/* ============================================
   PQC Challenge Mode - Quantum-Themed Styles
   NO INLINE STYLES - CSP COMPLIANT
   ============================================ */

:root {
    --quantum-primary: #00ffff;
    --quantum-secondary: #ff00ff;
    --quantum-accent: #00ff88;
    --quantum-warning: #ffaa00;
    --quantum-error: #ff4444;
    --quantum-success: #00ff00;

    --bg-dark: #0a0e1a;
    --bg-darker: #050810;
    --bg-panel: #0f1525;
    --bg-hover: #1a2235;

    --text-primary: #e0e6ff;
    --text-secondary: #8891b0;
    --text-dim: #4a5568;

    --border-color: #1e3a5f;
    --border-glow: rgba(0, 255, 255, 0.3);

    --shadow-glow: 0 0 20px rgba(0, 255, 255, 0.2);
    --shadow-strong: 0 8px 32px rgba(0, 0, 0, 0.6);

    --transition-fast: 0.2s ease;
    --transition-medium: 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Courier New', Consolas, monospace;
    background: var(--bg-dark);
    color: var(--text-primary);
    overflow: hidden;
    min-height: 100vh;
}

/* ============================================
   Quantum Background
   ============================================ */

.quantum-bg {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 0;
    opacity: 0.4;
    pointer-events: none;
}

/* ============================================
   Main Container
   ============================================ */

.challenge-container {
    position: relative;
    z-index: 1;
    width: 100%;
    height: 100vh;
    display: flex;
    flex-direction: column;
    padding: 1rem;
    gap: 1rem;
}

/* ============================================
   Header
   ============================================ */

.challenge-header {
    background: var(--bg-panel);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 1rem 1.5rem;
    box-shadow: var(--shadow-glow);
    display: grid;
    grid-template-columns: auto 1fr;
    align-items: center;
    gap: 2rem;
}

.challenge-title {
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--quantum-primary);
    text-shadow: 0 0 10px var(--quantum-primary);
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.title-icon {
    font-size: 2rem;
    animation: pulse-glow 2s ease-in-out infinite;
}

@keyframes pulse-glow {
    0%, 100% { opacity: 1; transform: scale(1); }
    50% { opacity: 0.7; transform: scale(1.1); }
}

.header-stats {
    display: flex;
    gap: 2rem;
    justify-content: center;
    align-items: center;
}

.stat-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.25rem;
}

.stat-label {
    font-size: 0.75rem;
    color: var(--text-dim);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.stat-value {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--quantum-accent);
    text-shadow: 0 0 8px var(--quantum-accent);
}

.api-key-btn {
    background: var(--bg-panel);
    border: 1px solid var(--border-color);
    color: var(--quantum-primary);
    padding: 0.5rem 1rem;
    border-radius: 6px;
    cursor: pointer;
    transition: all var(--transition-fast);
    font-family: inherit;
    font-size: 0.85rem;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.api-key-btn:hover {
    border-color: var(--quantum-primary);
    background: rgba(0, 255, 255, 0.1);
    transform: translateY(-2px);
    box-shadow: 0 0 15px rgba(0, 255, 255, 0.3);
}

.about-btn {
    background: var(--bg-panel);
    border: 1px solid var(--border-color);
    color: var(--quantum-accent);
    padding: 0.5rem 1rem;
    border-radius: 6px;
    cursor: pointer;
    transition: all var(--transition-fast);
    font-family: inherit;
    font-size: 0.85rem;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.about-btn:hover {
    border-color: var(--quantum-accent);
    background: rgba(255, 0, 255, 0.1);
    transform: translateY(-2px);
    box-shadow: 0 0 15px rgba(255, 0, 255, 0.3);
}

/* ============================================
   Main Grid Layout
   ============================================ */

.challenge-grid {
    flex: 1;
    display: grid;
    grid-template-columns: 2fr 1fr;
    grid-template-rows: 1.8fr 1fr; /* Guide gets more height (1.8), Puzzle gets less (1) */
    gap: 1rem;
    overflow: hidden;
}

