/* ============================================
   Boiler Efficiency Calculation Page Styles
   ============================================ */

:root {
    --calc-bg: #f6f7f4;
    --calc-card: #ffffff;
    --calc-text: #1d2a1f;
    --calc-muted: #667085;
    --calc-brand: #f36f21;
    --calc-brand-2: #ff9a4d;
    --calc-brand-soft: #fff2e9;
    --calc-border: #dde5d8;
    --calc-shadow: 0 14px 34px rgba(26, 46, 30, 0.08);
    --calc-radius: 18px;
    --calc-warning-bg: #fff5ee;
}

.calc-wrap {
    max-width: 1180px;
    margin: 0 auto;
    padding: 40px 18px 60px;
}

.calc-back-link {
    display: inline-flex;
    align-items: center;
    color: var(--calc-brand);
    text-decoration: none;
    font-weight: 600;
    font-size: 14px;
    margin-bottom: 20px;
    transition: all 0.3s;
    padding: 8px 16px;
    background: #fff;
    border: 1px solid var(--calc-border);
    border-radius: 12px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.05);
}

.calc-back-link:hover {
    color: #fff;
    background: var(--calc-brand);
    border-color: var(--calc-brand);
    transform: translateX(-5px);
}

.calc-back-link svg {
    margin-right: 6px;
}

.hero-calc {
    background: linear-gradient(135deg, rgba(243, 111, 33, 0.06) 0%, rgba(255, 154, 77, 0.10) 100%);
    border: 1px solid var(--calc-border);
    border-radius: 24px;
    padding: 30px;
    margin-bottom: 25px;
    box-shadow: var(--calc-shadow);
}

.hero-calc h1 {
    margin: 0 0 10px;
    font-size: 32px;
    line-height: 1.15;
    color: var(--calc-brand);
    font-family: 'Poppins', sans-serif;
    font-weight: 800;
}

.hero-calc p {
    margin: 0;
    color: var(--calc-muted);
    font-size: 15px;
    line-height: 1.65;
    max-width: 900px;
}

.calc-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 25px;
}

.calc-card {
    background: var(--calc-card);
    border: 1px solid var(--calc-border);
    border-radius: var(--calc-radius);
    box-shadow: var(--calc-shadow);
    overflow: hidden;
    display: flex;
    flex-direction: column;
}

.calc-card-header {
    padding: 20px 25px;
    border-bottom: 1px solid var(--calc-border);
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    background: linear-gradient(180deg, #ffffff 0%, #fbfcfa 100%);
}

.calc-card-header h2 {
    margin: 0;
    font-size: 20px;
    color: var(--calc-brand);
    font-family: 'Poppins', sans-serif;
    font-weight: 700;
}

.calc-badge {
    font-size: 12px;
    padding: 7px 11px;
    border-radius: 999px;
    color: var(--calc-brand);
    background: var(--calc-brand-soft);
    white-space: nowrap;
    border: 1px solid #ffe8d7;
    font-weight: 600;
}

.calc-card-body {
    padding: 25px;
    flex-grow: 1;
}

.calc-field {
    margin-bottom: 20px;
}

.calc-field label {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 10px;
    margin-bottom: 8px;
    font-size: 14px;
    font-weight: 700;
    color: var(--calc-text);
}

.calc-mini {
    color: var(--calc-muted);
    font-size: 12px;
    font-weight: 500;
}

.calc-input-wrap {
    display: flex;
    align-items: center;
    border: 1px solid var(--calc-border);
    border-radius: 12px;
    overflow: hidden;
    background: #fff;
    transition: all 0.2s ease;
}

.calc-input-wrap:focus-within {
    border-color: var(--calc-brand-2);
    box-shadow: 0 0 0 4px rgba(243, 111, 33, 0.12);
}

.calc-input-wrap input,
.calc-input-wrap select {
    width: 100%;
    border: 0;
    outline: 0;
    padding: 13px 15px;
    font-size: 15px;
    background: transparent;
    color: var(--calc-text);
    appearance: none;
    -webkit-appearance: none;
    -moz-appearance: none;
}

.calc-unit {
    padding: 13px 15px;
    background: #f7faf5;
    color: var(--calc-muted);
    border-left: 1px solid var(--calc-border);
    font-size: 13px;
    min-width: 80px;
    text-align: center;
    font-weight: 600;
    flex-shrink: 0;
}

.calc-range-row {
    display: grid;
    grid-template-columns: 1fr auto;
    gap: 12px;
    align-items: center;
    margin-top: 10px;
}

input[type="range"] {
    width: 100%;
    accent-color: var(--calc-brand);
}

.calc-range-value {
    min-width: 75px;
    text-align: right;
    color: var(--calc-brand);
    font-size: 13px;
    font-weight: 700;
}

.calc-result-boxes {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 15px;
    margin-top: 25px;
}

.calc-result {
    border-radius: 16px;
    padding: 20px;
    border: 1px solid var(--calc-border);
    background: #fafcf8;
    min-height: 115px;
}

.calc-result.primary {
    background: linear-gradient(180deg, #fef6f1 0%, #ffffff 100%);
    border-color: #ffe8d7;
}

.calc-result.success {
    background: linear-gradient(180deg, #f3f8ee 0%, #ffffff 100%);
    border-color: #e5efdb;
}

.calc-result .label {
    color: var(--calc-muted);
    font-size: 13px;
    margin-bottom: 10px;
}

.calc-result .value {
    font-size: 28px;
    font-weight: 800;
    line-height: 1.1;
    letter-spacing: -0.02em;
    color: var(--calc-brand);
}

.calc-result .sub {
    margin-top: 6px;
    color: var(--calc-muted);
    font-size: 12px;
}

.calc-details {
    margin-top: 20px;
    border-top: 1px dashed var(--calc-border);
    padding-top: 20px;
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 12px 15px;
}

.calc-detail-item {
    background: #fff;
    border: 1px solid var(--calc-border);
    border-radius: 12px;
    padding: 12px;
}

.calc-detail-item .k {
    color: var(--calc-muted);
    font-size: 11px;
    margin-bottom: 5px;
    font-weight: 600;
    text-transform: uppercase;
}

.calc-detail-item .v {
    font-size: 14px;
    font-weight: 700;
    color: var(--calc-text);
}

.calc-note {
    margin-top: 30px;
    padding: 25px;
    background: var(--calc-warning-bg);
    border: 1px solid #ffe8d7;
    border-radius: 20px;
    color: var(--calc-brand);
    line-height: 1.7;
    font-size: 14px;
    box-shadow: var(--calc-shadow);
}

.calc-formula {
    margin-top: 12px;
    padding: 15px;
    background: rgba(255, 255, 255, 0.85);
    border-radius: 12px;
    font-family: 'Inter', monospace;
    color: var(--calc-brand);
    overflow-x: auto;
    border: 1px solid #ffe8d7;
    font-size: 13px;
}

.calc-footer-line {
    margin-top: 15px;
    color: var(--calc-muted);
    font-size: 12px;
}

@media (max-width: 991px) {
    .calc-grid,
    .calc-result-boxes,
    .calc-details {
        grid-template-columns: 1fr;
    }
}