:root {
    --primary-color: #007bff;
    --secondary-color: #6c757d;
    --light-color: #f8f9fa;
    --dark-color: #343a40;
    --danger-color: #dc3545; /* Merah Padam */
    --white-color: #ffffff;
    --success-color: #28a745; 
    --toolbar-label-color: #B22222; 
    --drawing-ink-color: #000000; 
    --answer-option-bg: #fefefe; 
    
    --pastel-orange: #ffcc80; /* Oranye untuk label toolbar di dark mode */
    --answered-blue: #90caf9;
    --selected-option-pastel-blue: #bbdefb;

    --border-color: #dee2e6;
    --sidebar-width: 280px;
    --navbar-height: 60px;
    --bottom-nav-height: 70px;
    --mobile-drawer-toggle-height: 30px; 

    --z-index-navbar: 1000;
    --z-index-footer: 999;
    --z-index-mobile-drawer: 1001; 
    --z-index-settings-menu: 1002; 
    --z-index-sticky-toolbar: 998; 
    --z-index-drawing-canvas: 5; 

    /* Dark Mode Variables */
    --dm-bg: #121212;
    --dm-surface: #1e1e1e; 
    --dm-question-area-bg: #272727; 
    --dm-text: #e0e0e0;
    --dm-text-secondary: #adb5bd;
    --dm-border: #444444;
    --dm-primary-accent: #4dabf7; 
    --dm-secondary-accent: #868e96;
    --dm-answer-option-bg: #2c2c2c;
    --dm-selected-option-bg: #0056b3; 
    --dm-navbar-bg: var(--danger-color); 
    --dm-toolbar-label-color: var(--pastel-orange);
}

body {
    margin: 0;
    font-family: 'Inter', Arial, sans-serif;
    background-color: var(--light-color);
    color: var(--dark-color);
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    padding-top: var(--navbar-height);
    padding-bottom: var(--bottom-nav-height);
    box-sizing: border-box;
    transition: background-color 0.3s, color 0.3s;
}
body.no-scroll { 
    overflow: hidden;
}

/* Dark Mode Styles */
body.dark-mode {
    background-color: var(--dm-bg);
    color: var(--dm-text);
}
body.dark-mode .navbar {
    background-color: var(--dm-navbar-bg); 
    border-bottom: 1px solid var(--dm-border);
}
body.dark-mode .brand-title, body.dark-mode .brand-title-desktop {
    color: var(--white-color);
}
body.dark-mode .burger-menu, body.dark-mode .settings-button {
    color: var(--white-color);
}
body.dark-mode .settings-menu {
    background-color: var(--dm-surface);
    border-color: var(--dm-border);
}
body.dark-mode .settings-group {
    border-bottom-color: var(--dm-border);
}
body.dark-mode .settings-group-title {
    color: var(--dm-text-secondary);
}
body.dark-mode .settings-menu-item {
    color: var(--dm-text);
}
body.dark-mode .settings-menu-item:hover {
    background-color: #3a3a3a;
}
body.dark-mode .settings-menu-item .menu-icon {
    color: var(--dm-text-secondary);
}
body.dark-mode .settings-menu-item .menu-icon.active {
    color: var(--success-color);
}
body.dark-mode .pen-size-btn {
    background-color: #3a3a3a;
    border-color: var(--dm-border);
    color: var(--dm-text);
}
body.dark-mode #currentPenSize {
    color: var(--dm-text);
}
body.dark-mode .sidebar {
    background-color: var(--dm-surface);
    border-right-color: var(--dm-border);
}
body.dark-mode .sidebar-header {
    border-bottom-color: var(--dm-border);
    color: var(--dm-text);
}
body.dark-mode .nav-grid-item {
    background-color: #3a3a3a;
    border-color: var(--dm-border);
    color: var(--dm-text);
}
body.dark-mode .nav-grid-item.current {
    background-color: var(--pastel-orange); 
    color: var(--dark-color); 
    border-color: #e69500;
}
body.dark-mode .nav-grid-item.answered {
    background-color: var(--dm-primary-accent);
    border-color: #3691d6;
    color: var(--white-color);
}
body.dark-mode .nav-grid-item.flagged .flag-icon {
    background-color: var(--dm-surface); 
}
body.dark-mode .question-area {
    background-color: var(--dm-question-area-bg); 
}
body.dark-mode .question-toolbar {
    background-color: var(--dm-question-area-bg); 
    border-bottom-color: var(--dm-border);
}
body.dark-mode .toolbar-label {
    color: var(--dm-toolbar-label-color); 
}
body.dark-mode .toolbar-icon {
    color: var(--dm-text-secondary);
}
body.dark-mode .toolbar-icon:hover, body.dark-mode .toolbar-icon.active {
    color: var(--dm-primary-accent);
}
body.dark-mode #questionNumber, body.dark-mode #questionText {
    color: var(--dm-text);
}
body.dark-mode .answer-options .option {
    background-color: var(--dm-answer-option-bg);
    border-color: var(--dm-border);
    color: var(--dm-text);
}
body.dark-mode .answer-options .option.selected {
    background-color: var(--dm-selected-option-bg);
    border-color: #004085;
    color: var(--white-color);
}
body.dark-mode .bottom-navigation {
    background-color: #212529; 
    border-top-color: var(--dm-border);
}
body.dark-mode #prevButton, body.dark-mode #nextButton {
    background-color: var(--dm-primary-accent);
}
body.dark-mode #markButton {
    background-color: var(--dm-secondary-accent);
}
body.dark-mode #markButton.marked {
    background-color: var(--danger-color);
}

