:root {
    --primary-color: #6366f1;
    --primary-dark: #4f46e5;
    --secondary-color: #8b5cf6;
    --success-color: #10b981;
    --danger-color: #ef4444;
    --warning-color: #f59e0b;
    --info-color: #06b6d4;
    --light-color: #f8fafc;
    --dark-color: #1e293b;
    --gray-100: #f1f5f9;
    --gray-200: #e2e8f0;
    --gray-300: #cbd5e1;
    --gray-400: #94a3b8;
    --gray-500: #64748b;
    --gray-600: #475569;
    --gray-700: #334155;
    --gray-800: #1e293b;
    --gray-900: #0f172a;
}

* {
    font-family: 'Assistant', 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

body {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    min-height: 100vh;
    margin: 0;
    padding: 0;
    position: relative;
    overflow-x: hidden;
}

    body::before {
        content: '';
        position: absolute;
        top: 0;
        left: 0;
        right: 0;
        bottom: 0;
        background-image: radial-gradient(circle at 20% 80%, rgba(120, 119, 198, 0.3) 0%, transparent 50%), radial-gradient(circle at 80% 20%, rgba(255, 255, 255, 0.1) 0%, transparent 50%);
        pointer-events: none;
    }

.auth-container {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    padding: 20px;
    position: relative;
    z-index: 1;
}

.auth-card {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(20px);
    border-radius: 24px;
    padding: 48px;
    width: 100%;
    max-width: 480px;
    box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04), 0 0 0 1px rgba(255, 255, 255, 0.2);
    border: 1px solid rgba(255, 255, 255, 0.2);
    position: relative;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

    .auth-card:hover {
        transform: translateY(-5px);
        box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.15), 0 20px 20px -5px rgba(0, 0, 0, 0.08);
    }

.auth-header {
    text-align: center;
    margin-bottom: 40px;
}

    .auth-header h2 {
        color: var(--gray-800);
        font-size: 2rem;
        font-weight: 600;
        margin-bottom: 12px;
        background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
        -webkit-background-clip: text;
        -webkit-text-fill-color: transparent;
        background-clip: text;
    }

    .auth-header p {
        color: var(--gray-600);
        font-size: 1.1rem;
        margin: 0;
    }

.form-floating {
    margin-bottom: 24px;
    position: relative;
}

    .form-floating > .form-control {
        border: 2px solid var(--gray-200);
        border-radius: 12px;
        padding: 18px 16px 6px 16px;
        height: auto;
        font-size: 1rem;
        transition: all 0.3s ease;
        background: rgba(255, 255, 255, 0.8);
        backdrop-filter: blur(10px);
    }

        .form-floating > .form-control:focus {
            border-color: var(--primary-color);
            box-shadow: 0 0 0 4px rgba(99, 102, 241, 0.1);
            outline: none;
            background: rgba(255, 255, 255, 0.95);
        }

    .form-floating > label {
        color: var(--gray-500);
        font-weight: 500;
        padding: 16px;
        transition: all 0.3s ease;
    }

    .form-floating > .form-control:focus ~ label,
    .form-floating > .form-control:not(:placeholder-shown) ~ label {
        opacity: 0.65;
        transform: scale(0.85) translateY(-0.5rem) translateX(0.15rem);
        color: var(--primary-color);
    }

.btn-primary {
    width: 100%;
    padding: 16px;
    border-radius: 12px;
    font-size: 1.1rem;
    font-weight: 500;
    border: none;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    color: white;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
    margin-bottom: 24px;
}

    .btn-primary::before {
        content: '';
        position: absolute;
        top: 0;
        left: -100%;
        width: 100%;
        height: 100%;
        background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
        transition: left 0.5s ease;
    }

    .btn-primary:hover::before {
        left: 100%;
    }

    .btn-primary:hover {
        transform: translateY(-2px);
        box-shadow: 0 10px 20px rgba(99, 102, 241, 0.3);
        background: linear-gradient(135deg, var(--primary-dark), var(--primary-color));
    }

.form-check {
    margin: 24px 0;
}

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

.form-check-label {
    color: var(--gray-600);
    font-weight: 500;
}

.auth-links {
    text-align: center;
    margin-top: 32px;
    padding-top: 24px;
    border-top: 1px solid var(--gray-200);
}

    .auth-links a {
        color: var(--primary-color);
        text-decoration: none;
        font-weight: 500;
        transition: color 0.3s ease;
    }

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

.text-danger {
    color: var(--danger-color) !important;
    font-size: 0.85rem;
    font-weight: 500;
    margin-top: 6px;
}

.validation-summary-errors {
    background: rgba(239, 68, 68, 0.1);
    border: 1px solid rgba(239, 68, 68, 0.2);
    border-radius: 12px;
    padding: 16px;
    margin-bottom: 24px;
    color: var(--danger-color);
}

    .validation-summary-errors ul {
        margin: 0;
        padding-right: 20px;
    }

.alert-danger {
    background: rgba(239, 68, 68, 0.1);
    border: 1px solid rgba(239, 68, 68, 0.2);
    color: var(--danger-color);
    border-radius: 12px;
    padding: 16px;
    margin-bottom: 24px;
}

/* Responsive Design */
@media (max-width: 768px) {
    .auth-card {
        padding: 32px 24px;
        margin: 10px;
        border-radius: 16px;
    }

    .auth-header h2 {
        font-size: 1.75rem;
    }
}

/* Loading Animation */
.btn-primary.loading {
    pointer-events: none;
    opacity: 0.8;
}

    .btn-primary.loading::after {
        content: '';
        position: absolute;
        width: 20px;
        height: 20px;
        border: 2px solid rgba(255, 255, 255, 0.3);
        border-radius: 50%;
        border-top-color: white;
        animation: spin 1s ease-in-out infinite;
        top: 50%;
        left: 50%;
        transform: translate(-50%, -50%);
    }

@keyframes spin {
    to {
        transform: translate(-50%, -50%) rotate(360deg);
    }
}