/* ============================================================
   NOVA 公式サイト
   宇宙テーマ / ダーク / レスポンシブ
   ============================================================ */

:root {
  --bg: #05060f;
  --bg-2: #0b0f2a;
  --panel: rgba(20, 28, 58, 0.65);
  --panel-border: rgba(96, 130, 255, 0.25);
  --text: #e2e8f0;
  --text-dim: #94a3b8;
  --cyan: #22d3ee;
  --gold: #fbbf24;
  --magenta: #e879f9;
  --green: #4ade80;
  --red: #f87171;
  --mono: "SF Mono", "JetBrains Mono", "Menlo", "Consolas", "Courier New", monospace;
  --sans: system-ui, -apple-system, "Segoe UI", "Hiragino Sans", "Noto Sans JP", sans-serif;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  background: radial-gradient(1200px 600px at 70% -10%, #141b3f 0%, transparent 60%),
              radial-gradient(900px 500px at 10% 10%, #1a1033 0%, transparent 55%),
              var(--bg);
  color: var(--text);
  font-family: var(--sans);
  line-height: 1.7;
  overflow-x: hidden;
}

/* ── 星背景 ── */
#stars {
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
}
#stars i {
  position: absolute;
  border-radius: 50%;
  background: #fff;
  animation: twinkle var(--dur, 3s) ease-in-out infinite;
  animation-delay: var(--delay, 0s);
}
@keyframes twinkle {
  0%, 100% { opacity: 0.15; transform: scale(0.8); }
  50% { opacity: 1; transform: scale(1.15); }
}

/* ── ナビゲーション ── */
.nav {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.9rem clamp(1rem, 4vw, 3rem);
  background: rgba(5, 6, 15, 0.75);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--panel-border);
}
.nav-logo {
  font-family: var(--mono);
  font-weight: 700;
  color: var(--cyan);
  text-decoration: none;
  letter-spacing: 1px;
}
.nav-links { display: flex; align-items: center; gap: clamp(0.6rem, 2vw, 1.4rem); flex-wrap: wrap; }
.nav-links a {
  color: var(--text-dim);
  text-decoration: none;
  font-size: 0.9rem;
  transition: color 0.2s;
}
.nav-links a:hover { color: var(--cyan); }

/* ── ボタン ── */
.btn-primary {
  display: inline-block;
  padding: 0.7rem 1.6rem;
  background: linear-gradient(135deg, var(--cyan), #0ea5e9);
  color: #04121a;
  font-weight: 700;
  border-radius: 8px;
  text-decoration: none;
  box-shadow: 0 0 24px rgba(34, 211, 238, 0.35);
  transition: transform 0.2s, box-shadow 0.2s;
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 0 36px rgba(34, 211, 238, 0.55); }
.btn-ghost {
  display: inline-block;
  padding: 0.7rem 1.4rem;
  border: 1px solid var(--panel-border);
  border-radius: 8px;
  color: var(--text);
  text-decoration: none;
  font-size: 0.9rem;
  transition: border-color 0.2s, color 0.2s;
}
.btn-ghost:hover { border-color: var(--cyan); color: var(--cyan); }

/* ── ヒーロー ── */
.hero {
  min-height: 92vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 4rem 1.5rem;
  position: relative;
}
.hero-ship { position: absolute; top: 16%; left: 0; width: 100%; height: 3px; opacity: 0.5; }
.hero-ship .ship {
  position: absolute;
  left: 12%;
  color: var(--cyan);
  animation: drift 14s linear infinite;
}
.hero-ship .shot {
  position: absolute;
  left: 18%;
  color: var(--gold);
  animation: shot 14s linear infinite;
}
@keyframes drift { 0% { transform: translateX(0) translateY(0); } 50% { transform: translateX(60vw) translateY(-18px); } 100% { transform: translateX(0) translateY(0); } }
@keyframes shot { 0%, 10% { opacity: 0; transform: translateY(0); } 12% { opacity: 1; transform: translateY(-40px); } 40% { opacity: 0; transform: translateY(-40px); } 100% { opacity: 0; } }

