/* Google Fonts */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&display=swap');

:root {
    --bg-color: #0f172a;
    --sidebar-bg: #1e293b;
    --card-bg: #1e293b;
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --primary-color: #018fff;
    --primary-hover: #0076d6;
    --accent-color: #38bdf8;
    --success-color: #10b981;
    --warning-color: #f59e0b;
    --danger-color: #ef4444;
    --border-color: #334155;
    --glass-bg: rgba(30, 41, 59, 0.7);
    --input-bg: rgba(0, 0, 0, 0.2);
    --input-text: #ffffff;
}

[data-theme="light"] {
    --bg-color: #f1f5f9;
    --sidebar-bg: #ffffff;
    --card-bg: #ffffff;
    --text-primary: #0f172a;
    --text-secondary: #475569;
    --border-color: #cbd5e1;
    --glass-bg: rgba(255, 255, 255, 0.7);
    --input-bg: #ffffff;
    --input-text: #0f172a;
}

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

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

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

.brand {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 3rem;
    padding-left: 1rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.nav-menu {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.nav-item {
    padding: 0.75rem 1rem;
    border-radius: 0.5rem;
    cursor: pointer;
    color: var(--text-secondary);
    transition: all 0.3s ease;
    font-weight: 500;
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

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

.nav-item svg {
    width: 20px;
    height: 20px;
}

/* Main Content */
.main-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    height: 100vh;
    overflow-y: auto;
}

.header {
    padding: 1.5rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid var(--border-color);
    background-color: var(--glass-bg);
    backdrop-filter: blur(10px);
    position: sticky;
    top: 0;
    z-index: 10;
}

.header h1 {
    font-size: 1.5rem;
    font-weight: 600;
}

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

.btn {
    padding: 0.5rem 1rem;
    border-radius: 0.5rem;
    border: none;
    cursor: pointer;
    font-weight: 500;
    transition: all 0.3s ease;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.875rem;
}

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

.btn-primary:hover {
    background-color: var(--primary-hover);
    transform: translateY(-1px);
}

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

/* Tabs Content */
.tab-pane {
    display: none;
    padding: 2rem;
    animation: fadeIn 0.3s ease;
}

.tab-pane.active {
    display: block;
}

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

/* Dashboard Metrics */
.metrics-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.metric-card {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 1rem;
    padding: 1.5rem;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    transition: transform 0.3s ease;
}

.metric-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.5);
    border-color: var(--primary-color);
}

.metric-title {
    color: var(--text-secondary);
    font-size: 0.875rem;
    font-weight: 500;
}

.metric-value {
    font-size: 1.5rem;
    font-weight: 700;
}

.metric-value.text-danger { color: var(--danger-color); }
.metric-value.text-success { color: var(--success-color); }
.metric-value.text-warning { color: var(--warning-color); }

/* Tables */
.table-container {
    background-color: var(--card-bg);
    border-radius: 1rem;
    border: 1px solid var(--border-color);
    overflow: hidden;
    margin-bottom: 2rem;
}

.table-header {
    padding: 1rem 1.5rem;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

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

th, td {
    padding: 0.75rem 1.5rem;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
    font-size: 0.875rem;
}

th {
    color: var(--text-secondary);
    font-weight: 500;
    font-size: 0.875rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

tr:hover {
    background-color: rgba(255, 255, 255, 0.02);
}

.badge {
    padding: 0.25rem 0.75rem;
    border-radius: 9999px;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
}

.badge-vencido { background-color: rgba(239, 68, 68, 0.2); color: var(--danger-color); }
.badge-pendiente { background-color: rgba(245, 158, 11, 0.2); color: var(--warning-color); }
.badge-pagado { background-color: rgba(16, 185, 129, 0.2); color: var(--success-color); }

/* Grid Cards (Clients) */
.clients-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 1.5rem;
}

@media (max-width: 1400px) {
    .clients-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}
@media (max-width: 1024px) {
    .clients-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}
@media (max-width: 640px) {
    .clients-grid {
        grid-template-columns: 1fr;
    }
}

.client-card {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 1rem;
    padding: 1.5rem;
    cursor: pointer;
    transition: all 0.3s ease;
}

