/* ============================================================
   博泰Ai网络中心 · BTAI Design System v1.0
   AI Studio / Neural Lab 视觉语言
   一套 CSS 同时驱动：首页 / 分类页 / 商品详情 / 下单 / 订单查询
   ============================================================ */

/* ---------- 1. Tokens ---------- */
:root{
  --bg:#06070C;
  --bg-2:#0A0C14;
  --bg-3:#0E111B;
  --surface:rgba(255,255,255,.045);
  --surface-2:rgba(255,255,255,.07);
  --line:rgba(255,255,255,.09);
  --line-2:rgba(255,255,255,.14);
  --text:#EEF1FA;
  --text-2:#B9C0D4;
  --muted:#8B94AB;
  --dim:#666F85;
  --violet:#7C5CFF;
  --violet-2:#A78BFF;
  --cyan:#00E5D0;
  --pink:#FF4D9D;
  --amber:#FFB84D;
  --red:#FF5C6C;
  --green:#2BE38B;
  --grad:linear-gradient(135deg,#7C5CFF 0%,#00E5D0 100%);
  --grad-soft:linear-gradient(135deg,rgba(124,92,255,.18),rgba(0,229,208,.12));
  --radius:22px;
  --radius-sm:14px;
  --radius-xs:10px;
  --shadow:0 24px 60px rgba(0,0,0,.55);
  --shadow-sm:0 10px 30px rgba(0,0,0,.35);
  --glow:0 0 0 1px rgba(124,92,255,.35),0 18px 50px rgba(124,92,255,.28);
  --ff:"Inter","SF Pro Display",-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei","Noto Sans SC",sans-serif;
  --ff-mono:"SF Mono","JetBrains Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;
  --nav-h:72px;
}

/* ---------- 2. Reset ---------- */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{
  margin:0;padding:0;
  font-family:var(--ff);
  background:var(--bg);
  color:var(--text);
  font-size:15px;line-height:1.7;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
  overflow-x:hidden;
}
body::before{
  content:"";position:fixed;inset:0;z-index:-2;pointer-events:none;
  background:
    radial-gradient(900px 620px at 12% -8%,rgba(124,92,255,.20),transparent 62%),
    radial-gradient(760px 520px at 88% 4%,rgba(0,229,208,.14),transparent 60%),
    radial-gradient(700px 520px at 50% 108%,rgba(255,77,157,.10),transparent 62%),
    var(--bg);
}
body::after{
  content:"";position:fixed;inset:0;z-index:-1;pointer-events:none;opacity:.5;
  background-image:
    linear-gradient(rgba(255,255,255,.022) 1px,transparent 1px),
    linear-gradient(90deg,rgba(255,255,255,.022) 1px,transparent 1px);
  background-size:64px 64px;
  mask-image:radial-gradient(ellipse 90% 70% at 50% 0%,#000 35%,transparent 100%);
}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
button{font-family:inherit;cursor:pointer;border:0;background:none;color:inherit}
h1,h2,h3,h4,h5,h6{margin:0;font-weight:800;letter-spacing:-.02em;line-height:1.18}
p{margin:0}
ul{margin:0;padding:0;list-style:none}
::selection{background:rgba(124,92,255,.45);color:#fff}
::-webkit-scrollbar{width:10px;height:10px}
::-webkit-scrollbar-track{background:#080a11}
::-webkit-scrollbar-thumb{background:linear-gradient(180deg,#3a2f6b,#1b2233);border-radius:99px;border:2px solid #080a11}
:focus-visible{outline:2px solid var(--cyan);outline-offset:3px;border-radius:6px}

.wrap{width:100%;max-width:1200px;margin:0 auto;padding:0 22px}
.mono{font-family:var(--ff-mono);letter-spacing:.14em;text-transform:uppercase;font-size:11px;color:var(--muted)}
.grad-text{background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent}

/* ---------- 3. Buttons ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:9px;
  height:48px;padding:0 24px;border-radius:999px;
  font-size:14.5px;font-weight:700;letter-spacing:.01em;
  border:1px solid transparent;transition:.25s cubic-bezier(.2,.8,.2,1);
  white-space:nowrap;
}
.btn-primary{
  background:var(--grad);color:#080A12;
  box-shadow:0 12px 30px rgba(124,92,255,.35);
}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 18px 40px rgba(0,229,208,.32)}
.btn-ghost{background:var(--surface);border-color:var(--line-2);color:var(--text)}
.btn-ghost:hover{background:var(--surface-2);border-color:rgba(124,92,255,.55);transform:translateY(-2px)}
.btn-line{border-color:var(--line-2);color:var(--text-2)}
.btn-line:hover{color:#fff;border-color:var(--cyan)}
.btn-sm{height:38px;padding:0 16px;font-size:13px}
.btn-block{width:100%}

