/* ===================================
   TITAN SPACE - Design System
   Inspired by SpaceX & Anduril
   =================================== */

/* === CSS Variables === */
:root {
    /* Colors */
    --color-background: #000000;
    --color-surface: #0a0a0a;
    --color-surface-elevated: #141414;
    --color-text-primary: #ffffff;
    --color-text-secondary: #a0a0a0;
    --color-text-tertiary: #666666;
    --color-accent: #0066ff;
    --color-accent-hover: #0052cc;
    --color-border: #1a1a1a;

    /* Typography */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.5rem;
    --font-size-2xl: 2rem;
    --font-size-3xl: 3rem;
    --font-size-4xl: 4rem;

    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-2xl: 4rem;
    --spacing-3xl: 6rem;

    /* Layout */
    --container-max-width: 1400px;
    --nav-height: 80px;

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 300ms ease;
    --transition-slow: 500ms ease;
}

/* === Reset & Base === */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    line-height: 1.6;
    color: var(--color-text-primary);
    background-color: var(--color-background);
    overflow-x: hidden;
}

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

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

button {
    font-family: inherit;
    cursor: pointer;
    border: none;
    background: none;
}

ul {
    list-style: none;
}

/* === Typography === */
h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    line-height: 1.2;
    letter-spacing: -0.02em;
}

h1 { font-size: var(--font-size-4xl); }
h2 { font-size: var(--font-size-3xl); }
h3 { font-size: var(--font-size-2xl); }
h4 { font-size: var(--font-size-xl); }

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

/* === Navigation === */
.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--nav-height);
    background: rgba(0, 0, 0, 0.8);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--color-border);
    z-index: 1000;
    transition: background var(--transition-base);
}

.nav-container {
    max-width: var(--container-max-width);
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo {
    font-size: var(--font-size-xl);
    font-weight: 700;
    letter-spacing: 0.1em;
    color: var(--color-text-primary);
    line-height: 1.2;
    display: inline-block;
}

.nav-menu {
    display: flex;
    gap: var(--spacing-xl);
    align-items: center;
}

.nav-link {
    font-size: var(--font-size-sm);
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--color-text-secondary);
    transition: color var(--transition-fast);
}

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

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 6px;
    width: 30px;
    height: 24px;
}

.nav-toggle span {
    display: block;
    width: 100%;
    height: 2px;
    background: var(--color-text-primary);
    transition: transform var(--transition-base);
}

/* === Hero Section === */
.hero {
    position: relative;
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

.hero-background {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, #000814 0%, #001d3d 100%);
    z-index: 1;
}

.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: radial-gradient(circle at center, transparent 0%, rgba(0,0,0,0.7) 100%);
}

.hero-content {
    position: relative;
    z-index: 10;
    text-align: center;
    max-width: 900px;
    padding: 0 var(--spacing-lg);
}

.hero-title {
    font-size: clamp(2.5rem, 8vw, 5rem);
    font-weight: 700;
    margin-bottom: var(--spacing-lg);
    letter-spacing: -0.03em;
    animation: fadeInUp 1s ease;
}

.hero-subtitle {
    font-size: clamp(1rem, 2.5vw, 1.5rem);
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-xl);
    animation: fadeInUp 1s ease 0.2s backwards;
}

.scroll-indicator {
    position: absolute;
    bottom: var(--spacing-xl);
    left: 50%;
    transform: translateX(-50%);
    width: 24px;
    height: 40px;
    border: 2px solid var(--color-text-secondary);
    border-radius: 12px;
    z-index: 10;
}

.scroll-indicator span {
    position: absolute;
    top: 8px;
    left: 50%;
    transform: translateX(-50%);
    width: 4px;
    height: 8px;
    background: var(--color-text-secondary);
    border-radius: 2px;
    animation: scrollDown 2s infinite;
}

/* === Page Hero (for other pages) === */
.page-hero {
    position: relative;
    height: 50vh;
    min-height: 400px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-top: var(--nav-height);
}

.page-title {
    font-size: clamp(2rem, 6vw, 4rem);
    margin-bottom: var(--spacing-md);
}

.page-subtitle {
    font-size: clamp(1rem, 2vw, 1.25rem);
    color: var(--color-text-secondary);
}

