/* ============================================================
   Qingdao Triton Global Precision Metals — site stylesheet
   Bold industrial / blueprint theme
   ============================================================ */

:root {
  --ink: #12181f;
  --ink-soft: #4a5661;
  --graphite-950: #0a0f16;
  --graphite-900: #0f1720;
  --graphite-800: #16212c;
  --steel-700: #1e3a5c;
  --steel-500: #2f6ea6;
  --steel-100: #eaf1f8;
  --amber: #e0862a;
  --amber-dark: #b8681a;
  --amber-glow: rgba(224, 134, 42, 0.35);
  --bg: #ffffff;
  --bg-alt: #f4f6f8;
  --border: #dfe4ea;
  --border-dark: rgba(255, 255, 255, 0.12);
  --radius-sm: 2px;
  --cut: 14px;
  --shadow: 0 20px 44px rgba(10, 15, 22, 0.16);
  --shadow-sm: 0 3px 12px rgba(10, 15, 22, 0.08);
  --font-body: "Inter", system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-head: "Space Grotesk", "Inter", system-ui, sans-serif;
  --wrap: 1200px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--font-body);
  color: var(--ink);
  background: var(--bg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; display: block; height: auto; }
a { color: var(--steel-500); text-decoration: none; }
a:hover { color: var(--amber); }
h1, h2, h3 { font-family: var(--font-head); color: var(--graphite-900); line-height: 1.15; margin: 0 0 0.5em; letter-spacing: -0.01em; }
p { margin: 0 0 1em; color: var(--ink-soft); }

.wrap { max-width: var(--wrap); margin: 0 auto; padding: 0 24px; position: relative; z-index: 1; }
.sr-only {
  position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; border: 0;
}
.skip-link {
  position: absolute; left: -9999px; top: 0; background: var(--graphite-900); color: #fff;
  padding: 10px 16px; z-index: 200;
}
.skip-link:focus { left: 0; }

/* Buttons — angular, clipped corner */
.btn {
  display: inline-flex; align-items: center; justify-content: center;
  padding: 14px 28px; font-weight: 700; font-size: 0.92rem; text-transform: uppercase; letter-spacing: 0.04em;
  transition: transform 0.15s ease, box-shadow 0.15s ease, background 0.15s ease, border-color 0.15s ease;
  border: 1px solid transparent; cursor: pointer;
  clip-path: polygon(var(--cut) 0, 100% 0, 100% calc(100% - var(--cut)), calc(100% - var(--cut)) 100%, 0 100%, 0 var(--cut));
}
.btn-primary { background: var(--amber); color: #fff; }
.btn-primary:hover { background: var(--amber-dark); color: #fff; transform: translateY(-2px); box-shadow: 0 10px 22px var(--amber-glow); }
.btn-ghost { background: transparent; color: #fff; border-color: rgba(255,255,255,0.35); }
.btn-ghost:hover { border-color: var(--amber); color: var(--amber); }

.link-arrow { font-weight: 700; font-size: 0.85rem; text-transform: uppercase; letter-spacing: 0.03em; }

.eyebrow {
  display: flex; align-items: center; gap: 10px;
  text-transform: uppercase; letter-spacing: 0.14em; font-size: 0.76rem; font-weight: 700;
  color: var(--amber); margin-bottom: 16px;
}
.eyebrow-center { justify-content: center; }
.eyebrow-dash { width: 28px; height: 2px; background: var(--amber); display: inline-block; flex: none; }

/* Header */
.site-header {
  position: sticky; top: 0; z-index: 100; background: rgba(255,255,255,0.94);
  backdrop-filter: saturate(180%) blur(10px); border-bottom: 2px solid var(--graphite-900);
}
.header-inner { display: flex; align-items: center; justify-content: space-between; gap: 24px; height: 78px; }
.brand { display: flex; align-items: center; gap: 14px; color: var(--ink); }
.brand-logo { height: 34px; width: auto; flex: none; }
.footer-logo { height: 30px; margin-bottom: 12px; }
.brand-text { display: flex; flex-direction: column; line-height: 1.2; padding-left: 14px; border-left: 1px solid var(--border); white-space: nowrap; flex: none; }
.brand-text strong { font-family: var(--font-head); font-size: 0.95rem; color: var(--graphite-900); text-transform: uppercase; letter-spacing: 0.01em; }
.brand-text small { color: var(--ink-soft); font-size: 0.7rem; letter-spacing: 0.03em; text-transform: uppercase; }
.brand { flex: none; }

