/* ==========================================================================
   SkyForge 803 - 1400px industrial tech UI
   ========================================================================== */
:root {
  --ink: #0F172A;
  --ink-2: #1E293B;
  --muted: #64748B;
  --line: #E2E8F0;
  --bg: #F6F8FB;
  --white: #FFFFFF;
  --cyan: #06B6D4;
  --cyan-dark: #0891B2;
  --cyan-soft: #ECFEFF;
  --dark: #0B1220;
  --dark-2: #111C30;
  --orange: #FF7A18;
  --green: #16A34A;
  --red: #DC2626;
  --radius: 5px;
  --container: 1400px;
  --shadow: 0 18px 50px rgba(15, 23, 42, .08);
  --font: "Segoe UI", system-ui, -apple-system, Roboto, Arial, "Microsoft YaHei UI", sans-serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; overflow-x: hidden; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font);
  font-size: 15px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
button, input, textarea { font: inherit; }
button { cursor: pointer; }
h1, h2, h3, h4 { margin: 0 0 12px; line-height: 1.15; letter-spacing: -.02em; }
p { margin: 0 0 14px; }

.sf-container {
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 32px;
}

/* Buttons */
.sf-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 48px;
  padding: 0 24px;
  border: 1px solid transparent;
  border-radius: var(--radius);
  font-size: 14px;
  font-weight: 650;
  letter-spacing: .01em;
  transition: background .18s ease, color .18s ease, border-color .18s ease, transform .18s ease;
}
.sf-btn-primary { background: var(--cyan); color: #04252C; }
.sf-btn-primary:hover { background: var(--cyan-dark); color: #fff; transform: translateY(-1px); }
.sf-btn-ghost { background: transparent; color: #fff; border-color: rgba(255, 255, 255, .28); }
.sf-btn-ghost:hover { background: rgba(255, 255, 255, .08); border-color: var(--cyan); }
.sf-btn-sm { min-height: 38px; padding: 0 16px; font-size: 13px; }

.sf-eyebrow, .sf-kicker {
  display: inline-block;
  margin-bottom: 12px;
  color: var(--cyan-dark);
  font-size: 11px;
  font-weight: 750;
  letter-spacing: .16em;
  text-transform: uppercase;
}
.sf-eyebrow-dark { color: var(--cyan-dark); }
.sf-kicker { color: var(--muted); }
.sf-link { color: var(--cyan-dark); font-weight: 650; font-size: 14px; }
.sf-link:hover { color: var(--ink); }

/* Top bar */
.sf-topbar { background: var(--dark); color: rgba(255, 255, 255, .66); font-size: 12px; }
.sf-topbar-inner { display: flex; align-items: center; justify-content: space-between; height: 38px; gap: 16px; }
.sf-topbar a { color: var(--cyan); font-weight: 650; }
.sf-topbar-mid { color: rgba(255, 255, 255, .44); }

/* Header */
.sf-header {
  position: sticky;
  top: 0;
  z-index: 60;
  background: rgba(255, 255, 255, .96);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(12px);
  transition: box-shadow .2s ease;
}
.sf-header.is-scrolled { box-shadow: 0 10px 30px rgba(15, 23, 42, .07); }
.sf-header-inner { display: flex; align-items: center; gap: 26px; height: 84px; }
.sf-logo { display: inline-flex; align-items: center; flex: 0 0 auto; }
.sf-logo-badge { display: block; width: 96px; height: auto; }
.sf-logo-badge-light { width: 96px; }
.sf-logo-text { display: flex; flex-direction: column; line-height: 1.05; }
.sf-logo-text b { font-size: 19px; font-weight: 750; letter-spacing: -.02em; }
.sf-logo-text small { margin-top: 4px; font-size: 9px; font-weight: 700; letter-spacing: .18em; color: var(--muted); }
.sf-logo-light .sf-logo-text b { color: #fff; }
.sf-logo-light .sf-logo-text small { color: rgba(255, 255, 255, .5); }

