/* --- Google Font & Global Styles --- */
@import url('https://fonts.googleapis.com/css2?family=Hind+Siliguri:wght@400;500;700&display=swap');

:root {
    --primary-color: #4A90E2;
    --secondary-color: #50E3C2;
    --dark-color: #333A45;
    --light-color: #FFFFFF;
    --bg-color: #F4F7FC;
    --danger-color: #E74C3C;
    --border-radius: 12px;
    --box-shadow: 0 6px 20px rgba(0, 0, 0, 0.08);
    --transition: all 0.3s ease-in-out;
}

body {
    font-family: 'Hind Siliguri', sans-serif;
    background-color: var(--bg-color);
    color: var(--dark-color);
    margin: 0;
    line-height: 1.7;
}

/* --- Layout & Common --- */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem;
}

header {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: var(--light-color);
    text-align: center;
    padding: 3rem 1rem;
    border-bottom-left-radius: 20px;
    border-bottom-right-radius: 20px;
}

header h1 {
    margin: 0;
    font-size: 2.5rem;
    font-weight: 700;
}

header p {
    opacity: 0.9;
    font-size: 1.1rem;
}

footer {
    text-align: center;
    padding: 1.5rem;
    margin-top: 3rem;
    background-color: var(--dark-color);
    color: var(--light-color);
}

.btn {
    padding: 0.8rem 1.8rem;
    border: none;
    border-radius: var(--border-radius);
    background-color: var(--primary-color);
    color: var(--light-color);
    font-size: 1rem;
    font-family: 'Hind Siliguri', sans-serif;
    cursor: pointer;
    transition: var(--transition);
    font-weight: 500;
}

.btn:hover {
    background-color: #357ABD;
    transform: scale(1.05);
}

.btn:disabled {
    background-color: #B0C4DE;
    cursor: not-allowed;
    transform: none;
}

/* --- Main Menu (index.html) --- */
.main-menu {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 1.8rem;
    margin-top: 2rem;
}

.menu-item {
    background: var(--light-color);
    padding: 1.5rem 2rem;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    text-decoration: none;
    color: var(--dark-color);
    transition: var(--transition);
    display: flex;
    align-items: center;
    gap: 1.5rem;
}

.menu-item:hover {
    transform: translateY(-8px) scale(1.02);
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.1);
}

.menu-item .icon {
    font-size: 2.5rem;
    color: var(--primary-color);
}

.menu-item h2 {
    margin: 0 0 0.25rem 0;
    font-size: 1.3rem;
    font-weight: 700;
}

.menu-item p {
    margin: 0;
    font-size: 0.9rem;
    color: #666;
}

/* --- Book, MCQ & Creative Viewer --- */
.viewer-container {
    background: var(--light-color);
    padding: 2.5rem;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
}

.search-bar {
    display: flex;
    gap: 10px;
    margin-bottom: 1.5rem;
}

.search-bar input {
    width: 100%;
    padding: 0.8rem;
    border: 2px solid #ddd;
    border-radius: var(--border-radius);
    font-size: 1rem;
    transition: border-color 0.3s ease;
}

.search-bar input:focus {
    outline: none;
    border-color: var(--primary-color);
}

.image-viewer {
    margin: 2rem 0;
    text-align: center;
}

.image-viewer img {
    max-width: 100%;
    height: auto;
    border: 1px solid #eee;
    padding: 5px;
    border-radius: var(--border-radius);
    animation: fadeIn 0.8s ease;
}

.navigation {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: 1.5rem;
}

.navigation #pageIndicator {
    font-weight: bold;
    font-size: 1.2rem;
}

/* --- Board & Creative Question List --- */
.item-list {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1rem;
    margin-bottom: 2rem;
}

.item-btn {
    background-color: #EAF2F8;
    color: var(--dark-color);
    text-align: center;
}

.item-btn:hover {
    background-color: #D4E6F1;
}

/* --- AI Note Section --- */
.note-container {
    background: var(--light-color);
    padding: 2.5rem;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
}

.note {
    margin-bottom: 2rem;
    border-bottom: 1px solid #eee;
    padding-bottom: 1.5rem;
}

.note:last-child {
    border-bottom: none;
}

.note h2 {
    color: var(--primary-color);
}

.note p {
    white-space: pre-wrap;
}

/* --- Enhanced Quiz UI/UX Styles --- */

.quiz-box {
    position: relative;
    overflow: hidden;
    background: var(--light-color);
    padding: 2.5rem;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    max-width: 800px;
    margin: 2rem auto;
}

