:root {
  --bg: #06101c;
  --bg-soft: #0c1a2d;
  --card: rgba(255, 255, 255, 0.075);
  --card-strong: rgba(255, 255, 255, 0.11);
  --text: #eef5ff;
  --muted: #9daec5;
  --line: rgba(255, 255, 255, 0.12);
  --primary: #26c6ff;
  --primary-2: #4e6fff;
  --accent: #71f0be;
  --white: #ffffff;
  --shadow: 0 24px 70px rgba(0, 0, 0, 0.42);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: Pretendard, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color: var(--text);
  background: var(--bg);
  word-break: keep-all;
}

a { color: inherit; text-decoration: none; }
.container { width: min(1120px, calc(100% - 40px)); margin: 0 auto; }

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  backdrop-filter: blur(18px);
  background: rgba(7, 17, 31, 0.78);
  border-bottom: 1px solid var(--line);
}
.nav { min-height: 72px; display: flex; align-items: center; justify-content: space-between; gap: 24px; }
.brand { display: inline-flex; align-items: center; gap: 10px; font-weight: 900; letter-spacing: -0.02em; }
.brand-mark {
  width: 36px; height: 36px; display: grid; place-items: center;
  border-radius: 12px; color: #06101d; background: linear-gradient(135deg, var(--primary), var(--accent));
}
.nav-links { display: flex; align-items: center; gap: 24px; color: var(--muted); font-weight: 700; }
.nav-links a:hover { color: var(--white); }
.nav-cta {
  padding: 12px 18px; border: 1px solid rgba(38, 198, 255, 0.35); border-radius: 999px;
  background: rgba(38, 198, 255, 0.1); color: var(--primary); font-weight: 800;
}

.hero { position: relative; overflow: hidden; padding: 110px 0 86px; min-height: 740px; display: flex; align-items: center; background: linear-gradient(180deg, #06101c 0%, #0b1728 100%); }
.hero-grid { position: relative; z-index: 2; display: grid; grid-template-columns: 1.1fr 0.9fr; gap: 56px; align-items: center; }
.eyebrow { margin: 0 0 14px; color: var(--accent); font-weight: 900; letter-spacing: 0.12em; font-size: 13px; text-transform: uppercase; }
h1, h2, h3, p { margin-top: 0; }
h1 { margin-bottom: 18px; font-size: clamp(50px, 8vw, 86px); line-height: 1.04; letter-spacing: -0.07em; }
h1 span { color: transparent; background: linear-gradient(135deg, var(--primary), var(--accent)); -webkit-background-clip: text; background-clip: text; }
h2 { margin-bottom: 18px; font-size: clamp(32px, 5vw, 52px); line-height: 1.1; letter-spacing: -0.055em; }
h3 { margin-bottom: 12px; font-size: 23px; letter-spacing: -0.035em; }
.hero-desc, .lead { color: var(--muted); font-size: 18px; line-height: 1.9; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 14px; margin: 34px 0 18px; }
.hero-note { color: var(--muted); font-size: 15px; }
.btn {
  display: inline-flex; align-items: center; justify-content: center; min-height: 54px; padding: 0 24px;
  border-radius: 16px; font-weight: 900; transition: transform .2s ease, border-color .2s ease, background .2s ease;
}
.btn:hover { transform: translateY(-2px); }
.btn.primary { color: #03101a; background: linear-gradient(135deg, var(--primary), var(--accent)); box-shadow: 0 18px 42px rgba(38, 198, 255, 0.22); }
.btn.ghost { border: 1px solid var(--line); color: var(--text); background: rgba(255,255,255,.05); }
.btn.full { width: 100%; background: var(--white); color: #07111f; }
.btn.light { background: var(--white); color: #07111f; box-shadow: none; }
.hero-card {
  padding: 36px; border: 1px solid rgba(255,255,255,.13); border-radius: 28px;
  background: linear-gradient(180deg, rgba(255,255,255,.11), rgba(255,255,255,.045));
  box-shadow: var(--shadow); backdrop-filter: blur(16px);
}
.hero-card p { color: var(--muted); line-height: 1.75; }
.status-dot { display: inline-flex; align-items: center; gap: 8px; padding: 9px 13px; margin-bottom: 28px; border-radius: 999px; background: rgba(115, 255, 191, .12); color: var(--accent); font-weight: 800; font-size: 14px; }
.status-dot span { width: 9px; height: 9px; border-radius: 50%; background: var(--accent); box-shadow: 0 0 0 7px rgba(115,255,191,.12); }
.contact-box { margin: 28px 0; padding: 28px; border-radius: 22px; background: rgba(38, 198, 255, .1); border: 1px solid rgba(38, 198, 255, .22); }
.contact-box small { display: block; color: var(--muted); margin-bottom: 8px; }
.contact-box strong { font-size: 34px; letter-spacing: -0.04em; color: var(--primary); }
.hero-bg { position: absolute; border-radius: 999px; filter: blur(18px); opacity: .55; }
.hero-bg.one { width: 470px; height: 470px; right: -130px; top: 80px; background: radial-gradient(circle, rgba(38,198,255,.36), transparent 68%); }
.hero-bg.two { width: 560px; height: 560px; left: -180px; bottom: -180px; background: radial-gradient(circle, rgba(113,240,190,.18), transparent 70%); }

