/* ===== Reset & base ===== */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: 'Pretendard', -apple-system, BlinkMacSystemFont, 'Malgun Gothic', sans-serif;
  font-weight: 500;
  color: var(--color-text-main);
  background: var(--color-bg-main);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  word-break: keep-all;
  overflow-wrap: break-word;
}
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
ul { margin: 0; padding: 0; list-style: none; }
h1, h2, h3, p { margin: 0; }
h1, h2, h3 { font-weight: 800; }
button { font: inherit; }
table { border-collapse: collapse; width: 100%; }

:root {
  --color-bg-main: #F5FAF9;
  --color-bg-soft: #EAF3F1;
  --color-bg-panel: #FFFFFF;
  --color-bg-air: #DDEDEA;
  --color-text-main: #1F2B2A;
  --color-text-sub: #5D6C69;
  --color-primary: #3E817B;
  --color-primary-dark: #24534F;
  --color-accent: #8BC6BD;
  --color-accent-soft: #D4EFEB;
  --color-warning: #B86B58;
  --color-line: #C8D8D5;
  --color-white: #FFFFFF;
  --radius: 18px;
}

.wrap { max-width: 1160px; margin: 0 auto; padding: 0 24px; }
section { padding: 72px 0; }
section.tight { padding: 44px 0; }
.section-alt { background: var(--color-bg-soft); }
.section-head { max-width: 640px; margin: 0 0 40px; }
.section-head h2 { font-size: clamp(1.4rem, 3vw, 2rem); font-weight: 700; letter-spacing: -0.01em; }
.section-head p { margin-top: 10px; color: var(--color-text-sub); font-size: 1rem; }
.eyebrow {
  display: inline-block; font-size: 0.82rem; font-weight: 700; letter-spacing: 0.04em;
  color: var(--color-primary-dark); background: var(--color-accent-soft);
  padding: 6px 14px; border-radius: 999px; margin-bottom: 14px;
}

/* ===== Header ===== */
.site-header {
  position: sticky; top: 0; z-index: 40; background: rgba(245,250,249,.4); border-bottom: 1px solid transparent;
  box-shadow: none; transition: background-color .25s ease, box-shadow .25s ease, border-color .25s ease;
}
.site-header.is-scrolled {
  background: rgba(255,255,255,.92); backdrop-filter: blur(8px); -webkit-backdrop-filter: blur(8px);
  border-bottom-color: var(--color-line); box-shadow: 0 4px 18px rgba(31,43,42,.08);
}
.site-header-inner { display: flex; align-items: center; gap: 20px; height: 68px; }
.logo { font-weight: 800; font-size: 1.05rem; color: var(--color-primary-dark); display: flex; align-items: center; gap: 8px; }
.logo span { font-weight: 600; font-size: 0.8rem; color: var(--color-text-sub); }
.site-nav { display: flex; gap: 22px; flex: 1; overflow-x: auto; justify-content: flex-end; }
.site-nav a { font-size: 0.94rem; font-weight: 700; color: var(--color-text-main); white-space: nowrap; }
.site-nav a:hover { color: var(--color-primary-dark); }
.nav-toggle { display: none; background: none; border: none; padding: 8px; }
.nav-toggle span { display: block; width: 20px; height: 2px; background: var(--color-text-main); margin: 4px 0; }

.btn-call {
  display: inline-flex; align-items: center; gap: 8px; background: var(--color-primary); color: var(--color-white);
  font-weight: 700; padding: 11px 22px; border-radius: 999px; font-size: 0.95rem; white-space: nowrap;
  transition: background .15s;
}
.btn-call:hover { background: var(--color-primary-dark); }

/* ===== Hero (diagnosis split) ===== */
.diag-hero { padding: 56px 0 64px; }
.diag-hero-inner { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; }

/* Left half: one big enlarged photo, full column height — the dominant visual now that copy moved to the right. */
.diag-hero-photo-text { position: relative; border-radius: var(--radius); overflow: hidden; height: 600px; }
.diag-hero-bgphoto { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; }

