/* ==========================================================================
   ACADEMIC DEVELOPER DOCUMENTATION - UNIFIED INTERACTIVE LEARNING ENGINE
   Soft Light Theme | High Readability | Scalable Data-Driven Components
   ========================================================================== */

:root {
    --widget-bg: #FFFFFF;
    --widget-border: #E4E7EF;
    --widget-header-bg: #F8F9FC;
    --widget-dark-bg: #0B1120;
    --widget-dark-border: #1E293B;
    --widget-output-bg: #0F172A;
    --widget-accent: #6C4CE8;
    --widget-accent-light: #F0EBFF;
    --widget-accent-hover: #5B3DD1;
    --widget-success: #10B981;
    --widget-success-light: #ECFDF5;
    --widget-danger: #EF4444;
    --widget-danger-light: #FEF2F2;
    --widget-warning: #F59E0B;
    --widget-warning-light: #FFFBEB;
    --widget-shadow: 0 4px 16px rgba(23, 32, 51, 0.04), 0 1px 3px rgba(23, 32, 51, 0.05);
}

/* ==========================================================================
   GENERIC WIDGET CONTAINER & HEADER
   ========================================================================== */
.learning-widget {
    background: var(--widget-bg);
    border: 1px solid var(--widget-border);
    border-radius: 16px;
    box-shadow: var(--widget-shadow);
    margin: 28px 0 32px;
    overflow: hidden;
    transition: box-shadow 0.25s ease, border-color 0.25s ease;
}

.learning-widget:hover {
    box-shadow: 0 8px 24px rgba(108, 76, 232, 0.08), 0 2px 6px rgba(0, 0, 0, 0.04);
}

.learning-widget-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 14px 20px;
    background: var(--widget-header-bg);
    border-bottom: 1px solid var(--widget-border);
}

.learning-widget-title {
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: 700;
    font-size: 15px;
    color: #172033;
}

.learning-widget-dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: var(--widget-accent);
    box-shadow: 0 0 0 3px var(--widget-accent-light);
}

.learning-widget-badge {
    font-size: 11.5px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    padding: 4px 10px;
    border-radius: 9999px;
    background: var(--widget-accent-light);
    color: var(--widget-accent);
    border: 1px solid rgba(108, 76, 232, 0.15);
}

.learning-widget-body {
    padding: 22px;
}

/* Common Interactive Buttons & Action Bars */
.memory-actions, .predict-actions, .editor-actions, .practice-actions {
    display: flex;
    gap: 12px;
    margin-top: 14px;
    margin-bottom: 8px;
    align-items: center;
    flex-wrap: wrap;
}

.memory-btn, .predict-submit-btn, .quiz-check-btn, .predict-check-btn, .predict-reset-btn, .quiz-reset-btn, .quiz-prev-btn, .quiz-next-btn, .run-btn, .run-button, .show-answer-btn, .answer-toggle-btn {
    height: 38px;
    min-height: 38px;
    padding: 0 18px;
    border-radius: 8px;
    font-size: 13px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s cubic-bezier(0.16, 1, 0.3, 1);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 7px;
    border: 1px solid transparent;
    line-height: 1;
    user-select: none;
    text-decoration: none;
    box-sizing: border-box;
    white-space: nowrap;
}

/* Primary Accent Buttons (Check Answer, Next Question, Run, etc.) */
.memory-btn-primary, .predict-submit-btn, .quiz-check-btn, .predict-check-btn, .quiz-next-btn, .run-btn, .run-button {
    background: var(--widget-accent);
    color: #FFFFFF;
    border-color: var(--widget-accent);
}

.memory-btn-primary:hover, .predict-submit-btn:hover, .quiz-check-btn:hover, .predict-check-btn:hover, .quiz-next-btn:hover, .run-btn:hover, .run-button:hover {
    background: var(--widget-accent-hover);
    border-color: var(--widget-accent-hover);
    box-shadow: 0 4px 14px rgba(108, 76, 232, 0.28);
    transform: translateY(-1px);
}

.memory-btn-primary:active, .predict-submit-btn:active, .quiz-check-btn:active, .predict-check-btn:active, .quiz-next-btn:active, .run-btn:active, .run-button:active {
    transform: translateY(0);
}

/* Secondary / Light Buttons (Reset, Prev, Show Answer) */
.memory-btn-secondary, .predict-reset-btn, .quiz-reset-btn, .quiz-prev-btn, .show-answer-btn, .answer-toggle-btn {
    background: #F8FAFC;
    color: #475569;
    border-color: #CBD5E1;
}

.memory-btn-secondary:hover, .predict-reset-btn:hover, .quiz-reset-btn:hover, .quiz-prev-btn:hover, .show-answer-btn:hover, .answer-toggle-btn:hover {
    background: #EDF2F7;
    color: #1E293B;
    border-color: #94A3B8;
    transform: translateY(-1px);
}

.memory-btn-secondary:active, .predict-reset-btn:active, .quiz-reset-btn:active, .quiz-prev-btn:active, .show-answer-btn:active, .answer-toggle-btn:active {
    transform: translateY(0);
}

/* Disabled State */
.memory-btn:disabled, .predict-submit-btn:disabled, .quiz-check-btn:disabled, .predict-check-btn:disabled, .quiz-prev-btn:disabled, .quiz-next-btn:disabled, .run-btn:disabled, .run-button:disabled {
    opacity: 0.45;
    cursor: not-allowed;
    pointer-events: none;
    transform: none !important;
    box-shadow: none !important;
}

/* ==========================================================================
   1. VARIABLE MEMORY LAB WIDGET
   ========================================================================== */
.memory-lab-grid {
    display: grid;
    grid-template-columns: 1.1fr 1fr;
    gap: 20px;
}

.memory-editor-panel {
    display: flex;
    flex-direction: column;
    background: #0D1117;
    border-radius: 12px;
    overflow: hidden;
    border: 1px solid #30363D;
    box-shadow: 0 4px 14px rgba(0, 0, 0, 0.08);
}

.memory-editor-header {
    background: #161B22;
    padding: 10px 16px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 11.5px;
    font-weight: 700;
    color: #8B949E;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    border-bottom: 1px solid #30363D;
}

.memory-status-tag {
    background: rgba(56, 189, 248, 0.15);
    color: #38BDF8;
    padding: 2px 8px;
    border-radius: 4px;
    font-size: 10.5px;
    letter-spacing: 0.5px;
}

.memory-editor-wrapper {
    position: relative;
    height: 220px;
    min-height: 220px;
    background: #0D1117;
    overflow: hidden;
}

.memory-code-highlight,
.memory-code-input {
    margin: 0 !important;
    padding: 16px !important;
    border: none !important;
    font-family: 'JetBrains Mono', Consolas, 'Fira Code', monospace !important;
    font-size: 13px !important;
    line-height: 22px !important;
    letter-spacing: 0 !important;
    tab-size: 2 !important;
    white-space: pre-wrap !important;
    word-break: break-word !important;
    box-sizing: border-box !important;
}

