/* ===================================
   CSS Custom Properties (Variables)
   =================================== */
:root {
    /* Colors - DoD/IC Professional Palette - Dark Green Theme */
    --color-bg-primary: rgb(12, 17, 15);
    --color-bg-secondary: rgb(18, 25, 22);
    --color-bg-card: rgba(5, 150, 105, 0.05);
    --color-accent-green: #059669;
    --color-accent-green-hover: #10b981;
    --color-accent-bright: #34d399;
    --color-text-primary: #f0fdf4;
    --color-text-muted: rgba(240, 253, 244, 0.7);
    --color-border: rgba(5, 150, 105, 0.15);
    --color-border-hover: rgba(5, 150, 105, 0.3);

    /* Typography - Technical/Military Aesthetic */
    --font-sans: 'SF Pro Display', -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', system-ui, sans-serif;
    --font-mono: 'SF Mono', 'Consolas', 'Monaco', 'Courier New', monospace;
    --font-technical: 'Inter', 'Roboto', system-ui, sans-serif;

    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 3rem;
    --spacing-xl: 4rem;
    --spacing-2xl: 6rem;

    /* Container */
    --container-max-width: 1200px;

    /* Border radius */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 250ms ease;
}

/* ===================================
   CSS Reset & Base Styles
   =================================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
    /* Prevent text size adjustment on mobile */
    -webkit-text-size-adjust: 100%;
    -moz-text-size-adjust: 100%;
    text-size-adjust: 100%;
}

body {
    font-family: var(--font-sans);
    background: var(--color-bg-primary);
    color: var(--color-text-primary);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    /* Prevent horizontal scroll on mobile */
    overflow-x: hidden;
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

a {
    color: var(--color-accent-green);
    text-decoration: none;
    transition: color var(--transition-fast);
}

a:hover {
    color: var(--color-accent-green-hover);
}

/* ===================================
   Container & Layout
   =================================== */
.container {
    max-width: var(--container-max-width);
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

main {
    min-height: calc(100vh - 200px);
}

/* ===================================
   Header
   =================================== */
.site-header {
    background: var(--color-bg-secondary);
    border-bottom: 1px solid var(--color-border);
    padding: var(--spacing-md) 0;
    position: sticky;
    top: 0;
    z-index: 100;
    backdrop-filter: blur(10px);
    overflow-x: hidden;
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    min-width: 0;
}

.logo {
    min-width: 0;
    flex-shrink: 0;
}

.logo a {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--color-text-primary);
    letter-spacing: 0.05em;
    text-transform: uppercase;
    font-family: var(--font-technical);
    white-space: nowrap;
}

.logo a:hover {
    color: var(--color-accent-green);
}

.main-nav {
    display: flex;
    gap: var(--spacing-lg);
    min-width: 0;
    flex-shrink: 1;
}

.main-nav a {
    color: var(--color-text-muted);
    font-weight: 500;
    transition: color var(--transition-base);
    position: relative;
}

.main-nav a:hover {
    color: var(--color-text-primary);
}

.main-nav a::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--color-accent-green);
    transition: width var(--transition-base);
}

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

/* ===================================
   Footer
   =================================== */
.site-footer {
    background: var(--color-bg-secondary);
    border-top: 1px solid var(--color-border);
    padding: var(--spacing-lg) 0;
    margin-top: var(--spacing-2xl);
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--spacing-md);
}

.footer-left p {
    color: var(--color-text-muted);
    font-size: 0.9rem;
}

.social-links {
    display: flex;
    gap: var(--spacing-md);
}

.social-links a {
    color: var(--color-text-muted);
    font-size: 0.9rem;
    text-transform: capitalize;
}

.social-links a:hover {
    color: var(--color-accent-green);
}

/* ===================================
   Hero Section
   =================================== */
.hero {
    padding: var(--spacing-2xl) 0;
    text-align: center;
    position: relative;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--color-border), transparent);
}

.hero-content {
    max-width: 800px;
    margin: 0 auto;
    animation: fadeInUp 0.8s ease-out;
}

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

.hero-logo {
    width: 100%;
    max-width: 200px;
    height: auto;
    margin: 0 auto var(--spacing-md);
    display: block;
    border-radius: var(--radius-md);
}

.hero-title {
    font-size: 3.5rem;
    font-weight: 400;
    letter-spacing: 0.01em;
    margin-bottom: var(--spacing-md);
    line-height: 1.2;
    text-transform: uppercase;
    font-family: var(--font-technical);
}

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--color-text-muted);
    margin-bottom: var(--spacing-lg);
    line-height: 1.6;
    font-weight: 300;
    letter-spacing: 0.01em;
}

