:root {
    --primary: #2563eb;
    --primary-dark: #1d4ed8;
    --primary-light: #60a5fa;
    --secondary: #7c3aed;
    --success: #10b981;
    --warning: #f59e0b;
    --danger: #ef4444;
    --dark: #1f2937;
    --light: #f9fafb;
    --gray: #6b7280;
    --gray-light: #e5e7eb;
    --font-xs: 0.75rem;
    --font-sm: 0.875rem;
    --font-base: 1rem;
    --font-lg: 1.125rem;
    --font-xl: 1.25rem;
    --font-xxl: 1.5rem;
    --font-xxxl: 2rem;
}

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

body {
    font-family: 'Inter', sans-serif;
    font-size: var(--font-sm);
    line-height: 1.5;
    color: var(--dark);
    min-height: 100vh;
    overflow-x: hidden;
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    padding: 1rem;
    position: relative;
}

/* Animated Background */
.login-bg {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(45deg, rgba(37, 99, 235, 0.1) 0%, rgba(124, 58, 237, 0.1) 100%);
    z-index: -1;
}

/* Login Container */
.login-container {
    display: flex;
    max-width: 1200px;
    min-height: 700px;
    margin: 0 auto;
    background: white;
    border-radius: 16px;
    overflow: hidden;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.15);
    animation: fadeIn 0.6s ease-out;
    position: relative;
    z-index: 1;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Left Panel */
.login-left {
    flex: 1;
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    color: white;
    padding: 2.5rem;
    display: flex;
    flex-direction: column;
    position: relative;
    overflow: hidden;
}

    .login-left::before {
        content: '';
        position: absolute;
        top: 0;
        left: 0;
        right: 0;
        bottom: 0;
        background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 1000 1000"><path fill="rgba(255,255,255,0.05)" d="M0,0 L1000,0 L1000,1000 Z"/></svg>');
        background-size: cover;
        z-index: 0;
    }

.logo {
    display: flex;
    align-items: center;
    gap: 0.875rem;
    margin-bottom: 2.5rem;
    font-size: var(--font-xl);
    font-weight: 600;
    position: relative;
    z-index: 1;
}

    .logo i {
        font-size: var(--font-xxl);
        background: rgba(255, 255, 255, 0.1);
        padding: 0.75rem;
        border-radius: 12px;
    }

.login-content {
    flex: 1;
    position: relative;
    z-index: 1;
}

    .login-content h1 {
        font-size: var(--font-xxxl);
        font-weight: 600;
        margin-bottom: 1.25rem;
        line-height: 1.2;
    }

    .login-content p {
        font-size: var(--font-base);
        opacity: 0.9;
        margin-bottom: 2rem;
        line-height: 1.6;
    }

.features-list {
    list-style: none;
    margin: 2rem 0;
    padding: 0;
}

    .features-list li {
        display: flex;
        align-items: flex-start;
        gap: 1rem;
        margin-bottom: 1.25rem;
        font-size: var(--font-sm);
        line-height: 1.4;
    }

    .features-list i {
        color: #4ade80;
        font-size: var(--font-base);
        margin-top: 0.125rem;
        flex-shrink: 0;
    }

    .features-list span {
        flex: 1;
    }

.mt-4 {
    margin-top: 1.5rem;
    position: relative;
    z-index: 1;
}

.d-flex.align-items-center {
    margin-bottom: 0.75rem;
}

    .d-flex.align-items-center:last-child {
        margin-bottom: 0;
    }

.text-warning {
    color: #f59e0b !important;
}

.text-success {
    color: #10b981 !important;
}

.login-footer {
    font-size: var(--font-xs);
    opacity: 0.8;
    padding-top: 1.5rem;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    position: relative;
    z-index: 1;
    margin-top: auto;
}

/* Right Panel */
.login-right {
    flex: 1;
    padding: 2.5rem;
    display: flex;
    flex-direction: column;
    position: relative;
    overflow-y: auto;
}

.login-header {
    margin-bottom: 2.5rem;
    text-align: center;
}

    .login-header h2 {
        font-size: var(--font-xxl);
        font-weight: 600;
        color: var(--dark);
        margin-bottom: 0.5rem;
    }

    .login-header p {
        font-size: var(--font-sm);
        color: var(--gray);
        margin: 0;
    }

/* Form */
.login-form {
    max-width: 400px;
    width: 100%;
    margin: 0 auto;
    flex: 1;
}

.validation-summary-errors {
    background: #fef2f2;
    border: 1px solid #fee2e2;
    border-radius: 8px;
    padding: 1rem;
    margin-bottom: 1.5rem;
    font-size: var(--font-sm);
}

    .validation-summary-errors ul {
        list-style: none;
        margin: 0;
        padding: 0;
    }

    .validation-summary-errors li {
        color: var(--danger);
        margin-bottom: 0.25rem;
    }

        .validation-summary-errors li:last-child {
            margin-bottom: 0;
        }

.alert {
    padding: 0.875rem 1rem;
    border-radius: 8px;
    font-size: var(--font-sm);
    margin-bottom: 1.5rem;
    border: none;
}

