:root {
    --bg-color: #f4f7f9;
    --text-color: #333;
    --container-bg: #fff;
    --card-bg: #fff;
    --card-border: #e0e0e0;
    --option-hover-bg: #f0f0f0;
    --header-color: #2c3e50;
    --subtle-text: #555;
    --button-bg: #3498db;
    --button-hover: #2980b9;
    --palette-bg: #f8f9fa;
    --palette-border: #ddd;
    --palette-btn-bg: #fff;
    --palette-btn-border: #bdc3c7;
    --palette-btn-hover-bg: #ecf0f1;
    --memory-aid-bg: #ecf0f1;
    --memory-aid-border: #95a5a6;
}

body.dark-mode {
    --bg-color: #2c3e50;
    --text-color: #ecf0f1;
    --container-bg: #34495e;
    --card-bg: #4a627a;
    --card-border: #5d7a99;
    --option-hover-bg: #5d7a99;
    --header-color: #ecf0f1;
    --subtle-text: #bdc3c7;
    --button-bg: #3498db;
    --button-hover: #2980b9;
    --palette-bg: #2c3e50;
    --palette-border: #4a627a;
    --palette-btn-bg: #34495e;
    --palette-btn-border: #7f8c8d;
    --palette-btn-hover-bg: #5d7a99;
    --memory-aid-bg: #2c3e50;
    --memory-aid-border: #7f8c8d;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.6;
    margin: 0;
    padding: 0; /* Padding moved to container */
    transition: background-color 0.3s, color 0.3s;
    /* iOS safe area support */
    padding-bottom: env(safe-area-inset-bottom);
}

body.quiz-active {
    padding-left: 280px;
}

    .container {
        max-width: 800px;
        margin: 20px auto;
        padding: 20px 30px;
        padding-bottom: calc(20px + env(safe-area-inset-bottom, 0px)); /* Account for iOS safe area */
        transition: margin-left 0.3s;
    }

.container.study-guide-active {
    max-width: 95%;
    margin: 20px;
}

.header-controls {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
    flex-wrap: wrap;
    gap: 15px;
}

.mobile-controls {
    display: flex;
    align-items: center;
    gap: 15px;
}

h1 {
    text-align: center;
    color: var(--header-color);
    margin: 0;
}

/* Theme Switcher Styles */
.theme-switcher-container {
    position: relative;
}
.theme-switcher {
    position: relative;
    display: inline-block;
    width: 60px;
    height: 34px;
}
.theme-switcher input {
    opacity: 0;
    width: 0;
    height: 0;
}
.slider {
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: #ccc;
    transition: .4s;
}
.slider:before {
    position: absolute;
    content: "";
    height: 26px;
    width: 26px;
    left: 4px;
    bottom: 4px;
    background-color: white;
    transition: .4s;
}

.sun-svg, .moon-svg {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    width: 20px;
    height: 20px;
    pointer-events: none;
}

.sun-svg {
    left: 7px;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='20' height='20' viewBox='0 0 24 24' fill='none' stroke='%23f1c40f' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Ccircle cx='12' cy='12' r='5'%3E%3C/circle%3E%3Cline x1='12' y1='1' x2='12' y2='3'%3E%3C/line%3E%3Cline x1='12' y1='21' x2='12' y2='23'%3E%3C/line%3E%3Cline x1='4.22' y1='4.22' x2='5.64' y2='5.64'%3E%3C/line%3E%3Cline x1='18.36' y1='18.36' x2='19.78' y2='19.78'%3E%3C/line%3E%3Cline x1='1' y1='12' x2='3' y2='12'%3E%3C/line%3E%3Cline x1='21' y1='12' x2='23' y2='12'%3E%3C/line%3E%3Cline x1='4.22' y1='19.78' x2='5.64' y2='18.36'%3E%3C/line%3E%3Cline x1='18.36' y1='5.64' x2='19.78' y2='4.22'%3E%3C/line%3E%3C/svg%3E");
    opacity: 1;
    transition: opacity 0.4s;
}

.moon-svg {
    right: 7px;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='20' height='20' viewBox='0 0 24 24' fill='none' stroke='%23333' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M21 12.79A9 9 0 1 1 11.21 3 7 7 0 0 0 21 12.79z'%3E%3C/path%3E%3C/svg%3E");
    opacity: 0;
    transition: opacity 0.4s;
}

input:checked ~ .slider .sun-svg {
    opacity: 0;
}

input:checked ~ .slider .moon-svg {
    opacity: 1;
}
input:checked + .slider {
    background-color: #2196F3;
}
input:focus + .slider {
    box-shadow: 0 0 1px #2196F3;
}
input:checked + .slider:before {
    transform: translateX(26px);
}
.slider.round {
    border-radius: 34px;
}
.slider.round:before {
    border-radius: 50%;
}


