/* =====================================================================
   siteF — mahjongsupplier.com (MahjongSupplier / B2B supply partner)
   Palette: steel navy + copper · trust-grade procurement look
   ===================================================================== */
:root {
  --navy: #1d3a5f;
  --navy-2: #142a46;
  --ink: #1b2632;
  --muted: #5a6673;
  --copper: #b06a2c;
  --copper-2: #8f5520;
  --line: #dce1e8;
  --bg: #f3f5f8;
  --paper: #ffffff;
}
* { margin: 0; padding: 0; box-sizing: border-box; }
body { font-family: -apple-system, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif; background: var(--bg); color: var(--ink); line-height: 1.6; font-size: 16px; }
img { max-width: 100%; display: block; }
a { color: var(--navy); text-decoration: none; }
a:hover { color: var(--copper-2); }
.container { max-width: 1200px; margin: 0 auto; padding: 0 22px; }

/* topstrip */
.topstrip { background: var(--navy-2); color: #c6d2e0; font-size: 13px; text-align: center; padding: 8px 16px; letter-spacing: .02em; }

/* header */
header.site { background: var(--paper); border-bottom: 3px solid var(--copper); position: sticky; top: 0; z-index: 50; }
.nav { display: flex; align-items: center; justify-content: space-between; padding: 13px 0; gap: 18px; }
.brand { display: flex; align-items: center; gap: 12px; }
.brand .logo { width: 44px; height: 44px; border-radius: 8px; }
.brand .name { font-size: 19px; font-weight: 800; letter-spacing: .01em; color: var(--ink); line-height: 1.15; }
.brand .name em { font-style: normal; color: var(--copper); }
.brand .name small { display: block; font-size: 10.5px; font-weight: 700; color: var(--muted); letter-spacing: .16em; text-transform: uppercase; }
nav.main ul { list-style: none; display: flex; gap: 24px; }
nav.main a { font-size: 14.5px; font-weight: 600; color: var(--ink); padding: 6px 2px; border-bottom: 2px solid transparent; }
nav.main a:hover, nav.main a.active { color: var(--navy); border-bottom-color: var(--copper); }
.nav-toggle { display: none; background: none; border: 1px solid var(--line); padding: 8px 12px; cursor: pointer; font-size: 18px; }

/* hero */
.hero { background: linear-gradient(140deg, rgba(20,42,70,.95), rgba(29,58,95,.88)), var(--navy-2); color: #fff; padding: 72px 0 80px; }
.hero .wrap { display: grid; grid-template-columns: 1.25fr .85fr; gap: 46px; align-items: center; }
.kicker { display: inline-block; background: var(--copper); color: #fff; font-size: 12px; font-weight: 700; letter-spacing: .14em; text-transform: uppercase; padding: 6px 14px; margin-bottom: 18px; }
.hero h1 { font-size: clamp(29px, 3.8vw, 44px); line-height: 1.18; margin-bottom: 16px; }
.hero .lead { font-size: 17.5px; color: #cdd9e5; max-width: 60ch; margin-bottom: 30px; }
.hero .btns { display: flex; gap: 14px; flex-wrap: wrap; }
.hero-art { position: relative; }
.hero-art img { border-radius: 4px; border: 1px solid rgba(255,255,255,.25); box-shadow: 0 24px 60px rgba(0,0,0,.35); }

/* quote card */
.quote-card { background: var(--paper); color: var(--ink); border-radius: 4px; padding: 24px 26px; border-top: 4px solid var(--copper); box-shadow: 0 24px 60px rgba(0,0,0,.3); }
.quote-card h3 { font-size: 15px; text-transform: uppercase; letter-spacing: .12em; color: var(--navy); margin-bottom: 12px; }
.quote-card ul { list-style: none; }
.quote-card li { font-size: 14.5px; padding: 7px 0 7px 22px; position: relative; border-bottom: 1px dashed var(--line); }
.quote-card li:last-child { border-bottom: 0; }
.quote-card li::before { content: '\2713'; position: absolute; left: 0; top: 8px; color: var(--copper); font-size: 11px; font-weight: 800; }

/* buttons */
.btn { display: inline-block; padding: 13px 28px; font-weight: 700; font-size: 15px; transition: .2s; border: 2px solid transparent; cursor: pointer; }
.btn.primary { background: var(--copper); color: #fff; }
.btn.primary:hover { background: var(--copper-2); color: #fff; }
.btn.line { border-color: #fff; color: #fff; }
.btn.line:hover { background: #fff; color: var(--navy-2); }
.btn.ghost { border-color: var(--navy); color: var(--navy); background: transparent; }
.btn.ghost:hover { background: var(--navy); color: #fff; }

/* stats band */
.stats-band { background: var(--paper); border-bottom: 1px solid var(--line); }
.stats-band .container { display: grid; grid-template-columns: repeat(4, 1fr); }
.stat { text-align: center; padding: 26px 12px; border-left: 1px solid var(--line); }
.stat:first-child { border-left: 0; }
.stat .n { font-size: 30px; font-weight: 800; color: var(--navy); }
.stat .l { font-size: 12px; letter-spacing: .1em; text-transform: uppercase; color: var(--muted); margin-top: 4px; }

