:root {
    --color-bg-main: #f0f4f8;
    --color-bg-panel: #ffffff;
    --color-text-main: #333333;
    --color-text-muted: #888888;
    --color-border: #dcdfe6;
    --color-accent: #ff6b6b;
    --color-accent-hover: #ff4757;
    --color-active: #4ab0d9;
    --color-danger: #ff4757;
    --shadow-panel: 0 4px 16px rgba(0, 0, 0, 0.08);
}

html { overflow-x: hidden; }

body {
    margin: 0; padding: 0;
    background-color: var(--color-bg-main);
    color: var(--color-text-main);
    font-family: 'M PLUS Rounded 1c', sans-serif;
    display: flex; height: 100vh; height: 100dvh;
    overflow: hidden; overflow-x: hidden; width: 100vw;
}

.is-hidden {
    display: none !important;
}

.toolbar {
    width: 64px; background-color: var(--color-bg-panel); border-right: 1px solid var(--color-border);
    display: flex; flex-direction: column; align-items: center; padding: 16px 0; box-shadow: var(--shadow-panel); z-index: 100;
}
.toolbar-group { display: flex; flex-direction: column; align-items: center; width: 100%; margin-bottom: 16px; }
.toolbar-group.end { margin-top: auto; margin-bottom: 0; }
.tool-btn {
    background: none; border: none; cursor: pointer; padding: 12px; border-radius: 12px;
    margin-bottom: 8px; transition: all 0.2s; color: var(--color-text-main); font-weight: bold;
}
.tool-btn svg { fill: currentColor; }
.tool-btn:hover { background-color: var(--color-bg-main); color: var(--color-accent); transform: scale(1.05); }
.tool-btn.active { background-color: var(--color-accent); color: var(--color-bg-panel); box-shadow: 0 2px 8px rgba(0,0,0,0.15); }

/* Workspace & Canvas */
.workspace { flex: 1; display: flex; position: relative; overflow: hidden; }
.main-area { flex: 1; display: flex; flex-direction: column; position: relative; }
.preview-viewport {
    flex: 1; width: 100%; overflow: hidden; position: relative; cursor: grab;
    background-image: 
        linear-gradient(45deg, var(--color-border) 25%, transparent 25%), 
        linear-gradient(-45deg, var(--color-border) 25%, transparent 25%), 
        linear-gradient(45deg, transparent 75%, var(--color-border) 75%), 
        linear-gradient(-45deg, transparent 75%, var(--color-border) 75%);
    background-size: 20px 20px;
    background-position: 0 0, 0 10px, 10px -10px, -10px 0px;
}
.preview-viewport:active { cursor: grabbing; }

.drop-zone {
    position: absolute; inset: 20px; border: 3px dashed var(--color-active); border-radius: 20px;
    display: flex; flex-direction: column; justify-content: center; align-items: center;
    background: rgba(255, 255, 255, 0.8); z-index: 10; transition: all 0.2s;
}
.drop-zone p { font-size: 18px; font-weight: bold; color: var(--color-text-muted); margin: 16px 0; }
.drop-zone.drag-over { background: rgba(74, 176, 217, 0.1); border-color: var(--color-accent); }
.upload-btn { background: var(--color-active); color: white; border: none; padding: 12px 24px; border-radius: 8px; font-weight: bold; font-size: 16px; cursor: pointer; transition: 0.2s; }
.upload-btn:hover { background: var(--color-accent); transform: translateY(-2px); }

.canvas-container { position: absolute; transform-origin: 0 0; }
#main-canvas { display: none; image-rendering: pixelated; box-shadow: 0 4px 12px rgba(0,0,0,0.3); }
#main-canvas.is-active { display: block; }

/* Zoom Controls */
.zoom-controls { display: flex; align-items: center; gap: 12px; padding: 12px 20px; background: var(--color-bg-panel); border-top: 1px solid var(--color-border); z-index: 10; }
.custom-slider { -webkit-appearance: none; width: 100%; height: 8px; background: var(--color-border); border-radius: 4px; outline: none; }
.custom-slider::-webkit-slider-thumb { -webkit-appearance: none; width: 16px; height: 16px; border-radius: 50%; background: var(--color-accent); border: 2px solid var(--color-bg-panel); cursor: pointer; }
#zoom-value { font-size: 14px; font-weight: bold; color: var(--color-accent); min-width: 48px; text-align: right; }

