/* Layout Styles - Grid, Navigation, Containers */

/* Header */
.header {
    background: linear-gradient(135deg, var(--navy) 0%, var(--deep-blue) 100%);
    color: var(--warm-white);
    padding: 4rem 2rem 3rem;
    position: relative;
    overflow: hidden;
}

.header::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: 
        repeating-linear-gradient(
            90deg,
            transparent,
            transparent 50px,
            rgba(212, 175, 55, 0.03) 50px,
            rgba(212, 175, 55, 0.03) 51px
        );
    pointer-events: none;
}

.header-content {
    max-width: 1200px;
    margin: 0 auto;
    position: relative;
    z-index: var(--z-base);
}

/* Navigation Tabs */
.nav-tabs {
    background: white;
    border-bottom: 1px solid var(--light-gray);
    position: sticky;
    top: 0;
    z-index: var(--z-sticky);
    box-shadow: var(--shadow-sm);
}

.nav-tabs-content {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    gap: 0;
}

.nav-tab {
    padding: 1.25rem 2rem;
    font-family: var(--font-mono);
    font-size: 0.85rem;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--muted-gold);
    background: none;
    border: none;
    cursor: pointer;
    transition: all var(--transition-normal);
    border-bottom: 3px solid transparent;
    font-weight: 400;
}

.nav-tab:hover {
    color: var(--navy);
    background: rgba(212, 175, 55, 0.05);
}

.nav-tab.active {
    color: var(--navy);
    border-bottom-color: var(--accent-gold);
    font-weight: 500;
}

/* Tab Content */
.tab-content {
    display: none;
}

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

/* Container */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--spacing-2xl) var(--spacing-xl);
}

/* Grids */
.modules-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: var(--spacing-xl);
    margin-top: var(--spacing-2xl);
}

.tech-library-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 1.5rem;
    margin-top: var(--spacing-xl);
}

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

.success-metrics {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1.5rem;
    margin-top: 1rem;
}

.tech-return-buttons {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
}

/* Categories */
.tech-category {
    margin-bottom: var(--spacing-2xl);
}

.tech-category-title {
    font-size: 2rem;
    font-weight: 600;
    color: var(--navy);
    margin-bottom: 0.75rem;
    display: flex;
    align-items: center;
    gap: 1rem;
}

.tech-category-title::before {
    content: '';
    width: 4px;
    height: 2rem;
    background: var(--accent-gold);
    flex-shrink: 0;
}

.tech-category-desc {
    font-size: 1.15rem;
    color: var(--navy);
    margin-bottom: 1.75rem;
    font-style: italic;
    opacity: 0.85;
    line-height: 1.6;
}

/* Roadmap Section */
.roadmap-section {
    margin-bottom: var(--spacing-3xl);
}

.roadmap-header {
    text-align: center;
    margin-bottom: var(--spacing-2xl);
}

.roadmap-title {
    font-size: 2.8rem;
    font-weight: 600;
    color: var(--navy);
    margin-bottom: 1.25rem;
}

.roadmap-subtitle {
    font-size: 1.3rem;
    color: var(--navy);
    font-style: italic;
    opacity: 0.85;
    line-height: 1.6;
}

/* Animations */
@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

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

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(50px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Responsive */
@media (max-width: 768px) {
    h1 {
        font-size: 2.5rem;
    }

    .modules-grid,
    .tech-library-grid {
        grid-template-columns: 1fr;
    }

    .technique-grid,
    .success-metrics {
        grid-template-columns: 1fr;
    }
    
    .nav-tab {
        padding: 1rem 1.5rem;
        font-size: 0.8rem;
    }
}