/* ===== CSS Variables ===== */
:root {
    --color-bg: #0a0a0f;
    --color-bg-panel: #1a1a2e;
    --color-text: #e0e0e0;
    --color-text-dim: #a0a0a0;
    --color-accent: #4a9eff;
    --color-accent-hover: #6bb0ff;
    --color-border: #2a2a3e;
    --color-progress: #4a9eff;
    --color-marker-active: #ffaa44;

    --panel-width: 360px;
    --font-size-base: 16px;
    --font-size-title: 1.5rem;
    --font-size-description: 1rem;

    --transition-fast: 0.2s ease;
    --transition-medium: 0.3s ease;
    --transition-slow: 0.5s ease;

    --z-intro: 2000;
    --z-loading: 1000;
    --z-panel: 100;
    --z-progress: 90;
    --z-hint: 80;
    --z-cta: 110;
    --z-accessibility: 120;
}

/* ===== Reset & Base ===== */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body, html {
    width: 100%;
    height: 100%;
    overflow: hidden;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Noto Sans KR', sans-serif;
    background-color: var(--color-bg);
    color: var(--color-text);
    font-size: var(--font-size-base);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* ===== Intro Screen ===== */
.intro-screen {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, var(--color-bg) 0%, #0f0f1a 50%, var(--color-bg-panel) 100%);
    z-index: var(--z-intro);
    transition: opacity 1s ease, visibility 1s ease;
}

.intro-screen.hidden {
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
}

#intro-starfield {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 1;
}

.intro-content {
    position: relative;
    z-index: 2;
    width: 100%;
    height: 100%;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    padding: 20px;
}

.intro-line {
    font-family: 'Noto Serif KR', serif;
    font-size: clamp(1.2rem, 3.5vw, 2rem);
    font-weight: 300;
    line-height: 1.8;
    text-align: center;
    color: var(--color-text);
    opacity: 0;
    position: absolute;
    max-width: 90%;
    letter-spacing: 0.05em;
    text-shadow: 0 0 30px rgba(74, 158, 255, 0.4), 0 0 60px rgba(74, 158, 255, 0.2);
}

.intro-line.emphasis {
    font-weight: 600;
    font-size: clamp(1.4rem, 4vw, 2.4rem);
    letter-spacing: 0.1em;
    color: var(--color-accent);
    text-shadow: 0 0 40px rgba(74, 158, 255, 0.6), 0 0 80px rgba(74, 158, 255, 0.3);
}

.intro-start-button {
    opacity: 0;
    padding: 18px 45px;
    font-size: clamp(1rem, 2.5vw, 1.3rem);
    font-family: 'Noto Serif KR', serif;
    font-weight: 400;
    color: #ffffff;
    background: linear-gradient(135deg, var(--color-accent) 0%, var(--color-accent-hover) 100%);
    border: 2px solid rgba(74, 158, 255, 0.3);
    border-radius: 50px;
    cursor: pointer;
    transition: all 0.4s ease;
    box-shadow: 0 10px 40px rgba(74, 158, 255, 0.4), 0 0 20px rgba(74, 158, 255, 0.2);
    letter-spacing: 0.1em;
    position: absolute;
    pointer-events: none;
}

.intro-start-button.visible {
    opacity: 1;
    pointer-events: auto;
}

.intro-start-button:hover {
    transform: translateY(-3px);
    box-shadow: 0 15px 50px rgba(74, 158, 255, 0.6), 0 0 30px rgba(74, 158, 255, 0.4);
    background: linear-gradient(135deg, var(--color-accent-hover) 0%, #8bc5ff 100%);
    border-color: rgba(107, 176, 255, 0.5);
}

.intro-start-button:active {
    transform: translateY(-1px);
}

@media (max-width: 768px) {
    .intro-line {
        max-width: 95%;
    }
}

/* ===== Loading Screen ===== */
.loading-screen {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, #0a0a0f 0%, #1a1a2e 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: var(--z-loading);
    transition: opacity var(--transition-slow), visibility var(--transition-slow);
}

