/* Reset et base */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* Couleurs principales */
    --primary-color: #2563eb;
    --secondary-color: #7c3aed;
    --accent-color: #f59e0b;
    --success-color: #10b981;
    --warning-color: #f59e0b;
    --error-color: #ef4444;
    
    /* Couleurs neutres */
    --white: #ffffff;
    --gray-50: #f9fafb;
    --gray-100: #f3f4f6;
    --gray-200: #e5e7eb;
    --gray-300: #d1d5db;
    --gray-400: #9ca3af;
    --gray-500: #6b7280;
    --gray-600: #4b5563;
    --gray-700: #374151;
    --gray-800: #1f2937;
    --gray-900: #111827;
    
    /* Typographie */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 1.875rem;
    --font-size-4xl: 2.25rem;
    --font-size-5xl: 3rem;
    
    /* Espacements */
    --spacing-1: 0.25rem;
    --spacing-2: 0.5rem;
    --spacing-3: 0.75rem;
    --spacing-4: 1rem;
    --spacing-5: 1.25rem;
    --spacing-6: 1.5rem;
    --spacing-8: 2rem;
    --spacing-10: 2.5rem;
    --spacing-12: 3rem;
    --spacing-16: 4rem;
    --spacing-20: 5rem;
    
    /* Ombres */
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
    --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
    
    /* Transitions */
    --transition-fast: 150ms ease-in-out;
    --transition-normal: 300ms ease-in-out;
    --transition-slow: 500ms ease-in-out;
}

/* Base */
html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    line-height: 1.6;
    color: var(--gray-800);
    background-color: var(--white);
}

/* Container */
.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 var(--spacing-4);
}

/* Navigation avec topbar intégrée */
.navbar {
    background-color: var(--white);
    box-shadow: var(--shadow-sm);
    position: sticky;
    top: 0;
    z-index: 1000;
    padding: 0;
}

/* Topbar avec recherche */
.navbar-topbar {
    background: linear-gradient(135deg, var(--gray-50) 0%, var(--gray-100) 100%);
    padding: var(--spacing-3) 0;
    border-bottom: 1px solid var(--gray-200);
}

.navbar-topbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--spacing-4);
}

.navbar-main {
    padding: var(--spacing-4) 0;
}

.nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 var(--spacing-4);
}

.nav-brand a {
    display: flex;
    align-items: center;
    gap: var(--spacing-3);
    text-decoration: none;
    color: var(--primary-color);
    font-size: var(--font-size-2xl);
    font-weight: 700;
}

.nav-brand i {
    font-size: 2rem;
    color: var(--primary-color);
}

.nav-logo h1 {
    font-size: var(--font-size-2xl);
    font-weight: 700;
    color: var(--primary-color);
    margin: 0;
}

.nav-logo span {
    font-size: var(--font-size-sm);
    color: var(--gray-600);
    display: block;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: var(--spacing-8);
    align-items: center;
}

.nav-link {
    text-decoration: none;
    color: var(--gray-700);
    font-weight: 500;
    transition: color var(--transition-fast);
    position: relative;
}

.nav-link:hover {
    color: var(--primary-color);
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--primary-color);
    transition: width var(--transition-fast);
}

.nav-link:hover::after {
    width: 100%;
}

.nav-toggle {
    display: none;
    flex-direction: column;
    cursor: pointer;
    gap: 4px;
}

.nav-toggle span {
    width: 25px;
    height: 3px;
    background-color: var(--gray-700);
    transition: var(--transition-fast);
}

/* Hero Section */
.hero {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    color: var(--white);
    padding: var(--spacing-12) 0;
    max-height: 450px;
    min-height: 400px;
    display: flex;
    align-items: center;
    overflow: hidden;
}

.hero-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-16);
    align-items: center;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-4);
}

.hero-content h2 {
    font-size: var(--font-size-5xl);
    font-weight: 700;
    margin-bottom: var(--spacing-6);
    line-height: 1.2;
}

.hero-content p {
    font-size: var(--font-size-xl);
    margin-bottom: var(--spacing-8);
    opacity: 0.9;
}

.hero-buttons {
    display: flex;
    gap: var(--spacing-4);
    flex-wrap: wrap;
}

.hero-image {
    display: flex;
    justify-content: center;
    align-items: center;
}

.hero-graphic {
    width: 300px;
    height: 300px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    backdrop-filter: blur(10px);
}

