:root {
    --primary: #1a237e;
    --primary-light: #283593;
    --primary-dark: #0d1458;
    --secondary: #1976d2;
    --accent: #00bcd4;
    --success: #388e3c;
    --warning: #f57c00;
    --danger: #d32f2f;
    --info: #00897b;
    --light: #f8f9fa;
    --dark: #212529;
    --gray: #6c757d;
    --border-radius: 12px;
    --box-shadow: 0 10px 30px rgba(0, 0, 0, 0.08);
    --transition: all 0.3s ease;
}

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

body {
    font-family: 'Segoe UI', 'Roboto', 'Helvetica Neue', Arial, sans-serif;
    background-color: #f5f7fa;
    color: var(--dark);
    line-height: 1.6;
}

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

/* Header Styles */
.main-header {
    background: linear-gradient(135deg, var(--primary), var(--primary-light));
    color: white;
    padding: 20px 0;
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    display: flex;
    align-items: center;
    gap: 15px;
}

.logo-icon {
    font-size: 32px;
    color: white;
}

.logo-text {
    font-size: 24px;
    font-weight: 700;
}

.nav-menu {
    display: flex;
    gap: 30px;
}

.nav-link {
    color: rgba(255, 255, 255, 0.85);
    text-decoration: none;
    font-weight: 500;
    transition: var(--transition);
    padding: 8px 0;
    position: relative;
}

.nav-link:hover {
    color: white;
}

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

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

/* Hero Section */
.hero-section {
    background: linear-gradient(135deg, #1a237e 0%, #283593 100%);
    color: white;
    padding: 80px 0;
    position: relative;
    overflow: hidden;
}

.hero-content {
    max-width: 800px;
    margin: 0 auto;
    text-align: center;
    position: relative;
    z-index: 2;
}

.hero-title {
    font-size: 48px;
    font-weight: 700;
    margin-bottom: 20px;
    line-height: 1.2;
}

.hero-subtitle {
    font-size: 20px;
    margin-bottom: 30px;
    opacity: 0.9;
    line-height: 1.6;
}

.hero-badge {
    display: inline-block;
    background: rgba(255, 255, 255, 0.15);
    padding: 8px 20px;
    border-radius: 50px;
    font-size: 14px;
    margin-bottom: 30px;
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.hero-buttons {
    display: flex;
    gap: 15px;
    justify-content: center;
    margin-top: 40px;
}

.btn {
    padding: 12px 30px;
    border-radius: 8px;
    font-weight: 600;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    transition: var(--transition);
    border: none;
    cursor: pointer;
    font-size: 16px;
}

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

.btn-primary:hover {
    background-color: #00a5bb;
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(0, 188, 212, 0.3);
}

.btn-secondary {
    background-color: transparent;
    color: white;
    border: 2px solid rgba(255, 255, 255, 0.3);
}

.btn-secondary:hover {
    background-color: rgba(255, 255, 255, 0.1);
    transform: translateY(-2px);
}

/* Section Styles */
.section {
    padding: 80px 0;
}

.section-header {
    text-align: center;
    margin-bottom: 60px;
}

.section-title {
    font-size: 36px;
    font-weight: 700;
    color: var(--primary);
    margin-bottom: 15px;
}

.section-subtitle {
    font-size: 18px;
    color: var(--gray);
    max-width: 700px;
    margin: 0 auto;
}

/* Framework Layers */
.framework-layers {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 30px;
    margin-bottom: 40px;
}

.layer-card {
    background: white;
    border-radius: var(--border-radius);
    padding: 30px;
    box-shadow: var(--box-shadow);
    transition: var(--transition);
    text-decoration: none;
    color: inherit;
    display: block;
    position: relative;
    overflow: hidden;
    border-top: 4px solid;
    height: 100%;
}

.layer-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 15px 40px rgba(0, 0, 0, 0.15);
}

.layer-icon {
    font-size: 32px;
    margin-bottom: 20px;
    width: 70px;
    height: 70px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--primary), var(--primary-light));
    color: white;
    transition: var(--transition);
}

.layer-card:hover .layer-icon {
    transform: scale(1.1);
}

.layer-title {
    font-size: 22px;
    font-weight: 700;
    color: var(--primary);
    margin-bottom: 15px;
}

.layer-filename {
    font-size: 14px;
    color: var(--gray);
    font-family: 'Courier New', monospace;
    background: #f5f5f5;
    padding: 5px 10px;
    border-radius: 5px;
    margin-bottom: 15px;
    display: inline-block;
}

.layer-description {
    font-size: 15px;
    color: var(--gray);
    line-height: 1.6;
    margin-bottom: 20px;
}

.layer-link {
    color: var(--secondary);
    font-weight: 600;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: 5px;
    transition: var(--transition);
}

