/* =========================================================================
   [상호] 시공 홈페이지 — style.css
   구조: 1.토큰 2.베이스 3.레이아웃 4.컴포넌트 5.페이지별 6.유틸리티 7.미디어쿼리
   ========================================================================= */


/* =========================================================================
   1. 디자인 토큰
   ========================================================================= */
:root {
  /* --- 색상 : 베이스 --- */
  --color-ink:        #1C201F; /* 다크 섹션 배경 — 콘크리트 그림자 */
  --color-ink-2:       #262B29; /* 다크 섹션 내 카드/서브 배경 */
  --color-paper:       #F5F2EC; /* 라이트 섹션 배경 — 도면지 오프화이트 */
  --color-surface:     #FFFFFF; /* 순백이 필요한 좁은 영역 */

  /* --- 색상 : 텍스트(라이트 배경) --- */
  --color-text-1:      #161918;
  --color-text-2:      #545B58;
  --color-text-3:      #9AA19D;

  /* --- 색상 : 텍스트(다크 배경) --- */
  --color-text-inverse-1: #F5F2EC;
  --color-text-inverse-2: #B6BDB9;

  /* --- 색상 : 보더 --- */
  --color-border:      #E2DED3;
  --color-border-dark: #34413C;

  /* --- 색상 : 포인트(카퍼) --- */
  --color-accent:        #B5602E;
  --color-accent-strong: #8C4620;
  --color-accent-soft:   #F3E3D6;

  /* --- 폰트 패밀리 --- */
  --font-display: 'Big Shoulders Display', 'Gothic A1', sans-serif;
  --font-label:   'Big Shoulders Text', 'Gothic A1', sans-serif;
  --font-body:    'Gothic A1', -apple-system, BlinkMacSystemFont, 'Malgun Gothic', sans-serif;

  /* --- 타이포 스케일 (clamp, 6단계) --- */
  --fs-h1:      clamp(2.5rem, 1.7rem + 3.6vw, 4rem);      /* 40 → 64 */
  --fs-h2:      clamp(2rem, 1.55rem + 2vw, 3rem);          /* 32 → 48 */
  --fs-h3:      clamp(1.5rem, 1.3rem + 0.9vw, 2rem);       /* 24 → 32 */
  --fs-h4:      clamp(1.25rem, 1.12rem + 0.55vw, 1.5rem);  /* 20 → 24 */
  --fs-body-lg: clamp(1.05rem, 1rem + 0.2vw, 1.125rem);    /* 17 → 18 */
  --fs-body:    1rem;                                       /* 16 */
  --fs-label:   clamp(0.8125rem, 0.78rem + 0.15vw, 0.875rem); /* 13 → 14 */
  --fs-stat:    clamp(2.75rem, 2rem + 3vw, 4.5rem);

  /* --- 여백 스케일 --- */
  --space-3xs: 0.25rem;
  --space-2xs: 0.5rem;
  --space-xs:  0.75rem;
  --space-sm:  1rem;
  --space-md:  1.5rem;
  --space-lg:  2rem;
  --space-xl:  3rem;
  --space-2xl: 4rem;
  --space-3xl: 6rem;
  --space-4xl: 8rem;
  --section-pad-y: clamp(4rem, 3rem + 5vw, 8rem);

  /* --- 레이아웃 --- */
  --container-max: 87.5rem; /* 1400px */
  --container-w: 90%;
  --radius-sm: 2px;
  --radius-md: 4px;

  /* --- 이징 --- */
  --ease-out-slow:     cubic-bezier(0.16, 1, 0.3, 1);
  --ease-in-out-soft:  cubic-bezier(0.65, 0, 0.35, 1);
  --ease-out-standard: cubic-bezier(0.22, 1, 0.36, 1);

  /* --- 지속시간 --- */
  --dur-micro:   150ms;
  --dur-fast:    300ms;
  --dur-base:    500ms;
  --dur-reveal:  900ms;
  --dur-hero:    1100ms;
  --dur-media:   700ms;
  --dur-counter: 1600ms;

  /* --- 스태거 --- */
  --stagger-hero: 160ms;
  --stagger-card: 100ms;

  /* --- 그림자 --- */
  --shadow-btn-rest: 0 4px 14px rgba(23, 25, 24, 0.16);
  --shadow-btn-hover: 0 10px 28px rgba(23, 25, 24, 0.2);

  /* --- 고정 UI 높이 --- */
  --header-h: 4.5rem;
  --bottom-bar-h: 4rem;
}


/* =========================================================================
   2. 베이스
   ========================================================================= */
*, *::before, *::after { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
}