.sf-nav { display: flex; align-items: center; gap: 22px; margin-left: auto; font-size: 13.5px; font-weight: 600; color: var(--ink-2); }
.sf-nav > a { padding: 6px 0; border-bottom: 2px solid transparent; }
.sf-nav > a:hover, .sf-nav > a.is-active { color: var(--cyan-dark); border-bottom-color: var(--cyan); }
.sf-nav-item { position: relative; }
/* 透明桥接层：覆盖按钮与下拉菜单之间的空隙，鼠标下移时菜单不会消失 */
.sf-nav-item::after {
  content: "";
  position: absolute;
  left: -8px;
  right: -8px;
  top: 100%;
  height: 26px;
  z-index: 1;
}
.sf-nav-drop { background: none; border: 0; padding: 6px 0; color: inherit; font-weight: 600; display: inline-flex; align-items: center; gap: 5px; }
.sf-nav-drop span { font-size: 9px; color: var(--muted); }
.sf-nav-drop:hover, .sf-nav-drop.is-active { color: var(--cyan-dark); }
.sf-menu {
  position: absolute;
  top: calc(100% + 12px);
  left: auto;
  right: -10px;
  width: 560px;
  padding: 18px;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  opacity: 0;
  visibility: hidden;
  transform: translateY(8px);
  transition: opacity .18s ease, transform .18s ease, visibility .18s;
}
.sf-nav-item:hover .sf-menu,
.sf-nav-item:focus-within .sf-menu,
.sf-nav-item.is-open .sf-menu { opacity: 1; visibility: visible; transform: translateY(0); }
.sf-nav-item .sf-menu { z-index: 2; }
.sf-menu-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 4px 18px; }
.sf-menu-grid a { display: flex; justify-content: space-between; gap: 12px; padding: 9px 10px; border-radius: 4px; font-size: 13px; }
.sf-menu-grid a:hover { background: var(--cyan-soft); }
.sf-menu-grid span { color: var(--muted); font-size: 11px; font-weight: 500; }
.sf-menu-all { display: block; margin-top: 12px; padding: 10px; border-top: 1px solid var(--line); color: var(--cyan-dark); font-size: 13px; }
.sf-nav-cta { min-height: 40px; padding: 0 18px; font-size: 13px; }
.sf-burger { display: none; width: 40px; height: 40px; margin-left: auto; background: none; border: 1px solid var(--line); border-radius: var(--radius); }
.sf-burger i { display: block; width: 17px; height: 2px; margin: 3px auto; background: var(--ink); }

/* Drawer */
.sf-drawer {
  position: fixed; top: 0; right: 0; z-index: 90;
  width: min(340px, 86vw); height: 100vh; padding: 22px;
  background: #fff; border-left: 1px solid var(--line);
  transform: translateX(100%); transition: transform .24s ease;
  overflow-y: auto;
}
.sf-drawer.is-open { transform: translateX(0); }
.sf-drawer-head { display: flex; justify-content: space-between; align-items: center; margin-bottom: 18px; font-weight: 750; }
.sf-drawer-close { border: 0; background: none; font-size: 28px; line-height: 1; color: var(--muted); }
.sf-drawer > a { display: block; padding: 12px 0; border-bottom: 1px solid var(--line); font-weight: 600; font-size: 14px; }
.sf-drawer .sf-btn { margin-top: 18px; }
.sf-overlay { position: fixed; inset: 0; z-index: 80; background: rgba(11, 18, 32, .45); opacity: 0; visibility: hidden; transition: .2s; }
.sf-overlay.is-open { opacity: 1; visibility: visible; }

/* Hero */
.sf-hero {
  position: relative;
  overflow: hidden;
  background:
    radial-gradient(900px 460px at 78% 18%, rgba(6, 182, 212, .22), transparent 62%),
    radial-gradient(700px 400px at 12% 90%, rgba(56, 189, 248, .10), transparent 60%),
    linear-gradient(135deg, #0B1220 0%, #101D33 58%, #0B1220 100%);
  color: #fff;
}
.sf-hero::before {
  content: "";
  position: absolute; inset: 0;
  background-image: linear-gradient(rgba(255,255,255,.035) 1px, transparent 1px),
                    linear-gradient(90deg, rgba(255,255,255,.035) 1px, transparent 1px);
  background-size: 64px 64px;
  mask-image: linear-gradient(to bottom, rgba(0,0,0,.9), transparent 85%);
}
.sf-hero-inner {
  position: relative;
  display: grid;
  grid-template-columns: 1.05fr .95fr;
  gap: 60px;
  align-items: center;
  min-height: 620px;
  padding-top: 56px;
  padding-bottom: 56px;
}
.sf-hero-copy .sf-eyebrow { color: var(--cyan); }
.sf-hero h1 { font-size: clamp(38px, 4.2vw, 58px); font-weight: 750; margin-bottom: 18px; }
.sf-hero p { max-width: 640px; color: rgba(255, 255, 255, .68); font-size: 16.5px; line-height: 1.7; }
.sf-hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin: 26px 0 32px; }
.sf-hero-stats { display: flex; gap: 38px; padding-top: 24px; border-top: 1px solid rgba(255, 255, 255, .12); }
.sf-hero-stats div { display: flex; flex-direction: column; }
.sf-hero-stats b { font-size: 26px; font-weight: 750; letter-spacing: -.02em; }
.sf-hero-stats span { font-size: 11px; letter-spacing: .12em; text-transform: uppercase; color: rgba(255, 255, 255, .48); }
.sf-hero-media { position: relative; }
.sf-hero-media > img {
  width: 100%;
  aspect-ratio: 1 / 1;
  object-fit: cover;
  border-radius: 8px;
  border: 1px solid rgba(255, 255, 255, .14);
  box-shadow: 0 40px 90px rgba(0, 0, 0, .38);
}
.sf-hero-media::after {
  content: "";
  position: absolute; inset: -18px -18px auto auto;
  width: 130px; height: 130px;
  border-top: 1px solid rgba(6, 182, 212, .5);
  border-right: 1px solid rgba(6, 182, 212, .5);
  border-radius: 0 8px 0 0;
  pointer-events: none;
}
.sf-hero-tag {
  position: absolute; left: 18px; bottom: 18px; right: 18px;
  display: flex; align-items: center; gap: 12px;
  padding: 12px 14px;
  background: rgba(11, 18, 32, .78);
  border: 1px solid rgba(255, 255, 255, .14);
  border-radius: var(--radius);
  backdrop-filter: blur(10px);
}
.sf-hero-tag span { color: var(--cyan); font-size: 10px; font-weight: 750; letter-spacing: .14em; text-transform: uppercase; }
.sf-hero-tag b { font-size: 12.5px; font-weight: 600; color: rgba(255, 255, 255, .86); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }

/* Trust */
.sf-trust { background: #fff; border-bottom: 1px solid var(--line); }
.sf-trust-inner { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; padding-top: 18px; padding-bottom: 18px; }
.sf-trust-inner span { position: relative; padding-left: 18px; color: var(--muted); font-size: 12.5px; font-weight: 600; letter-spacing: .02em; }
.sf-trust-inner span::before { content: ""; position: absolute; left: 0; top: 50%; width: 7px; height: 7px; margin-top: -3.5px; background: var(--cyan); border-radius: 50%; }

/* Sections */
.sf-section { padding: 76px 0; }
.sf-section-soft { background: #fff; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.sf-section-dark { background: var(--dark); color: #fff; }
.sf-sec-head { display: flex; align-items: flex-end; justify-content: space-between; gap: 24px; margin-bottom: 30px; }
.sf-sec-head h2 { font-size: clamp(26px, 2.4vw, 38px); font-weight: 720; margin: 0; }
.sf-section-dark .sf-kicker { color: rgba(6, 182, 212, .9); }
.sf-section-dark .sf-sec-head h2 { color: #fff; }

/* Category cards */
.sf-cat-grid { display: grid; grid-template-columns: repeat(5, minmax(0, 1fr)); gap: 14px; }
.sf-cat-card {
  position: relative;
  display: flex; flex-direction: column; gap: 6px;
  padding: 20px 18px 18px;
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius);
  transition: border-color .18s ease, transform .18s ease, box-shadow .18s ease;
}
.sf-cat-card:hover { border-color: var(--cyan); transform: translateY(-2px); box-shadow: 0 12px 28px rgba(15, 23, 42, .07); }
.sf-cat-name { font-size: 14.5px; font-weight: 700; padding-right: 20px; }
.sf-cat-count { color: var(--muted); font-size: 12px; }
.sf-cat-arrow { position: absolute; right: 16px; top: 18px; color: var(--cyan-dark); font-size: 14px; opacity: 0; transform: translateX(-4px); transition: .18s; }
.sf-cat-card:hover .sf-cat-arrow { opacity: 1; transform: translateX(0); }

/* Product grid */
.sf-grid { display: grid; gap: 20px; }
.sf-grid-4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
.sf-card {
  display: flex; flex-direction: column;
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius);
  overflow: hidden;
  transition: border-color .18s ease, transform .18s ease, box-shadow .18s ease;
}
.sf-card:hover { border-color: var(--cyan); transform: translateY(-3px); box-shadow: 0 16px 36px rgba(15, 23, 42, .08); }
.sf-card-media { position: relative; aspect-ratio: 1 / 1; background: #F1F5F9; overflow: hidden; }
.sf-card-media img { width: 100%; height: 100%; object-fit: cover; transition: transform .45s ease; }
.sf-card:hover .sf-card-media img { transform: scale(1.045); }
.sf-card-cat {
  position: absolute; left: 10px; top: 10px;
  padding: 4px 9px; border-radius: 3px;
  background: rgba(11, 18, 32, .78); color: #fff;
  font-size: 10px; font-weight: 650; letter-spacing: .04em;
  backdrop-filter: blur(6px);
}
.sf-card-body { display: flex; flex-direction: column; flex: 1; padding: 15px 15px 14px; }
.sf-card-body h3 {
  margin: 0 0 12px; font-size: 13.5px; line-height: 1.45; font-weight: 600;
  display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden;
  min-height: 39px;
}
.sf-card-foot { display: flex; align-items: flex-end; justify-content: space-between; gap: 10px; margin-top: auto; }
.sf-card-foot b { display: block; font-size: 15.5px; font-weight: 750; color: var(--ink); }
.sf-card-foot b.is-quote { font-size: 13px; color: var(--cyan-dark); }
.sf-card-foot span { color: var(--muted); font-size: 11px; }
.sf-card-link { color: var(--muted); font-size: 11.5px; font-weight: 650; white-space: nowrap; }
.sf-card:hover .sf-card-link { color: var(--cyan-dark); }

