/* 
 * RedPhone Services - Sistema de Gestión de Inventario
 * Archivo: styles.css
 * Descripción: Estilos principales de la aplicación
 * Versión: 1.0.0
 */

/* ===== RESET Y BASE ===== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background-color: #F8F9FA;
    color: #212529;
    line-height: 1.5;
    overflow-x: hidden;
}

/* ===== PANTALLA DE LOGIN ===== */
.login-screen {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, var(--primary-500) 0%, var(--primary-700) 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 9999;
    padding: 20px;
}

.login-container {
    background: var(--surface-white);
    border-radius: 16px;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
    padding: 40px;
    width: 100%;
    max-width: 400px;
    text-align: center;
}

.login-header {
    margin-bottom: 32px;
}

.login-logo {
    width: 60px;
    height: 60px;
    background: var(--primary-500);
    color: white;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    font-weight: 700;
    margin: 0 auto 16px;
}

.login-header h1 {
    color: var(--neutral-900);
    font-size: 28px;
    font-weight: 700;
    margin-bottom: 8px;
}

.login-header p {
    color: var(--neutral-500);
    font-size: 16px;
}

.login-form h3 {
    color: var(--neutral-900);
    font-size: 20px;
    font-weight: 600;
    margin-bottom: 24px;
}

.user-selection {
    margin-bottom: 24px;
    text-align: left;
}

.user-selection label {
    display: block;
    font-size: 14px;
    font-weight: 500;
    color: var(--neutral-500);
    margin-bottom: 8px;
    text-transform: uppercase;
    letter-spacing: 0.02em;
}

.user-select {
    width: 100%;
    padding: 12px 16px;
    border: 2px solid var(--neutral-200);
    border-radius: 8px;
    font-size: 16px;
    font-family: inherit;
    background: var(--surface-white);
    color: var(--neutral-900);
    transition: all 0.2s ease;
}

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

.user-select:invalid {
    border-color: var(--danger-500);
}

.login-btn {
    width: 100%;
    padding: 14px 24px;
    background: var(--primary-500);
    color: white;
    border: none;
    border-radius: 8px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
}

.login-btn:hover:not(:disabled) {
    background: var(--primary-700);
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(215, 39, 44, 0.3);
}

.login-btn:disabled {
    background: var(--neutral-200);
    color: var(--neutral-500);
    transform: none;
    box-shadow: none;
}

.login-btn.invalid {
    background: var(--neutral-200);
    color: var(--neutral-500);
    transform: none;
    box-shadow: none;
}

.btn-icon {
    width: 20px;
    height: 20px;
}

.login-info {
    margin-top: 16px;
    padding-top: 16px;
    border-top: 1px solid var(--neutral-200);
}

.login-info small {
    color: var(--neutral-500);
    font-size: 14px;
}

/* Animación de entrada */
.login-screen {
    animation: fadeInUp 0.5s ease-out;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Responsive */
@media (max-width: 480px) {
    .login-container {
        padding: 24px;
        margin: 20px;
    }
    
    .login-header h1 {
        font-size: 24px;
    }
    
    .login-logo {
        width: 50px;
        height: 50px;
        font-size: 20px;
    }
}

/* ===== VARIABLES CSS ===== */
:root {
    /* Colores Primarios */
    --primary-500: #D7272C;
    --primary-100: #FBE9E9;
    --primary-700: #B91C1C;
    
    /* Neutros */
    --neutral-100: #F8F9FA;
    --neutral-200: #E9ECEF;
    --neutral-500: #6C757D;
    --neutral-900: #212529;
    --surface-white: #FFFFFF;
    
    /* Semánticos */
    --success-500: #198754;
    --success-100: #D1E7DD;
    --warning-500: #FFC107;
    --warning-100: #FFF3CD;
    --danger-500: #DC3545;
    --danger-100: #F8D7DA;
    
    /* Espaciado (Grid 8px) */
    --space-xs: 8px;
    --space-sm: 16px;
    --space-md: 24px;
    --space-lg: 32px;
    --space-xl: 48px;
    --space-xxl: 64px;
    
    /* Radios */
    --radius-sm: 6px;
    --radius-md: 8px;
    
    /* Sombras */
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.08);
    --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.12);
    
    /* Layout */
    --sidebar-width: 240px;
    --sidebar-collapsed-width: 80px;
    --header-height: 70px;
    --container-max-width: 1440px;
}

