:root {
    --primary: #007AFF;
    --primary-dark: #0056CC;
    --secondary: #5856D6;
    --success: #34C759;
    --warning: #FF9500;
    --danger: #FF3B30;
    --light: #F2F2F7;
    --dark: #1C1C1E;
    --gray: #8E8E93;
    --border: #C6C6C8;
    --card-bg: #FFFFFF;
    --bg: #F2F2F7;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', sans-serif;
}

body {
    background-color: var(--bg);
    color: var(--dark);
    line-height: 1.6;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Header */
header {
    background-color: var(--card-bg);
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
    position: sticky;
    top: 0;
    z-index: 100;
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 0;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: 600;
    font-size: 1.2rem;
    color: var(--primary);
}

.logo i {
    font-size: 1.5rem;
}

nav ul {
    display: flex;
    list-style: none;
    gap: 25px;
}

nav a {
    text-decoration: none;
    color: var(--dark);
    font-weight: 500;
    transition: color 0.3s;
}

nav a:hover, nav a.active {
    color: var(--primary);
}

.user-menu {
    display: flex;
    align-items: center;
    gap: 15px;
}

.user-info {
    display: flex;
    align-items: center;
    gap: 8px;
}

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

.btn {
    padding: 10px 20px;
    border-radius: 10px;
    border: none;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s;
    display: inline-flex;
    align-items: center;
    gap: 8px;
}

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

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

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

.btn-outline:hover {
    background-color: rgba(0, 122, 255, 0.1);
}

/* Auth Forms */
.auth-container {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 80vh;
    padding: 40px 0;
}

.auth-card {
    background-color: var(--card-bg);
    border-radius: 16px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.1);
    padding: 40px;
    width: 100%;
    max-width: 450px;
}

.auth-card h2 {
    margin-bottom: 25px;
    text-align: center;
    color: var(--dark);
}

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
    color: var(--dark);
}

.form-control {
    width: 100%;
    padding: 12px 15px;
    border: 1px solid var(--border);
    border-radius: 10px;
    font-size: 1rem;
    transition: border 0.3s;
}

.form-control:focus {
    outline: none;
    border-color: var(--primary);
}

.auth-switch {
    text-align: center;
    margin-top: 25px;
    color: var(--gray);
}

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

/* Dashboard */
.dashboard {
    padding: 30px 0;
}

.dashboard-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 30px;
}

.dashboard-title {
    font-size: 1.8rem;
    font-weight: 700;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: 20px;
    margin-bottom: 30px;
}

.stat-card {
    background-color: var(--card-bg);
    border-radius: 16px;
    padding: 20px;
    box-shadow: 0 5px 15px rgba(0,0,0,0.05);
}

.stat-card i {
    font-size: 1.8rem;
    margin-bottom: 15px;
    color: var(--primary);
}

.stat-value {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 5px;
}

.stat-label {
    color: var(--gray);
    font-size: 0.9rem;
}

.charts-container {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 20px;
    margin-bottom: 30px;
}

.chart-card {
    background-color: var(--card-bg);
    border-radius: 16px;
    padding: 20px;
    box-shadow: 0 5px 15px rgba(0,0,0,0.05);
    min-height: 300px;
    display: flex;
    flex-direction: column;
}

.chart-card h3 {
    margin-bottom: 15px;
    font-weight: 600;
}

.chart-container {
    flex: 1;
    position: relative;
}

.recent-activity {
    background-color: var(--card-bg);
    border-radius: 16px;
    padding: 20px;
    box-shadow: 0 5px 15px rgba(0,0,0,0.05);
}

.recent-activity h3 {
    margin-bottom: 15px;
    font-weight: 600;
}

.activity-list {
    list-style: none;
}

.activity-item {
    display: flex;
    align-items: center;
    gap: 15px;
    padding: 12px 0;
    border-bottom: 1px solid var(--border);
}

.activity-item:last-child {
    border-bottom: none;
}

.activity-icon {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background-color: rgba(0, 122, 255, 0.1);
    color: var(--primary);
    display: flex;
    align-items: center;
    justify-content: center;
}

.activity-content {
    flex: 1;
}

.activity-title {
    font-weight: 500;
    margin-bottom: 3px;
}

.activity-time {
    font-size: 0.85rem;
    color: var(--gray);
}

/* Tabs */
.tabs {
    display: flex;
    border-bottom: 1px solid var(--border);
    margin-bottom: 20px;
    overflow-x: auto;
    white-space: nowrap;
}

.tab {
    padding: 12px 20px;
    cursor: pointer;
    font-weight: 500;
    color: var(--gray);
    transition: all 0.3s;
    border-bottom: 2px solid transparent;
    flex-shrink: 0;
}

.tab.active {
    color: var(--primary);
    border-bottom: 2px solid var(--primary);
}

.tab-content {
    display: none;
}

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

/* Table */
.table-container {
    background-color: var(--card-bg);
    border-radius: 16px;
    overflow: hidden;
    box-shadow: 0 5px 15px rgba(0,0,0,0.05);
    overflow-x: auto;
}

table {
    width: 100%;
    border-collapse: collapse;
    min-width: 600px;
}

th, td {
    padding: 15px;
    text-align: left;
    border-bottom: 1px solid var(--border);
}

th {
    font-weight: 600;
    color: var(--gray);
    font-size: 0.9rem;
}

tr:last-child td {
    border-bottom: none;
}

.status-badge {
    display: inline-block;
    padding: 5px 10px;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 600;
}

.status-pending {
    background-color: rgba(255, 149, 0, 0.1);
    color: var(--warning);
}

.status-paid {
    background-color: rgba(52, 199, 89, 0.1);
    color: var(--success);
}

.status-overdue {
    background-color: rgba(255, 59, 48, 0.1);
    color: var(--danger);
}

