/**
 * styles.css - Estilos responsive para todo el sistema
 * 
 * Diseño:
 * - Mobile-first
 * - Variables CSS para tema
 * - Sin frameworks externos
 */

/* ============================================
   VARIABLES Y RESET
   ============================================ */
:root {
    /* Colores principales */
    --primary: #2563eb;
    --primary-dark: #1d4ed8;
    --primary-light: #3b82f6;
    --secondary: #6b7280;
    --secondary-dark: #4b5563;
    --success: #10b981;
    --warning: #f59e0b;
    --danger: #ef4444;
    --danger-dark: #dc2626;
    
    /* Colores neutros */
    --background: #f9fafb;
    --surface: #ffffff;
    --text: #111827;
    --text-light: #6b7280;
    --border: #e5e7eb;
    
    /* Espaciado */
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;
    
    /* Tamaños */
    --sidebar-width: 280px;
    --header-height: 64px;
    --border-radius: 8px;
    
    /* Sombras */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
    background-color: var(--background);
    color: var(--text);
    line-height: 1.5;
}

/* ============================================
   TIPOGRAFÍA
   ============================================ */
h1 {
    font-size: 2rem;
    margin-bottom: var(--spacing-lg);
    color: var(--text);
}

h2 {
    font-size: 1.5rem;
    margin-bottom: var(--spacing-md);
    color: var(--text);
}

h3 {
    font-size: 1.25rem;
    margin-bottom: var(--spacing-sm);
    color: var(--text);
}

p {
    margin-bottom: var(--spacing-sm);
}

a {
    color: var(--primary);
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
}

/* ============================================
   LAYOUT GENERAL
   ============================================ */
.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

/* ============================================
   NAVBAR
   ============================================ */
.navbar {
    background-color: var(--surface);
    border-bottom: 1px solid var(--border);
    position: sticky;
    top: 0;
    z-index: 100;
    height: var(--header-height);
}

.nav-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.nav-brand {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--primary);
    text-decoration: none;
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.nav-link {
    color: var(--text-light);
    text-decoration: none;
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--border-radius);
    transition: background-color 0.2s;
}

.nav-link:hover {
    background-color: var(--background);
    text-decoration: none;
}

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

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

.nav-user {
    font-weight: 500;
    padding: var(--spacing-sm) var(--spacing-md);
}

/* ============================================
   BOTONES
   ============================================ */
.btn {
    display: inline-block;
    padding: var(--spacing-sm) var(--spacing-lg);
    border: none;
    border-radius: var(--border-radius);
    font-size: 0.875rem;
    font-weight: 500;
    text-decoration: none;
    cursor: pointer;
    transition: all 0.2s;
}

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

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

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

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

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

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

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

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

.btn-block {
    display: block;
    width: 100%;
}

.btn-large {
    padding: var(--spacing-md) var(--spacing-xl);
    font-size: 1rem;
}

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

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

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: var(--spacing-sm) var(--spacing-md);
    border: 1px solid var(--border);
    border-radius: var(--border-radius);
    font-size: 1rem;
    transition: border-color 0.2s;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.form-group small {
    display: block;
    margin-top: var(--spacing-xs);
    color: var(--text-light);
    font-size: 0.875rem;
}

.form-group textarea {
    resize: vertical;
    min-height: 80px;
}

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

.alert-success {
    background-color: #d1fae5;
    color: #065f46;
    border: 1px solid #a7f3d0;
}

.alert-error {
    background-color: #fee2e2;
    color: #991b1b;
    border: 1px solid #fecaca;
}

.alert-warning {
    background-color: #fff3cd;
    color: #856404;
    border: 1px solid #ffeeba;
}

/* ============================================
   TABLAS
   ============================================ */
.table {
    width: 100%;
    border-collapse: collapse;
    margin-bottom: var(--spacing-lg);
    background-color: var(--surface);
    border-radius: var(--border-radius);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
}

.table thead {
    background-color: var(--background);
    border-bottom: 2px solid var(--border);
}

.table th {
    text-align: left;
    padding: var(--spacing-md);
    font-weight: 600;
    color: var(--text);
}

.table td {
    padding: var(--spacing-md);
    border-bottom: 1px solid var(--border);
}

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

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

/* ============================================
   BADGES
   ============================================ */
.badge {
    display: inline-block;
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: 9999px;
    font-size: 0.75rem;
    font-weight: 500;
    text-transform: uppercase;
}

.badge-pending {
    background-color: #fef3c7;
    color: #92400e;
}

.badge-processing {
    background-color: #dbeafe;
    color: #1e40af;
}

.badge-completed {
    background-color: #d1fae5;
    color: #065f46;
}

.badge-error {
    background-color: #fee2e2;
    color: #991b1b;
}

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

.stat-card {
    background-color: var(--surface);
    border-radius: var(--border-radius);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-md);
    transition: transform 0.2s;
}

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

.stat-value {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--primary);
    margin-bottom: var(--spacing-xs);
    line-height: 1;
}

.stat-label {
    color: var(--text-light);
    font-size: 0.875rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.stat-detail {
    margin-top: var(--spacing-sm);
    font-size: 0.875rem;
}

