/* ============================================================
   QUEST TEMPLATE — design system
   フェルト×クリーム紙×ゴールドを基調にした、学習クエスト系サイトの
   見た目だけを抜き出した共通デザインシステム。
   クイズ判定・進捗管理・ダイアログ内容などのロジックは含まない。
   色を変えたいときは :root の変数だけ差し替えればOK。
   ============================================================ */

*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{-webkit-text-size-adjust:100%;text-size-adjust:100%;scroll-behavior:smooth}
html,body{max-width:100vw;overflow-x:hidden}

:root{
  /* ベース配色（宇宙・時空カラー：紺×紫×ゴールドの星）。差し替えればテーマが丸ごと変わる */
  --bg1:#241a5e;--bg2:#3a2a82;--bg3:#0a0620;
  --paper:#f6f1e2;--paper2:#fffdf6;--ink:#241d12;--muted:#8a7a5c;--line:#ddd0ad;
  --gold:#d9a441;--gold-dark:#a6742a;--gold-light:#f3d99a;
  --felt:#3d2a8c;--felt-dark:#170f42;
  --ok:#2f9e5c;--ok-bg:#e6f5ec;--ok-bd:#8fd1ab;
  --ng:#c8433f;--ng-bg:#fbe9e8;--ng-bd:#e79a97;
  --shadow:0 16px 40px rgba(0,0,0,.35);
  --r:10px;--r-lg:16px;
  --f:system-ui,-apple-system,"Hiragino Sans","Yu Gothic",sans-serif;
}

body{
  font-family:var(--f);color:var(--ink);font-weight:600;min-height:100vh;line-height:1.7;
  background:radial-gradient(circle at 20% 0%,var(--bg2) 0,var(--bg1) 40%,var(--bg3) 100%);
}
a{color:inherit}
button,a{-webkit-tap-highlight-color:transparent}

/* ==========================================================
   1. ページ共通シェル（内側ページ：ヘッダー＋サイドバー＋メイン）
   ========================================================== */
.app-shell{min-height:100vh;display:flex;flex-direction:column;gap:12px;padding:10px 12px 24px}

/* ヘッダー */
.game-header{display:flex;align-items:center;gap:18px;flex-wrap:wrap;color:#fff;padding:10px 16px;
  background:linear-gradient(180deg,rgba(255,255,255,.06),rgba(0,0,0,.14));border-radius:12px;border:1px solid rgba(255,255,255,.15)}
.brand{display:flex;flex-direction:column;gap:2px;min-width:220px}
/* brand-title の中にホームバッジ(アイコン)を入れると、それ自体がトップへ戻るボタンになる */
.brand-title{display:flex;align-items:center;gap:9px;font-size:22px;font-weight:950;letter-spacing:.02em;color:var(--gold);text-shadow:0 2px 0 rgba(0,0,0,.4)}
.brand-sub{font-size:12.5px;font-weight:800;color:#d9ece7}
.head-progress-wrap{flex:1;min-width:160px;display:flex;flex-direction:column;gap:4px}
.head-progress-label{font-size:11.5px;color:#cfe4de;font-weight:800}
.head-progress{height:14px;background:rgba(255,255,255,.18);border-radius:999px;overflow:hidden;box-shadow:inset 0 2px 4px rgba(0,0,0,.3)}
.head-progress-fill{height:100%;width:0;background:linear-gradient(90deg,#f3c47a,var(--gold-dark));border-radius:999px;transition:width .4s}
.head-reset{padding:9px 14px;border:1.5px solid rgba(255,255,255,.55);border-radius:8px;background:rgba(0,0,0,.2);color:#fff;font-size:12.5px;font-weight:800;cursor:pointer;white-space:nowrap}
.head-reset:hover{background:rgba(255,255,255,.12)}
a.head-reset{text-decoration:none;display:inline-flex;align-items:center}
/* 円形バッジ（ブランドアイコン兼トップへ戻るボタン） */
.head-reset.home-badge{width:38px;height:38px;padding:0;border-radius:50%;justify-content:center;background:radial-gradient(circle at 35% 30%, rgba(217,164,65,.5), rgba(10,40,38,1) 75%);border:1.5px solid var(--gold);box-shadow:0 0 0 3px rgba(0,0,0,.25),0 0 10px -2px var(--gold);font-size:18px}
.head-reset.home-badge:hover{box-shadow:0 0 0 3px rgba(0,0,0,.25),0 0 16px 0 var(--gold);background:rgba(0,0,0,.12);transform:translateY(-2px) scale(1.07)}
.header-actions{display:flex;align-items:center;gap:10px;margin-left:auto;flex-shrink:0}

