:root {
    --primary-color: #00ff41;
    --bg-color: #0d1117;
    --chat-bg: #161b22;
    --text-color: #c9d1d9;
    --border-color: #30363d;
    --user-msg-bg: #1f6feb;
    --bot-msg-bg: #21262d;
}

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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    height: 100vh;
    display: flex;
    flex-direction: column;
}

.container {
    display: flex;
    flex-direction: column;
    height: 100%;
    max-width: 1400px;
    margin: 0 auto;
    width: 100%;
}

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

h1 {
    color: var(--primary-color);
    font-size: 1.5rem;
}

.level-selector {
    display: flex;
    align-items: center;
    gap: 1rem;
}

select {
    padding: 0.5rem;
    background-color: var(--bg-color);
    color: var(--text-color);
    border: 1px solid var(--border-color);
    border-radius: 4px;
    font-size: 1rem;
}

main {
    display: flex;
    flex: 1;
    overflow: hidden;
}

.sidebar {
    width: 300px;
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    background-color: var(--chat-bg);
}

.sidebar h2 {
    padding: 1rem;
    font-size: 1.2rem;
    border-bottom: 1px solid var(--border-color);
}

.restaurant-list {
    flex: 1;
    overflow-y: auto;
    padding: 1rem;
}

.restaurant-item {
    padding: 0.8rem;
    border-bottom: 1px solid var(--border-color);
    cursor: pointer;
    transition: background-color 0.2s;
}

.restaurant-item:hover {
    background-color: var(--border-color);
}

.restaurant-name {
    font-weight: bold;
    color: var(--primary-color);
}

.restaurant-cuisine {
    font-size: 0.9rem;
    color: #8b949e;
}

.chat-container {
    flex: 1;
    display: flex;
    flex-direction: column;
    background-color: var(--bg-color);
}

.chat-header {
    padding: 1rem;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.status {
    color: var(--primary-color);
    font-size: 0.9rem;
}

.chat-messages {
    flex: 1;
    overflow-y: auto;
    padding: 1rem;
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.message {
    max-width: 80%;
    padding: 1rem;
    border-radius: 8px;
    line-height: 1.5;
}

.message.user {
    align-self: flex-end;
    background-color: var(--user-msg-bg);
    color: white;
}

.message.assistant {
    align-self: flex-start;
    background-color: var(--bot-msg-bg);
    border: 1px solid var(--border-color);
}

.message.system {
    align-self: center;
    background-color: transparent;
    color: #8b949e;
    font-style: italic;
    text-align: center;
    border: 1px dashed var(--border-color);
}

.chat-input {
    padding: 1rem;
    border-top: 1px solid var(--border-color);
    display: flex;
    gap: 1rem;
    background-color: var(--chat-bg);
}

textarea {
    flex: 1;
    padding: 0.8rem;
    background-color: var(--bg-color);
    color: var(--text-color);
    border: 1px solid var(--border-color);
    border-radius: 4px;
    resize: none;
    height: 60px;
    font-family: inherit;
}

textarea:focus {
    outline: 1px solid var(--primary-color);
}

button {
    padding: 0 1.5rem;
    background-color: var(--primary-color);
    color: black;
    border: none;
    border-radius: 4px;
    font-weight: bold;
    cursor: pointer;
    transition: opacity 0.2s;
}

button:hover {
    opacity: 0.9;
}

button:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}