/* Control Panel */
.sidebar-panel {
    position: absolute; top: 0; left: 0; bottom: 0; width: 50%; max-width: 400px;
    background: rgba(255, 255, 255, 0.95); box-shadow: var(--shadow-panel); z-index: 50;
    transform: translateX(-100%); transition: transform 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
    display: flex; flex-direction: column; backdrop-filter: blur(4px);
}
.sidebar-panel.is-open { transform: translateX(0); }
.panel-header { display: flex; justify-content: space-between; align-items: center; padding: 16px 20px; border-bottom: 2px solid var(--color-border); }
.panel-header h2 { margin: 0; font-size: 16px; color: var(--color-text-main); }
.close-btn { background: none; border: none; font-size: 24px; cursor: pointer; color: var(--color-text-muted); }
.panel-content { flex: 1; overflow-y: auto; padding: 20px; display: flex; flex-direction: column; gap: 24px; -webkit-overflow-scrolling: touch; touch-action: pan-y; overscroll-behavior: contain; }
.param-section h3 { margin: 0 0 12px 0; font-size: 14px; color: var(--color-active); border-left: 4px solid var(--color-active); padding-left: 8px; }
.control-group { margin-bottom: 16px; }
.slider-header { display: flex; align-items: center; font-size: 13px; font-weight: bold; margin-bottom: 8px; }
.val-display { margin-left: auto; color: var(--color-accent); font-family: monospace; }
.check-label { display: flex; align-items: center; gap: 8px; font-size: 13px; font-weight: bold; cursor: pointer; margin-bottom: 16px; }

/* New Additions for ASCII TONE inputs */
.custom-select { width: 100%; padding: 8px; border-radius: 4px; border: 1px solid var(--color-border); font-family: inherit; font-size: 13px; outline: none; background: #fff; cursor: pointer; }
.color-picker { -webkit-appearance: none; border: none; width: 100%; height: 32px; border-radius: 4px; cursor: pointer; padding: 0; }
.color-picker::-webkit-color-swatch-wrapper { padding: 0; }
.color-picker::-webkit-color-swatch { border: 1px solid var(--color-border); border-radius: 4px; }

/* Tooltips */
.info-btn { background: var(--color-border); color: var(--color-text-main); border: none; border-radius: 50%; width: 16px; height: 16px; font-size: 10px; font-weight: bold; margin-left: 8px; cursor: help; display: inline-flex; justify-content: center; align-items: center; }
.info-popup { position: fixed; background: rgba(0,0,0,0.85); color: #fff; padding: 8px 12px; border-radius: 6px; font-size: 12px; width: max-content; max-width: 250px; z-index: 2000; box-shadow: 0 4px 8px rgba(0,0,0,0.3); line-height: 1.4; pointer-events: none; opacity: 1; transition: opacity 0.2s; }

/* Modals */
.boot-blocker { position: fixed; inset: 0; background: rgba(255,255,255,0.8); z-index: 9999; display: flex; flex-direction: column; justify-content: center; align-items: center; transition: opacity 0.3s; }
.boot-spinner { width: 40px; height: 40px; border: 4px solid var(--color-border); border-top-color: var(--color-accent); border-radius: 50%; animation: spin 1s linear infinite; margin-bottom: 16px; }
@keyframes spin { 100% { transform: rotate(360deg); } }
.modal-overlay { position: fixed; inset: 0; background: rgba(0,0,0,0.5); z-index: 10000; display: flex; justify-content: center; align-items: center; }
.modal-content { background: var(--color-bg-panel); padding: 24px; border-radius: 16px; width: 90%; max-width: 500px; max-height: 85vh; overflow-y: auto; border: 1px solid var(--color-border); box-shadow: 0 10px 30px rgba(0,0,0,0.2); box-sizing: border-box; margin: 0 16px; }
.modal-header { display: flex; justify-content: space-between; align-items: center; border-bottom: 1px solid var(--color-border); padding-bottom: 12px; margin-bottom: 16px; }
.modal-header h3 { margin: 0; font-size: 18px; color: var(--color-text-main); }
.info-section { margin-bottom: 20px; }
.info-section:last-child { margin-bottom: 0; }
.info-heading { margin: 0 0 8px 0; font-size: 14px; color: var(--color-active); border-left: 4px solid var(--color-active); padding-left: 8px; }
.info-section p { font-size: 13px; line-height: 1.6; margin: 0; color: var(--color-text-main); }