/* 모바일 메뉴·라이트박스가 열려 있을 때 배경 스크롤 잠금 */
html.nav-lock,
html.scroll-lock {
  overflow: hidden;
}

body {
  margin: 0;
  min-width: 0;
  overflow-x: hidden;
  background: var(--color-paper);
  color: var(--color-text-1);
  font-family: var(--font-body);
  font-size: var(--fs-body);
  line-height: 1.6;
  letter-spacing: 0;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  opacity: 0;
  transform: translateY(8px);
  transition: opacity var(--dur-base) var(--ease-out-standard),
              transform var(--dur-base) var(--ease-out-standard);
}
body.is-ready {
  opacity: 1;
  transform: none;
}
body.is-leaving {
  opacity: 0;
  transform: translateY(-8px);
  transition: opacity var(--dur-fast) var(--ease-out-standard),
              transform var(--dur-fast) var(--ease-out-standard);
}

h1, h2, h3, h4 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  letter-spacing: -0.01em;
  line-height: 1.12;
}

p { margin: 0; }

a {
  color: inherit;
  text-decoration: none;
}

img {
  max-width: 100%;
  display: block;
}

button {
  font: inherit;
  color: inherit;
  background: none;
  border: 0;
  cursor: pointer;
}

input, select, textarea {
  font: inherit;
  color: inherit;
}

ul, ol, dl, dd {
  margin: 0;
  padding: 0;
  list-style: none;
}

svg { display: block; }

/* 접근성: 포커스 링 */
:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 3px;
  border-radius: var(--radius-sm);
}

::selection {
  background: var(--color-accent-soft);
  color: var(--color-text-1);
}

/* 시각적으로 숨기되 스크린리더에는 노출 */
.visually-hidden {
  position: absolute;
  width: 1px; height: 1px;
  margin: -1px; padding: 0; border: 0;
  clip: rect(0 0 0 0);
  clip-path: inset(50%);
  overflow: hidden;
  white-space: nowrap;
}

.skip-link {
  position: absolute;
  top: var(--space-md);
  left: var(--space-md);
  z-index: 200;
  background: var(--color-ink);
  color: var(--color-text-inverse-1);
  padding: var(--space-2xs) var(--space-sm);
  border-radius: var(--radius-sm);
  transform: translateY(-200%);
  transition: transform var(--dur-fast) var(--ease-out-standard);
}
.skip-link:focus { transform: translateY(0); }


/* =========================================================================
   3. 레이아웃
   ========================================================================= */
.container {
  width: var(--container-w);
  max-width: var(--container-max);
  margin-inline: auto;
}

.section {
  padding-block: var(--section-pad-y);
}

.section--dark {
  background: var(--color-ink);
  color: var(--color-text-inverse-1);
}

.section--paper { background: var(--color-paper); }
.section--surface { background: var(--color-surface); }

.section-head {
  max-width: 40rem;
  margin-bottom: var(--space-2xl);
}
.section-head--center {
  margin-inline: auto;
  text-align: center;
}

.section-title {
  font-size: var(--fs-h2);
  margin-top: var(--space-2xs);
}


/* =========================================================================
   4. 컴포넌트
   ========================================================================= */

/* --- eyebrow 라벨 --- */
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2xs);
  font-family: var(--font-label);
  font-size: var(--fs-label);
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-accent);
}

/* --- 눈금자 구분선(ruler divider) --- */
.ruler-divider {
  height: 0.875rem;
  margin-top: var(--space-md);
  background-image:
    repeating-linear-gradient(to right, var(--color-border) 0 1px, transparent 1px 8px),
    repeating-linear-gradient(to right, var(--color-accent) 0 2px, transparent 2px 40px);
  background-position: left top, left bottom;
  background-repeat: repeat-x;
  background-size: 100% 0.375rem, 100% 100%;
}
.ruler-divider--inverse {
  background-image:
    repeating-linear-gradient(to right, var(--color-border-dark) 0 1px, transparent 1px 8px),
    repeating-linear-gradient(to right, var(--color-accent) 0 2px, transparent 2px 40px);
}

/* --- 공정 넘버링 라벨(도면 치수선) --- */
.tick-no {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2xs);
  margin-bottom: var(--space-sm);
}
.tick-no__label {
  font-family: var(--font-label);
  font-size: var(--fs-label);
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--color-accent);
}
.tick-no__ticks {
  display: inline-flex;
  align-items: center;
  gap: 0.1875rem;
}
.tick-no__ticks::before,
.tick-no__ticks::after,
.tick-no__ticks span {
  content: "";
  display: block;
  width: 0.5rem;
  height: 1px;
  background: var(--color-text-3);
}

/* --- 밑줄 스윕 링크(기본 숨김 → 호버 시 좌→우 드로잉) --- */
.link-sweep {
  position: relative;
  display: inline-block;
  font-family: var(--font-label);
  font-weight: 600;
  padding-bottom: 0.25em;
}
.link-sweep::after {
  content: "";
  position: absolute;
  left: 0; bottom: 0;
  width: 100%;
  height: 1px;
  background: var(--color-accent);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 450ms var(--ease-out-standard);
}
.link-sweep:hover::after,
.link-sweep:focus-visible::after {
  transform: scaleX(1);
}

/* --- 강조 단어 눈금 밑줄 드로잉(히어로) --- */
.tick-underline {
  position: relative;
  background: none;
  color: inherit;
  white-space: nowrap;
  padding: 0;
}
.tick-underline::after {
  content: "";
  position: absolute;
  left: 0.05em; right: 0.05em; bottom: -0.06em;
  height: 3px;
  background: var(--color-accent);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 350ms var(--ease-out-standard);
  transition-delay: 1500ms;
}
.hero.is-revealed .tick-underline::after {
  transform: scaleX(1);
}

