/**
 * 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（扁平风格，与前台保持一致） ===== */
:root {
    /* 主色（深蓝） */
    --tool-primary: #2563eb;
    --tool-primary-dark: #1d4ed8;
    --tool-primary-light: #eff6ff;
    --tool-primary-border: #93c5fd;

    /* 功能色 */
    --tool-success: #16a34a;
    --tool-success-light: #f0fdf4;
    --tool-warning: #f59e0b;
    --tool-warning-light: #fffbeb;
    --tool-danger: #dc2626;
    --tool-danger-light: #fef2f2;
    --tool-info: #2563eb;
    --tool-info-light: #eff6ff;

    /* 中性色 */
    --tool-text: #1e293b;
    --tool-text-secondary: #475569;
    --tool-text-muted: #94a3b8;
    --tool-text-inverse: #fff;
    --tool-border: #e2e8f0;
    --tool-border-light: #f1f5f9;
    --tool-input-border: #cbd5e1;
    --tool-bg: #ffffff;
    --tool-bg-secondary: #f8fafc;
    --tool-bg-tertiary: #f1f5f9;
    --tool-bg-dark: #1e293b;

    /* 圆角（克制） */
    --tool-radius-sm: 4px;
    --tool-radius: 6px;
    --tool-radius-lg: 8px;

    /* 阴影（克制使用，边框优先） */
    --tool-shadow-sm: 0 1px 4px rgba(0,0,0,0.04);
    --tool-shadow: 0 2px 8px rgba(0,0,0,0.04);
    --tool-shadow-hover: 0 4px 12px rgba(0,0,0,0.06);
    --tool-shadow-lg: 0 8px 30px rgba(0,0,0,0.12);

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

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

    /* 过渡 */
    --tool-transition: all 0.15s 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);
}