/* ===== Layout calculadora ===== */
.calc-layout {
    display: grid;
    grid-template-columns: 420px 1fr;
    gap: 2rem;
    align-items: start;
}
@media (max-width: 900px) {
    .calc-layout { grid-template-columns: 1fr; }
}

/* ===== Secciones del formulario ===== */
.form-section {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: 1.25rem;
    margin-bottom: 1rem;
    box-shadow: var(--shadow);
}
.section-title {
    font-size: .85rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: .05em;
    color: var(--color-muted);
    margin-bottom: 1rem;
}

/* ===== Parámetros avanzados ===== */
.params-toggle {
    width: 100%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: none;
    border: none;
    font-size: .9rem;
    font-weight: 600;
    color: var(--color-primary);
    cursor: pointer;
    padding: 0;
}
.params-toggle:hover { color: var(--color-primary-h); }
.toggle-icon { font-size: .8rem; transition: transform .2s; }
.params-hint {
    font-size: .8rem;
    color: var(--color-muted);
    margin: .5rem 0 .75rem;
}
.params-panel { margin-top: 1rem; }

.btn-lg { padding: .65rem 1.5rem; font-size: 1rem; width: 100%; justify-content: center; }

/* ===== Resultados ===== */
.calc-results-col { min-width: 0; }

.results-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 1.25rem;
    gap: 1rem;
    flex-wrap: wrap;
}
.results-header h2 { font-size: 1.2rem; }

/* ===== Tabs ===== */
.scenario-tabs {
    display: flex;
    gap: .5rem;
    margin-bottom: 1rem;
    border-bottom: 2px solid var(--color-border);
    padding-bottom: .5rem;
}
.tab-btn {
    background: none;
    border: none;
    font-size: .9rem;
    font-weight: 500;
    color: var(--color-muted);
    cursor: pointer;
    padding: .4rem .8rem;
    border-radius: var(--radius) var(--radius) 0 0;
    transition: color .15s, background .15s;
}
.tab-btn:hover  { color: var(--color-primary); }
.tab-btn.active {
    color: var(--color-primary);
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-bottom: 2px solid var(--color-surface);
    margin-bottom: -2px;
}

/* ===== Tarjeta de escenario ===== */
.scenario-card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: var(--shadow);
}

/* ===== Banner de viabilidad ===== */
.viability-banner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: .5rem;
    padding: .85rem 1.25rem;
    border-bottom: 2px solid;
    font-size: .95rem;
    font-weight: 600;
}
.viab-desc {
    font-size: .82rem;
    font-weight: 400;
    opacity: .85;
}

/* ===== KPIs ===== */
.kpi-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    border-bottom: 1px solid var(--color-border);
}
@media (max-width: 600px) { .kpi-grid { grid-template-columns: 1fr 1fr; } }

.kpi {
    padding: 1rem;
    text-align: center;
    border-right: 1px solid var(--color-border);
}
.kpi:last-child { border-right: none; }
.kpi-label { font-size: .75rem; color: var(--color-muted); margin-bottom: .25rem; }
.kpi-value { font-size: 1.25rem; font-weight: 700; }

/* ===== Desglose ===== */
.breakdown { padding: 1rem 1.25rem; }

.breakdown-details summary {
    font-size: .85rem;
    font-weight: 600;
    color: var(--color-primary);
    cursor: pointer;
    list-style: none;
    margin-bottom: .75rem;
}
.breakdown-details summary::-webkit-details-marker { display: none; }
.breakdown-details summary::before { content: '▸ '; }
.breakdown-details[open] summary::before { content: '▾ '; }

.breakdown-table {
    width: 100%;
    border-collapse: collapse;
    font-size: .875rem;
}
.breakdown-table th {
    text-align: left;
    padding: .35rem .5rem;
    font-size: .75rem;
    font-weight: 600;
    color: var(--color-muted);
    border-bottom: 2px solid var(--color-border);
}
.breakdown-table td {
    padding: .35rem .5rem;
    border-bottom: 1px solid var(--color-border);
}
.breakdown-table td:last-child { text-align: right; font-variant-numeric: tabular-nums; }
.breakdown-table .row-total td { font-weight: 700; background: var(--color-bg); }

.cell-cost { color: var(--color-danger); }
.cell-pos  { color: var(--color-success); }
.cell-neg  { color: var(--color-danger); }