/* steel browser chrome: faux window shell, 50/50 compare panes */
:root {
  --chrome-steel: #455A64;
  --chrome-mist: #ECEFF1;
  --chrome-ink: #263238;
  --chrome-bar: #90A4AE;
  --chrome-line: #78909C;
  --chrome-panel: #FAFBFC;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  background: #CFD8DC;
  color: var(--chrome-ink);
  line-height: 1.7;
  font-size: 16px;
}

.cr-top {
  background: var(--chrome-steel);
  color: #ECEFF1;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.6rem 1rem;
  padding: 0.55rem 2.5vw;
}
.cr-brand {
  color: #fff;
  text-decoration: none;
  font-weight: 700;
  font-size: 0.95rem;
}
.cr-nav { display: flex; flex-wrap: wrap; gap: 0.2rem 0.9rem; list-style: none; }
.cr-nav a { color: #CFD8DC; text-decoration: none; font-size: 0.82rem; }
.cr-nav a:hover { color: #fff; }

.cr-frame {
  width: min(1040px, 94vw);
  margin: 1.1rem auto 2rem;
  background: var(--chrome-panel);
  border: 2px solid var(--chrome-ink);
  box-shadow: 0 8px 0 rgba(38, 50, 56, 0.18);
}
.cr-titlebar {
  background: var(--chrome-mist);
  border-bottom: 2px solid var(--chrome-ink);
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: 0.6rem;
  align-items: center;
  padding: 0.4rem 0.55rem;
}
.cr-lights { display: flex; gap: 5px; }
.cr-lights span {
  width: 11px;
  height: 11px;
  background: var(--chrome-bar);
  display: block;
}
.cr-tabs { display: flex; gap: 2px; min-width: 0; }
.cr-tabs b, .cr-tabs i {
  font-style: normal;
  font-weight: 600;
  font-size: 0.75rem;
  background: #fff;
  border: 1px solid var(--chrome-line);
  padding: 0.22rem 0.55rem;
  white-space: nowrap;
}
.cr-tabs i { background: transparent; color: #607D8B; }
.cr-winbtns { font-size: 0.7rem; color: #607D8B; letter-spacing: 0.2em; }
.cr-omnibox {
  background: #fff;
  border-bottom: 1px solid var(--chrome-line);
  padding: 0.4rem 0.7rem;
  font-family: Consolas, "Courier New", monospace;
  font-size: 0.8rem;
  color: var(--chrome-steel);
}
.cr-hero-body { padding: 1.25rem 1.2rem 1.3rem; }
.cr-hero-body h1 {
  font-size: clamp(1.35rem, 2.8vw, 1.9rem);
  line-height: 1.35;
  max-width: 22em;
}
.cr-hero-body p { margin-top: 0.6rem; max-width: 42em; color: #455A64; }

.cr-section {
  width: min(1040px, 94vw);
  margin: 0 auto 0.9rem;
  background: #fff;
  border: 2px solid var(--chrome-steel);
  padding: 1.2rem 1.15rem 1.3rem;
}
.cr-section h2 {
  font-size: 1.2rem;
  background: var(--chrome-mist);
  margin: -1.2rem -1.15rem 0.85rem;
  padding: 0.55rem 1.15rem;
  border-bottom: 2px solid var(--chrome-steel);
}
.cr-section p { margin-bottom: 0.65rem; }

.cr-three {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 0;
  border: 2px solid var(--chrome-bar);
  margin-top: 0.6rem;
}
.cr-three article {
  padding: 0.85rem 0.8rem;
  border-right: 2px solid var(--chrome-bar);
}
.cr-three article:last-child { border-right: 0; }
.cr-three h3 { font-size: 0.95rem; margin-bottom: 0.35rem; color: var(--chrome-steel); }

.cr-compare {
  width: 100%;
  border-collapse: collapse;
  margin-top: 0.5rem;
  font-size: 0.93rem;
}
.cr-compare th, .cr-compare td {
  border: 1px solid var(--chrome-bar);
  padding: 0.55rem 0.6rem;
  text-align: left;
  vertical-align: top;
}
.cr-compare th { background: var(--chrome-ink); color: #ECEFF1; }
.cr-compare td:first-child { width: 22%; background: var(--chrome-mist); font-weight: 650; }

.cr-ol { margin: 0.4rem 0 0 1.15rem; }
.cr-ol li { margin: 0.4rem 0; }

.cr-flood {
  background: var(--chrome-mist);
  border-left: 6px solid var(--chrome-steel);
  padding: 0.85rem 1rem;
  margin-top: 0.5rem;
}

.cr-twin {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0;
  margin-top: 0.55rem;
  border: 2px solid var(--chrome-ink);
}
.cr-twin article { padding: 0.9rem 0.95rem; }
.cr-twin article + article { border-left: 2px solid var(--chrome-ink); }
.cr-twin h3 { font-size: 0.96rem; margin-bottom: 0.35rem; }

.cr-faq details {
  border: 1px solid var(--chrome-bar);
  margin-bottom: 0.4rem;
  padding: 0.55rem 0.7rem;
}
.cr-faq summary { cursor: pointer; font-weight: 700; }
.cr-faq p { margin-top: 0.4rem; }

.cr-foot {
  background: var(--chrome-ink);
  color: #B0BEC5;
  padding: 1.4rem 2.5vw 1.8rem;
  font-size: 0.88rem;
}
.cr-foot p { margin-bottom: 0.45rem; max-width: 58em; }

@media (max-width: 800px) {
  .cr-three, .cr-twin { grid-template-columns: 1fr; }
  .cr-three article, .cr-twin article + article { border-right: 0; border-left: 0; border-top: 2px solid var(--chrome-bar); }
  .cr-titlebar { grid-template-columns: 1fr; }
}

.cr-three article svg, .cr-twin article svg { width:28px; height:28px; display:block; margin-bottom:0.35rem; }