.memory-code-highlight {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: transparent !important;
    pointer-events: none;
    overflow: hidden;
    z-index: 1;
    color: #E6EDF3;
    border-radius: 0 !important;
}

.memory-code-highlight code {
    background: transparent !important;
    padding: 0 !important;
    border: none !important;
    font-size: inherit !important;
    font-family: inherit !important;
    line-height: inherit !important;
    display: block;
}

.memory-code-input {
    position: relative;
    width: 100%;
    height: 100%;
    min-height: 220px;
    background: transparent !important;
    color: transparent !important;
    caret-color: #58A6FF !important;
    outline: none !important;
    resize: none !important;
    z-index: 2;
    overflow-y: auto;
}

.memory-code-input::selection {
    background: rgba(56, 189, 248, 0.3) !important;
    color: transparent !important;
}

/* Custom scrollbar for memory editor */
.memory-code-input::-webkit-scrollbar {
    width: 6px;
}
.memory-code-input::-webkit-scrollbar-track {
    background: #0D1117;
}
.memory-code-input::-webkit-scrollbar-thumb {
    background: #30363D;
    border-radius: 4px;
}
.memory-code-input::-webkit-scrollbar-thumb:hover {
    background: #484F58;
}

.memory-editor-footer {
    background: #161B22;
    border-top: 1px solid #30363D;
    padding: 10px 14px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.memory-editor-footer .memory-actions {
    display: flex;
    gap: 10px;
    margin-top: 0;
    align-items: center;
}

.memory-editor-hint {
    font-size: 11.5px;
    font-weight: 600;
    color: #8B949E;
    display: flex;
    align-items: center;
    gap: 4px;
}

.memory-editor-footer .memory-btn-primary {
    background: linear-gradient(135deg, #6366F1 0%, #4F46E5 100%);
    color: #FFFFFF;
    border: 1px solid rgba(255, 255, 255, 0.15);
    box-shadow: 0 2px 8px rgba(79, 70, 229, 0.35);
    padding: 8px 16px;
    font-size: 13px;
    border-radius: 7px;
    display: inline-flex;
    align-items: center;
    gap: 6px;
    cursor: pointer;
    font-weight: 600;
    transition: all 0.2s ease;
}

.memory-editor-footer .memory-btn-primary:hover {
    background: linear-gradient(135deg, #4F46E5 0%, #4338CA 100%);
    box-shadow: 0 4px 14px rgba(79, 70, 229, 0.5);
    transform: translateY(-1px);
}

.memory-editor-footer .memory-btn-secondary {
    background: #21262D;
    color: #C9D1D9;
    border: 1px solid #30363D;
    padding: 8px 14px;
    font-size: 13px;
    border-radius: 7px;
    display: inline-flex;
    align-items: center;
    gap: 6px;
    cursor: pointer;
    font-weight: 600;
    transition: all 0.2s ease;
}

.memory-editor-footer .memory-btn-secondary:hover {
    background: #30363D;
    color: #FFFFFF;
    border-color: #8B949E;
}

.memory-slots-panel {
    display: flex;
    flex-direction: column;
    gap: 14px;
}

.memory-slots-title {
    font-size: 13.5px;
    font-weight: 700;
    color: #596579;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.memory-slots-container {
    display: flex;
    flex-direction: column;
    gap: 10px;
    min-height: 140px;
}

.memory-scenario-bar {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 16px;
    padding: 10px 14px;
    background: #F8FAFC;
    border: 1px solid var(--widget-border);
    border-radius: 10px;
    flex-wrap: wrap;
}

.scenario-label {
    font-size: 13px;
    font-weight: 700;
    color: #475569;
}

.scenario-chips {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
}

.scenario-chip {
    padding: 5px 12px;
    font-size: 12px;
    font-weight: 600;
    border-radius: 6px;
    border: 1px solid #E2E8F0;
    background: #FFFFFF;
    color: #475569;
    cursor: pointer;
    transition: all 0.2s ease;
}

.scenario-chip:hover {
    border-color: var(--widget-accent);
    color: var(--widget-accent);
}

.scenario-chip.active {
    background: var(--widget-accent);
    color: #FFFFFF;
    border-color: var(--widget-accent);
    box-shadow: 0 2px 6px rgba(99, 102, 241, 0.25);
}

.memory-capacity-badge {
    font-size: 11px;
    font-weight: 700;
    padding: 3px 8px;
    border-radius: 6px;
    background: var(--widget-accent-light);
    color: var(--widget-accent);
    text-transform: uppercase;
}

.memory-slot-address {
    font-family: 'JetBrains Mono', monospace;
    font-size: 10.5px;
    color: #94A3B8;
    background: #F1F5F9;
    padding: 2px 6px;
    border-radius: 4px;
    border: 1px solid #E2E8F0;
}

.memory-slot-card {
    background: #FFFFFF;
    border: 1px solid var(--widget-border);
    border-radius: 12px;
    padding: 14px 18px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: all 0.25s ease;
    animation: fadeInSlide 0.3s ease-out;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.03);
}

.memory-slot-card.reassigned {
    border-color: #10B981;
    background: #F0FDF4;
}

.memory-slot-left {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.memory-slot-name {
    font-family: 'JetBrains Mono', monospace;
    font-weight: 700;
    font-size: 15px;
    color: #172033;
    display: flex;
    align-items: center;
    gap: 8px;
}

.memory-slot-kind {
    font-size: 11px;
    font-weight: 700;
    padding: 2px 7px;
    border-radius: 4px;
    text-transform: uppercase;
    background: #E2E8F0;
    color: #475569;
}

.memory-slot-kind.let { background: #DBEAFE; color: #1E40AF; }
.memory-slot-kind.const { background: #FEF3C7; color: #92400E; }
.memory-slot-kind.var { background: #FCE7F3; color: #9D174D; }

.memory-slot-type {
    font-size: 12px;
    color: #7B8496;
    display: flex;
    align-items: center;
    gap: 6px;
}

.memory-slot-val-box {
    background: #F8FAFC;
    border: 1px solid var(--widget-border);
    padding: 8px 16px;
    border-radius: 8px;
    font-family: 'JetBrains Mono', monospace;
    font-weight: 700;
    font-size: 15px;
    color: var(--widget-accent);
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.04);
}

.memory-steps-box {
    margin-top: 18px;
    padding: 16px 18px;
    border-radius: 12px;
    background: #F8F9FC;
    border: 1px solid var(--widget-border);
}

.memory-steps-header {
    font-weight: 700;
    font-size: 13.5px;
    color: #172033;
    margin-bottom: 10px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.memory-steps-list {
    margin: 0;
    padding-left: 20px;
    color: #596579;
    font-size: 13.5px;
    line-height: 1.7;
}

.memory-steps-list li {
    margin-bottom: 6px;
}

.memory-steps-list code {
    color: var(--widget-accent);
    font-weight: 600;
}

