/* 赤兔马官网样式。字体自托管（Google Fonts 在国内打不开）；中文用系统字体。 */
@font-face { font-family: "Outfit"; src: url("fonts/Outfit-Regular.ttf") format("truetype"); font-weight: 400; font-display: swap; }
@font-face { font-family: "Outfit"; src: url("fonts/Outfit-SemiBold.ttf") format("truetype"); font-weight: 600 700; font-display: swap; }
@font-face { font-family: "IBM Plex Mono"; src: url("fonts/IBMPlexMono-Regular.ttf") format("truetype"); font-weight: 400; font-display: swap; }

:root {
  --red: #D8342A;
  --red-dark: #B02A22;
  --red-deep: #8C211B;
  --red-soft: #FBEAE8;
  --ink: #17181A;
  --ink-2: #4A4D52;
  --ink-3: #5C6066;
  --line: #E6E3DF;
  --line-2: #CFCAC4;
  --ground: #FFFFFF;
  --soft: #F6F4F1;
  --sans: "Outfit", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", system-ui, sans-serif;
  --mono: "IBM Plex Mono", ui-monospace, Menlo, Consolas, monospace;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; background: var(--ground); color: var(--ink); font-family: var(--sans); -webkit-font-smoothing: antialiased; }
img { max-width: 100%; }
a { color: var(--red-dark); }
a:hover { color: var(--red-deep); }
h1, h2, h3 { font-weight: 700; }
.mono { font-family: var(--mono); }
.wrap { max-width: 1200px; margin: 0 auto; padding: 0 24px; }
.muted { color: var(--ink-2); }

/* 顶栏 */
.topbar { border-bottom: 1px solid var(--line); background: var(--ground); }
.topbar .wrap { height: 72px; display: flex; align-items: center; justify-content: space-between; gap: 24px; }
.brand { display: flex; align-items: center; gap: 12px; color: var(--ink); text-decoration: none; }
.brand:hover { color: var(--ink); }
.brand img { height: 32px; width: auto; }
.brand .zh { font-weight: 700; font-size: 20px; letter-spacing: 0.02em; }
.brand .en { font-weight: 600; font-size: 16px; color: var(--ink-2); }
.nav { display: flex; align-items: center; gap: 32px; font-size: 15px; }
.nav a, .footlinks a { color: var(--ink-2); text-decoration: none; }
.nav a:hover, .footlinks a:hover { color: var(--ink); }

/* 按钮 */
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 10px; min-height: 48px; padding: 12px 22px; border-radius: 8px; font-size: 16px; font-weight: 500; text-decoration: none; border: 1px solid transparent; cursor: pointer; font-family: inherit; }
.btn svg { width: 18px; height: 18px; flex: none; }
.btn-primary { background: var(--red); color: #FFFFFF; border-color: var(--red); }
.btn-primary:hover { background: var(--red-dark); border-color: var(--red-dark); color: #FFFFFF; }
.btn-ghost { background: var(--ground); color: var(--ink); border-color: var(--line-2); }
.btn-ghost:hover { background: var(--soft); color: var(--ink); }
.btn-sm { min-height: 44px; padding: 10px 18px; font-size: 15px; }
.btn-block { display: flex; width: 100%; min-height: 52px; }

/* 首屏 */
.hero { padding: 88px 0 72px; }
.hero .wrap { display: grid; grid-template-columns: minmax(0, 5fr) minmax(0, 6fr); gap: 56px; align-items: center; }
.hero-text { display: flex; flex-direction: column; gap: 24px; }
.eyebrow { font-size: 14px; color: var(--ink-2); display: flex; gap: 8px; align-items: center; }
.dot { width: 8px; height: 8px; border-radius: 4px; background: var(--red); display: inline-block; }
.hero h1 { margin: 0; font-size: 52px; line-height: 1.15; letter-spacing: -0.01em; }
.lead { margin: 0; font-size: 18px; line-height: 1.7; color: var(--ink-2); max-width: 520px; }
.actions { display: flex; flex-wrap: wrap; gap: 12px; padding-top: 8px; }
.fine { font-size: 14px; color: var(--ink-3); }

