:root {
    /* Color Palette - Premium Dark/Neon Vibe */
    --bg-app: #0f1115;
    --bg-sidebar: #171a21;
    --bg-card: #1e222b;
    --bg-card-hover: #252a35;
    --text-primary: #ffffff;
    --text-secondary: #a0a4b0;
    --primary-color: #6366f1;
    /* Indigo */
    --primary-hover: #4f46e5;
    --accent-color: #ec4899;
    /* Pink/Rose for gradients */

    --success: #10b981;
    --danger: #ef4444;
    --warning: #f59e0b;

    --border-color: #2e3340;
    --glass-border: rgba(255, 255, 255, 0.08);

    /* Spacing & Radius */
    --radius-lg: 16px;
    --radius-md: 10px;
    --radius-sm: 6px;

    /* Shadows */
    --shadow-soft: 0 4px 20px rgba(0, 0, 0, 0.2);
    --shadow-glow: 0 0 15px rgba(99, 102, 241, 0.3);

    /* Transitions */
    --trans-speed: 0.3s;
}

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

body {
    background-color: var(--bg-app);
    color: var(--text-primary);
    height: 100vh;
    overflow: hidden;
    /* Scroll inside main-content */
}

/* Layout */
.app-container {
    display: flex;
    height: 100vh;
}

/* Sidebar */
.sidebar {
    width: 210px;
    background-color: var(--bg-sidebar);
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    padding: 16px;
}

.brand {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 40px;
}

.logo-icon {
    width: 40px;
    height: 40px;
    border-radius: 10px;
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    color: white;
    font-weight: 800;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
    box-shadow: var(--shadow-glow);
}

.brand h1 {
    font-size: 20px;
    font-weight: 600;
    letter-spacing: -0.5px;
}

.highlight {
    color: var(--primary-color);
}

.nav-menu {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.nav-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 10px 12px;
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
    font-size: 13px;
    transition: all var(--trans-speed);
}

.nav-item:hover,
.nav-item.active {
    background-color: var(--bg-card-hover);
    color: var(--text-primary);
}

.nav-item.active {
    background-color: rgba(99, 102, 241, 0.1);
    /* Low opacity primary */
    color: var(--primary-color);
    border: 1px solid var(--glass-border);
}

.sidebar-footer {
    border-top: 1px solid var(--border-color);
    padding-top: 20px;
    font-size: 12px;
    color: var(--text-secondary);
    text-align: center;
}

/* Main Content */
.main-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    background-image: radial-gradient(circle at top right, rgba(99, 102, 241, 0.05), transparent 40%);
}

.top-bar {
    height: 80px;
    padding: 0 40px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    border-bottom: 1px solid var(--border-color);
}

.user-profile {
    display: flex;
    align-items: center;
    gap: 12px;
}

.avatar {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background-color: var(--primary-color);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    font-size: 14px;
}

#content-area {
    flex: 1;
    overflow-y: auto;
    padding: 24px;
    position: relative;
}

/* Views Management */
.view {
    display: none;
    animation: fadeIn 0.4s ease;
}

.view.active-view {
    display: block;
}

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

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Stats Grid */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 24px;
    margin-bottom: 40px;
}

.stat-card {
    background-color: var(--bg-card);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-lg);
    padding: 16px;
    display: flex;
    align-items: flex-start;
    gap: 20px;
    transition: transform 0.2s;
    box-shadow: var(--shadow-soft);
}

.stat-card:hover {
    transform: translateY(-4px);
    background-color: var(--bg-card-hover);
}

.icon-box {
    width: 48px;
    height: 48px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
}

.icon-box.info {
    background: rgba(99, 102, 241, 0.15);
    color: var(--primary-color);
}

.icon-box.warning {
    background: rgba(245, 158, 11, 0.15);
    color: var(--warning);
}

.icon-box.success {
    background: rgba(16, 185, 129, 0.15);
    color: var(--success);
}

.stat-info h3 {
    font-size: 14px;
    font-weight: 500;
    color: var(--text-secondary);
    margin-bottom: 8px;
}

.stat-info p {
    font-size: 24px;
    font-weight: 700;
    color: var(--text-primary);
}

