/* Reset and base styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--bg-color);
    transition: background-color 0.3s ease, color 0.3s ease;
}

/* CSS Variables for theming */
:root {
    --bg-color: #ffffff;
    --text-color: #333333;
    --accent-color: #007bff;
    --success-color: #28a745;
    --warning-color: #ffc107;
    --error-color: #dc3545;
    --border-color: #e0e0e0;
    --slot-bg: #f8f9fa;
    --item-bg: #ffffff;
    --shadow: 0 2px 4px rgba(0,0,0,0.1);
    --shadow-hover: 0 4px 8px rgba(0,0,0,0.15);
}

[data-theme="dark"] {
    --bg-color: #1a1a1a;
    --text-color: #ffffff;
    --accent-color: #4dabf7;
    --success-color: #51cf66;
    --warning-color: #ffd43b;
    --error-color: #ff6b6b;
    --border-color: #404040;
    --slot-bg: #2d2d2d;
    --item-bg: #1a1a1a;
    --shadow: 0 2px 4px rgba(0,0,0,0.3);
    --shadow-hover: 0 4px 8px rgba(0,0,0,0.4);
}

/* Container and layout */
.container {
    max-width: 400px;
    margin: 0 auto;
    height: 100vh;
    display: flex;
    flex-direction: column;
    padding: 0 16px;
    overflow: hidden;
}

header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 0;
    border-bottom: 1px solid var(--border-color);
    flex-shrink: 0;
}

h1 {
    font-size: 2rem;
    font-weight: 700;
    color: var(--accent-color);
}

.theme-toggle {
    background: none;
    border: 2px solid var(--border-color);
    border-radius: 50%;
    width: 40px;
    height: 40px;
    font-size: 1.2rem;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
}

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

/* Game container */
.game-container {
    flex: 1;
    padding: 15px 0;
    display: flex;
    flex-direction: column;
    min-height: 0;
}

.prompt-section {
    margin-bottom: 20px;
    text-align: center;
    flex-shrink: 0;
}

.prompt-section h2 {
    font-size: 1.3rem;
    font-weight: 600;
    line-height: 1.4;
    color: var(--text-color);
    text-wrap: balance;
    -webkit-text-wrap: balance;
}

/* Game grid */
.game-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
    flex: 1;
    min-height: 0;
}

.ranking-slots h3,
.items-column h3 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 15px;
    text-align: center;
    color: var(--text-color);
}

/* Ranking slots */
.ranking-slots {
    display: flex;
    flex-direction: column;
    gap: 8px;
    width: 100%;
}

.slot {
    display: flex;
    flex-direction: row;
    align-items: center;
    height: 50px;
    background-color: var(--slot-bg);
    border: 2px dashed var(--border-color);
    border-radius: 8px;
    padding: 6px;
    transition: all 0.3s ease;
    position: relative;
}

.slot.filled {
    border-style: solid;
    border-color: var(--accent-color);
    background-color: var(--item-bg);
}

.slot.drag-over {
    border-color: var(--accent-color);
    background-color: rgba(0, 123, 255, 0.1);
}

.rank-number {
    font-weight: 700;
    font-size: 1.1rem;
    color: var(--accent-color);
    margin-right: 12px;
    min-width: 20px;
    flex-shrink: 0;
}

.slot-content {
    flex: 1;
    height: 38px;
    display: flex;
    align-items: center;
    padding: 0;
    min-width: 0;
}

.slot-content .draggable-item {
    background-color: transparent;
    color: var(--text-color);
    border: 2px solid var(--border-color);
    padding: 4px 8px;
    border-radius: 4px;
    font-weight: 500;
    cursor: move;
    box-shadow: var(--shadow);
    transition: all 0.2s ease;
    width: 100% !important;
    height: 100% !important;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.75rem;
    min-width: 0;
    overflow: hidden;
    white-space: normal;
    text-align: center;
    line-height: 1.2;
    box-sizing: border-box;
    user-select: none;
    -webkit-user-select: none;
    -webkit-touch-callout: none;
    touch-action: none;
}

