:root {
  --ink: #0f2437;
  --ink-soft: #3d566e;
  --muted: #6b7f92;
  --bg: #ffffff;
  --bg-soft: #f4f8fb;
  --bg-card: #ffffff;
  --line: #dce6ee;
  --accent: #0a6e8a;
  --accent-strong: #075063;
  --accent-soft: #e3f2f7;
  --teal: #12a5c9;
  --gold: #b98a2f;
  --gold-soft: #faf3e3;
  --danger: #b3452f;
  --green: #27a567;
  --radius: 16px;
  --shadow: 0 10px 30px rgba(15, 36, 55, .08);
  --shadow-lg: 0 24px 60px rgba(15, 36, 55, .14);
  --maxw: 1160px;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }

body {
  font-family: "Segoe UI", "Helvetica Neue", Arial, "PingFang SC", sans-serif;
  color: var(--ink);
  background: var(--bg);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; display: block; }
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: none; }
.container { max-width: var(--maxw); margin: 0 auto; padding: 0 24px; }

/* ================= Header ================= */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: rgba(255,255,255,.92);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}
.nav { display: flex; align-items: center; justify-content: space-between; height: 68px; }
.brand {
  font-weight: 700; font-size: 1.15rem; color: var(--ink);
  display: flex; align-items: center; gap: 10px;
}
.brand .mark {
  width: 32px; height: 32px; border-radius: 9px;
  background: linear-gradient(135deg, var(--accent), var(--teal));
  color: #fff; display: flex; align-items: center; justify-content: center;
  font-size: .8rem; font-weight: 800; letter-spacing: .5px;
  box-shadow: 0 4px 12px rgba(10,110,138,.35);
}
.brand span.rel { color: var(--accent); }
.nav-links { display: flex; gap: 26px; align-items: center; }
.nav-links a { color: var(--ink-soft); font-size: .95rem; font-weight: 500; }
.nav-links a:hover { color: var(--accent); }
.nav-cta {
  background: var(--accent); color: #fff !important;
  padding: 10px 20px; border-radius: 9px; font-weight: 600;
  box-shadow: 0 4px 14px rgba(10,110,138,.3);
}
.nav-cta:hover { background: var(--accent-strong); }
.menu-toggle { display: none; }

/* ================= Hero ================= */
.hero {
  background:
    radial-gradient(1000px 460px at 88% -12%, #d9edf5 0%, transparent 60%),
    radial-gradient(760px 400px at -6% 112%, #eaf6ef 0%, transparent 55%),
    var(--bg);
  border-bottom: 1px solid var(--line);
  padding: 84px 0 76px;
  overflow: hidden;
}
.hero-grid { display: grid; grid-template-columns: 1.15fr .85fr; gap: 48px; align-items: center; }
.hero .eyebrow {
  display: inline-flex; align-items: center; gap: 8px;
  background: var(--accent-soft); color: var(--accent-strong);
  font-size: .8rem; font-weight: 700; letter-spacing: 1.2px; text-transform: uppercase;
  padding: 6px 14px; border-radius: 999px; margin-bottom: 22px;
}
.hero h1 { font-size: clamp(2rem, 4.2vw, 3rem); line-height: 1.14; letter-spacing: -.5px; }
.hero h1 em { font-style: normal; color: var(--accent); }
.hero p.lead { margin-top: 20px; font-size: 1.08rem; color: var(--ink-soft); max-width: 640px; }
.hero-actions { margin-top: 30px; display: flex; gap: 14px; flex-wrap: wrap; }
.btn {
  display: inline-block; padding: 13px 26px; border-radius: 10px;
  font-weight: 600; font-size: 1rem; border: 1px solid transparent; cursor: pointer;
}
.btn-primary { background: var(--accent); color: #fff; box-shadow: 0 6px 18px rgba(10,110,138,.32); }
.btn-primary:hover { background: var(--accent-strong); transform: translateY(-1px); }
.btn-ghost { border-color: var(--line); color: var(--ink); background: #fff; }
.btn-ghost:hover { border-color: var(--accent); color: var(--accent); }
.hero-badges { margin-top: 32px; display: flex; gap: 12px; flex-wrap: wrap; }
.badge {
  display: inline-flex; align-items: center; gap: 7px;
  border: 1px solid var(--line); background: #fff;
  border-radius: 999px; padding: 7px 15px;
  font-size: .84rem; color: var(--ink-soft);
}
.badge b { color: var(--ink); }
.dot { width: 8px; height: 8px; border-radius: 50%; background: var(--green); display: inline-block; }

