/* ============================================
   SMP MOCKUP TOOL - APPLE LIQUID GLASS THEME
   Frosted glass, soft depth, fluid aesthetics
   ============================================ */

/* CSS Variables */
:root {
    /* Dark glass palette */
    --bg-void: #000000;
    --bg-deep: #0a0a0c;
    --bg-base: #111114;
    --bg-elevated: #18181c;
    --bg-surface: #1c1c21;

    /* Glass effects */
    --glass-bg: rgba(28, 28, 33, 0.72);
    --glass-bg-light: rgba(38, 38, 45, 0.65);
    --glass-border: rgba(255, 255, 255, 0.08);
    --glass-border-light: rgba(255, 255, 255, 0.12);
    --glass-shine: linear-gradient(135deg, rgba(255,255,255,0.1) 0%, transparent 50%);
    --glass-inner-glow: inset 0 1px 1px rgba(255, 255, 255, 0.05);

    /* Accent - warm gold to match main site */
    --accent: #d4af37;
    --accent-light: #e8c85a;
    --accent-dark: #b8941f;
    --accent-glow: rgba(212, 175, 55, 0.25);
    --accent-subtle: rgba(212, 175, 55, 0.08);

    /* Text colors */
    --text-primary: #f5f5f7;
    --text-secondary: rgba(245, 245, 247, 0.72);
    --text-tertiary: rgba(245, 245, 247, 0.48);
    --text-quaternary: rgba(245, 245, 247, 0.32);

    /* Functional colors */
    --success: #32d74b;
    --warning: #ffd60a;
    --error: #ff453a;

    /* Shadows */
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 16px 48px rgba(0, 0, 0, 0.5);
    --shadow-glow: 0 0 40px var(--accent-glow);
    --shadow-inset: inset 0 0 0 1px rgba(255, 255, 255, 0.05);

    /* Typography */
    --font-primary: -apple-system, BlinkMacSystemFont, 'SF Pro Display', 'Segoe UI', sans-serif;
    --font-mono: 'SF Mono', 'Fira Code', monospace;

    /* Spacing & Radius */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --radius-2xl: 32px;

    /* Transitions */
    --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
    --ease-spring: cubic-bezier(0.34, 1.56, 0.64, 1);
    --duration-fast: 0.2s;
    --duration-base: 0.35s;
    --duration-slow: 0.5s;
}

/* Reset & Base */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-primary);
    background: var(--bg-void);
    color: var(--text-primary);
    min-height: 100vh;
    overflow-x: hidden;
    line-height: 1.5;
}

/* ============================================
   AMBIENT BACKGROUND
   ============================================ */

.ambient-bg {
    position: fixed;
    inset: 0;
    pointer-events: none;
    z-index: 0;
    overflow: hidden;
    background:
        radial-gradient(ellipse 80% 50% at 50% -20%, rgba(212, 175, 55, 0.08) 0%, transparent 50%),
        radial-gradient(ellipse 60% 40% at 100% 100%, rgba(212, 175, 55, 0.05) 0%, transparent 40%),
        var(--bg-deep);
}

.ambient-orb {
    position: absolute;
    border-radius: 50%;
    filter: blur(100px);
    mix-blend-mode: screen;
}

.ambient-orb-1 {
    width: 500px;
    height: 500px;
    background: radial-gradient(circle, rgba(212, 175, 55, 0.15) 0%, transparent 70%);
    top: -150px;
    right: -100px;
    animation: floatSlow 25s ease-in-out infinite;
}

.ambient-orb-2 {
    width: 400px;
    height: 400px;
    background: radial-gradient(circle, rgba(184, 148, 31, 0.1) 0%, transparent 70%);
    bottom: -100px;
    left: -100px;
    animation: floatSlow 30s ease-in-out infinite reverse;
}

@keyframes floatSlow {
    0%, 100% { transform: translate(0, 0) scale(1); opacity: 0.6; }
    50% { transform: translate(20px, -20px) scale(1.05); opacity: 0.8; }
}

/* ============================================
   LIQUID GLASS COMPONENT
   ============================================ */

