/* ================================================
   Sistema de Inventario - Main CSS
   Mobile-First Responsive Design
   ================================================ */

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

:root {
    /* Colores principales */
    --primary-color: #1e40af;
    --primary-dark: #1e3a8a;
    --secondary-color: #059669;
    --accent-color: #f59e0b;
    --danger-color: #dc2626;
    --warning-color: #d97706;
    
    /* Grises */
    --gray-50: #f9fafb;
    --gray-100: #f3f4f6;
    --gray-200: #e5e7eb;
    --gray-300: #d1d5db;
    --gray-400: #9ca3af;
    --gray-500: #6b7280;
    --gray-600: #4b5563;
    --gray-700: #374151;
    --gray-800: #1f2937;
    --gray-900: #111827;
    
    /* Espaciado */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    
    /* Tipografía */
    --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 1.875rem;
    --font-size-4xl: 2.25rem;
    
    /* Bordes */
    --border-radius: 0.5rem;
    --border-radius-lg: 1rem;
    --border-width: 1px;
    
    /* Sombras */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px 0 rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
}

/* Base del body */
body {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    line-height: 1.6;
    color: var(--gray-800);
    background-color: var(--gray-50);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Touch-friendly elements */
@media (hover: none) and (pointer: coarse) {
    button, .btn, a[role="button"] {
        min-height: 44px;
        min-width: 44px;
    }
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: var(--spacing-md);
    color: var(--gray-900);
}

h1 { font-size: var(--font-size-4xl); }
h2 { font-size: var(--font-size-3xl); }
h3 { font-size: var(--font-size-2xl); }
h4 { font-size: var(--font-size-xl); }
h5 { font-size: var(--font-size-lg); }
h6 { font-size: var(--font-size-base); }

p {
    margin-bottom: var(--spacing-md);
    color: var(--gray-700);
}

/* Links */
a {
    color: var(--primary-color);
    text-decoration: none;
    transition: color 0.2s ease;
}

a:hover, a:focus {
    color: var(--primary-dark);
    text-decoration: underline;
}

/* Container */
.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

/* Grid System - Mobile First */
.grid {
    display: grid;
    gap: var(--spacing-md);
}

.grid-1 { grid-template-columns: 1fr; }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }

/* Responsive grid adjustments */
@media (min-width: 768px) {
    .md\:grid-2 { grid-template-columns: repeat(2, 1fr); }
    .md\:grid-3 { grid-template-columns: repeat(3, 1fr); }
    .md\:grid-4 { grid-template-columns: repeat(4, 1fr); }
    
    .container {
        padding: 0 var(--spacing-lg);
    }
}

@media (min-width: 1024px) {
    .lg\:grid-3 { grid-template-columns: repeat(3, 1fr); }
    .lg\:grid-4 { grid-template-columns: repeat(4, 1fr); }
    .lg\:grid-5 { grid-template-columns: repeat(5, 1fr); }
    
    .container {
        padding: 0 var(--spacing-xl);
    }
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-sm) var(--spacing-lg);
    font-size: var(--font-size-base);
    font-weight: 500;
    line-height: 1;
    border: var(--border-width) solid transparent;
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: all 0.2s ease;
    text-decoration: none;
    min-height: 44px; /* Touch-friendly */
    gap: var(--spacing-sm);
}

.btn:hover, .btn:focus {
    transform: translateY(-1px);
    box-shadow: var(--shadow-lg);
    text-decoration: none;
}

.btn:active {
    transform: translateY(0);
}

.btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none;
    box-shadow: none;
}

/* Button variants */
.btn-primary {
    background-color: var(--primary-color);
    color: white;
}

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

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

.btn-secondary:hover, .btn-secondary:focus {
    background-color: #047857;
    color: white;
}

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

.btn-danger:hover, .btn-danger:focus {
    background-color: #b91c1c;
    color: white;
}

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

.btn-outline:hover, .btn-outline:focus {
    background-color: var(--primary-color);
    color: white;
}

/* Button sizes */
.btn-sm {
    padding: var(--spacing-xs) var(--spacing-md);
    font-size: var(--font-size-sm);
    min-height: 36px;
}

.btn-lg {
    padding: var(--spacing-md) var(--spacing-2xl);
    font-size: var(--font-size-lg);
    min-height: 52px;
}

.btn-block {
    width: 100%;
}

/* Forms */
.form-group {
    margin-bottom: var(--spacing-lg);
}

.form-label {
    display: block;
    font-weight: 500;
    margin-bottom: var(--spacing-sm);
    color: var(--gray-700);
}

.form-control {
    display: block;
    width: 100%;
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: var(--font-size-base);
    line-height: 1.5;
    color: var(--gray-700);
    background-color: white;
    background-clip: padding-box;
    border: var(--border-width) solid var(--gray-300);
    border-radius: var(--border-radius);
    transition: border-color 0.2s ease, box-shadow 0.2s ease;
    min-height: 44px; /* Touch-friendly */
}

.form-control:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(30, 64, 175, 0.1);
}

