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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Study Tool</title>
<script src="https://cdn.jsdelivr.net/npm/marked/marked.min.js"></script>
<style>
/* ============================================
CSS VARIABLES - LIGHT THEME
============================================ */
:root {
--bg-primary: #f5f5f0;
--bg-secondary: #ffffff;
--text-primary: #333;
--text-secondary: #666;
--border-color: #d0d0d0;
--header-bg-start: #4a6fa5;
--header-bg-end: #3a5f95;
--panel-shadow: rgba(0,0,0,0.08);
--input-bg: #ffffff;
--hover-bg: #f0f0eb;
--correct-bg: #e8f5e9;
--correct-border: #28a745;
--incorrect-bg: #fce4ec;
--incorrect-border: #dc3545;
--info-bg: #e8f0fe;
--info-border: #a8c4e6;
}
/* ============================================
CSS VARIABLES - DARK THEME
============================================ */
body.dark-mode {
--bg-primary: #1a1a1a;
--bg-secondary: #2d2d2d;
--text-primary: #e0e0e0;
--text-secondary: #b0b0b0;
--border-color: #444;
--header-bg-start: #3a5f85;
--header-bg-end: #2a4f75;
--panel-shadow: rgba(0,0,0,0.3);
--input-bg: #3a3a3a;
--hover-bg: #353535;
--correct-bg: #1a3a1a;
--correct-border: #28a745;
--incorrect-bg: #3a1a1a;
--incorrect-border: #dc3545;
--info-bg: #1a2a3d;
--info-border: #2a4a6a;
}
/* ============================================
GLOBAL RESET & BASE
============================================ */
* {
margin: 0;
padding: 0;
box-sizing: border-box;
}
body {
font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
background: var(--bg-primary);
color: var(--text-primary);
min-height: 100vh;
transition: background 0.3s, color 0.3s;
}
/* ============================================
HEADER
============================================ */
.header {
background: linear-gradient(135deg, var(--header-bg-start), var(--header-bg-end));
color: white;
padding: 1.25rem 2rem;
display: flex;
justify-content: space-between;
align-items: center;
box-shadow: 0 2px 8px rgba(0,0,0,0.15);
position: sticky;
top: 0;
z-index: 100;
}
.header h1 {
font-size: 1.4rem;
font-weight: 700;
letter-spacing: -0.5px;
}
.header-controls {
display: flex;
align-items: center;
gap: 1rem;
}
/* Sync button */
.sync-btn {
background: none;
border: 1.5px solid rgba(255,255,255,0.3);
border-radius: 8px;
color: rgba(255,255,255,0.7);
cursor: pointer;
font-size: 1.1rem;
padding: 0.25rem 0.5rem;
transition: all 0.2s;
line-height: 1;
}
.sync-btn:hover { border-color: rgba(255,255,255,0.6); color: #fff; }
.sync-btn.connected { color: #81c784; border-color: rgba(129,199,132,0.5); }
/* Theme toggle */
.theme-toggle {
display: flex;
align-items: center;
gap: 0.5rem;
cursor: pointer;
font-size: 0.85rem;
color: rgba(255,255,255,0.9);
}
.toggle-switch {
position: relative;
width: 44px;
height: 24px;
}
.toggle-switch input {
opacity: 0;
width: 0;
height: 0;
}
.toggle-slider {
position: absolute;
top: 0; left: 0; right: 0; bottom: 0;
background: rgba(255,255,255,0.3);
border-radius: 12px;
cursor: pointer;
transition: background 0.3s;
}
.toggle-slider::before {
content: '';
position: absolute;
width: 18px;
height: 18px;
left: 3px;
bottom: 3px;
background: white;
border-radius: 50%;
transition: transform 0.3s;
}
.toggle-switch input:checked + .toggle-slider {
background: rgba(0,0,0,0.3);
}
.toggle-switch input:checked + .toggle-slider::before {
transform: translateX(20px);
}
/* ============================================
TAB NAVIGATION
============================================ */
.tab-navigation {
background: var(--bg-secondary);
border-bottom: 2px solid var(--border-color);
box-shadow: 0 1px 4px var(--panel-shadow);
position: sticky;
top: var(--header-height, 58px);
z-index: 99;
}
.tab-buttons {
display: flex;
max-width: 900px;
margin: 0 auto;
