/* =========================================================
   SERO 에어컨 청소 전문업체 - 랜딩페이지 스타일
   ========================================================= */

:root{
  --navy: #0b2545;
  --deep-navy: #08192f;
  --sky: #3ea8ff;
  --air-blue: #2e7ee0;
  --mint: #14d8c4;
  --cyan: #17c3e6;
  --white: #ffffff;
  --off-white: #f5f9fc;
  --gray-100: #eef2f6;
  --gray-300: #ccd6e0;
  --gray-500: #7c8ba1;
  --gray-700: #445369;
  --text-dark: #0f2033;
  --shadow-soft: 0 20px 50px -20px rgba(11,37,69,0.25);
  --radius-lg: 24px;
  --radius-md: 16px;
  --radius-sm: 10px;
  --font: 'Pretendard','Inter',-apple-system,BlinkMacSystemFont,'Segoe UI',sans-serif;
}

*{box-sizing:border-box;}
html{scroll-behavior:smooth;}
body{
  margin:0;
  font-family:var(--font);
  color:var(--text-dark);
  background:var(--white);
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
img{max-width:100%;display:block;}
a{text-decoration:none;color:inherit;}
ul{list-style:none;margin:0;padding:0;}
.container{max-width:1180px;margin:0 auto;padding:0 24px;}
.section{padding:110px 0;position:relative;}
@media (max-width:768px){
  .section{padding:70px 0;}
}

.section-kicker{
  font-size:14px;
  font-weight:800;
  letter-spacing:0.2em;
  color:var(--air-blue);
  text-transform:uppercase;
  margin:0 0 16px;
  text-align:center;
}
.section-title{
  font-size:40px;
  font-weight:800;
  line-height:1.35;
  text-align:center;
  margin:0 0 24px;
  color:var(--navy);
  letter-spacing:-0.02em;
}
.section-desc{
  font-size:17px;
  line-height:1.8;
  color:var(--gray-700);
  text-align:center;
  max-width:640px;
  margin:0 auto 50px;
}
.accent-text{color:var(--air-blue);}
@media (max-width:768px){
  .section-title{font-size:28px;}
  .section-desc{font-size:15px;}
}

/* ---------- Buttons ---------- */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:10px;
  padding:14px 28px;
  border-radius:100px;
  font-weight:700;
  font-size:15px;
  border:none;
  cursor:pointer;
  transition:transform .25s ease, box-shadow .25s ease, background .25s ease, color .25s ease;
  white-space:nowrap;
}
.btn-primary{
  background:linear-gradient(135deg, var(--air-blue), var(--sky));
  color:#fff;
  box-shadow:0 14px 30px -8px rgba(46,126,224,0.55);
}
.btn-primary:hover{transform:translateY(-3px);box-shadow:0 20px 40px -8px rgba(46,126,224,0.6);}
.btn-outline{
  background:transparent;
  border:2px solid var(--navy);
  color:var(--navy);
}
.btn-outline:hover{background:var(--navy);color:#fff;transform:translateY(-3px);}
.btn-outline-white{
  background:transparent;
  border:2px solid rgba(255,255,255,0.8);
  color:#fff;
}
.btn-outline-white:hover{background:#fff;color:var(--navy);transform:translateY(-3px);}
.btn-lg{padding:17px 34px;font-size:16px;}
.btn-full{width:100%;}

/* ---------- Header ---------- */
.site-header{
  position:fixed;
  top:0;left:0;right:0;
  z-index:500;
  background:transparent;
  transition:background .35s ease, box-shadow .35s ease, padding .35s ease;
  padding:20px 0;
}
.site-header.scrolled{
  background:rgba(255,255,255,0.92);
  backdrop-filter:blur(12px);
  box-shadow:0 6px 24px -6px rgba(11,37,69,0.15);
  padding:12px 0;
}
.header-inner{
  max-width:1180px;
  margin:0 auto;
  padding:0 24px;
  display:flex;
  align-items:center;
  justify-content:space-between;
}
.logo{
  font-size:22px;
  font-weight:900;
  color:var(--navy);
  letter-spacing:0.02em;
}
.logo span{color:var(--air-blue);font-weight:700;font-size:16px;margin-left:4px;}
.main-nav{
  display:flex;
  gap:36px;
}
.main-nav a{
  font-size:15px;
  font-weight:600;
  color:var(--navy);
  position:relative;
  transition:color .2s;
}
.main-nav a:hover{color:var(--air-blue);}
.header-actions{display:flex;align-items:center;gap:14px;}
.btn-call-header{
  display:flex;align-items:center;gap:8px;
  background:var(--navy);
  color:#fff;
  padding:10px 20px;
  border-radius:100px;
  font-size:14px;
  font-weight:700;
  transition:background .2s, transform .2s;
}
.btn-call-header:hover{background:var(--air-blue);transform:translateY(-2px);}
.btn-admin-header{
  display:flex;
  align-items:center;
  justify-content:center;
  width:38px;
  height:38px;
  border-radius:50%;
  background:var(--gray-100);
  color:var(--gray-500);
  font-size:14px;
  transition:transform .25s ease, background .25s ease, color .25s ease, box-shadow .25s ease;
}
.btn-admin-header:hover{
  transform:scale(1.12);
  background:var(--navy);
  color:#fff;
  box-shadow:0 0 0 6px rgba(46,126,224,0.15);
}
.nav-toggle{
  display:none;
  background:none;border:none;
  font-size:22px;color:var(--navy);
  cursor:pointer;
}

