:root {
    --sd-primary: #1d4ed8;
    --sd-primary-dark: #1e40af;
    --sd-text: #1f2937;
    --sd-muted: #6b7280;
    --sd-border: #e5e7eb;
    --sd-bg: #f5f7fa;
    --sd-radius: 8px;
}

* { box-sizing: border-box; }

body.sd-web {
    margin: 0;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
    color: var(--sd-text);
    background: var(--sd-bg);
    line-height: 1.7;
    font-size: 16px;
}

a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }

.sd-container { width: 100%; max-width: 1160px; margin: 0 auto; padding: 0 20px; }

/* ===== 顶栏 ===== */
.sd-header {
    background: #fff;
    border-bottom: 1px solid var(--sd-border);
    position: sticky;
    top: 0;
    z-index: 50;
}
.sd-header .sd-container { display: flex; align-items: center; justify-content: space-between; height: 68px; }
.sd-brand { display: flex; align-items: center; gap: 10px; font-size: 20px; font-weight: 700; color: var(--sd-primary); }
.sd-brand img { height: 36px; width: auto; }
.sd-nav { display: flex; align-items: center; gap: 4px; list-style: none; margin: 0; padding: 0; }
.sd-nav > li { position: relative; }
.sd-nav > li > a { display: block; padding: 10px 14px; border-radius: 6px; font-size: 15px; color: var(--sd-text); transition: .15s; }
.sd-nav > li > a:hover, .sd-nav > li.active > a { color: var(--sd-primary); background: rgba(29, 78, 216, .08); }
.sd-nav .sd-submenu { position: absolute; top: 100%; left: 0; min-width: 160px; background: #fff; border: 1px solid var(--sd-border); border-radius: var(--sd-radius); box-shadow: 0 8px 24px rgba(0,0,0,.08); padding: 6px; display: none; list-style: none; margin: 0; }
.sd-nav li:hover > .sd-submenu { display: block; }
.sd-submenu a { display: block; padding: 8px 12px; border-radius: 6px; font-size: 14px; }
.sd-submenu a:hover { background: var(--sd-bg); color: var(--sd-primary); }

/* ===== 通用区块 ===== */
.sd-main { padding: 32px 0 56px; }
.sd-hero { background: linear-gradient(135deg, var(--sd-primary), var(--sd-primary-dark)); color: #fff; border-radius: var(--sd-radius); padding: 56px 32px; margin-bottom: 32px; }
.sd-hero h1 { margin: 0 0 12px; font-size: 34px; }
.sd-hero p { margin: 0; opacity: .92; font-size: 17px; }

.sd-section-title { font-size: 22px; margin: 8px 0 20px; padding-left: 12px; border-left: 4px solid var(--sd-primary); }
.sd-page-head { background: #fff; border: 1px solid var(--sd-border); border-radius: var(--sd-radius); padding: 28px 24px; margin-bottom: 24px; }
.sd-page-head h1 { margin: 0; font-size: 26px; }
.sd-breadcrumb { font-size: 14px; color: var(--sd-muted); margin-bottom: 10px; }
.sd-breadcrumb a:hover { color: var(--sd-primary); }

/* ===== Banner 轮播 ===== */
.sd-banner { position: relative; border-radius: var(--sd-radius); overflow: hidden; margin-bottom: 32px; background: #0f172a; }
.sd-banner-slide { display: none; position: relative; }
.sd-banner-slide.active { display: block; animation: sdFade .6s ease; }
@keyframes sdFade { from { opacity: .35; } to { opacity: 1; } }
.sd-banner-slide a { display: block; }
.sd-banner img { width: 100%; height: 400px; object-fit: cover; }
.sd-banner-caption { position: absolute; left: 0; right: 0; bottom: 0; padding: 20px 24px; color: #fff; font-size: 20px; font-weight: 600; background: linear-gradient(transparent, rgba(0,0,0,.55)); }
.sd-banner-nav { position: absolute; top: 50%; transform: translateY(-50%); width: 44px; height: 44px; border: none; border-radius: 50%; background: rgba(0,0,0,.35); color: #fff; font-size: 20px; cursor: pointer; transition: .15s; }
.sd-banner-nav:hover { background: rgba(0,0,0,.6); }
.sd-banner-nav.prev { left: 16px; }
.sd-banner-nav.next { right: 16px; }
.sd-banner-dots { position: absolute; bottom: 14px; left: 0; right: 0; display: flex; justify-content: center; gap: 8px; }
.sd-banner-dots .dot { width: 10px; height: 10px; border-radius: 50%; background: rgba(255,255,255,.5); cursor: pointer; }
.sd-banner-dots .dot.active { background: #fff; }

