:root {
    --bg-color: #fcfbf9;
    --text-primary: #222222;
    --text-secondary: #666666;
    --accent-color: #9d8c70;
    --accent-hover: #bdae93;
    --card-bg: #ffffff;
    --gap-color: rgba(157, 140, 112, 0.15);
    --gap-hover: rgba(157, 140, 112, 0.4);
    --success: #4a7c59;
    --error: #c84b31;
    --font-heading: 'Playfair Display', serif;
    --font-body: 'Inter', sans-serif;
}

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

body {
    font-family: var(--font-body);
    background-color: var(--bg-color);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
}

h1, h2, h3 {
    font-family: var(--font-heading);
    font-weight: 600;
}

#app {
    max-width: 1200px;
    margin: 0 auto;
    padding: 1rem 2rem;
    height: 100vh;
    display: flex;
    flex-direction: column;
}

.screen {
    display: none;
    flex: 1;
    flex-direction: column;
    overflow: hidden;
    min-height: 0;
}

.screen.active {
    display: flex;
}

/* START SCREEN */
#start-screen {
    justify-content: center;
    align-items: center;
    text-align: center;
}

#start-screen h1 {
    font-size: 5rem;
    margin-bottom: 1rem;
    color: var(--text-primary);
    letter-spacing: -0.02em;
}

#start-screen p {
    font-size: 1.2rem;
    color: var(--text-secondary);
    max-width: 500px;
    margin-bottom: 3rem;
}

.settings {
    margin-bottom: 2.5rem;
    width: 100%;
    max-width: 800px;
}

.settings-container {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    max-width: 800px;
    margin: 0 auto 2rem auto;
}

.settings-card {
    background: rgba(255, 255, 255, 0.95);
    padding: 2rem;
    border-radius: 16px;
    box-shadow: 0 8px 30px rgba(0,0,0,0.06);
    border: 1px solid rgba(255,255,255,0.4);
    backdrop-filter: blur(10px);
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.settings-card h2 {
    font-size: 1.3rem;
    color: var(--text-color);
    margin-bottom: 0.5rem;
    border-bottom: 2px solid #f0f0f0;
    padding-bottom: 0.5rem;
}

.primary-card {
    border-top: 4px solid var(--accent-color);
}

.advanced-card {
    background: rgba(249, 250, 251, 0.9);
}

.card-hint {
    font-size: 0.85rem;
    color: #e67e22;
    margin-top: -1rem;
    margin-bottom: 0.5rem;
}

.setting-group {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
}

.settings select, .settings-input {
    padding: 0.5rem 1rem;
    font-family: var(--font-body);
    font-size: 1rem;
    border: 1px solid #ddd;
    border-radius: 4px;
    background: white;
    width: 100%;
    max-width: 300px;
}

.difficulty-buttons {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
    justify-content: center;
}

.diff-btn, .cat-btn, .cat-btn-eu, .type-btn, .filter-btn, .museum-btn {
    background-color: white;
    border: 1px solid #ddd;
    padding: 0.6rem 1.2rem;
    border-radius: 20px;
    cursor: pointer;
    font-family: var(--font-body);
    font-size: 0.9rem;
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    color: var(--text-secondary);
    box-shadow: 0 2px 5px rgba(0,0,0,0.02);
}

.diff-btn:hover, .cat-btn:hover, .cat-btn-eu:hover, .type-btn:hover, .filter-btn:hover, .museum-btn:hover {
    border-color: var(--accent-color);
    transform: translateY(-2px) scale(1.02);
    box-shadow: 0 4px 10px rgba(0,0,0,0.08);
}

.diff-btn.active, .cat-btn.active, .cat-btn-eu.active, .type-btn.active, .filter-btn.active, .museum-btn.active {
    background-color: var(--accent-color);
    color: white;
    border-color: var(--accent-color);
    box-shadow: 0 4px 15px rgba(44, 62, 80, 0.2);
}

.primary-btn {
    background-color: var(--accent-color);
    color: white;
    border: none;
    padding: 1rem 2.5rem;
    font-size: 1.1rem;
    font-family: var(--font-body);
    font-weight: 600;
    border-radius: 30px;
    cursor: pointer;
    transition: background-color 0.3s ease, transform 0.2s ease;
}

