/* base.css — 전 페이지 공통 토큰 및 구조. 색상/서체는 각 페이지 CSS에서 재정의한다. */

:root {
  --space-1: 4px;
  --space-2: 8px;
  --space-3: 16px;
  --space-4: 24px;
  --space-5: 32px;
  --space-6: 48px;
  --space-7: 64px;
  --space-8: 96px;

  --radius-sm: 4px;
  --radius-md: 10px;
  --radius-lg: 20px;

  --shadow-sm: 0 1px 3px rgba(20, 20, 15, 0.08);
  --shadow-md: 0 8px 28px rgba(20, 20, 15, 0.10);

  --container-max: 1120px;
  --header-h: 76px;

  --fs-sm: 0.875rem;
  --fs-base: 1rem;
  --fs-lg: 1.125rem;
  --fs-xl: 1.4rem;
  --fs-2xl: 1.9rem;
  --fs-3xl: 2.5rem;
  --fs-4xl: 3.2rem;

  /* 페이지별 CSS가 아래 값을 반드시 재정의한다 */
  --color-primary: #1F3A2E;
  --color-secondary: #8A9A5B;
  --color-accent: #B08D57;
  --color-bg: #FBFAF7;
  --color-surface: #FFFFFF;
  --color-text: #1F2421;
  --color-text-muted: #5B6259;
  --color-border: rgba(20, 20, 15, 0.12);
  --font-display: 'Marcellus', serif;
  --font-body: 'IBM Plex Sans KR', sans-serif;
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { animation-duration: 0.01ms !important; animation-iteration-count: 1 !important; transition-duration: 0.01ms !important; }
}

body {
  margin: 0;
  background: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-body);
  font-size: var(--fs-base);
  line-height: 1.8;
  word-break: keep-all;
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; height: auto; display: block; }
a { color: inherit; text-decoration: none; }
ul, ol { padding: 0; margin: 0; list-style: none; }
h1, h2, h3, h4, p, figure { margin: 0; }
table { border-collapse: collapse; width: 100%; }
button { font: inherit; cursor: pointer; }

h1, h2, h3, .font-display { font-family: var(--font-display); font-weight: 600; letter-spacing: -0.01em; }
h1 { font-size: var(--fs-4xl); line-height: 1.25; }
h2 { font-size: var(--fs-3xl); line-height: 1.3; }
h3 { font-size: var(--fs-xl); line-height: 1.4; }

:focus-visible {
  outline: 3px solid var(--color-accent);
  outline-offset: 3px;
}

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--color-primary);
  color: #fff;
  padding: var(--space-2) var(--space-3);
  z-index: 200;
}
.skip-link:focus { left: var(--space-2); top: var(--space-2); }

.visually-hidden {
  position: absolute;
  width: 1px; height: 1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
}

.container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--space-4);
}

.section {
  padding: var(--space-8) 0;
}
.section--tight { padding: var(--space-6) 0; }
.section-head { max-width: 640px; margin-bottom: var(--space-6); }
.section-head .eyebrow {
  display: inline-block;
  font-size: var(--fs-sm);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: var(--space-2);
}
.section-head p { color: var(--color-text-muted); margin-top: var(--space-3); }

/* ── 헤더 / 내비게이션 ───────────────────────── */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--header-h);
  display: flex;
  align-items: center;
  background: transparent;
  transition: background-color 0.25s ease, box-shadow 0.25s ease;
}
.site-header.is-scrolled {
  background: var(--color-surface);
  box-shadow: var(--shadow-sm);
}
.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
}
.wordmark {
  font-family: var(--font-display);
  font-size: var(--fs-lg);
  font-weight: 600;
  letter-spacing: 0.02em;
  color: var(--color-primary);
}
.wordmark span { color: var(--color-accent); }

.nav-list {
  display: flex;
  gap: var(--space-5);
  align-items: center;
}
.nav-list a {
  font-size: var(--fs-sm);
  padding: var(--space-1) 0;
  border-bottom: 2px solid transparent;
  transition: border-color 0.2s ease, color 0.2s ease;
}
.nav-list a:hover { color: var(--color-accent); }
.nav-list a[aria-current="page"] {
  border-color: var(--color-accent);
  color: var(--color-primary);
  font-weight: 600;
}

.nav-toggle {
  display: none;
  background: none;
  border: 0;
  padding: var(--space-2);
  min-width: 44px;
  min-height: 44px;
  align-items: center;
  justify-content: center;
}
.nav-toggle svg { width: 26px; height: 26px; }

.nav-overlay {
  position: fixed;
  inset: 0;
  z-index: 150;
  background: var(--color-primary);
  color: #fff;
  display: none;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--space-5);
}
.nav-overlay.is-open { display: flex; }
.nav-overlay a { font-family: var(--font-display); font-size: var(--fs-2xl); color: #fff; }
.nav-overlay .nav-toggle { position: absolute; top: var(--space-4); right: var(--space-4); color: #fff; display: flex; }