.hero-cta {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
    flex-wrap: wrap;
}

/* ===================================
   Buttons
   =================================== */
.btn {
    display: inline-block;
    padding: 0.875rem 2rem;
    border-radius: var(--radius-md);
    font-weight: 500;
    text-align: center;
    transition: all var(--transition-base);
    cursor: pointer;
    border: 2px solid transparent;
}

.btn-primary {
    background: transparent;
    color: var(--color-text-primary);
    border-color: var(--color-border);
    font-weight: 600;
    letter-spacing: 0.02em;
}

.btn-primary:hover {
    border-color: var(--color-accent-green);
    background: rgba(5, 150, 105, 0.15);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(5, 150, 105, 0.4);
}

.btn-secondary {
    background: transparent;
    color: var(--color-text-primary);
    border-color: var(--color-border);
    font-weight: 600;
    letter-spacing: 0.02em;
}

.btn-secondary:hover {
    border-color: var(--color-accent-green);
    background: rgba(5, 150, 105, 0.15);
}

/* ===================================
   Sections
   =================================== */
.capabilities-preview,
.cta-section {
    padding: var(--spacing-2xl) 0;
}

.section-title {
    font-size: 2.5rem;
    font-weight: 500;
    text-align: center;
    margin-bottom: var(--spacing-xl);
    letter-spacing: 0.03em;
    text-transform: uppercase;
    font-family: var(--font-technical);
}

/* ===================================
   Cards
   =================================== */
.cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-lg);
}

.card {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    transition: all var(--transition-base);
    position: relative;
    overflow: hidden;
}

.card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 4px;
    height: 0;
    background: var(--color-accent-green);
    transition: height var(--transition-base);
}

.card:hover::before {
    height: 100%;
}

.card:hover {
    border-color: var(--color-border-hover);
    transform: translateY(-4px);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.3);
    background: rgba(255, 255, 255, 0.05);
}

.card h3 {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
    color: var(--color-text-primary);
    letter-spacing: 0.01em;
}

.card p {
    color: var(--color-text-muted);
    margin-bottom: var(--spacing-md);
}

.card-link {
    color: var(--color-accent-green);
    font-weight: 600;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 0;
    margin-top: 0.5rem;
}

.card-link:hover {
    color: var(--color-accent-green-hover);
}

/* ===================================
   CTA Section
   =================================== */
.cta-section {
    text-align: center;
    background: var(--color-bg-secondary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    margin: 0 var(--spacing-md);
    position: relative;
    overflow: hidden;
}

.cta-section::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(5, 150, 105, 0.1) 0%, transparent 70%);
    pointer-events: none;
}

.cta-section h2 {
    font-size: 2rem;
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
    letter-spacing: 0.02em;
    text-transform: uppercase;
    font-family: var(--font-technical);
    position: relative;
}

.cta-section p {
    color: var(--color-text-muted);
    font-size: 1.125rem;
    margin-bottom: var(--spacing-lg);
    position: relative;
}

/* ===================================
   Page Content
   =================================== */
.single-page,
.list-page {
    padding: var(--spacing-xl) 0;
}

.page-header {
    margin-bottom: var(--spacing-xl);
    padding-bottom: var(--spacing-md);
    border-bottom: 1px solid var(--color-border);
}

.page-header h1 {
    font-size: 2.5rem;
    font-weight: 500;
    margin-bottom: var(--spacing-sm);
    letter-spacing: 0.02em;
    text-transform: uppercase;
    font-family: var(--font-technical);
}

.page-meta {
    color: var(--color-text-muted);
    font-size: 0.95rem;
}

.page-intro {
    color: var(--color-text-muted);
    font-size: 1.125rem;
    margin-top: var(--spacing-md);
}

.page-content {
    font-size: 1.0625rem;
    line-height: 1.7;
}

.page-content h2 {
    font-size: 2rem;
    font-weight: 600;
    margin: var(--spacing-xl) 0 var(--spacing-md);
    color: var(--color-accent-bright);
    letter-spacing: 0.02em;
    text-transform: uppercase;
    font-family: var(--font-technical);
}

.page-content h3 {
    font-size: 1.5rem;
    font-weight: 600;
    margin: var(--spacing-lg) 0 var(--spacing-md);
    color: var(--color-text-primary);
    letter-spacing: 0.01em;
}

.page-content h4 {
    font-size: 1.25rem;
    font-weight: 500;
    margin: var(--spacing-md) 0 var(--spacing-sm);
    color: var(--color-text-primary);
}

.page-content p {
    margin-bottom: var(--spacing-md);
    color: var(--color-text-muted);
}