/* レイアウト（サイドバー折りたたみ対応のオフキャンバス方式） */
.game-layout{display:grid;grid-template-columns:230px minmax(0,1fr);gap:14px;align-items:start;transition:grid-template-columns .25s ease}
.side-backdrop{display:none}

/* サイドバー */
.side-panel{background:linear-gradient(180deg,rgba(17,107,70,.92),rgba(5,32,21,.95));border:1px solid rgba(255,255,255,.16);
  border-radius:12px;box-shadow:var(--shadow);overflow:hidden;position:sticky;top:10px;transition:width .25s ease}
.side-head{padding:12px 14px;font-size:13px;font-weight:900;color:#eaf6f2;border-bottom:1px solid rgba(255,255,255,.14);
  display:flex;align-items:center;gap:8px;min-height:20px}
.side-head-text{white-space:nowrap}
.side-toggle{width:32px;height:28px;border:1px solid rgba(255,255,255,.28);border-radius:7px;background:rgba(255,255,255,.10);
  color:#eaf6f2;font-weight:950;font-size:16px;cursor:pointer;line-height:1;flex-shrink:0}
.side-list{display:flex;flex-direction:column}
.side-item{display:flex;align-items:center;gap:10px;padding:11px 14px;border-bottom:1px solid rgba(255,255,255,.09);
  color:#c8ded7;cursor:pointer;user-select:none;touch-action:manipulation;min-width:0}
.side-item:hover{background:rgba(255,255,255,.06)}
.side-item.active{background:rgba(217,164,65,.2);box-shadow:inset 3px 0 0 var(--gold)}
.side-item.locked{opacity:.45;cursor:not-allowed}
.side-icon{font-size:16px;width:20px;text-align:center;flex-shrink:0}
.side-text{min-width:0}
.side-main{font-size:12.5px;font-weight:900;line-height:1.3;color:#fff;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.side-sub{font-size:10.5px;color:#a9c7be;margin-top:1px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}

.app-shell.side-collapsed .game-layout{grid-template-columns:64px minmax(0,1fr)}
.app-shell.side-collapsed .side-panel{width:64px}
.app-shell.side-collapsed .side-head{justify-content:center;padding:8px 6px}
.app-shell.side-collapsed .side-head-text{display:none}
.app-shell.side-collapsed .side-item{justify-content:center;padding:11px 6px}
.app-shell.side-collapsed .side-item .side-text{display:none}

@media(min-width:901px){
  .app-shell.side-collapsed .game-layout{grid-template-columns:230px minmax(0,1fr) !important}
  .app-shell.side-collapsed .side-panel{width:auto !important}
  .app-shell.side-collapsed .side-head{justify-content:space-between !important;padding:12px 14px !important}
  .app-shell.side-collapsed .side-head-text{display:block !important}
  .app-shell.side-collapsed .side-item{justify-content:flex-start !important;padding:11px 14px !important}
  .app-shell.side-collapsed .side-item .side-text{display:block !important}
}
@media(max-width:900px){
  .game-layout{grid-template-columns:64px minmax(0,1fr);gap:8px}
  .app-shell:not(.side-collapsed) .game-layout{grid-template-columns:210px minmax(0,1fr)}
  .side-panel{position:sticky;top:8px}
}
@media(max-width:700px){
  .game-layout{grid-template-columns:1fr}
  .app-shell.side-collapsed .game-layout,
  .app-shell:not(.side-collapsed) .game-layout{grid-template-columns:1fr}
  .side-panel{position:fixed;top:0;left:0;width:min(82vw,300px);height:100vh;height:100dvh;
    border-radius:0;transform:translateX(-100%);transition:transform .25s ease;
    box-shadow:10px 0 30px rgba(0,0,0,.45);overflow-y:auto;z-index:80}
  .app-shell.side-collapsed .side-panel{transform:translateX(-100%)}
  .app-shell:not(.side-collapsed) .side-panel{transform:translateX(0)}
  .side-backdrop{display:none;position:fixed;inset:0;background:rgba(6,12,18,.55);z-index:70}
  .app-shell:not(.side-collapsed) .side-backdrop{display:block}
  .game-header{padding:8px 12px}
}

