/* ====== 基础布局（触底页脚） ====== */
html, body { height: 100%; margin: 0; }
body {
  font: 16px/1.6 ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, "PingFang SC", "Microsoft YaHei", Arial, sans-serif;
  color: #0a2540;
  background:
    radial-gradient(1200px 600px at 70% -10%, rgba(47,128,237,.10), transparent 60%),
    linear-gradient(180deg,#f6f9ff 0%,#f1f5ff 18%,#eef2ff 40%,#f7f9ff 100%);
}
.wrap { min-height: 100%; display: flex; flex-direction: column; max-width: 1200px; margin: 0 auto; padding: 0 16px; }
main { flex: 1; }

/* ====== 头部（毛玻璃导航） ====== */
header {
  display: flex; align-items: center; justify-content: space-between; gap: 14px;
  padding: 12px 16px; margin: 4px 0 16px;
  background: linear-gradient(180deg, rgba(255,255,255,.78), rgba(255,255,255,.62));
  border: 1px solid rgba(20,40,80,.08);
  border-radius: 14px;
  backdrop-filter: saturate(120%) blur(8px);
  box-shadow: 0 10px 24px rgba(10,37,64,.08);
}
.brand { display: flex; align-items: center; gap: 12px; }
.logo {
  width: 40px; height: 40px; border-radius: 10px;
  background: linear-gradient(135deg,#0d4bcf,#2f80ed);
  display: grid; place-items: center; color: #fff; font-weight: 800;
  box-shadow: 0 6px 16px rgba(13,75,207,.20);
}
.slogan { font-size: 18px; font-weight: 800; letter-spacing: .2px; }
.tag { font-size: 12px; color: #4b5b78; background: linear-gradient(90deg,#eef4ff,#f6f9ff); padding: 4px 10px; border-radius: 999px; }

.nav a{
  display: inline-block;
  color:#3b4a66; background:#ffffffc9;
  border:1px solid rgba(20,40,80,.08);
  border-radius:12px; margin-left:8px; padding:8px 12px;
  box-shadow:0 4px 10px rgba(10,37,64,.05); transition:.2s;
  text-decoration: none;
}
.nav a:hover{ transform: translateY(-1px); box-shadow:0 8px 18px rgba(10,37,64,.10); }
.nav a.active {
  background: #2563eb;
  color: #fff;
  border-color: #2563eb;
}
.nav a.active:hover {
  background: #1d4ed8;
}

/* ====== 主面板 & 卡片网格 ====== */
.panel{
  background:#fff; border:1px solid rgba(20,40,80,.06);
  border-radius: 16px; padding: 18px 18px;
  box-shadow:0 16px 36px rgba(10,37,64,.08);
}
.h1{ font-size: clamp(22px,2.6vw,32px); margin: 4px 0 8px; letter-spacing:.2px; }
.sub{ color:#5c6d88; }

.grid { display:grid; grid-template-columns: repeat(3, minmax(240px,1fr)); gap: 16px; margin-top: 14px; }
@media (max-width: 1000px) { .grid { grid-template-columns: repeat(2, minmax(240px,1fr)); } }
@media (max-width: 640px)  { .grid { grid-template-columns: 1fr; } }

.card{
  display:flex; flex-direction:column; gap:8px; min-height:130px; padding:14px;
  background: linear-gradient(180deg, rgba(255,255,255,.96), #fff);
  border:1px solid rgba(20,40,80,.08);
  border-radius: 14px;
  box-shadow: 0 10px 24px rgba(10,37,64,.08);
  text-decoration: none; color: inherit;
}
.card:hover{ transform: translateY(-2px); box-shadow:0 16px 30px rgba(10,37,64,.12); }
.card b{ font-size:16px; }
.card .pill{
  display:inline-flex; align-items:center; gap:8px;
  padding:8px 12px; border-radius:999px;
  border:1px solid rgba(47,128,237,.20); background: linear-gradient(180deg,#ffffff,#f7faff);
}
.card .pill::after{ content:"→"; margin-left:8px; opacity:.9; transition: transform .18s; }
.card:hover .pill::after{ transform: translateX(2px); }

/* ====== 页脚（触底 + 分层） ====== */
footer.foot{
  margin-bottom: 16px;
  background: linear-gradient(180deg, rgba(255,255,255,.75), rgba(255,255,255,.9));
  border-top: 1px solid rgba(20,40,80,.10);
  padding: 12px 10px; text-align: center; font-size: 14px; color:#4b5b78;
}
footer .beian{ color:#3b5bd6; text-decoration:none; border-bottom:1px dotted rgba(59,91,214,.4); }
footer .beian:hover{ border-bottom-color: rgba(59,91,214,.8); }

.sr{ position:absolute; clip:rect(1px,1px,1px,1px); padding:0; border:0; height:1px; width:1px; overflow:hidden }

.instructions{}

.grid .card {
  min-height: 150px; /* 根据实际高度调整 */
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

/* 文章正文排版（可选） */
article.content h2 { font-size: 1.35rem; margin-top: 1.2rem; }
article.content h3 { font-size: 1.15rem; margin-top: 1rem; }
article.content p  { margin: .6rem 0; }
article.content pre, article.content code {
  background: #f5f7fb; border: 1px solid #e5e7eb; border-radius: 8px;
}
article.content pre { padding: 12px; overflow:auto; }
article.content code { padding: 2px 6px; }
article.content a { color: #2563eb; text-decoration: none; }
article.content a:hover { text-decoration: underline; }
/* —— 专题卡片小修复 —— */
.sub.auto { height: auto !important; }             /* 用于覆盖 60px 的默认高度 */
.card a.pill {                                      /* 让按钮用 pill 风格，不要紫色下划线 */
  text-decoration: none;
  color: inherit;
}
.card a.pill:hover {
  border-color: rgba(37,99,235,.35);
}
.logo a { color: inherit; text-decoration: none; display: inline-block; }