/* --- 全局与基础样式 --- */
:root {
    --primary-color: #4a69bd; /* 主题蓝 */
    --secondary-color: #6a89cc;
    --success-color: #4caf50; /* 绿色 */
    --danger-color: #f44336;  /* 红色 */
    --warning-color: #ff9800; /* 橙色 */
    --light-gray: #f8f9fa;    /* 更亮的背景灰 */
    --medium-gray: #e9ecef;
    --border-color: #dee2e6; /* 统一边框颜色 */
    --dark-gray: #6c757d;
    --text-color: #343a40;
    --card-bg: #ffffff;
    --card-shadow: 0 2px 5px rgba(0, 0, 0, 0.04); /* 更柔和的阴影 */
    --border-radius: 6px; /* 稍小的圆角 */
    --font-family: 'Microsoft YaHei', 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
}

body {
    font-family: var(--font-family);
    margin: 0;
    background-color: var(--light-gray);
    color: var(--text-color);
    line-height: 1.6;
    font-size: 14px;
}

h1, h2, h3, h4 {
    margin-top: 0;
    margin-bottom: 0.7em; /* 统一减小标题下边距 */
    font-weight: 600;
}
h1 { font-size: 1.7em; color: #fff; }
h2 { font-size: 1.15em; color: #495057; display: flex; align-items: center; } /* Section titles */
h3 { font-size: 1.05em; color: var(--primary-color); border-bottom: 1px solid var(--border-color); padding-bottom: 8px; margin-bottom: 15px;}
h4 { font-size: 1em; color: var(--dark-gray); margin-bottom: 10px; }

a {
    color: var(--primary-color);
    text-decoration: none;
    transition: color 0.3s ease;
}
a:hover {
    color: var(--secondary-color);
}

i {
    margin-right: 8px; /* 稍微增大图标间距 */
    color: var(--dark-gray); /* 默认图标颜色 */
}
h2 i {
    color: var(--primary-color); /* Section title icons color */
    font-size: 1.1em;
}

/* --- 卡片样式 --- */
.card {
    background-color: var(--card-bg);
    border-radius: var(--border-radius);
    box-shadow: var(--card-shadow);
    padding: 20px;
    border: 1px solid var(--border-color); /* 添加细边框 */
}

/* --- 按钮样式 --- */
.btn {
    display: inline-block;
    padding: 8px 16px; /* 调整按钮内边距 */
    font-size: 14px;
    font-weight: 500;
    text-align: center;
    border: 1px solid transparent; /* Add border for consistency */
    border-radius: 5px;
    cursor: pointer;
    transition: background-color 0.2s ease, border-color 0.2s ease, color 0.2s ease, box-shadow 0.2s ease;
    color: #fff;
    line-height: 1.5;
}
.btn i {
    margin-right: 5px;
    color: inherit; /* Icon color inherits from button */
}

.btn-primary { background-color: var(--primary-color); border-color: var(--primary-color); }
.btn-primary:hover { background-color: var(--secondary-color); border-color: var(--secondary-color); box-shadow: 0 2px 4px rgba(0,0,0,0.1); }

.btn-secondary { background-color: #fff; color: #555; border-color: #ccc; }
.btn-secondary:hover { background-color: #f8f8f8; border-color: #bbb; }
.btn-secondary.active { background-color: var(--primary-color); color: #fff; border-color: var(--primary-color); }

.btn-success { background-color: var(--success-color); border-color: var(--success-color); }
.btn-success:hover { background-color: #45a049; border-color: #45a049; }

.btn-danger { background-color: var(--danger-color); border-color: var(--danger-color); }
.btn-danger:hover { background-color: #e53935; border-color: #e53935; }

.btn-warning { background-color: var(--warning-color); border-color: var(--warning-color); }
.btn-warning:hover { background-color: #fb8c00; border-color: #fb8c00; }


/* --- 头部 --- */
.header {
    background: var(--primary-color); /* Solid color header */
    color: #fff;
    padding: 20px 0; /* Reduced padding */
    margin-bottom: 25px;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
}
.header-content {
    max-width: 1280px; /* Adjusted max-width for tighter layout */
    margin: 0 auto;
    padding: 0 20px; /* Reduced padding */
    display: flex;
    align-items: center;
}
/* Simple icon simulation */
.simple-icon {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background-color: rgba(255, 255, 255, 0.8);
    margin-right: 15px;
    display: flex;
    align-items: center;
    justify-content: center;
}
.header-text h1 {
    margin-bottom: 3px; /* Reduced margin */
    font-weight: 600; /* Slightly lighter */
    font-size: 1.6em;
}
.header-text p {
    margin: 0;
    font-size: 0.95em; /* Slightly smaller subtext */
    opacity: 0.85;
}