.demo-strip { padding: 24px 0; background: linear-gradient(90deg, rgba(38,198,255,.13), rgba(113,240,190,.08)); border-block: 1px solid var(--line); }
.demo-strip p { margin: 0; text-align: center; color: var(--text); font-weight: 800; }
.section { padding: 104px 0; }
.section.alt { background: #091425; }
.section-head { max-width: 760px; margin-bottom: 46px; }
.section-head p:not(.eyebrow) { color: var(--muted); font-size: 18px; line-height: 1.75; }
.cards { display: grid; gap: 22px; }
.cards.three { grid-template-columns: repeat(3, 1fr); }
.card, .panel, details {
  border: 1px solid var(--line); border-radius: 24px; background: var(--card); box-shadow: 0 18px 48px rgba(0,0,0,.17);
}
.card { padding: 32px 28px; }
.card p, .panel p, details p { color: var(--muted); line-height: 1.75; }
.icon { display: inline-grid; place-items: center; width: 50px; height: 50px; margin-bottom: 24px; border-radius: 18px; background: rgba(53,213,255,.14); color: var(--primary); font-weight: 900; }
.split { display: grid; grid-template-columns: 1fr 0.85fr; gap: 52px; align-items: center; }
.split.reverse { grid-template-columns: 0.85fr 1fr; }
.check-list { list-style: none; padding: 0; margin: 28px 0 0; display: grid; gap: 14px; }
.check-list li { position: relative; padding-left: 34px; color: #d8e7f8; font-weight: 700; }
.check-list li::before { content: "✓"; position: absolute; left: 0; top: -2px; color: var(--accent); font-weight: 900; }
.panel { padding: 34px; background: var(--card-strong); }
.panel.dark { background: linear-gradient(135deg, rgba(38,198,255,.12), rgba(78,111,255,.1)); }
.panel a { color: var(--primary); font-weight: 900; }
.cta-band { padding: 72px 0; background: linear-gradient(135deg, #14b8e7, #63f1b2); color: #03101a; }
.cta-band .eyebrow, .cta-band p { color: rgba(3,16,26,.76); }
.cta-content { display: flex; align-items: center; justify-content: space-between; gap: 28px; }
.cta-content h2 { margin-bottom: 8px; color: #03101a; }
.cta-content p { margin-bottom: 0; font-weight: 700; }
.faq details { padding: 0; margin-bottom: 16px; overflow: hidden; background: rgba(255,255,255,.055); }
.faq summary { cursor: pointer; padding: 26px 30px; font-weight: 900; font-size: 18px; }
.faq details p { padding: 0 30px 26px; margin: 0; }
.footer { padding: 34px 0; border-top: 1px solid var(--line); color: var(--muted); }
.footer-inner { display: flex; justify-content: space-between; gap: 20px; align-items: center; }
.footer a { color: var(--primary); font-weight: 800; }
.floating-contact {
  position: fixed; right: 22px; bottom: 22px; z-index: 60; display: grid; grid-template-columns: auto 1fr; column-gap: 10px;
  align-items: center; padding: 15px 18px; border-radius: 22px; background: linear-gradient(135deg, var(--primary), var(--accent)); color: #04111d;
  box-shadow: 0 18px 48px rgba(0,0,0,.34); font-weight: 900;
}
.floating-contact span { grid-row: span 2; font-size: 24px; }
.floating-contact small { font-weight: 800; opacity: .78; }

@media (max-width: 900px) {
  .nav-links { display: none; }
  .hero { padding: 72px 0 58px; min-height: auto; }
  .hero-grid, .split, .split.reverse { grid-template-columns: 1fr; gap: 32px; }
  .cards.three { grid-template-columns: 1fr; }
  .cta-content, .footer-inner { align-items: flex-start; flex-direction: column; }
  .floating-contact { left: 18px; right: 18px; bottom: 16px; }
}

@media (max-width: 520px) {
  .container { width: min(100% - 28px, 1120px); }
  .nav-cta { display: none; }
  h1 { font-size: 42px; }
  .hero-card, .card, .panel { border-radius: 24px; padding: 24px; }
  .contact-box strong { font-size: 28px; }
  .section { padding: 72px 0; }
}