:root {
    --color-bg-main: #aeb1ba;
    --color-bg-panel: #5f616d;
    --color-text-main: #ffffff;
    --color-border: #3d3e46;
    --color-btn-yellow: #f8c933;
    --color-btn-red: #cd292a;
    --color-btn-blue: #0040a0;
    --color-btn-green: #006a3a;
    --shadow-panel: 0 4px 16px rgba(0, 0, 0, 0.5);
    --shadow-btn: inset -2px -2px 6px rgba(0,0,0,0.3), inset 2px 2px 6px rgba(255,255,255,0.5), 0 4px 6px rgba(0,0,0,0.4);
    --shadow-btn-active: inset 2px 2px 6px rgba(0,0,0,0.5), inset -2px -2px 6px rgba(255,255,255,0.2), 0 1px 2px rgba(0,0,0,0.4);
}

html, 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; width: 100vw;
    overflow: hidden;
}

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

.toolbar {
    width: 72px; background-color: var(--color-bg-panel); 
    border-right: 2px solid var(--color-border); display: flex; flex-direction: column; align-items: center; padding: 16px 0; z-index: 100;
}
.toolbar-group { display: flex; flex-direction: column; align-items: center; width: 100%; gap: 12px;}
.toolbar-group.end { margin-top: auto; }

.tool-btn {
    border: none; cursor: pointer; border-radius: 50%;
    width: 48px; height: 48px; display: flex; justify-content: center; align-items: center;
    box-shadow: var(--shadow-btn); transition: transform 0.1s, box-shadow 0.1s;
}
.tool-btn:active, .tool-btn.active {
    box-shadow: var(--shadow-btn-active); transform: translateY(2px);
}
.btn-yellow { background-color: var(--color-btn-yellow); }
.btn-red { background-color: var(--color-btn-red); }
.btn-blue { background-color: var(--color-btn-blue); }
.btn-green { background-color: var(--color-btn-green); }

.lang-text { font-weight: bold; color: #fff; font-size: 14px; }

.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;
    background-color: #222;
}

.drop-zone {
    position: absolute; inset: 20px; border: 3px dashed var(--color-btn-yellow); border-radius: 20px;
    display: flex; flex-direction: column; justify-content: center; align-items: center;
    background: rgba(0, 0, 0, 0.6); z-index: 10;
}
.upload-btn { 
    background: var(--color-btn-blue); color: white; padding: 12px 24px; border-radius: 24px; font-weight: bold; cursor: pointer; border: none; box-shadow: var(--shadow-btn); margin-top: 16px;
}
.upload-btn:active { box-shadow: var(--shadow-btn-active); transform: translateY(2px); }

.canvas-container { position: absolute; transform-origin: 0 0; }
#main-canvas { display: none; image-rendering: pixelated; box-shadow: 0 0 20px rgba(0,0,0,1); }
#main-canvas.is-active { display: block; }

.sidebar-panel {
    position: absolute; top: 0; left: 0; bottom: 0; width: 350px;
    background: rgba(95, 97, 109, 0.95); box-shadow: var(--shadow-panel); z-index: 50;
    transform: translateX(-100%); transition: transform 0.3s;
    display: flex; flex-direction: column; border-right: 2px solid var(--color-border);
}
.sidebar-panel.is-open { transform: translateX(0); }
.panel-header { display: flex; justify-content: space-between; align-items: center; padding: 16px; border-bottom: 2px solid var(--color-border); }
.panel-header h2 { margin: 0; font-size: 16px; text-shadow: 1px 1px 2px #000; }
.close-btn { background: none; border: none; font-size: 24px; color: #fff; cursor: pointer; }
.panel-content { padding: 20px; overflow-y: auto; flex: 1; }
.param-section h3 { font-size: 14px; color: var(--color-btn-yellow); border-bottom: 1px solid var(--color-border); padding-bottom: 4px; text-shadow: 1px 1px 2px #000; }
.control-group { margin-bottom: 16px; }
.slider-header { display: block; font-size: 13px; font-weight: bold; margin-bottom: 8px; text-shadow: 1px 1px 2px #000; }
.text-input {
    width: 100%; padding: 8px; border-radius: 4px; border: 1px solid var(--color-border);
    background: #3d3e46; color: #fff; font-family: inherit; font-size: 14px; outline: none; box-sizing: border-box;
}

