:root {
  --navy: #071f45;
  --navy-2: #0a3a79;
  --blue: #1764aa;
  --green: #3d9347;
  --green-bright: #72bd55;
  --ink: #12233b;
  --muted: #5f7087;
  --line: #d8e3ee;
  --pale: #f4f8fb;
  --white: #ffffff;
  --max: 1180px;
  --shadow: 0 30px 80px rgba(4, 31, 70, 0.16);
  --shadow-soft: 0 18px 45px rgba(4, 31, 70, 0.08);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; color: var(--ink); background: var(--white); font-family: Inter, Pretendard, "Noto Sans KR", "Segoe UI", Arial, sans-serif; font-size: 1rem; line-height: 1.65; -webkit-font-smoothing: antialiased; text-rendering: optimizeLegibility; }
img { max-width: 100%; display: block; }
a { color: inherit; }
a:focus-visible, button:focus-visible { outline: 3px solid rgba(61,147,71,.42); outline-offset: 4px; }
h1, h2, h3, p { margin-top: 0; }
h1, h2, h3 { color: var(--navy); line-height: 1.08; letter-spacing: -0.038em; }
h1 { font-size: clamp(3rem, 6.1vw, 5.75rem); margin-bottom: 1.65rem; max-width: 850px; font-weight: 780; }
h2 { font-size: clamp(2.35rem, 3.9vw, 4rem); margin-bottom: 1.3rem; font-weight: 760; }
h3 { font-size: 1.35rem; margin-bottom: .65rem; }
p { color: var(--muted); }
section { scroll-margin-top: 88px; }
.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: fixed; left: 1rem; top: -5rem; z-index: 1000; padding: .75rem 1rem; background: var(--navy); color: white; border-radius: .5rem; }
.skip-link:focus { top: 1rem; }

.site-header { position: sticky; top: 0; z-index: 50; border-bottom: 1px solid rgba(206,219,232,.76); background: rgba(255,255,255,.9); box-shadow: 0 8px 28px rgba(6,31,68,.035); backdrop-filter: blur(20px) saturate(150%); }
.nav-shell, .section-shell, .hero-shell, .footer-shell { width: min(calc(100% - 2.5rem), var(--max)); margin-inline: auto; }
.nav-shell { height: 86px; display: flex; align-items: center; justify-content: space-between; gap: 2rem; }
.brand { display: inline-flex; align-items: center; }
.brand img { width: 176px; height: auto; }
.primary-nav { display: flex; align-items: center; gap: clamp(1rem, 2.2vw, 2rem); }
.primary-nav a { position: relative; text-decoration: none; color: #2a405d; font-weight: 680; font-size: .92rem; transition: color .2s ease; }
.primary-nav a:not(.nav-cta)::after { content: ""; position: absolute; left: 0; right: 100%; bottom: -.55rem; height: 2px; background: var(--green); transition: right .22s ease; }
.primary-nav a:not(.nav-cta):hover { color: var(--navy); }
.primary-nav a:not(.nav-cta):hover::after { right: 0; }
.nav-cta { padding: .72rem 1.08rem; border: 1px solid var(--navy); border-radius: 999px; transition: background .2s ease, color .2s ease, transform .2s ease; }
.nav-cta:hover { color: white; background: var(--navy); transform: translateY(-1px); }
.lang-switch { display: flex; align-items: center; padding: 3px; border: 1px solid #c7d4e0; border-radius: 999px; background: rgba(240,246,251,.9); }
.lang-switch button { min-width: 48px; min-height: 30px; padding: .25rem .72rem; border: 0; border-radius: 999px; background: transparent; color: var(--muted); font: inherit; font-size: .76rem; font-weight: 800; cursor: pointer; }
.lang-switch button.active { background: var(--navy); color: white; box-shadow: 0 3px 8px rgba(6,41,95,.18); }
.nav-toggle { display: none; width: 44px; height: 44px; padding: 10px; border: 0; background: transparent; }
.nav-toggle span:not(.sr-only) { display: block; height: 2px; margin: 5px 0; background: var(--navy); }