/* ===== TIPOGRAFÍA ===== */
h1 {
    font-size: 30px;
    font-weight: 700;
    line-height: 1.2;
    color: var(--neutral-900);
}

h2 {
    font-size: 24px;
    font-weight: 600;
    line-height: 1.3;
    color: var(--neutral-900);
}

h3 {
    font-size: 20px;
    font-weight: 600;
    line-height: 1.4;
    color: var(--neutral-900);
}

p, body {
    font-size: 16px;
    font-weight: 400;
    line-height: 1.5;
}

.label {
    font-size: 14px;
    font-weight: 500;
    line-height: 1.5;
    letter-spacing: 0.02em;
    text-transform: uppercase;
    color: var(--neutral-500);
}

.small {
    font-size: 12px;
    font-weight: 400;
    line-height: 1.5;
    color: var(--neutral-500);
}

/* ===== LAYOUT PRINCIPAL ===== */
.app-layout {
    display: flex;
    min-height: 100vh;
    background-color: var(--neutral-100);
}

/* ===== SIDEBAR ===== */
.sidebar {
    width: var(--sidebar-width);
    background-color: var(--surface-white);
    border-right: 1px solid var(--neutral-200);
    position: fixed;
    height: 100vh;
    left: 0;
    top: 0;
    z-index: 1000;
    transition: transform 0.3s ease;
}

.sidebar-header {
    padding: var(--space-md);
    border-bottom: 1px solid var(--neutral-200);
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    position: relative;
}

.logout-btn {
    position: absolute;
    bottom: 8px;
    left: 50%;
    transform: translateX(-50%);
    padding: 8px 12px;
    background: var(--danger-500);
    color: white;
    border: none;
    border-radius: 6px;
    font-size: 12px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    gap: 6px;
    opacity: 0.8;
}

.logout-btn:hover {
    background: var(--danger-700);
    opacity: 1;
    transform: translateX(-50%) translateY(-1px);
}

.logout-btn svg {
    width: 14px;
    height: 14px;
}

.logo {
    width: 40px;
    height: 40px;
    background-color: var(--primary-500);
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-weight: 700;
    font-size: 18px;
}

.company-name {
    font-weight: 600;
    font-size: 16px;
    color: var(--neutral-900);
}

.sidebar-nav {
    padding: var(--space-sm) 0;
}

.nav-item {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    padding: 12px var(--space-md);
    color: var(--neutral-500);
    text-decoration: none;
    font-size: 16px;
    font-weight: 500;
    transition: all 0.2s ease-out;
    border-left: 3px solid transparent;
    cursor: pointer;
}

.nav-item:hover {
    background-color: var(--primary-100);
    color: var(--primary-500);
    text-decoration: none;
}

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

.nav-icon {
    width: 20px;
    height: 20px;
    flex-shrink: 0;
}

/* ===== CONTENIDO PRINCIPAL ===== */
.main-content {
    flex: 1;
    margin-left: var(--sidebar-width);
    min-height: 100vh;
}

.header {
    background-color: var(--surface-white);
    border-bottom: 1px solid var(--neutral-200);
    padding: 0 var(--space-lg);
    height: var(--header-height);
    display: flex;
    align-items: center;
    justify-content: space-between;
    position: sticky;
    top: 0;
    z-index: 100;
}

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

.user-info {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    color: var(--neutral-500);
    font-size: 14px;
}

.content-area {
    padding: var(--space-xl);
    max-width: var(--container-max-width);
    margin: 0 auto;
}

/* ===== TARJETAS ===== */
.card {
    background-color: var(--surface-white);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-md);
    overflow: hidden;
    margin-bottom: var(--space-lg);
}

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

.card-title {
    font-size: 20px;
    font-weight: 600;
    color: var(--neutral-900);
}

.card-body {
    padding: var(--space-md);
}

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

/* ===== BOTONES ===== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-xs);
    height: 44px;
    padding: 12px 24px;
    font-size: 16px;
    font-weight: 600;
    border-radius: var(--radius-sm);
    border: none;
    cursor: pointer;
    transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    text-decoration: none;
    line-height: 1;
}

.btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

.btn-primary {
    background-color: var(--primary-500);
    color: var(--surface-white);
}

.btn-primary:hover:not(:disabled) {
    background-color: var(--primary-700);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.btn-secondary {
    background-color: transparent;
    color: var(--neutral-900);
    border: 1px solid var(--neutral-200);
}

.btn-secondary:hover:not(:disabled) {
    background-color: var(--neutral-100);
}

.btn-success {
    background-color: var(--success-500);
    color: var(--surface-white);
}

.btn-warning {
    background-color: var(--warning-500);
    color: var(--neutral-900);
}

.btn-danger {
    background-color: var(--danger-500);
    color: var(--surface-white);
}

.btn-sm {
    height: 36px;
    padding: 8px 16px;
    font-size: 14px;
}

.btn-lg {
    height: 52px;
    padding: 16px 32px;
    font-size: 18px;
}

/* ===== FORMULARIOS ===== */
.form-group {
    margin-bottom: var(--space-md);
}