.zoom-controls { 
    display: flex; align-items: center; gap: 12px; padding: 12px; background: var(--color-bg-panel); border-top: 2px solid var(--color-border); text-shadow: 1px 1px 2px #000;
}
.custom-slider { width: 100%; cursor: pointer; }
#zoom-value { min-width: 48px; text-align: right; font-weight: bold; }

.zoom-controls span {
    white-space: nowrap;
}

#bounding-box {
    position: absolute; box-sizing: border-box; border: 1px dashed #000; z-index: 10; pointer-events: none;
}
#bounding-box::after {
    content: ""; position: absolute; top: -1px; left: -1px; right: -1px; bottom: -1px; border: 1px dashed #fff; pointer-events: none;
}
.resize-handle {
    position: absolute; width: 8px; height: 8px; background-color: #fff; border: 1px solid #000; box-sizing: border-box; pointer-events: none; z-index: 11;
}
.resize-handle[data-dir="0"] { top: -4px; left: -4px; }
.resize-handle[data-dir="1"] { top: -4px; left: calc(50% - 4px); }
.resize-handle[data-dir="2"] { top: -4px; right: -4px; }
.resize-handle[data-dir="3"] { top: calc(50% - 4px); right: -4px; }
.resize-handle[data-dir="4"] { bottom: -4px; right: -4px; }
.resize-handle[data-dir="5"] { bottom: -4px; left: calc(50% - 4px); }
.resize-handle[data-dir="6"] { bottom: -4px; left: -4px; }
.resize-handle[data-dir="7"] { top: calc(50% - 4px); left: -4px; }

.modal-overlay { position: fixed; inset: 0; background: rgba(0,0,0,0.6); display: flex; justify-content: center; align-items: center; }
.modal-content { background: var(--color-bg-panel); padding: 24px; border-radius: 12px; width: 90%; max-width: 400px; border: 2px solid var(--color-border); box-shadow: var(--shadow-panel); box-sizing: border-box; color: #fff;}
.modal-header { display: flex; justify-content: space-between; align-items: center; border-bottom: 2px solid var(--color-border); padding-bottom: 12px; margin-bottom: 16px; }
.modal-header h3 { margin: 0; font-size: 18px; text-shadow: 1px 1px 2px #000;}
.info-heading { margin: 0 0 8px 0; font-size: 14px; color: var(--color-btn-yellow); border-left: 4px solid var(--color-btn-yellow); padding-left: 8px; }
.info-section p { font-size: 13px; line-height: 1.6; margin: 0;}

@media screen and (max-width: 768px) {
    body { flex-direction: column; }
    
    .toolbar { 
        width: 100%; 
        height: auto; 
        flex-direction: row; 
        padding: 8px 12px; 
        border-right: none; 
        border-bottom: 2px solid var(--color-border); 
        box-sizing: border-box; 
    }
    .toolbar-group { 
        flex-direction: row; 
        margin-bottom: 0; 
        width: auto; 
        gap: 8px;
    }
    .toolbar-group.end { 
        margin-top: 0;
        margin-left: auto; 
    }
    
    .tool-btn { 
        width: 40px; 
        height: 40px; 
        padding: 6px;
    }
    .tool-btn svg {
        width: 20px;
        height: 20px;
    }
    .lang-text {
        font-size: 12px;
    }
    
    .zoom-controls { 
        order: -1; 
        border-top: none; 
        border-bottom: 2px solid var(--color-border); 
    }
    
    .sidebar-panel { 
        top: auto; 
        left: 0; 
        bottom: 0; 
        width: 100%; 
        max-width: none; 
        height: 55vh;
        transform: translateY(100%); 
        border-right: none;
        border-top: 2px solid var(--color-border);
        border-radius: 16px 16px 0 0; 
    }
    .sidebar-panel.is-open { 
        transform: translateY(0); 
    }
    
    .modal-content {
        max-height: 80vh;
        overflow-y: auto;
    }
}