/* ============================================================
   UNBOUND STAIRNET — INDUSTRIAL SAFETY + ARCHITECTURAL GRID
   ============================================================ */
:root{
  --charcoal:#1A1D21;
  --charcoal-2:#24282E;
  --charcoal-3:#31363D;
  --orange:#F5C518;
  --orange-dim:#8A6300;
  --ivory:#F5F1E8;
  --ivory-2:#EDE7D8;
  --steel:#6B7280;
  --steel-light:#9CA3AF;
  --steel-line:#DAD4C4;
  --ink:#1A1D21;
  --white:#FFFFFF;
  --radius:2px;
}
*{box-sizing:border-box;margin:0;padding:0;}
html{scroll-behavior:smooth;}
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto;}
  *{animation-duration:.01ms!important;animation-iteration-count:1!important;transition-duration:.01ms!important;}
}
body{
  font-family:'IBM Plex Sans KR','Noto Sans KR',sans-serif;
  color:var(--ink);
  background:var(--ivory);
  line-height:1.75;
  word-break:keep-all;
  overflow-wrap:break-word;
  overflow-x:hidden;
}
img{max-width:100%;display:block;}
a{color:inherit;text-decoration:none;}
ul{list-style:none;}
button{font-family:inherit;}
.wrap{max-width:1200px;margin:0 auto;padding:0 24px;}
:focus-visible{outline:3px solid var(--orange);outline-offset:2px;}

/* Architectural grid backdrop (subtle) */
.grid-bg{
  background-image:
    linear-gradient(rgba(107,114,128,.08) 1px, transparent 1px),
    linear-gradient(90deg, rgba(107,114,128,.08) 1px, transparent 1px);
  background-size:40px 40px;
}

/* ── Skip link ── */
.skip-link{
  position:absolute;left:-999px;top:0;background:var(--orange);color:var(--charcoal);padding:10px 18px;z-index:200;font-weight:700;
}
.skip-link:focus{left:12px;top:12px;}

/* ── Header ── */
header.site-header{
  position:sticky;top:0;z-index:100;
  background:var(--charcoal);
  border-bottom:2px solid var(--orange);
}
.header-inner{
  max-width:1200px;margin:0 auto;padding:14px 24px;
  display:flex;align-items:center;justify-content:space-between;gap:18px;
}
.logo{display:flex;align-items:center;gap:10px;font-weight:700;font-size:1.05rem;color:#fff;letter-spacing:.02em;}
.logo img{width:34px;height:34px;}
.logo small{display:block;font-weight:400;font-size:.62rem;color:var(--steel-light);letter-spacing:.14em;text-transform:uppercase;margin-top:2px;}
.nav-links{display:flex;align-items:center;gap:26px;font-size:.9rem;font-weight:500;margin-left:auto;}
.nav-links a{color:#D7D9DC;position:relative;padding:4px 0;}
.nav-links a:hover,.nav-links a:focus-visible{color:#fff;}
.nav-links a::after{
  content:"";position:absolute;left:0;bottom:-2px;width:0;height:2px;background:var(--orange);transition:width .2s ease;
}
.nav-links a:hover::after{width:100%;}
.header-cta{
  background:var(--orange);color:var(--charcoal)!important;padding:10px 20px;
  font-weight:700;font-size:.86rem;white-space:nowrap;border:1px solid var(--orange);
}
.header-cta:hover{background:var(--charcoal);border-color:var(--orange);color:#fff!important;}
.nav-toggle{
  display:none;background:none;border:1px solid var(--steel);color:#fff;width:42px;height:38px;
  align-items:center;justify-content:center;cursor:pointer;
}
.nav-toggle span,.nav-toggle span::before,.nav-toggle span::after{
  content:"";display:block;width:20px;height:2px;background:#fff;position:relative;transition:transform .2s ease,opacity .2s ease;
}
.nav-toggle span::before{position:absolute;top:-6px;}
.nav-toggle span::after{position:absolute;top:6px;}
.nav-toggle[aria-expanded="true"] span{background:transparent;}
.nav-toggle[aria-expanded="true"] span::before{transform:translateY(6px) rotate(45deg);}
.nav-toggle[aria-expanded="true"] span::after{transform:translateY(-6px) rotate(-45deg);}

