:root {
    --primary-color: #F81D3C;
    --glow-color: rgba(248, 29, 60, 0.5);
    --secondary-color: #f0f0f5;
    --text-color-muted: #f0f0f5;
    --background-color: #0D0D1A;
    --glass-bg: rgba(18, 18, 28, 0.55);
    --glass-border: rgba(255, 255, 255, 0.08);
    --font-family: 'Poppins', sans-serif;
    --mouse-x: 50vw;
    --mouse-y: 50vh;
}


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

html { scroll-behavior: smooth; }

body {
    font-family: var(--font-family);
    background-color: var(--background-color);
    color: var(--secondary-color);
    line-height: 1.7;
    background-image: radial-gradient(
        circle 800px at var(--mouse-x) var(--mouse-y),
        rgba(248, 29, 60, 0.15),
        transparent 70%
    );
    background-attachment: fixed;
    transition: background-color 0.3s ease;
}

.container { max-width: 1200px; margin: 0 auto; padding: 0 2rem; }
.highlight { color: var(--primary-color); text-shadow: 0 0 10px var(--glow-color); }
.grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(320px, 1fr)); gap: 2.5rem; margin-top: 3rem; }

/* Giriş Animasyonları */
.card, section h2, .section-subtitle, .hero-content > *, .contact-box {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}
.visible { opacity: 1; transform: translateY(0); }

/* Ortak Kart Yapısı (Base) */
.card {
    background: var(--glass-bg); 
    padding: 2.5rem; 
    border-radius: 18px;
    position: relative; 
    overflow: hidden;
    transition: transform 0.4s ease, box-shadow 0.4s ease;
    border: 1px solid transparent;
    display: flex;
    flex-direction: column;
}

.card::before {
    content: ''; position: absolute; top: 0; left: 0; width: 100%; height: 100%;
    border-radius: inherit;
    padding: 1px;
    background: linear-gradient(135deg, var(--glass-border), transparent);
    -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
    mask-composite: exclude; -webkit-mask-composite: xor;
    transition: background 0.4s ease;
}
.card:hover { transform: translateY(-15px); box-shadow: 0 20px 40px rgba(0,0,0,0.3); }
.card:hover::before { background: linear-gradient(135deg, var(--primary-color), var(--glow-color)); }