/**
 * @license
 * SPDX-License-Identifier: Apache-2.0
*/

:root {
    --font-family-base: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol";

    /* Light Theme (Default) */
    --bg-color: #f0f2f5;
    --text-color: #1c1e21;
    --text-color-light: #606770;
    --text-color-strong: #050505;
    --text-color-inverted: #ffffff;
    --link-color: #1877f2;
    --link-hover-color: #166fe5;

    --container-bg-color: #ffffff;
    --container-border-color: #dddfe2;
    --container-shadow: 0 4px 12px rgba(0,0,0,0.1);

    --header-bg-color: #1877f2;
    --header-text-color: #ffffff;

    --button-primary-bg-color: #1877f2;
    --button-primary-text-color: #ffffff;
    --button-primary-hover-bg-color: #166fe5;

    --button-secondary-bg-color: #e4e6eb;
    --button-secondary-text-color: #050505;
    --button-secondary-hover-bg-color: #d8dade;
    --button-secondary-border-color: #bec3c9;

    --input-bg-color: #f5f6f7;
    --input-border-color: #ccd0d5;
    --input-focus-border-color: #1b74e4;
    --input-focus-shadow-color: rgba(27, 116, 228, 0.2);

    --select-arrow-icon-fill: '#555';

    --correct-bg-color: #e6ffed;
    --correct-border-color: #5cb85c;
    --correct-text-color: #3d7a3d;

    --incorrect-bg-color: #ffebee;
    --incorrect-border-color: #d9534f;
    --incorrect-text-color: #a94442;

    --disabled-bg-color: #e9ebee;
    --disabled-text-color: #bcc0c4;
    --disabled-border-color: #dddfe2;

    --pte-blank-border-dashed-color: #606770;
    --pte-blank-filled-bg-color: #e9ecef;
    --pte-blank-filled-border-color: #a0a0a0;
    --pte-blank-drag-over-bg-color: #cfe2ff; /* Used for desktop drag over and tap-selected blank */
    --pte-blank-drag-over-border-color: #1877f2;
    --pte-word-bank-bg: #f9f9f9;
    --pte-word-bank-word-bg: #fff;
    --pte-word-bank-used-bg: #e9ecef;
    --pte-word-bank-used-text: #6c757d;
    --pte-word-bank-used-border: #ced4da;
    --dragging-opacity: 0.5;
}

body.dark-mode {
    --bg-color: #18191a;
    --text-color: #e4e6eb;
    --text-color-light: #b0b3b8;
    --text-color-strong: #f5f6f7;
    --text-color-inverted: #1c1e21;
    --link-color: #4599ff;
    --link-hover-color: #62aaff;

    --container-bg-color: #242526;
    --container-border-color: #3a3b3c;
    --container-shadow: 0 4px 12px rgba(0,0,0,0.3);

    --header-bg-color: #1c6ddc;

    --button-primary-bg-color: #2374e1;
    --button-primary-hover-bg-color: #3982e4;

    --button-secondary-bg-color: #3a3b3c;
    --button-secondary-text-color: #e4e6eb;
    --button-secondary-hover-bg-color: #4e4f50;
    --button-secondary-border-color: #545556;

    --input-bg-color: #3a3b3c;
    --input-border-color: #545556;
    --input-focus-border-color: #4599ff;
    --input-focus-shadow-color: rgba(69, 153, 255, 0.25);

    --select-arrow-icon-fill: '#b0b3b8';

    --correct-bg-color: #2a3b2a;
    --correct-border-color: #4a7d4a;
    --correct-text-color: #a7d7a7;

    --incorrect-bg-color: #3c2628;
    --incorrect-border-color: #8c4340;
    --incorrect-text-color: #f1b0ad;

    --disabled-bg-color: #303031;
    --disabled-text-color: #7a7a7a;
    --disabled-border-color: #424243;

    --pte-blank-border-dashed-color: #b0b3b8;
    --pte-blank-filled-bg-color: #3a3b3c;
    --pte-blank-filled-border-color: #545556;
    --pte-blank-drag-over-bg-color: #304a6e;  /* Used for desktop drag over and tap-selected blank */
    --pte-blank-drag-over-border-color: #4599ff;
    --pte-word-bank-bg: #2f3031;
    --pte-word-bank-word-bg: #3a3b3c;
    --pte-word-bank-used-bg: #4e4f50;
    --pte-word-bank-used-text: #9a9b9c;
    --pte-word-bank-used-border: #545556;
}

html {
    font-size: 100%;
}

body {
    font-family: var(--font-family-base);
    line-height: 1.6;
    margin: 0;
    padding: 20px;
    background-color: var(--bg-color);
    color: var(--text-color);
    display: flex;
    justify-content: center;
    align-items: flex-start;
    min-height: 100vh;
    transition: background-color 0.3s ease, color 0.3s ease;
}

