/* ================================================
   ATECH GROUP KOREA — style.css v4
   Clean, modern, fully responsive
   ================================================ */

:root {
  --navy:    #050d1a;
  --dark:    #0a1628;
  --blue:    #0056d2;
  --cyan:    #00c8e0;
  --orange:  #ff6b35;
  --white:   #ffffff;
  --gray:    #94a3b8;
  --light:   #f1f5f9;
  --card-bg: #0f1e35;
  --radius:  12px;
  --shadow:  0 4px 24px rgba(0,0,0,.3);
  --trans:   0.3s ease;
}

*, *::before, *::after { box-sizing:border-box; margin:0; padding:0; }

html { scroll-behavior:smooth; }

body {
  font-family: 'Inter','Noto Sans KR', sans-serif;
  background: var(--navy);
  color: var(--white);
  line-height: 1.7;
  overflow-x: hidden;
}

img { display:block; width:100%; height:100%; object-fit:cover; }

a { color:var(--cyan); text-decoration:none; }

.container { max-width:1200px; margin:0 auto; padding:0 24px; }

section { padding: 90px 0; }

/* ── SECTION HEADER ── */
.section-header { text-align:center; margin-bottom:60px; }
.section-label {
  display:inline-block;
  font-size:.75rem; font-weight:700; letter-spacing:.15em;
  text-transform:uppercase; color:var(--cyan);
  border:1px solid var(--cyan); border-radius:20px;
  padding:4px 14px; margin-bottom:16px;
}
.section-label.light { color:rgba(255,255,255,.8); border-color:rgba(255,255,255,.4); }
.section-header h2 { font-size:clamp(1.8rem,3.5vw,2.8rem); line-height:1.25; }

/* ── BUTTONS ── */
.btn-primary {
  display:inline-block; padding:14px 32px;
  background:var(--blue); color:#fff;
  border-radius:8px; font-weight:700; font-size:.95rem;
  transition:background var(--trans), transform var(--trans);
}
.btn-primary:hover { background:#0046b8; transform:translateY(-2px); }
.btn-primary.full { width:100%; text-align:center; cursor:pointer; border:none; font-size:1rem; }

.btn-outline {
  display:inline-block; padding:14px 32px;
  border:2px solid rgba(255,255,255,.6); color:#fff;
  border-radius:8px; font-weight:700; font-size:.95rem;
  transition:all var(--trans);
}
.btn-outline:hover { border-color:#fff; background:rgba(255,255,255,.1); }

/* ── HEADER ── */
#header {
  position:fixed; top:0; left:0; right:0; z-index:1000;
  transition:background var(--trans), box-shadow var(--trans);
}
#header.scrolled {
  background:rgba(5,13,26,.95);
  backdrop-filter:blur(12px);
  box-shadow:0 2px 20px rgba(0,0,0,.4);
}
.header-inner {
  max-width:1200px; margin:0 auto;
  display:flex; align-items:center; justify-content:space-between;
  padding:0 24px; height:70px;
}
.logo-link { display:flex; align-items:center; gap:10px; }
.logo-img { height:46px; width:auto; object-fit:contain; }

.nav-menu { display:flex; align-items:center; gap:4px; }
.nav-menu a {
  padding:8px 14px; border-radius:6px;
  font-size:.9rem; font-weight:500; color:rgba(255,255,255,.85);
  transition:all var(--trans);
}
.nav-menu a:hover, .nav-menu a.active { color:#fff; background:rgba(255,255,255,.1); }
.nav-menu a.nav-cta {
  background:var(--blue); color:#fff;
  padding:9px 20px; border-radius:8px; font-weight:700;
  margin-left:8px;
}
.nav-menu a.nav-cta:hover { background:#0046b8; }