/* blocks & section heads */
.block { padding: 64px 0; }
.block.tint { background: var(--paper); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.s-head { display: flex; justify-content: space-between; align-items: flex-end; gap: 30px; margin-bottom: 34px; }
.s-head .kicker { background: var(--navy); }
.s-head h2 { font-size: clamp(24px, 3vw, 33px); line-height: 1.2; margin-bottom: 8px; }
.s-head p { color: var(--muted); max-width: 66ch; }

/* pillars */
.pillars { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
.pillar { background: var(--paper); border: 1px solid var(--line); border-bottom: 3px solid var(--copper); padding: 26px 24px; }
.pillar .glyph { font-size: 12px; font-weight: 800; letter-spacing: .16em; color: var(--navy); margin-bottom: 10px; }
.pillar h3 { font-size: 18px; margin-bottom: 8px; }
.pillar p { font-size: 14.5px; color: var(--muted); }

/* cards */
.cards { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
.card { background: var(--paper); border: 1px solid var(--line); transition: .2s; display: flex; flex-direction: column; }
.card:hover { border-color: var(--navy); box-shadow: 0 14px 34px rgba(29,58,95,.13); }
.card .ph { display: block; overflow: hidden; }
.card .ph img { width: 100%; aspect-ratio: 1; object-fit: cover; transition: .3s; }
.card:hover .ph img { transform: scale(1.04); }
.card .body { padding: 16px 18px 20px; }
.card h3 { font-size: 15.5px; line-height: 1.4; margin-bottom: 8px; }
.card h3 a { color: var(--ink); }
.card h3 a:hover { color: var(--navy); }
.card .price { font-weight: 800; color: var(--navy); font-size: 16px; }
.card .moq { font-size: 13px; color: var(--muted); margin-top: 2px; }
.tagrow { margin-top: 10px; display: flex; gap: 6px; flex-wrap: wrap; }
.tag { font-size: 11px; font-weight: 700; letter-spacing: .06em; text-transform: uppercase; background: #e5ebf3; color: var(--navy-2); padding: 3px 9px; border-radius: 3px; }

/* page head + crumbs */
.crumb { font-size: 13px; color: var(--muted); padding: 18px 0 0; }
.crumb a { color: var(--navy); }
.page-head { padding: 18px 0 30px; }
.page-head h1 { font-size: clamp(26px, 3.4vw, 38px); line-height: 1.2; margin-bottom: 10px; }
.page-head p { color: var(--muted); max-width: 76ch; font-size: 16.5px; }

/* pagination */
.pagination { display: flex; gap: 8px; padding: 34px 0 10px; }
.pagination a, .pagination span { display: inline-block; min-width: 42px; text-align: center; padding: 10px 12px; border: 1px solid var(--line); background: var(--paper); font-weight: 700; }
.pagination span.cur { background: var(--navy); color: #fff; border-color: var(--navy); }

/* caps (numbered blocks / steps) */
.caps { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.cap { background: var(--paper); border: 1px solid var(--line); padding: 24px; position: relative; }
.cap .no { font-size: 12px; font-weight: 800; letter-spacing: .16em; color: var(--copper); margin-bottom: 10px; }
.cap h3 { font-size: 17.5px; margin-bottom: 8px; }
.cap p { font-size: 14.5px; color: var(--muted); }

/* attribute table */
table.attrs { width: 100%; border-collapse: collapse; background: var(--paper); border: 1px solid var(--line); margin: 18px 0; }
table.attrs th, table.attrs td { padding: 11px 16px; border: 1px solid var(--line); font-size: 14.5px; text-align: left; vertical-align: top; }
table.attrs th { background: #eaeef4; width: 34%; color: var(--navy-2); font-weight: 700; }

/* product page */
.pd { display: grid; grid-template-columns: minmax(0,5fr) minmax(0,4fr); gap: 40px; padding: 26px 0 10px; }
.gallery .main img { width: 100%; border: 1px solid var(--line); background: #fff; }
.thumbs { display: grid; grid-template-columns: repeat(6, 1fr); gap: 8px; margin-top: 10px; }
.thumbs img { width: 100%; aspect-ratio: 1; object-fit: cover; border: 1px solid var(--line); cursor: pointer; opacity: .75; }
.thumbs img.cur, .thumbs img:hover { opacity: 1; border-color: var(--navy); }
.pd-info h1 { font-size: clamp(22px, 2.6vw, 30px); line-height: 1.25; margin-bottom: 12px; }
.pd-price { font-size: 26px; font-weight: 800; color: var(--navy); margin-bottom: 16px; }
.pd-price small { font-size: 14px; color: var(--muted); font-weight: 600; }
ul.spec { list-style: none; border: 1px solid var(--line); background: var(--paper); margin-bottom: 18px; }
ul.spec li { display: flex; justify-content: space-between; gap: 14px; padding: 10px 16px; border-bottom: 1px solid var(--line); font-size: 14.5px; }
ul.spec li:last-child { border-bottom: 0; }
ul.spec span { color: var(--muted); }
ul.spec b { text-align: right; }
.cta-row { display: flex; gap: 12px; flex-wrap: wrap; margin: 6px 0 14px; }
.variants { display: flex; gap: 8px; flex-wrap: wrap; }
.variants .sw img { width: 52px; height: 52px; object-fit: cover; border: 1px solid var(--line); cursor: pointer; }
.variants .sw img:hover { border-color: var(--copper); }
.desc-section { padding: 30px 0 20px; max-width: 980px; }
.desc-section h2 { font-size: 24px; margin: 30px 0 14px; border-left: 4px solid var(--copper); padding-left: 12px; }
ul.bullets { margin: 0 0 18px 20px; }
ul.bullets li { margin-bottom: 8px; font-size: 15px; color: #33404d; }
.desc-imgs { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; margin: 18px 0; }
.desc-imgs img { width: 100%; border: 1px solid var(--line); }