.terminal-panel {
    grid-column: 1;
    grid-row: 1;
}

.guide-panel {
    grid-column: 2;
    grid-row: 1;
}

.puzzle-panel {
    grid-column: 2;
    grid-row: 2;
}

.viz-panel {
    grid-column: 1;
    grid-row: 2;
    display: flex; /* Always visible */
}

/* ============================================
   Panel Styles
   ============================================ */

.panel {
    background: var(--bg-panel);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    box-shadow: var(--shadow-glow);
    transition: border-color var(--transition-fast);
}

.panel:hover {
    border-color: var(--quantum-primary);
    box-shadow: 0 0 30px rgba(0, 255, 255, 0.3);
}

.panel-header {
    padding: 0.75rem 1.25rem;
    background: rgba(0, 255, 255, 0.05);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.panel-icon {
    font-size: 1.3rem;
}

.panel-header h2 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--quantum-primary);
    flex: 1;
}

.panel-body {
    flex: 1;
    overflow: hidden;
    display: flex;
    flex-direction: column;
}

/* ============================================
   Terminal Styles
   ============================================ */

.terminal-controls {
    display: flex;
    gap: 0.5rem;
}

.control-btn {
    background: transparent;
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    padding: 0.25rem 0.5rem;
    border-radius: 4px;
    cursor: pointer;
    transition: all var(--transition-fast);
    font-size: 0.9rem;
}

.control-btn:hover {
    border-color: var(--quantum-primary);
    color: var(--quantum-primary);
    background: rgba(0, 255, 255, 0.1);
}

.terminal {
    flex: 1;
    overflow-y: auto;
    padding: 0.75rem;
    font-family: 'Courier New', monospace;
    font-size: 0.8rem;
    line-height: 1.4;
    background: var(--bg-darker);
}

.terminal::-webkit-scrollbar {
    width: 8px;
}

.terminal::-webkit-scrollbar-track {
    background: var(--bg-darker);
}

.terminal::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 4px;
}

.terminal::-webkit-scrollbar-thumb:hover {
    background: var(--quantum-primary);
}

.terminal-line {
    margin-bottom: 0.35rem;
}

.terminal-line.command {
    color: var(--quantum-accent);
}

.terminal-line.output {
    color: var(--text-primary);
}

.terminal-line.error {
    color: var(--quantum-error);
}

.terminal-line.success {
    color: var(--quantum-success);
}

.terminal-line.warning {
    color: var(--quantum-warning);
}

.terminal-prompt {
    color: var(--quantum-primary);
    font-weight: 700;
    margin-right: 0.5rem;
    font-size: 0.8rem;
}

.terminal-input-line {
    display: flex;
    align-items: center;
    padding: 0.75rem;
    background: var(--bg-darker);
    border-top: 1px solid var(--border-color);
}

.terminal-input {
    flex: 1;
    background: transparent;
    border: none;
    color: var(--text-primary);
    font-family: 'Courier New', monospace;
    font-size: 0.8rem;
    outline: none;
    caret-color: var(--quantum-primary);
}

.terminal-cursor {
    display: inline-block;
    width: 0.6em;
    height: 1em;
    background: var(--quantum-primary);
    animation: cursor-blink 1s step-end infinite;
    vertical-align: text-bottom;
}

@keyframes cursor-blink {
    0%, 100% { opacity: 1; }
    50% { opacity: 0; }
}

/* ============================================
   Cipher Guide Styles
   ============================================ */

.guide-status {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.75rem;
    color: var(--text-secondary);
}

.status-indicator {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--text-dim);
}

.status-indicator.active {
    background: var(--quantum-success);
    box-shadow: 0 0 8px var(--quantum-success);
    animation: pulse-indicator 2s ease-in-out infinite;
}

@keyframes pulse-indicator {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

