:root{
  --bg:#0c0d10; --bg-2:#12141a; --panel:#15171d; --panel-2:#1b1e26; --line:#2a2f39;
  --text:#edeff3; --muted:#98a0ad; --gold:#c9a227; --gold-2:#e3c766; --ok:#43d19a;
  --radius:14px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;background:var(--bg);color:var(--text);
  font:15px/1.6 -apple-system,BlinkMacSystemFont,"Segoe UI",Inter,"Helvetica Neue",Arial,sans-serif;
  -webkit-font-smoothing:antialiased;
}
img{display:block;max-width:100%}
a{color:inherit;text-decoration:none}
.wrap{max-width:1240px;margin:0 auto;padding:0 24px}

/* ---------- header ---------- */
.site-header{position:sticky;top:0;z-index:30;background:rgba(12,13,16,.86);backdrop-filter:blur(14px);border-bottom:1px solid var(--line)}
.site-header .wrap{display:flex;align-items:center;justify-content:space-between;height:66px;gap:24px}
.logo{display:flex;align-items:center;gap:11px;font-size:13px;letter-spacing:.22em;text-transform:uppercase;font-weight:600}
.logo .mark{width:24px;height:24px;border:1.5px solid var(--gold);border-radius:50%;position:relative;flex:0 0 auto}
.logo .mark::before{content:"";position:absolute;left:50%;top:50%;width:1.5px;height:8px;background:var(--gold);transform:translate(-50%,-100%) rotate(34deg);transform-origin:bottom center}
.logo .mark::after{content:"";position:absolute;inset:-4px;border:1px solid rgba(201,162,39,.25);border-radius:50%}
.nav{display:flex;gap:26px;font-size:13px;color:var(--muted)}
.nav a:hover{color:var(--text)}
.nav a[aria-current="page"]{color:var(--text)}
.header-tools{display:flex;align-items:center;gap:18px;font-size:13px;color:var(--muted)}
.cart-pill{border:1px solid var(--line);border-radius:999px;padding:7px 14px;display:flex;gap:8px;align-items:center}
.cart-pill b{color:var(--text);font-weight:600}
@media(max-width:860px){.nav{display:none}.header-tools .lang{display:none}}

/* ---------- hero ---------- */
.hero{padding:46px 0 26px;border-bottom:1px solid var(--line);
  background:radial-gradient(90% 130% at 12% -10%,#1b1f27 0%,transparent 60%)}
.hero .eyebrow{font-size:11px;letter-spacing:.26em;text-transform:uppercase;color:var(--gold-2);margin:0 0 12px}
.hero h1{font-size:36px;line-height:1.18;margin:0 0 10px;font-weight:600;letter-spacing:-.01em}
.hero p{margin:0;color:var(--muted);font-size:14px;max-width:620px}
@media(max-width:600px){.hero h1{font-size:27px}}

/* ---------- layout ---------- */
.builder{display:grid;grid-template-columns:minmax(0,1fr) 452px;gap:34px;padding:30px 0 40px;align-items:start}
.builder > *{min-width:0}
@media(max-width:1020px){.builder{grid-template-columns:minmax(0,1fr);gap:22px}}

/* ---------- preview ---------- */
.stage{position:sticky;top:88px;background:linear-gradient(180deg,#15181f 0%,#0f1116 100%);
  border:1px solid var(--line);border-radius:var(--radius);padding:22px;overflow:hidden}
.stage::after{content:"";position:absolute;inset:0;pointer-events:none;
  background:radial-gradient(60% 40% at 50% 8%,rgba(255,255,255,.05),transparent 70%)}
.frames{position:relative;width:100%;aspect-ratio:800/1120;max-height:66vh;margin:0 auto}
.frames img{position:absolute;inset:0;width:100%;height:100%;object-fit:contain;transition:opacity .16s ease}
.frames img.layer-out{opacity:0}
.stage-meta{display:flex;justify-content:space-between;align-items:center;gap:12px;
  margin-top:14px;padding-top:14px;border-top:1px solid var(--line);font-size:12px;color:var(--muted)}
.live{display:inline-flex;align-items:center;gap:7px}
.live i{width:6px;height:6px;border-radius:50%;background:var(--ok);box-shadow:0 0 0 3px rgba(67,209,154,.14)}
@media(max-width:1020px){.stage{position:static}.frames{max-height:none}}

/* 规格条 */
.spec{display:grid;grid-template-columns:1fr 1fr;gap:10px 18px;margin:0;padding:14px 0 0;border-top:1px solid var(--line)}
.spec > div{display:flex;justify-content:space-between;gap:10px;font-size:12px}
.spec dt{color:var(--muted);margin:0}
.spec dd{margin:0;color:var(--text);text-align:right}