/* D-pad Mobile */
.dpad-container { display: none; position: absolute; bottom: 16px; left: 16px; width: 100px; height: 100px; z-index: 20; }
.dpad-btn { position: absolute; width: 32px; height: 32px; background: rgba(255,255,255,0.9); border: 1px solid var(--color-border); border-radius: 8px; display: flex; justify-content: center; align-items: center; box-shadow: 0 2px 4px rgba(0,0,0,0.2); user-select: none; }
.dpad-btn:active { background: var(--color-accent); color: white; }
.dpad-up { top: 0; left: 34px; } .dpad-down { bottom: 0; left: 34px; } .dpad-left { top: 34px; left: 0; } .dpad-right { top: 34px; right: 0; }

/* Compare Mode */
#original-canvas {
    position: absolute;
    top: 0;
    left: 0;
    display: none;
    clip-path: inset(0 0 0 var(--compare-pos, 50%));
    box-shadow: 0 4px 12px rgba(0,0,0,0.3);
}
#original-canvas.is-active {
    display: block;
}

.compare-handle {
    position: absolute;
    width: 3px;
    background-color: var(--color-accent);
    cursor: ew-resize;
    z-index: 15;
    transform: translateX(-50%);
}
.compare-thumb {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 36px;
    height: 36px;
    background-color: var(--color-accent);
    border: 3px solid #fff;
    border-radius: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
    color: #fff;
    box-shadow: 0 2px 8px rgba(0,0,0,0.3);
    transition: transform 0.1s;
}
.compare-handle:hover .compare-thumb {
    transform: translate(-50%, -50%) scale(1.1);
}

/* Tutorial Animations */
@keyframes pulse-ring { 0% { box-shadow: 0 0 0 0 rgba(255, 107, 107, 0.7); } 70% { box-shadow: 0 0 0 12px rgba(255, 107, 107, 0); } 100% { box-shadow: 0 0 0 0 rgba(255, 107, 107, 0); } }
.tutorial-highlight { animation: pulse-ring 1.5s infinite; background-color: var(--color-bg-main); color: var(--color-accent); }
.tutorial-tooltip { position: absolute; top: 60px; left: 12px; background: var(--color-accent); color: #fff; padding: 10px 14px; border-radius: 8px; font-size: 13px; font-weight: bold; white-space: nowrap; box-shadow: 0 6px 16px rgba(0,0,0,0.2); opacity: 0; transform: translateY(-10px); transition: all 0.4s cubic-bezier(0.25, 0.8, 0.25, 1); pointer-events: none; z-index: 2000; display: flex; align-items: center; gap: 8px; }
.tutorial-tooltip::before { content: ''; position: absolute; top: -6px; left: 20px; border-width: 0 6px 6px 6px; border-style: solid; border-color: transparent transparent var(--color-accent) transparent; }
.tutorial-tooltip.is-visible { opacity: 1; transform: translateY(0); pointer-events: auto; }
.tutorial-close { background: none; border: none; color: #fff; font-size: 18px; cursor: pointer; padding: 0; line-height: 1; opacity: 0.8; }
.tutorial-close:hover { opacity: 1; }

/* Responsive */
@media screen and (max-width: 768px) {
    body { flex-direction: column; }
    .toolbar { width: 100%; height: auto; flex-direction: row; padding: 8px; border-right: none; border-bottom: 1px solid var(--color-border); box-sizing: border-box; }
    .toolbar-group { flex-direction: row; margin-bottom: 0; width: auto; }
    .toolbar-group.end { margin-left: auto; }
    .tool-btn { margin: 0 4px; padding: 8px; }
    .zoom-controls { order: -1; border-top: none; border-bottom: 1px solid var(--color-border); }
    .info-popup { left: 50% !important; transform: translateX(-50%) !important; top: auto !important; bottom: 80px !important; width: 90% !important; max-width: none !important; box-sizing: border-box; text-align: center; }
    .sidebar-panel { top: auto; left: 0; bottom: 0; width: 100%; max-width: none; height: 60vh; transform: translateY(100%); border-radius: 16px 16px 0 0; }
    .sidebar-panel.is-open { transform: translateY(0); }
    .dpad-container { display: block; }
    .tutorial-tooltip { top: 60px; left: 8px; }
}