#app-container {
    max-width: 800px;
    width: 100%;
    margin: 20px auto;
    background: var(--container-bg-color);
    padding: 25px 30px;
    border-radius: 12px;
    box-shadow: var(--container-shadow);
    border: 1px solid var(--container-border-color);
    position: relative;
    transition: background-color 0.3s ease, border-color 0.3s ease;
}

.app-header {
    background-color: var(--header-bg-color);
    color: var(--header-text-color);
    padding: 15px 20px;
    margin: -25px -30px 20px -30px;
    border-radius: 12px 12px 0 0;
    text-align: center;
    transition: background-color 0.3s ease;
}

.header-top-row {
    display: flex;
    align-items: center;
    margin-bottom: 10px;
}
.header-top-row h1 {
    margin: 0 auto;
    font-size: 1.8rem;
    font-weight: 600;
    text-align: center;
}

.header-action-placeholder {
    width: 34px;
    height: 34px;
    flex-shrink: 0;
}


#theme-toggle-btn {
    background: none;
    border: none;
    color: var(--header-text-color);
    cursor: pointer;
    padding: 5px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background-color 0.2s ease;
    flex-shrink: 0;
}
#theme-toggle-btn:hover {
    background-color: rgba(255,255,255,0.2);
}
.dark-mode #theme-toggle-btn:hover {
    background-color: rgba(0,0,0,0.2);
}

#mode-switcher-container {
    display: flex;
    justify-content: center;
    gap: 10px;
    margin-top: 10px;
}

.mode-btn {
    padding: 0.5rem 1rem;
    font-size: 0.95rem;
    font-weight: 600;
    border: 2px solid rgba(255, 255, 255, 0.8);
    border-radius: 8px;
    background-color: transparent;
    color: var(--header-text-color);
    cursor: pointer;
    transition: background-color 0.2s ease, color 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
    text-shadow: 1px 1px 2px rgba(0, 0, 0, 0.2);
}

.mode-btn:hover:not(.active):not(:disabled) {
    background-color: rgba(255, 255, 255, 0.15);
    border-color: #ffffff;
}

.mode-btn.active {
    background-color: #ffffff;
    color: var(--header-bg-color);
    font-weight: 700;
    border-color: #ffffff;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
    text-shadow: none;
}


/* Category Navigation Bar Styles */
#category-navigation-bar-wrapper {
    display: flex;
    align-items: center;
    margin-bottom: 1rem;
    padding: 0.5rem 0;
    background-color: var(--bg-color);
    border-radius: 8px;
    border: 1px solid var(--container-border-color);
    transition: background-color 0.3s ease, border-color 0.3s ease;
}

#category-navigation-bar-container {
    flex-grow: 1;
    overflow: hidden;
    position: relative;
}

#category-navigation-bar {
    display: flex;
    gap: 0.5rem;
    padding: 0 0.625rem;
    white-space: nowrap;
    transition: transform 0.3s ease-in-out;
    overflow-x: auto; /* Enable native scroll for accessibility if JS arrows fail */
    -webkit-overflow-scrolling: touch; /* Smooth scrolling on iOS */
    scrollbar-width: none; /* Firefox */
}
#category-navigation-bar::-webkit-scrollbar { /* Chrome, Safari, Edge */
    display: none;
}


.category-nav-btn {
    padding: 0.5rem 0.9375rem;
    font-size: 0.9rem;
    font-weight: 500;
    border: 1px solid var(--input-border-color);
    border-radius: 6px;
    background-color: var(--container-bg-color);
    color: var(--text-color-strong);
    cursor: pointer;
    transition: background-color 0.2s ease, color 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
    flex-shrink: 0;
}

.category-nav-btn:hover:not(:disabled) {
    background-color: var(--button-secondary-hover-bg-color);
    border-color: var(--button-secondary-border-color);
}

.category-nav-btn.active {
    background-color: var(--button-primary-bg-color);
    color: var(--button-primary-text-color);
    border-color: var(--button-primary-bg-color);
    font-weight: 600;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}
.dark-mode .category-nav-btn.active {
    box-shadow: 0 2px 4px rgba(0,0,0,0.3);
}

