:root {
  --c-primary: #38bdf8;
  --c-primary-hover: #7dd3fc;
  --c-primary-soft: rgba(56, 189, 248, 0.14);
  --c-accent-glow: radial-gradient(circle, rgba(56, 189, 248, 0.35) 0%, transparent 60%);
  --c-bg: #0a0f1c;
  --c-bg-alt: #0f1626;
  --c-bg-card: #131b2c;
  --c-bg-card-hi: #182238;
  --c-text: #f1f5f9;
  --c-text-secondary: #cbd5e1;
  --c-text-muted: #94a3b8;
  --c-border: rgba(255, 255, 255, 0.08);
  --c-border-hi: rgba(255, 255, 255, 0.16);
  --c-success: #34d399;
  --c-danger: #f87171;
  --c-warning: #fbbf24;
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.35);
  --shadow-lg: 0 20px 60px rgba(56, 189, 248, 0.12), 0 8px 24px rgba(0, 0, 0, 0.4);
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-pill: 9999px;
  --max-w: 1180px;
  --gap-section: 96px;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html {
  font-family: "Pretendard Variable", Pretendard, -apple-system, BlinkMacSystemFont, system-ui, "Segoe UI", Roboto, sans-serif;
  font-size: 16px;
  line-height: 1.5;
  color: var(--c-text);
  background: var(--c-bg);
  -webkit-font-smoothing: antialiased;
  word-break: keep-all;
}
body { min-height: 100vh; background: var(--c-bg); }
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
button { font-family: inherit; }

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

/* ============== NAV ============== */
.nav {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(10, 15, 28, 0.78);
  backdrop-filter: saturate(150%) blur(14px);
  border-bottom: 1px solid var(--c-border);
}
.nav__inner {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 14px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}
.nav__logo {
  font-size: 22px;
  font-weight: 800;
  color: var(--c-text);
  letter-spacing: -0.02em;
}
.nav__logo span { color: var(--c-primary); }
.nav__links {
  display: flex;
  gap: 28px;
  font-size: 15px;
  font-weight: 500;
  color: var(--c-text-secondary);
}
.nav__links a:hover { color: var(--c-primary); }
.nav__right { display: flex; align-items: center; gap: 12px; }

.lang-toggle {
  display: flex;
  align-items: center;
  gap: 2px;
  padding: 4px;
  border-radius: var(--radius-pill);
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--c-border);
}
.lang-btn {
  padding: 5px 11px;
  border: 0;
  background: transparent;
  color: var(--c-text-secondary);
  font-size: 12px;
  font-weight: 700;
  border-radius: var(--radius-pill);
  cursor: pointer;
  transition: all 0.15s ease;
  letter-spacing: 0.02em;
}
.lang-btn:disabled {
  color: var(--c-text-muted);
  opacity: 0.45;
  cursor: not-allowed;
}
.lang-btn--active {
  background: var(--c-text);
  color: var(--c-bg);
}

.nav__cta {
  padding: 10px 18px;
  background: var(--c-primary);
  color: #0a0f1c;
  font-size: 14px;
  font-weight: 700;
  border-radius: var(--radius-pill);
  transition: all 0.15s ease;
}
.nav__cta:hover {
  background: var(--c-primary-hover);
  box-shadow: 0 0 24px rgba(56, 189, 248, 0.4);
}

/* ============== BUTTONS ============== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 13px 24px;
  font-size: 15px;
  font-weight: 600;
  border-radius: var(--radius-pill);
  cursor: pointer;
  transition: all 0.15s ease;
  border: 1px solid transparent;
  text-decoration: none;
}
.btn--primary {
  background: var(--c-primary);
  color: #0a0f1c;
  font-weight: 700;
}
.btn--primary:hover {
  background: var(--c-primary-hover);
  transform: translateY(-1px);
  box-shadow: 0 8px 32px rgba(56, 189, 248, 0.35);
}
.btn--secondary {
  background: rgba(255, 255, 255, 0.04);
  color: var(--c-text);
  border-color: var(--c-border-hi);
}
.btn--secondary:hover {
  background: rgba(255, 255, 255, 0.08);
  border-color: var(--c-primary);
  color: var(--c-primary);
}
.btn--lg { padding: 16px 32px; font-size: 16px; }
.btn--full { width: 100%; }
.btn-arrow { display: inline-block; transition: transform 0.15s ease; }
.btn:hover .btn-arrow { transform: translateX(3px); }

