/* Study View - Pre-test screen and study functionality */

/* Section badge on pre-test question cards */
.question-section-badge {
    display: inline-block;
    flex-shrink: 0;
    font-size: var(--font-size-xs);
    color: #888;
    font-style: italic;
    background: rgba(255, 255, 255, 0.06);
    border: 1px solid var(--color-border);
    border-radius: 4px;
    padding: 1px 6px;
    letter-spacing: 0.02em;
}

/* Confirmation modal shared styles */
.confirm-modal-message {
    color: var(--color-secondary);
    font-size: var(--font-size-md);
    line-height: 1.6;
    margin-bottom: var(--spacing-lg);
}

.confirm-modal-buttons {
    display: flex;
    justify-content: flex-end;
    gap: var(--spacing-sm);
}

.delete-section-btn-row {
    flex-wrap: wrap;
    justify-content: flex-end;
}

.btn-danger {
    background-color: #c0392b;
    border: 1px solid #c0392b;
    color: #fff;
    padding: var(--spacing-sm) var(--spacing-lg);
    border-radius: var(--border-radius);
    cursor: pointer;
    font-size: var(--font-size-sm);
    transition: background-color var(--transition-speed);
}

.btn-danger:hover {
    background-color: #a93226;
}

/* ── Three-column wrapper (mirrors create-set layout) ───────────────────── */
.study-wrapper {
    display: flex;
    animation: fadeIn var(--transition-speed);
    min-height: calc(100vh - var(--navbar-height));
    margin-left: 230px;  /* left sidebar width */
    margin-right: 270px; /* right sidebar width */
}

.study-left-sidebar {
    display: flex;
    flex-direction: column;
    width: 230px;
    height: calc(100vh - var(--navbar-height));
    position: fixed;
    top: var(--navbar-height);
    left: 0;
    border-right: 1px solid var(--color-secondary);
    background: var(--color-primary);
    z-index: 5;
    overflow-y: auto;
}

.study-right-sidebar {
    display: flex;
    flex-direction: column;
    width: 270px;
    height: calc(100vh - var(--navbar-height));
    position: fixed;
    top: var(--navbar-height);
    right: 0;
    border-left: 1px solid var(--color-secondary);
    background: var(--color-primary);
    z-index: 5;
}

.study-sidebar-header {
    background: var(--color-primary);
    padding: var(--spacing-md);
    border-bottom: 1px solid var(--color-border);
    text-align: center;
    flex-shrink: 0;
}

.study-sidebar-title {
    font-size: var(--font-size-md);
    font-weight: 600;
    color: var(--color-secondary);
    margin: 0;
}

.study-sidebar-content {
    flex: 1;
    overflow-y: auto;
    padding: var(--spacing-md);
    scrollbar-width: thin;
    scrollbar-color: var(--color-border) transparent;
}

.study-sidebar-content::-webkit-scrollbar { width: 6px; }
.study-sidebar-content::-webkit-scrollbar-track { background: transparent; }
.study-sidebar-content::-webkit-scrollbar-thumb {
    background-color: var(--color-border);
    border-radius: 3px;
}
.study-sidebar-content::-webkit-scrollbar-thumb:hover {
    background-color: var(--color-secondary);
}

/* Left sidebar — remove inner top margin from first items */
.study-sidebar-content .thresholds-subsection {
    margin-top: 0;
    padding-top: 0;
    border-top: none;
}

.study-sidebar-content .set-performance-section {
    margin-top: var(--spacing-md);
    padding: var(--spacing-sm) var(--spacing-sm) var(--spacing-sm);
}

/* Tighten performance metrics inside narrow sidebar */
.study-sidebar-content .set-performance-container {
    grid-template-columns: 1fr;
}

.study-sidebar-content .study-time-container {
    grid-template-columns: 1fr;
}

.study-sidebar-content .performance-button-container {
    flex-direction: column;
    align-items: stretch;
    gap: var(--spacing-xs);
    margin-top: var(--spacing-xs);
}

/* Right sidebar — remove extra padding from exam-date-section */
.study-sidebar-content .exam-date-section {
    border: none;
    padding: 0;
    margin-bottom: 0;
    background: none;
}

/* Recent performance modal */
.recent-performance-modal-content {
    width: min(640px, 94vw);
    max-height: 80vh;
    overflow-y: auto;
}

.study-container {
    animation: fadeIn var(--transition-speed);
    max-width: 900px;
    margin: 0 auto;
    padding: var(--spacing-lg);
    flex: 1;
    min-width: 0;
}

/* Set Information Section */
.set-info-section {
    margin-bottom: var(--spacing-xl);
}

.general-info-heading {
    font-size: var(--font-size-xl);
    font-weight: 600;
    color: var(--color-secondary);
    margin-bottom: var(--spacing-md);
    padding-bottom: var(--spacing-xs);
    border-bottom: 2px solid var(--color-border);
}

.study-set-title {
    font-size: var(--font-size-xxl);
    font-weight: normal;
    color: var(--color-secondary);
    margin-bottom: var(--spacing-md);
    line-height: 1.2;
}

.set-metadata {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.set-creator {
    font-size: var(--font-size-md);
    color: #999999;
    margin: 0;
}

.set-creator--link {
    background: none;
    border: none;
    padding: 0;
    cursor: pointer;
    text-align: left;
}

.set-creator--link:hover {
    color: var(--color-secondary);
    text-decoration: underline;
}

.set-question-count {
    font-size: var(--font-size-md);
    color: #999999;
    font-weight: normal;
    margin: 0;
}

.set-description-heading {
    font-size: var(--font-size-md);
    font-weight: 600;
    color: var(--color-secondary);
    margin: var(--spacing-md) 0 var(--spacing-xs) 0;
}

.set-description {
    font-size: var(--font-size-md);
    color: #cccccc;
    line-height: 1.5;
    margin: 0 0 var(--spacing-sm) 0;
}

.set-rating {
    font-size: var(--font-size-md);
    color: #ffd700;
    font-weight: 600;
    margin: 0;
}

/* Filter Section */
.filter-section {
    margin-top: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
}

.filter-section-title {
    font-size: var(--font-size-xl);
    font-weight: 600;
    color: var(--color-secondary);
    margin-bottom: var(--spacing-md);
    padding-bottom: var(--spacing-xs);
    border-bottom: 2px solid var(--color-border);
}

/* Definitions Section */
.definitions-section {
    margin-top: var(--spacing-lg);
}

.definitions-title-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-lg);
    padding-bottom: var(--spacing-sm);
    border-bottom: 2px solid var(--color-border);
}

.definitions-title {
    font-size: var(--font-size-xl);
    font-weight: 600;
    color: var(--color-secondary);
    margin: 0;
}

.sort-filter-container {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.sort-filter-label {
    font-size: var(--font-size-sm);
    color: var(--color-secondary);
    margin: 0;
}

.sort-filter-select {
    padding: var(--spacing-xs) var(--spacing-sm);
    background-color: var(--color-primary);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius);
    color: var(--color-secondary);
    font-size: var(--font-size-sm);
    cursor: pointer;
}

