/* Korea JackPile Engineering — US partner site (KRENC-inspired) */
:root {
  --navy: #0b1f3a;
  --navy-2: #132d52;
  --blue: #1a5fb4;
  --blue-lt: #3d8bfd;
  --red: #c8102e;
  --gold: #c9a227;
  --bg: #f5f7fb;
  --white: #ffffff;
  --text: #1c2430;
  --muted: #5b6777;
  --border: #e2e8f0;
  --shadow: 0 10px 30px rgba(11, 31, 58, 0.08);
  --radius: 12px;
  --max: 1180px;
  --font: "Segoe UI", system-ui, -apple-system, Roboto, "Helvetica Neue", Arial, sans-serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--font);
  color: var(--text);
  background: var(--bg);
  line-height: 1.6;
}
img { max-width: 100%; height: auto; display: block; }
a { color: var(--blue); text-decoration: none; }
a:hover { color: var(--red); }
.container { width: min(100% - 2rem, var(--max)); margin-inline: auto; }
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0,0,0,0); border: 0; }

/* Partner top bar */
.partner-bar {
  background: linear-gradient(90deg, var(--navy), var(--navy-2) 55%, #1a3a66);
  color: #dbe7f8;
  font-size: 0.85rem;
  padding: 0.55rem 0;
}
.partner-bar .container {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem 1.5rem;
  justify-content: space-between;
  align-items: center;
}
.partner-bar strong { color: #fff; }
.partner-bar a { color: #9ec5ff; }
.partner-bar .phones a { margin-left: 0.75rem; white-space: nowrap; }

/* Header */
.site-header {
  background: var(--white);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: 0 2px 12px rgba(0,0,0,0.04);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.85rem 0;
}
.brand {
  display: flex;
  align-items: center;
  gap: 0.85rem;
  color: inherit;
}
.brand-mark {
  width: 48px;
  height: 48px;
  border-radius: 10px;
  background: linear-gradient(145deg, var(--navy), var(--blue));
  color: #fff;
  display: grid;
  place-items: center;
  font-weight: 800;
  font-size: 0.85rem;
  letter-spacing: -0.03em;
  flex-shrink: 0;
}
.brand-text { display: flex; flex-direction: column; line-height: 1.2; }
.brand-text .name { font-weight: 800; color: var(--navy); font-size: 1.05rem; }
.brand-text .tag { font-size: 0.72rem; color: var(--muted); max-width: 220px; }
.nav-toggle {
  display: none;
  border: 1px solid var(--border);
  background: #fff;
  border-radius: 8px;
  padding: 0.5rem 0.7rem;
  cursor: pointer;
}
.main-nav ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  gap: 0.15rem;
  align-items: center;
  flex-wrap: wrap;
}
.main-nav a {
  display: block;
  padding: 0.55rem 0.75rem;
  color: var(--navy);
  font-weight: 600;
  font-size: 0.92rem;
  border-radius: 8px;
}
.main-nav a:hover, .main-nav a.active {
  background: #eef4ff;
  color: var(--blue);
}
.main-nav .btn-cta {
  background: var(--red);
  color: #fff !important;
  margin-left: 0.35rem;
}
.main-nav .btn-cta:hover { background: #a50d25; }

