:root {
    --navy: #0a2540;
    --blue: #1e5fff;
    --blue-light: #eaf0ff;
    --green: #16a34a;
    --gray-bg: #f4f6fa;
    --border: #e2e6ee;
    --text: #1a2233;
    --text-muted: #6b7488;
    --radius: 10px;
}

* { box-sizing: border-box; }

body {
    margin: 0;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Arial, sans-serif;
    background: var(--gray-bg);
    color: var(--text);
}

/* ───── Login ───── */
.login-body {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    background: linear-gradient(135deg, var(--navy), var(--blue));
}
.login-card {
    background: #fff;
    padding: 40px;
    border-radius: var(--radius);
    width: 340px;
    text-align: center;
    box-shadow: 0 20px 50px rgba(0,0,0,.25);
}
.login-logo { font-size: 36px; margin-bottom: 8px; }
.login-card h1 { font-size: 19px; margin: 0 0 24px; color: var(--navy); }
.login-form { text-align: left; display: flex; flex-direction: column; gap: 4px; }
.login-form label { font-size: 13px; font-weight: 600; margin-top: 10px; }
.login-form input {
    padding: 10px 12px; border: 1px solid var(--border); border-radius: 8px; font-size: 14px;
}
.login-form button {
    margin-top: 20px; padding: 12px; border: none; border-radius: 8px;
    background: var(--blue); color: #fff; font-weight: 600; font-size: 14px; cursor: pointer;
}
.login-form button:hover { background: #164fd9; }
.alert-error {
    background: #fde8e8; color: #b91c1c; padding: 10px; border-radius: 8px; font-size: 13px; margin-bottom: 10px;
}

/* ───── Topbar ───── */
.topbar {
    display: flex; align-items: center; justify-content: space-between;
    background: var(--navy); color: #fff; padding: 0 20px; height: 58px;
    position: sticky; top: 0; z-index: 10;
}
.topbar-left { display: flex; align-items: center; gap: 8px; font-weight: 700; }
.logo { font-size: 20px; }
.app-title { font-size: 15px; }
.tabs { display: flex; gap: 4px; }
.tab-btn {
    background: transparent; border: none; color: #b9c4dd; padding: 10px 16px;
    font-size: 13px; font-weight: 600; cursor: pointer; border-radius: 6px;
}
.tab-btn:hover { background: rgba(255,255,255,.08); color: #fff; }
.tab-btn.active { background: var(--blue); color: #fff; }
.topbar-right { display: flex; align-items: center; gap: 12px; }
.user-chip { font-size: 13px; color: #cfd8ec; }
.btn-logout {
    color: #fff; text-decoration: none; font-size: 13px; background: rgba(255,255,255,.1);
    padding: 6px 12px; border-radius: 6px;
}
.btn-logout:hover { background: rgba(255,255,255,.2); }

/* ───── Layout ───── */
.content { max-width: 1200px; margin: 0 auto; padding: 24px 20px 60px; }
.tab-content { display: none; }
.tab-content.active { display: block; }

.calc-grid { display: grid; grid-template-columns: 1.1fr .9fr; gap: 20px; align-items: start; }
@media (max-width: 900px) { .calc-grid { grid-template-columns: 1fr; } }

.calc-results { position: sticky; top: 78px; display: flex; flex-direction: column; gap: 16px; }

/* ───── Cards ───── */
.card {
    background: #fff; border: 1px solid var(--border); border-radius: var(--radius);
    padding: 20px; margin-bottom: 16px;
}
.card h2 { font-size: 15px; margin: 0 0 14px; color: var(--navy); display: flex; align-items: center; gap: 8px; }
.card-header-flex { display: flex; align-items: center; justify-content: space-between; margin-bottom: 14px; }
.card-header-flex h2 { margin: 0; }
.icon { font-size: 16px; }

label { display: block; font-size: 13px; font-weight: 600; margin: 12px 0 4px; color: var(--text); }
input[type="text"], input[type="number"], input[type="password"], select {
    width: 100%; padding: 9px 10px; border: 1px solid var(--border); border-radius: 8px;
    font-size: 14px; background: #fbfcfe;
}
input:focus, select:focus { outline: none; border-color: var(--blue); background: #fff; }
small { display: block; color: var(--text-muted); font-size: 11.5px; margin-top: 3px; }

.input-with-select { display: flex; gap: 8px; }
.input-with-select input { flex: 1.3; }
.input-with-select select { flex: 1; }