.sort-filter-select:focus {
    outline: none;
    border-color: var(--color-secondary);
}

/* Filter Controls */
.filter-controls {
    margin-bottom: var(--spacing-lg);
    background-color: var(--color-active);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius);
    /* overflow must NOT be hidden — the star-color dropdown must escape the container */
    position: relative;
}

/* Top Row Layout */
.filter-top-row {
    display: flex;
    align-items: center;
    gap: var(--spacing-lg);
    padding: var(--spacing-md);
    justify-content: space-between;
}

.filter-second-row {
    margin-top: var(--spacing-sm);
    padding-top: var(--spacing-sm);
    border-top: 1px solid var(--color-border);
}

/* Show More Options Button */
.show-more-container {
    display: flex;
    align-items: center;
}

.filter-show-more-row {
    display: flex;
    justify-content: center;
    padding: var(--spacing-sm) 0 0;
}

/* Show More / Expandable — kept for any legacy references, hidden by default */
.show-more-button { display: none; }
.show-more-arrow  { display: none; }
.expandable-options { display: none; }

/* ── Set Settings modal ──────────────────────────────────────────────── */
.set-settings-modal {
    width: min(520px, 96vw);
    max-height: 82vh;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    padding: var(--spacing-md) var(--spacing-lg);
}

.set-settings-modal .modal-title {
    font-size: var(--font-size-md);
    font-weight: 600;
    margin-bottom: var(--spacing-md);
    flex-shrink: 0;
}

.set-settings-panel {
    flex: 1;
    overflow-y: auto;
    padding-right: var(--spacing-xs);
}

.set-settings-modal .modal-buttons {
    flex-shrink: 0;
    margin-top: var(--spacing-md);
    padding-top: var(--spacing-sm);
    border-top: 1px solid rgba(255,255,255,0.1);
}

.filter-group {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.filter-label {
    font-size: var(--font-size-sm);
    font-weight: 600;
    color: var(--color-secondary);
    margin: 0;
}

.filter-select {
    padding: var(--spacing-xs) var(--spacing-sm);
    background-color: var(--color-primary);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius);
    color: var(--color-secondary);
    font-size: var(--font-size-sm);
    cursor: pointer;
}

.filter-select:focus {
    outline: none;
    border-color: var(--color-secondary);
}

/* Custom Dropdown */
.custom-dropdown-container {
    position: relative;
    display: inline-block;
}

.custom-dropdown-button {
    padding: var(--spacing-xs) var(--spacing-sm);
    background-color: var(--color-primary);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius);
    color: var(--color-secondary);
    font-size: var(--font-size-sm);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: space-between;
    min-width: 200px;
    transition: border-color 0.2s ease;
}

.custom-dropdown-button:hover {
    border-color: var(--color-secondary);
}

.custom-dropdown-button:focus {
    outline: none;
    border-color: var(--color-secondary);
}

.dropdown-arrow {
    margin-left: var(--spacing-xs);
    font-size: 10px;
    color: #999;
}

.custom-dropdown-menu {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--color-primary);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
    z-index: 1000;
    max-height: 200px;
    overflow-y: auto;
}

.dropdown-checkbox-label {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-xs) var(--spacing-sm);
    cursor: pointer;
    transition: background-color 0.2s ease;
    border: none;
    margin: 0;
}

.dropdown-checkbox-label:hover {
    background-color: var(--color-active);
}

.dropdown-checkbox {
    margin: 0;
    flex-shrink: 0;
}

.dropdown-color-swatch {
    width: 14px;
    height: 14px;
    border-radius: 50%;
    border: 1px solid rgba(255, 255, 255, 0.2);
    flex-shrink: 0;
}

.dropdown-color-name {
    font-size: var(--font-size-sm);
    color: var(--color-secondary);
}

/* Vertical Divider */

/* Checkbox Section */
.checkbox-section {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.checkbox-section-title {
    font-size: var(--font-size-sm);
    font-weight: 600;
    color: var(--color-secondary);
    margin: 0;
    text-align: center;
}

.checkbox-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-md);
    align-items: start;
    padding: var(--spacing-sm);
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--border-radius);
}

/* Timer section styles */
.timer-section {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
    grid-column: 1 / -1; /* Full width in checkbox grid */
    padding: var(--spacing-xs);
    background: rgba(255, 255, 255, 0.05);
    border-radius: var(--border-radius);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.global-timer-input-container {
    margin-top: var(--spacing-sm);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.timer-input-label {
    color: var(--text-color);
    font-size: var(--font-size-sm);
    font-weight: 500;
    min-width: 120px;
}

.global-timer-input {
    background: var(--bg-color);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    color: var(--text-color);
    padding: var(--spacing-xs) var(--spacing-sm);
    font-size: var(--font-size-sm);
    font-family: monospace;
    width: 80px;
    text-align: center;
}

.global-timer-input:focus {
    outline: none;
    border-color: var(--text-color);
}

.global-timer-input.invalid-time {
    border-color: #ff4444;
    background: rgba(255, 68, 68, 0.1);
}

.auto-submit-section {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
    grid-column: 1 / -1;
    padding: var(--spacing-xs);
    background: rgba(255, 255, 255, 0.05);
    border-radius: var(--border-radius);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.auto-submit-delay-container {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.auto-submit-delay-input {
    background: var(--bg-color);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    color: var(--text-color);
    padding: var(--spacing-xs) var(--spacing-sm);
    font-size: var(--font-size-sm);
    font-family: monospace;
    width: 60px;
    text-align: center;
}

.auto-submit-delay-input:focus {
    outline: none;
    border-color: var(--text-color);
}

.auto-submit-delay-input::-webkit-inner-spin-button,
.auto-submit-delay-input::-webkit-outer-spin-button {
    opacity: 1;
}

/* Checkbox Styles */
.checkbox-filter-label {
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-xs);
    cursor: pointer;
    margin: 0;
    padding: var(--spacing-xs);
    border-radius: var(--border-radius);
    transition: background-color 0.2s ease;
    white-space: normal;
}

.checkbox-filter-label:hover {
    background-color: rgba(255, 255, 255, 0.05);
}

/* Filter Checkbox Styles (matching create-set checkboxes) */
.timer-checkbox,
.auto-submit-checkbox,
.hints-checkbox,
.progress-checkbox,
.shuffle-checkbox,
.prompt-checkbox,
.breaks-checkbox {
    width: 18px;
    height: 18px;
    cursor: pointer;
    accent-color: var(--color-secondary);
    margin: 0;
}

.checkbox-text {
    font-size: var(--font-size-sm);
    color: var(--color-secondary);
    user-select: none;
    cursor: pointer;
}

/* Study Button */
.study-button-row {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-md) var(--spacing-md);
}

.btn-study {
    background-color: var(--color-secondary);
    color: var(--color-primary);
    border: 1px solid var(--color-secondary);
    padding: var(--spacing-sm) var(--spacing-lg);
    border-radius: var(--border-radius);
    font-size: var(--font-size-md);
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-speed);
}