.form-label {
    display: block;
    font-size: 14px;
    font-weight: 500;
    color: var(--neutral-900);
    margin-bottom: var(--space-xs);
}

.form-input {
    width: 100%;
    height: 48px;
    padding: 0 var(--space-sm);
    background-color: var(--surface-white);
    border: 1px solid var(--neutral-200);
    border-radius: var(--radius-sm);
    font-size: 16px;
    transition: all 0.2s ease;
}

.form-input:focus {
    outline: none;
    border: 2px solid var(--primary-500);
    box-shadow: 0 0 0 3px rgba(215, 39, 44, 0.1);
}

.form-input.error {
    border-color: var(--danger-500);
    box-shadow: 0 0 0 3px rgba(220, 53, 69, 0.1);
}

.form-textarea {
    min-height: 100px;
    padding: var(--space-sm);
    resize: vertical;
}

.form-select {
    background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' fill='none' viewBox='0 0 20 20'%3e%3cpath stroke='%236b7280' stroke-linecap='round' stroke-linejoin='round' stroke-width='1.5' d='M6 8l4 4 4-4'/%3e%3c/svg%3e");
    background-position: right var(--space-sm) center;
    background-repeat: no-repeat;
    background-size: 16px 12px;
    padding-right: var(--space-xl);
    appearance: none;
}

.form-error {
    color: var(--danger-500);
    font-size: 12px;
    margin-top: var(--space-xs);
}

.form-row {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--space-md);
}

/* ===== TABLAS ===== */
.table-container {
    overflow-x: auto;
    border-radius: var(--radius-md);
    border: 1px solid var(--neutral-200);
}

.table {
    width: 100%;
    border-collapse: collapse;
    background-color: var(--surface-white);
}

.table th {
    background-color: var(--neutral-100);
    padding: var(--space-sm);
    text-align: left;
    font-size: 14px;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.02em;
    color: var(--neutral-500);
    border-bottom: 1px solid var(--neutral-200);
}

.table td {
    padding: var(--space-sm);
    border-bottom: 1px solid var(--neutral-200);
    vertical-align: middle;
}

.table tr:hover {
    background-color: #F8F9FA;
}

.table .actions {
    display: flex;
    gap: var(--space-xs);
}

/* ===== BADGES Y ESTADOS ===== */
.badge {
    display: inline-flex;
    align-items: center;
    gap: var(--space-xs);
    padding: 4px 8px;
    font-size: 12px;
    font-weight: 500;
    border-radius: 9999px;
    text-transform: uppercase;
    letter-spacing: 0.02em;
}

.badge-stock {
    width: 10px;
    height: 10px;
    border-radius: 50%;
}

.badge-success {
    background-color: var(--success-100);
    color: var(--success-500);
}

.badge-warning {
    background-color: var(--warning-100);
    color: var(--warning-500);
}

.badge-danger {
    background-color: var(--danger-100);
    color: var(--danger-500);
}

.badge-primary {
    background-color: var(--primary-100);
    color: var(--primary-500);
}

.stock-indicator {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    margin-right: var(--space-xs);
}

.stock-high {
    background-color: var(--success-500);
}

.stock-medium {
    background-color: var(--warning-500);
}

.stock-low {
    background-color: var(--danger-500);
}

/* ===== GRID DE ESTADÍSTICAS ===== */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--space-lg);
    margin-bottom: var(--space-xl);
}

.stat-card {
    background-color: var(--surface-white);
    padding: var(--space-lg);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-md);
    border-left: 4px solid var(--primary-500);
}

.stat-value {
    font-size: 32px;
    font-weight: 700;
    color: var(--neutral-900);
    margin-bottom: var(--space-xs);
}

.stat-label {
    font-size: 14px;
    font-weight: 500;
    color: var(--neutral-500);
    text-transform: uppercase;
    letter-spacing: 0.02em;
}

.stat-change {
    font-size: 12px;
    margin-top: var(--space-xs);
}

.stat-change.positive {
    color: var(--success-500);
}

.stat-change.negative {
    color: var(--danger-500);
}

/* ===== ALERTAS Y NOTIFICACIONES ===== */
.alert {
    padding: var(--space-sm) var(--space-md);
    border-radius: var(--radius-sm);
    margin-bottom: var(--space-md);
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}

.alert-success {
    background-color: var(--success-100);
    color: var(--success-500);
    border: 1px solid var(--success-500);
}

.alert-warning {
    background-color: var(--warning-100);
    color: var(--warning-500);
    border: 1px solid var(--warning-500);
}