/* ============== HERO ============== */
.hero {
  position: relative;
  padding: 88px 0 112px;
  background:
    radial-gradient(ellipse 80% 60% at 70% 20%, rgba(56, 189, 248, 0.15) 0%, transparent 60%),
    radial-gradient(ellipse 60% 50% at 20% 80%, rgba(167, 139, 250, 0.10) 0%, transparent 60%),
    var(--c-bg);
  overflow: hidden;
}
.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255,255,255,0.025) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.025) 1px, transparent 1px);
  background-size: 48px 48px;
  mask-image: radial-gradient(ellipse 60% 80% at 50% 50%, #000 30%, transparent 80%);
  pointer-events: none;
}
.hero__container {
  position: relative;
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 24px;
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  align-items: center;
  gap: 56px;
  z-index: 1;
}
.hero__badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 14px;
  background: var(--c-primary-soft);
  color: var(--c-primary);
  border: 1px solid rgba(56, 189, 248, 0.3);
  font-size: 13px;
  font-weight: 600;
  border-radius: var(--radius-pill);
  margin-bottom: 24px;
  backdrop-filter: blur(8px);
}
.hero__badge-dot {
  width: 6px;
  height: 6px;
  background: var(--c-primary);
  border-radius: 50%;
  box-shadow: 0 0 12px var(--c-primary);
  animation: pulse 2s ease-in-out infinite;
}
@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.5; }
}
.hero h1 {
  font-size: clamp(40px, 5.6vw, 64px);
  line-height: 1.05;
  letter-spacing: -0.035em;
  font-weight: 800;
  color: var(--c-text);
  margin-bottom: 18px;
}
.hero h1 .accent {
  background: linear-gradient(135deg, #38bdf8 0%, #818cf8 50%, #c084fc 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}
.hero__sub {
  font-size: 18px;
  line-height: 1.65;
  color: var(--c-text-secondary);
  margin-bottom: 28px;
  max-width: 540px;
}
.hero__bullets {
  list-style: none;
  margin-bottom: 32px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.hero__bullets li {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-size: 15px;
  color: var(--c-text);
  font-weight: 500;
}
.hero__check {
  flex-shrink: 0;
  width: 22px;
  height: 22px;
  background: rgba(52, 211, 153, 0.18);
  color: var(--c-success);
  border-radius: 50%;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 12px;
  font-weight: 800;
  margin-top: 1px;
}
.hero__actions { display: flex; gap: 12px; flex-wrap: wrap; }

.hero__visual {
  position: relative;
  border-radius: var(--radius-lg);
  aspect-ratio: 4 / 3.2;
  overflow: hidden;
  background:
    radial-gradient(circle at 30% 20%, rgba(56, 189, 248, 0.4) 0%, transparent 50%),
    radial-gradient(circle at 70% 80%, rgba(167, 139, 250, 0.35) 0%, transparent 55%),
    linear-gradient(135deg, #0f172a 0%, #1e293b 100%);
  border: 1px solid var(--c-border-hi);
  box-shadow: 0 24px 60px rgba(0, 0, 0, 0.5);
}
.hero__visual::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255,255,255,0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.04) 1px, transparent 1px);
  background-size: 32px 32px;
}
.hero__stats {
  position: absolute;
  bottom: 20px;
  left: 20px;
  right: 20px;
  background: rgba(15, 23, 42, 0.72);
  border: 1px solid var(--c-border-hi);
  backdrop-filter: blur(16px);
  border-radius: var(--radius-md);
  padding: 16px 18px;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
}
.hero__stat strong {
  display: block;
  font-size: 22px;
  color: var(--c-text);
  font-weight: 800;
  letter-spacing: -0.02em;
  margin-bottom: 2px;
}
.hero__stat span {
  font-size: 12px;
  color: var(--c-text-muted);
  font-weight: 500;
}

/* ============== SECTION HEADERS ============== */
.sec-head {
  text-align: center;
  max-width: 720px;
  margin: 0 auto 56px;
}
.sec-tag {
  display: inline-block;
  font-size: 12px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--c-primary);
  margin-bottom: 12px;
}
.sec-title {
  font-size: clamp(28px, 3.5vw, 42px);
  line-height: 1.2;
  letter-spacing: -0.025em;
  color: var(--c-text);
  font-weight: 800;
  margin-bottom: 14px;
}
.sec-sub {
  font-size: 17px;
  color: var(--c-text-secondary);
  line-height: 1.6;
}

/* ============== TRUST ============== */
.trust { padding: var(--gap-section) 0; }
.trust__grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 14px;
}
.trust-card {
  background: var(--c-bg-card);
  border: 1px solid var(--c-border);
  border-radius: var(--radius-md);
  padding: 28px 18px;
  text-align: center;
  transition: all 0.18s ease;
}
.trust-card:hover {
  border-color: var(--c-primary);
  background: var(--c-bg-card-hi);
  transform: translateY(-2px);
  box-shadow: 0 12px 32px rgba(56, 189, 248, 0.12);
}
.trust-card__icon {
  width: 44px;
  height: 44px;
  margin: 0 auto 14px;
  background: var(--c-primary-soft);
  color: var(--c-primary);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 22px;
  font-weight: 800;
  border: 1px solid rgba(56, 189, 248, 0.25);
}
.trust-card h3 {
  font-size: 15px;
  font-weight: 700;
  color: var(--c-text);
  margin-bottom: 6px;
  letter-spacing: -0.01em;
  line-height: 1.3;
}
.trust-card p {
  font-size: 13px;
  color: var(--c-text-secondary);
  line-height: 1.5;
}

