/* Custom Reset and Variables */
:root {
    --bg-gradient: radial-gradient(circle at top left, #18181b, #09090b);
    --card-bg: rgba(39, 39, 42, 0.45);
    --card-border: rgba(63, 63, 70, 0.5);
    --text-primary: #f4f4f5;
    --text-secondary: #a1a1aa;
    --accent-glow: rgba(99, 102, 241, 0.15);
    --badge-bg: rgba(63, 63, 70, 0.3);
    --badge-border: rgba(82, 82, 91, 0.5);
    --accent-color: #6366f1; /* Indigo */
    --accent-color-hover: #818cf8;
}

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

body {
    background: var(--bg-gradient);
    color: var(--text-primary);
    font-family: 'Outfit', sans-serif;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow-x: hidden;
    overflow-y: auto;
}

.container {
    display: flex;
    justify-content: center;
    align-items: center;
    width: 100%;
    min-height: 100vh;
    padding: 1.5rem;
}

/* Glassmorphism Card */
.glass-card {
    background: var(--card-bg);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border: 1px solid var(--card-border);
    border-radius: 1.5rem;
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5), 
                0 0 40px var(--accent-glow);
    padding: 2rem;
    text-align: center;
    transition: width 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
    max-width: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
}

/* Title Styling */
.title {
    font-family: 'Space Grotesk', sans-serif;
    font-size: 2.25rem;
    font-weight: 700;
    margin-bottom: 1.5rem;
    background: linear-gradient(135deg, #ffffff 30%, #a1a1aa 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    letter-spacing: -0.05em;
}

/* Canvas Container */
.canvas-wrapper {
    display: flex;
    justify-content: center;
    width: 100%;
    margin-bottom: 1.5rem;
    position: relative;
}

.canvas {
    border-radius: 1rem;
    border: 1px solid rgba(82, 82, 91, 0.6);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
    max-width: 100%;
    height: auto;
    display: block;
    background-color: #000;
    transition: border-color 0.3s ease;
}

.canvas:hover {
    border-color: var(--accent-color);
}

/* Score and Status Info Row */
.stats-row {
    display: flex;
    justify-content: center;
    align-items: center;
    flex-wrap: wrap;
    width: 100%;
    margin-top: 1rem;
    gap: 0.75rem;
}

.score-badge {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-primary);
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.2) 0%, rgba(99, 102, 241, 0.05) 100%);
    border: 1px solid rgba(99, 102, 241, 0.3);
    padding: 0.5rem 1.25rem;
    border-radius: 9999px;
    letter-spacing: -0.02em;
    font-family: 'Space Grotesk', sans-serif;
    box-shadow: 0 4px 12px rgba(99, 102, 241, 0.1);
    transition: all 0.3s ease;
}

/* Controls / Guides */
.controls-guide {
    margin-top: 1.5rem;
    font-size: 0.85rem;
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    flex-wrap: wrap;
}

.key-badge {
    font-family: 'Space Grotesk', sans-serif;
    font-weight: 700;
    font-size: 0.75rem;
    color: var(--text-primary);
    background: rgba(255, 255, 255, 0.08);
    border: 1px solid rgba(255, 255, 255, 0.15);
    border-bottom: 2px solid rgba(255, 255, 255, 0.3);
    padding: 0.2rem 0.5rem;
    border-radius: 0.375rem;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.25);
    letter-spacing: 0.05em;
}

.separator {
    color: rgba(63, 63, 70, 0.8);
    margin: 0 0.25rem;
}

/* Helper Class */
.hidden {
    display: none !important;
}

/* Subtitle */
.subtitle {
    font-size: 1rem;
    color: var(--text-secondary);
    margin-bottom: 2rem;
    max-width: 450px;
    line-height: 1.5;
}

/* Drop Zone */
.drop-zone {
    width: 100%;
    min-width: 320px;
    max-width: 450px;
    border: 2px dashed var(--badge-border);
    border-radius: 1rem;
    padding: 2.5rem 1.5rem;
    cursor: pointer;
    background: rgba(255, 255, 255, 0.02);
    transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 0.75rem;
    margin-bottom: 1.5rem;
}

.drop-zone.dragover {
    border-color: var(--accent-color);
    background: rgba(99, 102, 241, 0.08);
    box-shadow: 0 0 20px rgba(99, 102, 241, 0.15);
}

.upload-icon {
    width: 40px;
    height: 40px;
    color: var(--text-secondary);
    transition: color 0.3s ease, transform 0.3s ease;
}

