@charset "UTF-8";
/* INPUT: 两种语言的首页、横版湖景预览和浏览器视口。 */
/* OUTPUT: 可滚动、可键盘访问的落地页布局。 */
/* POS: Stillwater 落地页与 404 的公共样式。 */
/* PROTOCOL: 调整布局或配色后检查两种语言和窄屏，再检查目录文档。 */
:root {
  color-scheme: dark;
  --water: #092d27;
  --deep: #082620;
  --line: #ffffff29;
  --text: #f3f1e5;
  --muted: #b7cbbf;
  --accent: #e7e9b8;
  --serif: "Cormorant Garamond", "Songti SC", "Noto Serif CJK SC", Georgia, serif;
  font: 16px/1.6 "Instrument Sans", "PingFang SC", "Microsoft YaHei", Arial, sans-serif;
  color: var(--text);
  background: var(--water);
}

*, *::before, *::after { box-sizing: border-box; }
body { margin: 0; }
a { color: inherit; }
img { display: block; max-width: 100%; }
h1, h2, h3, p, figure { margin: 0; }
nav a, .logo, .actions a, .site-footer a { text-decoration: none; }
a:focus-visible, summary:focus-visible { outline: 2px solid var(--accent); outline-offset: 5px; }
main:focus { outline: none; }
.skip { position: fixed; z-index: 4; top: 12px; left: 12px; padding: 8px 16px; background: var(--deep); transform: translateY(-160%); }
.skip:focus { transform: none; }

.site-header, .hero, .reading, .site-footer, .missing {
  width: min(calc(100% - 2 * clamp(18px, 5vw, 84px)), 1380px);
  margin-inline: auto;
}
.site-header {
  min-height: 78px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  border-bottom: 1px solid var(--line);
}
.logo, nav, .actions { display: flex; align-items: center; }
.logo { gap: 12px; font: 500 clamp(19px, 2.3vw, 27px)/1.1 var(--serif); }
.logo img { border-radius: 10px; }
nav { gap: clamp(12px, 3vw, 34px); }
nav a, .site-footer a { color: var(--muted); font-size: .875rem; }
nav a:hover, .site-footer a:hover { color: var(--text); }
.locale { padding: 7px 14px; border: 1px solid var(--line); border-radius: 99px; }

.hero {
  display: grid;
  grid-template-columns: minmax(0, .85fr) minmax(0, 1.15fr);
  align-items: center;
  gap: clamp(28px, 5vw, 92px);
  padding-block: clamp(44px, 8.5vw, 126px);
}
h1, h2 { font: 400 2.65rem/1.03 var(--serif); text-wrap: balance; }
h1 { font-size: clamp(2.7rem, 5.2vw, 5.75rem); letter-spacing: -.044em; }
html[lang="zh"] h1 { font-size: clamp(2.7rem, 4.8vw, 5.3rem); letter-spacing: .025em; }
.hero-copy > p { max-width: 37ch; margin-top: 20px; color: var(--muted); font-size: clamp(1rem, 1.4vw, 1.15rem); }
.actions { flex-wrap: wrap; gap: 12px 22px; margin-top: 29px; }
.actions a { display: inline-flex; align-items: center; gap: 14px; min-height: 46px; font-weight: 600; }
.launch { padding: 9px 16px; border-radius: 5px; color: var(--deep); background: var(--accent); }
.launch:hover { background: #f6f3cf; }
.play { color: var(--text); }
.play:hover { text-decoration: underline; text-underline-offset: 4px; }
.preview { min-width: 0; }
.preview img {
  width: 100%;
  height: auto;
  border-radius: 7px;
  box-shadow: 0 17px 65px #031e1c83;
}
.preview figcaption { margin-top: 10px; color: var(--muted); font-size: .875rem; text-align: right; }

.reading { border-top: 1px solid var(--line); }
.guide, .faq { padding-block: clamp(34px, 5.5vw, 76px); }
.guide ol {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px clamp(20px, 4vw, 50px);
  margin: 25px 0 0;
  padding-left: 1.3em;
}
.guide li::marker { color: var(--accent); }
.guide h3 { margin-bottom: 6px; font-size: 1.05rem; }
.guide p, details p { color: var(--muted); }
.faq { display: grid; grid-template-columns: minmax(0, .8fr) minmax(0, 1.2fr); gap: 24px; border-top: 1px solid var(--line); }
.questions { border-top: 1px solid var(--line); }
details { border-bottom: 1px solid var(--line); }
summary { padding: 15px 2px; cursor: pointer; font-weight: 600; }
summary::marker { color: var(--accent); }
details p { max-width: 66ch; padding: 0 2px 17px; }
.site-footer { display: flex; justify-content: space-between; gap: 12px; padding-block: 23px 34px; border-top: 1px solid var(--line); color: var(--muted); }
.missing { padding-block: 85px; }
.missing p { margin-block: 16px 23px; }

@media (max-width: 760px) {
  .hero, .faq { grid-template-columns: minmax(0, 1fr); }
  .hero { gap: 26px; }
  .hero-copy > p { margin-top: 14px; }
  .actions { margin-top: 20px; }
  .guide ol { grid-template-columns: minmax(0, 1fr); }
  h1, h2 { text-wrap: wrap; }
}

@media (max-width: 410px) {
  .site-header { min-height: 66px; }
  .logo { gap: 8px; }
  .logo img { width: 35px; height: 35px; }
  .guide-link { display: none; }
}