/* 站17 www.landouseo.com 公共样式 - 橙色主题 #f97316 */
:root {
  --primary: #f97316;
  --primary-dark: #c2410c;
  --primary-light: #fed7aa;
  --primary-bg: #fff7ed;
  --ink: #1f2937;
  --ink-2: #4b5563;
  --ink-3: #9ca3af;
  --line: #e5e7eb;
  --bg: #ffffff;
  --bg-soft: #f9fafb;
  --radius: 12px;
  --shadow: 0 2px 8px rgba(249, 115, 22, 0.08);
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  color: var(--ink);
  background: var(--bg);
  line-height: 1.7;
  font-size: 15px;
}
a { color: var(--primary-dark); text-decoration: none; }
a:hover { color: var(--primary); }
img { max-width: 100%; height: auto; }
h1, h2, h3, h4 { line-height: 1.35; color: var(--ink); margin: 0 0 12px; }
h1 { font-size: 30px; font-weight: 800; }
h2 { font-size: 24px; font-weight: 700; }
h3 { font-size: 18px; font-weight: 700; }
p { margin: 0 0 12px; }
.container { max-width: 1180px; margin: 0 auto; padding: 0 20px; }
.skip-link { position: absolute; left: -9999px; top: 0; background: var(--primary); color: #fff; padding: 8px 16px; z-index: 999; }
.skip-link:focus { left: 10px; top: 10px; }

/* ===== Header ===== */
.site-header {
  position: sticky; top: 0; z-index: 100;
  background: #fff; border-bottom: 1px solid var(--line);
  box-shadow: 0 1px 3px rgba(0,0,0,0.04);
}
.header-inner { display: flex; align-items: center; gap: 20px; padding: 12px 20px; }
.brand { display: flex; align-items: center; gap: 10px; flex-shrink: 0; }
.brand-logo {
  width: 38px; height: 38px; border-radius: 10px;
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  color: #fff; display: flex; align-items: center; justify-content: center;
  font-weight: 800; font-size: 18px;
}
.brand-text { display: flex; flex-direction: column; line-height: 1.2; }
.brand-text strong { font-size: 16px; color: var(--ink); }
.brand-text small { font-size: 11px; color: var(--ink-3); }
.main-nav { flex: 1; }
.nav-list { display: flex; gap: 4px; list-style: none; margin: 0; padding: 0; flex-wrap: wrap; }
.nav-list > li { position: relative; }
.nav-list > li > a {
  display: block; padding: 8px 12px; color: var(--ink-2);
  font-size: 14px; font-weight: 500; border-radius: 6px;
}
.nav-list > li > a:hover { background: var(--primary-bg); color: var(--primary-dark); }
.has-sub:hover .sub-nav { display: block; }
.sub-nav {
  display: none; position: absolute; top: 100%; left: 0;
  background: #fff; min-width: 180px; padding: 6px;
  border: 1px solid var(--line); border-radius: 8px;
  box-shadow: 0 6px 20px rgba(0,0,0,0.08); list-style: none; margin: 0;
}
.sub-nav a { display: block; padding: 8px 12px; font-size: 13px; color: var(--ink-2); border-radius: 4px; }
.sub-nav a:hover { background: var(--primary-bg); color: var(--primary-dark); }
.nav-toggle { display: none; background: none; border: none; font-size: 22px; cursor: pointer; color: var(--ink); }
.cta-order { flex-shrink: 0; }

/* ===== Footer ===== */
.site-footer { background: #111827; color: #d1d5db; margin-top: 60px; }
.footer-grid {
  display: grid; grid-template-columns: 1.4fr 1fr 1fr 1.2fr 1fr;
  gap: 30px; padding: 40px 20px 20px;
}
.footer-col h4 { color: #fff; font-size: 15px; margin-bottom: 14px; }
.footer-col p, .footer-col a { font-size: 13px; color: #9ca3af; display: block; margin-bottom: 6px; line-height: 1.6; }
.footer-col a:hover { color: var(--primary); }
.footer-slogan { color: var(--primary) !important; font-weight: 600; margin-top: 10px; }
.footer-bottom { border-top: 1px solid #1f2937; padding: 16px 0; text-align: center; }
.footer-bottom p { font-size: 12px; color: #6b7280; margin: 0; }
.footer-bottom a { color: #9ca3af; }

/* ===== 通用组件 ===== */
.section { padding: 50px 0; }
.section-alt { background: var(--bg-soft); }
.container-title { text-align: center; margin-bottom: 30px; }
.container-title p { color: var(--ink-3); }
.breadcrumb {
  font-size: 13px; color: var(--ink-3); padding: 16px 0;
}
.breadcrumb a { color: var(--ink-3); }
.breadcrumb a:hover { color: var(--primary-dark); }
.breadcrumb span { margin: 0 6px; }

.btn {
  display: inline-block; padding: 12px 28px; border-radius: 999px;
  font-weight: 700; font-size: 15px; text-decoration: none;
  transition: all .2s;
}
.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-dark); color: #fff; transform: translateY(-1px); }
.btn-outline { background: #fff; color: var(--primary-dark); border: 1.5px solid var(--primary-dark); }
.btn-outline:hover { background: var(--primary-bg); color: var(--primary-dark); }

.card {
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius);
  padding: 24px; box-shadow: var(--shadow);
}
.grid { display: grid; gap: 20px; }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }

.badge {
  display: inline-block; padding: 3px 10px; border-radius: 999px;
  background: var(--primary-bg); color: var(--primary-dark);
  font-size: 12px; font-weight: 600;
}

/* 文章内容 */
.article-content { font-size: 16px; line-height: 1.85; }
.article-content h2 { font-size: 22px; margin-top: 28px; padding-left: 12px; border-left: 4px solid var(--primary); }
.article-content h3 { font-size: 18px; margin-top: 22px; }
.article-content p { margin-bottom: 14px; }
.article-content table { width: 100%; border-collapse: collapse; margin: 16px 0; }
.article-content th, .article-content td { border: 1px solid var(--line); padding: 10px 12px; text-align: left; font-size: 14px; }
.article-content th { background: var(--primary-bg); }
.article-content figure { margin: 16px 0; text-align: center; }
.article-content figcaption { font-size: 13px; color: var(--ink-3); margin-top: 6px; }
.article-content ul, .article-content ol { padding-left: 24px; margin-bottom: 14px; }

/* ===== 移动端适配 ===== */
@media (max-width: 900px) {
  .grid-3, .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: repeat(2, 1fr); gap: 20px; }
}
@media (max-width: 640px) {
  h1 { font-size: 24px; }
  h2 { font-size: 20px; }
  .header-inner { flex-wrap: wrap; gap: 10px; padding: 10px 16px; }
  .nav-toggle { display: block; }
  .main-nav { order: 3; width: 100%; }
  .nav-list { display: none; width: 100%; flex-direction: column; gap: 0; padding: 10px 0; }
  .nav-list.open { display: flex; }
  .nav-list > li > a { padding: 12px 16px; }
  .sub-nav { position: static; box-shadow: none; border: none; padding-left: 16px; }
  .cta-order { padding: 6px 12px !important; font-size: 13px !important; }
  .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; gap: 16px; padding: 30px 16px 10px; }
  .section { padding: 30px 0; }
  .container { padding: 0 16px; }
}