.drop-zone:hover .upload-icon,
.drop-zone.dragover .upload-icon {
    color: var(--accent-color-hover);
    transform: translateY(-2px);
}

.drop-text {
    font-size: 0.95rem;
    color: var(--text-secondary);
}

.browse-link {
    color: var(--accent-color-hover);
    font-weight: 600;
    text-decoration: underline;
    text-underline-offset: 2px;
}

.hidden-input {
    display: none;
}

/* Previews */
.preview-container {
    width: 100%;
    max-width: 450px;
    margin-bottom: 2rem;
    text-align: left;
}

.preview-title {
    font-family: 'Space Grotesk', sans-serif;
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: 0.25rem;
}

.preview-hint {
    font-size: 0.75rem;
    color: var(--text-secondary);
    margin-bottom: 0.75rem;
    opacity: 0.8;
}

.preview-list {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(100px, 1fr));
    gap: 0.75rem;
    max-height: 150px;
    overflow-y: auto;
    padding-right: 0.25rem;
}

/* Custom Scrollbar for Previews */
.preview-list::-webkit-scrollbar {
    width: 4px;
}
.preview-list::-webkit-scrollbar-track {
    background: rgba(255, 255, 255, 0.02);
}
.preview-list::-webkit-scrollbar-thumb {
    background: var(--badge-border);
    border-radius: 99px;
}

.preview-chip {
    position: relative;
    background: rgba(255, 255, 255, 0.04);
    border: 1px solid var(--badge-border);
    border-radius: 0.75rem;
    padding: 0.5rem;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.35rem;
    cursor: grab;
}

.preview-chip.dragging {
    opacity: 0.5;
}

.preview-chip.drag-over {
    border-color: var(--accent-color);
    box-shadow: 0 0 12px rgba(99, 102, 241, 0.25);
}

.preview-thumbnail {
    width: 100%;
    aspect-ratio: 1;
    object-fit: cover;
    border-radius: 0.5rem;
}

.preview-name {
    font-size: 0.7rem;
    color: var(--text-secondary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    width: 100%;
    text-align: center;
}

.delete-btn {
    position: absolute;
    top: -4px;
    right: -4px;
    width: 18px;
    height: 18px;
    border-radius: 50%;
    background: #ef4444;
    color: #fff;
    border: none;
    font-size: 10px;
    font-weight: bold;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    box-shadow: 0 2px 4px rgba(0,0,0,0.3);
    transition: transform 0.2s ease;
}

.delete-btn:hover {
    transform: scale(1.15);
    background: #f87171;
}

/* Buttons Area */
.action-buttons {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    width: 100%;
    max-width: 450px;
}

.btn {
    font-family: 'Space Grotesk', sans-serif;
    font-weight: 700;
    font-size: 1rem;
    padding: 0.85rem 1.5rem;
    border-radius: 0.75rem;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
    width: 100%;
    border: none;
}

.btn-primary {
    background: linear-gradient(135deg, var(--accent-color) 0%, #4f46e5 100%);
    color: var(--text-primary);
    box-shadow: 0 4px 15px rgba(99, 102, 241, 0.3);
}

.btn-primary:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(99, 102, 241, 0.4);
    background: linear-gradient(135deg, var(--accent-color-hover) 0%, var(--accent-color) 100%);
}

.btn-primary:disabled {
    opacity: 0.35;
    cursor: not-allowed;
    box-shadow: none;
}

.btn-secondary {
    background: transparent;
    border: 1px solid var(--badge-border);
    color: var(--text-secondary);
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.05);
    color: var(--text-primary);
    border-color: var(--text-secondary);
}

/* Fade Transitions */
.fade-out {
    opacity: 0;
    transform: scale(0.95);
    transition: opacity 0.4s ease, transform 0.4s ease;
}

.fade-in {
    opacity: 0;
    transform: scale(0.95);
    animation: fadeInAnimation 0.5s forwards cubic-bezier(0.25, 0.8, 0.25, 1);
}

@keyframes fadeInAnimation {
    to {
        opacity: 1;
        transform: scale(1);
    }
}

/* Canvas max-width constraint for large images */
.canvas-wrapper {
    max-width: 100%;
    overflow: hidden;
}