.hero { position: relative; overflow: hidden; padding: clamp(5.5rem, 9vw, 9rem) 0 clamp(5.5rem, 8vw, 7.5rem); background: radial-gradient(circle at 85% 15%, rgba(50,139,205,.12), transparent 31%), linear-gradient(133deg, #fff 12%, #f7fafc 58%, #edf5fa 100%); }
.hero::before { content: ""; position: absolute; inset: 0; pointer-events: none; opacity: .32; background-image: linear-gradient(rgba(7,31,69,.035) 1px, transparent 1px), linear-gradient(90deg, rgba(7,31,69,.035) 1px, transparent 1px); background-size: 64px 64px; mask-image: linear-gradient(90deg, transparent 5%, black 58%, transparent 100%); }
.hero::after { content: ""; position: absolute; width: 38rem; height: 38rem; right: -13rem; top: -15rem; border: 1px solid rgba(23,100,170,.11); border-radius: 50%; box-shadow: 0 0 0 90px rgba(23,100,170,.022), 0 0 0 180px rgba(61,147,71,.014); }
.hero-shell { position: relative; z-index: 2; display: grid; grid-template-columns: 1.02fr .98fr; align-items: center; gap: clamp(2.5rem, 5vw, 5rem); }
.eyebrow { display: flex; align-items: center; gap: .65rem; margin-bottom: 1.15rem; color: var(--green); font-size: .78rem; line-height: 1.2; font-weight: 820; letter-spacing: .16em; text-transform: uppercase; }
.eyebrow::before { content: ""; width: 26px; height: 2px; flex: 0 0 auto; background: currentColor; }
.centered .eyebrow { justify-content: center; }
.eyebrow.light { color: #8ed477; }
.hero h1 span { color: var(--green); }
.hero-lede { max-width: 650px; margin-bottom: 2.2rem; font-size: clamp(1.07rem, 1.65vw, 1.22rem); line-height: 1.75; }
.hero-actions { display: flex; flex-wrap: wrap; gap: .8rem; }
.button { display: inline-flex; min-height: 52px; align-items: center; justify-content: center; gap: .5rem; padding: .82rem 1.35rem; border-radius: .7rem; text-decoration: none; font-weight: 760; transition: transform .2s ease, box-shadow .2s ease, background .2s ease; }
.button:hover { transform: translateY(-2px); }
.button-primary { background: linear-gradient(135deg, var(--navy), #0c468c); color: white; box-shadow: 0 15px 34px rgba(6,41,95,.22); }
.button-primary:hover { background: var(--navy-2); }
.button-secondary { border: 1px solid #b9c8d8; background: white; color: var(--navy); }
.hero-proof { display: grid; grid-template-columns: repeat(3, 1fr); gap: .5rem; margin-top: 3.25rem; padding: .65rem; border: 1px solid rgba(204,218,231,.8); border-radius: 1rem; background: rgba(255,255,255,.65); box-shadow: 0 14px 34px rgba(7,31,69,.05); backdrop-filter: blur(10px); }
.hero-proof div { padding: .72rem .78rem; border-right: 1px solid var(--line); }
.hero-proof div:last-child { border-right: 0; }
.hero-proof strong, .hero-proof span { display: block; }
.hero-proof strong { color: var(--navy); font-size: .94rem; }
.hero-proof span { color: var(--muted); font-size: .82rem; }
.hero-visual { position: relative; margin: 0; padding: .72rem; border: 1px solid rgba(207,219,231,.92); border-radius: 1.65rem; background: rgba(255,255,255,.97); box-shadow: var(--shadow); }
.hero-visual img { width: 100%; aspect-ratio: 523 / 270; object-fit: cover; object-position: center; border-radius: 1.08rem; }
.hero-visual figcaption { display: flex; align-items: center; gap: .65rem; padding: 1rem .85rem .48rem; color: var(--navy); font-weight: 760; font-size: .82rem; letter-spacing: .025em; }
.hero-visual figcaption::before { content: ""; width: 7px; height: 7px; flex: 0 0 auto; border-radius: 50%; background: var(--green-bright); box-shadow: 0 0 0 5px rgba(114,189,85,.13); }

.section { padding: clamp(5.5rem, 9vw, 9rem) 0; }
.section-heading { max-width: 800px; margin-bottom: clamp(2.5rem, 5vw, 4.5rem); }
.section-heading > p:last-child { font-size: 1.08rem; }
.split-heading { max-width: none; display: grid; grid-template-columns: 1.35fr .65fr; gap: 4rem; align-items: end; }
.split-heading h2 { max-width: 780px; margin-bottom: 0; }
.split-heading > p { margin-bottom: .4rem; }
.centered { margin-inline: auto; text-align: center; }

