:root {
    --bg-main: #212121;
    --bg-surface: #171717;
    --bg-card: #2f2f2f;
    --bg-input: #2f2f2f;
    --bg-hover: #383838;
    
    --border-color: #3e3e3e;
    --border-light: #424242;
    
    --text-primary: #ececec;
    --text-secondary: #b4b4b4;
    --text-muted: #8e8e8e;
    
    --accent-blue: #10a37f;
    --accent-blue-hover: #1a7f64;
    
    --danger: #ef4444;
    --danger-bg: rgba(239, 68, 68, 0.1);
    --success: #10b981;
    --warning: #f59e0b;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

body {
    background-color: var(--bg-surface);
    color: var(--text-primary);
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    overflow: hidden;
}

.app-container {
    width: 100%;
    max-width: 720px;
    height: 100vh;
    background-color: var(--bg-main);
    display: flex;
    flex-direction: column;
    position: relative;
    overflow: hidden;
}

@media (min-width: 640px) {
    .app-container {
        height: 90vh;
        border-radius: 12px;
        border: 1px solid var(--border-color);
    }
}

/* Animaciones */
.fade-in {
    animation: fadeIn 0.3s ease-out forwards;
}

.slide-up {
    animation: slideUp 0.25s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

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

/* Animación para mensajes */
.message-send-anim {
    animation: messagePopIn 0.25s cubic-bezier(0.175, 0.885, 0.32, 1.275) forwards;
}

@keyframes messagePopIn {
    0% {
        opacity: 0;
        transform: translateY(12px) scale(0.96);
    }
    100% {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

/* Header Principal */
.main-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.85rem 1.25rem;
    background-color: var(--bg-main);
    border-bottom: 1px solid var(--border-color);
    z-index: 5;
}

.header-title h1 {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-primary);
    letter-spacing: -0.3px;
}

/* Indicador de Estado */
.status-badge {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.75rem;
    padding: 0.3rem 0.65rem;
    border-radius: 20px;
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
}

.status-dot {
    width: 7px;
    height: 7px;
    border-radius: 50%;
    background-color: var(--text-muted);
}

.status-badge.connected {
    border-color: rgba(16, 185, 129, 0.3);
    color: var(--success);
}
.status-badge.connected .status-dot {
    background-color: var(--success);
}

.status-badge.connecting {
    border-color: rgba(245, 158, 11, 0.3);
    color: var(--warning);
}
.status-badge.connecting .status-dot {
    background-color: var(--warning);
}

.status-badge.error {
    border-color: rgba(239, 68, 68, 0.3);
    color: var(--danger);
}
.status-badge.error .status-dot {
    background-color: var(--danger);
}

/* Estructura de Secciones */
.view-section {
    flex: 1;
    display: flex;
    flex-direction: column;
    padding: 1.25rem;
    gap: 1.25rem;
    overflow-y: auto;
}

.hidden { display: none !important; }

/* Tarjetas */
.card {
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 10px;
    padding: 1.25rem;
}

.card-header {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: 0.85rem;
}

.card-icon { font-size: 1rem; }

.card-header h2 {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

/* Formularios e Inputs */
.input-group {
    display: flex;
    gap: 0.5rem;
}

input[type="text"] {
    flex: 1;
    padding: 0.7rem 0.9rem;
    border-radius: 8px;
    border: 1px solid var(--border-color);
    background-color: var(--bg-surface);
    color: var(--text-primary);
    font-size: 0.9rem;
    outline: none;
    transition: border-color 0.2s ease;
}

input[type="text"]:focus {
    border-color: var(--text-secondary);
}

/* Botones */
button {
    cursor: pointer;
    border: none;
    border-radius: 8px;
    padding: 0.65rem 1rem;
    font-size: 0.85rem;
    font-weight: 500;
    transition: background-color 0.15s ease, transform 0.1s ease;
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

button:active {
    transform: scale(0.98);
}

.primary-btn {
    background-color: var(--text-primary);
    color: var(--bg-surface);
}

.primary-btn:hover {
    background-color: #ffffff;
}

.secondary-btn {
    background-color: var(--bg-card);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

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

.danger-btn {
    background-color: var(--danger-bg);
    color: var(--danger);
    border: 1px solid rgba(239, 68, 68, 0.2);
}

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

.icon-button {
    background: transparent;
    color: var(--text-secondary);
    font-size: 1.1rem;
    padding: 0.4rem 0.6rem;
    border-radius: 6px;
}

.icon-button:hover {
    background-color: var(--bg-hover);
    color: var(--text-primary);
}

.full-width { width: 100%; }

/* Header de Chat */
.chat-header {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding-bottom: 0.85rem;
    border-bottom: 1px solid var(--border-color);
}

.chat-title-group { flex: 1; }
.chat-title-group h2 { font-size: 0.95rem; font-weight: 600; }
.connection-state { font-size: 0.75rem; color: var(--text-muted); }

