
    :root {
        --primary-color: #2563eb; /* Blue-600 */
        --secondary-color: #4f46e5; /* Indigo-600 */
        --background-color: #f3f4f6; /* Gray-100 */
        --card-background: #ffffff;
        --text-primary: #1f2937;    /* Gray-800 */
        --text-secondary: #6b7280; /* Gray-500 */
        --border-color: #e5e7eb;   /* Gray-200 */
        --success-color: #16a34a;  /* Green-600 */
        --danger-color: #ef4444;   /* Red-500 */
        --warning-color: #f59e0b;  /* Amber-500 */
        --purple-color-dark: #7e22ce; /* Purple-700 */
        --purple-color-medium: #5b21b6;/* Purple-700 Alt? */
        --purple-color-light: #ede9fe; /* Purple-100 */
        --purple-border-light: #c4b5fd;/* Purple-300 */
        --green-light: #dcfce7;    /* green-100 */
        --green-dark: #166534;     /* green-700 */
        --green-border: #86efac;   /* green-300 */
        --red-light: #fee2e2;      /* red-100 */
        --red-dark: #b91c1c;       /* red-700 */
        --red-border: #fca5a5;     /* red-300 */
        --gray-light: #f9fafb;     /* gray-50 */
        --blue-light-bg: #eff6ff;  /* blue-50 */
    }
    body {
        background-color: var(--background-color);
        font-family: 'Inter', sans-serif; /* Ensure Inter font is linked in <head> */
        color: var(--text-primary);
    }
    .header-bg { background-color: var(--card-background); border-bottom: 1px solid var(--border-color); }
    .primary-text { color: var(--primary-color); }
    .primary-bg { background-color: var(--primary-color); }
    .mock-test-container, .sidebar-card { /* Basic card style */
        background-color: var(--card-background);
        border-radius: 0.75rem;
        box-shadow: 0 4px 6px -1px rgb(0 0 0 / 0.07), 0 2px 4px -2px rgb(0 0 0 / 0.07);
    }

    /* --- Mock Test Specific Styles --- */
    .timer {
        font-size: 1.0rem; font-weight: 600; color: var(--danger-color);
        background-color: var(--red-light); padding: 0.3rem 0.7rem;
        border-radius: 999px; flex-shrink: 0;
    }
    .test-header h2 { font-size: 1.0rem; font-weight: 600; }
    .progress-container { margin-top: 0.5rem; margin-bottom: 0.75rem; }
    .question-title {
        font-size: 1.0rem; font-weight: 600; margin-bottom: 1rem;
        line-height: 1.5; color: var(--text-primary);
    }

    /* --- FINAL Corrected Option Styles --- */
    .options-container .option-wrapper {
        display: flex;           /* Use flexbox for overall alignment */
        align-items: flex-start; /* Align radio button to the top of the content */
        margin-bottom: 0.6rem;
        padding: 0.7rem 0.9rem;
        border: 1px solid var(--border-color);
        border-radius: 6px;
        cursor: pointer;
        transition: background-color 0.2s, border-color 0.2s;
        background-color: #fff;
    }
    .options-container .option-wrapper:hover {
        background-color: var(--gray-light);
        border-color: #9ca3af;
    }
    .options-container input[type="radio"] {
        margin-top: 0.2rem;   /* Adjust vertical position of radio */
        margin-right: 0.7rem; /* Space between radio and label */
        width: 1.1em; height: 1.1em;
        flex-shrink: 0;
        accent-color: var(--primary-color);
        cursor: pointer;
    }
    .options-container .option-wrapper label {
        flex-grow: 1;          /* Take remaining space */
        display: block;        /* Label behaves like a block */
        cursor: pointer;
        line-height: 1.5;
        color: var(--text-primary);
        font-size: 0.9rem;     /* Smaller option text */
    }
     /* Style the A./B. prefix part */
    .options-container .option-wrapper label span.option-prefix {
         display: inline-block; /* Keep inline */
         min-width: 1.4rem;    /* Consistent space for A. B. C. D. */
         font-weight: 500;
         margin-right: 0.4rem; /* Space after prefix */
         color: var(--text-secondary);
         vertical-align: top;  /* Align prefix with top of text line */
    }
     /* Style the actual option text or image content */
    .options-container .option-wrapper label span.option-content {
         display: inline;      /* Allow text to wrap naturally after prefix */
         word-break: break-word;
         vertical-align: top;  /* Align content with top of text line */
    }
    /* Style wrapper when its radio is checked */
    .options-container .option-wrapper:has(input[type="radio"]:checked) {
        border-color: var(--primary-color);
        background-color: var(--blue-light-bg);
    }
    /* Style label text when its radio is checked */
    .options-container .option-wrapper input[type="radio"]:checked + label {
       /* font-weight: 600; - Optional: Make selected text bold */
       color: var(--primary-color); /* Make selected text blue */
    }
    .option-image {
        max-height: 45px; max-width: 100%; display: inline-block;
        vertical-align: middle; /* Align image vertically */
        margin-left: 0; /* No margin needed if inside content span */
        border: 1px solid var(--border-color); border-radius: 4px;
    }
    /* --- End Corrected Option Styles --- */