.btn-study:hover {
    background-color: transparent;
    color: var(--color-secondary);
    border-color: var(--color-secondary);
}

.btn-study:focus {
    outline: none;
    box-shadow: 0 0 0 2px rgba(255, 255, 255, 0.3);
}

.btn-set-settings {
    padding: var(--spacing-sm) var(--spacing-lg);
    font-size: var(--font-size-md);
    font-weight: 600;
}

/* ── Return to Top ───────────────────────────────────────────────────── */
.btn-return-to-top {
    position: fixed;
    bottom: 32px;
    right: 290px;
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--color-secondary);
    color: var(--color-primary);
    border: 1px solid var(--color-secondary);
    border-radius: var(--border-radius);
    font-size: var(--font-size-sm);
    font-weight: 600;
    cursor: pointer;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.25s ease, background 0.15s, color 0.15s;
    z-index: 50;
}

.btn-return-to-top--visible {
    opacity: 1;
    pointer-events: auto;
}

.btn-return-to-top:hover {
    background: transparent;
    color: var(--color-secondary);
}


.definitions-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

.definition-item {
    background-color: var(--color-active);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius);
    padding: var(--spacing-lg);
    position: relative;
}

/* Question Section */
.question-section {
    display: flex;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-md);
    padding-bottom: var(--spacing-md);
    border-bottom: 1px solid var(--color-border);
}

.question-number {
    font-size: var(--font-size-lg);
    font-weight: 700;
    color: var(--color-secondary);
    flex-shrink: 0;
    min-width: 30px;
}

.question-text {
    font-size: var(--font-size-lg);
    color: var(--color-secondary);
    line-height: 1.4;
    flex: 1;
}

/* Answers Section */
.answers-section {
    margin-top: var(--spacing-md);
}

.answers-title {
    font-size: var(--font-size-md);
    font-weight: 600;
    color: #cccccc;
    margin-bottom: var(--spacing-sm);
}

.correct-answers-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.correct-answer-item {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
    padding: var(--spacing-sm);
    background-color: rgba(76, 175, 80, 0.1);
    border: 1px solid rgba(76, 175, 80, 0.3);
    border-radius: var(--border-radius);
}

.answer-letter {
    font-size: var(--font-size-sm);
    font-weight: 700;
    color: #4CAF50;
    background-color: rgba(76, 175, 80, 0.2);
    padding: 2px 8px;
    border-radius: var(--border-radius);
    display: inline-block;
    width: fit-content;
    margin-right: var(--spacing-sm);
}

.answer-text {
    font-size: var(--font-size-md);
    color: var(--color-secondary);
    line-height: 1.4;
}

.answer-justification {
    font-size: var(--font-size-sm);
    color: #999999;
    font-style: italic;
    margin-top: var(--spacing-xs);
    padding: var(--spacing-xs) var(--spacing-sm);
    background-color: rgba(255, 255, 255, 0.05);
    border-radius: var(--border-radius);
}

/* Empty States */
.empty-definitions {
    text-align: center;
    padding: var(--spacing-xl);
    color: #999999;
    font-size: var(--font-size-md);
}

.no-correct-answers {
    color: #ff9800;
    font-style: italic;
    padding: var(--spacing-sm);
    background-color: rgba(255, 152, 0, 0.1);
    border: 1px solid rgba(255, 152, 0, 0.3);
    border-radius: var(--border-radius);
}

/* Question Star Highlighting */
/* Question Header Layout */
.question-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-sm);
    flex-wrap: wrap;
}

.question-header-divider {
    height: 1px;
    background-color: var(--color-border);
    margin: var(--spacing-sm) 0;
    opacity: 0.5;
}

.question-star-container {
    display: flex;
    align-items: center;
    margin-left: auto; /* Push star to the right */
}

.question-star {
    font-size: 20px;
    color: #666;
    cursor: pointer;
    transition: color 0.2s ease, transform 0.2s ease;
    user-select: none;
    display: block;
    width: 24px;
    height: 24px;
    text-align: center;
    line-height: 24px;
}

.question-star:hover {
    transform: scale(1.1);
    color: #999;
}

.question-star.highlighted {
    transform: scale(1.1);
}

/* Color Menu */
.color-menu {
    background: var(--color-primary);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
    padding: var(--spacing-sm);
    min-width: 140px;
}

.color-option {
    padding: var(--spacing-xs) var(--spacing-sm);
    cursor: pointer;
    border-radius: var(--border-radius);
    transition: background-color 0.2s ease;
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    color: var(--color-secondary);
    font-size: var(--font-size-sm);
}

.color-option:hover {
    background-color: var(--color-active);
}

.color-option.clear-option {
    border-bottom: 1px solid var(--color-border);
    margin-bottom: var(--spacing-xs);
    padding-bottom: var(--spacing-sm);
    color: #ff4444;
}

.color-swatch {
    width: 16px;
    height: 16px;
    border-radius: 50%;
    border: 1px solid rgba(255, 255, 255, 0.2);
    flex-shrink: 0;
}

.color-name {
    font-weight: 500;
}

/* Question section adjustments for star */
.question-section {
    margin-right: 0; /* Reset margin since header is now above */
}


/* Question Performance Styles */
.question-performance-container {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    background: rgba(0, 0, 0, 0.5);
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--border-radius);
    border: 1px solid var(--color-border);
}

.performance-label {
    color: var(--color-secondary);
    font-size: var(--font-size-xs);
    white-space: nowrap;
}

.performance-correct {
    color: #4CAF50;
    font-size: var(--font-size-xs);
    font-weight: 600;
    white-space: nowrap;
}

.performance-incorrect {
    color: #ff4444;
    font-size: var(--font-size-xs);
    font-weight: 600;
    white-space: nowrap;
}

.performance-accuracy {
    color: #ffd700;
    font-size: var(--font-size-xs);
    font-weight: 600;
    white-space: nowrap;
    background: rgba(255, 215, 0, 0.1);
    padding: 2px var(--spacing-xs);
    border-radius: 3px;
}

/* Set Performance Section */
.set-performance-section {
    margin-top: var(--spacing-lg);
    padding: var(--spacing-lg);
    background: rgba(255, 255, 255, 0.02);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius);
}

.set-performance-title-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-md);
    flex-wrap: wrap;
    gap: var(--spacing-sm);
}

.set-performance-title {
    color: var(--color-secondary);
    font-size: var(--font-size-lg);
    margin: 0;
    font-weight: 600;
}

.btn-reset-performance {
    background: none;
    border: 1px solid #ff4444;
    color: #ff4444;
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--border-radius);
    font-size: var(--font-size-sm);
    cursor: pointer;
    transition: all var(--transition-speed);
    white-space: nowrap;
}

.btn-reset-performance:hover {
    background-color: rgba(255, 68, 68, 0.1);
    border-color: #ff6666;
    color: #ff6666;
}