@media (max-width:900px){
  .main-nav{
    position:fixed;
    top:0;right:-100%;
    width:72%;
    max-width:320px;
    height:100vh;
    background:#fff;
    flex-direction:column;
    padding:100px 32px 32px;
    gap:26px;
    box-shadow:-10px 0 40px rgba(0,0,0,0.15);
    transition:right .35s ease;
    z-index:600;
  }
  .main-nav.open{right:0;}
  .nav-toggle{display:block;}
  .btn-call-header span{display:none;}
}

/* ---------- HERO ---------- */
.hero{
  position:relative;
  min-height:100vh;
  display:flex;
  flex-direction:column;
  justify-content:center;
  padding:140px 0 60px;
  background:
    radial-gradient(circle at 15% 20%, rgba(62,168,255,0.12), transparent 45%),
    radial-gradient(circle at 85% 75%, rgba(20,216,196,0.10), transparent 50%),
    linear-gradient(180deg, #ffffff 0%, #f2f8fd 60%, #eaf4fb 100%);
  overflow:hidden;
}
.hero-bg-image{
  position:absolute;
  inset:0;
  z-index:0;
  opacity:0.55;
  mix-blend-mode:normal;
}
.hero-bg-image img{
  width:100%;
  height:100%;
  object-fit:cover;
  object-position:center 30%;
  filter:saturate(1.1) contrast(1.05);
}
.hero-bg-tint{
  position:absolute;
  inset:0;
  z-index:1;
  background:linear-gradient(180deg, rgba(255,255,255,0.32) 0%, rgba(242,248,253,0.5) 55%, rgba(234,244,251,0.72) 100%);
}
.hero-container{
  position:relative;
  z-index:2;
  max-width:860px;
  margin:0 auto;
  padding:0 24px;
  display:flex;
  flex-direction:column;
  align-items:center;
  text-align:center;
}
.hero-kicker{
  font-size:13px;
  font-weight:800;
  letter-spacing:0.25em;
  color:var(--air-blue);
  margin:0 0 18px;
}
.hero-title{
  font-size:clamp(28px, 4vw, 46px);
  font-weight:900;
  line-height:1.35;
  margin:0 0 26px;
  color:var(--navy);
  letter-spacing:-0.02em;
}
.hero-title-strong{color:var(--gray-700);font-weight:700;font-size:0.7em;}
.hero-break-mobile{display:none;}
.hero-title-accent{
  background:linear-gradient(135deg, var(--air-blue), var(--mint));
  -webkit-background-clip:text;
  background-clip:text;
  color:transparent;
}
.hero-sub{
  font-size:18px;
  line-height:1.75;
  color:var(--gray-700);
  margin:0 0 40px;
  max-width:680px;
}
.hero-sub strong{color:var(--navy);}
.hero-cta{display:flex;gap:16px;flex-wrap:wrap;justify-content:center;margin-top:36px;}

.hero-visual{position:relative;width:100%;margin-top:44px;}
/* PC/웹: "실제 세척수" / "청소 완료" 박스를 메인 이미지 하단에 가로로 나란히 배치.
   hero-float-row는 hero-image-main과 동일한 전체 폭(100%)을 가지므로,
   두 박스(gap 포함)의 전체 가로 길이가 메인 이미지의 가로 길이와 정확히 일치한다. */
.hero-float-row{
  display:flex;
  flex-wrap:nowrap;
  gap:20px;
  margin-top:24px;
  width:100%;
}
.hero-image-main{
  position:relative;
  border-radius:var(--radius-lg);
  overflow:hidden;
  box-shadow:var(--shadow-soft);
  aspect-ratio:4/3;
}
.hero-image-main img,
.hero-image-main video{width:100%;height:100%;object-fit:cover;object-position:65% center;display:block;}

/* 히어로 메인 영상 위에 겹쳐서 나타났다 사라지는 SERO 로고 텍스트 애니메이션 */
.hero-video-logo{
  position:absolute;
  top:50%;left:50%;
  transform:translate(-50%,-50%);
  z-index:2;
  font-weight:900;
  letter-spacing:0.02em;
  color:#fff;
  font-size:clamp(56px, 8vw, 92px); /* 메인 카피(.hero-title) 폰트 크기의 약 2배 */
  text-shadow:0 4px 24px rgba(0,0,0,0.35), 0 1px 4px rgba(0,0,0,0.3);
  pointer-events:none;
  animation:hero-video-logo-fade 4.5s ease-in-out infinite;
  white-space:nowrap;
}
@keyframes hero-video-logo-fade{
  0%, 100%{opacity:0;}
  15%, 45%{opacity:1;}
  60%{opacity:0;}
}
.hero-image-float{
  position:static;
  border-radius:var(--radius-md);
  overflow:hidden;
  box-shadow:0 16px 36px -10px rgba(11,37,69,0.35);
  border:4px solid #fff;
  flex:1 1 0;      /* 두 박스가 항상 정확히 50:50 비율로 전체 폭을 균등하게 나눠 가짐 */
  min-width:0;     /* flex 아이템 축소 시 내용으로 인한 오버플로우 방지 */
}
.hero-image-float img,
.hero-image-float video{
  width:100%;
  height:auto;
  aspect-ratio:170/120;  /* 기존 비율(170px:120px) 그대로 유지하여 이미지 왜곡 없이 폭에 맞춰 스케일 */
  object-fit:cover;
  display:block;
}
.float-tag{
  display:block;
  background:var(--navy);
  color:#fff;
  font-size:12px;
  font-weight:700;
  text-align:center;
  padding:6px 0;
}

