:root {
  --hd-ink: #071421;
  --hd-ink-2: #0d2133;
  --hd-paper: #f5f7f8;
  --hd-white: #ffffff;
  --hd-muted: #aebac4;
  --hd-amber: #f6a51b;
  --hd-amber-deep: #d98600;
  --hd-line: rgba(255, 255, 255, 0.16);
  --hd-shell: min(1200px, calc(100% - 48px));
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; font-family: "Noto Sans KR", "Malgun Gothic", sans-serif; color: var(--hd-ink); background: var(--hd-paper); }
a { color: inherit; text-decoration: none; }
button { font: inherit; }
.hd-shell { width: var(--hd-shell); margin-inline: auto; }
.hd-skip-link { position: fixed; left: 1rem; top: -5rem; z-index: 999; padding: .8rem 1rem; background: var(--hd-amber); color: var(--hd-ink); font-weight: 700; }
.hd-skip-link:focus { top: 1rem; }

.hd-site-header { position: fixed; inset: 0 0 auto; z-index: 50; color: var(--hd-white); border-bottom: 1px solid var(--hd-line); transition: background .25s ease, border-color .25s ease; }
.hd-site-header.hd-is-scrolled { background: rgba(7, 20, 33, .95); border-color: rgba(255,255,255,.09); backdrop-filter: blur(16px); }
.hd-header-inner { height: 88px; display: flex; align-items: center; justify-content: space-between; }
.hd-brand { display: flex; align-items: center; gap: 13px; }
.hd-brand-mark { width: 39px; height: 39px; display: grid; grid-template-columns: repeat(3, 1fr); gap: 3px; align-items: end; padding: 5px; border: 1px solid rgba(255,255,255,.35); }
.hd-brand-mark i { display: block; background: var(--hd-amber); }
.hd-brand-mark i:nth-child(1) { height: 55%; }.hd-brand-mark i:nth-child(2) { height: 100%; }.hd-brand-mark i:nth-child(3) { height: 75%; }
.hd-brand-copy { display: grid; gap: 2px; }
.hd-brand-copy strong { font-size: 1rem; letter-spacing: -.02em; }
.hd-brand-copy small { font-size: .75rem; color: rgba(255,255,255,.6); letter-spacing: .08em; }
.hd-desktop-nav { display: flex; align-items: center; gap: 34px; font-size: .91rem; font-weight: 600; }
.hd-desktop-nav > a:not(.hd-nav-contact) { position: relative; }
.hd-desktop-nav > a:not(.hd-nav-contact)::after { content: ""; position: absolute; left: 0; right: 100%; bottom: -9px; height: 2px; background: var(--hd-amber); transition: right .2s; }
.hd-desktop-nav > a:hover::after, .hd-desktop-nav > a:focus-visible::after { right: 0; }
.hd-nav-contact { padding: .72rem 1rem; border: 1px solid rgba(255,255,255,.4); font-variant-numeric: tabular-nums; }
.hd-menu-toggle, .hd-mobile-nav { display: none; }