.set-performance-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-md);
}

/* Performance Button Container */
.performance-button-container {
    display: flex;
    gap: var(--spacing-sm);
    align-items: center;
}

.btn-show-recent {
    background: none;
    border: 1px solid var(--color-border);
    color: var(--color-secondary);
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--border-radius);
    cursor: pointer;
    font-size: var(--font-size-sm);
    transition: all 0.2s ease;
    white-space: nowrap;
}

.btn-show-recent:hover {
    background-color: rgba(255, 255, 255, 0.1);
    border-color: var(--color-secondary);
}

/* Recent Performance Section */
.recent-performance-section {
    margin-top: var(--spacing-md);
    max-height: 0;
    overflow: hidden;
    opacity: 0;
    transition: all 0.3s ease-out;
}

.recent-performance-section.expanded {
    max-height: 600px;
    opacity: 1;
    padding-top: var(--spacing-md);
    border-top: 1px solid var(--color-border);
}

.recent-performance-title {
    font-size: var(--font-size-md);
    font-weight: 600;
    color: var(--color-secondary);
    margin: 0 0 var(--spacing-md) 0;
    text-align: center;
}

.recent-performance-list {
    background: rgba(255, 255, 255, 0.02);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius);
    overflow: hidden;
}

.performance-row {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr 1fr;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.performance-row:last-child {
    border-bottom: none;
}

.performance-header {
    background: rgba(255, 255, 255, 0.1);
    font-weight: 600;
}

.performance-cell {
    color: var(--color-secondary);
    font-size: var(--font-size-sm);
    text-align: center;
    display: flex;
    align-items: center;
    justify-content: center;
}

.performance-cell.header-cell {
    font-weight: 600;
    color: var(--color-secondary);
}

.performance-cell.correct {
    color: #4CAF50;
}

.performance-cell.incorrect {
    color: #f44336;
}

.performance-cell.accuracy {
    color: #2196F3;
    font-weight: 600;
}

.empty-recent-performance {
    padding: var(--spacing-lg);
    text-align: center;
    color: #999;
    font-style: italic;
}

.set-performance-metric {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-sm) var(--spacing-md);
    background: rgba(0, 0, 0, 0.3);
    border-radius: var(--border-radius);
    border: 1px solid var(--color-border);
}

.set-performance-metric.metric-stacked {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--spacing-xs);
}

.study-time-section {
    margin-top: var(--spacing-lg);
    padding-top: var(--spacing-md);
    border-top: 1px solid var(--color-border);
}

.study-time-title {
    color: var(--color-secondary);
    font-size: var(--font-size-md);
    font-weight: 600;
    margin: 0 0 var(--spacing-sm) 0;
}

.study-time-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-sm);
}

.study-time-total {
    border-color: var(--color-secondary);
}

.study-time-total .metric-value {
    font-size: var(--font-size-md);
}

.metric-label {
    color: var(--color-secondary);
    font-size: var(--font-size-sm);
    font-weight: 500;
}

.metric-value {
    color: var(--color-secondary);
    font-size: var(--font-size-sm);
    font-weight: 600;
}

.metric-value.correct {
    color: #4CAF50;
}

.metric-value.incorrect {
    color: #ff4444;
}

.metric-value.accuracy {
    color: #ffd700;
    background: rgba(255, 215, 0, 0.1);
    padding: 2px var(--spacing-xs);
    border-radius: 3px;
}

.metric-value.streak-best {
    color: #ffc107;
    font-weight: 700;
}

.metric-value.times-through {
    color: #a78bfa;
    font-weight: 600;
}


/* Medium screens */
@media (max-width: 1024px) and (min-width: 769px) {
    .filter-top-row {
        flex-wrap: wrap;
        gap: var(--spacing-md);
    }
    
    .checkbox-container {
        grid-template-columns: 1fr 1fr;
    }
}

/* Responsive Design */
@media (max-width: 900px) {
    .study-wrapper {
        margin-left: 0;
        margin-right: 0;
    }

    .study-left-sidebar,
    .study-right-sidebar {
        display: none;
    }
}

@media (max-width: 768px) {
    .study-container {
        padding: var(--spacing-md);
    }
    
    .study-set-title {
        font-size: var(--font-size-xl);
    }
    
    .question-section {
        flex-direction: column;
        gap: var(--spacing-sm);
    }
    
    .question-number {
        min-width: auto;
    }
    
    .set-metadata {
        gap: var(--spacing-xs);
    }
    
    .question-section {
        margin-right: 0; /* Reset for mobile since header is above */
    }
    
    .question-header {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--spacing-sm);
    }
    
    .question-star-container {
        margin-left: 0;
        align-self: flex-end;
    }
    
    
    .question-performance-container {
        flex-direction: column;
        gap: 2px;
        padding: var(--spacing-xs);
    }
    
    .performance-label {
        font-size: 10px;
    }
    
    .performance-correct,
    .performance-incorrect,
    .performance-accuracy {
        font-size: 10px;
    }
    
    .set-performance-container {
        grid-template-columns: 1fr;
        gap: var(--spacing-sm);
    }
    
    .performance-button-container {
        flex-direction: column;
        align-items: stretch;
        gap: var(--spacing-xs);
    }
    
    .performance-row {
        grid-template-columns: 1fr;
        gap: var(--spacing-xs);
        text-align: left;
    }
    
    .performance-cell {
        justify-content: flex-start;
        padding: var(--spacing-xs) 0;
    }
    
    .performance-cell.header-cell {
        display: none; /* Hide headers on mobile, use inline labels */
    }
    
    .performance-cell:before {
        content: attr(data-label) ': ';
        font-weight: 600;
        margin-right: var(--spacing-xs);
        color: var(--color-secondary);
    }
    
    .set-performance-metric {
        padding: var(--spacing-xs) var(--spacing-sm);
    }
    
    .metric-label,
    .metric-value {
        font-size: var(--font-size-xs);
    }
    
    .set-performance-title-container {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--spacing-sm);
    }
    
    .btn-reset-performance {
        align-self: flex-start;
    }
    
    
    .question-star-container {
        top: var(--spacing-sm);
        right: var(--spacing-sm);
    }
    
    .filter-top-row {
        flex-direction: column;
        gap: var(--spacing-md);
        align-items: stretch;
    }
    
    .filter-top-row > * {
        width: 100%;
    }
    
    
    .checkbox-container {
        grid-template-columns: 1fr;
        gap: var(--spacing-sm);
    }
    
    .global-timer-input-container {
        flex-direction: column;
        align-items: flex-start;
    }
    
    .timer-input-label {
        min-width: auto;
    }
    
    .study-button-row {
        padding: var(--spacing-xs) var(--spacing-md) var(--spacing-md);
    }
    
    .btn-study {
        width: 100%;
        justify-content: center;
    }
    
    .definitions-title-container {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--spacing-sm);
    }
    
