.start-btn,.next-btn,.skip-btn,.submit-btn{border-radius:15px;border:none;background-color:#098bcb;color:white;cursor:pointer;padding:15px;width:80px;}.start-btn{background-color:blue;}.next-btn,.submit-btn,#timer{float:right;margin-right:30px;}.review-btn,.retry-btn{border-radius:15px;border:none;background-color:#098bcb;color:white;cursor:pointer;padding:15px;}.question{border-radius:15px;border:1px solid #ccc;margin-bottom:100px;font-size:18px;position:absolute;left:50%;transform:translateX(-50%);width:90%;padding:5px;}.options label{display:block;margin:5px;padding:15px;font-weight:100;margin-bottom:10px;border-radius:15px;cursor:pointer;}.options label:hover{background-color:lightblue;}.options input[type="radio"]{display:none;}.options input[type="radio"]:checked + label{background-color:blue;color:white;}.submit-btn,.next-btn,.skip-btn{margin-top:10px;}#result{width:99%;margin-top:20px;font-weight:bold;}#review-questions{width:95%;border:1px solid #ccc;display:none;border-radius:10px;padding:10px;margin-top:20px;position:absolute;left:50%;transform:translateX(-50%);}.modal{display:none;position:fixed;z-index:1;width:99%;position:absolute;left:50%;transform:translateX(-50%);top:2%;overflow:auto;text-align:center;}.modal-content{background-color:#fefefe;margin:10px;padding:10px;border:1px solid #888;margin-bottom:1px;text-align:left;border-radius:15px;}.start-btn,.close-btn,.review-btn,.retry-btn{margin-top:20px;padding:10px;font-size:16px;}.retry-btn{background-color:#f44336;float:right;color:white;border:none;padding:10px 24px;text-align:center;text-decoration:none;display:inline-block;cursor:pointer;transition-duration:0.4s;}.correct-answer{padding:15px;border-radius:15px;color:rgb(5,165,5);}.incorrect-answer{padding:15px;border-radius:15px;color:red;}.default-color{padding:15px;}.blue-text{color:blue;font-weight:bold;padding:15px;}.selected{background-color:blue !important;color:white;}h3{text-align:center;}@media screen and (min-width:1000px){.modal{display:none;position:fixed;z-index:1;width:50%;position:absolute;left:50%;transform:translateX(-50%);top:2%;overflow:auto;text-align:center;}}
  .box-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 1.5rem; margin-bottom: 2rem; }
            .box {
             padding: 2rem; text-align: center; transition: transform 0.2s ease, box-shadow 0.2s ease;
             background: linear-gradient(135deg, color-mix(in srgb, var(--accent-color) 8%, var(--card-bg)), var(--card-bg));
 
            }
            .box:hover { transform: translateY(-5px); box-shadow: var(--card-shadow); }
            .box a { text-decoration: none; color: var(--text-primary); font-size: 1.2rem; font-weight: 600; }
            .box a:hover { color: var(--accent-color); }
            .leaderboard-section { background-color: var(--card-bg); border: 1px solid var(--border-color); border-radius: var(--border-radius); padding: 2rem; margin-top: 3rem; }
            .leaderboard-section h2 { text-align: center; margin-top: 0; color: var(--accent-color); }
            .leaderboard { list-style: none; padding: 0; }
            .leaderboard li { display: flex; align-items: center; padding: 1rem; border-bottom: 1px solid var(--border-color); }
            .leaderboard li:last-child { border-bottom: none; }
            .leaderboard .rank { font-size: 1.2rem; font-weight: bold; color: var(--accent-color); min-width: 40px; }
            .leaderboard .avatar { width: 40px; height: 40px; border-radius: 50%; margin-right: 1rem; object-fit: cover; }
            .leaderboard .name { font-weight: 500; flex-grow: 1; color: var(--text-primary); }
            .leaderboard .score { font-weight: bold; color: var(--text-secondary); }
             .button-group { display: flex; gap: 1rem; justify-content: center; align-items: center; }

/* --- General Quiz Styles --- */
#quiz-section {
    display: none; /* Hidden until quiz starts */
}

#quiz-layout {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

#question-area {
    flex-grow: 1;
    min-width: 0;
}

#question-palette-container {
    flex-shrink: 0;
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    padding: 1rem;
    box-shadow: var(--card-shadow);
}