@media (max-width:860px){
  .nav-links{
    display:none;position:absolute;top:100%;left:0;right:0;background:var(--charcoal);
    flex-direction:column;align-items:flex-start;gap:0;padding:8px 0;border-bottom:2px solid var(--orange);
  }
  .nav-links.open{display:flex;}
  .nav-links a{width:100%;padding:14px 24px;border-bottom:1px solid var(--charcoal-3);}
  .nav-links a::after{display:none;}
  .nav-toggle{display:flex;}
  .header-cta{padding:9px 14px;font-size:.78rem;}
  .logo{font-size:.92rem;}
  .logo img{width:28px;height:28px;}
}

/* ── Breadcrumb ── */
.breadcrumb{font-size:.8rem;color:var(--steel);padding:14px 0 0;}
.breadcrumb a{color:var(--orange-dim);font-weight:600;display:inline-block;padding:6px 0;}
.breadcrumb a:hover{text-decoration:underline;}

/* ── Hero: asymmetric 55/45 split ── */
.hero{
  display:grid;grid-template-columns:55% 45%;background:var(--charcoal);color:#fff;overflow:hidden;position:relative;
}
.hero-panel{
  padding:72px 56px;display:flex;flex-direction:column;justify-content:center;gap:22px;position:relative;z-index:2;
}
.hero-eyebrow{
  display:inline-flex;align-items:center;gap:10px;font-size:.76rem;letter-spacing:.24em;text-transform:uppercase;
  font-weight:700;color:var(--orange);
}
.hero-eyebrow::before{content:"";width:28px;height:2px;background:var(--orange);display:inline-block;}
.hero-panel h1{
  font-size:clamp(2.2rem,4.4vw,3.4rem);font-weight:700;line-height:1.22;letter-spacing:-.01em;color:#fff;
}
.hero-lead{font-size:1.05rem;color:#C7CBD1;max-width:520px;}
.hero-actions{display:flex;gap:14px;flex-wrap:wrap;margin-top:6px;}
.btn{
  display:inline-flex;align-items:center;gap:8px;padding:15px 28px;
  font-weight:700;font-size:.94rem;cursor:pointer;border:2px solid transparent;
  transition:background-color .18s ease,color .18s ease,border-color .18s ease;
}
.btn-primary{background:var(--orange);color:var(--charcoal);border-color:var(--orange);}
.btn-primary:hover{background:transparent;color:var(--orange);}
.btn-outline{background:transparent;color:#fff;border-color:rgba(255,255,255,.45);}
.btn-outline:hover{border-color:#fff;background:rgba(255,255,255,.08);}
.btn-tel{background:#fff;color:var(--charcoal);border-color:#fff;}
.btn-tel:hover{background:transparent;color:#fff;}

.hero-figure{position:relative;overflow:hidden;}
.hero-figure img{width:100%;height:100%;object-fit:cover;}
.hero-figure::before{
  content:"";position:absolute;inset:0;
  background:linear-gradient(100deg, var(--charcoal) 0%, rgba(26,29,33,.15) 28%, transparent 55%);
  z-index:1;pointer-events:none;
}
.hero-chips{position:absolute;left:24px;bottom:24px;z-index:2;display:flex;flex-direction:column;gap:8px;}
.hero-chip{
  background:rgba(26,29,33,.86);color:#fff;font-size:.72rem;font-weight:700;letter-spacing:.1em;
  padding:8px 14px;border-left:3px solid var(--orange);text-transform:uppercase;backdrop-filter:blur(2px);
}
@media (max-width:900px){
  .hero{grid-template-columns:1fr;}
  .hero-panel{padding:52px 24px 36px;order:2;}
  .hero-figure{height:320px;order:1;}
}
@media (max-width:480px){
  .hero-actions{flex-direction:column;}
  .hero-actions .btn{width:100%;justify-content:center;}
  .hero-chips{left:14px;bottom:14px;}
}

