/* --- Foundational Styles --- */
:root { --bg-primary: #0a0a0b; --bg-secondary: #111115; --glass-bg: rgba(26, 26, 32, 0.7); --glass-bg-nav: rgba(26, 26, 32, 0.85); --glass-border: rgba(255, 255, 255, 0.12); --text-primary: #ffffff; --text-secondary: #a1a1aa; --text-muted: #71717a; --accent-purple: #8b5cf6; --accent-cyan: #06b6d4; --accent-orange: #f59e0b; --gradient-primary: linear-gradient(135deg, #8b5cf6 0%, #06b6d4 100%); --radius-xl: 20px; --radius-lg: 16px; --radius-md: 12px; }
* { margin: 0; padding: 0; box-sizing: border-box; }
body { font-family: 'Inter', sans-serif; background: var(--bg-primary); color: var(--text-primary); padding: 1rem; position: relative; overflow-x: hidden; }
body.popup-open { overflow: hidden; }
/* --- Background Decorations --- */
.background-overlay, .floating-shapes { position: fixed; top: 0; left: 0; width: 100%; height: 100%; z-index: -1; pointer-events: none; }
.background-overlay { background: radial-gradient(circle at 25% 25%, rgba(139, 92, 246, 0.1) 0%, transparent 50%), radial-gradient(circle at 75% 75%, rgba(6, 182, 212, 0.1) 0%, transparent 50%); }
.shape { position: absolute; border-radius: 50%; filter: blur(80px); opacity: 0.3; }
.shape-1 { width: 300px; height: 300px; background: var(--accent-purple); top: 10%; left: 10%; }
.shape-2 { width: 400px; height: 400px; background: var(--accent-cyan); top: 50%; right: 5%; }
/* --- Main Layout & Card Styles --- */
.app-container { width: 100%; max-width: 900px; margin: 1.5rem auto 0; display: flex; flex-direction: column; gap: 1.5rem; }
.glass-card { background: var(--glass-bg); backdrop-filter: blur(20px); -webkit-backdrop-filter: blur(20px); border: 1px solid var(--glass-border); border-radius: var(--radius-xl); padding: 2rem; }

/* --- FIX: Styles for the new Tool Navigation Bar --- */
.tool-navigation-bar {
    padding: 1rem 2rem;
    max-width: 1200px;
    margin: 1.5rem auto 0;
    position: relative; /* Required for z-index */
    z-index: 5; /* Lifts it above page content but below main nav menu */
}
.tool-nav .nav-links {
    list-style: none;
    display: flex;
    flex-wrap: wrap;
    gap: 2rem;
    justify-content: center; /* Center the links */
}
.tool-nav .nav-links a {
    font-weight: 600;
    color: var(--text-secondary);
    position: relative;
    padding: 0.5rem 0;
    cursor: pointer;
    text-decoration: none;
}
.tool-nav .nav-links a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 2px;
    background: var(--gradient-primary);
    transform: scaleX(0);
    transform-origin: right;
    transition: transform 0.3s ease-in-out;
}
.tool-nav .nav-links a:hover::after, .tool-nav .nav-links a.active::after {
    transform: scaleX(1);
    transform-origin: left;
}
.tool-nav .nav-links a.active { color: var(--text-primary); }
/* --- END FIX --- */

/* --- Helper Classes --- */
.hidden { display: none !important; }
.view { display: none; opacity: 0; transition: opacity 0.4s ease-out; }
.view.active { display: block; opacity: 1; }
/* --- Setup & Upload Area --- */
.setup-options { display: flex; align-items: center; justify-content: space-between; gap: 2rem; margin-bottom: 2rem; padding-bottom: 1.5rem; border-bottom: 1px solid var(--glass-border); flex-wrap: wrap; }
.setup-manual, .setup-directory { display: flex; align-items: center; gap: 0.8rem; flex-wrap: wrap; }
.setup-divider { color: var(--text-muted); font-weight: 700; font-size: 0.9rem; padding: 0 1rem; }
.setup-manual label { font-weight: 600; color: var(--text-secondary); }
.setup-manual input[type="number"] { background: var(--bg-secondary); border: 1px solid var(--glass-border); color: var(--text-primary); border-radius: var(--radius-md); padding: 0.5rem; width: 60px; text-align: center; }