.palette-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
    padding-bottom: 0.75rem;
    border-bottom: 1px solid var(--border-color);
}

.palette-header h4 {
    margin: 0;
    font-size: 1.1rem;
    color: var(--text-primary);
}

#question-palette {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(40px, 1fr));
    gap: 0.75rem;
}

.palette-item {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
    border: 2px solid transparent;
}

/* --- Palette Item States --- */
.palette-item.unvisited {
    background-color: var(--input-bg);
    border-color: var(--border-color);
    color: var(--text-secondary);
}
.palette-item.unvisited:hover {
    border-color: var(--accent-color);
    color: var(--accent-color);
}

.palette-item.answered {
    background-color: var(--primary-color);
    color: var(--white);
    border-color: var(--primary-color);
}

.palette-item.skipped {
    background-color: transparent;
    border-color: var(--danger-color);
    color: var(--danger-color);
}

.palette-item.current {
    border-color: var(--accent-color);
    box-shadow: 0 0 0 3px var(--blue-transparent-focus);
    transform: scale(1.1);
}


/* --- Question Block --- */
.question-block {
    margin-bottom: 1.5rem;
    padding: 1.5rem;
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
}
.question { font-size: 1.2rem; font-weight: 600; margin-bottom: 1.5rem; line-height: 1.5; }
.options label {
    display: flex;
    align-items: center;
    padding: 0.8rem 1rem;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    margin-bottom: 0.75rem;
    cursor: pointer;
    transition: background-color 0.2s ease, border-color 0.2s ease;
}
.options label:hover { background-color: var(--input-bg); }
.options input[type="radio"] { margin-right: 10px; }
.options input[type="radio"]:checked + span { font-weight: bold; color: var(--accent-color); }


/* --- Navigation Buttons --- */
#question-navigation-buttons {
    display: flex;
    justify-content: space-between;
    margin-top: 1.5rem;
}

.skip-btn, .next-btn, .submit-btn {
    border-radius: 25px;
    border: none;
    cursor: pointer;
    padding: 0.8rem 1.8rem;
    font-size: 1rem;
    font-weight: 500;
    transition: all 0.2s ease;
}
.skip-btn {
    background-color: transparent;
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
}
.skip-btn:hover { background-color: var(--input-bg); }

.next-btn, .submit-btn {
    background-color: var(--accent-color);
    color: white;
}
.next-btn:hover, .submit-btn:hover {
    background-color: color-mix(in srgb, var(--accent-color) 80%, black);
}
#main-submit-btn {
    padding: 0.5rem 1rem;
    font-size: 0.9rem;
}

/* --- Modals --- */
.modal {
    display: none;
    position: fixed;
    z-index: 1002;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    overflow: auto;
    background-color: var(--overlay-bg);
}
.modal.active {
    display: flex;
    align-items: center;
    justify-content: center;
}
.modal-content {
  background-color: var(--card-bg);
  margin: auto;
  padding: 2rem;
  border: 1px solid var(--border-color);
  width: 90%;
  max-width: 500px;
  border-radius: var(--border-radius);
  box-shadow: var(--card-shadow);
  text-align: center;
}

/* --- Review Styles --- */
#review-questions { display: none; }
.review-btn, .retry-btn { margin: 0.5rem; }
.review .options label {
    cursor: default;
}
.review .options label:hover {
    background-color: transparent;
}
.review .options label.correct-option { background-color: rgba(40, 167, 69, 0.1); border-color: var(--success-color); }
.review .options label.incorrect-option { background-color: rgba(220, 53, 69, 0.1); border-color: var(--danger-color); }
#review-questions .explanation {
    margin-top: 1rem;
    padding: 1rem;
    background-color: var(--input-bg);
    border-radius: 8px;
    border-left: 4px solid var(--accent-color);
    text-align: left;
}


/* --- Responsive Design --- */
@media (min-width: 768px) {
    #quiz-layout {
        flex-direction: row;
        align-items: flex-start;
    }
    #question-palette-container {
        width: 240px;
        position: sticky;
        top: 80px; /* Header height + margin */
    }
    #question-palette {
        grid-template-columns: repeat(auto-fill, minmax(40px, 1fr));
    }
}