/* メインエリア */
.main-area{background:var(--paper);border:1px solid #e3d8bd;border-radius:12px;padding:18px 18px 20px;box-shadow:var(--shadow);min-height:520px}
.chapter-head{margin-bottom:12px}
.chapter-badge{display:inline-block;background:linear-gradient(#e8c07f,var(--gold-dark));color:#3a2705;border-radius:7px;
  padding:4px 11px;font-size:12px;font-weight:950;letter-spacing:.02em;margin-right:8px;box-shadow:0 2px 0 rgba(0,0,0,.15)}
.chapter-title{display:inline;font-size:20px;font-weight:950;color:#1c2f2b}
.chapter-sub{font-size:13px;color:var(--muted);margin-top:4px;font-weight:700}

/* ==========================================================
   2. キャラクター対話（吹き出し）
   .dialog-avatar.mentor / .dialog-avatar.student で色分け。
   画像を使う場合は中に <img> を入れる（object-fit:contain）。
   ========================================================== */
.dialogue-scene{display:flex;flex-direction:column;gap:8px;margin:14px 0 16px}
.dialog-row{display:grid;grid-template-columns:88px minmax(0,1fr);gap:12px;align-items:stretch;border:1px solid var(--line);background:var(--paper2);border-radius:10px;padding:10px 12px;box-shadow:0 2px 0 rgba(0,0,0,.04)}
.dialog-row.right{grid-template-columns:minmax(0,1fr) 88px}
.dialog-row.right .dialog-character{order:2}
.dialog-row.right .dialog-bubble{order:1}
.dialog-character{display:flex;flex-direction:column;align-items:center;justify-content:center;gap:0;min-width:0}
.dialog-avatar{position:relative;z-index:1;width:75px;height:96px;border-radius:10px;display:flex;align-items:center;justify-content:center;font-size:34px;box-shadow:0 3px 6px rgba(0,0,0,.18);flex-shrink:0;overflow:hidden}
.dialog-avatar.mentor{background:linear-gradient(#fde3d6,#f7c2a4)}
.dialog-avatar.student{background:linear-gradient(#dcefe9,#b9dcd0)}
.dialog-avatar img{width:100%;height:100%;object-fit:contain}
.dialog-name{position:relative;z-index:2;margin-top:-8px;padding:3px 10px;border-radius:7px;color:#fff;font-weight:900;font-size:11px;line-height:1.2;box-shadow:0 2px 0 rgba(0,0,0,.16);white-space:nowrap;text-align:center}
.dialog-name.mentor{background:linear-gradient(#f0b868,#c19a3a)}
.dialog-name.student{background:linear-gradient(#5cc2ab,#2f8f78)}
.dialog-bubble{position:relative;align-self:center;background:var(--paper);border:1px solid var(--line);border-radius:12px;padding:11px 14px;color:var(--ink);font-size:14.5px;line-height:1.75;font-weight:700;min-height:56px;display:flex;flex-direction:column;justify-content:center}
.dialog-bubble::before{content:"";position:absolute;left:-10px;top:50%;transform:translateY(-50%);width:0;height:0;border-top:8px solid transparent;border-bottom:8px solid transparent;border-right:10px solid var(--line)}
.dialog-bubble::after{content:"";position:absolute;left:-8px;top:50%;transform:translateY(-50%);width:0;height:0;border-top:7px solid transparent;border-bottom:7px solid transparent;border-right:9px solid var(--paper)}
.dialog-row.right .dialog-bubble::before{left:auto;right:-10px;border-right:0;border-left:10px solid var(--line)}
.dialog-row.right .dialog-bubble::after{left:auto;right:-8px;border-right:0;border-left:9px solid var(--paper)}
@media (max-width:700px){
  .dialog-row,.dialog-row.right{grid-template-columns:70px minmax(0,1fr);padding:8px;gap:8px}
  .dialog-row.right .dialog-character{order:0}
  .dialog-row.right .dialog-bubble{order:1}
  .dialog-avatar{width:59px;height:76px;font-size:27px}
  .dialog-name{font-size:9.5px;padding:3px 7px;margin-top:-6px}
  .dialog-bubble{font-size:14px;padding:9px 11px;min-height:0}
  .dialog-row.right .dialog-bubble::before{left:-10px;right:auto;border-left:0;border-right:10px solid var(--line)}
  .dialog-row.right .dialog-bubble::after{left:-8px;right:auto;border-left:0;border-right:9px solid var(--paper)}
}