#quiz-setup {
    text-align: center;
    padding: 30px;
    border: 1px solid var(--card-border);
    border-radius: 8px;
    margin-bottom: 20px;
    background-color: var(--card-bg);
}

#quiz-setup h2 {
    margin-top: 0;
}

#quiz-setup label {
    display: block;
    margin-bottom: 15px;
}

.slider-container {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 15px;
    margin-bottom: 20px;
}

.slider-container input[type="range"] {
    flex-grow: 1;
    max-width: 400px;
}

.slider-container input[type="number"] {
    width: 80px;
    padding: 8px;
    font-size: 16px;
    text-align: center;
    background-color: var(--bg-color);
    color: var(--text-color);
    border: 1px solid var(--card-border);
}

#quiz-setup button {
    padding: 10px 20px;
    font-size: 16px;
    font-weight: bold;
    color: #fff;
    background-color: #27ae60;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    transition: background-color 0.3s;
}

#quiz-setup button:hover {
    background-color: #229954;
}

#progress-container {
    text-align: center;
    font-size: 1.1em;
    color: var(--subtle-text);
    margin-bottom: 15px;
}

.bottom-controls {
    position: fixed;
    top: 0;
    left: 0;
    width: 280px;
    height: 100%;
    z-index: 1000;
    display: none; /* Hidden by default, shown by JS */
    visibility: hidden; /* Additional hiding to prevent flash */
    background-color: var(--palette-bg);
    border-right: 1px solid var(--palette-border);
    box-shadow: 2px 0 5px rgba(0,0,0,0.05);
    transition: transform 0.3s, width 0.3s, height 0.3s, left 0.3s, top 0.3s;
    flex-direction: column;
}

.palette-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 20px;
    border-bottom: 1px solid var(--palette-border);
    background-color: var(--palette-bg);
}

.palette-title {
    font-weight: bold;
    font-size: 1.1em;
    color: var(--header-color);
}

#palette-close-btn {
    background: none;
    border: none;
    font-size: 24px;
    font-weight: bold;
    color: var(--text-color);
    cursor: pointer;
    padding: 0;
    width: 30px;
    height: 30px;
    display: none; /* Hidden on desktop */
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    transition: background-color 0.3s;
}

#palette-close-btn:hover {
    background-color: var(--option-hover-bg);
}

#palette-legend {
    display: flex;
    justify-content: center;
    gap: 20px;
    margin-top: 10px;
    padding-bottom: 10px;
    flex-wrap: wrap;
}

.legend-item {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.9em;
}

.legend-color-box {
    width: 18px;
    height: 18px;
    border: 1px solid var(--palette-btn-border);
    border-radius: 4px;
}

.legend-color-box.correct {
    background-color: #d4edda;
}

.legend-color-box.incorrect {
    background-color: #f8d7da;
}

.legend-color-box.flagged {
    background-color: #f1c40f;
}

.legend-color-box.current {
    border-color: #3498db;
    border-width: 2px;
}

#question-palette {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 8px;
    padding: 15px;
    overflow-y: auto;
    height: 100%;
    flex: 1;
}

#palette-pagination {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 15px;
    padding: 10px 0;
    border-top: 1px solid var(--palette-border);
}

#palette-pagination button {
    background: var(--button-bg);
    color: white;
    border: none;
    border-radius: 5px;
    width: 40px;
    height: 40px;
    font-size: 1.2em;
    cursor: pointer;
    transition: background-color 0.2s;
}

#palette-pagination button:disabled {
    background-color: #bdc3c7;
    cursor: not-allowed;
    opacity: 0.5;
}

#palette-page-info {
    font-weight: bold;
    font-size: 1.1em;
}

.palette-btn {
    padding: 10px 5px;
    font-size: 1em;
    border-radius: 5px;
    border: 1px solid var(--palette-btn-border);
    background-color: var(--palette-btn-bg);
    color: var(--text-color);
    cursor: pointer;
    transition: all 0.2s;
}

.palette-btn:hover {
    background-color: var(--palette-btn-hover-bg);
    border-color: #3498db;
}

.palette-btn.current {
    border-color: #3498db;
    border-width: 2px;
    font-weight: bold;
}

.palette-btn.correct {
    background-color: #d4edda;
    border-color: #c3e6cb;
    color: #155724;
}

.palette-btn.incorrect {
    background-color: #f8d7da;
    border-color: #f5c6cb;
    color: #721c24;
}

body.dark-mode .palette-btn.correct,
body.dark-mode .palette-btn.incorrect,
body.dark-mode .palette-btn.flagged {
    color: #333; /* Ensure text is dark on these light-colored backgrounds */
}

.palette-btn.flagged {
    background-color: #f1c40f;
    border-color: #f39c12;
    color: #333;
}

.question-card {
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: 8px;
    padding: 20px;
    margin-bottom: 20px;
    box-shadow: 0 1px 4px rgba(0,0,0,0.05);
}