/* Capabilities */
.sf-cap-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 20px; }
.sf-cap-card { display: flex; flex-direction: column; background: #fff; border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; }
.sf-cap-img { aspect-ratio: 16 / 10; background: #F1F5F9; overflow: hidden; }
.sf-cap-img img { width: 100%; height: 100%; object-fit: cover; }
.sf-cap-body { padding: 20px; }
.sf-cap-body h3 { font-size: 18px; }
.sf-cap-body p { color: var(--muted); font-size: 13px; }
.sf-cap-body span { color: var(--cyan-dark); font-size: 12.5px; font-weight: 650; }

/* About split */
.sf-about-split { display: grid; grid-template-columns: 1.1fr .9fr; gap: 60px; align-items: center; }
.sf-about-split p { color: rgba(255, 255, 255, .64); }
.sf-stat-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 1px; background: rgba(255, 255, 255, .12); border: 1px solid rgba(255, 255, 255, .12); border-radius: var(--radius); overflow: hidden; }
.sf-stat-grid div { padding: 26px 22px; background: var(--dark-2); }
.sf-stat-grid b { display: block; font-size: 34px; font-weight: 750; letter-spacing: -.03em; color: var(--cyan); }
.sf-stat-grid span { color: rgba(255, 255, 255, .52); font-size: 12px; }
.sf-stat-grid-light { background: var(--line); border-color: var(--line); }
.sf-stat-grid-light div { background: #fff; }
.sf-stat-grid-light b { color: var(--ink); }
.sf-stat-grid-light span { color: var(--muted); }

/* FAQ */
.sf-faq-wrap { max-width: 980px; }
.sf-faq { border-bottom: 1px solid var(--line); padding: 18px 0; }
.sf-faq summary { list-style: none; cursor: pointer; font-weight: 650; font-size: 15px; padding-right: 28px; position: relative; }
.sf-faq summary::-webkit-details-marker { display: none; }
.sf-faq summary::after { content: "+"; position: absolute; right: 0; top: -2px; color: var(--cyan-dark); font-size: 20px; font-weight: 400; }
.sf-faq[open] summary::after { content: "-"; }
.sf-faq p { margin: 12px 0 0; color: var(--muted); font-size: 14px; }

/* CTA */
.sf-cta { background: linear-gradient(120deg, #0B1220, #14243B); color: #fff; padding: 56px 0; }
.sf-cta-inner { display: flex; align-items: center; justify-content: space-between; gap: 30px; }
.sf-cta h2 { font-size: clamp(24px, 2.4vw, 34px); margin-bottom: 6px; }
.sf-cta p { margin: 0; color: rgba(255, 255, 255, .58); }

/* Page hero */
.sf-page-hero { padding: 64px 0 46px; background: linear-gradient(180deg, #fff, var(--bg)); border-bottom: 1px solid var(--line); }
.sf-page-hero h1 { font-size: clamp(32px, 3.4vw, 48px); font-weight: 750; }
.sf-page-hero p { color: var(--muted); font-size: 16px; max-width: 720px; }

/* Breadcrumb */
.sf-crumb { display: flex; flex-wrap: wrap; gap: 8px; padding: 18px 0; color: var(--muted); font-size: 12px; }
.sf-crumb a:hover { color: var(--cyan-dark); }
.sf-crumb span { color: #94A3B8; }

