.wallpack-calculator {
    --wpc-accent: #9a7149;
    --wpc-accent-dark: #765335;
    --wpc-ink: #201f1d;
    --wpc-muted: #68645e;
    --wpc-line: #dedad2;
    --wpc-surface: #f4f4f4;
    color: var(--wpc-ink);
    background: #fff;
    border: 1px solid var(--wpc-line);
    border-radius: 18px;
    box-shadow: 0 18px 55px rgba(34, 30, 26, 0.08);
    font: inherit;
    margin: 2rem auto;
    max-width: 1180px;
    overflow: hidden;
}

.wallpack-calculator *,
.wallpack-calculator *::before,
.wallpack-calculator *::after {
    box-sizing: border-box;
}

.wallpack-calculator__header {
    max-width: 760px;
    padding: clamp(1.5rem, 4vw, 3rem) clamp(1.25rem, 5vw, 4rem) 1.5rem;
}

.wallpack-calculator__eyebrow {
    color: var(--wpc-accent-dark);
    font-size: 0.75rem;
    font-weight: 700;
    letter-spacing: 0.14em;
    margin: 0 0 0.75rem;
    text-transform: uppercase;
}

.wallpack-calculator__header h2 {
    color: var(--wpc-ink);
    font-size: clamp(1.75rem, 4vw, 3rem);
    line-height: 1.08;
    margin: 0 0 0.85rem;
}

.wallpack-calculator__header > p:last-child {
    color: var(--wpc-muted);
    line-height: 1.65;
    margin: 0;
}

.wallpack-calculator__form {
    align-items: end;
    background: var(--wpc-surface);
    border-bottom: 1px solid var(--wpc-line);
    border-top: 1px solid var(--wpc-line);
    display: grid;
    gap: 1rem;
    grid-template-columns: repeat(3, minmax(130px, 1fr)) minmax(190px, auto);
    padding: 1.4rem clamp(1.25rem, 5vw, 4rem);
}

.wallpack-calculator__field label {
    display: block;
    font-size: 0.82rem;
    font-weight: 650;
    margin-bottom: 0.45rem;
}

.wallpack-calculator__input-wrap {
    align-items: center;
    background: #fff;
    border: 1px solid #cfc9c0;
    border-radius: 8px;
    display: flex;
    height: 60px;
    overflow: hidden;
    width: 100%;
}

.wallpack-calculator__input-wrap:focus-within {
    border-color: var(--wpc-accent-dark);
    box-shadow: 0 0 0 3px rgba(154, 113, 73, 0.18);
}

.wallpack-calculator .wallpack-calculator__input-wrap input[type="number"],
.wallpack-calculator .wallpack-calculator__input-wrap select {
    appearance: none;
    background-color: transparent !important;
    border: 0 !important;
    border-radius: 0 !important;
    box-shadow: none !important;
    color: var(--wpc-ink);
    font: inherit;
    font-weight: 650;
    height: 58px !important;
    line-height: 58px !important;
    margin: 0 !important;
    min-width: 0;
    outline: 0;
    padding: 0 0.9rem !important;
    vertical-align: middle;
    width: 100%;
}

.wallpack-calculator .wallpack-calculator__input-wrap input[type="number"] {
    -moz-appearance: textfield;
}

.wallpack-calculator .wallpack-calculator__input-wrap input[type="number"]::-webkit-inner-spin-button,
.wallpack-calculator .wallpack-calculator__input-wrap input[type="number"]::-webkit-outer-spin-button {
    appearance: none;
    margin: 0;
}

.wallpack-calculator .wallpack-calculator__input-wrap select {
    background-image: linear-gradient(45deg, transparent 50%, var(--wpc-muted) 50%), linear-gradient(135deg, var(--wpc-muted) 50%, transparent 50%);
    background-position: calc(100% - 18px) 27px, calc(100% - 13px) 27px;
    background-repeat: no-repeat;
    background-size: 5px 5px, 5px 5px;
    padding-right: 2.2rem !important;
}

.wallpack-calculator__input-wrap span {
    align-items: center;
    align-self: stretch;
    color: var(--wpc-muted);
    display: flex;
    line-height: 1;
    padding-right: 0.9rem;
}

.wallpack-calculator__button {
    background: var(--wpc-ink);
    border: 0;
    border-radius: 8px;
    color: #fff;
    cursor: pointer;
    font: inherit;
    font-weight: 700;
    height: 60px;
    line-height: 1.2;
    padding: 0.75rem 1.25rem;
    text-transform: none !important;
    transition: background-color 160ms ease, transform 160ms ease;
}