.question-card h2 {
    font-size: 1em;
    color: #7f8c8d;
    border-bottom: 1px solid #ecf0f1;
    padding-bottom: 10px;
    margin-bottom: 15px;
}

.question-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: 15px;
}

.question-card h3 {
    margin-top: 0;
    color: var(--header-color);
    flex-grow: 1;
}

#question-text span.highlight {
    color: var(--button-bg);
    font-weight: bold;
    transform: scale(1.05);
    transition: all 0.15s ease;
}

#read-aloud-btn {
    background: none;
    border: none;
    cursor: pointer;
    padding: 0;
    color: var(--text-color);
    transition: color 0.2s;
}

#read-aloud-btn svg {
    width: 24px;
    height: 24px;
}

#read-aloud-btn:hover {
    color: var(--button-bg);
}

#read-aloud-btn.active {
    color: var(--button-bg);
}

#flag-btn {
    background: none;
    border: 1px solid transparent;
    font-size: 1.5em;
    cursor: pointer;
    padding: 0;
    line-height: 1;
    transition: transform 0.2s;
}

#flag-btn:hover {
    transform: scale(1.2);
}

#flag-btn.flagged {
    /* A simple way to show it's active, e.g., by removing transparency or changing color */
    /* For emoji, this might not be very visible, but demonstrates the state change */
    opacity: 0.5;
}

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

.options-list li {
    padding: 10px;
    margin-bottom: 8px;
    border-radius: 5px;
    border: 1px solid var(--card-border);
    cursor: pointer;
    transition: background-color 0.2s, border-color 0.2s;
}

.options-list li:hover {
    background-color: var(--option-hover-bg);
}

.options-list li.selected {
    background-color: #e0eafc;
    border-color: #3498db;
}

.options-list li.correct {
    background-color: #d4edda;
    border-color: #c3e6cb;
    color: #155724;
}

.options-list li.incorrect {
    background-color: #f8d7da;
    border-color: #f5c6cb;
    color: #721c24;
}

body.dark-mode .options-list li.correct,
body.dark-mode .options-list li.incorrect {
    color: #333; /* Ensure text is dark on these light-colored backgrounds */
}

.options-list.disabled {
    pointer-events: none;
}

#study-guide-container {
    margin-top: 20px;
}

#study-guide-toggle {
    width: 100%;
    padding: 10px;
    font-size: 1em;
    background-color: #95a5a6;
    color: white;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    margin-bottom: 10px;
}

#study-guide-toggle:hover {
    background-color: #7f8c8d;
}

#study-guide-content {
    padding: 20px;
    background-color: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: 8px;
}

#study-guide-content h4 {
    margin-top: 0;
    color: var(--header-color);
    border-bottom: 2px solid var(--button-bg);
    padding-bottom: 5px;
}

#study-guide-content h5 {
    margin-top: 15px;
    margin-bottom: 5px;
    color: var(--header-color);
}

#study-guide-content ul {
    padding-left: 20px;
    margin: 0;
}

#feedback-container {
    margin-top: 15px;
    display: none;
}

.feedback-header {
    font-size: 1.2em;
    font-weight: bold;
    margin-bottom: 10px;
}

.feedback-header.correct {
    color: #2ecc71;
}

.feedback-header.incorrect {
    color: #e74c3c;
}

.explanation-content {
    background-color: var(--palette-bg);
    border: 1px solid var(--palette-border);
    padding: 15px;
    border-radius: 5px;
}

.explanation-content .correct-answer {
    color: #2ecc71;
    font-weight: bold;
}

.explanation-content .incorrect-answer {
    color: #e74c3c;
    font-weight: bold;
}

.explanation-content .key-term {
    background-color: var(--button-bg);
    color: white;
    padding: 2px 5px;
    border-radius: 3px;
}

.explanation-content h4 {
    margin-top: 0;
    color: var(--header-color);
    border-bottom: 2px solid var(--button-bg);
    padding-bottom: 5px;
    display: inline-block;
}

.explanation-content h5 {
    margin-top: 15px;
    margin-bottom: 5px;
    color: #c0392b;
}

.explanation-content ul {
    padding-left: 20px;
    margin: 0;
    list-style-type: none;
}

.explanation-content ul li {
    margin-bottom: 5px;
}

#navigation-buttons {
    display: flex;
    justify-content: center;
    gap: 20px;
    margin-top: 20px;
}

#prev-btn, #next-btn, #restart-btn {
    padding: 15px;
    font-size: 18px;
    font-weight: bold;
    color: #fff;
    background-color: var(--button-bg);
    border: none;
    border-radius: 5px;
    cursor: pointer;
    transition: background-color 0.3s;
}

#prev-btn, #next-btn {
    width: 200px;
}

#restart-btn {
    width: 100%;
}

#prev-btn:hover, #next-btn:hover, #restart-btn:hover {
    background-color: var(--button-hover);
}