/* List page */
.sf-list-page { padding-top: 8px; padding-bottom: 74px; }
.sf-list-head { display: flex; align-items: flex-end; justify-content: space-between; gap: 24px; padding: 8px 0 26px; border-bottom: 1px solid var(--line); }
.sf-list-head h1 { font-size: clamp(30px, 3vw, 42px); }
.sf-list-head p { margin: 0; color: var(--muted); max-width: 760px; }
.sf-result { color: var(--muted); font-size: 13px; white-space: nowrap; }
.sf-chips { display: none; gap: 8px; overflow-x: auto; padding: 16px 0 4px; }
.sf-chip { flex: 0 0 auto; padding: 7px 12px; border: 1px solid var(--line); border-radius: 999px; background: #fff; color: var(--muted); font-size: 12px; }
.sf-chip.is-active { border-color: var(--cyan); color: var(--cyan-dark); background: var(--cyan-soft); }
.sf-list-layout { display: grid; grid-template-columns: 260px minmax(0, 1fr); gap: 34px; padding-top: 30px; }
.sf-side { align-self: start; position: sticky; top: 100px; border: 1px solid var(--line); border-radius: var(--radius); background: #fff; overflow: hidden; }
.sf-side-title { padding: 14px 16px; border-bottom: 1px solid var(--line); font-size: 11px; font-weight: 750; letter-spacing: .12em; text-transform: uppercase; color: var(--muted); }
.sf-side-link { display: flex; justify-content: space-between; gap: 10px; padding: 11px 16px; border-bottom: 1px solid #F1F5F9; font-size: 13px; color: var(--ink-2); }
.sf-side-link b { color: var(--muted); font-weight: 500; font-size: 11px; }
.sf-side-link:hover, .sf-side-link.is-active { background: var(--cyan-soft); color: var(--cyan-dark); }
.sf-side-link.is-active { font-weight: 700; }
.sf-list-main .sf-grid-4 { grid-template-columns: repeat(3, minmax(0, 1fr)); }

/* Pagination */
.sf-pager { display: flex; flex-wrap: wrap; align-items: center; justify-content: center; gap: 7px; margin-top: 38px; }
.sf-pager-btn, .sf-pager-num { display: inline-flex; align-items: center; justify-content: center; min-width: 38px; height: 38px; padding: 0 12px; border: 1px solid var(--line); border-radius: var(--radius); background: #fff; font-size: 13px; color: var(--ink-2); }
.sf-pager-num.is-active { background: var(--ink); border-color: var(--ink); color: #fff; }
.sf-pager-btn:hover, .sf-pager-num:hover { border-color: var(--cyan); color: var(--cyan-dark); }
.sf-pager-dot { color: var(--muted); padding: 0 2px; }

/* Product detail */
.sf-product-page { padding-bottom: 70px; }
.sf-product-top { display: grid; grid-template-columns: minmax(0, 1.05fr) minmax(0, .95fr); gap: 46px; padding: 6px 0 46px; }
.sf-product-media { align-self: start; position: sticky; top: 104px; min-width: 0; }
.sf-product-info { min-width: 0; }
.sf-gallery-main { width: 100%; min-width: 0; aspect-ratio: 1 / 1; background: #fff; border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; }
.sf-gallery-main img { width: 100%; height: 100%; object-fit: contain; }
.sf-thumbs { display: flex; gap: 8px; width: 100%; min-width: 0; margin-top: 10px; overflow-x: auto; padding-bottom: 4px; }
.sf-thumb { flex: 0 0 78px; width: 78px; height: 78px; padding: 0; border: 1px solid var(--line); border-radius: 4px; background: #fff; overflow: hidden; }
.sf-thumb img { width: 100%; height: 100%; object-fit: cover; }
.sf-thumb.is-active { border-color: var(--cyan); box-shadow: 0 0 0 1px var(--cyan); }
.sf-product-info h1 { font-size: clamp(24px, 2.4vw, 34px); font-weight: 720; margin: 6px 0 16px; }
.sf-price-row { display: flex; align-items: baseline; gap: 8px; padding: 16px 0; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.sf-price { font-size: 30px; font-weight: 750; letter-spacing: -.02em; }
.sf-price-quote { font-size: 22px; color: var(--cyan-dark); }
.sf-unit { color: var(--muted); font-size: 12.5px; }
.sf-price-est {
  display: inline-block;
  margin-left: 8px;
  padding: 3px 8px;
  border-radius: 3px;
  background: #FFF7ED;
  color: #C2410C;
  font-size: 10px;
  font-weight: 700;
  letter-spacing: .08em;
  text-transform: uppercase;
  vertical-align: middle;
}
.sf-est-note {
  margin: 0 0 18px;
  padding: 8px 12px;
  border: 1px solid #FDE68A;
  border-radius: 4px;
  background: #FFFBEB;
  color: #92400E;
  font-size: 11.5px;
}
.sf-moq { margin: 12px 0 18px; color: var(--muted); font-size: 12.5px; }
.sf-quick-specs { list-style: none; margin: 0 0 22px; padding: 0; border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; }
.sf-quick-specs li { display: flex; justify-content: space-between; gap: 16px; padding: 10px 14px; border-bottom: 1px solid #F1F5F9; font-size: 12.5px; background: #fff; }
.sf-quick-specs li:last-child { border-bottom: 0; }
.sf-quick-specs span { color: var(--muted); }
.sf-quick-specs b { font-weight: 600; text-align: right; }

