:root {
  --bg: #f5f7fa;
  --bg-alt: #eef1f5;
  --surface: #ffffff;
  --line: #e3e7ed;
  --line-strong: #cdd4de;
  --ink: #0f172a;
  --ink-soft: #334155;
  --ink-dim: #64748b;
  --navy: #0b2a4a;
  --navy-2: #143d6b;
  --amber: #d97706;
  --amber-2: #b45309;
  --radius: 6px;
  --maxw: 1360px;
}

* { padding: 0; margin: 0; box-sizing: border-box; }

html, body { height: 100%; }

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  font-size: 15px;
  line-height: 1.6;
  color: var(--ink);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

a { color: var(--navy); text-decoration: none; }
a:hover { color: var(--amber); }

/* Header */
.header {
  position: relative;
  padding: 44px 24px 32px;
  text-align: center;
  background: var(--surface);
  border-bottom: 1px solid var(--line);
  background-image:
    repeating-linear-gradient(90deg, transparent 0 39px, rgba(11,42,74,0.035) 39px 40px);
}

.header::before {
  content: "";
  position: absolute;
  left: 50%;
  top: 20px;
  transform: translateX(-50%);
  width: 36px;
  height: 2px;
  background: var(--amber);
}

.header-eyebrow {
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 2.2px;
  text-transform: uppercase;
  color: var(--amber);
  margin-bottom: 10px;
}

.header-title {
  font-size: clamp(24px, 3.2vw, 36px);
  line-height: 1.2;
  font-weight: 700;
  letter-spacing: -0.3px;
  color: var(--navy);
  max-width: 920px;
  margin: 0 auto;
}

.header-sub {
  margin: 12px auto 0;
  max-width: 680px;
  color: var(--ink-soft);
  font-size: clamp(14px, 1.2vw, 15px);
  line-height: 1.6;
}

.mail-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin: 20px auto 0;
  padding: 11px 22px;
  background: var(--amber);
  color: #fff;
  border: 1px solid var(--amber);
  border-radius: var(--radius);
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.6px;
  text-transform: uppercase;
  transition: background .2s ease, border-color .2s ease, transform .15s ease, box-shadow .2s ease;
  box-shadow: 0 1px 2px rgba(15,23,42,0.04);
}

.mail-btn:hover {
  background: var(--amber-2);
  border-color: var(--amber-2);
  color: #fff;
  transform: translateY(-1px);
  box-shadow: 0 6px 16px rgba(217,119,6,0.25);
}

/* Grid */
.container {
  display: grid;
  gap: 20px;
  grid-template-columns: repeat(4, 1fr);
  width: 100%;
  max-width: var(--maxw);
  margin: 28px auto 32px;
  padding: 0 24px;
}

/* Desktop — 4 cols (default, caps at 4 so 8 items always fill 2 full rows) */
/* Laptop / tablet landscape — 3 cols */
@media (max-width: 1200px) {
  .container { grid-template-columns: repeat(3, 1fr); }
}
/* Tablet portrait — 2 cols */
@media (max-width: 768px) {
  .container { grid-template-columns: repeat(2, 1fr); gap: 14px; padding: 0 16px; margin: 24px auto; }
  .header { padding: 48px 16px 36px; }
  .header::before { top: 22px; width: 32px; }
  .header-eyebrow { font-size: 11px; letter-spacing: 2px; margin-bottom: 10px; }
  .header-sub { margin-top: 14px; }
  .overlay { padding: 10px 12px 12px; font-size: 12.5px; min-height: 52px; }
}
/* Small phone — keep 2 cols but tighter */
@media (max-width: 480px) {
  .container { gap: 10px; padding: 0 12px; }
  .header { padding: 40px 14px 28px; }
  .header::before { top: 18px; }
  .header-eyebrow { font-size: 10px; letter-spacing: 1.6px; }
  .mail-btn { padding: 11px 20px; font-size: 13px; width: 100%; max-width: 320px; justify-content: center; }
  .overlay { padding: 9px 10px 10px; font-size: 12px; min-height: 46px; letter-spacing: 0; }
}

/* Product card — photo on white, part number as the heaviest element */
.prod-link {
  display: block;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  transition: border-color .2s ease, transform .2s ease, box-shadow .2s ease;
  box-shadow: 0 1px 2px rgba(15,23,42,0.03);
}

/* Square thumbnail: padding-top hack = bulletproof 1:1 regardless of image intrinsic size */
.prod-thumb {
  position: relative;
  display: block;
  width: 100%;
  padding-top: 100%;
  background: var(--bg-alt);
  overflow: hidden;
}

.prod-img {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.overlay {
  display: block;
  padding: 12px 14px 14px;
  color: var(--ink);
  font-size: 13px;
  line-height: 1.4;
  font-weight: 600;
  letter-spacing: 0.1px;
  border-top: 1px solid var(--line);
  background: var(--surface);
  word-break: break-word;
  min-height: 56px;
}

.prod-link:hover {
  border-color: var(--navy);
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(11,42,74,0.10), 0 2px 4px rgba(11,42,74,0.04);
}
.prod-link:hover .overlay { color: var(--navy); }

/* Pagination — wraps on narrow screens, scrolls if extreme */
.nav-btns {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 6px;
  flex-wrap: wrap;
  padding: 8px 24px 56px;
  max-width: 100%;
}

@media (max-width: 480px) {
  .nav-btns { gap: 4px; padding: 8px 12px 40px; }
  .nav-btns a { min-width: 36px; padding: 7px 10px; font-size: 12px; }
}

.nav-btns a {
  min-width: 42px;
  padding: 8px 14px;
  text-align: center;
  background: var(--surface);
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  color: var(--ink-soft);
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0.2px;
  transition: color .2s ease, border-color .2s ease, background .2s ease;
}

.nav-btns a:hover {
  color: var(--navy);
  border-color: var(--navy);
  background: #f0f4f9;
}

/* Footer */
.footer {
  margin-top: auto;
  padding: 24px 16px;
  background: var(--navy);
  border-top: 1px solid var(--line);
  color: #cbd5e1;
  font-size: 13px;
  line-height: 1.6;
  text-align: center;
}

.footer a { color: #fff; }
.footer a:hover { color: var(--amber); }
.footer .copyright { margin-bottom: 4px; letter-spacing: 0.4px; opacity: 0.8; }