/* ==========================================================================
   2. KEYWORD COMPARISON MATRIX WIDGET
   ========================================================================== */
.comparison-tabs {
    display: flex;
    gap: 10px;
    margin-bottom: 20px;
    flex-wrap: wrap;
}

.comparison-tab-btn {
    padding: 9px 18px;
    border-radius: 8px;
    border: 1px solid var(--widget-border);
    background: #F8F9FC;
    color: #596579;
    font-weight: 600;
    font-size: 13.5px;
    cursor: pointer;
    transition: all 0.2s ease;
}

.comparison-tab-btn:hover {
    border-color: var(--widget-accent);
    color: var(--widget-accent);
    background: var(--widget-accent-light);
}

.comparison-tab-btn.active {
    background: var(--widget-accent);
    color: #FFFFFF;
    border-color: var(--widget-accent);
    box-shadow: 0 2px 8px rgba(108, 76, 232, 0.25);
}

.comparison-card {
    background: #F8F9FC;
    border: 1px solid var(--widget-border);
    border-radius: 12px;
    padding: 22px;
}

.comparison-title {
    font-size: 16px;
    font-weight: 700;
    color: #172033;
    margin-bottom: 16px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.comparison-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 14px;
    margin-bottom: 16px;
}

.comparison-metric {
    background: #FFFFFF;
    border: 1px solid var(--widget-border);
    border-radius: 10px;
    padding: 12px 16px;
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.comparison-metric-label {
    font-size: 12px;
    font-weight: 600;
    color: #7B8496;
    text-transform: uppercase;
}

.comparison-metric-value {
    font-size: 14.5px;
    font-weight: 700;
    color: #172033;
}

.comparison-metric-value.yes { color: #059669; }
.comparison-metric-value.no { color: #DC2626; }

.comparison-desc {
    font-size: 14px;
    color: #596579;
    line-height: 1.65;
    background: #FFFFFF;
    border: 1px solid var(--widget-border);
    padding: 14px 18px;
    border-radius: 10px;
}

/* ==========================================================================
   3. PREDICT BEFORE RUN (PLACEMENT CHALLENGE)
   ========================================================================== */
.predict-code-box {
    background: #0D1117;
    border: 1px solid #30363D;
    border-radius: 12px;
    padding: 16px 20px 20px;
    margin-bottom: 20px;
    overflow-x: auto;
    position: relative;
    box-shadow: 0 4px 14px rgba(0, 0, 0, 0.15);
}

.predict-code-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-bottom: 12px;
    margin-bottom: 14px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    color: #94A3B8;
    font-size: 12px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.6px;
}

.predict-code-header span:first-child {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    color: #E2E8F0;
    font-size: 12.5px;
    font-weight: 700;
}

.predict-badge {
    font-size: 11px;
    font-weight: 700;
    background: rgba(108, 76, 232, 0.25);
    color: #C4B5FD;
    border: 1px solid rgba(167, 139, 250, 0.4);
    padding: 3px 10px;
    border-radius: 9999px;
    letter-spacing: 0.5px;
    text-transform: uppercase;
}

.predict-code-box pre {
    margin: 0;
    padding: 0;
    background: transparent;
    border: 0;
    box-shadow: none;
    font-family: 'JetBrains Mono', Consolas, monospace;
    font-size: 13px;
    line-height: 1.55;
    color: #F0F6FC;
}

.predict-prompt,
.quiz-prompt {
    font-weight: 700;
    font-size: 15.5px;
    color: #0F172A;
    margin: 8px 0 14px;
    line-height: 1.55;
}

.quiz-prompt code,
.predict-prompt code {
    background: rgba(108, 76, 232, 0.08);
    color: #6C4CE8;
    padding: 2px 7px;
    border-radius: 5px;
    font-size: 0.92em;
    font-family: 'JetBrains Mono', Consolas, monospace;
    font-weight: 700;
}

.predict-options-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 10px;
    margin-bottom: 16px;
}

/* Predict Option (Div card with radio dot) */
.predict-option {
    border: 1.5px solid var(--widget-border);
    background: #F8F9FC;
    border-radius: 10px;
    padding: 11px 16px;
    display: flex;
    align-items: center;
    gap: 10px;
    cursor: pointer;
    font-family: 'JetBrains Mono', Consolas, monospace;
    font-size: 13px;
    font-weight: 600;
    color: #172033;
    transition: all 0.2s ease;
    user-select: none;
}

.predict-option:hover {
    border-color: var(--widget-accent);
    background: var(--widget-accent-light);
    transform: translateY(-1px);
}

.predict-option.selected {
    border-color: var(--widget-accent);
    background: var(--widget-accent-light);
    color: var(--widget-accent);
    box-shadow: 0 0 0 2px rgba(108, 76, 232, 0.25);
}

.predict-option.correct {
    border-color: var(--widget-success) !important;
    background: var(--widget-success-light) !important;
    color: #065F46 !important;
    box-shadow: 0 0 0 2px rgba(16, 185, 129, 0.25);
}

.predict-option.wrong {
    border-color: var(--widget-danger) !important;
    background: var(--widget-danger-light) !important;
    color: #991B1B !important;
    box-shadow: 0 0 0 2px rgba(239, 68, 68, 0.25);
}

/* Predict Option Button (Native <button> style used in quiz slides) */
.predict-option-btn {
    width: 100%;
    text-align: left;
    border: 1.5px solid var(--widget-border);
    background: #F8F9FC;
    border-radius: 10px;
    padding: 11px 16px;
    display: flex;
    align-items: center;
    justify-content: flex-start;
    gap: 8px;
    cursor: pointer;
    font-family: 'JetBrains Mono', Consolas, monospace;
    font-size: 13px;
    font-weight: 600;
    color: #1E293B;
    line-height: 1.45;
    transition: all 0.2s cubic-bezier(0.16, 1, 0.3, 1);
    box-sizing: border-box;
}

.predict-option-btn:hover {
    border-color: var(--widget-accent);
    background: var(--widget-accent-light);
    color: var(--widget-accent);
    transform: translateY(-1.5px);
    box-shadow: 0 4px 12px rgba(108, 76, 232, 0.08);
}

.predict-option-btn:active {
    transform: translateY(0);
}

.predict-option-btn.selected {
    border-color: var(--widget-accent);
    background: var(--widget-accent-light);
    color: var(--widget-accent);
    box-shadow: 0 0 0 2px rgba(108, 76, 232, 0.25);
    font-weight: 700;
}

.predict-option-btn.correct {
    border-color: var(--widget-success) !important;
    background: var(--widget-success-light) !important;
    color: #065F46 !important;
    box-shadow: 0 0 0 2px rgba(16, 185, 129, 0.25);
    font-weight: 700;
}

.predict-option-btn.wrong {
    border-color: var(--widget-danger) !important;
    background: var(--widget-danger-light) !important;
    color: #991B1B !important;
    box-shadow: 0 0 0 2px rgba(239, 68, 68, 0.25);
    font-weight: 700;
}