    .sort-filter-container {
        align-self: flex-end;
    }
}

/* Question Limit Section */
.question-limit-section {
    margin-top: var(--spacing-lg);
    padding: var(--spacing-md);
    background: rgba(255, 255, 255, 0.05);
    border-radius: var(--border-radius);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.question-limit-container {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.question-limit-label {
    color: var(--color-secondary);
    font-size: var(--font-size-md);
    font-weight: 500;
}

.question-limit-input {
    padding: var(--spacing-sm);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius);
    background: var(--color-primary);
    color: var(--color-secondary);
    font-size: var(--font-size-md);
    width: 100px;
}

.question-limit-input:focus {
    outline: none;
    border-color: var(--color-secondary);
}

.test-timer-row {
    flex-direction: row;
    align-items: center;
    gap: var(--spacing-md);
    flex-wrap: wrap;
    margin-top: var(--spacing-sm);
}

.test-timer-input {
    width: 70px;
    text-align: center;
    letter-spacing: 0.05em;
}

/* Animation */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ── Thresholds subsection (Set Performance) ───────────────────────────── */
.thresholds-subsection {
    margin-top: var(--spacing-lg);
    padding-top: var(--spacing-lg);
    border-top: 1px solid var(--color-border);
}

.thresholds-subsection-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--spacing-md);
}

.thresholds-subsection-title {
    color: var(--color-secondary);
    font-size: var(--font-size-md);
    font-weight: 600;
    margin: 0;
}

.btn-edit-thresholds {
    background: none;
    border: 1px solid var(--color-border);
    color: var(--color-secondary);
    font-size: var(--font-size-xs);
    padding: 4px 10px;
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: background var(--transition-speed), border-color var(--transition-speed);
    white-space: nowrap;
}

.btn-edit-thresholds:hover {
    background: rgba(255,255,255,0.06);
    border-color: var(--color-secondary);
}

.threshold-boxes-row {
    display: flex;
    gap: var(--spacing-md);
    flex-wrap: wrap;
}

.threshold-box {
    flex: 1;
    min-width: 60px;
    border-radius: var(--border-radius);
    padding: var(--spacing-xs) var(--spacing-sm);
    text-align: center;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 2px;
}

.threshold-mastered {
    background: rgba(76, 175, 80, 0.12);
    border: 1px solid rgba(76, 175, 80, 0.4);
}

.threshold-needs-review {
    background: rgba(255, 193, 7, 0.12);
    border: 1px solid rgba(255, 193, 7, 0.4);
}

.threshold-must-study {
    background: rgba(244, 67, 54, 0.12);
    border: 1px solid rgba(244, 67, 54, 0.4);
}

.threshold-unstudied {
    background: rgba(136, 136, 136, 0.10);
    border: 1px solid rgba(136, 136, 136, 0.35);
}

.threshold-box-label {
    font-size: var(--font-size-sm);
    font-weight: 600;
    color: var(--color-secondary);
}

.threshold-mastered .threshold-box-label { color: #4caf50; }
.threshold-needs-review .threshold-box-label { color: #ffc107; }
.threshold-must-study .threshold-box-label { color: #f44336; }
.threshold-unstudied .threshold-box-label { color: #999; }

.threshold-box-count {
    font-size: 1.4rem;
    font-weight: 700;
    line-height: 1;
    color: var(--color-secondary);
}

.threshold-mastered .threshold-box-count { color: #4caf50; }
.threshold-needs-review .threshold-box-count { color: #ffc107; }
.threshold-must-study .threshold-box-count { color: #f44336; }
.threshold-unstudied .threshold-box-count { color: #999; }

.threshold-box-range {
    font-size: var(--font-size-xs);
    color: var(--color-muted, rgba(255,255,255,0.45));
}

/* ── Thresholds modal ───────────────────────────────────────────────────── */
/* Double-class specificity beats .modal-content from study-mode.css */
.modal-content.thresholds-modal-content {
    width: min(210px, 92vw);
    max-width: 210px;
    padding: var(--spacing-sm) var(--spacing-md);
}

.thresholds-modal-content .modal-title {
    margin-bottom: var(--spacing-sm);
    font-size: var(--font-size-md);
}

.thresholds-modal-content .modal-buttons {
    margin-top: var(--spacing-sm);
}

/* Stack label above inputs so the narrow width isn't cramped */
.thresholds-modal-content .threshold-config-row {
    flex-direction: column;
    align-items: flex-start;
    gap: 4px;
}

.thresholds-modal-content .threshold-config-label {
    min-width: unset;
}

.thresholds-config-panel {
    margin-top: var(--spacing-xs);
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.threshold-config-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--spacing-sm);
    padding: 6px var(--spacing-sm);
    border-radius: var(--border-radius);
    border: 1px solid var(--color-border);
    background: rgba(255,255,255,0.03);
}

.threshold-config-mastered {
    border-color: rgba(76, 175, 80, 0.3);
    background: rgba(76, 175, 80, 0.06);
}

.threshold-config-needs-review {
    border-color: rgba(255, 193, 7, 0.3);
    background: rgba(255, 193, 7, 0.06);
}

.threshold-config-must-study {
    border-color: rgba(244, 67, 54, 0.3);
    background: rgba(244, 67, 54, 0.06);
}

.threshold-config-label {
    font-size: var(--font-size-sm);
    font-weight: 600;
    color: var(--color-secondary);
    min-width: 90px;
}

.threshold-config-mastered .threshold-config-label { color: #4caf50; }
.threshold-config-needs-review .threshold-config-label { color: #ffc107; }
.threshold-config-must-study .threshold-config-label { color: #f44336; }

.threshold-range-inputs {
    display: flex;
    align-items: center;
    gap: 4px;
}

.threshold-range-input {
    width: 52px;
    padding: 4px 6px;
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius);
    background: var(--color-primary);
    color: var(--color-secondary);
    font-size: var(--font-size-sm);
    text-align: center;
}

.threshold-range-input:focus {
    outline: none;
    border-color: var(--color-accent, #2196f3);
}

.threshold-range-sep,
.threshold-pct-label {
    font-size: var(--font-size-sm);
    color: var(--color-secondary);
}

.threshold-validation-msg {
    font-size: var(--font-size-xs);
    color: #f44336;
    padding: var(--spacing-xs) 0;
}

/* ── Section filter – short fixed-width select ──────────────────────────── */
.filter-select--short {
    width: 140px;
    max-width: 140px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.filter-select--short option {
    white-space: normal;
    word-break: break-word;
}
/* ── Exam date section (pre-test screen) ──────────────────────────────────── */

.exam-date-section {
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius);
    padding: var(--spacing-md) var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
}

.exam-date-heading {
    font-size: var(--font-size-sm);
    font-weight: 600;
    color: var(--color-secondary);
    opacity: 0.8;
    margin: 0 0 var(--spacing-sm) 0;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.exam-date-row {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    flex-wrap: wrap;
}

.exam-date-input {
    background: rgba(255,255,255,0.05);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius);
    color: var(--color-secondary);
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: var(--font-size-sm);
    cursor: pointer;
    transition: border-color var(--transition-speed);
    color-scheme: dark;
}
.exam-date-input:focus {
    outline: none;
    border-color: var(--color-secondary);
}