.cipher-guide {
    flex: 1;
    overflow-y: auto;
    padding: 0.75rem;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.cipher-guide::-webkit-scrollbar {
    width: 6px;
}

.cipher-guide::-webkit-scrollbar-track {
    background: transparent;
}

.cipher-guide::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 3px;
}

.guide-message {
    display: flex;
    gap: 0.5rem;
    animation: slide-in 0.3s ease-out;
}

@keyframes slide-in {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.guide-message.system .message-content {
    background: rgba(0, 255, 255, 0.1);
    border-left: 2px solid var(--quantum-primary);
}

.guide-message.hint .message-content {
    background: rgba(255, 170, 0, 0.1);
    border-left: 2px solid var(--quantum-warning);
}

.guide-message.success .message-content {
    background: rgba(0, 255, 0, 0.1);
    border-left: 2px solid var(--quantum-success);
}

.guide-message.error .message-content {
    background: rgba(255, 68, 68, 0.1);
    border-left: 2px solid var(--quantum-error);
}

.message-avatar {
    font-size: 1.25rem;
    flex-shrink: 0;
    line-height: 1;
}

.message-content {
    flex: 1;
    padding: 0.5rem 0.75rem;
    border-radius: 6px;
    background: rgba(255, 255, 255, 0.05);
    font-size: 0.8rem;
}

.message-header {
    display: none;
}

.message-content p {
    margin-bottom: 0.35rem;
    line-height: 1.4;
    font-size: 0.8rem;
}

.message-content h3,
.message-content h4,
.message-content strong {
    font-size: 0.85rem;
    margin-bottom: 0.35rem;
    line-height: 1.4;
}

.message-content ul,
.message-content ol {
    margin-bottom: 0.35rem;
    padding-left: 1.25rem;
    font-size: 0.8rem;
    line-height: 1.4;
}

.message-content li {
    margin-bottom: 0.25rem;
}

.message-content code {
    background: var(--bg-darker);
    color: var(--quantum-accent);
    padding: 0.15rem 0.35rem;
    border-radius: 3px;
    font-size: 0.75rem;
    border: 1px solid var(--border-color);
}

.guide-hint-controls {
    padding: 0.75rem;
    display: flex;
    gap: 0.5rem;
    border-top: 1px solid var(--border-color);
}

.btn {
    flex: 1;
    padding: 0.5rem 0.75rem;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    background: var(--bg-darker);
    color: var(--text-primary);
    cursor: pointer;
    transition: all var(--transition-fast);
    font-family: inherit;
    font-size: 0.75rem;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.2rem;
}

.btn:hover:not(:disabled) {
    border-color: var(--quantum-primary);
    background: rgba(0, 255, 255, 0.1);
    transform: translateY(-1px);
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.btn-hint {
    border-color: var(--quantum-warning);
}

.btn-hint:hover:not(:disabled) {
    border-color: var(--quantum-warning);
    background: rgba(255, 170, 0, 0.1);
}

.btn-solution {
    border-color: var(--quantum-error);
}

.btn-solution:hover:not(:disabled) {
    border-color: var(--quantum-error);
    background: rgba(255, 68, 68, 0.1);
}

.hint-cost,
.solution-cost {
    font-size: 0.65rem;
    color: var(--text-dim);
}

/* ============================================
   Puzzle Panel Styles
   ============================================ */

.difficulty-badge {
    padding: 0.25rem 0.75rem;
    border-radius: 12px;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.difficulty-badge.beginner {
    background: rgba(0, 255, 0, 0.2);
    color: var(--quantum-success);
    border: 1px solid var(--quantum-success);
}

.difficulty-badge.intermediate {
    background: rgba(255, 170, 0, 0.2);
    color: var(--quantum-warning);
    border: 1px solid var(--quantum-warning);
}

.difficulty-badge.advanced {
    background: rgba(255, 0, 255, 0.2);
    color: var(--quantum-secondary);
    border: 1px solid var(--quantum-secondary);
}

