:root {
  --paper: #f4f1ea;
  --paper-2: #eae4d7;
  --paper-3: #e2dbcb;
  --ink: #17191e;
  --ink-2: #3d3f46;
  --ink-soft: #6c6a63;
  --teal: #0e6f66;
  --line: #ccc5b5;
  --line-strong: #17191e;
  --display: "Songti SC", "STSong", Georgia, "Times New Roman", serif;
  --sans: -apple-system, "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
  --mono: ui-monospace, "SFMono-Regular", Menlo, Consolas, monospace;
}
* { margin: 0; padding: 0; box-sizing: border-box; }
body { background: var(--paper); color: var(--ink); font-family: var(--sans); font-size: 15px; line-height: 1.8; -webkit-font-smoothing: antialiased; }
a { color: inherit; text-decoration: none; }
.wrap { max-width: 1180px; margin: 0 auto; padding: 0 40px; }

html:not(.zh) .lang-zh { display: none !important; }
html.zh .lang-en { display: none !important; }

/* ---------- masthead ---------- */
header { position: sticky; top: 0; z-index: 60; background: var(--paper); border-bottom: 2px solid var(--line-strong); }
.masthead { display: flex; align-items: center; justify-content: space-between; gap: 24px; height: 74px; }
.brand { display: flex; align-items: baseline; gap: 12px; }
.brand .en { font-family: var(--display); font-size: 23px; letter-spacing: .06em; }
.brand .zh { font-family: var(--display); font-size: 14px; letter-spacing: .28em; color: var(--ink-soft); }
.m-right { display: flex; align-items: center; gap: 26px; }
.back { font-family: var(--mono); font-size: 11.5px; letter-spacing: .16em; text-transform: uppercase; color: var(--ink-2); border-bottom: 1px solid transparent; transition: color .2s, border-color .2s; }
.back:hover { color: var(--teal); border-bottom-color: var(--teal); }
.lang-btn {
  font-family: var(--mono); font-size: 11.5px; letter-spacing: .14em; text-transform: uppercase;
  padding: 7px 14px; border: 1.5px solid var(--line-strong); background: transparent; color: var(--ink);
  cursor: pointer; transition: background .2s, color .2s;
}
.lang-btn:hover { background: var(--ink); color: var(--paper); }

/* ---------- record header ---------- */
.record { padding: 52px 0 0; }
.rec-head {
  display: grid; grid-template-columns: 88px 1fr auto; gap: 28px; align-items: end;
  padding-bottom: 20px; border-bottom: 2px solid var(--line-strong);
}
.rec-head .num { font-family: var(--display); font-size: 52px; line-height: 1; color: var(--teal); }
.rec-head .t .k { font-family: var(--mono); font-size: 11px; letter-spacing: .22em; text-transform: uppercase; color: var(--ink-soft); }
.rec-head h1 { font-family: var(--display); font-weight: 500; font-size: clamp(28px, 4.2vw, 44px); letter-spacing: .02em; margin-top: 6px; }
.rec-head .p { text-align: right; }
.rec-head .p .price { font-family: var(--display); font-size: 38px; font-variant-numeric: tabular-nums; line-height: 1.2; }
.rec-head .p .unit { display: block; font-size: 12.5px; color: var(--ink-soft); }
.stock {
  display: inline-block; margin-top: 8px;
  font-family: var(--mono); font-size: 10.5px; letter-spacing: .14em; text-transform: uppercase;
  border: 1px solid var(--ink); padding: 3px 10px;
}
.stock.pre { border-color: var(--teal); color: var(--teal); }

/* ---------- body grid ---------- */
.rec-body { display: grid; grid-template-columns: 1.25fr 1fr; gap: 60px; padding: 46px 0 20px; align-items: start; }
.fig-main {
  aspect-ratio: 4 / 3; background: var(--paper-2); border: 1px solid var(--line);
  display: flex; align-items: center; justify-content: center; padding: 26px;
}
.fig-main img { width: 86%; height: 86%; object-fit: contain; mix-blend-mode: multiply; }
.fig-note { margin-top: 12px; font-size: 12.5px; color: var(--ink-soft); }

