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

/* Background */
body {
    min-height: 100vh;
    background: #0f172a; /* dark navy */
    display: flex;
    justify-content: center;
    align-items: center;
    color: #e5e7eb;
}

/* Card */
.card {
    background: #020617;
    padding: 40px 50px;
    border-radius: 16px;
    text-align: center;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.6);
}

/* Title */
.card h1 {
    font-size: 2.2rem;
    margin-bottom: 10px;
    color: #38bdf8;
}

/* Subtitle */
.card p {
    font-size: 1rem;
    margin-bottom: 25px;
    color: #94a3b8;
}

/* Button */
.btn {
    display: inline-block;
    padding: 12px 28px;
    background: transparent;
    border: 2px solid #38bdf8;
    color: #38bdf8;
    text-decoration: none;
    border-radius: 999px;
    font-weight: 600;
    transition: all 0.3s ease;
}

.btn:hover {
    background: #38bdf8;
    color: #020617;
    transform: translateY(-3px);
}