.chat-actions {
    display: flex;
    gap: 0.5rem;
}

/* Mensajes */
.message-list {
    flex: 1;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: 1rem;
    padding-right: 0.2rem;
}

.message-bubble {
    max-width: 85%;
    padding: 0.75rem 1rem;
    border-radius: 10px;
    word-break: break-word;
    display: flex;
    flex-direction: column;
    font-size: 0.9rem;
    line-height: 1.45;
}

.message-bubble.local {
    align-self: flex-end;
    background-color: var(--bg-card);
    border: 1px solid var(--border-light);
    color: var(--text-primary);
}

.message-bubble.remote {
    align-self: flex-start;
    background-color: var(--bg-surface);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
}

.message-time {
    font-size: 0.65rem;
    color: var(--text-muted);
    align-self: flex-end;
    margin-top: 0.4rem;
}

.system-message {
    align-self: center;
    font-size: 0.75rem;
    color: var(--text-muted);
    background-color: var(--bg-surface);
    border: 1px solid var(--border-color);
    padding: 0.3rem 0.75rem;
    border-radius: 12px;
}

/* Archivos en Mensajes */
.file-download-box {
    background-color: var(--bg-main);
    padding: 0.6rem;
    border-radius: 6px;
    margin-bottom: 0.35rem;
    border: 1px solid var(--border-color);
}

.file-info-row {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.file-download-name {
    font-weight: 500;
    font-size: 0.85rem;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    max-width: 200px;
}

.download-link-btn {
    display: inline-block;
    margin-top: 0.35rem;
    font-size: 0.75rem;
    color: var(--text-secondary);
    text-decoration: underline;
}

.download-link-btn:hover {
    color: var(--text-primary);
}

.image-preview {
    max-width: 100%;
    max-height: 220px;
    border-radius: 6px;
    margin-bottom: 0.4rem;
    object-fit: cover;
}

/* Input y Preview de Adjunto */
.chat-form {
    display: flex;
    gap: 0.5rem;
    align-items: center;
}

.file-preview-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    background-color: var(--bg-card);
    padding: 0.5rem 0.85rem;
    border-radius: 8px;
    border: 1px solid var(--border-color);
}

.file-info {
    display: flex;
    align-items: center;
    gap: 0.6rem;
}

.file-details {
    display: flex;
    flex-direction: column;
    font-size: 0.8rem;
}

#fileSizeDisplay {
    font-size: 0.7rem;
    color: var(--text-muted);
}

/* Sidebar e Historial */
.sidebar-overlay {
    position: absolute;
    inset: 0;
    background-color: rgba(0, 0, 0, 0.5);
    z-index: 10;
}

.sidebar {
    position: absolute;
    top: 0;
    left: 0;
    bottom: 0;
    width: 260px;
    background-color: var(--bg-surface);
    border-right: 1px solid var(--border-color);
    z-index: 20;
    display: flex;
    flex-direction: column;
}

.sidebar-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 1.25rem;
    border-bottom: 1px solid var(--border-color);
}

.sidebar-header h2 { font-size: 0.95rem; }

.recent-chats-list {
    flex: 1;
    overflow-y: auto;
    padding: 0.5rem;
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}

.recent-chat-item {
    padding: 0.65rem 0.75rem;
    border-radius: 6px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    cursor: pointer;
    transition: background-color 0.15s ease;
}

.recent-chat-item:hover {
    background-color: var(--bg-hover);
}

.recent-chat-id { font-weight: 500; font-size: 0.85rem; }
.recent-chat-meta { font-size: 0.7rem; color: var(--text-muted); }

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

.empty-history {
    text-align: center;
    color: var(--text-muted);
    font-size: 0.8rem;
    padding: 2rem 1rem;
}

/* Modal Personalizado */
.modal-overlay {
    position: absolute;
    inset: 0;
    background-color: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(4px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 50;
    padding: 1rem;
}

.modal-card {
    background-color: var(--bg-card);
    border: 1px solid var(--border-light);
    border-radius: 12px;
    width: 100%;
    max-width: 360px;
    padding: 1.25rem;
    display: flex;
    flex-direction: column;
    gap: 1rem;
    box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.5);
    animation: modalScale 0.2s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

@keyframes modalScale {
    from {
        opacity: 0;
        transform: scale(0.92);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

.modal-header {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.modal-icon {
    font-size: 1.2rem;
}

.modal-header h3 {
    font-size: 1rem;
    font-weight: 600;
}

.modal-body {
    font-size: 0.88rem;
    color: var(--text-secondary);
    line-height: 1.4;
}

.modal-actions {
    display: flex;
    justify-content: flex-end;
    gap: 0.5rem;
    margin-top: 0.25rem;
}

/* Footer / Pie de página */
.app-footer {
    padding: 0.6rem 1rem;
    text-align: center;
    border-top: 1px solid var(--border-color);
    background-color: var(--bg-main);
    font-style: italic;
    font-size: 0.75rem;
    color: var(--text-muted);
}