/* Right half: "교체 후" photo on top, keyword/copy panel below it (not overlaid — legibility over style) */
.diag-hero-photos { display: flex; flex-direction: column; gap: 12px; height: 600px; }
.diag-hero-photos figure { margin: 0; position: relative; border-radius: var(--radius); overflow: hidden; background: var(--color-bg-panel); height: 260px; flex: none; }
.diag-hero-photos img { width: 100%; height: 100%; object-fit: cover; }
.diag-hero-photos figcaption {
  position: absolute; left: 10px; bottom: 10px; background: rgba(31,43,42,.72); color: #fff;
  font-size: 0.75rem; font-weight: 700; padding: 4px 10px; border-radius: 999px;
}
.diag-hero-copy {
  flex: 1; display: flex; flex-direction: column; justify-content: center;
  background: var(--color-bg-panel); border-radius: var(--radius); padding: 22px 24px;
  border-top: 4px solid var(--color-primary); box-shadow: 0 10px 28px rgba(31,43,42,.06);
}
.diag-hero-copy h1 { font-size: clamp(1.7rem, 3.2vw, 2.2rem); font-weight: 900; letter-spacing: -0.02em; color: var(--color-text-main); }
.diag-hero-copy .lede { margin-top: 10px; font-size: 0.95rem; line-height: 1.55; color: var(--color-text-sub); }
.diag-hero-copy .cta-row { margin-top: 14px; display: flex; gap: 12px; flex-wrap: wrap; }
.diag-labels { margin-top: 10px; display: flex; flex-wrap: wrap; gap: 8px; }
.diag-labels span {
  background: var(--color-white); border: 1px solid var(--color-line); color: var(--color-primary-dark);
  font-size: 0.8rem; font-weight: 700; padding: 5px 11px; border-radius: 999px;
}

/* ===== Symptom checkboard ===== */
.check-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; }
.check-card {
  background: var(--color-bg-panel); border: 1px solid var(--color-line); border-radius: var(--radius);
  padding: 20px; display: flex; flex-direction: column; gap: 10px;
}
.check-card .tag {
  align-self: flex-start; font-size: 0.72rem; font-weight: 700; color: var(--color-primary-dark);
  background: var(--color-accent-soft); padding: 3px 10px; border-radius: 999px;
}
.check-card p { font-size: 0.98rem; font-weight: 600; color: var(--color-text-main); }

/* ===== Repair vs Replace compare ===== */
.compare-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
.compare-col { background: var(--color-bg-panel); border-radius: var(--radius); padding: 28px; border: 1px solid var(--color-line); }
.compare-col.replace { border-color: var(--color-accent); background: var(--color-bg-air); }
.compare-col h3 { font-size: 1.15rem; font-weight: 700; margin-bottom: 14px; }
.compare-col ul li {
  padding: 10px 0; border-top: 1px dashed var(--color-line); font-size: 0.95rem; color: var(--color-text-sub);
}
.compare-col ul li:first-child { border-top: none; }
.compare-note { margin-top: 16px; font-size: 0.85rem; color: var(--color-text-sub); }

/* ===== Before/After scroll-crossfade ===== */
.cf-showcase { background: var(--color-bg-air); }
.cf-stack { display: grid; gap: 28px; }
.cf-stack-2 { grid-template-columns: 1fr 1fr; margin-top: 24px; }
.cf-lead { margin-top: 28px; color: var(--color-text-sub); font-size: 0.92rem; }
.replace-case-list { display: grid; gap: 10px; margin-top: 20px; }
.replace-case-list li { border-top: 1px dashed var(--color-line); padding: 12px 0; }
.replace-case-list li:first-child { border-top: none; }
.replace-case-list a { font-size: 0.98rem; font-weight: 600; color: var(--color-text-main); }
.replace-case-list a:hover { color: var(--color-primary-dark); }
.cf-box {
  position: relative; max-width: 420px; width: 100%; height: 420px; margin: 32px auto; border-radius: var(--radius);
  overflow: hidden; background: var(--color-bg-soft); border: 1px solid var(--color-line);
}
.cf-stack .cf-box { margin: 0 auto; }
.cf-img { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; background: var(--color-bg-soft); }
.cf-before { opacity: 1; transition: opacity 1s ease; }
.cf-after { opacity: 0; transition: opacity 1s ease; }
.cf-box.show-after .cf-before { opacity: 0; }
.cf-box.show-after .cf-after { opacity: 1; }
.cf-title {
  position: absolute; z-index: 2; top: 12px; right: 12px; background: var(--color-white); color: var(--color-primary-dark);
  font-weight: 700; font-size: 0.82rem; padding: 5px 13px; border-radius: 999px;
}
.cf-badge {
  position: absolute; z-index: 2; top: 12px; left: 12px; background: rgba(31,43,42,.78); color: #fff;
  font-weight: 700; font-size: 0.78rem; padding: 5px 13px; border-radius: 999px; letter-spacing: .03em;
}

