/* 佛跳墙介绍站:沿用客户端的配色与圆角,纯 CSS,无框架 */
:root {
  --bg: #f4f6fa; --surface: #fff; --surface-2: #f7f9fc; --text: #16202e; --muted: #64748b;
  --border: #e3e8ef; --primary: #2f6bff; --primary-2: #1d4ed8; --primary-soft: #eef3ff;
  --ok: #16a34a; --warn: #d97706;
  --g1: #6a44f2; --g2: #2f8bff; --g3: #18e3e8;
  --radius: 15px; --radius-sm: 10px;
  --mono: ui-monospace, SFMono-Regular, Menlo, Consolas, "Cascadia Mono", monospace;
  --shadow: 0 1px 2px rgba(15, 23, 42, .04), 0 10px 26px -14px rgba(15, 23, 42, .18);
  --shadow-lg: 0 30px 70px -34px rgba(15, 23, 42, .5);
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0c1015; --surface: #151a22; --surface-2: #1a2029; --text: #e6eaf1; --muted: #8b95a5;
    --border: #262e3a; --primary: #5b8dff; --primary-2: #7ea6ff; --primary-soft: #17233a;
    --shadow: 0 1px 2px rgba(0, 0, 0, .5), 0 14px 34px -18px rgba(0, 0, 0, .7);
    --shadow-lg: 0 34px 80px -40px rgba(0, 0, 0, .9);
  }
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; background: var(--bg); color: var(--text); font: 16px/1.68 -apple-system, BlinkMacSystemFont, "Segoe UI Variable", "Segoe UI", "PingFang SC", "Microsoft YaHei UI", system-ui, sans-serif; -webkit-font-smoothing: antialiased; }
a { color: var(--primary); text-decoration: none; }
a:hover { text-decoration: underline; }
img { max-width: 100%; height: auto; }
code, pre { font-family: var(--mono); font-size: .9em; }
pre { background: var(--surface-2); border: 1px solid var(--border); border-radius: var(--radius-sm); padding: .9rem 1rem; overflow-x: auto; margin: .9rem 0; }
:not(pre) > code { background: var(--surface-2); border: 1px solid var(--border); border-radius: 5px; padding: .05rem .35rem; }
.wrap { max-width: 1080px; margin: 0 auto; padding: 0 1.2rem; }
.muted { color: var(--muted); }
.small { font-size: .86rem; }
.grad { background: linear-gradient(110deg, var(--g1), var(--g2) 55%, var(--g3)); -webkit-background-clip: text; background-clip: text; color: transparent; }

/* 顶栏 */
.top { position: sticky; top: 0; z-index: 10; background: color-mix(in srgb, var(--bg) 86%, transparent); backdrop-filter: blur(10px); border-bottom: 1px solid var(--border); }
.bar { display: flex; align-items: center; gap: 1rem; height: 60px; }
.brand { display: inline-flex; align-items: center; gap: .55rem; font-weight: 700; color: var(--text); }
.brand svg, .brand img { width: 28px; height: 28px; display: block; }
.brand small { font-weight: 500; color: var(--muted); font-size: .78rem; padding-left: .5rem; border-left: 1px solid var(--border); }
.nav { display: flex; gap: .2rem; flex: 1; margin-left: .6rem; overflow-x: auto; scrollbar-width: none; }
.nav::-webkit-scrollbar { display: none; }
.nav a { color: var(--muted); padding: .4rem .65rem; border-radius: 8px; white-space: nowrap; font-size: .95rem; }
.nav a:hover { color: var(--text); background: var(--surface-2); text-decoration: none; }
.nav a[aria-current="page"] { color: var(--primary); background: var(--primary-soft); }
.right { display: flex; gap: .5rem; align-items: center; flex: none; }
.right a { white-space: nowrap; font-size: .92rem; flex: none; }
.gh { color: var(--muted); padding: .4rem .5rem; }
.cta, .btn { white-space: nowrap; display: inline-flex; align-items: center; gap: .45rem; background: linear-gradient(115deg, var(--g1), var(--g2) 62%, var(--g3)); color: #fff !important; padding: .55rem 1.1rem; border-radius: var(--radius-sm); font-weight: 600; box-shadow: 0 8px 20px -10px rgba(47, 139, 255, .8); transition: transform .12s, filter .12s; }
.cta:hover, .btn:hover { filter: brightness(1.07); transform: translateY(-1px); text-decoration: none; }
.btn.ghost { background: var(--surface); color: var(--text) !important; border: 1px solid var(--border); box-shadow: none; }
.btn.ghost:hover { border-color: var(--primary); color: var(--primary) !important; }
@media (max-width: 800px) { .nav { display: none; } .gh { display: none; } .brand small { display: none; } }