/* --- 主体布局 (新两栏) --- */
.new-layout-container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 20px;
    display: grid; /* 使用 Grid 布局 */
    grid-template-columns: 320px 1fr; /* 左侧固定宽度，右侧自适应 */
    gap: 20px; /* 增加栏间距 */
    align-items: flex-start;
}

.left-panel, .right-panel {
    display: flex;
    flex-direction: column;
    gap: 15px; /* 面板内卡片间距 */
}

/* 移除旧的 sidebar 和 main-content 样式 */
/* .sidebar { ... } */
/* .right-sidebar { ... } */
/* .main-content { ... } */

/* --- 左侧面板样式 --- */
.left-panel .card {
    padding: 18px; /* 统一内边距 */
}

/* --- 右侧面板样式 --- */
.right-panel .card {
    padding: 18px;
}

/* 初始上传提示区样式调整 */
.upload-info-section {
    text-align: center;
    padding: 30px 15px !important; /* 增加内边距 */
    border-style: dashed; /* 虚线边框 */
    background-color: var(--light-gray);
}
.upload-info-section h2 {
    margin-bottom: 15px;
}

/* --- 左侧边栏：上传与全局 (旧样式移除) --- */
/* .left-sidebar .card { ... } */
.upload-info-section h2, .global-settings h2 {
    margin-bottom: 10px;
}
.supported-formats {
    font-size: 0.9em;
    color: var(--dark-gray);
    margin-bottom: 15px; /* Increased margin */
}
/* Style for the new upload button */
.upload-button {
    width: 100%;
    margin-bottom: 10px;
}
.upload-hint {
    font-size: 0.9em;
    color: var(--dark-gray);
    text-align: center;
    margin-top: 5px;
    padding: 8px;
    /* background-color: #f0f5ff; */ /* Remove background */
    border-radius: 4px;
}
.setting-hint { /* General hint styling */
    font-size: 0.9em;
    color: var(--dark-gray);
    margin-top: 8px;
    margin-bottom: 0;
    line-height: 1.4;
}
.setting-hint i {
    font-style: normal; /* Remove italics if not needed */
}

.global-opacity-group label {
    flex-basis: 100px !important;
    font-size: 0.95em; /* Match other labels */
}
.global-opacity-group span {
    min-width: 45px !important;
    text-align: right;
    font-size: 0.95em; /* Match other labels */
}

/* --- 中间内容：参数控制 (旧样式移除) --- */
/* .main-content.card { ... } */
/* .main-content h2 { ... } */

/* 新的 controls-card 样式 */
.controls-card {
    /* 可根据需要添加特定样式 */
}
.control-section {
    margin-bottom: 20px;
    padding-bottom: 15px;
    border-bottom: 1px solid var(--border-color);
}
.control-section:last-child {
    border-bottom: none;
    padding-bottom: 0;
    margin-bottom: 0;
}
.control-section h3 {
    padding-bottom: 6px;
    margin-bottom: 12px;
    display: flex; /* Align icon with text */
    align-items: center;
}
.control-section h3 i {
     color: var(--primary-color); /* Icon color for section titles */
     font-size: 1.1em;
}


/* 透明模式 Tabs */
.tabs {
    display: flex;
    margin-bottom: 15px;
    border-bottom: 1px solid var(--border-color);
}
.tab-button {
    padding: 8px 12px;
    border: none;
    background-color: transparent;
    cursor: pointer;
    font-size: 0.95em;
    color: var(--dark-gray);
    border-bottom: 2px solid transparent;
    transition: color 0.2s ease, border-color 0.2s ease;
    margin-bottom: -1px;
}
.tab-button:hover {
    color: var(--primary-color);
}
.tab-button.active {
    color: var(--primary-color);
    border-bottom-color: var(--primary-color);
    font-weight: 500;
}