/* ---------- 4. Header ---------- */
.bt-header{
  position:sticky;top:0;z-index:80;
  height:var(--nav-h);
  background:rgba(6,7,12,.72);
  backdrop-filter:blur(18px) saturate(140%);
  -webkit-backdrop-filter:blur(18px) saturate(140%);
  border-bottom:1px solid var(--line);
  transition:.3s;
}
.bt-header.scrolled{background:rgba(6,7,12,.92);box-shadow:0 12px 40px rgba(0,0,0,.5)}
.bt-nav{height:100%;display:flex;align-items:center;gap:24px}
.bt-brand{display:flex;align-items:center;gap:12px;flex-shrink:0}
.bt-brand-mark{
  width:38px;height:38px;border-radius:12px;display:grid;place-items:center;
  background:var(--grad);color:#06070C;font-weight:900;font-size:16px;
  box-shadow:0 8px 22px rgba(124,92,255,.42);position:relative;overflow:hidden;
}
.bt-brand-mark svg{width:20px;height:20px}
.bt-brand-text{display:flex;flex-direction:column;line-height:1.15}
.bt-brand-text strong{font-size:15.5px;font-weight:800;letter-spacing:-.01em}
.bt-brand-text small{font-family:var(--ff-mono);font-size:9.5px;letter-spacing:.22em;color:var(--dim);text-transform:uppercase}
.bt-links{display:flex;align-items:center;gap:4px;margin-left:14px}
.bt-links a{
  padding:9px 14px;border-radius:999px;font-size:14px;color:var(--text-2);
  transition:.2s;font-weight:600;
}
.bt-links a:hover{color:#fff;background:var(--surface)}
.bt-links a.on{color:#fff;background:var(--surface-2);box-shadow:inset 0 0 0 1px var(--line-2)}
.bt-nav-right{display:flex;align-items:center;gap:10px;margin-left:auto}
.bt-icon-btn{
  width:40px;height:40px;border-radius:12px;display:grid;place-items:center;
  background:var(--surface);border:1px solid var(--line);color:var(--text-2);transition:.2s;
}
.bt-icon-btn:hover{color:#fff;border-color:rgba(124,92,255,.5);background:var(--surface-2)}
.bt-icon-btn svg{width:17px;height:17px}
.bt-menu-btn{display:none}

/* mobile drawer */
.bt-drawer{
  position:fixed;inset:0;z-index:120;pointer-events:none;
}
.bt-drawer-panel{
  position:absolute;right:0;top:0;height:100%;width:min(360px,88vw);
  background:linear-gradient(180deg,#0B0D16,#07080E);
  border-left:1px solid var(--line);
  padding:24px 22px;display:flex;flex-direction:column;gap:6px;
  transform:translateX(102%);transition:.32s cubic-bezier(.3,.9,.3,1);
  box-shadow:-30px 0 80px rgba(0,0,0,.6);
}
.bt-drawer.open{pointer-events:auto}
.bt-drawer.open .bt-drawer-panel{transform:none}
.bt-drawer-scrim{
  position:absolute;inset:0;background:rgba(2,3,6,.7);backdrop-filter:blur(4px);
  opacity:0;transition:.3s;
}
.bt-drawer.open .bt-drawer-scrim{opacity:1}
.bt-drawer-panel a{
  padding:14px 12px;border-radius:12px;font-size:15.5px;font-weight:600;color:var(--text-2);
  border-bottom:1px solid rgba(255,255,255,.05);
}
.bt-drawer-panel a:hover{background:var(--surface);color:#fff}
.bt-drawer-head{display:flex;align-items:center;justify-content:space-between;margin-bottom:14px}

/* ---------- 5. Hero ---------- */
.hero{position:relative;padding:calc(var(--nav-h) + 70px) 0 70px;overflow:hidden}
.hero-in{display:grid;grid-template-columns:1.06fr .94fr;gap:56px;align-items:center}
.hero-badge{
  display:inline-flex;align-items:center;gap:9px;
  padding:7px 15px 7px 11px;border-radius:999px;
  background:rgba(124,92,255,.10);border:1px solid rgba(124,92,255,.30);
  font-family:var(--ff-mono);font-size:10.5px;letter-spacing:.16em;text-transform:uppercase;color:#C9BEFF;
}
.hero-badge i{width:7px;height:7px;border-radius:50%;background:var(--cyan);box-shadow:0 0 0 0 rgba(0,229,208,.7);animation:ping 2.2s infinite}
@keyframes ping{0%{box-shadow:0 0 0 0 rgba(0,229,208,.55)}70%{box-shadow:0 0 0 11px rgba(0,229,208,0)}100%{box-shadow:0 0 0 0 rgba(0,229,208,0)}}
.hero h1{
  margin:26px 0 0;font-size:clamp(38px,5.1vw,68px);line-height:1.06;letter-spacing:-.035em;
}
.hero h1 .hl{
  position:relative;display:inline-block;
  background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent;
}
.hero-sub{
  margin:24px 0 0;max-width:520px;color:var(--text-2);font-size:16.5px;line-height:1.72;
}
.hero-cta{display:flex;flex-wrap:wrap;gap:12px;margin:34px 0 0}
.hero-stats{display:flex;gap:34px;margin:44px 0 0;flex-wrap:wrap}
.hero-stats div{display:flex;flex-direction:column;gap:4px}
.hero-stats strong{font-size:26px;font-weight:800;letter-spacing:-.03em}
.hero-stats span{font-family:var(--ff-mono);font-size:10px;letter-spacing:.18em;text-transform:uppercase;color:var(--dim)}