.category-nav-arrow {
    background-color: var(--button-secondary-bg-color);
    border: 1px solid var(--button-secondary-border-color);
    color: var(--button-secondary-text-color);
    padding: 0.5rem 0.625rem;
    font-size: 1rem;
    font-weight: bold;
    cursor: pointer;
    border-radius: 6px;
    margin: 0 0.3125rem;
    flex-shrink: 0;
    transition: background-color 0.2s ease, opacity 0.2s;
}
.category-nav-arrow:hover:not(:disabled) {
    background-color: var(--button-secondary-hover-bg-color);
}
.category-nav-arrow:disabled {
    opacity: 0.4;
    cursor: not-allowed;
    background-color: var(--disabled-bg-color);
    border-color: var(--disabled-border-color);
}


/* Hamburger Menu Button */
#hamburger-btn {
    position: fixed;
    top: 25px;
    right: 30px;
    width: 40px;
    height: 35px;
    display: flex;
    flex-direction: column;
    justify-content: space-around;
    background: var(--button-primary-bg-color);
    border: none;
    border-radius: 5px;
    cursor: pointer;
    padding: 8px 6px;
    z-index: 1002;
    box-shadow: 0 2px 5px rgba(0,0,0,0.2);
    transition: background-color 0.3s ease;
}
.dark-mode #hamburger-btn {
    box-shadow: 0 2px 5px rgba(0,0,0,0.4);
}


#hamburger-btn span {
    display: block;
    width: 28px;
    height: 3px;
    background: var(--button-primary-text-color);
    border-radius: 3px;
    transition: all 0.3s ease-in-out;
}

#hamburger-btn.open span:nth-child(1) { transform: translateY(9px) rotate(45deg); }
#hamburger-btn.open span:nth-child(2) { opacity: 0; }
#hamburger-btn.open span:nth-child(3) { transform: translateY(-9px) rotate(-45deg); }


/* Side Menu Panel */
#side-menu-panel {
    position: fixed;
    top: 0;
    right: -325px; /* Adjusted from -300px */
    width: 280px;
    height: 100%;
    background-color: var(--container-bg-color);
    box-shadow: -2px 0 8px rgba(0,0,0,0.15);
    transition: right 0.3s ease-in-out, background-color 0.3s ease, border-color 0.3s ease;
    z-index: 1001;
    padding: 1.25rem;
    padding-top: 1.25rem;
    overflow-y: auto;
    border-left: 1px solid var(--container-border-color);
    display: flex;
    flex-direction: column;
}
.dark-mode #side-menu-panel {
    box-shadow: -2px 0 8px rgba(0,0,0,0.4);
}

#side-menu-panel.side-menu-open { right: 0; }

#side-menu-panel h2 {
    margin-top: 0;
    margin-bottom: 0.625rem;
    font-size: 1.4rem;
    color: var(--link-color);
    padding-bottom: 0.625rem;
    border-bottom: 1px solid var(--input-border-color);
    flex-shrink: 0;
    transition: color 0.3s ease, border-color 0.3s ease;
}

#side-menu-list {
    list-style: none;
    padding: 0;
    margin: 0;
    overflow-y: auto;
    flex-grow: 1;
}

#side-menu-list li a {
    display: block;
    padding: 0.625rem 0.3125rem;
    text-decoration: none;
    color: var(--text-color);
    border-bottom: 1px solid var(--bg-color);
    transition: background-color 0.2s ease, color 0.2s ease;
    font-size: 0.95rem;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

#side-menu-list li a:hover {
    background-color: var(--bg-color);
    color: var(--link-color);
}
#side-menu-list li:last-child a { border-bottom: none; }

/* For messages like "No questions" in side menu */
#side-menu-list li {
    padding: 0.625rem 0.3125rem;
    color: var(--text-color-light);
}


/* Menu Overlay */
#menu-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    display: none;
    z-index: 1000;
}
.dark-mode #menu-overlay {
    background-color: rgba(0, 0, 0, 0.7);
}

#menu-overlay.overlay-active { display: block; }


/* Settings Controls */
#settings-controls {
    margin-top: 1.5rem;
    display: flex;
    flex-direction: column;
    gap: 1rem;
    padding: 1rem 0.625rem;
    background-color: var(--bg-color);
    border-radius: 8px;
    border: 1px solid var(--input-border-color);
    transition: background-color 0.3s ease, border-color 0.3s ease;
}

.setting-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    width: 100%;
}

#settings-controls label {
    font-size: 0.95rem;
    color: var(--text-color);
    font-weight: 500;
    margin-right: 0.5rem;
    transition: color 0.3s ease;
}

