:root {
    --primary-color: #f39c12;
    --secondary-color: #e67e22;
    --background-color: #fdf6e3;
    --text-color: #333;
    --card-background: #ffffff;
    --shadow-color: rgba(0, 0, 0, 0.1);
    --button-text: #ffffff;
    --paragraph-color: #666;
}

body.dark-mode {
    --background-color: #1a1a1a;
    --text-color: #f0f0f0;
    --card-background: #2c2c2c;
    --shadow-color: rgba(0, 0, 0, 0.5);
    --paragraph-color: #bbb;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
    background-color: var(--background-color);
    color: var(--text-color);
    margin: 0;
    padding: 20px;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    background-image: linear-gradient(45deg, var(--primary-color), var(--secondary-color));
    transition: background-color 0.3s ease, color 0.3s ease;
}

.container {
    background-color: var(--card-background);
    padding: 40px;
    border-radius: 12px;
    box-shadow: 0 10px 30px var(--shadow-color);
    text-align: center;
    max-width: 500px;
    width: 100%;
    transition: transform 0.3s ease, box-shadow 0.3s ease, background-color 0.3s ease;
    position: relative;
}

.nav-link {
    display: inline-block;
    margin-bottom: 20px;
    color: var(--primary-color);
    text-decoration: none;
    font-weight: bold;
    font-size: 0.9em;
}

.nav-link:hover {
    text-decoration: underline;
}

.form-group {
    text-align: left;
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: bold;
    color: var(--text-color);
}

.form-group input, 
.form-group textarea {
    width: 100%;
    padding: 12px;
    border: 1px solid #ddd;
    border-radius: 6px;
    background-color: var(--card-background);
    color: var(--text-color);
    box-sizing: border-box;
    font-family: inherit;
}

body.dark-mode .form-group input,
body.dark-mode .form-group textarea {
    border-color: #444;
}

.form-group textarea {
    height: 120px;
    resize: vertical;
}

.container:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 40px var(--shadow-color);
}

#theme-toggle {
    position: absolute;
    top: 20px;
    right: 20px;
    background: none;
    border: 2px solid var(--primary-color);
    color: var(--primary-color);
    padding: 5px 10px;
    border-radius: 20px;
    cursor: pointer;
    font-size: 0.8em;
    font-weight: bold;
    transition: all 0.3s ease;
}

#theme-toggle:hover {
    background-color: var(--primary-color);
    color: var(--button-text);
}

h1 {
    color: var(--primary-color);
    font-size: 2.5em;
    margin-bottom: 10px;
}

p {
    color: var(--paragraph-color);
    font-size: 1.1em;
    line-height: 1.6;
}

#generate-button {
    padding: 15px 25px;
    font-size: 1em;
    font-weight: bold;
    color: var(--button-text);
    background-image: linear-gradient(45deg, var(--primary-color), var(--secondary-color));
    border: none;
    border-radius: 8px;
    cursor: pointer;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
    margin-top: 20px;
    margin-bottom: 30px;
}

#generate-button:hover {
    transform: scale(1.05);
    box-shadow: 0 5px 15px rgba(230, 126, 34, 0.4);
}

.main-container {
    max-width: 700px;
    padding: 30px;
}

.tabs {
    display: flex;
    justify-content: center;
    gap: 10px;
    margin-bottom: 25px;
    border-bottom: 2px solid var(--shadow-color);
    padding-bottom: 10px;
}

.tab-btn {
    padding: 10px 20px;
    border: none;
    background: none;
    color: var(--paragraph-color);
    font-size: 1.1em;
    font-weight: bold;
    cursor: pointer;
    transition: all 0.3s ease;
    border-radius: 8px 8px 0 0;
}

.tab-btn:hover {
    color: var(--primary-color);
    background-color: var(--shadow-color);
}

.tab-btn.active {
    color: var(--primary-color);
    border-bottom: 3px solid var(--primary-color);
}

.tab-content {
    display: none;
    text-align: left;
    animation: fadeIn 0.4s ease-out;
}

.tab-content.active {
    display: block;
}

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

.form-group select,
.form-group input[type="number"],
.form-group input[type="file"] {
    width: 100%;
    padding: 12px;
    border: 1px solid #ddd;
    border-radius: 6px;
    background-color: var(--card-background);
    color: var(--text-color);
    box-sizing: border-box;
    font-family: inherit;
    margin-top: 5px;
}

body.dark-mode .form-group select,
body.dark-mode .form-group input[type="number"],
body.dark-mode .form-group input[type="file"] {
    border-color: #444;
}

.action-btn {
    width: 100%;
    padding: 15px;
    font-size: 1.1em;
    font-weight: bold;
    color: var(--button-text);
    background-image: linear-gradient(45deg, var(--primary-color), var(--secondary-color));
    border: none;
    border-radius: 8px;
    cursor: pointer;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
    margin-top: 15px;
}

.action-btn:hover {
    transform: scale(1.02);
    box-shadow: 0 5px 15px rgba(230, 126, 34, 0.4);
}

.result-area {
    margin-top: 40px;
    padding: 20px;
    background-color: var(--shadow-color);
    border-radius: 10px;
    border-left: 5px solid var(--primary-color);
    text-align: left;
}

#generated-questions {
    margin-top: 15px;
}

.question-item {
    margin-bottom: 25px;
    padding-bottom: 15px;
    border-bottom: 1px dashed var(--paragraph-color);
}

.question-text {
    font-weight: bold;
    margin-bottom: 10px;
    display: block;
}

.options-list {
    list-style-type: none;
    padding-left: 0;
}

.options-list li {
    margin-bottom: 5px;
    padding: 5px 10px;
    background-color: var(--card-background);
    border-radius: 4px;
}

.secondary-btn {
    padding: 10px 20px;
    background-color: transparent;
    border: 2px solid var(--primary-color);
    color: var(--primary-color);
    border-radius: 6px;
    cursor: pointer;
    font-weight: bold;
    margin-top: 20px;
}

.secondary-btn:hover {
    background-color: var(--primary-color);
    color: var(--button-text);
}