.setup-manual button, .directory-btn, .secondary-btn { background: var(--gradient-primary); color: var(--text-primary); border: none; border-radius: var(--radius-md); padding: 0.6rem 1.2rem; font-weight: 600; cursor: pointer; transition: all 0.2s; text-align: center; }
.secondary-btn { background: var(--bg-secondary); border: 1px solid var(--glass-border); padding: 0.6rem 1rem; }
.setup-manual button:hover, .directory-btn:hover, .secondary-btn:hover { transform: scale(1.05); }
.secondary-btn:hover { border-color: var(--accent-purple); color: var(--accent-purple); }
.upload-area { display: grid; grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); gap: 1rem; }
.upload-box { position: relative; }
.upload-box label { display: flex; align-items: center; justify-content: center; background: var(--bg-secondary); border: 2px dashed var(--glass-border); border-radius: var(--radius-lg); padding: 1rem; text-align: center; font-weight: 600; color: var(--text-secondary); cursor: pointer; transition: all 0.3s ease; font-size: 0.9rem; min-height: 80px; }
.upload-box label:hover { background: var(--accent-purple); border-color: var(--accent-purple); color: var(--text-primary); }
.upload-box input[type="file"] { display: none; }
.upload-box label.uploaded { background: rgba(6, 182, 212, 0.05); border-style: solid; border-color: var(--accent-cyan); color: var(--text-primary); cursor: default; }
.upload-box label.uploaded:hover { background: rgba(6, 182, 212, 0.1); border-color: var(--accent-cyan); }
.upload-box.drag-over label { background: var(--accent-purple); border-color: var(--text-primary); color: var(--text-primary); transform: scale(1.02); box-shadow: 0 0 20px rgba(139, 92, 246, 0.4); }
.drop-hint { text-align: center; color: var(--text-muted); font-size: 0.85rem; margin-top: 1rem; opacity: 0.6; pointer-events: none; }
.remove-img-btn { position: absolute; top: -8px; right: -8px; width: 24px; height: 24px; border-radius: 50%; background: #ef4444; color: white; border: 2px solid var(--bg-primary); font-size: 14px; font-weight: bold; cursor: pointer; display: flex; align-items: center; justify-content: center; z-index: 10; opacity: 0; transition: opacity 0.2s; }
.upload-box:hover .remove-img-btn { opacity: 1; }
.remove-img-btn:hover { transform: scale(1.1); background: #dc2626; }
/* --- Comparison Tools General --- */
.comparison-tool .img-container, .magnify-container, .magnify-preview { position: relative; overflow: hidden; border-radius: var(--radius-lg); background-color: var(--bg-secondary); border: 1px solid var(--glass-border); box-shadow: 0 10px 30px rgba(0,0,0,0.2); }
.comparison-tool img, #heatmap-canvas, #export-preview-canvas { display: block; width: 100%; height: auto; max-height: 70vh; object-fit: contain; user-select: none; pointer-events: none; }
.controls { margin-top: 1.5rem; text-align: center; }
.status-message { color: var(--text-secondary); margin-top: 1rem; text-align: center; }
/* --- Multi-Slider Logic & Reset Button --- */
.img-wrapper-dynamic { position: absolute; top: 0; left: 0; width: 100%; height: 100%; overflow: hidden; }
.img-wrapper-dynamic.base-image { position: static; } 
.slider-handle-dynamic { position: absolute; top: 0; transform: translateX(-50%); width: 4px; height: 100%; background: rgba(255, 255, 255, 0.8); cursor: ew-resize; z-index: 20; }
.slider-handle-dynamic::before { content: ''; position: absolute; top: 50%; left: 50%; transform: translate(-50%, -50%); width: 40px; height: 40px; border: 2px solid white; border-radius: 50%; background: var(--gradient-primary); }
.reset-sliders-btn { position: absolute; top: 1rem; right: 1rem; z-index: 25; background: var(--glass-bg); border: 1px solid var(--glass-border); color: var(--text-secondary); font-size: 0.8rem; font-weight: 600; padding: 0.4rem 0.8rem; border-radius: var(--radius-md); cursor: pointer; transition: all 0.2s ease; }
.reset-sliders-btn:hover { background: var(--accent-cyan); color: var(--text-primary); border-color: var(--accent-cyan); }
