html, body {
    font-family: 'Segoe UI',sans-serif;
    overflow: hidden !important;
    background: linear-gradient(135deg, #202c47 0%, #46c8e9 100%);
    color: #222;
    margin: 0; padding: 0;
    -webkit-overflow-scrolling: auto;
}
header {
    text-align: center;
    padding: 28px 0 10px 0;
}
.logo {
    width: 120px;
    margin-bottom: 12px;
}
h1 {
    font-weight: 700;
    letter-spacing: 1.5px;
    color: #fff;
    font-size: 2.1em;
    margin: 0 0 8px 0;
}
.desc {
    color: #d0ecf4;
    margin: 0 0 18px 0;
    font-size: 1.08em;
}
main {
    max-width: 450px;
    margin: 0 auto;
    background: #ffffffcc;
    border-radius: 18px;
    box-shadow: 0 8px 32px 2px rgba(0,0,0,0.17);
    padding: 32px 24px 18px 24px;
}
.test-block {
    margin-bottom: 26px;
    border-bottom: 1px solid #b9e9f6;
    padding-bottom: 18px;
}
.test-block:last-child {
    border-bottom: none;
}
input[type=text], input[type=number] {
    width: 97%;
    margin: 8px 0 12px 0;
    padding: 14px 11px;
    font-size: 1.10em;
    border: 1.5px solid #80c6e3;
    border-radius: 9px;
    background: #f9fcff;
    outline: none;
    transition: border 0.2s;
    box-sizing: border-box;
    box-shadow: 0 2px 8px #f1ffff11;
}
input:focus {
    border: 1.5px solid #17bde7;
}
button {
    background: linear-gradient(90deg,#1ba8dd 0%,#23e9cb 100%);
    color: #fff;
    font-weight: bold;
    padding: 13px 0;
    border: none;
    border-radius: 9px;
    font-size: 1.13em;
    cursor: pointer;
    margin-bottom: 5px;
    margin-top: 4px;
    box-shadow: 0 4px 15px #a9f7e911;
    width: 100%;
    transition: background 0.22s,transform 0.15s;
    letter-spacing: 1px;
}
button:hover {
    background: linear-gradient(90deg,#2080c0 0%,#16b798 100%);
    transform: translateY(-2px) scale(1.02);
}
.result {
    margin-top: 9px;
    min-height: 22px;
    font-size: 1.07em;
    color: #145b6e;
    word-break: break-all;
}
footer {
    text-align: center;
    color: #fff;
    padding: 18px 0 10px 0;
    font-size: 1.01em;
}

@media (max-width: 700px) {
    main {
        max-width: 100vw;
        border-radius: 0;
        padding: 12vw 2vw 6vw 2vw;
        box-shadow: none;
        margin: 0;
    }
    header {
        padding: 14px 0 8px 0;
    }
    h1 {
        font-size: 1.19em;
        line-height: 1.15;
        margin-bottom: 6px;
    }
    .logo {
        width: 79px;
    }
    .test-block {
        padding-bottom: 11px;
        margin-bottom: 18px;
    }
    input[type=text], input[type=number] {
        font-size: 1.07em;
        padding: 13px 7px;
        border-radius: 8px;
        width: 100%;
    }
    button {
        width: 100%;
        margin-top: 6px;
        padding: 14px 0;
        font-size: 1.13em;
        border-radius: 8px;
    }
    .result {
        font-size: 0.99em;
        min-height: 26px;
        margin-bottom: 7px;
    }
}