/* hero visual: neural orb + floating chips */
.hero-visual{position:relative;height:520px;display:grid;place-items:center}
.orb{
  position:relative;width:min(430px,86%);aspect-ratio:1;border-radius:50%;
  background:
    radial-gradient(circle at 32% 28%,rgba(167,139,255,.85),transparent 46%),
    radial-gradient(circle at 70% 68%,rgba(0,229,208,.65),transparent 48%),
    radial-gradient(circle at 50% 50%,#141a2e,#080a12 68%);
  box-shadow:
    0 0 90px rgba(124,92,255,.42),
    inset 0 0 90px rgba(0,229,208,.18),
    inset 0 0 0 1px rgba(255,255,255,.10);
  animation:orbFloat 9s ease-in-out infinite;
}
@keyframes orbFloat{0%,100%{transform:translateY(-8px) scale(1)}50%{transform:translateY(10px) scale(1.02)}}
.orb::before,.orb::after{
  content:"";position:absolute;inset:-9%;border-radius:50%;
  border:1px solid rgba(255,255,255,.10);
}
.orb::after{inset:-22%;border-style:dashed;border-color:rgba(0,229,208,.16);animation:spin 34s linear infinite}
@keyframes spin{to{transform:rotate(360deg)}}
.orb-grid{
  position:absolute;inset:0;border-radius:50%;overflow:hidden;opacity:.55;
  background-image:
    linear-gradient(rgba(255,255,255,.10) 1px,transparent 1px),
    linear-gradient(90deg,rgba(255,255,255,.10) 1px,transparent 1px);
  background-size:40px 40px;
  mask-image:radial-gradient(circle at 50% 50%,#000 30%,transparent 72%);
}
.chip-float{
  position:absolute;display:flex;align-items:center;gap:9px;
  padding:11px 16px;border-radius:14px;font-size:12.5px;font-weight:700;
  background:rgba(12,15,24,.86);border:1px solid var(--line-2);
  box-shadow:var(--shadow-sm);backdrop-filter:blur(12px);
  animation:chipFloat 7s ease-in-out infinite;
}
.chip-float b{color:var(--cyan);font-family:var(--ff-mono);font-size:10.5px;letter-spacing:.1em}
.chip-1{top:8%;left:-2%;animation-delay:0s}
.chip-2{top:26%;right:-4%;animation-delay:1.2s}
.chip-3{bottom:26%;left:2%;animation-delay:2.1s}
.chip-4{bottom:9%;right:2%;animation-delay:.6s}
@keyframes chipFloat{0%,100%{transform:translateY(0)}50%{transform:translateY(-12px)}}

/* ---------- 6. Marquee ---------- */
.marquee{
  border-top:1px solid var(--line);border-bottom:1px solid var(--line);
  background:rgba(255,255,255,.02);overflow:hidden;padding:15px 0;
}
.marquee-in{
  display:flex;gap:44px;white-space:nowrap;width:max-content;
  animation:slide 38s linear infinite;
  font-family:var(--ff-mono);font-size:11.5px;letter-spacing:.26em;text-transform:uppercase;color:var(--dim);
}
.marquee-in span{display:inline-flex;align-items:center;gap:44px}
.marquee-in i{color:var(--violet);font-style:normal}
@keyframes slide{to{transform:translateX(-50%)}}

/* ---------- 7. Section shell ---------- */
.section{padding:92px 0}
.sec-head{display:flex;align-items:flex-end;justify-content:space-between;gap:40px;margin-bottom:44px;flex-wrap:wrap}
.sec-head .l{max-width:560px}
.sec-head h2{font-size:clamp(26px,3.2vw,40px);letter-spacing:-.03em;margin-top:12px}
.sec-head p{color:var(--muted);font-size:15px;margin-top:14px;max-width:440px}
.sec-head .r{flex-shrink:0}

/* ---------- 8. Category tiles ---------- */
.cat-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:18px}
.cat-card{
  position:relative;display:flex;flex-direction:column;gap:14px;
  padding:26px 24px;border-radius:var(--radius);
  background:var(--surface);border:1px solid var(--line);
  overflow:hidden;transition:.35s cubic-bezier(.2,.8,.2,1);
}
.cat-card::after{
  content:"";position:absolute;inset:0;opacity:0;transition:.35s;
  background:radial-gradient(420px 200px at 20% 0%,rgba(124,92,255,.22),transparent 70%);
}
.cat-card:hover{transform:translateY(-6px);border-color:rgba(124,92,255,.42);box-shadow:var(--shadow)}
.cat-card:hover::after{opacity:1}
.cat-ico{
  width:48px;height:48px;border-radius:14px;display:grid;place-items:center;font-size:22px;
  background:var(--grad-soft);border:1px solid rgba(124,92,255,.28);
}
.cat-card h3{font-size:17px;position:relative}
.cat-card p{font-size:12.8px;color:var(--muted);line-height:1.6;position:relative;
  display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;min-height:41px}
.cat-meta{display:flex;align-items:center;justify-content:space-between;margin-top:auto;position:relative}
.cat-meta span{font-family:var(--ff-mono);font-size:10px;letter-spacing:.14em;color:var(--dim)}
.cat-meta b{color:var(--cyan);font-size:13px}

