:root {
    --navy: #0b1b3a;
    --paper: #f6f7fb;
    --ink: #0b1b3a;
    --muted: #4b5878;
    --line: #d9deea;
    --card: #ffffff;
    --glow: rgba(119, 51, 255, .28);
    --accent1: #4d4dff;
    --accent2: #7733ff;
    --accent3: #00c2ff;
    --shadow: 0 0.75rem 2rem rgba(11, 27, 58, .12);
    --radius: 1rem;
}

* {
    box-sizing: border-box;
}

html {
    color-scheme: light;
}

body {
    margin: 0;
    font-family: system-ui, -apple-system, Segoe UI, Roboto, Arial, sans-serif;
    line-height: 1.4;
    color: var(--ink);
    background:
        radial-gradient(60rem 40rem at 10% -10%, rgba(0, 194, 255, .18), transparent 55%),
        radial-gradient(55rem 35rem at 110% 10%, rgba(119, 51, 255, .18), transparent 55%),
        linear-gradient(180deg, var(--paper), #ffffff);
}

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

.page {
    width: min(80rem, 100%);
    margin: 0 auto;
    padding: 1rem;
}

.hero {
    padding: clamp(1rem, 2.5vw, 2rem);
    border-radius: var(--radius);
    background:
        linear-gradient(135deg, rgba(77, 77, 255, .12), rgba(0, 194, 255, .10), rgba(119, 51, 255, .10));
    box-shadow: var(--shadow);
    border: 1px solid rgba(217, 222, 234, .7);
}

.hero__title {
    margin: 0 0 .35rem 0;
    font-weight: 800;
    letter-spacing: .2px;
    font-size: clamp(1.35rem, 3.2vw, 2.1rem);
    color: var(--navy);
}

.hero__subtitle {
    margin: 0;
    font-weight: 700;
    color: rgba(11, 27, 58, .9);
    font-size: clamp(1rem, 2.4vw, 1.25rem);
}

.card {
    margin-top: 1rem;
    background: var(--card);
    border-radius: var(--radius);
    border: 1px solid rgba(217, 222, 234, .85);
    box-shadow: var(--shadow);
    padding: clamp(1rem, 2.2vw, 1.5rem);
    position: relative;
    overflow: hidden;
}

.card::before {
    content: "";
    position: absolute;
    inset: -2px;
    background: linear-gradient(120deg, rgba(77, 77, 255, .15), rgba(0, 194, 255, .12), rgba(119, 51, 255, .15));
    filter: blur(18px);
    opacity: .55;
    pointer-events: none;
}

.form {
    position: relative;
    z-index: 1;
}

.row {
    display: grid;
    grid-template-columns: auto auto;
    gap: 1.25rem;
    justify-content: center;
    align-items: start;
}


.field {
    display: flex;
    flex-direction: column;
    align-items: center;
}


.field--unit {
    max-width: 12rem;
}

.label {
    display: block;
    font-weight: 700;
    color: var(--navy);
    margin-bottom: .35rem;
    font-size: 1.2rem;
    text-align: center;
    width: 100%;
}

.input,
.select {
    width: 100%;
    border: 1px solid rgba(217, 222, 234, .95);
    border-radius: .85rem;
    padding: .85rem .9rem;
    font-size: 1.05rem;
    background: rgba(255, 255, 255, .92);
    color: var(--ink);
    outline: none;
    box-shadow: 0 0 0 0 rgba(119, 51, 255, 0);
    transition: box-shadow .18s ease, border-color .18s ease, transform .12s ease;
}

.input:focus,
.select:focus {
    border-color: rgba(119, 51, 255, .55);
    box-shadow: 0 0 0 .25rem var(--glow);
}


.input--num {
    max-width: 14ch;
    text-align: right;
}


.field {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.label {
    width: 100%;
    max-width: 14ch;
}

.input--num {
    max-width: 14ch;
    margin-left: auto;
    margin-right: auto;
}

