/* =========================================================
   아르티엔테크 (ArtienTech) — styles.css
   1. 디자인 토큰   2. 리셋/기본   3. 공통 컴포넌트
   4. 헤더/내비     5. 히어로      6. 섹션별 스타일
   7. 작품 아트워크 8. 라이트박스  9. 반응형
   ========================================================= */

/* ---------- 1. 디자인 토큰 ---------- */
:root {
  /* 색상 — 라이트 */
  --bg:            #ffffff;
  --bg-alt:        #f5f5f8;
  --bg-elev:       #ffffff;
  --fg:            #15151d;
  --fg-muted:      #5c5c6b;
  --fg-faint:      #8b8b99;
  --border:        #e4e4ec;
  --border-strong: #cfcfda;
  --accent:        #5b3df5;
  --accent-fg:     #ffffff;
  --accent-soft:   rgba(91, 61, 245, 0.10);
  --accent-2:      #0ea5b7;
  --shadow-sm:     0 1px 2px rgba(20, 20, 35, 0.06), 0 2px 8px rgba(20, 20, 35, 0.05);
  --shadow-md:     0 8px 30px rgba(20, 20, 35, 0.10);
  --shadow-lg:     0 24px 70px rgba(20, 20, 35, 0.18);
  --header-bg:     rgba(255, 255, 255, 0.78);

  /* 간격 */
  --sp-1: 0.25rem;  --sp-2: 0.5rem;   --sp-3: 0.75rem;
  --sp-4: 1rem;     --sp-5: 1.5rem;   --sp-6: 2rem;
  --sp-7: 3rem;     --sp-8: 4rem;     --sp-9: 6rem;

  /* 형태 */
  --radius-sm: 8px;
  --radius:    14px;
  --radius-lg: 22px;
  --container: 1180px;
  --header-h:  70px;

  /* 모션 */
  --t-fast: 0.18s cubic-bezier(0.4, 0, 0.2, 1);
  --t:      0.32s cubic-bezier(0.4, 0, 0.2, 1);
  --t-slow: 0.7s  cubic-bezier(0.16, 1, 0.3, 1);

  /* 타이포 */
  --font: "Pretendard", "Pretendard Variable", -apple-system, BlinkMacSystemFont,
          "Segoe UI", "Malgun Gothic", "맑은 고딕", "Apple SD Gothic Neo",
          "Noto Sans KR", Roboto, sans-serif;
  --font-en: "Segoe UI", Inter, -apple-system, BlinkMacSystemFont, Helvetica, Arial, sans-serif;
}

/* 색상 — 다크 (OS 설정) */
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg:            #0b0b12;
    --bg-alt:        #101019;
    --bg-elev:       #16161f;
    --fg:            #f2f2f7;
    --fg-muted:      #a6a6b8;
    --fg-faint:      #71718a;
    --border:        #24242f;
    --border-strong: #34344a;
    --accent:        #8b6dff;
    --accent-fg:     #0b0b12;
    --accent-soft:   rgba(139, 109, 255, 0.14);
    --accent-2:      #22d3ee;
    --shadow-sm:     0 1px 2px rgba(0, 0, 0, 0.5);
    --shadow-md:     0 8px 30px rgba(0, 0, 0, 0.55);
    --shadow-lg:     0 24px 70px rgba(0, 0, 0, 0.7);
    --header-bg:     rgba(11, 11, 18, 0.74);
  }
}

/* 색상 — 다크 (토글 명시) */
:root[data-theme="dark"] {
  --bg:            #0b0b12;
  --bg-alt:        #101019;
  --bg-elev:       #16161f;
  --fg:            #f2f2f7;
  --fg-muted:      #a6a6b8;
  --fg-faint:      #71718a;
  --border:        #24242f;
  --border-strong: #34344a;
  --accent:        #8b6dff;
  --accent-fg:     #0b0b12;
  --accent-soft:   rgba(139, 109, 255, 0.14);
  --accent-2:      #22d3ee;
  --shadow-sm:     0 1px 2px rgba(0, 0, 0, 0.5);
  --shadow-md:     0 8px 30px rgba(0, 0, 0, 0.55);
  --shadow-lg:     0 24px 70px rgba(0, 0, 0, 0.7);
  --header-bg:     rgba(11, 11, 18, 0.74);
}