/* ==========================================================
   3. ミッションボックス／ボタン／選択肢（クイズの見た目のみ。判定ロジックは含まない）
   ========================================================== */
.mission-box{background:linear-gradient(180deg,#fff8e6,#fdefc9);border:1px solid #e3c877;border-radius:10px;padding:12px 14px;margin-bottom:14px}
.mission-label{font-size:11.5px;font-weight:950;color:#8a6614;margin-bottom:3px}
.mission-text{font-size:13.5px;color:#3a2c08;font-weight:700;line-height:1.6}
.mission-status{display:inline-block;margin-top:8px;padding:3px 11px;border-radius:999px;font-size:11.5px;font-weight:900;
  background:#eee1bd;color:#8a6614}
.mission-status.ok{background:var(--ok-bg);color:var(--ok);border:1px solid var(--ok-bd)}

/* ステージクリア演出・クリアバッジ */
.stage-clear-banner{margin:18px 0 4px;text-align:center;font-size:24px;font-weight:950;color:var(--gold-dark);letter-spacing:.04em;animation:clear-pop .5s cubic-bezier(.2,1.6,.4,1)}
@keyframes clear-pop{0%{transform:scale(.3);opacity:0}100%{transform:scale(1);opacity:1}}
.quest-card.cleared::after{content:"🏅";position:absolute;top:-12px;right:-8px;font-size:26px;filter:drop-shadow(0 2px 3px rgba(0,0,0,.3))}
@media (prefers-reduced-motion:reduce){.stage-clear-banner{animation:none}}

.stage-nav{display:flex;justify-content:flex-end;gap:10px;margin-top:18px;flex-wrap:wrap}
.btn{border:1px solid #c9bda0;background:#fff;border-radius:8px;padding:.65rem 1.2rem;font-size:13.5px;cursor:pointer;
  color:var(--ink);font-family:var(--f);font-weight:800;touch-action:manipulation;-webkit-tap-highlight-color:transparent}
.btn:hover{background:#f4efe0}
.btn:disabled{opacity:.4;cursor:not-allowed}
a.btn{text-decoration:none;display:inline-flex;align-items:center}
.btn-primary{background:linear-gradient(#d9a441,#a6742a);border-color:#8f5518;color:#fff;box-shadow:0 3px 0 #6f430f}
.btn-primary:hover{opacity:.92;background:linear-gradient(#d9a441,#a6742a)}
.btn-primary:disabled{opacity:.4;cursor:not-allowed;box-shadow:none}

.choice-list{display:flex;flex-wrap:wrap;gap:8px;margin-top:10px}
.choice-btn{border:1.5px solid #b6c9c2;background:#fff;border-radius:8px;padding:.55rem 1rem;font-size:14px;font-weight:800;
  cursor:pointer;color:#20463d;touch-action:manipulation;text-align:left}
.choice-btn:hover{background:#eef7f3}
.choice-btn.choice-ok{background:var(--ok-bg);border-color:var(--ok-bd);color:var(--ok)}
.choice-btn.choice-ng{background:var(--ng-bg);border-color:var(--ng-bd);color:var(--ng)}
/* 色だけに頼らない正誤表示（色覚特性への配慮） */
.choice-btn.choice-ok::before{content:"✓ "}
.choice-btn.choice-ng::before{content:"✗ "}
/* スクリーンリーダー専用テキスト */
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0}
.quiz-q{font-size:14.5px;font-weight:850;color:#1c2f2b;margin-top:4px}
.quiz-head{font-size:14px;font-weight:950;color:#1c2f2b;margin:18px 0 10px;padding-top:10px;border-top:1px dashed var(--line)}
.quiz-card{background:linear-gradient(180deg,#fff,var(--paper2));border:1px solid var(--line);border-radius:10px;padding:12px 14px;margin-bottom:10px}
.quiz-explain{margin-top:9px;font-size:13.5px;line-height:1.6;color:#3a2c08;background:#fff8e6;border:1px solid #e3c877;border-radius:8px;padding:8px 10px}

