/* ==========================================================================
   Zhongxin Steel — global styles
   Loaded after variables.css. Component-specific styles (product cards,
   spec tables, grade cross-reference, etc.) live in components.css once
   those templates are built.
   ========================================================================== */

/* ---- Reset ---- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-body);
  font-weight: 400;
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
/* Defensive full-bleed override — some hosting/plugin stacks apply a boxed
   max-width to html/body by default. Force this theme's sections back to
   edge-to-edge regardless of what else is loaded. */
html, body, #page.site, .site, .site-content, #content, .hfeed {
  width: 100% !important;
  max-width: 100% !important;
  margin: 0 !important;
  padding: 0 !important;
  box-sizing: border-box;
}
#page.site { display: block !important; }
img { max-width: 100%; height: auto; display: block; }
a { color: var(--color-navy); text-decoration: none; transition: color .2s ease; }
a:hover, a:focus { color: var(--color-gold); }
ul, ol { list-style: none; margin: 0; padding: 0; }
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  font-weight: 700;
  color: var(--color-navy);
  margin: 0 0 var(--space-sm) 0;
  line-height: 1.08;
}
table { border-collapse: collapse; width: 100%; }
button { font-family: inherit; cursor: pointer; }

.screen-reader-text {
  position: absolute !important;
  width: 1px; height: 1px;
  overflow: hidden;
  clip: rect(1px,1px,1px,1px);
  white-space: nowrap;
}
.skip-link {
  left: -9999px;
  top: 0;
  z-index: 100000;
  position: absolute;
}
.skip-link:focus {
  left: var(--space-sm);
  background: var(--color-gold);
  color: var(--color-navy);
  padding: 12px 20px;
  border-radius: var(--radius-sm);
  font-weight: 600;
}

/* ---- Layout helpers ---- */
.container {
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: var(--space-2xl);
}
.site { overflow-x: hidden; }
.site-content { background: var(--color-bg); }

/* ---- Buttons ---- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-family: var(--font-body);
  font-weight: 700;
  font-size: 15px;
  padding: 16px 32px;
  border-radius: var(--radius-sm);
  border: 1px solid transparent;
  white-space: nowrap;
}
.btn-primary {
  background: var(--color-gold);
  color: var(--color-navy);
}
.btn-primary:hover, .btn-primary:focus {
  background: #c1930f;
  color: var(--color-navy);
}
.btn-outline {
  border-color: rgba(245, 247, 250, 0.4);
  color: var(--color-bg);
}
.btn-outline:hover, .btn-outline:focus {
  border-color: var(--color-gold);
  color: var(--color-gold);
}
/* Same button, for use on white/light card surfaces instead of dark hero backgrounds. */
.btn-outline--on-light {
  border-color: var(--color-border);
  color: var(--color-navy);
}
.btn-outline--on-light:hover, .btn-outline--on-light:focus {
  border-color: var(--color-gold);
  color: var(--color-gold);
}

/* ==========================================================================
   Header / Primary Navigation
   ========================================================================== */
.site-header {
  background: var(--color-navy-dark);
  position: sticky;
  top: 0;
  z-index: 500;
  margin: 0;
  border: 0;
}
/* WP admin toolbar sits fixed at the very top while logged in — pin the
   sticky header just below it instead of at 0, or the two overlap/gap
   as the page scrolls. */
body.admin-bar .site-header { top: 32px; }
@media (max-width: 782px) {
  body.admin-bar .site-header { top: 46px; }
}
/* Belt-and-braces: nothing should ever introduce a gap between the header
   and the page's first section (hero), regardless of margin collapsing
   from content inside it. */
.site-main, .site-main > *:first-child { margin-top: 0 !important; }
.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-lg);
  min-height: var(--header-height);
  padding-block: var(--space-sm);
}
.site-branding { flex-shrink: 0; }
.site-logo {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 26px;
  letter-spacing: 0.5px;
  color: var(--color-bg);
}
.site-logo:hover { color: var(--color-bg); }
.site-logo .accent { color: var(--color-gold); }
.custom-logo-link img { max-height: 44px; width: auto; }

