:root {
  --color-navy: #071426;
  --color-navy-soft: #0f233d;
  --color-blue: #2563eb;
  --color-sky: #0ea5e9;
  --color-cyan: #67e8f9;
  --color-text: #142033;
  --color-muted: #627089;
  --color-line: #dce7f5;
  --color-bg: #f5f8fc;
  --color-card: #ffffff;
  --shadow-card: 0 24px 60px rgba(7, 20, 38, .10);
  --shadow-soft: 0 18px 42px rgba(37, 99, 235, .14);
  --radius-xl: 32px;
  --radius-lg: 24px;
  --radius-md: 16px;
  --container: 1180px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: Inter, Pretendard, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Noto Sans KR", "Apple SD Gothic Neo", "Malgun Gothic", sans-serif;
  color: var(--color-text);
  background: #fff;
  line-height: 1.65;
  word-break: keep-all;
  overflow-x: hidden;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
button, input, textarea { font: inherit; }
::selection { background: rgba(37, 99, 235, .22); }

.skip-link {
  position: absolute; left: 1rem; top: -3rem; z-index: 9999;
  background: var(--color-navy); color: #fff; padding: .65rem 1rem; border-radius: 999px;
  transition: top .2s ease;
}
.skip-link:focus { top: 1rem; }

.container { width: min(100% - 40px, var(--container)); margin: 0 auto; }
.section { padding: 108px 0; }
.section.compact { padding: 72px 0; }
.section-head { display: grid; grid-template-columns: minmax(0, .9fr) minmax(280px, .55fr); gap: 44px; align-items: end; margin-bottom: 48px; }
.eyebrow {
  display: inline-flex; gap: 8px; align-items: center; margin: 0 0 14px;
  color: var(--color-blue); font-size: 14px; font-weight: 800; letter-spacing: .09em; text-transform: uppercase;
}
.eyebrow::before { content: ""; width: 8px; height: 8px; border-radius: 50%; background: linear-gradient(135deg, var(--color-sky), var(--color-blue)); box-shadow: 0 0 0 7px rgba(14,165,233,.12); }
h1, h2, h3, p { margin-top: 0; }
h1 { font-size: clamp(44px, 7.4vw, 92px); line-height: .98; letter-spacing: -.065em; margin-bottom: 24px; }
h2 { font-size: clamp(34px, 5vw, 60px); line-height: 1.08; letter-spacing: -.048em; margin-bottom: 20px; }
h3 { font-size: clamp(22px, 2.4vw, 32px); line-height: 1.2; letter-spacing: -.025em; margin-bottom: 14px; }
.lead { font-size: clamp(18px, 2vw, 22px); color: #dce9ff; max-width: 720px; line-height: 1.72; }
.body-large { font-size: 19px; color: var(--color-muted); }
.muted { color: var(--color-muted); }
.text-gradient { background: linear-gradient(120deg, #7dd3fc, #60a5fa 55%, #bfdbfe); -webkit-background-clip: text; background-clip: text; color: transparent; }
.text-blue { color: var(--color-blue); }

