:root {
    --background-color: #f4f4f9;
    --text-color: #333;
    --card-background: #fff;
    --border-color: #ddd;
    --primary-color: #007bff;
    --primary-color-hover: #0056b3;
    --input-background: #fff;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    margin: 0;
    background-color: var(--background-color);
    color: var(--text-color);
    transition: background-color 0.2s, color 0.2s;
}

body.dark-mode {
    --background-color: #121212;
    --text-color: #e0e0e0;
    --card-background: #1e1e1e;
    --border-color: #444;
    --primary-color: #008cff;
    --primary-color-hover: #006bb3;
    --input-background: #333;
}

nav {
    background-color: var(--card-background);
    padding: 1rem;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    gap: 1rem;
}

nav a {
    text-decoration: none;
    color: var(--primary-color);
    font-weight: 500;
}

nav a:hover {
    text-decoration: underline;
}

#authButton {
    margin-left: auto;
    padding: 0.5rem 1rem;
    border: none;
    background-color: var(--primary-color);
    color: white;
    border-radius: 5px;
    cursor: pointer;
}

#authButton:hover {
    background-color: var(--primary-color-hover);
}

main {
    padding: 2rem;
}

#app-root h1 {
    color: var(--text-color);
}

/* Chat UI */
.chat-container {
    display: flex;
    flex-direction: column;
    height: 70vh;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    background: var(--card-background);
}

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

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

.message-input input {
    flex-grow: 1;
    padding: 0.5rem;
    border: 1px solid var(--border-color);
    border-radius: 5px;
    background-color: var(--input-background);
    color: var(--text-color);
}

.message-input button {
    margin-left: 0.5rem;
    padding: 0.5rem 1rem;
    border: none;
    background-color: var(--primary-color);
    color: white;
    border-radius: 5px;
    cursor: pointer;
}

/* Settings Page */
.settings-section {
    background-color: var(--card-background);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 1.5rem;
    margin-bottom: 2rem;
}

.settings-section h2 {
    margin-top: 0;
}

.settings-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
}

.settings-row label {
    font-weight: 500;
}

.settings-row select, .settings-row button {
    padding: 0.5rem;
    border-radius: 5px;
    border: 1px solid var(--border-color);
    background-color: var(--input-background);
    color: var(--text-color);
}

.btn-danger {
    background-color: #dc3545;
    color: white;
    border-color: #dc3545;
}
.btn-danger:hover {
    background-color: #c82333;
}