.window { margin: 0; border: 1px solid var(--line); border-radius: 12px; background: var(--ground); box-shadow: 0 24px 48px -24px rgba(23, 24, 26, 0.25); overflow: hidden; }
.window-bar { height: 36px; background: var(--soft); border-bottom: 1px solid var(--line); display: flex; align-items: center; gap: 8px; padding: 0 14px; font-size: 12px; color: var(--ink-3); }
.window-bar i { width: 11px; height: 11px; border-radius: 6px; background: #D9D5D0; display: inline-block; }
.window-bar span { margin-left: 12px; }
.window-body { padding: 20px 22px 16px; display: flex; flex-direction: column; gap: 10px; }
.window-meta { display: flex; justify-content: space-between; font-size: 12px; color: var(--ink-3); font-family: var(--mono); }
.window svg { width: 100%; height: auto; display: block; }
.window img.shot { width: 100%; display: block; }

/* 仪器条 */
.band { background: var(--soft); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); padding: 40px 0; }
.band .wrap { display: flex; flex-wrap: wrap; align-items: center; gap: 16px 40px; }
.band-label { font-size: 14px; color: var(--ink-2); font-weight: 500; }
.instruments { display: flex; flex-wrap: wrap; gap: 12px 32px; font-weight: 600; font-size: 18px; color: #2E3034; margin: 0; padding: 0; list-style: none; }

/* 区块 */
.section { padding: 96px 0; }
.section-head { display: flex; flex-direction: column; gap: 12px; max-width: 640px; margin-bottom: 48px; }
.section h2 { margin: 0; font-size: 36px; }
.section-head p { margin: 0; font-size: 17px; line-height: 1.7; color: var(--ink-2); }

.cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 20px; }
.card { border: 1px solid var(--line); border-radius: 12px; padding: 28px; display: flex; flex-direction: column; gap: 14px; background: var(--ground); }
.card h3 { margin: 0; font-size: 19px; }
.card p { margin: 0; font-size: 15px; line-height: 1.7; color: var(--ink-2); }
.icon-tile { width: 44px; height: 44px; border-radius: 10px; background: var(--red-soft); color: var(--red); display: flex; align-items: center; justify-content: center; }
.icon-tile svg { width: 22px; height: 22px; }

.dark { background: var(--ink); color: #FFFFFF; padding: 88px 0; }
.dark h2 { margin: 0 0 40px; font-size: 32px; }
.flow { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: repeat(5, minmax(0, 1fr)); gap: 16px; }
.flow li { border-top: 2px solid var(--red); padding-top: 18px; display: flex; flex-direction: column; gap: 8px; }
.flow .n { font-family: var(--mono); font-size: 13px; color: #B8BBC0; }
.flow .t { font-size: 18px; font-weight: 700; }
.flow .d { font-size: 14px; line-height: 1.6; color: #C9CCD1; }

.split { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 56px; align-items: start; }
.split-text { display: flex; flex-direction: column; gap: 16px; }
.split-text p { margin: 0; font-size: 17px; line-height: 1.7; color: var(--ink-2); }
.terms { margin: 0; border-top: 1px solid var(--line); }
.terms div { display: flex; flex-direction: column; gap: 6px; padding: 20px 0; border-bottom: 1px solid var(--line); }
.terms dt { font-weight: 700; font-size: 17px; }
.terms dd { margin: 0; font-size: 15px; line-height: 1.7; color: var(--ink-2); }

/* 下载页 */
.page-head { padding: 72px 0 40px; }
.page-head h1 { margin: 0 0 14px; font-size: 44px; }
.page-meta { display: flex; flex-wrap: wrap; gap: 8px 20px; font-size: 16px; color: var(--ink-2); }
.platforms { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 20px; padding-bottom: 64px; }
.platform { border: 1px solid var(--line); border-radius: 14px; padding: 32px; display: flex; flex-direction: column; gap: 20px; }
.platform.is-recommended { border: 2px solid var(--red); padding: 31px; }
.platform-head { display: flex; justify-content: space-between; align-items: flex-start; gap: 12px; }
.platform h2 { margin: 0 0 6px; font-size: 26px; }
.badge { display: none; font-size: 13px; font-weight: 500; color: var(--red-deep); background: var(--red-soft); padding: 6px 10px; border-radius: 999px; white-space: nowrap; }
.platform.is-recommended .badge { display: inline-block; }
.platform .btn { background: var(--ground); color: var(--ink); border-color: var(--line-2); }
.platform .btn:hover { background: var(--soft); }
.platform.is-recommended .btn { background: var(--red); color: #FFFFFF; border-color: var(--red); }
.platform.is-recommended .btn:hover { background: var(--red-dark); }
.facts { margin: 0; display: grid; grid-template-columns: 72px minmax(0, 1fr); gap: 10px 12px; font-size: 14px; }
.facts dt { color: var(--ink-3); }
.facts dd { margin: 0; overflow-wrap: anywhere; }
.facts .mono { font-size: 13px; }