.clean-index{
  max-width:1180px;
  margin:70px auto 0;
  padding:0 24px;
  display:grid;
  grid-template-columns:repeat(3,1fr);
  gap:24px;
}
.clean-index{position:relative;z-index:2;}
.clean-index-item{
  background:#fff;
  border-radius:var(--radius-md);
  padding:26px 20px;
  text-align:center;
  box-shadow:0 12px 30px -14px rgba(11,37,69,0.18);
}
.ci-number{
  font-size:40px;
  font-weight:900;
  color:var(--navy);
}
.ci-suffix{font-size:20px;font-weight:800;color:var(--air-blue);margin-left:4px;}
.clean-index-item p{margin:8px 0 0;font-size:13px;font-weight:700;color:var(--gray-500);letter-spacing:0.05em;}

/* ---------- HERO 건강 위험 무한 마퀴 배너 ---------- */
.hero-marquee{
  position:relative;
  z-index:2;
  width:100%;
  margin-top:56px;
  padding:16px 0;
  background:var(--navy);
  overflow:hidden;
  white-space:nowrap;
  -webkit-mask-image:linear-gradient(90deg, transparent 0, #000 6%, #000 94%, transparent 100%);
  mask-image:linear-gradient(90deg, transparent 0, #000 6%, #000 94%, transparent 100%);
}
.hero-marquee-track{
  display:inline-flex;
  align-items:center;
  gap:0;
  animation:hero-marquee-scroll 42s linear infinite;
}
.hero-marquee-item{
  display:inline-flex;
  align-items:center;
  gap:8px;
  padding:0 28px;
  font-size:14px;
  font-weight:700;
  color:rgba(255,255,255,0.92);
  letter-spacing:0.01em;
}
.hero-marquee-item i{color:var(--mint);font-size:12px;}
@keyframes hero-marquee-scroll{
  from{transform:translateX(0);}
  to{transform:translateX(-100%);}
}
@media (max-width:600px){
  .hero-marquee{margin-top:36px;padding:13px 0;}
  .hero-marquee-item{font-size:12.5px;padding:0 18px;}
  .hero-marquee-track{animation-duration:30s;}
}

/* ---------- 섹션 공통: 대각선 패턴 흐린 배경 (PROBLEM / DETAIL / SERO STANDARD) ---------- */
/* 좌대각(/) + 우대각(\) 두 방향의 선 패턴을 겹쳐 교차 격자무늬를 만들고, 흐린 블루 계열로 표현 */
.diagonal-bg{position:relative;overflow:hidden;}
.diagonal-bg::before{
  content:'';
  position:absolute;
  inset:0;
  z-index:0;
  opacity:0.09;
  background-image:
    repeating-linear-gradient(45deg, var(--air-blue) 0, var(--air-blue) 2px, transparent 2px, transparent 28px),
    repeating-linear-gradient(-45deg, var(--air-blue) 0, var(--air-blue) 2px, transparent 2px, transparent 28px);
  pointer-events:none;
}
.diagonal-bg > .container{position:relative;z-index:1;}

/* ---------- 섹션 공통: 전체 이미지 배경 (PROCESS / CONTACT) ---------- */
.section-bg-image{
  position:absolute;
  inset:0;
  z-index:0;
  overflow:hidden;
}
.section-bg-image img{width:100%;height:100%;object-fit:cover;display:block;}
.section-bg-tint{position:absolute;inset:0;z-index:0;}
.process > .container,
.contact > .container{position:relative;z-index:1;}

/* PROCESS: 숲 + 에어컨 이미지를 배경으로, 기존보다 조금 더 선명하게 노출 */
.process-bg-image{opacity:0.48;}
.process-bg-image img{filter:blur(0.5px) saturate(1.1);}
.process-bg-tint{
  background:linear-gradient(180deg, rgba(255,255,255,0.55) 0%, rgba(244,249,253,0.68) 55%, rgba(244,249,253,0.85) 100%);
}

/* CONTACT: 직원 단체 화이팅 사진을 배경으로, 기존보다 조금 더 선명하게 노출 */
.contact-bg-image{opacity:0.9;}
.contact-bg-tint{
  background:linear-gradient(180deg, rgba(245,249,252,0.22) 0%, rgba(245,249,252,0.4) 40%, var(--off-white) 80%);
}

.scroll-down{
  position:absolute;
  bottom:24px;left:50%;
  transform:translateX(-50%);
  color:var(--air-blue);
  font-size:20px;
  animation:bounce 2s infinite;
  z-index:2;
}
@keyframes bounce{0%,100%{transform:translate(-50%,0);}50%{transform:translate(-50%,8px);}}

/* ---------- Bubble Particle Animation (공기방울 애니메이션) ---------- */
.bubble-field{
  position:absolute;
  inset:0;
  z-index:1;
  overflow:hidden;
  pointer-events:none;
}
.bubble{
  position:absolute;
  bottom:-60px;
  border-radius:50%;
  background:radial-gradient(circle at 30% 30%, rgba(255,255,255,0.9), rgba(62,168,255,0.25) 60%, rgba(62,168,255,0.05) 100%);
  border:1px solid rgba(255,255,255,0.5);
  box-shadow:inset 0 0 8px rgba(255,255,255,0.6), 0 0 6px rgba(62,168,255,0.2);
  animation-name:bubble-rise;
  animation-timing-function:ease-in;
  animation-iteration-count:infinite;
}
@keyframes bubble-rise{
  0%{
    transform:translateY(0) translateX(0) scale(0.9);
    opacity:0;
  }
  8%{
    opacity:0.85;
  }
  50%{
    transform:translateY(-55vh) translateX(var(--bubble-drift,20px)) scale(1);
  }
  92%{
    opacity:0.6;
  }
  100%{
    transform:translateY(-115vh) translateX(calc(var(--bubble-drift,20px) * 2)) scale(1.15);
    opacity:0;
  }
}
@media (max-width:600px){
  .bubble-field{opacity:0.8;}
}

@media (max-width:1000px){
  .clean-index{grid-template-columns:repeat(3,1fr);gap:12px;}