/* === Buttons === */
.btn-primary {
    display: inline-block;
    padding: 1rem 2.5rem;
    font-size: var(--font-size-base);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--color-text-primary);
    background: var(--color-accent);
    border: 2px solid var(--color-accent);
    border-radius: 0;
    transition: all var(--transition-base);
    animation: fadeInUp 1s ease 0.4s backwards;
}

.btn-primary:hover {
    background: var(--color-accent-hover);
    border-color: var(--color-accent-hover);
    transform: translateY(-2px);
}

/* === Capabilities Section === */
.capabilities {
    padding: var(--spacing-3xl) 0;
    background: var(--color-surface);
}

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

.capability-card {
    padding: var(--spacing-xl);
    background: var(--color-surface-elevated);
    border: 1px solid var(--color-border);
    transition: transform var(--transition-base), border-color var(--transition-base);
    cursor: pointer;
}

.capability-card:hover {
    transform: translateY(-4px);
    border-color: var(--color-accent);
}

.capability-card[data-expandable] .capability-detail {
    max-height: 0;
    overflow: hidden;
    opacity: 0;
    transition: max-height 0.4s ease, opacity 0.4s ease, margin-top 0.4s ease;
}

.capability-card[data-expandable].expanded .capability-detail {
    max-height: 500px;
    opacity: 1;
    margin-top: var(--spacing-md);
}

.capability-card[data-expandable] .capability-summary {
    transition: opacity 0.3s ease;
}

.capability-card[data-expandable].expanded .capability-summary {
    opacity: 0;
    max-height: 0;
    overflow: hidden;
    margin: 0;
}

.capability-icon {
    width: 64px;
    height: 64px;
    margin-bottom: var(--spacing-lg);
    color: var(--color-accent);
}

.capability-icon svg {
    width: 100%;
    height: 100%;
}

.capability-card h3 {
    font-size: var(--font-size-xl);
    margin-bottom: var(--spacing-sm);
}

.capability-card p {
    color: var(--color-text-secondary);
    line-height: 1.8;
}

/* === Stats Section === */
.stats {
    padding: var(--spacing-3xl) 0;
    background: var(--color-background);
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-xl);
    text-align: center;
}

.stat-number {
    font-size: var(--font-size-4xl);
    font-weight: 700;
    color: var(--color-accent);
    margin-bottom: var(--spacing-sm);
}

.stat-label {
    font-size: var(--font-size-lg);
    color: var(--color-text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.1em;
}

/* === CTA Section === */
.cta {
    padding: var(--spacing-3xl) 0;
    background: var(--color-surface);
    text-align: center;
}

.cta h2 {
    margin-bottom: var(--spacing-md);
}

.cta p {
    font-size: var(--font-size-lg);
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-xl);
}

/* === Content Sections === */
.vision,
.core-capabilities,
.differentiators,
.products-section,
.services-section {
    padding: var(--spacing-3xl) 0;
}

.vision {
    background: var(--color-background);
}

.core-capabilities {
    background: var(--color-surface);
}

.differentiators {
    background: var(--color-background);
}

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

.content-block {
    max-width: 800px;
    margin: 0 auto;
}

.large-text {
    font-size: var(--font-size-xl);
    line-height: 1.6;
    color: var(--color-text-secondary);
}

/* === Capabilities List === */
.capabilities-list {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-xl);
}

.capability-item {
    padding: var(--spacing-lg);
    border-left: 2px solid var(--color-accent);
}

.capability-item h3 {
    margin-bottom: var(--spacing-sm);
}

.capability-item p {
    color: var(--color-text-secondary);
}

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

.diff-card {
    padding: var(--spacing-xl);
    background: var(--color-surface-elevated);
    border: 1px solid var(--color-border);
    text-align: center;
}

.diff-card h3 {
    margin-bottom: var(--spacing-md);
}

.diff-card p {
    color: var(--color-text-secondary);
}

/* === Products === */
.products-section {
    background: var(--color-background);
}

.product-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: var(--spacing-2xl);
}

.product-card {
    background: var(--color-surface-elevated);
    border: 1px solid var(--color-border);
    overflow: hidden;
    transition: transform var(--transition-base), border-color var(--transition-base);
}

