/* Xin'an (Suzhou) Building Materials Co., Ltd. - Global stylesheet */
:root {
  --navy: #0e2a47;
  --navy-dark: #0a1f35;
  --blue: #1668b0;
  --orange: #f2711c;
  --orange-dark: #d95f10;
  --gray-50: #f6f8fa;
  --gray-100: #eef2f5;
  --gray-300: #d4dde5;
  --gray-600: #5a6b7b;
  --text: #1f2d3a;
  --white: #ffffff;
  --radius: 10px;
  --shadow: 0 4px 18px rgba(14, 42, 71, 0.08);
  --max-w: 1180px;
}

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

html { scroll-behavior: smooth; }

body {
  font-family: "Segoe UI", "Helvetica Neue", Arial, "PingFang SC", "Microsoft YaHei", sans-serif;
  color: var(--text);
  line-height: 1.65;
  background: var(--white);
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; display: block; }
a { color: var(--blue); text-decoration: none; }
a:hover { text-decoration: underline; }

.container { max-width: var(--max-w); margin: 0 auto; padding: 0 20px; }

/* ---------- Header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--navy);
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.25);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 10px 20px;
  max-width: var(--max-w);
  margin: 0 auto;
}
.brand { display: flex; align-items: center; gap: 12px; }
.brand img {
  width: 44px;
  height: 44px;
  background: #fff;
  border-radius: 8px;
  padding: 3px;
}
.brand-text { line-height: 1.2; }
.brand-text .brand-name {
  color: #fff;
  font-weight: 700;
  font-size: 17px;
  letter-spacing: 0.3px;
  display: block;
}
.brand-text .brand-tag {
  color: #9fb8cc;
  font-size: 11.5px;
  display: block;
}
.main-nav { display: flex; align-items: center; gap: 4px; }
.main-nav a {
  color: #dce7f0;
  padding: 10px 14px;
  font-size: 15px;
  border-radius: 6px;
}
.main-nav a:hover { background: rgba(255, 255, 255, 0.12); text-decoration: none; color: #fff; }
.main-nav a.active { color: #fff; background: rgba(255, 255, 255, 0.16); font-weight: 600; }
.nav-cta {
  background: var(--orange) !important;
  color: #fff !important;
  font-weight: 600;
  margin-left: 8px;
}
.nav-cta:hover { background: var(--orange-dark) !important; }
.nav-toggle {
  display: none;
  background: none;
  border: 1px solid rgba(255, 255, 255, 0.4);
  color: #fff;
  font-size: 20px;
  border-radius: 6px;
  padding: 4px 10px;
  cursor: pointer;
}

/* ---------- Hero ---------- */
.hero {
  background: linear-gradient(115deg, var(--navy-dark) 0%, var(--navy) 55%, #144a75 100%);
  color: #fff;
  padding: 84px 0 72px;
}
.hero .container { display: grid; grid-template-columns: 1.25fr 1fr; gap: 48px; align-items: center; }
.hero-eyebrow {
  display: inline-block;
  background: rgba(242, 113, 28, 0.18);
  border: 1px solid rgba(242, 113, 28, 0.6);
  color: #ffb380;
  font-size: 13px;
  font-weight: 600;
  padding: 5px 14px;
  border-radius: 999px;
  margin-bottom: 18px;
  letter-spacing: 0.4px;
}
.hero h1 { font-size: 40px; line-height: 1.25; margin-bottom: 18px; }
.hero h1 .accent { color: var(--orange); }
.hero p.lead { font-size: 17.5px; color: #c9d8e4; max-width: 560px; margin-bottom: 28px; }
.hero-actions { display: flex; gap: 14px; flex-wrap: wrap; margin-bottom: 34px; }
.hero-panel {
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.14);
  border-radius: 14px;
  padding: 26px 28px;
}
.hero-panel h2 { font-size: 17px; margin-bottom: 14px; color: #ffd9bd; }
.hero-panel ul { list-style: none; }
.hero-panel li {
  padding: 9px 0 9px 30px;
  position: relative;
  color: #d5e2ec;
  font-size: 15px;
  border-bottom: 1px dashed rgba(255, 255, 255, 0.12);
}
.hero-panel li:last-child { border-bottom: none; }
.hero-panel li::before {
  content: "";
  position: absolute;
  left: 2px;
  top: 14px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--orange);
  box-shadow: inset 0 0 0 3px rgba(255, 255, 255, 0.55);
}
.trust-badges { display: flex; flex-wrap: wrap; gap: 10px; }
.trust-badges span {
  border: 1px solid rgba(255, 255, 255, 0.35);
  color: #e6eef5;
  font-size: 12.5px;
  padding: 5px 12px;
  border-radius: 999px;
  letter-spacing: 0.3px;
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-block;
  padding: 12px 26px;
  border-radius: 8px;
  font-weight: 600;
  font-size: 15.5px;
  transition: all 0.2s ease;
  border: 2px solid transparent;
}
.btn-primary { background: var(--orange); color: #fff; }
.btn-primary:hover { background: var(--orange-dark); text-decoration: none; }
.btn-outline { border-color: #fff; color: #fff; }
.btn-outline:hover { background: rgba(255, 255, 255, 0.12); text-decoration: none; }
.btn-blue { background: var(--blue); color: #fff; }
.btn-blue:hover { background: #115592; text-decoration: none; }

