/* ===================== 白底版 covertool.css ===================== */
:root {
    --card-bg: #ffffff;
    --input-bg: #f8f9fa;
    --accent: #3682e0;
    --text: #333333;
}

body {
    margin: 0;
    height: 100vh;
    display: flex;
    flex-direction: column;
    font-family: "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
    color: var(--text);
    background: #f5f7fa;        
}

/* 画布区域 */
#editor {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 40px 20px;          
}

canvas {
    background: #fff;
    border-radius: 12px;        
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.08);
    max-width: 100%;
    max-height: 100%;
}

/* 底栏控制区 */
#sidebar {
    background: var(--card-bg);
    padding: 30px 40px;
    border-top: 1px solid #e9ecef;   /* 浅灰分割线 */
    display: grid;
    grid-template-columns: 220px 1fr 1fr 200px;
    gap: 30px;
    align-items: start;
}

/* 每组样式的卡片容器 */
.group {
    display: flex;
    flex-direction: column;
    gap: 12px;
}
.group label {
    font-size: 14px;
    color: #666;
    font-weight: 600;
}

/* 输入框、下拉框通用样式 */
input[type="text"],
select {
    width: 100%;
    padding: 10px 12px;
    background: var(--input-bg);
    border: 1px solid #dee2e6;
    color: var(--text);
    border-radius: 6px;
    font-size: 14px;
    box-sizing: border-box;
    transition: border-color .2s;
}
input[type="text"]:focus,
select:focus {
    outline: none;
    border-color: var(--accent);
}

/* 颜色选择器容器 */
.color-row {
    display: flex;
    gap: 10px;
}
.color-item {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 6px;
}
.color-item input[type="text"] {
    min-width: 65px;
    border: none;
    background: transparent;
    font-family: monospace;
    font-size: 12px;
    padding: 0 4px;
}

/* 原生 color 控件 */
input[type="color"] {
    width: 100%;
    height: 36px;
    border: none;
    background: none;
    cursor: pointer;
}

/* 按钮样式 */
button {
    padding: 10px 16px;
    border-radius: 6px;
    border: none;
    font-weight: 500;
    cursor: pointer;
    transition: all .3s ease;
    font-size: 14px;
}
button[onclick="sendToWPF()"] {
    background: var(--accent);
    color: #fff;
}
button[onclick="sendToWPF()"]:hover {
    background: #2c6cb0;
}
button[onclick="uiReset()"] {
    background: #6c757d;
    color: #fff;
}
button[onclick="uiReset()"]:hover {
    background: #5a6268;
}

/* 响应式：与首页保持一致 */
@media (max-width: 992px) {
    #sidebar {
        grid-template-columns: 1fr 1fr;
        gap: 20px;
        padding: 20px;
    }
}
@media (max-width: 576px) {
    #sidebar {
        grid-template-columns: 1fr;
        padding: 20px 15px;
    }
}