/* ---------- 2. 리셋 / 기본 ---------- */
*, *::before, *::after { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-h) + 12px);
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.7;
  letter-spacing: -0.01em;
  overflow-x: hidden;
  word-break: keep-all;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4 { margin: 0; line-height: 1.28; letter-spacing: -0.03em; font-weight: 700; }
p  { margin: 0; }
ul, ol, dl, dd { margin: 0; padding: 0; }
ul, ol { list-style: none; }
img, svg { max-width: 100%; }

a { color: inherit; text-decoration: none; }
button { font: inherit; color: inherit; cursor: pointer; }

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 4px;
}

.visually-hidden {
  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: absolute; top: -100px; left: var(--sp-4); z-index: 200;
  padding: var(--sp-3) var(--sp-5);
  background: var(--accent); color: var(--accent-fg);
  border-radius: var(--radius-sm); font-weight: 600;
  transition: top var(--t-fast);
}
.skip-link:focus { top: var(--sp-4); }

.container {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: clamp(1rem, 4vw, 2.5rem);
}

/* 스크롤 등장 애니메이션 */
.reveal {
  opacity: 0;
  transform: translateY(22px);
  transition: opacity var(--t-slow), transform var(--t-slow);
}
.reveal.is-visible { opacity: 1; transform: none; }

@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;
  }
  .reveal { opacity: 1; transform: none; }
}

/* ---------- 3. 공통 컴포넌트 ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: var(--sp-2);
  padding: 0.85rem 1.6rem;
  border: 1px solid transparent;
  border-radius: 999px;
  font-weight: 600; font-size: 0.97rem;
  transition: transform var(--t-fast), background var(--t-fast), border-color var(--t-fast), color var(--t-fast), box-shadow var(--t-fast);
  white-space: nowrap;
}
.btn:hover { transform: translateY(-2px); }
.btn--sm { padding: 0.6rem 1.2rem; font-size: 0.9rem; }

.btn--primary {
  background: var(--accent); color: var(--accent-fg);
  box-shadow: 0 8px 24px var(--accent-soft);
}
.btn--primary:hover { box-shadow: 0 12px 32px var(--accent-soft); }

.btn--ghost {
  background: transparent; color: var(--fg);
  border-color: var(--border-strong);
}
.btn--ghost:hover { border-color: var(--accent); color: var(--accent); }

.btn--outline {
  background: transparent; color: var(--fg);
  border-color: var(--border-strong);
  padding: 0.7rem 1.3rem; font-size: 0.92rem;
}
.btn--outline:hover { background: var(--accent); border-color: var(--accent); color: var(--accent-fg); }

.grad-text {
  background: linear-gradient(100deg, var(--accent), var(--accent-2));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.section { padding-block: clamp(3.5rem, 9vw, var(--sp-9)); }
.section--alt { background: var(--bg-alt); }

.section__head { max-width: 720px; margin-bottom: clamp(2rem, 5vw, var(--sp-7)); }
.section__eyebrow {
  font-family: var(--font-en);
  font-size: 0.78rem; font-weight: 700; letter-spacing: 0.18em;
  color: var(--accent); margin-bottom: var(--sp-3);
}
.section__title { font-size: clamp(1.75rem, 4.2vw, 2.7rem); }
.section__desc { margin-top: var(--sp-4); color: var(--fg-muted); font-size: 1.04rem; }

/* ---------- 4. 헤더 / 내비 ---------- */
.site-header {
  position: sticky; top: 0; z-index: 100;
  height: var(--header-h);
  transition: background var(--t), border-color var(--t), backdrop-filter var(--t);
  border-bottom: 1px solid transparent;
}
.site-header.is-stuck {
  background: var(--header-bg);
  backdrop-filter: saturate(180%) blur(14px);
  -webkit-backdrop-filter: saturate(180%) blur(14px);
  border-bottom-color: var(--border);
}

.header__inner {
  height: 100%;
  display: flex; align-items: center; justify-content: space-between; gap: var(--sp-4);
}