.slot-content .draggable-item:hover {
    box-shadow: var(--shadow-hover);
    transform: translateY(-1px);
    border-color: var(--accent-color);
}

/* Items column */
.items-column {
    display: flex;
    flex-direction: column;
}

.items-list {
    display: flex;
    flex-direction: column;
    gap: 8px;
    min-height: 282px;
    padding: 8px;
    border-radius: 8px;
    transition: all 0.3s ease;
    border: 2px solid transparent;
    position: relative;
}

.items-list.drag-over {
    background-color: rgba(0, 123, 255, 0.1);
    border: 2px dashed var(--accent-color);
}

.items-list:empty::before {
    content: "Drag items here to remove them from ranking";
    color: var(--text-color);
    opacity: 0.5;
    font-style: italic;
    text-align: center;
    padding: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    height: 100%;
    border: 2px dashed var(--border-color);
    border-radius: 8px;
    margin: 8px;
}

.draggable-item {
    background-color: var(--item-bg);
    border: 2px solid var(--border-color);
    border-radius: 8px;
    padding: 8px;
    cursor: move;
    font-weight: 500;
    transition: all 0.3s ease;
    box-shadow: var(--shadow);
    user-select: none;
    -webkit-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
    -webkit-user-drag: element;
    -webkit-touch-callout: none;
    touch-action: none;
    height: 50px;
    display: flex;
    align-items: center;
    justify-content: center;
    white-space: normal;
    overflow: hidden;
    text-align: center;
    line-height: 1.2;
    font-size: 0.8rem;
}

.draggable-item:hover {
    box-shadow: var(--shadow-hover);
    transform: translateY(-2px);
    border-color: var(--accent-color);
}

.draggable-item.dragging {
    opacity: 0.5;
    transform: rotate(5deg);
    width: 100% !important;
}

.draggable-item.correct-placement {
    background-color: rgba(40, 167, 69, 0.5) !important;
    border-color: #28a745 !important;
    color: white !important;
}

.draggable-item.incorrect-placement {
    background-color: rgba(220, 53, 69, 0.5) !important;
    border-color: #dc3545 !important;
    color: white !important;
}

.correct-ranking-item {
    background-color: var(--accent-color) !important;
    color: white !important;
    border-color: var(--accent-color) !important;
    cursor: default !important;
    height: 50px !important;
    display: flex !important;
    align-items: center !important;
}

.correct-ranking-item:hover {
    transform: none !important;
    box-shadow: var(--shadow) !important;
}

/* Game controls */
.game-controls {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 15px;
    padding: 15px 0;
    flex-shrink: 0;
}

.refresh-btn {
    background-color: var(--border-color);
    color: var(--text-color);
    border: none;
    border-radius: 8px;
    padding: 12px;
    font-size: 1.2rem;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: var(--shadow);
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.refresh-btn:hover {
    background-color: var(--accent-color);
    color: white;
    transform: translateY(-2px);
    box-shadow: var(--shadow-hover);
}

.refresh-btn:active {
    transform: translateY(-2px) rotate(180deg);
    transition: transform 0.3s ease;
}

.submit-btn {
    background-color: var(--accent-color);
    color: white;
    border: none;
    border-radius: 8px;
    padding: 12px 24px;
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: var(--shadow);
}

.submit-btn:hover:not(:disabled) {
    background-color: #0056b3;
    transform: translateY(-2px);
    box-shadow: var(--shadow-hover);
}

.submit-btn:disabled {
    background-color: var(--border-color);
    cursor: not-allowed;
    opacity: 0.6;
}

/* Results container */
.results-container {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100vh;
    height: 100dvh; /* Dynamic viewport height for mobile */
    background-color: var(--bg-color);
    z-index: 1000;
    display: flex;
    flex-direction: column;
    padding: 0 16px;
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
}

.results-container.hidden {
    display: none;
}

.results-content {
    text-align: center;
    max-width: 400px;
    margin: 0 auto;
    flex: 1;
    display: flex;
    flex-direction: column;
    padding: 15px 0;
    min-height: 0;
}

.score-header {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 20px;
    margin-bottom: 20px;
}