.product-card:hover {
    transform: translateY(-8px);
    border-color: var(--color-accent);
}

.product-image {
    aspect-ratio: 16/9;
    background: linear-gradient(135deg, #001d3d 0%, #000814 100%);
    display: flex;
    align-items: center;
    justify-content: center;
}

.product-placeholder {
    font-size: var(--font-size-2xl);
    font-weight: 700;
    letter-spacing: 0.1em;
    color: var(--color-accent);
}

.product-info {
    padding: var(--spacing-xl);
}

.product-category {
    font-size: var(--font-size-sm);
    color: var(--color-accent);
    text-transform: uppercase;
    letter-spacing: 0.1em;
    margin-bottom: var(--spacing-sm);
}

.product-price {
    font-size: var(--font-size-2xl);
    font-weight: 700;
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-md);
}

.product-info h3 {
    margin-bottom: var(--spacing-md);
}

.product-info > p {
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-lg);
}

.product-specs {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
    padding-top: var(--spacing-lg);
    border-top: 1px solid var(--color-border);
}

.product-specs li {
    font-size: var(--font-size-sm);
    color: var(--color-text-tertiary);
}

/* === AI Operations === */
.ai-operations-section {
    padding: var(--spacing-3xl) 0;
    background: var(--color-surface);
}

.ai-operations-content {
    max-width: 1000px;
    margin: 0 auto;
}

.ai-operations-text h3 {
    font-size: var(--font-size-2xl);
    margin-bottom: var(--spacing-lg);
    text-align: center;
}

.ai-operations-text .large-text {
    text-align: center;
    margin-bottom: var(--spacing-2xl);
}

.ai-features {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-xl);
    margin-top: var(--spacing-2xl);
}

.ai-feature-item {
    padding: var(--spacing-lg);
    background: var(--color-surface-elevated);
    border: 1px solid var(--color-border);
    border-left: 3px solid var(--color-accent);
    transition: transform var(--transition-base), border-color var(--transition-base);
}

.ai-feature-item:hover {
    transform: translateX(4px);
    border-left-color: var(--color-accent-hover);
}

.ai-feature-item h4 {
    font-size: var(--font-size-lg);
    margin-bottom: var(--spacing-sm);
    color: var(--color-text-primary);
}

.ai-feature-item p {
    color: var(--color-text-secondary);
    line-height: 1.8;
}

/* === Software Section === */
.software-section {
    padding: var(--spacing-3xl) 0;
    background: var(--color-background);
}

/* === Coming Soon === */
.coming-soon-section {
    margin-top: var(--spacing-3xl);
    padding: var(--spacing-2xl);
    text-align: center;
    background: var(--color-surface-elevated);
    border: 1px solid var(--color-border);
}

.coming-soon-text {
    font-size: var(--font-size-lg);
    color: var(--color-text-secondary);
    max-width: 600px;
    margin: 0 auto;
}

/* === Services === */
.services-section {
    background: var(--color-surface);
}

.services-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-lg);
}

.service-card {
    padding: var(--spacing-lg);
    background: var(--color-surface-elevated);
    border: 1px solid var(--color-border);
    transition: border-color var(--transition-base);
}

.service-card:hover {
    border-color: var(--color-accent);
}

.service-card h3 {
    margin-bottom: var(--spacing-sm);
    font-size: var(--font-size-lg);
}

.service-card p {
    color: var(--color-text-secondary);
    font-size: var(--font-size-sm);
}

/* === Contact === */
.contact-section {
    padding: var(--spacing-3xl) 0;
    background: var(--color-background);
}

.contact-form-wrapper {
    max-width: 800px;
    margin: 0 auto;
}

.contact-form-container h2 {
    margin-bottom: var(--spacing-md);
    text-align: center;
}

.contact-email {
    text-align: center;
    font-size: var(--font-size-lg);
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-2xl);
}

/* Email button wrapper - centers the button */
.contact-email-box {
    display: flex;
    justify-content: center;
    margin-top: var(--spacing-xl);
}

/* Description text above email button */
.contact-description {
    text-align: center;
    font-size: var(--font-size-lg);
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-lg);
}