.loading-screen.hidden {
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
}

.loading-content {
    text-align: center;
    max-width: 500px;
    padding: 2rem;
}

.loading-content h1 {
    font-size: 2rem;
    margin-bottom: 2rem;
    color: var(--color-accent);
    letter-spacing: 0.05em;
}

.loading-bar {
    width: 100%;
    height: 4px;
    background: var(--color-border);
    border-radius: 2px;
    overflow: hidden;
    margin-bottom: 1rem;
}

.loading-progress {
    height: 100%;
    background: linear-gradient(90deg, var(--color-accent), var(--color-accent-hover));
    width: 0%;
    transition: width var(--transition-fast);
}

.loading-text {
    color: var(--color-text-dim);
    font-size: 0.9rem;
}

/* ===== App Container ===== */
.app-container {
    width: 100%;
    height: 100%;
    position: relative;
    transition: opacity var(--transition-slow);
}

.app-container.hidden {
    opacity: 0;
    pointer-events: none;
}

/* ===== WebGL Canvas ===== */
.webgl-canvas {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    outline: none;
}

/* ===== Info Panel ===== */
.info-panel {
    position: fixed;
    top: 0;
    right: 0;
    width: var(--panel-width);
    height: 100%;
    background: var(--color-bg-panel);
    border-left: 1px solid var(--color-border);
    z-index: var(--z-panel);
    display: flex;
    flex-direction: column;
    transition: transform var(--transition-medium);
    overflow-y: auto;
}

.info-panel.closed {
    transform: translateX(calc(var(--panel-width) - 40px));
}

.panel-toggle {
    position: absolute;
    top: 50%;
    left: -40px;
    transform: translateY(-50%);
    width: 40px;
    height: 80px;
    background: var(--color-bg-panel);
    border: 1px solid var(--color-border);
    border-right: none;
    border-radius: 8px 0 0 8px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-text);
    font-size: 1.2rem;
    transition: background var(--transition-fast);
}

.panel-toggle:hover {
    background: var(--color-border);
}

.panel-toggle .toggle-icon {
    transition: transform var(--transition-fast);
}

.info-panel.closed .toggle-icon {
    transform: rotate(180deg);
}

.panel-content {
    padding: 2rem 1.5rem;
    flex: 1;
}

.panel-title {
    font-size: var(--font-size-title);
    margin-bottom: 1rem;
    color: var(--color-accent);
    border-bottom: 2px solid var(--color-border);
    padding-bottom: 0.5rem;
}

.panel-description {
    font-size: var(--font-size-description);
    line-height: 1.8;
    white-space: pre-line;
}

.panel-description strong {
    color: var(--color-accent);
    font-weight: 600;
}

/* ===== Progress Bar ===== */
.progress-container {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    padding: 1.5rem 2rem;
    z-index: var(--z-progress);
    background: linear-gradient(to top, rgba(10, 10, 15, 0.9), transparent);
    pointer-events: none;
}

.progress-markers {
    display: flex;
    justify-content: space-between;
    position: relative;
    margin-bottom: 0.5rem;
}

.progress-marker {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
    position: relative;
    pointer-events: auto;
    cursor: pointer;
}

.marker-dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: var(--color-border);
    border: 2px solid var(--color-bg);
    transition: all var(--transition-medium);
    position: relative;
    z-index: 2;
}

.progress-marker.active .marker-dot {
    background: var(--color-marker-active);
    box-shadow: 0 0 12px var(--color-marker-active);
    animation: pulse 2s ease-in-out infinite;
}

.progress-marker.completed .marker-dot {
    background: var(--color-progress);
}

@keyframes pulse {
    0%, 100% { transform: scale(1); opacity: 1; }
    50% { transform: scale(1.2); opacity: 0.8; }
}

.marker-label {
    font-size: 0.75rem;
    color: var(--color-text-dim);
    white-space: nowrap;
    transition: color var(--transition-fast);
}

.progress-marker.active .marker-label {
    color: var(--color-marker-active);
    font-weight: 600;
}

