:root {
  color-scheme: dark;
  --bg: #0f172a;
  --bg-deep: #0a1020;
  --surface: #172238;
  --surface-2: #1d2a42;
  --text: #f8fafc;
  --sub: #a8b3c5;
  --line: rgba(148, 163, 184, 0.22);
  --primary: #00a3ff;
  --primary-strong: #078bd4;
  --primary-soft: rgba(0, 163, 255, 0.14);
  --success: #35d0a3;
  --radius: 20px;
  --shadow: 0 20px 55px rgba(0, 0, 0, 0.26);
  --container: 1120px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  min-width: 320px;
  background: var(--bg);
  color: var(--text);
  font-family: Pretendard, "Noto Sans KR", "Apple SD Gothic Neo", "Malgun Gothic", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
body.menu-open { overflow: hidden; }
a { color: inherit; text-decoration: none; }
button, input, textarea, select { font: inherit; }
img { display: block; max-width: 100%; }
ul { margin: 0; padding: 0; }

.container {
  width: min(calc(100% - 40px), var(--container));
  margin-inline: auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  border-bottom: 1px solid var(--line);
  background: rgba(15, 23, 42, 0.88);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
}
.header-inner {
  min-height: 76px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}
.brand {
  display: inline-flex;
  align-items: baseline;
  gap: 9px;
  flex-shrink: 0;
  letter-spacing: -0.02em;
}
.brand b { font-size: 1.32rem; }
.brand span {
  color: var(--primary);
  font-size: 0.68rem;
  font-weight: 900;
  letter-spacing: 0.16em;
}
.desktop-nav ul,
.footer-links {
  display: flex;
  align-items: center;
  gap: 7px;
  list-style: none;
}
.desktop-nav a,
.footer-links a {
  display: inline-flex;
  min-height: 44px;
  align-items: center;
  padding: 0 14px;
  border-radius: 12px;
  color: var(--sub);
  font-size: 0.95rem;
  font-weight: 700;
  transition: background-color .18s ease, color .18s ease;
}
.desktop-nav a:hover,
.desktop-nav a:focus-visible,
.desktop-nav a[aria-current="page"],
.footer-links a:hover,
.footer-links a:focus-visible {
  color: var(--text);
  background: var(--primary-soft);
}
.header-actions {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 9px;
}
.button {
  min-height: 46px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 0 18px;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: rgba(255, 255, 255, 0.035);
  color: var(--text);
  font-weight: 800;
  cursor: pointer;
  transition: transform .18s ease, background-color .18s ease, border-color .18s ease;
}
.button:hover,
.button:focus-visible {
  transform: translateY(-1px);
  border-color: rgba(0, 163, 255, 0.65);
  background: rgba(0, 163, 255, 0.09);
  outline: none;
}
.button.primary {
  border-color: transparent;
  background: var(--primary);
  color: #04121e;
  box-shadow: 0 12px 28px rgba(0, 163, 255, 0.26);
}
.button.primary:hover,
.button.primary:focus-visible { background: #36b5ff; }
.menu-button {
  display: none;
  width: 46px;
  padding: 0;
  font-size: 1.26rem;
}
.mobile-nav {
  display: none;
  border-top: 1px solid var(--line);
  background: var(--bg);
}
.mobile-nav.open { display: block; }
.mobile-nav ul {
  width: min(calc(100% - 40px), var(--container));
  margin: 0 auto;
  padding: 12px 0 18px;
  list-style: none;
}
.mobile-nav a {
  min-height: 50px;
  display: flex;
  align-items: center;
  padding: 0 14px;
  border-radius: 12px;
  color: var(--sub);
  font-weight: 800;
}
.mobile-nav a:hover,
.mobile-nav a:focus-visible { color: var(--text); background: var(--primary-soft); }

.hero {
  position: relative;
  overflow: hidden;
  border-bottom: 1px solid var(--line);
  background:
    radial-gradient(circle at 50% 0%, rgba(0, 163, 255, .19), transparent 35%),
    linear-gradient(180deg, var(--bg-deep) 0%, var(--bg) 100%);
}
.hero::before,
.page-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  opacity: .32;
  background-image:
    linear-gradient(rgba(255,255,255,.025) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,.025) 1px, transparent 1px);
  background-size: 36px 36px;
  mask-image: linear-gradient(to bottom, black, transparent 82%);
}
.hero-inner {
  position: relative;
  z-index: 1;
  min-height: 610px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 110px 0 118px;
  text-align: center;
}
.eyebrow,
.section-label,
.tag {
  display: inline-flex;
  align-items: center;
  width: fit-content;
  border-radius: 999px;
  font-size: .78rem;
  font-weight: 900;
  letter-spacing: .08em;
}
.eyebrow {
  padding: 8px 13px;
  border: 1px solid rgba(0, 163, 255, .34);
  background: var(--primary-soft);
  color: #7fd0ff;
}
.hero h1,
.page-hero h1,
.section-heading h2,
.panel h2,
.prose h2 {
  margin: 0;
  line-height: 1.22;
  letter-spacing: -.04em;
}
.hero h1 {
  max-width: 900px;
  margin-top: 25px;
  font-size: clamp(2.4rem, 6vw, 4.85rem);
}
.hero h1 strong { color: var(--primary); }
.hero p {
  max-width: 760px;
  margin: 25px 0 0;
  color: var(--sub);
  font-size: clamp(1rem, 2vw, 1.18rem);
}
.hero-actions {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 34px;
}