.solution-section { background: linear-gradient(180deg, #f7fafc 0%, #eef4f8 100%); }
.energy-flow { list-style: none; padding: 0; margin: 0; display: grid; grid-template-columns: repeat(4, 1fr); gap: 1rem; }
.energy-flow li { position: relative; min-height: 250px; padding: 1.7rem 1.55rem; overflow: hidden; border: 1px solid rgba(208,221,233,.95); border-radius: 1rem; background: rgba(255,255,255,.94); box-shadow: 0 12px 32px rgba(7,44,91,.055); transition: transform .22s ease, box-shadow .22s ease, border-color .22s ease; }
.energy-flow li:hover { transform: translateY(-5px); border-color: #adc8df; box-shadow: 0 22px 42px rgba(7,44,91,.1); }
.energy-flow li::before { content: ""; position: absolute; left: 0; top: 0; width: 100%; height: 3px; background: linear-gradient(90deg, var(--blue), var(--green-bright)); }
.energy-flow li:last-child { grid-column: 3 / 5; min-height: 220px; background: linear-gradient(135deg, #fff, #f2f8f2); }
.stage-number { display: inline-grid; place-items: center; width: 38px; height: 38px; margin-bottom: 2.15rem; border: 1px solid rgba(61,147,71,.26); border-radius: 50%; background: rgba(61,147,71,.08); color: var(--green); font-size: .76rem; font-weight: 850; letter-spacing: .05em; }
.energy-flow h3 { font-size: 1.18rem; letter-spacing: -.025em; }
.energy-flow p { margin: 0; font-size: .9rem; line-height: 1.62; }

.delivery-section { position: relative; overflow: hidden; color: white; background: radial-gradient(circle at 90% 0%, rgba(41,113,180,.35), transparent 35%), linear-gradient(145deg, #061b3d, #082c5d 70%, #07386b); }
.delivery-section h2, .delivery-section h3 { color: white; }
.delivery-section .section-heading > p:last-child { color: #b9cbe1; }
.delivery-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 1rem; }
.delivery-grid article { min-height: 315px; padding: clamp(2rem, 4vw, 3.2rem); border: 1px solid rgba(255,255,255,.14); border-radius: 1rem; background: rgba(255,255,255,.055); box-shadow: inset 0 1px 0 rgba(255,255,255,.05); transition: background .2s ease, transform .2s ease, border-color .2s ease; }
.delivery-grid article:hover { transform: translateY(-4px); border-color: rgba(142,212,119,.36); background: rgba(255,255,255,.085); }
.delivery-grid article > span { display: inline-grid; place-items: center; width: 40px; height: 40px; margin-bottom: 1.5rem; border: 1px solid rgba(142,212,119,.55); border-radius: 50%; color: #8ed477; font-weight: 800; }
.delivery-grid ul { margin: 0; padding-left: 1.1rem; color: #cbd8e8; }
.delivery-grid li { margin: .5rem 0; }

.applications-section { background: linear-gradient(180deg, #fff 0%, #f8fafc 100%); }
.application-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1rem; }
.application-grid article { min-height: 300px; padding: 2rem; border: 1px solid var(--line); border-radius: 1rem; background: linear-gradient(150deg, #fff 70%, #f2f7fa); box-shadow: 0 10px 28px rgba(7,44,91,.04); transition: transform .22s ease, box-shadow .22s ease, border-color .22s ease; }
.application-grid article:hover { transform: translateY(-6px); border-color: #a8c6e1; box-shadow: 0 20px 38px rgba(7,44,91,.08); }
.application-grid span { display: inline-block; margin-bottom: 4.25rem; padding: .38rem .65rem; border: 1px solid rgba(61,147,71,.18); border-radius: 999px; background: rgba(61,147,71,.07); color: var(--green); font-size: .7rem; font-weight: 850; letter-spacing: .12em; }
.application-grid p { margin: 0; }

