/* === Variables y temas === */
:root {
    --accent: #6366f1;
    --accent-hover: #4f46e5;
    --radius: 12px;
    --radius-sm: 8px;
    --transition: 0.2s ease;
}

[data-theme="dark"] {
    --bg: #0f0f11;
    --bg-secondary: #1a1a1f;
    --bg-tertiary: #25252b;
    --text: #e4e4e7;
    --text-secondary: #a1a1aa;
    --text-muted: #71717a;
    --border: #2e2e35;
    --msg-user: #6366f1;
    --msg-user-text: #ffffff;
    --msg-ai: #1e1e24;
    --msg-ai-text: #e4e4e7;
    --input-bg: #1a1a1f;
    --shadow: 0 2px 12px rgba(0,0,0,0.4);
}

[data-theme="light"] {
    --bg: #f8f9fa;
    --bg-secondary: #ffffff;
    --bg-tertiary: #f0f0f2;
    --text: #18181b;
    --text-secondary: #52525b;
    --text-muted: #a1a1aa;
    --border: #e4e4e7;
    --msg-user: #6366f1;
    --msg-user-text: #ffffff;
    --msg-ai: #ffffff;
    --msg-ai-text: #18181b;
    --input-bg: #ffffff;
    --shadow: 0 2px 12px rgba(0,0,0,0.08);
}

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

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

/* === Layout === */
.app {
    display: flex;
    flex-direction: column;
    height: 100vh;
    max-width: 900px;
    margin: 0 auto;
}

/* === Header === */
.header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 12px 20px;
    border-bottom: 1px solid var(--border);
    background: var(--bg-secondary);
    flex-shrink: 0;
}

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

.header-left h1 {
    font-size: 18px;
    font-weight: 600;
}

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

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

.status-badge {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 4px 10px;
    border-radius: 20px;
    font-size: 12px;
    background: var(--bg-tertiary);
    color: var(--text-secondary);
}

.status-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: #71717a;
    transition: background var(--transition);
}

.status-badge.online .status-dot { background: #22c55e; }
.status-badge.offline .status-dot { background: #ef4444; }
.status-badge.loading .status-dot {
    background: #eab308;
    animation: pulse 1.5s infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.4; }
}

.btn-icon {
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    background: transparent;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all var(--transition);
}

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

/* === Chat container === */
.chat-container {
    flex: 1;
    overflow-y: auto;
    padding: 20px;
    scroll-behavior: smooth;
}

/* === Welcome === */
.welcome {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: 60px 20px;
    gap: 16px;
}

.welcome-icon {
    margin-bottom: 8px;
}

.welcome-icon svg {
    width: 64px;
    height: 64px;
}

.welcome h2 {
    font-size: 24px;
    font-weight: 600;
}

.welcome p {
    color: var(--text-secondary);
    font-size: 15px;
}

.suggestions {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-top: 16px;
    justify-content: center;
}

.suggestion {
    padding: 8px 16px;
    border: 1px solid var(--border);
    border-radius: 20px;
    background: var(--bg-secondary);
    color: var(--text-secondary);
    font-size: 13px;
    cursor: pointer;
    transition: all var(--transition);
}

.suggestion:hover {
    border-color: var(--accent);
    color: var(--accent);
    background: var(--bg-tertiary);
}

/* === Messages === */
.messages {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.message {
    display: flex;
    gap: 12px;
    max-width: 85%;
    animation: fadeIn 0.3s ease;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(8px); }
    to { opacity: 1; transform: translateY(0); }
}

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

.message-avatar {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 14px;
    font-weight: 600;
    flex-shrink: 0;
}

.message.ai .message-avatar {
    background: var(--accent);
    color: white;
}

.message.user .message-avatar {
    background: var(--bg-tertiary);
    color: var(--text-secondary);
}

.message-content {
    padding: 12px 16px;
    border-radius: var(--radius);
    line-height: 1.6;
    font-size: 14px;
    word-break: break-word;
}

.message.user .message-content {
    background: var(--msg-user);
    color: var(--msg-user-text);
    border-bottom-right-radius: 4px;
}

.message.ai .message-content {
    background: var(--msg-ai);
    color: var(--msg-ai-text);
    border: 1px solid var(--border);
    border-bottom-left-radius: 4px;
}

/* Markdown-like formatting in AI responses */
.message.ai .message-content p { margin-bottom: 8px; }
.message.ai .message-content p:last-child { margin-bottom: 0; }

.message.ai .message-content code {
    background: var(--bg-tertiary);
    padding: 2px 6px;
    border-radius: 4px;
    font-size: 13px;
    font-family: 'SF Mono', 'Fira Code', monospace;
}

.message.ai .message-content pre {
    background: var(--bg-tertiary);
    padding: 12px;
    border-radius: var(--radius-sm);
    overflow-x: auto;
    margin: 8px 0;
}

.message.ai .message-content pre code {
    background: none;
    padding: 0;
}

/* Typing indicator */
.typing-indicator {
    display: flex;
    gap: 4px;
    padding: 4px 0;
}

.typing-indicator span {
    width: 6px;
    height: 6px;
    background: var(--text-muted);
    border-radius: 50%;
    animation: typing 1.4s infinite;
}

.typing-indicator span:nth-child(2) { animation-delay: 0.2s; }
.typing-indicator span:nth-child(3) { animation-delay: 0.4s; }

@keyframes typing {
    0%, 60%, 100% { transform: translateY(0); opacity: 0.4; }
    30% { transform: translateY(-6px); opacity: 1; }
}

/* === Input area === */
.input-area {
    padding: 12px 20px 20px;
    border-top: 1px solid var(--border);
    background: var(--bg-secondary);
    flex-shrink: 0;
}

.input-form {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.input-wrapper {
    display: flex;
    align-items: flex-end;
    gap: 8px;
    background: var(--input-bg);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 8px 12px;
    transition: border-color var(--transition);
}

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

.input-wrapper textarea {
    flex: 1;
    border: none;
    outline: none;
    resize: none;
    background: transparent;
    color: var(--text);
    font-size: 14px;
    font-family: inherit;
    line-height: 1.5;
    max-height: 150px;
    padding: 4px 0;
}

.input-wrapper textarea::placeholder {
    color: var(--text-muted);
}

.btn-send {
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    border: none;
    border-radius: var(--radius-sm);
    background: var(--accent);
    color: white;
    cursor: pointer;
    transition: all var(--transition);
    flex-shrink: 0;
}

.btn-send:hover:not(:disabled) {
    background: var(--accent-hover);
}

.btn-send:disabled {
    opacity: 0.4;
    cursor: not-allowed;
}

.input-footer {
    display: flex;
    justify-content: center;
}

.model-info {
    font-size: 11px;
    color: var(--text-muted);
}

/* === Scrollbar === */
.chat-container::-webkit-scrollbar {
    width: 6px;
}

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

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

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

/* === Responsive === */
@media (max-width: 640px) {
    .app { max-width: 100%; }
    .header { padding: 10px 16px; }
    .chat-container { padding: 16px; }
    .input-area { padding: 10px 16px 16px; }
    .message { max-width: 92%; }
    .welcome { padding: 40px 16px; }
    .suggestions { flex-direction: column; }
}