/* ============================================================
   さえちゃんの算数ドリル — game.css
   「ゆみちゃんのPython入門」（game/python/game.css）を土台にした改変版。
   接頭辞 pyd- を saed- に、配色を紫ベースから緑ベース（さえちゃんの髪色。
   「答える」ボタンだけ橙）に差し替えている。TARGETパネルは無く、本体は
   1カラム（さえちゃんのミッションパネル → 入力エリア → 結果エリア）。
   レイアウト・余白・フォント・アニメーションの骨格は Python入門から
   変えていない。
   サイト共通ヘッダー/フッター（partials/header.php, footer.php）を
   使用しつつ、the-backspace.css と同じ手法（body クラス + 高詳細度
   セレクタ）でダーク配色に上書きする（partials/ 側は変更しない）。
   ============================================================ */

:root {
  --saed-bg-deep:     #03080a;
  --saed-bg:          #061210;
  --saed-bg-panel:    #0b1f1a;
  --saed-bg-panel2:   #0f2a22;
  --saed-border:      #1c4a3b;
  --saed-border-soft: #143529;
  --saed-accent:      #4ade80;                 /* 旧 紫。見出し・枠・フォーカス。さえちゃんの髪色 */
  --saed-accent-soft: #bbf7d0;
  --saed-accent-glow: rgba(74, 222, 128, 0.35);
  --saed-run:         #fb923c;                 /* 「答える」ボタン。橙 */
  --saed-run-soft:    #fed7aa;
  --saed-ok:          #fbbf24;                 /* OK スタンプ。金 */
  --saed-ok-soft:     #fde68a;
  --saed-danger:      #fb4570;
  --saed-text:        #ecfdf5;
  --saed-text-dim:    #8fc4ad;
  --saed-text-faint:  #4f7d69;
  --saed-mono: "JetBrains Mono", "Consolas", monospace;
  --saed-sans: "Noto Sans JP", sans-serif;
}

/* ============================================================
   ベース
   ============================================================ */
body.saed-body {
  position: relative;
  margin: 0;
  min-height: 100vh;
  background:
    radial-gradient(ellipse 70% 50% at 50% 0%, rgba(74, 222, 128, 0.08), transparent 60%),
    linear-gradient(180deg, var(--saed-bg-deep) 0%, var(--saed-bg) 40%, var(--saed-bg-deep) 100%);
  color: var(--saed-text);
  font-family: var(--saed-sans);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  display: flex;
  flex-direction: column;
  isolation: isolate;
  color-scheme: dark;
}
body.saed-body, body.saed-body * {
  color-scheme: dark;
  box-sizing: border-box;
  font-variant-ligatures: none;
  font-feature-settings: "liga" 0, "calt" 0;
}
/* [hidden] 属性は flex/grid を指定したクラスと同じ詳細度になり負けることがあるため、
   常に display:none を勝たせる（HUDタイマー・結果統計などの動的な出し分けに使用） */
body.saed-body [hidden] { display: none !important; }

/* うっすらグリッド線背景 */
body.saed-body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -1;
  background-image:
    linear-gradient(rgba(74, 222, 128, 0.055) 1px, transparent 1px),
    linear-gradient(90deg, rgba(74, 222, 128, 0.055) 1px, transparent 1px);
  background-size: 42px 42px;
  background-position: center top;
  pointer-events: none;
}

body.saed-body .saed-main { flex: 1 0 auto; }
body.saed-body .site-header { flex: none; }
body.saed-body .site-footer { flex: none; margin-top: auto; }

