/* 
Base Structure CSS - Sin colores específicos
Este archivo contiene toda la estructura, layout y animaciones
Los colores se definen en archivos separados de temas
*/

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

body {
    font-family: var(--font-family);
    background-color: var(--bg-primary);
    color: var(--text-primary);
    transition: background-color var(--transition-medium);
    overflow: hidden;
}

/* === SCROLLBAR PERSONALIZADA === */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

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

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

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

/* Scrollbar para Firefox */
* {
    scrollbar-width: thin;
    scrollbar-color: var(--scrollbar-thumb) var(--scrollbar-track);
}

/* === ESTILOS DE FOCUS Y SELECCIÓN === */
*:focus {
    outline: 2px solid var(--accent-primary);
    outline-offset: 2px;
}

::selection {
    background-color: var(--accent-primary);
    color: var(--text-primary);
}

/* === ELEMENTOS BASE === */
input, textarea, select {
    background-color: var(--input-bg);
    border: 1px solid var(--input-border);
    color: var(--text-primary);
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
    padding: var(--spacing-sm) var(--spacing-md);
    font-family: var(--font-family);
    font-size: var(--font-base);
}

input:focus, textarea:focus, select:focus {
    border-color: var(--input-focus);
    box-shadow: 0 0 0 3px var(--focus-shadow);
}

input::placeholder, textarea::placeholder {
    color: var(--text-placeholder);
}

button {
    background-color: var(--btn-secondary-bg);
    border: 1px solid var(--border-primary);
    color: var(--btn-secondary-text);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-fast);
    font-family: var(--font-family);
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: var(--font-base);
}

button:hover {
    background-color: var(--btn-secondary-hover);
    transform: translateY(-1px);
}

button:active {
    transform: translateY(0);
}

button:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none;
}

.btn-primary, button.btn-primary {
    background-color: var(--btn-primary-bg);
    color: var(--btn-primary-text);
    border-color: var(--btn-primary-bg);
    font-weight: 600;
}

.btn-primary:hover, button.btn-primary:hover {
    background-color: var(--btn-primary-hover);
    border-color: var(--btn-primary-hover);
}

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

a:hover {
    color: var(--accent-secondary);
    text-decoration: underline;
}

/* === CONTENEDOR PRINCIPAL === */
.chat-container {
    display: flex;
    height: 100vh;
    width: 100vw;
    position: relative;
}

/* === SIDEBAR === */
.sidebar {
    width: 300px;
    min-width: 250px;
    max-width: 400px;
    background-color: var(--sidebar-bg);
    border-right: 1px solid var(--sidebar-border);
    display: flex;
    flex-direction: column;
    transition: transform var(--transition-medium), width var(--transition-medium);
    z-index: var(--z-sidebar);
    position: relative;
}

.sidebar-header {
    padding: var(--spacing-lg);
    border-bottom: 1px solid var(--sidebar-border);
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--spacing-md);
}

.new-conversation-btn {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md);
    background: var(--btn-primary-bg);
    color: var(--btn-primary-text);
    border: none;
    border-radius: var(--radius-md);
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.new-conversation-btn:hover {
    background: var(--btn-primary-hover);
    transform: translateY(-1px);
    box-shadow: 0 4px 12px var(--primary-shadow);
}

.new-conversation-btn .icon {
    font-size: var(--font-lg);
    font-weight: bold;
}

.sidebar-toggle {
    display: none;
    width: 40px;
    height: 40px;
    background: var(--btn-secondary-bg);
    border: 1px solid var(--border-primary);
    border-radius: var(--radius-md);
    cursor: pointer;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-fast);
}

.sidebar-toggle:hover {
    background: var(--btn-secondary-hover);
}

.hamburger-icon {
    font-size: var(--font-lg);
    color: var(--text-primary);
}

/* === LISTA DE CONVERSACIONES === */
.conversations-list {
    flex: 1;
    overflow-y: auto;
    padding: var(--spacing-md);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.conversation-item {
    display: flex;
    align-items: center;
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-fast);
    border: 1px solid transparent;
    position: relative;
}

.conversation-item:hover {
    background-color: var(--sidebar-item-hover);
    transform: translateX(2px);
}

.conversation-item.active {
    background-color: var(--sidebar-item-active);
    border-color: var(--accent-primary);
}

.conversation-content {
    flex: 1;
    min-width: 0;
}

.conversation-title {
    font-size: var(--font-sm);
    font-weight: 500;
    color: var(--text-primary);
    margin-bottom: var(--spacing-xs);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.conversation-date {
    font-size: var(--font-xs);
    color: var(--text-muted);
}

