/*
Theme Name: Zhongtian Magnesium
Theme URI: https://zhongtianmagnesium.com/
Author: Zhongtian Magnesium
Description: Premium English B2B theme for magnesium materials and lightweight manufacturing.
Version: 1.0.2
Text Domain: zhongtian-magnesium
*/

:root {
  --ink: #061018;
  --ink-2: #0b1822;
  --panel: #10232f;
  --paper: #f2f4f3;
  --white: #ffffff;
  --muted: #aab6bd;
  --line: rgba(255,255,255,.16);
  --blue: #13a9d6;
  --blue-bright: #5fd6f3;
  --orange: #ff7a2f;
  --max: 1280px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; overflow-x: hidden; }
body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: Arial, Helvetica, sans-serif;
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
body.nav-open { overflow: hidden; }
a { color: inherit; text-decoration: none; }
img { display: block; max-width: 100%; }
button, input, textarea { font: inherit; }

.container { width: min(calc(100% - 48px), var(--max)); margin-inline: auto; }
.eyebrow {
  margin: 0 0 18px;
  color: var(--blue-bright);
  font-size: .78rem;
  font-weight: 800;
  letter-spacing: .18em;
  text-transform: uppercase;
}
.section-title {
  max-width: 850px;
  margin: 0;
  font-size: clamp(2.35rem, 5vw, 5.8rem);
  line-height: .98;
  letter-spacing: -.055em;
  font-weight: 800;
}
.section-intro { max-width: 660px; margin: 30px 0 0; color: #596770; font-size: 1.08rem; }
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 52px;
  padding: 0 24px;
  border: 1px solid transparent;
  border-radius: 0;
  background: var(--blue);
  color: var(--white);
  font-size: .83rem;
  font-weight: 800;
  letter-spacing: .08em;
  text-transform: uppercase;
  transition: background .25s ease, color .25s ease, border-color .25s ease, transform .25s ease;
  cursor: pointer;
}
.btn:hover, .btn:focus-visible { background: var(--blue-bright); color: var(--ink); transform: translateY(-2px); }
.btn-outline { background: transparent; border-color: rgba(255,255,255,.48); }
.btn-outline:hover, .btn-outline:focus-visible { border-color: var(--white); background: var(--white); }

.site-header {
  position: fixed;
  inset: 0 0 auto;
  z-index: 100;
  color: var(--white);
  border-bottom: 1px solid rgba(255,255,255,.12);
  transition: background .3s ease, box-shadow .3s ease;
}
.site-header.scrolled { background: rgba(6,16,24,.96); box-shadow: 0 12px 30px rgba(0,0,0,.16); }
.header-inner { min-height: 88px; display: flex; align-items: center; justify-content: space-between; gap: 28px; }
.brand { display: inline-flex; align-items: center; gap: 12px; font-size: .95rem; font-weight: 800; letter-spacing: .08em; text-transform: uppercase; }
.brand-mark { width: 38px; height: 38px; flex: 0 0 38px; }
.main-nav { display: flex; align-items: center; gap: clamp(18px, 2vw, 34px); }
.main-nav a { position: relative; font-size: .76rem; font-weight: 700; letter-spacing: .08em; text-transform: uppercase; }
.main-nav a:not(.btn)::after { content: ""; position: absolute; left: 0; right: 100%; bottom: -8px; height: 2px; background: var(--blue-bright); transition: right .25s ease; }
.main-nav a:hover::after, .main-nav a:focus-visible::after { right: 0; }
.main-nav .btn { min-height: 44px; padding-inline: 18px; }
.nav-toggle { display: none; width: 46px; height: 46px; border: 1px solid var(--line); background: transparent; color: var(--white); cursor: pointer; }
.nav-toggle span, .nav-toggle::before, .nav-toggle::after { content: ""; display: block; width: 21px; height: 2px; margin: 5px auto; background: currentColor; transition: transform .25s ease, opacity .25s ease; }

