@charset "UTF-8";

/* 常時ダークテーマ */

:root {
  --bg: #0f141b;
  --surface: #171e27;
  --surface-soft: #1d2631;
  --text: #edf2f7;
  --muted: #9aa6b2;
  --border: #2a3440;
  --accent: #9ac45a;
  --accent-dark: #b1d978;
  --shadow: 0 18px 45px rgba(0, 0, 0, 0.28);
  --radius: 22px;
  --content-width: 1120px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background:
    radial-gradient(circle at 10% 0%, rgba(154, 196, 90, 0.12), transparent 28rem),
    var(--bg);
  color: var(--text);
  font-family:
    -apple-system,
    BlinkMacSystemFont,
    "Segoe UI",
    "Hiragino Kaku Gothic ProN",
    "Hiragino Sans",
    "Yu Gothic UI",
    "Yu Gothic",
    Meiryo,
    sans-serif;
  line-height: 1.7;
}

a {
  color: inherit;
}

button {
  font: inherit;
}

.site {
  min-height: 100vh;
}

.hero {
  position: relative;
  overflow: hidden;
  padding: 84px 24px 72px;
  background:
    linear-gradient(135deg, rgba(20, 27, 36, 0.98), rgba(15, 20, 27, 0.96));
  border-top: 4px solid var(--accent);
  border-bottom: 1px solid var(--border);
}

.hero::before {
  content: "< AI / WEB / IDEA / PLAY >";
  position: absolute;
  top: 20px;
  right: 4%;
  font-size: clamp(42px, 7vw, 100px);
  font-weight: 800;
  letter-spacing: -0.04em;
  color: rgba(255, 255, 255, 0.035);
  white-space: nowrap;
  pointer-events: none;
}

.hero-inner {
  position: relative;
  z-index: 1;
  width: min(100%, var(--content-width));
  margin: 0 auto;
}

.eyebrow,
.section-label,
.card-kicker {
  margin: 0;
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.18em;
  color: var(--accent-dark);
}

h1 {
  margin: 14px 0 18px;
  line-height: 1;
}

.brand-main {
  display: block;
  font-size: clamp(48px, 8vw, 92px);
  font-weight: 850;
  letter-spacing: -0.055em;
}

.brand-sub {
  display: block;
  margin-top: 10px;
  font-size: clamp(18px, 2vw, 28px);
  font-weight: 600;
  letter-spacing: 0.08em;
  color: var(--muted);
}

.hero-copy {
  max-width: 720px;
  margin: 28px 0 0;
  font-size: clamp(18px, 2.5vw, 24px);
  font-weight: 500;
  color: #c4ced8;
}

main {
  width: min(calc(100% - 40px), var(--content-width));
  margin: 0 auto;
  padding: 72px 0 84px;
}

.about {
  width: 100%;
  max-width: none;
  margin-bottom: 24px;
  padding: 30px;
  background:
    linear-gradient(135deg, rgba(154, 196, 90, 0.07), transparent 55%),
    var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.about h2,
.intro h2 {
  margin: 8px 0 8px;
  font-size: clamp(28px, 4vw, 42px);
  line-height: 1.25;
  letter-spacing: -0.025em;
}

.about p:last-child,
.intro p:last-child {
  margin: 0;
  color: var(--muted);
  font-size: 16px;
}

.share-panel {
  width: 100%;
  max-width: none;
  margin-bottom: 52px;
  padding: 30px;
  background:
    linear-gradient(135deg, rgba(154, 196, 90, 0.07), transparent 55%),
    var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.share-head {
  margin-bottom: 14px;
}

.share-head h2 {
  margin: 5px 0 0;
  font-size: 20px;
  line-height: 1.35;
}

.share-actions {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 10px;
}

.share-button {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 9px 12px;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: var(--surface-soft);
  color: var(--text);
  text-decoration: none;
  font-size: 13px;
  font-weight: 750;
  line-height: 1.3;
  cursor: pointer;
  transition:
    transform 0.18s ease,
    border-color 0.18s ease,
    background-color 0.18s ease,
    color 0.18s ease;
}

.share-button:hover {
  transform: translateY(-2px);
  border-color: rgba(154, 196, 90, 0.60);
  background: #202a35;
  color: var(--accent-dark);
}