/* --- 버튼 --- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2xs);
  min-height: 2.75rem;
  padding: 0.75rem 1.75rem;
  border-radius: var(--radius-md);
  font-family: var(--font-label);
  font-size: var(--fs-body);
  font-weight: 600;
  letter-spacing: 0.01em;
  border: 1px solid transparent;
  transition: transform var(--dur-fast) var(--ease-out-standard),
              box-shadow var(--dur-fast) var(--ease-out-standard),
              background-color var(--dur-fast) var(--ease-out-standard),
              border-color var(--dur-fast) var(--ease-out-standard),
              color var(--dur-fast) var(--ease-out-standard);
}

.btn--accent {
  background: var(--color-accent);
  color: var(--color-text-inverse-1);
  box-shadow: var(--shadow-btn-rest);
}
.btn--accent:hover, .btn--accent:focus-visible {
  background: var(--color-accent-strong);
  box-shadow: var(--shadow-btn-hover);
  transform: translateY(-3px);
}

.btn--outline {
  background: transparent;
  color: var(--color-text-1);
  border-color: var(--color-border);
}
.btn--outline:hover, .btn--outline:focus-visible {
  border-color: var(--color-accent);
  color: var(--color-accent);
  transform: translateY(-2px);
}

.btn--ghost-inverse {
  background: transparent;
  color: var(--color-text-inverse-1);
  border-color: rgba(245, 242, 236, 0.4);
}
.btn--ghost-inverse:hover, .btn--ghost-inverse:focus-visible {
  border-color: var(--color-text-inverse-1);
  transform: translateY(-2px);
}

/* --- 도면 눈금 시스템: 미디어 프레임(코너 틱마크) --- */
.media-frame {
  position: relative;
  display: block;
  aspect-ratio: var(--frame-ratio, 5 / 4);
}
.media-frame__img {
  position: absolute;
  inset: 0;
  overflow: hidden;
  display: block;
}
.media-frame__img img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--dur-media) var(--ease-in-out-soft);
}
.media-frame__tick {
  position: absolute;
  width: 0.875rem;
  height: 0.875rem;
  z-index: 2;
  transition: transform var(--dur-fast) var(--ease-out-standard),
              border-color var(--dur-fast) var(--ease-out-standard);
}
.media-frame__tick--tl {
  top: 0.625rem; left: 0.625rem;
  border-top: 1px solid var(--color-text-3);
  border-left: 1px solid var(--color-text-3);
}
.media-frame__tick--br {
  bottom: 0.625rem; right: 0.625rem;
  border-bottom: 1px solid var(--color-text-3);
  border-right: 1px solid var(--color-text-3);
}
.media-frame:hover .media-frame__img img,
.media-frame:focus-visible .media-frame__img img {
  transform: scale(1.06);
}
.media-frame:hover .media-frame__tick--tl,
.media-frame:focus-visible .media-frame__tick--tl {
  border-color: var(--color-accent);
  transform: translate(-3px, -3px);
}
.media-frame:hover .media-frame__tick--br,
.media-frame:focus-visible .media-frame__tick--br {
  border-color: var(--color-accent);
  transform: translate(3px, 3px);
}

/* --- 헤더 --- */
.site-header {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  color: var(--color-text-inverse-1);
  background: transparent;
  border-bottom: 1px solid transparent;
  transition: transform var(--dur-base) var(--ease-out-standard),
              background-color var(--dur-base) var(--ease-out-standard),
              color var(--dur-fast) var(--ease-out-standard),
              border-color var(--dur-base) var(--ease-out-standard);
}
.site-header.is-scrolled {
  background: rgba(245, 242, 236, 0.86);
  -webkit-backdrop-filter: blur(8px);
  backdrop-filter: blur(8px);
  color: var(--color-text-1);
  border-bottom-color: var(--color-border);
}
.site-header.is-hidden {
  transform: translateY(-100%);
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--header-h);
}

.site-header__logo {
  display: flex;
  flex-direction: column;
  line-height: 1.15;
}
.site-header__logo-main {
  font-family: var(--font-display);
  font-size: 1.375rem;
  font-weight: 700;
  letter-spacing: -0.01em;
}
.site-header__logo-sub {
  font-family: var(--font-label);
  font-size: 0.625rem;
  letter-spacing: 0.16em;
  opacity: 0.7;
}

.site-header__nav {
  display: none;
  align-items: center;
  gap: var(--space-xl);
}
.site-header__link {
  font-family: var(--font-label);
  font-weight: 600;
  font-size: 0.9375rem;
}
.site-header__link--cta {
  color: var(--color-accent);
}