#prev-btn[disabled] {
    background-color: #bdc3c7;
    cursor: not-allowed;
    color: #7f8c8d;
}

#results-container {
    text-align: center;
    padding: 20px;
}

#summary-container .result-card {
    padding: 15px;
    margin-bottom: 25px;
    border-radius: 8px;
    text-align: left;
    border: 1px solid var(--card-border);
    background-color: var(--card-bg);
}

#summary-container .result-card ul {
    list-style: none;
    padding: 0;
    margin: 10px 0;
}

#summary-container .result-card li {
    padding: 10px;
    border-radius: 5px;
    border: 1px solid var(--card-border);
    margin-bottom: 8px;
}

#summary-container .result-card li.correct {
    background-color: #d4edda;
    border-color: #c3e6cb;
    color: #155724;
    font-weight: bold;
}

#summary-container .result-card li.incorrect {
    background-color: #f8d7da;
    border-color: #f5c6cb;
    color: #721c24;
    text-decoration: line-through;
}

body.dark-mode #summary-container .result-card li.correct,
body.dark-mode #summary-container .result-card li.incorrect {
    color: #333; /* Ensure text is dark on these light-colored backgrounds */
}

.result-card.correct {
    background-color: #d4edda;
    border: 1px solid #c3e6cb;
    color: #155724;
}

.result-card.incorrect {
    background-color: #f8d7da;
    border: 1px solid #f5c6cb;
    color: #721c24;
}

.result-card p {
    margin: 5px 0;
}

.explanation-content .memory-aid, .result-card .memory-aid {
    font-style: italic;
    margin-top: 15px;
    padding: 10px;
    background-color: var(--memory-aid-bg);
    border-left: 4px solid var(--memory-aid-border);
    color: var(--text-color);
}

#palette-toggle-btn {
    display: none; /* Hidden by default and on desktop */
    position: fixed;
    top: 20px;
    left: 20px;
    z-index: 1001;
    background-color: var(--button-bg);
    color: white;
    border: none;
    border-radius: 50%;
    width: 50px;
    height: 50px;
    font-size: 24px;
    cursor: pointer;
    box-shadow: 0 2px 5px rgba(0,0,0,0.2);
}

/* Mode Switcher Styles */
.mode-switcher {
    display: flex;
    gap: 5px;
    background-color: var(--palette-bg);
    border-radius: 8px;
    padding: 4px;
    border: 1px solid var(--palette-border);
}

.mode-btn {
    padding: 8px 16px;
    border: none;
    border-radius: 4px;
    background-color: transparent;
    color: var(--text-color);
    cursor: pointer;
    transition: all 0.3s;
    font-size: 14px;
    font-weight: 500;
}

.mode-btn.active {
    background-color: var(--button-bg);
    color: white;
}

.mode-btn:hover:not(.active) {
    background-color: var(--option-hover-bg);
}

/* Study Guide Layout */
#study-guide-mode {
    display: none; /* Initially hidden to prevent flash on page load */
}

.study-guide-layout {
    display: flex;
    height: calc(100vh - 120px);
    gap: 20px;
}

.study-guide-sidebar {
    width: 300px;
    background-color: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: 8px;
    padding: 20px;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.study-guide-main {
    flex: 1;
    background-color: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: 8px;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

/* Study Guide Search */
.study-guide-search {
    display: flex;
    gap: 8px;
}

#study-search {
    flex: 1;
    padding: 10px;
    border: 1px solid var(--card-border);
    border-radius: 5px;
    background-color: var(--bg-color);
    color: var(--text-color);
    font-size: 14px;
}

#search-btn {
    padding: 10px 12px;
    border: 1px solid var(--card-border);
    border-radius: 5px;
    background-color: var(--button-bg);
    color: white;
    cursor: pointer;
    transition: background-color 0.3s;
}

#search-btn:hover {
    background-color: var(--button-hover);
}

/* Progress Overview */
.study-guide-progress h3 {
    margin: 0 0 15px 0;
    color: var(--header-color);
    font-size: 1.1em;
}

.progress-stats {
    display: flex;
    gap: 20px;
}

.stat {
    text-align: center;
    flex: 1;
}

.stat-number {
    display: block;
    font-size: 2em;
    font-weight: bold;
    color: var(--button-bg);
}

.stat-label {
    display: block;
    font-size: 0.9em;
    color: var(--subtle-text);
}

/* Study Guide Navigation */
.study-guide-nav {
    flex: 1;
}

#study-nav-tree {
    font-size: 14px;
}

.domain-item {
    margin-bottom: 10px;
}

.domain-header {
    padding: 8px 12px;
    background-color: var(--palette-bg);
    border: 1px solid var(--palette-border);
    border-radius: 5px;
    cursor: pointer;
    font-weight: bold;
    color: var(--header-color);
    transition: background-color 0.3s;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.domain-header:hover {
    background-color: var(--option-hover-bg);
}