/* --- Tool 2: Magnify View --- */
.magnify-view-tool { display: grid; grid-template-columns: 1fr 1fr; gap: 1.5rem; align-items: flex-start; }
.magnify-container { cursor: crosshair; }
.magnify-loupe { position: absolute; border: 2px solid var(--accent-cyan); border-radius: var(--radius-md); pointer-events: none; display: none; }
.magnify-preview { position: relative; width: 100%; padding-top: 100%; overflow: hidden; border-radius: var(--radius-lg); background-color: var(--bg-secondary); transition: padding-top 0.3s ease; }
.magnify-controls { display: flex; flex-direction: column; align-items: center; gap: 1.5rem; margin-top: 1rem; }
.aspect-ratio-control, .zoom-control { display: flex; flex-direction: column; align-items: center; gap: 0.5rem; width: 100%; }
.aspect-ratio-control label, .zoom-control label { margin-bottom: 0; color: var(--text-secondary); }
.aspect-ratio-control select { width: 180px; }
.magnify-view-tool.landscape-mode { grid-template-columns: 1fr; }
.magnify-view-tool.landscape-mode .magnify-controls { flex-direction: row; justify-content: center; }
/* --- Tool 3: Fade Overlay View --- */
.fade-container { position: relative; }
.fade-container img { position: absolute; top: 0; left: 0; width: 100%; height: 100%; object-fit: contain; }
#fade-sizer { position: relative; visibility: hidden; }
#fade-layer-2 { transition: opacity 0.1s ease-in-out; }
.fade-controls { display: flex; flex-direction: column; align-items: center; gap: 1.2rem; }
.fade-selectors { display: flex; align-items: center; gap: 1rem; color: var(--text-secondary); }
.fade-selectors select, .heatmap-selectors select, .blend-mode-control select, .aspect-ratio-control select, .export-controls select { background: var(--bg-secondary); border: 1px solid var(--glass-border); color: var(--text-primary); border-radius: var(--radius-md); padding: 0.5rem; text-align: center; }
.blend-mode-control { display: flex; align-items: center; gap: 1rem; }
.blend-mode-control label { margin-bottom: 0; }
.blend-mode-control select { width: 150px; }
/* --- Tool 4: Heatmap View --- */
.heatmap-controls { display: flex; flex-direction: column; align-items: center; gap: 1rem; margin-bottom: 1rem; }
.heatmap-selectors { display: flex; align-items: center; gap: 1rem; flex-wrap: wrap; justify-content: center; }
.heatmap-controls button { background: var(--gradient-primary); color: var(--text-primary); border: none; border-radius: var(--radius-md); padding: 0.6rem 1.2rem; font-weight: 600; cursor: pointer; transition: transform 0.2s; }
.heatmap-controls button:hover { transform: scale(1.05); }
/* --- Tool 5: Export View --- */
.export-controls { display: flex; justify-content: center; align-items: center; flex-wrap: wrap; gap: 1.5rem; margin-bottom: 1.5rem; }
.control-group { display: flex; flex-direction: column; align-items: center; gap: 0.5rem; }
.control-group label { margin-bottom: 0; font-weight: 600; color: var(--text-secondary); }
.control-group-sub { display: flex; align-items: center; gap: 1.5rem; padding: 1rem; border: 1px solid var(--glass-border); border-radius: var(--radius-lg); background: rgba(0,0,0,0.1); }
.control-group-divider { width: 1px; height: 40px; background: var(--glass-border); align-self: center; }
.checkbox-label { display: flex; align-items: center; gap: 0.5rem; cursor: pointer; }
.radio-group { display: flex; gap: 1rem; }
.radio-group label { display: flex; align-items: center; gap: 0.3rem; cursor: pointer; }
input[type="color"] { -webkit-appearance: none; -moz-appearance: none; appearance: none; width: 40px; height: 25px; background-color: transparent; border: 1px solid var(--glass-border); border-radius: var(--radius-md); cursor: pointer; }
input[type="color"]::-webkit-color-swatch { border-radius: var(--radius-md); border: none; }