.liquid-glass {
    background: var(--glass-bg);
    backdrop-filter: blur(40px) saturate(180%);
    -webkit-backdrop-filter: blur(40px) saturate(180%);
    border: 1px solid var(--glass-border);
    box-shadow:
        var(--shadow-inset),
        var(--glass-inner-glow),
        var(--shadow-md);
    position: relative;
}

.liquid-glass::before {
    content: '';
    position: absolute;
    inset: 0;
    border-radius: inherit;
    background: var(--glass-shine);
    pointer-events: none;
}

/* ============================================
   HEADER
   ============================================ */

.tool-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 12px 24px;
    background: rgba(10, 10, 12, 0.7);
    backdrop-filter: blur(40px) saturate(180%);
    -webkit-backdrop-filter: blur(40px) saturate(180%);
    border-bottom: 1px solid var(--glass-border);
}

.header-logo {
    display: flex;
    align-items: center;
    gap: 12px;
    text-decoration: none;
}

.header-logo img {
    width: 36px;
    height: 36px;
    object-fit: contain;
}

.logo-text {
    display: flex;
    flex-direction: column;
    gap: 0;
}

.logo-name {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
    letter-spacing: 1.5px;
}

.logo-tag {
    font-size: 0.6rem;
    font-weight: 500;
    color: var(--accent);
    letter-spacing: 0.5px;
    text-transform: uppercase;
    opacity: 0.9;
}

.header-nav {
    display: flex;
    align-items: center;
    gap: 8px;
}

.nav-link {
    padding: 8px 16px;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-secondary);
    text-decoration: none;
    border-radius: var(--radius-md);
    transition: all var(--duration-fast) var(--ease-out);
}

.nav-link:hover {
    color: var(--text-primary);
    background: rgba(255, 255, 255, 0.05);
}

.nav-link.btn-book {
    background: var(--accent);
    color: #000;
    font-weight: 600;
}

.nav-link.btn-book:hover {
    background: var(--accent-light);
    box-shadow: var(--shadow-glow);
    transform: translateY(-1px);
}

/* ============================================
   APP CONTAINER
   ============================================ */

.app-container {
    position: relative;
    z-index: 1;
    min-height: 100vh;
    padding-top: 64px;
}

.app-section {
    display: none;
    animation: fadeSlideIn 0.5s var(--ease-out);
}

.app-section.active {
    display: block;
}

@keyframes fadeSlideIn {
    from { opacity: 0; transform: translateY(16px); }
    to { opacity: 1; transform: translateY(0); }
}

/* ============================================
   UPLOAD SECTION
   ============================================ */

.upload-wrapper {
    max-width: 580px;
    margin: 0 auto;
    padding: 80px 24px;
    display: flex;
    flex-direction: column;
    align-items: center;
    min-height: calc(100vh - 64px);
    justify-content: center;
}

.upload-hero {
    text-align: center;
    margin-bottom: 48px;
}

.hero-title {
    font-size: 3rem;
    font-weight: 600;
    line-height: 1.1;
    margin-bottom: 12px;
    letter-spacing: -0.03em;
    background: linear-gradient(180deg, var(--text-primary) 0%, var(--text-secondary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.title-accent {
    background: linear-gradient(135deg, var(--accent) 0%, var(--accent-light) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 1.125rem;
    color: var(--text-tertiary);
    font-weight: 400;
}

/* Upload Card - Liquid Glass */
.upload-card {
    width: 100%;
    padding: 56px 40px;
    background: var(--glass-bg);
    backdrop-filter: blur(40px) saturate(180%);
    -webkit-backdrop-filter: blur(40px) saturate(180%);
    border: 1.5px dashed var(--glass-border-light);
    border-radius: var(--radius-2xl);
    text-align: center;
    cursor: pointer;
    transition: all var(--duration-base) var(--ease-out);
    position: relative;
    overflow: hidden;
}

.upload-card::before {
    content: '';
    position: absolute;
    inset: 0;
    background: var(--glass-shine);
    border-radius: inherit;
    pointer-events: none;
    opacity: 0.5;
}

.upload-card::after {
    content: '';
    position: absolute;
    inset: -1px;
    background: linear-gradient(135deg, var(--accent-subtle) 0%, transparent 50%);
    border-radius: inherit;
    opacity: 0;
    transition: opacity var(--duration-base) var(--ease-out);
    pointer-events: none;
}