/* ============== PROCESS ============== */
.process { padding: var(--gap-section) 0; background: var(--c-bg-alt); }
.process__grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
}
.process-step {
  background: var(--c-bg-card);
  border: 1px solid var(--c-border);
  border-radius: var(--radius-md);
  padding: 28px 22px;
  position: relative;
  transition: border-color 0.18s ease;
}
.process-step:hover { border-color: var(--c-primary); }
.process-step__num {
  display: inline-block;
  font-size: 12px;
  font-weight: 800;
  color: var(--c-primary);
  letter-spacing: 0.05em;
  margin-bottom: 12px;
}
.process-step h3 {
  font-size: 17px;
  font-weight: 700;
  color: var(--c-text);
  margin-bottom: 8px;
  letter-spacing: -0.01em;
}
.process-step p {
  font-size: 14px;
  color: var(--c-text-secondary);
  line-height: 1.55;
}

/* ============== COMPARISON ============== */
.compare { padding: var(--gap-section) 0; }
.compare__wrap {
  overflow-x: auto;
  border: 1px solid var(--c-border);
  border-radius: var(--radius-md);
  background: var(--c-bg-card);
}
.compare table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
  min-width: 760px;
}
.compare th, .compare td {
  padding: 14px 16px;
  text-align: center;
  border-bottom: 1px solid var(--c-border);
}
.compare th {
  background: rgba(255, 255, 255, 0.03);
  font-weight: 700;
  color: var(--c-text);
  font-size: 13px;
  letter-spacing: 0.02em;
}
.compare th:first-child, .compare td:first-child {
  text-align: left;
  font-weight: 500;
  color: var(--c-text-secondary);
}
.compare .col-gc4s {
  background: var(--c-primary-soft);
  color: var(--c-primary);
  font-weight: 700;
}
.compare th.col-gc4s {
  background: var(--c-primary);
  color: #0a0f1c;
}
.compare tr:last-child td { border-bottom: 0; }
.check { color: var(--c-success); font-weight: 700; }
.cross { color: var(--c-danger); }
.partial { color: var(--c-warning); font-weight: 600; }
.compare__note {
  text-align: center;
  margin-top: 24px;
  font-size: 13px;
  color: var(--c-text-muted);
}

/* ============== PRICING ============== */
.pricing { padding: var(--gap-section) 0; background: var(--c-bg-alt); }
.pricing__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}
.price-card {
  background: var(--c-bg-card);
  border: 1px solid var(--c-border);
  border-radius: var(--radius-lg);
  padding: 36px 28px;
  display: flex;
  flex-direction: column;
  position: relative;
  transition: all 0.2s ease;
}
.price-card:hover {
  border-color: var(--c-border-hi);
  transform: translateY(-2px);
  background: var(--c-bg-card-hi);
}
.price-card--featured {
  border-color: var(--c-primary);
  border-width: 1px;
  box-shadow: 0 0 0 1px var(--c-primary), 0 20px 40px rgba(56, 189, 248, 0.18);
}
.price-card--featured:hover {
  border-color: var(--c-primary);
  box-shadow: 0 0 0 1px var(--c-primary), 0 28px 60px rgba(56, 189, 248, 0.28);
}
.price-card__badge {
  position: absolute;
  top: -12px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--c-primary);
  color: #0a0f1c;
  font-size: 12px;
  font-weight: 800;
  padding: 6px 14px;
  border-radius: var(--radius-pill);
  letter-spacing: 0.02em;
}
.price-card__name {
  font-size: 13px;
  font-weight: 700;
  color: var(--c-text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 12px;
}
.price-card__price {
  font-size: 42px;
  font-weight: 800;
  color: var(--c-text);
  letter-spacing: -0.025em;
  line-height: 1;
  margin-bottom: 6px;
}
.price-card__desc {
  font-size: 14px;
  color: var(--c-text-secondary);
  margin-bottom: 24px;
  min-height: 42px;
  line-height: 1.5;
}
.price-card__features {
  list-style: none;
  margin-bottom: 28px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.price-card__features li {
  font-size: 14px;
  color: var(--c-text);
  display: flex;
  gap: 10px;
  align-items: flex-start;
  line-height: 1.5;
}
.price-card__features li::before {
  content: "✓";
  color: var(--c-success);
  font-weight: 700;
  flex-shrink: 0;
}
.price-card__features li.excluded { color: var(--c-text-muted); }
.price-card__features li.excluded::before {
  content: "—";
  color: var(--c-text-muted);
}
.price-card__cta { margin-top: auto; }
.pricing__note {
  text-align: center;
  margin-top: 32px;
  font-size: 13px;
  color: var(--c-text-muted);
}