#questions-per-page-select {
    padding: 0.5rem 0.75rem;
    border-radius: 6px;
    border: 1px solid var(--input-border-color);
    background-color: var(--input-bg-color);
    font-size: 0.9rem;
    min-width: 60px;
    color: var(--text-color-strong);
    appearance: none;
    background-image: url('data:image/svg+xml;charset=US-ASCII,%3Csvg%20width%3D%2220%22%20height%3D%2220%22%20xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%22%3E%3Cpath%20d%3D%22M5%208l5%205%205-5z%22%20fill%3D%22${encodeURIComponent(getComputedStyle(document.documentElement).getPropertyValue('--select-arrow-icon-fill'))}%22%2F%3E%3C%2Fsvg%3E');
    background-repeat: no-repeat;
    background-position: right 8px center;
    background-size: 12px 12px;
    padding-right: 30px;
    transition: border-color 0.2s ease-in-out, background-color 0.2s ease-in-out, box-shadow 0.2s ease-in-out, color 0.3s ease;
}
#questions-per-page-select:focus {
    outline: none;
    border-color: var(--input-focus-border-color);
    box-shadow: 0 0 0 2px var(--input-focus-shadow-color);
    background-color: var(--container-bg-color);
}
.dark-mode #questions-per-page-select {
     background-image: url('data:image/svg+xml;charset=US-ASCII,%3Csvg%20width%3D%2220%22%20height%3D%2220%22%20xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%22%3E%3Cpath%20d%3D%22M5%208l5%205%205-5z%22%20fill%3D%22%23b0b3b8%22%2F%3E%3C%2Fsvg%3E');
}


.text-size-controls {
    display: flex;
    gap: 0.5rem;
}
.text-size-controls button {
    padding: 0.4rem 0.8rem;
    font-size: 0.9rem;
    font-weight: 500;
    border: 1px solid var(--button-secondary-border-color);
    border-radius: 6px;
    background-color: var(--button-secondary-bg-color);
    color: var(--button-secondary-text-color);
    cursor: pointer;
    transition: background-color 0.2s ease, transform 0.1s ease;
}
.text-size-controls button:hover:not(:disabled) {
    background-color: var(--button-secondary-hover-bg-color);
}
.text-size-controls button:active:not(:disabled) {
    transform: translateY(1px);
}
.text-size-controls button:disabled {
    background-color: var(--disabled-bg-color);
    color: var(--disabled-text-color);
    border-color: var(--disabled-border-color);
    cursor: not-allowed;
}


#question-title-main {
    color: var(--text-color);
    margin-top: 0;
    margin-bottom: 1rem;
    padding-bottom: 0.625rem;
    font-size: 1.3rem;
    font-weight: 600;
    border-bottom: 1px solid var(--input-border-color);
    transition: color 0.3s ease, border-color 0.3s ease;
}

#question-prompt-container { margin-bottom: 1.25rem; }

/* Loading Progress Bar */
#loading-container {
    padding: 2rem 1rem;
    text-align: center;
}

#loading-status-text {
    margin-bottom: 1rem;
    font-size: 1.1rem;
    color: var(--text-color-light);
    transition: color 0.3s ease;
}

#progress-bar-container {
    width: 100%;
    max-width: 400px;
    margin: 0 auto;
    background-color: var(--input-bg-color);
    border: 1px solid var(--input-border-color);
    border-radius: 8px;
    overflow: hidden;
    transition: background-color 0.3s ease, border-color 0.3s ease;
}

#progress-bar {
    width: 0%;
    height: 18px;
    background-color: var(--button-primary-bg-color);
    border-radius: 8px 0 0 8px;
    transition: width 0.4s ease-in-out, background-color 0.3s ease;
}

#progress-bar[style*="width: 100%"] {
    border-radius: 8px;
}


.rwfib-question-item {
    padding: 1rem;
    margin-bottom: 1.25rem;
    border: 1px solid var(--input-border-color);
    border-radius: 8px;
    background-color: var(--container-bg-color);
    position: relative;
    transition: background-color 0.3s ease, border-color 0.3s ease;
}
.dark-mode .rwfib-question-item {
    background-color: var(--bg-color);
}
.rwfib-question-item:last-child { margin-bottom: 0; }

.rwfib-question-item-title {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-color-strong);
    margin-bottom: 0.625rem;
    transition: color 0.3s ease;
}

