:root {
    --bg-primary: #0a0a0a;
    --bg-secondary: #141414;
    --bg-tertiary: #1f1f1f;
    --text-primary: #f0f0f0;
    --text-secondary: #a0a0a0;
    --accent: #00ff88;
    --accent-hover: #00cc6a;
    --border: #2a2a2a;
    --danger: #ff4444;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
}

body {
    background-color: var(--bg-primary);
    color: var(--text-primary);
    height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
}

.app-container {
    width: 100%;
    max-width: 900px;
    height: 95vh;
    background-color: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 12px;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    box-shadow: 0 20px 50px rgba(0, 0, 0, 0.5);
}

.app-header {
    padding: 20px;
    border-bottom: 1px solid var(--border);
    display: flex;
    justify-content: space-between;
    align-items: center;
    background-color: var(--bg-tertiary);
}

.app-header h1 {
    font-size: 1.2rem;
    font-weight: 600;
    letter-spacing: 1px;
}

.status-indicator {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.dot {
    width: 8px;
    height: 8px;
    background-color: var(--accent);
    border-radius: 50%;
}

.pulse {
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0% { box-shadow: 0 0 0 0 rgba(0, 255, 136, 0.4); }
    70% { box-shadow: 0 0 0 6px rgba(0, 255, 136, 0); }
    100% { box-shadow: 0 0 0 0 rgba(0, 255, 136, 0); }
}

.chat-container {
    flex: 1;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

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

.message {
    display: flex;
    gap: 15px;
    max-width: 85%;
    animation: fadeIn 0.3s ease;
}

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

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

.system-message .avatar {
    background-color: var(--bg-tertiary);
    color: var(--accent);
    border: 1px solid var(--border);
}

.user-message .avatar {
    background-color: var(--accent);
    color: var(--bg-primary);
}

.avatar {
    width: 36px;
    height: 36px;
    border-radius: 8px;
    display: flex;
    justify-content: center;
    align-items: center;
    font-weight: 600;
    font-size: 0.9rem;
    flex-shrink: 0;
}

.content {
    background-color: var(--bg-tertiary);
    padding: 15px;
    border-radius: 8px;
    line-height: 1.5;
    font-size: 0.95rem;
    border: 1px solid var(--border);
}

.user-message .content {
    border-color: var(--accent);
    background-color: rgba(0, 255, 136, 0.05);
}

.content img {
    max-width: 100%;
    border-radius: 4px;
    margin-top: 10px;
}

.content pre {
    background-color: var(--bg-primary);
    padding: 10px;
    border-radius: 4px;
    overflow-x: auto;
    margin-top: 10px;
    border: 1px solid var(--border);
}

.input-area {
    padding: 20px;
    background-color: var(--bg-tertiary);
    border-top: 1px solid var(--border);
}

.dropzone {
    border: 1px dashed var(--border);
    border-radius: 8px;
    padding: 15px;
    text-align: center;
    margin-bottom: 15px;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    background-color: rgba(255, 255, 255, 0.02);
}

.dropzone:hover, .dropzone.dragover {
    border-color: var(--accent);
    color: var(--accent);
    background-color: rgba(0, 255, 136, 0.05);
}

.hidden-input {
    display: none;
}

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

textarea {
    flex: 1;
    background-color: var(--bg-primary);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 12px 15px;
    color: var(--text-primary);
    font-size: 0.95rem;
    resize: none;
    min-height: 44px;
    max-height: 150px;
    transition: border-color 0.2s;
}

textarea:focus {
    outline: none;
    border-color: var(--accent);
}

.send-btn {
    background-color: var(--accent);
    color: var(--bg-primary);
    border: none;
    border-radius: 8px;
    width: 44px;
    height: 44px;
    display: flex;
    justify-content: center;
    align-items: center;
    cursor: pointer;
    transition: background-color 0.2s;
    flex-shrink: 0;
}

.send-btn:hover {
    background-color: var(--accent-hover);
}

.send-btn:disabled {
    background-color: var(--border);
    color: var(--text-secondary);
    cursor: not-allowed;
}