.predict-radio {
    width: 18px;
    height: 18px;
    border-radius: 50%;
    border: 2px solid #CBD5E1;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    transition: all 0.2s;
}

.predict-option.selected .predict-radio {
    border-color: var(--widget-accent);
    background: var(--widget-accent);
}

.predict-option.selected .predict-radio::after {
    content: '';
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: #FFFFFF;
}

.predict-result-box {
    display: none;
    margin-top: 16px;
    padding: 16px 20px;
    border-radius: 12px;
    animation: fadeInSlide 0.25s ease-out;
}

.predict-result-box:empty {
    display: none !important;
    margin: 0 !important;
    padding: 0 !important;
    border: none !important;
}

.predict-result-box.success {
    display: block;
    background: #ECFDF5;
    border: 1.5px solid #A7F3D0;
    color: #065F46;
}

.predict-result-box.error {
    display: block;
    background: #FEF2F2;
    border: 1.5px solid #FECACA;
    color: #991B1B;
}

.predict-result-header {
    font-weight: 800;
    font-size: 15px;
    margin-bottom: 8px;
}

.predict-result-desc {
    font-size: 14px;
    line-height: 1.6;
}

/* ==========================================================================
   4. CONST REFERENCE TRAP WIDGET
   ========================================================================== */
.reference-diagram {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 24px;
    margin: 20px 0;
    padding: 24px;
    background: #F8F9FC;
    border-radius: 12px;
    border: 1px solid var(--widget-border);
}

.reference-card {
    background: #FFFFFF;
    border: 2px solid var(--widget-accent);
    border-radius: 12px;
    padding: 18px 22px;
    text-align: center;
    min-width: 160px;
    box-shadow: 0 2px 8px rgba(108, 76, 232, 0.08);
}

.reference-card-label {
    font-size: 11px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: #7B8496;
    margin-bottom: 6px;
}

.reference-card-var {
    font-family: 'JetBrains Mono', monospace;
    font-size: 16px;
    font-weight: 800;
    color: var(--widget-accent);
}

.reference-arrow {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
    color: var(--widget-accent);
    font-weight: 700;
    font-size: 24px;
}

.reference-arrow small {
    font-size: 11px;
    text-transform: uppercase;
    color: #7B8496;
    letter-spacing: 0.5px;
}

.reference-heap-box {
    background: #FFFFFF;
    border: 2px dashed #94A3B8;
    border-radius: 12px;
    padding: 18px 22px;
    min-width: 220px;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.reference-heap-prop {
    background: #F1F5F9;
    border: 1px solid #CBD5E1;
    padding: 6px 12px;
    border-radius: 6px;
    font-family: 'JetBrains Mono', monospace;
    font-size: 13.5px;
    font-weight: 600;
    color: #172033;
    transition: all 0.25s ease;
}

.reference-controls {
    display: flex;
    gap: 12px;
    justify-content: center;
    margin-top: 18px;
    flex-wrap: wrap;
}

.reference-feedback {
    margin-top: 18px;
    padding: 14px 18px;
    border-radius: 10px;
    font-size: 14px;
    line-height: 1.6;
    animation: fadeInSlide 0.25s ease-out;
}

.reference-feedback.success {
    background: #ECFDF5;
    border: 1px solid #A7F3D0;
    color: #065F46;
}

.reference-feedback.error {
    background: #FEF2F2;
    border: 1px solid #FECACA;
    color: #991B1B;
}

/* ==========================================================================
   5. STEP RUNNER (EXECUTION STEPPER)
   ========================================================================== */
.step-runner-controls {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 18px;
}

.step-counter-badge {
    font-size: 12.5px;
    font-weight: 700;
    color: var(--widget-accent);
    background: var(--widget-accent-light);
    padding: 4px 12px;
    border-radius: 9999px;
    border: 1px solid rgba(108, 76, 232, 0.2);
}

.step-content-display {
    background: #F8F9FC;
    border: 1px solid var(--widget-border);
    border-radius: 12px;
    padding: 20px 24px;
    font-size: 14.5px;
    line-height: 1.7;
    color: #334155;
    min-height: 90px;
}

.step-content-display code {
    color: var(--widget-accent);
    font-weight: 700;
}

/* ==========================================================================
   6. TYPE INSPECTOR WIDGET (Data Types)
   ========================================================================== */
.type-inspector-buttons {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
    margin-bottom: 20px;
}

.type-insp-btn {
    padding: 7px 14px;
    border-radius: 8px;
    border: 1px solid var(--widget-border);
    background: #F8F9FC;
    color: #334155;
    font-family: 'JetBrains Mono', Consolas, monospace;
    font-size: 13px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
}

.type-insp-btn:hover {
    border-color: var(--widget-accent);
    background: var(--widget-accent-light);
    color: var(--widget-accent);
}

.type-insp-btn.active {
    background: var(--widget-accent);
    color: #FFFFFF;
    border-color: var(--widget-accent);
    box-shadow: 0 2px 8px rgba(108, 76, 232, 0.25);
}

.type-inspector-card {
    background: #F8F9FC;
    border: 1px solid var(--widget-border);
    border-radius: 12px;
    padding: 22px;
    animation: fadeInSlide 0.25s ease-out;
}

.type-insp-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 18px;
    padding-bottom: 14px;
    border-bottom: 1px solid var(--widget-border);
}

.type-insp-val {
    font-family: 'JetBrains Mono', Consolas, monospace;
    font-size: 18px;
    font-weight: 800;
    color: #172033;
}

.type-insp-category {
    font-size: 12px;
    font-weight: 700;
    padding: 4px 10px;
    border-radius: 6px;
    text-transform: uppercase;
}

.type-insp-category.primitive {
    background: #DBEAFE;
    color: #1E40AF;
}

.type-insp-category.reference {
    background: #FEF3C7;
    color: #92400E;
}

.type-insp-details-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 12px;
    margin-bottom: 18px;
}

.type-insp-metric {
    background: #FFFFFF;
    border: 1px solid var(--widget-border);
    border-radius: 8px;
    padding: 10px 14px;
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.type-insp-label {
    font-size: 11px;
    font-weight: 700;
    color: #7B8496;
    text-transform: uppercase;
}

.type-insp-type, .type-insp-typeof, .type-insp-storage, .type-insp-mutable {
    font-family: 'JetBrains Mono', Consolas, monospace;
    font-size: 13.5px;
    font-weight: 700;
    color: #172033;
}

.type-insp-desc {
    font-size: 14px;
    color: #475569;
    line-height: 1.6;
    background: #FFFFFF;
    border: 1px solid var(--widget-border);
    padding: 12px 16px;
    border-radius: 8px;
}

/* ==========================================================================
   7. PRIMITIVE INSPECTOR WIDGET (7 Primitives Deep Dive)
   ========================================================================== */
.primitive-selector-tabs {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
    margin-bottom: 18px;
}

.prim-tab-btn {
    padding: 8px 16px;
    border-radius: 8px;
    border: 1px solid var(--widget-border);
    background: #F8F9FC;
    color: #475569;
    font-size: 13.5px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
}

