/* IEUM (이음) — shared styles
   Design system: trust blue + orange CTA, clean B2B SaaS, light theme */

:root {
  --color-primary: #2563EB;
  --color-primary-dark: #1D4ED8;
  --color-on-primary: #FFFFFF;
  --color-secondary: #3B82F6;
  --color-accent: #EA580C;
  --color-accent-dark: #C2410C;
  --color-on-accent: #FFFFFF;
  --color-background: #F8FAFC;
  --color-foreground: #1E293B;
  --color-card: #FFFFFF;
  --color-card-foreground: #1E293B;
  --color-muted: #E9EFF8;
  --color-muted-foreground: #475569;
  --color-border: #E2E8F0;
  --color-destructive: #DC2626;

  --radius-sm: 8px;
  --radius: 12px;
  --radius-lg: 20px;
  --shadow-sm: 0 1px 2px rgba(15, 23, 42, 0.06);
  --shadow: 0 10px 30px -12px rgba(15, 23, 42, 0.18);
  --shadow-lg: 0 24px 48px -20px rgba(15, 23, 42, 0.22);

  --container: 1160px;
  --transition: 180ms ease;
}

* { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  font-family: 'Plus Jakarta Sans', 'Noto Sans KR', 'Noto Sans SC',
    -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  font-size: 16px;
  line-height: 1.65;
  color: var(--color-foreground);
  background: var(--color-background);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

/* Language-specific font hint (Latin first for Korean fallback) */
html[lang="ko"] body { font-family: 'Noto Sans KR', 'Plus Jakarta Sans', 'Noto Sans SC', sans-serif; }
html[lang="zh"] body { font-family: 'Noto Sans SC', 'Noto Sans KR', 'Plus Jakarta Sans', sans-serif; }

h1, h2, h3, h4, h5 {
  margin: 0 0 0.4em;
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -0.01em;
  color: var(--color-foreground);
}

h1 { font-size: clamp(2rem, 5vw, 3rem); }
h2 { font-size: clamp(1.5rem, 3.4vw, 2.1rem); }
h3 { font-size: 1.25rem; }

p { margin: 0 0 1em; }

a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color var(--transition);
}
a:hover { color: var(--color-primary-dark); }

img, svg { display: block; max-width: 100%; }

.container {
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px;
}

:focus-visible {
  outline: 3px solid var(--color-primary);
  outline-offset: 2px;
  border-radius: 4px;
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 22px;
  border-radius: 999px;
  border: 1px solid transparent;
  font-weight: 600;
  font-size: 0.95rem;
  line-height: 1;
  cursor: pointer;
  text-decoration: none;
  transition: background var(--transition), color var(--transition),
    border-color var(--transition), transform var(--transition), box-shadow var(--transition);
  white-space: nowrap;
}
.btn-primary {
  background: var(--color-primary);
  color: var(--color-on-primary);
}
.btn-primary:hover {
  background: var(--color-primary-dark);
  color: var(--color-on-primary);
  box-shadow: var(--shadow);
  transform: translateY(-1px);
}
.btn-accent {
  background: var(--color-accent);
  color: var(--color-on-accent);
}
.btn-accent:hover {
  background: var(--color-accent-dark);
  color: var(--color-on-accent);
  box-shadow: var(--shadow);
  transform: translateY(-1px);
}
.btn-ghost {
  background: transparent;
  color: var(--color-foreground);
  border-color: var(--color-border);
}
.btn-ghost:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
}

/* ---------- Header / Nav ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(248, 250, 252, 0.82);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--color-border);
}
.header-inner {
  display: flex;
  align-items: center;
  gap: 24px;
  height: 68px;
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--color-foreground);
  font-weight: 800;
  font-size: 1.25rem;
  letter-spacing: -0.02em;
}
.brand:hover { color: var(--color-primary); }
.brand-mark {
  display: grid;
  place-items: center;
  width: 34px;
  height: 34px;
  border-radius: 10px;
  background: var(--color-primary);
  color: #fff;
  flex: none;
}
.brand-mark svg { width: 20px; height: 20px; }

.nav { margin-left: auto; }
.nav-list {
  display: flex;
  align-items: center;
  gap: 4px;
  list-style: none;
  margin: 0;
  padding: 0;
}
.nav-list a {
  display: inline-flex;
  align-items: center;
  padding: 9px 14px;
  border-radius: 8px;
  color: var(--color-muted-foreground);
  font-weight: 500;
  font-size: 0.95rem;
}
.nav-list a:hover { color: var(--color-foreground); background: var(--color-muted); }
.nav-list a[aria-current="page"] { color: var(--color-primary); font-weight: 600; }