.hd-hero { min-height: 780px; height: 100svh; max-height: 980px; position: relative; display: grid; align-items: center; overflow: hidden; color: var(--hd-white); background: var(--hd-ink); }
.hd-hero-image { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; object-position: center; opacity: .84; }
.hd-hero-shade { position: absolute; inset: 0; background: linear-gradient(90deg, rgba(4,13,22,.98) 0%, rgba(4,13,22,.84) 36%, rgba(4,13,22,.18) 70%, rgba(4,13,22,.35) 100%), linear-gradient(0deg, rgba(4,13,22,.7) 0%, transparent 38%); }
.hd-hero-grid { position: absolute; inset: 0; opacity: .1; background-image: linear-gradient(rgba(255,255,255,.32) 1px, transparent 1px), linear-gradient(90deg, rgba(255,255,255,.32) 1px, transparent 1px); background-size: 72px 72px; mask-image: linear-gradient(90deg, black, transparent 62%); }
.hd-hero-inner { position: relative; z-index: 2; padding-top: 82px; display: grid; grid-template-columns: minmax(0, 1fr) 250px; gap: clamp(3rem, 8vw, 8rem); align-items: end; }
.hd-hero-copy { max-width: 740px; }
.hd-eyebrow { margin: 0 0 24px; font-size: .75rem; font-weight: 700; letter-spacing: .18em; color: #d4dce2; display: flex; align-items: center; gap: 11px; }
.hd-eyebrow span { width: 30px; height: 2px; background: var(--hd-amber); }
.hd-hero h1 { margin: 0; font-size: clamp(3.1rem, 6vw, 5.6rem); line-height: 1.1; letter-spacing: -.055em; font-weight: 800; text-wrap: balance; }
.hd-hero h1 em { color: var(--hd-amber); font-style: normal; }
.hd-hero-lead { margin: 30px 0 0; font-size: clamp(1rem, 1.4vw, 1.2rem); line-height: 1.85; color: #d2dbe2; font-weight: 400; }
.hd-hero-actions { display: flex; gap: 12px; margin-top: 40px; }
.hd-button { min-height: 54px; display: inline-flex; align-items: center; justify-content: center; gap: 22px; padding: 0 24px; font-size: .96rem; font-weight: 700; border: 1px solid transparent; transition: transform .2s, background .2s, color .2s; }
.hd-button:hover { transform: translateY(-2px); }
.hd-button svg { width: 19px; fill: none; stroke: currentColor; stroke-width: 1.7; }
.hd-button-primary { background: var(--hd-amber); color: var(--hd-ink); }
.hd-button-primary:hover { background: #ffb834; }
.hd-button-ghost { color: var(--hd-white); border-color: rgba(255,255,255,.45); background: rgba(7,20,33,.15); }
.hd-button-ghost:hover { background: rgba(255,255,255,.1); }
.hd-hero-note { align-self: end; margin-bottom: 12px; padding: 26px 0 5px 24px; border-left: 1px solid rgba(255,255,255,.35); }
.hd-note-index { font-size: .75rem; letter-spacing: .1em; color: var(--hd-amber); }
.hd-hero-note strong { display: block; margin-top: 14px; font-size: 1.14rem; line-height: 1.65; }
.hd-note-rule { margin: 22px 0; height: 1px; background: rgba(255,255,255,.22); }
.hd-hero-note dl { margin: 0; display: grid; gap: 12px; }
.hd-hero-note dl div { display: flex; justify-content: space-between; gap: 12px; font-size: .78rem; }
.hd-hero-note dt { color: #8999a6; }.hd-hero-note dd { margin: 0; color: #e2e7ea; }
.hd-hero-rail { position: absolute; right: 20px; top: 50%; z-index: 2; transform: translateY(-50%); display: flex; align-items: center; gap: 12px; writing-mode: vertical-rl; font-size: .75rem; letter-spacing: .1em; color: rgba(255,255,255,.44); }
.hd-hero-rail i { height: 72px; width: 1px; background: rgba(255,255,255,.35); }
.hd-service-strip { background: var(--hd-amber); color: var(--hd-ink); }
.hd-strip-inner { min-height: 70px; display: grid; grid-template-columns: repeat(4, 1fr); align-items: center; }
.hd-strip-inner span { padding: 0 24px; font-size: .82rem; font-weight: 700; border-right: 1px solid rgba(7,20,33,.18); }
.hd-strip-inner span:first-child { padding-left: 0; }.hd-strip-inner span:last-child { border: 0; }

