:root {
    color-scheme: light;
    --bg: #f6f8fb;
    --panel: #ffffff;
    --text: #172033;
    --muted: #617087;
    --line: #d9e1ee;
    --accent: #2563eb;
    --accent-dark: #1d4ed8;
    --soft: #edf4ff;
    --warn: #fff7ed;
    --ok: #ecfdf5;
    --shadow: 0 16px 42px rgba(30, 41, 59, 0.08);
}

* {
    box-sizing: border-box;
}

html {
    min-width: 0;
    overflow-x: hidden;
}

body.calc-lab {
    margin: 0;
    background: var(--bg);
    color: var(--text);
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    line-height: 1.75;
    overflow-x: hidden;
}

button,
input,
select,
textarea {
    font: inherit;
}

a {
    color: var(--accent-dark);
}

.calc-shell {
    width: min(1120px, calc(100% - 32px));
    margin: 0 auto;
    padding: 32px 0 42px;
}

.calc-hero {
    padding: 28px 0 18px;
}

.calc-kicker,
.section-kicker,
.ad-label {
    margin: 0 0 8px;
    color: var(--accent-dark);
    font-size: 0.78rem;
    font-weight: 800;
    letter-spacing: 0.08em;
}

.calc-hero h1 {
    margin: 0;
    font-size: clamp(2rem, 5vw, 3.6rem);
    line-height: 1.14;
    letter-spacing: 0;
}

.calc-lead {
    max-width: 780px;
    margin: 14px 0 0;
    color: #334155;
    font-size: 1.04rem;
}

.privacy-note,
.calc-note {
    display: inline-block;
    margin: 14px 0 0;
    padding: 9px 12px;
    border: 1px solid #bfdbfe;
    border-radius: 8px;
    background: var(--soft);
    color: #1e3a8a;
    font-size: 0.94rem;
}

.calc-grid {
    display: grid;
    grid-template-columns: minmax(0, 1.12fr) minmax(300px, 0.88fr);
    gap: 18px;
    align-items: start;
}

.calc-panel,
.calc-card,
.calc-series,
.calc-comments,
.ad-row {
    border: 1px solid var(--line);
    border-radius: 12px;
    background: var(--panel);
    box-shadow: var(--shadow);
}

.calc-panel,
.calc-card,
.calc-series,
.calc-comments {
    padding: 18px;
}

.calc-form {
    display: grid;
    gap: 14px;
}

.field-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 12px;
}

.field {
    display: grid;
    gap: 7px;
}

.field label {
    color: var(--muted);
    font-weight: 800;
    font-size: 0.88rem;
}

.field input,
.field select {
    width: 100%;
    min-height: 48px;
    border: 1px solid #cbd5e1;
    border-radius: 9px;
    background: #fff;
    color: var(--text);
    padding: 11px 12px;
}

.custom-tax-field[hidden] {
    display: none;
}

.toggle-line {
    display: flex;
    gap: 8px;
    align-items: center;
    color: var(--muted);
    font-weight: 700;
}

.toggle-line input {
    width: 20px;
    height: 20px;
}

.calc-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

.calc-actions button,
.quick-buttons button {
    min-height: 44px;
    border: 1px solid #cbd5e1;
    border-radius: 9px;
    background: #fff;
    color: var(--text);
    cursor: pointer;
    font-weight: 800;
    padding: 9px 13px;
    touch-action: manipulation;
}

.calc-actions .primary {
    border-color: var(--accent);
    background: var(--accent);
    color: #fff;
}

.calc-actions .secondary {
    background: var(--warn);
    color: #9a3412;
}

.result-board {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 12px;
    margin-top: 16px;
}

.result-card {
    min-height: 92px;
    border: 1px solid #dbeafe;
    border-radius: 10px;
    background: #f8fbff;
    padding: 14px;
}

.result-card span {
    display: block;
    color: var(--muted);
    font-size: 0.78rem;
    font-weight: 800;
}

.result-card strong {
    display: block;
    margin-top: 6px;
    color: #0f172a;
    font-size: clamp(1.45rem, 4.8vw, 2.6rem);
    overflow-wrap: anywhere;
}

.summary-box {
    margin-top: 14px;
    border: 1px solid #bbf7d0;
    border-radius: 10px;
    background: var(--ok);
    padding: 11px 12px;
    color: #14532d;
    font-weight: 700;
}

.calc-card {
    margin-bottom: 16px;
}

.calc-card h2,
.calc-panel h2,
.calc-series h2 {
    margin-top: 0;
    font-size: 1.22rem;
    letter-spacing: 0;
}

.calc-card p {
    color: #475569;
}

.calc-card ol,
.calc-card ul {
    padding-left: 1.2em;
}

.ad-row {
    margin: 20px 0;
    padding: 14px;
    min-height: 250px;
}

.calc-series {
    margin-top: 18px;
}

.series-links {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

.series-links a {
    display: inline-flex;
    max-width: 100%;
    padding: 8px 10px;
    border: 1px solid #cbd5e1;
    border-radius: 8px;
    background: #f8fafc;
    color: var(--accent-dark);
    text-decoration: none;
    overflow-wrap: anywhere;
}

.calc-comments {
    margin-top: 18px;
}

.return-links {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 12px;
    margin-top: 18px;
}

.return-links a {
    display: block;
    border: 1px solid var(--line);
    border-radius: 10px;
    background: #fff;
    color: var(--text);
    text-decoration: none;
    padding: 14px;
}

.return-links strong,
.return-links span,
.return-links small {
    display: block;
}

.return-links span {
    color: var(--accent-dark);
    font-weight: 800;
}

.return-links small {
    color: var(--muted);
}

.calc-footer {
    margin-top: 24px;
    color: var(--muted);
    font-size: 0.88rem;
    text-align: center;
}

@media (max-width: 820px) {
    .calc-shell {
        width: min(100% - 20px, 1120px);
        padding-top: 18px;
    }

    .calc-grid,
    .field-grid,
    .result-board,
    .return-links {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 420px) {
    .calc-panel,
    .calc-card,
    .calc-series,
    .calc-comments {
        padding: 14px;
    }

    .calc-actions button {
        flex: 1 1 130px;
    }
}