/* 通用控件组 */
.control-group {
    margin-bottom: 10px; /* Slightly reduced margin */
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 8px;
}
.control-group label {
    flex-basis: 110px; /* Keep label width consistent */
    flex-shrink: 0;
    font-weight: 500;
    color: #555;
    text-align: right;
    padding-right: 8px;
    font-size: 0.95em;
}
/* Adjust label width for opacity control specifically */
.opacity-control label {
    flex-basis: 150px; /* Wider label for opacity */
}

.control-group input[type="number"],
.control-group input[type="range"],
.control-group select {
    padding: 5px 8px;
    border: 1px solid #ced4da; /* Slightly darker border */
    border-radius: 4px;
    font-size: 0.95em;
    flex-grow: 1;
    min-width: 50px;
    box-sizing: border-box; /* Ensure padding is included in width */
}
.control-group input[type="range"] {
    padding: 0;
    cursor: pointer;
    vertical-align: middle;
}
.control-group span { /* For opacity value display */
    font-weight: 500;
    min-width: 40px;
    text-align: right;
    font-size: 0.95em;
}
.control-group input[type="radio"] {
    margin-right: 4px;
    vertical-align: middle;
}
.control-group input[type="radio"] + label {
    flex-basis: auto;
    text-align: left;
    font-weight: normal;
    margin-right: 15px;
    padding-right: 0;
    font-size: 0.95em;
    vertical-align: middle;
}
.scope-control > div { /* Wrapper for radio buttons */
    display: flex;
    align-items: center;
}

/* Specific control adjustments */
.opacity-control {
    align-items: center;
}
.opacity-control input[type="number"] {
    flex-basis: 55px; /* Slightly smaller number input */
    flex-grow: 0;
    text-align: center;
}
.opacity-slider-control {
    flex-grow: 1;
}

.mode-options {
    margin-top: 10px;
    padding: 10px 12px;
    background-color: #fdfdff;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    margin-left: 0;
}
.mode-options label {
    flex-basis: 80px;
}
.mode-options input[type="number"] {
    flex-basis: 70px;
    flex-grow: 0;
}
.mode-options br { display: none; }
.mode-options .setting-hint { margin-top: 8px; margin-bottom: 0; }


.selection-control .setting-hint {
    margin-top: 8px;
    text-align: center;
    width: 100%;
}
/* Style for the restored selection inputs container */
#selectionInputs {
    margin-top: 10px;
    padding-top: 10px;
    border-top: 1px dashed var(--border-color); /* Add separator */
}
/* Ensure labels and inputs align well within selectionInputs */
#selectionInputs .control-group label {
     flex-basis: 80px; /* Shorter labels for coordinates */
}
#selectionInputs .control-group input[type="number"] {
    flex-basis: 80px; /* Fixed width for coordinate inputs */
    flex-grow: 0;
}


/* --- 右侧边栏：实时预览 (旧样式移除) --- */
/* .right-sidebar .card { ... } */

/* 预览区域样式调整 */
.preview-section {
    /* 可根据需要添加特定样式 */
}
.preview-section h2 {
    margin-bottom: 10px;
}
.preview-controls {
    margin-bottom: 12px;
    text-align: center;
}
.preview-controls .btn {
    margin: 0 4px;
    padding: 5px 10px;
    font-size: 0.9em;
}

.canvas-container-wrapper {
    width: 100%;
    margin-bottom: 15px;
    display: flex;
    justify-content: center;
    align-items: center;
    background-color: var(--medium-gray);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    min-height: 250px;
    position: relative;
    overflow: hidden;
    /* Remove cursor pointer from wrapper */
    /* cursor: pointer; */
}

/* Background patterns */
.canvas-container-wrapper.checkerboard {
    background-image: linear-gradient(45deg, #ccc 25%, transparent 25%), linear-gradient(-45deg, #ccc 25%, transparent 25%), linear-gradient(45deg, transparent 75%, #ccc 75%), linear-gradient(-45deg, transparent 75%, #ccc 75%);
    background-size: 16px 16px;
    background-position: 0 0, 0 8px, 8px -8px, -8px 0px;
}
.canvas-container-wrapper.white { background-color: #fff; }
.canvas-container-wrapper.black { background-color: #333; }


.canvas-container {
    position: relative;
    max-width: 100%;
    max-height: 450px;
    overflow: auto;
    display: inline-block;
    line-height: 0;
}

#canvas {
    display: block;
    max-width: 100%;
    height: auto;
    /* Default cursor, changed by JS based on mode */
    cursor: default;
    background-color: transparent;
}