padding: 0 1rem;
}
.tab-btn {
background: none;
border: none;
padding: 0.9rem 1.5rem;
font-size: 0.9rem;
font-weight: 600;
color: var(--text-secondary);
cursor: pointer;
border-bottom: 3px solid transparent;
transition: all 0.2s;
white-space: nowrap;
}
.tab-btn:hover {
color: var(--text-primary);
background: var(--hover-bg);
}
.tab-btn.active {
color: var(--header-bg-start);
border-bottom-color: var(--header-bg-start);
}
.tab-content {
display: none;
max-width: 900px;
margin: 0 auto;
padding: 1.5rem;
}
.tab-content.active {
display: block;
}
/* ============================================
PANELS & CARDS
============================================ */
.panel {
background: var(--bg-secondary);
border: 1px solid var(--border-color);
border-radius: 10px;
padding: 1.5rem;
margin-bottom: 1.5rem;
box-shadow: 0 2px 8px var(--panel-shadow);
}
.panel-title {
font-size: 1.1rem;
font-weight: 700;
margin-bottom: 1rem;
color: var(--text-primary);
}
/* ============================================
BUTTONS
============================================ */
.btn-primary {
background: linear-gradient(135deg, var(--header-bg-start), var(--header-bg-end));
color: white;
border: none;
padding: 0.75rem 1.5rem;
border-radius: 8px;
font-size: 0.95rem;
font-weight: 600;
cursor: pointer;
transition: opacity 0.2s, transform 0.1s;
}
.btn-primary:hover {
opacity: 0.9;
}
.btn-primary:active {
transform: scale(0.98);
}
.btn-primary:disabled {
opacity: 0.5;
cursor: not-allowed;
}
.btn-secondary {
background: var(--bg-secondary);
color: var(--text-primary);
border: 2px solid var(--border-color);
padding: 0.6rem 1.2rem;
border-radius: 8px;
font-size: 0.9rem;
font-weight: 600;
cursor: pointer;
transition: all 0.2s;
}
.btn-secondary:hover {
border-color: var(--header-bg-start);
color: var(--header-bg-start);
}
.btn-danger {
background: #dc3545;
color: white;
border: none;
padding: 0.6rem 1.2rem;
border-radius: 8px;
font-size: 0.9rem;
font-weight: 600;
cursor: pointer;
transition: opacity 0.2s;
}
.btn-danger:hover {
opacity: 0.9;
}
/* ============================================
FORM ELEMENTS
============================================ */
textarea, input[type="text"], select {
width: 100%;
padding: 0.75rem;
border: 2px solid var(--border-color);
border-radius: 8px;
font-size: 0.95rem;
font-family: inherit;
background: var(--input-bg);
color: var(--text-primary);
transition: border-color 0.2s;
}
textarea:focus, input[type="text"]:focus, select:focus {
outline: none;
border-color: var(--header-bg-start);
}
textarea {
resize: vertical;
min-height: 150px;
}
label {
display: block;
font-weight: 600;
margin-bottom: 0.4rem;
font-size: 0.9rem;
color: var(--text-primary);
}
/* ============================================
IMPORT TAB SPECIFICS
============================================ */
.import-methods {
display: flex;
gap: 0.5rem;
margin-bottom: 1.5rem;
border-bottom: 2px solid var(--border-color);
padding-bottom: 0.5rem;
}
.method-btn {
background: none;
border: none;
padding: 0.5rem 1rem;
cursor: pointer;
font-size: 0.9rem;
font-weight: 600;
color: var(--text-secondary);
border-bottom: 3px solid transparent;
transition: all 0.2s;
}
.method-btn.active {
color: var(--header-bg-start);
border-bottom-color: var(--header-bg-start);
}
.method-btn:hover {
color: var(--text-primary);
}
.import-method {
display: none;
}
.import-method.active {
display: block;
}
/* PDF drop zone */
.drop-zone {
border: 3px dashed var(--border-color);
border-radius: 10px;
padding: 3rem 2rem;
text-align: center;
cursor: pointer;
transition: all 0.3s;
color: var(--text-secondary);
}
.drop-zone:hover, .drop-zone.drag-over {
border-color: var(--header-bg-start);
background: var(--hover-bg);
}
.drop-zone-icon {
font-size: 2.5rem;
