/* ============================================================
   全局基础样式 —— 供所有页面复用 (wwwroot/css/site.css)
   ============================================================ */

:root {
    --primary: #2563eb;
    --primary-dark: #1d4ed8;
    --ink: #111827;
    --muted: #6b7280;
    --line: #e5e7eb;
    --bg-soft: #f3f4f6;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: "PingFang SC", "Microsoft YaHei", "Segoe UI", -apple-system, sans-serif;
    color: var(--ink);
    background: #fff;
    line-height: 1.6;
}

a {
    text-decoration: none;
    color: var(--primary);
}

/* ---------- 按钮 ---------- */
.btn {
    display: inline-block;
    padding: 8px 18px;
    border-radius: 8px;
    font-size: 15px;
    border: 1px solid transparent;
    cursor: pointer;
    transition: background .15s, color .15s;
}

.btn-outline {
    color: var(--primary);
    border-color: var(--primary);
    background: #fff;
}

.btn-outline:hover {
    background: #eff6ff;
}

.btn-primary {
    background: var(--primary);
    color: #fff;
}

.btn-primary:hover {
    background: var(--primary-dark);
}

.btn-lg {
    padding: 12px 26px;
    font-size: 16px;
}

/* ---------- 通用布局 ---------- */
section {
    padding: 64px 20px;
}

.container {
    max-width: 1080px;
    margin: 0 auto;
}

.section-title {
    text-align: center;
    font-size: 30px;
    margin-bottom: 40px;
}

.grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 20px;
}

.card {
    background: #fff;
    border: 1px solid var(--line);
    border-radius: 14px;
    padding: 24px;
    box-shadow: 0 1px 3px rgba(0, 0, 0, .05);
}

.card h3 {
    font-size: 18px;
    margin-bottom: 8px;
}

.card p {
    color: var(--muted);
    font-size: 15px;
    margin-bottom: 0;
}

.bg-soft {
    background: var(--bg-soft);
}