.header-actions { display: flex; align-items: center; gap: 10px; }

.lang-switch {
  display: inline-flex;
  align-items: center;
  gap: 2px;
  padding: 3px;
  border: 1px solid var(--color-border);
  border-radius: 999px;
  background: #fff;
}
.lang-btn {
  border: none;
  background: transparent;
  padding: 6px 12px;
  border-radius: 999px;
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--color-muted-foreground);
  cursor: pointer;
  transition: background var(--transition), color var(--transition);
}
.lang-btn.is-active {
  background: var(--color-primary);
  color: #fff;
}
.lang-btn:not(.is-active):hover { color: var(--color-foreground); }

.nav-toggle {
  display: none;
  width: 44px;
  height: 44px;
  border: 1px solid var(--color-border);
  background: #fff;
  border-radius: 10px;
  cursor: pointer;
  place-items: center;
}
.nav-toggle svg { width: 22px; height: 22px; }

/* ---------- Hero ---------- */
.hero {
  position: relative;
  overflow: hidden;
  background:
    radial-gradient(1200px 500px at 80% -10%, rgba(37, 99, 235, 0.14), transparent 60%),
    radial-gradient(900px 420px at 10% 110%, rgba(234, 88, 12, 0.12), transparent 55%),
    var(--color-background);
}
.hero-inner {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 48px;
  align-items: center;
  padding: 72px 24px 88px;
}
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 14px;
  border-radius: 999px;
  background: rgba(37, 99, 235, 0.09);
  color: var(--color-primary);
  font-weight: 600;
  font-size: 0.82rem;
  margin-bottom: 20px;
}
.hero h1 { margin-bottom: 16px; }
.hero-lead {
  font-size: 1.15rem;
  color: var(--color-muted-foreground);
  max-width: 34em;
  margin-bottom: 28px;
}
.hero-cta { display: flex; flex-wrap: wrap; gap: 14px; }
.hero-stats {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 40px;
}
.stat {
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 14px 20px;
  min-width: 120px;
  box-shadow: var(--shadow-sm);
}
.stat b { display: block; font-size: 1.4rem; color: var(--color-primary); line-height: 1.1; }
.stat span { font-size: 0.82rem; color: var(--color-muted-foreground); }

.hero-visual {
  position: relative;
  display: grid;
  place-items: center;
}
.hero-card {
  width: 100%;
  max-width: 460px;
  background: rgba(255, 255, 255, 0.72);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid rgba(255, 255, 255, 0.6);
  box-shadow: var(--shadow-lg);
  border-radius: var(--radius-lg);
  padding: 28px;
}
.hero-card h3 { font-size: 1.05rem; }
.hero-rows { display: grid; gap: 12px; margin-top: 16px; }
.hero-row {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 14px;
  border-radius: var(--radius);
  background: #fff;
  border: 1px solid var(--color-border);
}
.hero-row .dot {
  width: 10px; height: 10px; border-radius: 50%;
  background: #16A34A; flex: none;
}
.hero-row b { display: block; font-size: 0.92rem; }
.hero-row span { font-size: 0.8rem; color: var(--color-muted-foreground); }

/* ---------- Sections ---------- */
.section { padding: 72px 0; }
.section-alt { background: #fff; border-top: 1px solid var(--color-border); border-bottom: 1px solid var(--color-border); }
.section-head { max-width: 660px; margin-bottom: 40px; }
.section-head.center { margin-left: auto; margin-right: auto; text-align: center; }
.section-head p { color: var(--color-muted-foreground); font-size: 1.05rem; }

.grid { display: grid; gap: 20px; }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }
.grid-2 { grid-template-columns: repeat(2, 1fr); }

.card {
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 26px;
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
}
a.card { color: inherit; display: flex; flex-direction: column; }
a.card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow);
  border-color: rgba(37, 99, 235, 0.4);
  color: inherit;
}
.card-icon {
  display: grid;
  place-items: center;
  width: 48px;
  height: 48px;
  border-radius: 12px;
  background: rgba(37, 99, 235, 0.1);
  color: var(--color-primary);
  margin-bottom: 16px;
}
.card-icon svg { width: 26px; height: 26px; }
.card h3 { font-size: 1.1rem; }
.card p { color: var(--color-muted-foreground); font-size: 0.94rem; margin-bottom: 0; }
.card-link {
  display: inline-flex; align-items: center; gap: 6px;
  margin-top: auto; padding-top: 16px;
  font-weight: 600; font-size: 0.9rem; color: var(--color-primary);
}
.card-link svg { width: 16px; height: 16px; }
a.card:hover .card-link { color: var(--color-primary-dark); }

/* Feature list rows */
.feature-list { display: grid; gap: 18px; }
.feature {
  display: flex; gap: 16px; align-items: flex-start;
  padding: 20px; border-radius: var(--radius);
  background: #fff; border: 1px solid var(--color-border);
}
.feature .card-icon { margin-bottom: 0; flex: none; }
.feature h3 { font-size: 1.05rem; }
.feature p { margin: 0; color: var(--color-muted-foreground); font-size: 0.94rem; }

