/* Variables CSS según el sistema de diseño */
:root {
    /* Colores Primarios */
    --primary-500: #2ECC71;
    --primary-700: #27AE60;
    --primary-100: #EAF8F0;
    
    /* Colores Neutros */
    --neutral-900: #1A202C;
    --neutral-600: #718096;
    --neutral-200: #E2E8F0;
    --neutral-100: #FFFFFF;
    --neutral-50: #F8F9FA;
    
    /* Colores Semánticos */
    --success: #2ECC71;
    --warning: #F39C12;
    --error: #E74C3C;
    
    /* Espaciado */
    --space-xs: 8px;
    --space-sm: 12px;
    --space-md: 16px;
    --space-lg: 24px;
    --space-xl: 32px;
    --space-xxl: 48px;
    --space-xxxl: 64px;
    
    /* Bordes */
    --border-radius-sm: 8px;
    --border-radius-md: 16px;
    --border-radius-lg: 24px;
    
    /* Sombras */
    --shadow-md: 0 4px 12px rgba(46, 204, 113, 0.08);
    --shadow-lg: 0 8px 24px rgba(46, 204, 113, 0.12);
    
    /* Transiciones */
    --transition-smooth: all 0.25s cubic-bezier(0.25, 0.8, 0.25, 1);
    --transition-quick: all 0.2s ease-in-out;
}

/* Reset y base */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--neutral-50);
    color: var(--neutral-900);
    line-height: 1.6;
    font-size: 16px;
}

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

.container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 var(--space-lg);
}

/* Header */
.header {
    background: var(--neutral-100);
    border-bottom: 1px solid var(--neutral-200);
    box-shadow: var(--shadow-md);
    position: sticky;
    top: 0;
    z-index: 100;
}

.header .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-lg);
}

.header-left {
    display: flex;
    align-items: center;
}

.header-right {
    display: flex;
    align-items: center;
}

.user-info {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-xs) var(--space-sm);
    background: var(--neutral-50);
    border-radius: var(--border-radius-sm);
    border: 1px solid var(--neutral-200);
}

.user-name {
    font-size: 14px;
    font-weight: 500;
    color: var(--neutral-900);
}

.logout-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    background: var(--error);
    color: white;
    border: none;
    border-radius: 50%;
    cursor: pointer;
    transition: var(--transition-quick);
    padding: 0;
}

.logout-btn:hover {
    background: #C0392B;
    transform: scale(1.05);
}

.logout-btn:active {
    transform: scale(0.95);
}

.logo {
    font-size: 24px;
    font-weight: 600;
    color: var(--primary-500);
}

.nav {
    display: flex;
    gap: var(--space-sm);
}

.nav-btn {
    padding: var(--space-sm) var(--space-lg);
    border: none;
    background: transparent;
    color: var(--neutral-600);
    font-weight: 500;
    border-radius: var(--border-radius-sm);
    cursor: pointer;
    transition: var(--transition-quick);
}

.nav-btn:hover {
    background: var(--neutral-50);
    color: var(--primary-500);
}

.nav-btn.active {
    background: var(--primary-100);
    color: var(--primary-500);
}

/* Main content */
.main {
    flex: 1;
    padding: var(--space-xl) 0;
}

.view {
    display: none;
}

.view.active {
    display: block;
}

.page-title {
    font-size: 30px;
    font-weight: 600;
    color: var(--neutral-900);
    margin-bottom: var(--space-xl);
    text-align: center;
}

/* Services Grid */
.services-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--space-lg);
    margin-bottom: var(--space-xl);
}

.service-card {
    background: var(--neutral-100);
    border-radius: var(--border-radius-md);
    padding: var(--space-lg);
    box-shadow: var(--shadow-md);
    transition: var(--transition-smooth);
    border: 1px solid var(--neutral-200);
}

.service-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.service-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: var(--space-md);
}

.service-title {
    font-size: 24px;
    font-weight: 600;
    color: var(--neutral-900);
}

.service-price {
    font-size: 24px;
    font-weight: 600;
    color: var(--primary-500);
    background: var(--primary-100);
    padding: var(--space-xs) var(--space-sm);
    border-radius: var(--border-radius-sm);
}

.service-description {
    color: var(--neutral-600);
    margin-bottom: var(--space-lg);
    line-height: 1.6;
}