.select {
    max-width: 8ch;
    text-align: left;
}

.actions {
    display: flex;
    gap: .75rem;
    margin-top: .9rem;
    flex-wrap: wrap;
    justify-content: center;
}

.btn {
    appearance: none;
    border: 0;
    border-radius: 999px;
    padding: .85rem 1.1rem;
    font-weight: 800;
    letter-spacing: .2px;
    cursor: pointer;
    user-select: none;
    transition: transform .12s ease, filter .18s ease, box-shadow .18s ease, background .18s ease;
}

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

.btn--primary {
    color: #fff;
    background: linear-gradient(120deg, var(--accent2), var(--accent1), var(--accent3));
    box-shadow: 0 .9rem 1.6rem rgba(77, 77, 255, .20), 0 .5rem 1rem rgba(0, 194, 255, .16);
}

.btn--primary:hover {
    filter: brightness(1.08) saturate(1.12);
    box-shadow: 0 1.1rem 1.9rem rgba(119, 51, 255, .22), 0 .55rem 1.1rem rgba(0, 194, 255, .18);
}

.btn--ghost {
    color: var(--navy);
    background: rgba(11, 27, 58, .06);
    border: 1px solid rgba(11, 27, 58, .14);
}

.btn--ghost:hover {
    background: rgba(119, 51, 255, .10);
    border-color: rgba(119, 51, 255, .22);
}

.help {
    margin: .85rem 0 0 0;
    color: var(--muted);
    font-size: .98rem;
}

.notice {
    margin-top: .9rem;
    padding: .9rem 1rem;
    border-radius: .9rem;
    border: 1px solid rgba(217, 222, 234, .9);
    background: rgba(255, 255, 255, .92);
    box-shadow: 0 .6rem 1.2rem rgba(11, 27, 58, .08);
    text-align: center;
    font-weight: 800;
    color: var(--navy);
}

.notice--warn {
    background: linear-gradient(180deg, rgba(255, 245, 230, .95), rgba(255, 255, 255, .92));
    border-color: rgba(255, 182, 72, .55);
}

.notice--error {
    background: linear-gradient(180deg, rgba(255, 235, 240, .95), rgba(255, 255, 255, .92));
    border-color: rgba(255, 76, 120, .45);
}

.result {
    margin-top: .9rem;
    padding: 1rem 1.1rem;
    border-radius: .9rem;
    border: 1px solid rgba(119, 51, 255, .30);
    background: linear-gradient(135deg, rgba(77, 77, 255, .10), rgba(0, 194, 255, .08), rgba(119, 51, 255, .10));
    box-shadow: 0 .9rem 1.6rem rgba(119, 51, 255, .10);
    text-align: center;
    color: var(--navy);
    font-size: 1.15rem;
}

.facts {
    margin-top: 1rem;
}

.facts__box {
    border-radius: var(--radius);
    border: 1px solid rgba(217, 222, 234, .85);
    background: rgba(255, 255, 255, .92);
    box-shadow: var(--shadow);
    padding: 1rem 1.1rem;
}

.facts__text {
    margin: 0;
    color: #001a66;
    font-size: 1rem;
}

.seo {
    margin-top: 1rem;
    background: rgba(255, 255, 255, .92);
    border: 1px solid rgba(217, 222, 234, .85);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    padding: 1.1rem;
}

.seo__title {
    margin: 0 0 .5rem 0;
    color: var(--navy);
    font-size: 1.2rem;
}

.seo__text {
    margin: 0 0 1rem 0;
    color: rgba(11, 27, 58, .92);
    font-size: 1rem;
}

.seo__fine {
    margin: .25rem 0 0 0;
    color: var(--muted);
    font-size: .92rem;
}

@media (max-width: 48rem) {
    .page {
        padding: .6rem;
    }

    .row {
        grid-template-columns: 1fr;
    }

    .field--unit {
        max-width: 100%;
    }

    .actions {
        gap: .6rem;
    }

    .btn {
        width: 100%;
    }
}