/* ---------- Sections ---------- */
.section { padding: 72px 0; }
.section-alt { background: var(--gray-50); }
.section-head { text-align: center; max-width: 760px; margin: 0 auto 46px; }
.section-kicker {
  color: var(--orange);
  font-weight: 700;
  font-size: 13px;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  margin-bottom: 8px;
}
.section-head h2 { font-size: 30px; color: var(--navy); margin-bottom: 12px; }
.section-head p { color: var(--gray-600); font-size: 16px; }

/* ---------- Cards ---------- */
.card-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.card {
  background: #fff;
  border: 1px solid var(--gray-100);
  border-radius: var(--radius);
  padding: 28px 26px;
  box-shadow: var(--shadow);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
  display: flex;
  flex-direction: column;
}
.card:hover { transform: translateY(-4px); box-shadow: 0 10px 28px rgba(14, 42, 71, 0.13); }
.card-icon {
  width: 52px;
  height: 52px;
  border-radius: 12px;
  background: linear-gradient(135deg, var(--navy), var(--blue));
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 24px;
  margin-bottom: 16px;
}
.card h3 { font-size: 18.5px; color: var(--navy); margin-bottom: 8px; }
.card p { color: var(--gray-600); font-size: 14.5px; flex: 1; }
.card .card-link { margin-top: 14px; font-weight: 600; font-size: 14.5px; }

/* ---------- Feature list (why us) ---------- */
.feature-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 26px; }
.feature {
  display: flex;
  gap: 18px;
  background: #fff;
  border-radius: var(--radius);
  border: 1px solid var(--gray-100);
  padding: 24px;
  box-shadow: var(--shadow);
}
.feature-num {
  flex: 0 0 46px;
  height: 46px;
  border-radius: 50%;
  background: var(--orange);
  color: #fff;
  font-weight: 700;
  font-size: 19px;
  display: flex;
  align-items: center;
  justify-content: center;
}
.feature h3 { color: var(--navy); font-size: 17.5px; margin-bottom: 6px; }
.feature p { color: var(--gray-600); font-size: 14.5px; }

/* ---------- Certifications ---------- */
.cert-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.cert {
  background: #fff;
  border-left: 4px solid var(--orange);
  border-radius: 8px;
  padding: 18px 20px;
  box-shadow: var(--shadow);
}
.cert strong { display: block; color: var(--navy); font-size: 15.5px; margin-bottom: 4px; }
.cert span { color: var(--gray-600); font-size: 13.5px; }

/* ---------- Markets ---------- */
.markets { background: linear-gradient(120deg, var(--navy-dark), var(--navy)); color: #fff; }
.markets .section-head h2 { color: #fff; }
.markets .section-head p { color: #b9cbd9; }
.market-grid { display: grid; grid-template-columns: repeat(5, 1fr); gap: 16px; }
.market {
  background: rgba(255, 255, 255, 0.07);
  border: 1px solid rgba(255, 255, 255, 0.15);
  border-radius: var(--radius);
  padding: 20px 16px;
  text-align: center;
}
.market .m-icon { font-size: 26px; margin-bottom: 8px; }
.market strong { display: block; font-size: 15.5px; margin-bottom: 4px; }
.market span { font-size: 12.5px; color: #aec3d4; }