.header-right { display:flex; align-items:center; gap:12px; }

/* Language Switcher */
.lang-switcher { display:flex; gap:4px; background:rgba(255,255,255,.08); border-radius:8px; padding:4px; }
.lang-btn {
  padding:5px 12px; border:none; border-radius:6px;
  background:transparent; color:rgba(255,255,255,.7);
  font-size:.8rem; font-weight:700; cursor:pointer; transition:all var(--trans);
}
.lang-btn.active { background:var(--blue); color:#fff; }
.lang-btn:hover:not(.active) { color:#fff; background:rgba(255,255,255,.12); }

/* Hamburger */
.hamburger { display:none; flex-direction:column; gap:5px; background:none; border:none; cursor:pointer; padding:6px; }
.hamburger span { display:block; width:24px; height:2px; background:#fff; border-radius:2px; transition:all var(--trans); }
.hamburger.open span:nth-child(1) { transform:rotate(45deg) translate(5px,5px); }
.hamburger.open span:nth-child(2) { opacity:0; }
.hamburger.open span:nth-child(3) { transform:rotate(-45deg) translate(5px,-5px); }

/* ── HERO ── */
#hero {
  position:relative; height:100vh; min-height:680px;
  display:flex; align-items:center; overflow:hidden;
}
.hero-bg {
  position:absolute; inset:0;
  background-size:cover; background-position:center;
  transform:scale(1.05);
  transition:transform 8s ease;
}
#hero:hover .hero-bg { transform:scale(1); }
.hero-overlay { position:absolute; inset:0; background:linear-gradient(135deg,rgba(5,13,26,.85) 40%,rgba(0,86,210,.25)); }
.hero-content {
  position:relative; z-index:2;
  max-width:1200px; margin:0 auto; padding:0 24px;
}
.hero-badge {
  display:inline-block;
  font-size:.7rem; font-weight:700; letter-spacing:.15em;
  color:var(--cyan); border:1px solid var(--cyan);
  border-radius:20px; padding:5px 14px; margin-bottom:20px;
}
.hero-content h1 {
  font-family:'Orbitron',sans-serif;
  font-size:clamp(2rem,5vw,4rem);
  font-weight:900; line-height:1.15;
  margin-bottom:16px;
  text-shadow:0 2px 20px rgba(0,0,0,.5);
}
.hero-content h1 em { color:var(--cyan); font-style:normal; }
.hero-sub { font-size:clamp(1rem,2vw,1.3rem); color:rgba(255,255,255,.75); margin-bottom:20px; }
.hero-ko {
  font-size:clamp(1.4rem,3vw,2.2rem); font-weight:700;
  color:var(--white); margin-bottom:12px;
}
.hero-desc { font-size:1rem; color:rgba(255,255,255,.65); max-width:560px; margin-bottom:36px; }
.hero-btns { display:flex; gap:14px; flex-wrap:wrap; }
.scroll-hint {
  position:absolute; bottom:32px; left:50%; transform:translateX(-50%);
  display:flex; flex-direction:column; align-items:center; z-index:2;
}
.scroll-hint span {
  width:2px; height:48px;
  background:linear-gradient(to bottom, rgba(255,255,255,0), rgba(255,255,255,.6));
  animation:scrollPulse 1.6s ease-in-out infinite;
}
@keyframes scrollPulse { 0%,100%{opacity:0;transform:scaleY(.5)} 50%{opacity:1;transform:scaleY(1)} }

/* ── STATS ── */
#stats { padding:0; background:linear-gradient(90deg,var(--blue),#0036a0); }
.stats-row {
  max-width:1200px; margin:0 auto; padding:0 24px;
  display:flex; align-items:stretch; flex-wrap:wrap;
}
.stat-item {
  flex:1; min-width:120px;
  padding:28px 20px; text-align:center;
}
.stat-item b {
  display:block; font-family:'Orbitron',sans-serif;
  font-size:clamp(2rem,4vw,3rem); font-weight:900; color:#fff;
}
.stat-item b + span { font-size:1.5rem; font-weight:700; color:var(--cyan); }
.stat-item p { font-size:.8rem; color:rgba(255,255,255,.75); margin-top:4px; }
.stat-div { width:1px; background:rgba(255,255,255,.2); margin:16px 0; }