.upload-card:hover {
    border-color: rgba(212, 175, 55, 0.3);
    transform: translateY(-2px);
    box-shadow:
        var(--shadow-lg),
        0 0 60px rgba(212, 175, 55, 0.1);
}

.upload-card:hover::after {
    opacity: 1;
}

.upload-card.dragover {
    border-color: var(--accent);
    background: rgba(212, 175, 55, 0.05);
    box-shadow:
        var(--shadow-lg),
        0 0 80px rgba(212, 175, 55, 0.15);
}

.upload-icon {
    width: 72px;
    height: 72px;
    margin: 0 auto 20px;
    color: var(--accent);
    position: relative;
    z-index: 1;
    opacity: 0.8;
    transition: all var(--duration-base) var(--ease-out);
}

.upload-card:hover .upload-icon {
    opacity: 1;
    transform: scale(1.05);
}

.upload-icon svg {
    width: 100%;
    height: 100%;
}

.upload-title {
    font-size: 1.375rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 6px;
    position: relative;
    z-index: 1;
}

.upload-text {
    color: var(--text-tertiary);
    margin-bottom: 12px;
    position: relative;
    z-index: 1;
}

.upload-formats {
    font-size: 0.8rem;
    font-family: var(--font-mono);
    color: var(--text-quaternary);
    position: relative;
    z-index: 1;
}

/* Upload Tips */
.upload-tips {
    display: flex;
    flex-direction: column;
    gap: 8px;
    margin-top: 32px;
    width: 100%;
}

.tip-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 16px;
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-lg);
    transition: all var(--duration-fast) var(--ease-out);
}

.tip-item:hover {
    background: var(--glass-bg-light);
    border-color: var(--glass-border-light);
}

.tip-item svg {
    width: 18px;
    height: 18px;
    color: var(--accent);
    flex-shrink: 0;
    opacity: 0.8;
}

.tip-item span {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

/* ============================================
   EDITOR SECTION
   ============================================ */

#editor-section {
    height: calc(100vh - 64px);
}

.editor-layout {
    display: flex;
    height: 100%;
}

/* Canvas Area */
.canvas-area {
    flex: 1;
    display: flex;
    flex-direction: column;
    background: var(--bg-void);
    position: relative;
}

.canvas-toolbar {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    padding: 16px 24px;
    background: var(--glass-bg);
    backdrop-filter: blur(40px) saturate(180%);
    -webkit-backdrop-filter: blur(40px) saturate(180%);
    border-bottom: 1px solid var(--glass-border);
}

/* Toolbar Buttons - Pill Style */
.toolbar-btn {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 10px 20px;
    font-family: var(--font-primary);
    font-size: 0.9rem;
    font-weight: 600;
    color: #000;
    background: var(--accent);
    border: none;
    border-radius: var(--radius-lg);
    cursor: pointer;
    transition: all var(--duration-fast) var(--ease-out);
    position: relative;
    overflow: hidden;
}

.toolbar-btn::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(180deg, rgba(255,255,255,0.2) 0%, transparent 50%);
    pointer-events: none;
}

.toolbar-btn svg {
    width: 18px;
    height: 18px;
}

.toolbar-btn:hover {
    background: var(--accent-light);
    box-shadow: var(--shadow-glow);
    transform: translateY(-1px);
}

.toolbar-btn:active {
    transform: translateY(0);
}

.toolbar-btn.secondary {
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    color: var(--text-secondary);
    border: 1px solid var(--glass-border);
}

.toolbar-btn.secondary::before {
    background: var(--glass-shine);
}

.toolbar-btn.secondary:hover {
    background: var(--glass-bg-light);
    color: var(--text-primary);
    border-color: var(--glass-border-light);
    box-shadow: var(--shadow-sm);
    transform: translateY(-1px);
}

/* Canvas Wrapper */
.canvas-wrapper {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 32px;
    overflow: auto;
    background:
        radial-gradient(ellipse 50% 50% at 50% 50%, rgba(212, 175, 55, 0.02) 0%, transparent 70%),
        var(--bg-void);
    position: relative;
}