.main-nav ul {
  list-style: none; display: flex; align-items: center; gap: 18px; margin: 0; padding: 0;
}
.main-nav a { color: var(--ink-soft); font-weight: 600; font-size: 0.85rem; text-transform: uppercase; letter-spacing: 0.03em; position: relative; padding-bottom: 4px; }
.main-nav a:not(.btn-nav)::after {
  content: ""; position: absolute; left: 0; bottom: 0; width: 0; height: 2px; background: var(--amber);
  transition: width 0.15s ease;
}
.main-nav a:not(.btn-nav):hover::after { width: 100%; }
.main-nav a[aria-current="page"] { color: var(--graphite-900); }
.main-nav a[aria-current="page"]::after { width: 100%; }
.btn-nav {
  display: inline-flex; align-items: center; white-space: nowrap; flex: none;
  background: var(--graphite-900); color: #fff !important; padding: 11px 22px;
  font-weight: 700; font-size: 0.8rem; text-transform: uppercase; letter-spacing: 0.04em;
  clip-path: polygon(8px 0, 100% 0, 100% calc(100% - 8px), calc(100% - 8px) 100%, 0 100%, 0 8px);
}
.btn-nav:hover { background: var(--amber); }

/* Language switcher */
.lang-group { display: inline-flex; align-items: center; flex: none; border: 1px solid var(--border); }
.lang-switch {
  display: inline-flex; align-items: center; gap: 5px; white-space: nowrap; flex: none;
  padding: 7px 11px; color: var(--ink-soft) !important;
  font-size: 0.72rem; font-weight: 700; letter-spacing: 0.03em;
}
.lang-group .lang-switch + .lang-switch { border-left: 1px solid var(--border); }
.lang-switch:hover { color: var(--amber) !important; background: var(--bg-alt); }
.lang-group > .lang-switch:first-child::before { content: "🌐"; font-size: 0.8rem; }

.nav-toggle {
  display: none; flex-direction: column; justify-content: center; gap: 5px;
  width: 40px; height: 40px; background: none; border: 1px solid var(--border); cursor: pointer;
}
.nav-toggle span { display: block; width: 18px; height: 2px; background: var(--graphite-900); margin: 0 auto; }

/* Hero — dark blueprint */
.hero {
  position: relative; overflow: hidden;
  background: var(--graphite-950);
  padding: 90px 0 70px;
  isolation: isolate;
}
.hero-grid-bg {
  position: absolute; inset: 0; z-index: 0;
  background-image:
    linear-gradient(rgba(255,255,255,0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.05) 1px, transparent 1px);
  background-size: 44px 44px;
  mask-image: radial-gradient(ellipse 90% 80% at 30% 20%, #000 40%, transparent 90%);
}
.hero::after {
  content: ""; position: absolute; z-index: 0; top: -20%; right: -10%; width: 620px; height: 620px;
  background: radial-gradient(circle, var(--amber-glow), transparent 70%);
  pointer-events: none;
}
.hero-grid { display: grid; grid-template-columns: 1.35fr 1fr; gap: 48px; align-items: center; position: relative; z-index: 1; }
.hero h1 { font-size: clamp(2.1rem, 3.8vw, 3.1rem); margin-bottom: 18px; color: #fff; }
.hero-lede { font-size: 1.05rem; max-width: 56ch; color: #aebccb; }
.hero-actions { display: flex; gap: 14px; flex-wrap: wrap; margin: 24px 0 28px; }
.hero-trust {
  list-style: none; padding: 0; margin: 0; display: flex; gap: 20px; flex-wrap: wrap;
  font-size: 0.8rem; color: #cddaea; font-weight: 700; text-transform: uppercase; letter-spacing: 0.02em;
}
.hero-trust li { padding-left: 18px; position: relative; }
.hero-trust li::before {
  content: ""; position: absolute; left: 0; top: 50%; transform: translateY(-50%) rotate(45deg);
  width: 7px; height: 7px; background: var(--amber);
}

.hero-stats { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.stat-card {
  background: rgba(255,255,255,0.04); border: 1px solid var(--border-dark); border-left: 3px solid var(--amber);
  padding: 22px; text-align: left; backdrop-filter: blur(6px);
}
.stat-num { display: block; font-family: var(--font-head); font-size: 1.9rem; font-weight: 700; color: #fff; }
.stat-label { display: block; font-size: 0.78rem; color: #93a4b8; margin-top: 6px; text-transform: uppercase; letter-spacing: 0.02em; }

.hero-divider {
  position: absolute; left: 0; right: 0; bottom: -1px; height: 46px; background: var(--bg);
  clip-path: polygon(0 100%, 100% 100%, 100% 0, 0 100%);
}