body.dark-mode .mobile-nav-toggle {
    color: var(--dm-primary-accent);
}
body.dark-mode .mobile-nav-sheet {
    background-color: var(--dm-surface);
    border-color: var(--dm-border);
    box-shadow: 0 -3px 10px rgba(0,0,0,0.25);
}

.answer-input, .essay-input {
    width: 100%;
    padding: 12px;
    font-size: 1em;
    font-family: 'Inter', sans-serif;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    box-sizing: border-box;
}
.essay-input {
    min-height: 150px;
    resize: vertical;
}
body.dark-mode .answer-input, body.dark-mode .essay-input {
    background-color: var(--dm-answer-option-bg);
    border-color: var(--dm-border);
    color: var(--dm-text);
}

/* ================================== */
/* PERUBAHAN CSS: Tambahan styling untuk tombol submit */
.submit-button {
    background-color: var(--success-color) !important;
}
.submit-button:hover {
    background-color: #218838 !important;
}
/* ================================== */

.navbar {
    background-color: var(--primary-color);
    color: var(--white-color);
    padding: 0 20px;
    height: var(--navbar-height);
    display: flex;
    justify-content: space-between;
    align-items: center;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: var(--z-index-navbar);
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.navbar-left {
    display: flex;
    align-items: center;
}
.navbar-right {
    display: flex;
    align-items: center;
    position: relative; 
}
.navbar-center {
    flex-grow: 1;
    text-align: center;
    display: none; 
}

.brand-title {
    font-size: 1.3em; 
    font-weight: 700; 
    text-transform: uppercase; 
    letter-spacing: 0.5px; 
    font-family: 'Arial Black', Gadget, sans-serif; 
}
.brand-title-desktop {
    font-size: 1.3em; 
    font-weight: 700; 
    text-transform: uppercase;
    letter-spacing: 0.5px;
    font-family: 'Arial Black', Gadget, sans-serif;
}

.burger-menu, .settings-button {
    background: none;
    border: none;
    color: var(--white-color);
    cursor: pointer;
    padding: 8px; 
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
}
.burger-menu {
    margin-right: 10px;
    font-size: 1.2em;
}
.settings-button {
    font-size: 1em; 
}
.settings-button svg, .burger-menu svg {
    width: 20px; 
    height: 20px;
}
.burger-menu svg {
    width: 22px;
    height: 22px;
}

.settings-menu {
    display: none;
    position: absolute;
    top: calc(100% + 5px); 
    right: 0;
    background-color: var(--white-color);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    box-shadow: 0 3px 12px rgba(0,0,0,0.15);
    z-index: var(--z-index-settings-menu);
    min-width: 230px; 
    padding: 0; 
}
.settings-menu.open {
    display: block;
}
.settings-group {
    padding: 8px 0;
    border-bottom: 1px solid var(--border-color);
}
.settings-group:last-child {
    border-bottom: none;
}
.settings-group-title {
    padding: 8px 15px;
    font-size: 0.8em;
    font-weight: 600;
    color: var(--secondary-color);
    text-transform: uppercase;
}
.settings-menu-item {
    display: flex; 
    align-items: center;
    padding: 10px 15px; 
    text-decoration: none;
    color: var(--dark-color);
    font-size: 0.9em;
    white-space: nowrap; 
}
.settings-menu-item:hover {
    background-color: var(--light-color);
}
.settings-menu-item .menu-icon { 
    margin-right: 10px; 
    width: 18px; 
    text-align: center;
    color: var(--secondary-color); 
}
.settings-menu-item .menu-icon.active {
    color: var(--success-color); 
}
.settings-menu-item label {
    margin-right: 8px;
    flex-shrink: 0;
}
.pen-size-control {
    display: flex;
    align-items: center;
    margin-left: auto; 
}
.pen-size-btn {
    background-color: var(--light-color);
    border: 1px solid var(--border-color);
    color: var(--dark-color);
    width: 28px;
    height: 28px;
    font-size: 1em;
    border-radius: 4px;
    cursor: pointer;
    margin: 0 3px;
}
#currentPenSize {
    min-width: 20px;
    text-align: center;
    font-weight: 500;
}