/* ==========================================================
   4.5 SVG図解ボックス（relativity-quest 独自拡張）
   ========================================================== */
.diagram-box{background:var(--paper2);border:1px solid var(--line);border-radius:12px;padding:14px;margin:16px 0;text-align:center}
.diagram-box svg{max-width:min(100%,460px);height:auto}
.diagram-caption{font-size:12.5px;color:var(--muted);margin-top:8px;font-weight:700;line-height:1.6}
.formula-box{background:#fff8e6;border:1px solid #e3c877;border-radius:10px;padding:12px 16px;margin:12px 0;font-size:14px;line-height:2.1;color:#3a2c08;font-weight:700;overflow-x:auto}
.formula-box .step{display:block}

/* ==========================================================
   5. 終了画面／外部リンク案内
   ========================================================== */
#book-recommend{margin-top:14px;background:var(--paper2);border:1px solid var(--line);border-radius:10px;padding:10px 14px;box-shadow:0 2px 0 rgba(0,0,0,.04)}
#book-recommend:empty{display:none}
.book-recommend-label{display:inline-block;font-size:10px;font-weight:900;color:var(--muted);border:1px solid var(--muted);border-radius:4px;padding:0 4px;margin:0 0 6px}
.book-recommend-body{display:flex;align-items:center;gap:12px}
.book-recommend-lead{font-size:12px;color:var(--muted);margin:0 0 4px;font-weight:700}
#book-recommend a{font-size:13px;color:var(--gold-dark);font-weight:900;text-decoration:underline}
.book-recommend-note{margin-top:7px;font-size:10.5px;color:var(--muted);font-weight:700}

.recap-list{display:flex;flex-direction:column;gap:10px;margin:4px 0 8px}
.recap-item{display:flex;align-items:flex-start;gap:12px;padding:12px 14px;background:var(--paper2);border:1px solid var(--line);border-radius:10px}
.recap-num{flex-shrink:0;width:26px;height:26px;border-radius:50%;background:linear-gradient(#d9a441,#a6742a);color:#fff;font-weight:900;font-size:12px;display:flex;align-items:center;justify-content:center;margin-top:1px}
.recap-body{font-size:13px;line-height:1.7}
.recap-title{font-weight:900;color:var(--ink)}
.recap-desc{color:var(--muted);font-weight:700}
.complete-actions{display:flex;gap:12px;flex-wrap:wrap;justify-content:center;margin-top:20px}

/* ==========================================================
   6. トップ（ポータル）ページ：ヒーロー＋クエストカード
   ========================================================== */
.shell{width:min(1080px,calc(100% - 32px));margin:0 auto;padding:10px 0 28px}

.topbar{display:flex;align-items:center;gap:14px;flex-wrap:wrap;color:#fff;padding:12px 18px;margin-bottom:16px;
  background:linear-gradient(180deg,rgba(255,255,255,.06),rgba(0,0,0,.14));border-radius:14px;border:1px solid rgba(255,255,255,.15)}
.brand-badge{width:44px;height:44px;flex-shrink:0;border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:22px;
  background:radial-gradient(circle at 35% 30%,rgba(217,164,65,.55),rgba(10,40,38,1) 75%);border:1.5px solid var(--gold);
  box-shadow:0 0 0 3px rgba(0,0,0,.25),0 0 10px -2px var(--gold)}
.brand-copy{display:flex;flex-direction:column;line-height:1.25}
.brand-copy strong{font-size:18px;font-weight:900;letter-spacing:.02em;color:var(--gold-light)}
.brand-copy small{margin-top:2px;font-size:10.5px;font-weight:800;letter-spacing:.08em;color:#cfe4de}