.hero-graphic i {
    font-size: 8rem;
    opacity: 0.8;
}

/* Boutons */
.btn {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-2);
    padding: var(--spacing-4) var(--spacing-6);
    border-radius: 12px;
    text-decoration: none;
    font-weight: 600;
    font-size: var(--font-size-base);
    transition: all var(--transition-normal);
    border: 2px solid transparent;
    cursor: pointer;
    text-align: center;
    box-shadow: var(--shadow-sm);
    position: relative;
    overflow: hidden;
}

.btn::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;
}

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

.btn-primary {
    background-color: var(--accent-color);
    color: var(--white);
}

.btn-primary:hover {
    background-color: #d97706;
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn-secondary {
    background-color: transparent;
    color: var(--white);
    border-color: var(--white);
}

.btn-secondary:hover {
    background-color: var(--white);
    color: var(--primary-color);
}

.btn-outline {
    background-color: transparent;
    color: var(--primary-color);
    border-color: var(--primary-color);
}

.btn-outline:hover {
    background-color: var(--primary-color);
    color: var(--white);
}

/* Barre de recherche dans la topbar */
.materials-header {
    background: transparent;
    padding: 0;
    border-bottom: none;
}

.materials-header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--spacing-4);
}

.search-bar {
    display: flex;
    align-items: center;
    background: var(--white);
    border: 2px solid var(--gray-200);
    border-radius: 12px;
    padding: var(--spacing-2);
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-fast);
    min-width: 300px;
}

.search-bar:focus-within {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.search-bar input {
    flex: 1;
    border: none;
    outline: none;
    padding: var(--spacing-3) var(--spacing-4);
    font-size: var(--font-size-base);
    background: transparent;
    color: var(--gray-900);
}

.search-bar input::placeholder {
    color: var(--gray-400);
}

.search-bar button {
    background: var(--primary-color);
    color: var(--white);
    border: none;
    padding: var(--spacing-3) var(--spacing-4);
    border-radius: 8px;
    cursor: pointer;
    transition: all var(--transition-fast);
    margin-left: var(--spacing-2);
}

.search-bar button:hover {
    background: #1d4ed8;
    transform: translateY(-1px);
}

.advanced-search-link {
    display: flex;
    align-items: center;
    gap: var(--spacing-2);
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 500;
    transition: all var(--transition-fast);
}

.advanced-search-link:hover {
    color: #1d4ed8;
    transform: translateY(-1px);
}

/* Résultats de recherche */
.search-results {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--white);
    border: 1px solid var(--gray-200);
    border-radius: 12px;
    box-shadow: var(--shadow-xl);
    max-height: 400px;
    overflow-y: auto;
    z-index: 1000;
    display: none;
}

.search-results.active {
    display: block;
}

.search-result-item {
    padding: var(--spacing-3) var(--spacing-4);
    border-bottom: 1px solid var(--gray-100);
    cursor: pointer;
    transition: background-color var(--transition-fast);
}

.search-result-item:hover {
    background-color: var(--gray-50);
}

.search-result-item:last-child {
    border-bottom: none;
}

/* Sections */
.section-title {
    font-size: var(--font-size-4xl);
    font-weight: 700;
    text-align: center;
    margin-bottom: var(--spacing-16);
    color: var(--gray-800);
}

.materials {
    padding: var(--spacing-20) 0;
    background-color: var(--gray-50);
}

.materials-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-8);
    flex-wrap: wrap;
    gap: var(--spacing-4);
}

.materials-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: var(--spacing-8);
}

.material-card {
    background: linear-gradient(135deg, var(--white) 0%, var(--gray-50) 100%);
    padding: var(--spacing-8);
    border-radius: 20px;
    box-shadow: var(--shadow-md);
    transition: all var(--transition-normal);
    border: 2px solid var(--gray-200);
    position: relative;
    overflow: hidden;
}

.material-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
    transform: scaleX(0);
    transition: transform var(--transition-normal);
}

.material-card:hover::before {
    transform: scaleX(1);
}

.material-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-xl);
    border-color: var(--primary-color);
}

.material-icon {
    width: 90px;
    height: 90px;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    border-radius: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: var(--spacing-6);
    position: relative;
    box-shadow: var(--shadow-lg);
    transition: all var(--transition-normal);
}