.pen-color-options {
    display: flex;
    justify-content: space-around;
    padding: 5px 0;
    margin-left: auto; 
}
.pen-color-btn {
    width: 24px;
    height: 24px;
    border-radius: 50%;
    border: 1px solid var(--border-color);
    cursor: pointer;
    margin: 0 3px;
}
.pen-color-btn.active {
    border-width: 2px;
    border-color: var(--primary-color);
    transform: scale(1.1);
}

.main-container {
    display: flex;
    flex-grow: 1;
    transition: margin-left 0.3s ease-in-out;
    height: calc(100vh - var(--navbar-height) - var(--bottom-nav-height));
}

.sidebar {
    width: 0;
    background-color: #f0f0f0;
    padding-top: 15px;
    overflow-x: hidden;
    transition: width 0.3s ease-in-out;
    border-right: 1px solid var(--border-color);
    flex-shrink: 0;
    height: 100%;
    overflow-y: auto;
    border-radius: 0 8px 8px 0;
}

.sidebar.open {
    width: var(--sidebar-width);
}

.sidebar-header {
    padding: 10px 15px;
    font-size: 1.1em;
    font-weight: bold;
    text-align: center;
    border-bottom: 1px solid var(--border-color);
    margin-bottom: 10px;
}

.question-navigation-grid {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 8px;
    padding: 0 15px 15px 15px;
}

.nav-grid-item {
    background-color: var(--white-color);
    border: 1px solid var(--border-color);
    padding: 10px 0;
    text-align: center;
    cursor: pointer;
    border-radius: 6px;
    font-size: 0.9em;
    position: relative;
    transition: background-color 0.2s, color 0.2s, transform 0.1s, border-color 0.2s;
}
.nav-grid-item:hover {
    background-color: #e9ecef;
    transform: translateY(-2px);
}
.nav-grid-item.current {
    background-color: var(--pastel-orange);
    color: var(--dark-color);
    font-weight: bold;
    border-color: #ffb74d;
}
.nav-grid-item.answered {
    background-color: var(--answered-blue);
    color: var(--dark-color);
    border-color: #64b5f6;
}
.nav-grid-item.flagged .flag-icon {
    position: absolute;
    top: -8px;
    right: -8px;
    font-size: 0.9em;
    color: var(--danger-color);
    background-color: var(--white-color);
    border-radius: 50%;
    padding: 2px;
    box-shadow: 0 1px 2px rgba(0,0,0,0.2);
    width: 20px;
    height: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.question-area {
    flex-grow: 1;
    background-color: var(--white-color); 
    overflow-y: auto; 
    height: 100%;
    position: relative; 
}

.question-toolbar {
    display: flex;
    justify-content: space-between; 
    align-items: center;
    padding: 10px 25px; 
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0; 
    background-color: var(--white-color); 
    z-index: var(--z-index-sticky-toolbar);
}

.toolbar-label {
    font-size: 1em; 
    font-weight: 700; 
    color: var(--toolbar-label-color); 
    margin-right: auto; 
}
.toolbar-icons-group {
    display: flex;
    align-items: center;
}
.toolbar-icon {
    color: var(--secondary-color);
    font-size: 1.15em; 
    margin: 0 7px; 
    cursor: pointer;
    transition: color 0.2s;
}
.toolbar-icon:hover {
    color: var(--primary-color);
}
.toolbar-icon.active { 
    color: var(--primary-color);
}

.question-content-wrapper { 
    position: relative;
}

.question-content {
    padding: 25px;
}

.drawing-canvas {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: var(--z-index-drawing-canvas);
    display: none;
    cursor: crosshair;
    touch-action: none; 
}
.drawing-canvas.active {
    display: block;
}


#questionNumber {
    font-size: 1.4em;
    font-weight: bold;
    color: var(--dark-color);
    margin-bottom: 20px;
}

