:root {
    --ink: #16233b;
    --muted: #64708a;
    --line: #e2e8f2;
    --bg: #f4f7fb;
    --card: #ffffff;
    --brand: #1a56db;
    --brand-dark: #1240a8;
    --brand-soft: #eef4ff;
    --danger: #b42318;
}

* {
    box-sizing: border-box;
}

html {
    -webkit-text-size-adjust: 100%;
}

body {
    margin: 0;
    color: var(--ink);
    background:
        radial-gradient(1200px 420px at 50% -180px, #dce8ff 0%, rgba(220, 232, 255, 0) 70%),
        var(--bg);
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
    font-size: 16px;
    line-height: 1.65;
}

.wrap {
    max-width: 880px;
    margin: 0 auto;
    padding: 0 20px 72px;
}

.hero {
    padding: 64px 0 30px;
    text-align: center;
}

.hero h1 {
    margin: 0;
    font-size: 34px;
    line-height: 1.3;
    letter-spacing: .5px;
    font-weight: 800;
}

.lede {
    max-width: 640px;
    margin: 14px auto 0;
    color: var(--muted);
    font-size: 16px;
}

.calc {
    padding: 30px;
    background: var(--card);
    border: 1px solid var(--line);
    border-radius: 18px;
    box-shadow: 0 14px 40px rgba(22, 35, 59, .07);
}

.grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
}

.field label {
    display: block;
    margin-bottom: 7px;
    color: #34405a;
    font-size: 13px;
    font-weight: 600;
    letter-spacing: .3px;
}

.field input,
.field select {
    width: 100%;
    height: 48px;
    padding: 0 14px;
    color: var(--ink);
    background: #fff;
    border: 1px solid #cfd8e6;
    border-radius: 10px;
    font: inherit;
    font-size: 15px;
    transition: border-color .15s ease, box-shadow .15s ease;
}

.field select {
    padding-right: 34px;
}

.field input::placeholder {
    color: #9aa5b8;
}

.field input:focus,
.field select:focus {
    outline: none;
    border-color: var(--brand);
    box-shadow: 0 0 0 3px rgba(26, 86, 219, .14);
}

.field-wide {
    grid-column: 1 / -1;
}

.input-unit {
    position: relative;
}

.input-unit input {
    padding-right: 62px;
}

.input-unit span {
    position: absolute;
    top: 50%;
    right: 14px;
    color: var(--muted);
    font-size: 14px;
    transform: translateY(-50%);
    pointer-events: none;
}

.submit {
    width: 100%;
    height: 50px;
    margin-top: 24px;
    color: #fff;
    background: linear-gradient(135deg, var(--brand) 0%, var(--brand-dark) 100%);
    border: 0;
    border-radius: 10px;
    font: inherit;
    font-size: 16px;
    font-weight: 700;
    letter-spacing: 1px;
    cursor: pointer;
    transition: filter .15s ease, transform .15s ease;
}

.submit:hover {
    filter: brightness(1.06);
}

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

.result {
    margin-top: 26px;
    padding-top: 24px;
    border-top: 1px solid var(--line);
}

.result-head {
    display: flex;
    align-items: flex-end;
    justify-content: space-between;
    gap: 24px;
}

.result-label {
    color: var(--muted);
    font-size: 14px;
}

.result-amount {
    margin-top: 2px;
    color: var(--brand);
    font-size: 40px;
    line-height: 1.15;
    font-weight: 800;
    letter-spacing: .5px;
}

.result-meta {
    margin: 0;
    color: var(--muted);
    font-size: 13px;
    text-align: right;
}

.quote-list {
    margin: 22px 0 0;
    padding: 0;
    list-style: none;
}

.quote-list li {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    padding: 13px 0;
    border-bottom: 1px dashed var(--line);
    font-size: 15px;
}

.quote-list li:first-child {
    padding-top: 4px;
}

.quote-list li span {
    color: #34405a;
}

.quote-list li b {
    color: var(--ink);
    font-weight: 700;
    font-variant-numeric: tabular-nums;
}

.disclaimer {
    margin: 18px 0 0;
    color: var(--muted);
    font-size: 12px;
}

.alert {
    padding: 13px 16px;
    color: var(--danger);
    background: #fef3f2;
    border: 1px solid #fecdca;
    border-radius: 10px;
    font-size: 14px;
}

.seo {
    margin-top: 52px;
}

.seo h2 {
    margin: 0 0 18px;
    font-size: 22px;
    line-height: 1.4;
}

.seo h2:not(:first-of-type) {
    margin-top: 44px;
}

.factors {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 14px;
}

.factor {
    padding: 18px 20px;
    background: var(--card);
    border: 1px solid var(--line);
    border-radius: 12px;
}

.factor h3 {
    margin: 0 0 5px;
    font-size: 15px;
}

.factor p {
    margin: 0;
    color: var(--muted);
    font-size: 14px;
}

details {
    margin-bottom: 10px;
    padding: 15px 20px;
    background: var(--card);
    border: 1px solid var(--line);
    border-radius: 12px;
}

details summary {
    font-size: 15px;
    font-weight: 600;
    cursor: pointer;
}

details p {
    margin: 12px 0 0;
    color: var(--muted);
    font-size: 14px;
}

@media (max-width: 640px) {
    .hero {
        padding: 42px 0 24px;
        text-align: left;
    }

    .hero h1 {
        font-size: 26px;
    }

    .calc {
        padding: 22px 18px;
        border-radius: 14px;
    }

    .grid,
    .factors {
        grid-template-columns: 1fr;
        gap: 16px;
    }

    .result-head {
        flex-direction: column;
        align-items: flex-start;
        gap: 10px;
    }

    .result-amount {
        font-size: 34px;
    }

    .result-meta {
        text-align: left;
    }

    .seo h2 {
        font-size: 20px;
    }
}