.difficulty-badge.expert {
    background: rgba(255, 68, 68, 0.2);
    color: var(--quantum-error);
    border: 1px solid var(--quantum-error);
}

.puzzle-info {
    padding: 0.75rem;
    flex: 1;
    overflow-y: auto;
}

.puzzle-info h3 {
    color: var(--quantum-accent);
    margin-bottom: 0.5rem;
    font-size: 0.95rem;
}

.puzzle-description {
    color: var(--text-secondary);
    line-height: 1.4;
    margin-bottom: 0.75rem;
    font-size: 0.8rem;
}

.puzzle-data {
    background: var(--bg-darker);
    padding: 0.75rem;
    border-radius: 6px;
    border: 1px solid var(--border-color);
    font-family: 'Courier New', monospace;
    font-size: 0.75rem;
    word-break: break-all;
    overflow-x: auto;
}

.puzzle-progress {
    padding: 0.75rem;
    border-top: 1px solid var(--border-color);
}

.progress-bar {
    height: 8px;
    background: var(--bg-darker);
    border-radius: 4px;
    overflow: hidden;
    margin-bottom: 0.5rem;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--quantum-primary), var(--quantum-accent));
    border-radius: 4px;
    width: 0%;
    transition: width 0.5s ease;
    box-shadow: 0 0 10px var(--quantum-primary);
}

.progress-stats {
    display: flex;
    justify-content: center;
    gap: 2rem;
    font-size: 0.7rem;
    color: var(--text-dim);
}

/* ============================================
   Visualization Panel
   ============================================ */

.webgpu-status {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.75rem;
    color: var(--text-secondary);
}

.crypto-canvas {
    width: 100%;
    height: 100%;
    min-height: 200px;
}

.viz-legend {
    padding: 0.5rem 0.75rem;
    border-top: 1px solid var(--border-color);
    display: flex;
    gap: 0.75rem;
    flex-wrap: wrap;
    font-size: 0.7rem;
}

.legend-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.legend-color {
    width: 12px;
    height: 12px;
    border-radius: 2px;
}

/* ============================================
   Modal Styles
   ============================================ */

.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.8);
    backdrop-filter: blur(4px);
    display: none;
    justify-content: center;
    align-items: center;
    z-index: 1000;
    animation: fade-in 0.3s ease;
}

.modal.active {
    display: flex;
}

@keyframes fade-in {
    from { opacity: 0; }
    to { opacity: 1; }
}

.modal-content {
    background: var(--bg-panel);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    max-width: 800px;
    width: 90%;
    max-height: 80vh;
    overflow: hidden;
    box-shadow: var(--shadow-strong);
    animation: slide-up 0.3s ease;
}

@keyframes slide-up {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.modal-header {
    padding: 1.5rem;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.modal-header h2 {
    color: var(--quantum-primary);
    font-size: 1.3rem;
}

.modal-close {
    background: transparent;
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    font-size: 1.5rem;
    width: 32px;
    height: 32px;
    border-radius: 50%;
    cursor: pointer;
    transition: all var(--transition-fast);
    display: flex;
    align-items: center;
    justify-content: center;
    line-height: 1;
}

.modal-close:hover {
    border-color: var(--quantum-error);
    color: var(--quantum-error);
    background: rgba(255, 68, 68, 0.1);
    transform: rotate(90deg);
}

.modal-body {
    padding: 1.5rem;
    overflow-y: auto;
    max-height: calc(80vh - 100px);
}

.level-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
    gap: 1rem;
}

.level-card {
    background: var(--bg-darker);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 1rem;
    text-align: center;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.level-card:hover:not(.locked) {
    border-color: var(--quantum-primary);
    background: rgba(0, 255, 255, 0.1);
    transform: translateY(-2px);
}