/* ---------- 9. Filters ---------- */
.filter-bar{display:flex;align-items:center;gap:12px;flex-wrap:wrap;margin-bottom:30px}
.filters{display:flex;gap:8px;flex-wrap:wrap}
.filter{
  padding:9px 17px;border-radius:999px;font-size:13px;font-weight:600;
  color:var(--text-2);background:var(--surface);border:1px solid var(--line);transition:.22s;
}
.filter:hover{color:#fff;border-color:var(--line-2);background:var(--surface-2)}
.filter.on{background:var(--grad);color:#07090F;border-color:transparent;box-shadow:0 8px 24px rgba(124,92,255,.34)}
.result-count{margin-left:auto;font-size:12.5px;color:var(--dim);font-family:var(--ff-mono);letter-spacing:.1em}
.result-count b{color:var(--cyan)}

/* ---------- 10. Product cards ---------- */
.product-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:22px}
.p-card{
  position:relative;display:flex;flex-direction:column;
  border-radius:var(--radius);overflow:hidden;
  background:linear-gradient(180deg,rgba(255,255,255,.055),rgba(255,255,255,.022));
  border:1px solid var(--line);
  transition:.35s cubic-bezier(.2,.8,.2,1);
}
.p-card:hover{transform:translateY(-8px);border-color:rgba(0,229,208,.38);box-shadow:0 30px 60px rgba(0,0,0,.55),0 0 0 1px rgba(0,229,208,.18)}
.p-media{position:relative;aspect-ratio:4/3;overflow:hidden;background:#0B0E18}
.p-media img{width:100%;height:100%;object-fit:cover;transition:transform .6s cubic-bezier(.2,.8,.2,1)}
.p-card:hover .p-media img{transform:scale(1.06)}
.p-badge{
  position:absolute;top:12px;left:12px;z-index:2;
  padding:5px 11px;border-radius:999px;font-size:10.5px;font-weight:800;
  background:rgba(6,8,14,.78);border:1px solid rgba(0,229,208,.42);color:var(--cyan);
  backdrop-filter:blur(8px);font-family:var(--ff-mono);letter-spacing:.1em;
}
.p-badge.hot{background:rgba(255,77,157,.16);border-color:rgba(255,77,157,.5);color:#FF9CC4}
.p-quick{
  position:absolute;right:12px;bottom:12px;z-index:2;
  padding:8px 14px;border-radius:999px;font-size:12px;font-weight:700;
  background:rgba(6,8,14,.8);border:1px solid var(--line-2);color:#fff;
  opacity:0;transform:translateY(8px);transition:.28s;backdrop-filter:blur(8px);
}
.p-card:hover .p-quick{opacity:1;transform:none}
.p-quick:hover{background:var(--grad);color:#07090F;border-color:transparent}
.p-body{padding:18px 18px 20px;display:flex;flex-direction:column;gap:8px;flex:1}
.p-series{font-family:var(--ff-mono);font-size:10px;letter-spacing:.18em;color:var(--violet-2);text-transform:uppercase}
.p-title{
  font-size:15px;font-weight:700;line-height:1.42;letter-spacing:-.01em;
  display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;min-height:43px;
}
.p-desc{font-size:12.3px;color:var(--muted);line-height:1.55;
  display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.p-foot{display:flex;align-items:center;justify-content:space-between;margin-top:auto;padding-top:12px;border-top:1px solid rgba(255,255,255,.06)}
.p-price{font-size:19px;font-weight:800;letter-spacing:-.03em}
.p-price small{font-size:11px;font-weight:700;color:var(--muted);margin-right:2px}
.p-go{
  width:36px;height:36px;border-radius:11px;display:grid;place-items:center;
  background:var(--surface);border:1px solid var(--line);color:var(--text-2);transition:.22s;
}
.p-card:hover .p-go{background:var(--grad);color:#07090F;border-color:transparent}

/* pagination */
.pager{display:flex;justify-content:center;gap:8px;margin-top:46px;flex-wrap:wrap}
.pager a,.pager span{
  min-width:42px;height:42px;padding:0 14px;border-radius:12px;display:grid;place-items:center;
  font-size:13.5px;font-weight:700;background:var(--surface);border:1px solid var(--line);color:var(--text-2);
  transition:.2s;
}
.pager a:hover{color:#fff;border-color:rgba(124,92,255,.5)}
.pager .on{background:var(--grad);color:#07090F;border-color:transparent}
.pager .off{opacity:.35;pointer-events:none}

/* ---------- 11. Feature / trust ---------- */
.feat-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:18px}
.feat{
  padding:28px 24px;border-radius:var(--radius);
  background:var(--surface);border:1px solid var(--line);transition:.3s;
}
.feat:hover{border-color:rgba(0,229,208,.34);transform:translateY(-4px)}
.feat-ico{
  width:44px;height:44px;border-radius:13px;display:grid;place-items:center;margin-bottom:16px;
  background:var(--grad-soft);border:1px solid rgba(124,92,255,.25);font-size:19px;
}
.feat h3{font-size:15.5px;margin-bottom:8px}
.feat p{font-size:12.8px;color:var(--muted);line-height:1.62}

