/* Arolu 官网：单页静态样式。 */
:root {
  --bg: #ffffff;
  --soft: #f6f7f5;
  --text: #1f2b25;
  --secondary: #5d6b63;
  --muted: #67756d;
  --line: #e2e6e1;
  --line-strong: #d3d9d2;
  --green: #187348;
  --wrap: 1080px;
  --font: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
  --mono: ui-monospace, "SF Mono", "Cascadia Mono", Menlo, Consolas, monospace;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  min-width: 340px;
  background: var(--bg);
  color: var(--text);
  font: 15px/1.75 var(--font);
  font-variant-numeric: tabular-nums;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

h1, h2, h3 { margin: 0; font-weight: 600; }
p, ul, ol { margin: 0; }
ul, ol { list-style: none; padding: 0; }
a { color: inherit; text-decoration: none; }
img { display: block; }
svg { display: block; fill: currentColor; }

a:focus-visible, button:focus-visible {
  outline: 2px solid var(--green);
  outline-offset: 3px;
  border-radius: 4px;
}

.wrap { max-width: var(--wrap); margin: 0 auto; padding: 0 28px; }

/* 分区标题 */
.how h2, .support h2 {
  text-align: center;
  font-size: 25px;
  letter-spacing: -0.4px;
}

/* 顶栏 */
.topbar { border-bottom: 1px solid var(--line); }
.bar { display: flex; align-items: center; height: 60px; }
.brand { display: flex; align-items: center; gap: 9px; }
.brand .wordmark { height: 19px; width: auto; }

/* 首屏 */
.hero { padding: 78px 28px 68px; text-align: center; }
.hero h1 { font-size: 44px; line-height: 1.2; letter-spacing: -0.8px; }
.lead { margin: 18px auto 0; font-size: 17px; line-height: 1.8; color: var(--secondary); }

.install { margin: 34px auto 0; max-width: 960px; }

.cmd { position: relative; }
.cmd pre {
  margin: 0;
  padding: 20px 86px 20px 24px;
  border: 1px solid var(--line-strong);
  border-radius: 12px;
  background: var(--soft);
  text-align: left;
  white-space: pre-wrap;
  overflow-wrap: anywhere;
  font: 14px/1.7 var(--mono);
}
.cmd code { font: inherit; }

.copy {
  position: absolute;
  top: 50%;
  right: 12px;
  transform: translateY(-50%);
  padding: 5px 11px;
  border: 1px solid var(--line-strong);
  border-radius: 7px;
  background: var(--bg);
  color: var(--secondary);
  font: 12.5px/1.5 var(--font);
  cursor: pointer;
}
.copy:hover { color: var(--text); border-color: var(--secondary); }

.specs {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 8px 10px;
  margin-top: 20px;
  color: var(--secondary);
  font-size: 13.5px;
}
.specs li + li::before { content: "·"; margin-right: 10px; color: var(--line-strong); }

.links { display: flex; justify-content: center; gap: 22px; margin-top: 24px; }
.links a { color: var(--muted); }
.links a:hover { color: var(--text); }
.links svg { width: 21px; height: 21px; }

/* 三步开始 */
.how { border-top: 1px solid var(--line); padding: 70px 28px; }
.steps {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 40px;
  max-width: 920px;
  margin: 42px auto 0;
}
.steps li { text-align: center; }
.step-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 30px;
  height: 30px;
  border: 1px solid var(--line-strong);
  border-radius: 50%;
  background: var(--soft);
  color: var(--green);
  font-size: 14px;
  font-weight: 600;
}
.steps h3 { margin-top: 14px; font-size: 16px; }
.steps p { margin: 8px auto 0; max-width: 260px; font-size: 13.5px; line-height: 1.75; color: var(--secondary); }

/* 支持范围与信任点 */
.support { border-top: 1px solid var(--line); padding: 70px 28px 76px; }
.logos {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  align-items: center;
  gap: 28px;
  margin-top: 36px;
}
.logos img { width: 36px; height: 36px; object-fit: contain; }

.points {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 40px;
  max-width: 920px;
  margin: 52px auto 0;
}
.points li { text-align: center; }
.points h3 { font-size: 15px; color: var(--green); }
.points p { margin: 7px auto 0; max-width: 250px; font-size: 13.5px; line-height: 1.75; color: var(--secondary); }

/* 页脚：品牌标题与免责声明压在最底部的小字区域 */
footer {
  border-top: 1px solid var(--line);
  padding: 26px 0 30px;
  text-align: center;
  color: var(--secondary);
}
.foot-brand {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  color: var(--text);
  font-size: 13px;
  font-weight: 500;
}
.foot-brand img { width: 16px; height: auto; }
.fineprint { margin: 10px auto 0; max-width: 860px; font-size: 10px; line-height: 1.7; color: var(--muted); }
.fineprint strong { font-weight: 600; color: var(--secondary); }
.fineprint a { color: var(--green); text-decoration: underline; text-underline-offset: 3px; }

/* 免责声明详情页 */
.doc { padding: 60px 28px 80px; max-width: 760px; }
.doc h1 { font-size: 26px; letter-spacing: -0.4px; }
.doc .updated { margin-top: 8px; font-size: 12px; color: var(--muted); }
.doc h2 { margin-top: 34px; font-size: 15px; color: var(--green); }
.doc p { margin-top: 10px; font-size: 13.5px; line-height: 1.85; color: var(--secondary); }
.doc .back { margin-top: 40px; }
.fineprint p + p { margin-top: 5px; }

/* 404 */
.notfound { padding: 130px 28px 150px; text-align: center; }
.notfound h1 { font-size: 30px; letter-spacing: -0.4px; }
.notfound p { margin-top: 14px; color: var(--secondary); }
.link { color: var(--green); text-decoration: underline; text-underline-offset: 3px; }

@media (max-width: 760px) {
  .hero { padding: 54px 28px 52px; }
  .hero h1 { font-size: 31px; }
  .lead { font-size: 16px; }
  .install { margin-top: 28px; }
  .cmd pre { padding: 16px 18px 52px; }
  .copy { top: auto; bottom: 10px; right: 10px; transform: none; }
  .how, .support { padding: 52px 28px; }
  .how h2, .support h2 { font-size: 21px; }
  .steps, .points { grid-template-columns: 1fr; gap: 30px; margin-top: 32px; }
  .logos { gap: 22px; margin-top: 30px; }
}