:root {
  color-scheme: light dark;
  --accent: #ff6b4a;
  --accent-strong: #c93d22;
  --ink: #1f2937;
  --muted: #667085;
  --mist: #f1f5f9;
  --paper: #ffffff;
  --line: #dfe5ec;
  --display: "Avenir Next", "Hiragino Sans", "Yu Gothic UI", sans-serif;
  --body: -apple-system, BlinkMacSystemFont, "Hiragino Sans", "Yu Gothic UI", sans-serif;
  font-family: var(--body);
  background: var(--mist);
  color: var(--ink);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-width: 320px;
  background: var(--mist);
  color: var(--ink);
  font-size: 16px;
  line-height: 1.75;
}

a {
  color: inherit;
  text-underline-offset: 0.2em;
}

a:hover {
  color: var(--accent-strong);
}

a:focus-visible,
button:focus-visible {
  outline: 3px solid var(--accent);
  outline-offset: 4px;
  border-radius: 4px;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  border-bottom: 1px solid color-mix(in srgb, var(--line) 80%, transparent);
  background: color-mix(in srgb, var(--mist) 92%, transparent);
  backdrop-filter: blur(14px);
}

.nav {
  width: min(1080px, calc(100% - 40px));
  min-height: 68px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--ink);
  font-family: var(--display);
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-decoration: none;
}

.brand img {
  width: 32px;
  height: 32px;
  border-radius: 9px;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 24px;
  margin: 0;
  padding: 0;
  list-style: none;
  font-size: 0.92rem;
  font-weight: 600;
}

.nav-links a {
  text-decoration: none;
}

.nav-links a[aria-current="page"] {
  color: var(--accent-strong);
}

main {
  width: min(1080px, calc(100% - 40px));
  margin: 0 auto;
}

.hero {
  min-height: 620px;
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(280px, 0.85fr);
  align-items: center;
  gap: clamp(48px, 9vw, 120px);
  padding: 96px 0 88px;
}

.eyebrow {
  margin: 0 0 12px;
  color: var(--accent-strong);
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

h1,
h2,
h3 {
  margin-top: 0;
  font-family: var(--display);
  line-height: 1.25;
  letter-spacing: 0.01em;
}

h1 {
  margin-bottom: 24px;
  font-size: clamp(2.5rem, 6vw, 5rem);
  font-weight: 700;
  letter-spacing: 0.08em;
}

h2 {
  margin-bottom: 20px;
  font-size: clamp(1.7rem, 3vw, 2.4rem);
}

h3 {
  margin-bottom: 8px;
  font-size: 1.08rem;
}

.lead {
  max-width: 34rem;
  margin: 0;
  color: var(--muted);
  font-size: clamp(1.05rem, 2vw, 1.25rem);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 32px;
}

.button {
  min-height: 48px;
  padding: 11px 22px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--ink);
  border-radius: 999px;
  font-weight: 700;
  text-decoration: none;
}

.button-primary {
  border-color: var(--accent);
  background: var(--accent);
  color: #111827;
}

.button-primary:hover {
  border-color: var(--accent-strong);
  background: var(--accent-strong);
  color: #111827;
}

.mark-stage {
  position: relative;
  display: grid;
  place-items: center;
}

.mark-stage::before {
  content: "";
  position: absolute;
  width: 76%;
  aspect-ratio: 1;
  border: 1px solid var(--line);
  border-radius: 50%;
}

.mark-stage img {
  position: relative;
  width: min(340px, 86%);
  filter: drop-shadow(0 24px 36px rgb(31 41 55 / 0.12));
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.feature {
  min-height: 240px;
  padding: 48px 34px;
}

.feature + .feature {
  border-left: 1px solid var(--line);
}

.feature p {
  margin: 0;
  color: var(--muted);
}

.feature-mark {
  width: 34px;
  height: 8px;
  margin-bottom: 28px;
  border-radius: 999px;
  background: var(--accent);
}

