:root {
  --navy: #071b33;
  --navy-2: #102b4d;
  --blue: #1f62b7;
  --gold: #ad7626;
  --green: #167a5a;
  --ink: #142033;
  --muted: #647287;
  --line: #dbe3ec;
  --paper: #f5f8fb;
  --white: #ffffff;
  --shadow: 0 18px 45px rgba(7, 27, 51, .10);
  font-family: "Noto Sans KR", "Apple SD Gothic Neo", "Malgun Gothic", Arial, sans-serif;
  color: var(--ink);
  background: var(--paper);
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; min-width: 320px; background: var(--paper); line-height: 1.65; }
a { color: inherit; text-decoration: none; }
button, a { -webkit-tap-highlight-color: transparent; }
img { display: block; max-width: 100%; }
.skip { position: fixed; left: 12px; top: -80px; z-index: 100; padding: 10px 14px; color: #fff; background: var(--navy); }
.skip:focus { top: 12px; }
.shell { width: min(1180px, calc(100% - 40px)); margin: 0 auto; }
.site-header { position: sticky; top: 0; z-index: 50; border-bottom: 1px solid rgba(219, 227, 236, .82); background: rgba(255, 255, 255, .93); backdrop-filter: blur(18px); }
.header-inner { min-height: 76px; display: flex; align-items: center; justify-content: space-between; gap: 22px; }
.brand img { width: 278px; height: 58px; object-fit: contain; object-position: left center; }
.nav { display: flex; align-items: center; gap: 6px; }
.nav a { min-height: 44px; padding: 10px 13px; border-radius: 6px; color: #40516a; font-size: 14px; font-weight: 650; }
.nav a:hover, .nav a:focus-visible, .nav a.active { color: var(--navy); background: #eaf1f8; outline: none; }
.menu-toggle { display: none; width: 44px; height: 44px; border: 1px solid var(--line); border-radius: 6px; background: #fff; color: var(--navy); }
.menu-toggle svg { width: 22px; height: 22px; }
.hero { position: relative; min-height: 670px; display: grid; align-items: end; overflow: hidden; color: #fff; background: var(--navy); }
.hero-media { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; opacity: .50; }
.hero::after { content: ""; position: absolute; inset: 0; background: linear-gradient(90deg, rgba(5, 21, 41, .96) 0%, rgba(5, 21, 41, .80) 44%, rgba(5, 21, 41, .2) 100%), linear-gradient(0deg, rgba(5, 21, 41, .9), transparent 58%); }
.hero-content { position: relative; z-index: 2; max-width: 760px; padding: 125px 0 96px; }
.eyebrow { margin: 0 0 16px; color: #c99542; font-size: 13px; font-weight: 800; letter-spacing: 0; text-transform: uppercase; }
.hero h1 { max-width: 720px; margin: 0; font-size: clamp(42px, 6vw, 76px); line-height: 1.08; letter-spacing: 0; }
.hero .lead { max-width: 650px; margin: 24px 0 0; color: #dce6f1; font-size: 18px; }
.hero-actions { margin-top: 34px; display: flex; flex-wrap: wrap; gap: 10px; }
.button { min-height: 48px; display: inline-flex; align-items: center; justify-content: center; gap: 8px; padding: 11px 18px; border: 1px solid transparent; border-radius: 6px; font-size: 14px; font-weight: 750; cursor: pointer; }
.button.primary { color: #fff; background: var(--blue); }
.button.secondary { color: #fff; border-color: rgba(255,255,255,.5); background: rgba(255,255,255,.08); }
.button.light { color: var(--navy); border-color: var(--line); background: #fff; }
.button svg { width: 18px; height: 18px; }
.trust-bar { position: relative; z-index: 3; border-top: 1px solid rgba(255,255,255,.16); background: rgba(4,17,34,.72); }
.trust-grid { display: grid; grid-template-columns: repeat(4, 1fr); }
