.calc-container {
    max-width: 1040px;
    margin: 0 auto;
    padding: 32px 24px 64px;
}

.calc-header {
    margin-bottom: 28px;
}

.calc-header h1 {
    font-size: 1.6em;
    margin-bottom: 8px;
    color: var(--text);
}

.calc-lede {
    color: var(--text-muted);
    font-size: 0.95em;
    max-width: 70ch;
    margin-bottom: 12px;
}

.calc-lede:last-child {
    margin-bottom: 0;
}

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

.calc-presets-label {
    display: block;
    font-size: 0.78em;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--text-muted);
    margin-bottom: 8px;
}

.calc-presets-row {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.preset-btn {
    font-family: inherit;
    font-size: 0.85rem;
    font-weight: 600;
    padding: 10px 18px;
    color: white;
    background: #00C853;
    border: 1px solid #00C853;
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.15s;
    white-space: nowrap;
    box-shadow: 0px 4px 8px 0px rgba(255, 255, 255, 0.2) inset;
}

.preset-btn:hover {
    background: #00E676;
    border-color: #00E676;
}

.preset-btn.active {
    color: var(--text);
    background: var(--card-bg);
    border: 1px solid var(--border);
    font-weight: 500;
    box-shadow: 0px -4px 8px 0px rgba(0, 0, 0, 0.06) inset;
    cursor: default;
}

.preset-btn:focus-visible {
    outline: 2px solid var(--primary);
    outline-offset: 2px;
}

.calc-grid {
    display: grid;
    grid-template-columns: minmax(280px, 360px) 1fr;
    gap: 24px;
    align-items: start;
}

.calc-inputs,
.calc-outputs {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 20px;
    box-shadow: var(--shadow);
}

.calc-inputs h2,
.calc-outputs h2 {
    font-size: 1.05em;
    font-weight: 600;
    color: var(--text);
    margin-bottom: 16px;
    border-bottom: 1px solid var(--border);
    padding-bottom: 8px;
}

.calc-field {
    display: block;
    margin-bottom: 14px;
}

.calc-label {
    display: block;
    font-size: 0.85em;
    font-weight: 600;
    color: var(--secondary);
    margin-bottom: 4px;
}

.calc-field select {
    width: 100%;
    padding: 8px 10px;
    font-size: 0.95em;
    border: 1px solid var(--border);
    border-radius: 4px;
    background: var(--card-bg);
    color: var(--text);
    font-family: inherit;
}

.calc-field select:focus {
    outline: 2px solid var(--primary);
    outline-offset: -1px;
    border-color: var(--primary);
}

.calc-hint {
    display: block;
    margin-top: 4px;
    color: var(--text-muted);
    font-size: 0.78em;
    line-height: 1.4;
}

.calc-toggle {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 0 0;
    border-top: 1px solid var(--border);
    margin-top: 14px;
}

.calc-toggle input {
    width: 18px;
    height: 18px;
    accent-color: var(--primary);
}

.calc-toggle .calc-label {
    margin-bottom: 0;
}

.calc-chips {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 10px;
    margin-bottom: 18px;
}

.chip {
    padding: 10px 12px;
    border-radius: 6px;
    border: 1px solid var(--border);
    background: var(--bg);
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.chip-label {
    font-size: 0.85em;
    color: var(--text-muted);
    white-space: nowrap;
}

.chip-val {
    font-family: 'Courier New', monospace;
    font-weight: 700;
    font-size: 0.85em;
    color: var(--text);
    white-space: nowrap;
}

.chip.ok {
    background: #e8f5e9;
    border-color: #a5d6a7;
}

.chip.ok .chip-val {
    color: #2e7d32;
}

.chip.warn {
    background: #fff3e0;
    border-color: #ffcc80;
}

.chip.warn .chip-val {
    color: #e65100;
}

.chip.bad {
    background: #ffebee;
    border-color: #ef9a9a;
}

.chip.bad .chip-val {
    color: #c62828;
}

.calc-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.92em;
}

.calc-table th,
.calc-table td {
    padding: 8px 10px;
    text-align: left;
    border-bottom: 1px solid var(--border);
}

.calc-table th {
    font-weight: 500;
    color: var(--secondary);
    width: 55%;
}

.calc-table td {
    font-family: 'Courier New', monospace;
    color: var(--text);
    text-align: right;
}

.calc-table tr.calc-total th,
.calc-table tr.calc-total td {
    font-weight: 700;
    color: var(--text);
    border-top: 2px solid var(--border);
    border-bottom: none;
    padding-top: 12px;
}

.calc-breakdown {
    margin-top: 16px;
}

.calc-breakdown summary {
    cursor: pointer;
    font-size: 0.85em;
    color: var(--primary);
    padding: 6px 0;
}

.calc-breakdown summary:hover {
    color: var(--primary-dark);
}

#certBreakdown {
    margin-top: 8px;
}

#certBreakdown th {
    width: auto;
    font-size: 0.85em;
}

#certBreakdown td {
    font-size: 0.85em;
}

.calc-explainer {
    margin-top: 40px;
    max-width: 72ch;
}

.calc-explainer h2 {
    font-size: 1.2em;
    margin-bottom: 14px;
    color: var(--text);
    border-bottom: 1px solid var(--border);
    padding-bottom: 8px;
}

.calc-explainer h3 {
    font-size: 0.98em;
    margin: 20px 0 6px;
    color: var(--text);
}

.calc-explainer p {
    color: var(--secondary);
    font-size: 0.92em;
    margin-bottom: 10px;
}

.calc-explainer ul {
    padding-left: 22px;
    color: var(--secondary);
    font-size: 0.9em;
}

.calc-explainer li {
    margin-bottom: 4px;
}

.calc-explainer code {
    font-family: 'Courier New', monospace;
    font-size: 0.88em;
    background: #f5f5f5;
    padding: 1px 5px;
    border-radius: 3px;
}

.calc-caveat {
    margin-top: 18px;
    padding: 12px 14px;
    background: #fafafa;
    border-left: 3px solid var(--primary);
    color: var(--text-muted);
    font-size: 0.88em !important;
}

.footer {
    border-top: 1px solid var(--border);
    padding: 20px 0;
    text-align: center;
    color: var(--text-muted);
    font-size: 0.85em;
    background: var(--card-bg);
}

.footer a {
    color: var(--text-muted);
}

@media (max-width: 768px) {
    .calc-container {
        padding: 20px 16px 48px;
    }

    .calc-header h1 {
        font-size: 1.3em;
    }

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

    .calc-chips {
        grid-template-columns: 1fr;
    }

    .calc-table th {
        width: 60%;
        font-size: 0.88em;
    }

    .calc-table td {
        font-size: 0.9em;
    }
}