/* --- 基础变量 (Modern Dark - Zinc Theme, 同步自 Sprite 项目) --- */
:root {
    --primary: #6366f1;
    --primary-hover: #818cf8;
    --surface: #18181b; /* Zinc 900 */
    --background: #09090b; /* Zinc 950 */
    --border: #3f3f46; /* Zinc 700 */
    --input-bg: #27272a; /* Zinc 800 */
    --text-main: #f4f4f5; /* Zinc 100 */
    --text-sub: #a1a1aa; /* Zinc 400 */
    --success: #10b981;
    --accent: var(--primary);
}

[data-theme="light"] {
    --primary: #4f46e5;
    --primary-hover: #4338ca;
    --surface: #ffffff;
    --background: #f8fafc;
    --border: #e2e8f0;
    --input-bg: #f1f5f9;
    --text-main: #334155;
    --text-sub: #64748b;
}

* { box-sizing: border-box; outline: none; }

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

/* --- 布局样式 (同步自 Sprite) --- */
header {
    background: var(--surface); padding: 15px 30px; border-bottom: 1px solid var(--border);
    display: flex; justify-content: space-between; align-items: center; flex-shrink: 0;
}

.brand { font-size: 20px; font-weight: 800; color: var(--primary); display: flex; gap: 10px; align-items: center; }
.brand span { color: var(--text-main); }

.theme-toggle {
    background: transparent; border: 1px solid var(--border); color: var(--text-main);
    padding: 6px 10px; border-radius: 6px; cursor: pointer; display: flex; gap: 5px; 
    font-size: 12px; transition: 0.2s;
}
.theme-toggle:hover { background: var(--input-bg); border-color: var(--text-sub); }

.main-layout { display: grid; grid-template-columns: 340px 1fr; flex: 1; overflow: hidden; }

.sidebar {
    background: var(--surface); border-right: 1px solid var(--border);
    padding: 20px; overflow-y: auto; display: flex; flex-direction: column; gap: 24px;
}

.panel-section { display: flex; flex-direction: column; gap: 12px; }

.settings-card {
    background: rgba(255, 255, 255, 0.03); border: 1px solid var(--border); border-radius: 8px;
    padding: 16px; display: flex; flex-direction: column; gap: 16px;
}
[data-theme="light"] .settings-card { background: rgba(0, 0, 0, 0.02); }

.step-header {
    font-size: 13px; font-weight: 600; color: var(--text-main);
    display: flex; align-items: center; gap: 8px;
}
.step-header::before {
    content: ''; display: block; width: 4px; height: 14px;
    background: var(--primary); border-radius: 2px;
}
.step-badge { display: none; }

/* --- 组件样式 --- */
.control-group { display: flex; flex-direction: column; gap: 8px; }

label { font-size: 12px; color: var(--text-sub); font-weight: 500; }

/* --- 开关风格 (Toggle Switch) --- */
.toggle-switch { display: flex; justify-content: space-between; cursor: pointer; align-items: center; gap: 10px; }
.toggle-switch span { font-size: 12px; color: var(--text-sub); font-weight: 500; }
.toggle-track { width: 40px; height: 22px; background: var(--border); border-radius: 20px; position: relative; transition: 0.3s; flex-shrink: 0; }
.toggle-track::after { content:''; position:absolute; top:2px; left:2px; width:18px; height:18px; background:#fff; border-radius:50%; transition:0.3s; }
.toggle-switch input { display: none; }
.toggle-switch input:checked + .toggle-track { background: var(--primary); }
.toggle-switch input:checked + .toggle-track::after { transform: translateX(18px); }

input[type="number"], input[type="text"], input[type="range"] {
    width: 100%;
}

input[type="number"], input[type="text"] {
    padding: 8px 12px; border: 1px solid var(--border); border-radius: 6px;
    background: var(--input-bg); color: var(--text-main); font-size: 14px;
    transition: 0.2s;
}
input[type="number"]:focus, input[type="text"]:focus { border-color: var(--primary); box-shadow: 0 0 0 2px rgba(99, 102, 241, 0.1); }

/* --- 滑块风格 (Modern Custom Range) --- */
input[type="range"] {
    -webkit-appearance: none; appearance: none; height: 6px; background: var(--border); border-radius: 3px; outline: none; margin: 10px 0;
}
input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none; appearance: none; width: 18px; height: 18px; background: var(--primary); border-radius: 50%; cursor: pointer; transition: 0.2s; border: 2px solid var(--surface);
}
input[type="range"]::-webkit-slider-thumb:hover { transform: scale(1.1); box-shadow: 0 0 10px rgba(99, 102, 241, 0.4); }