/* hero visual */
.hero-visual { position: relative; }
.hero-visual .hv-main {
  border-radius: 20px; overflow: hidden;
  box-shadow: var(--shadow-lg);
  border: 1px solid var(--line);
  background: linear-gradient(160deg, #ffffff, #eef6fa);
}
.hero-visual .hv-main img { width: 100%; }
.hv-chip {
  position: absolute; background: rgba(255,255,255,.96);
  border: 1px solid var(--line); border-radius: 12px;
  padding: 10px 16px; font-size: .8rem; font-weight: 600; color: var(--ink);
  box-shadow: var(--shadow); display: flex; align-items: center; gap: 8px;
}
.hv-chip .v { color: var(--accent-strong); font-weight: 800; }
.hv-chip.c1 { top: -16px; left: -18px; }
.hv-chip.c2 { bottom: -14px; right: -14px; }

/* ================= Stats strip ================= */
.stats-strip { border-bottom: 1px solid var(--line); background: #fff; }
.stats-grid { display: grid; grid-template-columns: repeat(4, 1fr); }
.stat { padding: 28px 20px; text-align: center; border-right: 1px solid var(--line); }
.stat:last-child { border-right: none; }
.stat .n { font-size: 1.7rem; font-weight: 800; color: var(--accent-strong); letter-spacing: -.5px; }
.stat .l { font-size: .82rem; color: var(--muted); margin-top: 4px; text-transform: uppercase; letter-spacing: 1px; }

/* ================= Sections ================= */
section.block { padding: 84px 0; }
section.block.alt { background: var(--bg-soft); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.kicker {
  font-size: .8rem; font-weight: 700; letter-spacing: 1.4px;
  text-transform: uppercase; color: var(--accent); margin-bottom: 12px;
  display: flex; align-items: center; gap: 10px;
}
.kicker::before { content: ""; width: 26px; height: 2px; background: var(--accent); border-radius: 2px; }
h2.title { font-size: clamp(1.55rem, 3vw, 2.1rem); letter-spacing: -.4px; max-width: 760px; }
p.sub { color: var(--muted); margin-top: 12px; max-width: 720px; }

/* ================= Cards / grids ================= */
.grid { display: grid; gap: 24px; margin-top: 48px; }
.grid.cols-2 { grid-template-columns: repeat(2, 1fr); }
.grid.cols-3 { grid-template-columns: repeat(3, 1fr); }
.grid.cols-4 { grid-template-columns: repeat(4, 1fr); }

.card {
  background: var(--bg-card); border: 1px solid var(--line);
  border-radius: var(--radius); padding: 30px;
  box-shadow: var(--shadow); position: relative;
  display: flex; flex-direction: column;
  transition: transform .18s ease, box-shadow .18s ease;
}
.card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); }
.card .num { font-size: .78rem; font-weight: 800; color: var(--accent); letter-spacing: 1px; margin-bottom: 14px; }
.card h3 { font-size: 1.16rem; margin-bottom: 10px; line-height: 1.35; }
.card p { color: var(--ink-soft); font-size: .95rem; }
.card ul { margin-top: 14px; padding-left: 18px; color: var(--ink-soft); font-size: .92rem; }
.card ul li { margin: 6px 0; }
.card .metrics { margin-top: auto; padding-top: 18px; display: flex; gap: 20px; flex-wrap: wrap; }
.metric .v { font-weight: 800; color: var(--accent-strong); font-size: 1.05rem; }
.metric .l { font-size: .78rem; color: var(--muted); }
.card .top-tag {
  position: absolute; top: 20px; right: 20px;
  background: var(--gold-soft); color: var(--gold);
  border: 1px solid #ecd9a8; font-size: .72rem; font-weight: 700;
  padding: 3px 10px; border-radius: 999px; letter-spacing: .4px;
}
.card a.more { margin-top: 16px; font-weight: 600; font-size: .92rem; }

/* product line card with image */
.pline-card { overflow: hidden; padding: 0; }
.pline-card .pl-img {
  background: linear-gradient(160deg, #f2f8fb, #e2eef5);
  border-bottom: 1px solid var(--line);
  display: flex; align-items: center; justify-content: center;
  padding: 26px;
}
.pline-card .pl-img img { height: 150px; width: auto; }
.pline-card .pl-body { padding: 26px 30px 30px; display: flex; flex-direction: column; flex: 1; }

/* ================= Product detail layout (products page) ================= */
.product-head { display: flex; align-items: flex-start; gap: 16px; flex-wrap: wrap; }
.product-tag {
  display: inline-block; background: var(--accent-soft); color: var(--accent-strong);
  border: 1px solid #bcdcea; font-size: .74rem; font-weight: 700;
  padding: 4px 12px; border-radius: 999px; letter-spacing: .6px; margin-left: 10px; vertical-align: 3px;
}
.product-tag.gold { background: var(--gold-soft); color: var(--gold); border-color: #ecd9a8; }