.level-card.completed {
    border-color: var(--quantum-success);
}

.level-card.current {
    border-color: var(--quantum-accent);
    box-shadow: 0 0 15px rgba(0, 255, 136, 0.3);
}

.level-card.locked {
    opacity: 0.5;
    cursor: not-allowed;
}

.level-number {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--quantum-primary);
    margin-bottom: 0.5rem;
}

.level-name {
    font-size: 0.75rem;
    color: var(--text-secondary);
    margin-bottom: 0.25rem;
}

.level-status {
    font-size: 0.7rem;
    color: var(--text-dim);
}

.level-card.completed .level-status {
    color: var(--quantum-success);
}

/* Inline button style for use in messages */
.inline-button {
    display: inline-block;
    background: var(--bg-panel);
    border: 1px solid var(--quantum-primary);
    color: var(--quantum-primary);
    padding: 0.25rem 0.5rem;
    border-radius: 4px;
    font-weight: 600;
    transition: all var(--transition-fast);
    cursor: pointer;
}

.inline-button:hover {
    background: rgba(0, 255, 255, 0.1);
    box-shadow: 0 0 8px rgba(0, 255, 255, 0.3);
}

/* ============================================
   Floating Action Buttons (Inline in Header)
   ============================================ */

.fab-container-inline {
    display: flex;
    flex-direction: row;
    gap: 0.5rem;
    margin: 0 auto;
}

.fab-inline {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background: var(--bg-darker);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
    transition: all var(--transition-fast);
}

.fab-inline:hover {
    border-color: var(--quantum-primary);
    background: rgba(0, 255, 255, 0.2);
    transform: scale(1.1);
    box-shadow: 0 0 15px rgba(0, 255, 255, 0.4);
}

/* ============================================
   Responsive Design
   ============================================ */

@media (max-width: 1200px) {
    .challenge-grid {
        grid-template-columns: 1fr;
        grid-template-rows: auto;
    }

    .terminal-panel {
        grid-column: 1;
        grid-row: 1;
        min-height: 300px;
    }

    .viz-panel {
        grid-column: 1;
        grid-row: 2;
        min-height: 200px;
    }

    .guide-panel {
        grid-column: 1;
        grid-row: 3;
        min-height: 250px;
    }

    .puzzle-panel {
        grid-column: 1;
        grid-row: 4;
        min-height: 200px;
    }
}

@media (max-width: 768px) {
    .challenge-container {
        padding: 0.5rem;
    }

    .challenge-title {
        font-size: 1.3rem;
    }

    .header-stats {
        gap: 1rem;
    }

    .stat-value {
        font-size: 1.2rem;
    }

    .fab-inline {
        width: 32px;
        height: 32px;
        font-size: 1rem;
    }
}

/* ============================================
   Utility Classes
   ============================================ */

.hidden {
    display: none !important;
}

.text-success {
    color: var(--quantum-success);
}

.text-error {
    color: var(--quantum-error);
}

.text-warning {
    color: var(--quantum-warning);
}

.text-primary {
    color: var(--quantum-primary);
}

.glow-text {
    text-shadow: 0 0 10px currentColor;
}

/* ============================================
   API Key Modal
   ============================================ */

.api-key-modal-body {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.api-key-description {
    font-size: 0.9rem;
    color: var(--text-secondary);
    line-height: 1.5;
}

.api-key-display {
    background: var(--bg-darker);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 1rem;
    display: flex;
    align-items: center;
    gap: 1rem;
}

.api-key-display code {
    flex: 1;
    color: var(--quantum-accent);
    font-family: 'Courier New', monospace;
    font-size: 0.9rem;
    word-break: break-all;
}

.copy-btn {
    background: var(--bg-panel);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    padding: 0.5rem 0.75rem;
    border-radius: 6px;
    cursor: pointer;
    transition: all var(--transition-fast);
    font-size: 1.2rem;
    flex-shrink: 0;
}

.copy-btn:hover {
    border-color: var(--quantum-success);
    background: rgba(0, 255, 0, 0.1);
}