.progress-marker.completed .marker-label {
    color: var(--color-progress);
}

.progress-line {
    width: 100%;
    height: 4px;
    background: var(--color-border);
    border-radius: 2px;
    overflow: hidden;
    position: relative;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--color-progress), var(--color-accent-hover));
    width: 0%;
    transition: width var(--transition-medium);
}

/* ===== Controls Hint ===== */
.controls-hint {
    position: fixed;
    bottom: 120px;
    left: 50%;
    transform: translateX(-50%);
    background: rgba(26, 26, 46, 0.9);
    padding: 1rem 1.5rem;
    border-radius: 8px;
    border: 1px solid var(--color-border);
    z-index: var(--z-hint);
    transition: opacity var(--transition-slow);
    pointer-events: none;
}

.controls-hint.hidden {
    opacity: 0;
}

.hint-content {
    font-size: 0.9rem;
    color: var(--color-text-dim);
}

.hint-mobile {
    display: none;
}

.hint-content strong {
    color: var(--color-text);
}

/* ===== Tutorial Container ===== */
.tutorial-container {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background: linear-gradient(135deg, rgba(26, 26, 46, 0.98), rgba(42, 42, 78, 0.98));
    border: 3px solid var(--color-accent);
    border-radius: 24px;
    padding: 3rem 2.5rem;
    max-width: 600px;
    width: 85%;
    z-index: 250;
    backdrop-filter: blur(20px);
    box-shadow: 0 15px 50px rgba(74, 158, 255, 0.4);
    transition: opacity var(--transition-medium), transform var(--transition-medium);
    text-align: center;
    pointer-events: auto;
    touch-action: none;
}

.tutorial-container.hidden {
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transform: translate(-50%, -50%) scale(0.9);
}

.tutorial-content {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    align-items: center;
}

.tutorial-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    width: 100%;
    margin-bottom: 0.5rem;
    position: relative;
}

.tutorial-badge {
    background: var(--color-accent);
    color: white;
    padding: 0.5rem 1.2rem;
    border-radius: 20px;
    font-size: 0.9rem;
    font-weight: 700;
    letter-spacing: 0.05em;
}

.tutorial-step {
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
    color: var(--color-text-dim);
    font-size: 1rem;
    font-weight: 600;
}

.tutorial-skip-btn {
    position: absolute;
    top: -1rem;
    right: -1rem;
    background: rgba(255, 70, 70, 0.9);
    color: white;
    border: none;
    width: 36px;
    height: 36px;
    border-radius: 50%;
    font-size: 1.5rem;
    line-height: 1;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    box-shadow: 0 4px 12px rgba(255, 70, 70, 0.4);
    z-index: 10;
}

.tutorial-skip-btn:hover {
    background: rgba(255, 50, 50, 1);
    transform: scale(1.1);
    box-shadow: 0 6px 18px rgba(255, 70, 70, 0.6);
}

.tutorial-skip-btn:active {
    transform: scale(0.95);
}

.tutorial-icon {
    font-size: 4rem;
    margin: 1rem 0;
    animation: tutorial-pulse 2s ease-in-out infinite;
}

@keyframes tutorial-pulse {
    0%, 100% {
        transform: scale(1);
        opacity: 1;
    }
    50% {
        transform: scale(1.1);
        opacity: 0.8;
    }
}

.tutorial-title {
    font-size: 2rem;
    color: var(--color-accent);
    margin: 0;
    letter-spacing: 0.05em;
    font-weight: 700;
}

.tutorial-text {
    font-size: 1.2rem;
    line-height: 1.8;
    color: var(--color-text);
}

.tutorial-instruction {
    font-size: 1.1rem;
    line-height: 1.8;
    color: #ffaa44;
    font-weight: 600;
    padding: 1.5rem 2rem;
    background: rgba(255, 170, 68, 0.15);
    border: 2px solid #ffaa44;
    border-radius: 12px;
    margin-top: 1rem;
}

.tutorial-skip-hint {
    font-size: 0.9rem;
    color: var(--color-text-dim);
    opacity: 0.7;
    margin-top: 0.5rem;
}