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

/* GAME SCREEN */
header {
    display: flex;
    justify-content: space-between;
    padding-bottom: 1rem;
    border-bottom: 1px solid #eee;
    margin-bottom: 2rem;
    font-weight: 600;
    font-size: 1.1rem;
}

main {
    display: flex;
    flex-direction: column;
    align-items: center;
    flex: 1;
    min-height: 0;
}

#active-card-section {
    display: flex;
    flex-direction: row;
    justify-content: center;
    align-items: stretch;
    gap: 2rem;
    margin-bottom: 1rem;
    width: 100%;
    max-width: 1200px;
    flex: 1;
    min-height: 0;
}

.card {
    background: var(--card-bg);
    border-radius: 8px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.08);
    overflow: hidden;
    transition: transform 0.3s ease;
    flex-shrink: 0;
    display: flex;
    flex-direction: column;
}

.timeline-card {
    width: 160px;
    border: 1px solid #eee;
}

.timeline-card .card-details {
    padding: 0.75rem;
}

.timeline-card .card-details h3 {
    font-size: 0.85rem;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.timeline-card .card-details p {
    font-size: 0.75rem;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.timeline-card .card-details .year {
    font-size: 0.9rem;
}

.card-image-container {
    width: 100%;
    flex: 1;
    min-height: 80px;
    background: #f0f0f0;
    display: flex;
    justify-content: center;
    align-items: center;
    overflow: hidden;
}

.card-image-container img {
    width: 100%;
    height: 100%;
    object-fit: contain;
}

#active-card {
    width: auto;
    min-width: 250px;
    max-width: 450px;
    max-height: 55vh;
    flex: 1;
}

.zoomable-img {
    cursor: zoom-in;
    transition: transform 0.2s ease;
}

.zoomable-img:hover {
    transform: scale(1.03);
}

.card-details {
    padding: 1.5rem;
    text-align: center;
    border-top: 1px solid #f0f0f0;
}

.card-details h3 {
    font-size: 1.2rem;
    margin-bottom: 0.5rem;
}

.card-details p {
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.card-details .year {
    font-weight: 600;
    color: var(--accent-color);
    margin-top: 0.5rem;
    font-size: 1.1rem;
}

.hidden {
    display: none !important;
}

#interaction-panel {
    flex: 1;
    display: flex;
    flex-direction: column;
    justify-content: center;
    min-width: 350px;
    max-width: 600px;
}

.bonus-section {
    background: #f9f9f9;
    padding: 1.5rem;
    border-radius: 8px;
    width: 100%;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.bonus-section h3 {
    margin-bottom: 0.5rem;
    font-size: 1.1rem;
}

.bonus-section .hint {
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-bottom: 1rem;
}

.bonus-section input {
    width: 100%;
    padding: 0.75rem;
    margin-bottom: 0.5rem;
    border: 1px solid #ddd;
    border-radius: 4px;
    font-family: var(--font-body);
}

.bonus-section .instruction {
    margin-top: 1rem;
    font-weight: 600;
    color: var(--accent-color);
}

#feedback-area {
    text-align: center;
    background: white;
    padding: 1.5rem;
    border-radius: 8px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.05);
    width: 100%;
    margin: auto 0;
    max-height: 100%;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

#trivia-section, #did-you-know-section {
    background: #f0f7ff;
    padding: 0.75rem;
    border-radius: 6px;
    margin: 0.5rem 0;
    text-align: left;
    border-left: 4px solid var(--accent-color);
    flex: 1;
    min-height: 0;
    overflow-y: auto;
}

#did-you-know-section {
    background: #fff8eb;
    border-left: 4px solid #f39c12;
}

#trivia-section h3, #did-you-know-section h3 {
    font-size: 1rem;
    margin-bottom: 0.5rem;
    color: var(--accent-color);
}

#did-you-know-section h3 {
    color: #e67e22;
}

#trivia-section p, #did-you-know-section p {
    font-size: 0.9rem;
    color: var(--text-secondary);
    line-height: 1.4;
}