  /* "실제 세척수" / "청소 완료" 박스를 모바일에서도 절대 세로로 쌓이지 않고
     메인 이미지 바로 아래 한 줄(2열)로, 두 박스(gap 포함)의 전체 가로 길이가
     메인 이미지 가로 길이와 정확히 일치하도록 유지 (PC와 동일한 50:50 flex 구조) */
  .hero-float-row{
    gap:14px;
    margin-top:20px;
  }
  .hero-visual{margin-top:36px;}
}
@media (max-width:600px){
  .hero{padding:120px 0 50px;}
  .hero-title{font-size:34px;}
  .hero-break-mobile{display:inline;}
  .hero-sub{font-size:15px;}
  .hero-float-row{gap:10px;margin-top:16px;}
  .clean-index-item{padding:18px 10px;}
  .ci-number{font-size:28px;}
  .ci-suffix{font-size:14px;}
}

/* ---------- PROBLEM ---------- */
.problem{background:var(--off-white);}
.dirty-grid{
  display:grid;
  grid-template-columns:repeat(4,1fr);
  gap:20px;
  margin-top:20px;
}
.dirty-card{
  border-radius:var(--radius-md);
  overflow:hidden;
  background:#fff;
  box-shadow:0 12px 26px -14px rgba(11,37,69,0.2);
  text-align:center;
}
.dirty-img{overflow:hidden;aspect-ratio:1/1;}
.dirty-img img{width:100%;height:100%;object-fit:cover;transition:transform .5s ease;}
.dirty-card:hover .dirty-img img{transform:scale(1.12);}
.dirty-card p{margin:0;padding:14px 8px;font-size:14px;font-weight:700;color:var(--gray-700);}
@media (max-width:768px){
  .dirty-grid{grid-template-columns:repeat(2,1fr);}
}

/* ---------- WHY SERO ---------- */
.why-sero{position:relative;overflow:hidden;}
.why-sero > .container{position:relative;z-index:1;}
.why-grid{
  display:grid;
  grid-template-columns:repeat(4,1fr);
  gap:24px;
}
.why-card{
  background:#fff;
  border-radius:var(--radius-lg);
  padding:28px 22px 32px;
  box-shadow:0 14px 32px -16px rgba(11,37,69,0.18);
  position:relative;
  transition:transform .3s ease, box-shadow .3s ease;
}
.why-card:hover{transform:translateY(-8px);box-shadow:0 24px 40px -16px rgba(11,37,69,0.28);}
.why-num{
  font-size:14px;
  font-weight:900;
  color:var(--air-blue);
  letter-spacing:0.1em;
}
.why-img{
  margin:14px 0 18px;
  border-radius:var(--radius-sm);
  overflow:hidden;
  aspect-ratio:4/3;
}
.why-img img{width:100%;height:100%;object-fit:cover;}
.why-card h3{font-size:17px;font-weight:800;margin:0 0 10px;color:var(--navy);}
.why-card p{font-size:14px;line-height:1.6;color:var(--gray-700);margin:0;}
@media (max-width:1000px){
  .why-grid{grid-template-columns:repeat(2,1fr);}
}
@media (max-width:600px){
  .why-grid{grid-template-columns:1fr;}
}

/* ---------- PROCESS TIMELINE ---------- */
.process{background:linear-gradient(180deg,#fff,#f4f9fd);}
.timeline{
  position:relative;
  max-width:900px;
  margin:0 auto;
  padding-left:40px;
  border-left:3px dashed var(--gray-300);
}
.timeline-step{
  position:relative;
  margin-bottom:56px;
  opacity:0.4;
  transform:translateX(10px);
  transition:opacity .5s ease, transform .5s ease;
}
.timeline-step.active{opacity:1;transform:translateX(0);}
.timeline-step:last-child{margin-bottom:0;}
.timeline-marker{
  position:absolute;
  left:-58px;
  top:0;
  width:40px;height:40px;
  border-radius:50%;
  background:var(--navy);
  color:#fff;
  display:flex;align-items:center;justify-content:center;
  font-weight:800;
  font-size:14px;
  box-shadow:0 8px 18px -6px rgba(11,37,69,0.4);
  transition:background .3s ease;
}
.timeline-step.active .timeline-marker{background:linear-gradient(135deg,var(--air-blue),var(--mint));}
.timeline-content{
  background:#fff;
  border-radius:var(--radius-md);
  padding:24px;
  display:flex;
  gap:22px;
  align-items:center;
  box-shadow:0 12px 26px -16px rgba(11,37,69,0.18);
}
.timeline-img{
  flex:0 0 180px;
  border-radius:var(--radius-sm);
  overflow:hidden;
  aspect-ratio:4/3;
}
.timeline-img img{width:100%;height:100%;object-fit:cover;}
.timeline-content h3{margin:0 0 8px;font-size:18px;font-weight:800;color:var(--navy);}
.timeline-content p{margin:0;font-size:14px;color:var(--gray-700);line-height:1.6;}
@media (max-width:700px){
  .timeline{padding-left:26px;}
  .timeline-marker{left:-40px;width:32px;height:32px;font-size:12px;}
  .timeline-content{flex-direction:column;padding:18px;}
  .timeline-img{flex:none;width:100%;}
}

/* ---------- BEFORE / AFTER (단일 대형 쇼케이스) ---------- */
.before-after{background:var(--off-white);position:relative;overflow:hidden;}
.before-after > .container{position:relative;z-index:1;}

