/* ==========================================================================
   Base Styles & Variables (Dark Cinematic Aesthetic)
   ========================================================================== */
:root {
    --bg-dark: #000000;
    --text-primary: #ffffff;
    --text-secondary: #a0a0a0;
    --text-muted: #666666;
    --border-color: #222222;
    --glass-bg: rgba(15, 15, 15, 0.7);
    --glass-border: rgba(255, 255, 255, 0.1);
    
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    --font-serif: 'Lora', Georgia, Cambria, "Times New Roman", Times, serif;
    
    --spacing-md: 2rem;
    --spacing-lg: 4rem;
    --spacing-xl: 8rem;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; font-size: 16px; }

body {
    font-family: var(--font-sans);
    background-color: var(--bg-dark);
    color: var(--text-primary);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

::selection { background: #ffffff; color: #000000; }

/* A11y Focus States */
a:focus-visible, button:focus-visible, input:focus-visible {
    outline: 2px solid #ffffff;
    outline-offset: 4px;
}
input:focus { outline: none; border-color: #ffffff; }

/* Scroll progress indicator */
.scroll-progress {
    position: fixed; top: 0; left: 0; height: 2px; width: 0;
    background: #ffffff; z-index: 200; transition: width 0.1s linear;
    will-change: width;
}

/* ==========================================================================
   Typography
   ========================================================================== */
.hero-title {
    font-family: var(--font-serif);
    font-size: clamp(3rem, 7vw, 6.5rem);
    line-height: 1.05;
    letter-spacing: -0.02em;
    color: var(--text-primary);
    margin-bottom: 2rem;
}

.section-heading {
    font-family: var(--font-serif);
    font-size: clamp(2rem, 4vw, 3.5rem);
    line-height: 1.2;
    letter-spacing: -0.02em;
    margin-bottom: 1.5rem;
}

.hero-lead {
    font-family: var(--font-sans);
    font-size: clamp(1.2rem, 2.5vw, 1.8rem);
    line-height: 1.4;
    color: #cccccc;
    font-weight: 300;
}

.paragraph-large { font-size: clamp(1.2rem, 2vw, 1.5rem); line-height: 1.5; margin-bottom: 1.5rem; color: var(--text-primary); }
.paragraph-medium { font-size: 1.1rem; line-height: 1.6; margin-bottom: 1.5rem; color: var(--text-secondary); font-weight: 300; }

.text-center { text-align: center; }
.mb-4 { margin-bottom: var(--spacing-lg); }
.mt-2 { margin-top: var(--spacing-md); }
.mt-4 { margin-top: var(--spacing-lg); }
.pt-2 { padding-top: var(--spacing-md); }

.eyebrow {
    font-family: var(--font-sans); font-size: 0.8rem; font-weight: 500;
    letter-spacing: 0.15em; text-transform: uppercase; color: var(--text-muted);
    display: block; margin-bottom: 1.5rem;
}

/* ==========================================================================
   Layout & Utilities
   ========================================================================== */
.container { max-width: 1400px; margin: 0 auto; padding: 0 5%; }
.section { padding: var(--spacing-xl) 0; }
.border-top { border-top: 1px solid var(--border-color); }
.border-bottom { border-bottom: 1px solid var(--border-color); }
.relative { position: relative; }
.z-10 { z-index: 10; }

.grid-2-col { display: grid; grid-template-columns: 4fr 6fr; gap: var(--spacing-lg); }
.grid-3-col { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--spacing-md); }
/* Equal-width, equal-height product cards (Ecosystem showcase) */
.feature-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 1.75rem; align-items: stretch; }
.gap-large { gap: var(--spacing-lg); }
.flex-between { display: flex; justify-content: space-between; align-items: center; }