#feedback-message {
    font-size: 2rem;
    margin-bottom: 1rem;
}

#feedback-message.success { color: var(--success); }
#feedback-message.error { color: var(--error); }

#bonus-feedback {
    list-style: none;
    margin-bottom: 1.5rem;
    text-align: left;
}

#bonus-feedback li {
    padding: 0.5rem 0;
    border-bottom: 1px solid #eee;
}

/* TIMELINE */
#timeline-section {
    width: 100%;
    max-width: 100%;
    margin-top: 0.5rem;
    box-sizing: border-box;
    padding: 0 1rem;
    flex-shrink: 0;
}

#timeline-section h2 {
    text-align: center;
    margin-bottom: 2rem;
    color: var(--text-secondary);
    font-weight: 400;
}

.timeline {
    display: flex;
    flex-wrap: nowrap;
    overflow-x: auto;
    padding: 0.5rem 0 1rem 0;
    align-items: flex-start;
    justify-content: flex-start;
    gap: 0;
    min-height: 200px;
    width: 100%;
}

/* Scrollbar styling for timeline */
.timeline::-webkit-scrollbar {
    height: 8px;
}
.timeline::-webkit-scrollbar-track {
    background: #f1f1f1; 
    border-radius: 4px;
}
.timeline::-webkit-scrollbar-thumb {
    background: #ccc; 
    border-radius: 4px;
}
.timeline::-webkit-scrollbar-thumb:hover {
    background: #999; 
}

.timeline-gap {
    width: 40px;
    min-width: 20px;
    flex-basis: 40px;
    height: 200px;
    flex-shrink: 1;
    display: flex;
    justify-content: center;
    align-items: center;
    cursor: pointer;
    position: relative;
    transition: all 0.2s ease;
}

.timeline-gap::after {
    content: '';
    width: 4px;
    height: 100%;
    background-color: var(--gap-color);
    border-radius: 2px;
    transition: all 0.2s ease;
}

.timeline-gap::before {
    content: '+';
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    width: 32px;
    height: 32px;
    background-color: var(--accent-color);
    color: white;
    border-radius: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 1.5rem;
    font-weight: 400;
    z-index: 10;
    transition: all 0.2s ease;
    box-shadow: 0 4px 10px rgba(0,0,0,0.1);
}

.timeline-gap:hover::before {
    transform: translateY(-50%) scale(1.15);
    background-color: var(--accent-hover);
}

.timeline-gap:hover::after {
    background-color: var(--accent-color);
    width: 8px;
    box-shadow: 0 0 10px rgba(157, 140, 112, 0.4);
}

.timeline-card {
    flex-shrink: 1;
    flex-basis: 350px;
    min-width: 150px;
    margin: 0;
    transform: scale(1);
    transition: all 0.3s ease;
}

.timeline-card .card-image-container {
    height: 180px;
    flex: none;
}

.shake {
    animation: shake 0.5s cubic-bezier(.36,.07,.19,.97) both;
}

@keyframes shake {
    10%, 90% { transform: translate3d(-1px, 0, 0); }
    20%, 80% { transform: translate3d(2px, 0, 0); }
    30%, 50%, 70% { transform: translate3d(-4px, 0, 0); }
    40%, 60% { transform: translate3d(4px, 0, 0); }
}

/* END SCREEN */
#end-screen {
    justify-content: center;
    align-items: center;
    text-align: center;
}

#end-screen h1 {
    font-size: 4rem;
    margin-bottom: 1rem;
}

.final-score {
    font-size: 5rem;
    font-family: var(--font-heading);
    color: var(--accent-color);
    margin: 1rem 0;
}

.score-breakdown {
    background: white;
    padding: 2rem;
    border-radius: 8px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.05);
    margin-bottom: 2rem;
    text-align: left;
    width: 100%;
    max-width: 400px;
}

.score-breakdown p {
    display: flex;
    justify-content: space-between;
    margin-bottom: 0.5rem;
    border-bottom: 1px solid #eee;
    padding-bottom: 0.5rem;
}