.pd-layout { display: grid; grid-template-columns: 420px 1fr; gap: 44px; margin-top: 44px; align-items: start; }

/* gallery */
.gallery { position: sticky; top: 92px; }
.gallery .g-main {
  border: 1px solid var(--line); border-radius: var(--radius);
  background: linear-gradient(160deg, #f6fafc, #e4eff5);
  box-shadow: var(--shadow);
  overflow: hidden; display: flex; align-items: center; justify-content: center;
  aspect-ratio: 4 / 3; padding: 22px;
}
.gallery .g-main img { max-height: 100%; width: auto; transition: opacity .15s ease; }
.g-thumbs { display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; margin-top: 12px; }
.g-thumbs button {
  border: 2px solid var(--line); border-radius: 10px; background: #fff;
  padding: 8px; cursor: pointer; display: flex; align-items: center; justify-content: center;
  aspect-ratio: 4 / 3; transition: border-color .15s ease;
}
.g-thumbs button img { max-height: 100%; }
.g-thumbs button.active, .g-thumbs button:hover { border-color: var(--accent); }
.g-note { margin-top: 10px; font-size: .78rem; color: var(--muted); text-align: center; }

/* right column content */
.pd-content h3.sub-h { font-size: 1.05rem; margin: 26px 0 10px; color: var(--accent-strong); }
.pd-content h3.sub-h:first-child { margin-top: 0; }
.pd-content ul.tick { list-style: none; padding: 0; }
.pd-content ul.tick li {
  padding: 8px 0 8px 30px; position: relative; color: var(--ink-soft);
  font-size: .95rem; border-bottom: 1px dashed var(--line);
}
.pd-content ul.tick li:last-child { border-bottom: none; }
.pd-content ul.tick li::before {
  content: "✓"; position: absolute; left: 4px; top: 8px;
  color: var(--green); font-weight: 800;
}
.pd-content ul.doc { list-style: none; padding: 0; }
.pd-content ul.doc li {
  padding: 8px 0 8px 30px; position: relative; color: var(--ink-soft);
  font-size: .95rem; border-bottom: 1px dashed var(--line);
}
.pd-content ul.doc li:last-child { border-bottom: none; }
.pd-content ul.doc li::before {
  content: "📄"; position: absolute; left: 2px; top: 7px; font-size: .9rem;
}
.pd-cta { margin-top: 28px; display: flex; gap: 12px; flex-wrap: wrap; }

/* ================= Tables ================= */
.table-wrap { overflow-x: auto; margin-top: 0; border: 1px solid var(--line); border-radius: var(--radius); background: #fff; box-shadow: var(--shadow); }
table { width: 100%; border-collapse: collapse; font-size: .93rem; min-width: 640px; }
th, td { text-align: left; padding: 14px 18px; border-bottom: 1px solid var(--line); vertical-align: top; }
th { background: var(--bg-soft); font-size: .8rem; text-transform: uppercase; letter-spacing: .8px; color: var(--ink-soft); }
tr:last-child td { border-bottom: none; }
td b { color: var(--accent-strong); }

/* ================= Steps ================= */
.steps { counter-reset: step; }
.step { display: flex; gap: 20px; padding: 24px 0; border-bottom: 1px dashed var(--line); }
.step:last-child { border-bottom: none; }
.step .n {
  flex: 0 0 46px; height: 46px; border-radius: 13px;
  background: linear-gradient(135deg, var(--accent), var(--teal));
  color: #fff; font-weight: 800; display: flex; align-items: center; justify-content: center;
  font-size: 1.05rem; box-shadow: 0 5px 14px rgba(10,110,138,.3);
}
.step h4 { font-size: 1.04rem; margin-bottom: 4px; }
.step p { color: var(--ink-soft); font-size: .94rem; }

/* ================= Split / panels ================= */
.split { display: grid; grid-template-columns: 1fr 1fr; gap: 48px; align-items: start; }
.panel { background: #fff; border: 1px solid var(--line); border-radius: var(--radius); padding: 30px; box-shadow: var(--shadow); }
.panel h3 { margin-bottom: 14px; font-size: 1.1rem; }
.panel ul.check, .panel ul.cross { list-style: none; padding: 0; }
.panel ul.check li, .panel ul.cross li {
  padding: 9px 0 9px 30px; position: relative; color: var(--ink-soft);
  font-size: .95rem; border-bottom: 1px dashed var(--line);
}
.panel ul.check li:last-child, .panel ul.cross li:last-child { border-bottom: none; }
.panel ul.check li::before { content: "✓"; position: absolute; left: 4px; top: 8px; color: var(--green); font-weight: 800; }
.panel ul.cross li::before { content: "—"; position: absolute; left: 6px; top: 8px; color: var(--danger); font-weight: 800; }

