* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: "Segoe UI", Arial, sans-serif;
}

body {
    background: radial-gradient(circle at top, #151a25, #0b0e14 70%);
    color: #e6e9f0;
    line-height: 1.7;
}

header {
    background: rgba(10, 12, 18, 0.85);
    backdrop-filter: blur(8px);
    padding: 20px 40px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid #1f2636;
    position: sticky;
    top: 0;
    z-index: 100;
}

.logo {
    font-size: 24px;
    font-weight: 700;
    color: #6fb3ff;
    letter-spacing: 0.5px;
}

nav a {
    margin-left: 18px;
    text-decoration: none;
    color: #d5d9e5;
    font-size: 14px;
    position: relative;
}

nav a::after {
    content: "";
    position: absolute;
    left: 0;
    bottom: -6px;
    width: 0;
    height: 2px;
    background: #6fb3ff;
    transition: width 0.3s;
}

nav a:hover::after {
    width: 100%;
}

.container {
    max-width: 1200px;
    margin: 70px auto;
    padding: 0 30px;
}

h1 {
    font-size: 38px;
    margin-bottom: 30px;
}

h2 {
    font-size: 22px;
    margin-bottom: 12px;
    color: #ffffff;
}

.card {
    background: linear-gradient(145deg, #1b2133, #161b2a);
    padding: 30px;
    border-radius: 14px;
    margin-bottom: 30px;
    box-shadow: 0 15px 40px rgba(0,0,0,0.35);
    border: 1px solid #242c42;
}

.card ul, .card ol {
    margin-left: 20px;
}

footer {
    margin-top: 80px;
    padding: 30px;
    text-align: center;
    background: #0a0d14;
    border-top: 1px solid #1f2636;
    font-size: 14px;
    color: #9aa3b2;
}