.exam-date-save-btn {
    font-size: var(--font-size-sm);
    padding: var(--spacing-sm) var(--spacing-md);
}

.exam-date-clear-btn {
    font-size: var(--font-size-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    background: none;
    border: 1px solid var(--color-border);
    color: var(--color-secondary);
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: border-color var(--transition-speed);
}
.exam-date-clear-btn:hover { border-color: #e53935; color: #e53935; }

.exam-date-status {
    margin: var(--spacing-xs) 0 0 0;
    font-size: var(--font-size-xs);
    min-height: 16px;
}
.exam-date-status--saved    { color: #4CAF50; }
.exam-date-status--cleared  { color: var(--color-secondary); opacity: 0.5; }
.exam-date-status--error    { color: #e53935; }

.exam-grade-row {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    margin-top: var(--spacing-sm);
    flex-wrap: wrap;
}

.exam-grade-label {
    color: var(--color-secondary);
    font-size: var(--font-size-sm);
    white-space: nowrap;
}

.exam-grade-input {
    width: 80px;
    padding: var(--spacing-xs) var(--spacing-sm);
    background: var(--color-active);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius);
    color: var(--color-secondary);
    font-size: var(--font-size-sm);
    text-align: center;
}

.exam-grade-input:disabled {
    opacity: 0.4;
    cursor: not-allowed;
}

.exam-grade-input:focus {
    outline: none;
    border-color: var(--color-secondary);
}

.exam-grade-save-btn {
    font-size: var(--font-size-sm);
    padding: var(--spacing-sm) var(--spacing-md);
}

.exam-grade-save-btn:disabled {
    opacity: 0.4;
    cursor: not-allowed;
}

.exam-grade-hint {
    color: #666;
    font-size: var(--font-size-xs);
    font-style: italic;
}

/* ── Result-type toggle (Grade % | Pass / Fail) ─────────────────────── */
.exam-result-type-toggle {
    display: flex;
    gap: var(--spacing-xs);
    margin-top: var(--spacing-sm);
}

.exam-result-type-option {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-xs) var(--spacing-sm);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius);
    font-size: var(--font-size-sm);
    color: var(--color-secondary);
    cursor: pointer;
    transition: border-color var(--transition-speed), background var(--transition-speed);
    user-select: none;
}

.exam-result-type-option input[type="radio"] {
    accent-color: var(--color-secondary);
    cursor: pointer;
}

.exam-result-type-option:has(input:checked) {
    border-color: var(--color-secondary);
    background: rgba(255, 255, 255, 0.07);
}

/* ── Pass/Fail select ───────────────────────────────────────────────── */
.exam-passfail-row {
    margin-top: var(--spacing-sm);
}

.exam-passfail-select {
    width: 100%;
    padding: var(--spacing-xs) var(--spacing-sm);
    background: var(--color-active);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius);
    color: var(--color-secondary);
    font-size: var(--font-size-sm);
    cursor: pointer;
    color-scheme: dark;
}

.exam-passfail-select:focus {
    outline: none;
    border-color: var(--color-secondary);
}

/* ── Action buttons row ─────────────────────────────────────────────── */
.exam-date-actions-row {
    display: flex;
    gap: var(--spacing-sm);
    margin-top: var(--spacing-sm);
}

.exam-date-actions-row .exam-date-save-btn {
    flex: 1;
    font-size: var(--font-size-sm);
    padding: var(--spacing-sm) var(--spacing-md);
}

.exam-date-actions-row .exam-date-clear-btn {
    font-size: var(--font-size-sm);
    padding: var(--spacing-sm) var(--spacing-md);
}

/* ── Performance Breakdown page ─────────────────────────────────────── */
.performance-breakdown-page {
    display: flex;
    flex-direction: column;
    height: 100%;
    padding: var(--spacing-md);
    box-sizing: border-box;
    overflow: hidden;
}

/* Full-width single-column body (no sidebar on breakdown page) */
.performance-breakdown-body.pb-full-width {
    flex: 1;
    overflow-y: auto;
    min-width: 0;
    padding: 0 var(--spacing-md) var(--spacing-xl);
}

/* Keep old two-col layout rule inert but harmless */
.performance-breakdown-layout {
    display: flex;
    flex: 1;
    gap: var(--spacing-lg);
    min-height: 0;
    overflow: hidden;
    align-items: stretch;
}

.performance-breakdown-layout > .study-left-sidebar {
    position: relative;
    top: auto;
    left: auto;
    max-height: calc(100vh - var(--navbar-height) - 32px);
    flex-shrink: 0;
    overflow-y: auto;
}

.performance-breakdown-layout > .study-left-sidebar .study-sidebar-content {
    overflow-y: visible;
    flex: unset;
}

.performance-breakdown-body {
    flex: 1;
    overflow-y: auto;
    padding: var(--spacing-md);
    min-width: 0;
}

/* ── Header row ──────────────────────────────────────────────────────── */
.pb-header-row {
    display: flex;
    flex-direction: row;
    align-items: baseline;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-sm);
}

.performance-breakdown-title {
    font-size: var(--font-size-xl);
    font-weight: 600;
    color: var(--color-secondary);
    margin: 0;
}

.pb-section-title {
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: var(--color-secondary);
    margin: 0 0 var(--spacing-md);
}

.pb-header-subtitle {
    font-size: var(--font-size-sm);
    color: var(--color-muted, #888);
    font-weight: 400;
}

.pb-loading {
    color: var(--color-secondary);
    padding: var(--spacing-lg);
    text-align: center;
}

/* ── Mastery summary bar ─────────────────────────────────────────────── */
.pb-summary-bar {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    flex-wrap: wrap;
    padding: var(--spacing-sm) var(--spacing-md);
    background: #242424;
    border: 1px solid rgba(255, 255, 255, 0.12);
    border-radius: var(--border-radius, 8px);
    margin-bottom: var(--spacing-md);
}

.pb-summary-pills {
    flex: 1;
    min-width: 0;
}

/* ── Key stats row ───────────────────────────────────────────────────── */
.pb-key-stats-row {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-md);
}

@media (max-width: 900px) {
    .pb-key-stats-row { grid-template-columns: repeat(2, 1fr); }
}

.pb-key-stat-card {
    display: flex;
    flex-direction: column;
    gap: 4px;
    padding: var(--spacing-md);
    background: #242424;
    border: 1px solid rgba(255, 255, 255, 0.12);
    border-radius: var(--border-radius, 8px);
}

.pb-key-stat-label {
    font-size: var(--font-size-sm);
    color: rgba(255, 255, 255, 0.55);
    text-transform: uppercase;
    letter-spacing: 0.04em;
}

.pb-key-stat-value {
    font-size: 1.8rem;
    font-weight: 700;
    line-height: 1.1;
    color: #fff;
}

.pb-key-stat-sub {
    font-size: var(--font-size-xs, 11px);
    color: rgba(255, 255, 255, 0.4);
}