/* ---------- 12. Flow ---------- */
.flow{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;position:relative}
.flow::before{
  content:"";position:absolute;top:46px;left:12%;right:12%;height:1px;
  background:linear-gradient(90deg,transparent,rgba(124,92,255,.5),rgba(0,229,208,.5),transparent);
}
.flow-step{position:relative;padding:30px 24px;border-radius:var(--radius);
  background:rgba(10,12,20,.72);border:1px solid var(--line);backdrop-filter:blur(8px)}
.flow-num{
  width:52px;height:52px;border-radius:50%;display:grid;place-items:center;
  font-family:var(--ff-mono);font-size:14px;font-weight:800;color:#07090F;
  background:var(--grad);box-shadow:0 10px 30px rgba(124,92,255,.4);margin-bottom:18px;
}
.flow-step h3{font-size:16.5px;margin-bottom:8px}
.flow-step p{font-size:13px;color:var(--muted)}

/* ---------- 13. FAQ ---------- */
.faq{max-width:860px;margin:0 auto}
.faq-item{
  border:1px solid var(--line);border-radius:var(--radius-sm);background:var(--surface);
  margin-bottom:12px;overflow:hidden;transition:.25s;
}
.faq-item[open]{border-color:rgba(124,92,255,.4);background:var(--surface-2)}
.faq-item summary{
  padding:19px 22px;font-size:14.8px;font-weight:700;cursor:pointer;
  display:flex;align-items:center;justify-content:space-between;gap:16px;list-style:none;
}
.faq-item summary::-webkit-details-marker{display:none}
.faq-item summary::after{
  content:"+";font-size:20px;font-weight:400;color:var(--violet-2);transition:.25s;line-height:1;
}
.faq-item[open] summary::after{content:"−";color:var(--cyan)}
.faq-item p{padding:0 22px 20px;color:var(--text-2);font-size:13.5px;line-height:1.75}

/* ---------- 14. CTA band ---------- */
.cta-band{
  position:relative;overflow:hidden;border-radius:32px;padding:64px 48px;
  background:
    radial-gradient(700px 320px at 12% 0%,rgba(124,92,255,.32),transparent 65%),
    radial-gradient(600px 300px at 88% 100%,rgba(0,229,208,.22),transparent 65%),
    linear-gradient(160deg,#0D1020,#080A12);
  border:1px solid var(--line-2);text-align:center;
}
.cta-band h2{font-size:clamp(26px,3.4vw,42px);letter-spacing:-.03em}
.cta-band p{color:var(--text-2);margin:16px auto 0;max-width:520px;font-size:15px}
.cta-band .btns{display:flex;gap:12px;justify-content:center;margin-top:34px;flex-wrap:wrap}

/* ---------- 15. Footer ---------- */
.bt-footer{border-top:1px solid var(--line);margin-top:40px;padding:60px 0 34px;background:rgba(255,255,255,.014)}
.ft-grid{display:grid;grid-template-columns:1.6fr 1fr 1fr 1fr;gap:36px;margin-bottom:44px}
.ft-about p{color:var(--muted);font-size:13px;margin-top:16px;max-width:330px;line-height:1.7}
.ft-col h4{font-family:var(--ff-mono);font-size:10.5px;letter-spacing:.2em;text-transform:uppercase;color:var(--dim);margin-bottom:16px}
.ft-col a{display:block;font-size:13.5px;color:var(--text-2);padding:6px 0;transition:.2s}
.ft-col a:hover{color:var(--cyan)}
.ft-bottom{
  border-top:1px solid var(--line);padding-top:26px;
  display:flex;align-items:center;justify-content:space-between;gap:18px;flex-wrap:wrap;
  font-size:12.3px;color:var(--dim);
}
.ft-bottom a:hover{color:var(--text-2)}

/* ---------- 16. Reveal ---------- */
.reveal{opacity:0;transform:translateY(26px);transition:opacity .7s cubic-bezier(.2,.8,.2,1),transform .7s cubic-bezier(.2,.8,.2,1)}
.reveal.in{opacity:1;transform:none}
@media (prefers-reduced-motion:reduce){
  .reveal{opacity:1!important;transform:none!important}
  .orb,.chip-float,.marquee-in{animation:none!important}
}