/* Before Image Overlay */
.before-overlay {
    position: absolute;
    bottom: 50px;
    right: 50px;
    width: 120px;
    border-radius: var(--radius-md);
    overflow: hidden;
    box-shadow: var(--shadow-lg), 0 0 0 2px rgba(255, 255, 255, 0.15);
    opacity: 0;
    transform: scale(0.9);
    transition: all 0.3s ease;
    cursor: pointer;
    z-index: 10;
}

.before-overlay.visible {
    opacity: 1;
    transform: scale(1);
}

.before-overlay:hover {
    transform: scale(1.05);
    box-shadow: var(--shadow-lg), 0 0 0 2px var(--accent);
}

.before-overlay img {
    width: 100%;
    height: 150px;
    object-fit: cover;
    object-position: top;
    display: block;
}

.before-label {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    background: linear-gradient(transparent, rgba(0, 0, 0, 0.8));
    color: white;
    padding: 20px 8px 8px;
    font-size: 10px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1px;
    text-align: center;
}

@media (max-width: 768px) {
    .before-overlay {
        bottom: 20px;
        right: 20px;
        width: 80px;
    }

    .before-overlay img {
        height: 100px;
    }

    .before-label {
        font-size: 8px;
        padding: 15px 5px 5px;
    }
}

.canvas-container {
    position: relative;
    background: #000;
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow:
        0 0 0 1px var(--glass-border),
        var(--shadow-lg);
}

#backgroundCanvas,
#maskCanvas,
#drawingCanvas {
    position: absolute;
    top: 0;
    left: 0;
    display: block;
}

#backgroundCanvas { z-index: 1; }
#maskCanvas { z-index: 2; pointer-events: none; }
#drawingCanvas { z-index: 3; cursor: crosshair; }

/* Control Points */
.control-points-layer {
    position: absolute;
    inset: 0;
    z-index: 4;
    pointer-events: none;
}

.control-point {
    position: absolute;
    width: 14px;
    height: 14px;
    background: var(--accent);
    border: 2.5px solid white;
    border-radius: 50%;
    cursor: grab;
    transform: translate(-50%, -50%);
    pointer-events: auto;
    transition: all var(--duration-fast) var(--ease-spring);
    box-shadow:
        0 2px 8px rgba(0, 0, 0, 0.4),
        0 0 0 1px rgba(212, 175, 55, 0.3);
}

.control-point:hover {
    transform: translate(-50%, -50%) scale(1.3);
    box-shadow:
        0 4px 16px rgba(0, 0, 0, 0.5),
        0 0 20px var(--accent-glow);
}

.control-point:active {
    cursor: grabbing;
    transform: translate(-50%, -50%) scale(1.1);
}

.control-point.first-point {
    width: 18px;
    height: 18px;
    background: var(--success);
    box-shadow:
        0 2px 8px rgba(0, 0, 0, 0.4),
        0 0 16px rgba(50, 215, 75, 0.4);
}

/* Canvas Instructions */
.canvas-instructions {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 12px 24px;
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    border-top: 1px solid var(--glass-border);
}

.instruction-icon svg {
    width: 16px;
    height: 16px;
    color: var(--accent);
    opacity: 0.7;
}

.canvas-instructions span {
    font-size: 0.8rem;
    color: var(--text-tertiary);
}

/* ============================================
   CONTROL PANEL - LIQUID GLASS SIDEBAR
   ============================================ */

.control-panel {
    width: 320px;
    background: var(--glass-bg);
    backdrop-filter: blur(40px) saturate(180%);
    -webkit-backdrop-filter: blur(40px) saturate(180%);
    border-left: 1px solid var(--glass-border);
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    position: relative;
}

.control-panel::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 120px;
    background: linear-gradient(180deg, rgba(212, 175, 55, 0.03) 0%, transparent 100%);
    pointer-events: none;
}

.panel-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 20px 24px;
    border-bottom: 1px solid var(--glass-border);
    position: sticky;
    top: 0;
    background: var(--glass-bg);
    backdrop-filter: blur(40px);
    z-index: 10;
}

