/* Basic Styles & Variables */
:root {
    --bg-color: #f8f9fa;
    --text-color: #212529;
    --card-bg: #ffffff;
    --border-color: #dee2e6;
    --primary-color: #0d6efd;
    --secondary-color: #6c757d;
    --success-color: #198754;
    --warning-color: #ffc107;
    --info-color: #0dcaf0;
    --light-color: #f8f9fa;
    --dark-color: #212529;
    --navbar-bg: #e9ecef;
    --navbar-text: #343a40;
    --puzzle-border: #adb5bd;
    --piece-border: #6c757d;
    --piece-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
    --slot-bg: rgba(0, 0, 0, 0.05);
    --slot-hover-bg: rgba(0, 0, 0, 0.1);
    --slot-hint-bg: rgba(255, 255, 0, 0.5); /* Yellow hint */
    --win-modal-bg: linear-gradient(135deg, #a8e063, #56ab2f);
    --win-modal-text: #fff;
}

/* Dark Theme */
body.dark-theme {
    --bg-color: #2c3034; /* Darker gray */
    --text-color: #e9ecef; /* Light gray */
    --card-bg: #343a40;   /* Dark gray */
    --border-color: #495057; /* Medium gray */
    --primary-color: #4dabf7; /* Lighter blue */
    --secondary-color: #adb5bd; /* Light gray */
    --success-color: #40c057; /* Lighter green */
    --warning-color: #ffdd57; /* Lighter yellow */
    --info-color: #3bc9db;   /* Lighter cyan */
    --navbar-bg: #212529;   /* Very dark */
    --navbar-text: #f8f9fa;  /* White */
    --puzzle-border: #6c757d; /* Medium gray */
    --piece-border: #adb5bd; /* Light gray */
    --piece-shadow: 0 2px 4px rgba(255, 255, 255, 0.1);
    --slot-bg: rgba(255, 255, 255, 0.08);
    --slot-hover-bg: rgba(255, 255, 255, 0.15);
    --slot-hint-bg: rgba(255, 255, 100, 0.6); /* Lighter yellow hint */
    --win-modal-bg: linear-gradient(135deg, #4a00e0, #8e2de2); /* Purple gradient */
    --win-modal-text: #fff;
}

/* General Body Styling */
body {
    background-color: var(--bg-color);
    color: var(--text-color);
    transition: background-color 0.3s ease, color 0.3s ease;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

/* Navbar */
.navbar {
    background-color: var(--navbar-bg);
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
    transition: background-color 0.3s ease;
}
.navbar-brand, .nav-link {
    color: var(--navbar-text) !important;
}
.navbar-brand {
    font-weight: bold;
}
.btn-icon {
    background: none;
    border: none;
    color: var(--navbar-text);
    font-size: 1.2rem;
    padding: 0.375rem 0.75rem;
}
.btn-icon:hover {
    color: var(--primary-color);
}
.dark-theme .btn-icon:hover {
     color: var(--info-color);
}


/* Game Container Layout */
.game-container {
    flex-grow: 1; /* Takes remaining vertical space */
}

.controls-card {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    transition: background-color 0.3s ease, border-color 0.3s ease;
    height: 100%; /* Make cards in same row equal height */
}

.controls-column, .pieces-column, .puzzle-column {
    display: flex; /* Needed for height: 100% on child */
    flex-direction: column;
}

/* Puzzle Board & Pieces */
.puzzle-wrapper {
    position: relative; /* For preview image positioning */
    background-color: var(--card-bg);
    padding: 10px;
    border-radius: 5px;
    border: 1px solid var(--border-color);
    overflow: hidden; /* Contain elements */
    margin-bottom: 1rem; /* Space below board */
    aspect-ratio: 1 / 1; /* Maintain square aspect ratio, adjust if needed */
    max-width: 600px; /* Limit max width */
    margin-left: auto;
    margin-right: auto;
     width: 100%;
}