.brand { display: flex; align-items: center; gap: var(--sp-3); }
.brand__mark { width: 32px; height: 32px; display: block; flex: none; }
.brand__mark svg { width: 100%; height: 100%; display: block; }
.brand__text { display: flex; flex-direction: column; line-height: 1.1; }
.brand__text strong { font-size: 1.02rem; letter-spacing: -0.02em; }
.brand__text em {
  font-family: var(--font-en); font-style: normal;
  font-size: 0.62rem; letter-spacing: 0.24em; color: var(--fg-faint);
}

.nav__list { display: flex; align-items: center; gap: var(--sp-2); }
.nav__list a {
  display: block; padding: 0.5rem 0.85rem;
  border-radius: 999px;
  font-size: 0.94rem; font-weight: 500; color: var(--fg-muted);
  transition: color var(--t-fast), background var(--t-fast);
}
.nav__list a:hover { color: var(--fg); background: var(--accent-soft); }
.nav__list a.is-current { color: var(--accent); background: var(--accent-soft); font-weight: 600; }

.header__actions { display: flex; align-items: center; gap: var(--sp-2); }

.icon-btn {
  width: 40px; height: 40px; flex: none;
  display: grid; place-items: center;
  background: transparent; border: 1px solid var(--border);
  border-radius: 50%;
  transition: border-color var(--t-fast), background var(--t-fast);
}
.icon-btn:hover { border-color: var(--accent); background: var(--accent-soft); }
.icon-btn svg {
  width: 19px; height: 19px;
  fill: none; stroke: currentColor; stroke-width: 1.8;
  stroke-linecap: round; stroke-linejoin: round;
}
/* 기본(라이트) = 달 아이콘 노출 → 다크로 전환 유도 */
.icon-btn .icon-sun  { display: none; }
.icon-btn .icon-moon { display: block; }
:root[data-theme="dark"] .icon-btn .icon-sun  { display: block; }
:root[data-theme="dark"] .icon-btn .icon-moon { display: none; }
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .icon-btn .icon-sun  { display: block; }
  :root:not([data-theme="light"]) .icon-btn .icon-moon { display: none; }
}
/* 토글로 라이트를 명시한 경우가 항상 우선 (미디어쿼리보다 뒤에 선언) */
:root[data-theme="light"] .icon-btn .icon-sun  { display: none; }
:root[data-theme="light"] .icon-btn .icon-moon { display: block; }

.nav-toggle {
  display: none;
  width: 40px; height: 40px;
  background: transparent; border: 1px solid var(--border); border-radius: 50%;
  position: relative;
}
.nav-toggle__bar,
.nav-toggle__bar::before,
.nav-toggle__bar::after {
  position: absolute; left: 50%; width: 17px; height: 1.8px;
  background: currentColor; border-radius: 2px;
  transform: translateX(-50%);
  transition: transform var(--t-fast), opacity var(--t-fast);
}
.nav-toggle__bar { top: 50%; transform: translate(-50%, -50%); }
.nav-toggle__bar::before { content: ""; top: -6px; }
.nav-toggle__bar::after  { content: ""; top: 6px; }
.nav-toggle[aria-expanded="true"] .nav-toggle__bar { background: transparent; }
.nav-toggle[aria-expanded="true"] .nav-toggle__bar::before { top: 0; transform: translateX(-50%) rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle__bar::after  { top: 0; transform: translateX(-50%) rotate(-45deg); }

/* ---------- 5. 히어로 ---------- */
.hero {
  position: relative;
  padding-block: clamp(3.5rem, 11vw, 7.5rem) clamp(3rem, 8vw, 6rem);
  overflow: hidden;
}
.hero__bg {
  position: absolute; inset: -20% -10% auto -10%;
  height: 130%;
  background:
    radial-gradient(46% 46% at 18% 20%, var(--accent-soft), transparent 70%),
    radial-gradient(38% 38% at 82% 12%, rgba(14, 165, 183, 0.14), transparent 70%),
    radial-gradient(50% 40% at 60% 90%, var(--accent-soft), transparent 72%);
  filter: blur(6px);
  pointer-events: none;
}
.hero__inner { position: relative; }