/* ================= Notices ================= */
.notice {
  margin-top: 36px; border-left: 4px solid var(--gold);
  background: var(--gold-soft); padding: 18px 22px; border-radius: 0 12px 12px 0;
  font-size: .92rem; color: #6a5a2e;
}
.notice.strong { border-left-color: var(--accent); background: var(--accent-soft); color: var(--accent-strong); }

/* ================= FAQ ================= */
details.faq { border: 1px solid var(--line); border-radius: 12px; background: #fff; margin-bottom: 12px; padding: 0 22px; box-shadow: var(--shadow); }
details.faq summary { cursor: pointer; font-weight: 600; padding: 18px 0; list-style: none; display: flex; justify-content: space-between; align-items: center; }
details.faq summary::-webkit-details-marker { display: none; }
details.faq summary::after { content: "+"; font-size: 1.3rem; color: var(--accent); font-weight: 400; }
details.faq[open] summary::after { content: "–"; }
details.faq .a { padding: 0 0 18px; color: var(--ink-soft); font-size: .95rem; }

/* ================= Form ================= */
.rfq { background: linear-gradient(180deg, var(--bg-soft), #fff); }
form.rfq-form {
  margin-top: 40px; background: #fff; border: 1px solid var(--line);
  border-radius: var(--radius); padding: 36px; box-shadow: var(--shadow);
  display: grid; grid-template-columns: 1fr 1fr; gap: 18px;
}
.field { display: flex; flex-direction: column; gap: 6px; }
.field.full { grid-column: 1 / -1; }
.field label { font-size: .85rem; font-weight: 600; color: var(--ink); }
.field label span { color: var(--danger); }
.field input, .field select, .field textarea {
  border: 1px solid var(--line); border-radius: 9px; padding: 11px 14px;
  font-size: .95rem; font-family: inherit; color: var(--ink); background: #fbfdfe;
}
.field input:focus, .field select:focus, .field textarea:focus { outline: 2px solid var(--accent-soft); border-color: var(--accent); }
.form-note { grid-column: 1 / -1; font-size: .82rem; color: var(--muted); }

/* ================= Footer ================= */
footer.site-footer { border-top: 1px solid var(--line); background: var(--bg-soft); padding: 52px 0 30px; }
.foot-grid { display: grid; grid-template-columns: 2fr 1fr 1fr; gap: 40px; }
.foot-grid h4 { font-size: .85rem; text-transform: uppercase; letter-spacing: 1px; color: var(--muted); margin-bottom: 14px; }
.foot-grid ul { list-style: none; }
.foot-grid li { margin: 8px 0; }
.foot-grid a { color: var(--ink-soft); font-size: .93rem; }
.foot-desc { color: var(--ink-soft); font-size: .93rem; max-width: 420px; }
.foot-legal {
  margin-top: 36px; padding-top: 20px; border-top: 1px solid var(--line);
  display: flex; justify-content: space-between; gap: 16px; flex-wrap: wrap;
  color: var(--muted); font-size: .82rem;
}

/* ================= Responsive ================= */
@media (max-width: 1000px) {
  .hero-grid { grid-template-columns: 1fr; }
  .hero-visual { max-width: 520px; margin: 0 auto; }
  .pd-layout { grid-template-columns: 1fr; }
  .gallery { position: static; }
}
@media (max-width: 900px) {
  .grid.cols-3, .grid.cols-4 { grid-template-columns: repeat(2, 1fr); }
  .split { grid-template-columns: 1fr; }
  .foot-grid { grid-template-columns: 1fr 1fr; }
  form.rfq-form { grid-template-columns: 1fr; }
  .nav-links { display: none; }
  .nav-links.open {
    display: flex; flex-direction: column; position: absolute;
    top: 68px; left: 0; right: 0; background: #fff;
    border-bottom: 1px solid var(--line); padding: 18px 24px; gap: 16px;
  }
  .menu-toggle {
    display: block; background: none; border: 1px solid var(--line);
    border-radius: 8px; padding: 8px 12px; font-size: 1rem; cursor: pointer; color: var(--ink);
  }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .stat:nth-child(2) { border-right: none; }
  .stat { border-bottom: 1px solid var(--line); }
  .stat:nth-child(n+3) { border-bottom: none; }
}
@media (max-width: 560px) {
  .grid.cols-2, .grid.cols-3, .grid.cols-4 { grid-template-columns: 1fr; }
  .hero { padding: 56px 0; }
}