:root{
  --navy:#0e2a47;--red:#e23b30;--orange:#f2691f;--bg:#e7ecf2;--ink:#141f2c;--sub:#5a6a7c;--muted:#93a1b1;--line:#e4eaf1;--shadow:0 18px 50px rgba(15,32,51,.16);
  font-family:-apple-system,BlinkMacSystemFont,"SF Pro Display","PingFang SC","Helvetica Neue","Microsoft YaHei",Arial,sans-serif;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{background:var(--bg);color:var(--ink);-webkit-font-smoothing:antialiased}
a{text-decoration:none;color:inherit}
.prototype-board{max-width:1340px;margin:0 auto;padding:40px 32px 90px}
.board-head{display:flex;align-items:flex-end;justify-content:space-between;gap:24px;flex-wrap:wrap}
.board-head h1{font-size:34px;font-weight:800;letter-spacing:.2px}
.board-head p{margin-top:8px;color:var(--sub);font-size:14px;max-width:650px;line-height:1.7}
.board-head .meta{text-align:right;color:var(--muted);font-size:12.5px;line-height:1.7}
.board-head .meta b{display:block;color:var(--ink);font-size:20px;font-weight:800}
.toc{display:flex;flex-wrap:wrap;gap:8px;margin:26px 0 28px}
.toc a{padding:8px 14px;border-radius:999px;background:#fff;border:1px solid var(--line);color:var(--sub);font-size:13px;font-weight:600;transition:.15s}
.toc a:hover{border-color:var(--navy);color:var(--navy)}
.toc b{color:var(--red);margin-right:6px;font-weight:800}
.phone-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:34px 30px;justify-items:center}
.phone-shot{width:100%;max-width:400px;display:flex;flex-direction:column;gap:14px}
.shot-label{display:flex;align-items:baseline;justify-content:space-between;gap:12px;padding:0 4px}
.shot-label strong{font-size:16px;font-weight:800;display:flex;align-items:center;gap:9px}
.shot-label em{font-style:normal;min-width:26px;height:26px;padding:0 6px;display:grid;place-items:center;border-radius:8px;background:var(--navy);color:#fff;font-size:12px;font-weight:800}
.shot-label span{color:var(--muted);font-size:12px;text-align:right;line-height:1.4}
.phone{position:relative;width:100%;max-width:392px;height:844px;background:#f5f7fa;border:11px solid #14181d;border-radius:46px;box-shadow:var(--shadow),inset 0 0 0 2px #3a424d;overflow:hidden}
.phone::after{content:"";position:absolute;top:11px;left:50%;transform:translateX(-50%);width:118px;height:30px;border-radius:20px;background:#0b0e12;z-index:3;pointer-events:none}
.phone iframe{position:absolute;inset:0;width:100%;height:100%;border:0;background:#f5f7fa}
@media(max-width:1240px){.phone-grid{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media(max-width:820px){.prototype-board{padding:24px 14px 70px}.phone-grid{grid-template-columns:minmax(0,1fr);gap:40px 0}.board-head .meta{text-align:left}.board-head h1{font-size:28px}}