/* Layers: header 20, mobile navigation 30, skip link 40. */
:root {
  color-scheme: light;
  --page: #f4f5f1;
  --surface: #e9ece7;
  --surface-soft: #eef0eb;
  --ink: #182b3b;
  --muted: #59656a;
  --line: #d3d9d3;
  --accent: #ad491d;
  --on-accent: #fff8f3;
  --field: #fafbf8;
  --shadow: 0 18px 60px #263b4410;
  --radius: 4px;
  font-family: 'Pretendard', 'Noto Sans KR', 'Malgun Gothic', system-ui, sans-serif;
  font-synthesis: none;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    color-scheme: dark; --page: #101d27; --surface: #1b2b34; --surface-soft: #14232d;
    --ink: #eef1e9; --muted: #b3bdbf; --line: #34454c; --accent: #eda278;
    --on-accent: #192731; --field: #192b35; --shadow: 0 18px 60px #07111a30;
  }
}
:root[data-theme="dark"] {
  color-scheme: dark; --page: #101d27; --surface: #1b2b34; --surface-soft: #14232d;
  --ink: #eef1e9; --muted: #b3bdbf; --line: #34454c; --accent: #eda278;
  --on-accent: #192731; --field: #192b35; --shadow: 0 18px 60px #07111a30;
}
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 100px; }
body { margin: 0; color: var(--ink); background: var(--page); font-size: 16px; line-height: 1.7; word-break: keep-all; overflow-wrap: break-word; }
button, input, textarea, select { font: inherit; }
button, a, input, textarea, select, summary { -webkit-tap-highlight-color: transparent; }
button, a { touch-action: manipulation; }
button, summary { cursor: pointer; }
button { color: inherit; }
a { color: inherit; text-decoration: none; }
img { display: block; max-width: 100%; }
button:disabled { cursor: wait; opacity: .55; }
input:disabled { opacity: .5; }
:focus-visible { outline: 3px solid var(--accent); outline-offset: 5px; }
::selection { color: var(--on-accent); background: var(--accent); }
h1,h2,h3,p,figure { margin: 0; }
h1,h2,h3 { font-weight: 700; }
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip-path: inset(50%); border: 0; }
.skip-link { position: fixed; left: 16px; top: -100px; z-index: 40; background: var(--ink); color: var(--page); padding: 12px 20px; }
.skip-link:focus { top: 12px; }
.section-width { width: min(1360px, calc(100% - 112px)); margin-inline: auto; }
.section-space { padding-block: 112px; }
.header { position: sticky; top: 0; height: 82px; display: flex; align-items: center; justify-content: space-between; gap: 32px; padding-inline: 48px; border-bottom: 1px solid var(--line); background: var(--page); z-index: 20; }
.wordmark { display: flex; align-items: center; gap: 13px; flex-shrink: 0; }
.wordmark strong { position: relative; font-size: 37px; letter-spacing: -3px; line-height: 1; font-weight: 850; }
.brand-sun { position: absolute; top: -1px; right: -5px; width: 7px; height: 7px; border-radius: 50%; background: var(--accent); }
.wordmark > span { font-size: 15px; letter-spacing: -.5px; font-weight: 700; line-height: 1.4; }
.wordmark small { display: block; font-size: 8px; font-weight: 600; letter-spacing: 1.7px; margin-top: 3px; }
.navigation { display: flex; gap: 38px; margin-left: auto; font-size: 14px; font-weight: 500; }
.navigation a { position: relative; padding-block: 12px; }
.navigation a::after { content: ''; position: absolute; height: 1px; background: var(--accent); left: 0; right: 0; bottom: 6px; transform: scaleX(0); transform-origin: left; transition: transform .25s; }
.navigation a:hover::after { transform: scaleX(1); }
.header-actions { display: flex; align-items: center; gap: 24px; }
.theme-toggle { width: 32px; height: 36px; background: none; border: 0; font-size: 24px; padding: 0; }