/* ── ABOUT ── */
#about { background:var(--dark); }
.about-grid {
  display:grid; grid-template-columns:1fr 1fr; gap:60px; align-items:center;
}
.about-img { position:relative; border-radius:var(--radius); overflow:hidden; }
.about-img img { border-radius:var(--radius); height:460px; }
.about-img-caption {
  position:absolute; bottom:0; left:0; right:0;
  background:linear-gradient(to top, rgba(5,13,26,.9), transparent);
  padding:24px 20px 16px;
  font-size:.82rem; color:rgba(255,255,255,.8);
}
.about-text h2 { font-size:clamp(1.6rem,3vw,2.4rem); margin-bottom:20px; line-height:1.25; }
.about-text p { color:var(--gray); margin-bottom:16px; font-size:.97rem; }
.badges { display:flex; flex-wrap:wrap; gap:8px; margin:20px 0; }
.badge {
  padding:7px 14px; border-radius:20px;
  background:rgba(0,200,224,.1); border:1px solid rgba(0,200,224,.3);
  color:var(--cyan); font-size:.8rem; font-weight:600;
}
blockquote {
  border-left:3px solid var(--cyan);
  padding:16px 20px; margin-top:24px;
  background:rgba(0,86,210,.1); border-radius:0 8px 8px 0;
  font-size:.9rem; color:rgba(255,255,255,.8); font-style:italic;
}
blockquote cite { display:block; margin-top:10px; font-size:.82rem; color:var(--cyan); font-style:normal; }

/* ── WHY ATGK ── */
#why { background:var(--navy); }
.why-grid { display:grid; grid-template-columns:repeat(4,1fr); gap:24px; }
.why-card {
  background:var(--card-bg); border-radius:var(--radius);
  overflow:hidden; border:1px solid rgba(255,255,255,.06);
  transition:transform var(--trans), box-shadow var(--trans);
}
.why-card:hover { transform:translateY(-6px); box-shadow:var(--shadow); }
.why-icon { font-size:2rem; padding:24px 24px 0; }
.why-card h3 { padding:12px 24px 8px; font-size:1.05rem; }
.why-card p { padding:0 24px 20px; font-size:.875rem; color:var(--gray); line-height:1.6; }
.why-card img { height:180px; width:100%; object-fit:cover; }

/* ── IMPACT ── */
#impact { background:var(--dark); }
.impact-grid { display:grid; grid-template-columns:repeat(4,1fr); gap:24px; }
.impact-card {
  position:relative; border-radius:var(--radius); overflow:hidden;
  height:280px; background-size:cover; background-position:center;
  cursor:pointer;
  transition:transform var(--trans);
}
.impact-card:hover { transform:scale(1.02); }
.impact-overlay { position:absolute; inset:0; background:linear-gradient(to top, rgba(5,13,26,.92) 50%, rgba(5,13,26,.3)); }
.impact-content { position:absolute; bottom:0; left:0; right:0; padding:24px; z-index:2; }
.impact-icon { font-size:1.5rem; margin-bottom:8px; }
.impact-content h3 { font-size:1rem; font-weight:700; margin-bottom:4px; }
.impact-num { font-size:1.4rem; font-weight:900; color:var(--cyan); font-family:'Orbitron',sans-serif; margin-bottom:6px; }
.impact-content p { font-size:.82rem; color:rgba(255,255,255,.7); }