/* Buy */
.sf-buy { padding: 18px; border: 1px solid var(--line); border-radius: var(--radius); background: #fff; }
.sf-buy-row { margin-bottom: 14px; }
.sf-buy-row label { display: block; margin-bottom: 6px; color: var(--muted); font-size: 11.5px; font-weight: 650; letter-spacing: .03em; text-transform: uppercase; }
.sf-buy-row input { width: 100%; height: 44px; padding: 0 12px; border: 1px solid var(--line); border-radius: 4px; background: #fff; outline: none; }
.sf-buy-row input:focus { border-color: var(--cyan); box-shadow: 0 0 0 3px rgba(6, 182, 212, .12); }
.sf-qty-wrap { display: grid; grid-template-columns: 42px 1fr 42px; }
.sf-qty-wrap input { text-align: center; border-left: 0; border-right: 0; border-radius: 0; -moz-appearance: textfield; }
.sf-qty-wrap input::-webkit-outer-spin-button, .sf-qty-wrap input::-webkit-inner-spin-button { -webkit-appearance: none; margin: 0; }
.sf-qty-btn { height: 44px; border: 1px solid var(--line); background: #F8FAFC; color: var(--ink); font-size: 16px; }
.sf-qty-btn:first-child { border-radius: 4px 0 0 4px; }
.sf-qty-btn:last-child { border-radius: 0 4px 4px 0; }
.sf-buy-total { display: flex; align-items: baseline; justify-content: space-between; padding: 14px 0; border-top: 1px solid var(--line); margin-bottom: 6px; }
.sf-buy-total span { color: var(--muted); font-size: 12px; }
.sf-buy-total b { font-size: 24px; font-weight: 750; }
.sf-buy-btn { width: 100%; }
.sf-buy-msg { min-height: 18px; margin: 8px 0 0; color: var(--red); font-size: 12px; }
.sf-buy-note { margin: 8px 0 0; color: var(--muted); font-size: 11.5px; }
.sf-buy-quote { display: flex; align-items: center; justify-content: space-between; gap: 18px; }
.sf-buy-quote-text b { display: block; font-size: 16px; }
.sf-buy-quote-text span { color: var(--muted); font-size: 12.5px; }
.sf-pay-note { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 14px; }
.sf-pay-note span { padding: 5px 10px; border: 1px solid var(--line); border-radius: 999px; color: var(--muted); font-size: 10.5px; background: #fff; }

/* Product sections */
.sf-product-section { padding: 34px 0; border-top: 1px solid var(--line); }
.sf-product-section .sf-sec-head { margin-bottom: 20px; }
.sf-product-section h2 { font-size: clamp(22px, 2vw, 30px); }
.sf-desc { max-width: 980px; }
.sf-desc p { color: var(--ink-2); font-size: 14.5px; }
.sf-desc figure { margin: 18px 0; }
.sf-desc figure img { width: 100%; border: 1px solid var(--line); border-radius: var(--radius); background: #fff; }
.sf-spec-table { width: 100%; border-collapse: collapse; background: #fff; border: 1px solid var(--line); }
.sf-spec-table tr { border-bottom: 1px solid var(--line); }
.sf-spec-table tr:last-child { border-bottom: 0; }
.sf-spec-table th { width: 34%; padding: 11px 16px; background: #F8FAFC; color: var(--muted); font-weight: 550; text-align: left; font-size: 12.5px; }
.sf-spec-table td { padding: 11px 16px; font-size: 13px; }
.sf-sku { display: flex; gap: 20px; padding: 14px 0; border-bottom: 1px solid var(--line); }
.sf-sku > span { flex: 0 0 160px; color: var(--muted); font-size: 12.5px; }
.sf-sku div { display: flex; flex-wrap: wrap; gap: 7px; }
.sf-sku em { font-style: normal; padding: 4px 9px; border: 1px solid var(--line); border-radius: 3px; background: #fff; font-size: 12px; }

