/* ============================================================
   ESK Co., Ltd. — style.css
   ============================================================ */

@import url('https://fonts.googleapis.com/css2?family=Montserrat:wght@400;500;600;700;800&family=Noto+Sans+KR:wght@400;500;700;800&display=swap');

/* ── CSS Custom Properties ───────────────────────────────── */
:root {
  --clr-primary:    #0B3B5C;
  --clr-primary-dk: #072A42;
  --clr-primary-lt: #15507D;
  --clr-accent:     #1FA9A0;
  --clr-accent-dk:  #148880;
  --clr-bg:         #F4F6F8;
  --clr-white:      #FFFFFF;
  --clr-text:       #1A1F24;
  --clr-text-muted: #667085;
  --clr-border:     #E2E6EA;
  --clr-overlay:    rgba(7,30,46,0.60);

  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 16px;

  --shadow-sm: 0 2px 8px rgba(11,59,92,0.08);
  --shadow-md: 0 4px 20px rgba(11,59,92,0.12);
  --shadow-lg: 0 8px 40px rgba(11,59,92,0.18);

  --header-h: 72px;
  --section-pad: clamp(60px, 8vw, 100px);
  --container: 1200px;
  --gap: 24px;

  --transition: 0.3s ease;
}

/* ── Reset ───────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: 'Noto Sans KR', 'Montserrat', sans-serif;
  color: var(--clr-text);
  background: var(--clr-white);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
img, video { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
ul, ol { list-style: none; }
button { cursor: pointer; border: none; background: none; font: inherit; }

/* ── Utility ─────────────────────────────────────────────── */
.container {
  width: min(var(--container), 100% - 2 * var(--gap));
  margin-inline: auto;
}
.section { padding: var(--section-pad) 0; }
.section--alt { background: var(--clr-bg); }

.section-header {
  text-align: center;
  margin-bottom: clamp(36px, 5vw, 60px);
}
.section-header .eyebrow {
  display: inline-block;
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--clr-accent-dk);
  text-transform: uppercase;
  margin-bottom: 0.6rem;
}
.section-header h2 {
  font-size: clamp(1.75rem, 3.5vw, 2.75rem);
  font-weight: 800;
  color: var(--clr-text);
  margin-bottom: 0.5rem;
  position: relative;
  display: inline-block;
}
.section-header h2::after {
  content: '';
  display: block;
  width: 52px;
  height: 4px;
  background: var(--clr-accent);
  margin: 10px auto 0;
  border-radius: 2px;
}
.section-header p {
  color: var(--clr-text-muted);
  font-size: clamp(0.95rem, 1.5vw, 1.1rem);
  max-width: 620px;
  margin-inline: auto;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5em;
  padding: 0.85em 1.8em;
  border-radius: var(--radius-sm);
  font-weight: 700;
  font-size: 0.95rem;
  transition: var(--transition);
}
.btn--primary { background: var(--clr-accent); color: var(--clr-white); }
.btn--primary:hover { background: var(--clr-accent-dk); transform: translateY(-2px); box-shadow: var(--shadow-md); }
.btn--outline { background: transparent; color: var(--clr-white); border: 2px solid rgba(255,255,255,0.65); }
.btn--outline:hover { background: rgba(255,255,255,0.12); border-color: #fff; }
.btn--ghost { background: transparent; color: var(--clr-primary); border: 2px solid var(--clr-border); }
.btn--ghost:hover { border-color: var(--clr-primary); }

/* ── Header ──────────────────────────────────────────────── */
header#main-header {
  position: fixed;
  inset: 0 0 auto 0;
  height: var(--header-h);
  z-index: 1000;
  transition: var(--transition);
  background: transparent;
}
header#main-header.scrolled,
header#main-header.is-scrolled {
  background: var(--clr-white);
  box-shadow: var(--shadow-sm);
}
.header-inner {
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.logo { display: flex; align-items: center; gap: 10px; }
.logo-badge {
  width: 36px; height: 36px;
  border-radius: var(--radius-sm);
  background: var(--clr-primary);
  color: #fff;
  display: flex; align-items: center; justify-content: center;
  font-weight: 800; font-size: 0.95rem; letter-spacing: 0.02em;
}
.logo-text { display: flex; flex-direction: column; line-height: 1.15; }
.logo-main { font-weight: 800; font-size: 1.05rem; color: var(--clr-primary); letter-spacing: 0.01em; }
header#main-header:not(.scrolled):not(.is-scrolled) .logo-main { color: #fff; }
header#main-header:not(.scrolled):not(.is-scrolled) .logo-badge { background: rgba(255,255,255,0.18); }
.logo-sub { font-size: 0.68rem; color: var(--clr-text-muted); font-weight: 600; letter-spacing: 0.04em; }
header#main-header:not(.scrolled):not(.is-scrolled) .logo-sub { color: rgba(255,255,255,0.75); }