/* ---------- FAQ ---------- */
.faq-item {
  background: #fff;
  border: 1px solid var(--gray-100);
  border-radius: var(--radius);
  margin-bottom: 14px;
  box-shadow: var(--shadow);
  overflow: hidden;
}
.faq-item summary {
  cursor: pointer;
  padding: 18px 22px;
  font-weight: 600;
  color: var(--navy);
  font-size: 16px;
  list-style: none;
  position: relative;
}
.faq-item summary::after {
  content: "+";
  position: absolute;
  right: 22px;
  top: 16px;
  font-size: 22px;
  color: var(--orange);
}
.faq-item[open] summary::after { content: "-"; }
.faq-item .faq-a { padding: 0 22px 20px; color: var(--gray-600); font-size: 15px; }

/* ---------- Product tables ---------- */
.product-category { margin-bottom: 56px; scroll-margin-top: 90px; }
.product-category h2 {
  color: var(--navy);
  font-size: 24px;
  padding-bottom: 10px;
  border-bottom: 3px solid var(--orange);
  margin-bottom: 8px;
}
.product-category .cat-desc { color: var(--gray-600); margin-bottom: 20px; font-size: 15px; max-width: 860px; }
.product-table { width: 100%; border-collapse: collapse; background: #fff; box-shadow: var(--shadow); border-radius: var(--radius); overflow: hidden; }
.product-table th {
  background: var(--navy);
  color: #fff;
  text-align: left;
  padding: 12px 16px;
  font-size: 14px;
  letter-spacing: 0.3px;
}
.product-table td {
  padding: 12px 16px;
  border-bottom: 1px solid var(--gray-100);
  font-size: 14.5px;
  vertical-align: top;
}
.product-table tr:nth-child(even) td { background: var(--gray-50); }
.product-table td.pname { font-weight: 600; color: var(--navy); }
.tag {
  display: inline-block;
  background: #fff3e8;
  color: var(--orange-dark);
  border: 1px solid #ffd9b8;
  font-size: 12px;
  padding: 1px 8px;
  border-radius: 999px;
  margin-left: 6px;
  white-space: nowrap;
}

/* ---------- Page hero (sub pages) ---------- */
.page-hero {
  background: linear-gradient(115deg, var(--navy-dark), var(--navy) 60%, #144a75);
  color: #fff;
  padding: 56px 0;
}
.page-hero h1 { font-size: 34px; margin-bottom: 10px; }
.page-hero p { color: #c9d8e4; max-width: 780px; font-size: 16.5px; }
.breadcrumb { font-size: 13.5px; color: #9fb8cc; margin-bottom: 14px; }
.breadcrumb a { color: #cfe0ec; }

/* ---------- Contact ---------- */
.contact-grid { display: grid; grid-template-columns: 1fr 1.2fr; gap: 40px; }
.contact-info-card {
  background: var(--navy);
  color: #fff;
  border-radius: var(--radius);
  padding: 32px;
}
.contact-info-card h2 { font-size: 22px; margin-bottom: 20px; }
.contact-line { display: flex; gap: 14px; padding: 12px 0; border-bottom: 1px dashed rgba(255, 255, 255, 0.18); }
.contact-line:last-child { border-bottom: none; }
.contact-line .ci { font-size: 20px; }
.contact-line strong { display: block; font-size: 13px; color: #9fb8cc; text-transform: uppercase; letter-spacing: 0.8px; }
.contact-line a { color: #ffd9bd; }
.form-card { background: #fff; border-radius: var(--radius); box-shadow: var(--shadow); border: 1px solid var(--gray-100); padding: 32px; }
.form-card h2 { color: var(--navy); font-size: 22px; margin-bottom: 6px; }
.form-card .form-sub { color: var(--gray-600); font-size: 14.5px; margin-bottom: 22px; }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.form-group { margin-bottom: 16px; }
.form-group label { display: block; font-weight: 600; font-size: 14px; color: var(--navy); margin-bottom: 6px; }
.form-group input, .form-group textarea, .form-group select {
  width: 100%;
  padding: 11px 14px;
  border: 1px solid var(--gray-300);
  border-radius: 8px;
  font-size: 15px;
  font-family: inherit;
}
.form-group input:focus, .form-group textarea:focus, .form-group select:focus {
  outline: none;
  border-color: var(--blue);
  box-shadow: 0 0 0 3px rgba(22, 104, 176, 0.15);
}