.hd-section { padding: clamp(96px, 10vw, 150px) 0; }
.hd-section-kicker { margin: 0 0 20px; color: var(--hd-amber-deep); font-size: .78rem; line-height: 1; font-weight: 800; letter-spacing: .16em; }
.hd-section-kicker.hd-light { color: var(--hd-amber); }
.hd-section-heading { display: grid; grid-template-columns: 1.2fr .8fr; gap: clamp(3rem, 8vw, 7rem); align-items: end; margin-bottom: 64px; }
.hd-section-heading h2, .hd-method h2, .hd-standards-copy h2, .hd-company-copy h2, .hd-contact h2 { margin: 0; font-size: clamp(2.35rem, 4.4vw, 4rem); line-height: 1.22; letter-spacing: -.055em; }
.hd-heading-copy { margin: 0 0 5px; color: #5b6871; font-size: 1.03rem; line-height: 1.9; word-break: keep-all; }

.hd-services { background: #f5f7f8; }
.hd-service-grid { display: grid; grid-template-columns: repeat(3, 1fr); border-top: 1px solid #cdd4d9; border-left: 1px solid #cdd4d9; }
.hd-service-card { min-height: 390px; padding: 32px 30px 34px; display: flex; flex-direction: column; background: #fff; border-right: 1px solid #cdd4d9; border-bottom: 1px solid #cdd4d9; transition: background .25s, transform .25s, box-shadow .25s; }
.hd-service-card:hover { position: relative; z-index: 2; transform: translateY(-5px); background: #fffdf8; box-shadow: 0 20px 52px rgba(7,20,33,.13); }
.hd-card-top { display: flex; justify-content: space-between; align-items: flex-start; }
.hd-card-top span { font-size: .78rem; font-weight: 800; color: #97a2aa; font-variant-numeric: tabular-nums; }
.hd-card-top svg { width: 38px; height: 38px; fill: none; stroke: var(--hd-amber-deep); stroke-width: 1.35; stroke-linecap: round; stroke-linejoin: round; }
.hd-service-card h3 { margin: 56px 0 18px; font-size: 1.4rem; letter-spacing: -.035em; }
.hd-service-card p { margin: 0; color: #5f6b73; font-size: .96rem; line-height: 1.85; word-break: keep-all; }
.hd-service-card ul { display: flex; flex-wrap: wrap; gap: 7px; margin: auto 0 0; padding: 28px 0 0; list-style: none; }
.hd-service-card li { padding: 7px 10px; color: #4c5963; border: 1px solid #d7dde1; font-size: .77rem; font-weight: 600; }

.hd-method { position: relative; overflow: hidden; color: white; background: var(--hd-ink); }
.hd-method-backdrop { position: absolute; inset: 0; overflow: hidden; pointer-events: none; }
.hd-method-backdrop::before { content: ""; position: absolute; inset: 0; opacity: .11; background-image: linear-gradient(rgba(255,255,255,.28) 1px, transparent 1px), linear-gradient(90deg, rgba(255,255,255,.28) 1px, transparent 1px); background-size: 56px 56px; }
.hd-method-backdrop span { position: absolute; right: -1vw; bottom: -4vw; color: transparent; -webkit-text-stroke: 1px rgba(255,255,255,.09); font-size: clamp(6rem, 16vw, 15rem); font-weight: 900; letter-spacing: -.08em; }
.hd-method-inner { position: relative; display: grid; grid-template-columns: .78fr 1.22fr; gap: clamp(4rem, 9vw, 9rem); }
.hd-method-intro > p:last-child { max-width: 460px; margin: 28px 0 0; color: #aebac4; font-size: 1rem; line-height: 1.9; word-break: keep-all; }
.hd-process-list { margin: 0; padding: 0; list-style: none; border-top: 1px solid rgba(255,255,255,.22); }
.hd-process-list li { display: grid; grid-template-columns: 64px 1fr; gap: 20px; padding: 28px 4px; border-bottom: 1px solid rgba(255,255,255,.16); }
.hd-process-list li > span { color: var(--hd-amber); font-size: .78rem; font-weight: 800; }
.hd-process-list strong { font-size: 1.18rem; }
.hd-process-list p { margin: 9px 0 0; color: #aab6bf; font-size: .94rem; line-height: 1.7; word-break: keep-all; }