nav#main-nav { display: flex; align-items: center; gap: 2.2rem; }
nav#main-nav a {
  font-weight: 600;
  font-size: 0.92rem;
  color: var(--clr-text);
  position: relative;
  padding: 4px 0;
}
header#main-header:not(.scrolled):not(.is-scrolled) nav#main-nav a { color: #fff; }
nav#main-nav a::after {
  content: '';
  position: absolute;
  left: 0; bottom: -4px;
  width: 0; height: 2px;
  background: var(--clr-accent);
  transition: var(--transition);
}
nav#main-nav a:hover::after,
nav#main-nav a.active::after { width: 100%; }

#menu-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  width: 28px;
}
#menu-toggle span {
  height: 2px; width: 100%;
  background: var(--clr-text);
  border-radius: 2px;
  transition: var(--transition);
}
header#main-header:not(.scrolled):not(.is-scrolled) #menu-toggle span { background: #fff; }

#nav-overlay {
  position: fixed; inset: 0;
  background: rgba(7,30,46,0.55);
  opacity: 0; pointer-events: none;
  transition: var(--transition);
  z-index: 999;
}
#nav-overlay.open { opacity: 1; pointer-events: auto; }

@media (max-width: 860px) {
  nav#main-nav {
    position: fixed;
    top: 0; right: -320px;
    width: 300px; height: 100vh;
    background: var(--clr-white);
    flex-direction: column;
    align-items: flex-start;
    padding: calc(var(--header-h) + 24px) 28px 28px;
    box-shadow: var(--shadow-lg);
    transition: right 0.35s ease;
    z-index: 1001;
  }
  nav#main-nav.open { right: 0; }
  nav#main-nav a { color: var(--clr-text) !important; font-size: 1.05rem; }
  #menu-toggle { display: flex; }
}

/* ── Hero ────────────────────────────────────────────────── */
#hero {
  position: relative;
  height: 100svh;
  min-height: 560px;
  overflow: hidden;
  color: #fff;
}
.hero-slider { position: absolute; inset: 0; }
.hero-slide {
  position: absolute; inset: 0;
  opacity: 0;
  transition: opacity 1.1s ease;
  background-size: cover;
  background-position: center;
}
.hero-slide.active { opacity: 1; }
.hero-slide::before {
  content: '';
  position: absolute; inset: 0;
  background: linear-gradient(180deg, rgba(7,30,46,0.55) 0%, rgba(7,30,46,0.72) 100%);
}
.hero-content {
  position: relative;
  z-index: 2;
  height: 100%;
  display: flex;
  flex-direction: column;
  justify-content: center;
  max-width: 720px;
}
.hero-content .eyebrow {
  display: inline-block;
  font-size: 0.85rem; font-weight: 700;
  letter-spacing: 0.1em; text-transform: uppercase;
  color: var(--clr-accent);
  margin-bottom: 1rem;
}
.hero-content h1 {
  font-size: clamp(2.1rem, 5vw, 3.6rem);
  font-weight: 800;
  line-height: 1.25;
  margin-bottom: 1.2rem;
}
.hero-content h1 em { color: var(--clr-accent); font-style: normal; }
.hero-content p {
  font-size: clamp(1rem, 1.6vw, 1.2rem);
  color: rgba(255,255,255,0.88);
  margin-bottom: 2rem;
  max-width: 560px;
}
.hero-actions { display: flex; gap: 1rem; flex-wrap: wrap; }

.hero-dots {
  position: absolute;
  left: 50%; bottom: 28px;
  transform: translateX(-50%);
  display: flex; gap: 10px;
  z-index: 3;
}
.hero-dots button {
  width: 9px; height: 9px;
  border-radius: 50%;
  background: rgba(255,255,255,0.4);
  transition: var(--transition);
}
.hero-dots button.active { background: var(--clr-accent); width: 24px; border-radius: 5px; }

