:root {
    --bg-dark: #0A0A0A;
    --text-dark: #E0E0E0;
    --text-muted-dark: #888888;
    --accent: #0070F3;
    --accent-hover: #0056B3;
    --glass-dark: rgba(255, 255, 255, 0.05);
    --border-dark: rgba(255, 255, 255, 0.1);
}

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--bg-dark);
    color: var(--text-dark);
    transition: background-color 0.5s, color 0.5s;
}

.hero-video {
    position: absolute; top: 50%; left: 50%;
    transform: translate(-50%, -50%);
    min-width: 100%; min-height: 100%; width: auto; height: auto;
    z-index: -1; object-fit: cover; opacity: 0.15;
}
.hero-overlay { background: radial-gradient(ellipse at center, rgba(0,0,0,0.4) 0%, rgba(0,0,0,0.9) 100%); }

.glass-card {
    background: var(--glass-dark);
    backdrop-filter: blur(20px); -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--border-dark);
    transition: all 0.3s ease;
}
.glass-card:hover { transform: translateY(-5px) scale(1.02); box-shadow: 0 0 40px rgba(0, 112, 243, 0.3); border-color: var(--accent); }

.btn-primary {
    background: var(--accent);
    color: white;
    padding: 1rem 2.5rem;
    border-radius: 9999px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 1px;
    transition: all 0.3s ease;
    box-shadow: 0 4px 20px rgba(0, 112, 243, 0.4);
    border: 2px solid transparent;
}
.btn-primary:hover { background: var(--accent-hover); transform: translateY(-3px); box-shadow: 0 7px 30px rgba(0, 112, 243, 0.6); }

.section-title {
    font-size: 3.5rem; font-weight: 900; line-height: 1.2;
    background: -webkit-linear-gradient(45deg, #fff, #aaa);
    -webkit-background-clip: text; -webkit-text-fill-color: transparent;
}

.tech-logo-wall img {
    transition: transform 0.3s, filter 0.3s;
    filter: grayscale(100%) brightness(0.8);
}
.tech-logo-wall img:hover {
    transform: scale(1.1);
    filter: grayscale(0%) brightness(1);
}

.certificate-card {
    transition: transform 0.3s, box-shadow 0.3s;
}
.certificate-card:hover {
     transform: scale(1.05);
     box-shadow: 0 10px 30px rgba(0,0,0,0.3);
}

.certificate-card img {
    height: 6rem;
}

.certificate-card p {
    font-size: 1.125rem;
    line-height: 1.75rem;
}

#header.scrolled {
    background-color: rgba(10, 10, 10, 0.7);
    backdrop-filter: blur(10px); -webkit-backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-dark);
}