.action-buttons {
    display: flex;
    gap: 8px;
}

.btn-icon {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: transparent;
    border: none;
    cursor: pointer;
    transition: background-color 0.3s;
}

.btn-icon:hover {
    background-color: rgba(0,0,0,0.05);
}

/* Modal */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0,0,0,0.5);
    z-index: 1000;
    justify-content: center;
    align-items: center;
    padding: 20px;
}

.modal.active {
    display: flex;
}

.modal-content {
    background-color: var(--card-bg);
    border-radius: 16px;
    width: 100%;
    max-width: 500px;
    padding: 30px;
    box-shadow: 0 20px 60px rgba(0,0,0,0.2);
    max-height: 90vh;
    overflow-y: auto;
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
}

.modal-title {
    font-size: 1.3rem;
    font-weight: 600;
}

.close-modal {
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--gray);
}

/* Alert */
.alert {
    padding: 15px;
    border-radius: 10px;
    margin-bottom: 20px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.alert-success {
    background-color: rgba(52, 199, 89, 0.1);
    color: var(--success);
    border: 1px solid rgba(52, 199, 89, 0.2);
}

.alert-warning {
    background-color: rgba(255, 149, 0, 0.1);
    color: var(--warning);
    border: 1px solid rgba(255, 149, 0, 0.2);
}

.alert-danger {
    background-color: rgba(255, 59, 48, 0.1);
    color: var(--danger);
    border: 1px solid rgba(255, 59, 48, 0.2);
}

/* Responsive */
@media (max-width: 768px) {
    .header-content {
        flex-direction: column;
        gap: 15px;
    }

    nav ul {
        gap: 15px;
        flex-wrap: wrap;
        justify-content: center;
    }

    .charts-container {
        grid-template-columns: 1fr;
    }

    .stats-grid {
        grid-template-columns: 1fr;
    }

    .user-menu {
        flex-direction: column;
        gap: 10px;
    }

    .auth-card {
        padding: 25px;
    }

    .dashboard-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 15px;
    }

    .action-buttons {
        flex-wrap: wrap;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 15px;
    }
    
    .auth-card {
        padding: 20px;
    }
    
    .modal-content {
        padding: 20px;
    }
    
    .btn {
        padding: 8px 16px;
        font-size: 0.9rem;
    }
}

/* Plan badges */
.plan-badge {
    display: inline-block;
    padding: 5px 10px;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 600;
}

.plan-free {
    background-color: rgba(142, 142, 147, 0.1);
    color: var(--gray);
}

.plan-pro {
    background-color: rgba(88, 86, 214, 0.1);
    color: var(--secondary);
}

/* Admin panel */
.admin-panel {
    padding: 30px 0;
}

.admin-actions {
    display: flex;
    gap: 10px;
    margin-bottom: 20px;
}

/* Recibo styles */
.recibo-container {
    background-color: white;
    padding: 30px;
    border-radius: 10px;
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
    max-width: 600px;
    margin: 0 auto;
}

.recibo-header {
    text-align: center;
    margin-bottom: 30px;
    border-bottom: 2px solid var(--primary);
    padding-bottom: 20px;
}

.recibo-empresa {
    font-size: 1.5rem;
    font-weight: bold;
    margin-bottom: 10px;
}

.recibo-details {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
    margin-bottom: 30px;
}

.recibo-cliente, .recibo-info {
    background-color: var(--light);
    padding: 15px;
    border-radius: 8px;
}

.recibo-items {
    margin-bottom: 30px;
}

.recibo-item {
    display: flex;
    justify-content: space-between;
    padding: 10px 0;
    border-bottom: 1px solid var(--border);
}

.recibo-total {
    display: flex;
    justify-content: space-between;
    font-weight: bold;
    font-size: 1.2rem;
    padding-top: 15px;
    border-top: 2px solid var(--primary);
}

.recibo-footer {
    text-align: center;
    margin-top: 30px;
    font-size: 0.9rem;
    color: var(--gray);
}

/* Abonos styles */
.abonos-section {
    margin-top: 20px;
    padding-top: 20px;
    border-top: 1px solid var(--border);
}

.abono-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 10px 0;
    border-bottom: 1px solid var(--border);
}

.abono-item:last-child {
    border-bottom: none;
}

.abono-info {
    flex: 1;
}

.abono-fecha {
    font-size: 0.85rem;
    color: var(--gray);
}

.saldo-restante {
    font-weight: bold;
    margin-top: 15px;
    padding-top: 15px;
    border-top: 1px solid var(--border);
}

/* Loading states */
.loading {
    opacity: 0.6;
    pointer-events: none;
}

.connection-status {
    position: fixed;
    top: 10px;
    right: 10px;
    padding: 8px 12px;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 600;
    z-index: 1001;
    display: none;
}

.connection-online {
    background-color: var(--success);
    color: white;
}

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

/* Phone input styles */
.phone-input-container {
    position: relative;
}

.country-code {
    position: absolute;
    left: 12px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--gray);
    font-weight: 500;
}

.phone-input {
    padding-left: 50px !important;
}

/* Copy notification */
.copy-notification {
    position: fixed;
    top: 20px;
    right: 20px;
    background-color: var(--success);
    color: white;
    padding: 12px 20px;
    border-radius: 10px;
    box-shadow: 0 5px 15px rgba(0,0,0,0.2);
    z-index: 1002;
    display: none;
    align-items: center;
    gap: 10px;
}

.copy-notification.show {
    display: flex;
    animation: slideIn 0.3s ease-out;
}

@keyframes slideIn {
    from {
        transform: translateX(100%);
        opacity: 0;
    }
    to {
        transform: translateX(0);
        opacity: 1;
    }
}