/* 首屏 */
.hero { position: relative; text-align: center; padding: 4.2rem 0 1rem; overflow: hidden; }
.hero::before { content: ""; position: absolute; inset: -80px -30vw auto; height: 460px; background: radial-gradient(58% 60% at 50% 0%, color-mix(in srgb, var(--g2) 18%, transparent), transparent 70%); pointer-events: none; z-index: -1; }
.eyebrow { display: inline-flex; align-items: center; gap: .45rem; font-size: .78rem; font-weight: 600; letter-spacing: .04em; color: var(--primary); background: var(--primary-soft); border: 1px solid color-mix(in srgb, var(--primary) 26%, transparent); border-radius: 999px; padding: .3rem .85rem; margin-bottom: 1.1rem; }
.hero h1 { font-size: clamp(2.1rem, 5.4vw, 3.35rem); margin: 0 0 .75rem; letter-spacing: -.028em; line-height: 1.14; }
.hero .lead { font-size: 1.13rem; color: var(--muted); max-width: 44rem; margin: 0 auto 1.6rem; }
.hero .actions { display: flex; gap: .7rem; justify-content: center; flex-wrap: wrap; }
.proof { display: flex; flex-wrap: wrap; justify-content: center; gap: .4rem 1.3rem; margin: 1.3rem 0 0; color: var(--muted); font-size: .86rem; }
.proof span::before { content: "✓"; color: var(--ok); margin-right: .35rem; font-weight: 700; }

/* 手机形状的截图:一大两小,中间那张抬起来 */
.showcase { display: flex; justify-content: center; align-items: flex-end; gap: 1.6rem; padding: 2.6rem 1.2rem 0; }
.shot { border: 1px solid var(--border); border-radius: 20px; overflow: hidden; background: var(--surface); box-shadow: var(--shadow-lg); flex: none; }
.shot img { display: block; width: 100%; }
.showcase .shot { width: 236px; }
.showcase .shot.lead-shot { width: 286px; margin-bottom: 2.2rem; }
@media (max-width: 900px) {
  .showcase { gap: 1rem; padding-top: 2rem; }
  .showcase .shot { width: 30%; } .showcase .shot.lead-shot { width: 34%; margin-bottom: 1rem; }
}
@media (max-width: 560px) {
  .showcase { flex-wrap: wrap; }
  .showcase .shot { display: none; } .showcase .shot.lead-shot { display: block; width: 260px; margin-bottom: 0; }
}

/* 区块 */
section.block { padding: 3rem 0; border-top: 1px solid var(--border); }
section.block h2 { font-size: 1.7rem; margin: 0 0 .45rem; letter-spacing: -.018em; }
section.block > p.sub { color: var(--muted); margin: 0 0 1.6rem; max-width: 46rem; }
.grid { display: grid; gap: 1rem; grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); }
.card { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 1.25rem 1.3rem; box-shadow: var(--shadow); transition: transform .15s, border-color .15s; }
.card:hover { transform: translateY(-2px); border-color: color-mix(in srgb, var(--primary) 35%, var(--border)); }
.card .ic { width: 38px; height: 38px; border-radius: 11px; background: var(--primary-soft); color: var(--primary); display: grid; place-items: center; margin-bottom: .75rem; }
.card .ic svg { width: 20px; height: 20px; fill: none; stroke: currentColor; stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round; }
.card h3 { margin: 0 0 .35rem; font-size: 1.04rem; }
.card p { margin: 0; color: var(--muted); font-size: .95rem; }
.card .tag { display: inline-block; font-size: .74rem; font-weight: 600; color: var(--muted); background: var(--surface-2); border: 1px solid var(--border); border-radius: 999px; padding: .1rem .55rem; margin-left: .4rem; vertical-align: 2px; }

/* 平台下载卡 */
.plats { display: grid; gap: 1rem; grid-template-columns: repeat(auto-fit, minmax(230px, 1fr)); }
.plat { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 1.2rem 1.3rem; box-shadow: var(--shadow); display: flex; flex-direction: column; }
.plat h3 { margin: 0 0 .15rem; font-size: 1.05rem; }
.plat .req { color: var(--muted); font-size: .84rem; margin: 0 0 .8rem; }
.plat p { color: var(--muted); font-size: .92rem; margin: 0 0 1rem; }
.plat pre { font-size: .78rem; margin: 0 0 1rem; }
.plat .go { margin-top: auto; }