/* 사례별로 BEFORE / AFTER 이미지를 화살표로 이어 양쪽 대칭 배치하는 정적 레이아웃 */
.ba-pairs{
  display:flex;
  flex-direction:column;
  gap:36px;
  max-width:1100px;
  margin:0 auto;
}
.ba-pair-name{
  text-align:center;
  font-size:17px;
  font-weight:800;
  color:var(--navy);
  margin:0 0 16px;
}
.ba-pair-row{
  display:grid;
  grid-template-columns:1fr auto 1fr;
  align-items:center;
  gap:20px;
}
.ba-pair-img{
  position:relative;
  border-radius:var(--radius-lg);
  overflow:hidden;
  box-shadow:var(--shadow-soft);
  aspect-ratio:4/3;
  background:var(--navy);
}
.ba-pair-img img{width:100%;height:100%;object-fit:cover;}
.ba-pair-badge{
  position:absolute;
  top:16px;left:16px;
  padding:7px 16px;
  border-radius:100px;
  font-size:12px;
  font-weight:800;
  letter-spacing:0.04em;
  color:#fff;
  z-index:2;
  box-shadow:0 8px 18px -8px rgba(0,0,0,0.35);
}
.ba-badge-before{background:rgba(15,32,51,0.8);border:1px solid rgba(255,255,255,0.25);}
.ba-badge-after{background:linear-gradient(135deg,var(--air-blue),var(--mint));}
.ba-pair-arrow{
  display:flex;
  align-items:center;
  justify-content:center;
  width:48px;height:48px;
  border-radius:50%;
  background:linear-gradient(135deg,var(--air-blue),var(--mint));
  color:#fff;
  font-size:18px;
  box-shadow:0 10px 24px -8px rgba(46,126,224,0.5);
  flex:none;
}

@media (max-width:700px){
  .ba-pairs{gap:28px;}
  .ba-pair-row{grid-template-columns:1fr;gap:10px;}
  .ba-pair-arrow{
    transform:rotate(90deg);
    width:40px;height:40px;
    font-size:15px;
    margin:0 auto;
  }
  .ba-pair-name{font-size:15px;}
}

/* ---------- DETAIL CLEAN ---------- */
.detail-clean{background:#fff;}
/* 왼쪽 큰 이미지(collage-big)는 그대로 유지하고, 오른쪽 3개는 단일 컬럼에 가로로 긴 박스로
   세로 정렬해 전체 높이가 왼쪽 큰 이미지와 정확히 맞도록 구성 */
.detail-collage{
  display:grid;
  grid-template-columns:1.4fr 1fr;
  column-gap:16px;
  row-gap:10px;
  align-items:stretch;
  margin-bottom:50px;
}
.collage-item{border-radius:var(--radius-md);overflow:hidden;aspect-ratio:16/9;}
/* 왼쪽 큰 이미지는 오른쪽 3개 박스(각 16:9)가 세로로 쌓인 전체 높이에 맞춰
   grid stretch로 정확히 동일한 높이를 갖도록 함 (크기/비율 자체는 변경 없음) */
.collage-big{grid-column:1;grid-row:1 / span 3;aspect-ratio:auto;height:100%;}
.collage-item img{width:100%;height:100%;object-fit:cover;transition:transform .5s ease;}
.collage-item:hover img{transform:scale(1.08);}
.detail-copy{
  text-align:center;
  font-size:19px;
  line-height:1.8;
  color:var(--navy);
  max-width:560px;
  margin:0 auto 40px;
}
.keyword-row{
  display:flex;
  justify-content:center;
  gap:18px;
  flex-wrap:wrap;
}
.keyword-item{
  font-size:15px;
  font-weight:800;
  letter-spacing:0.1em;
  color:var(--gray-300);
  padding:10px 22px;
  border:2px solid var(--gray-100);
  border-radius:100px;
  transition:color .4s ease, border-color .4s ease;
}
.keyword-item.active{color:var(--air-blue);border-color:var(--air-blue);}
@media (max-width:700px){
  .detail-collage{grid-template-columns:1fr 1fr;grid-template-rows:auto auto auto;}
  .collage-big{grid-column:span 2;grid-row:auto;aspect-ratio:16/9;}
  /* 모바일에서는 기존처럼 작은 이미지 3개를 정사각형(1:1) 타일로 유지 */
  .collage-item:not(.collage-big){aspect-ratio:1/1;}
}

/* ---------- SERVICE AREA ---------- */
.service-area{background:linear-gradient(180deg,#f4f9fd,#fff);position:relative;overflow:hidden;}
.service-area > .container{position:relative;z-index:1;}
.service-grid{
  display:grid;
  grid-template-columns:repeat(5,1fr);
  gap:18px;
}
.service-card{
  background:#fff;
  border-radius:var(--radius-md);
  padding:34px 16px;
  text-align:center;
  box-shadow:0 12px 26px -16px rgba(11,37,69,0.2);
  transition:transform .3s ease, box-shadow .3s ease;
}
.service-card:hover{transform:translateY(-6px);box-shadow:0 20px 36px -16px rgba(11,37,69,0.3);}
.service-card i{font-size:30px;color:var(--air-blue);margin-bottom:14px;}
.service-card h3{font-size:15px;font-weight:700;margin:0;color:var(--navy);}
.service-cta{text-align:center;margin-top:46px;}
@media (max-width:900px){
  .service-grid{grid-template-columns:repeat(3,1fr);}
}
@media (max-width:600px){
  .service-grid{grid-template-columns:repeat(2,1fr);}
}