.panel-title {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-primary);
}

.panel-reset {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 6px 12px;
    font-family: var(--font-primary);
    font-size: 0.75rem;
    font-weight: 500;
    color: var(--text-tertiary);
    background: transparent;
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all var(--duration-fast) var(--ease-out);
}

.panel-reset svg {
    width: 12px;
    height: 12px;
}

.panel-reset:hover {
    color: var(--text-secondary);
    border-color: var(--glass-border-light);
    background: rgba(255, 255, 255, 0.03);
}

/* Slider Groups */
.slider-group {
    padding: 18px 24px;
    border-bottom: 1px solid var(--glass-border);
}

.slider-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 14px;
}

.slider-label {
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--text-primary);
}

.slider-value {
    font-family: var(--font-mono);
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--accent);
    min-width: 42px;
    text-align: right;
}

/* Pigment Preview */
.pigment-preview {
    display: flex;
    gap: 3px;
    margin-right: auto;
    margin-left: 12px;
}

.pigment-dot {
    width: 10px;
    height: 10px;
    border-radius: 2px;
    transition: background var(--duration-fast);
}

.pigment-dot:nth-child(1) { background: #1a1a1a; }
.pigment-dot:nth-child(2) { background: #2d2d2d; }
.pigment-dot:nth-child(3) { background: #454545; }
.pigment-dot:nth-child(4) { background: #5c5c5c; }
.pigment-dot:nth-child(5) { background: #787878; }

/* Sliders - Refined */
.slider {
    width: 100%;
    height: 6px;
    -webkit-appearance: none;
    appearance: none;
    background: var(--bg-elevated);
    border-radius: 3px;
    outline: none;
    cursor: pointer;
    position: relative;
}

.slider::-webkit-slider-track {
    height: 6px;
    background: var(--bg-elevated);
    border-radius: 3px;
}

.slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 18px;
    height: 18px;
    background: var(--accent);
    border: 3px solid var(--bg-surface);
    border-radius: 50%;
    cursor: pointer;
    box-shadow:
        0 2px 6px rgba(0, 0, 0, 0.3),
        0 0 0 1px rgba(212, 175, 55, 0.2);
    transition: all var(--duration-fast) var(--ease-spring);
}

.slider::-webkit-slider-thumb:hover {
    transform: scale(1.15);
    box-shadow:
        0 4px 12px rgba(0, 0, 0, 0.4),
        0 0 16px var(--accent-glow);
}

.slider::-moz-range-track {
    height: 6px;
    background: var(--bg-elevated);
    border-radius: 3px;
    border: none;
}

.slider::-moz-range-thumb {
    width: 18px;
    height: 18px;
    background: var(--accent);
    border: 3px solid var(--bg-surface);
    border-radius: 50%;
    cursor: pointer;
}

.slider-gradient {
    background: linear-gradient(to right, #1a1a1a 0%, #787878 100%);
}

.slider-hints {
    display: flex;
    justify-content: space-between;
    margin-top: 10px;
    font-size: 0.7rem;
    color: var(--text-quaternary);
}

.slider-hints span:nth-child(2) {
    flex: 1;
    text-align: center;
    color: var(--text-tertiary);
    font-style: italic;
    padding: 0 8px;
}

.slider-description {
    margin-top: 10px;
    font-size: 0.75rem;
    color: var(--text-tertiary);
    font-style: italic;
}

/* Panel Actions */
.panel-actions {
    padding: 24px;
    margin-top: auto;
}

/* Action Buttons */
.action-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    width: 100%;
    padding: 12px 20px;
    font-family: var(--font-primary);
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text-secondary);
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-lg);
    cursor: pointer;
    text-decoration: none;
    transition: all var(--duration-fast) var(--ease-out);
    position: relative;
    overflow: hidden;
}

.action-btn::before {
    content: '';
    position: absolute;
    inset: 0;
    background: var(--glass-shine);
    opacity: 0.5;
    pointer-events: none;
}

.action-btn svg {
    width: 18px;
    height: 18px;
}

.action-btn:hover {
    background: var(--glass-bg-light);
    color: var(--text-primary);
    border-color: var(--glass-border-light);
    transform: translateY(-1px);
}

.action-btn.primary {
    background: var(--accent);
    color: #000;
    border: none;
}