/* ============================================================
   サイト共通ヘッダー/フッターのダーク上書き（the-backspace.css方式）
   ============================================================ */
body.saed-body .site-header,
body.saed-body .site-footer {
  font-family: var(--saed-sans);
}
body.saed-body .site-header {
  background: rgba(3, 8, 10, 0.95);
  border-bottom: 1px solid var(--saed-border);
}
body.saed-body .site-catch { color: var(--saed-text-dim); }
body.saed-body .site-catch strong { color: var(--saed-accent-soft); }
body.saed-body .brand-fallback { background: var(--saed-accent); color: var(--saed-bg-deep); }
body.saed-body .btn-h { border-color: var(--saed-border); }
body.saed-body .btn-h.ghost { color: var(--saed-text); background: transparent; }
body.saed-body .btn-h.ghost:hover { border-color: var(--saed-accent); color: var(--saed-accent-soft); }
body.saed-body .btn-h.solid { background: var(--saed-accent); border-color: var(--saed-accent); color: var(--saed-bg-deep); }
body.saed-body .btn-h.solid:hover { background: var(--saed-accent-soft); border-color: var(--saed-accent-soft); }
body.saed-body .site-footer { background: rgba(3, 8, 10, 0.95); border-top: 1px solid var(--saed-border); }
body.saed-body .footer-inner { color: var(--saed-text-faint); }
body.saed-body .footer-copy { color: var(--saed-text-faint); }
body.saed-body .footer-links a { color: var(--saed-text-dim); }
body.saed-body .footer-links a:hover { color: var(--saed-accent-soft); }

/* ============================================================
   アプリ全体
   ============================================================ */
.saed-main {
  padding: 1.5rem 1.25rem 3rem;
  display: flex;
  justify-content: center;
}
.saed-app {
  width: 100%;
  max-width: 780px;
  margin: 0 auto;
  font-family: var(--saed-sans);
}

.saed-screen { display: none; }
.saed-screen.active { display: block; animation: saed-fade-in 0.4s ease-out; }

@keyframes saed-fade-in {
  from { opacity: 0; transform: translateY(6px); }
  to { opacity: 1; transform: translateY(0); }
}

/* パネル共通（HUD/ターミナル風・角のブラケット装飾） */
.saed-panel {
  position: relative;
  background: linear-gradient(180deg, rgba(15, 42, 34, 0.85), rgba(6, 18, 16, 0.9));
  border: 1px solid var(--saed-border);
  border-radius: 6px;
  padding: 1.1rem 1.25rem;
  box-shadow: 0 0 0 1px rgba(74, 222, 128, 0.05) inset, 0 10px 28px rgba(0, 0, 0, 0.35);
}
.saed-panel::before,
.saed-panel::after {
  content: "";
  position: absolute;
  width: 14px;
  height: 14px;
  pointer-events: none;
}
.saed-panel::before {
  top: -1px; left: -1px;
  border-top: 2px solid var(--saed-accent);
  border-left: 2px solid var(--saed-accent);
}
.saed-panel::after {
  bottom: -1px; right: -1px;
  border-bottom: 2px solid var(--saed-ok);
  border-right: 2px solid var(--saed-ok);
}
.saed-panel-label {
  font-family: var(--saed-mono);
  font-size: 0.68rem;
  letter-spacing: 0.25em;
  color: var(--saed-accent-soft);
  margin-bottom: 0.6rem;
  opacity: 0.85;
}

/* ボタン共通 */
.saed-btn {
  font-family: var(--saed-mono);
  font-size: 0.85rem;
  letter-spacing: 0.04em;
  padding: 0.65rem 1.3rem;
  border-radius: 4px;
  border: 1px solid var(--saed-border);
  background: var(--saed-bg-panel);
  color: var(--saed-text);
  cursor: pointer;
  transition: border-color 0.2s ease, color 0.2s ease, background 0.2s ease, transform 0.15s ease, box-shadow 0.2s ease;
}
.saed-btn:hover, .saed-btn:focus-visible {
  border-color: var(--saed-accent);
  color: var(--saed-accent-soft);
  transform: translateY(-1px);
}
.saed-btn:disabled {
  opacity: 0.4;
  cursor: default;
  transform: none;
}
.saed-btn-primary {
  background: linear-gradient(180deg, var(--saed-accent), #16a34a);
  border-color: var(--saed-accent);
  color: var(--saed-bg-deep);
  font-weight: 700;
}
.saed-btn-primary:hover, .saed-btn-primary:focus-visible {
  color: var(--saed-bg-deep);
  box-shadow: 0 0 18px var(--saed-accent-glow);
}
.saed-btn-run {
  background: linear-gradient(180deg, var(--saed-run), #c2600f);
  border-color: var(--saed-run);
  color: var(--saed-bg-deep);
  font-weight: 700;
}
.saed-btn-run:hover, .saed-btn-run:focus-visible {
  color: var(--saed-bg-deep);
  box-shadow: 0 0 18px rgba(251, 146, 60, 0.4);
}
.saed-btn-ghost { background: transparent; }
.saed-btn-ghost.is-active {
  border-color: var(--saed-accent);
  color: var(--saed-accent-soft);
  box-shadow: 0 0 14px var(--saed-accent-glow);
}
.saed-btn-small { font-size: 0.72rem; padding: 0.4rem 0.9rem; }
/* 「終了する」: 戻る系より一段おとなしく。押すと退場フェードでトップへ */
.saed-btn-exit { color: var(--saed-text-faint); border-color: transparent; }
.saed-btn-exit:hover, .saed-btn-exit:focus-visible, .saed-btn-exit.is-kbfocus { color: var(--saed-text); }

