:root {
    --bg-dark: #07090F;
    --text-main: #F8FAFC;
    --text-muted: #94A3B8;
    --accent: #FFD700;
    --accent-secondary: #BEF264;
    --accent-glow: rgba(255, 215, 0, 0.4);
    --lime-glow: rgba(190, 242, 100, 0.3);
    
    --font-heading: 'Space Grotesk', sans-serif;
    --font-body: 'Inter', sans-serif;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    background-color: var(--bg-dark);
    color: var(--text-main);
    font-family: var(--font-body);
    line-height: 1.6;
    overflow-x: hidden;
    position: relative;
    /* Static-depth responsive grid background */
    background-image: 
        radial-gradient(circle at 50% 50%, rgba(15, 23, 42, 0.5) 0%, var(--bg-dark) 80%),
        linear-gradient(rgba(255,255,255,0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255,255,255,0.03) 1px, transparent 1px);
    background-size: 100% 100%, 40px 40px, 40px 40px;
    background-attachment: fixed;
}

.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
}

/* Typography */
h1, h2, h3 {
    font-family: var(--font-heading);
    font-weight: 700;
}

h1 {
    font-size: clamp(2.5rem, 7vw, 5.5rem);
    line-height: 1;
    margin-bottom: 2rem;
    letter-spacing: -0.05em;
    text-transform: uppercase;
}

.highlight {
    color: var(--accent);
}

/* Nav */
.navbar {
    position: fixed;
    top: 0;
    width: 100%;
    padding: 1.25rem 0;
    z-index: 1000;
    background: rgba(7, 9, 15, 0.85);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

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

.logo {
    font-family: var(--font-heading);
    font-size: 1.25rem;
    font-weight: 800;
}

.nav-controls {
    display: flex;
    align-items: center;
    gap: 1.5rem;
}

.lang-selector {
    display: flex;
    gap: 2px;
    background: rgba(255, 255, 255, 0.05);
    padding: 2px;
    border-radius: 6px;
}

.lang-btn {
    background: transparent;
    border: none;
    color: var(--text-muted);
    font-size: 0.75rem;
    font-weight: 800;
    cursor: pointer;
    padding: 0.4rem 0.8rem;
    border-radius: 4px;
    transition: 0.2s;
}

.lang-btn.active {
    background: var(--text-main);
    color: var(--bg-dark);
}

/* Buttons */
.btn-primary {
    display: inline-block;
    background: var(--accent-secondary);
    color: var(--bg-dark);
    font-family: var(--font-heading);
    font-size: 1rem;
    font-weight: 800;
    padding: 1.25rem 2.5rem;
    border-radius: 8px;
    transition: 0.3s cubic-bezier(0.19, 1, 0.22, 1);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    border: none;
    cursor: pointer;
    box-shadow: 0 10px 30px var(--lime-glow);
    text-decoration: none;
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 15px 40px var(--lime-glow);
    background: #FFF;
}

/* Hero Section */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    position: relative;
    padding: 140px 0 80px;
    z-index: 10;
}

.hero-label {
    font-family: var(--font-heading);
    font-size: 0.75rem;
    font-weight: 800;
    letter-spacing: 0.4em;
    text-transform: uppercase;
    color: var(--accent-secondary);
    margin-bottom: 1.5rem;
}

.hero-subtitle {
    font-size: clamp(1.1rem, 2vw, 1.4rem);
    color: var(--text-muted);
    max-width: 650px;
    margin-bottom: 3.5rem;
    border-left: 2px solid var(--accent);
    padding-left: 1.5rem;
}

/* Feature Grid */
.features {
    padding: 100px 0;
    position: relative;
    z-index: 10;
}

.grid-layout {
    display: grid;
    grid-template-columns: repeat(12, 1fr);
    gap: 1.5rem;
}

.card {
    background: rgba(15, 23, 42, 0.6);
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: 16px;
    padding: 3rem;
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    transition: 0.4s cubic-bezier(0.23, 1, 0.32, 1);
}

.card:hover {
    background: rgba(15, 23, 42, 0.8);
    border-color: rgba(255, 255, 255, 0.15);
    transform: translateY(-5px);
}

.card.big { grid-column: span 8; }
.card.small { grid-column: span 4; }

.card-tag {
    font-size: 0.7rem;
    font-weight: 800;
    color: var(--accent-secondary);
    text-transform: uppercase;
    letter-spacing: 0.1em;
    margin-bottom: 1rem;
    display: block;
}

/* Robust Pure-CSS Reveal Animations */
.reveal-text {
    opacity: 0;
    transform: translateY(20px);
    animation: revealCSS 0.8s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

@keyframes revealCSS {
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Delay classes */
.delay-1 { animation-delay: 0.1s; }
.delay-2 { animation-delay: 0.2s; }
.delay-3 { animation-delay: 0.3s; }
.delay-4 { animation-delay: 0.4s; }

/* Hidden state for scroll observer */
.card.hidden {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.8s ease, transform 0.8s ease;
}

.card.show-anim {
    opacity: 1;
    transform: translateY(0);
}

@media (max-width: 991px) {
    .card.big, .card.small { grid-column: span 12; }
    h1 { font-size: 3rem; }
}