.action-btn.primary::before {
    background: linear-gradient(180deg, rgba(255,255,255,0.25) 0%, transparent 50%);
}

.action-btn.primary:hover {
    background: var(--accent-light);
    box-shadow: var(--shadow-glow);
    transform: translateY(-2px);
}

.action-btn.secondary {
    background: transparent;
    border-color: var(--glass-border-light);
}

/* ============================================
   COMPARISON SECTION
   ============================================ */

.comparison-wrapper {
    max-width: 880px;
    margin: 0 auto;
    padding: 60px 24px 80px;
}

.comparison-title {
    font-size: 2.25rem;
    font-weight: 600;
    text-align: center;
    margin-bottom: 40px;
    letter-spacing: -0.02em;
}

.comparison-container {
    margin-bottom: 40px;
}

/* Before/After Slider */
.before-after-slider {
    position: relative;
    width: 100%;
    aspect-ratio: 4/3;
    border-radius: var(--radius-xl);
    overflow: hidden;
    background: #000;
    box-shadow:
        0 0 0 1px var(--glass-border),
        var(--shadow-lg);
}

.before-after-wrapper {
    position: relative;
    width: 100%;
    height: 100%;
    display: flex;
}

.before-side,
.after-side {
    position: relative;
    width: 50%;
    height: 100%;
    overflow: hidden;
}

.comparison-img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.comparison-label {
    position: absolute;
    top: 16px;
    left: 16px;
    padding: 8px 14px;
    background: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 20px;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--text-primary);
}

.comparison-label.after {
    left: auto;
    right: 16px;
}

.slider-divider {
    position: absolute;
    top: 0;
    left: 50%;
    width: 2px;
    height: 100%;
    background: rgba(255, 255, 255, 0.9);
    transform: translateX(-50%);
    z-index: 10;
    box-shadow: 0 0 20px rgba(255, 255, 255, 0.3);
}

.slider-handle {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 44px;
    height: 44px;
    background: var(--accent);
    border: 3px solid white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: grab;
    box-shadow:
        0 4px 16px rgba(0, 0, 0, 0.4),
        0 0 24px var(--accent-glow);
    transition: all var(--duration-fast) var(--ease-spring);
}

.slider-handle::before {
    content: '';
    position: absolute;
    inset: 0;
    border-radius: 50%;
    background: linear-gradient(180deg, rgba(255,255,255,0.3) 0%, transparent 50%);
    pointer-events: none;
}

.slider-handle:hover {
    transform: translate(-50%, -50%) scale(1.1);
    box-shadow:
        0 6px 24px rgba(0, 0, 0, 0.5),
        0 0 32px var(--accent-glow);
}

.slider-handle:active {
    cursor: grabbing;
    transform: translate(-50%, -50%) scale(1.05);
}

.slider-handle svg {
    width: 18px;
    height: 18px;
    color: #000;
}

/* Comparison Actions */
.comparison-actions {
    display: flex;
    justify-content: center;
    gap: 12px;
    flex-wrap: wrap;
}

/* CTA Banner - Liquid Glass */
.cta-banner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 32px;
    padding: 28px 32px;
    margin-top: 48px;
    background: var(--glass-bg);
    backdrop-filter: blur(40px) saturate(180%);
    -webkit-backdrop-filter: blur(40px) saturate(180%);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-xl);
    position: relative;
    overflow: hidden;
}

.cta-banner::before {
    content: '';
    position: absolute;
    inset: 0;
    background: var(--glass-shine);
    pointer-events: none;
}

.cta-content {
    position: relative;
    z-index: 1;
}

.cta-content h3 {
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 4px;
}

.cta-content p {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin: 0;
}

.cta-btn {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 12px 24px;
    font-family: var(--font-primary);
    font-size: 0.9rem;
    font-weight: 600;
    color: #000;
    background: var(--accent);
    border: none;
    border-radius: var(--radius-lg);
    text-decoration: none;
    white-space: nowrap;
    transition: all var(--duration-fast) var(--ease-out);
    position: relative;
    z-index: 1;
}