.btn-book {
    width: 100%;
    padding: var(--space-sm) var(--space-lg);
    background: var(--primary-500);
    color: var(--neutral-100);
    border: none;
    border-radius: var(--border-radius-sm);
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition-quick);
}

.btn-book:hover {
    background: var(--primary-700);
    transform: scale(1.03);
}

/* Calendar */
.calendar-container {
    background: var(--neutral-100);
    border-radius: var(--border-radius-md);
    box-shadow: var(--shadow-md);
    overflow: hidden;
    margin-bottom: var(--space-xl);
}

.calendar-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--space-lg);
    background: var(--primary-100);
}

.btn-nav {
    background: var(--primary-500);
    color: var(--neutral-100);
    border: none;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    font-size: 18px;
    cursor: pointer;
    transition: var(--transition-quick);
}

.btn-nav:hover {
    background: var(--primary-700);
}

.month-title {
    font-size: 20px;
    font-weight: 600;
    color: var(--primary-700);
}

.calendar-grid {
    padding: var(--space-lg);
}

.calendar-header-days {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    gap: 1px;
    margin-bottom: var(--space-sm);
}

.day-header {
    padding: var(--space-sm);
    text-align: center;
    font-weight: 600;
    color: var(--neutral-600);
    background: var(--neutral-50);
}

.calendar-days {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    gap: 1px;
}

.calendar-day {
    aspect-ratio: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: var(--transition-quick);
    border-radius: var(--border-radius-sm);
    position: relative;
}

.calendar-day:hover {
    background: var(--primary-100);
    border: 1px solid var(--primary-500);
}

.calendar-day.available {
    color: var(--neutral-900);
}

.calendar-day.today {
    border: 2px solid var(--primary-500);
}

.calendar-day.selected {
    background: var(--primary-500);
    color: var(--neutral-100);
}

.calendar-day.unavailable {
    color: var(--neutral-200);
    cursor: not-allowed;
}

.calendar-day.past {
    color: var(--neutral-200);
    cursor: not-allowed;
}

/* Time Selector */
.time-selector {
    background: var(--neutral-100);
    border-radius: var(--border-radius-md);
    padding: var(--space-lg);
    box-shadow: var(--shadow-md);
    margin-bottom: var(--space-xl);
}

.time-selector.hidden {
    display: none;
}

.time-selector h4 {
    margin-bottom: var(--space-lg);
    color: var(--primary-700);
    font-weight: 600;
}

.time-slots {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
    gap: var(--space-sm);
}

.time-slot {
    padding: var(--space-sm) var(--space-md);
    border: 1px solid var(--neutral-200);
    background: var(--neutral-100);
    color: var(--neutral-900);
    border-radius: var(--border-radius-lg);
    cursor: pointer;
    transition: var(--transition-quick);
    font-weight: 500;
}

.time-slot:hover {
    border-color: var(--primary-500);
    color: var(--primary-500);
}

.time-slot.selected {
    background: var(--primary-500);
    color: var(--neutral-100);
    border-color: var(--primary-500);
}

.time-slot.occupied {
    background: var(--neutral-50);
    color: var(--neutral-200);
    cursor: not-allowed;
}

/* Appointments */
.appointments-filter {
    display: flex;
    gap: var(--space-sm);
    margin-bottom: var(--space-xl);
    justify-content: center;
}

.filter-btn {
    padding: var(--space-sm) var(--space-lg);
    border: 1px solid var(--neutral-200);
    background: var(--neutral-100);
    color: var(--neutral-600);
    border-radius: var(--border-radius-sm);
    cursor: pointer;
    transition: var(--transition-quick);
}

.filter-btn:hover {
    border-color: var(--primary-500);
    color: var(--primary-500);
}

.filter-btn.active {
    background: var(--primary-500);
    color: var(--neutral-100);
    border-color: var(--primary-500);
}

.appointments-list {
    display: grid;
    gap: var(--space-lg);
}

.appointment-card {
    background: var(--neutral-100);
    border-radius: var(--border-radius-md);
    padding: var(--space-lg);
    box-shadow: var(--shadow-md);
    border-left: 4px solid var(--primary-500);
}

.appointment-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: var(--space-md);
}

.appointment-date {
    font-weight: 600;
    color: var(--primary-500);
}

.appointment-time {
    font-size: 18px;
    font-weight: 600;
    color: var(--neutral-900);
}

