/* =============================================================================
   frontend/css/styles.css
   =============================================================================
   Estilos principales de la plataforma Vision AI.
   
   Tutorial:
   - Usamos CSS Variables (custom properties) para colores consistentes
   - Diseño responsive con CSS Grid y Flexbox
   - Paleta de colores oscura inspirada en interfaces de monitoreo
   ============================================================================= */

/* -----------------------------------------------------------------------------
   Variables CSS / Tema de colores
   ----------------------------------------------------------------------------- */
:root {
    /* Colores principales - Tema oscuro profesional */
    --color-bg-primary: #0a0e17;
    --color-bg-secondary: #111827;
    --color-bg-card: #1a2332;
    --color-bg-input: #0d1321;
    
    /* Colores de acento */
    --color-accent-blue: #3b82f6;
    --color-accent-green: #10b981;
    --color-accent-yellow: #f59e0b;
    --color-accent-red: #ef4444;
    --color-accent-purple: #8b5cf6;
    
    /* Texto */
    --color-text-primary: #f3f4f6;
    --color-text-secondary: #9ca3af;
    --color-text-muted: #6b7280;
    
    /* Bordes y sombras */
    --color-border: #374151;
    --shadow-card: 0 4px 6px -1px rgba(0, 0, 0, 0.3);
    --shadow-hover: 0 10px 15px -3px rgba(0, 0, 0, 0.4);
    
    /* Tipografía */
    --font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
    --font-mono: 'Cascadia Code', 'Fira Code', 'Consolas', monospace;
    
    /* Espaciado */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    
    /* Bordes redondeados */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-full: 9999px;
}

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

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

body {
    font-family: var(--font-family);
    background-color: var(--color-bg-primary);
    color: var(--color-text-primary);
    line-height: 1.6;
    min-height: 100vh;
}

/* -----------------------------------------------------------------------------
   Contenedor principal de la app
   ----------------------------------------------------------------------------- */
#app {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

/* -----------------------------------------------------------------------------
   Header / Cabecera
   ----------------------------------------------------------------------------- */
.header {
    background: linear-gradient(135deg, var(--color-bg-secondary) 0%, var(--color-bg-card) 100%);
    padding: var(--spacing-md) var(--spacing-xl);
    border-bottom: 1px solid var(--color-border);
    text-align: center;
    position: relative;
}

.header h1 {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: var(--spacing-xs);
    background: linear-gradient(90deg, var(--color-accent-blue), var(--color-accent-purple));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.subtitle {
    color: var(--color-text-secondary);
    font-size: 0.85rem;
}

/* Indicador de conexión */
.connection-status {
    position: absolute;
    top: var(--spacing-md);
    right: var(--spacing-xl);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: 0.8rem;
    color: var(--color-text-secondary);
}

.status-dot {
    width: 10px;
    height: 10px;
    border-radius: var(--radius-full);
    transition: background-color 0.3s ease;
}

.status-dot.online {
    background-color: var(--color-accent-green);
    box-shadow: 0 0 8px var(--color-accent-green);
}

.status-dot.offline {
    background-color: var(--color-accent-red);
}

.status-dot.connecting {
    background-color: var(--color-accent-yellow);
    animation: pulse 1s infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

/* -----------------------------------------------------------------------------
   Contenido principal - Layout Grid 3 columnas
   ----------------------------------------------------------------------------- */
.main-content {
    flex: 1;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-md);
    padding: var(--spacing-md) var(--spacing-lg);
    max-width: 1800px;
    margin: 0 auto;
    width: 100%;
}

.main-content.three-columns {
    grid-template-columns: 1.2fr 1fr 1fr;
}

/* -----------------------------------------------------------------------------
   Sección de Video
   ----------------------------------------------------------------------------- */
.video-section {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--spacing-md);
    display: flex;
    flex-direction: column;
}

.video-section h2 {
    font-size: 1rem;
    margin-bottom: var(--spacing-sm);
    color: var(--color-text-primary);
}

.video-container {
    position: relative;
    width: 100%;
    aspect-ratio: 16 / 9;
    background: var(--color-bg-primary);
    border-radius: var(--radius-md);
    overflow: hidden;
}

.video-stream {
    width: 100%;
    height: 100%;
    object-fit: contain;
    background: #000;
}

.video-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(0, 0, 0, 0.8);
}

.video-placeholder {
    text-align: center;
    color: var(--color-text-secondary);
}

.placeholder-icon {
    font-size: 3rem;
    display: block;
    margin-bottom: var(--spacing-md);
}