.site-header {
  position: fixed; top: 0; left: 0; right: 0; z-index: 1000;
  padding: 18px 0; transition: background .22s ease, box-shadow .22s ease, padding .22s ease, backdrop-filter .22s ease;
}
.site-header.is-scrolled { padding: 10px 0; background: rgba(255,255,255,.86); box-shadow: 0 12px 32px rgba(7,20,38,.08); backdrop-filter: blur(14px); }
.navbar { display: flex; align-items: center; justify-content: space-between; gap: 24px; }
.logo { display: inline-flex; align-items: center; min-width: 156px; }
.logo img { width: 174px; height: auto; }
.logo-dark { display: none; }
.site-header.is-scrolled .logo-light { display: none; }
.site-header.is-scrolled .logo-dark { display: block; }
.nav-menu { display: flex; align-items: center; gap: 8px; list-style: none; padding: 0; margin: 0; }
.nav-menu a { display: inline-flex; align-items: center; min-height: 40px; padding: 0 15px; border-radius: 999px; color: rgba(255,255,255,.86); font-size: 15px; font-weight: 750; transition: color .2s ease, background .2s ease; }
.site-header.is-scrolled .nav-menu a { color: #12213a; }
.nav-menu a:hover, .nav-menu a:focus-visible { background: rgba(255,255,255,.14); color: #fff; outline: none; }
.site-header.is-scrolled .nav-menu a:hover, .site-header.is-scrolled .nav-menu a:focus-visible { background: rgba(37,99,235,.09); color: var(--color-blue); }
.nav-action { display: inline-flex; min-height: 42px; align-items: center; padding: 0 18px; border-radius: 999px; color: #fff; background: linear-gradient(135deg, var(--color-sky), var(--color-blue)); font-weight: 800; box-shadow: 0 12px 26px rgba(37,99,235,.30); }
.nav-toggle { display: none; width: 44px; height: 44px; border: 0; background: rgba(255,255,255,.12); border-radius: 14px; cursor: pointer; }
.nav-toggle span { display: block; width: 20px; height: 2px; background: #fff; margin: 5px auto; transition: transform .2s ease, opacity .2s ease; }
.site-header.is-scrolled .nav-toggle { background: rgba(37,99,235,.09); }
.site-header.is-scrolled .nav-toggle span { background: var(--color-navy); }

.hero {
  position: relative;
  min-height: 900px;
  padding: 150px 0 112px;
  color: #fff;
  background: var(--color-navy);
  display: flex;
  align-items: center;
  isolation: isolate;
  overflow: hidden;
}
.hero::before {
  content: ""; position: absolute; inset: 0; z-index: -2;
  background-image: linear-gradient(100deg, rgba(7,20,38,.94) 0%, rgba(7,20,38,.79) 42%, rgba(7,20,38,.22) 80%), url('../img/hero-seoul-network.webp');
  background-size: cover; background-position: center;
  transform: scale(1.02);
}
.hero::after {
  content: ""; position: absolute; inset: 0; z-index: -1;
  background: radial-gradient(circle at 20% 20%, rgba(14,165,233,.28), transparent 32%), radial-gradient(circle at 82% 12%, rgba(103,232,249,.20), transparent 26%), linear-gradient(0deg, rgba(7,20,38,.86) 0%, transparent 28%);
}
.hero-content { max-width: 860px; padding-top: 0; }
.hero-kicker { display: inline-flex; align-items: center; gap: 10px; padding: 10px 14px; border: 1px solid rgba(255,255,255,.18); background: rgba(255,255,255,.08); border-radius: 999px; font-size: 14px; font-weight: 800; color: #dff5ff; backdrop-filter: blur(12px); margin-bottom: 24px; }
.hero-kicker span { width: 8px; height: 8px; background: var(--color-cyan); border-radius: 50%; box-shadow: 0 0 22px var(--color-cyan); }
.hero-actions { display: flex; flex-wrap: wrap; gap: 14px; margin-top: 34px; }
.button { display: inline-flex; align-items: center; justify-content: center; gap: 8px; min-height: 52px; padding: 0 22px; border-radius: 999px; border: 1px solid transparent; font-weight: 850; transition: transform .2s ease, box-shadow .2s ease, background .2s ease; }
.button:hover { transform: translateY(-2px); }
.button-primary { color: #fff; background: linear-gradient(135deg, var(--color-sky), var(--color-blue)); box-shadow: 0 18px 36px rgba(37,99,235,.30); }
.button-secondary { color: #eaf7ff; border-color: rgba(255,255,255,.22); background: rgba(255,255,255,.08); backdrop-filter: blur(12px); }
.button-light { background: #fff; color: var(--color-navy); box-shadow: var(--shadow-soft); }
.button-outline { color: var(--color-blue); border-color: rgba(37,99,235,.22); background: #fff; box-shadow: 0 12px 26px rgba(37,99,235,.08); }
.button-outline:hover { background: rgba(37,99,235,.06); }
.hero-metrics { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 16px; margin-top: 70px; max-width: 820px; }
.metric-card { padding: 22px; border: 1px solid rgba(255,255,255,.16); border-radius: 24px; background: rgba(255,255,255,.08); backdrop-filter: blur(14px); }
.metric-value { display: block; font-size: 30px; line-height: 1; font-weight: 900; letter-spacing: -.04em; margin-bottom: 8px; }
.metric-label { color: rgba(232,244,255,.78); font-size: 15px; }