/* Sections */
.section { padding: 76px 0; position: relative; }
.section-head { max-width: 640px; margin: 0 auto 44px; text-align: center; }
.section-head h2 { margin-bottom: 10px; }
.section-head.on-dark h2 { color: #fff; }
.section-head.on-dark p { color: #93a4b8; }

.intro-grid { display: grid; grid-template-columns: 1.2fr 0.8fr; gap: 48px; align-items: center; }
.intro h2 { font-size: 1.85rem; }
.intro-media { display: grid; gap: 16px; }
.frame { position: relative; padding: 10px; border: 1px solid var(--border); }
.frame::before, .frame::after {
  content: ""; position: absolute; width: 16px; height: 16px; border: 2px solid var(--amber);
}
.frame::before { top: -2px; left: -2px; border-right: none; border-bottom: none; }
.frame::after { bottom: -2px; right: -2px; border-left: none; border-top: none; }
.frame img { border: 1px solid var(--border); }

/* Materials — dark section */
.materials { background: var(--graphite-900); overflow: hidden; }
.materials-grid-bg {
  position: absolute; inset: 0; z-index: 0;
  background-image:
    linear-gradient(rgba(255,255,255,0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.04) 1px, transparent 1px);
  background-size: 40px 40px;
}

/* Card grid */
.card-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
.card {
  position: relative;
  background: rgba(255,255,255,0.035); border: 1px solid var(--border-dark); border-top: 3px solid var(--amber);
  padding: 26px 22px 22px; transition: transform 0.15s ease, background 0.15s ease, box-shadow 0.15s ease;
}
.card:hover { transform: translateY(-4px); background: rgba(255,255,255,0.06); box-shadow: var(--shadow); }
.card-num {
  position: absolute; top: 14px; right: 18px; font-family: var(--font-head); font-weight: 700;
  font-size: 0.85rem; color: rgba(255,255,255,0.25); letter-spacing: 0.05em;
}
.card img { margin-bottom: 16px; border: 1px solid var(--border-dark); filter: saturate(0.9) contrast(1.05); }
.card h3 { font-size: 1.05rem; color: #fff; }
.card p { font-size: 0.9rem; color: #9fadbd; }
.card .link-arrow { color: var(--amber); }

/* Why */
.why { background: var(--graphite-950); color: #fff; overflow: hidden; }
.why h2 { color: #fff; }
.why-grid { display: grid; grid-template-columns: 1.2fr 0.8fr; gap: 48px; align-items: start; }
.why-list { list-style: none; margin: 0 0 26px; padding: 0; display: grid; gap: 16px; }
.why-list li { color: #b7c4d3; font-size: 0.96rem; padding-left: 24px; position: relative; }
.why-list li::before {
  content: ""; position: absolute; left: 0; top: 6px; width: 9px; height: 9px; background: var(--amber);
  transform: rotate(45deg);
}
.why-list strong { color: #fff; }
.pull-quote {
  font-family: var(--font-head); font-size: 1.35rem; line-height: 1.5; color: #fff;
  border-left: 3px solid var(--amber); padding-left: 24px; margin: 0; align-self: center;
}

/* Contact */
.contact { background: var(--bg-alt); }
.contact-grid { display: grid; grid-template-columns: 1.3fr 0.9fr; gap: 48px; align-items: start; }
.quote-form { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; margin-top: 22px; }
.form-row { display: flex; flex-direction: column; gap: 6px; }
.form-row-full { grid-column: 1 / -1; }
label { font-size: 0.78rem; font-weight: 700; color: var(--graphite-900); text-transform: uppercase; letter-spacing: 0.03em; }
input, select, textarea {
  font-family: var(--font-body); font-size: 0.95rem; padding: 12px 14px;
  border: 1px solid var(--border); background: #fff; color: var(--ink);
}
input:focus, select:focus, textarea:focus { outline: 2px solid var(--steel-500); outline-offset: 1px; }
.form-note { grid-column: 1 / -1; font-size: 0.8rem; color: var(--ink-soft); margin-top: 4px; }
.quote-form .btn-primary { color: #fff; }

.contact-card {
  background: var(--graphite-900); border-top: 3px solid var(--amber);
  padding: 30px; color: #fff;
}
.contact-card h3 { font-size: 1.05rem; color: #fff; text-transform: uppercase; letter-spacing: 0.03em; }
.contact-card address { font-style: normal; color: #9fadbd; margin-bottom: 16px; }
.contact-card p { font-size: 0.95rem; margin-bottom: 8px; color: #cddaea; }
.contact-card a { color: #fff; font-weight: 600; }
.contact-card a:hover { color: var(--amber); }
.contact-hours { color: var(--amber); font-weight: 700; font-size: 0.8rem; text-transform: uppercase; letter-spacing: 0.02em; }