.score-header h2 {
    font-size: 1.8rem;
    margin: 0;
    color: var(--accent-color);
}

.score-bubble {
    background: linear-gradient(135deg, var(--accent-color), var(--success-color));
    border-radius: 12px;
    padding: 6px 16px;
    box-shadow: var(--shadow-hover);
}

.score-bubble span {
    font-size: 1.5rem;
    font-weight: 700;
    color: white;
}

.ranking-comparison {
    margin-bottom: 20px;
    background-color: var(--slot-bg);
    padding: 15px;
    border-radius: 8px;
    border: 1px solid var(--border-color);
    flex-shrink: 0;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
}

.ranking-column {
    text-align: left;
}

.ranking-column h3 {
    margin-bottom: 15px;
    text-align: center;
    color: var(--text-color);
    font-size: 0.95rem;
}

.ranking-column ol {
    list-style: none;
    counter-reset: ranking;
}

.ranking-column li {
    counter-increment: ranking;
    padding: 6px 0;
    border-bottom: 1px solid var(--border-color);
    position: relative;
    padding-left: 30px;
    font-size: 0.9rem;
}

.ranking-column li:last-child {
    border-bottom: none;
}

#user-ranking li::before {
    content: counter(ranking);
    position: absolute;
    left: 0;
    top: 6px;
    color: white;
    width: 18px;
    height: 18px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.8rem;
    font-weight: 600;
}

#user-ranking li.correct::before {
    background-color: var(--success-color);
}

#user-ranking li.incorrect::before {
    background-color: var(--error-color);
}

#correct-ranking li::before {
    content: counter(ranking);
    position: absolute;
    left: 0;
    top: 6px;
    background-color: var(--accent-color);
    color: white;
    width: 18px;
    height: 18px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.8rem;
    font-weight: 600;
}

/* Stats */
.stats {
    margin-bottom: 20px;
    flex-shrink: 0;
}

.stats h3 {
    margin-bottom: 15px;
    color: var(--text-color);
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 15px;
}

.stat {
    text-align: center;
    padding: 15px;
    background-color: var(--slot-bg);
    border-radius: 8px;
    border: 1px solid var(--border-color);
}

.stat-number {
    display: block;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--accent-color);
    margin-bottom: 5px;
}

.stat-label {
    font-size: 0.9rem;
    color: var(--text-color);
    opacity: 0.8;
}

/* Share section */
.share-section {
    display: flex;
    flex-direction: column;
    gap: 12px;
    flex-shrink: 0;
    padding-bottom: 20px;
}

.share-btn,
.play-again-btn {
    padding: 12px 24px;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: var(--shadow);
}

.share-btn {
    background-color: var(--success-color);
    color: white;
}

.share-btn:hover {
    background-color: #218838;
    transform: translateY(-2px);
    box-shadow: var(--shadow-hover);
}

.play-again-btn {
    background-color: var(--border-color);
    color: var(--text-color);
}

.play-again-btn:hover {
    background-color: var(--accent-color);
    color: white;
    transform: translateY(-2px);
    box-shadow: var(--shadow-hover);
}

/* Footer */
footer {
    text-align: center;
    padding: 10px 0;
    border-top: 1px solid var(--border-color);
    color: var(--text-color);
    opacity: 0.7;
    font-size: 0.8rem;
    flex-shrink: 0;
}

/* Responsive adjustments */
@media (max-width: 480px) {
    .container {
        padding: 0 12px;
    }
    
    .game-grid {
        gap: 10px;
    }
    
    .slot {
        min-height: 45px;
    }
    
    .draggable-item {
        padding: 10px;
    }
    
    .stats-grid {
        gap: 10px;
    }
    
    .stat {
        padding: 12px;
    }
}

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

.results-container:not(.hidden) {
    animation: fadeIn 0.5s ease-out;
}

/* Drag and drop visual feedback */
.dragging {
    opacity: 0.5;
    transform: rotate(5deg) scale(1.05);
}

.drag-over {
    background-color: rgba(0, 123, 255, 0.1) !important;
    border-color: var(--accent-color) !important;
}