.hero + .section,
.page-hero + .section { padding-top: clamp(96px, 9vw, 142px); }

.bg-soft { background: var(--color-bg); }
.bg-dark { background: var(--color-navy); color: #fff; }
.bg-dark .muted, .bg-dark .body-large { color: #bbcae2; }
.grid-3 { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 22px; }
.grid-2 { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 28px; }
.card { background: var(--color-card); border: 1px solid rgba(220,231,245,.8); border-radius: var(--radius-lg); padding: 30px; box-shadow: 0 14px 32px rgba(7,20,38,.05); }
.card.dark-card { color: #fff; background: linear-gradient(150deg, rgba(15,35,61,.94), rgba(7,20,38,.98)); border-color: rgba(255,255,255,.12); }
.card-number { display: inline-flex; width: 38px; height: 38px; align-items: center; justify-content: center; border-radius: 50%; background: rgba(37,99,235,.10); color: var(--color-blue); font-weight: 900; margin-bottom: 24px; }
.icon-card { display: flex; gap: 18px; align-items: flex-start; }
.icon { flex: 0 0 48px; width: 48px; height: 48px; display: grid; place-items: center; border-radius: 16px; background: linear-gradient(135deg, rgba(14,165,233,.14), rgba(37,99,235,.14)); color: var(--color-blue); font-size: 22px; }
.icon svg { width: 24px; height: 24px; }
.image-panel { position: relative; min-height: 520px; border-radius: var(--radius-xl); overflow: hidden; box-shadow: var(--shadow-card); background: var(--color-navy); }
.image-panel img { width: 100%; height: 100%; min-height: inherit; object-fit: cover; }
.image-panel::after { content: ""; position: absolute; inset: 0; background: linear-gradient(0deg, rgba(7,20,38,.48), transparent 45%); pointer-events: none; }
.image-caption { position: absolute; left: 26px; right: 26px; bottom: 26px; z-index: 1; padding: 20px; border-radius: 20px; background: rgba(255,255,255,.88); backdrop-filter: blur(16px); box-shadow: 0 18px 40px rgba(7,20,38,.16); }
.image-caption h3 { font-size: 22px; margin-bottom: 6px; }
.image-caption p { margin: 0; color: var(--color-muted); }
.about-layout { display: grid; grid-template-columns: minmax(0, .85fr) minmax(0, 1fr); gap: 56px; align-items: center; }
.value-row { display: grid; grid-template-columns: 110px minmax(0, 1fr); gap: 28px; padding: 28px 0; border-top: 1px solid var(--color-line); }
.value-row:last-child { border-bottom: 1px solid var(--color-line); }
.value-index { color: var(--color-blue); font-weight: 900; letter-spacing: .08em; }
.value-row h3 { margin-bottom: 8px; }
.value-row p { margin: 0; color: var(--color-muted); }

.service-showcase { display: grid; grid-template-columns: minmax(0, 1.05fr) minmax(360px, .72fr); gap: 46px; align-items: center; }
.service-card { padding: 36px; border-radius: var(--radius-xl); background: #fff; box-shadow: var(--shadow-card); border: 1px solid rgba(220,231,245,.9); }
.service-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 30px; }
.stats { display: grid; grid-template-columns: repeat(2, minmax(0,1fr)); gap: 12px; margin: 26px 0 30px; }
.stat { padding: 18px; border-radius: 18px; background: var(--color-bg); }
.stat strong { display: block; color: var(--color-blue); font-size: 28px; line-height: 1; letter-spacing: -.04em; margin-bottom: 7px; }
.stat span { font-size: 14px; color: var(--color-muted); }
.feature-list { list-style: none; padding: 0; margin: 0; display: grid; gap: 13px; }
.feature-list li { position: relative; padding-left: 30px; color: var(--color-muted); }
.feature-list li::before { content: "✓"; position: absolute; left: 0; top: 0; color: var(--color-blue); font-weight: 900; }