/* ===== 卡片网格 ===== */
.sd-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.sd-grid.cols-2 { grid-template-columns: repeat(2, 1fr); }
.sd-card { background: #fff; border: 1px solid var(--sd-border); border-radius: var(--sd-radius); overflow: hidden; transition: .18s; display: flex; flex-direction: column; }
.sd-card:hover { transform: translateY(-3px); box-shadow: 0 10px 26px rgba(0,0,0,.08); border-color: #c7d2fe; }
.sd-card .thumb { aspect-ratio: 16/10; background: #eef2ff; overflow: hidden; }
.sd-card .thumb img { width: 100%; height: 100%; object-fit: cover; }
.sd-card .body { padding: 16px 18px 18px; display: flex; flex-direction: column; gap: 8px; flex: 1; }
.sd-card h3 { margin: 0; font-size: 17px; line-height: 1.5; }
.sd-card .summary { margin: 0; color: var(--sd-muted); font-size: 14px; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.sd-card .meta { margin-top: auto; font-size: 13px; color: var(--sd-muted); display: flex; justify-content: space-between; }
.sd-tag { display: inline-block; font-size: 12px; color: var(--sd-primary); background: rgba(29,78,216,.08); padding: 2px 8px; border-radius: 999px; }

/* ===== 富文本正文 ===== */
.sd-prose { background: #fff; border: 1px solid var(--sd-border); border-radius: var(--sd-radius); padding: 32px; }
.sd-prose h2 { font-size: 22px; margin: 28px 0 12px; }
.sd-prose h3 { font-size: 19px; margin: 22px 0 10px; }
.sd-prose p { margin: 12px 0; }
.sd-prose img { border-radius: 6px; margin: 16px auto; }
.sd-prose ul, .sd-prose ol { padding-left: 24px; }
.sd-prose table { width: 100%; border-collapse: collapse; margin: 16px 0; }
.sd-prose th, .sd-prose td { border: 1px solid var(--sd-border); padding: 8px 10px; }
.sd-prose blockquote { border-left: 4px solid var(--sd-primary); margin: 16px 0; padding: 6px 16px; color: var(--sd-muted); background: var(--sd-bg); }

.sd-article-meta { color: var(--sd-muted); font-size: 14px; margin: 6px 0 20px; display: flex; gap: 18px; flex-wrap: wrap; }
.sd-pagenav { display: flex; justify-content: space-between; gap: 12px; margin-top: 24px; }
.sd-pagenav a { flex: 1; background: #fff; border: 1px solid var(--sd-border); border-radius: var(--sd-radius); padding: 14px 16px; font-size: 14px; }
.sd-pagenav a:hover { border-color: var(--sd-primary); color: var(--sd-primary); }
.sd-pagenav .next { text-align: right; }

/* ===== 分页 ===== */
.sd-pagination { display: flex; gap: 6px; justify-content: center; margin-top: 28px; flex-wrap: wrap; }
.sd-page-item { min-width: 38px; height: 38px; display: inline-flex; align-items: center; justify-content: center; padding: 0 10px; background: #fff; border: 1px solid var(--sd-border); border-radius: 6px; font-size: 14px; color: var(--sd-text); }
.sd-page-item:hover { border-color: var(--sd-primary); color: var(--sd-primary); }
.sd-page-item.active { background: var(--sd-primary); border-color: var(--sd-primary); color: #fff; }
.sd-page-item.disabled { color: var(--sd-muted); background: var(--sd-bg); cursor: default; }