/* ===== Detail-page before/after — side by side so both photos are clearly visible at once ===== */
.pair-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; max-width: 640px; margin: 32px auto; }
.pair-box {
  position: relative; height: 320px; border-radius: var(--radius); overflow: hidden;
  background: var(--color-bg-soft); border: 1px solid var(--color-line);
}
.pair-box img { width: 100%; height: 100%; object-fit: cover; background: var(--color-bg-soft); }
.pair-tag {
  position: absolute; z-index: 2; top: 10px; left: 10px; background: rgba(31,43,42,.78); color: #fff;
  font-weight: 700; font-size: 0.75rem; padding: 4px 10px; border-radius: 999px; letter-spacing: .03em;
}
.pair-tag.after { left: auto; right: 10px; background: var(--color-primary); }

/* ===== Prose / table ===== */
.prose { max-width: 760px; margin: 32px auto; }
.prose h2 { font-size: 1.35rem; font-weight: 700; margin: 32px 0 14px; }
.prose h3 { font-size: 1.05rem; font-weight: 700; margin: 24px 0 10px; }
.prose p { color: var(--color-text-sub); font-size: 1rem; margin-bottom: 12px; }
.prose ul li { position: relative; padding: 6px 0 6px 18px; color: var(--color-text-sub); }
.prose ul li::before { content: ''; position: absolute; left: 2px; top: 15px; width: 6px; height: 6px; border-radius: 50%; background: var(--color-accent); }
.data-table { margin: 20px 0; border-radius: var(--radius); overflow: hidden; border: 1px solid var(--color-line); }
.data-table table { background: var(--color-bg-panel); }
.data-table th, .data-table td { padding: 12px 16px; text-align: left; font-size: 0.92rem; border-bottom: 1px solid var(--color-line); }
.data-table th { background: var(--color-bg-soft); color: var(--color-primary-dark); font-weight: 700; }
.data-table tr:last-child td { border-bottom: none; }

/* ===== Space guide / NSEO cards ===== */
.space-guide-list { display: grid; grid-template-columns: repeat(5, 1fr); gap: 10px; }
.space-guide-list li {
  background: var(--color-bg-panel); border: 1px solid var(--color-line); border-radius: 12px;
  padding: 14px; text-align: center; font-size: 0.88rem; font-weight: 600; color: var(--color-text-sub);
}
.nseo-cards { display: grid; grid-template-columns: repeat(5, 1fr); gap: 16px; }
.nseo-card { background: var(--color-bg-panel); border-radius: var(--radius); overflow: hidden; border: 1px solid var(--color-line); display: block; }
.nseo-card img { width: 100%; aspect-ratio: 4/5; object-fit: cover; }
.nseo-card .nseo-card-label { padding: 12px; font-weight: 700; font-size: 0.92rem; text-align: center; }

/* ===== FAQ ===== */
.faq-list { display: grid; gap: 10px; }
.faq-item { background: var(--color-bg-panel); border: 1px solid var(--color-line); border-radius: 14px; padding: 18px 20px; }
.faq-item summary { cursor: pointer; font-weight: 700; font-size: 1rem; }
.faq-a { margin-top: 10px; color: var(--color-text-sub); font-size: 0.94rem; }

/* ===== Related links — 4x1 photo cards ===== */
.related-block { margin: 40px 0; }
.related-cards { display: grid; grid-template-columns: repeat(4, 1fr); gap: 14px; margin-top: 16px; }
.related-card { background: var(--color-bg-panel); border-radius: var(--radius); overflow: hidden; border: 1px solid var(--color-line); display: block; }
.related-card img { width: 100%; aspect-ratio: 4/3; object-fit: cover; }
.related-card-label { display: block; padding: 10px 12px; font-weight: 700; font-size: 0.88rem; text-align: center; }

