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

:root {
  --bg: #070b16;
  --panel: rgba(17, 24, 42, 0.72);
  --text: #f5f7ff;
  --muted: #aab3c8;
  --line: rgba(255,255,255,.1);
  --accent: #7c5cff;
  --accent2: #20d9ff;
}

html {
  scroll-behavior: smooth;
}

body {
  min-height: 100vh;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans JP", sans-serif;
  overflow-x: hidden;
}

.bg {
  position: fixed;
  inset: 0;
  z-index: -2;
  background:
    radial-gradient(circle at 15% 15%, rgba(124,92,255,.22), transparent 30%),
    radial-gradient(circle at 85% 25%, rgba(32,217,255,.14), transparent 28%),
    radial-gradient(circle at 50% 85%, rgba(124,92,255,.12), transparent 32%);
}

.bg::after {
  content: "";
  position: absolute;
  inset: 0;
  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: 42px 42px;
  mask-image: linear-gradient(to bottom, black, transparent);
}

.header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px 5%;
  background: rgba(7,11,22,.7);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(18px);
}

.logo, .footer-logo {
  color: var(--text);
  text-decoration: none;
  font-weight: 900;
  letter-spacing: 2px;
  font-size: 1.25rem;
}

.logo span, .footer-logo span {
  color: var(--accent2);
}

.nav {
  display: flex;
  gap: 6px;
}

.nav a {
  color: var(--muted);
  text-decoration: none;
  padding: 9px 12px;
  border-radius: 10px;
  font-size: .88rem;
  transition: .25s;
}

.nav a:hover {
  color: white;
  background: rgba(255,255,255,.08);
}

.menu-btn {
  display: none;
  border: 0;
  background: rgba(255,255,255,.08);
  color: white;
  border-radius: 10px;
  padding: 9px 12px;
  font-size: 1.2rem;
}

.section {
  width: min(1100px, 90%);
  margin: 0 auto;
  padding: 110px 0 50px;
  scroll-margin-top: 70px;
}

.hero {
  min-height: 100vh;
  display: grid;
  grid-template-columns: 1.2fr .8fr;
  align-items: center;
  gap: 50px;
  padding-top: 140px;
}

.eyebrow {
  color: var(--accent2);
  font-weight: 800;
  font-size: .75rem;
  letter-spacing: 3px;
  margin-bottom: 12px;
}

h1 {
  font-size: clamp(2.5rem, 8vw, 5.8rem);
  line-height: 1.02;
  margin-bottom: 24px;
}

h1 span {
  display: block;
  background: linear-gradient(90deg, #fff, var(--accent2), #a88cff);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.lead {
  color: var(--muted);
  font-size: 1.05rem;
  line-height: 1.9;
  max-width: 650px;
}

.hero-buttons {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 30px;
}

.btn {
  text-decoration: none;
  color: white;
  padding: 13px 19px;
  border-radius: 13px;
  font-weight: 700;
  transition: transform .2s, box-shadow .2s;
}

.btn:hover {
  transform: translateY(-3px);
}

.primary {
  background: linear-gradient(135deg, var(--accent), #4d8cff);
  box-shadow: 0 10px 30px rgba(124,92,255,.25);
}

.secondary {
  border: 1px solid var(--line);
  background: rgba(255,255,255,.05);
}

.hero-card {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  min-height: 350px;
  padding: 30px;
  border: 1px solid var(--line);
  border-radius: 30px;
  background: var(--panel);
  box-shadow: 0 30px 80px rgba(0,0,0,.3);
  backdrop-filter: blur(20px);
  animation: float 5s ease-in-out infinite;
}

.orb {
  width: 220px;
  height: 220px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  font-size: 1.4rem;
  font-weight: 900;
  letter-spacing: 4px;
  background: radial-gradient(circle at 35% 30%, #fff, #9d8cff 12%, #4b37a6 40%, #10152b 70%);
  box-shadow: 0 0 80px rgba(124,92,255,.35);
}

.hero-card p {
  margin-top: 24px;
  color: var(--muted);
  font-size: .75rem;
  letter-spacing: 2px;
}

.section-title {
  margin-bottom: 30px;
}

.section-title h2 {
  font-size: clamp(2rem, 5vw, 3.2rem);
}

.cards {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
}

.card, .single-card, .profile-card {
  border: 1px solid var(--line);
  background: var(--panel);
  border-radius: 22px;
  backdrop-filter: blur(18px);
  box-shadow: 0 20px 60px rgba(0,0,0,.18);
}

.card {
  padding: 28px;
  transition: transform .25s, border-color .25s;
}

.card:hover, .single-card:hover, .profile-card:hover {
  transform: translateY(-5px);
  border-color: rgba(124,92,255,.5);
}

.icon, .big-icon, .avatar {
  display: grid;
  place-items: center;
  width: 58px;
  height: 58px;
  border-radius: 16px;
  margin-bottom: 18px;
  font-size: 1.5rem;
  background: rgba(255,255,255,.07);
}

.card h3, .single-card h3, .profile-card h3 {
  font-size: 1.3rem;
  margin-bottom: 8px;
}

.card p, .single-card p, .profile-card p {
  color: var(--muted);
  line-height: 1.8;
}

.card-link {
  display: inline-block;
  margin-top: 18px;
  color: var(--accent2);
  font-weight: 800;
  text-decoration: none;
}

.single-card, .profile-card {
  padding: 30px;
  display: flex;
  align-items: center;
  gap: 25px;
}

.big-icon {
  flex: 0 0 72px;
  width: 72px;
  height: 72px;
  margin: 0;
  font-size: 2rem;
}

.avatar {
  flex: 0 0 90px;
  width: 90px;
  height: 90px;
  margin: 0;
  border-radius: 50%;
  font-size: 2.2rem;
  font-weight: 900;
  background: linear-gradient(135deg, var(--accent), var(--accent2));
}

.muted {
  margin-top: 5px;
  font-size: .9rem;
}

footer {
  text-align: center;
  padding: 70px 20px 35px;
  color: var(--muted);
  border-top: 1px solid var(--line);
}

footer p {
  margin-top: 10px;
  font-size: .8rem;
}

.reveal {
  opacity: 0;
  transform: translateY(25px);
  transition: opacity .8s ease, transform .8s ease;
}

.reveal.show {
  opacity: 1;
  transform: translateY(0);
}

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-12px); }
}

@media (max-width: 800px) {
  .header {
    padding: 14px 5%;
  }

  .menu-btn {
    display: block;
  }

  .nav {
    position: absolute;
    top: 67px;
    left: 5%;
    right: 5%;
    display: none;
    flex-direction: column;
    padding: 10px;
    border: 1px solid var(--line);
    border-radius: 16px;
    background: rgba(7,11,22,.96);
    backdrop-filter: blur(20px);
  }

  .nav.open {
    display: flex;
  }

  .nav a {
    padding: 13px;
  }

  .hero {
    grid-template-columns: 1fr;
    gap: 35px;
  }

  .hero-card {
    min-height: 260px;
  }

  .orb {
    width: 160px;
    height: 160px;
    font-size: 1rem;
  }

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

  .single-card, .profile-card {
    align-items: flex-start;
  }
}

@media (max-width: 480px) {
  .section {
    width: 92%;
    padding-top: 90px;
  }

  h1 {
    font-size: 2.7rem;
  }

  .lead {
    font-size: .95rem;
  }

  .single-card, .profile-card {
    flex-direction: column;
  }

  .big-icon, .avatar {
    flex-basis: auto;
  }
}