/* ===== Center Description Container ===== */
.center-description {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background: rgba(26, 26, 46, 0.98);
    border: 2px solid var(--color-accent);
    border-radius: 20px;
    padding: 3rem 2.5rem;
    max-width: 1000px;
    width: 85%;
    z-index: 200;
    backdrop-filter: blur(15px);
    box-shadow: 0 10px 40px rgba(74, 158, 255, 0.3);
    transition: opacity var(--transition-medium), transform var(--transition-medium);
    text-align: center;
    pointer-events: auto;
    touch-action: none; /* Allow gesture detection */
}

.center-description.hidden {
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transform: translate(-50%, -50%) scale(0.95);
}

.center-description-content {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    align-items: center;
}

.center-title {
    font-size: 2rem;
    color: var(--color-accent);
    margin: 0;
    letter-spacing: 0.05em;
}

.center-text {
    font-size: 1.2rem;
    line-height: 1.8;
    color: var(--color-text);
    white-space: pre-line;
}

.dismiss-btn {
    margin-top: 1rem;
    padding: 1rem 2.5rem;
    background: var(--color-accent);
    color: white;
    border: none;
    border-radius: 12px;
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    transition: all var(--transition-fast);
    box-shadow: 0 4px 15px rgba(74, 158, 255, 0.4);
}

.dismiss-btn:hover {
    background: var(--color-accent-hover);
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(74, 158, 255, 0.6);
}

.dismiss-icon {
    font-size: 1.3rem;
    animation: bounce 2s ease-in-out infinite;
}

@keyframes bounce {
    0%, 100% {
        transform: translateY(0);
    }
    50% {
        transform: translateY(5px);
    }
}

.gesture-hint {
    margin-top: 0.5rem;
    font-size: 0.9rem;
    color: var(--color-text-dim);
    opacity: 0.8;
}

/* ===== Quiz Container ===== */
.quiz-container {
    position: fixed !important;
    bottom: 100px !important;
    left: 30px !important;
    background: rgba(26, 26, 46, 0.95);
    border: 2px solid var(--color-border);
    border-radius: 16px;
    padding: 1.5rem;
    width: 500px !important;
    z-index: 150;
    backdrop-filter: blur(10px);
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.5);
    transition: opacity var(--transition-medium), transform var(--transition-medium);
    pointer-events: none; /* Allow touches to pass through to canvas */
    transform: none !important; /* 중앙정렬 transform 제거 */
}

.quiz-container.hidden {
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transform: translateY(20px);
}

.quiz-content {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    pointer-events: auto; /* Enable touches on quiz UI elements */
}

.quiz-question {
    font-size: 1.3rem;
    color: var(--color-accent);
    margin-bottom: 1rem;
    line-height: 1.4;
}

.quiz-options {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    margin-bottom: 1rem;
}

.quiz-option {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 1rem 1.25rem;
    background: rgba(255, 255, 255, 0.05);
    border: 2px solid rgba(74, 158, 255, 0.3);
    border-radius: 12px;
    cursor: pointer;
    transition: all 0.3s ease;
}

.quiz-option:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: rgba(74, 158, 255, 0.6);
}

.option-number {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-accent);
    min-width: 30px;
}

.option-text {
    font-size: 1.1rem;
    color: var(--color-text);
    line-height: 1.4;
}

.quiz-hint {
    font-size: 1.1rem;
    color: #ffaa44;
    font-weight: 500;
    padding: 1rem 1.5rem;
    background: rgba(255, 170, 68, 0.15);
    border: 2px solid #ffaa44;
    border-radius: 8px;
    text-align: center;
    animation: quiz-pulse 2s ease-in-out infinite;
}

@keyframes quiz-pulse {
    0%, 100% {
        transform: scale(1);
        opacity: 1;
    }
    50% {
        transform: scale(1.02);
        opacity: 0.9;
    }
}

.quiz-feedback {
    font-size: 1rem;
    padding: 0.75rem 1rem;
    border-radius: 8px;
    min-height: 2.5rem;
    display: flex;
    align-items: center;
    transition: all var(--transition-fast);
}