.rwfib-question-item-categories {
    display: block;
    font-size: 0.8rem;
    color: var(--text-color-light);
    font-weight: normal;
    margin-top: 0.25rem;
    transition: color 0.3s ease;
}

/* RWFIB Specific Prompt Styles */
.rwfib-question-item-prompt {
    font-size: 1.05rem;
    line-height: 2.2;
    color: var(--text-color);
    margin-bottom: 1rem;
    transition: color 0.3s ease;
    text-align: justify;
}

.rwfib-select {
    padding: 0.5rem 0.75rem;
    margin: 0 0.3125rem;
    border-radius: 6px;
    border: 1px solid var(--input-border-color);
    background-color: var(--input-bg-color);
    color: var(--text-color-strong);
    font-size: 0.95rem;
    min-width: 130px;
    cursor: pointer;
    transition: border-color 0.2s ease-in-out, background-color 0.2s ease-in-out, box-shadow 0.2s ease-in-out, color 0.3s ease;
    appearance: none;
    background-image: url('data:image/svg+xml;charset=US-ASCII,%3Csvg%20width%3D%2220%22%20height%3D%2220%22%20xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%22%3E%3Cpath%20d%3D%22M5%208l5%205%205-5z%22%20fill%3D%22${encodeURIComponent(getComputedStyle(document.documentElement).getPropertyValue('--select-arrow-icon-fill'))}%22%2F%3E%3C%2Fsvg%3E');
    background-repeat: no-repeat;
    background-position: right 8px center;
    background-size: 12px 12px;
    padding-right: 30px;
}
.dark-mode .rwfib-select {
    background-image: url('data:image/svg+xml;charset=US-ASCII,%3Csvg%20width%3D%2220%22%20height%3D%2220%22%20xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%22%3E%3Cpath%20d%3D%22M5%208l5%205%205-5z%22%20fill%3D%22%23b0b3b8%22%2F%3E%3C%2Fsvg%3E');
}

.rwfib-select:focus {
    outline: none;
    border-color: var(--input-focus-border-color);
    box-shadow: 0 0 0 2px var(--input-focus-shadow-color);
    background-color: var(--container-bg-color);
}

.rwfib-select:disabled {
    cursor: not-allowed;
    /* opacity: 0.8; */ /* Commented out to allow correct/incorrect colors to be prominent */
    /* background-color: var(--disabled-bg-color); */ /* Commented out */
    /* border-color: var(--disabled-border-color); */  /* Commented out */
    /* color: var(--disabled-text-color); */           /* Commented out */
}

.rwfib-select-correct {
    background-color: var(--correct-bg-color);
    border-color: var(--correct-border-color);
    color: var(--correct-text-color);
    font-weight: bold;
}

.rwfib-select-incorrect {
    background-color: var(--incorrect-bg-color);
    border-color: var(--incorrect-border-color);
    color: var(--incorrect-text-color);
}

.rwfib-feedback-span {
    margin-left: 0.375rem;
    font-size: 0.9rem;
    vertical-align: middle;
    color: var(--text-color);
}

.rwfib-feedback-span .rwfib-user-answer-display {
    color: var(--incorrect-text-color);
    text-decoration: line-through;
}
.rwfib-feedback-span .rwfib-user-answer-display em { /* Style for "Not selected" */
    font-style: italic;
    text-decoration: none; /* No line-through for "Not selected" specifically */
     color: var(--incorrect-text-color); /* Ensure it's still red */
}


.rwfib-feedback-span .rwfib-correct-answer-value {
    font-weight: bold;
    color: var(--correct-text-color);
    text-decoration: none; /* Ensure no line-through */
}


/* PTE RFIB Specific Styles */
.pte-rfib-question-item-prompt {
    font-size: 1.05rem;
    line-height: 2.4;
    color: var(--text-color);
    margin-bottom: 1rem;
    transition: color 0.3s ease;
    text-align: justify;
}

.pte-rfib-blank-button {
    padding: 0.25rem 0.5rem;
    margin: 0 0.1875rem;
    border: 1px dashed var(--pte-blank-border-dashed-color);
    border-radius: 4px;
    background-color: var(--input-bg-color);
    color: var(--text-color-strong);
    font-size: 0.95rem;
    min-width: 60px;
    text-align: center;
    cursor: pointer; /* Changed from grab to pointer for tap interaction */
    transition: background-color 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease, color 0.3s ease;
    vertical-align: baseline;
    user-select: none;
}
/* No longer need :not(.pte-blank-filled) for cursor, as all are tappable */