.hero__eyebrow {
  font-family: var(--font-en);
  font-size: 0.8rem; font-weight: 700; letter-spacing: 0.22em;
  color: var(--fg-faint);
  margin-bottom: var(--sp-5);
}
.hero__title {
  font-size: clamp(2.4rem, 8.5vw, 5.2rem);
  letter-spacing: -0.045em;
  line-height: 1.08;
}
.hero__desc {
  margin-top: var(--sp-5);
  max-width: 44ch;
  font-size: clamp(1rem, 2.2vw, 1.18rem);
  color: var(--fg-muted);
}
.hero__cta { margin-top: var(--sp-6); display: flex; flex-wrap: wrap; gap: var(--sp-3); }
.hero__cta .reveal { transition-delay: 0.1s; }

.hero__marquee {
  margin-top: clamp(2.5rem, 7vw, 4.5rem);
  padding-top: var(--sp-5);
  border-top: 1px solid var(--border);
  display: flex; flex-wrap: wrap; gap: var(--sp-4);
  font-family: var(--font-en);
  font-size: 0.76rem; font-weight: 600; letter-spacing: 0.2em;
  color: var(--fg-faint);
}

/* ---------- 6. 섹션별 ---------- */

/* 사업 영역 */
.pillars { padding-top: 0; }
.pillars__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
  gap: var(--sp-4);
}
.pillar {
  display: flex; flex-direction: column; gap: var(--sp-2);
  padding: var(--sp-5);
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  transition: transform var(--t), border-color var(--t), box-shadow var(--t);
}
.pillar:hover {
  transform: translateY(-5px);
  border-color: var(--accent);
  box-shadow: var(--shadow-md);
}
.pillar__num {
  font-family: var(--font-en); font-size: 0.75rem; font-weight: 700;
  letter-spacing: 0.16em; color: var(--accent);
}
.pillar h3 { font-size: 1.2rem; }
.pillar p { color: var(--fg-muted); font-size: 0.93rem; }
.pillar__more {
  margin-top: auto; padding-top: var(--sp-3);
  font-size: 0.88rem; font-weight: 600; color: var(--accent);
}

/* 회사 소개 */
.about__grid {
  display: grid; grid-template-columns: 1fr 1fr;
  gap: clamp(1.5rem, 5vw, var(--sp-7));
  align-items: start;
}
.about__lead p { font-size: clamp(1rem, 2.1vw, 1.12rem); color: var(--fg-muted); }
.values { display: grid; gap: var(--sp-4); }
.value {
  padding-left: var(--sp-5);
  border-left: 2px solid var(--border-strong);
  transition: border-color var(--t);
}
.value:hover { border-left-color: var(--accent); }
.value h3 { font-size: 1.05rem; margin-bottom: var(--sp-1); }
.value p { color: var(--fg-muted); font-size: 0.93rem; }

.stats {
  margin-top: clamp(2.5rem, 6vw, var(--sp-8));
  display: grid; grid-template-columns: repeat(4, 1fr);
  gap: var(--sp-4);
  padding: var(--sp-6) var(--sp-5);
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
}
.stat { text-align: center; min-width: 0; }
.stat dt { font-size: 0.85rem; color: var(--fg-faint); margin-bottom: var(--sp-2); }
.stat dd {
  margin: 0;
  font-family: var(--font-en);
  font-size: clamp(1.5rem, 4vw, 2.3rem); font-weight: 700; letter-spacing: -0.03em;
  color: var(--fg);
}
.stat__suffix { font-size: 0.55em; color: var(--accent); margin-left: 2px; }

/* 작품 */
.filters { display: flex; flex-wrap: wrap; gap: var(--sp-2); margin-bottom: var(--sp-5); }
.filter {
  padding: 0.5rem 1.15rem;
  background: transparent;
  border: 1px solid var(--border-strong);
  border-radius: 999px;
  font-size: 0.9rem; font-weight: 500; color: var(--fg-muted);
  transition: all var(--t-fast);
}
.filter:hover { color: var(--fg); border-color: var(--accent); }
.filter.is-active { background: var(--accent); border-color: var(--accent); color: var(--accent-fg); font-weight: 600; }

