:root {
    /* Premium Dark Theme Color Palette */
    --bg-base: #050505;
    --surface: rgba(20, 20, 25, 0.65);
    --surface-border: rgba(255, 255, 255, 0.08);
    --accent: #00f0ff;
    --accent-glow: rgba(0, 240, 255, 0.4);
    --danger: #ff2a5f;
    --danger-glow: rgba(255, 42, 95, 0.4);
    --text-main: #ffffff;
    --text-muted: #888890;
    
    /* Modern System Typography */
    --font-main: -apple-system, BlinkMacSystemFont, "SF Pro Display", "Segoe UI", Roboto, Helvetica, sans-serif;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    user-select: none;
    -webkit-tap-highlight-color: transparent;
}

body {
    background-color: var(--bg-base);
    color: var(--text-main);
    font-family: var(--font-main);
    overflow: hidden;
    height: 100vh;
    width: 100vw;
}

#app {
    position: relative;
    height: 100%;
    width: 100%;
}

/* --- Workspace & Canvas --- */
#workspace {
    position: absolute;
    top: 0; left: 0; width: 100%; height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    background: radial-gradient(circle at center, #111 0%, #000 100%);
}

canvas {
    position: absolute;
    top: 0; left: 0; width: 100%; height: 100%;
    touch-action: none;
    transition: filter 0.4s cubic-bezier(0.25, 0.8, 0.25, 1);
}

body.is-locked canvas {
    filter: brightness(250%) contrast(120%) !important; 
}

/* --- Upload Overlay (Redesigned) --- */
#upload-overlay {
    position: absolute;
    top: 0; left: 0; width: 100%; height: 100%;
    background: var(--bg-base);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 50;
    backdrop-filter: blur(10px);
}

.upload-content {
    text-align: center;
    padding: 50px;
    border-radius: 24px;
    background: var(--surface);
    border: 1px solid var(--surface-border);
    box-shadow: 0 20px 50px rgba(0,0,0,0.5), inset 0 0 0 1px rgba(255,255,255,0.02);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    transform: translateY(0);
    animation: floatIn 0.8s cubic-bezier(0.2, 0.8, 0.2, 1);
}

@keyframes floatIn {
    0% { opacity: 0; transform: translateY(20px) scale(0.95); }
    100% { opacity: 1; transform: translateY(0) scale(1); }
}

.upload-content h1 { 
    font-size: 3.5rem; 
    font-weight: 800;
    letter-spacing: -1px;
    color: var(--text-main); 
    margin-bottom: 8px;
    text-shadow: 0 0 20px rgba(255,255,255,0.2);
}

.upload-content p { 
    margin-bottom: 40px; 
    color: var(--text-muted); 
    font-size: 1.1rem;
    font-weight: 300;
}

.upload-btn {
    background-color: var(--text-main);
    color: #000;
    padding: 16px 36px;
    font-size: 1.1rem;
    font-weight: 600;
    border-radius: 12px;
    cursor: pointer;
    display: inline-block;
    transition: all 0.3s ease;
    box-shadow: 0 10px 20px rgba(255,255,255,0.1);
}

.upload-btn:hover {
    background-color: var(--accent);
    box-shadow: 0 0 25px var(--accent-glow);
    transform: translateY(-2px);
}
.upload-btn:active { transform: translateY(1px); }
#image-upload { display: none; }

.drag-text { margin-top: 20px; font-size: 0.85rem; color: #555; text-transform: uppercase; letter-spacing: 1px;}

/* --- Expandable / Hover Menus (Glassmorphism) --- */
.menu-container {
    position: absolute;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--surface);
    backdrop-filter: blur(25px);
    -webkit-backdrop-filter: blur(25px);
    border: 1px solid var(--surface-border);
    border-radius: 25px;
    z-index: 40;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    transition: all 0.5s cubic-bezier(0.16, 1, 0.3, 1);
    box-shadow: 0 10px 40px rgba(0,0,0,0.8);
    
    max-height: 50px; 
    width: 220px; 
}

.menu-header {
    height: 50px;
    min-height: 50px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    font-weight: 600;
    font-size: 0.95rem;
    color: var(--text-main);
    width: 100%;
    transition: color 0.3s;
}

.menu-content {
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s ease;
    padding: 0 24px 24px 24px;
    width: 100%;
}

.menu-container:hover, .menu-container.active {
    max-height: 80vh; 
    width: 340px;
    border-radius: 20px;
    background: rgba(20, 20, 25, 0.85);
}

.menu-container:hover .menu-header, .menu-container.active .menu-header {
    color: var(--accent);
    text-shadow: 0 0 10px var(--accent-glow);
}

.menu-container:hover .menu-content, .menu-container.active .menu-content {
    opacity: 1;
    pointer-events: auto;
    transition-delay: 0.15s;
}

#unlock-container {
    bottom: auto;
    top: 30px;
    width: 180px;
}
#unlock-container .unlock-header { color: var(--danger); }
#unlock-container:hover, #unlock-container.active { 
    width: 280px; 
    max-height: 180px; 
    border-color: rgba(255, 42, 95, 0.3);
}

/* --- Sliders --- */
.controls-scroll { 
    overflow-y: auto; 
    max-height: calc(80vh - 74px); 
    padding-right: 5px;
}
/* Scrollbar styling */
.controls-scroll::-webkit-scrollbar { width: 4px; }
.controls-scroll::-webkit-scrollbar-thumb { background: rgba(255,255,255,0.2); border-radius: 4px; }

.control-group { margin-bottom: 20px; }
.control-group label { 
    display: flex; justify-content: space-between; 
    font-size: 0.85rem; font-weight: 500;
    color: var(--text-muted); margin-bottom: 8px; 
}
.control-group label span { color: var(--text-main); }

input[type=range] { 
    width: 100%; -webkit-appearance: none; background: transparent; 
}
input[type=range]::-webkit-slider-runnable-track { 
    height: 4px; background: rgba(255,255,255,0.1); border-radius: 2px; 
}
input[type=range]::-webkit-slider-thumb { 
    -webkit-appearance: none; height: 16px; width: 16px; 
    border-radius: 50%; background: var(--text-main); 
    margin-top: -6px; cursor: pointer; 
    transition: 0.2s;
    box-shadow: 0 2px 5px rgba(0,0,0,0.5);
}
input[type=range]:hover::-webkit-slider-thumb, input[type=range]:active::-webkit-slider-thumb {
    background: var(--accent);
    box-shadow: 0 0 12px var(--accent-glow);
    transform: scale(1.2);
}

/* --- Toggles (Custom Checkboxes) --- */
.toggle-group { 
    display: grid; grid-template-columns: 1fr 1fr; 
    gap: 16px 10px; margin: 25px 0; 
}

.checkbox-label { 
    font-size: 0.85rem; font-weight: 500; color: var(--text-muted);
    display: flex; align-items: center; gap: 10px; cursor: pointer; 
    transition: color 0.3s;
}
.checkbox-label:hover { color: var(--text-main); }

/* The Toggle Switch Magic */
.checkbox-label input[type="checkbox"] {
    -webkit-appearance: none; appearance: none;
    width: 36px; height: 20px;
    background: rgba(255,255,255,0.1);
    border-radius: 20px;
    position: relative; outline: none; cursor: pointer;
    transition: background 0.3s ease;
    flex-shrink: 0;
}
.checkbox-label input[type="checkbox"]::after {
    content: ''; position: absolute;
    top: 2px; left: 2px; width: 16px; height: 16px;
    background: var(--text-muted);
    border-radius: 50%;
    transition: transform 0.3s cubic-bezier(0.2, 0.85, 0.32, 1.2), background 0.3s;
}
.checkbox-label input[type="checkbox"]:checked {
    background: var(--accent);
    box-shadow: inset 0 0 0 1px var(--accent-glow);
}
.checkbox-label input[type="checkbox"]:checked::after {
    transform: translateX(16px);
    background: #000;
}

/* --- Buttons --- */
.action-buttons button { 
    width: 100%; padding: 14px; margin-top: 12px; 
    border: 1px solid var(--surface-border); 
    border-radius: 10px; font-weight: 600; font-size: 0.9rem;
    cursor: pointer; background: rgba(255,255,255,0.05); 
    color: var(--text-main); transition: all 0.2s ease;
}
.action-buttons button:hover { background: rgba(255,255,255,0.1); }

.glow-btn { 
    background: var(--accent) !important; 
    color: #000 !important; border: none !important;
}
.glow-btn:hover {
    box-shadow: 0 0 20px var(--accent-glow);
    transform: translateY(-1px);
}

.danger-btn { 
    background: var(--danger) !important; 
    color: #fff !important; border: none !important;
}
.danger-btn:hover {
    box-shadow: 0 0 20px var(--danger-glow);
    transform: translateY(-1px);
}

.hidden { display: none !important; }

/* --- Mobile Responsiveness --- */
@media (max-width: 768px) {
    .menu-container { bottom: 20px; }
    .menu-container:hover, .menu-container.active { width: 92vw; max-height: 85vh; }
    .upload-content { padding: 30px 20px; width: 90vw; }
    .upload-content h1 { font-size: 2.5rem; }
    .controls-scroll { max-height: calc(85vh - 74px); }
}