.cta-btn::before {
    content: '';
    position: absolute;
    inset: 0;
    border-radius: inherit;
    background: linear-gradient(180deg, rgba(255,255,255,0.25) 0%, transparent 50%);
    pointer-events: none;
}

.cta-btn svg {
    width: 18px;
    height: 18px;
}

.cta-btn:hover {
    background: var(--accent-light);
    box-shadow: var(--shadow-glow);
    transform: translateY(-2px);
}

/* ============================================
   RESPONSIVE DESIGN
   ============================================ */

@media (max-width: 1024px) {
    .editor-layout {
        flex-direction: column;
    }

    .control-panel {
        width: 100%;
        max-height: 45vh;
        border-left: none;
        border-top: 1px solid var(--glass-border);
    }

    .canvas-area {
        min-height: 55vh;
    }
}

@media (max-width: 768px) {
    .tool-header {
        padding: 10px 16px;
    }

    .header-nav {
        gap: 4px;
    }

    .nav-link:not(.btn-book) {
        display: none;
    }

    .hero-title {
        font-size: 2.25rem;
    }

    .upload-wrapper {
        padding: 60px 20px;
    }

    .upload-card {
        padding: 40px 24px;
    }

    .canvas-toolbar {
        flex-wrap: wrap;
        gap: 8px;
        padding: 12px 16px;
    }

    .toolbar-btn {
        padding: 10px 16px;
        font-size: 0.85rem;
    }

    .slider-group {
        padding: 14px 20px;
    }

    .comparison-wrapper {
        padding: 40px 20px 60px;
    }

    .comparison-actions {
        flex-direction: column;
    }

    .comparison-actions .action-btn {
        width: 100%;
    }

    .cta-banner {
        flex-direction: column;
        text-align: center;
        padding: 24px;
        gap: 20px;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 1.875rem;
    }

    .hero-subtitle {
        font-size: 1rem;
    }

    .upload-icon {
        width: 56px;
        height: 56px;
    }

    .upload-title {
        font-size: 1.2rem;
    }

    .panel-header {
        padding: 16px 20px;
    }

    .panel-title {
        font-size: 1rem;
    }

    .comparison-title {
        font-size: 1.75rem;
    }
}

/* Touch Device Optimizations */
@media (hover: none) and (pointer: coarse) {
    .control-point {
        width: 20px;
        height: 20px;
    }

    .slider::-webkit-slider-thumb {
        width: 24px;
        height: 24px;
    }

    .action-btn {
        min-height: 48px;
    }

    .toolbar-btn {
        min-height: 44px;
    }
}

/* Focus Styles */
.action-btn:focus-visible,
.toolbar-btn:focus-visible,
.slider:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 2px;
}

/* Print Styles */
@media print {
    .tool-header,
    .canvas-toolbar,
    .canvas-instructions,
    .control-panel,
    .comparison-actions,
    .cta-banner,
    .ambient-bg {
        display: none !important;
    }

    .app-container {
        padding-top: 0;
    }
}

/* ============================================
   SCROLLBAR STYLING
   ============================================ */

::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: var(--bg-base);
}

::-webkit-scrollbar-thumb {
    background: var(--glass-border-light);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: rgba(255, 255, 255, 0.2);
}

/* ============================================
   PRESET SECTION
   ============================================ */

.preset-section {
    padding: 16px 24px;
    border-bottom: 1px solid var(--glass-border);
    background: var(--accent-subtle);
}

.preset-header {
    margin-bottom: 12px;
}

.preset-controls {
    display: flex;
    gap: 8px;
    margin-bottom: 10px;
}

.preset-select {
    flex: 1;
    padding: 10px 14px;
    font-family: var(--font-primary);
    font-size: 0.85rem;
    color: var(--text-primary);
    background: var(--bg-elevated);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all var(--duration-fast) var(--ease-out);
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' fill='%23f5f5f7' viewBox='0 0 16 16'%3E%3Cpath d='M7.247 11.14 2.451 5.658C1.885 5.013 2.345 4 3.204 4h9.592a1 1 0 0 1 .753 1.659l-4.796 5.48a1 1 0 0 1-1.506 0z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 12px center;
    padding-right: 36px;
}

.preset-select:hover {
    border-color: var(--glass-border-light);
}

.preset-select:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 2px var(--accent-glow);
}