/* Hero */
.hero {
  position: relative;
  min-height: 520px;
  color: #fff;
  display: grid;
  align-items: end;
  background: var(--navy) center/cover no-repeat;
  isolation: isolate;
}
.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(100deg, rgba(8,20,40,0.92) 0%, rgba(8,20,40,0.55) 55%, rgba(8,20,40,0.35) 100%);
  z-index: 0;
}
.hero-inner {
  position: relative;
  z-index: 1;
  padding: 4.5rem 0 3.5rem;
}
.hero .eyebrow {
  display: inline-block;
  background: rgba(201, 162, 39, 0.18);
  border: 1px solid rgba(201, 162, 39, 0.55);
  color: #f0d78c;
  padding: 0.35rem 0.75rem;
  border-radius: 999px;
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  margin-bottom: 1rem;
}
.hero h1 {
  font-size: clamp(1.8rem, 4vw, 2.85rem);
  line-height: 1.15;
  margin: 0 0 1rem;
  max-width: 16ch;
}
.hero p {
  font-size: 1.08rem;
  max-width: 42rem;
  color: #d7e3f5;
  margin: 0 0 1.5rem;
}
.hero-actions { display: flex; flex-wrap: wrap; gap: 0.75rem; }
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  padding: 0.8rem 1.25rem;
  border-radius: 10px;
  font-weight: 700;
  border: 2px solid transparent;
  cursor: pointer;
  transition: 0.15s ease;
}
.btn-primary { background: var(--red); color: #fff; }
.btn-primary:hover { background: #a50d25; color: #fff; }
.btn-secondary { background: transparent; border-color: rgba(255,255,255,0.55); color: #fff; }
.btn-secondary:hover { background: rgba(255,255,255,0.1); color: #fff; }
.btn-outline {
  background: #fff;
  border-color: var(--border);
  color: var(--navy);
}
.btn-outline:hover { border-color: var(--blue); color: var(--blue); }

/* Sections */
section { padding: 3.5rem 0; }
.section-head {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: end;
  gap: 1rem;
  margin-bottom: 1.75rem;
}
.section-head h2 {
  margin: 0;
  font-size: clamp(1.45rem, 2.5vw, 1.9rem);
  color: var(--navy);
}
.section-head p { margin: 0.35rem 0 0; color: var(--muted); max-width: 42rem; }
.kicker {
  color: var(--red);
  font-size: 0.8rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin: 0 0 0.35rem;
}

/* Cards */
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.25rem; }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1.1rem; }
.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 1.5rem; }
.card {
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}
.card:hover { transform: translateY(-3px); box-shadow: 0 16px 36px rgba(11,31,58,0.12); }
.card-body { padding: 1.15rem 1.2rem 1.35rem; }
.card h3 { margin: 0 0 0.5rem; color: var(--navy); font-size: 1.1rem; }
.card p { margin: 0; color: var(--muted); font-size: 0.95rem; }
.card .meta {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
  margin-top: 0.85rem;
}
.badge {
  display: inline-block;
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  padding: 0.25rem 0.55rem;
  border-radius: 999px;
  background: #eef4ff;
  color: var(--blue);
}
.badge-gold { background: #fff6db; color: #8a6d12; }
.badge-red { background: #ffe8ec; color: var(--red); }
.card-media {
  aspect-ratio: 16/10;
  background: #d9e2ef center/cover no-repeat;
  position: relative;
  overflow: hidden;
}
.card-media-img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}
.card-media .source-tag {
  position: absolute;
  left: 0.6rem;
  bottom: 0.6rem;
  background: rgba(11,31,58,0.78);
  color: #fff;
  font-size: 0.68rem;
  padding: 0.2rem 0.45rem;
  border-radius: 6px;
  z-index: 1;
}

/* Tech icons strip */
.tech-card .icon-wrap {
  height: 160px;
  display: grid;
  place-items: center;
  background: linear-gradient(180deg, #edf3ff, #fff);
  padding: 1rem;
}
.tech-card .icon-wrap img { max-height: 120px; width: auto; }

/* Trust strip */
.trust-strip {
  background: var(--navy);
  color: #d7e3f5;
  padding: 1.75rem 0;
}
.trust-strip .container {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1rem;
  text-align: center;
}
.trust-strip strong {
  display: block;
  color: #fff;
  font-size: 1.35rem;
  margin-bottom: 0.2rem;
}
.trust-strip span { font-size: 0.88rem; }

/* Page hero */
.page-hero {
  background: linear-gradient(120deg, var(--navy), var(--navy-2));
  color: #fff;
  padding: 2.75rem 0 2.25rem;
}
.page-hero h1 { margin: 0 0 0.5rem; font-size: clamp(1.6rem, 3vw, 2.2rem); }
.page-hero p { margin: 0; color: #c9d8ef; max-width: 48rem; }
.breadcrumb {
  font-size: 0.85rem;
  color: #93a9c9;
  margin-bottom: 0.75rem;
}
.breadcrumb a { color: #b8cdf0; }