/* ── SERVICES ── */
#services { background:var(--navy); }
.svc-grid { display:grid; grid-template-columns:repeat(3,1fr); gap:28px; }
.svc-card {
  background:var(--card-bg); border-radius:var(--radius);
  overflow:hidden; border:1px solid rgba(255,255,255,.06);
  transition:transform var(--trans), box-shadow var(--trans);
}
.svc-card:hover { transform:translateY(-6px); box-shadow:var(--shadow); }
.svc-img-wrap { height:200px; overflow:hidden; }
.svc-img-wrap img { height:200px; object-fit:cover; transition:transform .4s ease; }
.svc-card:hover .svc-img-wrap img { transform:scale(1.05); }
.svc-body { padding:24px; }
.svc-icon { font-size:1.8rem; margin-bottom:10px; }
.svc-body h3 { font-size:1rem; font-weight:700; margin-bottom:6px; }
.svc-tag { color:var(--cyan); font-size:.82rem; font-style:italic; margin-bottom:8px; }
.svc-body > p:last-child { font-size:.875rem; color:var(--gray); }

/* ── GALLERY ── */
#gallery { background:var(--dark); }
.gallery-grid {
  display:grid;
  grid-template-columns:repeat(4,1fr);
  gap:12px;
}
.gal-item {
  position:relative; border-radius:8px; overflow:hidden;
  cursor:pointer;
  aspect-ratio:4/3;
}
.gal-item:nth-child(1),
.gal-item:nth-child(7) { grid-column:span 2; }
.gal-item img { width:100%; height:100%; object-fit:cover; transition:transform .4s ease; }
.gal-item:hover img { transform:scale(1.06); }
.gal-cap {
  position:absolute; bottom:0; left:0; right:0;
  background:linear-gradient(to top, rgba(5,13,26,.9), transparent);
  padding:24px 12px 10px; font-size:.78rem; color:rgba(255,255,255,.85);
  transform:translateY(4px); transition:transform var(--trans);
}
.gal-item:hover .gal-cap { transform:translateY(0); }

/* ── PARTNERS ── */
#partners { background:var(--navy); }
.ptn-grid { display:grid; grid-template-columns:repeat(3,1fr); gap:24px; margin-bottom:40px; }
.ptn-card {
  background:var(--card-bg); border-radius:var(--radius); padding:32px 24px;
  text-align:center; border:1px solid rgba(255,255,255,.06);
  transition:transform var(--trans);
}
.ptn-card:hover { transform:translateY(-4px); }
.ptn-icon { font-size:2.5rem; margin-bottom:14px; }
.ptn-card h4 { font-size:1rem; margin-bottom:8px; }
.ptn-card p { font-size:.85rem; color:var(--gray); }

.expo-banner {
  background:linear-gradient(135deg,var(--blue),#003580);
  border-radius:var(--radius); padding:36px 40px;
}
.expo-inner { display:flex; align-items:center; gap:28px; flex-wrap:wrap; }
.expo-year {
  font-family:'Orbitron',sans-serif; font-size:3.5rem;
  font-weight:900; color:rgba(255,255,255,.15); min-width:100px;
}
.expo-inner h3 { font-size:1.4rem; margin-bottom:6px; }
.expo-inner p { color:rgba(255,255,255,.75); font-size:.9rem; }
.expo-inner .btn-primary { margin-left:auto; white-space:nowrap; }

/* ── CONTACT ── */
#contact { position:relative; padding:100px 0; }
.contact-bg { position:absolute; inset:0; background-size:cover; background-position:center; }
.contact-overlay { position:absolute; inset:0; background:rgba(5,13,26,.88); }
#contact .container { position:relative; z-index:2; }
.contact-grid { display:grid; grid-template-columns:1fr 1.2fr; gap:60px; }
.contact-info h2 { font-size:clamp(1.5rem,3vw,2.2rem); margin:16px 0 12px; }
.contact-info > p { color:rgba(255,255,255,.7); margin-bottom:32px; }
.contact-details { display:flex; flex-direction:column; gap:16px; }
.ci { display:flex; gap:14px; align-items:flex-start; }
.ci span { font-size:1.2rem; margin-top:2px; flex-shrink:0; }
.ci div { font-size:.9rem; color:rgba(255,255,255,.8); }
.ci a { color:var(--cyan); }