.header-contact { border-bottom: 1px solid var(--ink); font-size: 14px; font-weight: 650; display: flex; align-items: center; gap: 20px; padding-block: 6px; white-space: nowrap; }
.header-contact span { font-size: 22px; font-weight: 400; }
.menu-toggle { display: none; border: 0; background: transparent; width: 32px; height: 40px; padding: 8px 3px; }
.menu-toggle span { display: block; height: 1.5px; background: var(--ink); width: 24px; margin-block: 7px; transition: transform .2s; }
.hero { display: grid; grid-template-columns: .86fr 1.14fr; align-items: center; min-height: min(830px, calc(100dvh - 82px)); padding-block: 52px 46px; position: relative; }
.hero-copy { padding-bottom: 14px; position: relative; z-index: 1; }
.eyebrow { font-size: 10px; font-weight: 700; letter-spacing: 2px; color: var(--accent); margin-bottom: 28px; }
h1 { font-size: clamp(40px, 4.05vw, 64px); line-height: 1.25; letter-spacing: -.065em; margin-left: -3px; white-space: nowrap; }
h1 span { font-weight: 400; }
.hero-description { color: var(--muted); line-height: 1.9; font-size: 16px; margin-top: 28px; letter-spacing: -.4px; }
.button { display: inline-flex; align-items: center; justify-content: space-between; gap: 36px; min-height: 54px; padding: 15px 24px; border: 1px solid transparent; border-radius: var(--radius); font-size: 14px; font-weight: 600; line-height: 1.4; white-space: nowrap; transition: transform .25s, box-shadow .25s; }
.button-primary { background: var(--accent); color: var(--on-accent); }
.button span { font-size: 22px; line-height: 1; font-weight: 400; transition: transform .25s; }
.button:hover { transform: translateY(-2px); box-shadow: var(--shadow); }
.button:hover span { transform: translate(3px,-3px); }
.hero .button { margin-top: 34px; }
.hero-visual { min-width: 0; margin-left: -10px; }
.scene-stage { height: clamp(370px, 35vw, 550px); position: relative; isolation: isolate; }
.scene-fallback { position: absolute; width: 100%; height: 100%; object-fit: cover; border-radius: var(--radius); opacity: 1; transition: opacity .5s; }
.scene-stage.ready .scene-fallback { opacity: 0; pointer-events: none; }
#solar-canvas { display: block; width: 100%; height: 100%; position: relative; opacity: 0; transition: opacity .6s; }
.scene-stage.ready #solar-canvas { opacity: 1; }
.scene-message { position: absolute; bottom: 12px; left: 12px; right: 12px; padding: 10px; font-size: 12px; color: var(--ink); background: var(--page); }
.scene-toolbar { display: flex; align-items: center; justify-content: space-between; gap: 12px; padding: 6px 0 15px 20px; border-bottom: 1px solid var(--line); }
.scene-caption { font-size: 11px; color: var(--muted); display: flex; align-items: center; gap: 10px; }
.tiny-line { width: 20px; height: 1px; background: var(--accent); }
.view-switch { display: flex; gap: 0; border: 1px solid var(--line); padding: 3px; border-radius: var(--radius); }
.view-switch button { background: transparent; border: 0; padding: 6px 9px; font-size: 10px; white-space: nowrap; border-radius: 2px; }
.view-switch button[aria-pressed="true"] { color: var(--page); background: var(--ink); }
.sun-control { display: flex; gap: 13px; align-items: center; padding: 17px 0 0 20px; font-size: 10px; color: var(--muted); }
.sun-control label { font-weight: 600; color: var(--ink); margin-right: auto; white-space: nowrap; }
.sun-control input { accent-color: var(--accent); height: 28px; width: 44%; margin: 0; cursor: pointer; }