/* page header for sub-pages (no fullscreen hero) */
.page-header {
  background: linear-gradient(180deg, var(--clr-primary-dk), var(--clr-primary));
  color: #fff;
  padding: calc(var(--header-h) + 64px) 0 72px;
  text-align: center;
}
.page-header .eyebrow { color: var(--clr-accent); font-weight: 700; letter-spacing: 0.08em; text-transform: uppercase; font-size: 0.85rem; margin-bottom: 0.6rem; }
.page-header h1 { font-size: clamp(1.9rem, 4vw, 2.8rem); font-weight: 800; margin-bottom: 0.7rem; }
.page-header p { color: rgba(255,255,255,0.82); max-width: 560px; margin-inline: auto; }
.breadcrumb { margin-top: 1.2rem; font-size: 0.85rem; color: rgba(255,255,255,0.65); }
.breadcrumb a { color: rgba(255,255,255,0.85); font-weight: 600; }
.breadcrumb span { margin: 0 6px; }

/* ── Grid / Cards ────────────────────────────────────────── */
.grid { display: grid; gap: var(--gap); }
.grid--2 { grid-template-columns: repeat(2, 1fr); }
.grid--3 { grid-template-columns: repeat(3, 1fr); }
.grid--4 { grid-template-columns: repeat(4, 1fr); }
@media (max-width: 960px) { .grid--3, .grid--4 { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 640px) { .grid--2, .grid--3, .grid--4 { grid-template-columns: 1fr; } }

.card {
  background: var(--clr-white);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: var(--transition);
  box-shadow: var(--shadow-sm);
}
.card:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); border-color: transparent; }
.card-img { aspect-ratio: 4/3; overflow: hidden; }
.card-img img { width: 100%; height: 100%; object-fit: cover; transition: transform 0.5s ease; }
.card:hover .card-img img { transform: scale(1.06); }
.card-body { padding: 24px; }
.card-body .tag {
  display: inline-block;
  font-size: 0.72rem; font-weight: 700;
  color: var(--clr-accent-dk);
  background: rgba(31,169,160,0.12);
  padding: 3px 10px;
  border-radius: 999px;
  margin-bottom: 10px;
  letter-spacing: 0.02em;
}
.card-body h3 { font-size: 1.15rem; font-weight: 800; margin-bottom: 8px; color: var(--clr-text); }
.card-body p { color: var(--clr-text-muted); font-size: 0.92rem; }
.card-body ul { margin-top: 12px; }
.card-body ul li {
  font-size: 0.88rem;
  color: var(--clr-text-muted);
  padding-left: 1.1em;
  position: relative;
  margin-bottom: 6px;
}
.card-body ul li::before {
  content: '';
  position: absolute; left: 0; top: 0.55em;
  width: 6px; height: 6px;
  border-radius: 50%;
  background: var(--clr-accent);
}

/* ── Business area split cards (home) ────────────────────── */
.biz-card {
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  min-height: 360px;
  display: flex;
  align-items: flex-end;
  color: #fff;
  box-shadow: var(--shadow-md);
}
.biz-card img { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; transition: transform 0.6s ease; }
.biz-card::before {
  content: '';
  position: absolute; inset: 0;
  background: linear-gradient(180deg, rgba(7,30,46,0.15) 0%, rgba(7,30,46,0.88) 100%);
  z-index: 1;
}
.biz-card:hover img { transform: scale(1.08); }
.biz-card-body { position: relative; z-index: 2; padding: 32px; }
.biz-card-body .tag { color: var(--clr-accent); font-weight: 700; font-size: 0.78rem; letter-spacing: 0.08em; text-transform: uppercase; }
.biz-card-body h3 { font-size: 1.5rem; font-weight: 800; margin: 8px 0 10px; }
.biz-card-body p { color: rgba(255,255,255,0.82); margin-bottom: 14px; font-size: 0.95rem; }
.biz-card-body .link { font-weight: 700; color: #fff; display: inline-flex; align-items: center; gap: 6px; }

/* ── Stats counter ───────────────────────────────────────── */
.stats {
  background: var(--clr-primary);
  color: #fff;
}
.stats-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: var(--gap); text-align: center; }
@media (max-width: 760px) { .stats-grid { grid-template-columns: repeat(2, 1fr); } }
.stat-num { font-size: clamp(1.8rem, 3.5vw, 2.6rem); font-weight: 800; color: var(--clr-accent); }
.stat-label { font-size: 0.85rem; color: rgba(255,255,255,0.78); margin-top: 6px; }

/* ── Process steps ───────────────────────────────────────── */
.process { display: flex; gap: var(--gap); flex-wrap: wrap; justify-content: space-between; }
.process-step { flex: 1 1 200px; text-align: center; position: relative; }
.process-step .num {
  width: 48px; height: 48px; margin: 0 auto 16px;
  border-radius: 50%;
  background: var(--clr-primary);
  color: #fff;
  display: flex; align-items: center; justify-content: center;
  font-weight: 800;
}
.process-step h4 { font-weight: 800; margin-bottom: 6px; }
.process-step p { color: var(--clr-text-muted); font-size: 0.88rem; }

