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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, #0f172a 0%, #1e293b 100%);
    color: #e2e8f0;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.container {
    max-width: 800px;
    margin: 0 auto;
    padding: 20px;
    flex: 1;
}

header {
    text-align: center;
    margin-bottom: 30px;
}

header h1 {
    font-size: 2.5em;
    color: #60a5fa;
    margin-bottom: 10px;
    text-shadow: 0 0 20px rgba(96, 165, 250, 0.3);
}

.subtitle {
    color: #94a3b8;
    font-size: 1.1em;
    margin-bottom: 20px;
}

.model-selector {
    margin-top: 20px;
}

.model-selector select {
    background: rgba(30, 41, 59, 0.8);
    border: 1px solid #475569;
    color: #e2e8f0;
    padding: 8px 16px;
    border-radius: 8px;
    font-size: 0.9em;
    cursor: pointer;
    transition: all 0.3s ease;
}

.model-selector select:hover {
    border-color: #60a5fa;
    box-shadow: 0 0 0 2px rgba(96, 165, 250, 0.1);
}

.chat-container {
    background: rgba(30, 41, 59, 0.6);
    border-radius: 16px;
    padding: 20px;
    backdrop-filter: blur(10px);
    border: 1px solid rgba(96, 165, 250, 0.2);
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
}

.messages {
    height: 400px;
    overflow-y: auto;
    margin-bottom: 20px;
    padding: 10px;
    border-radius: 12px;
    background: rgba(15, 23, 42, 0.4);
    border: 1px solid rgba(96, 165, 250, 0.1);
}

.message {
    margin-bottom: 15px;
    padding: 12px 16px;
    border-radius: 12px;
    max-width: 80%;
    word-wrap: break-word;
    animation: fadeIn 0.3s ease-in;
}

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

.user-message {
    background: linear-gradient(135deg, #3b82f6 0%, #1d4ed8 100%);
    color: white;
    margin-left: auto;
    box-shadow: 0 4px 12px rgba(59, 130, 246, 0.3);
}

.assistant-message {
    background: rgba(51, 65, 85, 0.8);
    color: #e2e8f0;
    border: 1px solid rgba(96, 165, 250, 0.2);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
}

.assistant-message h3, .assistant-message h4 {
    color: #60a5fa;
    margin: 12px 0 8px 0;
}

.assistant-message ul {
    margin-left: 20px;
    margin-top: 8px;
}

.assistant-message li {
    margin-bottom: 4px;
}

.assistant-message strong {
    color: #fbbf24;
}

.chips-container {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-bottom: 15px;
}

.chip {
    background: rgba(96, 165, 250, 0.1);
    border: 1px solid rgba(96, 165, 250, 0.3);
    color: #60a5fa;
    padding: 8px 12px;
    border-radius: 20px;
    font-size: 0.85em;
    cursor: pointer;
    transition: all 0.3s ease;
    white-space: nowrap;
}

.chip:hover {
    background: rgba(96, 165, 250, 0.2);
    border-color: #60a5fa;
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(96, 165, 250, 0.2);
}

.input-wrapper {
    display: flex;
    gap: 10px;
}

.input-wrapper input {
    flex: 1;
    padding: 12px 16px;
    background: rgba(15, 23, 42, 0.6);
    border: 1px solid rgba(96, 165, 250, 0.3);
    border-radius: 12px;
    color: #e2e8f0;
    font-size: 1em;
    transition: all 0.3s ease;
}

.input-wrapper input:focus {
    outline: none;
    border-color: #60a5fa;
    box-shadow: 0 0 0 3px rgba(96, 165, 250, 0.1);
    background: rgba(15, 23, 42, 0.8);
}

.input-wrapper input::placeholder {
    color: #64748b;
}

.input-wrapper button {
    padding: 12px 24px;
    background: linear-gradient(135deg, #3b82f6 0%, #1d4ed8 100%);
    color: white;
    border: none;
    border-radius: 12px;
    cursor: pointer;
    font-weight: 600;
    transition: all 0.3s ease;
}

.input-wrapper button:hover:not(:disabled) {
    transform: translateY(-1px);
    box-shadow: 0 6px 20px rgba(59, 130, 246, 0.4);
}

.input-wrapper button:disabled {
    background: rgba(100, 116, 139, 0.5);
    cursor: not-allowed;
}

.loading {
    display: inline-block;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

.footer {
    background: rgba(15, 23, 42, 0.8);
    padding: 20px;
    text-align: center;
    border-top: 1px solid rgba(96, 165, 250, 0.2);
    margin-top: 30px;
}

.footer p {
    color: #94a3b8;
    font-size: 0.9em;
    margin-bottom: 8px;
}

.footer strong {
    color: #60a5fa;
}

.tech-stack {
    font-size: 0.8em !important;
    color: #64748b !important;
}

/* Scrollbar personalizado */
.messages::-webkit-scrollbar {
    width: 6px;
}

.messages::-webkit-scrollbar-track {
    background: rgba(15, 23, 42, 0.4);
    border-radius: 3px;
}

.messages::-webkit-scrollbar-thumb {
    background: rgba(96, 165, 250, 0.4);
    border-radius: 3px;
}

.messages::-webkit-scrollbar-thumb:hover {
    background: rgba(96, 165, 250, 0.6);
}

/* Responsive */
@media (max-width: 600px) {
    .container {
        padding: 15px;
    }
    
    header h1 {
        font-size: 2em;
    }
    
    .chips-container {
        justify-content: center;
    }
    
    .chip {
        font-size: 0.8em;
        padding: 6px 10px;
    }
    
    .messages {
        height: 350px;
    }
    
    .message {
        max-width: 90%;
    }
}