:root {
    /* Initial State: Cold, Dark, Technical */
    --bg-color: #111115;
    --card-bg: rgba(30, 30, 35, 0.7);
    --text-main: #e0e0e0;
    --accent: #64b5f6;
    /* Cold Blue */
    --border: rgba(255, 255, 255, 0.1);
    --shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.2);
    /* Softer shadow */
    --font-family: 'Nunito', 'Segoe UI', sans-serif;
    /* Soft fun font */

    /* Variables that will animate */
    --ambient-opacity: 0;
    --ambient-color: transparent;
}

/* Romantic State Class (Added via JS) */
body.in-love {
    --accent: #ff4081;
    /* Hot Pink */
    --text-main: #fff0f5;
    --card-bg: rgba(255, 192, 203, 0.15);
    --border: rgba(255, 100, 150, 0.3);
    /* Gradient Background */
    background-color: #111115;
    /* Fallback/Base to match normal mode dark */
    background: linear-gradient(135deg, #111115 0%, #2a0a12 50%, #4a1020 100%);
    background-size: 200% 200%;
    animation: gradientShift 10s ease infinite;
}

@keyframes gradientShift {
    0% {
        background-position: 0% 50%;
    }

    50% {
        background-position: 100% 50%;
    }

    100% {
        background-position: 0% 50%;
    }
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    -webkit-tap-highlight-color: transparent;
}

body {
    background: var(--bg-color);
    color: var(--text-main);
    font-family: var(--font-family);
    height: 100vh;
    width: 100vw;
    overflow: hidden;
    /* Prevent scrolling while dragging */
    transition: background 2s ease;
    padding: 0 !important;
}

/* Header Spacer to prevent overlap */
#main-nav-placeholder {
    min-height: 80px;
    /* Increased to ensure clearance */
    width: 100%;
    background: transparent;
}

#game-container {
    position: relative;
    width: 100%;
    height: calc(100vh - 80px);
    /* Match placeholder */
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: flex-start;
    /* Start at top */
    padding-top: 20px;
    /* Slight top padding */
}

#game-controls {
    display: flex;
    width: 100%;
    margin-top: 30px;
    /* Spacing from Initialize button */
    justify-content: center;
    /* Centered buttons */
    padding: 0 40px;
    margin-bottom: 20px;
    /* Space between controls and puzzle */
    gap: 20px;
}

/* Canvas */
#puzzle-canvas {
    touch-action: none;
    /* Critical for dragging on mobile */
    box-shadow: var(--shadow);
    border-radius: 12px;
    background-color: rgba(255, 255, 255, 0.05);
    max-width: 95vw;
    max-height: 65vh;
    /* Reduced from 75vh */
    margin-top: 10px;
    /* Reduced top margin slightly */
}

/* UI Panel (Glassmorphism) */
.ui-panel {
    position: relative;
    /* Changed from absolute to relative for flow */
    /* top: 50px; Removed */
    z-index: 100;
    background: var(--card-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--border);
    padding: 1.5rem 2.5rem;
    border-radius: 35px;
    /* Extra rounded */
    box-shadow: var(--shadow);
    text-align: center;
    transition: all 0.5s ease;
    width: 90%;
    max-width: 800px;
    margin-bottom: 20px;
    /* Push canvas down */
}

h1 {
    font-size: 1.4rem;
    margin-bottom: 1.2rem;
    letter-spacing: 1px;
    text-transform: none;
    /* Less serious */
    font-weight: 700;
}

.controls-col {
    display: flex;
    flex-direction: column;
    /* Stack vertically */
    gap: 20px;
    align-items: center;
    justify-content: center;
    width: 100%;
}

.hidden {
    display: none !important;
}

/* Sliders */
input[type="range"] {
    -webkit-appearance: none;
    appearance: none;
    width: 100%;
    background: transparent;
    cursor: pointer;
    outline: none;
}

/* Track styles */
input[type="range"]::-webkit-slider-runnable-track {
    width: 100%;
    height: 28px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 20px;
    border: 1px solid var(--border);
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
    transition: background 0.3s ease;
    padding: 0 10px; /* Horizontal padding for thumb spacing */
    box-sizing: border-box;
}


input[type="range"]::-moz-range-track {
    width: 100%;
    height: 28px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 20px;
    border: 1px solid var(--border);
    padding: 0 10px;
    box-sizing: border-box;
}


