:root {
    --brand-primary: #1e3a8a; /* Deep Navy */
    --brand-secondary: #d4af37; /* Gold */
    --bg-main: #f8fafc;
    --card-bg: #ffffff;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --border-color: #e2e8f0;
    
    --status-success: #10b981;
    --status-success-bg: #d1fae5;
    --status-warning: #f59e0b;
    --status-warning-bg: #fef3c7;
    --status-error: #ef4444;
    --status-error-bg: #fee2e2;

    --font-main: 'Inter', sans-serif;
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: var(--font-main);
}

body {
    background-color: var(--bg-main);
    color: var(--text-primary);
    line-height: 1.5;
    overflow-x: hidden;
}

/* Utilities */
.d-none { display: none !important; }
.card {
    background: var(--card-bg);
    border-radius: 0.75rem;
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-sm);
}
.text-sm { font-size: 0.875rem; }
.text-muted { color: var(--text-secondary); }
.text-red { color: var(--status-error); }
.space-between { display: flex; justify-content: space-between; align-items: center; }

/* Screen Management */
.screen {
    display: none;
    min-height: 100vh;
    width: 100vw;
    animation: fadeIn 0.4s ease-in-out;
}

.screen.active {
    display: flex;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

/* =========================================
   LOGIN SCREEN
========================================= */
#login-screen {
    justify-content: center;
    align-items: center;
    background: linear-gradient(135deg, #f8fafc 0%, #e2e8f0 100%);
}

.login-card {
    background: var(--card-bg);
    padding: 2.5rem;
    border-radius: 1rem;
    box-shadow: var(--shadow-lg);
    width: 90%;
    max-width: 400px;
    text-align: center;
    border: 1px solid rgba(255,255,255,0.5);
    backdrop-filter: blur(10px);
}

.login-logo {
    width: 80px;
    height: 80px;
    margin-bottom: 1rem;
    border-radius: 50%;
    object-fit: cover;
    box-shadow: var(--shadow-sm);
}

.login-card h1 {
    font-size: 1.5rem;
    color: var(--brand-primary);
    margin-bottom: 0.25rem;
}

.subtitle {
    color: var(--text-secondary);
    font-size: 0.875rem;
    margin-bottom: 2rem;
}

.input-group {
    text-align: left;
    margin-bottom: 1.25rem;
}

.input-group label {
    display: block;
    font-size: 0.875rem;
    font-weight: 500;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.input-group input {
    width: 100%;
    padding: 0.75rem 1rem;
    border: 1px solid var(--border-color);
    border-radius: 0.5rem;
    font-size: 1rem;
    transition: all 0.2s;
}

.input-group input:focus {
    outline: none;
    border-color: var(--brand-primary);
    box-shadow: 0 0 0 3px rgba(30, 58, 138, 0.1);
}

.btn-primary {
    width: 100%;
    padding: 0.875rem;
    background-color: var(--brand-primary);
    color: white;
    border: none;
    border-radius: 0.5rem;
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: background-color 0.2s, transform 0.1s;
}

.btn-primary:hover {
    background-color: #172a6b;
}

.btn-primary:active {
    transform: scale(0.98);
}

.login-error {
    color: var(--status-error);
    font-size: 0.875rem;
    margin-bottom: 1rem;
    font-weight: 500;
}

.help-text {
    margin-top: 1.5rem;
    font-size: 0.75rem;
    color: var(--text-secondary);
    text-align: left;
    background: #f1f5f9;
    padding: 1rem;
    border-radius: 0.5rem;
}
.help-text p { margin-bottom: 0.25rem; }

/* =========================================
   DASHBOARD SCREEN (Mobile First)
========================================= */
#app-screen {
    flex-direction: column;
}

/* Sidebar */
.sidebar {
    background: var(--card-bg);
    border-bottom: 1px solid var(--border-color);
    padding: 1rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    position: sticky;
    top: 0;
    z-index: 50;
    box-shadow: var(--shadow-sm);
}

.sidebar-header {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.sidebar-logo {
    width: 40px;
    height: 40px;
    border-radius: 50%;
}

.brand-name {
    font-weight: 700;
    color: var(--brand-primary);
    font-size: 1.1rem;
}