.contact-form { background:rgba(15,30,53,.85); backdrop-filter:blur(10px); border:1px solid rgba(255,255,255,.1); border-radius:var(--radius); padding:36px 32px; }
.contact-form h3 { margin-bottom:24px; font-size:1.2rem; }
.form-row { display:grid; grid-template-columns:1fr 1fr; gap:16px; }
.form-group { margin-bottom:16px; }
.form-group label { display:block; font-size:.82rem; color:var(--gray); margin-bottom:6px; font-weight:600; }
.form-group input,
.form-group select,
.form-group textarea {
  width:100%; padding:11px 14px;
  background:rgba(255,255,255,.06); border:1px solid rgba(255,255,255,.12);
  border-radius:8px; color:#fff; font-size:.9rem;
  transition:border var(--trans);
  font-family:inherit;
}
.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  outline:none; border-color:var(--cyan);
  background:rgba(0,200,224,.05);
}
.form-group select option { background:var(--dark); }
#formSuccess {
  background:rgba(0,200,100,.15); border:1px solid rgba(0,200,100,.4);
  border-radius:8px; padding:12px 16px; margin-top:12px;
  font-size:.9rem; color:#4ade80;
}

/* ── FOOTER ── */
#footer { background:#020912; padding:60px 0 0; }
.footer-inner {
  max-width:1200px; margin:0 auto; padding:0 24px 48px;
  display:grid; grid-template-columns:2fr 1fr 1.5fr 1fr; gap:40px;
}
.footer-logo { height:56px; width:auto; object-fit:contain; margin-bottom:12px; }
.footer-name { font-size:1rem; font-weight:700; margin-bottom:6px; }
.footer-tag { font-size:.82rem; color:var(--gray); line-height:1.6; margin-bottom:4px; }
.footer-en { font-size:.78rem; color:var(--cyan); }
.footer-links h5, .footer-contact h5, .footer-certs h5 {
  font-size:.8rem; text-transform:uppercase; letter-spacing:.1em;
  color:var(--gray); margin-bottom:14px;
}
.footer-links a { display:block; font-size:.87rem; color:rgba(255,255,255,.65); padding:4px 0; transition:color var(--trans); }
.footer-links a:hover { color:var(--cyan); }
.footer-contact p { font-size:.82rem; color:rgba(255,255,255,.6); margin-bottom:6px; }
.footer-contact a { color:var(--cyan); }
.cert {
  display:inline-block; padding:6px 12px; margin:4px 0;
  background:rgba(0,200,224,.08); border:1px solid rgba(0,200,224,.2);
  border-radius:6px; font-size:.78rem; color:var(--cyan);
}
.footer-bottom {
  border-top:1px solid rgba(255,255,255,.07);
  padding:20px 24px; max-width:1200px; margin:0 auto;
  display:flex; justify-content:space-between; flex-wrap:wrap; gap:8px;
}
.footer-bottom p { font-size:.78rem; color:rgba(255,255,255,.35); }

/* ── LIGHTBOX ── */
.lightbox {
  position:fixed; inset:0; z-index:9999;
  background:rgba(0,0,0,.92); display:flex; align-items:center; justify-content:center;
  opacity:0; pointer-events:none; transition:opacity .3s;
}
.lightbox.open { opacity:1; pointer-events:all; }
.lb-content { text-align:center; max-width:90vw; max-height:90vh; }
.lb-content img { max-width:90vw; max-height:80vh; object-fit:contain; border-radius:8px; }
#lbCap { margin-top:12px; font-size:.9rem; color:rgba(255,255,255,.75); }
.lb-close { position:fixed; top:20px; right:20px; background:rgba(255,255,255,.15); border:none; color:#fff; width:40px; height:40px; border-radius:50%; font-size:1.2rem; cursor:pointer; }
.lb-prev, .lb-next { position:fixed; top:50%; transform:translateY(-50%); background:rgba(255,255,255,.15); border:none; color:#fff; width:48px; height:48px; border-radius:50%; font-size:1.8rem; cursor:pointer; transition:background var(--trans); }
.lb-prev { left:16px; } .lb-next { right:16px; }
.lb-prev:hover, .lb-next:hover, .lb-close:hover { background:rgba(255,255,255,.3); }