.prim-tab-btn:hover {
    border-color: var(--widget-accent);
    background: var(--widget-accent-light);
    color: var(--widget-accent);
}

.prim-tab-btn.active {
    background: var(--widget-accent);
    color: #FFFFFF;
    border-color: var(--widget-accent);
    box-shadow: 0 2px 8px rgba(108, 76, 232, 0.25);
}

.primitive-content-panel {
    background: #F8F9FC;
    border: 1px solid var(--widget-border);
    border-radius: 12px;
    padding: 22px;
    animation: fadeInSlide 0.25s ease-out;
}

.prim-panel-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 14px;
}

.prim-panel-title {
    margin: 0;
    font-size: 18px;
    font-weight: 800;
    color: #172033;
}

.prim-panel-tag {
    font-size: 12px;
    font-weight: 700;
    background: var(--widget-accent-light);
    color: var(--widget-accent);
    padding: 3px 10px;
    border-radius: 6px;
}

.prim-panel-code {
    background: var(--widget-dark-bg);
    border: 1px solid var(--widget-dark-border);
    border-radius: 10px;
    padding: 16px;
    margin-bottom: 14px;
    overflow-x: auto;
}

.prim-panel-code pre {
    margin: 0;
    padding: 0;
    background: transparent;
    border: none;
}

.prim-panel-notes {
    font-size: 14px;
    color: #334155;
    line-height: 1.6;
    background: #FFFFFF;
    border: 1px solid var(--widget-border);
    padding: 12px 16px;
    border-radius: 8px;
}

/* ==========================================================================
   8. MEMORY MODEL SIMULATOR (Stack vs Heap)
   ========================================================================== */
.memory-model-actions {
    display: flex;
    gap: 12px;
    margin-bottom: 20px;
    flex-wrap: wrap;
}

.memory-model-display {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
    margin-bottom: 18px;
}

.mm-column {
    background: #F8F9FC;
    border: 1px solid var(--widget-border);
    border-radius: 12px;
    padding: 18px;
}

.mm-column-title {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 13.5px;
    font-weight: 700;
    color: #172033;
    margin-bottom: 14px;
    padding-bottom: 8px;
    border-bottom: 1px solid var(--widget-border);
}

.mm-column-title small {
    font-size: 11px;
    color: #7B8496;
    text-transform: uppercase;
}

.mm-stack-slots {
    display: flex;
    flex-direction: column;
    gap: 10px;
    min-height: 120px;
}

.mm-slot {
    background: #FFFFFF;
    border: 1px solid var(--widget-border);
    border-radius: 8px;
    padding: 10px 14px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-family: 'JetBrains Mono', Consolas, monospace;
}

.mm-slot-var {
    font-weight: 700;
    color: #172033;
}

.mm-slot-val {
    color: var(--widget-accent);
    font-weight: 600;
}

.mm-slot-val.pointer {
    color: #D97706;
    font-weight: 700;
}

.mm-heap-content {
    min-height: 120px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.mm-heap-obj {
    background: #FFFFFF;
    border: 2px dashed #D97706;
    border-radius: 10px;
    padding: 14px 18px;
    width: 100%;
}

.mm-heap-addr {
    font-size: 11px;
    font-weight: 700;
    color: #7B8496;
    margin-bottom: 6px;
}

.mm-heap-body {
    font-family: 'JetBrains Mono', Consolas, monospace;
    font-size: 15px;
    font-weight: 700;
    color: #92400E;
}

.mm-explanation-box {
    padding: 14px 18px;
    border-radius: 10px;
    font-size: 14px;
    line-height: 1.6;
    animation: fadeInSlide 0.25s ease-out;
}

.mm-explanation-box.success {
    background: #ECFDF5;
    border: 1px solid #A7F3D0;
    color: #065F46;
}

.mm-explanation-box.warning {
    background: #FFFBEB;
    border: 1px solid #FDE68A;
    color: #92400E;
}

/* ==========================================================================
   9. TYPEOF PLAYGROUND WIDGET
   ========================================================================== */
.type-pg-input-row {
    display: flex;
    gap: 12px;
    margin-bottom: 14px;
}

.type-pg-input {
    flex: 1;
    padding: 10px 16px;
    background: #F8F9FC;
    border: 1px solid var(--widget-border);
    border-radius: 8px;
    font-family: 'JetBrains Mono', Consolas, monospace;
    font-size: 14px;
    color: #172033;
    outline: none;
    transition: border-color 0.2s ease;
}

.type-pg-input:focus {
    border-color: var(--widget-accent);
    background: #FFFFFF;
}

.type-pg-quick-buttons {
    display: flex;
    gap: 8px;
    align-items: center;
    flex-wrap: wrap;
    margin-bottom: 18px;
    font-size: 12.5px;
    color: #7B8496;
}

.type-pg-chip {
    padding: 4px 10px;
    background: #F1F5F9;
    border: 1px solid #E2E8F0;
    border-radius: 6px;
    font-family: 'JetBrains Mono', Consolas, monospace;
    font-size: 12px;
    color: #475569;
    cursor: pointer;
    transition: all 0.2s ease;
}

.type-pg-chip:hover {
    background: var(--widget-accent-light);
    color: var(--widget-accent);
    border-color: var(--widget-accent);
}

.type-pg-result-box {
    background: #F8F9FC;
    border: 1px solid var(--widget-border);
    border-radius: 10px;
    padding: 16px 20px;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.type-pg-result-line {
    font-size: 14px;
    color: #334155;
    display: flex;
    align-items: center;
    gap: 10px;
}

.type-pg-badge {
    font-family: 'JetBrains Mono', Consolas, monospace;
    font-weight: 800;
    font-size: 15px;
    color: var(--widget-accent);
    background: var(--widget-accent-light);
    padding: 3px 10px;
    border-radius: 6px;
}

.type-pg-note {
    font-size: 13px;
    color: #64748B;
    font-style: italic;
    margin-top: 4px;
}

/* ==========================================================================
   10. COERCION LAB WIDGET
   ========================================================================== */
.coercion-buttons-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 10px;
    margin-bottom: 18px;
}

.coercion-btn {
    padding: 10px 14px;
    border-radius: 8px;
    border: 1px solid var(--widget-border);
    background: #F8F9FC;
    font-family: 'JetBrains Mono', Consolas, monospace;
    font-size: 13px;
    font-weight: 600;
    color: #334155;
    cursor: pointer;
    transition: all 0.2s ease;
    text-align: center;
}

.coercion-btn:hover {
    border-color: var(--widget-accent);
    background: var(--widget-accent-light);
    color: var(--widget-accent);
}

.coercion-btn.active {
    background: var(--widget-accent);
    color: #FFFFFF;
    border-color: var(--widget-accent);
    box-shadow: 0 2px 8px rgba(108, 76, 232, 0.25);
}

.coercion-result-card {
    background: #F8F9FC;
    border: 1px solid var(--widget-border);
    border-radius: 12px;
    padding: 20px;
    animation: fadeInSlide 0.25s ease-out;
}