.steps-band { background: var(--soft); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); padding: 72px 0; }
.steps-head { display: flex; flex-wrap: wrap; justify-content: space-between; align-items: end; gap: 16px; margin-bottom: 32px; }
.steps-head h2 { margin: 0; font-size: 30px; }
.tabs { display: inline-flex; background: var(--ground); border: 1px solid var(--line-2); border-radius: 10px; padding: 4px; gap: 4px; }
.tabs button { border: 0; border-radius: 7px; padding: 10px 18px; min-height: 44px; font-size: 15px; font-family: inherit; background: transparent; color: var(--ink-2); cursor: pointer; }
.tabs button[aria-selected="true"] { background: var(--ink); color: #FFFFFF; }
.steps { list-style: none; margin: 0 0 16px; padding: 0; display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 16px; }
.steps li { background: var(--ground); border: 1px solid var(--line); border-radius: 12px; padding: 24px; display: flex; flex-direction: column; gap: 10px; }
.steps .num { width: 32px; height: 32px; border-radius: 16px; background: var(--ink); color: #FFFFFF; font-family: var(--mono); font-size: 14px; display: flex; align-items: center; justify-content: center; }
.steps .t { font-size: 17px; font-weight: 700; }
.steps .d { font-size: 14px; line-height: 1.7; color: var(--ink-2); }
.note { background: var(--ground); border: 1px solid var(--line); border-radius: 12px; padding: 20px 24px; display: flex; gap: 14px; align-items: flex-start; font-size: 14px; line-height: 1.7; color: var(--ink-2); }
.note svg { width: 22px; height: 22px; flex: none; margin-top: 2px; color: var(--red-dark); }
.note strong { display: block; color: var(--ink); font-size: 15px; margin-bottom: 4px; }
[hidden] { display: none !important; }

.code-label { font-size: 13px; color: var(--ink-3); display: block; margin-bottom: 6px; }
pre.code { margin: 0 0 14px; background: var(--ink); color: #F1EFEC; padding: 14px 16px; border-radius: 8px; font-family: var(--mono); font-size: 13px; overflow-x: auto; }
.table-box { overflow-x: auto; border: 1px solid var(--line); border-radius: 10px; }
.table-box table { width: 100%; border-collapse: collapse; font-size: 14px; min-width: 420px; }
.table-box th { background: var(--soft); text-align: left; padding: 12px 16px; font-weight: 500; color: var(--ink-2); }
.table-box td { padding: 12px 16px; border-top: 1px solid var(--line); }
.section-sm { padding: 72px 0; }
.section-sm h2 { margin: 0 0 14px; font-size: 24px; }
.section-sm p { margin: 0 0 14px; font-size: 15px; line-height: 1.7; color: var(--ink-2); }

/* 页脚 */
.footer { border-top: 1px solid var(--line); background: var(--soft); padding: 40px 0; font-size: 14px; color: var(--ink-2); }
.footer .wrap { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 24px; }
.footer-brand { display: flex; align-items: center; gap: 10px; color: var(--ink); font-weight: 700; margin-bottom: 8px; }
.footer-brand img { height: 22px; width: auto; }
.footer p { margin: 0 0 8px; }
.footer .legal { font-size: 12px; color: var(--ink-3); max-width: 560px; }
.footlinks { display: flex; flex-wrap: wrap; gap: 24px; align-items: flex-start; }

@media (max-width: 860px) {
  .nav { display: none; }
  .hero { padding: 56px 0 48px; }
  .hero .wrap, .split, .platforms { grid-template-columns: minmax(0, 1fr); }
  .hero h1 { font-size: 38px; }
  .page-head h1 { font-size: 36px; }
  .section { padding: 64px 0; }
  .section h2 { font-size: 30px; }
  .flow { grid-template-columns: minmax(0, 1fr); }
}