@media (max-width: 860px) {
  .nav-list { display: none; }
  .nav-toggle { display: flex; }
}

/* ── 히어로 ───────────────────────── */
.hero {
  padding: var(--space-8) 0 var(--space-6);
}
.hero__eyebrow {
  font-size: var(--fs-sm);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-accent);
}
.hero__sub {
  margin-top: var(--space-4);
  font-size: var(--fs-lg);
  color: var(--color-text-muted);
  max-width: 640px;
}
.hero__cta {
  display: flex;
  gap: var(--space-3);
  margin-top: var(--space-6);
  flex-wrap: wrap;
}

/* ── 버튼 ───────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  min-height: 48px;
  padding: 0 var(--space-5);
  border-radius: var(--radius-md);
  font-size: var(--fs-base);
  font-weight: 600;
}
.btn-primary { background: var(--color-primary); color: #fff; }
.btn-ghost { border: 1px solid var(--color-border); color: var(--color-text); }
.btn-block { width: 100%; justify-content: center; }

/* ── 모바일 고정 CTA 바 ───────────────────────── */
.mobile-cta-bar {
  position: fixed;
  left: 0; right: 0; bottom: 0;
  z-index: 120;
  display: none;
  height: 60px;
}
.mobile-cta-bar a {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 600;
  font-size: var(--fs-sm);
}
.mobile-cta-bar a:first-child { background: var(--color-primary); color: #fff; }
.mobile-cta-bar a:last-child { background: var(--color-accent); color: #fff; }
@media (max-width: 720px) {
  .mobile-cta-bar { display: flex; }
  body { padding-bottom: 60px; }
}

/* ── 카드 ───────────────────────── */
.card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-5);
}

/* ── 캐러셀 (공사범위 6카드) ───────────────────────── */
.carousel {
  display: grid;
  grid-auto-flow: column;
  grid-auto-columns: minmax(240px, 1fr);
  gap: var(--space-4);
  overflow-x: auto;
  padding-bottom: var(--space-3);
  scroll-snap-type: x proximity;
}
.carousel::-webkit-scrollbar { height: 6px; }
.carousel-card {
  scroll-snap-align: start;
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}
.carousel-card__title { font-family: var(--font-display); font-size: var(--fs-lg); }
.carousel-card__arrow { margin-top: auto; }
.carousel-card__arrow svg { width: 20px; height: 20px; transition: transform 0.2s ease; }
.carousel-card:hover .carousel-card__arrow svg { transform: translateX(4px); }

/* ── 체크리스트 ───────────────────────── */
.symptom-list { display: grid; gap: var(--space-3); }
.symptom-item {
  display: grid;
  grid-template-columns: 28px 1fr;
  gap: var(--space-3);
  padding: var(--space-4) 0;
  border-top: 1px solid var(--color-border);
}
.symptom-item svg { width: 22px; height: 22px; color: var(--color-accent); }
.symptom-item strong { display: block; font-family: var(--font-display); font-weight: 600; margin-bottom: var(--space-1); }
.symptom-item span { color: var(--color-text-muted); font-size: var(--fs-sm); }

/* ── 타임라인 ───────────────────────── */
.timeline { display: grid; gap: var(--space-5); counter-reset: step; }
.timeline-step { display: grid; grid-template-columns: 56px 1fr; gap: var(--space-4); }
.timeline-step__num {
  counter-increment: step;
  width: 44px; height: 44px;
  border-radius: 50%;
  border: 1px solid var(--color-accent);
  color: var(--color-accent);
  display: flex; align-items: center; justify-content: center;
  font-family: var(--font-display);
}
.timeline-step__num::before { content: counter(step); }
.timeline-step h3 { margin-bottom: var(--space-2); }
.timeline-step p { color: var(--color-text-muted); }

/* ── 표 ───────────────────────── */
.compare-table th, .compare-table td {
  text-align: left;
  padding: var(--space-3) var(--space-4);
  border-bottom: 1px solid var(--color-border);
  vertical-align: top;
}
.compare-table th { font-family: var(--font-display); color: var(--color-primary); }
.compare-table { overflow-x: auto; display: block; }

