/* ============================================
   StrataForge Design System
   ============================================ */

/* CSS Custom Properties */
:root {
    /* Colors */
    --bg-primary: #050608;
    --bg-secondary: #0C0E11;
    --accent-cyan: #31C3D9;
    --accent-green: #9EF77A;
    --text-primary: #F2F3F4;
    --text-secondary: #9CA2A9;
    --divider: #1A1D21;

    /* Typography */
    --font-primary: 'Space Grotesk', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-mono: 'IBM Plex Mono', monospace;

    /* Spacing */
    --space-xs: 0.5rem;
    --space-sm: 1rem;
    --space-md: 1.5rem;
    --space-lg: 2rem;
    --space-xl: 3rem;
    --space-2xl: 5rem;
    --space-3xl: 8rem;

    /* Layout */
    --container-max: 1200px;
    --header-height: 80px;

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 250ms ease;
    --transition-slow: 400ms 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-primary);
    font-size: 16px;
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--bg-primary);
    overflow-x: hidden;
}

a {
    color: inherit;
    text-decoration: none;
}

ul, ol {
    list-style: none;
}

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

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

/* ============================================
   Layout
   ============================================ */
.container {
    width: 100%;
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--space-lg);
}

.section {
    padding: var(--space-3xl) 0;
}

.section-alt {
    background-color: var(--bg-secondary);
}

.section-title {
    font-size: clamp(1.75rem, 4vw, 2.5rem);
    font-weight: 600;
    letter-spacing: 0.02em;
    margin-bottom: var(--space-xl);
    color: var(--text-primary);
}

/* ============================================
   Header
   ============================================ */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--header-height);
    z-index: 1000;
    background-color: rgba(5, 6, 8, 0.8);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid transparent;
    transition: background-color var(--transition-base), border-color var(--transition-base);
}

.header.scrolled {
    background-color: rgba(5, 6, 8, 0.95);
    border-bottom-color: var(--divider);
}

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

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

.logo img {
    height: 32px;
    width: auto;
}

.nav {
    display: flex;
    gap: var(--space-lg);
}

.nav-link {
    font-size: 0.875rem;
    font-weight: 500;
    letter-spacing: 0.05em;
    color: var(--text-secondary);
    transition: color var(--transition-fast);
    position: relative;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 1px;
    background-color: var(--accent-cyan);
    transition: width var(--transition-base);
}

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

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

/* Hamburger Menu */
.hamburger {
    display: none;
    flex-direction: column;
    gap: 5px;
    padding: 10px;
    margin-right: -10px;
}

.hamburger span {
    display: block;
    width: 24px;
    height: 2px;
    background-color: var(--text-primary);
    transition: transform var(--transition-base), opacity var(--transition-base);
}

.hamburger.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

.hamburger.active span:nth-child(2) {
    opacity: 0;
}

.hamburger.active span:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
}

/* Mobile Menu */
.mobile-menu {
    display: none;
    position: fixed;
    top: var(--header-height);
    left: 0;
    right: 0;
    background-color: var(--bg-primary);
    border-bottom: 1px solid var(--divider);
    padding: var(--space-md);
    z-index: 999;
    opacity: 0;
    transform: translateY(-10px);
    pointer-events: none;
    transition: opacity var(--transition-base), transform var(--transition-base);
}

.mobile-menu.active {
    opacity: 1;
    transform: translateY(0);
    pointer-events: auto;
}

.mobile-nav-link {
    display: block;
    padding: var(--space-sm) 0;
    font-size: 1rem;
    color: var(--text-secondary);
    border-bottom: 1px solid var(--divider);
    transition: color var(--transition-fast);
}

.mobile-nav-link:last-child {
    border-bottom: none;
}

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

/* ============================================
   Hero Section
   ============================================ */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: calc(var(--header-height) + var(--space-xl)) var(--space-lg) var(--space-xl);
    overflow: hidden;
}

.hero-texture {
    position: absolute;
    inset: 0;
    background-image: url('assets/basalt-texture.svg');
    background-size: cover;
    background-position: center;
    opacity: 0.12;
    pointer-events: none;
}

.hero-grid {
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(rgba(58, 229, 255, 0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(58, 229, 255, 0.03) 1px, transparent 1px);
    background-size: 60px 60px;
    pointer-events: none;
}

.hero-content {
    position: relative;
    max-width: 800px;
    text-align: center;
    z-index: 1;
}

.hero-label {
    display: inline-block;
    font-family: var(--font-mono);
    font-size: 0.75rem;
    font-weight: 500;
    letter-spacing: 0.2em;
    color: var(--accent-cyan);
    margin-bottom: var(--space-md);
    padding: var(--space-xs) var(--space-sm);
    border: 1px solid rgba(58, 229, 255, 0.3);
    background-color: rgba(58, 229, 255, 0.05);
}