.hd-standards { background: #e8ecef; }
.hd-standards-layout { display: grid; grid-template-columns: 1fr 1fr; gap: clamp(4rem, 9vw, 9rem); align-items: center; }
.hd-standards-visual { position: relative; aspect-ratio: 1 / 1.04; padding: 28px; color: white; background: #0b2236; box-shadow: 0 28px 70px rgba(7,20,33,.17); overflow: hidden; }
.hd-standards-visual::before { content: ""; position: absolute; inset: 0; opacity: .22; background-image: linear-gradient(rgba(255,255,255,.26) 1px, transparent 1px), linear-gradient(90deg, rgba(255,255,255,.26) 1px, transparent 1px); background-size: 34px 34px; }
.hd-drawing-label { position: relative; display: flex; justify-content: space-between; font-size: .75rem; letter-spacing: .1em; color: #a6b9c8; }
.hd-drawing-label b { color: var(--hd-amber); }
.hd-structure-drawing { position: absolute; inset: 24% 12% 18%; border: 1px dashed rgba(255,255,255,.25); }
.hd-beam, .hd-column { position: absolute; display: block; background: rgba(255,255,255,.06); border: 2px solid #dce7ee; }
.hd-beam { left: 8%; right: 8%; height: 13%; }.hd-beam-top { top: 10%; }.hd-beam-mid { top: 52%; }
.hd-column { top: 10%; bottom: 8%; width: 13%; }.hd-column-a { left: 16%; }.hd-column-b { right: 16%; }
.hd-point { position: absolute; width: 14px; height: 14px; border: 3px solid var(--hd-amber); border-radius: 50%; box-shadow: 0 0 0 5px rgba(246,165,27,.13); }
.hd-point-a { left: 21%; top: 33%; }.hd-point-b { right: 21%; top: 12%; }.hd-point-c { right: 21%; top: 68%; }
.hd-structure-drawing small { position: absolute; color: var(--hd-amber); font-size: .75rem; font-weight: 700; }
.hd-label-a { left: 4%; top: 30%; }.hd-label-b { right: 2%; top: 4%; }.hd-label-c { right: 1%; bottom: 11%; }
.hd-standards-visual > p { position: absolute; left: 28px; bottom: 22px; margin: 0; color: #8ba0b0; font-size: .75rem; letter-spacing: .12em; }
.hd-standards-lead { margin: 26px 0 42px; color: #52616b; font-size: 1.04rem; line-height: 1.9; word-break: keep-all; }
.hd-standard-points { border-top: 1px solid #bcc6cd; }
.hd-standard-points article { display: grid; grid-template-columns: 45px 1fr; gap: 15px; padding: 22px 0; border-bottom: 1px solid #c5cdd3; }
.hd-standard-points article > span { padding-top: 4px; color: var(--hd-amber-deep); font-size: .75rem; font-weight: 800; }
.hd-standard-points h3 { margin: 0; font-size: 1.05rem; }
.hd-standard-points p { margin: 8px 0 0; color: #69757d; font-size: .91rem; line-height: 1.7; word-break: keep-all; }

.hd-company { background: #fff; }
.hd-company-layout { display: grid; grid-template-columns: 1fr .82fr; gap: clamp(4rem, 11vw, 10rem); align-items: end; }
.hd-company-copy > p:not(.hd-section-kicker) { max-width: 650px; margin: 26px 0 0; color: #59666f; font-size: 1rem; line-height: 1.9; word-break: keep-all; }
.hd-company-facts { margin: 0; border-top: 2px solid var(--hd-ink); }
.hd-company-facts > div { display: grid; grid-template-columns: 92px 1fr; padding: 26px 0; border-bottom: 1px solid #cfd6db; }
.hd-company-facts dt { color: #717e87; font-size: .82rem; font-weight: 700; }
.hd-company-facts dd { margin: 0; display: grid; gap: 5px; }
.hd-company-facts strong { font-size: 1.2rem; letter-spacing: -.025em; }
.hd-company-facts dd span { color: #77838b; font-size: .84rem; }