.client-card:hover {
    transform: translateY(-5px);
    border-color: var(--accent-color);
    box-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.5);
}

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

.client-title {
    font-size: 1.25rem;
    font-weight: 600;
}

.client-subtitle {
    color: var(--text-secondary);
    font-size: 0.875rem;
    margin-top: 0.25rem;
}

.client-actions {
    display: flex;
    gap: 0.5rem;
}

/* Modals & Offcanvas */
.modal-overlay {
    position: fixed;
    top: 0; left: 0; right: 0; bottom: 0;
    background-color: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(5px);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 50;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s ease;
}

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

.modal-content {
    background-color: var(--card-bg);
    border-radius: 1rem;
    border: 1px solid var(--border-color);
    width: 100%;
    max-width: 500px;
    padding: 2rem;
    transform: scale(0.9);
    transition: transform 0.3s ease;
    max-height: 90vh;
    overflow-y: auto;
}

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

.offcanvas {
    position: fixed;
    top: 0; right: -70vw; bottom: 0;
    width: 100%;
    max-width: 70vw;
    background-color: var(--bg-color);
    border-left: 1px solid var(--border-color);
    z-index: 60;
    transition: right 0.3s ease;
    display: flex;
    flex-direction: column;
    box-shadow: -10px 0 30px rgba(0,0,0,0.5);
}

.offcanvas.active {
    right: 0;
}

.offcanvas-header {
    padding: 1.5rem 2rem;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
    background-color: var(--sidebar-bg);
}

.offcanvas-body {
    padding: 2rem;
    flex: 1;
    overflow-y: auto;
}

.close-btn {
    background: none;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    font-size: 1.5rem;
    transition: color 0.3s;
}

.close-btn:hover {
    color: white;
}

/* Forms */
.form-group {
    margin-bottom: 1.5rem;
}

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

.form-control {
    width: 100%;
    padding: 0.75rem 1rem;
    background-color: var(--input-bg);
    border: 1px solid var(--border-color);
    border-radius: 0.5rem;
    color: var(--input-text);
    font-size: 1rem;
    transition: all 0.3s ease;
}

.form-control:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 2px rgba(99, 102, 241, 0.2);
}

.form-row {
    display: flex;
    gap: 1rem;
}
.form-row .form-group {
    flex: 1;
}

/* Login Screen */
#login-screen {
    position: fixed;
    top: 0; left: 0; right: 0; bottom: 0;
    background-color: var(--bg-color);
    z-index: 100;
    display: flex;
    justify-content: center;
    align-items: center;
}

.login-card {
    background-color: var(--card-bg);
    padding: 3rem;
    border-radius: 1.5rem;
    border: 1px solid var(--border-color);
    width: 100%;
    max-width: 400px;
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
    text-align: center;
}

.login-card h2 {
    margin-bottom: 2rem;
    color: var(--primary-color);
}

.hidden {
    display: none !important;
}

/* Utilities */
.mb-1 { margin-bottom: 0.25rem; }
.mb-2 { margin-bottom: 0.5rem; }
.mb-4 { margin-bottom: 1rem; }
.mt-4 { margin-top: 1rem; }
.d-flex { display: flex; }
.justify-between { justify-content: space-between; }
.align-center { align-items: center; }
.gap-2 { gap: 0.5rem; }
.text-sm { font-size: 0.875rem; }
.text-muted { color: var(--text-secondary); }

.whatsapp-btn {
    background-color: #25D366;
    color: white;
}
.whatsapp-btn:hover {
    background-color: #128C7E;
}

.client-actions-top {
    display: flex;
    gap: 0.25rem;
}
.icon-btn {
    background: none;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    transition: color 0.3s ease;
    padding: 0.25rem;
    display: inline-flex;
    align-items: center;
    justify-content: center;
}
.icon-btn:hover {
    color: var(--primary-color);
}
.icon-btn.danger:hover {
    color: var(--danger-color);
}
.icon-btn.text-success:hover {
    color: var(--success-color);
}
.icon-btn svg {
    width: 20px;
    height: 20px;
}
.info-row {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: 0.5rem;
    color: var(--text-secondary);
    font-size: 0.875rem;
}
.info-row svg {
    width: 16px;
    height: 16px;
    flex-shrink: 0;
}