/* 二択ボタン */
.saed-btn-choice {
  font-size: 1.05rem;
  padding: 1rem 1.2rem;
  flex: 1;
  min-width: 140px;
}
.saed-btn-choice.is-picked {
  border-color: var(--saed-accent);
  color: var(--saed-accent-soft);
  box-shadow: 0 0 14px var(--saed-accent-glow);
}

/* ============================================================
   表紙
   ============================================================ */
.saed-title-wrap {
  position: relative;
  z-index: 1;
  width: 100%;
  max-width: 980px;
  margin: 0 auto;
  text-align: center;
  padding: 2.5rem 0 3rem;
}
/* 表紙は1画面ぶんの舞台にして、背景シーンを重ねる */
#screen-title {
  position: relative;
  overflow: hidden;
  min-height: min(74vh, 720px);
  border-radius: 10px;
}
#screen-title.saed-screen.active {
  display: flex;
  align-items: center;
  justify-content: center;
}
.saed-sae-figure {
  width: 120px;
  margin: 0 auto 0.75rem;
}
.saed-sae-figure img {
  width: 100%;
  display: block;
  filter: drop-shadow(0 0 18px rgba(74, 222, 128, 0.35));
}
.saed-title-logo {
  font-family: var(--saed-mono);
  font-size: 2.6rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  margin: 0.25rem 0 0.4rem;
  color: var(--saed-text);
  text-shadow: 0 0 18px var(--saed-accent-glow), 0 0 42px rgba(74, 222, 128, 0.18);
  background: linear-gradient(90deg, var(--saed-accent-soft), var(--saed-ok-soft));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  animation: saed-title-glow 3.2s ease-in-out infinite;
}
@keyframes saed-title-glow {
  0%, 100% { filter: brightness(1); }
  50% { filter: brightness(1.25); }
}
.saed-subtitle {
  color: var(--saed-text-dim);
  font-size: 0.95rem;
  letter-spacing: 0.04em;
  margin: 0 0 2.25rem;
}
.saed-btn-start {
  font-size: 1.05rem;
  padding: 0.9rem 2.4rem;
  margin-bottom: 0.6rem;
}
.saed-press-enter {
  font-family: var(--saed-mono);
  font-size: 0.68rem;
  letter-spacing: 0.3em;
  color: var(--saed-text-faint);
  margin: 0 0 1.6rem;
  animation: saed-blink 1.6s steps(1, end) infinite;
}
@keyframes saed-blink {
  0%, 49% { opacity: 1; }
  50%, 100% { opacity: 0.15; }
}
.saed-title-actions {
  display: flex;
  justify-content: center;
  gap: 0.6rem;
  flex-wrap: wrap;
}

/* 「終了する」の退場フェード（The BackSpace の退店・眺めるアプリの「もどる」と同じく、
   黒へ沈んでからトップページへ戻る） */
body.saed-leaving {
  opacity: 0;
  transition: opacity 1.4s ease;
  pointer-events: none;
}