/* Placeholder removed from HTML */
/* .placeholder-text { ... } */


.selection-box {
    position: absolute;
    border: 1px dashed var(--primary-color);
    pointer-events: none;
    display: none;
    box-sizing: border-box;
    background-color: rgba(74, 105, 189, 0.08);
}

/* 操作按钮区域样式调整 */
.action-buttons-section {
    padding: 15px !important; /* 调整内边距 */
}
.action-buttons {
    display: grid; /* 使用 Grid 布局按钮 */
    grid-template-columns: repeat(auto-fit, minmax(100px, 1fr)); /* 自动适应列数 */
    gap: 10px; /* 按钮间距 */
    margin-bottom: 10px; /* 与下方提示文字间距 */
    align-items: stretch; /* 使按钮在交叉轴上拉伸以填充高度 */
}
.action-buttons .btn {
    /* flex: 1; */ /* 移除 flex: 1 */
    padding: 0 12px; /* 移除垂直内边距，由 height 和 flex 控制 */
    height: 38px; /* 设置明确的高度 */
    box-sizing: border-box; /* 确保 padding 不影响高度 */
    display: inline-flex; /* 使用 flex 布局 */
    align-items: center; /* 垂直居中 */
    justify-content: center; /* 水平居中 */
    line-height: 1; /* 防止 line-height 影响对齐 */
}
.action-buttons-section .upload-hint {
    text-align: center;
    margin-top: 0; /* 移除上方间距 */
    padding: 0;
}

/* --- 页脚移除 --- */
.footer { display: none; }

/* --- 响应式设计 --- */
/* --- 响应式设计调整 --- */
@media (max-width: 1200px) {
    .new-layout-container {
        grid-template-columns: 1fr; /* 堆叠布局 */
        gap: 15px;
        padding: 0 15px;
    }
    /* 移除旧的响应式 sidebar/main-content 调整 */
    /* .sidebar, .main-content { ... } */
    /* .right-sidebar { ... } */
}

@media (max-width: 768px) {
    body { font-size: 13px; }
    .header { padding: 15px 0; }
    .header-content { padding: 0 15px; }
    .simple-icon { width: 35px; height: 35px; }
    .header-text h1 { font-size: 1.4em; }
    .header-text p { font-size: 0.9em; }

    .card { padding: 15px; }

    .control-group { flex-direction: column; align-items: stretch; gap: 5px; }
    .control-group label { text-align: left; margin-bottom: 3px; flex-basis: auto; }
    .control-group input[type="number"],
    .control-group input[type="range"],
    .control-group select { width: 100%; box-sizing: border-box; }
    .opacity-control { flex-direction: row; align-items: center; gap: 10px; }
    .opacity-control label { flex-basis: auto; } /* Reset basis for stacking */
    .opacity-control input[type="number"] { width: 60px; }
    .mode-options { padding: 10px; }
    .mode-options .control-group { flex-direction: row; align-items: center; }
    .mode-options label { flex-basis: 60px; }
    .mode-options input[type="number"] { width: auto; flex-grow: 1; }
    .scope-control { flex-direction: row; align-items: center; }
    .scope-control label { flex-basis: auto; margin-bottom: 0; }
    #selectionInputs .control-group { flex-direction: row; align-items: center; }
    #selectionInputs .control-group label { flex-basis: 80px; }
    #selectionInputs .control-group input[type="number"] { width: auto; flex-grow: 1; }


    .action-buttons { flex-wrap: wrap; }
    .action-buttons .btn { flex-basis: calc(50% - 4px); }

    .tabs { flex-wrap: wrap; }
    .tab-button { flex-grow: 1; text-align: center; }
}

@media (max-width: 480px) {
    .header { padding: 12px 0; }
    .simple-icon { width: 30px; height: 30px; margin-right: 10px; }
    .header-text h1 { font-size: 1.3em; }
    .header-text p { display: none; }

    .card { padding: 12px; }
    .btn { padding: 7px 10px; font-size: 13px; }
    .preview-controls .btn { padding: 4px 8px; }
    .action-buttons .btn { flex-basis: 100%; }
    .canvas-container-wrapper { min-height: 200px; }
    #selectionInputs .control-group { flex-direction: column; align-items: stretch; }
    #selectionInputs .control-group label { text-align: left; margin-bottom: 3px; }
    #selectionInputs .control-group input[type="number"] { width: 100%; }
    .opacity-control label { flex-basis: auto; } /* Ensure label stacks */
}