.coercion-expr-header {
    display: flex;
    align-items: center;
    gap: 14px;
    margin-bottom: 14px;
    padding-bottom: 12px;
    border-bottom: 1px solid var(--widget-border);
}

.coercion-expr {
    font-family: 'JetBrains Mono', Consolas, monospace;
    font-size: 16px;
    font-weight: 800;
    color: #172033;
}

.coercion-arrow {
    font-size: 18px;
    color: var(--widget-accent);
}

.coercion-res-badge {
    font-family: 'JetBrains Mono', Consolas, monospace;
    font-size: 15px;
    font-weight: 800;
    color: #065F46;
    background: #ECFDF5;
    border: 1px solid #A7F3D0;
    padding: 4px 12px;
    border-radius: 6px;
}

.coercion-step-flow {
    font-size: 14px;
    line-height: 1.7;
    color: #334155;
}

/* ==========================================================================
   11. TRUTHY / FALSY TESTER WIDGET
   ========================================================================== */
.truthy-falsy-grid {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 10px;
    margin-bottom: 18px;
}

.tf-btn {
    padding: 9px 12px;
    border-radius: 8px;
    border: 1px solid var(--widget-border);
    background: #F8F9FC;
    font-family: 'JetBrains Mono', Consolas, monospace;
    font-size: 12.5px;
    font-weight: 600;
    color: #334155;
    cursor: pointer;
    transition: all 0.2s ease;
    text-align: center;
}

.tf-btn:hover {
    border-color: var(--widget-accent);
    background: var(--widget-accent-light);
    color: var(--widget-accent);
}

.tf-btn.active {
    background: var(--widget-accent);
    color: #FFFFFF;
    border-color: var(--widget-accent);
    box-shadow: 0 2px 8px rgba(108, 76, 232, 0.25);
}

.tf-result-display {
    background: #F8F9FC;
    border: 1px solid var(--widget-border);
    border-radius: 12px;
    padding: 20px;
    animation: fadeInSlide 0.25s ease-out;
}

.tf-res-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 12px;
    padding-bottom: 10px;
    border-bottom: 1px solid var(--widget-border);
}

.tf-val-label {
    font-family: 'JetBrains Mono', Consolas, monospace;
    font-size: 16px;
    font-weight: 800;
    color: #172033;
}

.tf-status-badge {
    font-size: 12px;
    font-weight: 800;
    text-transform: uppercase;
    padding: 4px 12px;
    border-radius: 9999px;
}

.tf-status-badge.truthy {
    background: #ECFDF5;
    color: #065F46;
    border: 1px solid #A7F3D0;
}

.tf-status-badge.falsy {
    background: #FEF2F2;
    color: #991B1B;
    border: 1px solid #FECACA;
}

.tf-boolean-expr {
    font-family: 'JetBrains Mono', Consolas, monospace;
    font-size: 14.5px;
    font-weight: 700;
    color: var(--widget-accent);
    margin-bottom: 8px;
}

.tf-reason {
    font-size: 14px;
    color: #475569;
    line-height: 1.6;
}

/* ==========================================================================
   12. QUIZ DECK / CAROUSEL WIDGET (ONE-AFTER-ANOTHER QUESTIONS)
   ========================================================================== */
.quiz-deck-nav-header {
    display: flex;
    align-items: center;
    gap: 12px;
}

.quiz-step-counter {
    font-size: 13px;
    font-weight: 600;
    color: #475569;
    background: #E2E8F0;
    padding: 3px 10px;
    border-radius: 9999px;
}

.quiz-step-counter strong {
    color: var(--widget-accent);
}

.quiz-pills-bar {
    display: flex;
    gap: 8px;
    margin-bottom: 22px;
    flex-wrap: wrap;
    align-items: center;
}

.quiz-pill {
    padding: 6px 14px;
    border-radius: 9999px;
    border: 1px solid var(--widget-border);
    background: #F8F9FC;
    color: #475569;
    font-weight: 700;
    font-size: 13px;
    cursor: pointer;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    gap: 4px;
}

.quiz-pill:hover {
    border-color: var(--widget-accent);
    background: var(--widget-accent-light);
    color: var(--widget-accent);
}

.quiz-pill.active {
    background: var(--widget-accent);
    color: #FFFFFF;
    border-color: var(--widget-accent);
    box-shadow: 0 2px 8px rgba(108, 76, 232, 0.3);
}

.quiz-pill.correct {
    background: #ECFDF5;
    color: #065F46;
    border-color: #6EE7B7;
}

.quiz-pill.correct.active {
    background: #10B981;
    color: #FFFFFF;
    border-color: #10B981;
}

.quiz-pill.wrong {
    background: #FEF2F2;
    color: #991B1B;
    border-color: #FCA5A5;
}

.quiz-pill.wrong.active {
    background: #EF4444;
    color: #FFFFFF;
    border-color: #EF4444;
}

.quiz-slide {
    display: none;
}

.quiz-slide.active {
    display: block;
}

.quiz-slide-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 14px;
}

.quiz-topic-tag {
    font-size: 12px;
    font-weight: 600;
    color: #64748B;
    background: #F1F5F9;
    padding: 3px 10px;
    border-radius: 6px;
    border: 1px solid #E2E8F0;
}

/* ==========================================================================
   QUIZ DECK WRAPPER & SLIDE COMPONENTS (CHAPTERS 01 TO 28)
   ========================================================================== */
.quiz-deck-wrapper {
    background: #FFFFFF;
    border: 1px solid var(--widget-border);
    border-radius: 14px;
    box-shadow: var(--widget-shadow);
    margin: 32px 0 36px;
    overflow: hidden;
    box-sizing: border-box;
    width: 100%;
}

.quiz-deck-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 14px 20px;
    background: var(--widget-header-bg);
    border-bottom: 1px solid var(--widget-border);
    box-sizing: border-box;
}

.quiz-deck-title {
    font-size: 15px;
    font-weight: 700;
    color: #0F172A;
    display: flex;
    align-items: center;
    gap: 8px;
    margin: 0;
}

.quiz-deck-counter {
    font-size: 11.5px;
    font-weight: 700;
    color: var(--widget-accent);
    background: var(--widget-accent-light);
    padding: 4px 12px;
    border-radius: 9999px;
    border: 1px solid rgba(108, 76, 232, 0.2);
    letter-spacing: 0.3px;
    text-transform: uppercase;
}

.quiz-slide {
    display: none;
    padding: 22px 24px;
    box-sizing: border-box;
}

.quiz-slide.active {
    display: block;
    animation: fadeInSlide 0.25s ease-out;
}

.predict-options {
    display: flex;
    flex-direction: column;
    gap: 10px;
    margin-bottom: 16px;
    width: 100%;
    box-sizing: border-box;
}

.quiz-slide-footer {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: 12px;
    margin-top: 14px;
    width: 100%;
    box-sizing: border-box;
}