/* ---------- TRUST ---------- */
.trust{background:#fff;}
.trust-table-wrap{overflow-x:auto;margin-bottom:46px;}
.trust-table{
  width:100%;
  border-collapse:collapse;
  min-width:520px;
  background:#fff;
  border-radius:var(--radius-md);
  overflow:hidden;
  box-shadow:0 14px 30px -18px rgba(11,37,69,0.2);
}
.trust-table th,.trust-table td{
  padding:18px 20px;
  text-align:center;
  font-size:15px;
  border-bottom:1px solid var(--gray-100);
}
.trust-table thead th{
  background:var(--navy);
  color:#fff;
  font-weight:800;
}
.trust-table tbody td:first-child{
  text-align:left;
  font-weight:700;
  color:var(--navy);
}
.trust-table td i{font-size:16px;color:var(--gray-300);}
.trust-table td i.accent{color:var(--mint);}
.trust-table tbody tr:last-child td{border-bottom:none;}
.trust-quote{text-align:center;font-size:19px;line-height:1.8;color:var(--navy);}
.trust-quote strong{color:var(--air-blue);}

/* ---------- FINAL CTA ---------- */
.final-cta{
  position:relative;
  min-height:520px;
  display:flex;
  align-items:center;
  justify-content:center;
  overflow:hidden;
}
.final-cta-bg{position:absolute;inset:0;}
.final-cta-bg img{width:100%;height:100%;object-fit:cover;}
.final-cta-overlay{
  position:absolute;inset:0;
  background:linear-gradient(180deg, rgba(8,25,47,0.75), rgba(8,25,47,0.9));
}
.final-cta-content{
  position:relative;
  z-index:2;
  text-align:center;
  color:#fff;
  padding:80px 24px;
  max-width:760px;
}
.final-cta-content h2{
  font-size:36px;
  font-weight:900;
  line-height:1.4;
  margin:0 0 20px;
}
.final-cta-content p{
  font-size:17px;
  line-height:1.7;
  color:rgba(255,255,255,0.85);
  margin:0 0 36px;
}
.final-cta-buttons{display:flex;gap:16px;justify-content:center;flex-wrap:wrap;}
@media (max-width:600px){
  .final-cta-content h2{font-size:26px;}
}

/* ---------- CONTACT FORM ---------- */
.contact{background:var(--off-white);}
.contact-form{
  max-width:640px;
  margin:0 auto;
  background:#fff;
  border-radius:var(--radius-lg);
  padding:40px;
  box-shadow:0 20px 50px -24px rgba(11,37,69,0.25);
}
.form-row{margin-bottom:20px;}
.form-row-half{display:grid;grid-template-columns:1fr 1fr;gap:16px;}
.form-row label{
  display:block;
  font-size:14px;
  font-weight:700;
  color:var(--navy);
  margin-bottom:8px;
}
.req{color:#e5484d;}
.form-row input,.form-row select,.form-row textarea{
  width:100%;
  padding:13px 16px;
  border:1.5px solid var(--gray-100);
  border-radius:var(--radius-sm);
  font-size:15px;
  font-family:var(--font);
  color:var(--text-dark);
  background:#fbfdff;
  transition:border-color .2s, box-shadow .2s;
}
.form-row input:focus,.form-row select:focus,.form-row textarea:focus{
  outline:none;
  border-color:var(--air-blue);
  box-shadow:0 0 0 3px rgba(46,126,224,0.15);
}
.form-row textarea{resize:vertical;}
.form-checkbox{display:flex;align-items:center;}
.checkbox-label{
  display:flex;
  align-items:center;
  gap:10px;
  font-size:14px;
  color:var(--gray-700);
  cursor:pointer;
}
.checkbox-label input{width:18px;height:18px;flex:none;}
.form-error{
  color:#e5484d;
  font-size:13px;
  font-weight:600;
  margin:-8px 0 16px;
  min-height:18px;
}
@media (max-width:600px){
  .contact-form{padding:26px 20px;}
  .form-row-half{grid-template-columns:1fr;}
}

/* ---------- FOOTER ---------- */
.site-footer{background:var(--deep-navy);color:rgba(255,255,255,0.7);padding:56px 0 30px;}
.footer-inner{text-align:center;}
.footer-logo{font-size:22px;font-weight:900;color:#fff;margin:0 0 6px;}
.footer-logo span{color:var(--sky);font-weight:700;font-size:15px;margin-left:4px;}
.footer-brand p{margin:0;font-size:13px;}
.footer-info{margin:20px 0;font-size:13px;line-height:1.8;}
.footer-links{display:flex;justify-content:center;gap:24px;margin-bottom:24px;font-size:13px;}
.footer-links a:hover{color:#fff;}
.footer-bottom{
  border-top:1px solid rgba(255,255,255,0.12);
  padding-top:22px;
  display:flex;
  align-items:center;
  justify-content:center;
  gap:16px;
  font-size:12px;
  position:relative;
}
.admin-key{
  color:rgba(255,255,255,0.35);
  font-size:14px;
  transition:color .2s;
  position:absolute;
  right:0;
}
.admin-key:hover{color:rgba(255,255,255,0.8);}
@media (max-width:600px){
  .footer-bottom{flex-direction:column;gap:10px;}
  .admin-key{position:static;}
}

/* ---------- MOBILE STICKY CTA ---------- */
.mobile-cta-bar{
  display:none;
  position:fixed;
  bottom:0;left:0;right:0;
  z-index:400;
  background:#fff;
  box-shadow:0 -8px 24px -6px rgba(11,37,69,0.2);
  padding:10px 14px;
  padding-bottom:calc(10px + env(safe-area-inset-bottom));
  gap:10px;
}
.mobile-cta-btn{
  flex:1;
  display:flex;
  align-items:center;
  justify-content:center;
  gap:8px;
  padding:14px 0;
  border-radius:100px;
  font-weight:800;
  font-size:15px;
}
.mobile-cta-call{background:var(--navy);color:#fff;}
.mobile-cta-msg{background:linear-gradient(135deg,var(--air-blue),var(--mint));color:#fff;}
@media (max-width:900px){
  .mobile-cta-bar{display:flex;}
  body{padding-bottom:76px;}
}

