:root {
  /* 和モダン・カラーパレット */
  --bg-dark: #0d1321;       /* 勝色 */
  --bg-panel: #161e2e;      /* 鉄御納戸 */
  --bg-input: #232d3f;
  
  --text-main: #f2ebd4;     /* 生成色 */
  --text-muted: #94a3b8;    /* 銀鼠 */
  
  --primary: #c93a40;       /* 赤紅 */
  --primary-hover: #e04a50;
  
  --accent-gold: #c5a059;   /* 枯茶 */
  --accent-teal: #246875;   /* 青碧 */
  
  --correct: #556b2f;       /* 苔色 */
  --wrong: #803030;         /* 蘇芳 */
  
  --border: #3a4759;
  --radius: 4px;
  
  /* フォントスタック */
  --font-serif: "Shippori Mincho", "Noto Serif JP", serif;
  --font-sans: "Noto Sans JP", sans-serif;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: var(--font-serif);
  background-color: var(--bg-dark);
  color: var(--text-main);
  line-height: 1.8;
  min-height: 100vh;
  padding-bottom: 80px;
  background-image: 
    radial-gradient(circle at 50% 50%, #161e2e 0%, transparent 100%),
    repeating-linear-gradient(45deg, rgba(255,255,255,0.01) 0px, rgba(255,255,255,0.01) 1px, transparent 1px, transparent 10px);
}

.hidden { display: none !important; }

/* ログイン画面 */
.login-overlay {
  position: fixed; top: 0; left: 0; width: 100%; height: 100%;
  background: rgba(13, 19, 33, 0.95);
  backdrop-filter: blur(5px);
  z-index: 9999;
  display: flex; justify-content: center; align-items: center;
}
.login-card {
  background: var(--bg-panel);
  border: 1px solid var(--accent-gold);
  box-shadow: 0 0 40px rgba(0,0,0,0.6);
  padding: 48px; width: 100%; max-width: 420px;
  text-align: center;
  position: relative;
}
.login-logo {
  font-size: 3rem; color: var(--primary);
  font-weight: 900; margin-bottom: 16px;
  text-shadow: 0 0 10px rgba(201, 58, 64, 0.3);
}
.login-title { font-size: 1.4rem; letter-spacing: 0.2em; margin: 0 0 8px; border-bottom: 1px solid var(--border); display: inline-block; padding-bottom: 8px; }
.login-sub { color: var(--text-muted); font-size: 0.85rem; margin-bottom: 40px; }
.login-input {
  width: 100%; padding: 12px; background: var(--bg-input);
  border: 1px solid var(--border); color: var(--text-main);
  text-align: center; font-size: 1.1rem; font-family: var(--font-serif);
  border-bottom: 2px solid var(--accent-gold);
}
.login-input:focus { outline: none; background: #2a364a; }
.login-error { color: var(--primary); font-size: 0.9rem; margin-top: 12px; }

/* ヘッダー */
.topbar {
  display: flex; justify-content: space-between; align-items: center;
  padding: 16px 32px;
  background: rgba(22, 30, 46, 0.95);
  border-bottom: 2px solid var(--border);
  position: sticky; top: 0; z-index: 100;
  box-shadow: 0 4px 12px rgba(0,0,0,0.3);
}
.brand { display: flex; align-items: center; gap: 16px; }
.logo-stamp {
  width: 42px; height: 42px;
  background: var(--primary); color: #fff;
  border-radius: 4px; display: grid; place-items: center;
  font-weight: 900; font-size: 1.2rem; border: 2px solid #fff;
}
.title-group { display: flex; flex-direction: column; }
.title { font-size: 1.2rem; font-weight: 700; letter-spacing: 0.1em; }
.subtitle { font-size: 0.75rem; color: var(--text-muted); letter-spacing: 0.05em; font-family: var(--font-sans); }