.page-hero {
  position: relative;
  overflow: hidden;
  border-bottom: 1px solid var(--line);
  background:
    radial-gradient(circle at 15% 0%, rgba(0,163,255,.18), transparent 32%),
    linear-gradient(180deg, var(--bg-deep), var(--bg));
}
.page-hero .container {
  position: relative;
  z-index: 1;
  padding-top: 105px;
  padding-bottom: 105px;
}
.page-hero h1 {
  margin-top: 20px;
  font-size: clamp(2.45rem, 6vw, 4.5rem);
}
.page-hero p {
  max-width: 760px;
  margin: 20px 0 0;
  color: var(--sub);
  font-size: 1.08rem;
}

.section { padding: 100px 0; }
.section.alt {
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background: rgba(5, 11, 23, .36);
}
.section-heading { margin-bottom: 38px; }
.section-heading.center { text-align: center; }
.section-heading.center .section-label { margin-inline: auto; }
.section-label {
  color: var(--primary);
  letter-spacing: .14em;
}
.section-heading h2,
.panel h2 {
  margin-top: 13px;
  font-size: clamp(1.8rem, 4vw, 2.7rem);
}
.section-heading p {
  max-width: 700px;
  margin: 14px 0 0;
  color: var(--sub);
}
.section-heading.center p { margin-inline: auto; }

.grid2,
.grid3,
.support-grid,
.split {
  display: grid;
  gap: 22px;
}
.grid2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid3,
.support-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.split { grid-template-columns: minmax(0, 1.15fr) minmax(320px, .85fr); align-items: center; gap: 50px; }
.card,
.support-card,
.panel,
.prose {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: linear-gradient(180deg, rgba(29, 42, 66, .92), rgba(20, 31, 51, .92));
  box-shadow: var(--shadow);
}
.card,
.support-card { padding: 30px; }
.card,
.support-card {
  transition: transform .2s ease, border-color .2s ease, background-color .2s ease;
}
.card:hover,
.support-card:hover { transform: translateY(-4px); border-color: rgba(0, 163, 255, .42); }
.tag {
  min-height: 30px;
  padding: 4px 11px;
  background: var(--primary-soft);
  color: #87d4ff;
  letter-spacing: .02em;
}
.card h3,
.support-card h3,
.panel h3 {
  margin: 18px 0 8px;
  font-size: 1.34rem;
  line-height: 1.35;
  letter-spacing: -.025em;
}
.support-card h3 { margin-top: 0; }
.card p,
.support-card p,
.panel p { margin: 0; color: var(--sub); }
.features {
  display: grid;
  gap: 10px;
  margin-top: 22px;
  list-style: none;
}
.features li {
  position: relative;
  padding-left: 25px;
  color: #dbe5f2;
}
.features li::before {
  content: "✓";
  position: absolute;
  left: 0;
  top: 0;
  color: var(--success);
  font-weight: 900;
}
.panel { padding: 34px; }
.panel > :first-child { margin-top: 0; }
.notice {
  margin-top: 26px;
  padding: 17px 19px;
  border: 1px solid rgba(0, 163, 255, .32);
  border-radius: 15px;
  background: var(--primary-soft);
  color: #cbeaff;
  font-weight: 700;
}

.prose {
  max-width: 880px;
  margin-inline: auto;
  padding: clamp(28px, 5vw, 58px);
}
.prose section + section {
  margin-top: 38px;
  padding-top: 38px;
  border-top: 1px solid var(--line);
}
.prose h2 { font-size: 1.45rem; }
.prose p { margin: 13px 0 0; color: var(--sub); }

.footer {
  padding: 38px 0 calc(32px + env(safe-area-inset-bottom));
  background: var(--bg-deep);
  color: var(--sub);
}
.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 30px;
}
.copy {
  margin: 24px 0 0;
  padding-top: 22px;
  border-top: 1px solid var(--line);
  font-size: .88rem;
}

:focus-visible { outline: 3px solid rgba(0, 163, 255, .62); outline-offset: 3px; }

@media (max-width: 900px) {
  .desktop-nav { display: none; }
  .header-actions > .button:not(.menu-button) { display: none; }
  .menu-button { display: inline-flex; }
  .hero-inner { min-height: 560px; padding: 90px 0 96px; }
  .grid3,
  .support-grid { grid-template-columns: 1fr; }
  .split { grid-template-columns: 1fr; gap: 28px; }
}

@media (max-width: 700px) {
  .container { width: min(calc(100% - 28px), var(--container)); }
  .header-inner { min-height: 68px; }
  .brand b { font-size: 1.18rem; }
  .hero-inner { align-items: flex-start; min-height: auto; padding: 78px 0 86px; text-align: left; }
  .hero h1 { font-size: clamp(2.2rem, 12vw, 3.45rem); }
  .hero-actions { justify-content: flex-start; width: 100%; }
  .hero-actions .button { flex: 1 1 190px; }
  .page-hero .container { padding-top: 78px; padding-bottom: 80px; }
  .section { padding: 72px 0; }
  .grid2 { grid-template-columns: 1fr; }
  .card,
  .support-card,
  .panel { padding: 24px; }
  .footer-inner { align-items: flex-start; flex-direction: column; }
  .footer-links { flex-wrap: wrap; gap: 2px; }
}

@media (max-width: 430px) {
  .hero-actions { flex-direction: column; align-items: stretch; }
  .hero-actions .button { flex-basis: auto; width: 100%; }
  .page-hero .hero-actions { flex-direction: column; align-items: stretch; }
  .page-hero .hero-actions .button { width: 100%; }
  .footer-links { align-items: flex-start; flex-direction: column; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { scroll-behavior: auto !important; transition-duration: .01ms !important; animation-duration: .01ms !important; }
}