.pte-rfib-blank-button.pte-blank-filled {
    border-style: solid;
    border-color: var(--pte-blank-filled-border-color);
    background-color: var(--pte-blank-filled-bg-color);
    cursor: grab; /* Restore grab for filled items that are draggable (desktop) */
}

/* Style for a blank selected via tap */
.pte-rfib-blank-button.pte-blank-selected-for-tap {
    border-color: var(--input-focus-border-color);
    border-width: 2px;
    border-style: solid; /* Ensure solid border when selected */
    box-shadow: 0 0 0 2px var(--input-focus-shadow-color);
    background-color: var(--pte-blank-drag-over-bg-color); /* Use a highlight color */
}


.pte-rfib-blank-button.drag-over-blank { /* For HTML5 D&D */
    background-color: var(--pte-blank-drag-over-bg-color);
    border-color: var(--pte-blank-drag-over-border-color);
    border-style: solid;
    box-shadow: 0 0 0 2px var(--input-focus-shadow-color);
}

.pte-rfib-blank-button:disabled {
    cursor: not-allowed;
    border-style: solid;
    background-color: var(--disabled-bg-color);
    border-color: var(--disabled-border-color);
    color: var(--disabled-text-color);
}

.pte-rfib-blank-button.pte-blank-correct {
    background-color: var(--correct-bg-color);
    border-color: var(--correct-border-color);
    color: var(--correct-text-color);
    font-weight: bold;
}

.pte-rfib-blank-button.pte-blank-incorrect {
    background-color: var(--incorrect-bg-color);
    border-color: var(--incorrect-border-color);
    /* General text color and decoration are handled by child spans */
}

.pte-rfib-blank-button.pte-blank-incorrect .user-answer-display {
    color: var(--incorrect-text-color);
    text-decoration: line-through;
}
.pte-rfib-blank-button.pte-blank-incorrect .user-answer-display em { /* For placeholder like [A] if not answered */
    font-style: italic;
    text-decoration: none;
     color: var(--incorrect-text-color);
}


.pte-rfib-blank-button.pte-blank-incorrect .correct-answer-label {
    color: var(--text-color); /* Use default text color for the label */
    text-decoration: none;
    font-weight: normal;
}

.pte-rfib-blank-button.pte-blank-incorrect .correct-answer-value {
    color: var(--correct-text-color);
    font-weight: bold;
    text-decoration: none;
}


.pte-word-bank-container {
    margin-top: 1rem;
    padding: 0.625rem;
    border: 1px solid var(--input-border-color);
    border-radius: 6px;
    background-color: var(--pte-word-bank-bg);
    min-height: 50px;
    transition: background-color 0.2s ease, border-color 0.2s ease;
}
.pte-word-bank-container.drag-over-bank { /* For HTML5 D&D */
    background-color: var(--correct-bg-color);
    border-color: var(--correct-border-color);
}

.pte-word-bank-title {
    margin-top: 0;
    margin-bottom: 0.625rem;
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-color);
    transition: color 0.3s ease;
}
.pte-word-bank-word {
    padding: 0.375rem 0.75rem;
    margin: 0.25rem;
    border: 1px solid var(--input-border-color);
    border-radius: 4px;
    background-color: var(--pte-word-bank-word-bg);
    color: var(--text-color-strong);
    font-size: 0.9rem;
    cursor: pointer; /* Changed from grab to pointer for tap interaction */
    transition: background-color 0.2s ease, border-color 0.2s ease, opacity 0.2s ease, color 0.3s ease;
    user-select: none;
}
.pte-word-bank-word.draggable { /* If draggable is true via JS for desktop */
    cursor: grab;
}
.pte-word-bank-word:hover:not(.used-word):not(:disabled) {
    background-color: var(--button-secondary-hover-bg-color);
    border-color: var(--link-color);
}
.pte-word-bank-word.used-word,
.pte-word-bank-word:disabled {
    background-color: var(--pte-word-bank-used-bg);
    border-color: var(--pte-word-bank-used-border);
    color: var(--pte-word-bank-used-text);
    cursor: not-allowed;
    opacity: 0.6;
}

.pte-word-bank-word.dragging,
.pte-rfib-blank-button.dragging { /* HTML5 D&D dragging visual */
    opacity: var(--dragging-opacity) !important;
    border-style: dashed !important;
    border-width: 2px !important;
    box-shadow: 0 2px 4px rgba(0,0,0,0.2) !important;
    z-index: 1005 !important;
}
.dark-mode .pte-word-bank-word.dragging,
.dark-mode .pte-rfib-blank-button.dragging {
    box-shadow: 0 2px 4px rgba(0,0,0,0.5) !important;
}