.quiz-feedback.correct {
    background: rgba(76, 175, 80, 0.2);
    border: 2px solid #4CAF50;
    color: #4CAF50;
}

.quiz-feedback.wrong {
    background: rgba(244, 67, 54, 0.2);
    border: 2px solid #f44336;
    color: #f44336;
}

.quiz-controls {
    display: flex;
    gap: 1rem;
    margin-top: 0.5rem;
}

.quiz-btn {
    flex: 1;
    padding: 0.75rem 1.5rem;
    background: var(--color-accent);
    color: white;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.quiz-btn:hover {
    background: var(--color-accent-hover);
    transform: translateY(-2px);
}

.quiz-btn.skip-btn {
    background: var(--color-border);
    color: var(--color-text);
}

.quiz-btn.skip-btn:hover {
    background: var(--color-text-dim);
}

/* ===== Season CTA ===== */
.season-cta {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background: rgba(26, 26, 46, 0.95);
    padding: 2rem;
    border-radius: 12px;
    border: 2px solid var(--color-accent);
    max-width: 500px;
    z-index: var(--z-cta);
    text-align: center;
    transition: opacity var(--transition-medium), transform var(--transition-medium);
}

.season-cta.hidden {
    opacity: 0;
    transform: translate(-50%, -50%) scale(0.9);
    pointer-events: none;
}

.cta-content h3 {
    font-size: 1.5rem;
    color: var(--color-accent);
    margin-bottom: 1rem;
}

.cta-content p {
    line-height: 1.8;
    margin-bottom: 1.5rem;
}

.cta-button {
    background: var(--color-accent);
    color: #fff;
    padding: 0.75rem 2rem;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.cta-button:hover {
    background: var(--color-accent-hover);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(74, 158, 255, 0.4);
}

/* ===== Accessibility Controls ===== */
.accessibility-controls {
    position: fixed;
    top: 1rem;
    left: 1rem;
    display: flex;
    gap: 0.5rem;
    z-index: var(--z-accessibility);
}

.accessibility-button {
    width: 40px;
    height: 40px;
    background: rgba(26, 26, 46, 0.9);
    border: 1px solid var(--color-border);
    border-radius: 8px;
    color: var(--color-text);
    font-size: 0.9rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.accessibility-button:hover {
    background: var(--color-border);
    transform: scale(1.05);
}

/* ===== Hand Gesture Panel ===== */
.hand-gesture-panel {
    position: fixed;
    top: 1rem;
    right: 1rem;
    z-index: var(--z-accessibility);
}

.gesture-toggle {
    width: 50px;
    height: 50px;
    background: rgba(26, 26, 46, 0.9);
    border: 2px solid var(--color-accent);
    border-radius: 50%;
    color: var(--color-text);
    font-size: 1.5rem;
    cursor: pointer;
    transition: all var(--transition-fast);
    display: flex;
    align-items: center;
    justify-content: center;
}

.gesture-toggle:hover {
    background: var(--color-accent);
    transform: scale(1.1);
}

.gesture-toggle.active {
    background: var(--color-accent);
    box-shadow: 0 0 20px var(--color-accent);
    animation: gesture-pulse 2s ease-in-out infinite;
}

@keyframes gesture-pulse {
    0%, 100% {
        box-shadow: 0 0 20px var(--color-accent);
    }
    50% {
        box-shadow: 0 0 30px var(--color-accent), 0 0 40px rgba(255, 199, 0, 0.5);
    }
}

.gesture-content {
    position: absolute;
    top: 60px;
    right: 0;
    width: 350px;
    background: rgba(26, 26, 46, 0.95);
    border: 1px solid var(--color-border);
    border-radius: 12px;
    padding: 1.5rem;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.5);
    transition: opacity var(--transition-medium), transform var(--transition-medium);
}

.gesture-content.hidden {
    opacity: 0;
    transform: translateY(-10px);
    pointer-events: none;
}

.gesture-content h3 {
    font-size: 1.2rem;
    color: var(--color-accent);
    margin-bottom: 1rem;
    border-bottom: 1px solid var(--color-border);
    padding-bottom: 0.5rem;
}