.placeholder-hint {
    font-size: 0.8rem;
    color: var(--color-text-muted);
    margin-top: var(--spacing-sm);
}

.video-controls {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-top: var(--spacing-sm);
    padding-top: var(--spacing-sm);
    border-top: 1px solid var(--color-border);
}

.btn-control {
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--color-bg-secondary);
    color: var(--color-text-primary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    cursor: pointer;
    font-size: 0.85rem;
    transition: all 0.2s ease;
}

.btn-control:hover {
    background: var(--color-accent-blue);
    border-color: var(--color-accent-blue);
}

.video-status {
    font-size: 0.8rem;
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-sm);
}

.video-status.streaming {
    color: var(--color-accent-green);
}

.video-status.disconnected,
.video-status.error {
    color: var(--color-accent-red);
}

.video-status.connecting,
.video-status.inactive {
    color: var(--color-accent-yellow);
}

/* -----------------------------------------------------------------------------
   Sección de eventos
   ----------------------------------------------------------------------------- */
.events-section {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

/* Tarjetas de estadísticas */
.stats-container {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-sm);
}

.stat-card {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

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

.stat-icon {
    font-size: 1.5rem;
}

.stat-info {
    display: flex;
    flex-direction: column;
}

.stat-number {
    font-size: 1.25rem;
    font-weight: 700;
    font-family: var(--font-mono);
    color: var(--color-accent-blue);
}

.stat-label {
    font-size: 0.75rem;
    color: var(--color-text-secondary);
}

/* -----------------------------------------------------------------------------
   Estadísticas por clase (80 clases COCO)
   ----------------------------------------------------------------------------- */
.class-stats-container {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: var(--spacing-sm);
}

.class-stats-container h3 {
    font-size: 0.85rem;
    margin-bottom: var(--spacing-sm);
    color: var(--color-text-secondary);
    font-weight: 500;
}

.class-stats {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.main-classes {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
}

.class-badge {
    background: var(--color-bg-secondary);
    padding: 4px 8px;
    border-radius: var(--radius-sm);
    font-size: 0.7rem;
    color: var(--color-text-muted);
    border: 1px solid transparent;
    transition: all 0.2s ease;
}

.class-badge.active {
    color: var(--color-text-primary);
    border-color: var(--color-border);
}

.class-badge strong {
    color: var(--color-accent-blue);
    font-weight: 600;
}

.class-badge.active strong {
    color: var(--color-accent-green);
}

.other-classes {
    display: flex;
    flex-wrap: wrap;
    gap: 4px;
    align-items: center;
    margin-top: var(--spacing-xs);
    padding-top: var(--spacing-xs);
    border-top: 1px solid var(--color-border);
}

.other-label {
    font-size: 0.65rem;
    color: var(--color-text-muted);
    margin-right: 4px;
}

.class-badge-small {
    background: var(--color-bg-input);
    padding: 2px 6px;
    border-radius: var(--radius-sm);
    font-size: 0.65rem;
    color: var(--color-text-secondary);
}

.class-badge-small.more {
    background: var(--color-bg-secondary);
    color: var(--color-text-muted);
    font-style: italic;
}

.class-info {
    font-size: 0.65rem;
    color: var(--color-text-muted);
    text-align: right;
    margin-top: var(--spacing-xs);
}

.loading-stats {
    color: var(--color-text-muted);
    font-size: 0.75rem;
    font-style: italic;
    text-align: center;
    padding: var(--spacing-sm);
}

/* Lista de eventos */
.events-list-container {
    flex: 1;
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--spacing-md);
    display: flex;
    flex-direction: column;
    min-height: 300px;
}

.events-list-container h2 {
    font-size: 1rem;
    margin-bottom: var(--spacing-sm);
    color: var(--color-text-primary);
}

.events-list {
    flex: 1;
    overflow-y: auto;
    max-height: 350px;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.no-events {
    color: var(--color-text-muted);
    text-align: center;
    padding: var(--spacing-lg);
    font-style: italic;
    font-size: 0.9rem;
}

/* Estilo de cada evento individual */
.event-item {
    background: var(--color-bg-secondary);
    border-radius: var(--radius-sm);
    padding: var(--spacing-sm);
    border-left: 3px solid var(--color-accent-blue);
    animation: slideIn 0.3s ease;
    font-size: 0.85rem;
}

.event-item.vehicle {
    border-left-color: var(--color-accent-green);
}

.event-item.person {
    border-left-color: var(--color-accent-yellow);
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateX(-10px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