/* ── Sections ── */
.section{padding:68px 0;}
.section-alt{background:#fff;}
.section-tag{
  display:inline-flex;align-items:center;gap:10px;font-size:.76rem;font-weight:700;letter-spacing:.2em;
  text-transform:uppercase;color:var(--orange-dim);margin-bottom:12px;
}
.section-tag::before{content:"";width:24px;height:2px;background:var(--orange);display:inline-block;}
.section h2{font-size:clamp(1.5rem,2.6vw,2.05rem);font-weight:700;color:var(--charcoal);margin-bottom:16px;letter-spacing:-.01em;}
.section h3{color:var(--charcoal);font-weight:700;}
.section p.desc{color:var(--steel);max-width:760px;margin-bottom:30px;}
.answer-lead{
  font-size:1.05rem;color:var(--ink);background:var(--ivory);border-left:4px solid var(--orange);
  padding:22px 26px;margin:20px 0 36px;
}

/* ── Why cards (numbered) ── */
.why-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:1px;background:var(--steel-line);margin-top:8px;border:1px solid var(--steel-line);}
.why-card{background:#fff;padding:32px 26px;}
.why-card .num{font-size:2.1rem;font-weight:700;color:var(--orange-dim);line-height:1;margin-bottom:14px;font-family:'IBM Plex Sans KR',sans-serif;}
.why-card h3{font-size:1.02rem;margin-bottom:10px;}
.why-card p{font-size:.88rem;color:var(--steel);}
@media (max-width:900px){.why-grid{grid-template-columns:repeat(2,1fr);}}
@media (max-width:520px){.why-grid{grid-template-columns:1fr;}}

/* ── Applications icon grid ── */
.app-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;margin-top:8px;}
.app-card{
  background:#fff;border:1px solid var(--steel-line);padding:28px 24px;
  clip-path:polygon(0 0,100% 0,100% calc(100% - 18px),calc(100% - 18px) 100%,0 100%);
  transition:border-color .2s ease;
}
.app-card:hover{border-color:var(--orange);}
.app-card .icon{display:block;width:46px;height:46px;color:var(--orange-dim);margin-bottom:16px;}
.app-card h3{font-size:1rem;margin-bottom:8px;}
.app-card p{font-size:.86rem;color:var(--steel);}
@media (max-width:900px){.app-grid{grid-template-columns:repeat(2,1fr);}}
@media (max-width:520px){.app-grid{grid-template-columns:1fr;}}

/* ── Photo feature (image + text pairing for image-NSEO) ── */
.photo-feature{display:grid;grid-template-columns:1fr 1fr;gap:40px;align-items:center;margin-top:8px;}
.photo-feature.reverse .pf-figure{order:2;}
.pf-figure{position:relative;overflow:hidden;box-shadow:0 14px 34px rgba(26,29,33,.14);}
.pf-figure img{width:100%;height:100%;object-fit:cover;aspect-ratio:4/3;}
.pf-figure::after{content:"";position:absolute;inset:0;border:1px solid rgba(255,255,255,.25);pointer-events:none;}
.pf-body h3{font-size:1.2rem;margin-bottom:12px;}
.pf-body p{color:var(--steel);margin-bottom:10px;}
.pf-caption{font-size:.84rem;color:var(--steel);border-left:3px solid var(--steel-line);padding-left:14px;margin-top:14px;}
@media (max-width:860px){
  .photo-feature,.photo-feature.reverse{grid-template-columns:1fr;gap:22px;}
  .photo-feature.reverse .pf-figure{order:0;}
}

/* ── Photo grid (site-wide gallery strip) ── */
.photo-strip{display:grid;grid-template-columns:repeat(2,1fr);gap:20px;margin-top:8px;}
.photo-strip figure{position:relative;overflow:hidden;box-shadow:0 10px 26px rgba(26,29,33,.1);}
.photo-strip img{width:100%;height:100%;object-fit:cover;aspect-ratio:4/3;}
.photo-strip figcaption{padding:12px 16px;background:#fff;font-size:.84rem;color:var(--steel);border-top:2px solid var(--orange);}
@media (max-width:760px){.photo-strip{grid-template-columns:1fr;}}