.page-content ul,
.page-content ol {
    margin: var(--spacing-md) 0;
    padding-left: var(--spacing-lg);
}

.page-content li {
    margin-bottom: var(--spacing-sm);
    color: var(--color-text-muted);
}

.page-content a {
    color: var(--color-accent-green);
    text-decoration: underline;
    text-decoration-color: rgba(5, 150, 105, 0.3);
    text-underline-offset: 2px;
}

.page-content a:hover {
    text-decoration-color: var(--color-accent-green);
}

.page-content code {
    background: var(--color-bg-secondary);
    padding: 0.2em 0.4em;
    border-radius: var(--radius-sm);
    font-family: var(--font-mono);
    font-size: 0.9em;
    border: 1px solid var(--color-border);
}

.page-content pre {
    background: var(--color-bg-secondary);
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    overflow-x: auto;
    margin: var(--spacing-md) 0;
    border: 1px solid var(--color-border);
}

.page-content pre code {
    background: none;
    padding: 0;
    border: none;
}

.page-content table {
    width: 100%;
    border-collapse: collapse;
    margin: var(--spacing-md) 0;
}

.page-content table th,
.page-content table td {
    padding: var(--spacing-sm);
    border: 1px solid var(--color-border);
    text-align: left;
}

.page-content table th {
    background: var(--color-bg-secondary);
    font-weight: 600;
}

.page-content table td {
    color: var(--color-text-muted);
}

.page-content blockquote {
    border-left: 3px solid var(--color-accent-green);
    padding-left: var(--spacing-md);
    margin: var(--spacing-md) 0;
    color: var(--color-text-muted);
    font-style: italic;
}

/* ===================================
   List Pages (Research, etc.)
   =================================== */
.list-content {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

.research-item,
.list-item {
    padding: var(--spacing-lg);
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    transition: all var(--transition-base);
    overflow-wrap: break-word;
    word-wrap: break-word;
}

.research-item:hover,
.list-item:hover {
    border-color: var(--color-border-hover);
    transform: translateX(4px);
}

.research-item h3,
.list-item h3 {
    font-size: 1.5rem;
    font-weight: 500;
    margin-bottom: var(--spacing-sm);
    overflow-wrap: break-word;
    word-wrap: break-word;
}

.research-item h3 a,
.list-item h3 a {
    color: var(--color-text-primary);
    overflow-wrap: break-word;
    word-wrap: break-word;
}

.research-item h3 a:hover,
.list-item h3 a:hover {
    color: var(--color-accent-green);
}

.item-meta {
    display: flex;
    gap: var(--spacing-md);
    align-items: center;
    margin-bottom: var(--spacing-sm);
    font-size: 0.9rem;
    color: var(--color-text-muted);
}

.tag {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    background: rgba(5, 150, 105, 0.2);
    color: var(--color-accent-green);
    border-radius: var(--radius-sm);
    font-size: 0.85rem;
    font-weight: 600;
}

.research-item p,
.list-item p {
    color: var(--color-text-muted);
}

/* ===================================
   Responsive Design
   =================================== */

/* Tablet and below */
@media (max-width: 768px) {
    /* Container padding for mobile */
    .container {
        padding: 0 var(--spacing-sm);
    }

    /* Header adjustments */
    .site-header {
        padding: var(--spacing-sm) 0;
    }

    .header-content {
        gap: 0.75rem;
    }

    .logo a {
        font-size: 0.8rem;
        letter-spacing: 0.01em;
    }

    .main-nav {
        gap: 0.5rem;
        flex-wrap: nowrap;
    }

    .main-nav a {
        font-size: 0.75rem;
        white-space: nowrap;
        padding: 0.35rem 0.5rem;
    }

    /* Hero section */
    .hero {
        padding: var(--spacing-xl) 0;
    }

    .hero-logo {
        max-width: 180px;
    }

    .hero-title {
        font-size: 2.5rem;
    }

    .hero-subtitle {
        font-size: 1.125rem;
        padding: 0 var(--spacing-md);
    }

    .hero-cta {
        flex-direction: column;
        width: 100%;
        max-width: 400px;
        margin: 0 auto;
    }

    .btn {
        width: 100%;
        text-align: center;
        min-height: 48px;
        display: flex;
        align-items: center;
        justify-content: center;
    }

    /* Section titles */
    .section-title {
        font-size: 2rem;
    }

    /* Page headers */
    .page-header {
        overflow-wrap: break-word;
        word-wrap: break-word;
    }

    .page-header h1 {
        font-size: 2rem;
        word-wrap: break-word;
        overflow-wrap: break-word;
        hyphens: auto;
    }