.hero {
  position: relative;
  min-height: 100svh;
  display: grid;
  align-items: end;
  color: var(--white);
  background: var(--ink) center/cover no-repeat;
  overflow: hidden;
}
.hero::before { content: ""; position: absolute; inset: 0; background: linear-gradient(90deg, rgba(4,11,16,.93) 0%, rgba(4,11,16,.74) 40%, rgba(4,11,16,.22) 76%, rgba(4,11,16,.45) 100%), linear-gradient(0deg, rgba(4,11,16,.72), transparent 48%); }
.hero::after { content: ""; position: absolute; inset: auto 0 0; height: 5px; background: linear-gradient(90deg, var(--blue) 0 33%, transparent 33%); }
.hero-inner { position: relative; z-index: 1; padding: 170px 0 85px; }
.hero h1 { max-width: 980px; margin: 0; font-size: clamp(3.4rem, 7.5vw, 8.5rem); line-height: .88; letter-spacing: -.065em; font-weight: 800; text-transform: uppercase; }
.hero h1 span { color: var(--blue-bright); }
.hero-copy { display: grid; grid-template-columns: minmax(280px, 620px) auto; align-items: end; gap: 50px; margin-top: 42px; }
.hero-copy p { margin: 0; color: #d2dbe0; font-size: clamp(1rem, 1.45vw, 1.22rem); }
.hero-actions { display: flex; gap: 12px; flex-wrap: wrap; }

.ticker { background: var(--blue); color: var(--ink); overflow: hidden; }
.ticker-track { min-height: 58px; display: flex; align-items: center; gap: 44px; width: max-content; animation: ticker 28s linear infinite; }
.ticker span { font-size: .77rem; font-weight: 800; letter-spacing: .13em; text-transform: uppercase; white-space: nowrap; }
.ticker i { width: 5px; height: 5px; background: var(--ink); border-radius: 50%; }
@keyframes ticker { to { transform: translateX(-50%); } }

.intro { padding: 130px 0; background: var(--paper); }
.intro-grid { display: grid; grid-template-columns: 1.25fr .75fr; gap: 90px; align-items: end; }
.intro-aside { border-left: 1px solid #bdc7cc; padding-left: 34px; }
.intro-aside p { margin: 0; font-size: 1.15rem; color: #4f5e67; }
.intro-aside strong { display: block; margin-top: 28px; font-size: .78rem; letter-spacing: .11em; text-transform: uppercase; }

.metrics { background: var(--ink); color: var(--white); }
.metrics-grid { display: grid; grid-template-columns: repeat(3, 1fr); }
.metric { min-height: 320px; padding: 52px 44px; border-right: 1px solid var(--line); display: flex; flex-direction: column; justify-content: space-between; }
.metric:last-child { border-right: 0; }
.metric-number { font-size: clamp(4.5rem, 8vw, 8.5rem); line-height: .85; font-weight: 800; letter-spacing: -.065em; color: var(--blue-bright); }
.metric-label { max-width: 280px; color: #d0d8dc; font-size: .95rem; }
.metric-label strong { display: block; color: var(--white); font-size: 1.14rem; margin-bottom: 8px; }

.supply { padding: 135px 0; background: #0a1922; color: var(--white); }
.supply .section-intro { color: #a8b7bf; }
.supply-grid { display: grid; grid-template-columns: repeat(3, 1fr); margin-top: 70px; border-top: 1px solid var(--line); border-left: 1px solid var(--line); }
.supply-card { min-height: 400px; padding: 44px; border-right: 1px solid var(--line); border-bottom: 1px solid var(--line); transition: background .3s ease; }
.supply-card:hover { background: rgba(19,169,214,.09); }
.supply-index { color: var(--blue-bright); font-size: .78rem; font-weight: 800; letter-spacing: .1em; }
.supply-card h3 { margin: 130px 0 18px; font-size: 2rem; letter-spacing: -.035em; line-height: 1.05; }
.supply-card p { margin: 0; color: #9fb0b9; }
.arrow-link { display: inline-flex; align-items: center; gap: 11px; margin-top: 28px; color: var(--blue-bright); font-size: .76rem; font-weight: 800; letter-spacing: .1em; text-transform: uppercase; }
.arrow-link::after { content: "\2192"; font-size: 1.15rem; transition: transform .2s ease; }
.arrow-link:hover::after { transform: translateX(5px); }