.contact-email a {
    color: var(--color-accent);
    transition: color var(--transition-fast);
}

.contact-email a:hover {
    color: var(--color-accent-hover);
}

.contact-grid {
    display: grid;
    grid-template-columns: 1.5fr 1fr;
    gap: var(--spacing-3xl);
}

.contact-form {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.form-group label {
    font-size: var(--font-size-sm);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--color-text-secondary);
}

.form-group input,
.form-group select,
.form-group textarea {
    padding: var(--spacing-sm);
    font-family: inherit;
    font-size: var(--font-size-base);
    color: var(--color-text-primary);
    background: var(--color-surface-elevated);
    border: 1px solid var(--color-border);
    border-radius: 0;
    transition: border-color var(--transition-fast);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--color-accent);
}

.contact-info {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-2xl);
}

.info-block h3 {
    font-size: var(--font-size-lg);
    margin-bottom: var(--spacing-md);
}

.info-block p {
    color: var(--color-text-secondary);
    line-height: 1.8;
}

.info-block a {
    color: var(--color-accent);
    transition: color var(--transition-fast);
}

.info-block a:hover {
    color: var(--color-accent-hover);
}

/* === Legal Pages === */
.legal-page {
    padding: calc(var(--nav-height) + var(--spacing-3xl)) var(--spacing-lg) var(--spacing-3xl);
    background: var(--color-background);
    min-height: 100vh;
}

.legal-content {
    max-width: 900px;
    margin: 0 auto;
}

.legal-content h1 {
    font-size: var(--font-size-3xl);
    margin-bottom: var(--spacing-md);
}

.last-updated {
    color: var(--color-text-tertiary);
    font-size: var(--font-size-sm);
    margin-bottom: var(--spacing-2xl);
}

.legal-content h2 {
    font-size: var(--font-size-xl);
    margin-top: var(--spacing-2xl);
    margin-bottom: var(--spacing-md);
    color: var(--color-text-primary);
}

.legal-content p {
    color: var(--color-text-secondary);
    line-height: 1.8;
    margin-bottom: var(--spacing-md);
}

.legal-content ul {
    list-style: disc;
    margin-left: var(--spacing-xl);
    margin-bottom: var(--spacing-md);
}

.legal-content ul li {
    color: var(--color-text-secondary);
    line-height: 1.8;
    margin-bottom: var(--spacing-xs);
}

.legal-content a {
    color: var(--color-accent);
    transition: color var(--transition-fast);
}

.legal-content a:hover {
    color: var(--color-accent-hover);
}

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

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-2xl);
    margin-bottom: var(--spacing-xl);
}

.footer-section h4 {
    font-size: var(--font-size-base);
    margin-bottom: var(--spacing-md);
}

.footer-section p,
.footer-section a {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
}

.footer-section ul {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.footer-section a:hover {
    color: var(--color-text-primary);
}

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

.footer-bottom p {
    font-size: var(--font-size-sm);
    color: var(--color-text-tertiary);
}

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

@keyframes scrollDown {
    0%, 20% {
        transform: translateX(-50%) translateY(0);
        opacity: 0;
    }
    50% {
        opacity: 1;
    }
    100% {
        transform: translateX(-50%) translateY(16px);
        opacity: 0;
    }
}

/* === Responsive Design === */
@media (max-width: 1024px) {
    :root {
        --spacing-3xl: 4rem;
        --spacing-2xl: 3rem;
    }

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

@media (max-width: 768px) {
    .nav-menu {
        position: fixed;
        top: var(--nav-height);
        left: 0;
        right: 0;
        flex-direction: column;
        background: rgba(0, 0, 0, 0.95);
        backdrop-filter: blur(10px);
        padding: var(--spacing-lg);
        gap: var(--spacing-lg);
        transform: translateX(-100%);
        transition: transform var(--transition-base);
    }

    .nav-menu.active {
        transform: translateX(0);
    }

    .nav-toggle {
        display: flex;
    }

    .capabilities-grid,
    .product-grid {
        grid-template-columns: 1fr;
    }

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

@media (max-width: 480px) {
    :root {
        --nav-height: 60px;
        --spacing-lg: 1rem;
    }

    .container {
        padding: 0 var(--spacing-sm);
    }
}