/* ---------- 17. Modal (quick view) ---------- */
.bt-modal{position:fixed;inset:0;z-index:200;display:none;align-items:center;justify-content:center;padding:20px}
.bt-modal.open{display:flex}
.bt-modal-scrim{position:absolute;inset:0;background:rgba(2,3,7,.82);backdrop-filter:blur(10px)}
.bt-modal-card{
  position:relative;width:min(920px,100%);max-height:90vh;overflow:auto;
  border-radius:28px;border:1px solid var(--line-2);
  background:linear-gradient(180deg,#0C0F1A,#080A11);
  box-shadow:var(--shadow);display:grid;grid-template-columns:1fr 1fr;
}
.bt-modal-media{background:#0A0D16;display:grid;place-items:center;min-height:340px}
.bt-modal-media img{width:100%;height:100%;object-fit:cover}
.bt-modal-body{padding:34px 32px}
.bt-modal-body h2{font-size:24px;margin:12px 0 14px;letter-spacing:-.02em}
.bt-modal-body p{color:var(--text-2);font-size:13.8px;line-height:1.75}
.bt-modal-meta{display:flex;gap:26px;margin:24px 0 26px;padding:18px 0;border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.bt-modal-meta div{display:flex;flex-direction:column;gap:4px}
.bt-modal-meta small{font-family:var(--ff-mono);font-size:9.5px;letter-spacing:.16em;text-transform:uppercase;color:var(--dim)}
.bt-modal-meta strong{font-size:19px}
.bt-modal-actions{display:flex;gap:10px}
.bt-close{
  position:absolute;top:14px;right:14px;z-index:3;
  width:36px;height:36px;border-radius:10px;display:grid;place-items:center;
  background:rgba(6,8,14,.8);border:1px solid var(--line-2);color:#fff;font-size:18px;
}

/* toast */
.bt-toast{
  position:fixed;left:50%;bottom:34px;transform:translate(-50%,20px);
  padding:12px 22px;border-radius:999px;font-size:13.5px;font-weight:600;
  background:rgba(10,13,22,.95);border:1px solid rgba(0,229,208,.45);color:#fff;
  box-shadow:var(--shadow-sm);opacity:0;transition:.3s;z-index:300;pointer-events:none;
}
.bt-toast.show{opacity:1;transform:translate(-50%,0)}

/* back to top */
.back-top{
  position:fixed;right:22px;bottom:22px;z-index:90;
  width:46px;height:46px;border-radius:14px;display:grid;place-items:center;
  background:rgba(10,13,22,.9);border:1px solid var(--line-2);color:var(--text-2);
  opacity:0;transform:translateY(12px);transition:.3s;pointer-events:none;backdrop-filter:blur(10px);
}
.back-top.show{opacity:1;transform:none;pointer-events:auto}
.back-top:hover{color:#07090F;background:var(--grad);border-color:transparent}

/* ---------- 18. INNER PAGES (bootstrap dark overrides) ---------- */
.container{width:100%;max-width:1200px;margin:0 auto;padding:0 22px}
.main-container{padding:36px 0 70px}
.breadcrumb-bar{
  display:flex;align-items:center;gap:8px;font-size:12.5px;color:var(--dim);
  padding:16px 0 24px;font-family:var(--ff-mono);letter-spacing:.06em;
}
.breadcrumb-bar a{color:var(--muted)}
.breadcrumb-bar a:hover{color:var(--cyan)}
.breadcrumb-bar b{color:var(--text)}

.page-head{padding:8px 0 12px}
.page-head h1{font-size:clamp(26px,3.4vw,38px);letter-spacing:-.03em}
.page-head p{color:var(--muted);margin-top:10px;font-size:14px}

/* cards */
.card{
  background:linear-gradient(180deg,rgba(255,255,255,.055),rgba(255,255,255,.02))!important;
  border:1px solid var(--line)!important;border-radius:var(--radius)!important;
  color:var(--text);box-shadow:var(--shadow-sm);overflow:hidden;
}
.card-header{
  background:rgba(255,255,255,.03)!important;border-bottom:1px solid var(--line)!important;
  padding:18px 24px!important;
}
.card-header h5{margin:0;font-size:15px;font-weight:700}
.card-body{padding:24px!important;color:var(--text-2)}
.card-title{font-size:22px;letter-spacing:-.02em;color:#fff!important;margin-bottom:10px}
.card-img-top{border-radius:var(--radius-sm);background:rgba(255,255,255,.03)}
.text-muted{color:var(--muted)!important}
.good-card .card .card-body{padding:28px!important}

/* badges */
.badge{
  font-size:11px!important;font-weight:700!important;letter-spacing:.04em;
  padding:6px 11px!important;border-radius:999px!important;
}
.badge.bg-success{background:rgba(43,227,139,.16)!important;color:var(--green)!important;border:1px solid rgba(43,227,139,.4)}
.badge.bg-warning{background:rgba(255,184,77,.16)!important;color:var(--amber)!important;border:1px solid rgba(255,184,77,.4)}
.badge.bg-danger{background:rgba(255,92,108,.16)!important;color:var(--red)!important;border:1px solid rgba(255,92,108,.4)}
.badge.bg-dark{background:rgba(255,255,255,.07)!important;color:var(--text-2)!important;border:1px solid var(--line)}

/* forms */
.form-control,.control{
  background:rgba(255,255,255,.045)!important;
  border:1px solid var(--line-2)!important;
  color:var(--text)!important;
  border-radius:var(--radius-xs)!important;
  padding:11px 14px!important;font-size:14px!important;
  transition:.2s;
}
.form-control:focus,.control:focus{
  background:rgba(255,255,255,.07)!important;
  border-color:var(--violet)!important;
  box-shadow:0 0 0 4px rgba(124,92,255,.16)!important;
  color:#fff!important;
}
.form-control::placeholder{color:var(--dim)!important;opacity:1}
.form-control-sm{padding:9px 12px!important;font-size:13.5px!important}
.form-control:disabled,.form-control[readonly]{opacity:.6}
.input-group-text{
  background:rgba(255,255,255,.06)!important;border:1px solid var(--line-2)!important;
  color:var(--text-2)!important;border-radius:var(--radius-xs)!important;font-weight:700;
}
.col-form-label{font-size:12.5px!important;font-weight:700;color:var(--muted)!important;letter-spacing:.04em;text-transform:uppercase}
label{color:var(--text-2)}
input[type=number]::-webkit-inner-spin-button{opacity:.5}
select.form-control option{background:#0C0F19;color:var(--text)}