.works {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
  gap: var(--sp-4);
}
.work { min-width: 0; }
.work[hidden] { display: none; }
.work__btn {
  display: block; width: 100%; padding: 0; text-align: left;
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: transform var(--t), border-color var(--t), box-shadow var(--t);
}
.work__btn:hover { transform: translateY(-6px); border-color: var(--accent); box-shadow: var(--shadow-md); }
.work__canvas {
  display: block; width: 100%; aspect-ratio: 4 / 3;
  transition: transform var(--t-slow);
}
.work__btn:hover .work__canvas { transform: scale(1.05); }
.work__meta { display: block; padding: var(--sp-4); }
.work__cat {
  display: block;
  font-size: 0.75rem; letter-spacing: 0.08em; color: var(--accent); font-weight: 600;
  margin-bottom: var(--sp-1);
}
.work__title { display: block; font-size: 1.1rem; font-weight: 700; }
.works__empty { margin-top: var(--sp-5); color: var(--fg-muted); }

/* 교육 */
.courses {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: var(--sp-4);
}
.course {
  display: flex; flex-direction: column; gap: var(--sp-3);
  padding: var(--sp-5);
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  transition: transform var(--t), border-color var(--t), box-shadow var(--t);
}
.course:hover { transform: translateY(-5px); border-color: var(--accent); box-shadow: var(--shadow-md); }
.course__tag {
  align-self: flex-start;
  padding: 0.25rem 0.7rem;
  background: var(--accent-soft); color: var(--accent);
  border-radius: 999px;
  font-size: 0.74rem; font-weight: 700; letter-spacing: 0.04em;
}
.course h3 { font-size: 1.18rem; }
.course > p { color: var(--fg-muted); font-size: 0.93rem; }
.course__spec { display: grid; gap: var(--sp-2); padding-top: var(--sp-3); border-top: 1px solid var(--border); }
.course__spec > div { display: flex; gap: var(--sp-3); font-size: 0.87rem; }
.course__spec dt { flex: none; width: 3.2rem; color: var(--fg-faint); }
.course__spec dd { margin: 0; color: var(--fg); }
.course__link { margin-top: auto; padding-top: var(--sp-2); font-size: 0.9rem; font-weight: 600; color: var(--accent); }
.course__link:hover { text-decoration: underline; }

.steps {
  margin-top: clamp(2rem, 5vw, var(--sp-7));
  display: grid; grid-template-columns: repeat(4, 1fr);
  gap: var(--sp-4);
  counter-reset: step;
}
.step { position: relative; padding-top: var(--sp-5); border-top: 2px solid var(--border); }
.step__num {
  position: absolute; top: -15px; left: 0;
  width: 28px; height: 28px;
  display: grid; place-items: center;
  background: var(--bg); border: 2px solid var(--accent); border-radius: 50%;
  font-family: var(--font-en); font-size: 0.78rem; font-weight: 700; color: var(--accent);
}
.section--alt .step__num { background: var(--bg-alt); }
.step h3 { font-size: 1rem; margin-bottom: var(--sp-1); }
.step p { font-size: 0.88rem; color: var(--fg-muted); }

/* SW 개발 */
.services {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--sp-4);
}
.service {
  padding: var(--sp-5);
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  transition: transform var(--t), border-color var(--t);
}
.service:hover { transform: translateY(-5px); border-color: var(--accent); }
.service__icon {
  display: grid; place-items: center;
  width: 44px; height: 44px; margin-bottom: var(--sp-4);
  background: var(--accent-soft); border-radius: 12px; color: var(--accent);
}
.service__icon svg {
  width: 22px; height: 22px;
  fill: none; stroke: currentColor; stroke-width: 1.7;
  stroke-linecap: round; stroke-linejoin: round;
}
.service h3 { font-size: 1.1rem; margin-bottom: var(--sp-2); }
.service p { font-size: 0.93rem; color: var(--fg-muted); }

.stack { margin-top: clamp(2rem, 5vw, var(--sp-7)); }
.stack__title { font-size: 0.8rem; letter-spacing: 0.16em; color: var(--fg-faint); margin-bottom: var(--sp-4); }
.stack__list { display: flex; flex-wrap: wrap; gap: var(--sp-2); }
.stack__list li {
  padding: 0.4rem 0.9rem;
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: 999px;
  font-family: var(--font-en); font-size: 0.85rem; color: var(--fg-muted);
  transition: border-color var(--t-fast), color var(--t-fast);
}
.stack__list li:hover { border-color: var(--accent); color: var(--accent); }