.sidebar-nav {
    display: none; 
}

.sidebar-footer {
    display: none; 
}

/* Main Content Area */
.main-content {
    padding: 1rem;
    flex: 1;
}

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

.header-breadcrumb {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.header-breadcrumb .current {
    font-weight: 600;
    color: var(--text-primary);
}

.status-badge {
    background-color: var(--status-success-bg);
    color: var(--status-success);
    padding: 0.25rem 0.75rem;
    border-radius: 1rem;
    font-size: 0.75rem;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 0.4rem;
}

.status-badge .dot {
    width: 6px;
    height: 6px;
    background-color: var(--status-success);
    border-radius: 50%;
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.7); }
    70% { transform: scale(1); box-shadow: 0 0 0 6px rgba(16, 185, 129, 0); }
    100% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(16, 185, 129, 0); }
}

/* KPIs */
.kpi-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1rem;
    margin-bottom: 2rem;
}

.kpi-card {
    background: var(--card-bg);
    padding: 1.5rem;
    border-radius: 0.75rem;
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-sm);
    transition: transform 0.2s;
}

.kpi-card:hover { transform: translateY(-2px); box-shadow: var(--shadow-md); }

.kpi-label { font-size: 0.875rem; color: var(--text-secondary); margin-bottom: 0.5rem; font-weight: 500; }
.kpi-value { font-size: 1.75rem; font-weight: 700; color: var(--text-primary); margin-bottom: 0.5rem; }

.kpi-trend { font-size: 0.75rem; font-weight: 600; }
.kpi-trend.positive { color: var(--status-success); }
.kpi-trend.warning { color: var(--status-warning); }
.kpi-trend.secure { color: var(--brand-secondary); }

/* Charts */
.charts-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.chart-card {
    padding: 1.5rem;
}

.chart-card h3 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 1.5rem;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 0.75rem;
}

.chart-container-doughnut {
    position: relative;
    height: 250px;
    width: 100%;
    display: flex;
    justify-content: center;
}

.chart-container-bar {
    position: relative;
    height: 300px;
    width: 100%;
}

/* Table Section */
.table-section {
    margin-bottom: 2rem;
    overflow: hidden; 
}

.section-header {
    padding: 1.25rem 1.5rem;
    border-bottom: 1px solid var(--border-color);
}

.section-header h3 {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: 0.25rem;
}

.action-buttons {
    display: flex;
    gap: 0.5rem;
    margin-top: 1rem;
}

.btn-action {
    padding: 0.5rem 1rem;
    border: none;
    border-radius: 0.5rem;
    font-weight: 500;
    color: white;
    font-size: 0.875rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    transition: opacity 0.2s;
}

.btn-action:hover { opacity: 0.9; }
.bg-green { background-color: var(--status-success); }
.bg-red { background-color: var(--status-error); }

.table-container {
    width: 100%;
    overflow-x: auto; 
    -webkit-overflow-scrolling: touch; 
}

table {
    width: 100%;
    min-width: 700px; 
    border-collapse: collapse;
}

th, td {
    padding: 1rem 1.5rem;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
    font-size: 0.875rem;
}

th {
    background-color: var(--bg-main);
    color: var(--text-secondary);
    font-weight: 500;
    text-transform: uppercase;
    font-size: 0.75rem;
    letter-spacing: 0.05em;
    white-space: nowrap;
}

tbody tr:hover { background-color: #f8fafc; }

/* Badges */
.badge {
    padding: 0.25rem 0.5rem;
    border-radius: 0.25rem;
    font-size: 0.75rem;
    font-weight: 600;
    display: inline-block;
    white-space: nowrap;
}

.badge.success { background-color: var(--status-success-bg); color: var(--status-success); }
.badge.warning { background-color: var(--status-warning-bg); color: var(--status-warning); }
.badge.error {
    background-color: var(--status-error);
    color: white;
    box-shadow: 0 2px 4px rgba(239, 68, 68, 0.3);
}

/* Comprobantes Grid */
.comprobantes-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1.5rem;
}

.comprobante-card {
    padding: 1.25rem;
    border-left-width: 4px;
    border-left-style: solid;
}