.canvas {
    max-width: 100%;
    height: auto;
}

/* Session Total Badge */
.session-total-badge {
    font-size: 1rem;
    font-weight: 600;
    color: #34d399;
    background: rgba(52, 211, 153, 0.1);
    border: 1px solid rgba(52, 211, 153, 0.3);
    padding: 0.5rem 1.25rem;
    border-radius: 9999px;
    font-family: 'Space Grotesk', sans-serif;
    letter-spacing: -0.01em;
    box-shadow: 0 2px 8px rgba(52, 211, 153, 0.1);
    transition: all 0.3s ease;
}

/* Personal Best Badge */
.personal-best-badge {
    font-size: 0.9rem;
    font-weight: 600;
    color: #fbbf24;
    background: rgba(251, 191, 36, 0.1);
    border: 1px solid rgba(251, 191, 36, 0.3);
    padding: 0.5rem 1rem;
    border-radius: 9999px;
    font-family: 'Space Grotesk', sans-serif;
    letter-spacing: -0.01em;
    box-shadow: 0 2px 8px rgba(251, 191, 36, 0.1);
    transition: all 0.3s ease;
}

/* Touch Controls */
.touch-controls {
    display: flex;
    gap: 0.75rem;
    width: 100%;
    margin-top: 1.25rem;
}

.touch-btn {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    font-family: 'Space Grotesk', sans-serif;
    font-weight: 600;
    font-size: 0.9rem;
    color: var(--text-primary);
    background: rgba(255, 255, 255, 0.06);
    border: 1px solid var(--badge-border);
    border-radius: 0.75rem;
    padding: 0.75rem 1rem;
    cursor: pointer;
    transition: all 0.2s ease;
    user-select: none;
    -webkit-tap-highlight-color: transparent;
}

.touch-btn svg {
    width: 18px;
    height: 18px;
    flex-shrink: 0;
    opacity: 0.85;
}

.touch-btn:hover {
    background: rgba(99, 102, 241, 0.12);
    border-color: rgba(99, 102, 241, 0.4);
    color: var(--accent-color-hover);
}

.touch-btn:active {
    transform: scale(0.97);
    background: rgba(99, 102, 241, 0.2);
}

/* Back / New Game Button */
.btn-back {
    margin-top: 1rem;
    background: transparent;
    border: 1px solid rgba(255, 255, 255, 0.08);
    color: var(--text-secondary);
    font-size: 0.85rem;
    padding: 0.55rem 1.25rem;
    width: auto;
    align-self: center;
}

.btn-back:hover {
    color: var(--text-primary);
    border-color: var(--badge-border);
    background: rgba(255, 255, 255, 0.04);
}

/* Winning Screen */
.win-subtitle {
    font-size: 1rem;
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
    line-height: 1.5;
}

.final-score-badge {
    font-family: 'Space Grotesk', sans-serif;
    font-size: 3.5rem;
    font-weight: 800;
    color: var(--text-primary);
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.25) 0%, rgba(99, 102, 241, 0.08) 100%);
    border: 1px solid rgba(99, 102, 241, 0.4);
    padding: 1rem 2.5rem;
    border-radius: 1rem;
    letter-spacing: -0.03em;
    box-shadow: 0 8px 24px rgba(99, 102, 241, 0.2);
    margin-bottom: 1rem;
}

.win-pb-text {
    font-size: 1rem;
    font-weight: 600;
    color: #fbbf24;
    margin-bottom: 1.5rem;
}

#win-screen .btn-primary {
    max-width: 300px;
}

/* Progress Badge */
.progress-badge {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text-secondary);
    background: var(--badge-bg);
    border: 1px solid var(--badge-border);
    padding: 0.5rem 1rem;
    border-radius: 9999px;
    font-family: 'Space Grotesk', sans-serif;
}

/* Error Banners */
.error-banner {
    width: 100%;
    max-width: 450px;
    padding: 0.75rem 1rem;
    margin-bottom: 1rem;
    border-radius: 0.75rem;
    background: rgba(239, 68, 68, 0.12);
    border: 1px solid rgba(239, 68, 68, 0.35);
    color: #fca5a5;
    font-size: 0.9rem;
    text-align: center;
}

/* Image Loading Spinner */
.image-loading {
    position: absolute;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(0, 0, 0, 0.45);
    border-radius: 1rem;
}

.spinner {
    width: 36px;
    height: 36px;
    border: 3px solid rgba(255, 255, 255, 0.15);
    border-top-color: var(--accent-color);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* Focus styles */
.btn:focus-visible,
.touch-btn:focus-visible,
.delete-btn:focus-visible,
.drop-zone:focus-visible {
    outline: 2px solid var(--accent-color-hover);
    outline-offset: 2px;
}