.puzzle-board-area {
    display: grid;
    width: 100%;
    height: 100%;
    position: relative; /* Context for absolutely positioned pieces */
    border: 2px dashed var(--puzzle-border);
    background-color: var(--slot-bg); /* Slight background for empty board */
    transition: background-color 0.3s ease, border-color 0.3s ease;
}

.puzzle-slot {
    border: 1px solid var(--puzzle-border);
    background-color: var(--slot-bg);
    transition: background-color 0.2s ease, border-color 0.3s ease;
    position: relative; /* For pseudo-elements if needed */
    overflow: hidden; /* Hide piece overflow initially */
}

.puzzle-slot.drag-over {
    background-color: var(--slot-hover-bg);
    border-style: dashed;
}

.puzzle-slot.hint-highlight {
    background-color: var(--slot-hint-bg) !important; /* Override other backgrounds */
    box-shadow: 0 0 10px 3px var(--slot-hint-bg);
    transition: background-color 0.1s ease-in-out, box-shadow 0.1s ease-in-out;
    z-index: 10; /* Ensure hint is visible */
}


.pieces-area {
    display: flex;
    flex-wrap: wrap;
    gap: 5px; /* Spacing between pieces */
    padding: 5px;
    border: 1px solid var(--border-color);
    border-radius: 5px;
    background-color: var(--bg-color);
    min-height: 100px; /* Ensure it has some height even when empty */
    align-content: flex-start; /* Align items to the top */
    max-height: 70vh; /* Prevent it from getting too tall */
    overflow-y: auto; /* <<< MAKE SURE THIS IS PRESENT for scrolling */
    overflow-x: hidden; /* Prevent horizontal scroll */
    touch-action: pan-y; /* <<< ADDED: Allow vertical scrolling on touch devices within this container */
}

/* Ensure desktop pieces column is visible */
@media (min-width: 992px) {
    .pieces-column.d-lg-block {
        display: flex !important; /* <<< More specific override if needed */
        flex-direction: column;
    }
     .pieces-column .pieces-area {
        max-height: calc(100vh - 200px); /* Adjust based on navbar/padding */
    }
    /* Hide mobile container on large screens */
    .pieces-container-mobile {
        display: none !important;
    }
}

/* Ensure mobile pieces container is hidden correctly on large screens */
@media (min-width: 992px) {
    .col-12.d-lg-none {
         display: none !important;
    }
}


.puzzle-piece {
    border: 1px solid var(--piece-border);
    background-size: cover; /* Scales image to cover the piece */
    cursor: grab;
    transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.3s ease, opacity 0.3s ease;
    box-shadow: var(--piece-shadow);
    position: relative; /* Needed for z-index */
    touch-action: none; /* Improve touch interactions */
    opacity: 1;
    z-index: 1; /* Default stacking */
}

.puzzle-piece:active {
    cursor: grabbing;
    transform: scale(1.05); /* Slightly enlarge when grabbing */
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
    z-index: 100; /* Bring to front when dragging */
}
.dark-theme .puzzle-piece:active {
    box-shadow: 0 4px 8px rgba(255, 255, 255, 0.2);
}

.puzzle-piece.dragging {
    opacity: 0.6; /* Make it semi-transparent while dragging */
    cursor: grabbing;
     z-index: 100; /* Keep on top */
}

.puzzle-piece.placed {
    /* Styles for pieces correctly placed on the board */
    cursor: default;
    border: none; /* Remove border once placed */
    box-shadow: none;
    /* Optional: Add smooth transition into place */
     transition: transform 0.3s cubic-bezier(0.18, 0.89, 0.32, 1.28), /* Snap animation */
                 opacity 0.3s ease;
}
.puzzle-piece.snapping {
    /* Temporary class for snap animation */
     transform: scale(1.1); /* Example pop */
     z-index: 50;
}