.ctaband { text-align: center; background: linear-gradient(135deg, var(--primary-soft), var(--surface)); border: 1px solid var(--border); border-radius: var(--radius); padding: 2.4rem 1.2rem; margin: 3rem 0 0; box-shadow: var(--shadow); }
.ctaband h2 { margin: 0 0 .5rem; font-size: 1.6rem; }
.ctaband p { color: var(--muted); margin: 0 0 1.2rem; }

/* 文档页:左边目录常驻,右边正文 */
.docs { display: grid; grid-template-columns: 216px minmax(0, 1fr); gap: 2.6rem; padding: 2.2rem 0 3.5rem; align-items: start; }
.side { position: sticky; top: 76px; font-size: .92rem; }
.side strong { display: block; font-size: .74rem; letter-spacing: .06em; text-transform: uppercase; color: var(--muted); margin: 1.1rem 0 .4rem; }
.side strong:first-child { margin-top: 0; }
.side a { display: block; color: var(--muted); padding: .28rem .6rem; border-radius: 7px; border-left: 2px solid transparent; }
.side a:hover { color: var(--text); background: var(--surface-2); text-decoration: none; }
.side a.on { color: var(--primary); border-left-color: var(--primary); background: var(--primary-soft); }
article.doc { max-width: 760px; }
article.doc > h1 { font-size: 2.05rem; letter-spacing: -.022em; margin: 0 0 .4rem; line-height: 1.2; }
article.doc > p.lead { color: var(--muted); font-size: 1.08rem; margin: 0 0 2rem; }
article.doc h2 { font-size: 1.35rem; margin: 2.6rem 0 .6rem; padding-top: 1.2rem; border-top: 1px solid var(--border); scroll-margin-top: 80px; }
article.doc h2:first-of-type { border-top: 0; padding-top: 0; margin-top: 0; }
article.doc h3 { font-size: 1.05rem; margin: 1.6rem 0 .35rem; }
article.doc ul { padding-left: 1.2rem; }
article.doc li { margin: .25rem 0; }
article.doc table { width: 100%; border-collapse: collapse; font-size: .93rem; margin: 1rem 0; }
article.doc th, article.doc td { text-align: left; padding: .55rem .6rem; border-bottom: 1px solid var(--border); vertical-align: top; }
article.doc th { color: var(--muted); font-weight: 600; font-size: .8rem; letter-spacing: .03em; text-transform: uppercase; }
.note { background: var(--primary-soft); border: 1px solid color-mix(in srgb, var(--primary) 20%, var(--border)); border-radius: var(--radius-sm); padding: .75rem 1rem; margin: 1.1rem 0; font-size: .94rem; }
.note b { color: var(--text); }
.copy { position: relative; }
.copy pre { padding-top: 2.4rem; } /* 首行让到复制键下面,长命令横向滚动时也不会钻到按钮底下 */
.copy button { position: absolute; top: .55rem; right: .55rem; border: 1px solid var(--border); background: var(--surface); color: var(--muted); border-radius: 7px; padding: .18rem .55rem; font-size: .74rem; cursor: pointer; font-family: inherit; }
.copy button:hover { color: var(--primary); border-color: var(--primary); }
@media (max-width: 860px) {
  .docs { grid-template-columns: 1fr; gap: 1.2rem; }
  .side { position: static; display: flex; flex-wrap: wrap; gap: .4rem; }
  .side strong { display: none; }
  .side a { border: 1px solid var(--border); border-left-width: 1px; border-radius: 999px; padding: .18rem .7rem; font-size: .84rem; }
}

/* 演示 */
.demo-wrap { display: flex; justify-content: center; padding: 1.6rem 0 3rem; }
.phone { width: 420px; height: 760px; max-width: 100%; border-radius: 22px; overflow: hidden; border: 1px solid var(--border); box-shadow: var(--shadow-lg); background: var(--surface); }
.phone iframe { width: 100%; height: 100%; border: 0; display: block; }
@media (max-width: 520px) { .phone { height: 640px; } }

/* 页脚 */
.foot { border-top: 1px solid var(--border); padding: 2rem 0 2.6rem; margin-top: 2.5rem; }
.cols { display: flex; justify-content: space-between; gap: 1.5rem; flex-wrap: wrap; }
.cols > div:last-child { display: flex; gap: 1.2rem; flex-wrap: wrap; align-items: center; }
.cols a { color: var(--muted); }
.foot p { margin: .35rem 0 0; }