:root {
    --bg: #ffffff;
    --ink: #000080;
    --muted: #2b2b6b;
    --accent: #008080;
    --accent2: #800080;
    --card: #f6f7ff;
    --line: rgba(0, 0, 128, .18);
    --shadow: 0 0.9rem 2.1rem rgba(0, 0, 80, .10);
    --radius: 1.1rem;
}

* {
    box-sizing: border-box;
}

html {
    font-size: 100%;
}

body {
    margin: 0;
    color: var(--ink);
    background: var(--bg);
    font-family: system-ui, -apple-system, "Segoe UI", Roboto, Arial, sans-serif;
    line-height: 1.4;
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

.page {
    max-width: 80rem;
    margin: 0 auto;
    padding: 1.1rem;
}

@media (max-width: 40rem) {
    .page {
        padding: 0.75rem;
    }
}

.hero {
    padding: 1.2rem 1.2rem 0.7rem;
    border-radius: var(--radius);
    background:
        radial-gradient(1200px 300px at 10% 0%, rgba(0, 128, 128, .14), transparent 60%),
        radial-gradient(900px 300px at 100% 20%, rgba(128, 0, 128, .10), transparent 55%),
        linear-gradient(180deg, rgba(0, 0, 128, .06), transparent 55%);
    border: 1px solid var(--line);
    box-shadow: var(--shadow);
}

.kicker {
    margin: 0 0 0.5rem;
    font-weight: 700;
    color: var(--accent2);
    letter-spacing: 0.01em;
    font-size: clamp(0.95rem, 2.2vw, 1.05rem);
}

h1 {
    margin: 0 0 0.6rem;
    font-size: clamp(1.3rem, 3vw, 2rem);
    letter-spacing: -0.01em;
}
h2 {
    margin: 0 0 0.5rem;
    font-size: clamp(1.05rem, 2.5vw, 1.3rem);
    color: var(--ink);
}

.lead {
    margin: 0 0 1rem;
    color: var(--muted);
    max-width: 50rem;
}

.howto {
    margin-top: 0.9rem;
    padding: 0.95rem;
    border-radius: calc(var(--radius) - 0.2rem);
    background: rgba(255, 255, 255, .72);
    border: 1px solid rgba(0, 0, 128, .10);
}

.muted {
    color: var(--muted);
}

.card {
    margin-top: 1.1rem;
    padding: 1.2rem;
    border-radius: var(--radius);
    background: var(--card);
    border: 1px solid var(--line);
    box-shadow: var(--shadow);
}

.ce {
    display: flex;
    justify-content: center;
}

.form {
    max-width: 40rem;
    margin: 0 auto;
    display: grid;
    gap: 0.9rem;
}

.field {
    width: 100%;
    display: grid;
    gap: 0.35rem;
    justify-items: center;
}

label {
    font-weight: 700;
    text-align: center;
}

input {
    width: min(12rem, 100%);
    padding: 0.8rem 0.9rem;
    border-radius: 0.85rem;
    border: 1px solid rgba(0, 0, 128, .22);
    background: #fff;
    color: var(--ink);
    font-size: 1rem;
    outline: none;
}

input:focus {
    border-color: rgba(0, 128, 128, .8);
    box-shadow: 0 0 0 0.25rem rgba(0, 128, 128, .18);
}

input[type="number"],
.num {
    text-align: right;
    font-variant-numeric: tabular-nums;
}

.hint {
    margin: 0;
    font-size: 0.95rem;
    color: rgba(0, 0, 128, .75);
    text-align: center;
    max-width: 30rem;
}

.actions {
    display: flex;
    gap: 0.75rem;
    justify-content: center;
    align-items: center;
    flex-wrap: wrap;
    margin-top: 0.25rem;
}

.btn {
    appearance: none;
    border: 1px solid transparent;
    border-radius: 999px;
    padding: 0.78rem 1.1rem;
    font-weight: 800;
    font-size: 1rem;
    cursor: pointer;
    transition: transform .12s ease, box-shadow .12s ease, background-color .12s ease, border-color .12s ease;
    min-width: 9.5rem;
}

.btn:active {
    transform: translateY(1px);
}

.btn-primary {
    color: #fff;
    background: linear-gradient(135deg, rgba(0, 128, 128, .95), rgba(0, 0, 128, .90));
    box-shadow: 0 0.9rem 1.8rem rgba(0, 0, 80, .18);
    border-color: rgba(0, 0, 128, .15);
}

.btn-primary:hover {
    background: linear-gradient(135deg, rgba(128, 0, 128, .92), rgba(0, 128, 128, .92));
    box-shadow: 0 1.1rem 2.2rem rgba(0, 0, 80, .22);
}

.btn-ghost {
    color: var(--ink);
    background: rgba(255, 255, 255, .75);
    border-color: rgba(0, 0, 128, .22);
}

.btn-ghost:hover {
    background: rgba(0, 128, 128, .10);
    border-color: rgba(0, 128, 128, .45);
}

@media (max-width: 40rem) {
    .btn {
        width: 100%;
        min-width: 0;
    }    
}

.notice {
    max-width: 50rem;
    margin: 1rem auto 0;
    padding: 0.9rem 1rem;
    border-radius: 1rem;
    border: 1px solid rgba(0, 0, 128, .18);
    background: rgba(255, 255, 255, .8);
    text-align: center;
}

.notice--success {
    border-color: rgba(0, 128, 128, .35);
    background: rgba(0, 128, 128, .08);
}

.notice--warning {
    border-color: rgba(128, 0, 128, .35);
    background: rgba(128, 0, 128, .07);
}

.notice--error {
    border-color: rgba(220, 0, 0, .25);
    background: rgba(220, 0, 0, .06);
}

.result {
    max-width: 50rem;
    margin: 0.9rem auto 0;
}

.result-card {
    border-radius: 1.05rem;
    border: 1px solid rgba(0, 0, 128, .18);
    background: rgba(255, 255, 255, .78);
    padding: 1rem 1rem 0.9rem;
    box-shadow: 0 0.8rem 1.8rem rgba(0, 0, 80, .10);
}

.result-main {
    margin: 0 0 0.55rem;
    font-size: clamp(1.05rem, 2.6vw, 1.25rem);
}

.result-sub {
    margin: 0 0 0.75rem;
    color: var(--ink);
}

.result-meta {
    display: grid;
    gap: 0.25rem;
    color: var(--accent2);
}

.rule {
    border: 0;
    border-top: 1px solid rgba(0, 128, 128, .35);
    margin: 1.1rem 0;
}

.info {
    margin-top: 1.2rem;
    padding: 0.2rem 0.2rem 0.8rem;
    margin-left: auto;
    margin-right: auto;
    max-width: 52rem;
}


.info h2 {
    margin: 0 0 0.4rem;
    color: var(--accent);
    font-size: clamp(1.05rem, 2.6vw, 1.25rem);
}

.info p {
    margin: 0 0 0.75rem;
    color: rgba(0, 0, 128, .85);
    max-width: 50rem;
}

.source {
    display: flex;
    flex-direction: column;
    gap: 0.35rem;
}

.updated {
    font-size: 0.95rem;
    color: rgba(0, 0, 128, .75);
}

.footer {
    margin-top: 1.3rem;
    padding: 0.6rem 0 0.2rem;
}

.footer-keywords {
    font-size: 0.95rem;
    color: rgba(0, 0, 128, .70);
    max-width: 50rem;
}

.fineprint {
    margin: 0.6rem 0 0;
    font-size: 0.95rem;
    color: rgba(0, 0, 128, .55);
}