/**
 * Smart CSC VLE Tools - AI Photo Cleaner & HD Enhancer
 * Modern UI & Split-Comparison Slider Styles
 * Fully Optimized for both Day (Light) and Night (Dark) Modes
 */

:root {
    --primary-color: #f91a2d;
    --primary-hover: #dc2626;
    --emerald: #10b981;
    --emerald-dark: #059669;
    --bg-color: #f8fafc;
    --card-bg: #ffffff;
    --border-color: #e2e8f0;
    --text-color: #0f172a;
    --secondary-text: #475569;
    --accent-bg: #f1f5f9;
    --slider-track: #cbd5e1;
    --slider-thumb: #f91a2d;
    --shadow-sm: 0 1px 3px 0 rgba(0, 0, 0, 0.08);
    --shadow-md: 0 4px 12px -2px rgba(0, 0, 0, 0.08), 0 2px 6px -1px rgba(0, 0, 0, 0.04);
    --shadow-lg: 0 10px 25px -4px rgba(0, 0, 0, 0.1), 0 4px 10px -2px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 35px -6px rgba(0, 0, 0, 0.12), 0 10px 15px -4px rgba(0, 0, 0, 0.06);
}

.dark {
    --bg-color: #0b0f19;
    --card-bg: #131b2e;
    --border-color: #1e293b;
    --text-color: #ffffff;
    --secondary-text: #94a3b8;
    --accent-bg: #1e293b;
    --slider-track: #334155;
    --slider-thumb: #f91a2d;
}

body {
    background-color: var(--bg-color);
    color: var(--text-color);
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    transition: background-color 0.25s ease, color 0.25s ease;
}

/* Explicit heading and text colors for comfort */
.hero-heading {
    color: #0f172a !important;
}

.dark .hero-heading {
    color: #ffffff !important;
}

.hero-subtext {
    color: #475569 !important;
}

.dark .hero-subtext {
    color: #94a3b8 !important;
}

.hero-badge {
    background-color: #fee2e2 !important;
    color: #b91c1c !important;
    border: 1px solid #fecaca !important;
}

.dark .hero-badge {
    background-color: rgba(153, 27, 27, 0.4) !important;
    color: #fca5a5 !important;
    border: 1px solid rgba(239, 68, 68, 0.3) !important;
}

/* Upload Dropzone */
.dropzone-box {
    border: 2px dashed #94a3b8;
    background: var(--card-bg);
    box-shadow: var(--shadow-lg);
    transition: all 0.25s ease-in-out;
}

.dark .dropzone-box {
    border-color: #334155;
}

.dropzone-box:hover, .dropzone-box.dragover {
    border-color: var(--primary-color) !important;
    background: rgba(249, 26, 45, 0.04) !important;
    transform: translateY(-2px);
    box-shadow: var(--shadow-xl);
}

/* Before / After Comparison Slider Container */
.comparison-container {
    position: relative;
    width: 100%;
    max-width: 800px;
    margin: 0 auto;
    overflow: hidden;
    user-select: none;
    background: #0f172a;
    border: 2px solid var(--border-color);
    border-radius: 1.25rem;
    box-shadow: var(--shadow-xl);
    aspect-ratio: 4 / 3;
    display: flex;
    align-items: center;
    justify-content: center;
}

.comparison-image-wrapper {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

.comparison-image-wrapper img, 
.comparison-image-wrapper canvas {
    max-width: 100%;
    max-height: 100%;
    object-fit: contain;
    display: block;
}

.comparison-after-wrapper {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    overflow: hidden;
    z-index: 2;
    clip-path: polygon(0 0, 50% 0, 50% 100%, 0 100%);
    transition: clip-path 0.05s ease-out;
}

/* Draggable Divider Handle */
.comparison-divider {
    position: absolute;
    top: 0;
    bottom: 0;
    left: 50%;
    width: 3px;
    background: #ffffff;
    box-shadow: 0 0 14px rgba(0, 0, 0, 0.6);
    z-index: 10;
    cursor: ew-resize;
    transform: translateX(-50%);
    pointer-events: auto;
}

.comparison-handle {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 44px;
    height: 44px;
    background: #ffffff;
    border: 3.5px solid var(--primary-color);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 6px 18px rgba(0, 0, 0, 0.35);
    color: var(--primary-color);
    font-size: 15px;
    cursor: ew-resize;
    transition: transform 0.15s ease, box-shadow 0.15s ease;
}