.site-header__burger {
  position: relative;
  width: 2.75rem;
  height: 2.75rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}
.site-header__burger span {
  position: absolute;
  width: 1.375rem;
  height: 1px;
  background: currentColor;
  transition: transform var(--dur-fast) var(--ease-out-standard),
              opacity var(--dur-fast) var(--ease-out-standard);
}
.site-header__burger span:nth-child(1) { transform: translateY(-0.3125rem); }
.site-header__burger span:nth-child(3) { transform: translateY(0.3125rem); }
.site-header__burger[aria-expanded="true"] span:nth-child(1) { transform: translateY(0) rotate(45deg); }
.site-header__burger[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.site-header__burger[aria-expanded="true"] span:nth-child(3) { transform: translateY(0) rotate(-45deg); }

.mobile-nav {
  position: fixed;
  inset: 0;
  z-index: 99;
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: var(--space-2xl);
  padding: var(--space-2xl) var(--space-lg);
  background: var(--color-ink);
  color: var(--color-text-inverse-1);
  visibility: hidden;
  opacity: 0;
  transition: opacity var(--dur-base) var(--ease-out-standard), visibility var(--dur-base);
}
.mobile-nav.is-open {
  visibility: visible;
  opacity: 1;
}
.mobile-nav nav {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}
.mobile-nav__link {
  font-family: var(--font-display);
  font-size: clamp(2rem, 1.6rem + 3vw, 3rem);
  font-weight: 700;
  opacity: 0;
  transform: translateY(1rem);
  transition: opacity var(--dur-base) var(--ease-out-slow), transform var(--dur-base) var(--ease-out-slow);
  transition-delay: calc(var(--i, 0) * 70ms);
}
.mobile-nav.is-open .mobile-nav__link {
  opacity: 1;
  transform: none;
}
.mobile-nav__contact {
  padding-top: var(--space-lg);
  border-top: 1px solid var(--color-border-dark);
}
.mobile-nav__tel {
  font-family: var(--font-label);
  font-size: var(--fs-h4);
  color: var(--color-accent);
}

/* --- 모바일 하단 고정 3버튼 바 --- */
.bottom-bar {
  position: fixed;
  left: 0; right: 0; bottom: 0;
  z-index: 90;
  display: flex;
  background: var(--color-surface);
  border-top: 1px solid var(--color-border);
  padding-bottom: env(safe-area-inset-bottom, 0);
  box-shadow: 0 -4px 20px rgba(23, 25, 24, 0.08);
}
.bottom-bar__btn {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.25rem;
  min-height: 3.75rem;
  font-family: var(--font-label);
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--color-text-2);
  border-right: 1px solid var(--color-border);
}
.bottom-bar__btn:last-child { border-right: 0; }
.bottom-bar__btn svg { width: 1.25rem; height: 1.25rem; }
.bottom-bar__btn--accent {
  color: var(--color-accent);
}

/* --- 데스크톱 플로팅 CTA --- */
.floating-cta {
  position: fixed;
  right: var(--space-xl);
  bottom: var(--space-xl);
  z-index: 90;
  display: none;
  align-items: center;
  gap: var(--space-sm);
}
.floating-cta__top {
  width: 2.75rem;
  height: 2.75rem;
  border-radius: 50%;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-btn-rest);
  opacity: 0;
  transform: translateY(0.5rem);
  pointer-events: none;
  transition: opacity var(--dur-fast) var(--ease-out-standard),
              transform var(--dur-fast) var(--ease-out-standard);
}
.floating-cta__top.is-visible {
  opacity: 1;
  transform: none;
  pointer-events: auto;
}
.floating-cta__top svg { width: 1.125rem; height: 1.125rem; }
.floating-cta__pill {
  display: flex;
  align-items: center;
  height: 3.25rem;
  padding-inline: 1.75rem;
  border-radius: 999px;
  background: var(--color-ink);
  color: var(--color-text-inverse-1);
  font-family: var(--font-label);
  font-weight: 600;
  box-shadow: var(--shadow-btn-rest);
  transition: transform var(--dur-fast) var(--ease-out-standard),
              box-shadow var(--dur-fast) var(--ease-out-standard),
              background-color var(--dur-fast) var(--ease-out-standard);
}
.floating-cta__pill::before {
  content: "";
  width: 0.5rem; height: 0.5rem;
  margin-right: 0.625rem;
  background: var(--color-accent);
  border-radius: 50%;
}
.floating-cta__pill:hover, .floating-cta__pill:focus-visible {
  background: var(--color-accent);
  transform: translateY(-3px);
  box-shadow: var(--shadow-btn-hover);
}

/* --- 푸터 --- */
.site-footer {
  background: var(--color-ink);
  color: var(--color-text-inverse-2);
  padding-block: var(--space-2xl) var(--space-xl);
}
.site-footer__inner {
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
}
.site-footer__name {
  font-family: var(--font-display);
  font-size: var(--fs-h4);
  color: var(--color-text-inverse-1);
  margin-right: var(--space-sm);
}
.site-footer__ceo { font-size: 0.9375rem; }
.site-footer__meta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2xs) var(--space-lg);
  font-size: 0.875rem;
  padding-top: var(--space-md);
  border-top: 1px solid var(--color-border-dark);
}
.site-footer__copy {
  font-size: 0.8125rem;
  color: var(--color-text-3);
}