.specs { margin-top: 34px; border-top: 2px solid var(--line-strong); }
.specs .row { display: grid; grid-template-columns: 160px 1fr; gap: 20px; padding: 12px 2px; border-bottom: 1px solid var(--line); font-size: 14px; }
.specs .row .k { font-family: var(--mono); font-size: 10.5px; letter-spacing: .16em; text-transform: uppercase; color: var(--ink-soft); padding-top: 4px; }
.tagline { margin-top: 20px; font-family: var(--mono); font-size: 11px; letter-spacing: .14em; text-transform: uppercase; color: var(--ink-soft); }
.tagline i { font-style: normal; color: var(--line); margin: 0 8px; }

.panel { position: sticky; top: 100px; }
.panel .desc { font-size: 15px; color: var(--ink-2); }
.blk { margin-top: 30px; }
.blk h2 { font-family: var(--mono); font-size: 11px; letter-spacing: .22em; text-transform: uppercase; color: var(--teal); padding-bottom: 9px; border-bottom: 1px solid var(--line); margin-bottom: 12px; }
.blk ul { list-style: none; }
.blk ul li { position: relative; padding: 4px 0 4px 20px; font-size: 14.5px; }
.blk ul li::before { content: "—"; position: absolute; left: 0; color: var(--teal); }
.cta {
  display: block; text-align: center; margin-top: 32px; padding: 16px 22px;
  background: var(--ink); color: var(--paper);
  font-family: var(--mono); font-size: 12px; letter-spacing: .18em; text-transform: uppercase;
  border: 2px solid var(--ink); transition: background .2s, color .2s;
}
.cta:hover { background: transparent; color: var(--ink); }
.alt { display: block; text-align: center; margin-top: 12px; font-family: var(--mono); font-size: 11px; letter-spacing: .16em; text-transform: uppercase; color: var(--ink-soft); }
.alt:hover { color: var(--teal); }
.fine { margin-top: 16px; font-size: 12.5px; color: var(--ink-soft); text-align: center; }

/* ---------- order steps ---------- */
.how { margin-top: 34px; padding: 46px 0 70px; border-top: 2px solid var(--line-strong); }
.how .h-title { font-family: var(--mono); font-size: 11px; letter-spacing: .22em; text-transform: uppercase; color: var(--ink-soft); margin-bottom: 26px; }
.steps { display: grid; grid-template-columns: repeat(3, 1fr); }
.step { padding: 0 34px; border-left: 1px solid var(--line); }
.step:first-child { padding-left: 0; border-left: 0; }
.step:last-child { padding-right: 0; }
.step .s-n { font-family: var(--display); font-size: 34px; line-height: 1; color: var(--teal); }
.step p { margin-top: 10px; font-size: 14px; color: var(--ink-2); }
.step p b { color: var(--ink); font-weight: 600; word-break: break-all; }

footer { border-top: 2px solid var(--line-strong); padding: 28px 0 44px; }
.foot { display: flex; justify-content: space-between; gap: 20px; flex-wrap: wrap; font-family: var(--mono); font-size: 11.5px; letter-spacing: .12em; text-transform: uppercase; color: var(--ink-soft); }
.foot a { color: var(--ink); }
.foot a:hover { color: var(--teal); }

@media (max-width: 900px) {
  .wrap { padding: 0 24px; }
  .rec-head { grid-template-columns: 56px 1fr; gap: 16px; }
  .rec-head .p { grid-column: 1 / -1; text-align: left; }
  .rec-body { grid-template-columns: 1fr; gap: 34px; padding-top: 32px; }
  .panel { position: static; }
  .steps { grid-template-columns: 1fr; }
  .step { padding: 20px 0; border-left: 0; border-top: 1px solid var(--line); }
  .step:first-child { border-top: 0; padding-top: 0; }
}