    .page-content {
        overflow-wrap: break-word;
        word-wrap: break-word;
        max-width: 100%;
    }

    .page-content h2 {
        font-size: 1.5rem;
        word-wrap: break-word;
    }

    .page-content h3 {
        font-size: 1.25rem;
        word-wrap: break-word;
    }

    .page-content p,
    .page-content li {
        overflow-wrap: break-word;
        word-wrap: break-word;
    }

    /* Cards */
    .cards {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
    }

    .card {
        padding: var(--spacing-md);
    }

    /* Footer */
    .footer-content {
        flex-direction: column;
        text-align: center;
        gap: var(--spacing-sm);
    }

    .footer-left p {
        font-size: 0.8rem;
    }

    .social-links {
        justify-content: center;
        gap: var(--spacing-sm);
        flex-wrap: wrap;
    }

    .social-links a {
        font-size: 0.8rem;
    }

    /* CTA Section */
    .cta-section {
        padding: var(--spacing-lg);
    }

    .cta-section h2 {
        font-size: 1.5rem;
    }

    .cta-section p {
        font-size: 1rem;
    }

    /* Sections spacing */
    .capabilities-preview,
    .cta-section {
        padding: var(--spacing-xl) 0;
    }
}

/* Mobile phones */
@media (max-width: 480px) {
    /* Container tighter on mobile */
    .container {
        padding: 0 var(--spacing-sm);
    }

    /* Even smaller spacing */
    .hero {
        padding: var(--spacing-lg) 0;
    }

    .hero-logo {
        max-width: 140px;
    }

    .hero-title {
        font-size: 2rem;
    }

    .hero-subtitle {
        font-size: 1rem;
        padding: 0 var(--spacing-sm);
    }

    .logo a {
        font-size: 0.75rem;
        letter-spacing: 0.005em;
    }

    .main-nav {
        gap: 0.4rem;
    }

    .main-nav a {
        font-size: 0.7rem;
        padding: 0.5rem 0.5rem;
        /* Better touch target - minimum 44x44px */
        min-height: 44px;
        display: flex;
        align-items: center;
    }

    .section-title {
        font-size: 1.75rem;
    }

    .page-header h1 {
        font-size: 1.75rem;
        word-wrap: break-word;
        overflow-wrap: break-word;
        hyphens: auto;
    }

    .page-intro {
        font-size: 1rem;
    }

    .btn {
        padding: 1rem 1.5rem;
        font-size: 1rem;
        /* Better touch target for buttons */
        min-height: 48px;
        display: flex;
        align-items: center;
        justify-content: center;
    }

    /* Cards - better spacing */
    .card {
        padding: var(--spacing-md);
    }

    .card h3 {
        font-size: 1.25rem;
    }

    /* Page content more readable */
    .page-content {
        font-size: 1rem;
    }

    /* Tables scroll on mobile */
    .page-content table {
        display: block;
        overflow-x: auto;
        white-space: nowrap;
    }

    /* Footer better spacing */
    .site-footer {
        padding: var(--spacing-md) 0;
    }

    .footer-left p {
        font-size: 0.75rem;
    }

    .social-links {
        gap: 0.5rem;
    }

    .social-links a {
        padding: 0.5rem 0.4rem;
        min-height: 44px;
        display: flex;
        align-items: center;
        font-size: 0.75rem;
    }
}

/* Very small devices */
@media (max-width: 360px) {
    .container {
        padding: 0 0.75rem;
    }

    .hero-logo {
        max-width: 110px;
    }

    .hero-title {
        font-size: 1.75rem;
    }

    .hero-subtitle {
        font-size: 0.95rem;
    }

    .section-title {
        font-size: 1.5rem;
        word-wrap: break-word;
    }

    .page-header h1 {
        font-size: 1.5rem;
        word-wrap: break-word;
        overflow-wrap: break-word;
    }

    .main-nav a {
        font-size: 0.65rem;
        padding: 0.5rem 0.4rem;
    }

    .logo a {
        font-size: 0.7rem;
        letter-spacing: 0;
    }

    .header-content {
        gap: 0.5rem;
    }

    .btn {
        padding: 0.875rem 1.25rem;
        font-size: 0.95rem;
    }

    .cta-section h2 {
        font-size: 1.25rem;
    }

    .cta-section p {
        font-size: 0.9rem;
    }

    /* Footer ultra compact */
    .footer-left p {
        font-size: 0.7rem;
    }

    .social-links {
        gap: 0.4rem;
    }

    .social-links a {
        padding: 0.5rem 0.3rem;
        font-size: 0.7rem;
    }
}