.process { counter-reset: process; display: grid; gap: 16px; }
.process-item { position: relative; display: grid; grid-template-columns: 56px minmax(0,1fr); gap: 18px; padding: 24px; border-radius: 24px; background: rgba(255,255,255,.06); border: 1px solid rgba(255,255,255,.11); }
.process-item::before { counter-increment: process; content: counter(process); width: 56px; height: 56px; display: grid; place-items: center; border-radius: 18px; background: linear-gradient(135deg, var(--color-sky), var(--color-blue)); color: #fff; font-weight: 900; box-shadow: 0 14px 28px rgba(37,99,235,.26); }
.process-item h3 { font-size: 22px; margin: 0 0 7px; }
.process-item p { margin: 0; color: #bbcae2; }

.partner { position: relative; overflow: hidden; border-radius: 36px; background: linear-gradient(130deg, rgba(7,20,38,.95), rgba(18,50,86,.91)), url('../img/partner-meeting.webp') center/cover; color: #fff; padding: 64px; box-shadow: var(--shadow-card); }
.partner::before { content: ""; position: absolute; inset: 0; background: radial-gradient(circle at 14% 18%, rgba(14,165,233,.36), transparent 30%), radial-gradient(circle at 82% 82%, rgba(37,99,235,.28), transparent 32%); }
.partner > * { position: relative; z-index: 1; }
.partner-grid { display: grid; grid-template-columns: minmax(0, .9fr) minmax(320px, .6fr); gap: 46px; align-items: end; }
.partner-tags { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 26px; }
.tag { padding: 10px 13px; border: 1px solid rgba(255,255,255,.18); background: rgba(255,255,255,.08); border-radius: 999px; color: #e9f6ff; font-weight: 750; font-size: 14px; }
.contact-panel { border-radius: 36px; background: #fff; color: var(--color-text); padding: 34px; box-shadow: 0 20px 60px rgba(0,0,0,.20); }
.contact-panel a { color: var(--color-blue); font-weight: 900; }

.contact-grid { display: grid; grid-template-columns: minmax(0, .8fr) minmax(360px, .64fr); gap: 40px; align-items: start; }
.contact-card { padding: 34px; border-radius: var(--radius-xl); background: #fff; box-shadow: var(--shadow-card); border: 1px solid rgba(220,231,245,.9); }
.contact-item { padding: 20px 0; border-top: 1px solid var(--color-line); }
.contact-item:first-of-type { border-top: 0; padding-top: 0; }
.contact-item small { display: block; color: var(--color-muted); font-weight: 850; text-transform: uppercase; letter-spacing: .08em; margin-bottom: 5px; }
.contact-item a, .contact-item strong { color: var(--color-text); font-size: 18px; font-weight: 900; }

.faq { display: grid; gap: 14px; }
details { border: 1px solid var(--color-line); border-radius: 20px; background: #fff; padding: 0 22px; }
summary { cursor: pointer; padding: 22px 0; font-weight: 900; }
details p { color: var(--color-muted); padding-bottom: 22px; margin-bottom: 0; }

.site-footer { background: #06101f; color: #d4e2f3; padding: 48px 0 34px; }
.footer-grid { display: grid; grid-template-columns: minmax(220px, .5fr) minmax(0, 1fr); gap: 36px; align-items: start; }
.footer-logo { width: 178px; margin-bottom: 18px; }
.footer-links { display: flex; justify-content: flex-end; gap: 22px; flex-wrap: wrap; }
.footer-links a { color: #d4e2f3; }
.copyright { margin: 24px 0 0; color: #8798b3; font-size: 14px; }

