:root {
  --bg: #f5f3ee;
  --surface: rgba(255, 255, 255, 0.72);
  --text: #18211d;
  --muted: #69736e;
  --line: rgba(24, 33, 29, 0.12);
  --accent: #116149;
  --accent-soft: #dbe9e2;
  --shadow: 0 18px 50px rgba(34, 45, 40, 0.08);
  font-family: -apple-system, BlinkMacSystemFont, "Hiragino Sans", "Yu Gothic", "Noto Sans JP", sans-serif;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  min-height: 100vh;
  color: var(--text);
  background:
    radial-gradient(circle at 85% -10%, rgba(17, 97, 73, 0.15), transparent 32rem),
    radial-gradient(circle at -10% 25%, rgba(198, 159, 85, 0.12), transparent 28rem),
    var(--bg);
}

a { color: inherit; }

.site-header {
  width: min(1120px, calc(100% - 40px));
  margin: 0 auto;
  padding: 28px 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--line);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  font-weight: 760;
  letter-spacing: -0.02em;
}

.brand-mark {
  display: grid;
  width: 34px;
  height: 34px;
  place-items: center;
  border-radius: 10px;
  color: white;
  background: var(--accent);
}

.tokyo-time {
  display: flex;
  align-items: baseline;
  gap: 10px;
  color: var(--muted);
  font-size: 0.78rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.tokyo-time strong {
  color: var(--text);
  font-size: 1rem;
  font-variant-numeric: tabular-nums;
}

main {
  width: min(1120px, calc(100% - 40px));
  margin: 0 auto;
}

.hero {
  padding: clamp(74px, 11vw, 138px) 0 70px;
  max-width: 800px;
}

.eyebrow {
  margin: 0 0 16px;
  color: var(--accent);
  font-size: 0.74rem;
  font-weight: 800;
  letter-spacing: 0.17em;
}

h1 {
  margin: 0;
  font-size: clamp(2.5rem, 7vw, 5.6rem);
  line-height: 1.04;
  letter-spacing: -0.06em;
}

.lead {
  margin: 24px 0 0;
  color: var(--muted);
  font-size: clamp(1rem, 2vw, 1.2rem);
  line-height: 1.8;
}

.search {
  margin-top: 42px;
  padding: 8px;
  display: grid;
  grid-template-columns: 1fr auto;
  border: 1px solid var(--line);
  border-radius: 18px;
  background: var(--surface);
  box-shadow: var(--shadow);
  backdrop-filter: blur(12px);
}

.search input,
.search button {
  min-height: 50px;
  border: 0;
  border-radius: 12px;
  font: inherit;
}

.search input {
  min-width: 0;
  padding: 0 18px;
  color: var(--text);
  background: transparent;
  outline: none;
}

.search input::placeholder { color: #8a938f; }

.search button {
  padding: 0 24px;
  color: white;
  background: var(--accent);
  cursor: pointer;
  font-weight: 700;
}

.search button:hover { filter: brightness(1.08); }

.link-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
  padding-bottom: 88px;
}

.link-group {
  padding: 26px;
  border: 1px solid var(--line);
  border-radius: 20px;
  background: var(--surface);
  box-shadow: var(--shadow);
  backdrop-filter: blur(12px);
}

.group-heading {
  display: flex;
  align-items: baseline;
  gap: 10px;
  margin-bottom: 20px;
}

.group-heading span {
  color: var(--accent);
  font-size: 0.72rem;
  font-weight: 800;
}

.group-heading h2 {
  margin: 0;
  font-size: 1rem;
}

.link-group nav { display: grid; gap: 8px; }

.link-group a {
  position: relative;
  padding: 11px 34px 11px 12px;
  border-radius: 10px;
  text-decoration: none;
  transition: background 150ms ease, transform 150ms ease;
}

.link-group a::after {
  content: "↗";
  position: absolute;
  right: 12px;
  color: var(--muted);
}

.link-group a:hover {
  background: var(--accent-soft);
  transform: translateX(2px);
}

footer {
  width: min(1120px, calc(100% - 40px));
  margin: 0 auto;
  padding: 30px 0 46px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.78rem;
  line-height: 1.75;
}

footer p { margin: 0; }
.copyright { margin-top: 14px; }

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

@media (max-width: 850px) {
  .link-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 560px) {
  .site-header,
  main,
  footer { width: min(100% - 28px, 1120px); }

  .site-header { padding: 20px 0; }
  .tokyo-time #date { display: none; }
  .hero { padding: 62px 0 48px; }
  .search { margin-top: 32px; }
  .search button { padding: 0 18px; }
  .link-grid { grid-template-columns: 1fr; gap: 14px; padding-bottom: 64px; }
  .link-group { padding: 22px; }
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #101512;
    --surface: rgba(27, 35, 31, 0.78);
    --text: #edf3ef;
    --muted: #a5aea9;
    --line: rgba(237, 243, 239, 0.12);
    --accent: #6ec5a2;
    --accent-soft: rgba(110, 197, 162, 0.13);
    --shadow: 0 18px 50px rgba(0, 0, 0, 0.18);
  }

  .brand-mark,
  .search button { color: #0b1c15; }
}

@media (prefers-reduced-motion: reduce) {
  * { scroll-behavior: auto !important; transition: none !important; }
}