.pb-stat-mastered      { color: #34d399; }
.pb-stat-needs-review  { color: #fbbf24; }
.pb-stat-must-study    { color: #ef4444; }
.pb-stat-streak        { color: #a78bfa; }
.pb-stat-streak-hot    { color: #f97316; }

/* ── Chart area ──────────────────────────────────────────────────────── */
.pb-chart-section {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-md);
    background: #242424;
    border: 1px solid rgba(255, 255, 255, 0.12);
    border-radius: var(--border-radius, 8px);
    padding: var(--spacing-md);
}

/* ── Bottom detail panels ────────────────────────────────────────────── */
.pb-bottom-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-md);
    margin-top: var(--spacing-md);
}

@media (max-width: 700px) {
    .pb-bottom-row { grid-template-columns: 1fr; }
}

.pb-detail-panel {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
    padding: var(--spacing-md);
    background: #242424;
    border: 1px solid rgba(255, 255, 255, 0.12);
    border-radius: var(--border-radius, 8px);
}

.pb-detail-panel-title {
    font-size: var(--font-size-md);
    font-weight: 600;
    color: var(--color-secondary);
    margin: 0 0 var(--spacing-xs) 0;
    padding-bottom: var(--spacing-xs);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.pb-chart-tabs {
    display: flex;
    gap: var(--spacing-xs);
    flex-wrap: wrap;
}

.pb-chart-tab {
    padding: 6px 14px;
    border-radius: 20px;
    border: 1px solid rgba(255, 255, 255, 0.35);
    background: transparent;
    color: rgba(255, 255, 255, 0.65);
    font-size: var(--font-size-sm);
    cursor: pointer;
    transition: background 0.15s, color 0.15s, border-color 0.15s;
    white-space: nowrap;
}

.pb-chart-tab:hover {
    background: rgba(255, 255, 255, 0.1);
    color: #fff;
    border-color: rgba(255, 255, 255, 0.6);
}

.pb-chart-tab--active {
    background: rgba(255, 255, 255, 0.18);
    color: #fff;
    border-color: #fff;
}

.pb-chart-controls {
    display: flex;
    align-items: center;
    justify-content: flex-end;
    gap: var(--spacing-sm);
    flex-wrap: wrap;
    padding: var(--spacing-sm) var(--spacing-md);
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.12);
    border-radius: var(--border-radius, 8px);
}

.pb-chart-controls-right {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    flex-wrap: wrap;
}

.pb-ctrl-label {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    font-size: var(--font-size-sm);
    color: rgba(255, 255, 255, 0.75);
    white-space: nowrap;
}

.pb-ctrl-select {
    font-size: var(--font-size-sm);
    padding: 4px 8px;
    border: 1px solid rgba(255, 255, 255, 0.35);
    border-radius: var(--border-radius, 8px);
    background: #2e2e2e;
    color: #fff;
    cursor: pointer;
    outline: none;
}

.pb-ctrl-select:focus {
    border-color: rgba(255, 255, 255, 0.7);
}

.pb-chart-viewport {
    overflow-x: hidden;
    overflow-y: hidden;
    border: 1px solid rgba(255, 255, 255, 0.12);
    border-radius: var(--border-radius, 8px);
    background: #1a1a1a;
    padding: var(--spacing-md) var(--spacing-md) var(--spacing-sm);
}

.pb-chart-canvas {
    display: block;
    min-width: max-content;
}

.pb-chart-error {
    color: #f87171;
    font-size: var(--font-size-sm);
    padding: var(--spacing-md);
}

/* ── Below-chart accuracy breakdown ──────────────────────────────────── */
.pb-accuracy-section {
    margin-top: var(--spacing-lg);
    padding: var(--spacing-md);
    background: #242424;
    border: 1px solid rgba(255, 255, 255, 0.12);
    border-radius: var(--border-radius, 8px);
}

.pb-accuracy-title-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--spacing-md);
    gap: var(--spacing-sm);
}

.pb-accuracy-section-title {
    font-size: var(--font-size-md);
    font-weight: 600;
    color: var(--color-secondary);
    margin: 0;
}

.pb-sort-group {
    display: flex;
    gap: 2px;
    background: rgba(0, 0, 0, 0.3);
    border: 1px solid rgba(255, 255, 255, 0.12);
    border-radius: var(--border-radius, 8px);
    padding: 2px;
}

.pb-sort-btn {
    padding: 3px 10px;
    font-size: var(--font-size-xs, 11px);
    font-weight: 500;
    color: rgba(255, 255, 255, 0.5);
    background: transparent;
    border: none;
    border-radius: calc(var(--border-radius, 8px) - 2px);
    cursor: pointer;
    transition: all var(--transition-speed);
    white-space: nowrap;
}

.pb-sort-btn:hover {
    color: var(--color-secondary);
    background: rgba(255, 255, 255, 0.06);
}

.pb-sort-btn--active {
    color: var(--color-primary);
    background: var(--color-secondary);
}

.pb-accuracy-subheading {
    font-size: var(--font-size-sm);
    font-weight: 500;
    color: rgba(255, 255, 255, 0.55);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin: var(--spacing-md) 0 var(--spacing-sm) 0;
}

.pb-accuracy-subheading:first-of-type {
    margin-top: 0;
}

.pb-accuracy-grid {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
}

.pb-accuracy-card {
    display: flex;
    flex-direction: column;
    gap: 4px;
    padding: var(--spacing-sm) var(--spacing-md);
    background: rgba(0, 0, 0, 0.3);
    border: 1px solid rgba(255, 255, 255, 0.12);
    border-radius: var(--border-radius, 8px);
    min-width: 110px;
}

.pb-accuracy-card-label {
    font-size: var(--font-size-sm);
    color: rgba(255, 255, 255, 0.65);
    white-space: nowrap;
}

.pb-accuracy-card-pct {
    font-size: 1.5rem;
    font-weight: 700;
    line-height: 1.1;
}

.pb-accuracy-card-pct--mastered    { color: #34d399; }
.pb-accuracy-card-pct--needsReview { color: #fbbf24; }
.pb-accuracy-card-pct--mustStudy   { color: #ef4444; }
.pb-accuracy-card-pct--unstudied   { color: rgba(255, 255, 255, 0.3); }

.pb-accuracy-card-counts {
    display: flex;
    gap: var(--spacing-sm);
    font-size: var(--font-size-xs, 11px);
}

.pb-acc-correct  { color: #34d399; }
.pb-acc-incorrect { color: #ef4444; }

.pb-accuracy-empty {
    font-size: var(--font-size-sm);
    color: rgba(255, 255, 255, 0.4);
}

.pb-accuracy-accordion {
    margin-top: var(--spacing-md);
    border: 1px solid rgba(255, 255, 255, 0.12);
    border-radius: var(--border-radius, 8px);
    overflow: hidden;
}

.pb-accuracy-accordion-trigger {
    width: 100%;
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    background: rgba(0, 0, 0, 0.2);
    border: none;
    color: var(--color-secondary);
    font-size: var(--font-size-sm);
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    cursor: pointer;
    text-align: left;
    transition: background var(--transition-speed);
}