.placeholder-text {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    color: var(--secondary-color);
    text-align: center;
    padding: 20px;
}

.preview-image {
    position: absolute;
    top: 10px; /* Same as puzzle-wrapper padding */
    left: 10px;/* Same as puzzle-wrapper padding */
    width: calc(100% - 20px);
    height: calc(100% - 20px);
    object-fit: contain; /* Show the whole image */
    opacity: 0.15; /* Make it faint */
    pointer-events: none; /* Don't interfere with drag/drop */
    z-index: 0; /* Behind puzzle pieces */
}
.dark-theme .preview-image {
    opacity: 0.1; /* Even fainter on dark theme */
}


/* Gallery Modal */
.gallery-image {
    cursor: pointer;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
    border-radius: 4px;
    overflow: hidden; /* Ensure border-radius applies */
    border: 2px solid transparent;
}
.gallery-image img {
    display: block; /* Remove extra space below image */
    width: 100%;
    height: auto;
    aspect-ratio: 1 / 1; /* Make thumbnails square */
    object-fit: cover; /* Crop images nicely */
}
.gallery-image:hover {
    transform: scale(1.05);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
     border-color: var(--primary-color);
}
.dark-theme .gallery-image:hover {
     border-color: var(--info-color);
}

/* --- Enhanced Win Modal Styles --- */
/* Define the pulse animation */
@keyframes pulse {
    0% { transform: scale(1); box-shadow: 0 10px 25px rgba(0, 0, 0, 0.2); }
    50% { transform: scale(1.02); box-shadow: 0 15px 35px rgba(0, 0, 0, 0.3); }
    100% { transform: scale(1); box-shadow: 0 10px 25px rgba(0, 0, 0, 0.2); }
}

/* Main modal content styling */
#winModal .modal-content {
    /* background: linear-gradient(145deg, #6a11cb 0%, #2575fc 100%); /* Purple to Blue */
    background: linear-gradient(135deg, #ffcc33, #ff6699, #cc33ff, #6666ff); /* Multi-color vibrant */
    background-size: 400% 400%; /* For potential animation */
    color: #ffffff; /* White text for contrast */
    border: none;
    border-radius: 20px; /* More rounded */
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.2);
    text-shadow: 1px 1px 3px rgba(0, 0, 0, 0.4); /* Slightly stronger shadow */
    overflow: hidden; /* Keep pseudo-elements contained */
    animation: pulse 2s ease-in-out infinite; /* Add the subtle pulse */
    position: relative; /* Needed for pseudo-elements */
}

/* Styling for the header area */
#winModal .modal-header {
     border: none;
     padding-top: 1.5rem; /* More space above title */
     z-index: 1; /* Above pseudo-elements */
}

/* Styling for the main title */
#winModal .modal-title {
    font-size: 2.2rem; /* Larger title */
    font-weight: 700; /* Bolder */
    width: 100%;
    text-align: center;
    letter-spacing: 1px; /* Slight letter spacing */
}
#winModal .modal-title i.fa-party-horn, /* Example using Font Awesome */
#winModal .modal-title i.fa-trophy {
    margin: 0 10px;
    color: #ffdd57; /* Gold-ish color */
}

/* Styling for the body content */
#winModal .modal-body {
    font-size: 1.1rem;
    padding: 1rem 2rem; /* Adjust padding */
    z-index: 1; /* Above pseudo-elements */
}
#winModal .modal-body p {
    margin-bottom: 0.75rem; /* Spacing between lines */
}
#winModal .modal-body strong {
    color: #fff; /* Ensure strong text is also white */
    font-weight: 600;
}


/* Styling for the footer and button */
#winModal .modal-footer {
     border: none;
     padding-bottom: 1.5rem; /* More space below button */
     z-index: 1; /* Above pseudo-elements */
}