.advantages-section { background: radial-gradient(circle at 8% 0%, rgba(68,135,199,.27), transparent 28%), linear-gradient(135deg, #061b3c, #082f65 62%, #0a4274); }
.advantage-layout { display: grid; grid-template-columns: .8fr 1.2fr; gap: clamp(3rem, 7vw, 7rem); align-items: start; }
.advantage-intro { position: sticky; top: 125px; }
.advantage-intro h2 { color: white; }
.advantage-intro > p:not(.eyebrow) { color: #c7d5e7; font-size: 1.08rem; }
.text-link { display: inline-flex; gap: .6rem; align-items: center; margin-top: 1.5rem; color: #9ee285; text-decoration: none; font-weight: 750; }
.advantage-list { display: grid; gap: .75rem; }
.advantage-list article { display: grid; grid-template-columns: 58px 1fr; gap: 1rem; padding: 1.45rem 1.5rem; border: 1px solid rgba(255,255,255,.13); border-radius: .9rem; background: rgba(255,255,255,.045); transition: transform .2s ease, background .2s ease; }
.advantage-list article:hover { transform: translateX(4px); background: rgba(255,255,255,.075); }
.advantage-list b { color: #8ed477; font-size: .85rem; letter-spacing: .1em; }
.advantage-list h3 { color: white; margin-bottom: .35rem; }
.advantage-list p { color: #bfcde0; margin: 0; }

.process-section { background: white; }
.process-track { list-style: none; display: grid; grid-template-columns: repeat(6, 1fr); gap: 0; padding: 0; margin: 0; }
.process-track li { position: relative; text-align: center; padding: 0 .85rem; }
.process-track li:not(:last-child)::after { content: ""; position: absolute; top: 24px; left: calc(50% + 35px); width: calc(100% - 70px); height: 2px; background: linear-gradient(90deg, var(--green), var(--blue)); }
.process-track span { position: relative; z-index: 2; display: grid; place-items: center; width: 52px; height: 52px; margin: 0 auto 1.35rem; border: 1px solid #174b83; border-radius: 50%; background: linear-gradient(145deg, #0b3974, #061d42); color: white; font-weight: 800; box-shadow: 0 0 0 7px white, 0 10px 24px rgba(6,41,95,.16); }
.process-track h3 { font-size: 1.05rem; }
.process-track p { font-size: .85rem; line-height: 1.45; }

.partner-strip { padding: 2.8rem 0; border-top: 1px solid var(--line); background: linear-gradient(90deg, #f3f7fa, #edf4f7); }
.partner-inner { display: flex; align-items: center; justify-content: space-between; gap: 2rem; }
.partner-inner .eyebrow { margin-bottom: .45rem; }
.partner-inner p { margin-bottom: 0; }
.partner-names { display: flex; flex-wrap: wrap; gap: .75rem; }
.partner-names span { min-width: 190px; padding: .78rem 1.1rem; border: 1px solid #bdd0e0; border-radius: 999px; background: rgba(255,255,255,.94); box-shadow: 0 8px 20px rgba(7,44,91,.045); color: var(--navy); text-align: center; font-weight: 800; }
.partner-names span:last-child { border-color: #afd0ac; color: #2e7a34; }

.contact-section { position: relative; overflow: hidden; padding: clamp(5.5rem, 8vw, 7.5rem) 0; background: radial-gradient(circle at 18% 105%, rgba(101,183,81,.18), transparent 30%), linear-gradient(120deg, #082d61, #0a4a72); }
.contact-inner { display: grid; grid-template-columns: 1fr 1fr; align-items: end; gap: clamp(2.5rem, 7vw, 7rem); }
.contact-inner h2 { max-width: 650px; margin-bottom: 0; color: white; }
.contact-links { display: grid; gap: .8rem; }
.contact-links a, .contact-links .contact-address { display: flex; align-items: center; justify-content: space-between; gap: 1rem; padding: 1.25rem 1.4rem; border: 1px solid rgba(255,255,255,.2); border-radius: .85rem; background: rgba(255,255,255,.075); box-shadow: inset 0 1px 0 rgba(255,255,255,.04); color: white; text-decoration: none; transition: background .2s ease, transform .2s ease, border-color .2s ease; }
.contact-links a:hover { transform: translateX(4px); background: rgba(255,255,255,.14); }
.contact-links span { color: #a8bdd4; font-size: .84rem; font-weight: 750; letter-spacing: .08em; text-transform: uppercase; }
.contact-links strong { font-size: 1.05rem; text-align: right; }
.contact-address strong { max-width: 380px; line-height: 1.45; }

