/* ==========================================================================
   1. VARIABLES Y CONFIGURACIÓN BASE (Identidad del Home)
   ========================================================================== */
:root {
    --primary-color: #0055ff;
    --text-color: #111111;
    --accent-color: #666666;
    --bg-color: #fafafa;
    --border-color: #eaeaea;
    --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

body {
    background-color: var(--bg-color);
    color: var(--text-color);
    font-family: var(--font-family);
    margin: 0;
    padding: 0;
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
}

.container {
    max-width: 1100px;
    margin: 4rem auto;
    padding: 0 2rem;
}

/* ==========================================================================
   2. NAVEGACIÓN (Navbar unificado y limpio)
   ========================================================================== */
nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.5rem 5%;
    border-bottom: 1px solid var(--border-color);
    background: #ffffff;
}

nav .logo a {
    font-weight: 700;
    letter-spacing: -0.03rem;
    text-decoration: none;
    color: var(--text-color);
}

nav ul {
    display: flex;
    list-style: none;
    gap: 2rem;
    margin: 0;
    padding: 0;
}

nav ul li a {
    text-decoration: none;
    color: var(--accent-color);
    font-size: 0.9rem;
    font-weight: 500;
    transition: color 0.15s ease;
}

nav ul li a:hover {
    color: var(--text-color);
}

/* ==========================================================================
   3. BOTONES Y COMPONENTES ESTÁNDAR
   ========================================================================== */
.btn {
    display: inline-block;
    background: var(--text-color);
    color: #ffffff;
    padding: 0.65rem 1.25rem;
    border-radius: 4px;
    text-decoration: none;
    font-size: 0.9rem;
    font-weight: 500;
    transition: background-color 0.15s ease;
    border: none;
    cursor: pointer;
}

.btn:hover {
    background: #333333;
}

/* Alertas de mensajes flash */
.alert {
    padding: 1rem;
    border-radius: 4px;
    margin-bottom: 1rem;
    font-size: 0.9rem;
    border: 1px solid transparent;
}
.alert-success { background: #e6f4ea; color: #137333; border-color: #ceead6; }
.alert-danger { background: #fce8e6; color: #c5221f; border-color: #fad2cf; }
.alert-info { background: #e8f0fe; color: #1a56db; border-color: #d2e3fc; }

/* ==========================================================================
   4. SECCIÓN DE AUTENTICACIÓN (Login / Register Moderno e Intuitivo)
   ========================================================================== */
.auth-container {
    display: flex;
    justify-content: center;
    align-items: center;
    margin-top: 3rem;
    margin-bottom: 3rem;
}

.auth-card {
    background: #ffffff;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    padding: 3rem 2.5rem;
    width: 100%;
    max-width: 480px;
    box-sizing: border-box;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.02), 0 1px 3px rgba(0, 0, 0, 0.01);
}

.auth-title {
    font-size: 1.75rem;
    font-weight: 700;
    margin-top: 0;
    margin-bottom: 0.5rem;
    letter-spacing: -0.04rem;
    color: var(--text-color);
}

.auth-subtitle {
    font-size: 0.95rem;
    color: var(--accent-color);
    margin-bottom: 2rem;
    line-height: 1.4;
}

.form-group {
    margin-bottom: 1.4rem;
    display: flex;
    flex-direction: column;
}

.form-label {
    font-size: 0.78rem;
    font-weight: 600;
    margin-bottom: 0.45rem;
    color: var(--text-color);
    text-transform: uppercase;
    letter-spacing: 0.06rem;
}

.form-control {
    background: #ffffff;
    border: 1px solid #d1d5db;
    border-radius: 4px;
    padding: 0.75rem 0.85rem;
    font-size: 0.95rem;
    font-family: var(--font-family);
    color: var(--text-color);
    width: 100%;
    box-sizing: border-box;
    transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.form-control:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(0, 85, 255, 0.08);
}

input[type="date"].form-control {
    font-family: var(--font-family);
    text-transform: uppercase;
    font-size: 0.85rem;
    letter-spacing: 0.02rem;
}

.form-row {
    display: flex;
    gap: 1.25rem;
    flex-wrap: wrap;
}

.form-row .form-group {
    flex: 1;
    min-width: 160px;
}

.form-options {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.9rem;
    margin-bottom: 1.75rem;
}

.checkbox-label {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    cursor: pointer;
    user-select: none;
}

.auth-link {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 500;
}

.auth-link:hover {
    text-decoration: underline;
}

.btn-submit {
    width: 100%;
    text-align: center;
    border: none;
    cursor: pointer;
    font-size: 0.95rem;
    font-weight: 600;
    padding: 0.85rem;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
    background: var(--text-color);
    color: #ffffff;
    border-radius: 4px;
    transition: background-color 0.2s ease, transform 0.1s ease;
}

.btn-submit:hover {
    background: #333333;
}

.btn-submit:active {
    transform: scale(0.99);
}

.auth-footer {
    text-align: center;
    margin-top: 2rem;
    padding-top: 1.5rem;
    border-top: 1px solid var(--border-color);
    font-size: 0.9rem;
    color: var(--accent-color);
}

.form-error {
    color: #c5221f;
    font-size: 0.8rem;
    margin-top: 0.4rem;
    font-weight: 500;
}

/* ==========================================================================
   5. DISEÑO RESPONSIVO (Media Queries)
   ========================================================================== */
@media (max-width: 768px) {
    nav {
        padding: 1.25rem 5%;
        flex-direction: column;
        gap: 1rem;
        text-align: center;
    }

    nav ul {
        gap: 1.5rem;
    }

    .container {
        margin: 2.5rem auto;
        padding: 0 1.5rem;
    }

    .form-row {
        flex-direction: column;
        gap: 0;
    }

    .auth-card {
        padding: 1.5rem;
    }
}

/* ==========================================================================
   6. MÓDULO DE NEGOCIOS (Registro contable + indicadores)
   Extiende la misma identidad visual de arriba: tarjetas blancas, bordes
   finos grises, radios de 4-6px, acento azul, tipografía del sistema.
   ========================================================================== */
:root {
    --surface-color: #ffffff;
    --radius-md: 6px;
    --shadow-card: 0 1px 3px rgba(0, 0, 0, 0.03), 0 1px 2px rgba(0, 0, 0, 0.02);
    --success-color: #137333;
    --danger-color: #c5221f;
    --muted-color: #9aa0a6;
}

.page-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    flex-wrap: wrap;
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.page-title {
    font-size: 1.6rem;
    font-weight: 700;
    letter-spacing: -0.03rem;
    margin: 0 0 0.35rem 0;
    color: var(--text-color);
}

.page-subtitle {
    color: var(--accent-color);
    font-size: 0.92rem;
    margin: 0;
}

.card {
    background: var(--surface-color);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-card);
    padding: 1.75rem;
    margin-bottom: 1.5rem;
}

.card-title {
    font-size: 1.05rem;
    font-weight: 700;
    margin: 0 0 1.1rem 0;
    color: var(--text-color);
}

.card-title-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 0.75rem;
    margin-bottom: 1.1rem;
}

.business-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
    gap: 1.25rem;
}

.business-card {
    background: var(--surface-color);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-card);
    padding: 1.5rem;
    text-decoration: none;
    color: inherit;
    display: block;
    transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

.business-card:hover {
    border-color: var(--primary-color);
    box-shadow: 0 2px 8px rgba(0, 85, 255, 0.08);
}

.business-card h3 {
    margin: 0 0 0.5rem 0;
    font-size: 1.1rem;
    color: var(--text-color);
}

.business-card p {
    margin: 0;
    font-size: 0.88rem;
    color: var(--accent-color);
    line-height: 1.45;
}

.empty-state {
    text-align: center;
    padding: 3.5rem 2rem;
    color: var(--accent-color);
    background: var(--surface-color);
    border: 1px dashed var(--border-color);
    border-radius: var(--radius-md);
}

.tabs {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
    border-bottom: 1px solid var(--border-color);
    margin-bottom: 1.5rem;
}

.tab-link {
    padding: 0.7rem 0.25rem;
    margin-right: 1.25rem;
    text-decoration: none;
    color: var(--accent-color);
    font-size: 0.9rem;
    font-weight: 600;
    border-bottom: 2px solid transparent;
    cursor: pointer;
    background: none;
    border-top: none;
    border-left: none;
    border-right: none;
}

.tab-link.active,
.tab-link:hover {
    color: var(--primary-color);
    border-bottom-color: var(--primary-color);
}

.tab-panel { display: none; }
.tab-panel.active { display: block; }

.kpi-category {
    margin-bottom: 0.5rem;
}

.kpi-category h4 {
    font-size: 0.78rem;
    text-transform: uppercase;
    letter-spacing: 0.06rem;
    color: var(--accent-color);
    margin: 1.5rem 0 0.75rem 0;
}

.kpi-category:first-child h4 {
    margin-top: 0;
}

.kpi-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
    gap: 0.9rem;
}

.kpi-tile {
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 0.9rem 1rem;
    background: #fbfbfc;
}

.kpi-tile .kpi-name {
    font-size: 0.78rem;
    color: var(--accent-color);
    margin-bottom: 0.3rem;
    line-height: 1.25;
}

.kpi-tile .kpi-value {
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--text-color);
}

.kpi-tile .kpi-value.na {
    color: var(--muted-color);
    font-weight: 500;
    font-size: 0.95rem;
}

.kpi-tile .kpi-formula {
    font-size: 0.72rem;
    color: var(--muted-color);
    margin-top: 0.35rem;
    line-height: 1.3;
}

table.data-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.88rem;
}

table.data-table th,
table.data-table td {
    text-align: left;
    padding: 0.65rem 0.5rem;
    border-bottom: 1px solid var(--border-color);
}

table.data-table th {
    color: var(--accent-color);
    font-size: 0.72rem;
    text-transform: uppercase;
    letter-spacing: 0.05rem;
    font-weight: 600;
}

.badge {
    display: inline-block;
    padding: 0.2rem 0.55rem;
    border-radius: 999px;
    font-size: 0.72rem;
    font-weight: 600;
}

.badge-activo { background: #e8f0fe; color: #1a56db; }
.badge-pasivo { background: #fce8e6; color: #c5221f; }
.badge-patrimonio { background: #f3e8fd; color: #7b3fc4; }
.badge-ingreso { background: #e6f4ea; color: #137333; }
.badge-costo { background: #fef7e0; color: #a15c00; }
.badge-gasto { background: #fef0e6; color: #b35c00; }

.btn-secondary {
    background: #ffffff;
    color: var(--text-color);
    border: 1px solid #d1d5db;
}

.btn-secondary:hover {
    background: #f5f5f5;
}

.btn-sm {
    padding: 0.4rem 0.75rem;
    font-size: 0.8rem;
}

.btn-link-delete {
    background: none;
    border: none;
    color: var(--danger-color);
    cursor: pointer;
    font-size: 0.8rem;
    padding: 0.25rem 0.4rem;
}

.inline-form {
    display: inline;
}

.period-select {
    max-width: 220px;
}

/* Resumen contable: cards de utilidad y tabla del Estado Financiero */
.profit-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.profit-card {
    background: var(--surface-color);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-card);
    padding: 1.25rem 1.4rem;
}

.profit-name {
    font-size: 0.78rem;
    color: var(--accent-color);
    text-transform: uppercase;
    letter-spacing: 0.05rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.profit-value-row {
    display: flex;
    align-items: baseline;
    gap: 0.55rem;
}

.profit-value { font-size: 1.55rem; font-weight: 700; }
.profit-value.positive { color: var(--success-color); }
.profit-value.negative { color: var(--danger-color); }
.profit-indicator { font-size: 1rem; font-weight: 700; }
.profit-indicator.positive { color: var(--success-color); }
.profit-indicator.negative { color: var(--danger-color); }

.amount-col {
    text-align: right;
    font-variant-numeric: tabular-nums;
    white-space: nowrap;
}

/* Encabezado de categoría (Ingresos, Costos, Gastos, Pasivo, Activo, Patrimonio):
   estilo de título de reporte financiero, no una etiqueta pequeña. */
tr.group-header td {
    padding: 1.6rem 0.5rem 0.65rem;
    border-bottom: 1.5px solid var(--text-color);
    font-size: 0.82rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.07rem;
    color: var(--text-color);
}
tr.group-header:first-child td { padding-top: 0; }

/* Total de categoría: discreto, sin fondo ni color llamativo */
tr.group-total td {
    font-weight: 600;
    color: var(--accent-color);
    background: transparent;
    border-top: 1px solid var(--border-color);
    border-bottom: 1px solid transparent;
    font-size: 0.85rem;
}
tr.group-total:last-child td { border-bottom: 1px solid var(--border-color); }

tr.account-row .row-remove {
    color: var(--muted-color);
    background: none;
    border: none;
    cursor: pointer;
    font-size: 0.9rem;
    padding: 0 0.35rem;
}
tr.account-row .row-remove:hover { color: var(--danger-color); }

.add-account-box {
    border: 1px dashed var(--border-color);
    border-radius: var(--radius-md);
    padding: 1rem 1.1rem;
    margin-bottom: 1.1rem;
    display: none;
    gap: 0.75rem;
    align-items: flex-end;
    flex-wrap: wrap;
}
.add-account-box.open { display: flex; }
.add-account-box .form-group { margin-bottom: 0; }

.stock-low { color: var(--danger-color); font-weight: 600; }
.stock-ok { color: var(--success-color); }

.totals-table { width: 100%; max-width: 320px; margin-left: auto; font-size: 0.88rem; border-collapse: collapse; }
.totals-table td { padding: 0.35rem 0.4rem; }
.totals-table tr.grand-total td { font-weight: 700; font-size: 1rem; border-top: 1.5px solid var(--text-color); padding-top: 0.6rem; }

.warn-banner {
    background: #fff4e5;
    color: #8a5300;
    border: 1px solid #f3dcb3;
    border-radius: var(--radius-md);
    padding: 0.85rem 1.1rem;
    font-size: 0.82rem;
    font-weight: 600;
    margin-bottom: 1.25rem;
}

@media (max-width: 768px) {
    .card { padding: 1.25rem; }
    .kpi-grid { grid-template-columns: 1fr 1fr; }
    .profit-grid { grid-template-columns: 1fr; }
    .tabs { gap: 0.25rem; }
    .tab-link { margin-right: 0.75rem; font-size: 0.85rem; }
}

@media (max-width: 480px) {
    .kpi-grid { grid-template-columns: 1fr; }
    .profit-value { font-size: 1.3rem; }
    .page-title { font-size: 1.35rem; }
    .totals-table { max-width: 100%; }
}