.pte-feedback-span {
    margin-left: 0.375rem;
    font-size: 0.9rem;
    vertical-align: middle;
    color: var(--text-color);
}


/* Submission Controls */
#submission-controls {
    margin-bottom: 1.25rem;
    text-align: center;
    padding-top: 1rem;
    padding-bottom: 1rem;
    border-top: 1px solid var(--input-border-color);
    border-bottom: 1px solid var(--input-border-color);
    transition: border-color 0.3s ease;
}

#submission-controls button,
.individual-submit-btn {
    padding: 0.625rem 1.375rem;
    font-size: 1rem;
    font-weight: 600;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    transition: background-color 0.2s ease-in-out, transform 0.1s ease, color 0.3s ease;
}

#submission-controls button:hover:not(:disabled),
.individual-submit-btn:hover:not(:disabled) {
    filter: brightness(95%);
}
.dark-mode #submission-controls button:hover:not(:disabled),
.dark-mode .individual-submit-btn:hover:not(:disabled) {
    filter: brightness(115%);
}


#submission-controls button:active:not(:disabled),
.individual-submit-btn:active:not(:disabled) {
    transform: translateY(1px);
    filter: brightness(90%);
}
.dark-mode #submission-controls button:active:not(:disabled),
.dark-mode .individual-submit-btn:active:not(:disabled) {
    filter: brightness(130%);
}


.individual-submit-btn {
    background-color: var(--button-primary-bg-color);
    color: var(--button-primary-text-color);
    display: block;
    margin: 1rem auto 0 auto;
    min-width: 120px;
}
.individual-submit-btn:disabled {
    background-color: var(--disabled-bg-color);
    color: var(--disabled-text-color);
    cursor: not-allowed;
}

.submission-result-feedback {
    margin-top: 0.75rem;
    padding: 0.5rem;
    font-weight: bold;
    text-align: center;
    color: var(--text-color-strong);
    background-color: var(--bg-color);
    border: 1px solid var(--input-border-color);
    border-radius: 4px;
    transition: background-color 0.3s ease, border-color 0.3s ease, color 0.3s ease;
}


#reset-btn {
    background-color: var(--button-secondary-bg-color);
    color: var(--button-secondary-text-color);
    border: 1px solid var(--button-secondary-border-color);
}
#reset-btn:disabled {
    background-color: var(--disabled-bg-color);
    color: var(--disabled-text-color);
    cursor: not-allowed;
    border-color: var(--disabled-border-color);
}

/* Navigation Wrapper */
#question-navigation-wrapper {
    margin-top: 0;
    padding-top: 0;
}

.rwfib-navigation {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
    gap: 0.625rem;
}

.rwfib-id-navigation {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 0.625rem;
}
.rwfib-id-navigation:last-child { margin-bottom: 0; }


.rwfib-navigation span {
    font-size: 0.95rem;
    color: var(--text-color-light);
    white-space: nowrap;
    transition: color 0.3s ease;
}

.rwfib-id-navigation label {
    font-size: 0.9rem;
    color: var(--text-color-light);
    margin-right: 0.3125rem;
    transition: color 0.3s ease;
}


.rwfib-navigation button,
.rwfib-id-navigation button {
    padding: 0.5rem 0.9375rem;
    font-size: 0.9rem;
    font-weight: 600;
    border: 1px solid var(--button-secondary-border-color);
    border-radius: 6px;
    cursor: pointer;
    background-color: var(--button-secondary-bg-color);
    color: var(--button-secondary-text-color);
    transition: background-color 0.2s ease-in-out, transform 0.1s ease, color 0.3s ease, border-color 0.3s ease;
}

.rwfib-navigation button:hover:not(:disabled),
.rwfib-id-navigation button:hover:not(:disabled) {
    background-color: var(--button-secondary-hover-bg-color);
}
.rwfib-navigation button:active:not(:disabled),
.rwfib-id-navigation button:active:not(:disabled) {
    transform: translateY(1px);
}

.rwfib-navigation button:disabled,
.rwfib-id-navigation button:disabled {
    background-color: var(--disabled-bg-color);
    color: var(--disabled-text-color);
    cursor: not-allowed;
    border-color: var(--disabled-border-color);
}