/* ── Process flow ── */
.process{display:flex;align-items:stretch;gap:0;counter-reset:step;margin-top:8px;}
.process-step{
  flex:1;min-width:0;position:relative;padding:28px 18px;text-align:center;background:#fff;border:1px solid var(--steel-line);
}
.process-step .num{
  width:36px;height:36px;background:var(--charcoal);color:#fff;display:flex;align-items:center;justify-content:center;
  font-weight:700;margin:0 auto 14px;font-size:.92rem;
}
.process-step h3{font-size:.94rem;margin-bottom:6px;}
.process-step p{font-size:.8rem;color:var(--steel);}
.process-arrow{display:flex;align-items:center;justify-content:center;color:var(--orange-dim);font-size:1.3rem;font-weight:700;padding:0 4px;flex:none;}
@media (max-width:900px){
  .process{flex-direction:column;}
  .process-step{text-align:left;padding:20px 20px 20px 74px;}
  .process-step .num{position:absolute;left:20px;top:20px;margin:0;}
  .process-arrow{transform:rotate(90deg);margin:-2px 0;justify-content:flex-start;padding-left:34px;}
}

/* ── Checklist ── */
.check-list{margin-top:8px;}
.check-list li{position:relative;padding:10px 0 10px 30px;border-bottom:1px solid var(--steel-line);font-size:.94rem;}
.check-list li:last-child{border-bottom:none;}
.check-list li::before{content:"✓";position:absolute;left:0;top:10px;color:var(--orange-dim);font-weight:900;}

/* ── Tables ── */
table.info-table{width:100%;border-collapse:collapse;background:#fff;margin-bottom:10px;table-layout:fixed;border:1px solid var(--steel-line);}
table.info-table th,table.info-table td{padding:14px 18px;text-align:left;border-bottom:1px solid var(--steel-line);font-size:.9rem;vertical-align:top;line-height:1.6;}
table.info-table th{background:var(--charcoal);color:#fff;font-weight:700;font-size:.84rem;letter-spacing:.02em;}
table.info-table tr:last-child td{border-bottom:none;}
table.info-table td.muted{color:var(--steel);}
.table-note{font-size:.82rem;color:var(--steel);margin-top:10px;}
@media (max-width:760px){
  table.info-table th,table.info-table td{padding:10px 8px;font-size:.8rem;line-height:1.5;}
}

/* ── Info box / callout ── */
.info-box{background:var(--charcoal);color:#fff;padding:28px 30px;margin:28px 0;border-left:4px solid var(--orange);}
.info-box h3{color:#fff;font-size:1.02rem;margin-bottom:10px;}
.info-box p{color:#C7CBD1;font-size:.92rem;}

/* ── Related links ── */
.related-links{display:grid;grid-template-columns:repeat(auto-fill,minmax(230px,1fr));gap:14px;margin-top:8px;}
.related-links .card{display:block;background:#fff;border:1px solid var(--steel-line);padding:18px 20px;transition:border-color .2s ease,transform .2s ease;}
.related-links .card:hover{border-color:var(--orange);transform:translateY(-3px);}
.related-links .card h3{font-size:.95rem;margin-bottom:6px;}
.related-links .card p{font-size:.82rem;color:var(--steel);}

/* ── Related links (photo card variant) ── */
.related-photo-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:20px;margin-top:8px;}
.related-photo-card{
  display:block;background:#fff;border:1px solid var(--steel-line);overflow:hidden;
  transition:border-color .2s ease,transform .2s ease,box-shadow .2s ease;
}
.related-photo-card:hover{border-color:var(--orange);transform:translateY(-4px);box-shadow:0 14px 30px rgba(26,29,33,.12);}
.related-photo-card figure{overflow:hidden;}
.related-photo-card img{width:100%;height:100%;object-fit:cover;aspect-ratio:4/3;transition:transform .5s ease;}
.related-photo-card:hover img{transform:scale(1.06);}
.related-photo-card .body{padding:16px 18px;}
.related-photo-card h3{font-size:.94rem;margin-bottom:6px;color:var(--charcoal);}
.related-photo-card p{font-size:.8rem;color:var(--steel);}
@media (max-width:520px){.related-photo-grid{grid-template-columns:1fr;}}

