:root {
  /* Gold × Black × White theme */
  --bg: #0a0a0a;
  --bg-grad-1: #0a0a0a;
  --bg-grad-2: #0d0b0b;
  --card: #101010;
  --card-elevated: #141414;
  --text: #eeeeee; /* 少量の白 */
  --muted: #b3a574; /* くすみゴールド */
  --accent: #d4af37; /* メインの金色 */
  --accent-2: #ffd369; /* 明るい金色（ハイライト） */
  --accent-red: #ff4655; /* アクセントの赤（VALORANT系） */
  --border: rgba(212, 175, 55, 0.18);
  --border-strong: rgba(212, 175, 55, 0.35);
  --shadow-gold: 0 0 0 1px rgba(212, 175, 55, 0.25), 0 8px 24px rgba(212, 175, 55, 0.08);
}

* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  font-family: "Inter", system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, "Apple Color Emoji", "Segoe UI Emoji";
  background: linear-gradient(180deg, var(--bg-grad-1), var(--bg-grad-2));
  color: var(--text);
  line-height: 1.6;
}

/* 背景エフェクトの共通レイヤー設定 */
.fx {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
}

/* スポットライト: 上部に当たる微光と円形のグロー */
.fx-spotlight {
  background:
    radial-gradient(1200px 420px at 50% -120px, rgba(255, 214, 120, 0.22), rgba(0,0,0,0) 70%),
    radial-gradient(900px 300px at 50% 0, rgba(255, 70, 85, 0.18), rgba(0,0,0,0) 60%),
    radial-gradient(75% 120% at 50% 20%, rgba(212, 175, 55, 0.06), rgba(0,0,0,0) 60%),
    radial-gradient(800px 140px at 50% 100%, rgba(255, 70, 85, 0.12), rgba(0,0,0,0) 70%);
  mask-image: radial-gradient(100% 80% at 50% 20%, #000 60%, transparent 100%);
}

/* 粒子キャンバスは下地に敷く */
.fx-dust { display:block; position: fixed; inset: 0; z-index: 0; }

/* コンテンツはエフェクトの上に */
header, main, footer { position: relative; z-index: 1; }

.container {
  max-width: 960px;
  margin: 0 auto;
  padding: 24px 16px;
}

h1 {
  font-size: 28px;
  margin: 8px 0 4px;
}

.subtitle { color: var(--muted); margin: 0 0 8px; }

.card {
  background: linear-gradient(180deg, var(--card), var(--card-elevated));
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 16px;
  box-shadow: var(--shadow-gold);
}

.label { display:block; font-weight:600; margin-bottom:6px; }

.input-row { display:flex; gap: 8px; align-items: center; }
#vpInput {
  flex: 1;
  padding: 10px 12px;
  background: #0c0c0c;
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text);
  outline: none;
  transition: border-color .2s ease, box-shadow .2s ease, background .2s ease;
}
#vpInput::placeholder { color: rgba(255,255,255,.35); }
#vpInput:focus {
  border-color: var(--border-strong);
  box-shadow: 0 0 0 3px rgba(212, 175, 55, 0.15);
  background: #0f0f0f;
}

button {
  background: linear-gradient(180deg, #e2c75a, var(--accent));
  color: #111;
  border: 1px solid var(--border-strong);
  border-radius: 8px;
  padding: 10px 14px;
  font-weight: 700;
  cursor: pointer;
  text-shadow: 0 1px 0 rgba(255,255,255,.25);
  box-shadow: 0 6px 16px rgba(212, 175, 55, 0.15), 0 0 0 0 rgba(255, 70, 85, 0);
  transition: transform .06s ease, box-shadow .2s ease, filter .2s ease;
}
button:hover { 
  filter: brightness(1.02);
  box-shadow: 0 10px 22px rgba(212, 175, 55, 0.22), 0 0 0 4px rgba(255, 70, 85, 0.18);
  background: linear-gradient(180deg, #ff7a86, var(--accent-red));
  color: #111;
}
button:active { transform: translateY(1px); }

.hint { color: var(--muted); font-size: 12px; margin-top: 8px; }
.error { color: var(--accent-red); margin-top: 6px; }

.grid {
  margin-top: 16px;
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}

@media (min-width: 800px) {
  .grid { grid-template-columns: 1fr 1fr; }
}

.packs { width: 100%; border-collapse: collapse; }
.packs th, .packs td { border-bottom: 1px solid var(--border); padding: 10px 8px; text-align: left; }
.packs th { color: var(--muted); font-weight: 600; }
.packs td b { color: var(--accent-2); }
.packs .bonus { color: var(--accent-red); font-size: 12px; }
.packs tbody tr:hover { background: rgba(212, 175, 55, 0.06); }

.result p { margin: 8px 0; }
.result .total { font-size: 22px; font-weight: 700; color: var(--accent-2); }
.result .combo { margin-top: 8px; }
.result code { background: #0b0b0b; padding: 2px 6px; border-radius: 6px; border: 1px solid var(--border); color: #f1f1f1; }

.footer { color: var(--muted); text-align:center; }

/* タイトルにさりげない金の下線 */
h1, h2 {
  position: relative;
}
h1::after, h2::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -6px;
  width: 64px;
  height: 2px;
  background: linear-gradient(90deg, var(--accent) 0%, var(--accent) 30%, var(--accent-red) 30%, var(--accent-red) 100%);
  border-radius: 2px;
}