#question-id-input {
    width: 70px;
    padding: 0.5rem;
    border-radius: 6px;
    border: 1px solid var(--input-border-color);
    text-align: center;
    font-size: 0.9rem;
    background-color: var(--input-bg-color);
    color: var(--text-color-strong);
    -moz-appearance: textfield;
    transition: background-color 0.3s ease, border-color 0.3s ease, color 0.3s ease;
}
#question-id-input::-webkit-outer-spin-button,
#question-id-input::-webkit-inner-spin-button {
  -webkit-appearance: none;
  margin: 0;
}

#question-id-input:disabled {
    background-color: var(--disabled-bg-color);
    border-color: var(--disabled-border-color);
    color: var(--disabled-text-color);
    cursor: not-allowed;
}


/* Responsive adjustments */
@media (max-width: 700px) {
    body { padding: 0.625rem; }
    #app-container { padding: 1.25rem 0.9375rem; }
    .app-header {
        margin: -1.25rem -0.9375rem 1rem -0.9375rem;
        padding: 0.75rem 0.9375rem;
    }
    .header-top-row h1 { font-size: 1.6rem; }
    #mode-switcher-container {
        flex-direction: column;
        gap: 0.3125rem;
    }
    .mode-btn {
        width: 100%;
        box-sizing: border-box;
    }

    #category-navigation-bar-wrapper {
        margin-bottom: 0.625rem;
        padding: 0.375rem 0;
    }
    #category-navigation-bar {
        gap: 0.375rem;
        padding: 0 0.3125rem;
    }
    .category-nav-btn {
        padding: 0.4375rem 0.625rem;
        font-size: 0.85rem;
    }
    .category-nav-arrow {
        padding: 0.4375rem 0.5rem;
        font-size: 0.9rem;
        margin: 0 0.1875rem;
    }


    #hamburger-btn {
        top: 15px;
        right: 15px;
    }

    #side-menu-panel {
        width: 250px;
        right: -295px; /* Adjusted from -270px */
        padding-top: 0.9375rem;
    }
     #side-menu-panel h2 {
        font-size: 1.3rem;
        margin-bottom: 0.5rem;
        padding-bottom: 0.5rem;
    }
     #side-menu-list li a {
        font-size: 0.9rem;
        padding: 0.5rem 0.3125rem;
    }

    #settings-controls {
        align-items: stretch;
        gap: 0.75rem;
        padding: 0.625rem;
        margin-top: 1.25rem;
    }
    .setting-item {
        flex-direction: column;
        align-items: flex-start;
        gap: 0.3rem;
    }
    #questions-per-page-select, .text-size-controls {
        width: 100%;
    }
    .text-size-controls {
        justify-content: space-around;
    }


    #question-title-main { font-size: 1.2rem; }
    .rwfib-question-item-title { font-size: 1.0rem; }
    .rwfib-question-item-categories { font-size: 0.75rem; }

    /* RWFIB Responsive */
    .rwfib-question-item-prompt {
        font-size: 1rem;
        line-height: 2.3;
    }
    .rwfib-select {
        display: inline-block;
        width: auto;
        margin: 0.375rem 0.1875rem;
    }
    .rwfib-feedback-span {
        display: inline-block;
        margin-left: 0.1875rem;
        margin-top: 0.25rem;
    }

    /* PTE RFIB Responsive */
    .pte-rfib-question-item-prompt {
        font-size: 1rem;
        line-height: 2.5;
    }
    .pte-rfib-blank-button {
        padding: 0.3125rem 0.375rem;
        margin: 0.25rem 0.125rem;
        font-size: 0.9rem;
        min-width: 50px;
    }
    .pte-word-bank-word {
        display: inline-block;
        margin: 0.1875rem;
        padding: 0.3125rem 0.625rem;
    }


    .rwfib-navigation, .rwfib-id-navigation {
        flex-direction: column;
        align-items: stretch;
        gap: 0.5rem;
    }
    .rwfib-navigation button,
    .rwfib-id-navigation button,
    #question-id-input {
        width: 100%;
        box-sizing: border-box;
    }
    .rwfib-navigation span, .rwfib-id-navigation label {
        text-align: center;
        margin-bottom: 0.3125rem;
    }
    #question-id-input { margin-bottom: 0.3125rem; }

    #submission-controls {
        text-align: center;
        padding: 0.625rem 0;
    }
    #submission-controls button {
        width: auto;
        min-width: 150px;
        margin: 0.5rem 0.3125rem;
        padding: 0.75rem 0.9375rem;
    }
    .individual-submit-btn {
        width: calc(100% - 20px);
        margin-left: 10px;
        margin-right: 10px;
    }
}