/* 同帧 · 海上日记的二级页
   与首页同一套栅格：1080 / 48 / 132px 标签列。 */

:root{
  --bg:#F2F1F9;
  --ink:#1B1A22;
  --ink-2:#55525F;
  --ink-3:#8B8799;
  --line:rgba(27,26,34,.09);
  --accent:#8A79C4;
  --rose:#C97FA6;
  --violet:#7D6BB3;
  --serif:"Source Han Serif SC","Noto Serif SC","Songti SC",Georgia,"Times New Roman",serif;
  --sans:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
  --mono:ui-monospace,"SF Mono","Cascadia Mono",Consolas,"Liberation Mono",monospace;
  --wrap:1080px;
  --pad:48px;
}

*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;overflow-x:hidden}
body{
  position:relative;min-height:100vh;display:flex;flex-direction:column;
  margin:0;color:var(--ink);overflow-x:hidden;
  font-family:var(--sans);font-size:16px;line-height:1.7;
  -webkit-font-smoothing:antialiased;background:var(--bg);
}
body::before{
  content:"";position:absolute;inset:0;z-index:-1;pointer-events:none;
  background:
    radial-gradient(54% 34% at 12% 2%, rgba(206,186,242,.78), transparent 66%),
    radial-gradient(50% 32% at 89% 0%, rgba(248,188,213,.72), transparent 66%),
    radial-gradient(40% 26% at 22% 32%, rgba(180,208,247,.72), transparent 68%),
    radial-gradient(36% 24% at 82% 30%, rgba(222,196,242,.68), transparent 68%),
    radial-gradient(44% 28% at 52% 92%, rgba(188,212,246,.58), transparent 70%);
}
a{color:inherit;text-decoration:none}
:focus-visible{outline:2px solid var(--ink);outline-offset:3px;border-radius:6px}
.skip{position:absolute;left:-9999px}
.skip:focus{left:16px;top:16px;z-index:9;background:#17161F;color:#fff;padding:8px 14px;border-radius:8px}

.wrap{max-width:var(--wrap);margin:0 auto;padding:0 var(--pad);flex:1 0 auto;width:100%}
/* 导航留在顶部，正文在剩余高度里居中，避免底部空一块 */
body > .wrap{display:flex;flex-direction:column}
body > .wrap > main{flex:1;display:flex;flex-direction:column;justify-content:center}

/* 顶栏 */
.top{display:flex;align-items:baseline;gap:24px;padding:30px 0 0}
.back{font-family:var(--mono);font-size:10.5px;letter-spacing:.12em;color:var(--ink-3)}
.back:hover{color:var(--ink)}
.nav{display:flex;gap:22px;margin-left:auto;font-size:12.5px;color:var(--ink-3)}
.nav a{padding-bottom:3px;border-bottom:1px solid transparent}
.nav a:hover{color:var(--ink)}
.nav a.on{color:var(--ink);border-color:var(--rose)}

/* 通用两栏：标签 + 内容 */
.intro,.facts,.download{
  display:grid;grid-template-columns:132px minmax(0,1fr);gap:40px;
  padding:clamp(34px,5.2vh,84px) 0;border-top:1px solid var(--line);
}
.intro{margin-top:clamp(24px,4vh,60px);border-top:0;padding-top:0}
.label{
  margin:6px 0 0;font-family:var(--mono);font-size:10.5px;
  letter-spacing:.24em;color:#9C93A6;font-weight:400;
}

/* 首屏 */
h1{
  margin:0;font-size:clamp(32px,4.2vw,50px);line-height:1.24;
  font-weight:700;letter-spacing:-.01em;color:#17161F;
}
h1 .accent{
  background:linear-gradient(96deg,var(--rose) 10%,var(--accent) 90%);
  -webkit-background-clip:text;background-clip:text;color:transparent;
}
.lead{margin:18px 0 0;max-width:32em;font-size:16px;line-height:1.95;color:var(--ink-2)}
.cta{display:flex;flex-wrap:wrap;gap:9px;margin-top:24px}
.btn{
  display:inline-flex;align-items:center;justify-content:center;
  padding:11px 20px;border-radius:999px;font-size:13.5px;
  transition:transform .2s ease,box-shadow .2s ease,background .2s ease;
}
.btn.primary{color:#fff;background:#1B1A22;box-shadow:0 14px 28px -18px rgba(27,26,34,.6)}
.btn.primary:hover{transform:translateY(-2px);background:#2A2830}
.btn.ghost{background:rgba(255,255,255,.66);border:1px solid rgba(255,255,255,.9);-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px)}
.btn.ghost:hover{background:rgba(255,255,255,.92);transform:translateY(-2px)}
.meta{margin:14px 0 0;font-family:var(--mono);font-size:10.5px;letter-spacing:.06em;color:var(--ink-3)}

/* 四条事实 */
.facts ul{
  list-style:none;margin:0;padding:0;
  display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:22px 40px;
}
.facts li{display:grid;grid-template-columns:18px minmax(0,1fr);column-gap:12px;align-items:start}
.facts svg{grid-column:1;grid-row:1 / span 2;width:17px;height:17px;color:var(--accent);margin-top:3px}
.facts b{grid-column:2;grid-row:1;font-size:14px;font-weight:600;color:#241F2B}
.facts span{grid-column:2;grid-row:2;font-size:13px;line-height:1.6;color:var(--ink-3)}

/* 下载 */
.ver{margin:0;font-size:14.5px;color:var(--ink-2)}
.ver b{color:var(--rose-deep)}
.fine{margin:6px 0 0;font-size:12px;color:var(--ink-3)}

/* 页脚 */
.foot{border-top:1px solid var(--line);margin-top:auto}
.foot .wrap{
  display:flex;flex-wrap:wrap;justify-content:space-between;gap:8px;
  padding-top:20px;padding-bottom:46px;
  font-size:11.5px;color:#9A93A6;letter-spacing:.03em;
}
.foot a:hover{color:var(--ink-2)}

/* 响应式 */
@media (max-width:760px){
  :root{--pad:20px}
  .top{padding:20px 0 0;gap:14px;flex-wrap:wrap}
  .nav{gap:16px;font-size:11.5px}
  .intro,.facts,.download{grid-template-columns:1fr;gap:14px;padding:34px 0}
  .intro{padding-top:0;margin-top:26px}
  .label{margin:0}
  h1{font-size:clamp(27px,7.6vw,34px)}
  .lead{font-size:14.5px}
  .facts ul{grid-template-columns:1fr;gap:16px}
  .download{padding-bottom:38px}
  .foot .wrap{font-size:10.5px}
}