.main-navigation { flex: 1; }
.main-navigation .nav-menu {
  display: flex;
  align-items: center;
  gap: 36px;
  font-size: 15px;
  font-weight: 500;
}
.main-navigation .nav-menu > li { position: relative; }
.main-navigation .nav-menu > li > a {
  color: var(--color-nav-text);
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 0;
}
.main-navigation .nav-menu > li > a:hover,
.main-navigation .nav-menu > li.current-menu-item > a { color: var(--color-gold); }
.main-navigation .menu-item-has-children > a::after {
  content: '';
  width: 6px; height: 6px;
  border-right: 1.5px solid currentColor;
  border-bottom: 1.5px solid currentColor;
  transform: rotate(45deg);
  margin-top: -4px;
}
.main-navigation .sub-menu {
  position: absolute;
  top: 100%;
  left: 0;
  min-width: 260px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card-hover);
  padding: 10px;
  opacity: 0;
  visibility: hidden;
  transform: translateY(-6px);
  transition: opacity .2s ease, transform .2s ease, visibility .2s ease;
  z-index: 50;
}
.main-navigation .nav-menu > li:hover > .sub-menu,
.main-navigation .nav-menu > li.sub-menu-open > .sub-menu {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}
.main-navigation .sub-menu a {
  display: block;
  padding: 10px 14px;
  border-radius: var(--radius-sm);
  color: var(--color-navy);
  font-size: 14px;
  font-weight: 500;
}
.main-navigation .sub-menu a:hover { background: var(--color-chip-bg); color: var(--color-navy); }

.btn-cta { flex-shrink: 0; padding: 12px 26px; font-size: 14px; letter-spacing: 0.3px; }

.menu-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: transparent;
  border: none;
  padding: 8px;
}
.menu-toggle__bar {
  width: 24px; height: 2px;
  background: var(--color-bg);
  border-radius: 1px;
}

/* ==========================================================================
   Footer
   ========================================================================== */
.site-footer {
  background: var(--color-navy-dark);
  color: var(--color-nav-text);
}
.site-footer__columns {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1fr;
  gap: var(--space-xl);
  padding-block: var(--space-xl) var(--space-lg);
}
.footer-col__title {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 1.5px;
  color: var(--color-gold);
  margin-bottom: var(--space-sm);
  text-transform: uppercase;
}
.footer-col p { color: var(--color-nav-text); font-size: 14px; line-height: 1.6; }
.footer-col ul { display: flex; flex-direction: column; gap: 10px; }
.footer-col a { color: var(--color-nav-text); font-size: 14px; }
.footer-col a:hover { color: var(--color-gold); }
.footer-brand__name {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 22px;
  color: var(--color-bg);
  margin-bottom: var(--space-sm);
}
.footer-brand__name .accent { color: var(--color-gold); }
.site-footer__bottom {
  border-top: 1px solid rgba(245, 247, 250, 0.12);
  padding-block: var(--space-sm);
  font-size: 13px;
  color: #8fa0b5;
  text-align: center;
}
.back-to-top {
  position: fixed;
  right: 28px;
  bottom: 28px;
  z-index: 400;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--color-navy);
  border: 1px solid rgba(245, 247, 250, 0.2);
  box-shadow: var(--shadow-card-hover);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transform: translateY(8px);
  transition: opacity .25s ease, transform .25s ease, background .2s ease;
}
.back-to-top.is-visible { opacity: 1; visibility: visible; transform: translateY(0); }
.back-to-top:hover { background: var(--color-gold); }
.back-to-top:hover .back-to-top__arrow { border-color: var(--color-navy); }
.back-to-top__arrow {
  width: 10px; height: 10px;
  border-left: 2px solid var(--color-bg);
  border-top: 2px solid var(--color-bg);
  transform: rotate(45deg);
  margin-top: 4px;
}

/* ==========================================================================
   Responsive
   ========================================================================== */
@media (max-width: 1024px) {
  .container { padding-inline: 40px; }
  .site-footer__columns { grid-template-columns: 1fr 1fr; gap: var(--space-lg); }
}

@media (max-width: 767px) {
  .container { padding-inline: 20px; }

  .main-navigation {
    position: fixed;
    inset: var(--header-height) 0 0 0;
    background: var(--color-navy-dark);
    padding: var(--space-md) var(--space-sm);
    overflow-y: auto;
    transform: translateX(100%);
    transition: transform .25s ease;
    flex: unset;
  }
  .main-navigation.is-open { transform: translateX(0); }
  .main-navigation .nav-menu {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
  }
  .main-navigation .nav-menu > li { border-bottom: 1px solid rgba(245,247,250,0.1); }
  .main-navigation .nav-menu > li > a { padding: 16px 4px; width: 100%; justify-content: space-between; }
  .main-navigation .sub-menu {
    position: static;
    opacity: 1; visibility: visible; transform: none;
    display: none;
    background: transparent;
    border: none;
    box-shadow: none;
    padding: 0 0 10px 14px;
  }
  .main-navigation .nav-menu > li.sub-menu-open .sub-menu { display: block; }
  .main-navigation .sub-menu a { color: var(--color-nav-text); }
  .main-navigation .sub-menu a:hover { background: transparent; color: var(--color-gold); }

  .menu-toggle { display: inline-flex; }
  .btn-cta { padding: 10px 18px; font-size: 13px; }

  .site-footer__columns { grid-template-columns: 1fr; }
}