.product-story { background: var(--white); }
.product-media { position: relative; min-height: 680px; background: var(--ink) center/cover no-repeat; }
.product-media::after { content: ""; position: absolute; inset: 0; background: linear-gradient(90deg, rgba(5,15,22,.14), rgba(5,15,22,.56)); }
.product-panel { margin-top: -130px; position: relative; z-index: 2; background: var(--white); padding: 80px 0 120px; }
.product-layout { display: grid; grid-template-columns: .9fr 1.1fr; gap: 90px; }
.product-list { border-top: 1px solid #cbd2d6; }
.product-row { display: grid; grid-template-columns: 54px 1fr auto; align-items: center; gap: 18px; min-height: 112px; border-bottom: 1px solid #cbd2d6; }
.product-row span { color: #71808a; font-size: .77rem; font-weight: 800; }
.product-row h3 { margin: 0; font-size: 1.28rem; letter-spacing: -.02em; }
.product-row b { font-size: 1.35rem; color: var(--blue); }

.applications { padding: 130px 0; background: #dce3e6; }
.app-grid { display: grid; grid-template-columns: repeat(2, 1fr); margin-top: 65px; }
.app-card { min-height: 300px; padding: 46px; border-top: 1px solid #9faeb6; border-right: 1px solid #9faeb6; position: relative; overflow: hidden; }
.app-card:nth-child(even) { border-right: 0; }
.app-card:nth-child(n+3) { border-bottom: 1px solid #9faeb6; }
.app-card h3 { margin: 0 0 13px; font-size: clamp(1.8rem, 3vw, 3.1rem); letter-spacing: -.045em; }
.app-card p { max-width: 470px; color: #4c5c65; }
.app-icon { position: absolute; right: 35px; bottom: 24px; color: rgba(6,16,24,.10); font-size: 7rem; font-weight: 800; line-height: 1; }

.quality { position: relative; padding: 140px 0; color: var(--white); background: var(--ink) center/cover no-repeat; }
.quality::before { content: ""; position: absolute; inset: 0; background: linear-gradient(90deg, rgba(5,13,19,.96), rgba(5,13,19,.62)); }
.quality-inner { position: relative; display: grid; grid-template-columns: 1.1fr .9fr; gap: 90px; }
.quality-list { display: grid; gap: 0; border-top: 1px solid var(--line); }
.quality-item { padding: 28px 0; border-bottom: 1px solid var(--line); display: grid; grid-template-columns: 36px 1fr; gap: 18px; }
.quality-item span { color: var(--blue-bright); font-weight: 800; }
.quality-item h3 { margin: 0 0 8px; font-size: 1.15rem; }
.quality-item p { margin: 0; color: #a6b4bb; }

.contact { padding: 125px 0; background: var(--blue); color: var(--ink); }
.contact-grid { display: grid; grid-template-columns: .9fr 1.1fr; gap: 90px; }
.contact .eyebrow { color: var(--ink); }
.contact .section-title { font-size: clamp(2.7rem, 5.5vw, 6.2rem); }
.contact-note { max-width: 500px; margin-top: 28px; }
.quote-form { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
.field { display: grid; gap: 8px; }
.field-full { grid-column: 1 / -1; }
.field label { font-size: .72rem; font-weight: 800; letter-spacing: .1em; text-transform: uppercase; }
.field input, .field textarea { width: 100%; border: 0; border-bottom: 1px solid rgba(6,16,24,.55); border-radius: 0; padding: 13px 0; background: transparent; color: var(--ink); outline: 0; }
.field textarea { min-height: 105px; resize: vertical; }
.field input:focus, .field textarea:focus { border-color: var(--ink); box-shadow: 0 2px 0 var(--ink); }
.quote-form .btn { justify-self: start; background: var(--ink); color: var(--white); }
.form-status { grid-column: 1 / -1; margin: 0; padding: 12px 15px; border: 1px solid rgba(6,16,24,.45); font-weight: 700; }
.website-field { position: absolute !important; left: -9999px !important; }