#questionText {
    font-size: 1.15em; 
    line-height: 1.7; 
    margin-bottom: 30px;
    color: #333;
}
#questionText mjx-container, .answer-options .option mjx-container {
    font-size: 1.05em !important;
    margin: 0 0.15em;
    font-family: 'Inter', Arial, sans-serif; 
}

.answer-options .option {
    display: flex; 
    align-items: center;
    width: 100%; 
    box-sizing: border-box; 
    padding: 15px 12px;
    margin-bottom: 12px;
    background-color: var(--answer-option-bg); 
    border: 1px solid var(--border-color);
    border-radius: 8px;
    cursor: pointer;
    transition: background-color 0.2s, border-color 0.2s, transform 0.1s;
    text-align: left;
    font-size: 1.1em; 
}
.option-prefix {
    font-weight: bold;
    margin-right: 10px;
    min-width: 20px; 
    font-family: 'Inter', Arial, sans-serif; 
}
.option-text {
    flex-grow: 1;
}

.answer-options .option:hover {
    background-color: #e2e6ea;
    border-color: #dae0e5;
    transform: translateY(-2px);
}

.answer-options .option.selected {
    background-color: var(--selected-option-pastel-blue);
    color: var(--dark-color);
    border-color: #81d4fa;
    font-weight: 500;
}

body.notes-mode-on .answer-options .option {
    cursor: crosshair; 
}

body.notes-mode-on .answer-options .option,
body.notes-mode-on .answer-options .option:hover,
body.notes-mode-on .answer-options .option.selected {
    border-color: transparent; 
    background-color: transparent;
    font-weight: normal;
}

body.notes-mode-on .answer-options .option:hover {
    transform: none;
    background-color: var(--answer-option-bg); 
}

body.dark-mode.notes-mode-on .answer-options .option,
body.dark-mode.notes-mode-on .answer-options .option:hover,
body.dark-mode.notes-mode-on .answer-options .option.selected {
    border-color: transparent;
    background-color: transparent;
    font-weight: normal;
}

.bottom-navigation { 
    background-color: var(--white-color);
    padding: 10px 15px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-top: 1px solid var(--border-color);
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    z-index: var(--z-index-footer);
    height: var(--bottom-nav-height);
    box-sizing: border-box;
    box-shadow: 0 -2px 5px rgba(0,0,0,0.05);
}

.nav-button {
    padding: 10px 15px; 
    border: none;
    border-radius: 50px;
    cursor: pointer;
    font-size: 0.9em; 
    font-weight: 500;
    flex-basis: 30%; 
    text-align: center;
    margin: 0 5px; 
    transition: background-color 0.2s, opacity 0.2s, transform 0.1s;
    display: flex;
    align-items: center;
    justify-content: center;
}
.nav-button i {
    margin-right: 6px; 
}
#prevButton i {
    margin-right: 4px; 
}


#prevButton, #nextButton {
    background-color: var(--primary-color);
    color: var(--white-color);
}
#prevButton:hover, #nextButton:hover {
    background-color: #0056b3;
    transform: translateY(-1px);
}
#markButton {
    background-color: var(--secondary-color);
    color: var(--white-color);
}
#markButton:hover {
    background-color: #545b62;
    transform: translateY(-1px);
}
#markButton.marked {
    background-color: var(--danger-color);
}
#markButton.marked:hover {
    background-color: #c82333;
}
.nav-button:disabled {
    background-color: #ccc;
    cursor: not-allowed;
    opacity: 0.6;
    transform: none;
}

/* Mobile Navigation Drawer (Sheet) */
.mobile-nav-container { 
    position: fixed;
    bottom: var(--bottom-nav-height); 
    left: 0;
    right: 0;
    z-index: var(--z-index-mobile-drawer); 
    display: none; 
}
.mobile-nav-toggle {
    background-color: transparent; 
    color: var(--primary-color); 
    border: none;
    width: 100%;
    height: var(--mobile-drawer-toggle-height); 
    text-align: center;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 5px 0; 
}
.mobile-nav-toggle .arrow-icon {
    display: inline-block;
    transition: transform 0.3s;
    font-size: 1.6em; 
    padding: 5px; 
}
.mobile-nav-sheet {
    background-color: var(--white-color);
    border: 1px solid var(--border-color);
    border-bottom: none; 
    border-radius: 10px 10px 0 0; 
    max-height: 0; 
    overflow: hidden; 
    transition: max-height 0.3s ease-in-out; 
    box-shadow: 0 -3px 10px rgba(0,0,0,0.15); 
}
.mobile-nav-container.open .mobile-nav-sheet {
    max-height: 180px; 
    overflow-y: auto; 
    overscroll-behavior-y: contain; 
    -webkit-overflow-scrolling: touch; 
}
.mobile-question-navigation-content {
    padding: 10px 0; 
}