.hero-title {
  font-family: var(--mono);
  color: var(--gold);
  font-size: clamp(0.6rem, 1.6vw, 0.95rem);
  line-height: 1.25;
  text-shadow: 0 0 18px rgba(251, 191, 36, 0.5);
  margin-bottom: 1.2rem;
  user-select: none;
}
.hero-wordmark {
  font-family: var(--mono);
  font-size: clamp(2rem, 6vw, 4.2rem);
  letter-spacing: 4px;
  background: linear-gradient(180deg, #fff 20%, var(--cyan) 60%, #0891b2);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  text-shadow: 0 0 40px rgba(34, 211, 238, 0.35);
}
.hero-tag {
  margin-top: 1.2rem;
  color: var(--text-dim);
  font-size: clamp(0.95rem, 1.6vw, 1.15rem);
}
.hero-cmd {
  margin-top: 2.2rem;
  display: inline-flex;
  align-items: center;
  gap: 0;
  border: 1px solid var(--panel-border);
  border-radius: 10px;
  background: var(--panel);
  overflow: hidden;
}
.hero-cmd code {
  font-family: var(--mono);
  color: var(--green);
  padding: 0.8rem 1.2rem;
  font-size: clamp(0.85rem, 2vw, 1.05rem);
}
.hero-cmd button {
  border: none;
  border-left: 1px solid var(--panel-border);
  background: rgba(34, 211, 238, 0.12);
  color: var(--cyan);
  font-family: var(--mono);
  font-size: 0.75rem;
  font-weight: 700;
  padding: 0.8rem 1rem;
  cursor: pointer;
  transition: background 0.2s;
}
.hero-cmd button:hover { background: rgba(34, 211, 238, 0.28); }
.hero-cmd button.copied { color: var(--green); }
.hero-sub { margin-top: 1rem; color: var(--text-dim); font-size: 0.9rem; }
.hero-actions { margin-top: 2.4rem; display: flex; gap: 1rem; flex-wrap: wrap; justify-content: center; }

/* ── セクション共通 ── */
.section {
  max-width: 1080px;
  margin: 0 auto;
  padding: 5rem 1.5rem;
}
.section-title {
  font-family: var(--mono);
  font-size: clamp(1.5rem, 3.5vw, 2.2rem);
  color: var(--cyan);
  text-align: center;
  letter-spacing: 3px;
  margin-bottom: 0.4rem;
}
.section-title span {
  display: block;
  font-family: var(--sans);
  font-size: 0.9rem;
  color: var(--text-dim);
  letter-spacing: 2px;
  margin-top: 0.4rem;
}

/* ── カード ── */
.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1.2rem;
  margin-top: 2.5rem;
}
.card {
  background: var(--panel);
  border: 1px solid var(--panel-border);
  border-radius: 14px;
  padding: 1.6rem;
  transition: transform 0.25s, border-color 0.25s, box-shadow 0.25s;
}
.card:hover {
  transform: translateY(-6px);
  border-color: var(--cyan);
  box-shadow: 0 10px 40px rgba(34, 211, 238, 0.15);
}
.card-emoji { font-size: 2rem; margin-bottom: 0.6rem; }
.card h3 { font-size: 1.1rem; margin-bottom: 0.5rem; color: #fff; }
.card p { color: var(--text-dim); font-size: 0.92rem; }
.card-tag {
  display: inline-block;
  margin-top: 0.9rem;
  font-family: var(--mono);
  font-size: 0.75rem;
  color: var(--cyan);
  border: 1px solid rgba(34, 211, 238, 0.3);
  padding: 0.2rem 0.6rem;
  border-radius: 20px;
}