/* inquiry form */
.form-wrap { display: grid; grid-template-columns: minmax(0,1fr) minmax(0,1.6fr); gap: 34px; padding-bottom: 60px; align-items: start; }
.info-card { background: var(--paper); border: 1px solid var(--line); border-bottom: 3px solid var(--navy); padding: 24px; font-size: 15px; }
.info-card h3 { margin-bottom: 12px; }
.info-card p { margin-bottom: 10px; color: var(--muted); }
.info-card b { color: var(--ink); }
form.inquiry { background: var(--paper); border: 1px solid var(--line); padding: 28px; }
.grid2 { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
.field { margin-bottom: 18px; }
.field label { display: block; font-size: 13.5px; font-weight: 700; margin-bottom: 6px; }
.field .req { color: #c0392b; }
.field input, .field select, .field textarea { width: 100%; padding: 11px 13px; border: 1px solid var(--line); font-size: 15px; font-family: inherit; background: #fff; }
.field input:focus, .field select:focus, .field textarea:focus { outline: 2px solid var(--navy); border-color: var(--navy); }
.hp { position: absolute; left: -9999px; }
.err-note { background: #fdecea; border: 1px solid #f5c6c0; color: #96281b; padding: 12px 16px; margin-bottom: 16px; font-size: 14.5px; }

/* FAQ */
details.faq { background: var(--paper); border: 1px solid var(--line); margin-bottom: 10px; }
details.faq summary { cursor: pointer; font-weight: 700; padding: 15px 18px; font-size: 15.5px; list-style-position: inside; }
details.faq .a { padding: 0 18px 16px 34px; color: var(--muted); font-size: 15px; }

/* OEM band */
.oem-band { background: linear-gradient(120deg, var(--navy-2), var(--navy)); color: #fff; padding: 58px 0; border-bottom: 4px solid var(--copper); }
.oem-band .inner { display: flex; align-items: center; justify-content: space-between; gap: 40px; flex-wrap: wrap; }
.oem-band h2 { font-size: clamp(22px, 2.8vw, 30px); max-width: 26ch; margin-bottom: 10px; }
.oem-band p { color: #cdd9e5; max-width: 62ch; }
.oem-band .btns { display: flex; gap: 12px; flex-wrap: wrap; }

/* footer */
footer.site { background: var(--navy-2); color: #b6c5d6; margin-top: 70px; }
footer.site h4 { color: #fff; font-size: 14px; letter-spacing: .12em; text-transform: uppercase; margin-bottom: 14px; }
footer.site .cols { display: grid; grid-template-columns: 1.6fr 1fr 1fr 1fr; gap: 34px; padding: 46px 22px 30px; }
footer.site .cols a { display: block; color: #b6c5d6; font-size: 14px; padding: 4px 0; }
footer.site .cols a:hover { color: var(--copper); }
footer.site .legal { display: flex; justify-content: space-between; gap: 14px; flex-wrap: wrap; border-top: 1px solid rgba(255,255,255,.14); padding: 16px 22px; font-size: 13px; color: #8296ac; }

/* responsive */
@media (max-width: 980px) {
  nav.main { display: none; }
  .nav-toggle { display: block; }
  body.nav-open nav.main { display: block; position: absolute; top: 100%; left: 0; right: 0; background: var(--paper); border-bottom: 1px solid var(--line); padding: 10px 22px 16px; }
  body.nav-open nav.main ul { flex-direction: column; gap: 4px; }
  .hero .wrap { grid-template-columns: 1fr; }
  .pillars, .cards { grid-template-columns: repeat(2, 1fr); }
  .caps { grid-template-columns: 1fr 1fr; }
  .stats-band .container { grid-template-columns: repeat(2, 1fr); }
  .stat:nth-child(3) { border-left: 0; }
  .form-wrap { grid-template-columns: 1fr; }
  .pd { grid-template-columns: 1fr; }
  footer.site .cols { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 620px) {
  .pillars, .cards, .caps, .grid2, .desc-imgs { grid-template-columns: 1fr; }
  .stats-band .container { grid-template-columns: 1fr; }
  .stat { border-left: 0; border-top: 1px solid var(--line); }
  .s-head { flex-direction: column; align-items: flex-start; }
}