input[type="color"]::-moz-color-swatch { border-radius: var(--radius-md); border: none; }
.export-controls button { background: var(--gradient-primary); color: var(--text-primary); border: none; border-radius: var(--radius-md); padding: 0.6rem 1.2rem; font-weight: 600; cursor: pointer; transition: transform 0.2s; align-self: center; }
.export-controls button:hover { transform: scale(1.05); }
/* --- Custom Range Sliders --- */
input[type="range"] { -webkit-appearance: none; appearance: none; width: 80%; max-width: 400px; height: 4px; background: var(--glass-border); border-radius: 5px; outline: none; cursor: pointer; }
input[type="range"]::-webkit-slider-thumb { -webkit-appearance: none; appearance: none; width: 20px; height: 20px; border-radius: 50%; background: var(--gradient-primary); border: 2px solid white; }
/* --- Popups --- */
.popup-overlay { position: fixed; inset: 0; background: rgba(10, 10, 11, 0.5); backdrop-filter: blur(10px); -webkit-backdrop-filter: blur(10px); z-index: 2000; display: flex; align-items: center; justify-content: center; padding: 1rem; }
.popup-card { position: relative; max-width: 500px; width: 100%; }
.popup-close-btn { position: absolute; top: 1rem; right: 1.5rem; background: transparent; border: none; color: var(--text-secondary); font-size: 1.5rem; line-height: 1; cursor: pointer; transition: color 0.2s; }
.popup-close-btn:hover { color: var(--text-primary); }
.popup-card h3 { color: var(--accent-orange); margin-bottom: 0.5rem; }
.popup-card p { color: var(--text-secondary); margin-bottom: 1rem; }
.popup-card ul { list-style: none; padding-left: 0; }
.popup-card li { margin-bottom: 0.75rem; }
.popup-card li strong { color: var(--accent-cyan); }
#comparison-container { position: relative; min-height: 400px; }
.fullscreen-btn { position: absolute; top: 1.2rem; left: 1.2rem; z-index: 100; background: var(--glass-bg); border: 1px solid var(--glass-border); color: var(--text-secondary); padding: 0.6rem; border-radius: var(--radius-md); cursor: pointer; transition: all 0.2s; display: flex; align-items: center; justify-content: center; backdrop-filter: blur(10px); }
.fullscreen-btn:hover { background: var(--bg-secondary); color: var(--accent-cyan); border-color: var(--accent-cyan); transform: scale(1.1); }
#comparison-container:fullscreen { padding: 3rem 2rem 2rem; background: var(--bg-primary); width: 100vw; height: 100vh; border-radius: 0; border: none; overflow-y: auto; }
#comparison-container:fullscreen .fullscreen-btn { position: fixed; top: 1rem; left: 1rem; }
#comparison-container:fullscreen .view.active { height: 100%; display: flex; flex-direction: column; justify-content: center; }
#comparison-container:fullscreen .comparison-tool { max-height: none; }
#comparison-container:fullscreen .img-container img { max-height: 80vh; }

/* --- Mobile --- */
@media (max-width: 900px) { .control-group-divider { display: none; } .control-group-sub { flex-direction: column; gap: 1rem; } }
@media (max-width: 768px) {
    body { padding: 0; }
    .app-container { padding: 0 1rem; margin-top: 1rem; gap: 1rem; }
    .glass-card { padding: 1.5rem; }
    .setup-manual::after { display: none; }
    .magnify-view-tool, .magnify-view-tool.landscape-mode { grid-template-columns: 1fr; }

    /* --- FIX: Make tool nav visible and functional on mobile --- */
    .tool-navigation-bar { margin-top: 1rem; }
    .tool-nav .nav-links {
        display: flex; /* This OVERRIDES the old rule that was hiding it */
        gap: 1rem; /* Reduce gap to fit more links */
        font-size: 0.85rem; /* Make text slightly smaller */
    }
    .tool-nav .nav-links a {
        padding: 0.5rem; /* Add some padding for easier tapping */
    }
    .tool-nav .nav-links a::after {
        /* Hide the underline animation on mobile for a cleaner look */
        display: none;
    }
    /* --- END FIX --- */
}