/* ============================================
   DASHBOARD GRID
   ============================================ */
.dashboard-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-lg);
    margin-top: var(--spacing-xl);
}

.dashboard-card {
    background-color: var(--surface);
    border-radius: var(--border-radius);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-md);
}

/* ============================================
   CHAT INTERFACE
   ============================================ */
.chat-page {
    height: 100vh;
    overflow: hidden;
}

.chat-container {
    display: flex;
    height: 100vh;
}

/* Sidebar */
.chat-sidebar {
    width: var(--sidebar-width);
    background-color: var(--surface);
    border-right: 1px solid var(--border);
    display: flex;
    flex-direction: column;
}

.sidebar-header {
    padding: var(--spacing-lg);
    border-bottom: 1px solid var(--border);
}

.sidebar-header h2 {
    color: var(--primary);
    margin-bottom: var(--spacing-xs);
    font-size: 1.5rem;
}

.category-filter {
    padding: var(--spacing-md) var(--spacing-lg);
    border-bottom: 1px solid var(--border);
}

.category-select {
    width: 100%;
    margin-top: var(--spacing-xs);
    padding: var(--spacing-sm);
    border: 1px solid var(--border);
    border-radius: var(--border-radius);
}

.conversations-list {
    flex: 1;
    overflow-y: auto;
    padding: var(--spacing-md) 0;
}

.conversation-item {
    padding: var(--spacing-md) var(--spacing-lg);
    cursor: pointer;
    transition: background-color 0.2s;
    border-left: 3px solid transparent;
}

.conversation-item:hover {
    background-color: var(--background);
}

.conversation-item.active {
    background-color: #e0f2fe;
    border-left-color: var(--primary);
}

.conv-title {
    font-weight: 500;
    margin-bottom: var(--spacing-xs);
    font-size: 0.875rem;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.conv-date {
    font-size: 0.75rem;
    color: var(--text-light);
}

.sidebar-footer {
    padding: var(--spacing-lg);
    border-top: 1px solid var(--border);
}

/* Chat main area */
.chat-main {
    flex: 1;
    display: flex;
    flex-direction: column;
    background-color: var(--background);
}

.messages-container {
    flex: 1;
    overflow-y: auto;
    padding: var(--spacing-xl);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

.message {
    display: flex;
    flex-direction: column;
    max-width: 80%;
    animation: fadeIn 0.3s;
}

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

.message.user {
    align-self: flex-end;
}

.message.assistant {
    align-self: flex-start;
}

.message-content {
    padding: var(--spacing-md) var(--spacing-lg);
    border-radius: var(--border-radius);
    background-color: var(--surface);
    box-shadow: var(--shadow-sm);
    line-height: 1.6;
}

.message.user .message-content {
    background-color: var(--primary);
    color: white;
}

.message-sources {
    margin-top: var(--spacing-md);
    padding-top: var(--spacing-md);
    border-top: 1px solid var(--border);
    font-size: 0.875rem;
}

.message.user .message-sources {
    border-top-color: rgba(255,255,255,0.2);
}

.message-sources ul {
    margin-top: var(--spacing-xs);
    padding-left: var(--spacing-lg);
    color: var(--text-light);
}

.message.user .message-sources ul {
    color: rgba(255,255,255,0.9);
}

.source-link {
    margin-left: var(--spacing-xs);
    opacity: 0.7;
    transition: opacity 0.2s;
}

.source-link:hover {
    opacity: 1;
    text-decoration: none;
}

.message-time {
    font-size: 0.75rem;
    color: var(--text-light);
    margin-top: var(--spacing-xs);
    align-self: flex-start;
}

.message.user .message-time {
    align-self: flex-end;
}

/* Input area */
.input-container {
    padding: var(--spacing-lg);
    background-color: var(--surface);
    border-top: 1px solid var(--border);
    display: flex;
    gap: var(--spacing-md);
}

.input-container textarea {
    flex: 1;
    padding: var(--spacing-md);
    border: 1px solid var(--border);
    border-radius: var(--border-radius);
    resize: none;
    font-family: inherit;
    font-size: 0.875rem;
    line-height: 1.5;
    max-height: 150px;
}

.input-container textarea:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(37,99,235,0.1);
}

/* Typing indicator */
.typing-indicator {
    padding: var(--spacing-md) var(--spacing-xl);
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    color: var(--text-light);
    font-size: 0.875rem;
}

.typing-indicator span {
    width: 8px;
    height: 8px;
    background-color: var(--primary);
    border-radius: 50%;
    display: inline-block;
    animation: typing 1.4s infinite ease-in-out;
}

.typing-indicator span:nth-child(2) {
    animation-delay: 0.2s;
}

.typing-indicator span:nth-child(3) {
    animation-delay: 0.4s;
}

@keyframes typing {
    0%, 60%, 100% {
        transform: translateY(0);
        opacity: 0.4;
    }
    30% {
        transform: translateY(-10px);
        opacity: 1;
    }
}

/* Suggestions */
.suggestions {
    padding: 0 var(--spacing-lg) var(--spacing-lg) var(--spacing-lg);
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: var(--spacing-sm);
}