.material-icon::after {
    content: '';
    position: absolute;
    inset: -2px;
    background: linear-gradient(45deg, var(--primary-color), var(--secondary-color), var(--accent-color));
    border-radius: 26px;
    z-index: -1;
    opacity: 0;
    transition: opacity var(--transition-normal);
}

.material-card:hover .material-icon::after {
    opacity: 1;
}

.material-icon i {
    font-size: 2.5rem;
    color: var(--white);
}

.material-card h3 {
    font-size: var(--font-size-2xl);
    font-weight: 600;
    margin-bottom: var(--spacing-4);
    color: var(--gray-800);
}

.material-card p {
    color: var(--gray-600);
    margin-bottom: var(--spacing-6);
    line-height: 1.6;
}

.material-properties {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-2);
    margin-bottom: var(--spacing-6);
}

.property {
    background: linear-gradient(135deg, var(--gray-100) 0%, var(--gray-200) 100%);
    color: var(--gray-700);
    padding: var(--spacing-2) var(--spacing-3);
    border-radius: 20px;
    font-size: var(--font-size-sm);
    font-weight: 500;
    border: 1px solid var(--gray-300);
    transition: all var(--transition-fast);
}

.material-card:hover .property {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    color: var(--white);
    border-color: transparent;
    transform: translateY(-1px);
}

.material-link {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-2);
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 600;
    padding: var(--spacing-3) var(--spacing-4);
    border-radius: 12px;
    background: linear-gradient(135deg, var(--gray-50) 0%, var(--gray-100) 100%);
    border: 2px solid var(--gray-200);
    transition: all var(--transition-normal);
    position: relative;
    overflow: hidden;
}

.material-link::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(37, 99, 235, 0.1), transparent);
    transition: left 0.5s;
}

.material-link:hover::before {
    left: 100%;
}

.material-link:hover {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    color: var(--white);
    border-color: transparent;
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.material-specs {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-2);
    margin-bottom: var(--spacing-6);
}

.spec {
    background-color: var(--gray-100);
    color: var(--gray-700);
    padding: var(--spacing-1) var(--spacing-3);
    border-radius: 20px;
    font-size: var(--font-size-sm);
    font-weight: 500;
}

/* Hero des pages de matériaux */
.material-hero {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    color: var(--white);
    padding: var(--spacing-8) 0;
    max-height: 350px;
    min-height: 300px;
    display: flex;
    align-items: center;
    overflow: hidden;
}

.material-hero-content {
    display: flex;
    align-items: center;
    gap: var(--spacing-8);
    max-width: 1000px;
    margin: 0 auto;
}

.material-hero-left {

    text-align: left;
    width: 20%;
}

.material-hero-right {
   
    display: flex;
    flex-direction: column;
    gap: var(--spacing-6);
   width: 80%;
}

.material-icon-large {
    width: 100px;
    height: 100px;
    background: linear-gradient(135deg, rgba(255, 255, 255, 0.2) 0%, rgba(255, 255, 255, 0.1) 100%);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    backdrop-filter: blur(15px);
    -webkit-backdrop-filter: blur(15px);
    border: 2px solid rgba(255, 255, 255, 0.2);
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
    transition: all var(--transition-normal);
}

.material-icon-large:hover {
    transform: scale(1.05);
    box-shadow: 0 12px 40px rgba(0, 0, 0, 0.2);
}

.material-icon-large i {
    font-size: 2.5rem;
    opacity: 0.95;
    color: var(--white);
}

.material-title {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: var(--spacing-3);
    background: linear-gradient(135deg, var(--white) 0%, rgba(255, 255, 255, 0.8) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.material-description {
    font-size: var(--font-size-lg);
    margin-bottom: var(--spacing-4);
    opacity: 0.95;
    line-height: 1.5;
}

.material-properties {
    display: flex;
    flex-direction: row;
    gap: var(--spacing-4);
    flex-wrap: wrap;
    justify-content: flex-start;
}

.material-properties .property {
    background: linear-gradient(135deg, rgba(255, 255, 255, 0.15) 0%, rgba(255, 255, 255, 0.08) 100%);
    padding: var(--spacing-4) var(--spacing-5);
    border-radius: 16px;
    backdrop-filter: blur(15px);
    -webkit-backdrop-filter: blur(15px);
    border: 1px solid rgba(255, 255, 255, 0.2);
    transition: all var(--transition-normal);
}