/* Thumb styles */
input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    height: 18px;
    width: 18px;
    border-radius: 50%;
    background: var(--accent);
    margin-top: 4px; /* Centers thumb in track: (28 - 18 - 2*border) / 2 = 4 */
    border: 2px solid white;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.3);
    transition: transform 0.2s, background 0.2s;
}

input[type="range"]::-moz-range-thumb {
    height: 18px;
    width: 18px;
    border-radius: 50%;
    background: var(--accent);
    border: 2px solid white;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.3);
    transition: transform 0.2s, background 0.2s;
    cursor: pointer;
}

input[type="range"]:active::-webkit-slider-thumb {
    transform: scale(1.15);
}

input[type="range"]:hover::-webkit-slider-runnable-track {
    background: rgba(255, 255, 255, 0.15);
}


/* Buttons */
.glass-btn {
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid var(--border);
    color: var(--text-main);
    padding: 16px 32px;
    /* Increased Padding */
    border-radius: 50px;
    /* Fully rounded */
    cursor: pointer;
    font-size: 1rem;
    font-weight: 700;
    transition: 0.3s;
    display: flex;
    align-items: center;
    gap: 8px;
}

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

.glass-btn.small {
    padding: 12px 24px;
    /* Increased Padding */
    font-size: 0.9rem;
}

/* Ambient Overlay (for color shifts) */
#ambient-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: -1;
    /* Lovely Pink Gradient at the end */
    background: radial-gradient(circle, rgba(255, 105, 180, 0.6) 0%, rgba(255, 182, 193, 0.3) 60%, transparent 100%);
    opacity: 0;
    transition: opacity 1s ease;
}

/* Hearts */
#hearts-container {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 50;
    overflow: hidden;
}

.heart {
    position: absolute;
    width: 20px;
    /* Much smaller (was ~48px font size or default img width) */
    height: 20px;
    opacity: 0.8;
    animation: floatUp 4s linear forwards;
}

@keyframes floatUp {
    0% {
        transform: translateY(0) scale(0.5);
        opacity: 0;
    }

    20% {
        opacity: 1;
    }

    100% {
        transform: translateY(-100vh) scale(1.5);
        opacity: 0;
    }
}

/* Slide to Confirm Modal */
#modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.8);
    z-index: 1000;
    display: flex;
    justify-content: center;
    align-items: center;
}

.modal {
    background: var(--card-bg);
    backdrop-filter: blur(15px);
    padding: 2rem;
    border-radius: 40px;
    border: 1px solid var(--border);
    width: 320px;
    text-align: center;
}

.slider-confirm-track {
    width: 100%;
    height: 52px;
    background: rgba(0, 0, 0, 0.4);
    border-radius: 30px;
    position: relative;
    margin: 20px 0;
    overflow: hidden;
    border: 1px solid var(--border);
    display: flex;
    align-items: center;
}

#slider-handle {
    width: 42px;
    height: 42px;
    background: var(--accent);
    border-radius: 50%;
    position: absolute;
    left: 10px; /* Padding for start */
    top: 50%;
    transform: translateY(-50%);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    cursor: pointer;
    font-size: 10px;
    user-select: none;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.3);
    border: 2px solid white;
    z-index: 2;
}



.slider-text {
    line-height: 50px;
    color: rgba(255, 255, 255, 0.5);
    font-size: 0.9rem;
    pointer-events: none;
}

.text-btn {
    background: none;
    border: none;
    color: #aaa;
    text-decoration: underline;
    cursor: pointer;
}

/* Specific fix for Puzzle Game Header to match page aesthetics */
#main-nav-placeholder .xw-main-nav-header {
    background: transparent !important;
    backdrop-filter: none !important;
    -webkit-backdrop-filter: none !important;
    border: none !important;
    box-shadow: none !important;
    padding-top: 10px;
}

#main-nav-placeholder .xw-main-nav-header .logo {
    text-shadow: 0 0 10px rgba(0, 0, 0, 0.5);
}

#main-nav-placeholder .nav-links a {
    text-shadow: 0 0 5px rgba(0, 0, 0, 0.5);
}

/* Music Attribution */
.music-attribution {
    position: fixed;
    bottom: 10px;
    right: 15px;
    font-size: 0.75rem;
    color: rgba(255, 255, 255, 0.4);
    text-align: right;
    z-index: 40;
    pointer-events: none;
    line-height: 1.4;
    font-family: var(--font-family);
}