.wallpack-calculator__button:hover {
    background: var(--wpc-accent-dark);
}

.wallpack-calculator__button:focus-visible {
    outline: 3px solid rgba(154, 113, 73, 0.4);
    outline-offset: 3px;
}

.wallpack-calculator__button:active {
    transform: translateY(1px);
}

.wallpack-calculator__message {
    background: #fff5e7;
    border-left: 4px solid var(--wpc-accent);
    margin: 2rem clamp(1.25rem, 5vw, 4rem);
    padding: 1rem 1.2rem;
}

.wallpack-calculator__message strong {
    display: block;
    margin-bottom: 0.25rem;
}

.wallpack-calculator__message p {
    margin: 0;
}

.wallpack-calculator__results {
    padding: clamp(1.5rem, 4vw, 3rem) clamp(1.25rem, 5vw, 4rem);
}

.wallpack-calculator__summary {
    display: grid;
    gap: 1rem;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    margin-bottom: 2rem;
}

.wallpack-calculator__metric {
    border: 1px solid var(--wpc-line);
    border-radius: 12px;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    padding: 1.25rem;
}

.wallpack-calculator__metric > span {
    color: var(--wpc-muted);
    font-size: 0.86rem;
}

.wallpack-calculator__metric strong {
    font-size: clamp(2rem, 5vw, 3.25rem);
    line-height: 1;
}

.wallpack-calculator__metric small {
    font-size: 0.9rem;
}

.wallpack-calculator__metric--accent {
    background: var(--wpc-ink);
    border-color: var(--wpc-ink);
    color: #fff;
}

.wallpack-calculator__metric--accent > span {
    color: rgba(255, 255, 255, 0.72);
}

.wallpack-calculator__body {
    align-items: start;
    display: grid;
    gap: clamp(1.5rem, 4vw, 3rem);
    grid-template-columns: minmax(0, 1.45fr) minmax(260px, 0.75fr);
}

.wallpack-calculator__visual h3 {
    font-size: 1rem;
    margin: 0 0 0.75rem;
}

.wallpack-calculator__visual [data-visual] {
    background: #e8e3da;
    border: 1px solid var(--wpc-line);
    border-radius: 10px;
    overflow: hidden;
}

.wallpack-calculator__visual svg {
    display: block;
    height: clamp(250px, 38vw, 440px);
    width: 100%;
}

.wallpack-calculator__svg-rib {
    fill: #fdfcf9;
    filter: drop-shadow(1px 0 1px rgba(60, 52, 43, 0.28));
}

.wallpack-calculator__svg-joint {
    stroke: rgba(66, 57, 48, 0.35);
    stroke-width: 1;
}

.wallpack-calculator__visual-hint,
.wallpack-calculator__note,
.wallpack-calculator__cut-note {
    color: var(--wpc-muted);
    font-size: 0.82rem;
    line-height: 1.55;
}

.wallpack-calculator__details {
    margin: 1.75rem 0 0;
}

.wallpack-calculator__details > div {
    align-items: baseline;
    border-bottom: 1px solid var(--wpc-line);
    display: flex;
    gap: 1rem;
    justify-content: space-between;
    padding: 0.75rem 0;
}

.wallpack-calculator__details dt {
    color: var(--wpc-muted);
    font-size: 0.82rem;
}

.wallpack-calculator__details dd {
    font-weight: 700;
    margin: 0;
    text-align: right;
}

.wallpack-calculator__cut-note {
    background: var(--wpc-surface);
    border-radius: 8px;
    color: var(--wpc-ink);
    margin: 1.5rem 0 0;
    padding: 0.9rem 1rem;
}

.wallpack-calculator__note {
    margin: 1rem 0 0;
}

@media (max-width: 820px) {
    .wallpack-calculator__form {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .wallpack-calculator__button {
        grid-column: span 2;
    }

    .wallpack-calculator__body {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 520px) {
    .wallpack-calculator {
        border-left: 0;
        border-radius: 0;
        border-right: 0;
    }

    .wallpack-calculator__form,
    .wallpack-calculator__summary {
        grid-template-columns: 1fr;
    }

    .wallpack-calculator__button {
        grid-column: auto;
    }

    .wallpack-calculator__visual svg {
        height: 300px;
    }
}

@media (prefers-reduced-motion: reduce) {
    .wallpack-calculator__button {
        transition: none;
    }
}