.layer-link:hover {
    color: var(--primary);
    gap: 10px;
}

/* Color variants for layers */
.layer-card-1 { border-color: #1976d2; }
.layer-card-1 .layer-icon { background: linear-gradient(135deg, #1976d2, #64b5f6); }

.layer-card-2 { border-color: #388e3c; }
.layer-card-2 .layer-icon { background: linear-gradient(135deg, #388e3c, #66bb6a); }

.layer-card-3 { border-color: #f57c00; }
.layer-card-3 .layer-icon { background: linear-gradient(135deg, #f57c00, #ffa726); }

.layer-card-4 { border-color: #7b1fa2; }
.layer-card-4 .layer-icon { background: linear-gradient(135deg, #7b1fa2, #ab47bc); }

.layer-card-5 { border-color: #00897b; }
.layer-card-5 .layer-icon { background: linear-gradient(135deg, #00897b, #26a69a); }

.layer-card-6 { border-color: #d32f2f; }
.layer-card-6 .layer-icon { background: linear-gradient(135deg, #d32f2f, #ef5350); }


/* Toolkit Section */
.toolkit-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 30px;
}

.toolkit-card {
    background: white;
    border-radius: var(--border-radius);
    padding: 30px;
    box-shadow: var(--box-shadow);
    transition: var(--transition);
    text-decoration: none;
    color: inherit;
    display: flex;
    flex-direction: column;
    border-left: 5px solid var(--primary);
}

.toolkit-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 15px 40px rgba(0, 0, 0, 0.15);
}

.toolkit-card-header {
    display: flex;
    align-items: center;
    gap: 20px;
    margin-bottom: 20px;
}

.toolkit-icon {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    background: linear-gradient(135deg, var(--primary), var(--primary-light));
    color: white;
    flex-shrink: 0;
}

.toolkit-title {
    font-size: 20px;
    font-weight: 700;
    color: var(--primary);
    margin-bottom: 5px;
}

.toolkit-filename {
    font-size: 12px;
    color: var(--gray);
    font-family: 'Courier New', monospace;
    background: #f5f5f5;
    padding: 3px 8px;
    border-radius: 4px;
    display: inline-block;
}

.toolkit-description {
    font-size: 15px;
    color: var(--gray);
    line-height: 1.6;
    margin-bottom: 20px;
    flex-grow: 1;
}

.toolkit-link {
    color: var(--secondary);
    font-weight: 600;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: 5px;
    transition: var(--transition);
}

.toolkit-link:hover {
    color: var(--primary);
    gap: 10px;
}

/* Footer */
.main-footer {
    background: linear-gradient(135deg, var(--primary-dark), var(--primary));
    color: white;
    padding: 60px 0 30px;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 40px;
    margin-bottom: 40px;
}

.footer-column h3 {
    font-size: 20px;
    margin-bottom: 20px;
    position: relative;
    padding-bottom: 10px;
}

.footer-column h3::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 40px;
    height: 3px;
    background-color: var(--accent);
}

.footer-links {
    list-style: none;
}

.footer-links li {
    margin-bottom: 12px;
}

.footer-links a {
    color: rgba(255, 255, 255, 0.8);
    text-decoration: none;
    transition: var(--transition);
    display: flex;
    align-items: center;
    gap: 8px;
}

.footer-links a:hover {
    color: white;
    transform: translateX(5px);
}

.footer-bottom {
    text-align: center;
    padding-top: 30px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    color: rgba(255, 255, 255, 0.7);
    font-size: 14px;
}

/* Responsive Styles */
@media (max-width: 1200px) {
    .layers-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 992px) {
    .hero-title {
        font-size: 40px;
    }
    
    .section-title {
        font-size: 32px;
    }
    
    .framework-layers, .toolkit-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .header-content {
        flex-direction: column;
        gap: 20px;
    }
    
    .nav-menu {
        flex-wrap: wrap;
        justify-content: center;
        gap: 15px;
    }
    
    .hero-title {
        font-size: 32px;
    }
    
    .hero-subtitle {
        font-size: 18px;
    }
    
    .hero-buttons {
        flex-direction: column;
        align-items: center;
    }
    
    .section {
        padding: 60px 0;
    }
    
    .section-title {
        font-size: 28px;
    }
    
    .framework-layers, .toolkit-grid, .layers-grid {
        grid-template-columns: 1fr;
    }
    
    .transversal-layer {
        width: 95%;
    }
}

@media (max-width: 576px) {
    .hero-section {
        padding: 60px 0;
    }
    
    .layer-card, .toolkit-card {
        padding: 20px;
    }
    
    .architecture-diagram {
        padding: 20px;
    }
}