/* About visual */
.sf-about-visual { padding: 0 0 64px; background: var(--bg); }
.sf-about-banner {
  position: relative;
  margin: 0;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: var(--dark);
}
.sf-about-banner img {
  width: 100%;
  aspect-ratio: 1400 / 600;
  object-fit: cover;
  display: block;
}
.sf-about-banner::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(90deg, rgba(11, 18, 32, .82) 0%, rgba(11, 18, 32, .35) 44%, rgba(11, 18, 32, 0) 70%);
  pointer-events: none;
}
.sf-about-banner figcaption {
  position: absolute;
  left: 34px;
  right: 34px;
  bottom: 30px;
  z-index: 2;
  max-width: 640px;
  color: #fff;
}
.sf-about-banner figcaption span {
  display: block;
  margin-bottom: 8px;
  color: var(--cyan);
  font-size: 10px;
  font-weight: 750;
  letter-spacing: .18em;
  text-transform: uppercase;
}
.sf-about-banner figcaption b {
  display: block;
  font-size: clamp(18px, 2vw, 28px);
  font-weight: 700;
  line-height: 1.25;
  letter-spacing: -.02em;
}

/* Prose */
.sf-prose { max-width: 900px; }
.sf-prose p { color: var(--ink-2); font-size: 15.5px; line-height: 1.8; }

/* Contact */
.sf-contact-grid { display: grid; grid-template-columns: .85fr 1.15fr; gap: 56px; }
.sf-contact-info h2 { font-size: 26px; }
.sf-contact-info > p { color: var(--muted); }
.sf-contact-info ul { list-style: none; margin: 24px 0 0; padding: 0; border-top: 1px solid var(--line); }
.sf-contact-info li { display: flex; gap: 18px; padding: 12px 0; border-bottom: 1px solid var(--line); font-size: 13px; }
.sf-contact-info li span { flex: 0 0 110px; color: var(--muted); }
.sf-contact-info li b { font-weight: 600; }
.sf-contact-form { padding: 26px; background: #fff; border: 1px solid var(--line); border-radius: var(--radius); }

/* Forms */
.sf-form-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.sf-form label { display: block; font-size: 12px; color: var(--muted); font-weight: 600; }
.sf-form label em { color: var(--red); font-style: normal; }
.sf-form input, .sf-form textarea { width: 100%; margin-top: 6px; padding: 10px 12px; border: 1px solid var(--line); border-radius: 4px; background: #fff; outline: none; font-size: 14px; }
.sf-form input:focus, .sf-form textarea:focus { border-color: var(--cyan); box-shadow: 0 0 0 3px rgba(6, 182, 212, .12); }
.sf-form textarea { resize: vertical; }
.sf-form-full { grid-column: 1 / -1; }
.sf-form .sf-btn { margin-top: 16px; width: 100%; }
.sf-form-msg { min-height: 18px; margin: 10px 0 0; font-size: 12.5px; color: var(--red); }
.sf-form-msg.is-ok { color: var(--green); }

/* Modal */
.sf-modal { position: fixed; inset: 0; z-index: 120; display: flex; align-items: center; justify-content: center; padding: 20px; }
.sf-modal[hidden] { display: none; }
.sf-modal-bg { position: absolute; inset: 0; background: rgba(11, 18, 32, .55); backdrop-filter: blur(3px); }
.sf-modal-box { position: relative; width: 100%; max-width: 640px; max-height: 90vh; overflow-y: auto; padding: 30px; background: #fff; border: 1px solid var(--line); border-radius: var(--radius); box-shadow: 0 30px 80px rgba(0, 0, 0, .25); }
.sf-modal-box h3 { font-size: 24px; margin-bottom: 6px; }
.sf-modal-sub { color: var(--muted); font-size: 13px; margin-bottom: 18px; }
.sf-modal-close { position: absolute; right: 14px; top: 10px; border: 0; background: none; color: var(--muted); font-size: 28px; line-height: 1; }

/* Footer */
.sf-footer { background: var(--dark); color: rgba(255, 255, 255, .62); padding-top: 56px; }
.sf-footer-grid { display: grid; grid-template-columns: 1.5fr .8fr .7fr 1fr; gap: 40px; padding-bottom: 44px; }
.sf-footer-brand p { margin: 18px 0 10px; font-size: 13px; line-height: 1.7; max-width: 380px; }
.sf-footer-slogan { color: var(--cyan); font-size: 11px; font-weight: 700; letter-spacing: .12em; text-transform: uppercase; }
.sf-footer-col h4 { color: #fff; font-size: 12px; font-weight: 700; letter-spacing: .1em; text-transform: uppercase; margin-bottom: 14px; }
.sf-footer-col a, .sf-footer-col p { display: block; margin: 0 0 9px; color: rgba(255, 255, 255, .56); font-size: 13px; }
.sf-footer-col a:hover { color: var(--cyan); }
.sf-footer-contact .sf-btn { margin: 8px 0 16px; }
.sf-footer-pay { display: flex; flex-wrap: wrap; gap: 6px; }
.sf-footer-pay span { padding: 4px 8px; border: 1px solid rgba(255, 255, 255, .14); border-radius: 3px; font-size: 10px; color: rgba(255, 255, 255, .5); }
.sf-footer-bottom { border-top: 1px solid rgba(255, 255, 255, .1); }
.sf-footer-bottom .sf-container { display: flex; justify-content: space-between; gap: 20px; padding-top: 18px; padding-bottom: 18px; font-size: 11.5px; color: rgba(255, 255, 255, .38); }