/* ============================================================
   モード選択・単元選択・オプション（共通の見出し/戻るボタン）
   ============================================================ */
.saed-sub-wrap {
  max-width: 980px;
  margin: 0 auto;
  padding: 1.5rem 0 2rem;
  text-align: center;
}
.saed-section-heading {
  font-family: var(--saed-mono);
  font-size: 1.05rem;
  letter-spacing: 0.08em;
  color: var(--saed-accent-soft);
  margin: 0 0 1.4rem;
  text-align: center;
}
.saed-sub-buttons {
  display: flex;
  justify-content: center;
  gap: 0.75rem;
  flex-wrap: wrap;
  margin-top: 1.75rem;
}

/* モード選択カード */
.saed-mode-grid {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  max-width: 520px;
  margin: 0 auto;
}
.saed-mode-card {
  position: relative;
  background: linear-gradient(180deg, rgba(15, 42, 34, 0.85), rgba(6, 18, 16, 0.9));
  border: 1px solid var(--saed-border);
  border-radius: 8px;
  padding: 1.3rem 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  cursor: pointer;
  color: var(--saed-text);
  font-family: var(--saed-sans);
  text-align: left;
  transition: border-color 0.2s ease, transform 0.15s ease, box-shadow 0.2s ease;
}
.saed-mode-card:hover, .saed-mode-card:focus-visible {
  border-color: var(--saed-accent);
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(74, 222, 128, 0.15);
}
.saed-mode-card-title {
  font-weight: 700;
  font-size: 1.2rem;
  color: var(--saed-accent-soft);
}
.saed-mode-card-sub {
  font-size: 0.85rem;
  color: var(--saed-text-dim);
  line-height: 1.5;
}

/* 単元選択カード */
.saed-level-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
  margin: 0 0 1rem;
  text-align: left;
}
.saed-level-card {
  position: relative;
  background: linear-gradient(180deg, rgba(15, 42, 34, 0.85), rgba(6, 18, 16, 0.9));
  border: 1px solid var(--saed-border);
  border-radius: 6px;
  padding: 1rem 1.1rem;
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  cursor: pointer;
  color: var(--saed-text);
  font-family: var(--saed-sans);
  text-align: left;
  transition: border-color 0.2s ease, transform 0.15s ease, box-shadow 0.2s ease;
}
.saed-level-card:hover, .saed-level-card:focus-visible {
  border-color: var(--saed-accent);
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(74, 222, 128, 0.12);
}
.saed-level-card.is-cleared { border-color: var(--saed-ok); }
.saed-level-card-badge {
  font-family: var(--saed-mono);
  font-size: 0.65rem;
  letter-spacing: 0.15em;
  color: var(--saed-accent-soft);
}
.saed-level-card.is-cleared .saed-level-card-badge { color: var(--saed-ok-soft); }
.saed-level-card-title {
  font-weight: 700;
  font-size: 1.02rem;
}
.saed-level-card-sub {
  font-size: 0.8rem;
  color: var(--saed-text-dim);
  line-height: 1.5;
}
.saed-level-card-best {
  font-family: var(--saed-mono);
  font-size: 0.72rem;
  color: var(--saed-ok-soft);
}

/* オプション画面 */
.saed-options-panel {
  max-width: 560px;
  margin: 1.5rem auto 0;
  padding: 1.5rem 1.5rem 1.75rem;
}
.saed-option-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.25rem;
  padding: 0.9rem 0;
  border-bottom: 1px solid var(--saed-border-soft);
}
.saed-option-row:last-of-type { border-bottom: none; }
.saed-option-info { flex: 1; min-width: 0; }
.saed-option-title {
  display: block;
  font-weight: 700;
  font-size: 0.95rem;
  margin-bottom: 0.25rem;
}
.saed-option-desc {
  margin: 0;
  font-size: 0.78rem;
  color: var(--saed-text-dim);
  line-height: 1.6;
}
.saed-option-toggle { white-space: nowrap; flex: none; }

