html {
    height: 100%;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: #000000; /* Black background */
    color: #ffffff; /* White text globally */
    margin: 0;
    padding: 0;
    display: flex;
    flex-direction: column;
    min-height: 100vh; /* Ensure body takes full viewport height */
}

header {
    width: 100%;
    background-color: #000000; /* Match body background */
    padding: 20px 0; /* Increased padding */
    text-align: center;
    border-bottom: none; /* Remove border */
    /* margin-bottom will be handled by flex layout if needed or removed */
}

header h1 {
    margin: 0;
    color: #ffffff; /* White title text */
    font-size: 2em; /* Larger title */
}

.game-layout {
    display: flex;
    flex-grow: 1; /* Allow game layout to fill remaining vertical space */
    gap: 30px; /* Space between panels */
    padding: 30px; /* Overall padding for the game area */
    width: 100%;
    max-width: 1800px; /* Max width for very large screens */
    box-sizing: border-box;
    margin: 0 auto;
}

#puzzle-preview-area {
    width: 350px; /* Slightly wider left panel */
    flex-shrink: 0;
    background-color: #ffffff; /* White background for left panel */
    color: #000000; /* Black text for left panel content */
    padding: 25px;
    border-radius: 20px; /* More rounded corners */
    display: flex;
    flex-direction: column;
    gap: 20px;
    overflow-y: auto;
    box-sizing: border-box;
    /* height: 100%; */ /* Rely on flex stretch */
}

#puzzle-preview-area h2 {
    margin-top: 0;
    color: #000000; /* Black title text */
    width: 100%;
    text-align: center;
    border-bottom: 1px solid #dddddd; /* Lighter border */
    padding-bottom: 15px;
    font-size: 1.4em;
}

#finished-puzzle-img {
    max-width: 100%;
    height: auto;
    border: 2px solid #cccccc; /* Lighter border for image */
    border-radius: 10px; /* More rounded */
    background-color: #f0f0f0; /* Slight off-white for contrast if image is transparent */
    margin-bottom: 15px;
    cursor: pointer; /* Indicate clickable */
    transition: opacity 0.2s ease;
}

#finished-puzzle-img:hover {
    opacity: 0.8;
}

#puzzle-nav {
    display: flex;
    justify-content: center; /* Center the navigation buttons */
    gap: 10px; /* Add a small gap between the buttons */
}

#puzzle-nav button {
    padding: 12px 25px;
    background-color: #333333; /* Dark gray buttons */
    color: white;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    font-size: 1em; /* Adjusted size */
    transition: background-color 0.3s ease;
}

#puzzle-nav button:hover {
    background-color: #555555; /* Lighter gray on hover */
}

#puzzle-container-wrapper {
    flex-grow: 1;
    display: flex;
    flex-direction: column;
    background-color: #1a1a1a; /* Very dark gray background for right panel */
    padding: 25px;
    border-radius: 20px; /* Match left panel rounding */
    border: 1px solid #ffffff; /* White border */
    position: relative;
    min-width: 0;
    box-sizing: border-box;
    /* height: 100%; */ /* Rely on flex stretch */
}

#puzzle-container {
    width: 100%; 
    flex-grow: 1;
    background-color: #0d0d0d; /* Even darker for puzzle area */
    border: 1px dashed #444444; /* Subtle dashed border */
    border-radius: 10px; /* Slightly rounded inner board */
    position: relative;
    overflow: hidden;
    padding: 15px;
    box-sizing: border-box;
}

/* #right-sidebar styles removed as the element is deleted */

#trash-can {
    position: absolute;
    bottom: 25px; 
    right: 25px; 
    width: 120px; 
    height: 120px; 
    cursor: pointer;
    z-index: 100; 
    transition: transform 0.2s ease;
    display: flex; 
    align-items: center; 
    justify-content: center; 
}

#trash-can:hover {
    transform: scale(1.1);
}

#trash-can.trash-hover {
    opacity: 0.7;
}

#trash-can .trash-emoji {
    font-size: 60px; /* Doubled emoji size */
    color: #ffffff;
    display: block; 
    margin: 0; 
    line-height: 1; 
}

#pieces-tray-wrapper {
    background-color: #f0f0f0; /* Light gray background for pieces tray area */
    padding: 20px;
    border-radius: 10px;
    border: 1px solid #dddddd;
    flex-grow: 1; 
    display: flex;
    flex-direction: column;
    margin-top: 10px; /* Add some space from nav if needed */
}

#pieces-tray-wrapper h2 {
    margin-top: 0;
    color: #000000; /* Black text for "Pieces" title */
    width: 100%;
    text-align: center;
    border-bottom: 1px solid #cccccc;
    padding-bottom: 10px;
    font-size: 1.2em;
}