/* ============== FAQ ============== */
.faq { padding: var(--gap-section) 0; }
.faq__list { max-width: 800px; margin: 0 auto; }
.faq-item {
  border-bottom: 1px solid var(--c-border);
  padding: 24px 0;
}
.faq-item__q {
  font-size: 17px;
  font-weight: 700;
  color: var(--c-text);
  margin-bottom: 8px;
  letter-spacing: -0.01em;
}
.faq-item__a {
  font-size: 15px;
  color: var(--c-text-secondary);
  line-height: 1.65;
}

/* ============== FINAL CTA ============== */
.final-cta {
  position: relative;
  padding: var(--gap-section) 0;
  text-align: center;
  background:
    radial-gradient(ellipse 60% 60% at 50% 50%, rgba(56, 189, 248, 0.18) 0%, transparent 60%),
    var(--c-bg-alt);
  overflow: hidden;
}
.final-cta::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255,255,255,0.025) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.025) 1px, transparent 1px);
  background-size: 48px 48px;
  mask-image: radial-gradient(ellipse 60% 60% at 50% 50%, #000 30%, transparent 80%);
  pointer-events: none;
}
.final-cta__inner { position: relative; z-index: 1; }
.final-cta__title {
  font-size: clamp(28px, 4vw, 46px);
  font-weight: 800;
  color: var(--c-text);
  margin-bottom: 14px;
  letter-spacing: -0.025em;
}
.final-cta__sub {
  font-size: 17px;
  color: var(--c-text-secondary);
  margin-bottom: 32px;
}
.final-cta__actions {
  display: inline-flex;
  gap: 12px;
  flex-wrap: wrap;
  justify-content: center;
}

/* ============== FOOTER ============== */
.footer {
  background: #050811;
  color: rgba(255, 255, 255, 0.85);
  padding: 56px 0 28px;
  font-size: 14px;
  border-top: 1px solid var(--c-border);
}
.footer__inner { max-width: var(--max-w); margin: 0 auto; padding: 0 24px; }
.footer__grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 48px;
  margin-bottom: 40px;
}
.footer__brand {
  font-size: 22px;
  font-weight: 800;
  color: #fff;
  margin-bottom: 14px;
}
.footer__brand span { color: var(--c-primary); }
.footer__about {
  color: rgba(255, 255, 255, 0.55);
  line-height: 1.6;
  font-size: 14px;
  max-width: 420px;
}
.footer__col h4 {
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: #fff;
  margin-bottom: 16px;
  font-weight: 700;
}
.footer__col a {
  display: block;
  margin-bottom: 8px;
  color: rgba(255, 255, 255, 0.55);
  font-size: 14px;
}
.footer__col a:hover { color: var(--c-primary); }
.footer__bottom {
  padding-top: 24px;
  border-top: 1px solid var(--c-border);
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
  color: rgba(255, 255, 255, 0.4);
  font-size: 12px;
  line-height: 1.5;
}

/* ============== PROTOTYPE BANNER ============== */
.proto-banner {
  background: var(--c-primary);
  color: #0a0f1c;
  padding: 8px 16px;
  font-size: 12px;
  text-align: center;
  font-weight: 700;
  letter-spacing: 0.02em;
}
.proto-banner a {
  color: #0a0f1c;
  text-decoration: underline;
  margin-left: 4px;
  font-weight: 600;
}

/* ============== RESPONSIVE ============== */
@media (max-width: 1000px) {
  .hero__container { grid-template-columns: 1fr; gap: 32px; }
  .hero__visual { aspect-ratio: 16/10; }
  .trust__grid { grid-template-columns: repeat(2, 1fr); }
  .process__grid { grid-template-columns: repeat(2, 1fr); }
  .pricing__grid { grid-template-columns: 1fr; max-width: 480px; margin-left: auto; margin-right: auto; }
  .footer__grid { grid-template-columns: 1fr 1fr; gap: 32px; }
}
@media (max-width: 640px) {
  :root { --gap-section: 64px; }
  .nav__links { display: none; }
  .hero { padding: 64px 0 80px; }
  .hero__stats { grid-template-columns: 1fr 1fr; }
  .hero__stat:nth-child(3) { display: none; }
  .trust__grid { grid-template-columns: 1fr; }
  .process__grid { grid-template-columns: 1fr; }
  .footer__grid { grid-template-columns: 1fr; }
}