.domain-header.expanded {
    border-bottom-left-radius: 0;
    border-bottom-right-radius: 0;
}

.domain-toggle {
    font-size: 12px;
    transition: transform 0.3s;
}

.domain-header.expanded .domain-toggle {
    transform: rotate(90deg);
}

.objectives-list {
    border: 1px solid var(--palette-border);
    border-top: none;
    border-radius: 0 0 5px 5px;
    background-color: var(--card-bg);
    display: none;
}

.objectives-list.expanded {
    display: block;
}

.objective-item {
    padding: 8px 16px;
    border-bottom: 1px solid var(--palette-border);
    cursor: pointer;
    transition: background-color 0.3s;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.objective-item:last-child {
    border-bottom: none;
}

.objective-item:hover {
    background-color: var(--option-hover-bg);
}

.objective-item.active {
    background-color: var(--button-bg);
    color: white;
}

.objective-item.studied {
    background-color: #d4edda;
    border-left: 4px solid #28a745;
}

body.dark-mode .objective-item.studied {
    color: #333;
}

.objective-status {
    font-size: 12px;
}

/* Study Guide Toolbar */
.study-guide-toolbar {
    padding: 15px 20px;
    border-bottom: 1px solid var(--card-border);
    display: flex;
    gap: 10px;
    background-color: var(--palette-bg);
}

.study-guide-toolbar button {
    padding: 8px 12px;
    border: 1px solid var(--palette-border);
    border-radius: 5px;
    background-color: var(--palette-btn-bg);
    color: var(--text-color);
    cursor: pointer;
    transition: all 0.3s;
    font-size: 14px;
}

.study-guide-toolbar button:hover {
    background-color: var(--option-hover-bg);
}

.study-guide-toolbar button.active {
    background-color: var(--button-bg);
    color: white;
}

/* Study Guide Content */
#study-guide-content-main {
    flex: 1;
    padding: 20px;
    overflow-y: auto;
}

.study-guide-welcome {
    text-align: center;
    max-width: 800px;
    margin: 0 auto;
}

.study-guide-welcome h2 {
    color: var(--header-color);
    margin-bottom: 20px;
}

.domain-overview {
    margin-top: 40px;
}

.domain-overview h3 {
    color: var(--header-color);
    margin-bottom: 20px;
}

.domain-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
    margin-top: 20px;
}

.domain-card {
    padding: 20px;
    border: 1px solid var(--card-border);
    border-radius: 8px;
    background-color: var(--palette-bg);
    cursor: pointer;
    transition: all 0.3s;
    text-align: left;
}

.domain-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(0,0,0,0.1);
    border-color: var(--button-bg);
}

.domain-card h4 {
    margin: 0 0 10px 0;
    color: var(--button-bg);
    font-size: 1.2em;
}

.domain-card p {
    margin: 0 0 15px 0;
    color: var(--text-color);
}

.objective-count {
    font-size: 0.9em;
    color: var(--subtle-text);
    font-style: italic;
}

/* Study Content Display */
.study-content {
    max-width: 800px;
    margin: 0 auto;
    line-height: 1.8;
}

.study-content h3 {
    color: #ffffff;
    background: linear-gradient(135deg, #2c3e50, #3498db);
    border-bottom: 3px solid #e74c3c;
    padding: 20px;
    margin-bottom: 25px;
    font-size: 1.8em;
    font-weight: bold;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.study-content h4 {
    color: #ffffff;
    margin-top: 30px;
    margin-bottom: 20px;
    font-size: 1.4em;
    font-weight: bold;
    background: linear-gradient(135deg, #27ae60, #2ecc71);
    padding: 15px 20px;
    border-left: 4px solid #f39c12;
    border-radius: 5px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.study-content h5 {
    color: #ffffff;
    margin-top: 25px;
    margin-bottom: 15px;
    font-size: 1.2em;
    font-weight: 600;
    background: linear-gradient(135deg, #8e44ad, #9b59b6);
    padding: 10px 15px;
    border-left: 3px solid #e67e22;
    border-radius: 4px;
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
}

.study-content ul, .study-content ol {
    margin-bottom: 20px;
    padding-left: 25px;
}

.study-content li {
    margin-bottom: 8px;
}

.study-content strong {
    color: var(--header-color);
}

.study-content .key-term {
    background-color: var(--button-bg);
    color: white;
    padding: 2px 5px;
    border-radius: 3px;
    font-weight: bold;
}

/* Study Notes Panel */
#study-notes-panel {
    padding: 20px;
    border-top: 1px solid var(--card-border);
    background-color: var(--palette-bg);
}

#study-notes-panel h3 {
    margin: 0 0 15px 0;
    color: var(--header-color);
}

#study-notes-text {
    width: 100%;
    height: 150px;
    padding: 10px;
    border: 1px solid var(--card-border);
    border-radius: 5px;
    background-color: var(--bg-color);
    color: var(--text-color);
    font-family: inherit;
    resize: vertical;
}