.quiz-deck-nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 14px 20px;
    background: #F8FAFC;
    border-top: 1px solid var(--widget-border);
    box-sizing: border-box;
    width: 100%;
}

.quiz-deck-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 14px 20px;
    background: #F8FAFC;
    border-top: 1px solid var(--widget-border);
    flex-wrap: wrap;
    gap: 12px;
    box-sizing: border-box;
    width: 100%;
}

.quiz-score-badge {
    font-weight: 700;
    font-size: 13px;
    color: #334155;
    background: #FFFFFF;
    border: 1px solid var(--widget-border);
    padding: 6px 14px;
    border-radius: 9999px;
    display: inline-flex;
    align-items: center;
    gap: 6px;
}

/* ==========================================================================
   ANIMATIONS & RESPONSIVE BREAKPOINTS
   ========================================================================== */
@keyframes fadeInSlide {
    from {
        opacity: 0;
        transform: translateY(6px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@media (max-width: 900px) {
    .memory-lab-grid, .memory-model-display {
        grid-template-columns: 1fr;
    }
    .predict-options-grid, .comparison-grid {
        grid-template-columns: 1fr;
    }
    .type-insp-details-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    .coercion-buttons-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    .truthy-falsy-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

@media (max-width: 600px) {
    .type-insp-details-grid, .truthy-falsy-grid {
        grid-template-columns: 1fr;
    }
    .reference-diagram {
        flex-direction: column;
    }
    .reference-arrow {
        transform: rotate(90deg);
    }
}


/* ==========================================================================
   LEARNING ROADMAP & MASTERY OVERVIEW PANELS
   ========================================================================== */
.learning-roadmap {
    display: flex;
    align-items: center;
    gap: 8px;
    flex-wrap: wrap;
    padding: 12px 18px;
    background: #F8FAFC;
    border: 1px solid #E2E8F0;
    border-radius: 12px;
    margin-bottom: 24px;
    font-size: 13px;
    font-weight: 600;
}

.roadmap-item {
    color: #64748B;
    padding: 4px 10px;
    border-radius: 6px;
    background: transparent;
    transition: all 0.2s ease;
}

.roadmap-item.active {
    color: var(--widget-accent);
    background: var(--widget-accent-light);
    font-weight: 700;
}

.roadmap-arrow {
    color: #94A3B8;
    font-size: 12px;
}

.mastery-panel {
    background: #FFFFFF;
    border: 1px solid #E2E8F0;
    border-radius: 14px;
    padding: 20px 24px;
    margin-bottom: 32px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.03);
}

.mastery-header {
    font-size: 15px;
    font-weight: 800;
    color: #1E293B;
    margin-bottom: 14px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.mastery-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 12px;
}

.mastery-item {
    background: #F8FAFC;
    border: 1px solid #E2E8F0;
    padding: 10px 14px;
    border-radius: 8px;
    font-size: 13px;
    font-weight: 600;
    color: #334155;
    display: flex;
    align-items: center;
    gap: 8px;
}

.mastery-item::before {
    content: "✓";
    color: #10B981;
    font-weight: 800;
}

/* ==========================================================================
   7 PRIMITIVE CARDS GRID
   ========================================================================== */
.primitive-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 14px;
    margin: 20px 0 28px;
}

.prim-card {
    background: #FFFFFF;
    border: 1px solid var(--widget-border);
    border-radius: 12px;
    padding: 18px;
    transition: all 0.25s ease;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.04);
}

.prim-card:hover {
    border-color: var(--widget-accent);
    transform: translateY(-2px);
    box-shadow: 0 6px 16px rgba(108, 76, 232, 0.08);
}

.prim-card-num {
    font-size: 11px;
    font-weight: 800;
    color: var(--widget-accent);
    background: var(--widget-accent-light);
    width: 26px;
    height: 26px;
    border-radius: 6px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 10px;
}

.prim-card-name {
    font-size: 16px;
    font-weight: 800;
    color: #172033;
    margin-bottom: 6px;
}

.prim-card p {
    font-size: 13px;
    color: #64748B;
    line-height: 1.55;
    margin: 0;
}

/* ==========================================================================
   DIFFICULTY BADGES & REVISION TABLES
   ========================================================================== */
.diff-badge {
    font-size: 12px;
    font-weight: 700;
    padding: 4px 10px;
    border-radius: 9999px;
    display: inline-flex;
    align-items: center;
    gap: 5px;
}

.diff-easy {
    background: #ECFDF5;
    color: #065F46;
    border: 1px solid #A7F3D0;
}

.diff-medium {
    background: #FFFBEB;
    color: #92400E;
    border: 1px solid #FDE68A;
}

.diff-hard {
    background: #FEF2F2;
    color: #991B1B;
    border: 1px solid #FECACA;
}

.revision-table {
    width: 100%;
    border-collapse: collapse;
    margin: 20px 0 28px;
    background: #FFFFFF;
    border-radius: 12px;
    overflow: hidden;
    border: 1px solid #E2E8F0;
    font-size: 14px;
}

.revision-table th {
    background: #F8FAFC;
    padding: 12px 18px;
    text-align: left;
    font-weight: 700;
    color: #334155;
    border-bottom: 1px solid #E2E8F0;
}

.revision-table td {
    padding: 12px 18px;
    border-bottom: 1px solid #F1F5F9;
    color: #475569;
}

.revision-table tr:last-child td {
    border-bottom: none;
}

.revision-table tr:hover td {
    background: #F8FAFC;
}

/* ==========================================================================
   COMPACT TABLE CARD (SCROLLABLE REVISION CARDS)
   ========================================================================== */
.compact-card-table-wrap {
    background: #FFFFFF;
    border: 1px solid var(--widget-border);
    border-radius: 12px;
    margin: 20px 0 28px;
    box-shadow: 0 1px 4px rgba(0, 0, 0, 0.04);
    overflow: hidden;
}

.compact-card-table-header {
    background: #F8FAFC;
    border-bottom: 1px solid #E2E8F0;
    padding: 10px 16px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 13px;
    font-weight: 700;
    color: #334155;
}

.compact-card-table-body {
    max-height: 280px;
    overflow-y: auto;
    overflow-x: auto;
}

.compact-card-table-body::-webkit-scrollbar {
    width: 6px;
    height: 6px;
}

.compact-card-table-body::-webkit-scrollbar-track {
    background: #F8FAFC;
}

.compact-card-table-body::-webkit-scrollbar-thumb {
    background: #CBD5E1;
    border-radius: 4px;
}

.compact-card-table-body::-webkit-scrollbar-thumb:hover {
    background: #94A3B8;
}

.compact-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 13px;
    margin: 0;
}

.compact-table th {
    position: sticky;
    top: 0;
    background: #F1F5F9;
    z-index: 2;
    padding: 10px 14px;
    text-align: left;
    font-weight: 700;
    color: #334155;
    border-bottom: 1px solid #E2E8F0;
    font-size: 12.5px;
}