.about { display: grid; grid-template-columns: .85fr 1.15fr; gap: 90px; align-items: center; border-top: 1px solid var(--line); }
.section-kicker { color: var(--accent); font-size: 12px; font-weight: 600; margin-bottom: 22px; display: block; }
h2 { font-size: clamp(30px, 3vw, 43px); line-height: 1.4; letter-spacing: -.055em; font-weight: 550; }
.about-intro p { margin-top: 26px; font-size: 15px; line-height: 2; color: var(--muted); }
.text-link { display: inline-flex; align-items: center; gap: 34px; font-size: 13px; font-weight: 650; border-bottom: 1px solid var(--line); padding: 9px 0; }
.text-link span { font-size: 22px; line-height: 1; transition: transform .25s; }
.text-link:hover span { transform: translate(3px,-3px); }
.about .text-link { margin-top: 30px; }
.landscape-image { overflow: hidden; aspect-ratio: 1.36; border-radius: var(--radius); }
.landscape img { width: 100%; height: 120%; object-fit: cover; transform: translateY(-8%); }
.landscape figcaption { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 8px; font-size: 10px; margin-top: 13px; color: var(--muted); }
.landscape figcaption span { opacity: .85; }
.business { padding-top: 46px; }
.section-heading { margin-bottom: 46px; }
.section-heading > p { color: var(--muted); margin-top: 24px; font-size: 15px; }
.business-grid { display: grid; grid-template-columns: 1.15fr .85fr; gap: 26px; }
.business-card { position: relative; border: 1px solid var(--line); border-radius: var(--radius); background: var(--surface-soft); min-height: 425px; overflow: hidden; }
.business-card-content { padding: 34px; position: relative; }
.business-en { font-size: 9px; letter-spacing: 1.6px; color: var(--muted); }
.business-card h3 { font-size: 27px; letter-spacing: -1px; margin-top: 9px; font-weight: 600; }
.business-card p { color: var(--muted); font-size: 14px; margin-top: 12px; line-height: 1.9; }
.business-card .text-link { margin-top: 23px; }
.design-card { display: grid; grid-template-columns: 1fr 1fr; align-items: center; }
.design-card .business-card-content { padding-left: 14px; padding-right: 24px; }
.panel-study { position: relative; height: 100%; min-height: 310px; overflow: hidden; background: var(--surface); }
.panel-array { display: grid; grid-template-columns: repeat(2, 65px); gap: 12px; position: absolute; top: 50%; left: 50%; transform: translate(-50%,-50%) rotateX(48deg) rotateZ(-29deg); transform-style: preserve-3d; }
.panel-array i { display: block; height: 90px; background: repeating-linear-gradient(0deg,transparent 0 14px,#94a6b62c 14px 15px),repeating-linear-gradient(90deg,#203c52 0 20px,#708a9e 20px 21px); border: 2px solid #8697a3; box-shadow: 2px 8px 0 #182c3b25,6px 13px 12px #172f431a; transition: transform .5s; }
.design-card:hover .panel-array i:nth-child(even) { transform: translateZ(6px); }
.diagram-axis { position: absolute; background: var(--muted); opacity: .22; }
.axis-x { height: 1px; width: 70%; left: 15%; bottom: 44px; }
.axis-y { width: 1px; height: 70%; top: 15%; left: 40px; }
.sales-card { display: flex; align-items: flex-end; }
.sales-card .business-card-content { width: 100%; }
.sales-visual { position: absolute; width: 195px; height: 195px; right: -32px; top: -6px; }
.orbit { position: absolute; inset: 0; border: 1px solid var(--line); border-radius: 50%; }
.orbit-two { inset: 26px; }
.orbit-center { position: absolute; width: 80px; height: 80px; left: 57px; top: 57px; border-radius: 50%; background: radial-gradient(circle at 35% 30%,#efc6a9,#ad491d); opacity: .75; }