.delete-btn {
    opacity: 0;
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--error);
    color: white;
    border: none;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all var(--transition-fast);
    font-size: var(--font-sm);
}

.conversation-item:hover .delete-btn {
    opacity: 1;
}

.delete-btn:hover {
    transform: scale(1.1);
    box-shadow: 0 2px 8px var(--error-shadow);
}

/* === PIE DE SIDEBAR === */
.sidebar-footer {
    padding: var(--spacing-lg);
    border-top: 1px solid var(--sidebar-border);
}

.user-profile {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-md);
    background: var(--bg-tertiary);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.user-profile:hover {
    background: var(--bg-accent);
    transform: translateY(-1px);
}

.user-avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: var(--avatar-bg);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--avatar-text);
    font-weight: bold;
    font-size: var(--font-lg);
}

.user-info {
    flex: 1;
    min-width: 0;
}

.username {
    display: block;
    font-weight: 600;
    color: var(--text-primary);
    font-size: var(--font-sm);
    margin-bottom: var(--spacing-xs);
}

.settings-btn {
    background: none;
    border: none;
    color: var(--text-muted);
    font-size: var(--font-xs);
    cursor: pointer;
    transition: color var(--transition-fast);
    padding: 0;
}

.settings-btn:hover {
    color: var(--accent-primary);
}

/* === CONTENEDOR PRINCIPAL === */
.main-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    background-color: var(--bg-primary);
    position: relative;
}

.chat-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-lg);
    background-color: var(--bg-secondary);
    border-bottom: 1px solid var(--border-primary);
    min-height: 70px;
    flex-shrink: 0;
}

/* === CONTENEDOR DE MENSAJES === */
.messages-container {
    flex: 1;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    position: relative;
    min-height: 0;
}

/* === CONTENEDOR DE INPUT === */
.input-container {
    background-color: var(--bg-secondary);
    border-top: 1px solid var(--border-primary);
    padding: var(--spacing-lg);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
    flex-shrink: 0;
}

.input-wrapper {
    display: flex;
    align-items: flex-end;
    gap: var(--spacing-md);
    background-color: var(--input-bg);
    border: 2px solid var(--input-border);
    border-radius: var(--radius-lg);
    padding: var(--spacing-md);
    transition: all var(--transition-fast);
}

.input-wrapper:focus-within {
    border-color: var(--input-focus);
    box-shadow: 0 0 0 3px var(--focus-shadow);
}

#messageInput {
    flex: 1;
    border: none;
    background: transparent;
    color: var(--text-primary);
    font-family: var(--font-family);
    font-size: var(--font-base);
    resize: none;
    outline: none;
    line-height: 1.5;
    min-height: 24px;
    overflow-y: auto;
}

#messageInput::placeholder {
    color: var(--text-placeholder);
}

.send-btn {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--btn-primary-bg);
    color: var(--btn-primary-text);
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-fast);
    flex-shrink: 0;
    align-self: flex-end;
}

.send-btn:hover:not(:disabled) {
    background: var(--btn-primary-hover);
    transform: scale(1.05);
}

.send-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none;
}

.send-icon {
    font-size: var(--font-lg);
    font-weight: bold;
}

.current-chat-title {
    font-size: var(--font-lg);
    font-weight: 600;
    color: var(--text-primary);
    margin: 0;
}

.chat-controls {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.resize-btn {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--btn-secondary-bg);
    border: 1px solid var(--border-primary);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.resize-btn:hover {
    background: var(--btn-secondary-hover);
    transform: scale(1.05);
}

.resize-icon {
    font-size: var(--font-lg);
    color: var(--text-primary);
}

.messages-list {
    flex: 1;
    overflow-y: auto;
    padding: var(--spacing-lg);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
    scroll-behavior: smooth;
}

.messages-list::-webkit-scrollbar {
    width: 6px;
}

.conversations-list::-webkit-scrollbar {
    width: 4px;
}

.welcome-message {
    text-align: center;
    padding: var(--spacing-2xl);
    color: var(--text-secondary);
    max-width: 600px;
    margin: auto;
}

.welcome-message h3 {
    font-size: var(--font-xl);
    margin-bottom: var(--spacing-md);
    color: var(--text-primary);
}

.welcome-message p {
    font-size: var(--font-base);
    line-height: 1.6;
}

/* === MENSAJES === */
.message-bubble {
    display: flex;
    margin-bottom: var(--spacing-md);
    animation: fadeInUp 0.3s ease;
}