.music-attribution a {
    color: rgba(255, 255, 255, 0.6);
    text-decoration: none;
    pointer-events: auto;
    transition: color 0.2s;
}

.music-attribution a:hover {
    color: var(--accent);
    text-decoration: underline;
}

/* --- Toggle Switch Styles --- */
.toggle-switch {
    display: inline-flex;
    align-items: center;
    position: relative;
    cursor: pointer;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 50px;
    padding: 5px 15px 5px 5px;
    border: 1px solid var(--border);
    transition: 0.3s;
    height: 40px;
}

.toggle-switch:hover {
    background: rgba(255, 255, 255, 0.2);
}

.toggle-switch input {
    opacity: 0;
    width: 0;
    height: 0;
}

.toggle-label {
    margin-left: 10px;
    font-size: 0.9rem;
    color: var(--text-main);
    font-weight: 700;
}

/* The Slider */
.slider {
    position: relative;
    display: inline-block;
    width: 50px;
    /* Wider for more space */
    height: 28px;
    /* Taller */
    background-color: #ccc;
    transition: .4s;
    border-radius: 34px;
    box-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.4);
    /* Inner shadow for depth */
}

.slider:before {
    position: absolute;
    content: "";
    height: 22px;
    width: 22px;
    left: 4px;
    bottom: 3px;
    background-color: white;
    transition: .4s;
    border-radius: 50%;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
    /* Drop shadow on knob */
    z-index: 2;
}

/* Icons inside slider? Pseudo elements */
.slider:after {
    content: "❄️";
    /* Cold/Blue/Normal icon */
    position: absolute;
    right: 6px;
    top: 50%;
    transform: translateY(-50%);
    font-size: 14px;
    opacity: 0.8;
    transition: 0.4s;
}

input:checked+.slider {
    background-color: #ff4081;
    /* Pink for Romance */
}

input:checked+.slider:after {
    content: "❤️";
    /* Heart icon */
    left: 8px;
    /* Move icon to left */
    right: auto;
    color: white;
    opacity: 1;
}

input:not(:checked)+.slider {
    background-color: #64b5f6;
    /* Blue for Normal */
}

input:focus+.slider {
    box-shadow: 0 0 1px #2196F3;
}

input:checked+.slider:before {
    transform: translateX(20px);
    /* Adjusted for wider slider */
}

/* --- Specific Toggle Icons --- */

/* Music Toggle */
#mute-music-toggle+.slider:after {
    content: "🎵";
    font-size: 12px;
}

#mute-music-toggle:checked+.slider:after {
    content: "🔇";
    left: 8px;
    right: auto;
}

#mute-music-toggle:checked+.slider {
    background-color: #ff5252;
    /* Red for muted */
}

/* SFX Toggle */
#mute-sfx-toggle+.slider:after {
    content: "🔊";
    font-size: 12px;
}

#mute-sfx-toggle:checked+.slider:after {
    content: "🔇";
    left: 8px;
    right: auto;
}

#mute-sfx-toggle:checked+.slider {
    background-color: #ff5252;
    /* Red for muted */
}

.toggle-label {
    transition: color 0.3s;
}

input:checked~.toggle-label {
    color: white;
    /* Changed from pink to white */
    text-shadow: 0 0 5px rgba(255, 255, 255, 0.5);
}

input:not(:checked)~.toggle-label {
    color: #64b5f6;
}

/* Hide Image Toggle specific */
#hide-image-toggle+.slider:after {
    content: "👁️";
    /* Eye icon for visible */
    font-size: 12px;
}

#hide-image-toggle:checked+.slider:after {
    content: "🚫";
    /* Prohibition or hidden icon */
    left: 8px;
    right: auto;
}

#hide-image-toggle:checked+.slider {
    background-color: #555;
    /* Grey/Black for hidden state */
}

/* --- Normal Mode Blue Overlay --- */
#ambient-overlay.blue-mode {
    background: radial-gradient(circle, rgba(100, 181, 246, 0.4) 0%, rgba(33, 150, 243, 0.2) 60%, transparent 100%);
}

/* Timer Display */
.timer-display {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--accent);
    background: rgba(0, 0, 0, 0.2);
    padding: 5px 15px;
    border-radius: 12px;
    border: 1px solid var(--border);
    min-width: 80px;
    text-align: center;
    display: flex;
    align-items: center;
    justify-content: center;
}

