:root {
    --background-gradient: linear-gradient(180deg, #2a2a2e 0%, #1c1c1f 100%);
    --text-color: #f0f0f0;
    --primary-gradient: linear-gradient(45deg, #007aff, #00c6ff);
    --border-color: rgba(255, 255, 255, 0.1);
    --ai-bubble-bg: #2f2f33;
    --input-bg: rgba(47, 47, 51, 0.7);
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px) scale(0.98); }
    to { opacity: 1; transform: translateY(0) scale(1); }
}

html, body {
    height: 100%;
    margin: 0;
    padding: 0;
    font-family: var(--font-family);
    background: var(--background-gradient);
    color: var(--text-color);
    overflow: hidden;
}

.app-container {
    display: flex;
    flex-direction: column;
    height: 100%;
    width: 100%;
    max-width: 800px; /* Limita a largura em telas grandes */
    margin: 0 auto;
    background-color: transparent;
}

.app-header {
    padding: 15px 20px;
    border-bottom: 1px solid var(--border-color);
    background-color: rgba(30, 30, 33, 0.5);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    z-index: 10;
}

.app-header .logo {
    display: flex;
    align-items: center;
    gap: 12px;
}

.app-header h1 {
    margin: 0;
    font-size: 1.2rem;
    font-weight: 600;
}

.chat-window {
    flex-grow: 1;
    padding: 20px;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: 15px;
}

/* Custom Scrollbar for a modern look */
.chat-window::-webkit-scrollbar { width: 6px; }
.chat-window::-webkit-scrollbar-track { background: transparent; }
.chat-window::-webkit-scrollbar-thumb { background-color: rgba(255, 255, 255, 0.2); border-radius: 3px; }

.message-bubble {
    max-width: 80%;
    padding: 12px 18px;
    border-radius: 20px;
    line-height: 1.6;
    word-wrap: break-word;
    animation: fadeIn 0.4s ease-out;
}

.message-bubble p { margin: 0; }

.message-bubble.user {
    background: var(--primary-gradient);
    color: white;
    align-self: flex-end;
    border-bottom-right-radius: 5px;
}

.message-bubble.ai {
    background-color: var(--ai-bubble-bg);
    color: var(--text-color);
    align-self: flex-start;
    border-bottom-left-radius: 5px;
}

.message-bubble.typing {
    font-style: italic;
    color: #999;
}
.message-bubble.typing p::after {
    content: '...';
    display: inline-block;
    animation: typing-dots 1.5s infinite;
}
@keyframes typing-dots {
    0%, 20% { content: '.'; }
    40%, 60% { content: '..'; }
    80%, 100% { content: '...'; }
}


.chat-input-area {
    padding: 15px 20px 20px 20px;
    border-top: 1px solid var(--border-color);
    background-color: rgba(30, 30, 33, 0.5);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

#chat-form {
    display: flex;
    gap: 10px;
    align-items: center;
}

#message-input {
    flex-grow: 1;
    padding: 14px 20px;
    border: 1px solid var(--border-color);
    border-radius: 24px;
    font-size: 1rem;
    background-color: var(--input-bg);
    color: var(--text-color);
    transition: border-color 0.2s, box-shadow 0.2s;
}

#message-input::placeholder { color: #8e8e93; }

#message-input:focus {
    outline: none;
    border-color: #007aff;
    box-shadow: 0 0 0 3px rgba(0, 122, 255, 0.3);
}

#submit-button {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 48px;
    height: 48px;
    border: none;
    background: var(--primary-gradient);
    color: white;
    border-radius: 50%;
    cursor: pointer;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
    flex-shrink: 0;
}

#submit-button:hover {
    transform: scale(1.05);
    box-shadow: 0 4px 15px rgba(0, 122, 255, 0.3);
}
#submit-button:disabled {
    background: #555;
    cursor: not-allowed;
    transform: scale(1);
    box-shadow: none;
}