    .test-navigation {
        margin-top: 1rem; display: flex; justify-content: space-between; align-items: center;
        border-top: 1px solid var(--border-color); padding-top: 0.75rem;
        flex-wrap: wrap; gap: 4px;
    }
    .test-navigation button, .scorecard-actions button, .scorecard-actions a {
         padding: 5px 12px; border: 1px solid var(--border-color); border-radius: 6px;
         font-size: 0.8rem; font-weight: 500; cursor: pointer; background-color: #fff;
         transition: all 0.2s; color: var(--text-primary);
    }
    .test-navigation button:disabled { opacity: 0.5; cursor: not-allowed; background-color: #f9fafb; }
    .test-navigation button:not(:disabled):hover, .scorecard-actions button:hover, .scorecard-actions a:hover { background-color: #f3f4f6; }
    .submit-btn { background-color: var(--success-color); color: white; border-color: var(--success-color); }
    .submit-btn:hover:not(:disabled) { background-color: #15803d; border-color: #15803d; }
    #palette-modal-btn { background-color: #f3f4f6; } #palette-modal-btn:hover { background-color: #e5e7eb; }
    .scorecard-actions a { background-color: var(--primary-color); color: white; border-color: var(--primary-color);}
    .scorecard-actions a:hover { background-color: #1d4ed8; border-color: #1d4ed8; }
    .question-image { max-height: 200px; max-width: 100%; display: block; margin: 1rem auto; border: 1px solid var(--border-color); border-radius: 8px; }

    .suggested-test-card button { font-size: 0.875rem; padding: 0.25rem 0.75rem; border-radius: 6px; background-color: var(--primary-color); color: white; transition: background-color 0.2s; border: none; }
    .suggested-test-card button:hover { background-color: #1d4ed8; }

    /* --- Palette Styles --- */
    .palette-item { display: flex; align-items: center; justify-content: center; width: 36px; height: 36px; border: 1px solid #d1d5db; border-radius: 6px; font-weight: 500; text-decoration: none; color: #374151; background-color: var(--gray-light); cursor: pointer; transition: all 0.2s; position: relative; }
    .palette-item:hover { border-color: var(--primary-color); }
    .palette-item.not-visited { background-color: var(--gray-light); color: #374151; }
    .palette-item.not-answered { background-color: var(--red-light); color: var(--red-dark); border-color: var(--red-border); }
    .palette-item.answered { background-color: var(--green-light); color: var(--green-dark); border-color: var(--green-border); }
    .palette-item.marked-review { background-color: var(--purple-color-light); color: var(--purple-color-medium); border-color: var(--purple-border-light); }
    .palette-item.answered-marked-review { background-color: var(--green-light); color: var(--green-dark); border-color: var(--green-border); }
    .palette-item.answered-marked-review::after { content: ''; position: absolute; bottom: 4px; right: 4px; width: 8px; height: 8px; border-radius: 50%; background-color: var(--purple-color-dark); }
    .palette-item.current { border-width: 2px; border-color: var(--primary-color); transform: scale(1.1); }
    #modal-palette-content { max-height: 60vh; overflow-y: auto; }

    /* --- Section Tab Styles --- */
    #section-tabs-container { overflow-x: auto; white-space: nowrap; -ms-overflow-style: none; scrollbar-width: none; border-bottom: 1px solid var(--border-color); margin-bottom: 1rem;}
    #section-tabs-container::-webkit-scrollbar { display: none; }
    #section-tabs { display: flex; }
    #section-tabs a { padding: 8px 16px; border-bottom: 3px solid transparent; font-size: 0.95rem; font-weight: 500; color: var(--text-secondary); text-decoration: none; white-space: nowrap; transition: all 0.2s; display: inline-block; margin-bottom: -1px; }
    #section-tabs a:hover { border-bottom-color: var(--border-color); color: var(--text-primary); }
    #section-tabs a.active-section { border-bottom-color: var(--primary-color); color: var(--primary-color); font-weight: 600; }

    .exam-card {
        border: 1px solid var(--border-color);
        border-radius: 8px;
        padding: 1rem; /* Increased padding */
        text-align: center;
        cursor: pointer;
        transition: all 0.2s ease-in-out;
        background-color: var(--card-background);
    }
    .exam-card:hover {
        border-color: #9ca3af;
        box-shadow: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    }
    .exam-card.selected {
        border-color: var(--primary-color);
        background-color: var(--blue-light-bg);
        transform: scale(1.03);
        border-width: 2px;
    }
    .exam-card img {
        max-height: 404px; /* << INCREASED ICON HEIGHT */
        margin: 0 auto 0.75rem auto; /* << INCREASED bottom margin */
        display: block;
        opacity: 0.7;
    }
    .exam-card span {
        font-weight: 500;
        color: var(--text-primary);
        font-size: 0.875rem; /* << INCREASED FONT SIZE (14px) */
        display: block;
        line-height: 1.3;
    }
