:root {
  color-scheme: dark;
  --bg: #050b16;
  --surface: #0b1628;
  --surface-2: #101f35;
  --line: rgba(154, 185, 232, 0.16);
  --text: #f6f9ff;
  --muted: #9cafc8;
  --blue: #35b9ff;
  --blue-2: #5865ff;
  --max: 1120px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  min-width: 320px;
  color: var(--text);
  background:
    radial-gradient(circle at 82% 6%, rgba(54, 116, 255, 0.18), transparent 28rem),
    radial-gradient(circle at 10% 30%, rgba(39, 192, 255, 0.08), transparent 24rem),
    var(--bg);
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Display", "Helvetica Neue", "Noto Sans JP", sans-serif;
  line-height: 1.7;
}

a { color: inherit; }
button, input, select, textarea { font: inherit; }
.site-header {
  position: sticky;
  z-index: 10;
  top: 0;
  display: flex;
  justify-content: space-between;
  align-items: center;
  width: 100%;
  padding: 15px max(24px, calc((100vw - var(--max)) / 2));
  border-bottom: 1px solid var(--line);
  background: rgba(5, 11, 22, 0.78);
  backdrop-filter: blur(20px);
}
.brand { display: inline-flex; align-items: center; gap: 11px; text-decoration: none; font-weight: 750; letter-spacing: -.02em; }
.brand img { width: 36px; height: 36px; border-radius: 9px; }
nav { display: flex; align-items: center; gap: 24px; }
nav a { color: var(--muted); font-size: .91rem; text-decoration: none; }
nav a:hover { color: var(--text); }
.language-button {
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 6px 12px;
  color: var(--text);
  background: var(--surface);
  cursor: pointer;
}

main { overflow: hidden; }
.hero {
  display: grid;
  grid-template-columns: 1.25fr .75fr;
  align-items: center;
  gap: 80px;
  width: min(var(--max), calc(100% - 48px));
  min-height: 680px;
  margin: 0 auto;
  padding: 90px 0 70px;
}
.eyebrow { margin: 0 0 14px; color: var(--blue); font-size: .82rem; font-weight: 760; letter-spacing: .14em; text-transform: uppercase; }
h1 { margin: 0; font-size: clamp(3rem, 6vw, 5.5rem); line-height: 1.03; letter-spacing: -.055em; }
.lead { max-width: 660px; margin: 28px 0 0; color: var(--muted); font-size: 1.12rem; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 34px; }
.button {
  display: inline-flex;
  justify-content: center;
  align-items: center;
  min-height: 48px;
  border: 0;
  border-radius: 13px;
  padding: 11px 20px;
  font-weight: 700;
  text-decoration: none;
  cursor: pointer;
}
.primary { color: #00101d; background: linear-gradient(135deg, #6ed6ff, #4d7bff); box-shadow: 0 10px 32px rgba(64, 137, 255, .25); }
.secondary { color: var(--text); border: 1px solid var(--line); background: rgba(16, 31, 53, .7); }
.hero-mark { display: grid; place-items: center; }
.chip {
  position: relative;
  display: grid;
  place-items: center;
  width: min(310px, 70vw);
  aspect-ratio: 1;
  border: 2px solid rgba(72, 188, 255, .65);
  border-radius: 31%;
  background: linear-gradient(145deg, rgba(35, 72, 137, .8), rgba(8, 19, 40, .95));
  box-shadow: inset 0 0 45px rgba(56, 128, 255, .16), 0 30px 100px rgba(15, 92, 255, .22);
  transform: rotate(8deg);
}
.chip::before, .chip::after { content: ""; position: absolute; inset: 16%; border: 3px solid rgba(92, 208, 255, .75); border-radius: 34%; }
.chip::after { inset: -8%; border: 0; background: repeating-linear-gradient(90deg, transparent 0 14%, rgba(73, 183, 255, .58) 14% 17%, transparent 17% 25%); clip-path: polygon(0 42%, 100% 42%, 100% 58%, 0 58%); }
.chip span { color: transparent; font-size: 8rem; font-weight: 800; -webkit-text-stroke: 5px #43beff; filter: drop-shadow(0 0 20px rgba(46, 172, 255, .5)); transform: rotate(-8deg); }

.feature-strip {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  width: min(var(--max), calc(100% - 48px));
  margin: 0 auto;
  border: 1px solid var(--line);
  border-radius: 22px;
  background: linear-gradient(135deg, rgba(17, 34, 59, .85), rgba(8, 17, 31, .9));
}
.feature-strip div { padding: 24px; }
.feature-strip div + div { border-left: 1px solid var(--line); }
.feature-strip strong, .feature-strip span { display: block; }
.feature-strip span { margin-top: 5px; color: var(--muted); font-size: .86rem; }

