:root {
    --bg-primary: #0f172a;
    --bg-secondary: #1e293b;
    --bg-card: rgba(30, 41, 59, 0.7);
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --accent-primary: #3b82f6;
    --accent-hover: #2563eb;
    --positive: #10b981;
    --negative: #ef4444;
    --neutral: #eab308;
    --border-color: rgba(255, 255, 255, 0.1);
    --glass-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.37);
    --glass-blur: blur(12px);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Inter', sans-serif;
}

body {
    background-color: var(--bg-primary);
    color: var(--text-primary);
    min-height: 100vh;
    display: flex;
    overflow-x: hidden;
}

/* Utilities */
.hidden { display: none !important; }
.active { display: flex !important; }
.mt-2 { margin-top: 1rem; }
.mt-4 { margin-top: 2rem; }
.w-100 { width: 100%; }
.positive { color: var(--positive) !important; }
.negative { color: var(--negative) !important; }
.neutral { color: var(--neutral) !important; }

/* typography */
h1, h2, h3 { font-weight: 600; }

/* Botones */
.btn-primary, .btn-secondary {
    padding: 0.6rem 1.2rem;
    border: none;
    border-radius: 8px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
}

.btn-primary {
    background-color: var(--accent-primary);
    color: white;
}

.btn-primary:hover {
    background-color: var(--accent-hover);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(59, 130, 246, 0.4);
}

.btn-secondary {
    background-color: transparent;
    border: 1px solid var(--border-color);
    color: var(--text-primary);
}

.btn-secondary:hover {
    background-color: rgba(255, 255, 255, 0.05);
}

.btn-icon {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    font-size: 1.2rem;
    transition: color 0.2s;
}
.btn-icon:hover { color: var(--text-primary); }
.btn-delete { color: var(--negative); background: transparent; border: none; cursor: pointer; padding: 0.4rem; border-radius: 4px;}
.btn-delete:hover { background: rgba(239, 68, 68, 0.1); }

/* Inputs */
.input-group {
    display: flex;
    flex-direction: column;
    margin-bottom: 1.2rem;
    width: 100%;
}

.input-group label {
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-bottom: 0.4rem;
}

input, select {
    background-color: rgba(15, 23, 42, 0.6);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    padding: 0.8rem;
    border-radius: 8px;
    font-size: 1rem;
    transition: border-color 0.3s;
    outline: none;
}

input:focus, select:focus {
    border-color: var(--accent-primary);
}

.input-date {
    padding: 0.5rem 0.8rem;
    color-scheme: dark;
}

/* Pantallas */
.screen {
    width: 100vw;
    height: 100vh;
}

/* Login Screen */
#login-screen {
    align-items: center;
    justify-content: center;
    background: radial-gradient(circle at top right, #1e3a8a, var(--bg-primary));
}

.login-container {
    background: var(--bg-card);
    backdrop-filter: var(--glass-blur);
    border: 1px solid var(--border-color);
    padding: 3rem;
    border-radius: 16px;
    width: 100%;
    max-width: 400px;
    box-shadow: var(--glass-shadow);
    animation: fadeIn 0.5s ease;
}

.login-container .logo {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.8rem;
    font-size: 1.5rem;
    margin-bottom: 2rem;
    color: var(--accent-primary);
}

.error-msg {
    color: var(--negative);
    font-size: 0.85rem;
    margin-bottom: 1rem;
    text-align: center;
    background: rgba(239, 68, 68, 0.1);
    padding: 0.5rem;
    border-radius: 4px;
}

/* Dashboard Layout */
#dashboard-screen {
    display: flex;
}

.sidebar {
    width: 250px;
    background-color: var(--bg-secondary);
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    padding: 2rem 1.5rem;
}

.sidebar .logo {
    display: flex;
    align-items: center;
    gap: 0.8rem;
    font-size: 1.2rem;
    margin-bottom: 3rem;
    color: var(--accent-primary);
}

.sidebar nav {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    flex: 1;
}

.nav-item {
    text-decoration: none;
    color: var(--text-secondary);
    padding: 0.8rem 1rem;
    border-radius: 8px;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    gap: 0.8rem;
    font-weight: 500;
}

.nav-item:hover {
    background-color: rgba(255, 255, 255, 0.05);
    color: var(--text-primary);
}

.nav-item.active {
    background-color: rgba(59, 130, 246, 0.15);
    color: var(--accent-primary);
}

/* Grupo colapsable de navegación */
.nav-group { display: flex; flex-direction: column; }
.nav-group-toggle { cursor: pointer; }
.nav-group-toggle .nav-chevron {
    margin-left: auto;
    font-size: 0.75rem;
    transition: transform 0.2s ease;
}
.nav-group.open > .nav-group-toggle .nav-chevron { transform: rotate(180deg); }
.nav-submenu {
    display: none;
    flex-direction: column;
    gap: 0.25rem;
    padding-left: 0.5rem;
    margin-top: 0.25rem;
    border-left: 2px solid var(--border-color);
    margin-left: 1rem;
}
.nav-group.open > .nav-submenu { display: flex; }
.nav-subitem {
    font-size: 0.9rem;
    padding: 0.5rem 0.8rem;
}

.user-info {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: 1.5rem;
    border-top: 1px solid var(--border-color);
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.main-content {
    flex: 1;
    padding: 2.5rem;
    overflow-y: auto;
}

.panel {
    display: none;
    flex-direction: column;
    animation: fadeIn 0.4s ease;
}

.panel header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
}

/* Tarjetas y Estadísticas */
.cards-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
}

.card {
    background: var(--bg-card);
    backdrop-filter: var(--glass-blur);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 1.5rem;
    box-shadow: var(--glass-shadow);
}

.stat-card {
    display: flex;
    align-items: center;
    gap: 1.5rem;
    transition: transform 0.3s ease;
}