/* Toast Notification */
.toast {
    position: fixed;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%);
    background: rgba(255, 64, 129, 0.9);
    /* Pinkish alert */
    color: white;
    padding: 12px 24px;
    border-radius: 50px;
    font-weight: 600;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.3);
    z-index: 9999;
    opacity: 0;
    transition: opacity 0.3s, transform 0.3s;
    pointer-events: none;
}

.toast.show {
    opacity: 1;
    transform: translateX(-50%) translateY(-10px);
    /* Float up */
}

/* --- Extracted Inline Styles --- */
.toggle-container {
    display: flex;
    flex-direction: column;
    gap: 15px;
    margin-bottom: 20px;
}

.toggle-row {
    display: flex;
    gap: 20px;
    flex-wrap: wrap;
    justify-content: center;
}

.upload-row {
    display: flex;
    gap: 10px;
    margin-bottom: 15px;
    justify-content: center;
}

#upload-error {
    color: #ff4081;
    font-size: 0.8rem;
    margin-bottom: 10px;
    text-align: center;
}

.preview-container {
    margin-top: 10px;
    display: flex;
    justify-content: center;
    align-items: center;
    width: 100%;
    margin-bottom: 20px;
    transition: opacity 0.5s ease;
}

#preview-canvas {
    max-width: 95vw;
    max-height: 65vh;
    width: auto;
    height: auto;
    border-radius: 12px;
    box-shadow: var(--shadow);
    background-color: rgba(255, 255, 255, 0.05);
    display: block;
    object-fit: contain; /* Guarantee aspect ratio within bounds */
}


/* --- Responsive Desktop UI Panel --- */
@media (min-width: 1024px) {
    .ui-panel {
        display: flex;
        flex-direction: row;
        flex-wrap: wrap;
        align-items: center;
        justify-content: center;
        gap: 15px;
        padding: 10px 20px;
        max-width: 95%;
        border-radius: 20px;
        margin-bottom: 10px;
    }

    #title-text {
        margin-bottom: 0;
        margin-right: 15px;
        white-space: nowrap;
    }

    .toggle-container {
        flex-direction: row;
        margin-bottom: 0;
        gap: 15px;
    }

    .toggle-row {
        flex-wrap: nowrap;
        gap: 15px;
    }

    .controls-col {
        flex-direction: row;
        width: auto;
        gap: 15px;
    }

    .slider-group {
        display: flex;
        align-items: center;
        gap: 15px;
        position: relative;
    }

    .upload-row {
        margin-bottom: 0;
    }

    .preview-container {
        margin-top: 10px;
        width: 100%;
        flex: 1;
    }

    #preview-canvas {
        max-height: 65vh;
        max-width: 90vw;
    }


    #upload-error {
        position: absolute;
        bottom: -20px;
        left: 0;
        width: 100%;
        margin: 0;
        font-size: 0.7rem;
    }

    #game-controls {
        margin-top: 0;
        margin-bottom: 0;
        padding: 0;
        width: auto;
    }
}

/* --- Slim Mobile Scaling --- */
@media (max-width: 480px) {
    .ui-panel {
        padding: 1rem 1rem;
        gap: 10px;
        width: 100%;
        border-radius: 20px;
    }

    h1#title-text {
        font-size: 1.2rem;
        margin-bottom: 0.8rem;
    }

    .glass-btn {
        padding: 10px 20px;
        font-size: 0.85rem;
    }

    .glass-btn.small {
        padding: 8px 16px;
        font-size: 0.8rem;
    }

    .toggle-switch {
        height: 32px;
        padding: 3px 10px 3px 3px;
    }

    .slider {
        width: 40px;
        height: 24px;
    }

    .slider:before {
        height: 18px;
        width: 18px;
        bottom: 3px;
        left: 3px;
    }

    input:checked+.slider:before {
        transform: translateX(16px);
    }

    .slider:after,
    #mute-music-toggle+.slider:after,
    #mute-sfx-toggle+.slider:after,
    #hide-image-toggle+.slider:after {
        font-size: 10px;
    }

    .toggle-label {
        font-size: 0.8rem;
        margin-left: 8px;
    }

    #game-controls {
        gap: 10px;
        padding: 0 10px;
    }

    .timer-display {
        font-size: 1.2rem;
        padding: 4px 10px;
        min-width: 60px;
    }

    .toggle-row,
    .upload-row {
        gap: 10px;
    }
}