.form-control:invalid {
    border-color: var(--danger-color);
}

/* Cards */
.card {
    background-color: white;
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow);
    overflow: hidden;
    transition: box-shadow 0.2s ease, transform 0.2s ease;
}

.card:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-2px);
}

.card-header {
    padding: var(--spacing-lg);
    background-color: var(--gray-50);
    border-bottom: var(--border-width) solid var(--gray-200);
}

.card-body {
    padding: var(--spacing-lg);
}

.card-footer {
    padding: var(--spacing-lg);
    background-color: var(--gray-50);
    border-top: var(--border-width) solid var(--gray-200);
}

/* Alerts */
.alert {
    padding: var(--spacing-md) var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
    border: var(--border-width) solid transparent;
    border-radius: var(--border-radius);
    font-weight: 500;
}

.alert-success {
    color: #065f46;
    background-color: #d1fae5;
    border-color: #a7f3d0;
}

.alert-error {
    color: #991b1b;
    background-color: #fee2e2;
    border-color: #fecaca;
}

.alert-warning {
    color: #92400e;
    background-color: #fef3c7;
    border-color: #fde68a;
}

.alert-info {
    color: #1e40af;
    background-color: #dbeafe;
    border-color: #93c5fd;
}

/* Tables */
.table-container {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
}

.table {
    width: 100%;
    border-collapse: collapse;
    background-color: white;
}

.table th,
.table td {
    padding: var(--spacing-sm) var(--spacing-md);
    text-align: left;
    border-bottom: var(--border-width) solid var(--gray-200);
}

.table th {
    font-weight: 600;
    color: var(--gray-900);
    background-color: var(--gray-50);
}

.table tbody tr:hover {
    background-color: var(--gray-50);
}

/* Mobile Header */
.mobile-header {
    background-color: white;
    box-shadow: var(--shadow);
    position: sticky;
    top: 0;
    z-index: 100;
    padding: var(--spacing-md);
}

.header-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    max-width: 1200px;
    margin: 0 auto;
}

.header-content h1 {
    font-size: var(--font-size-2xl);
    margin: 0;
    color: var(--primary-color);
}

.user-info {
    display: flex;
    flex-direction: column;
    align-items: flex-end;
    font-size: var(--font-size-sm);
}

.user-name {
    font-weight: 600;
    color: var(--gray-900);
}

.user-role {
    color: var(--gray-500);
    text-transform: capitalize;
}

/* Navigation Grid */
.main-nav {
    padding: var(--spacing-lg);
    max-width: 1200px;
    margin: 0 auto;
}

.nav-grid {
    display: grid;
    gap: var(--spacing-xl);
}

.nav-section {
    margin-bottom: var(--spacing-lg);
}

.nav-section h2 {
    font-size: var(--font-size-xl);
    margin-bottom: var(--spacing-lg);
    color: var(--gray-900);
    border-bottom: 2px solid var(--gray-200);
    padding-bottom: var(--spacing-sm);
}

.nav-cards {
    display: grid;
    gap: var(--spacing-md);
    grid-template-columns: 1fr;
}

@media (min-width: 640px) {
    .nav-cards {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (min-width: 1024px) {
    .nav-cards {
        grid-template-columns: repeat(3, 1fr);
    }
}

/* Navigation Cards */
.nav-card {
    display: flex;
    align-items: center;
    padding: var(--spacing-lg);
    background-color: white;
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow);
    text-decoration: none;
    color: inherit;
    transition: all 0.2s ease;
    min-height: 80px;
    border: var(--border-width) solid transparent;
}

.nav-card:hover, .nav-card:focus {
    transform: translateY(-2px);
    box-shadow: var(--shadow-xl);
    text-decoration: none;
    border-color: var(--primary-color);
}

.nav-card.primary {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    color: white;
}

.nav-card.primary:hover {
    border-color: transparent;
}

.nav-card.alert {
    border-color: var(--warning-color);
    background-color: #fefbf3;
}

.nav-icon {
    font-size: var(--font-size-3xl);
    margin-right: var(--spacing-lg);
    flex-shrink: 0;
}

.nav-content h3 {
    font-size: var(--font-size-lg);
    font-weight: 600;
    margin: 0 0 var(--spacing-xs) 0;
}

.nav-content p {
    font-size: var(--font-size-sm);
    margin: 0;
    color: var(--gray-600);
}

.nav-card.primary .nav-content p {
    color: rgba(255, 255, 255, 0.8);
}

/* Mobile Footer */
.mobile-footer {
    background-color: white;
    border-top: var(--border-width) solid var(--gray-200);
    padding: var(--spacing-lg);
    margin-top: var(--spacing-2xl);
}

.footer-actions {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
    align-items: center;
    max-width: 1200px;
    margin: 0 auto;
}

@media (min-width: 640px) {
    .footer-actions {
        flex-direction: row;
        justify-content: space-between;
    }
}

.logout-btn {
    background-color: var(--danger-color);
    color: white;
    padding: var(--spacing-sm) var(--spacing-lg);
    border-radius: var(--border-radius);
    text-decoration: none;
    font-weight: 500;
    transition: all 0.2s ease;
}

