/* 配色取自 app 图标：夜色底、米白的星、绿色的叶 */
:root {
  --night: #12151C;
  --night-deep: #0E1116;
  --star: #F8EFE4;
  --leaf: #69984F;
  --bg: var(--night);
  --ink: var(--star);
  --muted: #A7A49F;
  --line: #262A33;
  --link: #8DB873;
  --serif: "Songti SC", "STSong", "Noto Serif SC", "Source Han Serif SC", serif;
  --sans: -apple-system, "PingFang SC", "Hiragino Sans GB", "Noto Sans SC", "Microsoft YaHei", sans-serif;
  color-scheme: dark;
}

@media (prefers-color-scheme: light) {
  :root {
    --bg: var(--star);
    --ink: var(--night);
    --muted: #5E5D5A;
    --line: #E2D8CB;
    --link: #4A7336;
    color-scheme: light;
  }
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font: 17px/1.75 var(--sans);
}

a { color: var(--link); text-underline-offset: 0.2em; }
a:focus-visible { outline: 2px solid var(--leaf); outline-offset: 3px; border-radius: 2px; }

.bar, main, footer {
  max-width: 1080px;
  margin: 0 auto;
  padding-inline: 24px;
}

.bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
  font-size: 15px;
}
.bar a { color: var(--ink); text-decoration: none; }
.bar a:hover { text-decoration: underline; }
.brand { display: flex; align-items: center; gap: 10px; font-weight: 600; }
.bar nav { display: flex; gap: 24px; }

/* 首屏：书名竖排在左，像书脊；右边是介绍、下载和截图 */
.hero {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: clamp(20px, 2.5vw, 28px) clamp(28px, 5vw, 72px);
  padding: clamp(16px, 3vw, 32px) 0 clamp(64px, 9vw, 112px);
}

.name {
  grid-row: 1 / span 2;
  margin: 0;
  writing-mode: vertical-rl;
  font: 400 clamp(64px, 8vw, 112px)/1 var(--serif);
  letter-spacing: 0.06em;
}

.pitch { text-wrap: pretty; }
.pitch p { margin: 0 0 1em; color: var(--muted); }
.pitch .lede {
  color: var(--ink);
  font: 400 clamp(24px, 2.3vw, 28px)/1.5 var(--serif);
  margin: 0 0 0.4em;
}
.pitch .req { margin: 12px 0 0; font-size: 14px; }

/* 宽屏上介绍在左、下载在右，把截图让进首屏 */
@media (min-width: 900px) {
  .pitch {
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto;
    column-gap: 40px;
    align-items: end;
  }
  .pitch .lede { grid-column: 1 / -1; }
  .pitch > p:not(.req, .lede) { grid-column: 1; }
  .pitch .get {
    display: grid;
    grid-template-columns: auto auto;
    grid-column: 2;
    grid-row: 2;
    margin: 0;
  }
  .pitch .get-title { grid-column: 1 / -1; }
  .pitch .req { grid-column: 2; }
}

.get {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
  margin: 1.6em 0;
}
.get .get-title { flex-basis: 100%; margin: 0; color: var(--ink); font-weight: 600; }
.version { margin-left: 6px; color: var(--muted); font-weight: 400; }

/* 按钮的圆角取自叶片：对角圆、对角尖 */
.download {
  display: inline-block;
  padding: 12px 28px;
  border-radius: 20px 3px;
  background: var(--leaf);
  color: var(--night);
  font-weight: 600;
  text-decoration: none;
}
.download:hover { background: #77A85B; }
.download.alt {
  background: none;
  color: var(--ink);
  box-shadow: inset 0 0 0 1.5px var(--leaf);
}
.download.alt:hover { background: rgb(105 152 79 / 0.16); }

.shot { margin: 0 0 clamp(64px, 10vw, 128px); }
.hero .shot { grid-column: 2; margin: 0; }
/* 截图按视口高度收窄，矮屏上也整张留在首屏；1.513 是截图的宽高比 */
@media (min-width: 561px) {
  .hero .pitch, .hero .shot { width: clamp(480px, calc((100svh - 350px) * 1.513), 100%); }
}
/* 截图是带圆角的窗口，JPEG 的角是黑的，用圆角裁掉；底色是截图的主色，图片加载前先占位 */
.shot img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: 1.1% / 1.66%;
  background: #4A2823;
  box-shadow: 0 0 0 1px var(--line);
}
.shot figcaption { margin-top: 14px; color: var(--muted); font-size: 14px; }

/* 下半页：标题在左栏，内容在右栏 */
.group, .download-info, .source {
  display: grid;
  grid-template-columns: 8em minmax(0, 36em);
  gap: 0 clamp(24px, 5vw, 64px);
  margin-bottom: clamp(48px, 7vw, 80px);
}
.group > *, .download-info > *, .source > * { grid-column: 2; }
.group h3, .download-info h2, .source h2 {
  grid-column: 1;
  grid-row: 1 / span 9;
  margin: 0;
  font: 400 24px/1.6 var(--serif);
}
.download-info h2, .source h2 { font-size: 30px; line-height: 1.3; }
.group ul { margin: 0; padding: 0; list-style: none; }
.group li + li { margin-top: 0.6em; }
.download-info p, .source p { margin: 0 0 1em; }
.source p:last-child { color: var(--muted); }
.features .shot { margin-top: clamp(16px, 3vw, 32px); }

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip-path: inset(50%);
  white-space: nowrap;
}

footer {
  display: flex;
  align-items: center;
  gap: 10px;
  padding-top: 28px;
  padding-bottom: 48px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 14px;
}
footer p { margin: 0; }

@media (max-width: 560px) {
  body { font-size: 16px; }
  .bar, main, footer { padding-inline: 16px; }
  .hero { gap: 28px 20px; }
  .name { grid-row: 1; font-size: 60px; }
  .hero .shot { grid-column: 1 / -1; }
  .shot img { border-radius: 8px; }
  .download { padding-inline: 20px; }
  .group, .download-info, .source { grid-template-columns: minmax(0, 1fr); }
  .group h3, .download-info h2, .source h2 { grid-column: 1; grid-row: auto; margin-bottom: 0.4em; }
  .group > *, .download-info > *, .source > * { grid-column: 1; }
}