#winModal .btn-primary#play-again-button {
    background-color: rgba(255, 255, 255, 0.9); /* Semi-transparent white */
    color: #6a11cb; /* Dark purple text - match gradient */
    border: none;
    font-weight: bold;
    padding: 0.6rem 1.5rem; /* Larger button padding */
    border-radius: 50px; /* Pill shape */
    transition: all 0.3s ease;
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.2);
}
#winModal .btn-primary#play-again-button:hover {
    background-color: #ffffff; /* Solid white on hover */
    color: #2575fc; /* Blue text on hover - match gradient */
    transform: translateY(-2px) scale(1.05); /* Slight lift and scale */
    box-shadow: 0 6px 15px rgba(0, 0, 0, 0.3);
}

/* Basic Confetti using Pseudo-elements */
#winModal .modal-content::before,
#winModal .modal-content::after {
    content: '';
    position: absolute;
    top: -50px; /* Start above */
    left: 50%;
    width: 300px; /* Adjust size */
    height: 300px;
    background: radial-gradient(circle, rgba(255, 255, 255, 0.3) 10%, transparent 70%);
    border-radius: 50%;
    opacity: 0;
    animation: burst 1.5s ease-out forwards;
    z-index: 0; /* Behind content */
}

#winModal .modal-content::after {
    left: 20%;
    top: -70px;
    width: 200px;
    height: 200px;
    background: radial-gradient(circle, rgba(255, 221, 87, 0.4) 10%, transparent 70%); /* Gold-ish */
    animation-delay: 0.3s; /* Stagger the second burst */
}

@keyframes burst {
    0% { transform: translate(-50%, 0) scale(0); opacity: 0.8; }
    100% { transform: translate(-50%, 50px) scale(1.5); opacity: 0; }
}


/* Dark theme adjustments for the modal button if needed */
.dark-theme #winModal .btn-primary#play-again-button {
    /* Style might already be good, but adjust if needed */
     background-color: rgba(255, 255, 255, 0.9);
     color: #6a11cb;
}
.dark-theme #winModal .btn-primary#play-again-button:hover {
     background-color: #ffffff;
     color: #2575fc;
}

/* Simple Fireworks Animation (Optional) */
.fireworks {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    overflow: hidden;
    z-index: -1; /* Behind modal content */
}
/* Add more complex ::before/::after fireworks animation if desired */


/* Hint Indicator */
.hint-indicator {
    font-size: 0.9em;
    color: var(--warning-color);
    height: 1.5em; /* Reserve space */
    font-style: italic;
}

/* Utility */
.d-none {
    display: none !important;
}

/* Responsiveness */
@media (max-width: 991.98px) {
    .puzzle-column {
        order: 1; /* Puzzle board first */
    }
    .controls-column {
        order: 2; /* Controls second */
    }
    .pieces-column {
        order: 3; /* Pieces area handled by mobile container */
    }
    .puzzle-wrapper {
         max-width: 90vw; /* Allow more width on smaller screens */
         margin-bottom: 1rem;
    }
     .pieces-container-mobile {
        background-color: var(--card-bg);
         border: 1px solid var(--border-color);
         transition: background-color 0.3s ease, border-color 0.3s ease;
    }
     .pieces-container-mobile .pieces-area {
        max-height: 25vh; /* Limit height on mobile */
    }
}

/* Styling for form elements to match theme */
.form-control, .form-select {
    background-color: var(--bg-color);
    color: var(--text-color);
    border-color: var(--border-color);
}
.form-control:focus, .form-select:focus {
    background-color: var(--bg-color);
    color: var(--text-color);
    border-color: var(--primary-color);
    box-shadow: 0 0 0 0.25rem rgba(var(--bs-primary-rgb), 0.25); /* Bootstrap's focus */
}
.dark-theme .form-control::file-selector-button {
    background-color: var(--secondary-color);
    color: var(--bg-color);
    border-color: var(--border-color);
}

label {
    color: var(--text-color);
}

hr {
    border-top-color: var(--border-color);
}