:root {
  --bg: #f4f6f8;
  --bg-elev: #ffffff;
  --ink: #132033;
  --ink-soft: #3d4f63;
  --line: #d5dde6;
  --navy: #0b1f33;
  --navy-2: #16324d;
  --accent: #1f6f8b;
  --accent-soft: #e8f3f7;
  --ok: #1f7a4d;
  --ok-bg: #e8f6ee;
  --warn: #8a6a1a;
  --warn-bg: #f8f1db;
  --muted: #5c6b7a;
  --radius: 10px;
  --shadow: 0 1px 2px rgba(19, 32, 51, 0.06), 0 8px 24px rgba(19, 32, 51, 0.06);
  --max: 1120px;
  --font: "IBM Plex Sans", "Noto Sans KR", "Apple SD Gothic Neo", "Malgun Gothic", sans-serif;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font);
  color: var(--ink);
  background: var(--bg);
  line-height: 1.55;
  min-width: 320px;
}

a {
  color: var(--accent);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

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

.wrap {
  width: min(100% - 2rem, var(--max));
  margin-inline: auto;
}

/* Header */
.site-header {
  background: var(--navy);
  color: #eef3f7;
  position: sticky;
  top: 0;
  z-index: 20;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.9rem 0;
}

.brand {
  display: flex;
  flex-direction: column;
  gap: 0.1rem;
  color: inherit;
  text-decoration: none;
}

.brand:hover {
  text-decoration: none;
}

.brand-name {
  font-size: 1.05rem;
  font-weight: 700;
  letter-spacing: 0.01em;
}

.brand-sub {
  font-size: 0.78rem;
  color: rgba(238, 243, 247, 0.72);
}

.nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem 1rem;
  align-items: center;
}

.nav a {
  color: rgba(238, 243, 247, 0.88);
  font-size: 0.92rem;
  text-decoration: none;
}

.nav a:hover {
  color: #fff;
  text-decoration: none;
}

.nav-toggle {
  display: none;
  background: transparent;
  border: 1px solid rgba(255, 255, 255, 0.25);
  color: #fff;
  border-radius: 6px;
  padding: 0.4rem 0.65rem;
  font: inherit;
  cursor: pointer;
}

/* Hero */
.hero {
  background:
    linear-gradient(180deg, rgba(11, 31, 51, 0.04), transparent 55%),
    var(--bg);
  padding: 3.2rem 0 2.4rem;
  border-bottom: 1px solid var(--line);
}

.hero-grid {
  display: grid;
  gap: 1.75rem;
}

.eyebrow {
  display: inline-block;
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 0.65rem;
}

.hero h1 {
  margin: 0 0 0.85rem;
  font-size: clamp(1.7rem, 3.4vw, 2.45rem);
  line-height: 1.25;
  color: var(--navy);
  max-width: 18ch;
}

.hero-lead {
  margin: 0 0 1.4rem;
  color: var(--ink-soft);
  max-width: 42rem;
  font-size: 1.05rem;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.7rem;
  align-items: center;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  min-height: 2.7rem;
  padding: 0.65rem 1.15rem;
  border-radius: 8px;
  border: 1px solid transparent;
  font: inherit;
  font-weight: 600;
  cursor: pointer;
  text-decoration: none;
}

.btn:hover {
  text-decoration: none;
}

.btn-primary {
  background: var(--navy);
  color: #fff;
}

.btn-primary:hover {
  background: var(--navy-2);
}

.btn-secondary {
  background: var(--bg-elev);
  color: var(--navy);
  border-color: var(--line);
}

.btn-secondary:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.btn[disabled],
.btn.is-disabled {
  opacity: 0.55;
  cursor: not-allowed;
  pointer-events: none;
}

.btn-note {
  font-size: 0.86rem;
  color: var(--muted);
}

/* Sections */
.section {
  padding: 2.6rem 0;
}

.section + .section {
  border-top: 1px solid var(--line);
}

.section h2 {
  margin: 0 0 0.45rem;
  font-size: 1.45rem;
  color: var(--navy);
}

.section-lead {
  margin: 0 0 1.4rem;
  color: var(--ink-soft);
  max-width: 48rem;
}

.cards {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 0.9rem;
}

.card {
  background: var(--bg-elev);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1rem 1.05rem;
  box-shadow: var(--shadow);
}

.card h3 {
  margin: 0 0 0.55rem;
  font-size: 0.98rem;
  color: var(--navy);
}

.card p {
  margin: 0.45rem 0 0;
  font-size: 0.88rem;
  color: var(--muted);
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.22rem 0.55rem;
  border-radius: 999px;
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.01em;
}

.badge::before {
  content: "";
  width: 0.45rem;
  height: 0.45rem;
  border-radius: 50%;
  background: currentColor;
}

.badge-online {
  color: var(--ok);
  background: var(--ok-bg);
}

.badge-pending {
  color: var(--warn);
  background: var(--warn-bg);
}

.status-meta {
  margin-top: 0.9rem;
  font-size: 0.84rem;
  color: var(--muted);
}

.steps {
  counter-reset: step;
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.75rem;
}

.steps li {
  counter-increment: step;
  background: var(--bg-elev);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 0.95rem 1rem 0.95rem 3.2rem;
  position: relative;
  box-shadow: var(--shadow);
}

.steps li::before {
  content: counter(step);
  position: absolute;
  left: 0.9rem;
  top: 0.95rem;
  width: 1.55rem;
  height: 1.55rem;
  border-radius: 50%;
  background: var(--accent-soft);
  color: var(--accent);
  font-weight: 700;
  font-size: 0.85rem;
  display: grid;
  place-items: center;
}

.note {
  margin-top: 1rem;
  padding: 0.85rem 1rem;
  background: var(--accent-soft);
  border-left: 3px solid var(--accent);
  border-radius: 0 8px 8px 0;
  color: var(--ink-soft);
  font-size: 0.92rem;
}

.security-list {
  margin: 0;
  padding-left: 1.15rem;
  color: var(--ink-soft);
}

.security-list li + li {
  margin-top: 0.45rem;
}

.download-box {
  background: var(--bg-elev);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1.2rem;
  box-shadow: var(--shadow);
}

.download-box h3 {
  margin: 0 0 0.4rem;
  font-size: 1.05rem;
}

.download-empty {
  color: var(--muted);
  margin: 0.6rem 0 0;
}

.site-footer {
  background: var(--navy);
  color: rgba(238, 243, 247, 0.82);
  padding: 1.6rem 0;
  margin-top: 1rem;
}

.footer-inner {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 0.75rem;
  font-size: 0.88rem;
}

.footer-inner a {
  color: rgba(238, 243, 247, 0.9);
}

.privacy-note {
  margin-top: 0.7rem;
  font-size: 0.82rem;
  color: rgba(238, 243, 247, 0.65);
  max-width: 46rem;
}

@media (max-width: 960px) {
  .cards {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 720px) {
  .nav-toggle {
    display: inline-flex;
  }

  .nav {
    display: none;
    width: 100%;
    flex-direction: column;
    align-items: flex-start;
    padding: 0.4rem 0 0.8rem;
  }

  .nav.is-open {
    display: flex;
  }

  .header-inner {
    flex-wrap: wrap;
  }

  .cards {
    grid-template-columns: 1fr;
  }

  .hero {
    padding-top: 2.2rem;
  }
}