.plus-band {
  margin: 72px 0 0;
  padding: clamp(32px, 6vw, 60px);
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(260px, 0.9fr);
  align-items: center;
  gap: clamp(30px, 7vw, 90px);
  border: 1px solid color-mix(in srgb, var(--accent) 48%, var(--line));
  border-radius: 28px;
  background: color-mix(in srgb, var(--accent) 8%, var(--paper));
}

.plus-band h2 {
  margin-bottom: 14px;
}

.plus-band p:not(.eyebrow) {
  max-width: 34rem;
  margin: 0;
  color: var(--muted);
}

.plus-list {
  margin: 0 0 24px;
  padding: 0;
  list-style: none;
}

.plus-list li {
  position: relative;
  padding: 9px 0 9px 28px;
  border-bottom: 1px solid var(--line);
  font-weight: 600;
}

.plus-list li::before {
  content: "＋";
  position: absolute;
  left: 0;
  color: var(--accent-strong);
  font-weight: 800;
}

.contact-band {
  margin: 88px 0;
  padding: clamp(32px, 6vw, 64px);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 32px;
  border-radius: 28px;
  background: var(--ink);
  color: #ffffff;
}

.contact-band h2,
.contact-band p {
  margin-bottom: 0;
}

.contact-band p {
  color: #cbd5e1;
}

.document {
  width: min(760px, 100%);
  margin: 0 auto;
  padding: 80px 0 104px;
}

.document-header {
  padding-bottom: 36px;
  border-bottom: 1px solid var(--line);
}

.document-header h1 {
  margin-bottom: 12px;
  font-size: clamp(2.1rem, 5vw, 3.4rem);
  letter-spacing: 0;
}

.document-meta {
  margin: 0;
  color: var(--muted);
  font-size: 0.92rem;
}

.document section {
  padding-top: 44px;
}

.document p,
.document li {
  color: #475467;
}

.document ul {
  padding-left: 1.4em;
}

.notice {
  margin-top: 32px;
  padding: 20px 22px;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: var(--paper);
}

.faq-item {
  padding: 28px 0;
  border-top: 1px solid var(--line);
}

.faq-item:last-child {
  border-bottom: 1px solid var(--line);
}

.faq-item p {
  margin-bottom: 0;
}

.site-footer {
  border-top: 1px solid var(--line);
}

.footer-inner {
  width: min(1080px, calc(100% - 40px));
  margin: 0 auto;
  padding: 32px 0 44px;
  display: flex;
  justify-content: space-between;
  gap: 24px;
  color: var(--muted);
  font-size: 0.86rem;
}

.footer-inner p {
  margin: 0;
}

.footer-links {
  display: flex;
  gap: 18px;
}

@media (max-width: 760px) {
  .nav {
    min-height: 62px;
  }

  .nav-links {
    gap: 14px;
    font-size: 0.82rem;
  }

  .hero {
    min-height: auto;
    grid-template-columns: 1fr;
    padding: 72px 0 64px;
  }

  .mark-stage {
    grid-row: 1;
  }

  .mark-stage img {
    width: min(240px, 70%);
  }

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

  .feature {
    min-height: auto;
    padding: 34px 0;
  }

  .feature + .feature {
    border-top: 1px solid var(--line);
    border-left: 0;
  }

  .plus-band {
    margin-top: 48px;
  }

  .contact-band,
  .footer-inner {
    align-items: flex-start;
    flex-direction: column;
  }
}

@media (max-width: 480px) {
  main,
  .nav,
  .footer-inner {
    width: min(100% - 28px, 1080px);
  }

  .brand {
    letter-spacing: 0.06em;
  }

  .nav-links li:first-child {
    display: none;
  }

  .contact-band {
    border-radius: 20px;
  }
}

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

@media (prefers-color-scheme: dark) {
  :root {
    --accent-strong: #ff8a65;
    --ink: #f8fafc;
    --muted: #aab4c3;
    --mist: #111827;
    --paper: #1f2937;
    --line: #344054;
  }

  .brand img,
  .mark-stage img {
    filter: brightness(0.94) drop-shadow(0 24px 36px rgb(0 0 0 / 0.24));
  }

  .document p,
  .document li {
    color: #cbd5e1;
  }

  .contact-band {
    background: #020617;
  }
}