/* Content */
.prose {
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.75rem;
  box-shadow: var(--shadow);
}
.prose h2 { color: var(--navy); margin-top: 1.75rem; }
.prose h2:first-child { margin-top: 0; }
.prose h3 { color: var(--navy-2); }
.prose ul { padding-left: 1.2rem; }
.prose li { margin: 0.35rem 0; }
.prose .note {
  background: #fff8e8;
  border-left: 4px solid var(--gold);
  padding: 0.85rem 1rem;
  margin: 1.25rem 0;
  border-radius: 0 8px 8px 0;
}
.prose .note.partner {
  background: #eef5ff;
  border-left-color: var(--blue);
}

/* Filters */
.filters {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 1.5rem;
}
.filter-btn {
  border: 1px solid var(--border);
  background: #fff;
  border-radius: 999px;
  padding: 0.45rem 0.9rem;
  font-weight: 600;
  cursor: pointer;
  color: var(--navy);
}
.filter-btn.active, .filter-btn:hover {
  background: var(--navy);
  color: #fff;
  border-color: var(--navy);
}

/* FAQ */
.faq details {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 0.9rem 1.1rem;
  margin-bottom: 0.65rem;
}
.faq summary {
  cursor: pointer;
  font-weight: 700;
  color: var(--navy);
}
.faq details[open] summary { color: var(--blue); margin-bottom: 0.5rem; }
.faq p { margin: 0; color: var(--muted); }

/* Contact */
.contact-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 1.5rem;
}
.form label { display: block; font-weight: 600; margin: 0.75rem 0 0.3rem; font-size: 0.92rem; }
.form input, .form select, .form textarea {
  width: 100%;
  padding: 0.7rem 0.8rem;
  border: 1px solid var(--border);
  border-radius: 8px;
  font: inherit;
}
.form textarea { min-height: 120px; resize: vertical; }
.form .btn { margin-top: 1rem; width: 100%; }
.info-list { list-style: none; padding: 0; margin: 0; }
.info-list li {
  padding: 0.75rem 0;
  border-bottom: 1px solid var(--border);
}
.info-list strong { display: block; color: var(--navy); }

/* Docs list */
.doc-list {
  display: grid;
  gap: 0.65rem;
}
.doc-item {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  align-items: center;
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 0.9rem 1.1rem;
}
.doc-item span { color: var(--muted); font-size: 0.85rem; }

/* Footer */
.site-footer {
  background: #071526;
  color: #a9bbd4;
  padding: 3rem 0 1.5rem;
  margin-top: 2rem;
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1fr;
  gap: 1.5rem;
  margin-bottom: 2rem;
}
.site-footer h4 { color: #fff; margin: 0 0 0.75rem; font-size: 0.95rem; }
.site-footer a { color: #a9bbd4; }
.site-footer a:hover { color: #fff; }
.site-footer ul { list-style: none; padding: 0; margin: 0; }
.site-footer li { margin: 0.35rem 0; }
.footer-brand .name { color: #fff; font-weight: 800; font-size: 1.1rem; }
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.08);
  padding-top: 1rem;
  font-size: 0.82rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  justify-content: space-between;
}
.attr-note {
  font-size: 0.8rem;
  color: #7f93b0;
  margin-top: 0.75rem;
}

/* Responsive */
@media (max-width: 960px) {
  .grid-3, .grid-4, .trust-strip .container, .footer-grid, .contact-grid, .grid-2 {
    grid-template-columns: 1fr 1fr;
  }
  .nav-toggle { display: inline-block; }
  .main-nav { display: none; width: 100%; }
  .main-nav.open { display: block; }
  .main-nav ul { flex-direction: column; align-items: stretch; padding: 0.5rem 0 0.75rem; }
  .header-inner { flex-wrap: wrap; }
}
@media (max-width: 640px) {
  .grid-3, .grid-4, .trust-strip .container, .footer-grid, .contact-grid, .grid-2 {
    grid-template-columns: 1fr;
  }
  .hero { min-height: 440px; }
}