.logout-btn:hover, .logout-btn:focus {
    background-color: #b91c1c;
    color: white;
    text-decoration: none;
}

.system-info {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-xs);
    font-size: var(--font-size-sm);
    color: var(--gray-500);
}

@media (min-width: 640px) {
    .system-info {
        align-items: flex-end;
    }
}

/* Utility Classes */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

.font-bold { font-weight: 700; }
.font-semibold { font-weight: 600; }
.font-medium { font-weight: 500; }

.text-primary { color: var(--primary-color); }
.text-secondary { color: var(--secondary-color); }
.text-danger { color: var(--danger-color); }
.text-warning { color: var(--warning-color); }
.text-muted { color: var(--gray-500); }

.bg-primary { background-color: var(--primary-color); }
.bg-secondary { background-color: var(--secondary-color); }
.bg-gray-50 { background-color: var(--gray-50); }
.bg-white { background-color: white; }

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

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

.p-0 { padding: 0; }
.p-1 { padding: var(--spacing-sm); }
.p-2 { padding: var(--spacing-md); }
.p-3 { padding: var(--spacing-lg); }
.p-4 { padding: var(--spacing-xl); }

.hidden { display: none; }
.block { display: block; }
.inline-block { display: inline-block; }
.flex { display: flex; }
.grid { display: grid; }

.items-center { align-items: center; }
.justify-center { justify-content: center; }
.justify-between { justify-content: space-between; }

.w-full { width: 100%; }
.h-full { height: 100%; }

/* Loading States */
.loading {
    opacity: 0.6;
    pointer-events: none;
    position: relative;
}

.loading::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 20px;
    height: 20px;
    margin: -10px 0 0 -10px;
    border: 2px solid var(--gray-300);
    border-top: 2px solid var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* ================================================
   Feedback Visual - Loading / Toast / Spinner
   ================================================ */

/* --- Spinner overlay de página completa --- */
#page-loading-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(255,255,255,0.75);
    z-index: 9999;
    align-items: center;
    justify-content: center;
    flex-direction: column;
    gap: 12px;
    backdrop-filter: blur(2px);
}
#page-loading-overlay.active {
    display: flex;
}
#page-loading-overlay .plo-spinner {
    width: 44px;
    height: 44px;
    border: 4px solid var(--gray-200);
    border-top-color: var(--primary-color);
    border-radius: 50%;
    animation: plo-spin 0.7s linear infinite;
}
#page-loading-overlay .plo-text {
    font-size: 14px;
    font-weight: 600;
    color: var(--gray-700);
    letter-spacing: 0.01em;
}
@keyframes plo-spin {
    to { transform: rotate(360deg); }
}

/* --- Botón en estado loading --- */
.btn-loading,
button.btn-loading {
    opacity: 0.75;
    pointer-events: none;
    position: relative;
    padding-left: 2.4em;
}
.btn-loading::before {
    content: '';
    position: absolute;
    left: 0.7em;
    top: 50%;
    transform: translateY(-50%);
    width: 1em;
    height: 1em;
    border: 2px solid rgba(255,255,255,0.4);
    border-top-color: #fff;
    border-radius: 50%;
    animation: plo-spin 0.6s linear infinite;
}
/* Para botones con fondo claro */
.btn-loading.btn-light-spinner::before,
.btn-loading.btn-secondary::before {
    border-color: rgba(0,0,0,0.15);
    border-top-color: var(--gray-700);
}

/* --- Toast notifications --- */
.toast-container {
    position: fixed;
    bottom: 24px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 10000;
    display: flex;
    flex-direction: column;
    gap: 8px;
    align-items: center;
    pointer-events: none;
    width: min(420px, 92vw);
}
.toast {
    display: flex;
    align-items: flex-start;
    gap: 10px;
    padding: 12px 16px;
    border-radius: 10px;
    background: #fff;
    box-shadow: 0 4px 20px rgba(0,0,0,0.15);
    font-size: 14px;
    line-height: 1.4;
    opacity: 0;
    transform: translateY(12px);
    transition: opacity 0.25s ease, transform 0.25s ease;
    pointer-events: auto;
    width: 100%;
    border-left: 4px solid var(--gray-300);
}
.toast.show {
    opacity: 1;
    transform: translateY(0);
}
.toast-success { border-left-color: var(--secondary-color); }
.toast-error   { border-left-color: var(--danger-color); }
.toast-warning { border-left-color: var(--warning-color); }
.toast-info    { border-left-color: var(--primary-color); }
.toast-icon {
    font-size: 18px;
    line-height: 1;
    flex-shrink: 0;
    margin-top: 1px;
}
.toast-message {
    color: var(--gray-800);
    font-weight: 500;
}

/* Print Styles */
@media print {
    .mobile-header,
    .mobile-footer,
    .nav-section,
    .btn {
        display: none !important;
    }
    
    body {
        background-color: white;
    }
    
    .card {
        box-shadow: none;
        border: var(--border-width) solid var(--gray-300);
    }
}