.trust-item { min-height: 98px; padding: 20px 24px; border-left: 1px solid rgba(255,255,255,.13); }
.trust-item:last-child { border-right: 1px solid rgba(255,255,255,.13); }
.trust-item b { display: block; font-size: 20px; }
.trust-item span { color: #aebed0; font-size: 12px; }
.band { padding: 88px 0; }
.band.white { background: #fff; }
.band.navy { color: #fff; background: var(--navy); }
.section-head { max-width: 720px; margin-bottom: 38px; }
.section-head h2 { margin: 0; color: var(--navy); font-size: clamp(30px, 4vw, 46px); line-height: 1.18; }
.section-head p { margin: 16px 0 0; color: var(--muted); }
.navy .section-head h2 { color: #fff; }
.navy .section-head p { color: #b9c7d6; }
.feature-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.feature { min-height: 245px; padding: 28px; border: 1px solid var(--line); border-radius: 8px; background: #fff; box-shadow: 0 10px 28px rgba(7, 27, 51, .05); }
.feature-icon { width: 46px; height: 46px; display: grid; place-items: center; margin-bottom: 24px; border-radius: 6px; color: var(--blue); background: #eaf2fc; }
.feature-icon svg { width: 23px; height: 23px; }
.feature h3 { margin: 0 0 10px; font-size: 19px; }
.feature p { margin: 0; color: var(--muted); font-size: 14px; }
.process { display: grid; grid-template-columns: repeat(4, 1fr); border-top: 1px solid rgba(255,255,255,.24); }
.step { position: relative; padding: 30px 24px 0 0; }
.step::before { content: ""; position: absolute; top: -5px; left: 0; width: 9px; height: 9px; border-radius: 50%; background: #d69a3c; }
.step small { color: #d69a3c; font-weight: 800; }
.step h3 { margin: 9px 0 7px; font-size: 18px; }
.step p { margin: 0; color: #aebed0; font-size: 13px; }
.split { display: grid; grid-template-columns: 1fr 1fr; gap: 64px; align-items: center; }
.mineral-panel { min-height: 430px; padding: 28px; display: grid; align-content: end; border-radius: 8px; color: #fff; background: linear-gradient(155deg, #16446f, #071b33); box-shadow: var(--shadow); }
.mineral-panel b { font-size: 54px; line-height: 1; }
.mineral-panel span { margin-top: 12px; color: #d9e4ee; }
.check-list { margin: 24px 0 0; padding: 0; list-style: none; }
.check-list li { position: relative; margin: 13px 0; padding-left: 28px; }
.check-list li::before { content: "✓"; position: absolute; left: 0; color: var(--green); font-weight: 900; }
.notice { padding: 22px 24px; border-left: 4px solid var(--gold); background: #fff8eb; color: #55411d; font-size: 14px; }
.site-footer { padding: 54px 0 28px; color: #afbdcc; background: #041326; }
.footer-grid { display: grid; grid-template-columns: 1.5fr .8fr .8fr; gap: 46px; }
.footer-brand img { width: 245px; filter: brightness(0) invert(1); opacity: .95; }
.footer-brand p { max-width: 430px; margin: 18px 0 0; font-size: 13px; }
.footer-col h3 { margin: 0 0 14px; color: #fff; font-size: 14px; }
.footer-col a, .footer-col span { display: block; margin: 9px 0; font-size: 13px; }
.footer-col a:hover { color: #fff; }
.copyright { margin-top: 40px; padding-top: 20px; border-top: 1px solid rgba(255,255,255,.12); font-size: 12px; }
.page-hero { padding: 90px 0 64px; color: #fff; background: linear-gradient(120deg, rgba(7,27,51,.94), rgba(18,56,96,.82)), url("./industrial-materials.jpg") center/cover; }
.page-hero .crumb { color: #9fb2c8; font-size: 13px; }
.page-hero h1 { margin: 25px 0 16px; max-width: 820px; font-size: clamp(38px, 5vw, 64px); line-height: 1.12; }
.page-hero p { max-width: 720px; margin: 0; color: #c3d0dd; font-size: 17px; }