.material-properties .property:hover {
    transform: translateY(-2px);
    background: linear-gradient(135deg, rgba(255, 255, 255, 0.2) 0%, rgba(255, 255, 255, 0.12) 100%);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.15);
}

.property-label {
    display: block;
    font-size: var(--font-size-sm);
    opacity: 0.8;
    margin-bottom: var(--spacing-2);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.property-value {
    display: block;
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: var(--white);
}

/* Responsive pour les héros */
@media (max-width: 768px) {
    .material-hero-content {
        flex-direction: column;
        text-align: center;
        gap: var(--spacing-6);
    }
    
    .material-hero-left,
    .material-hero-right {
        flex: none;
        width: 100%;
    }
    
    .material-title {
        font-size: 2.5rem;
    }
    
    .material-description {
        font-size: var(--font-size-lg);
    }
    
    .material-properties {
        flex-direction: column;
        gap: var(--spacing-3);
        align-items: center;
    }
}

/* Features */
.features {
    padding: var(--spacing-20) 0;
    background-color: var(--white);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-8);
}

.feature {
    text-align: center;
    padding: var(--spacing-6);
}

.feature-icon {
    width: 80px;
    height: 80px;
    background: linear-gradient(135deg, var(--accent-color), var(--warning-color));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto var(--spacing-6);
}

.feature-icon i {
    font-size: 2rem;
    color: var(--white);
}

.feature h3 {
    font-size: var(--font-size-xl);
    font-weight: 600;
    margin-bottom: var(--spacing-4);
    color: var(--gray-800);
}

.feature p {
    color: var(--gray-600);
    line-height: 1.6;
}

/* Footer */
.footer {
    background-color: var(--gray-900);
    color: var(--white);
    padding: var(--spacing-16) 0 var(--spacing-8);
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-8);
    margin-bottom: var(--spacing-8);
}

.footer-section h3,
.footer-section h4 {
    margin-bottom: var(--spacing-4);
    color: var(--white);
}

.footer-section p {
    color: var(--gray-300);
    margin-bottom: var(--spacing-2);
}

.footer-section ul {
    list-style: none;
}

.footer-section ul li {
    margin-bottom: var(--spacing-2);
}

.footer-section ul li a {
    color: var(--gray-300);
    text-decoration: none;
    transition: color var(--transition-fast);
}

.footer-section ul li a:hover {
    color: var(--white);
}

.footer-bottom {
    border-top: 1px solid var(--gray-700);
    padding-top: var(--spacing-8);
    text-align: center;
    color: var(--gray-400);
}

/* Responsive Design */
@media (max-width: 768px) {
    .nav-menu {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background-color: var(--white);
        flex-direction: column;
        padding: var(--spacing-4);
        box-shadow: var(--shadow-lg);
        border-top: 1px solid var(--gray-200);
        gap: var(--spacing-2);
    }
    
    .nav-menu.active {
        display: flex;
    }
    
    .nav-toggle {
        display: flex;
    }
    
    .nav-link {
        padding: var(--spacing-3) var(--spacing-4);
        width: 100%;
        text-align: center;
        border-radius: var(--border-radius-md);
        transition: all var(--transition-fast);
    }
    
    .nav-link:hover {
        background-color: var(--gray-50);
    }
    
    .hero-container {
        grid-template-columns: 1fr;
        text-align: center;
        gap: var(--spacing-8);
    }
    
    .hero-content h2 {
        font-size: var(--font-size-4xl);
    }
    
    .hero-buttons {
        justify-content: center;
    }
    
    .materials-grid {
        grid-template-columns: 1fr;
    }
    
    .features-grid {
        grid-template-columns: 1fr;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        text-align: center;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 var(--spacing-3);
    }
    
    .hero {
        padding: var(--spacing-12) 0;
    }
    
    .hero-content h2 {
        font-size: var(--font-size-3xl);
    }
    
    .hero-content p {
        font-size: var(--font-size-lg);
    }
    
    .hero-buttons {
        flex-direction: column;
        align-items: center;
    }
    
    .btn {
        width: 100%;
        max-width: 280px;
    }
}

/* Animations */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.material-card,
.feature {
    animation: fadeInUp 0.6s ease-out;
}

/* Smooth scrolling pour les ancres */
html {
    scroll-padding-top: 100px;
}