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

body {
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    font-family: Arial, Helvetica, sans-serif;
    background-color: #1e293b;
    color: #f8fafc;
    transition: background-color 0.35s ease;
}

main {
    width: 100%;
    padding: 20px;
}

.color-app {
    max-width: 460px;
    margin: 0 auto;
    text-align: center;
    background: rgba(15, 23, 42, 0.8);
    border: 1px solid rgba(148, 163, 184, 0.35);
    border-radius: 14px;
    padding: 28px 22px;
    backdrop-filter: blur(4px);
}

h1 {
    font-size: 34px;
    margin-bottom: 10px;
}

p {
    color: #cbd5e1;
    line-height: 1.5;
    margin-bottom: 18px;
}

.color-box {
    background-color: rgba(30, 41, 59, 0.95);
    border: 1px solid #334155;
    border-radius: 10px;
    padding: 14px;
    margin-bottom: 16px;
}

.color-box span {
    display: block;
    font-size: 14px;
    color: #94a3b8;
}

.color-box strong {
    font-size: 28px;
    margin-top: 6px;
    display: inline-block;
    letter-spacing: 0.04em;
}

button {
    border: none;
    border-radius: 10px;
    padding: 11px 20px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    color: #0f172a;
    background-color: #f8fafc;
    transition: all 0.2s ease;
}

button:hover {
    transform: translateY(-1px);
}