/* ============================================================================
   AETHVION - PREMIUM ENTERPRISE DESIGN SYSTEM
   Strictly Dark Mode, Clean Corporate Aesthetic
   ============================================================================ */

:root {
    /* Color Palette - Premium Dark SaaS */
    --bg-base: #050505;
    --bg-surface: #0A0A0A;
    --bg-surface-elevated: #141414;
    --bg-surface-hover: #1A1A1A;
    
    --border-subtle: #222222;
    --border-strong: #333333;
    
    --text-primary: #EDEDED;
    --text-secondary: #A0A0A0;
    --text-tertiary: #707070;
    
    --accent-primary: #0055FF;
    --accent-hover: #3B82F6;
    --accent-muted: rgba(0, 85, 255, 0.15);

    /* Spacing Scale */
    --space-xs: 0.25rem;
    --space-sm: 0.5rem;
    --space-md: 1rem;
    --space-lg: 1.5rem;
    --space-xl: 2.5rem;
    --space-2xl: 4rem;
    --space-3xl: 6rem;
    
    /* Typography */
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    
    /* Radii */
    --radius-sm: 4px;
    --radius-md: 6px;
    --radius-lg: 8px;
    --radius-xl: 12px;
    
    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 250ms ease;
}

/* RESET & BASE */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    background-color: var(--bg-base);
    color: var(--text-primary);
    font-family: var(--font-sans);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    scroll-behavior: smooth;
}

body {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

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

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

h1, h2, h3, h4 {
    color: #FFFFFF;
    font-weight: 600;
    line-height: 1.2;
    letter-spacing: -0.02em;
}

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

/* LAYOUT UTILITIES */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--space-xl);
    width: 100%;
}

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

.grid {
    display: grid;
    gap: var(--space-xl);
}

.grid-2 {
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
}

.grid-3 {
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
}

/* NAVIGATION */
.navbar {
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(5, 5, 5, 0.8);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border-subtle);
    padding: var(--space-md) 0;
}

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

.logo {
    font-weight: 700;
    font-size: 1.125rem;
    letter-spacing: -0.02em;
    color: #FFFFFF;
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}

.logo-accent {
    color: var(--text-secondary);
    font-weight: 400;
}

.nav-links {
    display: flex;
    gap: var(--space-lg);
    list-style: none;
}

.nav-link {
    color: var(--text-secondary);
    font-size: 0.875rem;
    font-weight: 500;
}

.nav-link:hover, .nav-link.active {
    color: #FFFFFF;
}

/* HERO SECTION */
.hero {
    padding: var(--space-3xl) 0 var(--space-2xl);
    text-align: center;
    max-width: 800px;
    margin: 0 auto;
}

.hero h1 {
    font-size: clamp(2.5rem, 5vw, 4rem);
    margin-bottom: var(--space-lg);
    letter-spacing: -0.04em;
}

.hero .lead {
    font-size: 1.25rem;
    color: var(--text-secondary);
    margin-bottom: var(--space-xl);
}

/* CARDS / FEATURE PANELS */
.feature-card {
    background: var(--bg-surface);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-xl);
    padding: var(--space-xl);
    transition: all var(--transition-base);
    display: flex;
    flex-direction: column;
}

.feature-card:hover {
    border-color: var(--border-strong);
    background: var(--bg-surface-elevated);
    transform: translateY(-2px);
}

.eyebrow {
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    font-weight: 600;
    color: var(--text-tertiary);
    margin-bottom: var(--space-md);
}

.feature-card h2, .feature-card h3 {
    font-size: 1.5rem;
    margin-bottom: var(--space-md);
}

.feature-card p {
    margin-bottom: var(--space-xl);
    flex-grow: 1;
}

/* BUTTONS & CTA */
.btn-group {
    display: flex;
    gap: var(--space-md);
    flex-wrap: wrap;
    justify-content: center;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-sm) var(--space-lg);
    border-radius: var(--radius-md);
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-fast);
    border: 1px solid transparent;
}

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

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

.btn-secondary {
    background: var(--bg-surface-elevated);
    color: var(--text-primary);
    border-color: var(--border-subtle);
}

.btn-secondary:hover {
    background: var(--bg-surface-hover);
    border-color: var(--border-strong);
}