margin-bottom: 0.75rem;
}
.drop-zone-text {
font-size: 1rem;
font-weight: 600;
}
.drop-zone-hint {
font-size: 0.85rem;
margin-top: 0.25rem;
}
/* ============================================
FLASHCARD LIST (Quizlet-style for Home tab)
============================================ */
.flashcard-item {
display: flex;
border: 1px solid var(--border-color);
border-radius: 8px;
margin-bottom: 0.75rem;
background: var(--bg-secondary);
overflow: hidden;
transition: box-shadow 0.2s;
}
.flashcard-item:hover {
box-shadow: 0 2px 8px var(--panel-shadow);
}
.flashcard-left {
flex: 2;
padding: 1rem;
border-right: 1px solid var(--border-color);
}
.flashcard-q-num {
font-size: 0.75rem;
color: var(--text-secondary);
font-weight: 600;
margin-bottom: 0.4rem;
text-transform: uppercase;
letter-spacing: 0.5px;
}
.flashcard-q-text {
font-size: 0.9rem;
line-height: 1.5;
margin-bottom: 0.5rem;
color: var(--text-primary);
}
.flashcard-options-list {
display: flex;
flex-direction: column;
gap: 0.2rem;
font-size: 0.8rem;
color: var(--text-secondary);
}
.flashcard-right {
flex: 1;
padding: 1rem;
display: flex;
align-items: center;
justify-content: center;
text-align: center;
font-weight: 600;
font-size: 0.95rem;
color: var(--header-bg-start);
background: var(--hover-bg);
}
body.dark-mode .flashcard-right {
/* Make answer text more readable in dark mode */
color: var(--text-primary);
}
/* ============================================
QUESTION SET MANAGEMENT
============================================ */
.set-selector {
display: flex;
gap: 0.5rem;
flex-wrap: wrap;
margin-bottom: 1.5rem;
}
.set-chip {
padding: 0.5rem 1rem;
border: 2px solid var(--border-color);
border-radius: 20px;
cursor: pointer;
font-size: 0.85rem;
font-weight: 600;
background: var(--bg-secondary);
transition: all 0.2s;
}
.set-chip.active {
border-color: var(--header-bg-start);
background: var(--header-bg-start);
color: white;
}
.set-chip:hover:not(.active) {
border-color: var(--header-bg-start);
}
.set-chip .delete-set {
margin-left: 0.5rem;
opacity: 0.6;
cursor: pointer;
}
.set-chip .delete-set:hover {
opacity: 1;
}
/* ============================================
STUDY TAB
============================================ */
.study-modes {
display: flex;
gap: 0.5rem;
margin-bottom: 1.5rem;
border-bottom: 2px solid var(--border-color);
padding-bottom: 0.5rem;
position: sticky;
top: var(--nav-offset, 108px);
z-index: 48;
background: var(--bg-primary);
padding-top: 0.5rem;
}
.mode-btn {
background: none;
border: none;
padding: 0.5rem 1rem;
cursor: pointer;
font-size: 0.9rem;
font-weight: 600;
color: var(--text-secondary);
border-bottom: 3px solid transparent;
transition: all 0.2s;
}
.mode-btn.active {
color: var(--header-bg-start);
border-bottom-color: var(--header-bg-start);
}
.mode-btn:hover {
color: var(--text-primary);
}
/* Study options toolbar */
.study-options-bar {
display: none;
align-items: center;
gap: 0.4rem;
margin-bottom: 1rem;
padding: 0.5rem 0.75rem;
background: var(--hover-bg);
border-radius: 8px;
border: 1px solid var(--border-color);
flex-wrap: wrap;
}
.study-option-btn {
background: none;
border: 1.5px solid var(--border-color);
padding: 0.3rem 0.75rem;
border-radius: 20px;
cursor: pointer;
font-size: 0.78rem;
font-weight: 600;
color: var(--text-secondary);
transition: all 0.2s;
}
.study-option-btn:hover {
border-color: var(--header-bg-start);
color: var(--text-primary);
}
.study-option-btn.active {
background: var(--header-bg-start);
color: #fff;
border-color: var(--header-bg-start);
}
.study-options-divider {
width: 1px;
height: 1.2rem;
background: var(--border-color);
margin: 0 0.25rem;
}
/* Question card */
.question-card {
background: var(--bg-secondary);
border: 2px solid var(--border-color);