.share-button:focus-visible,
a.content-link:focus-visible,
footer a:focus-visible {
  outline: 2px solid var(--accent-dark);
  outline-offset: 3px;
}

.copy-status {
  min-height: 1.5em;
  margin: 10px 0 0;
  color: var(--accent-dark);
  font-size: 12px;
  font-weight: 700;
}

.intro {
  max-width: 760px;
  margin-bottom: 34px;
}

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

.category-card {
  position: relative;
  overflow: hidden;
  padding: 30px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.category-card::after {
  content: "";
  position: absolute;
  inset: auto -50px -70px auto;
  width: 180px;
  height: 180px;
  border-radius: 50%;
  background: rgba(154, 196, 90, 0.07);
  pointer-events: none;
}

.card-icon {
  display: grid;
  place-items: center;
  width: 52px;
  height: 52px;
  margin-bottom: 24px;
  border-radius: 16px;
  background: rgba(154, 196, 90, 0.12);
  color: var(--accent-dark);
  font-size: 21px;
  font-weight: 800;
}

.card-head {
  margin-bottom: 22px;
}

.card-head h3 {
  margin: 5px 0 0;
  font-size: 28px;
  line-height: 1.3;
}

.link-list {
  display: grid;
  gap: 10px;
}

.content-link {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  min-height: 78px;
  padding: 16px 18px;
  border: 1px solid var(--border);
  border-radius: 16px;
  background: var(--surface-soft);
  text-decoration: none;
  transition:
    transform 0.18s ease,
    border-color 0.18s ease,
    background-color 0.18s ease,
    box-shadow 0.18s ease;
}

a.content-link:hover {
  transform: translateY(-3px);
  border-color: rgba(154, 196, 90, 0.60);
  background: #202a35;
  box-shadow: 0 12px 28px rgba(0, 0, 0, 0.25);
}

.content-link strong {
  display: block;
  font-size: 16px;
  line-height: 1.45;
}

.content-link small {
  display: block;
  margin-top: 4px;
  color: var(--muted);
  font-size: 13px;
  line-height: 1.5;
}

.arrow {
  flex: 0 0 auto;
  color: var(--accent-dark);
  font-size: 22px;
  font-weight: 700;
  transition: transform 0.18s ease;
}

a.content-link:hover .arrow {
  transform: translateX(4px);
}

.disabled {
  cursor: default;
  opacity: 0.72;
}

.badge {
  flex: 0 0 auto;
  padding: 5px 8px;
  border-radius: 999px;
  background: rgba(154, 196, 90, 0.14);
  color: var(--accent-dark);
  font-size: 10px;
  font-weight: 800;
  letter-spacing: 0.08em;
  white-space: nowrap;
}

footer {
  padding: 28px 24px 42px;
  border-top: 1px solid var(--border);
  text-align: center;
  color: var(--muted);
  font-size: 13px;
}

footer p {
  margin: 0;
}

footer a {
  margin-left: 6px;
  color: var(--text);
  text-decoration: none;
}

footer a:hover {
  color: var(--accent-dark);
  text-decoration: underline;
}

@media (max-width: 760px) {
  .hero {
    padding: 58px 20px 48px;
  }

  .hero::before {
    top: 16px;
    right: -30px;
    font-size: 54px;
  }

  .desktop-only {
    display: none;
  }

  main {
    width: min(calc(100% - 28px), var(--content-width));
    padding: 50px 0 60px;
  }

  .about {
    padding: 24px;
  }

  .share-panel {
    padding: 20px;
  }

  .share-actions {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .share-copy {
    grid-column: 1 / -1;
  }

  .content-grid {
    grid-template-columns: 1fr;
  }

  .category-card {
    padding: 24px;
  }

  .content-link {
    align-items: flex-start;
  }
}

@media (max-width: 480px) {
  .brand-main {
    font-size: 46px;
  }

  .brand-sub {
    font-size: 17px;
  }

  .hero-copy {
    font-size: 17px;
  }

  .about h2,
  .intro h2 {
    font-size: 30px;
  }

  .about p:last-child,
  .intro p:last-child {
    font-size: 15px;
  }

  .card-head h3 {
    font-size: 24px;
  }

  .content-link {
    min-height: 0;
    padding: 15px;
  }

  .content-link small {
    font-size: 12px;
  }

  .badge {
    font-size: 9px;
  }
}