/* --- reveal 공통 유틸 --- */
.reveal {
  opacity: 0;
  transform: translateY(2rem);
  transition: opacity var(--dur-reveal) var(--ease-out-slow),
              transform var(--dur-reveal) var(--ease-out-slow);
  transition-delay: var(--reveal-delay, 0ms);
}
.reveal.is-visible {
  opacity: 1;
  transform: none;
}

/* --- 스크롤 유도 인디케이터 --- */
.scroll-cue {
  position: absolute;
  left: 50%;
  bottom: var(--space-xl);
  transform: translateX(-50%);
  width: 1px;
  height: 3.5rem;
  overflow: hidden;
}
.scroll-cue span {
  display: block;
  width: 100%;
  height: 100%;
  background: rgba(245, 242, 236, 0.4);
  transform: scaleY(0.4) translateY(-100%);
  transform-origin: top;
  animation: scroll-cue-move 2.2s var(--ease-in-out-soft) infinite;
}
@keyframes scroll-cue-move {
  0% { transform: scaleY(0.4) translateY(-100%); }
  50% { transform: scaleY(0.4) translateY(150%); }
  100% { transform: scaleY(0.4) translateY(150%); }
}

/* --- 폼 요소 --- */
.form-field {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  margin-bottom: var(--space-lg);
}
.form-field label {
  font-family: var(--font-label);
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--color-text-2);
}
.form-field .req { color: var(--color-accent); }
.form-field input,
.form-field select,
.form-field textarea {
  min-height: 2.75rem;
  padding: 0.625rem 0.875rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-surface);
  color: var(--color-text-1);
  transition: border-color var(--dur-fast) var(--ease-out-standard);
}
.form-field textarea { min-height: 6.5rem; resize: vertical; }
.form-field input:focus,
.form-field select:focus,
.form-field textarea:focus {
  border-color: var(--color-accent);
  outline: none;
}
.form-field.has-error input,
.form-field.has-error select {
  border-color: #b23a2e;
}
.form-error {
  min-height: 1.1em;
  font-size: 0.8125rem;
  color: #b23a2e;
}
.form-field--checkbox { gap: 0.375rem; }
.checkbox {
  display: flex;
  align-items: flex-start;
  gap: 0.625rem;
  font-family: var(--font-body);
  font-weight: 400;
  font-size: 0.9375rem;
  color: var(--color-text-1);
  cursor: pointer;
}
.checkbox input {
  width: 1.25rem;
  height: 1.25rem;
  min-height: 0;
  flex-shrink: 0;
  accent-color: var(--color-accent);
  margin-top: 0.125rem;
}
.form-detail-toggle {
  align-self: flex-start;
  font-family: var(--font-label);
  font-size: 0.8125rem;
  text-decoration: underline;
  color: var(--color-text-2);
  min-height: 2rem;
}
.form-detail {
  padding: var(--space-sm);
  background: var(--color-paper);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  font-size: 0.8125rem;
  line-height: 1.7;
  color: var(--color-text-2);
  opacity: 0;
  transform: translateY(-0.5rem);
  transition: opacity var(--dur-fast) var(--ease-out-standard), transform var(--dur-fast) var(--ease-out-standard);
}
.form-detail.is-open {
  opacity: 1;
  transform: none;
}
.contact-form__submit { width: 100%; margin-top: var(--space-sm); }
.contact-form__done {
  text-align: center;
  padding: var(--space-2xl) var(--space-lg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
}
.contact-form__done-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 3rem; height: 3rem;
  margin-bottom: var(--space-md);
  border-radius: 50%;
  background: var(--color-accent-soft);
  color: var(--color-accent-strong);
  font-size: 1.25rem;
}
.contact-form__done h3 {
  font-size: var(--fs-h4);
  margin-bottom: var(--space-2xs);
}
.contact-form__done p { color: var(--color-text-2); }

/* --- 아코디언 --- */
.accordion-item {
  border-bottom: 1px solid var(--color-border);
}
.accordion-item__trigger {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-md);
  padding-block: var(--space-md);
  text-align: left;
  font-family: var(--font-label);
  font-size: var(--fs-body-lg);
  font-weight: 600;
  min-height: 2.75rem;
}
.accordion-item__icon {
  position: relative;
  flex-shrink: 0;
  width: 1rem; height: 1rem;
}
.accordion-item__icon::before,
.accordion-item__icon::after {
  content: "";
  position: absolute;
  top: 50%; left: 50%;
  background: var(--color-accent);
  transition: transform var(--dur-fast) var(--ease-out-standard);
}
.accordion-item__icon::before { width: 1rem; height: 1px; transform: translate(-50%, -50%); }
.accordion-item__icon::after { width: 1px; height: 1rem; transform: translate(-50%, -50%); }
.accordion-item__trigger[aria-expanded="true"] .accordion-item__icon::after {
  transform: translate(-50%, -50%) scaleY(0);
}
.accordion-item__panel {
  padding-bottom: var(--space-md);
  color: var(--color-text-2);
  line-height: 1.75;
  opacity: 0;
  transform: translateY(-0.5rem);
  transition: opacity var(--dur-fast) var(--ease-out-standard), transform var(--dur-fast) var(--ease-out-standard);
}
.accordion-item__panel.is-open {
  opacity: 1;
  transform: none;
}