.slider-row { display: flex; align-items: center; gap: 12px; }
.slider-row input[type="range"] { flex-grow: 1; }
.slider-row .value { min-width: 45px; font-family: monospace; font-size: 12px; color: var(--primary); font-weight: 700; text-align: right; }

.btn-primary {
    width: 100%; padding: 12px; border: none; border-radius: 8px; font-weight: 600; cursor: pointer;
    display: flex; justify-content: center; align-items: center; gap: 8px;
    background: var(--primary); color: #fff; transition: 0.2s; font-size: 14px;
}
.btn-primary:hover:not(:disabled) { background: var(--primary-hover); transform: translateY(-1px); box-shadow: 0 4px 12px rgba(99, 102, 241, 0.3); }
.btn-primary:active:not(:disabled) { transform: translateY(0); }
.btn-primary:disabled { background: var(--border); opacity: 0.5; cursor: not-allowed; }

.btn-secondary {
    width: 100%; padding: 10px; border: 1px solid var(--border); border-radius: 8px; font-weight: 500; cursor: pointer;
    display: flex; justify-content: center; align-items: center; gap: 8px;
    background: var(--surface); color: var(--text-main); transition: 0.2s; font-size: 13px;
}
.btn-secondary:hover:not(:disabled) { background: var(--input-bg); border-color: var(--text-sub); }

.btn-export {
    width: 100%; padding: 12px; border: none; border-radius: 8px; font-weight: 600; cursor: pointer;
    display: flex; justify-content: center; align-items: center; gap: 8px;
    background: #10b981; color: #fff; transition: 0.2s; font-size: 14px;
}
.btn-export:hover:not(:disabled) { background: #059669; transform: translateY(-1px); box-shadow: 0 4px 12px rgba(16, 185, 129, 0.3); }
.btn-export:disabled { background: var(--border); opacity: 0.5; cursor: not-allowed; }

/* --- 吸管工具样式 (同步自 Sprite) --- */
.color-tools { display: flex; gap: 10px; align-items: center; margin-bottom: 12px; }

.tool-btn { 
    flex: 1; display: flex; align-items: center; justify-content: center; gap: 8px; 
    background: var(--surface); border: 1px solid var(--border); padding: 8px; border-radius: 6px; 
    cursor: pointer; color: var(--text-main); transition: 0.2s; font-size: 13px; font-weight: 500; 
}
.tool-btn:hover { border-color: var(--primary); background: rgba(99, 102, 241, 0.05); }
.tool-btn.active { background: var(--primary); color: #fff; border-color: var(--primary); box-shadow: 0 4px 12px rgba(99, 102, 241, 0.3); }
.tool-btn input { display: none; }

.color-preview-box {
    width: 36px; height: 36px; border-radius: 6px; border: 2px solid #fff; 
    background: transparent; position: relative; overflow: hidden;
    transition: 0.2s; box-shadow: 0 2px 8px rgba(0,0,0,0.2);
    flex-shrink: 0;
}
.color-preview-box input[type="color"] {
    position: absolute; top: -50%; left: -50%; width: 200%; height: 200%;
    opacity: 0; cursor: pointer;
}
.color-preview-box.has-color { border-color: #fff; }

/* --- 文件上传区域 --- */
.file-drop-area {
    border: 2px dashed var(--border); border-radius: 12px; padding: 20px;
    text-align: center; cursor: pointer; background: var(--input-bg); transition: 0.2s;
    display: flex; flex-direction: column; align-items: center; justify-content: center;
    height: 140px;
}
.file-drop-area:hover { border-color: var(--primary); background: rgba(99, 102, 241, 0.05); }
.file-drop-area input[type="file"] { display: none; }

.file-icon { width: 32px; height: 32px; fill: var(--primary); margin-bottom: 8px; flex-shrink: 0; }
.file-msg { 
    font-size: 13px; color: var(--text-sub); line-height: 1.5;
    max-width: 100%; overflow: hidden; text-overflow: ellipsis;
    display: -webkit-box; -webkit-line-clamp: 3; line-clamp: 3; -webkit-box-orient: vertical;
}
.file-msg kbd {
    background: var(--surface); border: 1px solid var(--border); border-radius: 4px;
    padding: 2px 4px; font-family: monospace; font-size: 11px; color: var(--text-main);
}

/* --- 右侧视图区域 (同步自 Sprite) --- */
.main-view { 
    flex-grow: 1; position: relative; background: var(--background); overflow: hidden; 
    cursor: grab; background-image: radial-gradient(var(--border) 1px, transparent 1px); background-size: 20px 20px;
    display: flex; align-items: center; justify-content: center;
}
.main-view:active { cursor: grabbing; }