/* ==========================================================================
   Navigation
   ========================================================================== */
.navbar {
    position: fixed; top: 0; width: 100%; padding: 1.5rem 0;
    background-color: transparent; z-index: 100; transition: all 0.4s ease;
}
.navbar.scrolled {
    background-color: rgba(0, 0, 0, 0.9);
    backdrop-filter: blur(20px); -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-color); padding: 1rem 0;
}
.nav-container {
    max-width: 1400px; margin: 0 auto; padding: 0 5%;
    display: flex; justify-content: space-between; align-items: center;
}
.logo {
    font-family: var(--font-serif); font-size: 1.5rem; font-weight: 600;
    color: var(--text-primary); text-decoration: none; position: relative; z-index: 101;
}
.nav-links { display: flex; list-style: none; gap: 2.5rem; }
.nav-links a { color: #bbbbbb; text-decoration: none; font-size: 0.95rem; transition: color 0.3s ease; }
.nav-links a:hover { color: var(--text-primary); }

/* Mobile Menu Button */
.mobile-menu-btn {
    display: none; background: none; border: none; cursor: pointer;
    flex-direction: column; gap: 5px; z-index: 101;
}
.mobile-menu-btn .bar {
    display: block; width: 25px; height: 2px; background-color: var(--text-primary);
    transition: transform 0.3s, opacity 0.3s;
}

.mobile-menu-btn.active .bar:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.mobile-menu-btn.active .bar:nth-child(2) { opacity: 0; }
.mobile-menu-btn.active .bar:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* Mobile Menu Overlay */
.mobile-menu-overlay {
    position: fixed; top: 0; left: 0; width: 100%; height: 100vh;
    background-color: rgba(0, 0, 0, 0.98); z-index: 90;
    display: flex; flex-direction: column; justify-content: center; align-items: center;
    opacity: 0; pointer-events: none; transition: opacity 0.4s ease;
}
.mobile-menu-overlay.active { opacity: 1; pointer-events: auto; }
.mobile-nav-links { list-style: none; text-align: center; }
.mobile-nav-links li { margin-bottom: 2rem; }
.mobile-nav-links a {
    color: var(--text-primary); text-decoration: none; font-family: var(--font-serif);
    font-size: 2.5rem; transition: color 0.3s ease;
}

/* ==========================================================================
   Hero & Image Wrappers
   ========================================================================== */
.hero {
    padding-top: var(--spacing-xl); padding-bottom: var(--spacing-lg);
    min-height: 90vh; display: flex; flex-direction: column; justify-content: center;
    background-size: cover; background-position: center; position: relative;
}
.hero-overlay {
    position: absolute; inset: 0;
    background: linear-gradient(to right, rgba(0,0,0,0.9) 0%, rgba(0,0,0,0.4) 100%); z-index: 1;
}
.hero .container { position: relative; z-index: 2; }
.hero-content { max-width: 800px; }

.visual-wrapper { width: 100%; border-radius: 8px; overflow: hidden; border: 1px solid var(--border-color); }
.responsive-img {
    width: 100%; height: auto; display: block;
    filter: brightness(0.9) contrast(1.1); transition: transform 0.5s ease;
}
.visual-wrapper:hover .responsive-img { transform: scale(1.02); }

/* ==========================================================================
   Credibility Bar
   ========================================================================== */
.credibility-bar { padding: 2rem 0; background-color: #050505; }
.cred-content { display: flex; align-items: center; gap: 3rem; overflow-x: auto; -ms-overflow-style: none; scrollbar-width: none; }
.cred-content::-webkit-scrollbar { display: none; }
.cred-text { font-size: 0.75rem; letter-spacing: 0.1em; white-space: nowrap; }
.cred-logos { display: flex; gap: 3rem; opacity: 0.6; align-items: center; }
.logo-placeholder { font-family: var(--font-sans); font-weight: 600; font-size: 1.2rem; color: #fff; letter-spacing: -0.02em; white-space: nowrap; }