/* ---------- config panel ---------- */
.panel{display:flex;flex-direction:column;gap:12px}
.panel-lead{display:flex;align-items:baseline;justify-content:space-between;gap:14px;margin-bottom:2px}
.panel-lead h2{font-size:17px;margin:0;font-weight:600}
.panel-lead span{font-size:13px;color:var(--muted)}
.group{background:var(--panel);border:1px solid var(--line);border-radius:12px;padding:13px 15px 15px}
.group-head{display:flex;align-items:baseline;justify-content:space-between;gap:10px;margin-bottom:10px}
.group-head h3{margin:0;font-size:11px;letter-spacing:.16em;text-transform:uppercase;color:var(--muted);font-weight:600}
.group-head em{font-style:normal;font-size:12px;color:var(--gold-2)}
.chips{display:grid;grid-template-columns:1fr 1fr;gap:8px}
@media(max-width:520px){.chips{grid-template-columns:1fr}}
.chip{display:flex;align-items:center;gap:9px;width:100%;cursor:pointer;
  background:var(--panel-2);border:1px solid var(--line);border-radius:10px;padding:9px 10px;
  color:var(--text);font:inherit;font-size:13px;text-align:left;transition:border-color .14s,background .14s,transform .06s}
.chip:hover{border-color:#3b4250}
.chip:active{transform:scale(.995)}
.chip .sw{width:15px;height:15px;border-radius:50%;flex:0 0 auto;border:1px solid rgba(255,255,255,.22);box-shadow:inset 0 0 0 1px rgba(0,0,0,.25)}
.chip .nm{flex:1;min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.chip .pp{font-size:12px;color:var(--muted);white-space:nowrap}
.chip[aria-checked="true"]{border-color:var(--gold);background:#211f18;box-shadow:0 0 0 1px rgba(201,162,39,.25) inset}
.chip[aria-checked="true"] .pp{color:var(--gold-2)}

/* ---------- summary ---------- */
.summary{position:relative;background:var(--panel);border:1px solid var(--line);border-radius:12px;padding:15px 16px}
.summary h3{margin:0 0 11px;font-size:11px;letter-spacing:.16em;text-transform:uppercase;color:var(--muted);font-weight:600}
.rows{display:flex;flex-direction:column;gap:7px;font-size:13px}
.row{display:flex;justify-content:space-between;gap:14px}
.row .k{color:var(--muted);flex:0 0 auto}
.row .v{text-align:right}
.row .v b{color:var(--gold-2);font-weight:500;margin-left:5px}
.total{display:flex;align-items:baseline;justify-content:space-between;gap:12px;
  margin-top:13px;padding-top:13px;border-top:1px solid var(--line)}
.total .lbl{font-size:13px;color:var(--muted)}
.total .amt{font-size:28px;font-weight:600;letter-spacing:-.01em}
.total .amt small{font-size:12px;color:var(--muted);font-weight:400;margin-left:6px}
.actions{display:grid;grid-template-columns:1fr 1fr;gap:9px;margin-top:12px}
.btn{appearance:none;border-radius:10px;padding:12px 14px;border:1px solid var(--line);background:transparent;
  color:var(--text);font:inherit;font-size:14px;font-weight:600;cursor:pointer;transition:.15s}
.btn:hover{border-color:#3b4250;background:#1b1e26}
.btn.primary{grid-column:1/-1;background:var(--gold);border-color:var(--gold);color:#121212}
.btn.primary:hover{background:var(--gold-2);border-color:var(--gold-2)}
.btn:disabled{opacity:.6;cursor:default}
.hint{margin:10px 2px 0;font-size:12px;color:var(--muted);line-height:1.5}

/* ---------- info blocks ---------- */
.info{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;padding:8px 0 54px;border-top:1px solid var(--line);margin-top:12px}
@media(max-width:860px){.info{grid-template-columns:1fr}}
.info .card{background:var(--panel);border:1px solid var(--line);border-radius:12px;padding:18px}
.info h4{margin:0 0 6px;font-size:14px;font-weight:600}
.info p{margin:0;font-size:13px;color:var(--muted)}

/* ---------- footer ---------- */
.site-footer{border-top:1px solid var(--line);padding:26px 0 34px;color:var(--muted);font-size:12px}
.site-footer .wrap{display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap}

/* ---------- toast ---------- */
.toast{position:fixed;left:50%;bottom:26px;transform:translate(-50%,16px);z-index:60;
  background:#20242d;border:1px solid var(--line);color:var(--text);padding:11px 17px;border-radius:10px;
  font-size:13px;opacity:0;pointer-events:none;transition:.2s}
.toast.on{opacity:1;transform:translate(-50%,0)}