.hero-logo {
    max-width: clamp(300px, 50vw, 500px);
    height: auto;
    margin-bottom: var(--space-lg);
}

.hero-title {
    font-size: clamp(3rem, 10vw, 6rem);
    font-weight: 700;
    letter-spacing: 0.08em;
    line-height: 1.1;
    margin-bottom: var(--space-md);
    background: linear-gradient(180deg, var(--text-primary) 0%, rgba(242, 243, 244, 0.7) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-tagline {
    font-size: clamp(1.125rem, 2.5vw, 1.5rem);
    font-weight: 400;
    color: var(--text-secondary);
    margin-bottom: var(--space-lg);
}

.hero-body {
    font-size: 1rem;
    line-height: 1.8;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto var(--space-xl);
}

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

/* ============================================
   Buttons
   ============================================ */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-sm) var(--space-lg);
    font-family: var(--font-primary);
    font-size: 0.875rem;
    font-weight: 500;
    letter-spacing: 0.05em;
    border-radius: 2px;
    transition: all var(--transition-fast);
}

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

.btn-primary:hover {
    background-color: #3DD4E8;
    transform: translateY(-1px);
}

.btn-secondary {
    background-color: transparent;
    color: var(--text-primary);
    border: 1px solid var(--divider);
}

.btn-secondary:hover {
    border-color: var(--text-secondary);
    background-color: rgba(255, 255, 255, 0.02);
}

/* ============================================
   About Section
   ============================================ */
.about-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-2xl);
    align-items: start;
}

.about-text p {
    font-size: 1.125rem;
    line-height: 1.8;
    color: var(--text-secondary);
    margin-bottom: var(--space-md);
}

.about-text p:last-child {
    margin-bottom: 0;
}

.definition-list {
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
}

.definition-item {
    padding: var(--space-md);
    border: 1px solid var(--divider);
    background-color: rgba(12, 14, 17, 0.5);
}

.definition-item dt {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    font-weight: 500;
    letter-spacing: 0.1em;
    color: var(--accent-cyan);
    text-transform: uppercase;
    margin-bottom: var(--space-xs);
}

.definition-item dd {
    font-size: 1rem;
    color: var(--text-primary);
}

/* ============================================
   Cards
   ============================================ */
.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: var(--space-md);
}

.card-grid-3 {
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
}

.card {
    padding: var(--space-lg);
    border: 1px solid var(--divider);
    background-color: rgba(5, 6, 8, 0.6);
    transition: transform var(--transition-fast), border-color var(--transition-fast);
}

.card:hover {
    transform: scale(1.01);
    border-color: rgba(58, 229, 255, 0.2);
}

.card-title {
    font-size: 1.125rem;
    font-weight: 600;
    letter-spacing: 0.02em;
    margin-bottom: var(--space-sm);
    color: var(--text-primary);
}

.card-description {
    font-size: 0.9375rem;
    line-height: 1.6;
    color: var(--text-secondary);
    margin-bottom: var(--space-md);
}

.card-status {
    display: inline-block;
    font-family: var(--font-mono);
    font-size: 0.6875rem;
    font-weight: 500;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    padding: 4px 10px;
    border-radius: 2px;
}

.status-active {
    background-color: rgba(158, 247, 122, 0.1);
    color: var(--accent-green);
    border: 1px solid rgba(158, 247, 122, 0.3);
}

.status-paused {
    background-color: rgba(156, 162, 169, 0.1);
    color: var(--text-secondary);
    border: 1px solid rgba(156, 162, 169, 0.3);
}

.status-archived {
    background-color: rgba(156, 162, 169, 0.05);
    color: rgba(156, 162, 169, 0.6);
    border: 1px solid rgba(156, 162, 169, 0.15);
}

/* Prototype Cards */
.card-prototype {
    background-color: rgba(12, 14, 17, 0.8);
}

.card-tags {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-xs);
}

.tag {
    font-family: var(--font-mono);
    font-size: 0.625rem;
    font-weight: 500;
    letter-spacing: 0.05em;
    text-transform: uppercase;
    padding: 4px 8px;
    background-color: rgba(58, 229, 255, 0.08);
    color: var(--accent-cyan);
    border: 1px solid rgba(58, 229, 255, 0.2);
}

/* ============================================
   Background Section
   ============================================ */
.background-content {
    max-width: 700px;
    margin: 0 auto;
}

.background-text p {
    font-size: 1.125rem;
    line-height: 1.9;
    color: var(--text-secondary);
    margin-bottom: var(--space-lg);
}

.principles {
    margin: var(--space-xl) 0;
    padding: var(--space-lg);
    border-left: 2px solid var(--accent-cyan);
    background-color: rgba(58, 229, 255, 0.02);
}

.principles-title {
    font-size: 0.875rem;
    font-weight: 600;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--text-primary);
    margin-bottom: var(--space-md);
}