/* ---------- CTA band ---------- */
.cta-band {
  background: linear-gradient(120deg, var(--color-primary), #3B82F6);
  color: #fff;
  border-radius: var(--radius-lg);
  padding: 48px 40px;
  text-align: center;
}
.cta-band h2 { color: #fff; }
.cta-band p { color: rgba(255, 255, 255, 0.9); max-width: 40em; margin: 0 auto 24px; }
.cta-band .btn-accent { background: #fff; color: var(--color-primary); }
.cta-band .btn-accent:hover { background: #f1f5f9; color: var(--color-primary-dark); }

/* ---------- Page header (interior) ---------- */
.page-hero {
  background:
    radial-gradient(900px 360px at 85% -20%, rgba(37, 99, 235, 0.12), transparent 60%),
    var(--color-background);
  border-bottom: 1px solid var(--color-border);
}
.page-hero-inner { padding: 56px 24px; max-width: var(--container); margin: 0 auto; }
.page-hero h1 { margin-bottom: 12px; }
.page-hero p { color: var(--color-muted-foreground); font-size: 1.1rem; max-width: 44em; margin: 0; }

.breadcrumb { font-size: 0.84rem; color: var(--color-muted-foreground); margin-bottom: 14px; }
.breadcrumb a { color: var(--color-muted-foreground); }
.breadcrumb a:hover { color: var(--color-primary); }
.breadcrumb .sep { margin: 0 6px; opacity: 0.6; }

/* ---------- Spec table ---------- */
.spec-table { width: 100%; border-collapse: collapse; background: #fff; border: 1px solid var(--color-border); border-radius: var(--radius); overflow: hidden; }
.spec-table th, .spec-table td { text-align: left; padding: 14px 18px; border-bottom: 1px solid var(--color-border); font-size: 0.94rem; vertical-align: top; }
.spec-table th { background: var(--color-muted); color: var(--color-foreground); width: 40%; font-weight: 600; }
.spec-table tr:last-child th, .spec-table tr:last-child td { border-bottom: none; }

/* ---------- Accordion (FAQ) ---------- */
.faq-list { display: grid; gap: 12px; max-width: 820px; }
.faq-item { border: 1px solid var(--color-border); border-radius: var(--radius); background: #fff; overflow: hidden; }
.faq-q {
  width: 100%; display: flex; justify-content: space-between; align-items: center; gap: 16px;
  padding: 18px 20px; background: #fff; border: none; cursor: pointer;
  font: inherit; font-weight: 600; font-size: 1rem; color: var(--color-foreground); text-align: left;
}
.faq-q:hover { color: var(--color-primary); }
.faq-q .chev { flex: none; color: var(--color-muted-foreground); transition: transform var(--transition); }
.faq-item[open] .chev { transform: rotate(180deg); }
.faq-a { padding: 0 20px 20px; color: var(--color-muted-foreground); font-size: 0.96rem; }
.faq-a p { margin: 0; }

/* ---------- Footer ---------- */
.site-footer {
  background: var(--color-foreground);
  color: #cbd5e1;
  padding: 56px 0 0;
  margin-top: 40px;
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1fr;
  gap: 32px;
  padding-bottom: 40px;
}
.site-footer .brand { color: #fff; }
.site-footer .brand:hover { color: #fff; }
.footer-brand p { color: #94a3b8; font-size: 0.9rem; max-width: 30em; }
.footer-col h4 { color: #fff; font-size: 0.9rem; text-transform: uppercase; letter-spacing: 0.04em; margin-bottom: 14px; }
.footer-col ul { list-style: none; margin: 0; padding: 0; display: grid; gap: 8px; }
.footer-col a { color: #94a3b8; font-size: 0.9rem; }
.footer-col a:hover { color: #fff; }
.footer-bottom {
  border-top: 1px solid rgba(148, 163, 184, 0.2);
  padding: 20px 0;
  text-align: center;
  color: #64748b;
  font-size: 0.84rem;
}

/* ---------- Responsive ---------- */
@media (max-width: 900px) {
  .hero-inner { grid-template-columns: 1fr; padding-top: 48px; padding-bottom: 56px; }
  .hero-visual { order: -1; }
  .grid-4, .grid-3 { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 720px) {
  .nav-toggle { display: grid; }
  .nav {
    position: absolute;
    top: 68px; left: 0; right: 0;
    background: #fff;
    border-bottom: 1px solid var(--color-border);
    box-shadow: var(--shadow);
    display: none;
  }
  .nav.open { display: block; }
  .nav-list { flex-direction: column; align-items: stretch; padding: 8px; gap: 2px; }
  .nav-list a { padding: 12px 14px; }
  .header-actions { margin-left: auto; }
  .grid-4, .grid-3, .grid-2 { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; gap: 24px; }
  .cta-band { padding: 36px 22px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { transition-duration: 0.01ms !important; animation-duration: 0.01ms !important; }
}