/* ── About page ──────────────────────────────────────────── */
.about-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 48px; align-items: center; }
@media (max-width: 860px) { .about-grid { grid-template-columns: 1fr; } }
.about-img { border-radius: var(--radius-lg); overflow: hidden; box-shadow: var(--shadow-md); }
.ceo-quote {
  border-left: 4px solid var(--clr-accent);
  padding-left: 20px;
  font-size: 1.05rem;
  color: var(--clr-text);
  margin: 1.4rem 0;
  font-weight: 600;
}
.info-table { width: 100%; border-collapse: collapse; margin-top: 1rem; }
.info-table tr { border-bottom: 1px solid var(--clr-border); }
.info-table th, .info-table td { text-align: left; padding: 12px 14px; font-size: 0.92rem; }
.info-table th { width: 140px; color: var(--clr-text-muted); font-weight: 700; background: var(--clr-bg); }

.timeline { position: relative; padding-left: 28px; }
.timeline::before { content: ''; position: absolute; left: 5px; top: 4px; bottom: 4px; width: 2px; background: var(--clr-border); }
.timeline-item { position: relative; margin-bottom: 24px; }
.timeline-item::before {
  content: ''; position: absolute; left: -28px; top: 4px;
  width: 12px; height: 12px; border-radius: 50%;
  background: var(--clr-accent); border: 3px solid var(--clr-white); box-shadow: 0 0 0 2px var(--clr-accent);
}
.timeline-item .date { font-weight: 800; color: var(--clr-primary); font-size: 0.9rem; }
.timeline-item p { color: var(--clr-text-muted); font-size: 0.92rem; margin-top: 2px; }

/* ── Contact ─────────────────────────────────────────────── */
.contact-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 48px; }
@media (max-width: 860px) { .contact-grid { grid-template-columns: 1fr; } }
.contact-info-item { display: flex; gap: 16px; margin-bottom: 24px; }
.contact-info-item .icon {
  width: 44px; height: 44px; flex-shrink: 0;
  border-radius: var(--radius-sm);
  background: rgba(31,169,160,0.12);
  color: var(--clr-accent-dk);
  display: flex; align-items: center; justify-content: center;
  font-size: 1.1rem;
}
.contact-info-item h4 { font-weight: 800; margin-bottom: 4px; }
.contact-info-item p, .contact-info-item a { color: var(--clr-text-muted); font-size: 0.92rem; }

.form-group { margin-bottom: 18px; }
.form-group label { display: block; font-weight: 700; font-size: 0.88rem; margin-bottom: 6px; }
.form-group input, .form-group select, .form-group textarea {
  width: 100%;
  padding: 12px 14px;
  border: 1px solid var(--clr-border);
  border-radius: var(--radius-sm);
  font: inherit;
  font-size: 0.92rem;
  transition: var(--transition);
  background: var(--clr-white);
}
.form-group input:focus, .form-group select:focus, .form-group textarea:focus {
  outline: none; border-color: var(--clr-accent);
  box-shadow: 0 0 0 3px rgba(31,169,160,0.15);
}
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
@media (max-width: 560px) { .form-row { grid-template-columns: 1fr; } }

/* ── Footer ──────────────────────────────────────────────── */
footer#main-footer {
  background: var(--clr-primary-dk);
  color: rgba(255,255,255,0.75);
  padding: 56px 0 24px;
  font-size: 0.88rem;
}
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr; gap: 40px; margin-bottom: 36px; }
@media (max-width: 760px) { .footer-grid { grid-template-columns: 1fr; gap: 28px; } }
.footer-grid h5 { color: #fff; font-weight: 800; margin-bottom: 14px; font-size: 0.95rem; }
.footer-grid li { margin-bottom: 8px; }
.footer-grid a:hover { color: #fff; }
.footer-logo { display: flex; align-items: center; gap: 10px; margin-bottom: 14px; }
.footer-logo .logo-badge { background: var(--clr-accent); }
.footer-logo span { color: #fff; font-weight: 800; font-size: 1.05rem; }
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.12);
  padding-top: 20px;
  display: flex; justify-content: space-between; flex-wrap: wrap; gap: 10px;
  font-size: 0.8rem;
  color: rgba(255,255,255,0.55);
}

/* ── Scroll reveal ───────────────────────────────────────── */
.reveal { opacity: 0; transform: translateY(24px); transition: opacity 0.7s ease, transform 0.7s ease; }
.reveal.in { opacity: 1; transform: translateY(0); }