:root {
    --bg: #0f1419;
    --card: #1a2029;
    --card-2: #242c37;
    --border: #2e3845;
    --fg: #e6edf3;
    --muted: #8b949e;
    --accent: #58a6ff;
    --ok: #3fb950;
    --warn: #d29922;
    --bad: #f85149;
    --brand: #ff9f43;
}

* { box-sizing: border-box; }

body {
    margin: 0;
    background: var(--bg);
    color: var(--fg);
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", system-ui, sans-serif;
    font-size: 14px;
    line-height: 1.5;
}

header {
    background: linear-gradient(135deg, #1a2029 0%, #242c37 100%);
    padding: 14px 28px;
    border-bottom: 1px solid var(--border);
    display: flex;
    align-items: center;
    gap: 20px;
}

header h1 {
    margin: 0;
    font-size: 18px;
    color: var(--brand);
}

header nav a {
    color: var(--muted);
    text-decoration: none;
    margin-right: 16px;
    font-size: 13px;
}

header nav a.active, header nav a:hover {
    color: var(--fg);
}

main {
    max-width: 1400px;
    margin: 0 auto;
    padding: 24px;
    display: grid;
    grid-template-columns: 380px 1fr;
    gap: 24px;
}

.card {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 18px;
    margin-bottom: 16px;
}

.card h2 {
    margin: 0 0 14px;
    font-size: 14px;
    color: var(--brand);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.card h3 {
    margin: 16px 0 8px;
    font-size: 13px;
    color: var(--muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

label {
    display: block;
    font-size: 12px;
    color: var(--muted);
    margin: 10px 0 4px;
}

input, select {
    width: 100%;
    padding: 8px 10px;
    background: var(--card-2);
    border: 1px solid var(--border);
    border-radius: 6px;
    color: var(--fg);
    font-size: 13px;
    font-family: inherit;
}

input:focus, select:focus {
    outline: none;
    border-color: var(--accent);
}

.row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 10px;
}

.row-3 {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
    gap: 10px;
}

.checkbox-row {
    display: flex;
    align-items: center;
    gap: 8px;
    margin: 8px 0;
}

.checkbox-row input {
    width: auto;
}

.checkbox-row label {
    margin: 0;
    font-size: 12px;
}

button {
    width: 100%;
    padding: 12px 18px;
    background: var(--brand);
    color: #1a1a1a;
    border: none;
    border-radius: 8px;
    font-weight: 600;
    font-size: 14px;
    cursor: pointer;
    margin-top: 16px;
}

button:hover { background: #ffb263; }
button:disabled { opacity: 0.5; cursor: not-allowed; }

.scenarios {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
    gap: 12px;
    margin-bottom: 16px;
}

.scenario {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 14px;
}

.scenario.pessimista { border-top: 3px solid var(--bad); }
.scenario.realista   { border-top: 3px solid var(--brand); }
.scenario.otimista   { border-top: 3px solid var(--ok); }

.scenario h4 {
    margin: 0 0 10px;
    font-size: 12px;
    color: var(--muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.kpi { font-size: 22px; font-weight: 700; margin-bottom: 4px; }
.kpi.positive { color: var(--ok); }
.kpi.negative { color: var(--bad); }

.kpi-label { font-size: 11px; color: var(--muted); text-transform: uppercase; }

.mini-row {
    display: flex; justify-content: space-between;
    font-size: 12px; padding: 3px 0;
    color: var(--muted);
}
.mini-row strong { color: var(--fg); }

table {
    width: 100%;
    border-collapse: collapse;
    font-size: 12px;
}

table th, table td {
    text-align: left;
    padding: 6px 8px;
    border-bottom: 1px solid var(--border);
}

table th { color: var(--muted); font-weight: 500; }

.alert {
    padding: 8px 12px;
    border-radius: 6px;
    margin: 6px 0;
    font-size: 12px;
}
.alert.warn { background: rgba(210, 153, 34, 0.12); border-left: 3px solid var(--warn); }
.alert.bad  { background: rgba(248, 81, 73, 0.12);  border-left: 3px solid var(--bad); }

.tabs {
    display: flex;
    gap: 4px;
    margin-bottom: 12px;
    border-bottom: 1px solid var(--border);
}
.tab {
    padding: 8px 14px; background: transparent; border: none;
    color: var(--muted); cursor: pointer; font-size: 13px;
    border-bottom: 2px solid transparent; margin: 0; width: auto;
}
.tab.active { color: var(--brand); border-bottom-color: var(--brand); }

canvas { max-width: 100%; }

.empty {
    text-align: center;
    padding: 80px 20px;
    color: var(--muted);
    font-size: 14px;
}

@media (max-width: 900px) {
    main { grid-template-columns: 1fr; }
    .scenarios { grid-template-columns: 1fr; }
}