.event-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.event-class {
    font-weight: 600;
    text-transform: capitalize;
}

.event-time {
    font-size: 0.7rem;
    color: var(--color-text-muted);
    font-family: var(--font-mono);
}

.event-details {
    font-size: 0.75rem;
    color: var(--color-text-secondary);
}

/* -----------------------------------------------------------------------------
   Sección de chat
   ----------------------------------------------------------------------------- */
.chat-section {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--spacing-md);
    display: flex;
    flex-direction: column;
}

.chat-section h2 {
    font-size: 1rem;
    margin-bottom: var(--spacing-xs);
}

.chat-description {
    font-size: 0.8rem;
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-sm);
}

/* Contenedor de mensajes */
.chat-messages {
    flex: 1;
    overflow-y: auto;
    max-height: 400px;
    min-height: 250px;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm);
    background: var(--color-bg-input);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-sm);
}

.chat-welcome {
    text-align: center;
    color: var(--color-text-secondary);
    padding: var(--spacing-lg);
    font-size: 0.85rem;
}

.chat-welcome p {
    margin-bottom: var(--spacing-xs);
}

/* Mensajes individuales */
.chat-message {
    max-width: 90%;
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-md);
    line-height: 1.4;
    font-size: 0.85rem;
}

.chat-message.user {
    align-self: flex-end;
    background: var(--color-accent-blue);
    color: white;
    border-bottom-right-radius: var(--spacing-xs);
}

.chat-message.assistant {
    align-self: flex-start;
    background: var(--color-bg-secondary);
    border: 1px solid var(--color-border);
    border-bottom-left-radius: var(--spacing-xs);
}

.chat-message.loading {
    color: var(--color-text-muted);
    font-style: italic;
}

/* Formulario del chat */
.chat-form {
    display: flex;
    gap: var(--spacing-sm);
}

.chat-form input {
    flex: 1;
    padding: var(--spacing-sm) var(--spacing-md);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    background: var(--color-bg-input);
    color: var(--color-text-primary);
    font-size: 0.9rem;
    transition: border-color 0.2s ease;
}

.chat-form input:focus {
    outline: none;
    border-color: var(--color-accent-blue);
}

.chat-form input::placeholder {
    color: var(--color-text-muted);
}

.chat-form button {
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--color-accent-blue);
    color: white;
    border: none;
    border-radius: var(--radius-md);
    font-weight: 600;
    cursor: pointer;
    font-size: 0.85rem;
    transition: background-color 0.2s ease, transform 0.1s ease;
}

.chat-form button:hover {
    background: #2563eb;
}

.chat-form button:active {
    transform: scale(0.98);
}

.chat-form button:disabled {
    background: var(--color-text-muted);
    cursor: not-allowed;
}

/* -----------------------------------------------------------------------------
   Footer
   ----------------------------------------------------------------------------- */
.footer {
    background: var(--color-bg-secondary);
    border-top: 1px solid var(--color-border);
    padding: var(--spacing-sm) var(--spacing-xl);
    text-align: center;
    font-size: 0.8rem;
    color: var(--color-text-muted);
}

/* -----------------------------------------------------------------------------
   Responsive - Pantallas medianas
   ----------------------------------------------------------------------------- */
@media (max-width: 1200px) {
    .main-content.three-columns {
        grid-template-columns: 1fr 1fr;
    }
    
    .video-section {
        grid-column: span 2;
    }
}

/* -----------------------------------------------------------------------------
   Responsive - Pantallas pequeñas
   ----------------------------------------------------------------------------- */
@media (max-width: 768px) {
    .header h1 {
        font-size: 1.25rem;
    }
    
    .connection-status {
        position: static;
        justify-content: center;
        margin-top: var(--spacing-sm);
    }
    
    .main-content,
    .main-content.three-columns {
        grid-template-columns: 1fr;
        padding: var(--spacing-sm);
    }
    
    .video-section {
        grid-column: span 1;
    }
    
    .stats-container {
        grid-template-columns: 1fr;
    }
}

/* -----------------------------------------------------------------------------
   Scrollbar personalizado (navegadores Webkit)
   ----------------------------------------------------------------------------- */
::-webkit-scrollbar {
    width: 6px;
    height: 6px;
}

::-webkit-scrollbar-track {
    background: var(--color-bg-secondary);
    border-radius: var(--radius-full);
}

::-webkit-scrollbar-thumb {
    background: var(--color-border);
    border-radius: var(--radius-full);
}

::-webkit-scrollbar-thumb:hover {
    background: var(--color-text-muted);
}