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

:root {
    --bg-primary: #000000;
    --bg-secondary: #0a0a0a;
    --bg-tertiary: #111111;
    
    --blue-primary: #0084ff;
    --blue-secondary: #0066cc;
    --blue-glow: rgba(0, 132, 255, 0.15);
    
    --text-primary: #ffffff;
    --text-secondary: #999999;
    --text-dim: #666666;
    
    --border: #1a1a1a;
    --border-light: #222222;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    height: 100vh;
    overflow: hidden;
    display: flex;
}

.sidebar {
    width: 260px;
    background: var(--bg-secondary);
    border-right: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    transition: transform 0.3s ease;
}

.sidebar.hidden {
    display: none; 
}

@media (max-width: 768px) {
    .sidebar {
        position: absolute;
        height: 100%;
        z-index: 100;
        width: 100%; 
    }
    
    .sidebar.hidden {
        display: none;
    }


    .controls {
        gap: 0.3rem;
    }
    
    .selector {
        padding: 0.4rem;
        font-size: 0.75rem;
        max-width: 100px;
    }
    
    .message-content {
        max-width: 90%;
    }
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    margin-bottom: 1rem;
}

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

.logo h1 {
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--text-primary);
}

.new-chat-btn {
    width: 100%;
    padding: 0.7rem;
    background: var(--bg-tertiary);
    color: var(--text-primary);
    border: 1px solid var(--border-light);
    border-radius: 6px;
    font-size: 0.9rem;
    cursor: pointer;
    transition: all 0.2s ease;
}

.new-chat-btn:hover {
    background: var(--bg-primary);
    border-color: var(--blue-primary);
}

.chats-list {
    flex: 1;
    overflow-y: auto;
    padding: 0.5rem;
}

.chat-item {
    padding: 0.8rem;
    margin-bottom: 0.3rem;
    background: var(--bg-tertiary);
    border: 1px solid transparent;
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.2s ease;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    font-size: 0.85rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 0.5rem;
}

.chat-item:hover {
    background: var(--bg-primary);
    border-color: var(--border-light);
}

.chat-item.active {
    background: var(--blue-primary);
    color: var(--text-primary);
}

.chat-item-title {
    flex: 1;
    overflow: hidden;
    text-overflow: ellipsis;
}

.chat-item-delete {
    opacity: 0;
    background: transparent;
    border: none;
    color: var(--text-secondary);
    font-size: 1rem;
    cursor: pointer;
    padding: 0.2rem 0.4rem;
    border-radius: 4px;
    transition: all 0.2s ease;
}

.chat-item:hover .chat-item-delete {
    opacity: 1;
}

.chat-item-delete:hover {
    background: rgba(255, 68, 68, 0.2);
    color: #ff4444;
}

.chat-item.active .chat-item-delete {
    color: white;
}

.chat-item.active .chat-item-delete:hover {
    background: rgba(255, 255, 255, 0.2);
}

.main-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

header {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1rem 1.5rem;
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border);
}

.toggle-sidebar-btn {
    padding: 0.5rem 0.8rem;
    background: transparent;
    color: var(--text-primary);
    border: none;
    font-size: 1.3rem;
    cursor: pointer;
    border-radius: 6px;
    transition: all 0.2s ease;
}

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

.controls {
    display: flex;
    gap: 0.6rem;
    align-items: center;
    margin-left: auto;
}

.selector {
    padding: 0.5rem 0.8rem;
    background: var(--bg-tertiary);
    color: var(--text-primary);
    border: 1px solid var(--border-light);
    border-radius: 6px;
    font-size: 0.85rem;
    cursor: pointer;
    transition: all 0.2s ease;
}

.selector:hover {
    border-color: var(--blue-primary);
}

.selector:focus {
    outline: none;
    border-color: var(--blue-primary);
}

.icon-btn {
    padding: 0.5rem 0.8rem;
    background: var(--bg-tertiary);
    color: var(--text-primary);
    border: 1px solid var(--border-light);
    border-radius: 6px;
    font-size: 1.1rem;
    cursor: pointer;
    transition: all 0.2s ease;
}