/* buttons (bootstrap) */
.btn.btn-primary{
  background:var(--grad)!important;border:0!important;color:#07090F!important;
  font-weight:800!important;border-radius:999px!important;
  box-shadow:0 12px 30px rgba(124,92,255,.32)!important;
}
.btn.btn-primary:hover{transform:translateY(-2px)}
.btn.btn-secondary,.btn.btn-default{
  background:var(--surface)!important;border:1px solid var(--line-2)!important;color:var(--text-2)!important;
  border-radius:999px!important;font-weight:700!important;
}
.btn.btn-secondary:hover,.btn.btn-default:hover{color:#fff!important;border-color:var(--violet)!important}
.w-100{width:100%!important}

/* pay methods */
.pay-methods{display:flex;flex-wrap:wrap;gap:10px;margin-top:8px}
.pay-method{
  position:relative;display:flex;align-items:center;gap:9px;
  padding:12px 18px;border-radius:var(--radius-xs);
  background:var(--surface);border:1px solid var(--line);cursor:pointer;
  font-size:13.5px;font-weight:600;transition:.22s;margin:0;
}
.pay-method:hover{border-color:rgba(124,92,255,.45);background:var(--surface-2)}
.pay-method input{accent-color:var(--violet);margin:0}
.pay-method:has(input:checked){
  background:rgba(124,92,255,.14);border-color:var(--violet);
  box-shadow:0 0 0 1px var(--violet),0 10px 26px rgba(124,92,255,.22);
}
.pay-method-name{white-space:nowrap}

/* alerts / callouts */
.alert{border-radius:var(--radius-sm);border:1px solid var(--line-2);background:var(--surface);color:var(--text-2)}
.alert-success{background:rgba(43,227,139,.1);border-color:rgba(43,227,139,.35);color:#B9FFDD}
.alert-danger{background:rgba(255,92,108,.1);border-color:rgba(255,92,108,.35);color:#FFC7CC}
.alert-info{background:rgba(0,229,208,.08);border-color:rgba(0,229,208,.3);color:#B7FFF7}

/* tables */
.table{color:var(--text-2)!important;margin:0}
.table td,.table th{border-color:var(--line)!important;padding:12px 14px!important;font-size:13.5px}
.table thead th{color:var(--muted)!important;font-size:11.5px;text-transform:uppercase;letter-spacing:.1em;font-weight:700}
.table-hover tbody tr:hover{background:rgba(255,255,255,.03)!important}

/* modal (bootstrap) */
.modal-content{
  background:linear-gradient(180deg,#0C0F1A,#080A11)!important;
  border:1px solid var(--line-2)!important;border-radius:var(--radius)!important;color:var(--text);
}
.modal-header,.modal-footer{border-color:var(--line)!important;padding:18px 24px}
.modal-body{padding:24px;color:var(--text-2)}
.modal-title{font-size:17px;color:#fff}
.btn-close{filter:invert(1) grayscale(1);opacity:.6}
.modal-backdrop.show{opacity:.75}

/* description content */
.card-body img{border-radius:var(--radius-sm);margin:12px 0}
.card-body p{margin-bottom:12px;line-height:1.8}
.card-body h1,.card-body h2,.card-body h3{color:#fff;margin:18px 0 10px}
.card-body ul{list-style:disc;padding-left:20px;margin:10px 0}
.card-body li{margin:6px 0}

/* order / result pages */
.order-box,.order-info{
  background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:24px;
}
.order-box h4,.order-info h4{color:#fff;font-size:16px;margin-bottom:14px}

/* empty state */
.empty-state{
  text-align:center;padding:80px 24px;border-radius:var(--radius);
  border:1px dashed var(--line-2);background:var(--surface);
}
.empty-state b{display:block;font-size:17px;margin-bottom:8px;color:#fff}
.empty-state p{color:var(--muted);font-size:13.5px}