.hero{position:relative;display:flex;align-items:flex-end;justify-content:center;gap:18px;padding:14px 10px 10px;text-align:center}
.hero-mascot{width:104px;height:auto;flex-shrink:0;filter:drop-shadow(0 10px 14px rgba(0,0,0,.35))}
.hero-copy{max-width:560px}
.hero h1{color:#fffdf7;font-size:clamp(22px,4.6vw,34px);font-weight:900;line-height:1.5;letter-spacing:.01em;
  text-shadow:0 4px 16px rgba(0,0,0,.3)}
.hero h1 .line{display:block}
.hero h1 .accent{color:var(--gold-light)}
.hero p{max-width:440px;margin:12px auto 0;color:#e2efe9;font-size:13.5px;font-weight:700;line-height:2}
.nowrap{white-space:nowrap}

.board{margin-top:20px;padding:20px 20px 24px;background:var(--paper);border:1px solid #e3d8bd;border-radius:22px;box-shadow:var(--shadow)}
.board-head{display:flex;align-items:flex-end;justify-content:space-between;gap:16px;flex-wrap:wrap;margin-bottom:16px;
  padding-bottom:14px;border-bottom:2.5px dashed var(--line)}
.board-head h2{font-size:22px;font-weight:900;color:var(--ink)}
.board-head p{font-size:12px;font-weight:700;color:var(--muted)}

.quest-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px}
.quest-card{
  --accent:var(--gold-dark);--accent-bg:#fdf6e6;
  position:relative;display:flex;flex-direction:column;gap:10px;padding:18px 18px 16px;
  border-radius:var(--r-lg);border:3px solid var(--accent);background:var(--accent-bg);
  color:var(--ink);text-decoration:none;box-shadow:0 6px 0 var(--accent);
  transition:transform .16s ease,box-shadow .16s ease;
}
.quest-card:hover,.quest-card:focus-visible{transform:translateY(-3px);box-shadow:0 9px 0 var(--accent);outline:none}
.quest-card:active{transform:translateY(3px);box-shadow:0 2px 0 var(--accent)}
.quest-card.locked{opacity:.6;cursor:default;box-shadow:0 6px 0 var(--accent)}
.quest-card.locked:hover{transform:none;box-shadow:0 6px 0 var(--accent)}

.q-top{display:flex;align-items:center;gap:10px}
.q-num{width:34px;height:34px;flex-shrink:0;border-radius:50%;display:flex;align-items:center;justify-content:center;
  background:var(--accent);color:#fff;font-weight:900;font-size:14px;box-shadow:0 2px 0 rgba(0,0,0,.18)}
.q-suit{margin-left:auto;font-size:24px;color:var(--accent)}
.q-title{font-size:19px;font-weight:900;line-height:1.3}
.q-meta{display:flex;align-items:center;gap:8px;flex-wrap:wrap}
.q-tag{display:inline-block;width:fit-content;padding:3px 10px;border-radius:999px;background:var(--accent);color:#fff;
  font-size:10px;font-weight:900;letter-spacing:.04em}
.q-time{font-size:10.5px;font-weight:800;color:#5a5142}
.q-desc{font-size:12px;font-weight:700;color:#5a5142;line-height:1.7;flex:1}
.q-cta{margin-top:4px;display:inline-flex;align-items:center;justify-content:center;gap:6px;padding:10px 0;border-radius:999px;
  background:var(--accent);color:#fff;font-size:13px;font-weight:900;box-shadow:0 3px 0 rgba(0,0,0,.2)}

footer{margin-top:20px;display:flex;flex-wrap:wrap;align-items:center;justify-content:center;gap:10px;
  color:#dcebe5;font-size:11px;font-weight:700;text-align:center}
.footer-suits{display:flex;gap:8px;font-size:15px;color:#e6d7ae}

@media (max-width:780px){
  .hero-mascot{display:none}
  .hero h1{font-size:clamp(17px,5.6vw,32px)}
}
@media (max-width:760px){
  .quest-grid{grid-template-columns:1fr}
  .hero{gap:8px;padding-top:10px}
  .board{padding:16px 14px 18px;border-radius:18px}
}
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{transition-duration:.01ms!important}
}