footer { padding: 3.4rem 0; border-top: 1px solid rgba(255,255,255,.07); background: #041a39; }
.footer-shell { display: flex; align-items: center; justify-content: space-between; gap: 2rem; }
.footer-shell img { width: 150px; }
.footer-shell p { margin: .6rem 0 0; color: #9eb0c7; font-size: .86rem; }
.footer-shell a { color: white; text-decoration: none; font-weight: 700; }
.footer-contact { display: flex; flex-direction: column; gap: .2rem; }
.footer-contact a { color: #b9c9dc; font-size: .9rem; font-weight: 600; }
.footer-address { max-width: 420px; color: #8298b2; font-size: .82rem; line-height: 1.45; }

html[lang="ko"] body { word-break: keep-all; }
html[lang="ko"] h1 { font-size: clamp(2.8rem, 5.8vw, 5.4rem); }

@media (max-width: 1120px) {
  .nav-toggle { display: block; margin-left: auto; }
  .primary-nav { position: absolute; left: 0; right: 0; top: 86px; display: none; flex-direction: column; align-items: stretch; padding: 1.25rem; border-bottom: 1px solid var(--line); background: white; box-shadow: 0 18px 30px rgba(7,44,91,.1); }
  .primary-nav.open { display: flex; }
  .primary-nav a { padding: .65rem .25rem; font-size: 1rem; }
  .lang-switch { align-self: flex-start; margin: .25rem 0; }
  .nav-cta { text-align: center; }
}

@media (max-width: 1040px) {
  .primary-nav { gap: 1rem; }
  .primary-nav a { font-size: .87rem; }
  .energy-flow { grid-template-columns: repeat(4, 1fr); }
  .energy-flow li { min-height: 220px; }
  .application-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 800px) {
  .nav-shell { height: 74px; }
  .brand img { width: 150px; }
  .nav-toggle { display: block; }
  .primary-nav { position: absolute; left: 0; right: 0; top: 74px; display: none; flex-direction: column; align-items: stretch; padding: 1.25rem; border-bottom: 1px solid var(--line); background: white; box-shadow: 0 18px 30px rgba(7,44,91,.1); }
  .primary-nav.open { display: flex; }
  .primary-nav a { padding: .65rem .25rem; font-size: 1rem; }
  .nav-cta { text-align: center; }
  .hero { padding-top: 4rem; }
  .hero-shell, .split-heading, .advantage-layout, .contact-inner { grid-template-columns: 1fr; }
  .hero-visual { grid-row: 1; }
  .hero-proof { grid-template-columns: 1fr; gap: 1rem; }
  .hero-proof div { padding-left: 1rem; border-right: 0; border-left: 3px solid var(--green); }
  .split-heading { gap: 1.5rem; }
  .energy-flow { grid-template-columns: repeat(2, 1fr); }
  .energy-flow li:last-child { grid-column: 1 / 3; }
  .delivery-grid { grid-template-columns: 1fr; }
  .delivery-grid article { min-height: auto; }
  .advantage-intro { position: static; }
  .process-track { grid-template-columns: repeat(2, 1fr); gap: 2rem 0; }
  .process-track li::after { display: none; }
  .partner-inner, .footer-shell { align-items: flex-start; flex-direction: column; }
}

@media (max-width: 520px) {
  .nav-shell, .section-shell, .hero-shell, .footer-shell { width: min(calc(100% - 1.5rem), var(--max)); }
  h1 { font-size: clamp(2.75rem, 14vw, 4.2rem); }
  h2 { font-size: 2.3rem; }
  .hero-actions, .hero-actions .button { width: 100%; }
  .energy-flow, .application-grid { grid-template-columns: 1fr; }
  .energy-flow li, .energy-flow li:last-child { min-height: auto; grid-column: auto; }
  .application-grid article { min-height: 235px; }
  .application-grid span { margin-bottom: 2.6rem; }
  .process-track { grid-template-columns: 1fr; }
  .process-track li { display: grid; grid-template-columns: 54px 1fr; text-align: left; column-gap: 1rem; }
  .process-track span { grid-row: span 2; margin: 0; }
  .process-track h3, .process-track p { margin-bottom: .35rem; }
  .partner-names, .partner-names span { width: 100%; }
  .contact-links a, .contact-links .contact-address { align-items: flex-start; flex-direction: column; }
  .contact-links strong { text-align: left; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition-duration: .01ms !important; }
}