.orbit-point { position: absolute; background: var(--accent); border-radius: 50%; width: 9px; height: 9px; left: 31px; top: 28px; }
.process { background: var(--surface-soft); margin-top: 8px; }
.process-track { position: relative; display: grid; grid-template-columns: repeat(3,1fr); gap: 50px; padding-top: 10px; }
.process-line { position: absolute; top: 15px; left: 0; right: 0; height: 1px; background: var(--line); }
.process-line span { display: block; height: 1px; background: var(--accent); transform: scaleX(0); transform-origin: left; }
.process-marker { display: block; width: 11px; height: 11px; border: 2px solid var(--accent); background: var(--surface-soft); border-radius: 50%; position: relative; margin-bottom: 30px; }
.process-item h3 { font-size: 21px; letter-spacing: -.7px; font-weight: 600; }
.process-item p { color: var(--muted); font-size: 14px; margin-top: 15px; line-height: 1.9; }
.contact { display: grid; grid-template-columns: 1fr 1.1fr; gap: 100px; align-items: start; }
.contact-intro > p { color: var(--muted); font-size: 15px; margin-top: 25px; }
.contact-brand { margin-top: 70px; font-size: 12px; font-weight: 700; letter-spacing: 1px; }
.contact-brand span { display: block; font-weight: 400; letter-spacing: 0; color: var(--muted); margin-top: 7px; }
.demo-notice { font-size: 11px; color: var(--muted); padding: 13px 15px; background: var(--surface); border-radius: var(--radius); margin-bottom: 26px; line-height: 1.8; }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 22px; }
.field { margin-bottom: 23px; }
.field label { display: block; font-size: 12px; font-weight: 600; margin-bottom: 9px; }
.field input,.field textarea,.field select { width: 100%; border: 1px solid var(--line); padding: 13px 14px; border-radius: var(--radius); background: var(--field); color: var(--ink); font-size: 13px; min-height: 48px; }
.field textarea { resize: vertical; min-height: 124px; }
.field input::placeholder,.field textarea::placeholder { color: var(--muted); opacity: 1; }
.field input:focus,.field textarea:focus,.field select:focus { border-color: var(--accent); }
.privacy { font-size: 11px; color: var(--muted); margin-top: -6px; margin-bottom: 15px; }
.privacy summary { padding-block: 7px; width: fit-content; }
.privacy p { padding: 12px; background: var(--surface-soft); line-height: 1.9; }
.consent { font-size: 12px; display: flex; align-items: flex-start; gap: 8px; cursor: pointer; }
.consent input { flex-shrink: 0; accent-color: var(--accent); width: 16px; height: 16px; margin: 3px 0 0; }
.submit-button { width: 100%; margin-top: 26px; }
.errorlist { padding: 0; margin: 6px 0 0; list-style: none; color: var(--accent); font-size: 12px; }
.form-success,.form-error-summary { border: 1px solid var(--accent); background: var(--surface-soft); padding: 15px; border-radius: var(--radius); font-size: 13px; margin-bottom: 24px; }
.footer { border-top: 1px solid var(--line); padding-block: 35px 28px; }
.footer-top { display: flex; gap: 30px; align-items: center; }
.footer-wordmark { font-size: 22px; letter-spacing: -1px; font-weight: 800; }
.footer-top > span { font-size: 12px; color: var(--muted); }
.back-top { font-size: 12px; margin-left: auto; display: flex; align-items: center; gap: 20px; }
.back-top span { font-size: 20px; }
.footer-bottom { display: flex; gap: 20px; justify-content: space-between; padding-top: 25px; color: var(--muted); }
.footer-bottom small { font-size: 10px; }
@media (min-width: 1600px) { .hero-visual { margin-left: 0; } }
@media (max-width: 1150px) {
  .section-width { width: calc(100% - 72px); }
