@font-face {
  font-family: Geist;
  src: url("/Geist-VariableFont_wght.ttf") format("truetype");
  font-style: normal;
  font-weight: 100 900;
  font-display: swap;
}

:root {
  --ink: #10172f;
  --muted: #566078;
  --purple: #5b3fd6;
  --purple-dark: #39209b;
  --lavender: #f5f2ff;
  --green: #218a55;
  --green-surface: #edf9f1;
  --border: #ddd9e8;
  --paper: #ffffff;
  --background: #faf9fd;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--background);
  color: var(--ink);
  font-family: Geist, Arial, sans-serif;
  font-size: 18px;
  line-height: 1.7;
}

a {
  color: var(--purple-dark);
}

.hero {
  position: relative;
  overflow: hidden;
  border-bottom: 1px solid var(--border);
  background:
    radial-gradient(circle at 82% 20%, #7455ec2e, transparent 28%),
    linear-gradient(135deg, #ffffff 0%, #f4f0ff 58%, #eef9ff 100%);
}

.hero::after {
  content: "";
  position: absolute;
  right: -140px;
  bottom: -190px;
  width: 420px;
  height: 420px;
  border: 80px solid #5b3fd60d;
  border-radius: 50%;
}

.hero-inner {
  position: relative;
  z-index: 1;
  width: min(1120px, calc(100% - 40px));
  margin: 0 auto;
  padding: 32px 0 72px;
}

.status {
  display: inline-block;
  margin: 0 0 16px;
  padding: 6px 14px;
  border: 1px solid #cfc2ff;
  border-radius: 999px;
  background: #ffffffbf;
  color: var(--purple-dark);
  font-size: 15px;
  font-weight: 720;
  letter-spacing: 0.02em;
  text-transform: uppercase;
}

h1 {
  max-width: 740px;
  margin: 0;
  font-size: clamp(44px, 7vw, 72px);
  font-weight: 760;
  letter-spacing: -0.045em;
  line-height: 1.03;
}

.intro {
  max-width: 700px;
  margin: 24px 0 0;
  color: #39425a;
  font-size: clamp(20px, 2.5vw, 25px);
  line-height: 1.5;
}

.updated {
  margin: 24px 0 0;
  color: var(--muted);
  font-size: 15px;
}

.page-grid {
  display: grid;
  grid-template-columns: 220px minmax(0, 760px);
  gap: 64px;
  width: min(1080px, calc(100% - 40px));
  margin: 0 auto;
  padding: 72px 0 96px;
}

aside {
  position: sticky;
  top: 24px;
  align-self: start;
}

.contents-title {
  margin: 0 0 12px;
  color: var(--ink);
  font-size: 15px;
  font-weight: 760;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

nav {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

nav a {
  padding: 8px 12px;
  border-left: 2px solid transparent;
  border-radius: 0 8px 8px 0;
  color: var(--muted);
  font-size: 15px;
  line-height: 1.35;
  text-decoration: none;
}

nav a:hover,
nav a:focus-visible {
  border-left-color: var(--purple);
  background: var(--lavender);
  color: var(--purple-dark);
}

article {
  min-width: 0;
}

section {
  margin-top: 64px;
  scroll-margin-top: 24px;
}

section:first-child {
  margin-top: 0;
}

h2 {
  margin: 0 0 20px;
  font-size: clamp(30px, 4vw, 38px);
  font-weight: 740;
  letter-spacing: -0.025em;
  line-height: 1.2;
}

h3 {
  margin: 32px 0 10px;
  font-size: 22px;
  font-weight: 700;
  line-height: 1.35;
}

p,
ul {
  margin: 0 0 18px;
}

ul {
  padding-left: 24px;
}

li {
  margin: 8px 0;
  padding-left: 4px;
}

strong {
  font-weight: 720;
}

.summary {
  padding: 32px;
  border: 1px solid #d8cff9;
  border-radius: 24px;
  background: linear-gradient(145deg, #ffffff 0%, var(--lavender) 100%);
  box-shadow: 0 18px 50px #1f174614;
}

.promise-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  margin: 4px 0 24px;
}

.promise-grid div {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  padding: 14px;
  border-radius: 14px;
  background: #ffffffc7;
}

.promise-grid span {
  display: grid;
  flex: 0 0 25px;
  width: 25px;
  height: 25px;
  place-items: center;
  border-radius: 50%;
  background: var(--green-surface);
  color: var(--green);
  font-size: 15px;
  font-weight: 800;
}

.promise-grid p {
  margin: 0;
  font-size: 16px;
  font-weight: 620;
  line-height: 1.4;
}

.notice {
  margin: 24px 0;
  padding: 20px 22px;
  border-left: 4px solid var(--purple);
  border-radius: 0 14px 14px 0;
  background: var(--lavender);
  color: #2e2753;
}

.primary-link {
  display: inline-block;
  padding: 12px 18px;
  border-radius: 10px;
  background: var(--purple-dark);
  color: #ffffff;
  font-weight: 720;
  text-decoration: none;
}

.primary-link:hover,
.primary-link:focus-visible {
  background: var(--purple);
  outline: 3px solid #cfc2ff;
  outline-offset: 3px;
}

footer {
  padding: 32px max(20px, calc(50vw - 540px));
  border-top: 1px solid var(--border);
  background: var(--paper);
}

.brand-lockup {
  display: flex;
  align-items: center;
  gap: 12px;
}

.brand-logo {
  flex: 0 0 40px;
  width: 40px;
  height: 40px;
  object-fit: contain;
  mix-blend-mode: multiply;
}

.brand-lockup p {
  margin: 0;
}

.brand-name {
  color: var(--purple-dark);
  font-size: 20px;
  font-weight: 760;
  line-height: 1.3;
}

.brand-tagline {
  color: var(--muted);
  font-size: 16px;
  line-height: 1.4;
}

@media (max-width: 820px) {
  .hero-inner {
    padding-bottom: 56px;
  }

  .page-grid {
    display: block;
    padding-top: 48px;
  }

  aside {
    position: static;
    margin-bottom: 48px;
    padding: 20px;
    border: 1px solid var(--border);
    border-radius: 16px;
    background: var(--paper);
  }

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

@media (max-width: 560px) {
  body {
    font-size: 17px;
  }

  .hero-inner,
  .page-grid {
    width: min(calc(100% - 32px), 1080px);
  }

  .summary {
    padding: 24px 20px;
    border-radius: 20px;
  }

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

  section {
    margin-top: 52px;
  }
}

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