/* ── デモ ── */
.section-demo { text-align: center; }
.demo-hint { color: var(--text-dim); font-size: 0.9rem; margin-top: 0.8rem; }
.demo-wrap {
  margin: 1.6rem auto 0;
  max-width: 520px;
  border: 1px solid var(--panel-border);
  border-radius: 12px;
  background: var(--bg);
  overflow: hidden;
  box-shadow: 0 0 40px rgba(34, 211, 238, 0.08);
}
#demo-field {
  font-family: var(--mono);
  font-size: clamp(0.6rem, 1.7vw, 0.85rem);
  line-height: 1.15;
  padding: 0.9rem 1rem;
  text-align: left;
  color: var(--text);
  min-height: 200px;
}
.demo-hud {
  font-family: var(--mono);
  font-size: 0.8rem;
  text-align: left;
  padding: 0.5rem 1rem;
  border-top: 1px solid var(--panel-border);
  color: var(--text-dim);
  background: var(--panel);
}
.demo-focus { margin-top: 0.9rem; color: var(--text-dim); font-size: 0.78rem; }

/* ── 操作キー ── */
.key-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 1.2rem;
  margin-top: 2.5rem;
}
.key {
  text-align: center;
  background: var(--panel);
  border: 1px solid var(--panel-border);
  border-radius: 12px;
  padding: 1.2rem 0.8rem;
}
.key kbd {
  display: inline-block;
  font-family: var(--mono);
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--cyan);
  background: rgba(34, 211, 238, 0.1);
  border: 1px solid rgba(34, 211, 238, 0.35);
  border-bottom-width: 3px;
  border-radius: 6px;
  padding: 0.25rem 0.6rem;
  margin: 0.15rem;
}
.key p { margin-top: 0.5rem; color: var(--text-dim); font-size: 0.85rem; }

/* ── アイテム ── */
.cards-3 { grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); }
.card-item { text-align: center; }
.item-icon {
  font-family: var(--mono);
  font-size: 2.6rem;
  line-height: 1.2;
  margin-bottom: 0.6rem;
  display: inline-block;
}
.item-life { color: var(--green); text-shadow: 0 0 18px rgba(74, 222, 128, 0.6); }
.item-power { color: var(--cyan); text-shadow: 0 0 18px rgba(34, 211, 238, 0.6); }
.item-od { color: var(--gold); text-shadow: 0 0 18px rgba(251, 191, 36, 0.6); }
.item-note { margin-top: 1.6rem; text-align: center; color: var(--text-dim); }
.item-note strong { color: var(--gold); }

/* ── インストール ── */
.install-block {
  max-width: 640px;
  margin: 2rem auto 0;
  background: var(--panel);
  border: 1px solid var(--panel-border);
  border-radius: 14px;
  padding: 2rem;
  text-align: center;
}
.install-block p { color: var(--text-dim); margin-bottom: 0.8rem; }
.code {
  font-family: var(--mono);
  text-align: left;
  background: #0a0f24;
  border: 1px solid var(--panel-border);
  border-radius: 10px;
  padding: 1rem 1.2rem;
  color: var(--green);
  margin: 0.8rem 0 1.4rem;
  overflow-x: auto;
  line-height: 1.6;
}
.install-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  justify-content: center;
  color: var(--text-dim);
  font-size: 0.85rem;
  margin-top: 1.4rem;
}

/* ── フッター ── */
.footer {
  border-top: 1px solid var(--panel-border);
  text-align: center;
  padding: 2.5rem 1.5rem;
  color: var(--text-dim);
  font-size: 0.9rem;
}
.footer p { margin: 0.3rem 0; }
.footer a { color: var(--cyan); text-decoration: none; }
.footer a:hover { text-decoration: underline; }
.footer-license { font-size: 0.78rem; opacity: 0.7; }

/* ── レスポンシブ ── */
@media (max-width: 640px) {
  .nav-links a:nth-child(n+2) { display: none; }
  .hero { min-height: 85vh; }
  .section { padding: 3.5rem 1.2rem; }
}

/* ── スクロール出現アニメーション ── */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}
.reveal.visible { opacity: 1; transform: translateY(0); }

@media (prefers-reduced-motion: reduce) {
  #stars i, .hero-ship { animation: none !important; }
  .reveal { transition: none; opacity: 1; transform: none; }
}