/* Region pages only: 1-row auto-scrolling carousel of the 5 NSEO service cards (content duplicated once for a seamless loop) */
.related-slider { margin-top: 16px; overflow: hidden; -webkit-mask-image: linear-gradient(90deg, transparent, #000 5%, #000 95%, transparent); mask-image: linear-gradient(90deg, transparent, #000 5%, #000 95%, transparent); }
.related-slider-track { display: flex; gap: 14px; width: max-content; animation: ff-marquee 26s linear infinite; }
.related-slider-track .related-card { flex: 0 0 220px; }
.related-slider:hover .related-slider-track, .related-slider:focus-within .related-slider-track { animation-play-state: paused; }
@keyframes ff-marquee { from { transform: translateX(0); } to { transform: translateX(-50%); } }
@media (prefers-reduced-motion: reduce) {
  .related-slider { overflow-x: auto; }
  .related-slider-track { animation: none; }
}

/* ===== Compare section photo grid (3x2, last cell = case-gallery CTA) ===== */
.compare-title { white-space: nowrap; font-size: clamp(0.92rem, 3.6vw, 2rem); }
.compare-photo-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; margin-top: 28px; }
.compare-photo-card { position: relative; display: block; aspect-ratio: 4/3; border-radius: var(--radius); overflow: hidden; border: 1px solid var(--color-line); background: var(--color-bg-panel); }
.compare-photo-card img { width: 100%; height: 100%; object-fit: cover; }
.cpc-label {
  position: absolute; left: 0; right: 0; bottom: 0; padding: 10px 14px; font-weight: 700; font-size: 0.9rem;
  color: #fff; background: linear-gradient(transparent, rgba(31,43,42,.78));
}
.compare-photo-cta {
  display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 8px;
  background: var(--color-primary); color: var(--color-white);
}
.compare-photo-cta .cpc-icon { font-size: 1.6rem; font-weight: 700; }
.compare-photo-cta .cpc-label { position: static; background: none; padding: 0; color: var(--color-white); }

/* ===== Case gallery page ===== */
.case-cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.case-card { background: var(--color-bg-panel); border-radius: var(--radius); overflow: hidden; border: 1px solid var(--color-line); display: block; }
.case-card img { width: 100%; aspect-ratio: 4/3; object-fit: cover; }
.case-card-body { padding: 14px 16px; }
.case-card-region { font-size: 0.78rem; font-weight: 700; color: var(--color-primary-dark); }
.case-card-name { margin-top: 4px; font-weight: 700; font-size: 1rem; }

/* ===== CTA band ===== */
.cta-band { background: var(--color-primary-dark); color: var(--color-white); padding: 56px 0; text-align: center; }
.cta-band h2 { font-size: 1.5rem; font-weight: 700; }
.cta-band p { margin-top: 10px; opacity: 0.85; }
.cta-band .cta-row { margin-top: 22px; }
.cta-band .btn-call { background: var(--color-white); color: var(--color-primary-dark); }

.info-card-row { display: flex; gap: 12px; flex-wrap: wrap; margin: 28px 0; }
.info-card { background: var(--color-bg-panel); border: 1px solid var(--color-line); border-radius: 12px; padding: 12px 18px; display: flex; flex-direction: column; gap: 4px; }
.info-card .k { font-size: 0.78rem; color: var(--color-text-sub); }
.info-card .v { font-size: 0.98rem; font-weight: 700; }

.page-hero { background: var(--color-bg-soft); padding: 52px 0 40px; }
.page-hero h1 { font-size: clamp(1.7rem, 3.6vw, 2.2rem); font-weight: 800; }
.page-hero .desc { margin-top: 14px; font-size: 1.02rem; color: var(--color-text-sub); max-width: 640px; }
.page-hero .cta-row { margin-top: 22px; }

.mobile-call-fixed { display: none; }

.site-footer { background: var(--color-bg-panel); border-top: 1px solid var(--color-line); padding: 40px 0 90px; }
.site-footer-inner { display: flex; flex-direction: column; gap: 14px; }
.footer-brand { font-weight: 800; color: var(--color-primary-dark); }
.footer-biz { display: flex; flex-wrap: wrap; gap: 14px; font-size: 0.85rem; color: var(--color-text-sub); }
.footer-biz a { color: var(--color-primary-dark); font-weight: 700; }
.footer-links { display: flex; flex-wrap: wrap; gap: 14px; font-size: 0.85rem; }
.footer-links a { color: var(--color-text-sub); }

