/* =============================================
   CHAT IA - ESTILOS MODERNOS Y PROFESIONALES
   ============================================= */

/* Variables CSS */
:root {
    /* Colores principales */
    --primary-color: #4F46E5;
    --primary-hover: #4338CA;
    --primary-light: #EEF2FF;
    
    /* Colores secundarios */
    --secondary-color: #10B981;
    --secondary-hover: #059669;
    
    /* Colores de fondo */
    --bg-primary: #0F172A;
    --bg-secondary: #1E293B;
    --bg-tertiary: #334155;
    --bg-message-user: #4F46E5;
    --bg-message-bot: #374151;
    
    /* Colores de texto */
    --text-primary: #F8FAFC;
    --text-secondary: #94A3B8;
    --text-muted: #64748B;
    
    /* Colores de bordes */
    --border-color: #334155;
    --border-focus: #4F46E5;
    
    /* Sombras */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.4);
    --shadow-glow: 0 0 20px rgba(79, 70, 229, 0.3);
    
    /* Bordes */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --radius-full: 9999px;
    
    /* Transiciones */
    --transition-fast: 150ms ease;
    --transition-normal: 250ms ease;
    --transition-slow: 350ms ease;
    
    /* Tamaños */
    --header-height: 70px;
    --input-height: 120px;
}

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

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    line-height: 1.6;
    overflow: hidden;
}

/* Fondo con patrón */
body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: 
        radial-gradient(circle at 20% 80%, rgba(79, 70, 229, 0.15) 0%, transparent 50%),
        radial-gradient(circle at 80% 20%, rgba(16, 185, 129, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 50% 50%, rgba(79, 70, 229, 0.05) 0%, transparent 70%);
    pointer-events: none;
    z-index: 0;
}

/* Contenedor principal */
.chat-container {
    width: 100%;
    max-width: 900px;
    height: 100vh;
    max-height: 800px;
    background: var(--bg-secondary);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-lg), var(--shadow-glow);
    display: flex;
    flex-direction: column;
    overflow: hidden;
    position: relative;
    z-index: 1;
    margin: 20px;
    border: 1px solid var(--border-color);
}

@media (max-width: 768px) {
    .chat-container {
        max-width: 100%;
        height: 100vh;
        max-height: 100vh;
        margin: 0;
        border-radius: 0;
    }
}

/* =============================================
   HEADER
   ============================================= */
.chat-header {
    height: var(--header-height);
    background: linear-gradient(135deg, var(--bg-secondary) 0%, var(--bg-tertiary) 100%);
    border-bottom: 1px solid var(--border-color);
    padding: 0 24px;
    display: flex;
    align-items: center;
    flex-shrink: 0;
}

.header-content {
    width: 100%;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    display: flex;
    align-items: center;
    gap: 14px;
}

.logo-icon {
    width: 48px;
    height: 48px;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-hover) 100%);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 22px;
    color: white;
    box-shadow: var(--shadow-md);
}

.logo-text h1 {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 2px;
}

.status {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 0.8rem;
    color: var(--secondary-color);
}

.status-dot {
    width: 8px;
    height: 8px;
    background: var(--secondary-color);
    border-radius: var(--radius-full);
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; transform: scale(1); }
    50% { opacity: 0.6; transform: scale(1.1); }
}

.header-actions {
    display: flex;
    gap: 8px;
}

.icon-btn {
    width: 40px;
    height: 40px;
    border: none;
    background: transparent;
    color: var(--text-secondary);
    border-radius: var(--radius-md);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.1rem;
    transition: var(--transition-normal);
}

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

/* =============================================
   ÁREA DE MENSAJES
   ============================================= */
.messages-container {
    flex: 1;
    overflow-y: auto;
    padding: 24px;
    display: flex;
    flex-direction: column;
    gap: 20px;
    scroll-behavior: smooth;
}

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

.messages-container::-webkit-scrollbar-track {
    background: transparent;
}

.messages-container::-webkit-scrollbar-thumb {
    background: var(--bg-tertiary);
    border-radius: var(--radius-full);
}

.messages-container::-webkit-scrollbar-thumb:hover {
    background: var(--text-muted);
}

/* Mensaje de bienvenida */
.welcome-message {
    text-align: center;
    padding: 60px 20px;
    animation: fadeIn 0.5s ease;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

.welcome-icon {
    width: 80px;
    height: 80px;
    background: linear-gradient(135deg, var(--primary-light) 0%, rgba(79, 70, 229, 0.2) 100%);
    border-radius: var(--radius-xl);
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 24px;
    font-size: 36px;
    color: var(--primary-color);
}

.welcome-message h2 {
    font-size: 1.75rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 12px;
}

.welcome-message p {
    font-size: 1rem;
    color: var(--text-secondary);
    max-width: 400px;
    margin: 0 auto;
}

/* Estilos de mensajes */
.message {
    display: flex;
    gap: 12px;
    max-width: 85%;
    animation: messageSlide 0.3s ease;
}

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

.message.user {
    flex-direction: row-reverse;
    align-self: flex-end;
    margin-left: auto;
}

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

.message-avatar {
    width: 36px;
    height: 36px;
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    font-size: 16px;
}

.message.user .message-avatar {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-hover) 100%);
    color: white;
}

