:root {
  --bg: #0a0f1e;
  --bg-soft: #121a31;
  --surface: rgba(20, 30, 54, 0.72);
  --surface-strong: #182544;
  --text: #ecf1ff;
  --text-soft: #b7c3e8;
  --primary: #00d48a;
  --primary-strong: #0acbff;
  --line: rgba(255, 255, 255, 0.12);
  --radius: 18px;
  --container: min(1140px, 92vw);
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
}

body {
  font-family: "Outfit", "Noto Sans SC", "Noto Sans JP", sans-serif;
  background: radial-gradient(1200px 600px at 15% -10%, #22356a 0%, transparent 55%),
    radial-gradient(900px 600px at 90% 10%, #12465d 0%, transparent 52%),
    linear-gradient(180deg, #090d1a 0%, #0e1427 40%, #0c1325 100%);
  color: var(--text);
  line-height: 1.6;
}

.ambient {
  position: fixed;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.03) 1px, transparent 1px);
  background-size: 28px 28px;
  mask-image: radial-gradient(circle at center, black 35%, transparent 100%);
  z-index: -1;
}

.container {
  width: var(--container);
  margin: 0 auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 30;
  backdrop-filter: blur(12px);
  background: rgba(8, 12, 24, 0.72);
  border-bottom: 1px solid var(--line);
}

.nav-wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 72px;
  gap: 12px;
}

.brand {
  color: var(--text);
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  letter-spacing: 0.2px;
}

.brand-mark {
  width: 32px;
  height: 32px;
  border-radius: 10px;
  display: grid;
  place-items: center;
  color: #001c13;
  background: linear-gradient(135deg, var(--primary), var(--primary-strong));
  box-shadow: 0 6px 20px rgba(0, 212, 138, 0.35);
}

.lang-switch {
  display: inline-flex;
  gap: 6px;
  flex-wrap: wrap;
}

.lang-btn {
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.06);
  color: var(--text-soft);
  padding: 8px 10px;
  border-radius: 999px;
  cursor: pointer;
  font: inherit;
  font-size: 13px;
  transition: all 0.2s ease;
}

.lang-btn:hover,
.lang-btn.active {
  color: #012217;
  background: linear-gradient(135deg, #00d48a, #58e2ff);
  border-color: transparent;
}

main {
  padding-bottom: 70px;
}

.hero {
  min-height: calc(100vh - 72px);
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 26px;
  align-items: center;
  padding-top: 42px;
  padding-bottom: 24px;
}

.tag {
  display: inline-block;
  color: #8fd8ff;
  border: 1px solid rgba(143, 216, 255, 0.35);
  background: rgba(100, 177, 231, 0.12);
  padding: 6px 12px;
  border-radius: 999px;
  font-size: 13px;
  letter-spacing: 0.4px;
  text-transform: uppercase;
}

h1 {
  margin: 14px 0 10px;
  font-size: clamp(2rem, 4.8vw, 3.7rem);
  line-height: 1.15;
  letter-spacing: 0.2px;
}

.hero-text {
  max-width: 62ch;
  color: var(--text-soft);
  margin: 0;
}

.hero-actions {
  margin-top: 22px;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.btn {
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 10px 16px;
  border-radius: 12px;
  border: 1px solid transparent;
  font-weight: 600;
  transition: transform 0.2s ease, filter 0.2s ease;
}

.btn:hover {
  transform: translateY(-1px);
  filter: brightness(1.06);
}

.btn-primary {
  color: #021d14;
  background: linear-gradient(135deg, var(--primary), #5ce7ff);
}

.btn-ghost {
  color: var(--text);
  border-color: var(--line);
  background: rgba(255, 255, 255, 0.06);
}

.stats {
  margin-top: 24px;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 10px;
}

.stat {
  border: 1px solid var(--line);
  background: var(--surface);
  border-radius: 14px;
  padding: 12px;
}

.stat strong {
  display: block;
  font-size: 1.25rem;
}

.stat span {
  color: var(--text-soft);
  font-size: 0.92rem;
}

.hero-panel {
  display: flex;
}

.panel-card {
  width: 100%;
  border: 1px solid var(--line);
  background: linear-gradient(180deg, rgba(31, 46, 80, 0.9), rgba(19, 32, 61, 0.75));
  border-radius: var(--radius);
  padding: 22px;
  box-shadow: 0 18px 46px rgba(6, 12, 28, 0.45);
}

.panel-card h3 {
  margin: 0 0 12px;
  font-size: 1.2rem;
}

.panel-card ul {
  margin: 0;
  padding-left: 20px;
  color: var(--text-soft);
}

.panel-card li + li {
  margin-top: 8px;
}

section {
  margin-top: 42px;
}

.section-head h2 {
  margin: 10px 0 0;
  font-size: clamp(1.4rem, 3.1vw, 2.2rem);
}

.feature-grid {
  margin-top: 16px;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
}

.feature-card,
.step,
.premium,
.faq-list article {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
}

.feature-card {
  padding: 16px;
}

.feature-card h3 {
  margin: 0 0 8px;
  font-size: 1.04rem;
}

.feature-card p {
  margin: 0;
  color: var(--text-soft);
  font-size: 0.96rem;
}

.steps {
  margin-top: 16px;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
}

.step {
  padding: 16px;
}

.step span {
  display: inline-block;
  color: #8ff4d1;
  font-weight: 700;
  letter-spacing: 0.6px;
}

.step h3 {
  margin: 7px 0 6px;
}

.step p {
  margin: 0;
  color: var(--text-soft);
}

.premium {
  margin-top: 46px;
  padding: 20px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 18px;
  background:
    linear-gradient(140deg, rgba(0, 212, 138, 0.12), transparent 45%),
    linear-gradient(180deg, rgba(22, 35, 65, 0.86), rgba(20, 33, 60, 0.74));
}

.premium-copy h2 {
  margin: 10px 0 10px;
}

.premium-copy p {
  margin: 0;
  color: var(--text-soft);
}

.premium-list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 10px;
}

.premium-list li {
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 12px 14px;
  background: rgba(255, 255, 255, 0.05);
}

.faq .faq-list {
  margin-top: 16px;
  display: grid;
  gap: 10px;
}

.faq-list article {
  padding: 14px 16px;
}

.faq-list h3 {
  margin: 0 0 8px;
  font-size: 1rem;
}

.faq-list p {
  margin: 0;
  color: var(--text-soft);
}

.site-footer {
  border-top: 1px solid var(--line);
  background: rgba(10, 15, 30, 0.9);
}

.footer-wrap {
  min-height: 100px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  padding-top: 18px;
  padding-bottom: 18px;
}

.footer-wrap p {
  margin: 4px 0 0;
  color: var(--text-soft);
  font-size: 0.92rem;
}

.footer-meta {
  text-align: right;
}

.reveal {
  animation: fade-up 0.7s ease both;
}

@keyframes fade-up {
  from {
    opacity: 0;
    transform: translateY(14px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@media (max-width: 980px) {
  .hero {
    grid-template-columns: 1fr;
    min-height: auto;
    padding-top: 28px;
  }

  .feature-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

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

@media (max-width: 640px) {
  .nav-wrap {
    min-height: 64px;
    flex-direction: column;
    justify-content: center;
    padding: 8px 0 10px;
  }

  .hero-actions .btn {
    width: 100%;
  }

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

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

  .footer-wrap {
    flex-direction: column;
    align-items: flex-start;
  }

  .footer-meta {
    text-align: left;
  }
}

@media (prefers-reduced-motion: reduce) {
  .reveal {
    animation: none;
  }

  .btn {
    transition: none;
  }
}