/* ---------- Motion helpers ---------- */
html.js-motion .reveal { opacity: 0; transform: translateY(24px); transition: opacity .65s ease, transform .65s cubic-bezier(.22,1,.36,1); }
html.js-motion .reveal.is-visible { opacity: 1; transform: none; }
.site-header.is-scrolled { box-shadow: var(--shadow-sm); }
@keyframes ieum-float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-10px); }
}
.hero-visual { animation: ieum-float 8s ease-in-out infinite; }

/* ---------- Mobile IP pricing ---------- */
.price-range-pill {
  display: inline-flex; align-items: baseline; gap: 6px; margin-top: 18px;
  padding: 8px 15px; border-radius: 999px; background: var(--color-card);
  border: 1px solid var(--color-border); box-shadow: var(--shadow-sm);
  color: var(--color-muted-foreground); font-size: .84rem; font-weight: 600;
}
.price-range-pill b { color: var(--color-primary); font-size: 1.05rem; letter-spacing: -.02em; }
.price-range-pill small { font-weight: 500; }

.pricing-band { background: linear-gradient(180deg, #fff 0%, var(--color-background) 100%); border-block: 1px solid var(--color-border); }
.pricing-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 24px; align-items: stretch; margin-top: 36px; }
.pricing-card {
  position: relative; display: flex; flex-direction: column; background: var(--color-card);
  border: 1px solid var(--color-border); border-radius: var(--radius-lg); padding: 32px;
  box-shadow: var(--shadow-sm); transition: transform .3s ease, box-shadow .3s ease, border-color .3s ease;
}
.pricing-card::before {
  content: ""; position: absolute; inset: 0 0 auto 0; height: 4px; border-radius: var(--radius-lg) var(--radius-lg) 0 0;
  background: linear-gradient(90deg, var(--color-primary), var(--color-secondary));
}
.pricing-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-lg); }
.pricing-card--featured { border-color: rgba(37, 99, 235, .45); box-shadow: 0 18px 44px -26px rgba(37, 99, 235, .5); }
.pricing-card--featured::before { background: linear-gradient(90deg, var(--color-accent), #f59e0b); }
.pricing-tag {
  align-self: flex-start; padding: 5px 11px; margin-bottom: 12px; border-radius: 999px;
  background: var(--color-muted); color: var(--color-primary);
  font-size: .74rem; font-weight: 700; letter-spacing: .06em; text-transform: uppercase;
}
.pricing-card--featured .pricing-tag { background: #fff1e8; color: var(--color-accent); }
.pricing-card h3 { font-size: 1.28rem; margin-bottom: 4px; }
.price-range { display: flex; align-items: baseline; gap: 3px; margin: 6px 0 14px; color: var(--color-foreground); }
.price-range b { font-size: clamp(2.8rem, 5.2vw, 3.9rem); line-height: .95; letter-spacing: -.045em; }
.price-currency { align-self: flex-start; margin-top: 8px; font-size: 1.3rem; font-weight: 700; }
.price-unit { color: var(--color-muted-foreground); font-size: .94rem; font-weight: 600; }
.price-from { color: var(--color-muted-foreground); font-size: .76rem; font-weight: 700; letter-spacing: .08em; text-transform: uppercase; margin-right: 2px; }
.pricing-card p { color: var(--color-muted-foreground); font-size: .95rem; }
.price-list { list-style: none; margin: 0 0 24px; padding: 0; display: grid; gap: 9px; }
.price-list li { position: relative; padding-left: 24px; color: var(--color-muted-foreground); font-size: .93rem; }
.price-list li::before {
  content: ""; position: absolute; left: 0; top: .58em; width: 10px; height: 10px; border-radius: 50%;
  background: var(--color-primary); box-shadow: 0 0 0 4px rgba(37, 99, 235, .12);
}
.pricing-card--featured .price-list li::before { background: var(--color-accent); box-shadow: 0 0 0 4px rgba(234, 88, 12, .12); }
.btn-block { width: 100%; margin-top: auto; justify-content: center; }
.pricing-note { max-width: 760px; margin: 22px auto 0; text-align: center; color: var(--color-muted-foreground); font-size: .88rem; }
@media (max-width: 760px) {
  .pricing-grid { grid-template-columns: 1fr; }
  .pricing-card { padding: 26px 22px; }
}
@media (prefers-reduced-motion: reduce) {
  html.js-motion .reveal { opacity: 1; transform: none; transition: none; }
  .hero-visual { animation: none; }
  .pricing-card { transition: none; }
  .pricing-card:hover { transform: none; }
}