.message.bot .message-avatar {
    background: linear-gradient(135deg, var(--bg-tertiary) 0%, var(--bg-secondary) 100%);
    color: var(--secondary-color);
    border: 1px solid var(--border-color);
}

.message-content {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.message.user .message-content {
    align-items: flex-end;
}

.message-bubble {
    padding: 14px 18px;
    border-radius: var(--radius-lg);
    font-size: 0.95rem;
    line-height: 1.5;
    word-wrap: break-word;
    white-space: pre-wrap;
}

.message.user .message-bubble {
    background: linear-gradient(135deg, var(--bg-message-user) 0%, var(--primary-hover) 100%);
    color: white;
    border-bottom-right-radius: 4px;
}

.message.bot .message-bubble {
    background: var(--bg-message-bot);
    color: var(--text-primary);
    border-bottom-left-radius: 4px;
    border: 1px solid var(--border-color);
}

.message-time {
    font-size: 0.7rem;
    color: var(--text-muted);
    padding: 0 4px;
}

/* Indicador de escritura */
.typing-indicator {
    padding: 10px 0;
}

.typing-content {
    display: flex;
    align-items: center;
    gap: 12px;
}

.typing-avatar {
    width: 36px;
    height: 36px;
    background: var(--bg-tertiary);
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--secondary-color);
    border: 1px solid var(--border-color);
}

.typing-bubble {
    background: var(--bg-message-bot);
    border: 1px solid var(--border-color);
    padding: 12px 20px;
    border-radius: var(--radius-lg);
    display: flex;
    gap: 4px;
    align-items: center;
}

.typing-bubble .dot {
    width: 8px;
    height: 8px;
    background: var(--text-muted);
    border-radius: var(--radius-full);
    animation: typingBounce 1.4s infinite ease-in-out;
}

.typing-bubble .dot:nth-child(1) { animation-delay: 0s; }
.typing-bubble .dot:nth-child(2) { animation-delay: 0.2s; }
.typing-bubble .dot:nth-child(3) { animation-delay: 0.4s; }

@keyframes typingBounce {
    0%, 60%, 100% { transform: translateY(0); }
    30% { transform: translateY(-8px); }
}

/* =============================================
   ÁREA DE INPUT
   ============================================= */
.input-area {
    padding: 20px 24px;
    background: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
    flex-shrink: 0;
}

.input-container {
    display: flex;
    align-items: flex-end;
    gap: 12px;
    background: var(--bg-primary);
    border-radius: var(--radius-lg);
    padding: 8px;
    border: 2px solid var(--border-color);
    transition: var(--transition-normal);
}

.input-container:focus-within {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.15);
}

.input-action-btn {
    width: 42px;
    height: 42px;
    border: none;
    background: var(--bg-tertiary);
    color: var(--text-secondary);
    border-radius: var(--radius-md);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1rem;
    transition: var(--transition-normal);
    flex-shrink: 0;
}

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

.input-wrapper {
    flex: 1;
    min-width: 0;
}

#messageInput {
    width: 100%;
    background: transparent;
    border: none;
    color: var(--text-primary);
    font-family: inherit;
    font-size: 0.95rem;
    padding: 10px 4px;
    resize: none;
    outline: none;
    max-height: 100px;
    line-height: 1.5;
}

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

.send-btn {
    width: 42px;
    height: 42px;
    border: none;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-hover) 100%);
    color: white;
    border-radius: var(--radius-md);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1rem;
    transition: var(--transition-normal);
    flex-shrink: 0;
}

.send-btn:hover {
    transform: scale(1.05);
    box-shadow: var(--shadow-md);
}

.send-btn:active {
    transform: scale(0.95);
}

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

.input-hint {
    font-size: 0.75rem;
    color: var(--text-muted);
    margin-top: 10px;
    text-align: center;
}

/* =============================================
   TOAST NOTIFICATION
   ============================================= */
.toast {
    position: fixed;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%) translateY(100px);
    background: var(--bg-tertiary);
    color: var(--text-primary);
    padding: 14px 24px;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 0.9rem;
    z-index: 1000;
    opacity: 0;
    transition: var(--transition-normal);
    border: 1px solid var(--border-color);
}

.toast.show {
    opacity: 1;
    transform: translateX(-50%) translateY(0);
}

.toast.success {
    border-color: var(--secondary-color);
}

.toast.error {
    border-color: #EF4444;
}

.toast i {
    font-size: 1.1rem;
}

.toast.success i { color: var(--secondary-color); }
.toast.error i { color: #EF4444; }

/* =============================================
   RESPONSIVE
   ============================================= */
@media (max-width: 600px) {
    .chat-container {
        margin: 0;
        border-radius: 0;
    }
    
    .chat-header {
        padding: 0 16px;
    }
    
    .logo-icon {
        width: 40px;
        height: 40px;
        font-size: 18px;
    }
    
    .logo-text h1 {
        font-size: 1.1rem;
    }
    
    .messages-container {
        padding: 16px;
    }
    
    .message {
        max-width: 95%;
    }
    
    .message-bubble {
        padding: 12px 14px;
    }
    
    .input-area {
        padding: 16px;
    }
}

/* Animación de entrada */
.chat-container {
    animation: containerEnter 0.5s ease;
}

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