/* ==========================================================================
   Ecosystem Background
   ========================================================================== */
.ecosystem-bg { position: absolute; inset: 0; background-size: cover; background-position: center; opacity: 0.18; z-index: 1; }
.ecosystem-overlay {
    position: absolute; inset: 0;
    background: linear-gradient(to bottom, rgba(0,0,0,1) 0%, rgba(0,0,0,0.6) 50%, rgba(0,0,0,1) 100%); z-index: 2;
}
/* Product showcase card — image-forward, structured (Google Labs style) */
.feature-item {
    display: flex; flex-direction: column; height: 100%;
    background: rgba(12, 12, 12, 0.72);
    border: 1px solid var(--glass-border);
    backdrop-filter: blur(16px); -webkit-backdrop-filter: blur(16px);
    border-radius: 16px; overflow: hidden;
    transition: transform 0.35s cubic-bezier(0.2,0.8,0.2,1), border-color 0.35s ease;
}
.feature-item:hover { transform: translateY(-6px); border-color: rgba(255,255,255,0.28); }
.feature-media {
    width: 100%; aspect-ratio: 3 / 2; overflow: hidden; background: #050505;
    border-bottom: 1px solid var(--glass-border);
}
.feature-media img { width: 100%; height: 100%; object-fit: cover; display: block; transition: transform 0.6s cubic-bezier(0.2,0.8,0.2,1); }
.feature-item:hover .feature-media img { transform: scale(1.05); }
.feature-body { display: flex; flex-direction: column; flex: 1; padding: 2rem 2rem 2.25rem; }
.feature-tag {
    font-family: var(--font-sans); font-size: 0.7rem; font-weight: 500;
    letter-spacing: 0.16em; text-transform: uppercase; color: var(--text-muted);
    margin-bottom: 0.9rem;
}
.feature-title { font-family: var(--font-serif); font-size: 1.7rem; margin-bottom: 0.85rem; color: var(--text-primary); }
.feature-body .paragraph-medium { margin-bottom: 0; }

/* ==========================================================================
   Research Cards (Blog)
   ========================================================================== */
.research-card {
    display: flex; flex-direction: column; text-decoration: none; padding: 2rem;
    border: 1px solid var(--border-color); border-radius: 8px;
    background-color: #080808; transition: all 0.3s ease; height: 100%;
}
.research-card:hover { border-color: #444; background-color: #111; transform: translateY(-3px); }
.research-card h3 { font-family: var(--font-serif); font-size: 1.4rem; color: #fff; margin-bottom: 1rem; line-height: 1.3; }
.btn-link {
    display: inline-block; font-family: var(--font-sans); font-size: 0.95rem; font-weight: 500;
    color: var(--text-primary); text-decoration: none; border-bottom: 1px solid var(--border-color);
    padding-bottom: 2px; transition: border-color 0.2s ease;
}
.btn-link:hover { border-color: #fff; }

/* ==========================================================================
   Careers Section
   ========================================================================== */
.jobs-list { display: flex; flex-direction: column; gap: 1rem; }
.job-item {
    display: flex; justify-content: space-between; align-items: center;
    padding: 1.5rem 2rem; border: 1px solid var(--border-color);
    border-radius: 8px; text-decoration: none; background-color: #080808;
    transition: all 0.3s ease;
}
.job-item:hover { border-color: #444; background-color: #111; }
.job-item h4 { font-family: var(--font-sans); font-size: 1.1rem; color: #fff; font-weight: 500; margin-bottom: 0.2rem; }
.job-item .arrow { color: var(--text-muted); font-size: 1.2rem; transition: transform 0.2s; }
.job-item:hover .arrow { transform: translate(3px, -3px); color: #fff; }