/* ===== 表单 ===== */
.sd-form { background: #fff; border: 1px solid var(--sd-border); border-radius: var(--sd-radius); padding: 24px; }
.sd-form .row { margin-bottom: 16px; }
.sd-form label { display: block; font-size: 14px; margin-bottom: 6px; }
.sd-form input, .sd-form textarea { width: 100%; padding: 10px 12px; border: 1px solid var(--sd-border); border-radius: 6px; font-size: 15px; font-family: inherit; }
.sd-form input:focus, .sd-form textarea:focus { outline: none; border-color: var(--sd-primary); }
.sd-form .hp { position: absolute; left: -9999px; }
.sd-form .grid2 { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.sd-btn { display: inline-block; background: var(--sd-primary); color: #fff; border: none; padding: 11px 26px; border-radius: 6px; font-size: 15px; cursor: pointer; }
.sd-btn:hover { background: var(--sd-primary-dark); }
.sd-alert { padding: 12px 16px; border-radius: 6px; margin-bottom: 16px; font-size: 14px; }
.sd-alert.success { background: #ecfdf5; color: #047857; border: 1px solid #a7f3d0; }
.sd-errors { background: #fef2f2; color: #b91c1c; border: 1px solid #fecaca; border-radius: 6px; padding: 12px 16px; margin-bottom: 16px; font-size: 14px; }
.sd-errors ul { margin: 0; padding-left: 18px; }

/* ===== 侧栏（列表页） ===== */
.sd-layout { display: grid; grid-template-columns: 1fr 280px; gap: 24px; align-items: start; }
.sd-side { background: #fff; border: 1px solid var(--sd-border); border-radius: var(--sd-radius); padding: 16px; }
.sd-side h4 { margin: 4px 0 12px; font-size: 16px; }
.sd-side ul { list-style: none; margin: 0; padding: 0; }
.sd-side li a { display: block; padding: 8px 10px; border-radius: 6px; font-size: 15px; }
.sd-side li a:hover, .sd-side li a.active { background: var(--sd-bg); color: var(--sd-primary); }

/* ===== 页脚 ===== */
.sd-footer { background: #111827; color: #cbd5e1; padding: 40px 0 20px; margin-top: 40px; }
.sd-footer a { color: #cbd5e1; }
.sd-footer a:hover { color: #fff; }
.sd-footer .cols { display: grid; grid-template-columns: 2fr 1fr 1fr; gap: 32px; }
.sd-footer h5 { color: #fff; font-size: 16px; margin: 0 0 14px; }
.sd-footer ul { list-style: none; margin: 0; padding: 0; }
.sd-footer li { margin-bottom: 8px; font-size: 14px; }
.sd-footer .contact li { display: flex; gap: 8px; }
.sd-footer .qrcode img { width: 110px; height: 110px; border-radius: 6px; background: #fff; padding: 6px; }
.sd-footer .bottom { border-top: 1px solid #374151; margin-top: 28px; padding-top: 16px; font-size: 13px; color: #9ca3af; text-align: center; }
.sd-footer .bottom a { color: #9ca3af; }
.sd-links-inline { display: flex; flex-wrap: wrap; gap: 14px; font-size: 13px; }

/* ===== 响应式 ===== */
@media (max-width: 900px) {
    .sd-grid, .sd-grid.cols-2 { grid-template-columns: repeat(2, 1fr); }
    .sd-layout { grid-template-columns: 1fr; }
    .sd-footer .cols { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 600px) {
    .sd-nav { display: none; }
    .sd-grid, .sd-grid.cols-2 { grid-template-columns: 1fr; }
    .sd-hero { padding: 36px 20px; }
    .sd-hero h1 { font-size: 26px; }
    .sd-form .grid2 { grid-template-columns: 1fr; }
    .sd-footer .cols { grid-template-columns: 1fr; }
}