.suggestion-label {
    color: var(--text-light);
    font-size: 0.875rem;
    margin-right: var(--spacing-xs);
}

.suggestion-chip {
    background-color: var(--surface);
    border: 1px solid var(--border);
    border-radius: 9999px;
    padding: var(--spacing-xs) var(--spacing-md);
    font-size: 0.875rem;
    color: var(--text);
    cursor: pointer;
    transition: all 0.2s;
}

.suggestion-chip:hover {
    background-color: var(--primary);
    color: white;
    border-color: var(--primary);
}

/* ============================================
   LOGIN PAGE
   ============================================ */
.login-page {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
}

.login-container {
    width: 100%;
    max-width: 400px;
    padding: var(--spacing-lg);
}

.login-box {
    background: var(--surface);
    border-radius: var(--border-radius);
    padding: var(--spacing-xl);
    box-shadow: var(--shadow-lg);
}

.login-box h1 {
    color: var(--primary);
    text-align: center;
    margin-bottom: var(--spacing-xs);
}

.login-box .subtitle {
    color: var(--text-light);
    text-align: center;
    margin-bottom: var(--spacing-xl);
}

.login-footer {
    margin-top: var(--spacing-xl);
    text-align: center;
    color: var(--text-light);
    font-size: 0.875rem;
}

/* ============================================
   UPLOAD PAGE
   ============================================ */
.upload-form-container {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: var(--spacing-xl);
    margin-top: var(--spacing-lg);
}

.upload-form {
    background-color: var(--surface);
    padding: var(--spacing-xl);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-md);
}

.file-input-wrapper {
    border: 2px dashed var(--border);
    padding: var(--spacing-lg);
    text-align: center;
    border-radius: var(--border-radius);
    background-color: var(--background);
}

.file-input-wrapper input[type="file"] {
    margin-bottom: var(--spacing-md);
}

.file-info {
    color: var(--text-light);
    font-size: 0.875rem;
}

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

.upload-info {
    background-color: var(--surface);
    padding: var(--spacing-xl);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-md);
    height: fit-content;
}

.upload-info ul {
    padding-left: var(--spacing-lg);
    margin-top: var(--spacing-md);
}

.upload-info li {
    margin-bottom: var(--spacing-sm);
}

/* ============================================
   ACTIVITY CHART
   ============================================ */
.activity-chart {
    margin-top: var(--spacing-lg);
    min-height: 200px;
}

.chart-bars {
    display: flex;
    align-items: flex-end;
    justify-content: space-around;
    height: 200px;
    gap: var(--spacing-sm);
    padding: var(--spacing-md) 0;
}

.chart-bar-container {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    height: 100%;
}

.chart-bar {
    width: 100%;
    background-color: var(--primary);
    border-radius: var(--border-radius) var(--border-radius) 0 0;
    transition: height 0.3s;
    min-height: 4px;
}

.chart-label {
    margin-top: var(--spacing-xs);
    font-size: 0.75rem;
    color: var(--text-light);
    transform: rotate(-45deg);
    white-space: nowrap;
}

/* ============================================
   RECENT QUERIES
   ============================================ */
.recent-queries {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
    max-height: 400px;
    overflow-y: auto;
}

.query-item {
    padding: var(--spacing-md);
    background-color: var(--background);
    border-radius: var(--border-radius);
    border-left: 3px solid var(--primary);
}

.query-header {
    display: flex;
    justify-content: space-between;
    margin-bottom: var(--spacing-xs);
    font-size: 0.875rem;
}

.query-user {
    font-weight: 500;
}

.query-date {
    color: var(--text-light);
}

.query-text {
    font-size: 0.875rem;
    color: var(--text);
}

/* ============================================
   RESPONSIVE DESIGN
   ============================================ */
@media (max-width: 1024px) {
    .dashboard-grid {
        grid-template-columns: 1fr;
    }
    
    .upload-form-container {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .chat-sidebar {
        display: none;
    }
    
    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .message {
        max-width: 90%;
    }
    
    .nav-menu {
        gap: var(--spacing-xs);
    }
    
    .nav-link {
        padding: var(--spacing-xs) var(--spacing-sm);
        font-size: 0.875rem;
    }
    
    .nav-user {
        display: none;
    }
}

@media (max-width: 480px) {
    .stats-grid {
        grid-template-columns: 1fr;
    }
    
    .container {
        padding: 0 var(--spacing-md);
    }
    
    .login-box {
        padding: var(--spacing-lg);
    }
    
    .table {
        font-size: 0.875rem;
    }
    
    .table th,
    .table td {
        padding: var(--spacing-sm);
    }
    
    .form-actions {
        flex-direction: column;
    }
    
    .btn-block-mobile {
        width: 100%;
    }
    
    .suggestions {
        display: none;
    }
}

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

.mt-2 {
    margin-top: var(--spacing-md);
}

.mb-2 {
    margin-bottom: var(--spacing-md);
}

.hidden {
    display: none;
}

/* Scrollbar personalizada */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: var(--background);
}

::-webkit-scrollbar-thumb {
    background: var(--secondary);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--secondary-dark);
}