.notes-buttons {
    margin-top: 10px;
    display: flex;
    gap: 10px;
}

.notes-buttons button {
    padding: 8px 16px;
    border: 1px solid var(--card-border);
    border-radius: 5px;
    background-color: var(--button-bg);
    color: white;
    cursor: pointer;
    transition: background-color 0.3s;
}

.notes-buttons button:hover {
    background-color: var(--button-hover);
}

#close-notes-btn {
    background-color: var(--subtle-text);
}

#close-notes-btn:hover {
    background-color: #5a6c7d;
}

/* Search Results Styles */
.search-results {
    background-color: var(--palette-bg);
    border: 1px solid var(--card-border);
    border-radius: 8px;
    padding: 15px;
    margin-bottom: 20px;
}

.search-results h4 {
    margin: 0 0 15px 0;
    color: var(--header-color);
}

.search-results ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

.search-results li {
    margin-bottom: 8px;
}

.search-results a {
    color: var(--button-bg);
    text-decoration: none;
    padding: 5px 10px;
    border-radius: 3px;
    display: block;
    transition: background-color 0.3s;
}

.search-results a:hover {
    background-color: var(--option-hover-bg);
}

#objective-dropdown-container {
  margin: 1em 0;
  position: relative;
}

.dropdown-wrapper {
  position: relative;
  display: inline-block;
  /* width: 100%; removed to keep wrapper as wide as select */
}

#objective-dropdown {
  width: 330px;
  min-width: 300px;
  padding: 0.18em 2.2em 0.18em 0.7em; /* extra right padding for arrow */
  border: 1.2px solid #bbb;
  border-radius: 5px;
  font-size: 1em;
  font-family: inherit;
  background: #f9f9fc;
  box-shadow: 0 1px 4px rgba(60,60,90,0.04);
  transition: border-color 0.2s, box-shadow 0.2s;
  appearance: none;
  outline: none;
  background-image: none;
}

.dropdown-wrapper::after {
  content: '';
  position: absolute;
  top: 50%;
  right: 0.7em;
  width: 1em;
  height: 1em;
  pointer-events: none;
  transform: translateY(-50%);
  background-image: url('data:image/svg+xml;utf8,<svg width="16" height="16" viewBox="0 0 18 18" fill="none" xmlns="http://www.w3.org/2000/svg"><path d="M4.5 7.5L9 12L13.5 7.5" stroke="%23333" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"/></svg>');
  background-size: 1em 1em;
  background-repeat: no-repeat;
  background-position: center;
}

#objective-dropdown option {
  padding: 0.18em 0.5em;
  background-image: none !important;
}

select:focus > option {
  background-image: none !important;
}

@media (max-width: 1200px) and (min-width: 769px) {
    body.quiz-active {
        padding-left: 280px;
    }
    .bottom-controls {
        width: 280px;
        height: 100%;
        top: 0;
        left: 0;
        bottom: auto;
        border-top: none;
        border-right: 1px solid var(--palette-border);
        box-shadow: 2px 0 5px rgba(0,0,0,0.05);
        display: flex;
        flex-direction: column;
    }
    #question-palette {
        display: grid;
        grid-template-columns: repeat(4, 1fr);
        gap: 8px;
        padding: 15px;
        overflow-y: auto;
        height: 100%;
    }
    #palette-pagination {
        flex-shrink: 0;
    }
    .container {
        margin: 20px auto;
    }
}

@media (max-width: 768px) {
    * {
        box-sizing: border-box;
    }
    
    body {
        padding: 0;
        overflow-x: hidden;
    }
    
    body.quiz-active {
        padding-left: 0;
    }
    
    .container {
        margin: 0;
        padding: 10px;
        padding-bottom: calc(10px + env(safe-area-inset-bottom, 0px)); /* Account for iOS safe area */
        max-width: none;
        width: 100%;
        box-sizing: border-box;
        overflow-x: hidden;
    }
    
    #palette-toggle-btn {
        display: none;
        width: 40px;
        height: 40px;
        font-size: 18px;
    }
    
    body.quiz-active #palette-toggle-btn {
        display: block;
    }
    .bottom-controls {
        transform: translateX(-100%);
        width: 280px;
        height: 100%;
        top: 0;
        left: 0;
        bottom: auto;
        border-top: none;
        border-right: 1px solid var(--palette-border);
        box-shadow: 2px 0 5px rgba(0,0,0,0.05);
        display: flex;
        flex-direction: column;
    }
    .bottom-controls.open {
        transform: translateX(0);
    }
    #question-palette {
        display: grid;
        grid-template-columns: repeat(4, 1fr);
        gap: 8px;
        padding: 15px;
        overflow-y: auto;
        height: 100%;
    }
    #palette-pagination {
        flex-shrink: 0;
    }
    
    /* Show close button only on mobile */
    #palette-close-btn {
        display: flex !important;
    }
    