.gesture-content h4 {
    font-size: 1rem;
    color: var(--color-text);
    margin: 1rem 0 0.5rem 0;
}

.camera-select {
    margin-bottom: 1rem;
}

.camera-select label {
    display: block;
    margin-bottom: 0.5rem;
    font-size: 0.9rem;
    color: var(--color-text-dim);
}

.camera-select select {
    width: 100%;
    padding: 0.5rem;
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: 4px;
    color: var(--color-text);
    font-size: 0.9rem;
}

.gesture-status {
    margin-bottom: 1rem;
    padding: 0.75rem;
    background: var(--color-bg);
    border-radius: 4px;
}

.gesture-status p {
    margin: 0.25rem 0;
    font-size: 0.85rem;
    color: var(--color-text-dim);
}

.gesture-guide ul {
    list-style: none;
    padding: 0;
    margin: 0.5rem 0 1rem 0;
}

.gesture-guide li {
    padding: 0.5rem 0;
    font-size: 0.85rem;
    line-height: 1.4;
    border-bottom: 1px solid var(--color-border);
}

.gesture-guide li:last-child {
    border-bottom: none;
}

.gesture-guide strong {
    color: var(--color-accent);
}

.video-preview {
    margin-top: 1rem;
    border-radius: 8px;
    overflow: hidden;
    border: 1px solid var(--color-border);
}

.video-preview canvas {
    width: 100%;
    height: auto;
    display: block;
    background: #000;
}

/* ===== Utility Classes ===== */
.hidden {
    display: none !important;
}

/* ===== Responsive Design ===== */
@media (max-width: 768px) {
    :root {
        --panel-width: 100%;
    }

    .info-panel {
        width: 100%;
        height: auto;
        max-height: 50%;
        top: auto;
        bottom: 100px;
        border-left: none;
        border-top: 1px solid var(--color-border);
        border-radius: 12px 12px 0 0;
    }

    .info-panel.closed {
        transform: translateY(calc(100% - 60px));
    }

    .panel-toggle {
        top: -40px;
        left: 50%;
        transform: translateX(-50%);
        width: 80px;
        height: 40px;
        border-radius: 8px 8px 0 0;
        border-bottom: none;
        border-right: 1px solid var(--color-border);
    }

    .info-panel.closed .toggle-icon {
        transform: rotate(90deg);
    }

    .panel-toggle .toggle-icon {
        transform: rotate(-90deg);
    }

    .panel-content {
        padding: 1.5rem 1rem;
    }

    .progress-container {
        padding: 1rem;
        right: 0;
        left: 0;
    }

    .marker-label {
        font-size: 0.65rem;
    }

    .controls-hint {
        bottom: 200px;
        left: 1rem;
        right: 1rem;
        transform: none;
        padding: 0.75rem 1rem;
    }

    .hint-desktop {
        display: none;
    }

    .hint-mobile {
        display: block;
    }

    .season-cta {
        left: 1rem;
        right: 1rem;
        transform: translateY(-50%);
        padding: 1.5rem;
        max-width: none;
    }

    .season-cta.hidden {
        transform: translate(-50%, -50%) scale(0.9);
    }

    .accessibility-controls {
        top: 0.5rem;
        left: 0.5rem;
    }

    .accessibility-button {
        width: 36px;
        height: 36px;
        font-size: 0.8rem;
    }

    .quiz-container {
        max-width: 90%;
        padding: 1.5rem;
    }

    .quiz-question {
        font-size: 1.1rem;
    }

    .quiz-hint {
        font-size: 0.9rem;
    }

    .quiz-controls {
        flex-direction: column;
    }

    .center-description {
        width: 90%;
        padding: 2rem 1.5rem;
    }

    .center-title {
        font-size: 1.5rem;
    }

    .center-text {
        font-size: 1rem;
    }

    .dismiss-btn {
        padding: 0.75rem 2rem;
        font-size: 1rem;
    }
}

@media (max-width: 480px) {
    .panel-title {
        font-size: 1.2rem;
    }

    .panel-description {
        font-size: 0.9rem;
    }

    .progress-marker {
        gap: 0.3rem;
    }

    .marker-dot {
        width: 10px;
        height: 10px;
    }

    .marker-label {
        font-size: 0.6rem;
    }
}

/* ===== High Contrast Mode for Accessibility ===== */
@media (prefers-contrast: high) {
    :root {
        --color-bg: #000;
        --color-text: #fff;
        --color-border: #fff;
    }

