/* ============================================
 * StudyQuest 共通テーマ変数
 * 全アプリ（spell/bun/kan）で読み込む
 * ============================================ */

:root {
  /* 基本カラー */
  --sq-bg: #0c1025;
  --sq-bg-panel: #181c36;
  --sq-bg-panel-hi: #22274a;
  --sq-border: #2c3050;

  /* ゴールド（StudyQuest共通ブランドカラー） */
  --sq-gold: #ffd23f;
  --sq-gold-dark: #c68a0f;
  --sq-gold-glow: rgba(255, 210, 63, 0.35);
  --sq-gold-border: rgba(255, 210, 63, 0.22);

  /* 各アプリのアクセント色 */
  --sq-spell: #ffd23f;    /* 英雄のゴールド */
  --sq-spell-glow: rgba(255, 210, 63, 0.4);
  --sq-bun: #c0392b;       /* 古都の朱赤 */
  --sq-bun-glow: rgba(192, 57, 43, 0.4);
  --sq-kan: #5a7fb0;       /* 漢の墨藍 */
  --sq-kan-glow: rgba(90, 127, 176, 0.4);

  /* 汎用 */
  --sq-accent-2: #5ddca8;
  --sq-danger: #ff5d6c;
  --sq-text: #f2f3f8;
  --sq-text-dim: #8a90a8;

  /* フォント */
  --sq-font-base: "Hiragino Sans", "Yu Gothic", "Meiryo", system-ui, sans-serif;
  --sq-font-latin: "Cinzel", "Times New Roman", serif;
  --sq-font-jp-heading: "Shippori Mincho", "Yu Mincho", "Hiragino Mincho Pro", serif;
}

/* ============================================
 * StudyQuest ブレッドクラム（各アプリから「◀ StudyQuest」で戻る）
 * ============================================ */
.sq-breadcrumb {
  position: relative;
  z-index: 6;
  display: flex;
  justify-content: center;
  padding:
    calc(6px + env(safe-area-inset-top)) 12px
    6px 12px;
  background: rgba(10, 12, 24, 0.85);
  backdrop-filter: blur(6px);
  border-bottom: 1px solid var(--sq-border);
}
.sq-back-link {
  font-family: var(--sq-font-latin);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 2px;
  color: var(--sq-text-dim);
  text-decoration: none;
  padding: 4px 12px;
  border-radius: 999px;
  transition: color 0.15s, background 0.15s;
}
.sq-back-link:hover,
.sq-back-link:focus {
  color: var(--sq-gold);
  background: rgba(255, 210, 63, 0.08);
}
.sq-back-link .sq-back-arrow {
  display: inline-block;
  margin-right: 4px;
  transition: transform 0.15s;
}
.sq-back-link:hover .sq-back-arrow {
  transform: translateX(-3px);
}

/* 共通背景: 星空テクスチャ */
.sq-starfield::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  background-image:
    radial-gradient(1.5px 1.5px at 15% 23%, rgba(255,255,255,0.45), transparent 50%),
    radial-gradient(1px   1px   at 42% 67%, rgba(255,210,63,0.4),  transparent 50%),
    radial-gradient(1px   1px   at 68% 18%, rgba(255,255,255,0.3), transparent 50%),
    radial-gradient(1.5px 1.5px at 83% 52%, rgba(255,255,255,0.35),transparent 50%),
    radial-gradient(1px   1px   at 27% 78%, rgba(255,210,63,0.3),  transparent 50%),
    radial-gradient(1px   1px   at 55% 38%, rgba(255,255,255,0.25),transparent 50%),
    radial-gradient(1.5px 1.5px at 92% 81%, rgba(255,255,255,0.4), transparent 50%),
    radial-gradient(1px   1px   at 8% 60%,  rgba(255,210,63,0.3),  transparent 50%),
    radial-gradient(1px   1px   at 74% 90%, rgba(255,255,255,0.2), transparent 50%);
  background-size: 700px 700px;
  background-repeat: repeat;
  opacity: 0.7;
}