/* --- 라이트박스 --- */
.lightbox {
  position: fixed;
  inset: 0;
  z-index: 200;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-md);
  visibility: hidden;
  opacity: 0;
  transition: opacity var(--dur-fast) var(--ease-out-standard), visibility var(--dur-fast);
}
.lightbox.is-open {
  visibility: visible;
  opacity: 1;
}
.lightbox__backdrop {
  position: absolute;
  inset: 0;
  background: rgba(20, 22, 21, 0.9);
}
.lightbox__panel {
  position: relative;
  z-index: 1;
  width: 100%;
  max-width: 62.5rem;
  max-height: 90vh;
  overflow-y: auto;
  background: var(--color-surface);
  border-radius: var(--radius-md);
  display: grid;
  transform: scale(0.96);
  transition: transform var(--dur-fast) var(--ease-out-standard);
}
.lightbox.is-open .lightbox__panel { transform: scale(1); }
.lightbox__media { margin: 0; aspect-ratio: 5 / 4; }
.lightbox__media img { width: 100%; height: 100%; object-fit: cover; }
.lightbox__info { padding: var(--space-lg); }
.lightbox__type {
  font-family: var(--font-label);
  font-size: var(--fs-label);
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-accent);
}
.lightbox__title {
  font-size: var(--fs-h3);
  margin-top: var(--space-2xs);
  margin-bottom: var(--space-md);
}
.lightbox__detail {
  display: grid;
  gap: var(--space-sm);
}
.lightbox__detail div {
  display: flex;
  justify-content: space-between;
  gap: var(--space-md);
  padding-block: var(--space-xs);
  border-top: 1px solid var(--color-border);
  font-size: 0.9375rem;
}
.lightbox__detail dt { color: var(--color-text-3); }
.lightbox__detail dd { text-align: right; color: var(--color-text-1); }
.lightbox__close {
  position: absolute;
  top: var(--space-sm); right: var(--space-sm);
  z-index: 2;
  width: 2.75rem; height: 2.75rem;
  display: flex; align-items: center; justify-content: center;
  font-size: 1.5rem;
  color: var(--color-text-1);
  background: var(--color-surface);
  border-radius: 50%;
  box-shadow: var(--shadow-btn-rest);
}
.lightbox__nav {
  position: absolute;
  top: 50%;
  z-index: 2;
  width: 2.75rem; height: 2.75rem;
  display: none;
  align-items: center; justify-content: center;
  font-size: 1.75rem;
  background: var(--color-surface);
  border-radius: 50%;
  box-shadow: var(--shadow-btn-rest);
  transform: translateY(-50%);
}
.lightbox__nav--prev { left: -1.375rem; }
.lightbox__nav--next { right: -1.375rem; }


/* =========================================================================
   5. 페이지별
   ========================================================================= */

/* --- 히어로(index) --- */
.hero {
  position: relative;
  min-height: 100svh;
  display: flex;
  align-items: flex-end;
  overflow: hidden;
  background: var(--color-ink);
  color: var(--color-text-inverse-1);
}
.hero__media {
  position: absolute;
  inset: 0;
  z-index: 0;
}
.hero__media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.hero__overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(28, 32, 31, 0.25) 0%, rgba(20, 23, 22, 0.55) 55%, rgba(15, 17, 16, 0.85) 100%);
}
.hero__content {
  position: relative;
  z-index: 1;
  padding-bottom: var(--space-4xl);
  max-width: 42rem;
}
.hero__headline {
  margin-top: var(--space-md);
  font-size: var(--fs-h1);
  overflow: hidden;
}
.hero__line {
  display: block;
  opacity: 0;
  transform: translateY(2rem);
  transition: opacity var(--dur-hero) var(--ease-out-slow), transform var(--dur-hero) var(--ease-out-slow);
  transition-delay: calc(var(--i, 0) * var(--stagger-hero));
}
.hero.is-revealed .hero__line,
.hero.is-revealed .eyebrow.reveal-line,
.hero.is-revealed .hero__sub,
.hero.is-revealed .hero__content .btn {
  opacity: 1;
  transform: none;
}
.eyebrow.reveal-line,
.hero__sub,
.hero__content .btn {
  opacity: 0;
  transform: translateY(1.25rem);
  transition: opacity var(--dur-hero) var(--ease-out-slow), transform var(--dur-hero) var(--ease-out-slow);
  transition-delay: calc(var(--i, 0) * var(--stagger-hero));
}
.hero__sub {
  margin-top: var(--space-md);
  font-size: var(--fs-body-lg);
  color: var(--color-text-inverse-2);
  max-width: 30rem;
}
.hero__content .btn {
  margin-top: var(--space-xl);
}