/* ---------- DESKTOP FLOATING CTA ---------- */
.floating-cta{
  position:fixed;
  bottom:36px;right:36px;
  width:60px;height:60px;
  border-radius:50%;
  background:linear-gradient(135deg,var(--air-blue),var(--mint));
  color:#fff;
  display:flex;align-items:center;justify-content:center;
  font-size:24px;
  box-shadow:0 16px 32px -10px rgba(46,126,224,0.55);
  z-index:400;
  transition:transform .25s ease;
}
.floating-cta:hover{transform:scale(1.08);}
@media (max-width:900px){
  .floating-cta{display:none;}
}

/* ---------- TOAST / POPUP ---------- */
.toast-overlay{
  position:fixed;
  inset:0;
  background:rgba(8,25,47,0.55);
  display:none;
  align-items:center;
  justify-content:center;
  z-index:900;
  padding:20px;
}
.toast-overlay.show{display:flex;}
.toast-box{
  background:#fff;
  border-radius:var(--radius-lg);
  padding:44px 36px;
  text-align:center;
  max-width:360px;
  box-shadow:0 30px 60px -20px rgba(0,0,0,0.4);
  animation:popIn .3s ease;
}
@keyframes popIn{from{opacity:0;transform:scale(0.9);}to{opacity:1;transform:scale(1);}}
.toast-box i{font-size:44px;color:var(--mint);margin-bottom:16px;}
.toast-box h3{font-size:18px;margin:0 0 10px;color:var(--navy);}
.toast-box p{font-size:14px;color:var(--gray-700);margin:0 0 26px;}

/* ---------- Preloader (3s splash) ---------- */
body.is-loading{overflow:hidden;}
.preloader{
  position:fixed;
  inset:0;
  z-index:2000;
  display:flex;
  align-items:center;
  justify-content:center;
  background:linear-gradient(160deg, var(--deep-navy) 0%, var(--navy) 55%, #123a63 100%);
  transition:opacity .6s ease, visibility .6s ease;
}
.preloader.preloader-hide{
  opacity:0;
  visibility:hidden;
  pointer-events:none;
}
.preloader-inner{
  text-align:center;
  color:#fff;
  padding:0 24px;
}
.preloader-logo{
  font-size:34px;
  font-weight:900;
  letter-spacing:0.04em;
  margin:0 0 22px;
  animation:preloaderPulse 1.6s ease-in-out infinite;
}
.preloader-logo span{
  display:block;
  font-size:14px;
  font-weight:700;
  letter-spacing:0.3em;
  color:var(--sky);
  margin-top:6px;
}
@keyframes preloaderPulse{
  0%,100%{opacity:1;transform:scale(1);}
  50%{opacity:0.75;transform:scale(0.97);}
}
.preloader-bar{
  width:220px;
  height:4px;
  border-radius:100px;
  background:rgba(255,255,255,0.15);
  overflow:hidden;
  margin:0 auto;
}
.preloader-bar-fill{
  width:0%;
  height:100%;
  border-radius:100px;
  background:linear-gradient(135deg, var(--air-blue), var(--mint));
  transition:width 3s linear;
}
.preloader-caption{
  margin:18px 0 0;
  font-size:13px;
  letter-spacing:0.05em;
  color:rgba(255,255,255,0.6);
}

/* =========================================================
   모바일 전용 반응형 최적화
   (PC/데스크톱 레이아웃은 위 규칙 그대로 유지되며, 아래는 모바일 폭에서만 적용됨)
   ========================================================= */

/* ---------- 공통 유틸 ---------- */
.mobile-break{display:none;}
@media (max-width:600px){
  .mobile-break{display:inline;}
}

/* 가로 스크롤 방지 (모바일 전 구간 공통 안전장치) */
@media (max-width:900px){
  html,body{max-width:100%;overflow-x:hidden;}
}

/* 한글 의미 단위 줄바꿈 + 과도한 긴 단어로 인한 가로 넘침 방지 (모바일 전용) */
@media (max-width:768px){
  h1,h2,h3,p,span,a,label,.btn{
    word-break:keep-all;
    overflow-wrap:break-word;
  }
  img,table,.container,.section,.hero-container{max-width:100%;}
}

/* ---------- 헤더 (좁은 화면에서 버튼/로고 겹침, 넘침 방지) ---------- */
@media (max-width:480px){
  .header-inner{padding:0 16px;gap:8px;}
  .logo{font-size:18px;}
  .logo span{font-size:13px;}
  .header-actions{gap:8px;}
  .btn-call-header{padding:9px 14px;}
  .btn-call-header i{font-size:15px;}
  .btn-admin-header{width:34px;height:34px;font-size:13px;}
  .nav-toggle{font-size:20px;}
}

/* ---------- 섹션 공통 (좁은 화면에서 제목/본문 가독성 보강) ---------- */
@media (max-width:480px){
  .section{padding:52px 0;}
  .container{padding:0 20px;}
  .section-kicker{font-size:12px;margin-bottom:12px;}
  .section-title{font-size:23px;line-height:1.4;margin-bottom:16px;}
  .section-desc{font-size:14px;line-height:1.7;margin-bottom:34px;}
}

/* ---------- HERO (CTA 버튼 터치 영역 확보) ---------- */
@media (max-width:600px){
  .hero-cta{flex-direction:column;align-items:stretch;gap:12px;}
  .hero-cta .btn{width:100%;}
}
@media (max-width:480px){
  .hero-kicker{font-size:11px;letter-spacing:0.18em;}
  .hero-title{font-size:27px;margin-bottom:18px;}
  .hero-sub{font-size:14px;line-height:1.7;margin-bottom:28px;}
  .clean-index{margin-top:40px;gap:8px;}
  .clean-index-item{padding:14px 6px;}
  .ci-number{font-size:22px;}
  .ci-suffix{font-size:12px;}
  .clean-index-item p{font-size:11px;line-height:1.4;}
  .float-tag{font-size:11px;padding:5px 0;}
}