    .marker-dot,
    .progress-line {
        border: 2px solid #fff;
    }
}

/* ===== Reduced Motion ===== */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* ===== Font Size Adjustments ===== */
body.font-size-large {
    --font-size-base: 18px;
    --font-size-title: 1.75rem;
    --font-size-description: 1.1rem;
}

body.font-size-small {
    --font-size-base: 14px;
    --font-size-title: 1.3rem;
    --font-size-description: 0.9rem;
}

/* ===== Focus Styles for Accessibility ===== */
button:focus-visible,
.progress-marker:focus-visible {
    outline: 2px solid var(--color-accent);
    outline-offset: 4px;
}

/* ===== Quiz Container ===== */
.quiz-container {
    position: fixed;
    bottom: 20px;
    left: 50%;
    transform: translateX(-50%);
    background: rgba(26, 26, 46, 0.95);
    border: 2px solid var(--color-border);
    border-radius: 16px;
    padding: 1.5rem;
    max-width: 600px;
    width: 90%;
    z-index: 150;
    backdrop-filter: blur(10px);
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.5);
    transition: opacity var(--transition-medium), transform var(--transition-medium);
    pointer-events: none; /* Allow touches to pass through to canvas */
}

.quiz-container.hidden {
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transform: translateX(-50%) translateY(20px);
}

.quiz-content {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    pointer-events: auto; /* Enable touches on quiz UI elements */
}

.quiz-question {
    font-size: 1.3rem;
    color: var(--color-accent);
    margin-bottom: 0.5rem;
    line-height: 1.4;
}

.quiz-hint {
    font-size: 1.1rem;
    color: #ffaa44;
    font-weight: 500;
    padding: 1rem 1.5rem;
    background: rgba(255, 170, 68, 0.15);
    border: 2px solid #ffaa44;
    border-radius: 8px;
    text-align: center;
    animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% {
        transform: scale(1);
        opacity: 1;
    }
    50% {
        transform: scale(1.02);
        opacity: 0.9;
    }
}

.quiz-feedback {
    font-size: 1rem;
    padding: 0.75rem 1rem;
    border-radius: 8px;
    min-height: 2.5rem;
    display: flex;
    align-items: center;
    transition: all var(--transition-fast);
}

.quiz-feedback.correct {
    background: rgba(76, 175, 80, 0.2);
    border: 2px solid #4CAF50;
    color: #4CAF50;
}

.quiz-feedback.wrong {
    background: rgba(244, 67, 54, 0.2);
    border: 2px solid #f44336;
    color: #f44336;
}

.quiz-controls {
    display: flex;
    gap: 1rem;
    margin-top: 0.5rem;
}

.quiz-btn {
    flex: 1;
    padding: 0.75rem 1.5rem;
    background: var(--color-accent);
    color: white;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.quiz-btn:hover {
    background: var(--color-accent-hover);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(74, 158, 255, 0.4);
}

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

.quiz-btn.skip-btn {
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid var(--color-border);
}

.quiz-btn.skip-btn:hover {
    background: rgba(255, 255, 255, 0.15);
}

/* ===== Responsive Quiz ===== */
@media (max-width: 768px) {
    .quiz-container {
        max-width: 90%;
        padding: 1.5rem;
    }

    .quiz-question {
        font-size: 1.1rem;
    }

    .quiz-hint {
        font-size: 0.9rem;
    }

    .quiz-controls {
        flex-direction: column;
    }
}

/* ===== Print Styles ===== */
@media print {
    .loading-screen,
    .controls-hint,
    .accessibility-controls,
    .quiz-container {
        display: none;
    }
}