/* Responsive */
@media (max-width: 1240px) {
  .sf-container { padding: 0 26px; }
  .sf-nav { gap: 16px; }
  .sf-grid-4 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .sf-cat-grid { grid-template-columns: repeat(4, minmax(0, 1fr)); }
  .sf-list-main .sf-grid-4 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .sf-hero-inner { gap: 40px; }
}

@media (max-width: 1024px) {
  .sf-topbar-mid { display: none; }
  .sf-nav { display: none; }
  .sf-nav-cta { display: none; }
  .sf-burger { display: block; }
  .sf-hero-inner { grid-template-columns: 1fr; min-height: 0; padding-top: 44px; padding-bottom: 48px; }
  .sf-hero-media { max-width: 640px; }
  .sf-about-split { grid-template-columns: 1fr; gap: 34px; }
  .sf-product-top { grid-template-columns: minmax(0, 1fr); gap: 28px; }
  .sf-product-media { position: static; }
  .sf-list-layout { grid-template-columns: 1fr; gap: 20px; }
  .sf-side { display: none; }
  .sf-chips { display: flex; }
  .sf-contact-grid { grid-template-columns: 1fr; gap: 30px; }
  .sf-footer-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 900px) {
  .sf-grid-4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .sf-cat-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .sf-cap-grid { grid-template-columns: 1fr; }
  .sf-list-main .sf-grid-4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .sf-trust-inner { grid-template-columns: 1fr 1fr; }
  .sf-hero-stats { gap: 26px; }
}

@media (max-width: 640px) {
  .sf-container { padding: 0 18px; }
  .sf-topbar { display: none; }
  .sf-header-inner { height: 72px; }
  .sf-logo-badge { width: 84px; }
  .sf-logo-badge-light { width: 84px; }
  .sf-hero h1 { font-size: 34px; }
  .sf-hero p { font-size: 14.5px; }
  .sf-hero-stats b { font-size: 22px; }
  .sf-hero-media > img { aspect-ratio: 4 / 3; }
  .sf-section { padding: 52px 0; }
  .sf-sec-head { flex-direction: column; align-items: flex-start; gap: 10px; }
  .sf-cat-grid { grid-template-columns: 1fr 1fr; gap: 10px; }
  .sf-cat-card { padding: 15px 14px; }
  .sf-grid-4, .sf-list-main .sf-grid-4 { grid-template-columns: 1fr 1fr; gap: 12px; }
  .sf-card-body { padding: 11px; }
  .sf-card-body h3 { font-size: 12.5px; min-height: 36px; }
  .sf-card-foot b { font-size: 14px; }
  .sf-card-link { display: none; }
  .sf-card-cat { font-size: 9px; padding: 3px 7px; }
  .sf-cta-inner { flex-direction: column; align-items: flex-start; }
  .sf-form-grid { grid-template-columns: 1fr; }
  .sf-form-full { grid-column: auto; }
  .sf-modal-box { padding: 22px 18px; }
  .sf-footer-grid { grid-template-columns: 1fr; gap: 28px; }
  .sf-footer-bottom .sf-container { flex-direction: column; gap: 6px; }
  .sf-pager-num { min-width: 34px; height: 34px; }
  .sf-pager-btn { height: 34px; }
  .sf-buy-quote { flex-direction: column; align-items: flex-start; }
  .sf-sku { flex-direction: column; gap: 6px; }
  .sf-sku > span { flex: none; }
  .sf-spec-table th { width: 42%; }
  .sf-product-info h1 { font-size: 24px; }
  .sf-about-visual { padding-bottom: 44px; }
  .sf-about-banner img { aspect-ratio: 4 / 3; }
  .sf-about-banner figcaption { left: 18px; right: 18px; bottom: 16px; }
  .sf-about-banner figcaption b { font-size: 16px; }
}

@media (prefers-reduced-motion: reduce) {
  * { transition: none !important; animation: none !important; scroll-behavior: auto !important; }
}