.hd-contact { position: relative; overflow: hidden; padding: 76px 0; color: white; background: #132a3e; }
.hd-contact-pattern { position: absolute; inset: 0; opacity: .13; background-image: linear-gradient(120deg, transparent 44%, var(--hd-amber) 44%, var(--hd-amber) 45%, transparent 45%), linear-gradient(60deg, transparent 64%, white 64%, white 65%, transparent 65%); }
.hd-contact-inner { position: relative; display: flex; align-items: flex-end; justify-content: space-between; gap: 3rem; }
.hd-contact h2 { font-size: clamp(2rem, 3.6vw, 3.2rem); }
.hd-contact-inner > div > p:last-child { margin: 18px 0 0; color: #bbc6ce; }
.hd-contact-call { min-width: 365px; display: grid; grid-template-columns: 1fr auto; grid-template-rows: auto auto; column-gap: 28px; padding: 22px 26px; color: var(--hd-ink); background: var(--hd-amber); transition: background .2s, transform .2s; }
.hd-contact-call:hover { background: #ffb735; transform: translateY(-3px); }
.hd-contact-call span { font-size: .76rem; font-weight: 700; }.hd-contact-call strong { grid-column: 1; margin-top: 4px; font-size: 1.85rem; letter-spacing: -.03em; font-variant-numeric: tabular-nums; }.hd-contact-call i { grid-column: 2; grid-row: 1 / 3; align-self: center; font-size: 2rem; font-style: normal; }

.hd-site-footer { padding: 62px 0 28px; color: #b5c0c8; background: #071421; }
.hd-footer-main { display: grid; grid-template-columns: 1fr 1.7fr auto; gap: clamp(2rem, 6vw, 6rem); align-items: start; }
.hd-footer-brand { display: flex; align-items: center; gap: 14px; color: white; }
.hd-footer-brand strong { font-size: 1.02rem; }.hd-footer-brand p { margin: 4px 0 0; color: #71818d; font-size: .75rem; letter-spacing: .04em; }
.hd-site-footer address { display: grid; gap: 11px; font-style: normal; }
.hd-site-footer address p { margin: 0; display: flex; flex-wrap: wrap; gap: 8px 14px; font-size: .78rem; line-height: 1.7; }
.hd-site-footer address b { color: #71818d; font-weight: 600; }.hd-site-footer address a:hover { color: var(--hd-amber); }
.hd-to-top { width: 58px; height: 58px; display: grid; place-content: center; gap: 3px; border: 1px solid #42515d; text-align: center; }
.hd-to-top span { font-size: .75rem; }.hd-to-top svg { width: 22px; fill: none; stroke: var(--hd-amber); stroke-width: 1.7; }
.hd-footer-bottom { display: flex; justify-content: space-between; gap: 2rem; margin-top: 50px; padding-top: 22px; border-top: 1px solid #263744; }
.hd-footer-bottom p { margin: 0; color: #687a87; font-size: .75rem; }

.hd-reveal { opacity: 0; transform: translateY(24px); transition: opacity .65s ease, transform .65s ease; }
.hd-reveal.hd-is-visible { opacity: 1; transform: none; }