/* 스토어 */
.products {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(270px, 1fr));
  gap: var(--sp-4);
}
.product {
  display: flex; flex-direction: column;
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: transform var(--t), border-color var(--t), box-shadow var(--t);
}
.product:hover { transform: translateY(-5px); border-color: var(--accent); box-shadow: var(--shadow-md); }
.product__canvas { display: block; width: 100%; aspect-ratio: 16 / 10; }
.product__body { display: flex; flex-direction: column; gap: var(--sp-2); padding: var(--sp-5); flex: 1; }
.product__tag {
  align-self: flex-start;
  font-family: var(--font-en); font-size: 0.68rem; font-weight: 700; letter-spacing: 0.14em;
  color: var(--accent);
}
.product h3 { font-size: 1.12rem; }
.product__body > p { font-size: 0.91rem; color: var(--fg-muted); }
.product__body > p.product__price {
  margin-top: var(--sp-2);
  font-family: var(--font-en); font-size: 1.22rem; font-weight: 700; color: var(--fg);
}
.product__price span { font-size: 0.72em; font-weight: 500; margin-left: 2px; }
.product__price em {
  font-style: normal; font-family: var(--font);
  font-size: 0.62em; font-weight: 500; color: var(--fg-faint); margin-left: var(--sp-2);
}
.product .btn { margin-top: auto; align-self: flex-start; }

/* 문의 */
.contact__grid {
  display: grid; grid-template-columns: 1.35fr 1fr;
  gap: clamp(1.5rem, 4vw, var(--sp-7));
  align-items: start;
}
.form {
  display: grid; grid-template-columns: 1fr 1fr; gap: var(--sp-4);
  padding: clamp(1.25rem, 3vw, var(--sp-6));
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
}
.field { display: flex; flex-direction: column; gap: var(--sp-2); min-width: 0; }
.field--full { grid-column: 1 / -1; }
.field label { font-size: 0.88rem; font-weight: 600; }
.req { color: var(--accent); }
.field input, .field select, .field textarea {
  width: 100%;
  padding: 0.75rem 0.9rem;
  background: var(--bg);
  color: var(--fg);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-sm);
  font: inherit; font-size: 0.95rem;
  transition: border-color var(--t-fast), box-shadow var(--t-fast);
}
.field textarea { resize: vertical; min-height: 120px; }
.field input::placeholder, .field textarea::placeholder { color: var(--fg-faint); }
.field input:focus, .field select:focus, .field textarea:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-soft);
}
.field.has-error input, .field.has-error textarea { border-color: #e5484d; }
.field__error { font-size: 0.82rem; color: #e5484d; min-height: 0; }
.field__error:empty { display: none; }

.form__foot { flex-direction: row; align-items: center; flex-wrap: wrap; gap: var(--sp-4); }
.form__note { font-size: 0.85rem; color: var(--fg-faint); }
.form__note.is-ok { color: var(--accent); }

.contact__info {
  padding: clamp(1.25rem, 3vw, var(--sp-6));
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
}
.contact__info h3 { font-size: 1.15rem; margin-bottom: var(--sp-4); }
.contact__info dl { display: grid; gap: var(--sp-4); }
.contact__info dt { font-size: 0.78rem; letter-spacing: 0.08em; color: var(--fg-faint); margin-bottom: var(--sp-1); }
.contact__info dd { margin: 0; font-size: 0.95rem; }
.contact__info a:hover { color: var(--accent); text-decoration: underline; }
.map-placeholder {
  margin-top: var(--sp-5);
  display: grid; place-items: center;
  aspect-ratio: 16 / 10;
  background:
    linear-gradient(var(--border) 1px, transparent 1px) 0 0 / 26px 26px,
    linear-gradient(90deg, var(--border) 1px, transparent 1px) 0 0 / 26px 26px,
    var(--bg);
  border: 1px dashed var(--border-strong);
  border-radius: var(--radius);
  color: var(--fg-faint); font-size: 0.85rem; text-align: center;
}