/* ── BACK TO TOP ── */
.back-top {
  position:fixed; bottom:28px; right:28px; z-index:900;
  width:44px; height:44px; background:var(--blue); color:#fff;
  border:none; border-radius:50%; font-size:1.2rem; cursor:pointer;
  opacity:0; transform:translateY(20px); transition:all var(--trans);
  box-shadow:0 4px 16px rgba(0,86,210,.4);
}
.back-top.show { opacity:1; transform:translateY(0); }
.back-top:hover { background:#0046b8; transform:translateY(-3px); }

/* ── REVEAL ANIMATION ── */
.reveal, .reveal-right {
  opacity:0; transform:translateY(36px); transition:opacity .6s ease, transform .6s ease;
}
.reveal-right { transform:translateX(36px); }
.reveal.revealed, .reveal-right.revealed { opacity:1; transform:none; }

/* ═══════════════════════════════
   RESPONSIVE
═══════════════════════════════ */

@media (max-width:1024px) {
  .why-grid { grid-template-columns:repeat(2,1fr); }
  .impact-grid { grid-template-columns:repeat(2,1fr); }
  .svc-grid { grid-template-columns:repeat(2,1fr); }
  .gallery-grid { grid-template-columns:repeat(3,1fr); }
  .gal-item:nth-child(1),
  .gal-item:nth-child(7) { grid-column:span 1; }
  .footer-inner { grid-template-columns:1fr 1fr; gap:32px; }
  .about-grid { gap:36px; }
}

@media (max-width:768px) {
  section { padding:60px 0; }

  .nav-menu {
    display:none; flex-direction:column; gap:4px;
    position:fixed; top:70px; left:0; right:0;
    background:rgba(5,13,26,.97); backdrop-filter:blur(12px);
    padding:20px 24px 28px; border-bottom:1px solid rgba(255,255,255,.08);
  }
  .nav-menu.open { display:flex; }
  .nav-menu a { padding:12px 16px; border-radius:8px; }
  .hamburger { display:flex; }

  .hero-content h1 { font-size:2rem; }
  .about-grid { grid-template-columns:1fr; }
  .about-img { order:1; } .about-text { order:2; }
  .about-img img { height:280px; }

  .why-grid { grid-template-columns:1fr; }
  .impact-grid { grid-template-columns:1fr 1fr; }
  .svc-grid { grid-template-columns:1fr; }
  .gallery-grid { grid-template-columns:repeat(2,1fr); }
  .gal-item:nth-child(1) { grid-column:span 2; }
  .gal-item:nth-child(7) { grid-column:span 1; }
  .ptn-grid { grid-template-columns:1fr; }
  .contact-grid { grid-template-columns:1fr; gap:36px; }
  .footer-inner { grid-template-columns:1fr; gap:28px; }
  .footer-bottom { flex-direction:column; text-align:center; }
  .expo-inner { flex-direction:column; align-items:flex-start; }
  .expo-inner .btn-primary { margin-left:0; }
  .form-row { grid-template-columns:1fr; }
  .stats-row { flex-wrap:wrap; }
  .stat-div { display:none; }
  .stat-item { flex:0 0 50%; }
}

@media (max-width:480px) {
  .impact-grid { grid-template-columns:1fr; }
  .gallery-grid { grid-template-columns:1fr; }
  .gal-item:nth-child(1) { grid-column:span 1; }
  .stat-item { flex:0 0 100%; }
  .hero-btns { flex-direction:column; }
  .btn-primary, .btn-outline { text-align:center; }
}

/* ── Korean font override ── */
[data-lang="ko"] body,
[data-lang="ko"] .hero-content h1,
[data-lang="ko"] h2,
[data-lang="ko"] h3 {
  font-family: 'Noto Sans KR', 'Inter', sans-serif;
}