.pb-accuracy-accordion-trigger:hover {
    background: rgba(255, 255, 255, 0.07);
}

.pb-accuracy-accordion-meta {
    color: rgba(255, 255, 255, 0.4);
    font-weight: 400;
    text-transform: none;
    letter-spacing: 0;
}

.pb-accuracy-accordion-chevron {
    margin-left: auto;
    font-size: 1.1rem;
    color: rgba(255, 255, 255, 0.4);
    transition: transform var(--transition-speed);
    display: inline-block;
}

.pb-accuracy-accordion-body {
    display: none;
    padding: var(--spacing-sm) var(--spacing-md) var(--spacing-md);
}

.pb-accuracy-accordion--open .pb-accuracy-accordion-body {
    display: block;
}

.pb-section-block {
    padding: var(--spacing-sm) 0 var(--spacing-md);
}

.pb-section-block--bordered {
    border-top: 1px solid rgba(255, 255, 255, 0.08);
    margin-top: var(--spacing-sm);
    padding-top: var(--spacing-md);
}

.pb-section-block-header {
    display: flex;
    align-items: baseline;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-sm);
}

.pb-section-block-title {
    font-size: var(--font-size-sm);
    font-weight: 600;
    color: var(--color-secondary);
}

.pb-section-block-acc {
    font-size: var(--font-size-sm);
    font-weight: 700;
}

.pb-section-sublabel {
    font-size: 10px;
    font-weight: 500;
    color: rgba(255, 255, 255, 0.4);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: var(--spacing-xs);
}

/* Day streak hot colour (3+ day streak) */
.day-streak-hot {
    color: #f97316;
    font-weight: 600;
}

/* ── Goals section ───────────────────────────────────────────────────── */
.pb-goals-section {
    margin-bottom: var(--spacing-md);
    padding: var(--spacing-md);
    background: #242424;
    border: 1px solid rgba(255, 255, 255, 0.12);
    border-radius: var(--border-radius, 8px);
}

.pb-goals-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--spacing-md);
}

.pb-goals-title {
    font-size: var(--font-size-md);
    font-weight: 600;
    color: var(--color-secondary);
    margin: 0;
}

.btn-add-goal {
    padding: 5px 14px;
    border: 1px solid rgba(255, 255, 255, 0.35);
    border-radius: 20px;
    background: transparent;
    color: rgba(255, 255, 255, 0.75);
    font-size: var(--font-size-sm);
    cursor: pointer;
    transition: background 0.15s, color 0.15s, border-color 0.15s;
}
.btn-add-goal:hover {
    background: rgba(255, 255, 255, 0.1);
    color: #fff;
    border-color: rgba(255, 255, 255, 0.7);
}

.pb-goals-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
    gap: var(--spacing-sm);
}

.pb-goals-empty {
    font-size: var(--font-size-sm);
    color: rgba(255, 255, 255, 0.4);
    margin: 0;
}

.pb-goal-card {
    display: flex;
    flex-direction: column;
    gap: 6px;
    padding: var(--spacing-sm) var(--spacing-md);
    background: rgba(0, 0, 0, 0.3);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--border-radius, 8px);
    transition: border-color 0.2s;
}
.pb-goal-card--met {
    border-color: rgba(52, 211, 153, 0.45);
    background: rgba(52, 211, 153, 0.06);
}

.pb-goal-top-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--spacing-xs);
}

.pb-goal-label {
    font-size: var(--font-size-sm);
    font-weight: 600;
    color: rgba(255, 255, 255, 0.9);
}

.pb-goal-top-right {
    display: flex;
    align-items: center;
    gap: 6px;
    flex-shrink: 0;
}

.pb-goal-deadline {
    font-size: 11px;
    padding: 2px 7px;
    border-radius: 10px;
    background: rgba(255, 255, 255, 0.1);
    color: rgba(255, 255, 255, 0.6);
}
.pb-goal-deadline--urgent {
    background: rgba(239, 68, 68, 0.2);
    color: #f87171;
}

.pb-goal-delete {
    background: none;
    border: none;
    color: rgba(255, 255, 255, 0.3);
    font-size: 1rem;
    line-height: 1;
    cursor: pointer;
    padding: 0 2px;
    transition: color 0.15s;
}
.pb-goal-delete:hover { color: #f87171; }

.pb-goal-target {
    font-size: 11px;
    color: rgba(255, 255, 255, 0.45);
}

.pb-goal-bar-wrap {
    height: 6px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 3px;
    overflow: hidden;
}
.pb-goal-bar-fill {
    height: 100%;
    border-radius: 3px;
    transition: width 0.4s ease;
}
.pb-goal-bar--met    { background: #34d399; }
.pb-goal-bar--ok     { background: #fbbf24; }
.pb-goal-bar--behind { background: #ef4444; }

.pb-goal-status-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--spacing-xs);
}
.pb-goal-status {
    font-size: 11px;
    color: rgba(255, 255, 255, 0.6);
}
.pb-goal-pct {
    font-size: 11px;
    font-weight: 600;
    color: rgba(255, 255, 255, 0.5);
    flex-shrink: 0;
}

/* ── Add Goal modal ──────────────────────────────────────────────────── */
.add-goal-modal {
    width: min(480px, 96vw);
    padding: var(--spacing-md) var(--spacing-lg);
}

.add-goal-type-list {
    display: flex;
    flex-direction: column;
    gap: 2px;
    margin-bottom: var(--spacing-md);
}

.add-goal-type-row {
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-sm);
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--border-radius, 8px);
    cursor: pointer;
    transition: background 0.15s;
}
.add-goal-type-row:hover { background: rgba(255, 255, 255, 0.06); }
.add-goal-type-row input[type="radio"] { margin-top: 3px; flex-shrink: 0; accent-color: var(--color-secondary); }

.add-goal-type-text {
    display: flex;
    flex-direction: column;
    gap: 2px;
}
.add-goal-type-name {
    font-size: var(--font-size-sm);
    font-weight: 600;
    color: rgba(255, 255, 255, 0.9);
}
.add-goal-type-desc {
    font-size: 11px;
    color: rgba(255, 255, 255, 0.45);
}

.add-goal-field {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-sm);
}
.add-goal-label {
    font-size: var(--font-size-sm);
    color: rgba(255, 255, 255, 0.7);
    white-space: nowrap;
    min-width: 60px;
}
.add-goal-input {
    padding: 6px 10px;
    border: 1px solid rgba(255, 255, 255, 0.25);
    border-radius: var(--border-radius, 8px);
    background: #2e2e2e;
    color: #fff;
    font-size: var(--font-size-sm);
    outline: none;
    width: 80px;
}
.add-goal-date { width: 150px; }
.add-goal-input:focus { border-color: rgba(255, 255, 255, 0.6); }
.add-goal-unit {
    font-size: var(--font-size-sm);
    color: rgba(255, 255, 255, 0.5);
}