.calculator-shell {
    width: min(1180px, calc(100% - 40px));
    margin: 44px auto 72px;
}

.calculator-shell,
.calculator-shell * {
    box-sizing: border-box;
    min-width: 0;
}

.calculator-hero,
.calculator-panel,
.calculator-result,
.calculator-card,
.calculator-error {
    border: 1px solid #d6dce3;
    background: #fff;
}

.calculator-hero {
    margin-bottom: 28px;
    padding: clamp(24px, 4vw, 44px);
    background: linear-gradient(135deg, #f5f9fd, #fff 72%);
}

.calculator-hero h1 {
    margin: 0 0 12px;
    font-size: clamp(2rem, 5vw, 3.7rem);
    line-height: 1.05;
    overflow-wrap: anywhere;
}

.calculator-hero p,
.calculator-info p {
    max-width: 900px;
}

.calculator-info {
    margin: 22px 0;
    padding: 18px 22px;
    border-left: 5px solid #1976b9;
    background: #edf7ff;
}

.calculator-grid,
.calculator-catalog {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 22px;
}

.calculator-panel,
.calculator-result,
.calculator-card {
    padding: 24px;
}

.calculator-card {
    --card-accent: #2563eb;
    --card-surface: #eff6ff;
    display: flex;
    flex-direction: column;
    border: 1px solid color-mix(in srgb, var(--card-accent) 38%, #d6dce3);
    border-top: 3px solid var(--card-accent);
    border-radius: 8px;
    background: linear-gradient(145deg, var(--card-surface), #fff 68%);
    transition: border-color .15s ease, box-shadow .15s ease, transform .15s ease;
}

.calculator-card:hover {
    border-color: var(--card-accent);
    box-shadow: 0 7px 20px rgba(27, 42, 56, .09);
    transform: translateY(-2px);
}

.calculator-card--balance {
    --card-accent: #0f766e;
    --card-surface: #f0fdfa;
}

.calculator-card--dynamics {
    --card-accent: #7c3aed;
    --card-surface: #f5f3ff;
}

.calculator-card--geometry {
    --card-accent: #a85408;
    --card-surface: #fffbeb;
}

.calculator-card--loads {
    --card-accent: #be123c;
    --card-surface: #fff1f2;
}

.calculator-card--measurement {
    --card-accent: #0e7490;
    --card-surface: #ecfeff;
}

.calculator-card--comparison {
    --card-accent: #15803d;
    --card-surface: #f0fdf4;
}

.calculator-panel h2,
.calculator-result h2,
.calculator-card h2 {
    margin-top: 0;
    line-height: 1.25;
}

.calculator-card h2 {
    margin-bottom: 0;
    font-size: clamp(1.08rem, 1.6vw, 1.28rem);
}

.calculator-card a {
    color: #17212b;
    text-decoration: none;
}

.calculator-card a:hover,
.calculator-card a:focus-visible {
    color: var(--card-accent);
}

.calculator-card a:focus-visible {
    outline: 2px solid var(--card-accent);
    outline-offset: 3px;
}

.calculator-card__kind {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 12px;
    color: var(--card-accent);
    font-size: .72rem;
    font-weight: 700;
    letter-spacing: .055em;
    line-height: 1.2;
    text-transform: uppercase;
}

.calculator-card__icon {
    display: inline-grid;
    width: 28px;
    height: 28px;
    flex: 0 0 28px;
    place-items: center;
    border-radius: 7px;
    background: var(--card-accent);
    color: #fff;
    font-size: .95rem;
    letter-spacing: 0;
}

.calculator-card__summary {
    margin: 10px 0 0;
    color: #263746;
    font-size: .94rem;
    font-weight: 500;
    line-height: 1.48;
}

.calculator-card__description {
    margin: 7px 0 0;
    color: #4e5d69;
    font-size: .9rem;
    line-height: 1.55;
}

.calculator-form-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 18px;
}

.calculator-field label {
    display: block;
    margin-bottom: 6px;
    font-weight: 700;
}

.calculator-field input {
    width: 100%;
    max-width: 100%;
    padding: 11px 12px;
    border: 1px solid #aeb8c2;
    border-radius: 3px;
    background: #fff;
    color: #111;
    font: inherit;
}

.calculator-field small {
    display: block;
    margin-top: 5px;
    color: #59636e;
    line-height: 1.4;
}

.calculator-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-top: 22px;
}

.calculator-button {
    display: inline-block;
    padding: 11px 18px;
    border: 1px solid #111;
    border-radius: 3px;
    background: #111;
    color: #fff;
    font: inherit;
    font-weight: 700;
    text-decoration: none;
    cursor: pointer;
}

.calculator-button--secondary {
    background: #fff;
    color: #111;
}

.calculator-results-table {
    width: 100%;
    border-collapse: collapse;
}

.calculator-results-table th,
.calculator-results-table td {
    padding: 10px 8px;
    border-bottom: 1px solid #e1e6eb;
    text-align: left;
    vertical-align: top;
}

.calculator-results-table th {
    width: 58%;
    color: #4d5863;
    font-weight: 500;
}

.calculator-equation {
    overflow-x: auto;
    padding: 14px 16px;
    background: #f5f7f9;
    font-family: "Courier New", monospace;
}

.calculator-warning {
    padding: 14px 16px;
    border-left: 5px solid #bd7a00;
    background: #fff7e6;
}

.calculator-chart {
    display: block;
    width: 100%;
    height: auto;
    margin-top: 18px;
    color: #48535e;
    font: 12px "Rubik", sans-serif;
}

.chart-grid { stroke: #dfe5ea; stroke-width: 1; }
.chart-axis { stroke: #5b6670; stroke-width: 1.5; }
.chart-series { fill: none; stroke: #1976b9; stroke-width: 3; stroke-linejoin: round; }
.chart-label { fill: #202830; font-weight: 700; }

.calculator-assumptions {
    margin-top: 28px;
    padding: 22px;
    border: 1px dashed #9aa6b1;
    background: #fafbfc;
}

.calculator-reference {
    margin-top: 28px;
    padding: 22px;
    border: 1px solid #9cb7a6;
    background: #f4fbf6;
}

.calculator-reference h2 {
    margin-top: 0;
}

.calculator-reference h3 {
    margin: 22px 0 10px;
}

.calculator-table-scroll {
    overflow-x: auto;
}

.calculator-reference-table {
    width: 100%;
    border-collapse: collapse;
}

.calculator-reference-table th,
.calculator-reference-table td {
    padding: 9px 10px;
    border: 1px solid #d4e3d8;
    text-align: left;
    vertical-align: top;
}

.calculator-reference-table thead th {
    background: #e7f4ea;
}

.calculator-reference-table tbody th {
    font-weight: 500;
}

@media (max-width: 760px) {
    .calculator-shell { width: min(100% - 24px, 1180px); margin-top: 24px; }
    .calculator-grid,
    .calculator-catalog,
    .calculator-form-grid { grid-template-columns: 1fr; }
    .calculator-hero { padding: 24px 20px; }
    .calculator-hero a,
    .calculator-info,
    .calculator-assumptions { overflow-wrap: anywhere; }
}

@media print {
    .site-header,
    .site-footer,
    .calculator-actions { display: none !important; }
    .calculator-shell { width: 100%; margin: 0; }
    .calculator-panel,
    .calculator-result,
    .calculator-hero { break-inside: avoid; }
}