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

:root {
    --bentley-gold: #d4af37;
    --bentley-dark: #1a1a1a;
    --bentley-gray: #666;
    --bentley-light: #f5f5f5;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: #fff;
    color: var(--bentley-dark);
    line-height: 1.6;
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 20px;
}

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

.header h1 {
    font-size: 3rem;
    font-weight: 300;
    letter-spacing: 3px;
    margin-bottom: 20px;
    color: var(--bentley-dark);
}

.header p {
    font-size: 1.1rem;
    color: var(--bentley-gray);
    max-width: 800px;
    margin: 0 auto;
    line-height: 1.8;
}

.tabs-container {
    display: flex;
    gap: 30px;
    margin-top: 50px;
}

/* Navigation des tabs */
.tabs-nav {
    flex: 0 0 320px;
    background: var(--bentley-light);
    border-radius: 8px;
    padding: 20px;
    height: fit-content;
    position: sticky;
    top: 20px;
}

.tab-item {
    display: flex;
    align-items: center;
    gap: 20px;
    padding: 20px;
    margin-bottom: 10px;
    background: white;
    border: 2px solid transparent;
    border-radius: 6px;
    cursor: pointer;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.tab-item::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 0;
    background: var(--bentley-gold);
    transition: var(--transition);
}

.tab-item:hover {
    border-color: var(--bentley-gold);
    transform: translateX(5px);
}

.tab-item.preview {
    border-color: rgba(212, 175, 55, 0.5);
    transform: translateX(3px);
    background: rgba(212, 175, 55, 0.05);
}

.tab-item.active {
    border-color: var(--bentley-gold);
    background: linear-gradient(to right, rgba(212, 175, 55, 0.1), white);
}

.tab-item.active::before {
    width: 4px;
}

.tab-image {
    flex: 0 0 80px;
    height: 50px;
    position: relative;
    z-index: 1;
}

.tab-image img {
    width: 100%;
    height: 100%;
    object-fit: contain;
}

.tab-info {
    flex: 1;
    position: relative;
    z-index: 1;
}

.tab-name {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--bentley-dark);
    margin-bottom: 4px;
}

.tab-category {
    font-size: 0.85rem;
    color: var(--bentley-gray);
    text-transform: uppercase;
    letter-spacing: 1px;
}

/* Contenu des tabs */
.tabs-content {
    flex: 1;
    min-height: 600px;
}

.tab-panel {
    display: none;
    animation: fadeIn 0.5s ease;
}

.tab-panel.active {
    display: block;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.content-card {
    background: white;
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
}

.content-image {
    width: 100%;
    height: 500px;
    background: linear-gradient(135deg, #2d2d2d, #1a1a1a);
    position: relative;
    overflow: hidden;
}

.content-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.content-body {
    padding: 40px;
}

.content-title {
    font-size: 2.5rem;
    font-weight: 300;
    margin-bottom: 10px;
    letter-spacing: 2px;
}

.content-subtitle {
    font-size: 1rem;
    color: var(--bentley-gold);
    text-transform: uppercase;
    letter-spacing: 2px;
    margin-bottom: 30px;
}

.content-description {
    font-size: 1.1rem;
    line-height: 1.8;
    color: var(--bentley-gray);
    margin-bottom: 30px;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
    margin-top: 30px;
}

.feature-item {
    padding: 20px;
    background: var(--bentley-light);
    border-radius: 6px;
    border-left: 3px solid var(--bentley-gold);
}

.feature-label {
    font-size: 0.85rem;
    color: var(--bentley-gray);
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 8px;
}

.feature-value {
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--bentley-dark);
}

.cta-button {
    display: inline-block;
    padding: 15px 40px;
    background: var(--bentley-dark);
    color: white;
    text-decoration: none;
    text-transform: uppercase;
    letter-spacing: 2px;
    font-size: 0.9rem;
    border-radius: 4px;
    transition: var(--transition);
    margin-top: 30px;
    border: 2px solid var(--bentley-dark);
}

.cta-button:hover {
    background: transparent;
    color: var(--bentley-dark);
}

/* Responsive */
@media (max-width: 1024px) {
    .tabs-container {
        flex-direction: column;
    }

    .tabs-nav {
        flex: 1;
        position: static;
        display: grid;
        grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
        gap: 15px;
    }

    .tab-item {
        margin-bottom: 0;
    }
}

@media (max-width: 768px) {
    .header h1 {
        font-size: 2rem;
    }

    .tabs-nav {
        grid-template-columns: 1fr;
    }

    .content-image {
        height: 300px;
    }

    .content-body {
        padding: 25px;
    }

    .content-title {
        font-size: 1.8rem;
    }

    .features-grid {
        grid-template-columns: 1fr;
    }
}

/* Mobile menu toggle */
.mobile-toggle {
    display: none;
    width: 100%;
    padding: 15px;
    background: var(--bentley-dark);
    color: white;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    font-size: 1rem;
    margin-bottom: 20px;
    text-transform: uppercase;
    letter-spacing: 1px;
}

@media (max-width: 768px) {
    .mobile-toggle {
        display: block;
    }

    .tabs-nav.mobile-hidden {
        display: none;
    }
}