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

.chat-container {
    flex: 1;
    overflow-y: auto;
    padding: 2rem 1.5rem;
}

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

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

.chat-container::-webkit-scrollbar-thumb {
    background: var(--border-light);
    border-radius: 3px;
}

.chat-container::-webkit-scrollbar-thumb:hover {
    background: var(--blue-primary);
}

.welcome-message {
    text-align: center;
    margin-top: 15vh;
    animation: fadeIn 0.6s ease;
}

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

.welcome-icon {
    font-size: 4rem;
    margin-bottom: 1rem;
}

.welcome-message h2 {
    font-size: 1.8rem;
    margin-bottom: 0.5rem;
    font-weight: 600;
}

.welcome-message p {
    color: var(--text-secondary);
    font-size: 1rem;
}

.message {
    margin-bottom: 1.5rem;
    animation: slideIn 0.3s ease;
    display: flex;
    flex-direction: column;
}

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

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

.message.user .message-header {
    flex-direction: row-reverse; /* el icono y nombre del lado derecho */
}

.message-icon {
    font-size: 1.1rem;
}

.message-sender {
    font-weight: 500;
    color: var(--text-secondary);
}

.message.user .message-sender {
    color: var(--blue-primary);
}

/* el contenido del mensaje ahora se ajusta al texto */
.message-content {
    padding: 0.9rem 1rem;
    border-radius: 12px;
    line-height: 1.5;
    max-width: 80%;
    width: fit-content; 
    font-size: 0.95rem;
    word-wrap: break-word; 
}

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

.message.user .message-content {
    background: var(--blue-primary);
    color: white;
    border-bottom-right-radius: 2px;
    margin-left: auto; 
    margin-right: 0;
}

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

.message.assistant .message-content {
    background: var(--bg-tertiary);
    border: 1px solid var(--border-light);
    color: var(--text-primary);
    border-bottom-left-radius: 2px;
    margin-right: auto;
    margin-left: 0;
}

.message-meta {
    margin-top: 0.3rem;
    font-size: 0.75rem;
    color: var(--text-dim);
}

.message.user .message-meta {
    margin-right: 0.5rem;
}

.message.assistant .message-meta {
    margin-left: 0.5rem;
}

.loading {
    display: inline-flex;
    gap: 0.3rem;
    padding: 0.9rem 1rem;
}

.loading-dot {
    width: 6px;
    height: 6px;
    background: var(--blue-primary);
    border-radius: 50%;
    animation: bounce 1.2s ease-in-out infinite;
}

.loading-dot:nth-child(2) {
    animation-delay: 0.15s;
}

.loading-dot:nth-child(3) {
    animation-delay: 0.3s;
}

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

/* === INPUT === */
.input-area {
    padding: 1.2rem 1.5rem;
    background: var(--bg-secondary);
    border-top: 1px solid var(--border);
}

.input-wrapper {
    display: flex;
    gap: 0.7rem;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-light);
    border-radius: 10px;
    padding: 0.7rem;
    transition: all 0.2s ease;
}

.input-wrapper:focus-within {
    border-color: var(--blue-primary);
}

#message-input {
    flex: 1;
    background: transparent;
    border: none;
    color: var(--text-primary);
    font-size: 0.95rem;
    font-family: inherit;
    resize: none;
    max-height: 120px;
    outline: none;
}

#message-input::placeholder {
    color: var(--text-dim);
}

.send-btn {
    background: var(--blue-primary);
    border: none;
    color: white;
    width: 40px;
    height: 40px;
    border-radius: 6px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s ease;
    align-self: flex-end;
}

.send-btn:hover {
    background: var(--blue-secondary);
}

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

.send-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.send-icon {
    font-size: 1.1rem;
}

.rate-limit-info {
    margin-top: 0.7rem;
    text-align: center;
    color: var(--text-secondary);
    font-size: 0.8rem;
    min-height: 18px;
}

.rate-limit-warning {
    color: #ff4444;
}

@media (max-width: 768px) {
    .sidebar {
        position: absolute;
        height: 100%;
        z-index: 100;
    }
    
    .sidebar.hidden {
        transform: translateX(-100%);
    }
    
    .message-content {
        max-width: 90%;
    }
}