/* LOADING OVERLAY */
#loading-overlay {
    position: fixed;
    top: 0; left: 0; right: 0; bottom: 0;
    background: rgba(255,255,255,0.9);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    z-index: 1000;
}

.spinner {
    display: none;
}

#art-spinner {
    width: 120px;
    height: 120px;
    margin-bottom: 1.5rem;
    display: flex;
    justify-content: center;
    align-items: center;
    position: relative;
}

#art-spinner svg {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    opacity: 0;
}

#art-spinner svg.active {
    opacity: 1;
}

#art-spinner path {
    fill: none;
    stroke: var(--accent-color);
    stroke-width: 4;
    stroke-linecap: round;
    stroke-linejoin: round;
    stroke-dasharray: 100;
    stroke-dashoffset: 100;
}

#art-spinner svg.active path {
    animation: draw-and-erase 2.5s cubic-bezier(0.4, 0, 0.2, 1) forwards;
}

@keyframes draw-and-erase {
    0% {
        stroke-dashoffset: 100;
    }
    45% {
        stroke-dashoffset: 0;
    }
    55% {
        stroke-dashoffset: 0;
    }
    100% {
        stroke-dashoffset: -100;
    }
}

/* GALLERY STYLES */
.gallery-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: 1.5rem;
    padding: 1rem;
    width: 100%;
}

.gallery-card {
    background: white;
    border-radius: 8px;
    box-shadow: 0 4px 10px rgba(0,0,0,0.05);
    overflow: hidden;
    display: flex;
    flex-direction: column;
}

.gallery-card img {
    width: 100%;
    height: 200px;
    object-fit: contain;
    background: #f9f9f9;
}

.gallery-details {
    padding: 1rem;
    text-align: center;
}

.gallery-details h3 { font-size: 1rem; margin-bottom: 0.25rem; }
.gallery-details p { font-size: 0.85rem; color: var(--text-secondary); }
.gallery-details .year { font-weight: 600; color: var(--accent-color); }

/* FLOATING REPORT BUTTON */
.report-btn {
    position: fixed;
    bottom: 20px;
    right: 20px;
    background-color: var(--text-primary);
    color: white;
    border: none;
    padding: 10px 15px;
    border-radius: 30px;
    font-family: var(--font-body);
    font-size: 0.9rem;
    cursor: pointer;
    box-shadow: 0 4px 10px rgba(0,0,0,0.2);
    z-index: 100;
    transition: transform 0.2s ease;
}

.report-btn:hover {
    transform: scale(1.05);
}

/* MODALS */
.modal {
    position: fixed;
    top: 0; left: 0; right: 0; bottom: 0;
    background: rgba(0,0,0,0.5);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 2000;
}

.modal-content {
    background: white;
    padding: 2rem;
    border-radius: 12px;
    width: 90%;
    max-width: 500px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.2);
}

.modal-content h2 { margin-bottom: 0.5rem; }
.modal-content p { margin-bottom: 1rem; font-size: 0.9rem; color: var(--text-secondary); }

.modal-content textarea {
    width: 100%;
    padding: 0.75rem;
    font-family: var(--font-body);
    border: 1px solid #ccc;
    border-radius: 4px;
    margin-bottom: 1rem;
    resize: vertical;
}

.modal-actions {
    display: flex;
    justify-content: flex-end;
    gap: 1rem;
}

.secondary-btn {
    background: transparent;
    border: 1px solid #ccc;
    padding: 0.5rem 1rem;
    border-radius: 4px;
    cursor: pointer;
    font-family: var(--font-body);
}

.secondary-btn:hover { background: #f0f0f0; }

/* ZOOM MODAL */
.zoom-modal {
    position: fixed;
    top: 0; left: 0; right: 0; bottom: 0;
    background: rgba(0,0,0,0.9);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 3000;
}

.zoom-modal img {
    max-width: 95vw;
    max-height: 95vh;
    object-fit: contain;
    border-radius: 4px;
}

.close-zoom {
    position: absolute;
    top: 20px;
    right: 30px;
    color: white;
    font-size: 40px;
    font-weight: bold;
    cursor: pointer;
    transition: 0.2s;
}

.close-zoom:hover { color: #ccc; }