/* ── Paint Calculator CSS ── */
.calculator-page {
    background: var(--color-off-white);
    min-height: 60vh;
    padding-block: var(--space-12);
}

.calculator-box {
    background: var(--color-white);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-2xl);
    overflow: hidden;
    box-shadow: var(--shadow-lg);
    max-width: 800px;
    margin-inline: auto;
}

.calculator-box__header {
    background: var(--color-navy);
    padding: var(--space-8) var(--space-8) var(--space-6);
    color: var(--color-white);
}

.calculator-box__title {
    font-size: var(--text-2xl);
    font-weight: var(--weight-extrabold);
    color: var(--color-white);
    margin-bottom: var(--space-2);
}

.calculator-box__subtitle {
    font-size: var(--text-sm);
    color: rgba(255,255,255,0.65);
    margin: 0;
}

.calculator-box__body {
    padding: var(--space-8);
}

.calc-grid {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
    gap: var(--space-5);
    margin-bottom: var(--space-6);
}

.calc-form-group {
    display: flex;
    flex-direction: column;
    gap: var(--space-2);
}

.calc-label {
    font-size: var(--text-sm);
    font-weight: var(--weight-semibold);
    color: var(--color-navy);
}

.calc-input {
    width: 100%;
    padding: 12px 14px;
    font-family: inherit;
    font-size: var(--text-base);
    color: var(--color-text);
    background: var(--color-white);
    border: 1.5px solid var(--color-border);
    border-radius: var(--radius-md);
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
    appearance: none;
    text-align: center;
}

.calc-input:focus {
    outline: none;
    border-color: var(--color-navy);
    box-shadow: 0 0 0 3px rgba(6,52,91,0.1);
}

.calc-input[type="number"] {
    -moz-appearance: textfield;
}

.calc-input[type="number"]::-webkit-inner-spin-button { display: none; }

.calc-section-title {
    font-size: var(--text-sm);
    font-weight: var(--weight-bold);
    color: var(--color-text-muted);
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: var(--space-4);
    padding-bottom: var(--space-3);
    border-bottom: 1px solid var(--color-border);
}

.calc-paint-types {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-3);
    margin-bottom: var(--space-6);
}

.calc-paint-type {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-4) var(--space-3);
    border: 2px solid var(--color-border);
    border-radius: var(--radius-lg);
    cursor: pointer;
    transition: all var(--transition-fast);
    text-align: center;
    position: relative;
}

.calc-paint-type input[type="radio"] {
    position: absolute;
    opacity: 0;
    pointer-events: none;
}

.calc-paint-type:has(input:checked),
.calc-paint-type.is-selected {
    border-color: var(--color-navy);
    background: rgba(6, 52, 91, 0.04);
}

.calc-paint-type__name {
    font-size: var(--text-sm);
    font-weight: var(--weight-bold);
    color: var(--color-navy);
}

.calc-paint-type__coverage {
    font-size: var(--text-xs);
    color: var(--color-text-muted);
    font-family: monospace;
}

.calc-submit-btn {
    width: 100%;
    padding: 16px;
    font-size: var(--text-md);
    font-family: inherit;
    font-weight: var(--weight-bold);
    background: var(--color-navy);
    color: var(--color-white);
    border: none;
    border-radius: var(--radius-lg);
    cursor: pointer;
    transition: all var(--transition-base);
}

.calc-submit-btn:hover {
    background: var(--color-navy-dark);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

/* Results */
.calc-results {
    display: none;
    background: var(--color-off-white);
    border-top: 2px solid var(--color-gold);
    padding: var(--space-8);
    animation: slideDown 0.3s ease;
}

.calc-results.is-visible { display: block; }

@keyframes slideDown {
    from { opacity: 0; transform: translateY(-10px); }
    to   { opacity: 1; transform: translateY(0); }
}

.calc-results__title {
    font-size: var(--text-xl);
    font-weight: var(--weight-bold);
    color: var(--color-navy);
    margin-bottom: var(--space-6);
    display: flex;
    align-items: center;
    gap: var(--space-3);
}

.calc-results__title::before {
    content: '🎨';
}

.calc-results-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-4);
    margin-bottom: var(--space-6);
}

.calc-result-item {
    background: var(--color-white);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--space-5);
    text-align: center;
}

.calc-result-item--primary {
    border-color: var(--color-navy);
    border-width: 2px;
    background: rgba(6,52,91,0.03);
}

.calc-result-item__value {
    font-size: var(--text-3xl);
    font-weight: var(--weight-black);
    color: var(--color-navy);
    line-height: 1;
    margin-bottom: var(--space-2);
}

.calc-result-item--primary .calc-result-item__value {
    color: var(--color-gold);
    font-size: var(--text-4xl);
}

.calc-result-item__unit {
    font-size: var(--text-sm);
    font-weight: var(--weight-medium);
    color: var(--color-navy);
}

.calc-result-item__label {
    font-size: var(--text-xs);
    color: var(--color-text-muted);
    margin-top: var(--space-2);
    line-height: 1.5;
}

.calc-results__wa-btn {
    width: 100%;
    padding: 14px;
    font-size: var(--text-base);
    font-family: inherit;
    font-weight: var(--weight-bold);
    background: var(--color-whatsapp);
    color: var(--color-white);
    border: none;
    border-radius: var(--radius-lg);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-3);
    transition: all var(--transition-base);
    text-decoration: none;
}

.calc-results__wa-btn:hover {
    background: #1DA851;
    color: var(--color-white);
    transform: translateY(-1px);
    box-shadow: 0 4px 16px rgba(37,211,102,0.4);
}

@media (max-width: 768px) {
    .calc-grid { grid-template-columns: 1fr 1fr; }
    .calc-paint-types { grid-template-columns: 1fr 1fr; }
    .calc-results-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 480px) {
    .calc-grid { grid-template-columns: 1fr; }
    .calc-paint-types { grid-template-columns: 1fr; }
    .calc-results-grid { grid-template-columns: 1fr; }
    .calculator-box__body { padding: var(--space-5); }
    .calc-results { padding: var(--space-5); }
}