/* ==========================================================================
   Protocogni Labs — Website Styles
   ========================================================================== */

:root {
    /* Colors — Deep, technical, precise */
    --color-bg: #0a0a0b;
    --color-bg-elevated: #111113;
    --color-bg-card: #161618;
    --color-border: #252528;
    --color-border-subtle: #1c1c1f;
    
    --color-text: #e8e8ec;
    --color-text-secondary: #9898a0;
    --color-text-muted: #5c5c66;
    
    --color-accent: #6366f1;
    --color-accent-dim: #4f46e5;
    --color-accent-glow: rgba(99, 102, 241, 0.15);
    
    /* Typography */
    --font-serif: 'Source Serif 4', Georgia, serif;
    --font-mono: 'JetBrains Mono', 'SF Mono', monospace;
    
    /* Spacing */
    --space-xs: 0.5rem;
    --space-sm: 1rem;
    --space-md: 1.5rem;
    --space-lg: 2.5rem;
    --space-xl: 4rem;
    --space-2xl: 6rem;
    --space-3xl: 8rem;
    
    /* Layout */
    --max-width: 1100px;
    --content-width: 680px;
}

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

html {
    font-size: 16px;
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
}

body {
    font-family: var(--font-serif);
    font-size: 1.0625rem;
    line-height: 1.7;
    color: var(--color-text);
    background-color: var(--color-bg);
}

::selection {
    background-color: var(--color-accent);
    color: white;
}

/* --------------------------------------------------------------------------
   Typography
   -------------------------------------------------------------------------- */
h1, h2, h3 {
    font-family: var(--font-serif);
    font-weight: 500;
    line-height: 1.2;
    letter-spacing: -0.02em;
}

h1 {
    font-size: clamp(2.5rem, 6vw, 4rem);
    font-weight: 600;
}

h2 {
    font-size: clamp(1.5rem, 3vw, 2rem);
}

h3 {
    font-size: 1.125rem;
    font-weight: 500;
}

p {
    margin-bottom: 1em;
}

p:last-child {
    margin-bottom: 0;
}

a {
    color: var(--color-accent);
    text-decoration: none;
    transition: color 0.15s ease;
}

a:hover {
    color: var(--color-text);
}

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

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

/* --------------------------------------------------------------------------
   Navigation
   -------------------------------------------------------------------------- */
.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    background-color: rgba(10, 10, 11, 0.8);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--color-border-subtle);
}

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

.nav-logo {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-family: var(--font-mono);
    font-size: 0.8125rem;
    font-weight: 500;
    color: var(--color-text);
    letter-spacing: 0.02em;
}

.nav-logo-icon {
    width: 24px;
    height: 24px;
}

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

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

.nav-links a {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--color-text-secondary);
    letter-spacing: 0.02em;
    transition: color 0.15s ease;
}

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

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

.hero-container {
    text-align: center;
    padding: var(--space-3xl) var(--space-lg);
    position: relative;
    z-index: 1;
}

.hero-content {
    animation: fadeIn 0.8s ease-out;
}

.hero-label {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--color-accent);
    letter-spacing: 0.15em;
    text-transform: uppercase;
    margin-bottom: var(--space-md);
}

.hero-title {
    color: var(--color-text);
    margin-bottom: var(--space-md);
}

.hero-tagline {
    font-family: var(--font-mono);
    font-size: clamp(0.875rem, 1.5vw, 1rem);
    color: var(--color-text-secondary);
    letter-spacing: 0.02em;
    max-width: 500px;
    margin: 0 auto;
}

.hero-gradient {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: 
        radial-gradient(ellipse 80% 50% at 50% -20%, var(--color-accent-glow), transparent),
        radial-gradient(ellipse 60% 40% at 80% 60%, rgba(99, 102, 241, 0.05), transparent);
    pointer-events: none;
}

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

/* --------------------------------------------------------------------------
   About Section
   -------------------------------------------------------------------------- */
.section-about {
    background-color: var(--color-bg);
    border-top: 1px solid var(--color-border-subtle);
}