    /* Header improvements */
    .header-controls {
        flex-direction: column;
        gap: 10px;
        text-align: center;
        margin-bottom: 15px;
    }
    
    h1 {
        font-size: 1.2em;
        margin: 0;
        line-height: 1.2;
    }
    
    .mobile-controls {
        display: flex;
        justify-content: center;
        align-items: center;
        gap: 15px;
        flex-wrap: wrap;
    }
    
    .mode-switcher {
        flex-direction: row;
        width: auto;
        max-width: none;
        margin: 0;
    }
    
    .mode-btn {
        padding: 8px 12px;
        font-size: 13px;
        flex: none;
        min-width: 80px;
    }
    
    .theme-switcher-container {
        flex-shrink: 0;
    }
    
    /* Quiz setup improvements */
    #quiz-setup {
        padding: 20px 15px;
        margin-bottom: 15px;
    }
    
    #quiz-setup h2 {
        font-size: 1.3em;
        margin-bottom: 15px;
    }
    
    #quiz-setup label {
        font-size: 1em;
        margin-bottom: 10px;
    }
    
    .slider-container {
        flex-direction: column;
        gap: 10px;
        margin-bottom: 15px;
    }
    
    .slider-container input[type="range"] {
        width: 100%;
        max-width: none;
    }
    
    .slider-container input[type="number"] {
        width: 100px;
        padding: 10px;
        font-size: 16px;
        border-radius: 5px;
    }
    
    #quiz-setup button {
        padding: 12px 20px;
        font-size: 16px;
        width: 100%;
        max-width: 250px;
        margin: 0 auto;
        display: block;
    }
    
    /* Question card improvements */
    .question-card {
        padding: 15px;
        margin-bottom: 15px;
        box-sizing: border-box;
        word-wrap: break-word;
        overflow-wrap: break-word;
    }
    
    .question-header {
        position: relative;
        padding-right: 45px;
        margin-bottom: 15px;
    }
    
    .question-card h2 {
        font-size: 0.9em;
        margin-bottom: 10px;
        word-wrap: break-word;
    }
    
    .question-card h3 {
        font-size: 1.1em;
        line-height: 1.3;
        margin: 0;
        word-wrap: break-word;
        max-width: 100%;
    }
    
    #flag-btn {
        font-size: 1.3em;
        padding: 5px;
        min-width: 35px;
        height: 35px;
        position: absolute;
        top: 0;
        right: 0;
        z-index: 10;
    }
    
    /* Options list improvements */
    .options-list {
        box-sizing: border-box;
        width: 100%;
        overflow-x: hidden;
    }
    
    .options-list li {
        padding: 12px;
        margin-bottom: 10px;
        font-size: 1em;
        line-height: 1.4;
        border-radius: 8px;
        touch-action: manipulation;
        box-sizing: border-box;
        word-wrap: break-word;
        overflow-wrap: break-word;
        max-width: 100%;
    }
    
    /* Progress and navigation improvements */
    #progress-container {
        font-size: 1em;
        margin-bottom: 10px;
        padding: 0 5px;
    }
    
    #navigation-buttons {
        flex-direction: row;
        gap: 10px;
        margin-top: 15px;
        margin-bottom: 50px; /* Add bottom margin to avoid iOS navigation bar */
        padding: 0 5px;
        justify-content: space-between;
    }
    
    #prev-btn, #next-btn {
        flex: 1;
        padding: 15px 12px; /* Increased vertical padding for better touch targets */
        font-size: 16px;
        border-radius: 8px;
        touch-action: manipulation;
        max-width: 48%;
        min-height: 44px; /* Ensure minimum touch target size */
    }
    
    #prev-btn {
        order: 1;
    }
    
    #next-btn {
        order: 2;
    }
    
    /* Center next button when previous is hidden */
    #navigation-buttons:has(#prev-btn[style*="display: none"]) {
        justify-content: center;
    }
    
    #navigation-buttons:has(#prev-btn[style*="display: none"]) #next-btn {
        max-width: 60%;
        flex: none;
    }
    
    /* Study Guide Responsive */
    .study-guide-layout {
        flex-direction: column;
        height: auto;
        gap: 10px;
    }
    
    /* Mobile Navigation Toggle */
    .mobile-study-nav-toggle {
        display: block !important;
        width: 100%;
        padding: 12px 15px;
        background-color: var(--button-bg);
        color: white;
        border: none;
        border-radius: 8px;
        font-size: 16px;
        font-weight: bold;
        cursor: pointer;
        margin-bottom: 15px;
        transition: background-color 0.3s;
    }
    
    .mobile-study-nav-toggle:hover {
        background-color: var(--button-hover);
    }
    
    .mobile-study-nav-toggle::after {
        content: " ▼";
        font-size: 12px;
        margin-left: 8px;
        transition: transform 0.3s;
    }
    