/* ── FAQ (custom accordion, button + aria-expanded) ── */
.faq-list{margin-top:8px;}
.faq-item{background:#fff;border:1px solid var(--steel-line);border-left:4px solid var(--orange);margin-bottom:12px;}
.faq-q{
  width:100%;text-align:left;background:none;border:none;cursor:pointer;
  padding:18px 20px;font-weight:700;font-size:.96rem;color:var(--charcoal);
  display:flex;align-items:center;gap:14px;
}
.faq-q .q-mark{
  flex:none;width:26px;height:26px;background:var(--orange);color:var(--charcoal);font-size:.76rem;font-weight:900;
  display:flex;align-items:center;justify-content:center;
}
.faq-q .caret{margin-left:auto;flex:none;font-size:.8rem;color:var(--steel);transition:transform .2s ease;}
.faq-q[aria-expanded="true"] .caret{transform:rotate(180deg);}
.faq-q[aria-expanded="true"]{border-bottom:1px solid var(--steel-line);}
.faq-a{padding:16px 20px 20px 60px;color:var(--steel);font-size:.9rem;}
.faq-a[hidden]{display:none;}
.faq-more{display:none;}
.faq-more.show{display:block;}
.faq-toggle-btn{
  display:block;margin:16px auto 0;padding:13px 32px;background:transparent;border:2px solid var(--charcoal);
  color:var(--charcoal);font-weight:700;cursor:pointer;font-size:.9rem;
}
.faq-toggle-btn:hover{background:var(--charcoal);color:#fff;}

/* ── CTA band ── */
.cta-band{background:var(--orange);color:var(--charcoal);padding:60px 0;text-align:center;position:relative;}
.cta-band h2{color:var(--charcoal);font-size:clamp(1.4rem,2.4vw,1.9rem);margin-bottom:12px;}
.cta-band p{color:rgba(26,29,33,.82);margin-bottom:28px;}
.cta-band .hero-actions{justify-content:center;}
.cta-band .btn-primary{background:var(--charcoal);border-color:var(--charcoal);color:#fff;}
.cta-band .btn-primary:hover{background:transparent;color:var(--charcoal);border-color:var(--charcoal);}
.cta-band .btn-outline{border-color:rgba(26,29,33,.5);color:var(--charcoal);}
.cta-band .btn-outline:hover{border-color:var(--charcoal);background:rgba(26,29,33,.08);color:var(--charcoal);}

/* ── Consultation call box ── */
.call-box{background:var(--charcoal);color:#fff;padding:38px;text-align:center;margin:28px 0;border-top:4px solid var(--orange);}
.call-box h3{color:#fff;font-size:1.15rem;margin-bottom:10px;}
.call-box p{color:#C7CBD1;margin-bottom:20px;}
.call-number{display:inline-block;font-size:1.75rem;font-weight:700;color:var(--orange);letter-spacing:.02em;margin-bottom:8px;}
.call-note{font-size:.82rem;color:var(--steel-light);margin-top:14px;}
.call-actions{display:flex;gap:14px;justify-content:center;flex-wrap:wrap;margin-top:20px;}
@media (max-width:480px){.call-actions{flex-direction:column;}.call-actions .btn{width:100%;justify-content:center;}}

/* ── Footer ── */
footer.site-footer{background:var(--charcoal);color:#B6BAC0;padding:48px 0 26px;font-size:.86rem;}
.ftr-grid{display:flex;flex-wrap:wrap;justify-content:space-between;gap:32px;margin-bottom:28px;}
.ftr-biz p{margin-bottom:6px;}
.ftr-biz .f-logo{display:flex;align-items:center;gap:8px;font-weight:700;color:#fff;font-size:1.05rem;margin-bottom:12px;}
.ftr-biz .f-logo img{width:28px;height:28px;}
.ftr-nav{display:flex;flex-direction:column;gap:2px;}
.ftr-nav a{display:inline-block;padding:8px 0;}
.ftr-nav a:hover{color:var(--orange);}
.ftr-cta{display:inline-block;margin-top:6px;background:var(--orange);color:var(--charcoal);padding:10px 20px;font-weight:700;font-size:.84rem;}
.ftr-cta:hover{background:#fff;color:var(--charcoal);}
.ftr-copy{border-top:1px solid rgba(255,255,255,.12);padding-top:18px;color:#7C818A;font-size:.78rem;}

/* ── Utility ── */
.tag-pill{display:inline-block;background:var(--ivory-2);color:var(--charcoal);font-size:.78rem;font-weight:700;padding:6px 14px;margin-bottom:14px;}
.svg-icon{width:100%;height:100%;fill:none;stroke:currentColor;stroke-width:1.6;stroke-linecap:round;stroke-linejoin:round;}