.appointment-service {
    font-weight: 600;
    margin-bottom: var(--space-sm);
}

.appointment-client {
    color: var(--neutral-600);
    margin-bottom: var(--space-xs);
}

.appointment-pet {
    color: var(--neutral-600);
}

.appointment-actions {
    margin-top: var(--space-md);
    display: flex;
    gap: var(--space-sm);
}

.btn-cancel {
    padding: var(--space-xs) var(--space-md);
    background: var(--error);
    color: var(--neutral-100);
    border: none;
    border-radius: var(--border-radius-sm);
    cursor: pointer;
    font-size: 14px;
}

/* Modal */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    z-index: 1000;
}

.modal.show {
    display: flex;
    align-items: center;
    justify-content: center;
}

.modal-content {
    background: var(--neutral-100);
    border-radius: var(--border-radius-md);
    max-width: 500px;
    width: 90%;
    max-height: 90vh;
    overflow-y: auto;
    box-shadow: var(--shadow-lg);
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--space-lg);
    border-bottom: 1px solid var(--neutral-200);
}

.modal-header h3 {
    font-size: 20px;
    font-weight: 600;
}

.modal-close {
    background: none;
    border: none;
    font-size: 24px;
    cursor: pointer;
    color: var(--neutral-600);
}

.appointment-form {
    padding: var(--space-lg);
}

.form-group {
    margin-bottom: var(--space-lg);
}

.form-group label {
    display: block;
    margin-bottom: var(--space-xs);
    font-weight: 500;
    color: var(--neutral-900);
}

.form-group input,
.form-group select {
    width: 100%;
    padding: var(--space-sm);
    border: 1px solid var(--neutral-200);
    border-radius: var(--border-radius-sm);
    font-size: 16px;
}

.form-group input:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--primary-500);
    box-shadow: 0 0 0 3px var(--primary-100);
}

.form-summary {
    background: var(--neutral-50);
    border-radius: var(--border-radius-sm);
    padding: var(--space-md);
    margin: var(--space-lg) 0;
}

.summary-item {
    display: flex;
    justify-content: space-between;
    margin-bottom: var(--space-xs);
}

.summary-item:last-child {
    margin-bottom: 0;
    font-weight: 600;
    color: var(--primary-500);
}

.modal-actions {
    display: flex;
    gap: var(--space-md);
    margin-top: var(--space-xl);
}

.btn-cancel,
.btn-confirm {
    flex: 1;
    padding: var(--space-sm) var(--space-lg);
    border: none;
    border-radius: var(--border-radius-sm);
    cursor: pointer;
    font-weight: 500;
}

.btn-cancel {
    background: var(--neutral-200);
    color: var(--neutral-900);
}

.btn-confirm {
    background: var(--primary-500);
    color: var(--neutral-100);
}

.btn-cancel:hover {
    background: var(--neutral-300);
}

.btn-confirm:hover {
    background: var(--primary-700);
}

/* Responsive Design */
@media (max-width: 768px) {
    .container {
        padding: 0 var(--space-md);
    }
    
    .header .container {
        flex-direction: column;
        gap: var(--space-md);
    }
    
    .header-left,
    .header-right {
        width: 100%;
        justify-content: center;
    }
    
    .user-info {
        justify-content: center;
    }
    
    .nav {
        width: 100%;
        justify-content: center;
    }
    
    .page-title {
        font-size: 24px;
    }
    
    .services-grid {
        grid-template-columns: 1fr;
    }
    
    .calendar-days {
        gap: 1px;
    }
    
    .calendar-day {
        font-size: 14px;
    }
    
    .time-slots {
        grid-template-columns: repeat(auto-fit, minmax(100px, 1fr));
    }
    
    .modal-content {
        margin: var(--space-md);
        width: calc(100% - 32px);
    }
    
    .modal-actions {
        flex-direction: column;
    }
}

@media (max-width: 480px) {
    .service-header {
        flex-direction: column;
        gap: var(--space-sm);
    }
    
    .appointment-header {
        flex-direction: column;
        gap: var(--space-xs);
    }
    
    .appointments-filter {
        flex-direction: column;
    }
}

/* Utilidades */
.hidden {
    display: none !important;
}

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

.text-success {
    color: var(--success);
}

.text-warning {
    color: var(--warning);
}

.text-error {
    color: var(--error);
}