:root {
    --primary: #404040;
    --secondary: #737373;
    --accent: #262626;
    --background: #0a0a0a;
    --surface: #171717;
    --text: #fafafa;
    --font-primary: 'Syncopate', sans-serif;
    --font-mono: 'Amatic SC', serif;
}

::-webkit-scrollbar {
    width: 12px;
}

::-webkit-scrollbar-track {
    background: var(--background);
    border-left: 1px solid rgba(64, 64, 64, 0.2);
}

::-webkit-scrollbar-thumb {
    background: linear-gradient(180deg, var(--primary), var(--accent));
    border-radius: 6px;
    border: 3px solid var(--background);
    transition: all 0.3s ease;
}

::-webkit-scrollbar-thumb:hover {
    background: linear-gradient(180deg, var(--secondary), var(--primary));
}

* {
    scrollbar-width: thin;
    scrollbar-color: var(--primary) var(--background);
}

body {
    background-color: var(--background);
    color: var(--text);
    font-family: var(--font-primary);
    scroll-behavior: smooth;
}

:lang(ru), .ru {
    font-family: var(--font-mono);
    font-size: 1.6em;
    line-height: 1.5;
}

.nav-glass {
    background: rgba(10, 10, 10, 0.85);
    backdrop-filter: blur(16px);
    border-bottom: 2px solid rgba(64, 64, 64, 0.3);
}

.gradient-text {
    background: linear-gradient(135deg, #525252, #171717);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
}

.feature-card {
    background: linear-gradient(145deg, var(--surface), rgba(23, 23, 23, 0.7));
    border: 2px solid rgba(64, 64, 64, 0.2);
    border-radius: 24px;
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    overflow: hidden;
}

.feature-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    border-radius: 24px;
    padding: 2px;
    background: linear-gradient(135deg, #404040, #262626);
    -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
    mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
    -webkit-mask-composite: xor;
    mask-composite: exclude;
    opacity: 0;
    transition: opacity 0.4s ease;
}

.feature-card:hover {
    transform: translateY(-8px) scale(1.02);
    box-shadow: 0 20px 40px rgba(38, 38, 38, 0.25);
}

.feature-card:hover::before {
    opacity: 1;
}

.api-card {
    background: rgba(23, 23, 23, 0.9);
    border: 2px solid rgba(64, 64, 64, 0.2);
    border-radius: 16px;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    backdrop-filter: blur(8px);
}

.api-card:hover {
    background: rgba(64, 64, 64, 0.15);
    border-color: var(--accent);
    transform: translateY(-4px);
    box-shadow: 0 12px 24px rgba(38, 38, 38, 0.2);
}

.hero-pattern {
    background-image: 
        radial-gradient(circle at 20px 20px, rgba(64, 64, 64, 0.15) 2px, transparent 0),
        radial-gradient(circle at 40px 40px, rgba(38, 38, 38, 0.1) 2px, transparent 0);
    background-size: 40px 40px;
}

.glow {
    box-shadow: 0 0 30px rgba(64, 64, 64, 0.3);
}

.code-block {
    font-family: var(--font-mono);
    background: var(--surface);
    border-radius: 12px;
    padding: 1.25rem;
}

@keyframes float {
    0% { transform: translateY(0px) rotate(0deg); }
    50% { transform: translateY(-20px) rotate(2deg); }
    100% { transform: translateY(0px) rotate(0deg); }
}

.floating {
    animation: float 8s cubic-bezier(0.4, 0, 0.2, 1) infinite;
}

.feature-card.active {
    transform: scale(1.05);
    box-shadow: 0 25px 50px rgba(38, 38, 38, 0.3);
}