/* 푸터 */
.site-footer {
  padding-block: var(--sp-7) var(--sp-6);
  border-top: 1px solid var(--border);
  background: var(--bg);
}
.footer__inner { display: grid; gap: var(--sp-5); }
.footer__brand strong { font-size: 1.05rem; }
.footer__brand strong span {
  font-family: var(--font-en); font-size: 0.62rem; font-weight: 600;
  letter-spacing: 0.22em; color: var(--fg-faint); margin-left: var(--sp-2);
}
.footer__brand p { color: var(--fg-muted); font-size: 0.92rem; margin-top: var(--sp-1); }
.footer__nav { display: flex; flex-wrap: wrap; gap: var(--sp-4); font-size: 0.9rem; color: var(--fg-muted); }
.footer__nav a:hover { color: var(--accent); }
.footer__copy {
  padding-top: var(--sp-5); border-top: 1px solid var(--border);
  font-family: var(--font-en); font-size: 0.8rem; color: var(--fg-faint);
}

/* ---------- 7. 작품 아트워크 (외부 이미지 없이 CSS로 생성) ---------- */
.art-1, .art-2, .art-3, .art-4,
.art-5, .art-6, .art-7, .art-8 {
  background-color: #10101a;
  background-repeat: no-repeat;
  background-size: cover;
}
/* 흐름의 기억 — 물결 */
.art-1 {
  background-image:
    repeating-linear-gradient(115deg, rgba(255,255,255,0.10) 0 2px, transparent 2px 16px),
    radial-gradient(70% 90% at 20% 100%, #22d3ee 0%, transparent 60%),
    linear-gradient(160deg, #1b1b3a 0%, #3b2a8c 55%, #0e7490 100%);
}
/* 빛의 문 — 수직 광원 */
.art-2 {
  background-image:
    linear-gradient(90deg, transparent 44%, rgba(255,255,255,0.85) 50%, transparent 56%),
    repeating-linear-gradient(90deg, rgba(255,255,255,0.06) 0 1px, transparent 1px 34px),
    radial-gradient(60% 70% at 50% 55%, #f9a8d4 0%, transparent 65%),
    linear-gradient(180deg, #191428 0%, #4c1d5e 100%);
}
/* 데이터 정원 — 점 격자 */
.art-3 {
  background-image:
    radial-gradient(circle, rgba(255,255,255,0.55) 1.2px, transparent 1.6px),
    radial-gradient(50% 60% at 75% 30%, #34d399 0%, transparent 62%),
    linear-gradient(200deg, #052e2b 0%, #134e4a 45%, #1e3a8a 100%);
  background-size: 18px 18px, cover, cover;
}
/* 잔향 — 동심원 */
.art-4 {
  background-image:
    repeating-radial-gradient(circle at 30% 70%, rgba(255,255,255,0.16) 0 1px, transparent 1px 20px),
    radial-gradient(60% 60% at 30% 70%, #fb923c 0%, transparent 60%),
    linear-gradient(140deg, #2b0f1e 0%, #7c2d12 60%, #1c1917 100%);
}
/* 파동의 방 — 링 */
.art-5 {
  background-image:
    repeating-radial-gradient(circle at 50% 50%, rgba(255,255,255,0.22) 0 1.5px, transparent 1.5px 26px),
    radial-gradient(45% 45% at 50% 50%, #a78bfa 0%, transparent 65%),
    linear-gradient(120deg, #0f0f23 0%, #312e81 100%);
}
/* 픽셀 산수 — 산 실루엣 */
.art-6 {
  background-image:
    linear-gradient(115deg, transparent 55%, rgba(255,255,255,0.10) 55% 60%, transparent 60%),
    linear-gradient(-115deg, transparent 50%, rgba(255,255,255,0.14) 50% 57%, transparent 57%),
    repeating-linear-gradient(0deg, rgba(0,0,0,0.18) 0 3px, transparent 3px 6px),
    linear-gradient(180deg, #f0abfc 0%, #7c3aed 40%, #0f172a 100%);
}
/* 무중력 정물 — 부유하는 형태 */
.art-7 {
  background-image:
    radial-gradient(16% 12% at 30% 35%, rgba(255,255,255,0.9) 0%, transparent 70%),
    radial-gradient(10% 8% at 68% 28%, rgba(255,255,255,0.7) 0%, transparent 70%),
    radial-gradient(22% 16% at 55% 72%, rgba(250,204,21,0.85) 0%, transparent 70%),
    linear-gradient(155deg, #0c4a6e 0%, #1e293b 55%, #020617 100%);
}
/* 숨 — 부드러운 호흡 */
.art-8 {
  background-image:
    radial-gradient(38% 38% at 50% 50%, rgba(255,255,255,0.30) 0%, transparent 70%),
    radial-gradient(70% 70% at 50% 50%, #f43f5e 0%, transparent 68%),
    linear-gradient(180deg, #18181b 0%, #4c0519 100%);
}