.user-status { display: flex; align-items: center; gap: 24px; font-family: var(--font-sans); }
.status-item { text-align: right; }
.status-label { font-size: 0.7rem; color: var(--text-muted); display: block; }
.status-val { font-size: 1.1rem; color: var(--accent-gold); font-weight: 700; font-family: var(--font-serif); }
.xp-bar-container { width: 120px; height: 4px; background: #333; margin-top: 4px; }
.xp-bar-fill { height: 100%; background: var(--accent-gold); width: 0%; transition: width 0.5s; }
.btn-logout { font-size: 0.8rem; color: var(--text-muted); border: 1px solid var(--border); padding: 4px 10px; cursor: pointer; background: transparent; }

/* メインレイアウト */
.container { max-width: 960px; margin: 40px auto; padding: 0 24px; }
.card {
  background: var(--bg-panel);
  border: 1px solid var(--border);
  padding: 40px; margin-bottom: 40px;
  position: relative;
  box-shadow: 0 8px 24px rgba(0,0,0,0.4);
}
.card::before {
  content: ""; position: absolute; top: 0; left: 0; width: 4px; height: 100%; background: var(--border);
}

.h1 { font-size: 1.6rem; margin: 0 0 32px; border-bottom: 1px solid var(--border); padding-bottom: 12px; display: inline-block; color: var(--text-main); }

.grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 24px; margin-bottom: 40px; }
.field label { display: block; font-size: 0.85rem; color: var(--accent-gold); margin-bottom: 8px; font-weight: 700; }
select {
  width: 100%; padding: 12px; background: var(--bg-input);
  border: 1px solid var(--border); color: var(--text-main);
  border-radius: 0; font-family: var(--font-sans); font-size: 1rem;
  cursor: pointer;
}
select:focus { outline: 1px solid var(--accent-gold); }

/* ボタン */
.btn {
  border: none; padding: 14px 32px;
  font-family: var(--font-serif); font-weight: 700; font-size: 1.05rem;
  cursor: pointer; transition: all 0.2s;
  letter-spacing: 0.1em; border-radius: 2px;
  display: inline-flex; justify-content: center; align-items: center;
}
.btn:active { transform: translateY(2px); }
.btn-primary {
  background: var(--primary); color: #fff;
  box-shadow: 0 4px 10px rgba(201, 58, 64, 0.4);
  border-bottom: 3px solid #912328;
}
.btn-primary:hover { background: var(--primary-hover); }
.btn-primary:disabled { background: #555; border-color: #333; cursor: not-allowed; box-shadow: none; border-bottom: none; transform: none; }

.btn-ghost { background: transparent; border: 1px solid var(--border); color: var(--text-muted); }
.btn-ghost:hover { border-color: var(--text-main); color: var(--text-main); }
.btn-next {
  background: var(--accent-teal); color: #fff;
  box-shadow: 0 4px 10px rgba(36, 104, 117, 0.4);
  border-bottom: 3px solid #164650;
}

.action-area { display: flex; gap: 16px; margin-top: 32px; flex-wrap: wrap; }
.center-area { justify-content: center; }

/* 称号バッジ */
.badge-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(120px, 1fr)); gap: 16px; margin-top: 24px; }
.badge-item {
  border: 1px solid var(--border); background: rgba(0,0,0,0.2);
  padding: 16px 8px; text-align: center; opacity: 0.5; transition: all 0.3s;
}
.badge-item.unlocked { opacity: 1; border-color: var(--accent-gold); background: rgba(197, 160, 89, 0.1); }
.badge-icon { font-size: 2rem; display: block; margin-bottom: 8px; color: var(--accent-gold); }
.badge-name { font-size: 0.85rem; font-weight: 700; display: block; font-family: var(--font-sans); }

/* クイズ画面 */
.split-view { display: grid; grid-template-columns: 1.1fr 0.9fr; gap: 40px; }
@media(max-width:800px){ .split-view { grid-template-columns: 1fr; } }

.passage-box { 
  background: var(--bg-input); padding: 24px; 
  border-left: 4px solid var(--border); 
  line-height: 2.2; font-size: 1.1rem; 
}
.sentence { padding: 2px 0; }
.sentence.highlight { background: rgba(197, 160, 89, 0.15); border-bottom: 2px solid var(--accent-gold); }

