:root {
  --bg: #f5f5f7;
  --panel: rgba(255,255,255,0.72);
  --text: #111214;
  --muted: rgba(17,18,20,0.68);
  --line: rgba(17,18,20,0.08);
  --shadow: 0 30px 70px rgba(15, 23, 42, 0.08);
  --hero-a: #dfe7ff;
  --hero-b: #f9e6d8;
  --hero-c: #f2f7ff;
  --accent: #1f5eff;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
img { max-width: 100%; }
body {
  margin: 0;
  color: var(--text);
  background:
    radial-gradient(circle at 12% 10%, var(--hero-a), transparent 28%),
    radial-gradient(circle at 88% 18%, var(--hero-b), transparent 26%),
    linear-gradient(180deg, #fbfbfd 0%, var(--bg) 100%);
  font-family: "SF Pro Display", "SF Pro Text", -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
}
body.theme-kotoba {
  --hero-a: #dce7ff;
  --hero-b: #ffe9db;
  --hero-c: #eef5ff;
  --accent: #1668e3;
}
body.theme-ayame {
  --hero-a: #efe3ff;
  --hero-b: #ffe4f1;
  --hero-c: #faf5ff;
  --accent: #7c3aed;
}
body.theme-aimyon {
  --hero-a: #ffe6c8;
  --hero-b: #ffe7a6;
  --hero-c: #fff7ea;
  --accent: #d97706;
}
.site-nav {
  position: sticky;
  top: 0;
  z-index: 20;
  backdrop-filter: saturate(180%) blur(18px);
  background: rgba(250,250,252,0.74);
  border-bottom: 1px solid rgba(17,18,20,0.06);
}
.nav-inner {
  max-width: 1180px;
  margin: 0 auto;
  padding: 14px 22px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}
.brand {
  font-size: 13px;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--muted);
}
.nav-links {
  display: flex;
  gap: 18px;
  flex-wrap: wrap;
}
.nav-links a {
  color: var(--text);
  text-decoration: none;
  font-size: 14px;
  opacity: .76;
}
.nav-links a:hover { opacity: 1; }
.hero {
  max-width: 1180px;
  margin: 0 auto;
  padding: 72px 22px 54px;
}
.kicker {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 8px 14px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: rgba(255,255,255,.68);
  color: var(--muted);
  font-size: 12px;
  letter-spacing: .14em;
  text-transform: uppercase;
}
.hero h1 {
  margin: 22px 0 16px;
  font-size: clamp(54px, 11vw, 116px);
  line-height: .9;
  letter-spacing: -.05em;
  max-width: 980px;
}
.hero p {
  max-width: 760px;
  margin: 0;
  font-size: clamp(18px, 2.5vw, 25px);
  line-height: 1.62;
  color: var(--muted);
}
.hero-meta {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 14px;
  margin-top: 34px;
}
.hero-pill {
  padding: 16px 18px;
  border-radius: 22px;
  border: 1px solid var(--line);
  background: rgba(255,255,255,0.7);
  box-shadow: var(--shadow);
}
.hero-pill strong {
  display: block;
  margin-bottom: 6px;
  font-size: 13px;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--muted);
}
.hero-pill span {
  font-size: 17px;
}
.section {
  max-width: 1180px;
  margin: 0 auto;
  padding: 18px 22px 44px;
}
.section-head {
  display: flex;
  justify-content: space-between;
  align-items: end;
  gap: 18px;
  margin-bottom: 22px;
}
.section-head h2 {
  margin: 0;
  font-size: clamp(30px, 4vw, 48px);
  letter-spacing: -.04em;
}
.section-head p {
  margin: 0;
  max-width: 480px;
  color: var(--muted);
  line-height: 1.7;
}
.grid {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: 18px;
}
.card {
  grid-column: span 4;
  padding: 28px;
  border-radius: 28px;
  background: var(--panel);
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
}
.card.wide { grid-column: span 6; }
.card.full { grid-column: span 12; }
.card h3 {
  margin: 0 0 12px;
  font-size: 22px;
  letter-spacing: -.02em;
}
.card p, .card li {
  color: var(--muted);
  font-size: 15px;
  line-height: 1.75;
}
.card ul {
  margin: 12px 0 0;
  padding-left: 18px;
}
.eyebrow {
  margin: 0 0 10px;
  font-size: 12px;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--accent);
}
.visual-card {
  overflow: hidden;
  padding: 18px;
}
.card-image {
  display: block;
  width: 100%;
  margin-bottom: 16px;
  border-radius: 22px;
  aspect-ratio: 16 / 10;
  object-fit: cover;
  background: rgba(255,255,255,0.55);
}
.card-image.tall { aspect-ratio: 4 / 5; }
.card-image.square { aspect-ratio: 1 / 1; }
.card-image.contain {
  object-fit: contain;
  padding: 18px;
}
.card-image.no-crop {
  aspect-ratio: auto;
  height: auto;
  object-fit: contain;
  padding: 0;
  background: transparent;
}
.media-note {
  margin: 0;
  color: var(--muted);
  font-size: 14px;
  line-height: 1.7;
}
.link-card {
  color: inherit;
  text-decoration: none;
  min-height: 250px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  background:
    linear-gradient(160deg, rgba(255,255,255,0.86), rgba(255,255,255,0.58)),
    radial-gradient(circle at top right, color-mix(in srgb, var(--accent) 16%, white), transparent 34%);
  transition: transform .28s ease, box-shadow .28s ease, border-color .28s ease;
}
.link-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 36px 90px rgba(15, 23, 42, 0.12);
  border-color: rgba(17,18,20,0.14);
}
.link-tag {
  display: inline-flex;
  align-self: flex-start;
  padding: 7px 12px;
  border-radius: 999px;
  background: rgba(17,18,20,0.06);
  font-size: 12px;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--muted);
}
.friend-host {
  margin: 0 0 10px;
  font-size: clamp(28px, 4vw, 42px);
  line-height: 1.04;
  letter-spacing: -.04em;
}
.friend-copy {
  margin: 0 0 20px;
  color: var(--muted);
  line-height: 1.75;
}
.friend-arrow {
  font-size: 14px;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--accent);
}
.quote {
  font-size: clamp(24px, 4vw, 42px);
  line-height: 1.24;
  letter-spacing: -.03em;
}
.quote small {
  display: block;
  margin-top: 16px;
  color: var(--muted);
  font-size: 14px;
  letter-spacing: .08em;
  text-transform: uppercase;
}
.timeline {
  display: grid;
  gap: 12px;
}
.timeline-item {
  padding: 16px 0;
  border-top: 1px solid var(--line);
}
.timeline-item:first-child { border-top: 0; padding-top: 0; }
.timeline-item strong {
  display: inline-block;
  min-width: 88px;
  color: var(--accent);
}
.footer {
  max-width: 1180px;
  margin: 0 auto;
  padding: 16px 22px 56px;
  color: var(--muted);
  font-size: 13px;
  line-height: 1.8;
}
.footer a {
  color: inherit;
  text-decoration-color: rgba(17,18,20,.24);
}
@media (max-width: 900px) {
  .card, .card.wide, .card.full { grid-column: span 12; }
  .hero { padding-top: 54px; }
}