/* ---------- CTA band ---------- */
.cta-band {
  background: linear-gradient(100deg, var(--orange), var(--orange-dark));
  color: #fff;
  padding: 52px 0;
  text-align: center;
}
.cta-band h2 { font-size: 27px; margin-bottom: 10px; }
.cta-band p { max-width: 640px; margin: 0 auto 24px; color: #fff3e6; }
.cta-band .btn { background: #fff; color: var(--orange-dark); }
.cta-band .btn:hover { background: #f1f1f1; }

/* ---------- Footer ---------- */
.site-footer { background: var(--navy-dark); color: #b9cbd9; padding: 56px 0 0; }
.footer-grid { display: grid; grid-template-columns: 1.4fr 1fr 1fr 1.2fr; gap: 36px; padding-bottom: 40px; }
.footer-grid h3 { color: #fff; font-size: 16px; margin-bottom: 14px; }
.footer-grid ul { list-style: none; }
.footer-grid li { margin-bottom: 8px; font-size: 14px; }
.footer-grid a { color: #b9cbd9; }
.footer-grid a:hover { color: #fff; }
.footer-brand { display: flex; align-items: center; gap: 10px; margin-bottom: 14px; }
.footer-brand img { width: 40px; height: 40px; background: #fff; border-radius: 8px; padding: 3px; }
.footer-brand strong { color: #fff; font-size: 15px; }
.footer-desc { font-size: 13.5px; line-height: 1.7; }
.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding: 18px 0;
  font-size: 13px;
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 8px;
}

/* ---------- About page ---------- */
.about-grid { display: grid; grid-template-columns: 1.3fr 1fr; gap: 44px; align-items: start; }
.about-text h2 { color: var(--navy); font-size: 24px; margin: 26px 0 10px; }
.about-text h2:first-child { margin-top: 0; }
.about-text p { margin-bottom: 14px; color: #3c4c5c; font-size: 15.5px; }
.stat-panel { background: var(--navy); color: #fff; border-radius: var(--radius); padding: 30px; }
.stat-panel h2 { font-size: 19px; margin-bottom: 18px; color: #ffd9bd; }
.stat { padding: 14px 0; border-bottom: 1px dashed rgba(255, 255, 255, 0.16); }
.stat:last-child { border-bottom: none; }
.stat .stat-num { font-size: 30px; font-weight: 700; color: var(--orange); }
.stat .stat-label { font-size: 14px; color: #c9d8e4; }

/* ---------- Misc ---------- */
.two-col { display: grid; grid-template-columns: 1fr 1fr; gap: 40px; align-items: center; }
.note-box {
  background: #fff8f1;
  border: 1px solid #ffd9b8;
  border-radius: var(--radius);
  padding: 18px 22px;
  color: #7a4a1d;
  font-size: 14.5px;
}

/* ---------- Responsive ---------- */
@media (max-width: 960px) {
  .hero .container { grid-template-columns: 1fr; }
  .card-grid { grid-template-columns: repeat(2, 1fr); }
  .market-grid { grid-template-columns: repeat(3, 1fr); }
  .cert-grid { grid-template-columns: repeat(2, 1fr); }
  .contact-grid, .about-grid, .two-col { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 720px) {
  .nav-toggle { display: block; }
  .main-nav {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--navy-dark);
    flex-direction: column;
    align-items: stretch;
    padding: 10px;
  }
  .main-nav.open { display: flex; }
  .main-nav a { padding: 13px 16px; }
  .nav-cta { margin: 8px 0 4px; text-align: center; }
  .hero { padding: 56px 0; }
  .hero h1 { font-size: 29px; }
  .card-grid, .feature-grid, .cert-grid, .market-grid { grid-template-columns: 1fr; }
  .form-row { grid-template-columns: 1fr; }
  .section { padding: 52px 0; }
  .section-head h2 { font-size: 24px; }
  .product-table { display: block; overflow-x: auto; }
}