/* ---------- 19. Responsive ---------- */
@media (max-width:1080px){
  .hero-in{grid-template-columns:1fr;gap:44px}
  .hero-visual{height:420px;order:-1}
  .orb{width:min(330px,72%)}
  .cat-grid,.product-grid,.feat-grid{grid-template-columns:repeat(3,1fr)}
  .ft-grid{grid-template-columns:1fr 1fr}
}
@media (max-width:860px){
  .bt-links{display:none}
  .bt-menu-btn{display:grid}
  .product-grid,.cat-grid{grid-template-columns:repeat(2,1fr)}
  .feat-grid{grid-template-columns:repeat(2,1fr)}
  .flow{grid-template-columns:1fr}
  .flow::before{display:none}
  .section{padding:66px 0}
  .hero{padding:36px 0 50px}
  .hero-stats{gap:24px}
  .bt-modal-card{grid-template-columns:1fr}
  .bt-modal-media{min-height:200px;max-height:240px}
  .cta-band{padding:44px 24px;border-radius:24px}
  .sec-head{gap:20px}
}
@media (max-width:560px){
  .product-grid,.cat-grid,.feat-grid{grid-template-columns:1fr 1fr;gap:14px}
  .p-body{padding:14px 13px 16px}
  .p-title{font-size:13.5px;min-height:38px}
  .p-desc{display:none}
  .p-price{font-size:16.5px}
  .hero h1{font-size:34px}
  .hero-sub{font-size:15px}
  .wrap{padding:0 16px}
  .container{padding:0 16px}
  .chip-float{font-size:11px;padding:8px 12px}
  .ft-grid{grid-template-columns:1fr}
  .bt-brand-text strong{font-size:14px}
}

/* ---------- 20. Mobile overflow guards（390px 实测修正） ---------- */
html{overflow-x:hidden}
body{overflow-x:hidden}
.bt-nav{min-width:0}
.bt-nav-right{min-width:0;flex-shrink:0}
.bt-brand{min-width:0}
.bt-brand-text{min-width:0}
.bt-brand-text strong{overflow:hidden;text-overflow:ellipsis;white-space:nowrap;max-width:52vw}

@media (max-width:680px){
  .bt-nav{gap:10px}
  .bt-nav-right .btn-primary{display:none}
  .bt-nav-right .bt-icon-btn:not(.bt-menu-btn){display:none}
  .bt-brand-text small{display:none}
  .bt-brand-mark{width:34px;height:34px;border-radius:10px;font-size:14px}
  .bt-brand-text strong{font-size:14.5px}
  .product-grid{gap:12px}
  .cat-grid{gap:12px}
  .feat-grid{gap:12px}
  .wrap{padding:0 14px}
  .hero{padding:34px 0 44px}
  .hero-visual{height:330px;margin-bottom:6px}
  .orb{width:min(280px,76%)}
  .chip-float{font-size:10.5px;padding:7px 11px}
  .chip-1{left:0}
  .chip-2{right:0}
  .chip-3{left:0}
  .chip-4{right:0}
  .hero-stats{gap:20px;margin-top:30px}
  .hero-stats strong{font-size:21px}
  .hero-cta .btn{height:44px;padding:0 18px;font-size:13.5px}
  .sec-head{margin-bottom:28px}
  .section{padding:54px 0}
  .cta-band{padding:38px 20px}
  .coverage,.p-desc{display:none}
}
@media (max-width:420px){
  .product-grid{grid-template-columns:1fr 1fr}
  .p-title{font-size:12.8px}
  .p-price{font-size:15px}
  .p-body{padding:12px 11px 14px}
  .filter{padding:8px 13px;font-size:12px}
}

/* ---------- 21. Buy page refinements ---------- */
.good-card .card .col-md-4{padding:16px}
.good-card .card-img-top{
  padding:0!important;width:100%!important;aspect-ratio:1/1;object-fit:cover;
  border-radius:16px!important;border:1px solid var(--line);
  background:#0B0E18;
}
.good-card .card-body{padding:26px 26px 28px!important}
.good-card .card-title{font-size:24px!important;line-height:1.3;letter-spacing:-.02em}
.good-card .card-body h6{margin:0 0 10px}
.good-card .card-body h6 small{font-size:12.5px!important;color:var(--muted)!important}
.good-card .buy-form{margin-top:18px}
.good-card .form-group{margin-bottom:16px}
.stock-pill{
  display:inline-flex;align-items:center;gap:7px;padding:5px 12px;border-radius:999px;
  font-size:11.5px;font-weight:700;font-family:var(--ff-mono);letter-spacing:.06em;
  background:rgba(255,255,255,.06);border:1px solid var(--line);color:var(--text-2);
}
.stock-pill.ok{background:rgba(43,227,139,.12);border-color:rgba(43,227,139,.35);color:#8CFFC6}
.stock-pill.no{background:rgba(255,92,108,.12);border-color:rgba(255,92,108,.35);color:#FF9AA4}
.bt-note{
  padding:13px 17px;border-radius:12px;font-size:13px;line-height:1.6;
  background:rgba(255,184,77,.10);border:1px solid rgba(255,184,77,.35);color:#FFDBAC;
}
.bt-note b{color:#FFE9C9}
.good-card .btn-primary{height:52px;font-size:15px;border-radius:14px!important}
.good-card .sale .badge{margin-right:6px}
/* 描述卡排版 */
.card-body p:last-child{margin-bottom:0}
.card-body strong{color:#fff}
/* 订单/结果页表格可读性 */
.order-card .card-body,.order-info .card-body{padding:22px!important}

/* ---------- 22. Buy cover fills column height ---------- */
.good-card .card .row{min-height:100%}
.good-card .card .col-md-4{display:flex;align-items:stretch}
.good-card .card-img-top{
  height:100%!important;min-height:280px;aspect-ratio:auto!important;object-fit:cover;
}