.about-grid {
    display: grid;
    grid-template-columns: 1fr 280px;
    gap: var(--space-2xl);
    align-items: start;
}

@media (max-width: 900px) {
    .about-grid {
        grid-template-columns: 1fr;
        gap: var(--space-xl);
    }
}

.about-main h2 {
    margin-bottom: var(--space-md);
    color: var(--color-text);
}

.about-lead {
    font-size: 1.1875rem;
    color: var(--color-text);
    margin-bottom: var(--space-md);
}

.about-main p:not(.about-lead) {
    color: var(--color-text-secondary);
}

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

.aside-block {
    padding: var(--space-md);
    background-color: var(--color-bg-elevated);
    border: 1px solid var(--color-border);
    border-radius: 6px;
}

.aside-label {
    font-family: var(--font-mono);
    font-size: 0.6875rem;
    color: var(--color-text-muted);
    letter-spacing: 0.1em;
    text-transform: uppercase;
    display: block;
    margin-bottom: var(--space-xs);
}

.aside-block p {
    font-size: 0.9375rem;
    color: var(--color-text);
    line-height: 1.5;
}

/* --------------------------------------------------------------------------
   Research Section
   -------------------------------------------------------------------------- */
.section-research {
    background-color: var(--color-bg-elevated);
    border-top: 1px solid var(--color-border-subtle);
}

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

.section-header h2 {
    margin-bottom: var(--space-xs);
}

.section-header p {
    font-family: var(--font-mono);
    font-size: 0.875rem;
    color: var(--color-text-muted);
}

.research-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-md);
}

@media (max-width: 900px) {
    .research-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 600px) {
    .research-grid {
        grid-template-columns: 1fr;
    }
}

.research-card {
    padding: var(--space-lg);
    background-color: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: 8px;
    transition: border-color 0.2s ease, transform 0.2s ease;
}

.research-card:hover {
    border-color: var(--color-accent-dim);
    transform: translateY(-2px);
}

.card-number {
    font-family: var(--font-mono);
    font-size: 0.6875rem;
    color: var(--color-accent);
    letter-spacing: 0.05em;
    margin-bottom: var(--space-sm);
}

.research-card h3 {
    color: var(--color-text);
    margin-bottom: var(--space-sm);
}

.research-card p {
    font-size: 0.9375rem;
    color: var(--color-text-secondary);
    line-height: 1.6;
}

/* --------------------------------------------------------------------------
   Contact Section
   -------------------------------------------------------------------------- */
.section-contact {
    background-color: var(--color-bg);
    border-top: 1px solid var(--color-border-subtle);
}

.contact-grid {
    max-width: var(--content-width);
}

.contact-main h2 {
    margin-bottom: var(--space-sm);
}

.contact-main p {
    color: var(--color-text-secondary);
    margin-bottom: var(--space-md);
}

.contact-email {
    font-family: var(--font-mono);
    font-size: 1.125rem;
    color: var(--color-accent);
    border-bottom: 1px solid var(--color-border);
    padding-bottom: 2px;
    transition: border-color 0.15s ease;
}

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

/* --------------------------------------------------------------------------
   Footer
   -------------------------------------------------------------------------- */
.footer {
    background-color: var(--color-bg);
    border-top: 1px solid var(--color-border-subtle);
    padding: var(--space-lg) 0;
}

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

.footer-name,
.footer-year {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--color-text-muted);
}

/* --------------------------------------------------------------------------
   Responsive
   -------------------------------------------------------------------------- */
@media (max-width: 600px) {
    :root {
        --space-lg: 1.5rem;
        --space-xl: 2.5rem;
        --space-2xl: 4rem;
        --space-3xl: 5rem;
    }
    
    .section {
        padding: var(--space-2xl) 0;
    }
    
    .nav-links {
        gap: var(--space-md);
    }
    
    .footer-content {
        flex-direction: column;
        gap: var(--space-xs);
    }
}