@media (max-width: 900px) {
  :root { --hd-shell: min(100% - 32px, 720px); }
  .hd-header-inner { height: 74px; }
  .hd-desktop-nav { display: none; }
  .hd-menu-toggle { width: 42px; height: 42px; display: grid; place-content: center; gap: 7px; border: 0; color: white; background: transparent; cursor: pointer; }
  .hd-menu-toggle span { width: 24px; height: 2px; background: currentColor; transition: transform .2s; }
  .hd-menu-toggle[aria-expanded="true"] span:first-child { transform: translateY(4.5px) rotate(45deg); }
  .hd-menu-toggle[aria-expanded="true"] span:last-child { transform: translateY(-4.5px) rotate(-45deg); }
  .hd-mobile-nav { position: absolute; left: 0; right: 0; top: 74px; padding: 12px 16px 20px; background: rgba(7,20,33,.98); border-bottom: 1px solid rgba(255,255,255,.12); }
  .hd-mobile-nav.hd-is-open { display: grid; }
  .hd-mobile-nav a { padding: 15px 6px; border-bottom: 1px solid rgba(255,255,255,.1); font-weight: 600; }
  .hd-hero { height: auto; min-height: 760px; }
  .hd-hero-image { object-position: 59% center; opacity: .6; }
  .hd-hero-shade { background: linear-gradient(90deg, rgba(4,13,22,.96), rgba(4,13,22,.44)), linear-gradient(0deg, rgba(4,13,22,.9), transparent 60%); }
  .hd-hero-inner { padding-top: 118px; padding-bottom: 62px; grid-template-columns: 1fr; align-items: center; }
  .hd-hero-copy { align-self: center; }
  .hd-hero-note { display: none; }
  .hd-hero-rail { display: none; }
  .hd-strip-inner { grid-template-columns: 1fr 1fr; padding: 12px 0; }
  .hd-strip-inner span { padding: 11px 10px; border: 0; }
  .hd-strip-inner span:first-child { padding-left: 10px; }
  .hd-section-heading, .hd-method-inner, .hd-standards-layout, .hd-company-layout { grid-template-columns: 1fr; }
  .hd-section-heading { gap: 26px; margin-bottom: 48px; }
  .hd-service-grid { grid-template-columns: 1fr 1fr; }
  .hd-service-card { min-height: 370px; }
  .hd-method-inner { gap: 50px; }
  .hd-method-intro > p:last-child { max-width: 600px; }
  .hd-standards-visual { max-width: 610px; width: 100%; aspect-ratio: 1.3 / 1; }
  .hd-company-layout { gap: 58px; }
  .hd-contact-inner { align-items: stretch; flex-direction: column; }
  .hd-contact-call { min-width: 0; width: min(100%, 430px); }
  .hd-footer-main { grid-template-columns: 1fr auto; }
  .hd-site-footer address { grid-column: 1 / -1; grid-row: 2; }
}

@media (max-width: 540px) {
  .hd-brand-copy small { display: none; }
  .hd-brand-copy strong { font-size: .92rem; }
  .hd-hero { min-height: 720px; }
  .hd-hero h1 { font-size: clamp(2.65rem, 12vw, 3.7rem); }
  .hd-hero-lead br { display: none; }
  .hd-hero-actions { align-items: stretch; flex-direction: column; }
  .hd-button { width: 100%; }
  .hd-strip-inner { grid-template-columns: 1fr; }
  .hd-strip-inner span { border-bottom: 1px solid rgba(7,20,33,.14); }
  .hd-section { padding: 82px 0; }
  .hd-service-grid { grid-template-columns: 1fr; }
  .hd-service-card { min-height: 350px; }
  .hd-method-backdrop span { writing-mode: vertical-rl; right: -10vw; bottom: 0; }
  .hd-process-list li { grid-template-columns: 42px 1fr; gap: 10px; }
  .hd-standards-visual { aspect-ratio: .88 / 1; padding: 20px; }
  .hd-structure-drawing { inset: 24% 8% 18%; }
  .hd-company-facts > div { grid-template-columns: 72px 1fr; }
  .hd-contact { padding: 64px 0; }
  .hd-contact-call strong { font-size: 1.55rem; }
  .hd-footer-main { grid-template-columns: 1fr; }
  .hd-to-top { grid-column: 1; grid-row: 3; }
  .hd-site-footer address { grid-column: 1; grid-row: 2; }
  .hd-footer-bottom { align-items: flex-start; flex-direction: column; }
}

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