  .header { padding-inline: 32px; gap: 22px; }
  .navigation { gap: 23px; font-size: 13px; }
  .hero { grid-template-columns: 1fr 1.05fr; }
  .scene-stage { height: 390px; }
  .scene-toolbar { flex-direction: column; align-items: flex-start; padding-left: 15px; }
  .sun-control { padding-left: 15px; }
  .sun-control input { width: 37%; }
  .about { gap: 50px; }
  .business-grid { grid-template-columns: 1fr 1fr; gap: 20px; }
  .design-card { grid-template-columns: 1fr; }
  .panel-study { min-height: 200px; }
  .panel-array { grid-template-columns: repeat(3,55px); gap: 10px; }
  .panel-array i { height: 75px; }
  .design-card .business-card-content { padding: 30px; }
  .contact { gap: 60px; }
}
@media (max-width: 767px) {
  html { scroll-padding-top: 86px; }
  .section-width { width: calc(100% - 40px); }
  .section-space { padding-block: 72px; }
  .header { height: 72px; padding-inline: 20px; gap: 12px; }
  .wordmark { gap: 9px; }
  .wordmark strong { font-size: 31px; }
  .wordmark > span { font-size: 12px; }
  .wordmark small { font-size: 6px; letter-spacing: 1px; }
  .header-actions { gap: 14px; }
  .theme-toggle { font-size: 22px; width: 24px; }
  .header-contact { font-size: 11px; gap: 8px; }
  .header-contact span { font-size: 18px; }
  .menu-toggle { display: block; }
  .navigation { display: none; position: absolute; inset: 72px 0 auto; padding: 24px; background: var(--page); border-bottom: 1px solid var(--line); flex-direction: column; gap: 12px; font-size: 16px; z-index: 30; }
  .navigation.open { display: flex; }
  .menu-toggle[aria-expanded="true"] span:first-child { transform: translateY(4.2px) rotate(45deg); }
  .menu-toggle[aria-expanded="true"] span:last-child { transform: translateY(-4.2px) rotate(-45deg); }
  .hero { grid-template-columns: 1fr; padding-block: 44px 35px; min-height: auto; gap: 12px; }
  .hero-copy { padding-bottom: 0; }
  .eyebrow { font-size: 9px; letter-spacing: 1.5px; margin-bottom: 20px; }
  h1 { font-size: clamp(31px,8.6vw,54px); line-height: 1.27; white-space: normal; }
  .hero-description { font-size: 14px; margin-top: 22px; }
  .hero .button { margin-top: 25px; }
  .button { min-height: 50px; padding: 14px 19px; font-size: 12px; }
  .hero-visual { margin: 0 -8px; }
  .scene-stage { height: 340px; }
  .scene-toolbar { flex-direction: row; align-items: center; padding: 0 8px 13px; gap: 5px; }
  .scene-caption { font-size: 9px; gap: 6px; }
  .tiny-line { width: 12px; }
  .view-switch button { padding: 5px 7px; font-size: 9px; }
  .sun-control { padding: 12px 8px 0; font-size: 9px; }
  .sun-control input { width: 42%; }
  .about { grid-template-columns: 1fr; gap: 38px; }
  h2 { font-size: clamp(28px,7.4vw,37px); }
  .section-kicker { margin-bottom: 17px; }
  .about-intro p { font-size: 14px; margin-top: 22px; }
  .about .text-link { margin-top: 22px; }
  .landscape-image { aspect-ratio: 1.4; }
  .landscape figcaption { font-size: 9px; }
  .business { padding-top: 10px; }
  .business-grid { grid-template-columns: 1fr; gap: 20px; }
  .section-heading { margin-bottom: 35px; }
  .business-card { min-height: 325px; }
  .design-card { display: grid; grid-template-columns: .8fr 1fr; }
  .panel-study { height: 100%; min-height: 325px; }
  .panel-array { grid-template-columns: repeat(2,48px); gap: 8px; }
  .panel-array i { height: 65px; }
  .design-card .business-card-content { padding: 25px 15px 25px 22px; }
  .business-card h3 { font-size: 22px; }
  .business-card p { font-size: 12px; }
  .business-card-content { padding: 28px; }