/* --- 서브 히어로(portfolio/about/contact) --- */
.sub-hero {
  position: relative;
  min-height: 22rem;
  display: flex;
  align-items: flex-end;
  overflow: hidden;
  background: var(--color-ink);
  color: var(--color-text-inverse-1);
}
.sub-hero__media {
  position: absolute;
  inset: 0;
}
.sub-hero__media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.55;
}
.sub-hero__overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(20, 23, 22, 0.35) 0%, rgba(15, 17, 16, 0.8) 100%);
}
.sub-hero__content {
  position: relative;
  z-index: 1;
  padding-block: var(--space-3xl) var(--space-xl);
}
.sub-hero__title {
  margin-top: var(--space-2xs);
  font-size: var(--fs-h1);
}

/* --- 대표 시공 사례(index) --- */
.works-preview__grid {
  display: grid;
  gap: var(--space-lg);
}
.work-card__media { --frame-ratio: 5 / 4; }
.work-card__link { display: block; }
.work-card__link:hover .media-frame__img img,
.work-card__link:focus-visible .media-frame__img img { transform: scale(1.06); }
.work-card__link:hover .media-frame__tick--tl,
.work-card__link:focus-visible .media-frame__tick--tl {
  border-color: var(--color-accent);
  transform: translate(-3px, -3px);
}
.work-card__link:hover .media-frame__tick--br,
.work-card__link:focus-visible .media-frame__tick--br {
  border-color: var(--color-accent);
  transform: translate(3px, 3px);
}
.work-card__caption {
  display: flex;
  flex-direction: column;
  gap: 0.375rem;
  margin-top: var(--space-sm);
  transform: translateY(0);
}
.work-card__type {
  font-family: var(--font-label);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-accent);
}
.work-card__title {
  font-family: var(--font-display);
  font-size: var(--fs-h4);
  font-weight: 700;
}
.work-card__meta {
  font-size: 0.875rem;
  color: var(--color-text-2);
}
.works-preview__more {
  display: block;
  width: fit-content;
  margin-top: var(--space-2xl);
  margin-inline: auto;
}

/* --- 강점(concerns, dark) --- */
.concerns__grid {
  display: grid;
  gap: var(--space-2xl);
}
.concern-card__title {
  font-size: var(--fs-h4);
  margin-bottom: var(--space-sm);
}
.concern-card__body {
  color: var(--color-text-inverse-2);
  line-height: 1.8;
}
.concerns .tick-no__label { color: var(--color-accent); }
.concerns .tick-no__ticks span,
.concerns .tick-no__ticks::before,
.concerns .tick-no__ticks::after {
  background: var(--color-border-dark);
}

/* --- 시공 과정(process) --- */
.process-timeline {
  display: grid;
  gap: var(--space-2xl) var(--space-lg);
}
.process-step__title { font-size: var(--fs-h4); margin-bottom: var(--space-xs); }
.process-step__desc { color: var(--color-text-2); line-height: 1.75; }

/* --- 실적 카운터(stats) --- */
.stats { padding-block: var(--space-2xl); border-block: 1px solid var(--color-border); }
.stats__grid {
  display: grid;
  gap: var(--space-lg);
  text-align: center;
}
.stat__value {
  font-family: var(--font-display);
  font-size: var(--fs-stat);
  font-weight: 700;
  color: var(--color-text-1);
  display: inline-flex;
  align-items: baseline;
  gap: 0.125rem;
}
.stat__unit { font-size: 0.55em; font-family: var(--font-label); }
.stat__label {
  margin-top: var(--space-2xs);
  font-family: var(--font-label);
  font-size: 0.875rem;
  letter-spacing: 0.08em;
  color: var(--color-text-2);
}

/* --- 상담 CTA(consult-cta, dark) --- */
.consult-cta__inner { text-align: center; max-width: 46rem; margin-inline: auto; }
.consult-cta__title {
  font-size: var(--fs-h2);
  line-height: 1.3;
}
.consult-cta__actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: var(--space-md);
  margin-top: var(--space-2xl);
}

/* --- 포트폴리오 필터 --- */
.filter-bar {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
  margin-bottom: var(--space-2xl);
}
.filter-bar__btn {
  min-height: 2.75rem;
  padding: 0.5rem 1.25rem;
  border: 1px solid var(--color-border);
  border-radius: 999px;
  font-family: var(--font-label);
  font-weight: 600;
  font-size: 0.9375rem;
  color: var(--color-text-2);
  transition: background-color var(--dur-fast) var(--ease-out-standard),
              color var(--dur-fast) var(--ease-out-standard),
              border-color var(--dur-fast) var(--ease-out-standard);
}
.filter-bar__btn.is-active {
  background: var(--color-ink);
  border-color: var(--color-ink);
  color: var(--color-text-inverse-1);
}

.works-grid {
  display: grid;
  gap: var(--space-lg);
  transition: opacity var(--dur-fast) var(--ease-out-standard);
}
.works-grid.is-filtering { opacity: 0; }
.works-grid .work-card { display: none; }
.works-grid .work-card.is-shown { display: block; }
.works-more {
  display: block;
  margin: var(--space-2xl) auto 0;
}

