:root {
  --bg0: #070b12;
  --bg1: #0b1320;
  --panel: rgba(12, 22, 34, 0.94);
  --line: rgba(115, 255, 214, 0.24);
  --goldLine: rgba(229, 191, 112, 0.32);
  --text: #eef7ff;
  --muted: #aab8c8;
  --aura: #68f6d2;
  --gold: #e7c36f;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
  max-width: 100%;
  overflow-x: hidden;
  background:
    radial-gradient(circle at 50% 0%, rgba(82, 246, 210, 0.13), transparent 32rem),
    radial-gradient(circle at 15% 25%, rgba(231, 195, 111, 0.12), transparent 28rem),
    linear-gradient(180deg, var(--bg0), var(--bg1));
  color: var(--text);
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", "Yu Gothic", "YuGothic", "Hiragino Sans", "Noto Sans JP", sans-serif;
  line-height: 1.8;
}

a {
  color: var(--aura);
}

.kd-shell {
  width: min(1120px, calc(100vw - 40px));
  margin: 0 auto;
  padding: 28px 0 56px;
}

.kd-topbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 14px;
  padding: 14px 0 22px;
}

.kd-brand strong,
.kd-brand small {
  display: block;
}

.kd-brand small {
  color: var(--muted);
}

.kd-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  justify-content: flex-end;
}

.kd-nav a {
  display: inline-flex;
  justify-content: center;
  align-items: center;
  min-height: 42px;
  padding: 9px 14px;
  border-radius: 999px;
  border: 1px solid var(--line);
  color: var(--text);
  text-decoration: none;
  background: rgba(104, 246, 210, 0.08);
  font-weight: 700;
  text-align: center;
  line-height: 1.25;
}

.kd-hero {
  margin: 18px 0 20px;
  padding: clamp(26px, 6vw, 56px);
  border-radius: 30px;
  border: 1px solid var(--line);
  background:
    linear-gradient(135deg, rgba(104, 246, 210, 0.12), rgba(231, 195, 111, 0.06)),
    rgba(7, 14, 25, 0.86);
  box-shadow: 0 30px 90px rgba(0, 0, 0, 0.34);
}

.kd-kicker {
  display: inline-flex;
  max-width: 100%;
  padding: 6px 12px;
  border-radius: 999px;
  border: 1px solid var(--goldLine);
  color: var(--gold);
  background: rgba(231, 195, 111, 0.08);
  font-weight: 800;
  overflow-wrap: anywhere;
}

.kd-title {
  margin: 18px 0 10px;
  font-size: clamp(2.25rem, 7vw, 5.2rem);
  line-height: 1.04;
  overflow-wrap: anywhere;
  word-break: keep-all;
}

.kd-lead {
  max-width: 860px;
  margin: 0;
  color: #dbe8f3;
  font-size: clamp(1rem, 2vw, 1.18rem);
}

.kd-section-title {
  margin: 28px 0 12px;
  color: var(--aura);
  font-size: clamp(1.45rem, 4vw, 2.15rem);
  line-height: 1.22;
}

.kd-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
  margin: 18px 0;
}

.kd-grid-3 {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.kd-plan-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 12px;
  margin: 18px 0;
}

.kd-card,
.kd-plan {
  min-width: 0;
  padding: 22px;
  border-radius: 24px;
  border: 1px solid var(--line);
  background: var(--panel);
  box-shadow: 0 18px 46px rgba(0, 0, 0, 0.22);
}

.kd-card.gold,
.kd-note {
  border-color: var(--goldLine);
  background: rgba(31, 25, 14, 0.62);
}

.kd-card h2,
.kd-card h3,
.kd-plan strong {
  margin: 0 0 10px;
  line-height: 1.25;
  overflow-wrap: anywhere;
}

.kd-card p,
.kd-plan p {
  margin: 0.35em 0;
}

.kd-plan strong {
  display: block;
  color: var(--aura);
}

.kd-note {
  margin-top: 18px;
  padding: 16px 18px;
  border-radius: 18px;
  color: #f6e7c8;
}

.kd-list {
  margin: 0.4em 0 0;
  padding-left: 1.25em;
}

.kd-footer {
  margin-top: 34px;
  padding: 20px 0;
  color: var(--muted);
  border-top: 1px solid rgba(255,255,255,0.08);
  font-size: 0.92rem;
}

@media (max-width: 820px) {
  .kd-shell {
    width: min(100%, calc(100vw - 24px));
    padding: 14px 0 36px;
  }

  .kd-topbar {
    align-items: flex-start;
    flex-direction: column;
    gap: 12px;
    padding-bottom: 14px;
  }

  .kd-nav {
    width: 100%;
    justify-content: flex-start;
  }

  .kd-nav a {
    flex: 1 1 calc(50% - 8px);
    padding: 10px 9px;
    font-size: 0.92rem;
  }

  .kd-hero {
    margin: 10px 0 16px;
    padding: 22px 16px;
    border-radius: 22px;
  }

  .kd-title {
    font-size: clamp(1.95rem, 11.5vw, 3.1rem);
    line-height: 1.08;
  }

  .kd-lead {
    font-size: 1rem;
    line-height: 1.75;
  }

  .kd-grid,
  .kd-grid-3,
  .kd-plan-grid {
    grid-template-columns: 1fr;
  }

  .kd-card,
  .kd-plan {
    padding: 16px;
    border-radius: 20px;
  }
}

@media (max-width: 420px) {
  .kd-nav a {
    flex-basis: 100%;
  }

  .kd-title {
    font-size: clamp(1.8rem, 12vw, 2.55rem);
  }

  .kd-kicker {
    font-size: 0.82rem;
  }
}