/* ==========================================================================
   Waitlist Form
   ========================================================================== */
.waitlist-form { display: flex; gap: 1rem; max-width: 500px; margin: 0 auto; }
.waitlist-form input {
    flex: 1; padding: 1rem 1.5rem; background: #111; border: 1px solid var(--border-color);
    border-radius: 50px; color: #fff; font-family: var(--font-sans); font-size: 1rem; transition: border-color 0.3s;
}
.waitlist-form button {
    padding: 1rem 2rem; background: #fff; color: #000; border: none;
    border-radius: 50px; font-family: var(--font-sans); font-size: 1rem; font-weight: 500;
    cursor: pointer; transition: all 0.3s ease; white-space: nowrap;
}
.waitlist-form button:hover { opacity: 0.8; }
.waitlist-form button.success { background: #333; color: #fff; cursor: default; }
.waitlist-form button:disabled { opacity: 0.6; cursor: progress; }
.waitlist-status {
    min-height: 1.25rem; margin: 1.25rem auto 0; max-width: 500px;
    font-family: var(--font-sans); font-size: 0.9rem; color: var(--text-secondary);
    opacity: 0; transition: opacity 0.3s ease;
}
.waitlist-status.show { opacity: 1; }
.waitlist-status.error { color: #ff6b6b; }

/* ==========================================================================
   Footer
   ========================================================================== */
.footer { padding: var(--spacing-lg) 0; }
.footer .nav-links { gap: 2rem; flex-wrap: wrap; }
.footer .nav-links a { color: #bbbbbb; text-decoration: none; font-size: 0.95rem; transition: color 0.3s ease; }
.footer .nav-links a:hover { color: var(--text-primary); }

/* ==========================================================================
   Legal / Content Pages (Privacy, Terms)
   ========================================================================== */
.legal-page { max-width: 760px; padding-top: calc(var(--spacing-xl) + 2rem); }
.legal-page h1 { font-family: var(--font-serif); font-size: clamp(2.5rem, 5vw, 4rem); letter-spacing: -0.02em; margin-bottom: 0.75rem; }
.legal-page .updated { color: var(--text-muted); font-size: 0.9rem; margin-bottom: var(--spacing-lg); display: block; }
.legal-page h2 { font-family: var(--font-serif); font-size: 1.6rem; margin: var(--spacing-md) 0 1rem; }
.legal-page p, .legal-page li { color: var(--text-secondary); font-weight: 300; line-height: 1.7; margin-bottom: 1rem; }
.legal-page ul { padding-left: 1.5rem; margin-bottom: 1rem; }
.legal-page a { color: var(--text-primary); }
.legal-page .back-link { display: inline-block; margin-bottom: var(--spacing-md); color: var(--text-muted); text-decoration: none; font-size: 0.95rem; transition: color 0.3s ease; }
.legal-page .back-link:hover { color: var(--text-primary); }
.legal-note { border: 1px solid var(--border-color); border-radius: 8px; background: #080808; padding: 1rem 1.25rem; font-size: 0.85rem; color: var(--text-muted); margin-bottom: var(--spacing-md); }

/* ==========================================================================
   Animations & Responsive
   ========================================================================== */
.fade-in-up { opacity: 0; transform: translateY(20px); animation: fadeInUp 1s cubic-bezier(0.2, 0.8, 0.2, 1) forwards; }
@keyframes fadeInUp { to { opacity: 1; transform: translateY(0); } }
.fade-in { opacity: 0; transform: translateY(20px); transition: opacity 1s cubic-bezier(0.2, 0.8, 0.2, 1), transform 1s cubic-bezier(0.2, 0.8, 0.2, 1); }
.fade-in.visible { opacity: 1; transform: translateY(0); }

/* Respect users who prefer reduced motion */
@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
    .fade-in, .fade-in-up { opacity: 1 !important; transform: none !important; }
}

@media (max-width: 992px) {
    .grid-2-col, .grid-3-col, .feature-grid { grid-template-columns: 1fr; gap: var(--spacing-md); }
}

@media (max-width: 768px) {
    .nav-links { display: none; }
    .mobile-menu-btn { display: flex; }
    
    .hero { background-position: left center; }
    .hero-overlay { background: rgba(0,0,0,0.7); }
    .flex-between.flex-responsive { flex-direction: column; align-items: flex-start; gap: 1rem; }
    
    .cred-content { flex-direction: column; align-items: flex-start; gap: 1rem; }
    .cred-logos { gap: 2rem; }
    
    .waitlist-form { flex-direction: column; }
    .waitlist-form input, .waitlist-form button { width: 100%; }
}