.message-bubble.user {
    justify-content: flex-end;
}

.message-bubble.assistant {
    justify-content: flex-start;
}

.message-content {
    max-width: 70%;
    padding: var(--spacing-md) var(--spacing-lg);
    border-radius: var(--radius-lg);
    position: relative;
    word-wrap: break-word;
    line-height: 1.5;
}

.message-bubble.user .message-content {
    background-color: var(--message-user-bg);
    color: var(--message-user-text);
    border-bottom-right-radius: var(--radius-sm);
}

.message-bubble.assistant .message-content {
    background-color: var(--message-assistant-bg);
    color: var(--message-assistant-text);
    border: 1px solid var(--border-primary);
    border-bottom-left-radius: var(--radius-sm);
}

.message-timestamp {
    font-size: var(--font-xs);
    color: var(--text-muted);
    margin-top: var(--spacing-xs);
    text-align: right;
}

.message-bubble.assistant .message-timestamp {
    text-align: left;
}

/* === INDICADOR DE ESCRITURA === */
.loading-message {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md);
    background: var(--bg-tertiary);
    border-radius: var(--radius-lg);
    margin: var(--spacing-md) 0;
}

.typing-indicator .loading-dots {
    display: flex;
    gap: 4px;
}

.loading-dots span {
    width: 6px;
    height: 6px;
    background: var(--text-muted);
    border-radius: 50%;
    animation: bounce 1.4s ease-in-out infinite both;
}

.loading-dots span:nth-child(1) { animation-delay: -0.32s; }
.loading-dots span:nth-child(2) { animation-delay: -0.16s; }

#messageInput::placeholder {
    color: var(--text-placeholder);
}

.send-btn {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--btn-primary-bg);
    color: var(--btn-primary-text);
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-fast);
    flex-shrink: 0;
}

.send-btn:hover:not(:disabled) {
    background: var(--btn-primary-hover);
    transform: scale(1.05);
}

.send-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none;
}

.send-icon {
    font-size: var(--font-lg);
    font-weight: bold;
}

.input-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: var(--spacing-sm);
    font-size: var(--font-xs);
    color: var(--text-muted);
}

.char-counter.warning {
    color: var(--warning);
}

.char-counter.error {
    color: var(--error);
}

/* === OVERLAY PARA MÓVIL === */
.sidebar-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    z-index: var(--z-overlay);
}

/* === MODALES === */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(5px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: var(--z-modal);
    animation: fadeIn var(--transition-medium) ease;
}

.modal-content {
    background: var(--bg-secondary);
    border: 1px solid var(--border-primary);
    border-radius: var(--radius-xl);
    width: 90%;
    max-width: 500px;
    max-height: 80vh;
    overflow-y: auto;
    box-shadow: 0 20px 60px var(--shadow-heavy);
    animation: slideIn var(--transition-medium) ease;
}

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

.modal-header h3 {
    font-size: var(--font-xl);
    color: var(--text-primary);
    margin: 0;
}

.modal-close {
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--btn-secondary-bg);
    border: 1px solid var(--border-primary);
    border-radius: 50%;
    cursor: pointer;
    font-size: var(--font-lg);
    color: var(--text-primary);
    transition: all var(--transition-fast);
}

.modal-close:hover {
    background: var(--error);
    color: white;
    transform: scale(1.1);
}

.modal-body {
    padding: var(--spacing-xl);
}

.settings-section {
    margin-bottom: var(--spacing-xl);
}

.settings-section h4 {
    font-size: var(--font-lg);
    color: var(--text-primary);
    margin-bottom: var(--spacing-md);
    border-bottom: 1px solid var(--border-primary);
    padding-bottom: var(--spacing-sm);
}

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

.theme-selector label {
    font-weight: 500;
    color: var(--text-primary);
    min-width: 60px;
}

.theme-selector select {
    flex: 1;
    padding: var(--spacing-sm) var(--spacing-md);
    background-color: var(--input-bg);
    border: 1px solid var(--input-border);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    cursor: pointer;
}

.logout-btn {
    background: var(--error);
    color: white;
    border: none;
    padding: var(--spacing-sm) var(--spacing-lg);
    border-radius: var(--radius-md);
    cursor: pointer;
    font-weight: 600;
    transition: all var(--transition-fast);
}

.logout-btn:hover {
    background: var(--error-hover);
    transform: translateY(-1px);
}

/* === MENSAJES DE ESTADO === */
.error-message {
    background-color: var(--error-bg);
    border: 1px solid var(--error);
    color: var(--error);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
}

.success-message {
    background-color: var(--success-bg);
    border: 1px solid var(--success);
    color: var(--success);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
}

