:root {
    --bg-color: #1e1e2e;
    --sidebar-bg: #181825;
    --text-primary: #cdd6f4;
    --text-secondary: #a6adc8;
    --accent: #cba6f7;
    --accent-hover: #b4befe;
    --border-color: #313244;
    --message-user-bg: #313244;
    --message-bot-bg: transparent;
}

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

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-primary);
    display: flex;
    height: 100vh;
    overflow: hidden;
}

.app-container { display: flex; width: 100%; height: 100%; }

.sidebar {
    width: 280px;
    background-color: var(--sidebar-bg);
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
}

.sidebar-header { padding: 20px; }
.sidebar-header h2 { font-size: 1.2rem; margin-bottom: 15px; color: var(--accent); }

.btn {
    width: 100%; padding: 10px; border: none; border-radius: 8px;
    cursor: pointer; font-size: 0.95rem; font-weight: 500; transition: all 0.2s ease;
}

.primary-btn { background-color: var(--accent); color: #11111b; }
.primary-btn:hover { background-color: var(--accent-hover); }
.secondary-btn { background-color: var(--border-color); color: var(--text-primary); }
.secondary-btn:hover { background-color: #45475a; }

.tab-nav { display: flex; padding: 0 10px; gap: 5px; margin-bottom: 10px; }
.tab-btn {
    flex: 1; background: none; border: none; color: var(--text-secondary);
    padding: 8px; cursor: pointer; border-radius: 6px; font-weight: 500;
}
.tab-btn.active { background-color: var(--border-color); color: var(--text-primary); }

.sidebar-content { flex: 1; overflow-y: auto; padding: 10px; }
.session-item {
    padding: 10px; border-radius: 8px; cursor: pointer; color: var(--text-secondary);
    margin-bottom: 5px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
}
.session-item:hover { background-color: var(--border-color); }
.session-item.active { background-color: var(--message-user-bg); color: var(--text-primary); }

.sidebar-footer { padding: 20px; border-top: 1px solid var(--border-color); }

.main-content { flex: 1; display: flex; flex-direction: column; position: relative; }
.view-section { display: none; height: 100%; flex-direction: column; }
.view-section.active { display: flex; }

.chat-header {
    padding: 15px 20px; border-bottom: 1px solid var(--border-color);
    display: flex; align-items: center; justify-content: space-between;
}
.session-title-input {
    background: transparent; border: 1px solid transparent; color: var(--text-primary);
    font-size: 1.1rem; font-weight: 600; padding: 5px 10px; border-radius: 6px;
    width: 60%; outline: none; transition: border-color 0.2s;
}
.session-title-input:focus { border-color: var(--accent); }
.icon-btn {
    background: none; border: none; cursor: pointer; font-size: 1.2rem;
    color: var(--text-secondary); padding: 5px; border-radius: 6px;
}
.icon-btn:hover { background-color: var(--border-color); color: #f38ba8; }

.chat-messages {
    flex: 1; overflow-y: auto; padding: 20px 15%;
    display: flex; flex-direction: column; gap: 20px; scroll-behavior: smooth;
}

.message { display: flex; flex-direction: column; width: 100%; }
.message.user { align-items: flex-end; }
.message.user .message-content {
    background-color: var(--message-user-bg); padding: 12px 18px;
    border-radius: 18px; border-bottom-right-radius: 4px; max-width: 80%;
}
.message.assistant .message-content {
    align-self: flex-start; padding: 12px 0; width: 100%; line-height: 1.6;
}

.message-content img { max-width: 100%; border-radius: 8px; margin-top: 10px; }
.message-content p { margin-bottom: 10px; }
.message-content pre {
    background-color: #11111b; padding: 10px; border-radius: 6px; overflow-x: auto; margin: 10px 0;
}
.message-content code { background-color: #11111b; padding: 2px 4px; border-radius: 4px; font-family: monospace;}

.trajectory-container { margin-bottom: 15px; font-size: 0.9rem; }
.expander {
    background-color: var(--sidebar-bg); border: 1px solid var(--border-color);
    border-radius: 6px; margin-bottom: 8px; overflow: hidden;
}
.expander-header {
    padding: 10px 15px; cursor: pointer; display: flex; justify-content: space-between;
    background-color: #1e1e2e; font-weight: 500; color: var(--text-secondary);
}
.expander-header:hover { background-color: #313244; color: var(--text-primary); }
.expander-content {
    padding: 15px; display: none; border-top: 1px solid var(--border-color);
    max-height: 400px; overflow-y: auto;
}
.expander-content.show { display: block; }
.expander-content pre { margin: 0 0 10px 0; white-space: pre-wrap; word-wrap: break-word; overflow-wrap: break-word; font-family: monospace; }

.chat-input-container { padding: 20px 15%; position: relative; border-top: 1px solid var(--border-color); }
#chat-input {
    width: 100%; background-color: var(--sidebar-bg); border: 1px solid var(--border-color);
    color: var(--text-primary); padding: 15px 180px 15px 15px; border-radius: 12px;
    resize: none; height: 60px; font-family: inherit; font-size: 1rem; outline: none;
    transition: border-color 0.2s; line-height: 1.5;
}
#chat-input:focus { border-color: var(--accent); }
.input-actions {
    position: absolute; right: calc(15% + 10px); top: 50%; transform: translateY(-50%);
    display: flex; gap: 10px;
}
.send-btn {
    background-color: var(--accent); color: #11111b; border: none; padding: 8px 15px;
    border-radius: 8px; cursor: pointer; font-weight: 600;
}
.send-btn:disabled { background-color: var(--border-color); color: var(--text-secondary); cursor: not-allowed; }
.stop-btn {
    background-color: #ff4757; color: white; border: none; padding: 8px 15px;
    border-radius: 8px; cursor: pointer; font-weight: 600;
}
.stop-btn:hover { background-color: #ff6b81; }

.docs-content { padding: 40px 15%; overflow-y: auto; height: 100%; line-height: 1.6; }
.docs-content h1, .docs-content h2, .docs-content h3 { color: var(--accent); margin-bottom: 15px; margin-top: 25px;}
.docs-content table { width: 100%; border-collapse: collapse; margin-bottom: 20px; }
.docs-content th, .docs-content td { border: 1px solid var(--border-color); padding: 10px; text-align: left; }
.docs-content th { background-color: var(--sidebar-bg); }

.modal {
    position: fixed; top: 0; left: 0; width: 100%; height: 100%;
    background: rgba(0,0,0,0.6); display: flex; align-items: center; justify-content: center; z-index: 100;
}
.modal.hidden { display: none; }
.modal-content {
    background-color: var(--sidebar-bg); padding: 30px; border-radius: 12px;
    width: 400px; border: 1px solid var(--border-color);
}
.form-group { margin-bottom: 15px; }
.form-group label { display: block; margin-bottom: 5px; color: var(--text-secondary); }
.form-group input {
    width: 100%; padding: 10px; background-color: var(--bg-color);
    border: 1px solid var(--border-color); color: var(--text-primary); border-radius: 6px; outline: none;
}
.modal-actions { display: flex; gap: 10px; margin-top: 20px; }
.loading-spinner { display: flex; align-items: center; gap: 10px; color: var(--text-secondary); padding: 10px 0; }