:root {
    --bg-color: #ffffff;
    --text-color: #333333;
    --primary-color: #4a6fa5;
    --secondary-color: #f0f0f0;
    --border-color: #dddddd;
}

[data-theme="dark"] {
    --bg-color: #1a1a1a;
    --text-color: #f0f0f0;
    --primary-color: #6d8cc0;
    --secondary-color: #2d2d2d;
    --border-color: #444444;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    margin: 0;
    padding: 0;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    transition: background-color 0.3s, color 0.3s;
}

header {
    background-color: var(--primary-color);
    color: white;
    padding: 1rem;
    text-align: center;
}

.container {
    max-width: 800px;
    margin: 2rem auto;
    padding: 2rem;
    background-color: var(--secondary-color);
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    flex-grow: 1;
}

.controls {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
    margin-bottom: 2rem;
}

.form-group {
    flex: 1;
    min-width: 200px;
}

label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 600;
}

select, input[type="text"] {
    width: 100%;
    padding: 0.5rem;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    background-color: var(--bg-color);
    color: var(--text-color);
}

button {
    background-color: var(--primary-color);
    color: white;
    border: none;
    padding: 0.5rem 1rem;
    border-radius: 4px;
    cursor: pointer;
    transition: background-color 0.2s;
}

button:hover {
    filter: brightness(1.1);
}

.result {
    display: flex;
    margin-bottom: 2rem;
}

#password {
    flex: 1;
    padding: 0.5rem;
    border: 1px solid var(--border-color);
    border-radius: 4px 0 0 4px;
    background-color: var(--bg-color);
    color: var(--text-color);
}

#copyBtn {
    border-radius: 0 4px 4px 0;
}

.history {
    margin-top: 2rem;
}

#historyList {
    list-style: none;
    padding: 0;
}

#historyList li {
    padding: 0.5rem;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
}

.hidden {
    display: none;
}

footer {
    text-align: center;
    padding: 1rem;
    background-color: var(--primary-color);
    color: white;
    margin-top: auto;
}

/* Dark mode toggle specific styles */
#toggleDarkMode {
    background-color: transparent;
    border: 1px solid var(--primary-color);
    color: var(--primary-color);
}
select {
    padding: 0.5rem;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    background-color: var(--bg-color);
    color: var(--text-color);
    width: 100%;
}