*, *::before, *::after {
  box-sizing: border-box;
}

:root {
  --ink: #172126;
  --muted: #5c6773;
  --line: #eadfd8;
  --paper: #fffaf6;
  --white: #ffffff;
  --rose: #f87171;
  --orange: #fb923c;
  --yellow: #fbbf24;
  --green: #34d399;
  --blue: #60a5fa;
  --purple: #a78bfa;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  font-family: "Noto Sans JP", "Hiragino Sans", "Yu Gothic", system-ui, -apple-system, sans-serif;
  line-height: 1.8;
  background:
    linear-gradient(90deg, rgba(248, 113, 113, 0.08), rgba(251, 191, 36, 0.07), rgba(52, 211, 153, 0.07), rgba(96, 165, 250, 0.08)),
    var(--paper);
}

a {
  color: inherit;
  text-decoration: none;
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 10;
  background: rgba(255, 250, 246, 0.88);
  border-bottom: 1px solid rgba(234, 223, 216, 0.78);
  backdrop-filter: blur(18px);
}

.topbar-inner {
  width: min(1120px, calc(100% - 32px));
  min-height: 64px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 900;
}

.brand img {
  width: 34px;
  height: 34px;
  border-radius: 11px;
}

.nav {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 14px;
  color: var(--muted);
  font-size: 13px;
  font-weight: 800;
}

.nav a:hover {
  color: var(--ink);
}

.hero {
  min-height: 82svh;
  display: grid;
  align-items: end;
  color: var(--white);
  background-image:
    linear-gradient(180deg, rgba(12, 18, 28, 0.4) 0%, rgba(12, 18, 28, 0.72) 52%, rgba(12, 18, 28, 0.92) 100%),
    url("./social-preview.png");
  background-size: cover;
  background-position: center;
}

.hero-inner {
  width: min(1120px, calc(100% - 32px));
  margin: 0 auto;
  padding: 120px 0 76px;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin: 0 0 18px;
  color: rgba(255, 255, 255, 0.78);
  font-size: 12px;
  font-weight: 900;
}

.eyebrow::before {
  content: "";
  width: 40px;
  height: 4px;
  border-radius: 999px;
  background: linear-gradient(90deg, var(--rose), var(--yellow), var(--green), var(--blue), var(--purple));
}

h1 {
  max-width: 780px;
  margin: 0;
  font-size: clamp(40px, 8vw, 82px);
  line-height: 1.04;
}

.hero-copy {
  max-width: 680px;
  margin: 22px 0 0;
  color: rgba(255, 255, 255, 0.84);
  font-size: clamp(15px, 2vw, 18px);
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

.button {
  display: inline-flex;
  min-height: 48px;
  align-items: center;
  justify-content: center;
  border-radius: 999px;
  padding: 0 20px;
  font-size: 14px;
  font-weight: 900;
}

.button.primary {
  color: #1f2937;
  background: #fde68a;
}

.button.secondary {
  color: var(--white);
  border: 1px solid rgba(255, 255, 255, 0.32);
  background: rgba(255, 255, 255, 0.08);
}

main {
  width: min(1120px, calc(100% - 32px));
  margin: 0 auto;
}

.section {
  padding: 72px 0;
}

.section.tight {
  padding-top: 42px;
}

.section-label {
  margin: 0 0 10px;
  color: #c0564d;
  font-size: 12px;
  font-weight: 900;
}

.section-title {
  margin: 0;
  font-size: clamp(28px, 4vw, 44px);
  line-height: 1.25;
}

.section-desc {
  max-width: 720px;
  margin: 14px 0 0;
  color: var(--muted);
}

.grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
  margin-top: 28px;
}

.card {
  min-height: 190px;
  padding: 22px;
  border: 1px solid rgba(234, 223, 216, 0.9);
  border-radius: 18px;
  background: rgba(255, 255, 255, 0.9);
  box-shadow: 0 16px 38px rgba(23, 33, 38, 0.06);
}

.card strong {
  display: block;
  margin-bottom: 10px;
  font-size: 17px;
}

.card p {
  margin: 0;
  color: var(--muted);
  font-size: 14px;
}

.split {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
  gap: 28px;
  align-items: start;
}

.legal-layout {
  padding: 56px 0 72px;
}

.doc {
  display: grid;
  gap: 18px;
}

.doc section {
  padding: 24px;
  border: 1px solid rgba(234, 223, 216, 0.9);
  border-radius: 18px;
  background: rgba(255, 255, 255, 0.92);
}

.doc h2 {
  margin: 0 0 12px;
  font-size: 20px;
}

.doc p,
.doc li {
  color: var(--muted);
  font-size: 14px;
}

.doc p {
  margin: 0;
}

.doc ul,
.doc ol {
  margin: 0;
  padding-left: 1.3em;
}

.doc a {
  color: #b44d43;
  font-weight: 900;
  text-decoration: underline;
}

.note {
  border-left: 5px solid var(--orange);
}

.footer {
  padding: 44px 16px;
  color: rgba(255, 255, 255, 0.72);
  text-align: center;
  background: #172126;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 16px;
  margin-bottom: 12px;
  font-size: 13px;
  font-weight: 800;
}

@media (max-width: 760px) {
  .topbar-inner {
    min-height: 74px;
    align-items: flex-start;
    flex-direction: column;
    justify-content: center;
    padding: 12px 0;
  }

  .nav {
    justify-content: flex-start;
  }

  .hero {
    min-height: 76svh;
  }

  .grid,
  .split {
    grid-template-columns: 1fr;
  }

  .section {
    padding: 52px 0;
  }
}