/* ==========================
   Global shared styling
========================== */
* {
    margin: 0; padding: 0;
    box-sizing: border-box;
    -webkit-tap-highlight-color: transparent;
    font-family: "Inter", sans-serif;
}

body {
    background: linear-gradient(135deg, #0d1b2a, #1b263b, #415a77);
    color: white;
    overflow-x: hidden;
    height: 100vh;
}

h1, h2, h3 {
    text-align: center;
    margin-bottom: 25px;
    letter-spacing: 0.5px;
}

.button {
    cursor: pointer;
    border: none;
    border-radius: 18px;
    padding: 20px;
    width: 90%;
    max-width: 480px;
    margin: 15px auto;
    display: block;
    background: rgba(255,255,255,0.08);
    backdrop-filter: blur(8px);
    color: white;
    font-size: 24px;
    transition: 0.2s;
    box-shadow: 0 4px 20px rgba(0,0,0,0.25);
}

.button:hover {
    transform: scale(1.04);
    background: rgba(255,255,255,0.18);
}