  .business-en { font-size: 7px; letter-spacing: 1px; }
  .business-card .text-link { font-size: 12px; gap: 20px; }
  .process-track { grid-template-columns: 1fr; gap: 32px; padding: 0 0 0 28px; }
  .process-line { top: 0; bottom: 0; width: 1px; height: auto; left: 5px; right: auto; }
  .process-line span { width: 1px; height: 100%; transform: none; background: var(--line); }
  .process-marker { position: absolute; left: -28px; top: 9px; margin: 0; }
  .process-item { position: relative; }
  .process-item h3 { font-size: 20px; }
  .process-item p { margin-top: 10px; font-size: 13px; }
  .contact { grid-template-columns: 1fr; gap: 35px; }
  .contact-brand { display: none; }
  .contact-intro > p { font-size: 14px; margin-top: 20px; }
  .form-row { gap: 16px; }
  .field input { font-size: 12px; padding-inline: 11px; }
  .footer-top { flex-wrap: wrap; gap: 13px; }
  .footer-wordmark { font-size: 20px; }
  .footer-top > span { font-size: 11px; }
  .footer-bottom { flex-direction: column; gap: 8px; padding-top: 20px; }
}
@media (max-width: 370px) {
  .wordmark > span { display: none; }
  .scene-caption .tiny-line { display: none; }
  .scene-caption { font-size: 8px; }
  .design-card { grid-template-columns: .7fr 1fr; }
  .form-row { grid-template-columns: 1fr; gap: 0; }
}
.company-contacts { display:flex; flex-wrap:wrap; gap:12px 24px; margin-top:22px; font-size:12px; color:var(--muted); }
.public-project-grid { display:grid; grid-template-columns:repeat(2,minmax(0,1fr)); gap:48px 30px; margin-bottom:35px; }
.public-project-card img { width:100%; aspect-ratio:1.6; object-fit:cover; border-radius:var(--radius); }
.project-card-meta { display:flex; justify-content:space-between; gap:15px; color:var(--muted); font-size:11px; margin-top:19px; }
.project-card-meta span:first-child { color:var(--accent); }
.public-project-card h3 { margin-top:10px; font-size:25px; font-weight:600; letter-spacing:-.8px; }
.public-project-card p { color:var(--muted); font-size:13px; margin-top:10px; line-height:1.9; }
.project-capacity { display:block; margin-top:16px; color:var(--muted); font-size:11px; }
.project-card-link { display:inline-block; font-size:12px; margin-top:18px; border-bottom:1px solid var(--line); padding-bottom:6px; }
.public-list-title { white-space:normal; font-size:clamp(32px,4vw,50px); }
.public-empty { color:var(--muted); margin-bottom:30px; line-height:2; }
.public-pagination { display:flex; gap:25px; justify-content:center; margin-top:50px; font-size:13px; }
.public-project-detail { max-width:1000px; margin:50px auto 0; }
.public-project-detail h1 { white-space:normal; font-size:clamp(32px,4vw,55px); }
.public-project-facts { display:flex; flex-wrap:wrap; gap:15px 30px; margin-top:25px; color:var(--muted); font-size:13px; }
.project-detail-photo { width:100%; height:auto; max-height:650px; object-fit:cover; margin-top:40px; border-radius:var(--radius); }
.project-summary { font-size:20px; margin-top:40px; }
.project-description { color:var(--muted); font-size:15px; line-height:2; margin-top:23px; }
.public-project-detail > .button { margin-top:40px; }
.selected-project { color:var(--accent); font-size:13px; margin-bottom:20px; }
@media(max-width:767px) { .public-project-grid { grid-template-columns:1fr; gap:35px; } .public-project-card h3 { font-size:23px; } .project-summary { font-size:18px; } }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *,*::before,*::after { animation: none !important; transition: none !important; }
  .process-line span { transform: none; }
}