.q-box { padding-top: 10px; }
.qstem { font-weight: 700; font-size: 1.2rem; margin-bottom: 24px; line-height: 1.6; }

/* ★選択肢レイアウト修正（Gridで位置合わせ） */
.choices { display: flex; flex-direction: column; gap: 16px; }
.choice {
  display: grid;
  grid-template-columns: 42px 1fr; /* 漢数字幅固定 */
  align-items: center;
  gap: 12px;
  padding: 16px; 
  background: var(--bg-input);
  border: 1px solid var(--border); 
  cursor: pointer; 
  transition: all 0.2s;
  width: 100%;
}
.choice:hover { border-color: var(--accent-gold); }
.choice.selected { border-color: var(--accent-gold); background: rgba(197, 160, 89, 0.1); }
.choice.correct { border-color: var(--correct); background: rgba(85, 107, 47, 0.2); }
.choice.wrong { border-color: var(--wrong); background: rgba(128, 48, 48, 0.2); }

.choice-marker { 
  color: var(--accent-gold); 
  font-weight: 900; 
  font-family: var(--font-serif);
  font-size: 1.2rem;
  border: 1px solid var(--accent-gold);
  width: 36px; height: 36px;
  border-radius: 50%;
  /* Flexboxで上下左右中央揃え */
  display: flex; justify-content: center; align-items: center;
}
.choice.selected .choice-marker { background: var(--accent-gold); color: var(--bg-dark); }

.feedback-status {
  margin-top: 24px; padding: 16px; text-align: center; 
  font-weight: 700; font-size: 1.2rem; border: 1px solid;
}
.feedback-status.good { color: #8fbc8f; border-color: #8fbc8f; }
.feedback-status.bad { color: #e9967a; border-color: #e9967a; }

.explain-box { margin-top: 20px; padding: 20px; background: rgba(0,0,0,0.2); border-top: 1px solid var(--border); }

/* 結果画面（位置ズレ修正） */
.result-circle {
  width: 180px; height: 180px; border-radius: 50%;
  border: 4px solid var(--bg-input); 
  border-top-color: var(--primary); border-left-color: var(--primary);
  /* Flexboxで完全中央揃え */
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  margin: 0 auto 32px;
  color: #fff;
  box-shadow: 0 0 20px rgba(0,0,0,0.5);
  background: var(--bg-input);
}
.res-value { font-size: 2.8rem; font-weight: 700; line-height: 1; margin-bottom: 4px; }
.res-label { font-size: 0.8rem; color: var(--text-muted); }

/* 昇段通知 */
.levelup-overlay {
  position: fixed; top: 0; left: 0; width: 100%; height: 100%;
  background: rgba(0,0,0,0.9); z-index: 10000;
  display: flex; flex-direction: column; justify-content: center; align-items: center;
}
.levelup-title { font-size: 2rem; color: var(--accent-gold); margin-bottom: 16px; letter-spacing: 0.5em; }
.levelup-val { font-size: 5rem; font-weight: 900; color: #fff; text-shadow: 0 0 30px var(--primary); margin-bottom: 32px; }

.footer {
  position: fixed; bottom: 0; width: 100%; text-align: center;
  padding: 12px; background: var(--bg-dark); color: var(--text-muted); font-size: 0.75rem;
  border-top: 1px solid var(--border);
}

/* Guest Login Button */
.btn-guest {
  background: transparent;
  color: var(--text-main);
  border: 1px solid var(--accent-gold);
  width: 100%;
  padding: 12px;
  border-radius: 4px;
  font-weight: bold;
  transition: all 0.2s;
  cursor: pointer;
}
.btn-guest:hover {
  background: rgba(197, 160, 89, 0.1);
}

/* 他のCSSは以前のままでOKですが、Googleボタン用のスタイルを再掲 */
.btn-google {
  background: #fff; color: #333;
  width: 100%; border: none; padding: 12px;
  border-radius: 4px; font-family: sans-serif; font-weight: bold;
  display: flex; align-items: center; justify-content: center;
  transition: background 0.2s; cursor: pointer;
}
.btn-google:hover { background: #f1f1f1; }