/* ── 전후 비교 슬라이더 ───────────────────────── */
.ba-slider {
  position: relative;
  width: 100%;
  aspect-ratio: 4 / 3;
  overflow: hidden;
  border-radius: var(--radius-md);
  background: var(--color-border);
  touch-action: none;
  user-select: none;
}
.ba-slider__img {
  position: absolute;
  inset: 0;
  width: 100%; height: 100%;
  object-fit: cover;
}
.ba-slider__after { clip-path: inset(0 50% 0 0); }
.ba-slider__label {
  position: absolute;
  top: var(--space-3);
  font-size: var(--fs-sm);
  letter-spacing: 0.14em;
  color: #fff;
  background: rgba(0, 0, 0, 0.45);
  padding: var(--space-1) var(--space-2);
  border-radius: var(--radius-sm);
}
.ba-slider__label--before { left: var(--space-3); }
.ba-slider__label--after { right: var(--space-3); }
.ba-slider__handle {
  position: absolute;
  top: 0; bottom: 0;
  left: 50%;
  width: 1px;
  background: #fff;
  transform: translateX(-50%);
}
.ba-slider__knob {
  position: absolute;
  top: 50%; left: 50%;
  width: 44px; height: 44px;
  border-radius: 50%;
  background: #fff;
  display: flex; align-items: center; justify-content: center;
  transform: translate(-50%, -50%);
  box-shadow: var(--shadow-md);
}
.ba-slider__knob svg { width: 18px; height: 18px; color: var(--color-primary); }
.ba-slider__caption { margin-top: var(--space-3); color: var(--color-text-muted); font-size: var(--fs-sm); }

/* JS 미동작 시 폴백: 좌우 나란히 표시 */
.no-js .ba-slider { aspect-ratio: auto; display: grid; grid-template-columns: 1fr 1fr; gap: var(--space-2); background: none; }
.no-js .ba-slider__img { position: static; width: 100%; aspect-ratio: 4/3; object-fit: cover; }
.no-js .ba-slider__after { clip-path: none; }
.no-js .ba-slider__handle, .no-js .ba-slider__knob { display: none; }

/* ── 아코디언 ───────────────────────── */
.accordion-item { border-top: 1px solid var(--color-border); }
.accordion-item:last-child { border-bottom: 1px solid var(--color-border); }
.accordion-trigger {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
  padding: var(--space-4) 0;
  background: none;
  border: 0;
  text-align: left;
  font-family: var(--font-display);
  font-size: var(--fs-lg);
  color: var(--color-text);
}
.accordion-trigger svg { width: 20px; height: 20px; flex-shrink: 0; transition: transform 0.2s ease; }
.accordion-trigger[aria-expanded="true"] svg { transform: rotate(45deg); }
.accordion-panel {
  overflow: hidden;
  max-height: 0;
  transition: max-height 0.25s ease;
}
.accordion-panel__inner { padding: 0 0 var(--space-4); color: var(--color-text-muted); }

/* ── CTA 블록 ───────────────────────── */
.cta-block {
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  background: var(--color-primary);
  color: #fff;
  text-align: center;
}
.cta-block h2 { color: #fff; }
.cta-block .hero__cta { justify-content: center; }
.cta-block .btn-primary { background: #fff; color: var(--color-primary); }
.cta-block .btn-ghost { border-color: rgba(255,255,255,0.5); color: #fff; }

/* ── 푸터 ───────────────────────── */
.site-footer {
  background: var(--color-primary);
  color: rgba(255,255,255,0.82);
  padding: var(--space-7) 0 var(--space-5);
  font-size: var(--fs-sm);
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1.4fr;
  gap: var(--space-5);
}
.footer-grid h3 { color: #fff; font-size: var(--fs-base); margin-bottom: var(--space-3); }
.footer-grid ul { display: grid; gap: var(--space-2); }
.footer-grid a:hover { color: #fff; }
.footer-brand { font-family: var(--font-display); color: #fff; font-size: var(--fs-lg); margin-bottom: var(--space-2); }
.footer-biz p { margin: 0 0 var(--space-1); }
.footer-bottom {
  margin-top: var(--space-6);
  padding-top: var(--space-4);
  border-top: 1px solid rgba(255,255,255,0.15);
  opacity: 0.7;
}
@media (max-width: 780px) {
  .footer-grid { grid-template-columns: 1fr 1fr; }
}

/* ── 사이트맵 트리 ───────────────────────── */
.tree { display: grid; gap: var(--space-2); }
.tree-node { display: flex; align-items: center; gap: var(--space-2); padding: var(--space-2) 0; }
.tree-node--child { margin-left: var(--space-6); position: relative; }
.tree-node--child::before {
  content: '';
  position: absolute;
  left: calc(var(--space-4) * -1);
  top: 50%;
  width: var(--space-3);
  height: 1px;
  background: var(--color-border);
}

/* ── 유틸 ───────────────────────── */
.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: var(--space-6); }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--space-5); }
@media (max-width: 860px) {
  .grid-2, .grid-3 { grid-template-columns: 1fr; }
  h1 { font-size: var(--fs-3xl); }
  h2 { font-size: var(--fs-2xl); }
}