/* Tables */
.table-container {
    background-color: var(--bg-card);
    border-radius: var(--radius-lg);
    border: 1px solid var(--glass-border);
    overflow: hidden;
    box-shadow: var(--shadow-soft);
}

.data-table {
    width: 100%;
    border-collapse: collapse;
    color: var(--text-primary);
}

.data-table th,
.data-table td {
    padding: 10px 16px;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
    font-size: 13px;
}

.data-table th {
    background-color: rgba(0, 0, 0, 0.2);
    font-weight: 600;
    font-size: 12px;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--text-secondary);
}

.data-table tbody tr:hover {
    background-color: rgba(255, 255, 255, 0.02);
}

.data-table tbody tr:last-child td {
    border-bottom: none;
}

.text-right {
    text-align: right;
}

/* Buttons & Inputs */
.btn {
    padding: 8px 14px;
    border-radius: var(--radius-sm);
    border: none;
    font-weight: 600;
    cursor: pointer;
    font-size: 12px;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    transition: all 0.2s;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-color), #4338ca);
    color: white;
    box-shadow: 0 4px 12px rgba(99, 102, 241, 0.4);
}

.btn-primary:hover {
    filter: brightness(1.1);
    transform: translateY(-1px);
}

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

.btn-secondary:hover {
    background-color: var(--bg-card-hover);
    color: var(--text-primary);
}

.btn-success {
    background-color: var(--success);
    color: #000;
}

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

.action-bar {
    display: flex;
    justify-content: space-between;
    margin-bottom: 24px;
    gap: 16px;
}

input[type="text"],
input[type="email"],
input[type="number"],
input[type="date"] {
    background-color: var(--bg-app);
    border: 1px solid var(--border-color);
    padding: 12px 16px;
    border-radius: var(--radius-sm);
    color: white;
    font-size: 14px;
    width: 300px;
    /* Default for search */
}

input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.2);
}

/* Specific Client Detail Styles */
.client-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 30px;
}

.client-title-info {
    display: flex;
    align-items: center;
    gap: 16px;
}

.badge {
    padding: 4px 10px;
    border-radius: 20px;
    background-color: rgba(99, 102, 241, 0.1);
    /* Default neutral */
    color: var(--primary-color);
    font-weight: 700;
    font-size: 13px;
}

.badge.positive {
    background-color: rgba(239, 68, 68, 0.15);
    color: var(--danger);
}

/* Deben plata (rojo) */
.badge.neutral {
    background-color: rgba(16, 185, 129, 0.15);
    color: var(--success);
}

/* Al día (verde) */

.client-info-cards {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 16px;
    margin-bottom: 40px;
}

.info-card {
    background-color: var(--bg-card);
    padding: 16px;
    border-radius: var(--radius-md);
    border: 1px solid var(--glass-border);
}

.info-card small {
    display: block;
    color: var(--text-secondary);
    font-size: 12px;
    margin-bottom: 4px;
}

.info-card p {
    font-weight: 500;
}

/* Modal */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(4px);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s;
    z-index: 1000;
}

.modal-overlay.active {
    opacity: 1;
    pointer-events: all;
}

.modal {
    background-color: var(--bg-card);
    width: 100%;
    max-width: 500px;
    padding: 30px;
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-color);
    box-shadow: 0 20px 50px rgba(0, 0, 0, 0.5);
    transform: scale(0.95);
    transition: transform 0.3s;
}

.modal-overlay.active .modal {
    transform: scale(1);
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 24px;
}

.close-modal {
    background: none;
    border: none;
    color: var(--text-secondary);
    font-size: 24px;
    cursor: pointer;
}

.form-group {
    margin-bottom: 16px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    color: var(--text-secondary);
    font-size: 14px;
}

.form-group input {
    width: 100%;
}

.modal-footer {
    margin-top: 32px;
    display: flex;
    justify-content: flex-end;
    gap: 12px;
}

/* Toast */
.toast {
    position: fixed;
    bottom: 30px;
    right: 30px;
    background-color: var(--success);
    color: black;
    padding: 12px 24px;
    border-radius: var(--radius-sm);
    font-weight: 600;
    transform: translateY(100px);
    transition: transform 0.3s;
}

.toast:not(.hidden) {
    transform: translateY(0);
}

/* Custom Scrollbar */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: transparent;
}

::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--text-secondary);
}

.hidden {
    display: none !important;
}