@media (max-width: 768px) {
    .sidebar { display: none; }
    .main-container.sidebar-pushed .question-area { margin-left: 0; }
    .burger-menu { display: none; }
    .navbar-center { display: none; }
    .brand-title-desktop { display: none; }
    .navbar-left .brand-title { display: inline; }

    .mobile-nav-container { display: block; } 

    .answer-options .option { font-size: 0.95em; padding: 12px 10px; }
    #questionText { font-size: 1.15em; } 
    .nav-button { font-size: 0.85em; padding: 10px 8px; } 
    .nav-button i { margin-right: 4px; font-size: 0.9em; } 

    .question-area { padding: 0; } 
    .question-content-wrapper { padding: 0; }
    .question-content { padding: 20px; }
    .question-toolbar { padding: 10px 20px; } 
}
@media (min-width: 769px) {
    #brandTitle { display: none; }
    .navbar-center { display: flex; align-items: center; justify-content: center; }
}

code {
    background-color: #e7f5ff !important; /* Biru pastel */
    color: #0056b3 !important;
    padding: 3px 6px !important;
    border-radius: 6px !important;
    font-size:15px;
}

.check-answer-btn {
    margin-top: 20px;
    background-color: #28a745; /* Warna hijau */
    color: white;
}

.feedback-controls {
    display: flex;
    justify-content: center;
    align-items: center;
    flex-direction: column;
}

.feedback-container {
    margin-top: 15px;
    padding: 15px;
    border-radius: 8px;
    width: 100%;
    box-sizing: border-box;
}

.feedback-correct {
    border: 1px solid #28a745;
    background-color: #e9f7ea;
}

.feedback-incorrect {
    border: 1px solid #dc3545;
    background-color: #fcebeb;
}

.status-correct {
    color: #28a745;
    font-weight: bold;
}

.status-incorrect {
    color: #dc3545;
    font-weight: bold;
}

.results-container .results-title {
    text-align: center;
    font-size: 1.8em;
    margin-bottom: 30px;
}

.results-overview {
    display: flex;
    flex-direction: row;
    flex-wrap: wrap;
    align-items: center;
    justify-content: center;
    gap: 40px;
    margin-bottom: 40px;
}

.results-chart-container {
    position: relative;
    height: 180px;
    width: 180px;
    flex-shrink: 0;
}

.results-details-container {
    text-align: left;
}

.details-list {
    list-style-type: none;
    padding: 0;
    margin: 0;
    min-width: 240px; /* Lebar minimum agar tidak terlalu sempit */
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 10px 20px;
    background-color: var(--background-color-secondary);
}

.details-list li {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 10px 0;
    font-size: 1em;
}

.details-list li:not(:last-child) {
    border-bottom: 1px solid var(--border-color);
}

.details-list li.final-grade {
    font-size: 1.2em;
    font-weight: bold;
    color: var(--primary-color, #007BFF);
}

.details-list li.final-grade strong {
     color: var(--primary-color, #007BFF);
}

.details-list li span {
    color: var(--text-color-secondary);
    margin-right: 15px;
}

.details-list li strong {
    color: var(--text-color);
}

/* Breakdown section */
.results-breakdown {
    margin-top: 30px;
    border-top: 1px solid var(--border-color);
    padding-top: 20px;
    max-width: 400px;
    margin-left: auto;
    margin-right: auto;
}

.results-breakdown h3 {
    text-align: center;
    font-size: 1.2em;
    margin-bottom: 20px;
}

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

.result-list-item {
    display: flex;
    justify-content: flex-start;
    align-items: center;
    gap: 15px;
    padding: 10px 15px;
    margin-bottom: 8px;
    border-radius: 8px;
    background-color: var(--background-color-secondary);
    cursor: pointer;
    transition: background-color 0.2s ease;
}

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

.status-badge {
    padding: 4px 10px;
    border-radius: 12px;
    font-size: 0.85em;
    font-weight: bold;
    color: #fff;
}

.result-list-item.correct .status-badge {
    background-color: #28a745;
}

.result-list-item.incorrect .status-badge {
    background-color: #dc3545;
}

.result-list-item.unanswered .status-badge {
    background-color: #6c757d;
}