.principles-list {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-sm);
}

.principles-list li {
    font-size: 1rem;
    color: var(--text-secondary);
    padding-left: var(--space-md);
    position: relative;
}

.principles-list li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0.6em;
    width: 4px;
    height: 4px;
    background-color: var(--accent-cyan);
}

.signature {
    font-size: 1rem;
    color: var(--text-secondary);
    padding-top: var(--space-lg);
    border-top: 1px solid var(--divider);
    font-style: italic;
}

/* ============================================
   Status Section
   ============================================ */
.status-content {
    max-width: 600px;
    margin: 0 auto;
    text-align: center;
}

.status-text {
    font-size: 1.125rem;
    line-height: 1.8;
    color: var(--text-secondary);
    margin-bottom: var(--space-md);
}

.status-content .btn {
    margin-top: var(--space-lg);
}

/* ============================================
   Footer
   ============================================ */
.footer {
    padding: var(--space-xl) 0;
    border-top: 1px solid var(--divider);
    text-align: center;
}

.footer p {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.footer-link {
    color: var(--text-secondary);
    transition: color var(--transition-fast);
}

.footer-link:hover {
    color: var(--accent-cyan);
}

.footer-note {
    margin-top: var(--space-xs);
    font-size: 0.8125rem;
    color: rgba(156, 162, 169, 0.6);
}

/* ============================================
   Animations
   ============================================ */
.fade-in {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity var(--transition-slow), transform var(--transition-slow);
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

/* Stagger effect for cards */
.card-grid .card:nth-child(1) { transition-delay: 0ms; }
.card-grid .card:nth-child(2) { transition-delay: 50ms; }
.card-grid .card:nth-child(3) { transition-delay: 100ms; }
.card-grid .card:nth-child(4) { transition-delay: 150ms; }
.card-grid .card:nth-child(5) { transition-delay: 200ms; }
.card-grid .card:nth-child(6) { transition-delay: 250ms; }

/* ============================================
   Responsive Design
   ============================================ */
@media (max-width: 768px) {
    :root {
        --space-3xl: 5rem;
        --header-height: 60px;
    }

    .hero {
        min-height: auto;
        padding-top: calc(var(--header-height) + var(--space-md));
        padding-bottom: var(--space-xl);
    }

    .nav {
        display: none;
    }

    .hamburger {
        display: flex;
    }

    .mobile-menu {
        display: block;
    }

    .about-grid {
        grid-template-columns: 1fr;
        gap: var(--space-xl);
    }

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

    .principles-list {
        grid-template-columns: 1fr;
    }

    .hero-buttons {
        flex-direction: column;
        align-items: center;
    }

    .btn {
        width: 100%;
        max-width: 280px;
    }
}

@media (max-width: 480px) {
    :root {
        --space-lg: 1.5rem;
        --space-xl: 2rem;
        --space-2xl: 3rem;
        --space-3xl: 4rem;
    }

    .container {
        padding: 0 var(--space-md);
    }

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

/* ============================================
   Privacy Page
   ============================================ */
.privacy-page {
    padding: var(--space-3xl) var(--space-lg);
    max-width: 800px;
    margin: 0 auto;
}

.privacy-page .back-link {
    display: inline-block;
    font-size: 0.875rem;
    color: var(--accent-cyan);
    margin-bottom: var(--space-lg);
    transition: opacity var(--transition-fast);
}

.privacy-page .back-link:hover {
    opacity: 0.8;
}

.privacy-page h1 {
    font-size: clamp(2rem, 5vw, 3rem);
    font-weight: 600;
    margin-bottom: var(--space-sm);
}

.privacy-page .last-updated {
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin-bottom: var(--space-2xl);
}

.privacy-page section {
    margin-bottom: var(--space-xl);
}

.privacy-page h2 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: var(--space-sm);
    color: var(--text-primary);
}

.privacy-page h3 {
    font-size: 1rem;
    font-weight: 500;
    margin-bottom: var(--space-xs);
    color: var(--text-primary);
}

.privacy-page p {
    font-size: 1rem;
    line-height: 1.8;
    color: var(--text-secondary);
    margin-bottom: var(--space-sm);
}

.privacy-page ul {
    list-style: disc;
    margin-left: var(--space-lg);
    margin-bottom: var(--space-sm);
}

.privacy-page li {
    font-size: 1rem;
    line-height: 1.8;
    color: var(--text-secondary);
    margin-bottom: var(--space-xs);
}

.privacy-page a {
    color: var(--accent-cyan);
    transition: opacity var(--transition-fast);
}

.privacy-page a:hover {
    opacity: 0.8;
}

/* ============================================
   Print Styles
   ============================================ */
@media print {
    .header,
    .mobile-menu,
    .hero-buttons,
    .footer {
        display: none;
    }

    .hero {
        min-height: auto;
        padding: var(--space-lg);
    }

    .section {
        padding: var(--space-lg) 0;
    }

    body {
        background: white;
        color: black;
    }
}