/* ---------- 8. 라이트박스 ---------- */
.lightbox {
  position: fixed; inset: 0; z-index: 200;
  display: grid; place-items: center;
  padding: var(--sp-4);
}
.lightbox[hidden] { display: none; }
.lightbox__backdrop {
  position: absolute; inset: 0;
  background: rgba(6, 6, 12, 0.72);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  animation: fade var(--t) both;
}
.lightbox__panel {
  position: relative;
  width: min(880px, 100%);
  max-height: 90vh; overflow-y: auto;
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  animation: pop var(--t) both;
}
@keyframes fade { from { opacity: 0; } to { opacity: 1; } }
@keyframes pop  { from { opacity: 0; transform: translateY(16px) scale(0.98); } to { opacity: 1; transform: none; } }

.lightbox__close {
  position: absolute; top: var(--sp-4); right: var(--sp-4); z-index: 2;
  width: 38px; height: 38px;
  display: grid; place-items: center;
  background: rgba(10, 10, 16, 0.55); color: #fff;
  border: none; border-radius: 50%;
  transition: background var(--t-fast);
}
.lightbox__close:hover { background: rgba(10, 10, 16, 0.85); }
.lightbox__close svg { width: 18px; height: 18px; fill: none; stroke: currentColor; stroke-width: 2; stroke-linecap: round; }

.lightbox__canvas {
  width: 100%; aspect-ratio: 16 / 9;
  border-radius: var(--radius-lg) var(--radius-lg) 0 0;
}
.lightbox__body { padding: clamp(1.25rem, 3vw, var(--sp-6)); display: grid; gap: var(--sp-3); justify-items: start; }
.lightbox__cat { font-size: 0.8rem; font-weight: 600; letter-spacing: 0.08em; color: var(--accent); }
.lightbox__title { font-size: clamp(1.4rem, 3.5vw, 2rem); }
.lightbox__desc { color: var(--fg-muted); }

/* ---------- 9. 반응형 ---------- */
@media (max-width: 1024px) {
  .stats { grid-template-columns: repeat(2, 1fr); gap: var(--sp-5); }
  .steps { grid-template-columns: repeat(2, 1fr); row-gap: var(--sp-6); }
}

@media (max-width: 860px) {
  .about__grid { grid-template-columns: 1fr; }
  .contact__grid { grid-template-columns: 1fr; }
}

@media (max-width: 768px) {
  :root { --header-h: 62px; }

  .nav-toggle { display: block; }

  .nav {
    position: fixed;
    inset: var(--header-h) 0 auto 0;
    background: var(--bg);
    border-bottom: 1px solid var(--border);
    box-shadow: var(--shadow-md);
    transform: translateY(-12px);
    opacity: 0;
    visibility: hidden;
    transition: opacity var(--t), transform var(--t), visibility var(--t);
    max-height: calc(100vh - var(--header-h));
    overflow-y: auto;
  }
  .nav.is-open { opacity: 1; visibility: visible; transform: none; }
  .nav__list { flex-direction: column; align-items: stretch; gap: 0; padding: var(--sp-3) clamp(1rem, 4vw, 2.5rem) var(--sp-5); }
  .nav__list a { padding: 0.85rem var(--sp-3); border-radius: var(--radius-sm); font-size: 1rem; }

  .site-header.is-stuck,
  .site-header:has(.nav.is-open) {
    background: var(--header-bg);
    backdrop-filter: saturate(180%) blur(14px);
    -webkit-backdrop-filter: saturate(180%) blur(14px);
    border-bottom-color: var(--border);
  }

  .form { grid-template-columns: 1fr; }
  .hero__cta .btn { flex: 1 1 auto; }
}

@media (max-width: 520px) {
  .stats { grid-template-columns: repeat(2, 1fr); padding: var(--sp-5) var(--sp-4); }
  .steps { grid-template-columns: 1fr; }
  .works { grid-template-columns: 1fr; }
  .brand__text em { display: none; }
}