.border-green { border-left-color: var(--status-success); }
.border-red { border-left-color: var(--status-error); }
.border-yellow { border-left-color: var(--status-warning); }

.comp-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.75rem;
}

.comp-time {
    font-size: 0.75rem;
    color: var(--text-secondary);
}

.comprobante-card h4 {
    font-size: 1rem;
    margin-bottom: 0.25rem;
}

.comp-client {
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin-bottom: 1rem;
}

.comp-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-top: 1px solid var(--border-color);
    padding-top: 0.75rem;
}

.btn-icon {
    background: none;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    font-size: 0.875rem;
    display: flex;
    align-items: center;
    gap: 0.3rem;
    transition: color 0.2s;
}

.btn-icon:hover { color: var(--brand-primary); }
.btn-icon.text-red:hover { color: var(--status-error); }

/* WhatsApp Button */
.btn-whatsapp {
    background-color: #25D366;
    color: white;
    border: none;
    padding: 0.4rem 0.75rem;
    border-radius: 0.25rem;
    font-size: 0.75rem;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 0.4rem;
    transition: opacity 0.2s;
}

.btn-whatsapp:hover { opacity: 0.9; }
.btn-whatsapp.outline {
    background-color: transparent;
    color: #25D366;
    border: 1px solid #25D366;
}
.btn-whatsapp.outline:hover {
    background-color: #f0fdf4;
}

/* =========================================
   DESKTOP / TABLET OVERRIDES
========================================= */
@media (min-width: 768px) {
    #app-screen { flex-direction: row; }

    .sidebar {
        width: 250px;
        height: 100vh;
        flex-direction: column;
        justify-content: flex-start;
        align-items: stretch;
        position: sticky;
        top: 0;
        border-right: 1px solid var(--border-color);
        border-bottom: none;
        padding: 1.5rem;
    }

    .sidebar-header { margin-bottom: 2.5rem; }
    
    .sidebar-nav { display: block; flex: 1; }
    .sidebar-nav ul { list-style: none; }
    .sidebar-nav li { margin-bottom: 0.5rem; }

    .sidebar-nav a {
        display: flex;
        align-items: center;
        padding: 0.75rem 1rem;
        color: var(--text-secondary);
        text-decoration: none;
        border-radius: 0.5rem;
        font-weight: 500;
        transition: all 0.2s;
        gap: 0.75rem;
    }

    .sidebar-nav li.active a, .sidebar-nav a:hover {
        background: #eff6ff;
        color: var(--brand-primary);
    }

    .sidebar-footer {
        display: block;
        padding-top: 1.5rem;
        border-top: 1px solid var(--border-color);
    }

    .user-info {
        display: flex;
        align-items: center;
        gap: 0.75rem;
        margin-bottom: 1rem;
    }

    .avatar {
        width: 36px;
        height: 36px;
        background: var(--brand-primary);
        color: white;
        border-radius: 50%;
        display: flex;
        align-items: center;
        justify-content: center;
        font-weight: 600;
        font-size: 0.875rem;
    }

    .details .name { font-size: 0.875rem; font-weight: 600; }
    .details .role { font-size: 0.75rem; color: var(--text-secondary); }

    .btn-logout {
        width: 100%;
        padding: 0.5rem;
        background: none;
        border: 1px solid var(--border-color);
        color: var(--text-secondary);
        border-radius: 0.5rem;
        cursor: pointer;
        transition: all 0.2s;
        font-size: 0.875rem;
        display: flex;
        justify-content: center;
        align-items: center;
        gap: 0.5rem;
    }

    .btn-logout:hover {
        background: var(--status-error-bg);
        color: var(--status-error);
        border-color: var(--status-error-bg);
    }

    .main-content {
        padding: 2rem 3rem;
        max-width: 1200px;
        margin: 0 auto;
    }

    .kpi-grid { grid-template-columns: repeat(3, 1fr); }
    .charts-grid { grid-template-columns: 1fr 2fr; }
    
    .section-header.space-between {
        flex-direction: row;
    }
    .action-buttons {
        margin-top: 0;
    }

    .comprobantes-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}