    .mobile-study-nav-toggle.open::after {
        transform: rotate(180deg);
    }
    
    .study-guide-sidebar {
        width: 100%;
        max-height: none;
        height: auto;
        margin-bottom: 15px;
        padding: 0;
        order: 1;
        background-color: transparent;
        border: none;
        border-radius: 0;
    }
    
    .study-guide-sidebar.collapsed {
        display: none;
    }
    
    .study-guide-nav {
        background-color: var(--card-bg);
        border: 1px solid var(--card-border);
        border-radius: 8px;
        padding: 15px;
        margin-bottom: 15px;
    }
    
    .study-guide-nav h3 {
        margin: 0 0 15px 0;
        padding-bottom: 10px;
        border-bottom: 2px solid var(--button-bg);
        color: var(--header-color);
        font-size: 1.1em;
    }
    
    .study-guide-progress {
        background-color: var(--card-bg);
        border: 1px solid var(--card-border);
        border-radius: 8px;
        padding: 15px;
        margin-bottom: 15px;
    }
    
    .study-guide-search {
        background-color: var(--card-bg);
        border: 1px solid var(--card-border);
        border-radius: 8px;
        padding: 15px;
        margin-bottom: 15px;
    }
    
    .study-guide-search h3 {
        margin: 0 0 10px 0;
        color: var(--header-color);
        font-size: 1em;
    }
    
    .study-guide-search input,
    .study-guide-search button {
        width: 100%;
        margin-bottom: 8px;
    }
    
    .study-guide-search button {
        margin-bottom: 0;
    }
    
    .study-guide-main {
        margin-bottom: 15px;
        order: 2;
        min-height: 300px;
    }
    
    .study-guide-toolbar {
        padding: 10px 15px;
        flex-wrap: wrap;
        gap: 8px;
        justify-content: center;
    }
    
    .study-guide-toolbar button {
        padding: 8px 12px;
        font-size: 13px;
        min-width: 70px;
        border-radius: 6px;
    }
    
    #study-guide-content-main {
        padding: 15px;
    }
    
    .study-guide-welcome h2 {
        font-size: 1.3em;
        margin-bottom: 15px;
        text-align: center;
    }
    
    .study-guide-welcome p {
        text-align: center;
        margin-bottom: 20px;
        font-size: 0.95em;
        line-height: 1.5;
    }
    
    .domain-overview h3 {
        font-size: 1.2em;
        text-align: center;
        margin-bottom: 20px;
    }
    
    .domain-cards {
        grid-template-columns: 1fr;
        gap: 12px;
    }
    
    .domain-card {
        padding: 15px;
        text-align: center;
        border: 2px solid var(--card-border);
        transition: all 0.3s;
    }
    
    .domain-card:hover {
        border-color: var(--button-bg);
        transform: translateY(-2px);
        box-shadow: 0 4px 12px rgba(0,0,0,0.15);
    }
    
    .domain-card h4 {
        font-size: 1.1em;
        margin-bottom: 8px;
    }
    
    .domain-card p {
        font-size: 0.9em;
        margin-bottom: 8px;
    }
    
    .objective-count {
        font-size: 0.8em;
        font-weight: bold;
        color: var(--button-bg);
    }
    
    .progress-stats {
        display: grid;
        grid-template-columns: 1fr 1fr;
        gap: 10px;
        margin-top: 10px;
    }
    
    .stat {
        padding: 12px;
        background-color: var(--palette-bg);
        border-radius: 8px;
        border: 1px solid var(--palette-border);
        text-align: center;
    }
    
    .stat-number {
        font-size: 1.5em;
        margin-bottom: 5px;
    }
    
    .stat-label {
        font-size: 0.85em;
    }
    
    .domain-header {
        font-size: 1em;
        padding: 10px 12px;
        margin-bottom: 5px;
    }
    
    .objective-item {
        padding: 8px 12px;
        font-size: 0.9em;
        margin-bottom: 2px;
    }
    
    #study-nav-tree {
        font-size: 14px;
    }
    
    .study-content h3 {
        font-size: 1.3em;
        padding: 12px 15px;
        margin-bottom: 18px;
    }
    
    .study-content h4 {
        font-size: 1.1em;
        padding: 10px 12px;
        margin-top: 18px;
        margin-bottom: 12px;
    }
    
    .study-content h5 {
        font-size: 1em;
        padding: 8px 10px;
        margin-top: 15px;
        margin-bottom: 8px;
    }
    
    .study-content ul,
    .study-content ol {
        margin-bottom: 15px;
        padding-left: 20px;
    }
    
    .study-content li {
        margin-bottom: 6px;
        line-height: 1.5;
    }
}

/* Additional responsive styles for study guide */
@media (max-width: 1024px) {
    .study-guide-layout {
        gap: 15px;
    }
    
    .study-guide-sidebar {
        width: 250px;
    }
    
    .container {
        max-width: 100%;
        padding: 15px;
    }
}