.preset-select option {
    background: var(--bg-elevated);
    color: var(--text-primary);
}

.preset-save {
    display: flex;
    gap: 8px;
}

.preset-input {
    flex: 1;
    padding: 10px 14px;
    font-family: var(--font-primary);
    font-size: 0.85rem;
    color: var(--text-primary);
    background: var(--bg-elevated);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-sm);
    transition: all var(--duration-fast) var(--ease-out);
}

.preset-input::placeholder {
    color: var(--text-quaternary);
}

.preset-input:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 2px var(--accent-glow);
}

.preset-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    padding: 0;
    background: var(--bg-elevated);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all var(--duration-fast) var(--ease-out);
}

.preset-btn svg {
    width: 16px;
    height: 16px;
    color: var(--text-tertiary);
    transition: color var(--duration-fast);
}

.preset-btn:hover {
    border-color: var(--glass-border-light);
    background: var(--glass-bg-light);
}

.preset-btn:hover svg {
    color: var(--text-secondary);
}

.preset-btn.save:hover {
    border-color: var(--accent);
}

.preset-btn.save:hover svg {
    color: var(--accent);
}

.preset-btn.delete:hover {
    border-color: var(--error);
}

.preset-btn.delete:hover svg {
    color: var(--error);
}

/* ============================================
   COLOR PICKER
   ============================================ */

.color-group {
    padding-bottom: 18px;
}

.color-picker-wrapper {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-left: auto;
}

.color-preview {
    width: 24px;
    height: 24px;
    border-radius: 6px;
    background: #1a1a1a;
    border: 2px solid var(--glass-border-light);
    box-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.3);
}

.color-picker {
    width: 24px;
    height: 24px;
    padding: 0;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    opacity: 0;
    position: absolute;
}

.color-picker-wrapper {
    position: relative;
}

.color-picker-wrapper::after {
    content: '';
    position: absolute;
    right: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 14px;
    height: 14px;
    background: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='14' height='14' fill='%23f5f5f7' viewBox='0 0 16 16'%3E%3Cpath d='M12.146.146a.5.5 0 0 1 .708 0l3 3a.5.5 0 0 1 0 .708l-10 10a.5.5 0 0 1-.168.11l-5 2a.5.5 0 0 1-.65-.65l2-5a.5.5 0 0 1 .11-.168l10-10zM11.207 2.5 13.5 4.793 14.793 3.5 12.5 1.207 11.207 2.5zm1.586 3L10.5 3.207 4 9.707V10h.5a.5.5 0 0 1 .5.5v.5h.5a.5.5 0 0 1 .5.5v.5h.293l6.5-6.5zm-9.761 5.175-.106.106-1.528 3.821 3.821-1.528.106-.106A.5.5 0 0 1 5 12.5V12h-.5a.5.5 0 0 1-.5-.5V11h-.5a.5.5 0 0 1-.468-.325z'/%3E%3C/svg%3E") no-repeat center;
    pointer-events: none;
    opacity: 0.5;
}

/* ============================================
   PRESET NOTIFICATION
   ============================================ */

.preset-notification {
    position: fixed;
    bottom: 24px;
    left: 50%;
    transform: translateX(-50%) translateY(20px);
    padding: 12px 24px;
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--text-primary);
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--accent);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-glow), var(--shadow-md);
    opacity: 0;
    z-index: 9999;
    transition: all var(--duration-base) var(--ease-out);
}

.preset-notification.show {
    opacity: 1;
    transform: translateX(-50%) translateY(0);
}

/* ============================================
   RESPONSIVE ADJUSTMENTS FOR NEW FEATURES
   ============================================ */

@media (max-width: 768px) {
    .preset-section {
        padding: 14px 20px;
    }

    .preset-controls,
    .preset-save {
        gap: 6px;
    }

    .preset-select,
    .preset-input {
        padding: 8px 12px;
        font-size: 0.8rem;
    }

    .preset-btn {
        width: 36px;
        height: 36px;
    }

    .preset-btn svg {
        width: 14px;
        height: 14px;
    }

    .color-preview {
        width: 20px;
        height: 20px;
    }
}