.feature-cta {
    color: var(--accent-primary);
    font-size: 0.875rem;
    font-weight: 500;
    display: inline-flex;
    align-items: center;
    margin-top: auto;
}

.feature-cta:hover {
    color: var(--accent-hover);
}

/* FOOTER */
.site-footer {
    border-top: 1px solid var(--border-subtle);
    padding: var(--space-3xl) 0 var(--space-lg);
    margin-top: auto;
    background: var(--bg-surface);
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    gap: var(--space-xl);
    margin-bottom: var(--space-2xl);
}

.footer-brand p {
    margin-top: var(--space-sm);
    max-width: 300px;
    font-size: 0.875rem;
}

.footer-column h3 {
    font-size: 0.875rem;
    color: #FFFFFF;
    margin-bottom: var(--space-md);
}

.footer-column ul {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
}

.footer-column a, .footer-column li {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.footer-column a:hover {
    color: #FFFFFF;
}

.footer-bottom {
    border-top: 1px solid var(--border-subtle);
    padding-top: var(--space-lg);
    display: flex;
    justify-content: space-between;
    font-size: 0.75rem;
    color: var(--text-tertiary);
}

/* SPECIFIC UTILS */
.text-center { text-align: center; }
.mt-xl { margin-top: var(--space-xl); }
.mb-xl { margin-bottom: var(--space-xl); }
.mono { font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace; font-size: 0.85em; padding: 2px 4px; background: var(--bg-surface-elevated); border-radius: 4px; color: var(--text-primary); }

/* SUB-PAGE COMPONENTS (Feature Lists, Status Badges, etc.) */
.horizontal-list {
    display: flex;
    flex-direction: column;
    gap: var(--space-xl);
    margin: var(--space-2xl) 0;
}

.horizontal-card-media img {
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-subtle);
    margin-bottom: var(--space-md);
}

.horizontal-card-header {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    margin-bottom: var(--space-sm);
}

.horizontal-card-category {
    font-size: 0.75rem;
    color: var(--accent-primary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    font-weight: 600;
}

.horizontal-card-tags {
    display: flex;
    gap: var(--space-sm);
    flex-wrap: wrap;
    margin-top: var(--space-md);
}

.horizontal-card-tag {
    font-size: 0.75rem;
    padding: 2px 8px;
    background: var(--bg-surface-elevated);
    border: 1px solid var(--border-subtle);
    border-radius: 4px;
    color: var(--text-secondary);
}

.ai-status {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    margin: var(--space-xl) 0;
    flex-wrap: wrap;
}

.status-badge {
    font-size: 0.75rem;
    font-weight: 600;
    padding: 4px 12px;
    border-radius: 12px;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    border: 1px solid var(--border-subtle);
    background: var(--bg-surface-elevated);
    color: var(--text-primary);
}

.status-badge.development {
    color: #22c55e;
    border-color: rgba(34, 197, 94, 0.3);
    background: rgba(34, 197, 94, 0.1);
}

.status-badge.github-link:hover {
    background: var(--bg-surface-hover);
    border-color: var(--border-strong);
}

.status-text {
    font-size: 0.875rem;
    color: var(--text-tertiary);
    margin: 0;
}

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

.project-content h2 {
    margin: var(--space-2xl) 0 var(--space-lg);
}

.project-content p {
    margin-bottom: var(--space-md);
}

/* Responsive Horizontal Cards */
@media (min-width: 768px) {
    .feature-card[data-href] {
        flex-direction: row;
        gap: var(--space-xl);
        align-items: center;
    }
    .horizontal-card-media {
        flex: 0 0 40%;
    }
    .horizontal-card-media img {
        margin-bottom: 0;
    }
}

/* MOBILE RESPONSIVENESS */
@media (max-width: 768px) {
    .nav-container {
        flex-direction: column;
        gap: var(--space-md);
        text-align: center;
    }
    .nav-links {
        flex-wrap: wrap;
        justify-content: center;
        gap: var(--space-sm);
    }
    .nav-link {
        white-space: nowrap;
    }
    .footer-grid {
        grid-template-columns: 1fr;
        text-align: center;
    }
    .footer-brand p {
        margin: var(--space-sm) auto 0;
    }
    .footer-column {
        align-items: center;
    }
    .footer-bottom {
        flex-direction: column;
        text-align: center;
        gap: var(--space-md);
    }
}