.page-hero { min-height: 640px; padding: 150px 0 104px; color: #fff; display: flex; align-items: center; background: var(--color-navy); position: relative; isolation: isolate; overflow: hidden; }
.page-hero::before { content: ""; position: absolute; inset: 0; z-index: -2; background: linear-gradient(100deg, rgba(7,20,38,.92), rgba(7,20,38,.55)), var(--page-bg, url('../img/roamingmate-esim.webp')) center/cover; }
.page-hero::after { content: ""; position: absolute; inset: 0; z-index: -1; background: radial-gradient(circle at 76% 20%, rgba(14,165,233,.32), transparent 34%); }
.page-hero h1 { max-width: 940px; }
.page-hero .lead { color: #dbeafe; }
.breadcrumb { display: flex; gap: 10px; align-items: center; color: #b9c8df; font-weight: 780; margin-bottom: 24px; }
.breadcrumb a { color: #eaf6ff; }

.split { display: grid; grid-template-columns: minmax(0, .9fr) minmax(0, .72fr); gap: 54px; align-items: center; }
.region-grid { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 14px; }
.region { padding: 18px; border-radius: 20px; background: #fff; box-shadow: 0 10px 24px rgba(7,20,38,.05); border: 1px solid rgba(220,231,245,.9); font-weight: 900; }
.region small { display: block; color: var(--color-muted); font-weight: 700; margin-top: 4px; }

.reveal { opacity: 0; transform: translateY(24px); transition: opacity .7s ease, transform .7s ease; }
.reveal.is-visible { opacity: 1; transform: none; }

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { scroll-behavior: auto !important; transition: none !important; animation: none !important; }
  .reveal { opacity: 1; transform: none; }
}

@media (max-width: 1024px) {
  .section { padding: 86px 0; }
  .hero { min-height: 860px; padding: 132px 0 96px; }
  .page-hero { min-height: 600px; padding: 128px 0 92px; }
  .hero + .section, .page-hero + .section { padding-top: 112px; }
  .section-head, .about-layout, .service-showcase, .partner-grid, .contact-grid, .split { grid-template-columns: 1fr; }
  .service-showcase { gap: 32px; }
  .grid-3 { grid-template-columns: 1fr 1fr; }
  .image-panel { min-height: 420px; }
  .partner { padding: 44px; }
  .region-grid { grid-template-columns: repeat(2, minmax(0,1fr)); }
}

@media (max-width: 820px) {
  .site-header { padding: 12px 0; }
  .navbar { position: relative; }
  .navbar > nav { display: contents; }
  .nav-toggle { display: inline-flex; flex-direction: column; align-items: center; justify-content: center; flex: 0 0 44px; margin-left: auto; }
  .nav-menu {
    position: fixed; left: 20px; right: 20px; top: 72px; display: none; flex-direction: column; align-items: stretch; gap: 6px;
    padding: 14px; border-radius: 24px; background: rgba(255,255,255,.96); box-shadow: 0 20px 70px rgba(7,20,38,.18); backdrop-filter: blur(16px);
  }
  .nav-menu.is-open { display: flex; }
  .nav-menu a { color: var(--color-text); justify-content: center; min-height: 48px; }
  .nav-action { display: none; }
  .hero { min-height: auto; padding: 128px 0 88px; }
  .hero-content { padding-top: 0; }
  .hero-metrics, .grid-3, .grid-2, .stats { grid-template-columns: 1fr; }
  .value-row { grid-template-columns: 1fr; gap: 8px; }
  .contact-grid { gap: 24px; }
  .footer-grid { grid-template-columns: 1fr; }
  .footer-links { justify-content: flex-start; }
}

@media (max-width: 540px) {
  .container { width: min(100% - 28px, var(--container)); }
  .hero { min-height: auto; padding: 120px 0 76px; }
  .hero-metrics { margin-top: 40px; }
  .metric-card, .card, .service-card, .contact-card { padding: 24px; }
  .partner { padding: 32px 22px; border-radius: 28px; }
  .page-hero { min-height: auto; padding: 112px 0 76px; }
  .hero + .section, .page-hero + .section { padding-top: 84px; }
  .region-grid { grid-template-columns: 1fr; }
  .image-caption { left: 16px; right: 16px; bottom: 16px; padding: 16px; }
}