.alert-danger {
    background-color: var(--danger-100);
    color: var(--danger-500);
    border: 1px solid var(--danger-500);
}

/* ===== BUSCADORES Y FILTROS ===== */
.search-bar {
    display: flex;
    gap: var(--space-sm);
    margin-bottom: var(--space-md);
    flex-wrap: wrap;
}

.search-input {
    flex: 1;
    min-width: 250px;
    height: 44px;
}

.filters {
    display: flex;
    gap: var(--space-sm);
    flex-wrap: wrap;
    margin-bottom: var(--space-md);
}

/* ===== MODALES ===== */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 2000;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
}

.modal-overlay.active {
    opacity: 1;
    visibility: visible;
}

.modal {
    background-color: var(--surface-white);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    max-width: 600px;
    width: 90%;
    max-height: 90vh;
    overflow-y: auto;
    transform: scale(0.9);
    transition: transform 0.3s ease;
}

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

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

.modal-title {
    font-size: 20px;
    font-weight: 600;
    color: var(--neutral-900);
}

.modal-close {
    background: none;
    border: none;
    font-size: 24px;
    color: var(--neutral-500);
    cursor: pointer;
    padding: var(--space-xs);
    border-radius: var(--radius-sm);
    transition: all 0.2s ease;
}

.modal-close:hover {
    background-color: var(--neutral-100);
}

.modal-body {
    padding: var(--space-md);
}

.modal-footer {
    padding: var(--space-md);
    border-top: 1px solid var(--neutral-200);
    display: flex;
    gap: var(--space-sm);
    justify-content: flex-end;
}

/* ===== RESPONSIVE ===== */
@media (max-width: 1200px) {
    .content-area {
        padding: var(--space-lg);
    }
    
    .stats-grid {
        grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    }
}

@media (max-width: 768px) {
    .sidebar {
        transform: translateX(-100%);
    }
    
    .sidebar.active {
        transform: translateX(0);
    }
    
    .main-content {
        margin-left: 0;
    }
    
    .header {
        padding: 0 var(--space-sm);
    }
    
    .content-area {
        padding: var(--space-sm);
    }
    
    .form-row {
        grid-template-columns: 1fr;
    }
    
    .search-bar,
    .filters {
        flex-direction: column;
    }
    
    .search-input {
        min-width: auto;
    }
    
    .table-container {
        font-size: 14px;
    }
    
    .btn {
        width: 100%;
        justify-content: center;
    }
    
    .card-actions {
        flex-direction: column;
    }
    
    .modal {
        width: 95%;
    }
}

/* ===== UTILIDADES ===== */
.text-center {
    text-align: center;
}

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

.text-muted {
    color: var(--neutral-500);
}

.text-primary {
    color: var(--primary-500);
}

.text-success {
    color: var(--success-500);
}

.text-warning {
    color: var(--warning-500);
}

.text-danger {
    color: var(--danger-500);
}

.mb-0 { margin-bottom: 0; }
.mb-1 { margin-bottom: var(--space-xs); }
.mb-2 { margin-bottom: var(--space-sm); }
.mb-3 { margin-bottom: var(--space-md); }
.mb-4 { margin-bottom: var(--space-lg); }
.mb-5 { margin-bottom: var(--space-xl); }

.mt-0 { margin-top: 0; }
.mt-1 { margin-top: var(--space-xs); }
.mt-2 { margin-top: var(--space-sm); }
.mt-3 { margin-top: var(--space-md); }
.mt-4 { margin-top: var(--space-lg); }
.mt-5 { margin-top: var(--space-xl); }

.d-none { display: none; }
.d-block { display: block; }
.d-flex { display: flex; }
.d-grid { display: grid; }

.flex-1 { flex: 1; }
.justify-center { justify-content: center; }
.justify-between { justify-content: space-between; }
.align-center { align-items: center; }
.gap-1 { gap: var(--space-xs); }
.gap-2 { gap: var(--space-sm); }
.gap-3 { gap: var(--space-md); }

/* ===== LOADING STATES ===== */
.loading {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 2px solid var(--neutral-200);
    border-radius: 50%;
    border-top-color: var(--primary-500);
    animation: spin 1s ease-in-out infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

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

.fade-in {
    animation: fadeIn 0.3s ease-out;
}

/* ===== IMPRESIÓN ===== */
@media print {
    .sidebar,
    .header,
    .btn,
    .modal-overlay {
        display: none !important;
    }
    
    .main-content {
        margin-left: 0;
    }
    
    .content-area {
        padding: 0;
    }
    
    .card {
        box-shadow: none;
        border: 1px solid var(--neutral-200);
    }
    
    body {
        background-color: white;
    }
}