/* 确保 canvas 继承父容器的光标，除非在平移时 */
#canvas {
    cursor: inherit;
}

/* 吸色模式下的自定义鼠标样式 (同步自 Sprite) */
.main-view.picking, .main-view.picking * {
    cursor: crosshair !important; 
    cursor: url("data:image/svg+xml,%3Csvg width='24' height='24' viewBox='0 0 24 24' fill='none' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath d='M12 5V10M12 14V19M5 12H10M14 12H19' stroke='white' stroke-width='2' stroke-linecap='square'/%3E%3Cpath d='M12 5V10M12 14V19M5 12H10M14 12H19' stroke='black' stroke-width='1' stroke-linecap='square'/%3E%3C/svg%3E") 12 12, crosshair !important;
}

.empty-state {
    text-align: center; color: var(--text-sub); z-index: 1; pointer-events: none;
}
.empty-state svg { width: 64px; height: 64px; fill: var(--border); margin-bottom: 16px; transition: 0.3s; }
.main-view:hover .empty-state svg { fill: var(--primary); transform: translateY(-5px); }
.empty-state p { margin: 0; line-height: 1.6; font-size: 14px; font-weight: 500; }

/* --- 顶部中心状态信息 (无边框样式) --- */
.top-center-status {
    position: absolute;
    top: 20px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    z-index: 10;
    pointer-events: none;
}

#statusBar {
    font-size: 13px;
    font-weight: 600;
    color: var(--text-main);
    text-shadow: 0 2px 8px rgba(0,0,0,0.8);
    background: transparent;
    padding: 0;
    border-radius: 0;
    backdrop-filter: none;
    border: none;
    width: fit-content;
}

/* --- 左上角数据统计 (无边框样式) --- */
.top-left-stats {
    position: absolute;
    top: 20px;
    left: 20px;
    z-index: 10;
    pointer-events: none;
}

.poly-count {
    font-family: 'JetBrains Mono', 'Fira Code', monospace;
    font-size: 12px;
    color: var(--primary);
    font-weight: 700;
    background: transparent;
    padding: 0;
    border-radius: 0;
    border: none;
    width: fit-content;
    text-shadow: 0 2px 4px rgba(0,0,0,0.5);
}

.progress-container { 
    width: 200px; 
    height: 3px; 
    background: rgba(255,255,255,0.1); 
    border-radius: 2px; 
    overflow: hidden; 
    display: none;
    box-shadow: 0 1px 4px rgba(0,0,0,0.5);
}
.progress-bar { width: 0%; height: 100%; background: var(--primary); transition: 0.2s; box-shadow: 0 0 10px var(--primary); }

.mode-indicator {
    display: none;
}

.view-controls {
    position: absolute; top: 20px; right: 20px; display: flex; flex-direction: column; gap: 8px; z-index: 5;
}
.view-controls .toggle-switch {
    background: rgba(24, 24, 27, 0.8); padding: 8px 12px;
    border-radius: 12px; border: 1px solid var(--border); cursor: pointer; transition: 0.2s;
    backdrop-filter: blur(12px); -webkit-backdrop-filter: blur(12px);
    box-shadow: 0 4px 12px rgba(0,0,0,0.1);
}
[data-theme="light"] .view-controls .toggle-switch { background: rgba(255, 255, 255, 0.8); }
.view-controls .toggle-switch:hover { border-color: var(--primary); }

/* --- 视图工具栏 (同步自 EdgeExtender/Sprite) --- */
.view-toolbar {
    position: absolute; bottom: 20px; left: 50%; transform: translateX(-50%);
    background: rgba(24, 24, 27, 0.8); border: 1px solid var(--border); border-radius: 30px;
    padding: 4px 8px; display: flex; align-items: center; gap: 4px; z-index: 100;
    box-shadow: 0 4px 20px rgba(0,0,0,0.3); backdrop-filter: blur(12px); -webkit-backdrop-filter: blur(12px);
}
[data-theme="light"] .view-toolbar { background: rgba(255, 255, 255, 0.8); }

.view-btn {
    background: transparent; border: none; color: var(--text-main);
    width: 32px; height: 32px; border-radius: 50%;
    display: flex; justify-content: center; align-items: center;
    cursor: pointer; transition: 0.2s; opacity: 0.7;
}
.view-btn:hover { background: rgba(255,255,255,0.1); opacity: 1; }
.view-btn.active { opacity: 1; color: var(--primary); background: rgba(99, 102, 241, 0.1); }
.view-btn svg { width: 20px; height: 20px; fill: currentColor; }

/* --- 状态栏 --- */
.hidden { display: none !important; }

/* 滚动条美化 */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 10px; }
::-webkit-scrollbar-thumb:hover { background: var(--text-sub); }