/**
 * base.css - 基础样式
 * 包含：CSS重置、CSS变量、排版基础
 */

/* ===== CSS Reset ===== */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    font-size: 14px;
    -webkit-text-size-adjust: 100%;
}

body {
    font-family: var(--tool-font);
    color: var(--tool-text);
    background: var(--tool-bg);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

a {
    color: var(--tool-primary);
    text-decoration: none;
    transition: color 0.2s;
}
a:hover {
    color: var(--tool-primary-dark);
}

ul, ol {
    list-style: none;
}

img {
    max-width: 100%;
    display: block;
}

button, input, select, textarea {
    font-family: inherit;
    font-size: inherit;
    color: inherit;
}

button {
    cursor: pointer;
    border: none;
    background: none;
}

textarea {
    resize: vertical;
}

/* ===== CSS 变量 ===== */
:root {
    /* 主题色 */
    --tool-primary: #667eea;
    --tool-primary-dark: #5568d3;
    --tool-primary-light: rgba(102, 126, 234, 0.1);
    --tool-secondary: #764ba2;
    --tool-success: #67c23a;
    --tool-warning: #e6a23c;
    --tool-danger: #f56c6c;
    --tool-info: #909399;

    /* 文字色 */
    --tool-text: #333;
    --tool-text-secondary: #666;
    --tool-text-muted: #999;
    --tool-text-inverse: #fff;

    /* 边框和背景 */
    --tool-border: #e8e8e8;
    --tool-border-light: #f0f0f0;
    --tool-bg: #fff;
    --tool-bg-secondary: #f8f9fa;
    --tool-bg-tertiary: #f5f7fa;

    /* 圆角和阴影 */
    --tool-radius-sm: 4px;
    --tool-radius: 8px;
    --tool-radius-lg: 12px;
    --tool-shadow-sm: 0 1px 4px rgba(0,0,0,0.06);
    --tool-shadow: 0 2px 12px rgba(0,0,0,0.06);
    --tool-shadow-lg: 0 8px 24px rgba(0,0,0,0.1);

    /* 字体 */
    --tool-font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Microsoft YaHei", "PingFang SC", sans-serif;
    --tool-mono: Consolas, "Courier New", Monaco, monospace;

    /* 间距 */
    --tool-space-xs: 4px;
    --tool-space-sm: 8px;
    --tool-space: 16px;
    --tool-space-lg: 24px;
    --tool-space-xl: 32px;

    /* 过渡 */
    --tool-transition: all 0.2s ease;
}

/* ===== 排版 ===== */
h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    color: var(--tool-text);
    line-height: 1.4;
}

h1 { font-size: 24px; }
h2 { font-size: 20px; }
h3 { font-size: 18px; }
h4 { font-size: 16px; }
h5 { font-size: 14px; }
h6 { font-size: 12px; }

p {
    margin-bottom: var(--tool-space-sm);
}

code, pre {
    font-family: var(--tool-mono);
    font-size: 13px;
}

code {
    background: var(--tool-bg-secondary);
    padding: 2px 6px;
    border-radius: var(--tool-radius-sm);
    color: #e83e8c;
}

pre {
    background: #2d2d2d;
    color: #f8f8f2;
    padding: var(--tool-space);
    border-radius: var(--tool-radius);
    overflow-x: auto;
    line-height: 1.6;
}

/* ===== 工具类 ===== */
.tool-text-center { text-align: center; }
.tool-text-right { text-align: right; }
.tool-text-muted { color: var(--tool-text-muted); }
.tool-text-success { color: var(--tool-success); }
.tool-text-danger { color: var(--tool-danger); }
.tool-text-warning { color: var(--tool-warning); }

.tool-float-left { float: left; }
.tool-float-right { float: right; }
.tool-clearfix::after {
    content: '';
    display: table;
    clear: both;
}

.tool-hidden { display: none !important; }
.tool-invisible { visibility: hidden; }

.tool-ellipsis {
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.tool-mono {
    font-family: var(--tool-mono);
}