#pieces-tray {
    display: flex;
    flex-wrap: wrap; 
    gap: 10px;
    padding: 10px;
    justify-content: center; /* Center pieces horizontally */
    overflow-y: auto; 
    flex-grow: 1; 
    background-color: #e0e0e0; /* Lighter gray for the tray itself */
    border-radius: 8px;
}

.puzzle-piece {
    max-width: 150px; /* Increased size */
    max-height: 150px; /* Increased size */
    margin: 5px;
    cursor: grab;
    transition: transform 0.2s ease-in-out, opacity 0.2s ease-in-out;
    border-radius: 8px; 
    background-color: transparent; /* PNG only */
    /* box-shadow: 0 2px 4px rgba(0,0,0,0.1); */ /* Removed shadow */
}

#drag-feedback {
    pointer-events: none;
    will-change: transform;
    transition: none;
    box-shadow: 0 5px 15px rgba(0,0,0,0.2);
    max-width: 150px;
    max-height: 150px;
}

#pieces-tray .puzzle-piece {
    max-width: 150px; /* Increased size for tray pieces */
    max-height: 150px; /* Increased size for tray pieces */
    /* box-shadow: 0 1px 3px rgba(0,0,0,0.1); */ /* Removed shadow */
}

.puzzle-piece:active {
    cursor: grabbing;
}

.selected-piece {
    filter: drop-shadow(0 0 6px rgba(255, 255, 255, 0.6));
    opacity: 1;
}

#pieces-tray .puzzle-piece {
    position: static !important; /* Override absolute positioning if applied by JS on clone */
    transform: rotate(0deg) !important; /* Reset rotation for tray pieces */
}

/* Image Modal Styles */
.modal {
    display: none;
    position: fixed;
    z-index: 9999;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    overflow: auto;
    background-color: rgba(0, 0, 0, 0.9);
    animation: fadeIn 0.3s;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

.modal-content {
    margin: auto;
    display: block;
    max-width: 90%;
    max-height: 90%;
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    animation: zoomIn 0.3s;
}

@keyframes zoomIn {
    from { transform: translate(-50%, -50%) scale(0.8); }
    to { transform: translate(-50%, -50%) scale(1); }
}

.modal-close {
    position: absolute;
    top: 20px;
    right: 40px;
    color: #ffffff;
    font-size: 45px;
    font-weight: bold;
    cursor: pointer;
    transition: color 0.3s ease;
    z-index: 10000;
}

.modal-close:hover,
.modal-close:focus {
    color: #cccccc;
}

/* Instructions Modal Styles */
.instructions-content {
    background-color: #ffffff;
    padding: 20px 30px;
    border-radius: 15px;
    max-width: 800px;
    max-height: 95vh;
    overflow-y: auto;
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    animation: slideDown 0.3s;
    color: #000000;
}

@keyframes slideDown {
    from { 
        transform: translate(-50%, -60%);
        opacity: 0;
    }
    to { 
        transform: translate(-50%, -50%);
        opacity: 1;
    }
}

.instructions-content h2 {
    margin-top: 0;
    color: #000000;
    text-align: center;
    border-bottom: 2px solid #333333;
    padding-bottom: 10px;
    margin-bottom: 12px;
    font-size: 1.8em;
    padding-top: 5px;
}

.instructions-body {
    line-height: 1.4;
    font-size: 0.95em;
}

.instructions-body ol {
    counter-reset: item;
    list-style-type: none;
    padding-left: 0;
}

.instructions-body ol > li {
    counter-increment: item;
    margin-bottom: 12px;
    position: relative;
    padding-left: 35px;
}

.instructions-body ol > li::before {
    content: counter(item) ".";
    position: absolute;
    left: 0;
    font-weight: bold;
    font-size: 1.1em;
    color: #333333;
}

.instructions-body strong {
    color: #000000;
    font-size: 1.05em;
}

.instructions-body p {
    margin: 4px 0;
    color: #333333;
}

.instructions-body ul {
    margin: 4px 0;
    padding-left: 20px;
}

.instructions-body ul li {
    margin: 3px 0;
    color: #333333;
}

.instructions-footer {
    margin-top: 12px;
    padding-top: 10px;
    border-top: 1px solid #dddddd;
    text-align: center;
    font-style: italic;
    color: #666666;
    font-size: 0.9em;
}

.instructions-close {
    color: #333333;
    top: 10px;
    right: 25px;
}

.instructions-close:hover,
.instructions-close:focus {
    color: #000000;
}

#game-title:hover {
    opacity: 0.8;
}