.stat-card:hover {
    transform: translateY(-5px);
}

.icon-box {
    width: 50px;
    height: 50px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
}

.icon-box.income { background: rgba(16, 185, 129, 0.15); color: var(--positive); }
.icon-box.expense { background: rgba(239, 68, 68, 0.15); color: var(--negative); }
.icon-box.net { background: rgba(59, 130, 246, 0.15); color: var(--accent-primary); }

.stat-info h3 {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-bottom: 0.3rem;
}

.stat-info .value {
    font-size: 1.8rem;
    font-weight: 700;
}

/* Tools Bar */
.tools-bar {
    display: flex;
    gap: 1.5rem;
    align-items: center;
    margin-bottom: 1.5rem;
    background: var(--bg-secondary);
    padding: 1rem;
    border-radius: 12px;
}

.filter-group {
    display: flex;
    align-items: center;
    gap: 0.8rem;
}

.report-flex {
    display: flex;
    justify-content: space-around;
    align-items: center;
    font-size: 1.2rem;
}
.report-flex .label { color: var(--text-secondary); font-size: 0.9rem; display: block; margin-bottom: 0.5rem;}
.report-flex div { text-align: center; }

/* Tablas */
.table-container {
    overflow-x: auto;
    padding: 0;
}

/* Drill-down: filas de categoría expandibles */
.table-drilldown tr.cat-row { cursor: pointer; transition: background 0.15s ease; }
.table-drilldown tr.cat-row:hover { background: rgba(59, 130, 246, 0.08); }
.table-drilldown tr.cat-row td:first-child { color: var(--text-secondary); width: 30px; }
.table-drilldown tr.cat-row .chevron { transition: transform 0.2s ease; display: inline-block; }
.table-drilldown tr.cat-row.open .chevron { transform: rotate(90deg); color: var(--accent-primary); }
.table-drilldown tr.cat-row.open { background: rgba(59, 130, 246, 0.12); }
.table-drilldown tr.cat-children { display: none; }
.table-drilldown tr.cat-children.open { display: table-row; }
.table-drilldown tr.cat-children td { padding: 0; background: rgba(0,0,0,0.15); }
.table-drilldown .nested {
    margin: 0;
    padding: 0.5rem 1rem 0.5rem 2.5rem;
    width: 100%;
    border-collapse: collapse;
}
.table-drilldown .nested th,
.table-drilldown .nested td {
    padding: 0.5rem 0.8rem;
    font-size: 1rem;
    text-align: left;
    border-bottom: 1px solid rgba(255,255,255,0.05);
}
.table-drilldown .nested th {
    color: var(--text-secondary);
    font-weight: 500;
    text-transform: none;
    letter-spacing: 0;
}
.table-drilldown .nested tr:last-child td { border-bottom: none; }

table {
    width: 100%;
    border-collapse: collapse;
}

th, td {
    padding: 1rem 1.5rem;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}

th {
    color: var(--text-secondary);
    font-weight: 500;
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    background: rgba(0,0,0,0.1);
}

tbody tr {
    transition: background-color 0.2s;
}

tbody tr:hover {
    background-color: rgba(255, 255, 255, 0.03);
}

.badge {
    padding: 0.3rem 0.6rem;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 500;
}

.badge.ingreso { background: rgba(16, 185, 129, 0.1); color: var(--positive); }
.badge.egreso { background: rgba(239, 68, 68, 0.1); color: var(--negative); }

/* Modales */
.modal {
    position: fixed;
    top: 0; left: 0; width: 100vw; height: 100vh;
    background: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(4px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    animation: fadeIn 0.3s;
}

.modal-content {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    padding: 2rem;
    border-radius: 16px;
    width: 100%;
    max-width: 650px;
    box-shadow: 0 20px 40px rgba(0,0,0,0.4);
    max-height: 90vh;
    overflow-y: auto;
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
}

.close-modal {
    background: transparent; border: none;
    color: var(--text-secondary);
    font-size: 1.2rem;
    cursor: pointer;
}
.close-modal:hover { color: var(--text-primary); }

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

/* --- Responsive Design (Mobile) --- */
@media (max-width: 768px) {
    #dashboard-screen {
        flex-direction: column;
    }
    
    .sidebar {
        width: 100%;
        padding: 1rem;
        border-right: none;
        border-bottom: 1px solid var(--border-color);
        flex-direction: row;
        justify-content: space-between;
        align-items: center;
        flex-wrap: wrap;
    }
    
    .sidebar .logo {
        margin-bottom: 0;
        font-size: 1.2rem;
    }
    
    .sidebar nav {
        flex-direction: row;
        width: 100%;
        justify-content: center;
        gap: 0.2rem;
        margin-top: 1rem;
    }
    
    .nav-item {
        padding: 0.6rem;
        font-size: 0.85rem;
        flex: 1;
        justify-content: center;
    }
    
    .user-info {
        display: none;
    }
    
    .main-content {
        padding: 1rem;
    }
    
    .tools-bar {
        flex-direction: column;
        align-items: stretch;
    }
    
    .filter-group {
        flex-direction: column;
        align-items: stretch;
        width: 100%;
    }
    
    .filter-group input {
        width: 100% !important;
    }
    
    .cards-grid {
        grid-template-columns: 1fr;
    }
    
    .report-flex {
        flex-direction: column;
        gap: 1.5rem;
    }
    
    /* Make tables horizontally scrollable without breaking the layout */
    .table-container {
        border-radius: 8px;
        overflow-x: auto;
    }
    
    th, td {
        padding: 0.8rem;
        font-size: 0.85rem;
        white-space: nowrap;
    }
    
    .modal-content {
        margin: 1rem;
        padding: 1.5rem;
    }
}