border-radius: 10px;
padding: 1.5rem;
margin-bottom: 1.5rem;
box-shadow: 0 2px 8px var(--panel-shadow);
transition: border-color 0.3s, background 0.3s;
}
.question-card.correct {
border-color: var(--correct-border);
background: var(--correct-bg);
}
.question-card.incorrect {
border-color: var(--incorrect-border);
background: var(--incorrect-bg);
}
.question-number {
font-size: 0.85rem;
color: var(--text-secondary);
margin-bottom: 0.5rem;
font-weight: 600;
display: flex;
align-items: center;
gap: 0.5rem;
}
.question-text {
font-size: 1.05rem;
line-height: 1.6;
margin-bottom: 1.25rem;
color: var(--text-primary);
}
/* MC options */
.mc-options {
display: flex;
flex-direction: column;
gap: 0.5rem;
}
.mc-option {
display: flex;
align-items: center;
gap: 0.75rem;
padding: 0.75rem 1rem;
border: 2px solid var(--border-color);
border-radius: 8px;
cursor: pointer;
transition: all 0.2s;
background: var(--bg-secondary);
}
.mc-option:hover:not(.disabled) {
border-color: var(--header-bg-start);
background: var(--hover-bg);
}
.mc-option.selected {
border-color: var(--header-bg-start);
background: var(--hover-bg);
font-weight: 600;
}
.mc-option.correct-answer {
border-color: var(--correct-border);
background: var(--correct-bg);
}
.mc-option.wrong-answer {
border-color: var(--incorrect-border);
background: var(--incorrect-bg);
}
.mc-option.disabled {
cursor: default;
opacity: 0.85;
}
.option-letter {
width: 32px;
height: 32px;
border-radius: 50%;
display: flex;
align-items: center;
justify-content: center;
font-weight: 700;
font-size: 0.9rem;
background: var(--hover-bg);
border: 2px solid var(--border-color);
flex-shrink: 0;
transition: all 0.2s;
}
.mc-option.selected .option-letter {
background: var(--header-bg-start);
color: white;
border-color: var(--header-bg-start);
}
.mc-option.correct-answer .option-letter {
background: var(--correct-border);
color: white;
border-color: var(--correct-border);
}
.mc-option.wrong-answer .option-letter {
background: var(--incorrect-border);
color: white;
border-color: var(--incorrect-border);
}
.option-text {
flex: 1;
font-size: 0.95rem;
}
/* Short answer input */
.short-answer-area {
display: flex;
flex-direction: column;
gap: 0.75rem;
}
.short-answer-input {
width: 100%;
padding: 0.75rem 1rem;
border: 2px solid var(--border-color);
border-radius: 8px;
font-size: 1rem;
font-family: inherit;
background: var(--input-bg);
color: var(--text-primary);
transition: border-color 0.2s;
}
.short-answer-input:focus {
outline: none;
border-color: var(--header-bg-start);
}
.short-answer-input:disabled {
opacity: 0.85;
cursor: default;
}
.short-answer-input.correct {
border-color: var(--correct-border);
background: var(--correct-bg);
}
.short-answer-input.incorrect {
border-color: var(--incorrect-border);
background: var(--incorrect-bg);
}
.short-answer-hint {
font-size: 0.8rem;
color: var(--text-secondary);
font-style: italic;
}
/* Session progress bar */
.session-progress {
background: var(--bg-secondary);
border: 1px solid var(--border-color);
border-radius: 10px;
padding: 1rem 1.5rem;
margin-bottom: 1.5rem;
display: none;
}
.session-progress-header {
display: flex;
justify-content: space-between;
align-items: center;
margin-bottom: 0.5rem;
font-size: 0.9rem;
font-weight: 600;
}
.progress-bar-container {
width: 100%;
height: 8px;
background: var(--border-color);
border-radius: 4px;
overflow: hidden;
}
.progress-bar-fill {
height: 100%;
border-radius: 4px;
transition: width 0.5s ease;
background: linear-gradient(to right, var(--header-bg-start), var(--header-bg-end));
}
/* Study navigation */
.study-nav {
display: none;
justify-content: center;
gap: 1rem;
margin-top: 1rem;
/* Make the navigation sticky to the bottom of the viewport on scroll */
position: sticky;