/* Footer */
.site-footer { background: var(--graphite-950); color: #8394a6; padding: 50px 0 28px; border-top: 3px solid var(--amber); }
.footer-grid { display: grid; grid-template-columns: 1.2fr 1.4fr; gap: 24px; align-items: start; }
.footer-grid p { color: #8394a6; font-size: 0.88rem; }
.site-footer nav { display: flex; flex-wrap: wrap; gap: 16px 22px; }
.site-footer nav a { color: #cfdaea; font-size: 0.85rem; text-transform: uppercase; letter-spacing: 0.02em; font-weight: 600; }
.site-footer nav a:hover { color: var(--amber); }
.copyright { grid-column: 1 / -1; border-top: 1px solid rgba(255,255,255,0.08); padding-top: 20px; font-size: 0.78rem; color: #5f6f82; }

/* Back to top */
.to-top {
  position: fixed; right: 20px; bottom: 20px; width: 46px; height: 46px;
  background: var(--graphite-900); color: var(--amber); border: 1px solid var(--amber); font-size: 1.1rem; cursor: pointer;
  clip-path: polygon(8px 0, 100% 0, 100% calc(100% - 8px), calc(100% - 8px) 100%, 0 100%, 0 8px);
  box-shadow: var(--shadow); opacity: 0; visibility: hidden; transition: opacity 0.2s ease;
}
.to-top.visible { opacity: 1; visibility: visible; }

/* ============================================================
   Shared inner-page components (about / products / capability /
   quality / technical)
   ============================================================ */

/* Breadcrumb */
.breadcrumb {
  display: flex; align-items: center; gap: 8px; font-size: 0.8rem; font-weight: 600;
  text-transform: uppercase; letter-spacing: 0.03em; color: #93a4b8; margin-bottom: 22px; position: relative; z-index: 1;
}
.breadcrumb a { color: #93a4b8; }
.breadcrumb a:hover { color: var(--amber); }
.breadcrumb span[aria-hidden] { color: #4a5661; }
.breadcrumb .current { color: var(--amber); }

/* Page hero — shorter than the homepage hero, same blueprint bg */
.page-hero {
  position: relative; overflow: hidden; background: var(--graphite-950);
  padding: 56px 0 64px; isolation: isolate;
}
.page-hero .hero-grid-bg { background-size: 40px 40px; }
.page-hero::after {
  content: ""; position: absolute; z-index: 0; top: -30%; right: -6%; width: 480px; height: 480px;
  background: radial-gradient(circle, var(--amber-glow), transparent 70%); pointer-events: none;
}
.page-hero h1 { color: #fff; font-size: clamp(1.9rem, 3.4vw, 2.6rem); margin-bottom: 16px; max-width: 22ch; position: relative; z-index: 1; }
.page-hero .hero-lede { position: relative; z-index: 1; max-width: 62ch; }
.page-hero .eyebrow { position: relative; z-index: 1; }
.page-hero-divider {
  position: absolute; left: 0; right: 0; bottom: -1px; height: 40px; background: var(--bg);
  clip-path: polygon(0 100%, 100% 100%, 100% 0, 0 100%);
}

/* Prose two-column layout (text + framed image) */
.prose-grid { display: grid; grid-template-columns: 1.2fr 0.8fr; gap: 48px; align-items: start; }
.prose-grid .frame + .frame { margin-top: 16px; }
.prose h2 { font-size: 1.6rem; }
.prose p { max-width: 62ch; }

/* Tag / pill grid (materials, industries, equipment) */
.tag-grid { display: flex; flex-wrap: wrap; gap: 10px; }
.tag {
  display: inline-flex; align-items: center; gap: 8px; padding: 10px 16px;
  background: rgba(255,255,255,0.04); border: 1px solid var(--border-dark); color: #cddaea;
  font-size: 0.85rem; font-weight: 600;
}
.tag::before { content: ""; width: 6px; height: 6px; background: var(--amber); transform: rotate(45deg); flex: none; }
.tag-grid.on-light .tag { background: #fff; border-color: var(--border); color: var(--ink); box-shadow: var(--shadow-sm); }
.tag-grid.on-light .tag::before { background: var(--steel-500); }

/* Value / partner cards (used on About) */
.value-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
.value-card {
  background: #fff; border: 1px solid var(--border); border-top: 3px solid var(--amber);
  padding: 26px 22px; box-shadow: var(--shadow-sm);
}
.value-card h3 { font-size: 1.02rem; }
.value-card p { font-size: 0.9rem; margin-bottom: 0; }