.progress-container {
    width: 100%;
    height: 10px;
    background-color: #e0e0e0;
    border-radius: 5px;
    margin-bottom: 0.5rem;
}

#progressBar {
    height: 100%;
    width: 0%;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
    border-radius: 5px;
    transition: width 0.4s ease-in-out;
}

.progress-text {
    text-align: center;
    margin-bottom: 2rem;
    font-weight: 500;
    color: #555;
}

#question {
    font-size: 1.4rem;
    font-weight: 700;
    min-height: 80px;
    animation: fadeIn 0.4s ease;
}

.options-container {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.option-btn {
    width: 100%;
    padding: 1rem;
    font-size: 1.1rem;
    text-align: left;
    border: 2px solid #ddd;
    background-color: var(--light-color);
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: border-color 0.3s, background-color 0.3s, transform 0.2s;
}

.option-btn:hover {
    border-color: var(--primary-color);
}

/* --- Styles for when an answer is selected --- */

.quiz-view.answered .option-btn {
    cursor: not-allowed; /* Change cursor to show it's disabled */
}

.option-btn.correct {
    background-color: var(--secondary-color) !important;
    border-color: #1a9c80 !important;
    color: var(--dark-color) !important;
}

.option-btn.incorrect {
    background-color: var(--danger-color) !important;
    border-color: #c0392b !important;
    color: white !important;
}

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

@keyframes shake {
  0%, 100% { transform: translateX(0); }
  25% { transform: translateX(-8px); }
  75% { transform: translateX(8px); }
}

@keyframes pulse {
  0% { transform: scale(1); }
  50% { transform: scale(1.04); }
  100% { transform: scale(1); }
}

.shake {
    animation: shake 0.4s ease-in-out;
}

.pulse {
    animation: pulse 0.6s ease;
}


/* Score Card Styles */
#score-card {
    text-align: center;
    animation: fadeIn 0.8s ease;
}

#score-card h2 {
    font-size: 2.5rem;
    color: var(--primary-color);
}

.score-message {
    font-size: 1.2rem;
    color: #333;
    margin: 1rem 0;
}


/* --- Responsive Design --- */
@media (max-width: 768px) {
    header h1 { font-size: 2rem; }
    .container { padding: 1rem; }
    .viewer-container, .note-container, .quiz-box { padding: 1.5rem; }
    .main-menu { grid-template-columns: 1fr; }
    .navigation { flex-direction: column; gap: 1rem; }
}
body {
    font-family: Arial, sans-serif;
    line-height: 1.6;
    margin: 0;
    padding: 0;
    background-color: #f4f4f4;
}

header {
    background-color: #333;
    color: #fff;
    padding: 1rem 0;
    text-align: center;
}

.container {
    width: 80%;
    margin: auto;
    overflow: hidden;
    padding: 20px 0;
}

.note-container {
    background: transparent;
    padding: 0;
}

.mcq-block {
    background: #fff;
    border: 1px solid #ddd;
    border-radius: 8px;
    padding: 20px;
    margin-bottom: 20px;
    box-shadow: 0 2px 5px rgba(0,0,0,0.05);
    position: relative; /* আইকন পজিশনিং এর জন্য জরুরি */
}

.mcq-meta {
    font-size: 0.9em;
    color: #555;
    background-color: #e9ecef;
    padding: 5px 10px;
    border-radius: 5px;
    display: inline-block;
    margin-bottom: 15px;
}

.question {
    font-weight: bold;
    margin-bottom: 10px;
    padding-right: 40px; /* আইকনের জন্য জায়গা রাখা */
}

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

.options li {
    margin-bottom: 8px;
    padding: 8px;
    border-radius: 3px;
    border: 1px solid #eee;
    transition: all 0.3s ease; /* মসৃণ কালার পরিবর্তনের জন্য */
}

/* এই ক্লাসটি JavaScript দিয়ে যোগ করা হবে */
.correct-answer {
    background-color: #d4edda;
    color: #155724;
    border-color: #c3e6cb;
    font-weight: bold;
}

/* চোখের আইকনের জন্য CSS */
.toggle-answer-btn {
    position: absolute;
    top: 20px;
    right: 20px;
    background: none;
    border: none;
    font-size: 1.5rem; /* আইকনের আকার */
    cursor: pointer;
    color: #555;
}