.site-footer { padding: 70px 0 26px; background: #040c12; color: var(--white); }
.footer-grid { display: grid; grid-template-columns: 1.2fr .8fr .8fr; gap: 70px; padding-bottom: 65px; }
.footer-brand p { max-width: 450px; color: #8fa0aa; }
.footer-col h3 { margin: 0 0 18px; color: #72848f; font-size: .72rem; letter-spacing: .12em; text-transform: uppercase; }
.footer-col a { display: block; margin: 8px 0; color: #cbd4d9; }
.footer-bottom { display: flex; justify-content: space-between; gap: 22px; padding-top: 25px; border-top: 1px solid var(--line); color: #687b86; font-size: .76rem; }

.reveal { opacity: 0; transform: translateY(28px); transition: opacity .7s ease, transform .7s ease; }
.reveal.visible { opacity: 1; transform: none; }

@media (max-width: 980px) {
  .container { width: min(calc(100% - 34px), var(--max)); }
  .nav-toggle { display: block; }
  .main-nav { position: fixed; inset: 88px 0 0; display: flex; flex-direction: column; align-items: flex-start; padding: 40px 28px; background: rgba(6,16,24,.99); transform: translateX(100%); visibility: hidden; transition: transform .3s ease, visibility .3s ease; }
  .nav-open .main-nav { transform: none; visibility: visible; }
  .main-nav a { font-size: 1.15rem; }
  .main-nav .btn { margin-top: 16px; }
  .nav-open .nav-toggle span { opacity: 0; }
  .nav-open .nav-toggle::before { transform: translateY(7px) rotate(45deg); }
  .nav-open .nav-toggle::after { transform: translateY(-7px) rotate(-45deg); }
  .hero-copy, .intro-grid, .product-layout, .quality-inner, .contact-grid { grid-template-columns: 1fr; gap: 44px; }
  .metrics-grid, .supply-grid { grid-template-columns: 1fr; }
  .metric { min-height: 230px; border-right: 0; border-bottom: 1px solid var(--line); }
  .supply-card { min-height: 320px; }
  .supply-card h3 { margin-top: 70px; }
  .product-media { min-height: 520px; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .footer-brand { grid-column: 1 / -1; }
}

@media (max-width: 640px) {
  .header-inner { min-height: 74px; }
  .main-nav { top: 74px; }
  .brand { font-size: .76rem; }
  .brand-mark { width: 34px; height: 34px; }
  .hero-inner { padding: 130px 0 60px; }
  .hero h1 { font-size: clamp(2.5rem, 14vw, 4.4rem); }
  .hero-copy { margin-top: 30px; }
  .hero-actions { display: grid; }
  .intro, .supply, .applications, .quality, .contact { padding: 88px 0; }
  .metric { padding: 38px 24px; }
  .supply-card { padding: 32px 25px; }
  .product-media { min-height: 380px; }
  .product-panel { margin-top: -52px; padding: 55px 0 88px; }
  .product-row { grid-template-columns: 34px 1fr auto; min-height: 96px; }
  .app-grid { grid-template-columns: 1fr; }
  .app-card { min-height: 245px; border-right: 0; border-bottom: 1px solid #9faeb6; padding: 34px 24px; }
  .quote-form { grid-template-columns: 1fr; }
  .field-full { grid-column: auto; }
  .footer-grid { grid-template-columns: 1fr; gap: 36px; }
  .footer-brand { grid-column: auto; }
  .footer-bottom { flex-direction: column; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: .01ms !important; animation-iteration-count: 1 !important; transition-duration: .01ms !important; }
  .reveal { opacity: 1; transform: none; }
}