.doc-layout { display: grid; grid-template-columns: 245px minmax(0, 1fr); gap: 50px; align-items: start; }
.toc { position: sticky; top: 100px; padding: 22px; border: 1px solid var(--line); border-radius: 8px; background: #fff; }
.toc b { display: block; margin-bottom: 12px; font-size: 13px; }
.toc a { display: block; padding: 8px 0; color: var(--muted); border-bottom: 1px solid #edf1f5; font-size: 13px; }
.toc a:hover { color: var(--blue); }
.document { min-width: 0; }
.document section { scroll-margin-top: 105px; margin-bottom: 60px; }
.document h2 { margin: 0 0 18px; color: var(--navy); font-size: 30px; line-height: 1.28; }
.document h3 { margin: 28px 0 10px; font-size: 19px; }
.document p { color: #45546a; }
.document table { width: 100%; border-collapse: collapse; border: 1px solid var(--line); background: #fff; font-size: 14px; }
.document th, .document td { padding: 14px 16px; border-bottom: 1px solid var(--line); text-align: left; vertical-align: top; }
.document th { color: #fff; background: var(--navy-2); }
.metric-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; }
.metric { padding: 22px; border: 1px solid var(--line); border-radius: 8px; background: #fff; }
.metric b { display: block; color: var(--blue); font-size: 28px; }
.metric span { color: var(--muted); font-size: 13px; }
.timeline { position: relative; margin-left: 9px; padding-left: 34px; border-left: 1px solid #b8c7d7; }
.timeline article { position: relative; margin-bottom: 40px; }
.timeline article::before { content: ""; position: absolute; left: -40px; top: 5px; width: 11px; height: 11px; border: 3px solid #e5eef8; border-radius: 50%; background: var(--blue); }
.timeline time { color: var(--gold); font-size: 12px; font-weight: 850; }
.timeline h3 { margin: 7px 0; font-size: 21px; }
.timeline p { margin: 0; color: var(--muted); }
.reveal { opacity: 1; transform: none; animation: reveal-in .45s ease both; }
@keyframes reveal-in { from { opacity: 0; transform: translateY(16px); } }
@media (max-width: 860px) {
  .shell { width: min(100% - 28px, 720px); }
  .header-inner { min-height: 66px; }
  .brand img { width: 210px; height: 50px; }
  .menu-toggle { display: grid; place-items: center; }
  .nav { position: fixed; top: 66px; left: 14px; right: 14px; display: none; padding: 10px; border: 1px solid var(--line); border-radius: 8px; background: #fff; box-shadow: var(--shadow); }
  .nav.open { display: grid; }
  .nav a { width: 100%; }
  .hero { min-height: 720px; }
  .hero-content { padding: 100px 0 80px; }
  .hero::after { background: linear-gradient(0deg, rgba(5,21,41,.96), rgba(5,21,41,.52)); }
  .trust-grid, .feature-grid, .process, .metric-grid { grid-template-columns: 1fr 1fr; }
  .split, .footer-grid, .doc-layout { grid-template-columns: 1fr; gap: 34px; }
  .toc { position: static; }
}
@media (max-width: 520px) {
  .shell { width: calc(100% - 24px); }
  .brand img { width: 180px; }
  .hero h1 { font-size: 42px; }
  .hero .lead { font-size: 16px; }
  .trust-grid, .feature-grid, .process, .metric-grid { grid-template-columns: 1fr; }
  .trust-item { border-left: 0; border-bottom: 1px solid rgba(255,255,255,.13); }
  .band { padding: 66px 0; }
  .page-hero { padding: 70px 0 48px; }
  .document table { display: block; overflow-x: auto; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation: none !important; transition: none !important; }
  .reveal { opacity: 1; transform: none; }
}