/* ---------- PROBLEM (오염 카드 2열 유지, 좁은 화면 여백만 축소) ---------- */
@media (max-width:480px){
  .dirty-grid{gap:12px;}
  .dirty-card p{font-size:12.5px;padding:12px 6px;}
}

/* ---------- WHY SERO (카드 세로 배열은 600px에서 이미 적용, 내부 여백만 보강) ---------- */
@media (max-width:600px){
  .why-card{padding:24px 20px 28px;}
  .why-card h3{font-size:16px;}
  .why-card p{font-size:13.5px;}
}

/* ---------- PROCESS TIMELINE (좁은 화면 여백/글자 크기 보강) ---------- */
@media (max-width:480px){
  .timeline-step{margin-bottom:40px;}
  .timeline-content{padding:16px;gap:0;}
  .timeline-content h3{font-size:16px;}
  .timeline-content p{font-size:13px;}
}

/* ---------- BEFORE & AFTER (케이스명 길어도 잘리지 않도록) ---------- */
@media (max-width:480px){
  .ba-case-title-bar{padding:12px 14px;}
  .ba-case-name{font-size:12.5px;white-space:normal;line-height:1.3;}
  .ba-case-index{font-size:10px;padding:3px 8px;}
}

/* ---------- DETAIL (본문 줄바꿈/글자 크기 보강) ---------- */
@media (max-width:600px){
  .detail-copy{font-size:16px;line-height:1.7;}
  .keyword-row{gap:10px;}
  .keyword-item{font-size:12px;padding:8px 14px;}
}

/* ---------- SERVICE AREA (카드 내용이 많아져 1열이 가장 읽기 편함) ---------- */
@media (max-width:600px){
  .service-grid{grid-template-columns:1fr;gap:14px;}
  .service-card{padding:24px 22px;text-align:left;display:flex;flex-direction:column;align-items:flex-start;}
  .service-card i{font-size:26px;margin-bottom:10px;}
  .service-card h3{font-size:16px;line-height:1.4;}
  .service-card p{margin:8px 0 0;font-size:13px;line-height:1.6;color:var(--gray-700);}
  .service-cta{margin-top:30px;}
  .service-cta .btn{width:100%;}
}

/* ---------- TRUST (모바일에서는 표 대신 카드형 비교로 전환) ---------- */
.trust-mobile-cards{display:none;}
@media (max-width:700px){
  .trust-table-wrap{display:none;}
  .trust-mobile-cards{
    display:block;
    margin-bottom:34px;
  }
  .trust-card{
    background:#fff;
    border-radius:var(--radius-md);
    padding:16px 18px;
    margin-bottom:12px;
    box-shadow:0 10px 24px -16px rgba(11,37,69,0.22);
  }
  .trust-card-title{
    margin:0 0 12px;
    font-size:14.5px;
    font-weight:800;
    color:var(--navy);
  }
  .trust-card-row{
    display:grid;
    grid-template-columns:1fr 1fr;
    gap:10px;
  }
  .trust-card-col{
    display:flex;
    flex-direction:column;
    align-items:center;
    justify-content:center;
    gap:6px;
    border-radius:var(--radius-sm);
    padding:12px 8px;
    text-align:center;
  }
  .trust-card-col-basic{
    background:var(--gray-100);
  }
  .trust-card-col-sero{
    background:linear-gradient(135deg, var(--navy), var(--air-blue));
  }
  .trust-card-label{
    font-size:11.5px;
    font-weight:700;
    color:var(--gray-500);
  }
  .trust-card-col-sero .trust-card-label{color:rgba(255,255,255,0.85);}
  .trust-card-col i{font-size:16px;color:var(--gray-300);}
  .trust-card-col i.accent{color:var(--mint);}
  .trust-card-col-sero i.accent{color:#fff;}
  .trust-card-triangle{font-size:15px;font-weight:800;color:var(--gray-500);}
  .trust-mobile-note{
    text-align:center;
    font-size:12px;
    color:var(--gray-500);
    margin:6px 0 0;
  }
}
@media (max-width:600px){
  .trust-quote{font-size:16px;line-height:1.7;}
}

/* ---------- FINAL CTA (버튼 전체폭 + 눈에 띄는 터치 영역) ---------- */
@media (max-width:600px){
  .final-cta-content{padding:60px 22px;}
  .final-cta-content h2{font-size:23px;line-height:1.4;}
  .final-cta-content p{font-size:14.5px;line-height:1.7;}
  .final-cta-buttons{flex-direction:column;align-items:stretch;gap:12px;}
  .final-cta-buttons .btn{width:100%;}
}

/* ---------- CONTACT FORM (좁은 화면 입력 영역 보강) ---------- */
@media (max-width:480px){
  .contact-form{padding:22px 16px;}
  .form-row label{font-size:13px;}
  /* font-size 16px 미만이면 iOS Safari에서 입력창 포커스 시 자동 확대가 발생하므로 16px로 고정 */
  .form-row input,.form-row select,.form-row textarea{padding:11px 14px;font-size:16px;}
}

/* ---------- Scroll Reveal ---------- */
[data-reveal]{
  opacity:0;
  transform:translateY(28px);
  transition:opacity .7s ease, transform .7s ease;
}
[data-reveal].revealed{
  opacity:1;
  transform:translateY(0);
}