/* 第2套：功能驱动 · 左侧栏暖橙 · 编号功能行 */
html { box-sizing: border-box; }
*, *::before, *::after { box-sizing: inherit; }
body {
  margin: 0;
  background: #fff8f0;
  color: #2b2118;
  font: 17px/1.7 "Trebuchet MS", "Microsoft YaHei", sans-serif;
}
.sideframe {
  display: grid;
  grid-template-columns: 220px 1fr;
  min-height: 100vh;
}
.rail {
  background: #2b2118;
  color: #f6e6d4;
  padding: 22px 16px;
  position: sticky;
  top: 0;
  height: 100vh;
}
.mark {
  display: block;
  color: #f4a261;
  text-decoration: none;
  font-weight: 800;
  letter-spacing: 0.04em;
  margin-bottom: 28px;
}
.rail nav a {
  display: block;
  color: #f6e6d4;
  text-decoration: none;
  padding: 10px 8px;
  border-left: 3px solid transparent;
  margin: 4px 0;
}
.rail nav a.here {
  border-left-color: #f4a261;
  background: #3c2e22;
  color: #f4a261;
}
.stage { padding: 0 0 40px; }
.banner {
  background: #c45c26;
  color: #fff;
  padding: 40px 36px 44px;
}
.banner h1 { margin: 0 0 14px; font-size: 30px; line-height: 1.35; }
.act { margin-top: 20px; }
.act a {
  display: inline-block;
  margin: 0 8px 8px 0;
  padding: 11px 18px;
  text-decoration: none;
  font-weight: 700;
}
.act .go { background: #2b2118; color: #ffd8a8; }
.act .ghost { background: #fff; color: #c45c26; }
.stack { padding: 8px 36px 0; max-width: 860px; }
.feat-row {
  display: grid;
  grid-template-columns: 56px 1fr;
  gap: 12px;
  padding: 22px 0;
  border-bottom: 1px dashed #e0c8b0;
}
.feat-num {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: #f4a261;
  color: #2b2118;
  font: 800 20px/48px Georgia, serif;
  text-align: center;
}
.feat-row h2 { margin: 0 0 8px; font-size: 21px; color: #9a3412; }
.qbox { background: #fff; border: 1px solid #ecd4bc; padding: 18px 20px; margin: 16px 0; }
.qbox h3 { margin: 0 0 6px; font-size: 16px; }
.base {
  background: #2b2118;
  color: #e8d5c4;
  padding: 24px 36px 32px;
  font-size: 13px;
}
.base a { color: #f4a261; }
.ok { color: #ffd8a8; }
.plist { margin: 0; padding-left: 18px; }
.plist li { margin: 6px 0; }
.pack a {
  display: inline-block;
  background: #c45c26;
  color: #fff;
  padding: 8px 12px;
  margin: 4px 6px 4px 0;
  text-decoration: none;
}
@media (max-width: 800px) {
  .sideframe { grid-template-columns: 1fr; }
  .rail { position: relative; height: auto; }
  .stack, .banner, .base { padding-left: 18px; padding-right: 18px; }
}