:root {
    --pc91-blue: #00a8ff;
    --pc91-dark: #2f3640;
    --pc91-light: #f5f6fa;
}

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

body {
    background-color: var(--pc91-light);
    font-family: 'Segoe UI', Tahoma, sans-serif;
    color: var(--pc91-dark);
}

.container {
    max-width: 1000px;
    margin: 0 auto;
    padding: 0 20px;
}

header {
    background: #fff;
    padding: 15px 0;
    border-bottom: 1px solid #dcdde1;
}

.logo {
    font-size: 24px;
    font-weight: 800;
    color: var(--pc91-blue);
}

nav ul { display: flex; list-style: none; float: right; margin-top: 5px; }
nav li { margin-left: 20px; }
nav a { text-decoration: none; color: #7f8c8d; font-weight: 600; }
nav a:hover { color: var(--pc91-blue); }

.hero-pc {
    background: #fff;
    padding: 80px 0;
    text-align: center;
}

.hero-pc h1 { font-size: 42px; margin-bottom: 20px; }

.dl-btn {
    display: inline-block;
    background: var(--pc91-blue);
    color: #fff;
    padding: 15px 50px;
    border-radius: 30px;
    text-decoration: none;
    font-weight: bold;
    font-size: 18px;
    margin-top: 20px;
}

.pc-features {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
    margin-top: 60px;
}

.pc-card {
    background: #fff;
    padding: 30px;
    border-radius: 10px;
    text-align: center;
    box-shadow: 0 10px 20px rgba(0,0,0,0.05);
}

footer {
    padding: 40px 0;
    background: var(--pc91-dark);
    color: #fff;
    text-align: center;
    margin-top: 80px;
}