.comparison-handle:hover, .comparison-divider.dragging .comparison-handle {
    transform: translate(-50%, -50%) scale(1.15);
    box-shadow: 0 8px 24px rgba(249, 26, 45, 0.6);
}

/* Floating Badges on Comparison */
.badge-before, .badge-after {
    position: absolute;
    top: 14px;
    padding: 5px 14px;
    border-radius: 9999px;
    font-size: 11px;
    font-weight: 800;
    letter-spacing: 0.05em;
    text-transform: uppercase;
    backdrop-filter: blur(8px);
    z-index: 5;
    pointer-events: none;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
}

.badge-before {
    right: 14px;
    background: rgba(15, 23, 42, 0.85);
    color: #ffffff;
    border: 1px solid rgba(255, 255, 255, 0.25);
}

.badge-after {
    left: 14px;
    background: rgba(16, 185, 129, 0.9);
    color: #ffffff;
    border: 1px solid rgba(255, 255, 255, 0.35);
}

/* Mode Selection Tabs */
.mode-tab {
    transition: all 0.2s ease;
    border: 1.5px solid var(--border-color);
    background: var(--card-bg);
    color: var(--text-color);
    font-weight: 700;
}

.mode-tab.active {
    background: linear-gradient(135deg, var(--primary-color) 0%, #dc2626 100%) !important;
    color: #ffffff !important;
    border-color: var(--primary-color) !important;
    box-shadow: 0 4px 14px rgba(249, 26, 45, 0.35) !important;
}

.mode-tab:not(.active):hover {
    background: var(--accent-bg);
    border-color: #94a3b8;
    transform: translateY(-1px);
}

/* Custom Sliders */
input[type="range"] {
    -webkit-appearance: none;
    appearance: none;
    width: 100%;
    height: 7px;
    border-radius: 4px;
    background: var(--slider-track);
    outline: none;
    transition: background 0.2s;
}

input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: var(--slider-thumb);
    cursor: pointer;
    border: 2px solid #ffffff;
    box-shadow: 0 2px 8px rgba(249, 26, 45, 0.45);
    transition: transform 0.15s ease, box-shadow 0.15s ease;
}

input[type="range"]::-webkit-slider-thumb:hover {
    transform: scale(1.2);
    box-shadow: 0 4px 12px rgba(249, 26, 45, 0.6);
}

/* Quick Filter Preset Buttons */
.preset-chip {
    transition: all 0.2s ease;
    border: 1.5px solid var(--border-color);
    background: var(--card-bg);
    color: var(--text-color);
    font-size: 12px;
    font-weight: 600;
}

.preset-chip:hover, .preset-chip.active {
    border-color: var(--primary-color) !important;
    color: var(--primary-color) !important;
    background: rgba(249, 26, 45, 0.08) !important;
    transform: translateY(-1px);
    box-shadow: 0 2px 6px rgba(249, 26, 45, 0.15);
}

/* Buttons */
.btn-cleaner-primary {
    background: linear-gradient(135deg, #f91a2d 0%, #dc2626 100%) !important;
    color: #ffffff !important;
    font-weight: 700;
    transition: all 0.25s ease;
    box-shadow: 0 4px 14px rgba(249, 26, 45, 0.35);
}

.btn-cleaner-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 22px rgba(249, 26, 45, 0.5);
}

.btn-cleaner-success {
    background: linear-gradient(135deg, #10b981 0%, #059669 100%) !important;
    color: #ffffff !important;
    font-weight: 700;
    transition: all 0.25s ease;
    box-shadow: 0 4px 14px rgba(16, 185, 129, 0.35);
}

.btn-cleaner-success:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 22px rgba(16, 185, 129, 0.5);
}

/* Dropdown Selects in Day and Dark Mode */
.tool-select {
    border: 1.5px solid var(--border-color) !important;
    background-color: var(--accent-bg) !important;
    color: var(--text-color) !important;
    font-weight: 600;
    font-size: 12px;
}

/* Toast animations */
.photo-toast {
    animation: toastSlideIn 0.3s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

@keyframes toastSlideIn {
    from {
        opacity: 0;
        transform: translateY(20px) scale(0.95);
    }
    to {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}