/* --- about: 대표 인사말 --- */
.ceo-greeting__grid {
  display: grid;
  gap: var(--space-2xl);
  align-items: center;
}
.ceo-greeting__media { --frame-ratio: 3 / 4; max-width: 24rem; }
.ceo-greeting__text p + p { margin-top: var(--space-md); }
.ceo-greeting__lead { font-size: var(--fs-body-lg); font-weight: 600; }
.ceo-greeting__sign { margin-top: var(--space-lg); font-family: var(--font-label); color: var(--color-text-2); }

/* --- about: 원칙 카드 --- */
.principles__grid {
  display: grid;
  gap: var(--space-lg);
}
.principle-card {
  padding: var(--space-lg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
}
.principle-card__title { font-size: var(--fs-h4); margin-bottom: var(--space-sm); }
.principle-card__body { color: var(--color-text-2); line-height: 1.75; }

/* --- about: 오시는길 --- */
.location__grid {
  display: grid;
  gap: var(--space-2xl);
  align-items: center;
}
.location__map { --frame-ratio: 16 / 9; }
.location__detail {
  margin-top: var(--space-lg);
  display: grid;
  gap: var(--space-sm);
}
.location__detail div {
  display: flex;
  gap: var(--space-md);
  padding-block: var(--space-sm);
  border-top: 1px solid var(--color-border);
}
.location__detail dt { flex: 0 0 6rem; color: var(--color-text-3); font-size: 0.875rem; }
.location__detail dd { color: var(--color-text-1); }

/* --- contact --- */
.contact-grid {
  display: grid;
  gap: var(--space-3xl);
}
.contact-info__desc { margin-top: var(--space-sm); color: var(--color-text-2); }
.contact-info__actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
  margin-top: var(--space-lg);
}
.contact-info__detail {
  margin-top: var(--space-2xl);
  display: grid;
  gap: var(--space-sm);
}
.contact-info__detail div {
  display: flex;
  gap: var(--space-md);
  padding-block: var(--space-sm);
  border-top: 1px solid var(--color-border);
}
.contact-info__detail dt { flex: 0 0 7rem; color: var(--color-text-3); font-size: 0.875rem; }


/* =========================================================================
   6. 유틸리티
   ========================================================================= */
.mt-0 { margin-top: 0; }
.text-center { text-align: center; }


/* =========================================================================
   7. 미디어쿼리
   ========================================================================= */

/* --- ≥768px --- */
@media (min-width: 48em) {
  .works-preview__grid { grid-template-columns: repeat(2, 1fr); }
  .concerns__grid { grid-template-columns: repeat(3, 1fr); }
  .process-timeline { grid-template-columns: repeat(3, 1fr); }
  .stats__grid { grid-template-columns: repeat(3, 1fr); }
  .works-grid { grid-template-columns: repeat(2, 1fr); }
  .ceo-greeting__grid { grid-template-columns: 0.85fr 1fr; }
  .location__grid { grid-template-columns: 1fr 1fr; }
  .principles__grid { grid-template-columns: repeat(3, 1fr); }
  .contact-grid { grid-template-columns: 1fr 1.1fr; }
  .lightbox__panel { grid-template-columns: 1.1fr 1fr; max-height: 80vh; }
  .lightbox__media { aspect-ratio: auto; height: 100%; }
  .lightbox__nav { display: flex; }
}

/* --- ≥900px: 헤더/하단바/플로팅CTA 전환 --- */
@media (min-width: 56.25em) {
  .site-header__nav { display: flex; }
  .site-header__burger { display: none; }
  .mobile-nav { display: none; }
  .bottom-bar { display: none; }
  .floating-cta { display: flex; }
  body { padding-bottom: 0; }
}
@media (max-width: 56.19em) {
  body { padding-bottom: calc(var(--bottom-bar-h) + env(safe-area-inset-bottom, 0px)); }
}

/* --- ≥1200px --- */
@media (min-width: 75em) {
  .works-preview__grid {
    grid-template-columns: 1.3fr 1fr;
    grid-template-rows: repeat(2, 1fr);
  }
  .work-card--lg { grid-row: 1 / 3; }
  .work-card--lg .work-card__link { display: flex; flex-direction: column; height: 100%; }
  .work-card--lg .media-frame { flex: 1 1 auto; min-height: 0; aspect-ratio: auto; }
  .works-grid { grid-template-columns: repeat(3, 1fr); }
  .concerns__grid { gap: var(--space-3xl); }
  :root { --header-h: 5rem; }
}


/* =========================================================================
   접근성: 모션 축소
   ========================================================================= */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }
  body { opacity: 1; transform: none; }
  .reveal,
  .hero__line, .eyebrow.reveal-line, .hero__sub, .hero__content .btn,
  .mobile-nav__link, .tick-underline::after {
    opacity: 1;
    transform: none;
  }
  .tick-underline::after { transform: scaleX(1); }
  .scroll-cue span { animation: none; transform: scaleY(0.4); }
}