/* ===== Rhythm: scroll reveal + hover lift ===== */
.js .section-head, .js .check-card, .js .compare-col, .js .cf-box, .js .nseo-card,
.js .related-card, .js .compare-photo-card, .js .case-card, .js .faq-item {
  opacity: 0; transform: translateY(20px); transition: opacity .6s ease, transform .6s ease;
}
.js .section-head.is-visible, .js .check-card.is-visible, .js .compare-col.is-visible, .js .cf-box.is-visible,
.js .nseo-card.is-visible, .js .related-card.is-visible, .js .compare-photo-card.is-visible,
.js .case-card.is-visible, .js .faq-item.is-visible {
  opacity: 1; transform: none;
}
@media (prefers-reduced-motion: reduce) {
  .js .section-head, .js .check-card, .js .compare-col, .js .cf-box, .js .nseo-card,
  .js .related-card, .js .compare-photo-card, .js .case-card, .js .faq-item {
    opacity: 1 !important; transform: none !important; transition: none !important;
  }
}
.check-card, .nseo-card, .related-card, .compare-photo-card, .case-card {
  transition: transform .2s ease, box-shadow .2s ease;
}
.check-card:hover, .nseo-card:hover, .related-card:hover, .compare-photo-card:hover, .case-card:hover {
  transform: translateY(-4px); box-shadow: 0 10px 24px rgba(31,43,42,.10);
}
.faq-item { transition: box-shadow .2s ease; }
.faq-item[open] { box-shadow: 0 6px 18px rgba(31,43,42,.08); }
.faq-a { animation: ff-fade-in .25s ease; }
@keyframes ff-fade-in { from { opacity: 0; transform: translateY(-4px); } to { opacity: 1; transform: none; } }

/* ===== Responsive ===== */
@media (max-width: 860px) {
  .diag-hero-inner { grid-template-columns: 1fr; }
  .diag-hero-photo-text { height: 280px; }
  .diag-hero-photos { height: auto; }
  .diag-hero-photos figure { height: 200px; }
  .diag-hero-copy { flex: none; }
  .check-grid { grid-template-columns: repeat(2, 1fr); }
  .compare-grid { grid-template-columns: 1fr; }
  .nseo-cards { grid-template-columns: repeat(3, 1fr); }
  .space-guide-list { grid-template-columns: repeat(3, 1fr); }
  .compare-photo-grid { grid-template-columns: repeat(2, 1fr); }
  .related-cards { grid-template-columns: repeat(2, 1fr); }
  .cf-stack-2 { grid-template-columns: 1fr; }
  .case-cards { grid-template-columns: repeat(2, 1fr); }
  .site-nav { display: none; position: absolute; top: 68px; left: 0; right: 0; background: var(--color-white); flex-direction: column; gap: 0; border-bottom: 1px solid var(--color-line); padding: 8px 24px; }
  .site-nav.is-open { display: flex; }
  .site-nav a { padding: 12px 0; border-top: 1px solid var(--color-line); }
  .site-nav a:first-child { border-top: none; }
  .nav-toggle { display: block; margin-left: auto; }
}
@media (max-width: 480px) {
  .check-grid { grid-template-columns: 1fr 1fr; }
  .nseo-cards { grid-template-columns: repeat(2, 1fr); }
  .space-guide-list { grid-template-columns: repeat(2, 1fr); }
  .related-cards { grid-template-columns: 1fr 1fr; }
  .compare-photo-grid { grid-template-columns: 1fr; }
  .pair-box { height: 200px; }
  .cf-box { height: 300px; }
  .mobile-call-fixed {
    display: block; position: fixed; left: 16px; right: 16px; bottom: 16px; z-index: 50;
  }
  .mobile-call-fixed .btn-call { display: flex; justify-content: center; width: 100%; box-shadow: 0 6px 18px rgba(36,83,79,.28); }
  section { padding: 48px 0; }
}