}

.form-input {
    width: 100%;
    padding: var(--spacing-sm) var(--spacing-md) var(--spacing-sm) calc(var(--spacing-2xl) + var(--spacing-sm));
    background: var(--color-gray-50);
    border: 2px solid transparent;
    border-radius: var(--radius-md);
    font-size: var(--font-size-base);
    transition: var(--transition-base);
}

.form-input:focus {
    background: var(--color-white);
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(0, 0, 0, 0.1);
}

.form-input.error {
    border-color: var(--color-error);
}

.password-toggle {
    position: absolute;
    right: var(--spacing-md);
    padding: 4px 8px;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 4px;
    cursor: pointer;
    font-size: 12px;
    color: var(--text-secondary);
    transition: all 0.2s;
}

.password-toggle:hover {
    background: var(--bg-hover);
    color: var(--text-primary);
    border-color: var(--accent-color);
}

.error-message {
    display: block;
    font-size: var(--font-size-sm);
    color: var(--color-error);
    margin-top: var(--spacing-xs);
    min-height: 20px;
    transition: var(--transition-base);
}

.checkbox-group {
    margin-bottom: var(--spacing-xl);
}

.checkbox-label {
    display: flex;
    align-items: center;
    cursor: pointer;
    user-select: none;
}

.checkbox-input {
    position: absolute;
    opacity: 0;
}

.checkbox-custom {
    width: 20px;
    height: 20px;
    border: 2px solid var(--color-gray-300);
    border-radius: var(--radius-sm);
    margin-right: var(--spacing-sm);
    transition: var(--transition-base);
    position: relative;
}

.checkbox-input:checked + .checkbox-custom {
    background: var(--color-primary);
    border-color: var(--color-primary);
}

.checkbox-input:checked + .checkbox-custom::after {
    content: '✓';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    color: var(--color-white);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-bold);
}

.checkbox-text {
    font-size: var(--font-size-sm);
    color: var(--color-gray-600);
}

.form-message {
    min-height: 24px;
    margin-bottom: var(--spacing-lg);
    padding: var(--spacing-sm);
    border-radius: var(--radius-md);
    font-size: var(--font-size-sm);
    text-align: center;
    transition: var(--transition-base);
}

.form-message.error {
    background: rgba(239, 68, 68, 0.1);
    color: var(--color-error);
}

.form-message.success {
    background: rgba(16, 185, 129, 0.1);
    color: var(--color-success);
}

.submit-button {
    width: 100%;
    padding: var(--spacing-md);
    background: var(--color-primary);
    color: var(--color-white);
    border-radius: var(--radius-md);
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-semibold);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    transition: var(--transition-base);
    position: relative;
}

.submit-button:hover:not(:disabled) {
    background: linear-gradient(135deg, #000000 0%, #4a4a4a 100%);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.submit-button:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.submit-button.loading .button-text,
.submit-button.loading .button-icon {
    opacity: 0;
}

.button-loader {
    position: absolute;
    width: 20px;
    height: 20px;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-top-color: var(--color-white);
    border-radius: 50%;
    animation: spin 0.6s linear infinite;
    opacity: 0;
    transition: var(--transition-base);
}

.submit-button.loading .button-loader {
    opacity: 1;
}

.login-footer {
    padding: 0 var(--spacing-2xl) var(--spacing-2xl);
}

.divider {
    height: 1px;
    background: var(--color-gray-200);
    margin-bottom: var(--spacing-lg);
}

.default-credentials {
    background: var(--color-gray-50);
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    border: 1px dashed var(--color-gray-300);
}

.credentials-title {
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-semibold);
    color: var(--color-gray-600);
    margin-bottom: var(--spacing-sm);
    text-align: center;
}

.credentials-info {
    display: flex;
    gap: var(--spacing-lg);
    justify-content: center;
    margin-bottom: var(--spacing-md);
}

.credential-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    font-size: var(--font-size-sm);
}

.credential-label {
    color: var(--color-gray-500);
}

.credential-value {
    font-family: var(--font-family-mono);
    background: var(--color-white);
    padding: 2px 6px;
    border-radius: var(--radius-sm);
    color: var(--color-primary);
    font-weight: var(--font-weight-medium);
}

.demo-fill-button {
    width: 100%;
    padding: var(--spacing-sm);
    background: var(--color-gray-100);
    color: var(--color-gray-700);
    border-radius: var(--radius-md);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    transition: var(--transition-base);
}

.demo-fill-button:hover {
    background: var(--color-gray-200);
}

@keyframes shake {
    0%, 100% { transform: translateX(0); }
    10%, 30%, 50%, 70%, 90% { transform: translateX(-5px); }
    20%, 40%, 60%, 80% { transform: translateX(5px); }
}

.shake {
    animation: shake 0.5s ease-in-out;
}

@media (max-width: 768px) {
    .login-wrapper {
        padding: var(--spacing-md);
    }
    
    .login-header,
    .login-form,
    .login-footer {
        padding: var(--spacing-lg);
    }
    
    .title-main {
        font-size: var(--font-size-xl);
    }
    
    .title-sub {
        font-size: var(--font-size-base);
    }
}

@media (max-width: 480px) {
    .login-wrapper {
        max-width: 350px;
    }
    
    .credentials-info {
        flex-direction: column;
        gap: var(--spacing-sm);
    }
}