.warning-message {
    background-color: var(--warning-bg);
    border: 1px solid var(--warning);
    color: var(--warning);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
}

/* === CLASES UTILITARIAS === */
.text-muted {
    color: var(--text-muted);
}

.text-secondary {
    color: var(--text-secondary);
}

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

.bg-tertiary {
    background-color: var(--bg-tertiary);
}

/* === LAYOUTS RESPONSIVOS === */
.mobile-only {
    display: none;
}

.desktop-hidden {
    display: none;
}

/* === LAYOUTS DE REDIMENSIONAMIENTO === */
/* El textarea define su altura, messages-container se adapta */

/* Layout por defecto: textarea normal */
.chat-container.layout-75-25 #messageInput {
    min-height: 24px;
    max-height: 120px;
}

/* Layout para escribir mucho: textarea grande */
.chat-container.layout-20-80 #messageInput {
    min-height: 200px;
    max-height: 60vh;
}

/* Layout para escribir poco: textarea pequeño */
.chat-container.layout-80-20 #messageInput {
    min-height: 40px;
    max-height: 80px;
}

/* === ANIMACIONES === */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

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

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateY(-20px) scale(0.95);
    }
    to {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

@keyframes bounce {
    0%, 80%, 100% {
        transform: scale(0);
    } 40% {
        transform: scale(1);
    }
}

.fade-in {
    animation: fadeIn var(--transition-medium) ease;
}

.slide-in-left {
    animation: slideInLeft var(--transition-medium) ease;
}

@keyframes slideInLeft {
    from {
        opacity: 0;
        transform: translateX(-20px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

/* === MEDIA QUERIES RESPONSIVOS === */
@media (max-width: 768px) {
    .mobile-only {
        display: flex;
    }
    
    .desktop-hidden {
        display: flex;
    }
    
    .sidebar {
        position: fixed;
        top: 0;
        left: 0;
        height: 100%;
        width: 280px;
        transform: translateX(-100%);
        z-index: var(--z-sidebar);
    }
    
    .sidebar.open {
        transform: translateX(0);
    }
    
    .sidebar-overlay.active {
        display: block;
    }
    
    .main-content {
        width: 100%;
    }
    
    .chat-header {
        padding: var(--spacing-md);
    }
    
    .messages-list {
        padding: var(--spacing-md);
    }
    
    .input-container {
        padding: var(--spacing-md);
    }
    
    .message-content {
        max-width: 85%;
    }
    
    .modal-content {
        width: 95%;
        margin: var(--spacing-md);
    }
    
    .modal-header,
    .modal-body {
        padding: var(--spacing-lg);
    }
}

@media (max-width: 480px) {
    .sidebar {
        width: 100%;
    }
    
    .chat-header {
        min-height: 60px;
        padding: var(--spacing-sm) var(--spacing-md);
    }
    
    .current-chat-title {
        font-size: var(--font-base);
    }
    
    .messages-list {
        padding: var(--spacing-sm);
        gap: var(--spacing-md);
    }
    
    .message-content {
        max-width: 90%;
        padding: var(--spacing-sm) var(--spacing-md);
    }
    
    .input-container {
        padding: var(--spacing-sm);
        min-height: 80px;
    }
    
    .input-wrapper {
        padding: var(--spacing-sm);
        min-height: 40px;
    }
    
    .send-btn {
        width: 36px;
        height: 36px;
        flex-shrink: 0;
    }
    
    .welcome-message {
        padding: var(--spacing-lg);
    }
    
    .welcome-message h3 {
        font-size: var(--font-lg);
    }
    
    /* En móvil, mantener comportamiento normal para el textarea */
    #messageInput {
        height: auto;
        min-height: 24px;
        max-height: 80px;
    }
    
    /* Forzar layouts más conservadores en móvil */
    .chat-container.layout-20-80 .messages-container {
        flex: 0 0 40%;
    }
    
    .chat-container.layout-20-80 .input-container {
        flex: 0 0 60%;
    }
    
    .chat-container.layout-80-20 .messages-container {
        flex: 0 0 70%;
    }
    
    .chat-container.layout-80-20 .input-container {
        flex: 0 0 30%;
    }
}

/* === ACCESIBILIDAD === */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

@media (prefers-contrast: high) {
    .sidebar {
        border-right-width: 2px;
    }
    
    .message-content {
        border-width: 2px;
    }
    
    .input-wrapper {
        border-width: 2px;
    }
}

.conversation-item:focus,
.delete-btn:focus,
.send-btn:focus,
.resize-btn:focus {
    outline: 2px solid var(--accent-primary);
    outline-offset: 2px;
}