.section { width: min(var(--max), calc(100% - 48px)); margin: 0 auto; padding: 120px 0 20px; scroll-margin-top: 70px; }
.section-heading { max-width: 680px; margin-bottom: 40px; }
h2 { margin: 0; font-size: clamp(2rem, 4.2vw, 3.4rem); line-height: 1.12; letter-spacing: -.04em; }
.section-heading > p:last-child { color: var(--muted); }
.contact-grid { display: grid; grid-template-columns: 1.25fr .75fr; gap: 20px; }
.contact-form, .contact-card, .privacy-card { border: 1px solid var(--line); border-radius: 24px; background: rgba(11, 22, 40, .74); }
.contact-form { display: grid; gap: 20px; padding: 30px; }
label span { display: block; margin-bottom: 7px; color: #c9d6e7; font-size: .9rem; font-weight: 650; }
input, select, textarea { width: 100%; border: 1px solid var(--line); border-radius: 12px; padding: 12px 14px; color: var(--text); background: #07111f; outline: none; }
input:focus, select:focus, textarea:focus { border-color: var(--blue); box-shadow: 0 0 0 3px rgba(53, 185, 255, .12); }
textarea { resize: vertical; }
.form-note { margin: -8px 0 0; color: var(--muted); font-size: .82rem; }
.contact-card { padding: 32px; }
.mail-icon { display: grid; place-items: center; width: 50px; height: 50px; border-radius: 14px; color: #021320; background: var(--blue); font-size: 1.4rem; font-weight: 800; }
.contact-card h3 { margin: 24px 0 8px; font-size: 1.35rem; }
.contact-card p { color: var(--muted); }
.contact-card > a { color: #6ed6ff; overflow-wrap: anywhere; }
dl { margin-top: 32px; }
dl div { display: flex; justify-content: space-between; gap: 18px; padding: 13px 0; border-top: 1px solid var(--line); }
dt { color: var(--muted); }
dd { margin: 0; text-align: right; }

.faq-list { border-top: 1px solid var(--line); }
details { border-bottom: 1px solid var(--line); }
summary { position: relative; padding: 25px 52px 25px 0; font-size: 1.08rem; font-weight: 700; cursor: pointer; list-style: none; }
summary::-webkit-details-marker { display: none; }
summary::after { content: "+"; position: absolute; right: 12px; color: var(--blue); font-size: 1.5rem; font-weight: 400; }
details[open] summary::after { content: "−"; }
details p { max-width: 800px; margin: -4px 0 26px; color: var(--muted); }
.privacy { padding-bottom: 120px; }
.privacy-card { padding: 32px; }
.privacy-card p { max-width: 880px; color: #c5d2e3; }
.privacy-card .updated { margin-top: 28px; color: var(--muted); font-size: .85rem; }

footer { display: flex; align-items: center; gap: 28px; width: min(var(--max), calc(100% - 48px)); margin: 0 auto; padding: 28px 0 44px; border-top: 1px solid var(--line); color: var(--muted); font-size: .84rem; }
footer p { margin-right: auto; }
footer .brand img { width: 28px; height: 28px; }

@media (max-width: 820px) {
  nav a { display: none; }
  .hero { grid-template-columns: 1fr; gap: 56px; min-height: auto; padding-top: 72px; text-align: center; }
  .hero-copy { display: flex; flex-direction: column; align-items: center; }
  .hero-mark { order: -1; }
  .chip { width: 190px; }
  .chip span { font-size: 5rem; }
  .feature-strip { grid-template-columns: repeat(2, 1fr); }
  .feature-strip div + div { border-left: 0; }
  .feature-strip div:nth-child(even) { border-left: 1px solid var(--line); }
  .feature-strip div:nth-child(n+3) { border-top: 1px solid var(--line); }
  .contact-grid { grid-template-columns: 1fr; }
  footer { flex-wrap: wrap; }
  footer p { width: 100%; margin: 0; order: 3; }
}

@media (max-width: 520px) {
  .site-header, .hero, .feature-strip, .section, footer { width: calc(100% - 32px); }
  .site-header { width: 100%; padding-inline: 16px; }
  h1 { font-size: 2.75rem; }
  .lead { font-size: 1rem; }
  .hero { padding-top: 48px; }
  .feature-strip { grid-template-columns: 1fr; }
  .feature-strip div:nth-child(even) { border-left: 0; }
  .feature-strip div:nth-child(n+2) { border-top: 1px solid var(--line); }
  .section { padding-top: 88px; }
  .contact-form, .contact-card, .privacy-card { padding: 22px; border-radius: 19px; }
  footer > a { overflow-wrap: anywhere; }
}

@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }