/* Base Variables & Setup */
:root {
    --bg-color: #111115;
    --text-color: #f0f0f5;
    --card-bg: rgba(255, 255, 255, 0.05);
    --card-border: rgba(255, 255, 255, 0.1);
    --accent: #6b4cff;
    --accent-hover: #8167ff;
    --btn-bg: rgba(255, 255, 255, 0.1);
    --btn-hover: rgba(255, 255, 255, 0.15);
}

body {
    background-color: var(--bg-color);
    color: var(--text-color);
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    margin: 0;
    padding: 0;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.app-container {
    max-width: 1000px;
    margin: 2rem auto;
    padding: 0 1rem;
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.app-header {
    text-align: center;
    margin-bottom: 2rem;
}

.app-header h1 {
    font-size: 2rem;
    margin-bottom: 0.5rem;
}

#status-text {
    color: #a1a1aa;
    font-size: 0.95rem;
}

/* Glassmorphism Card */
.glass-card {
    background: var(--card-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--card-border);
    border-radius: 16px;
    padding: 1.5rem;
    width: 100%;
    box-sizing: border-box;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
}

/* Toolbar Controls */
.toolbar {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
    margin-bottom: 1.5rem;
    align-items: center;
    justify-content: center;
}

button,
.btn-primary {
    border: none;
    border-radius: 8px;
    padding: 0.75rem 1.2rem;
    font-size: 0.95rem;
    cursor: pointer;
    font-weight: 600;
    transition: all 0.2s ease;
    color: #fff;
    text-align: center;
}

.btn-primary {
    background: var(--btn-bg);
    border: 1px solid var(--card-border);
}

.btn-primary:hover {
    background: var(--btn-hover);
}

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

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.05);
}

.btn-accent {
    background: var(--accent);
    box-shadow: 0 4px 14px rgba(107, 76, 255, 0.4);
}

.btn-accent:hover {
    background: var(--accent-hover);
}

.btn-accent:disabled {
    background: #333;
    color: #777;
    cursor: not-allowed;
    box-shadow: none;
    opacity: 0.6;
}

button:disabled:not(.btn-accent) {
    background: rgba(255, 255, 255, 0.05);
    color: #666;
    border-color: rgba(255, 255, 255, 0.05);
    cursor: not-allowed;
    opacity: 0.6;
}

label.btn-primary.disabled {
    opacity: 0.5;
    cursor: not-allowed;
    pointer-events: none;
    background: rgba(255, 255, 255, 0.05);
}

/* Progress Bar */
.progress-container {
    width: 100%;
    max-width: 300px;
    height: 4px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 10px;
    margin: 1rem auto 0;
    overflow: hidden;
    position: relative;
}

.progress-bar {
    width: 40%;
    height: 100%;
    background: var(--accent);
    border-radius: 10px;
    position: absolute;
    animation: progress-slide 1.5s infinite ease-in-out;
}

@keyframes progress-slide {
    0% { left: -40%; }
    100% { left: 100%; }
}

.brush-controls {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    background: rgba(0, 0, 0, 0.2);
    padding: 0.5rem 1rem;
    border-radius: 8px;
}

.brush-controls input[type=range] {
    accent-color: var(--accent);
}

/* Canvas Area */
.canvas-wrapper {
    position: relative;
    width: 100%;
    max-width: 512px;
    margin: 0 auto;
    background: #000;
    border-radius: 8px;
    overflow: hidden;
    border: 1px solid var(--card-border);
}

canvas {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    touch-action: none;
}

#mask-canvas {
    cursor: crosshair;
    z-index: 10;
}

.hint {
    text-align: center;
    font-size: 0.85rem;
    color: #888;
    margin-top: 1rem;
}

@media (max-width: 600px) {
    .toolbar {
        flex-direction: column;
        width: 100%;
    }

    button,
    .btn-primary,
    .brush-controls {
        width: 100%;
        justify-content: center;
        box-sizing: border-box;
    }
}