.compact-table td {
    padding: 9px 14px;
    border-bottom: 1px solid #F1F5F9;
    color: #475569;
}

.compact-table tr:hover td {
    background: #F8FAFC;
}

.compact-table code {
    font-size: 12px;
    padding: 2px 6px;
}

.status-badge {
    font-size: 12px;
    font-weight: 700;
    padding: 3px 8px;
    border-radius: 4px;
}

.status-valid {
    background: #ECFDF5;
    color: #065F46;
}

.status-invalid {
    background: #FEF2F2;
    color: #991B1B;
}

.status-warning {
    background: #FFFBEB;
    color: #92400E;
}

.status-info {
    background: #EFF6FF;
    color: #1D4ED8;
}

.red-card {
    background: #FEF2F2;
    border-color: #FECACA;
}

.red-card h4 {
    color: #991B1B;
}

.teal-card {
    background: #F0FDFA;
    border-color: #CCFBF1;
}

.teal-card h4 {
    color: #0F766E;
}

.blue-card {
    background: #EFF6FF;
    border-color: #DBEAFE;
}

.blue-card h4 {
    color: #1E40AF;
}

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

@media (max-width: 600px) {
    .mastery-grid {
        grid-template-columns: 1fr;
    }
    .learning-roadmap {
        flex-direction: column;
        align-items: flex-start;
    }
    .roadmap-arrow {
        display: none;
    }
}


/* ==========================================================================
   7 PRIMITIVE INSPECTOR ENHANCED PANEL
   ========================================================================== */
.primitive-selector-tabs {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
    margin-bottom: 20px;
}

.prim-tab-btn {
    padding: 9px 18px;
    border-radius: 8px;
    border: 1px solid var(--widget-border);
    background: #F8F9FC;
    color: #475569;
    font-size: 13.5px;
    font-weight: 700;
    cursor: pointer;
    transition: all 0.2s ease;
}

.prim-tab-btn:hover {
    border-color: var(--widget-accent);
    background: var(--widget-accent-light);
    color: var(--widget-accent);
}

.prim-tab-btn.active {
    background: var(--widget-accent);
    color: #FFFFFF;
    border-color: var(--widget-accent);
    box-shadow: 0 2px 8px rgba(108, 76, 232, 0.25);
}

.primitive-content-panel {
    background: #F8F9FC;
    border: 1px solid var(--widget-border);
    border-radius: 14px;
    padding: 24px;
    animation: fadeInSlide 0.25s ease-out;
}

.prim-panel-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 14px;
    padding-bottom: 14px;
    border-bottom: 1px solid var(--widget-border);
}

.prim-panel-title {
    margin: 0 0 4px 0;
    font-size: 20px;
    font-weight: 800;
    color: #172033;
}

.prim-panel-subtitle {
    font-size: 13px;
    font-weight: 600;
    color: #64748B;
}

.prim-panel-tag {
    font-family: 'JetBrains Mono', Consolas, monospace;
    font-size: 12.5px;
    font-weight: 700;
    background: var(--widget-accent-light);
    color: var(--widget-accent);
    padding: 5px 12px;
    border-radius: 6px;
    border: 1px solid rgba(108, 76, 232, 0.15);
}

.prim-panel-desc {
    font-size: 14.5px;
    color: #334155;
    line-height: 1.65;
    margin: 0 0 18px 0;
}

.prim-panel-metrics {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 12px;
    margin-bottom: 18px;
}

.prim-metric {
    background: #FFFFFF;
    border: 1px solid var(--widget-border);
    border-radius: 8px;
    padding: 10px 14px;
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.prim-metric-label {
    font-size: 11px;
    font-weight: 700;
    color: #7B8496;
    text-transform: uppercase;
}

.prim-metric-val {
    font-family: 'JetBrains Mono', Consolas, monospace;
    font-size: 13px;
    font-weight: 700;
    color: #172033;
}

.prim-panel-code {
    background: var(--widget-dark-bg);
    border: 1px solid var(--widget-dark-border);
    border-radius: 10px;
    padding: 18px;
    margin-bottom: 16px;
    overflow-x: auto;
}

.prim-code-header {
    font-size: 11.5px;
    font-weight: 700;
    color: #94A3B8;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 10px;
}

.prim-panel-code pre {
    margin: 0;
    padding: 0;
    background: transparent;
    border: none;
}

.prim-panel-code code {
    font-family: 'JetBrains Mono', Consolas, monospace;
    font-size: 13.5px;
    color: #F8FAFC;
    line-height: 1.6;
}

.prim-panel-notes {
    font-size: 14px;
    color: #334155;
    line-height: 1.65;
    background: #FFFFFF;
    border: 1px solid var(--widget-border);
    border-left: 4px solid var(--widget-accent);
    padding: 14px 18px;
    border-radius: 8px;
}

@media (max-width: 800px) {
    .prim-panel-metrics {
        grid-template-columns: repeat(2, 1fr);
    }
}
@media (max-width: 500px) {
    .prim-panel-metrics {
        grid-template-columns: 1fr;
    }
}

/* ==========================================================================
   PRIMITIVE SPLIT-CARD LAYOUT (LEFT INFO, RIGHT CODE/TIPS)
   ========================================================================== */
.prim-split-layout {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
    align-items: stretch;
    padding: 22px;
    min-height: 380px;
    box-sizing: border-box;
}

.prim-left-col, .prim-right-col {
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    gap: 12px;
    height: 100%;
}

.prim-split-layout .prim-panel-header {
    margin-bottom: 0;
    padding-bottom: 10px;
    flex-shrink: 0;
}

.prim-split-layout .prim-panel-title {
    font-size: 18px;
}

.prim-split-layout .prim-panel-desc {
    font-size: 13.5px;
    line-height: 1.55;
    margin: 0;
    color: #475569;
    min-height: 64px;
}

.prim-split-layout .prim-panel-metrics {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 8px;
    margin: auto 0 0 0;
}

.prim-split-layout .prim-metric {
    padding: 8px 12px;
    min-height: 52px;
    box-sizing: border-box;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.prim-split-layout .prim-metric-label {
    font-size: 10.5px;
}

.prim-split-layout .prim-metric-val {
    font-size: 12.5px;
}

.prim-split-layout .prim-panel-code {
    margin: 0;
    padding: 12px 14px;
    border-radius: 8px;
    min-height: 180px;
    display: flex;
    flex-direction: column;
    overflow-x: auto;
}

.prim-split-layout .prim-panel-code pre {
    margin: 0;
    flex: 1;
}

.prim-split-layout .prim-panel-code code {
    font-size: 12.5px;
    line-height: 1.5;
    white-space: pre;
}

.prim-split-layout .prim-panel-notes {
    font-size: 12.5px;
    padding: 10px 14px;
    line-height: 1.5;
    border-radius: 6px;
    min-height: 54px;
    box-sizing: border-box;
    margin-top: auto;
}

@media (max-width: 880px) {
    .prim-split-layout {
        grid-template-columns: 1fr;
        gap: 16px;
        min-height: auto;
    }
}