.alert-success {
    background: #f0fdf4;
    color: #166534;
}

.alert-danger {
    background: #fef2f2;
    color: #991b1b;
}

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

.form-label {
    display: block;
    font-size: var(--font-sm);
    font-weight: 500;
    color: #374151;
    margin-bottom: 0.375rem;
}

.input-group {
    position: relative;
    border: 1px solid var(--gray-light);
    border-radius: 10px;
    transition: all 0.2s ease;
    overflow: hidden;
}

    .input-group.focused {
        border-color: var(--primary);
        box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
    }

.input-icon {
    position: absolute;
    left: 1rem;
    top: 50%;
    transform: translateY(-50%);
    color: var(--gray);
    font-size: var(--font-sm);
    z-index: 2;
}

.form-control {
    width: 100%;
    padding: 0.875rem 1rem 0.875rem 2.75rem;
    font-size: var(--font-sm);
    border: none;
    background: transparent;
    outline: none;
    color: var(--dark);
    position: relative;
    z-index: 1;
}

    .form-control::placeholder {
        color: #9ca3af;
        font-size: var(--font-sm);
    }

    .form-control.is-invalid {
        border: 1px solid var(--danger);
    }

.password-toggle {
    position: absolute;
    right: 1rem;
    top: 50%;
    transform: translateY(-50%);
    background: none;
    border: none;
    color: var(--gray);
    cursor: pointer;
    font-size: var(--font-sm);
    padding: 0.25rem;
    z-index: 2;
}

    .password-toggle:hover {
        color: var(--primary);
    }

.field-validation-error {
    font-size: var(--font-xs);
    color: var(--danger);
    margin-top: 0.375rem;
    display: block;
}

/* Remember Me & Forgot Password */
.d-flex.justify-content-between {
    margin-bottom: 1.5rem;
}

.form-check {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.form-check-input {
    width: 1rem;
    height: 1rem;
    margin-top: 0;
    cursor: pointer;
}

    .form-check-input:checked {
        background-color: var(--primary);
        border-color: var(--primary);
    }

.form-check-label {
    font-size: var(--font-sm);
    color: #4b5563;
    cursor: pointer;
}

a.text-decoration-none {
    color: var(--primary) !important;
    text-decoration: none !important;
    font-size: var(--font-sm);
    transition: color 0.2s ease;
}

    a.text-decoration-none:hover {
        color: var(--primary-dark) !important;
        text-decoration: underline !important;
    }

/* Submit Button */
.btn-login {
    width: 100%;
    padding: 1rem;
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    color: white;
    border: none;
    border-radius: 10px;
    font-size: var(--font-base);
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
    margin: 1.5rem 0;
    display: flex;
    align-items: center;
    justify-content: center;
}

    .btn-login:hover:not(.loading) {
        transform: translateY(-2px);
        box-shadow: 0 10px 25px rgba(37, 99, 235, 0.3);
    }

    .btn-login:active:not(.loading) {
        transform: translateY(0);
    }

    .btn-login.loading {
        opacity: 0.8;
        cursor: not-allowed;
    }

    .btn-login i {
        font-size: var(--font-base);
    }

/* Links */
.login-links {
    text-align: center;
    font-size: var(--font-sm);
    color: var(--gray);
    margin-top: 1.5rem;
    padding-top: 1.5rem;
    border-top: 1px solid var(--gray-light);
}

    .login-links span:first-child {
        color: var(--gray);
    }

    .login-links a {
        color: var(--primary);
        text-decoration: none;
        transition: color 0.2s ease;
    }

        .login-links a:hover {
            color: var(--primary-dark);
            text-decoration: underline;
        }

.separator {
    margin: 0 0.5rem;
    color: var(--gray);
}

/* Responsive */
@media (max-width: 992px) {
    .login-container {
        flex-direction: column;
        max-width: 500px;
        min-height: auto;
        margin: 1rem auto;
    }

    .login-left,
    .login-right {
        padding: 2rem;
    }

    .login-left {
        order: 2;
        min-height: 400px;
    }

    .login-right {
        order: 1;
        min-height: 500px;
    }

    .login-content h1 {
        font-size: var(--font-xxl);
    }

    .login-header h2 {
        font-size: var(--font-xl);
    }
}

@media (max-width: 576px) {
    .login-left, .login-right {
        padding: 1.5rem;
    }

    body {
        padding: 0.5rem;
    }

    .logo {
        font-size: var(--font-lg);
    }

        .logo i {
            font-size: var(--font-xl);
        }

    .login-content h1 {
        font-size: var(--font-xl);
    }

    .login-header h2 {
        font-size: var(--font-lg);
    }
}

@media (max-height: 800px) {
    .login-container {
        min-height: 600px;
    }
}

/* Loading Animation */
@keyframes spin {
    0% {
        transform: rotate(0deg);
    }

    100% {
        transform: rotate(360deg);
    }
}

.fa-spinner {
    animation: spin 1s linear infinite;
}