bottom: 0;
/* Add a background and padding to create a solid footer bar */
background: var(--bg-secondary);
padding: 1rem 0;
border-top: 1px solid var(--border-color);
}
/* Submit answer button */
.submit-answer-area {
text-align: center;
margin-top: 1rem;
position: sticky;
bottom: 0;
background: var(--bg-secondary);
padding: 1rem 0;
border-top: 1px solid var(--border-color);
z-index: 10;
}
/* Feedback */
.feedback {
margin-top: 1rem;
padding: 0.75rem 1rem;
border-radius: 8px;
font-weight: 600;
font-size: 0.95rem;
}
.feedback.correct {
background: var(--correct-bg);
color: var(--correct-border);
border: 1px solid var(--correct-border);
}
.feedback.incorrect {
background: var(--incorrect-bg);
color: var(--incorrect-border);
border: 1px solid var(--incorrect-border);
}
.feedback .explanation {
font-weight: 400;
font-size: 0.85rem;
margin-top: 0.4rem;
color: var(--text-secondary);
}
/* Star button */
.star-btn {
background: none;
border: none;
font-size: 1.3rem;
cursor: pointer;
padding: 0.25rem;
opacity: 0.35;
transition: opacity 0.2s, transform 0.2s;
color: var(--text-primary);
}
.star-btn.starred {
opacity: 1;
color: #f9a825;
}
.star-btn:hover {
transform: scale(1.15);
opacity: 0.7;
}
/* ============================================
FLASHCARD STUDY MODE (Quizlet-style)
============================================ */
.fc-wrapper {
perspective: 1000px;
}
.fc-card {
background: linear-gradient(145deg, #2a4a5a, #1a3a4a);
border-radius: 16px;
min-height: 420px;
cursor: pointer;
position: relative;
display: flex;
flex-direction: column;
overflow: hidden;
box-shadow: 0 4px 20px rgba(0,0,0,0.25);
transition: box-shadow 0.3s;
}
body.dark-mode .fc-card {
background: linear-gradient(145deg, #1e3a4a, #152e3e);
}
.fc-card:hover {
box-shadow: 0 6px 28px rgba(0,0,0,0.35);
}
.fc-card-header {
display: flex;
justify-content: space-between;
align-items: center;
padding: 1rem 1.25rem 0;
}
.fc-card-header .star-btn {
color: rgba(255,255,255,0.5);
font-size: 1.4rem;
}
.fc-card-header .star-btn.starred {
color: #f9a825;
opacity: 1;
}
.fc-card-header .mastery-new {
background: rgba(100, 181, 246, 0.25);
color: #90caf9;
border: 1px solid rgba(100, 181, 246, 0.4);
}
.fc-card-header .mastery-learning {
background: rgba(239, 83, 80, 0.25);
color: #ef9a9a;
border: 1px solid rgba(239, 83, 80, 0.45);
}
.fc-card-header .mastery-familiar {
background: rgba(255, 179, 0, 0.25);
color: #ffe082;
border: 1px solid rgba(255, 179, 0, 0.45);
}
.fc-card-header .mastery-mastered {
background: rgba(76, 175, 80, 0.25);
color: #a5d6a7;
border: 1px solid rgba(76, 175, 80, 0.45);
}
.fc-card-body {
flex: 1;
display: flex;
flex-direction: column;
justify-content: center;
padding: 2rem 2.5rem;
color: #e8f0e0;
}
.fc-question-text {
font-size: 1.25rem;
line-height: 1.7;
font-weight: 500;
margin-bottom: 1.5rem;
}
.fc-options-list {
display: flex;
flex-direction: column;
gap: 0.6rem;
}
.fc-option-item {
font-size: 1.05rem;
line-height: 1.5;
color: rgba(232,240,224,0.85);
display: flex;
align-items: baseline;
gap: 0.25rem;
}
.fc-option-item::before {
content: '\2022';
margin-right: 0.4rem;
font-size: 1.2rem;
}
/* Answer side (back of card) */
.fc-answer-body {
flex: 1;
display: flex;
flex-direction: column;
justify-content: center;
align-items: center;
padding: 2rem 2.5rem;
color: #e8f0e0;
text-align: center;
}
.fc-answer-text {
font-size: 1.6rem;
font-weight: 700;
color: #ffffff;
line-height: 1.5;
}
.fc-explanation {
font-size: 1rem;
color: rgba(232,240,224,0.7);
margin-top: 1rem;
line-height: 1.6;
}
.fc-flip-bar {
background: linear-gradient(135deg, var(--header-bg-start), var(--header-bg-end));
color: white;
text-align: center;
padding: 0.6rem;
font-size: 0.85rem;
font-weight: 600;
letter-spacing: 0.3px;