/* Numbered process steps (Technical page) */
.step-list { list-style: none; margin: 0; padding: 0; display: grid; gap: 18px; }
.step-list li {
  display: grid; grid-template-columns: 48px 1fr; gap: 18px; align-items: start;
  padding-bottom: 18px; border-bottom: 1px solid var(--border-dark);
}
.step-list li:last-child { border-bottom: none; padding-bottom: 0; }
.step-num {
  font-family: var(--font-head); font-weight: 700; font-size: 1.1rem; color: var(--amber);
  border: 1px solid var(--amber); width: 44px; height: 44px; display: flex; align-items: center; justify-content: center;
  flex: none;
}
.step-list h3 { font-size: 1rem; color: #fff; margin-bottom: 4px; }
.step-list p { font-size: 0.9rem; color: #9fadbd; margin-bottom: 0; }

/* Product gallery (Products page) */
.product-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; }
.product-card {
  background: #fff; border: 1px solid var(--border); overflow: hidden; box-shadow: var(--shadow-sm);
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}
.product-card:hover { transform: translateY(-3px); box-shadow: var(--shadow); }
.product-card img { aspect-ratio: 4/3; object-fit: cover; width: 100%; }
.product-card-body { padding: 16px 16px 18px; }
.product-card h3 { font-size: 0.92rem; margin-bottom: 8px; }
.spec-list { list-style: none; margin: 0; padding: 0; display: grid; gap: 4px; }
.spec-list li { font-size: 0.78rem; color: var(--ink-soft); display: flex; justify-content: space-between; gap: 8px; }
.spec-list b { color: var(--graphite-900); font-weight: 600; }

/* Equipment / method list (Quality page) */
.split-list { display: grid; grid-template-columns: 1fr 1fr; gap: 32px; }
.split-list h3 { color: #fff; font-size: 1rem; margin-bottom: 14px; }
.plain-list { list-style: none; margin: 0; padding: 0; display: grid; gap: 10px; }
.plain-list li { color: #b7c4d3; font-size: 0.92rem; padding-left: 20px; position: relative; }
.plain-list li::before { content: ""; position: absolute; left: 0; top: 7px; width: 8px; height: 8px; background: var(--amber); transform: rotate(45deg); }

/* CTA band before footer */
.cta-band { background: var(--graphite-950); color: #fff; padding: 56px 0; text-align: center; border-top: 3px solid var(--amber); }
.cta-band h2 { color: #fff; margin-bottom: 10px; }
.cta-band p { color: #93a4b8; max-width: 52ch; margin: 0 auto 26px; }

figure.frame { margin: 0; }
figcaption { font-size: 0.78rem; color: var(--ink-soft); margin-top: 8px; }
.why .figcaption, .step-list figcaption { color: #93a4b8; }

/* Responsive */
@media (max-width: 900px) {
  .hero-grid, .intro-grid, .why-grid, .contact-grid, .footer-grid { grid-template-columns: 1fr; }
  .card-grid { grid-template-columns: repeat(2, 1fr); }
  .pull-quote { border-left: none; border-top: 3px solid var(--amber); padding-left: 0; padding-top: 16px; }
}
/* Full horizontal nav (7 links + CTA) needs real room — collapse to the hamburger
   well before it starts crowding the logo, not just on phones. German and Japanese
   nav labels run longer than English, so the breakpoint is set generously. */
@media (max-width: 1440px) {
  .main-nav ul {
    position: fixed; inset: 78px 0 auto 0; background: #fff; flex-direction: column; align-items: stretch;
    padding: 16px 24px 24px; border-bottom: 1px solid var(--border); gap: 4px;
    transform: translateY(-8px); opacity: 0; visibility: hidden; transition: all 0.2s ease;
  }
  .main-nav ul.open { transform: translateY(0); opacity: 1; visibility: visible; }
  .main-nav li { padding: 10px 0; border-bottom: 1px solid var(--border); }
  .btn-nav { display: inline-flex; margin-top: 8px; }
  .nav-toggle { display: flex; }
}
@media (max-width: 720px) {
  .card-grid { grid-template-columns: 1fr; }
  .quote-form { grid-template-columns: 1fr; }
  .hero { padding: 56px 0 46px; }
  .section { padding: 54px 0; }
}
@media (max-width: 900px) {
  .prose-grid, .split-list { grid-template-columns: 1fr; }
  .value-grid { grid-template-columns: 1fr 1fr; }
  .product-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 560px) {
  .value-grid, .product-grid { grid-template-columns: 1fr; }
  .step-list li { grid-template-columns: 40px 1fr; }
}