/* ───── Resultados ───── */
.result-card { display: flex; flex-direction: column; gap: 4px; }
.result-label { font-size: 12px; font-weight: 700; color: var(--text-muted); letter-spacing: .03em; }
.result-value { font-size: 26px; font-weight: 800; color: var(--navy); }
.result-card.highlight { background: var(--blue-light); border-color: var(--blue); }
.result-card.highlight .result-value { color: var(--blue); }

.result-row {
    display: flex; justify-content: space-between; align-items: center;
    padding: 8px 0; border-bottom: 1px solid var(--border); font-size: 13.5px;
}
.result-row:last-of-type { border-bottom: none; }
.result-row.profit strong { color: var(--green); font-size: 17px; }

.summary-card { background: var(--navy); color: #fff; }
.summary-card h2 { color: #fff; }
.summary-card .result-row { border-color: rgba(255,255,255,.15); }
.summary-card .result-row.profit strong { color: #4ade80; }
.summary-card small { color: #9fb0d1; }

/* ───── Botones ───── */
.btn-primary {
    background: var(--blue); color: #fff; border: none; padding: 11px 18px;
    border-radius: 8px; font-weight: 700; font-size: 14px; cursor: pointer;
}
.btn-primary:hover { background: #164fd9; }
.btn-secondary {
    background: #fff; color: var(--navy); border: 1px solid var(--border);
    padding: 8px 14px; border-radius: 8px; font-weight: 600; font-size: 13px; cursor: pointer;
}
.btn-secondary:hover { background: var(--gray-bg); }
.btn-sm { padding: 6px 12px; font-size: 12.5px; }
.btn-block { width: 100%; margin-top: 6px; }
#guardarMsg { text-align: center; font-size: 13px; margin-top: 8px; min-height: 18px; }
#guardarMsg.ok { color: var(--green); }
#guardarMsg.err { color: #b91c1c; }

/* ───── Tablas ───── */
.data-table { width: 100%; border-collapse: collapse; font-size: 13.5px; }
.data-table th, .data-table td { text-align: left; padding: 10px 8px; border-bottom: 1px solid var(--border); }
.data-table th { color: var(--text-muted); font-size: 11.5px; text-transform: uppercase; letter-spacing: .03em; }
.data-table td.actions { text-align: right; white-space: nowrap; }
.link-btn { background: none; border: none; color: var(--blue); cursor: pointer; font-size: 13px; font-weight: 600; padding: 2px 6px; }
.link-btn.danger { color: #b91c1c; }
.empty-row td { text-align: center; color: var(--text-muted); padding: 24px; }

/* ───── Modal ───── */
.modal-overlay {
    display: none; position: fixed; inset: 0; background: rgba(10,37,64,.5);
    align-items: center; justify-content: center; z-index: 100;
}
.modal-overlay.show { display: flex; }
.modal {
    background: #fff; border-radius: var(--radius); padding: 24px; width: 520px; max-width: 92vw;
    max-height: 88vh; overflow-y: auto;
}
.modal h2 { margin-top: 0; font-size: 16px; color: var(--navy); }
.modal-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 0 14px; }
.modal-actions { display: flex; justify-content: flex-end; gap: 10px; margin-top: 20px; }

/* ───── Instrucciones ───── */
.instrucciones-list { line-height: 1.8; font-size: 14px; }
.instrucciones-list li { margin-bottom: 6px; }

/* ───── Mi Empresa ───── */
.empresa-card { max-width: 640px; }
.empresa-grid { display: grid; grid-template-columns: 180px 1fr; gap: 24px; margin-top: 16px; }
@media (max-width: 600px) { .empresa-grid { grid-template-columns: 1fr; } }

.logo-uploader { display: flex; flex-direction: column; align-items: center; text-align: center; }
.logo-preview {
    width: 150px; height: 150px; border: 2px dashed var(--border); border-radius: 10px;
    display: flex; align-items: center; justify-content: center; background: var(--gray-bg);
    margin-bottom: 10px; overflow: hidden;
}
.logo-preview img { max-width: 100%; max-height: 100%; object-fit: contain; }
.logo-preview span { color: var(--text-muted); font-size: 12.5px; }
.logo-buttons { display: flex; gap: 8px; margin-bottom: 6px; }

.empresa-fields label:first-child { margin-top: 0; }
#empresaMsg { text-align: left; font-size: 13px; margin-top: 8px; min-height: 18px; }
#empresaMsg.ok { color: var(--green); }
#empresaMsg.err { color: #b91c1c; }