.api-key-info {
    font-size: 0.85rem;
    color: var(--quantum-success);
    background: rgba(0, 255, 0, 0.1);
    padding: 0.75rem;
    border-radius: 6px;
    border-left: 3px solid var(--quantum-success);
}

.api-key-usage h3 {
    font-size: 0.95rem;
    color: var(--quantum-primary);
    margin-bottom: 0.75rem;
}

.api-key-usage pre {
    background: var(--bg-darker);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    padding: 1rem;
    overflow-x: auto;
    font-size: 0.75rem;
    line-height: 1.5;
}

.api-key-usage code {
    color: var(--text-primary);
    font-family: 'Courier New', monospace;
}

/* ============================================
   About Modal Styles
   ============================================ */

.modal-large {
    max-width: 900px;
}

.about-modal-body {
    padding: 1.5rem;
}

.about-intro {
    margin-bottom: 1.5rem;
    padding-bottom: 1.5rem;
    border-bottom: 1px solid var(--border-color);
}

.about-intro h3 {
    color: var(--quantum-primary);
    font-size: 1.15rem;
    margin-bottom: 1rem;
}

.about-intro p {
    color: var(--text-secondary);
    font-size: 0.82rem;
    line-height: 1.5;
    margin-bottom: 0.75rem;
}

.about-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.25rem;
    margin-bottom: 1.5rem;
}

.about-stat {
    text-align: center;
    padding: 1.25rem;
    background: var(--bg-darker);
    border: 1px solid var(--border-color);
    border-radius: 8px;
}

.stat-number {
    display: block;
    font-size: 2rem;
    font-weight: 700;
    color: var(--quantum-accent);
    margin-bottom: 0.5rem;
}

.stat-label {
    display: block;
    font-size: 0.72rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.difficulty-section {
    margin-bottom: 1.5rem;
    padding: 1.25rem;
    background: var(--bg-darker);
    border: 1px solid var(--border-color);
    border-radius: 8px;
}

.difficulty-section h3 {
    font-size: 1rem;
    margin-bottom: 0.5rem;
}

.section-time {
    color: var(--text-dim);
    font-size: 0.72rem;
    margin-bottom: 1rem;
    font-style: italic;
}

.level-list {
    display: flex;
    flex-direction: column;
    gap: 0.65rem;
}

.level-item {
    display: flex;
    align-items: flex-start;
    gap: 0.85rem;
    padding: 0.65rem;
    background: var(--bg-panel);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    transition: all var(--transition-fast);
}

.level-item:hover {
    border-color: var(--quantum-primary);
    background: rgba(0, 255, 255, 0.05);
}

.level-item .level-number {
    flex-shrink: 0;
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-darker);
    border: 1px solid var(--quantum-primary);
    border-radius: 50%;
    font-size: 0.71rem;
    font-weight: 700;
    color: var(--quantum-primary);
}

.level-info {
    flex: 1;
}

.level-info h4 {
    color: var(--text-primary);
    font-size: 0.82rem;
    margin-bottom: 0.25rem;
}

.level-info p {
    color: var(--text-dim);
    font-size: 0.7rem;
    line-height: 1.4;
}

.about-footer {
    margin-top: 1.5rem;
    padding-top: 1.5rem;
    border-top: 1px solid var(--border-color);
    text-align: center;
}

.about-footer h3 {
    color: var(--quantum-success);
    font-size: 1rem;
    margin-bottom: 1rem;
}

.about-footer p {
    color: var(--text-secondary);
    font-size: 0.8rem;
    line-height: 1.5;
    margin-bottom: 0.75rem;
}

.good-luck {
    font-size: 0.92rem;
    font-weight: 600;
    color: var(--quantum-accent);
    margin-top: 1rem;
}
code {
  white-space: pre-wrap;
}

.solution-code {
  white-space: pre-wrap;
  display: block;
  margin: 0.5rem 0;
}