/* ============================================================
   プレイ画面: HUD
   ============================================================ */
.saed-hud {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  padding: 0.75rem 1.1rem;
  margin-bottom: 1.1rem;
  background: rgba(6, 18, 16, 0.85);
  border: 1px solid var(--saed-border);
  border-radius: 6px;
  font-family: var(--saed-mono);
  flex-wrap: wrap;
}
.saed-hud-item {
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
}
.saed-hud-label {
  font-size: 0.62rem;
  letter-spacing: 0.15em;
  color: var(--saed-text-faint);
}
.saed-hud-value {
  font-size: 1.02rem;
  font-weight: 700;
  color: var(--saed-accent-soft);
  white-space: nowrap;
}
.saed-hud-assist-badge {
  font-size: 0.72rem;
  color: var(--saed-accent-soft);
  letter-spacing: 0.04em;
  opacity: 0.85;
  white-space: nowrap;
  flex: 1;
  text-align: right;
}
.saed-hud-quit {
  font-family: var(--saed-mono);
  font-size: 0.72rem;
  color: var(--saed-text-faint);
  background: transparent;
  border: 1px solid var(--saed-border);
  border-radius: 4px;
  padding: 0.4rem 0.75rem;
  cursor: pointer;
  transition: border-color 0.2s ease, color 0.2s ease;
}
.saed-hud-quit:hover { border-color: var(--saed-danger); color: var(--saed-danger); }

/* ============================================================
   プレイ画面: レイアウト（1カラム: さえちゃんパネル→入力→結果）
   ============================================================ */
.saed-play-body {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.saed-mission-prompt {
  font-size: 1.6rem;
  font-weight: 700;
  margin: 0 0 0.5rem;
  color: var(--saed-text);
  line-height: 1.6;
}
.saed-mission-hint {
  font-size: 0.9rem;
  color: var(--saed-ok-soft);
  margin: 0.2rem 0 0.4rem;
  line-height: 1.6;
}
.saed-mission-hint[hidden] { display: none; }
.saed-hint-btn { margin-top: 0.2rem; }
.saed-mission-panel { position: relative; }

.saed-sae-corner {
  display: flex;
  flex-direction: row;
  justify-content: flex-end;
  align-items: center;
  gap: 0.6rem;
  margin-top: 0.8rem;
}
.saed-sae-corner img {
  width: 3.6rem;
  flex: 0 0 auto;
  display: block;
  filter: drop-shadow(0 0 10px rgba(74, 222, 128, 0.3));
}
.saed-sae-bubble {
  position: static;
  max-width: 100%;
  white-space: normal;
  text-align: right;
  background: rgba(11, 31, 26, 0.95);
  border: 1px solid var(--saed-accent);
  color: var(--saed-accent-soft);
  font-size: 0.7rem;
  padding: 0.35rem 0.6rem;
  border-radius: 999px;
  opacity: 0;
}
.saed-sae-bubble.saed-bubble-pop {
  animation: saed-bubble-pop 2.4s ease-out forwards;
}
@keyframes saed-bubble-pop {
  0% { opacity: 0; transform: translateY(4px); }
  10% { opacity: 1; transform: translateY(0); }
  85% { opacity: 1; }
  100% { opacity: 0; }
}

/* ============================================================
   プレイ画面: 数値入力エリア
   ============================================================ */
.saed-input-number-area {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  background: rgba(4, 12, 10, 0.9);
  border: 1px solid var(--saed-accent);
  border-radius: 6px;
  padding: 1rem 1.1rem;
  box-shadow: 0 0 20px rgba(74, 222, 128, 0.08) inset;
}
.saed-number-input-row {
  display: flex;
  align-items: baseline;
  gap: 0.75rem;
  justify-content: center;
}
.saed-number-input {
  font-family: var(--saed-mono);
  font-size: 2.2rem;
  font-weight: 700;
  text-align: right;
  width: 100%;
  max-width: 320px;
  background: transparent;
  border: none;
  border-bottom: 2px solid var(--saed-border);
  outline: none;
  color: var(--saed-text);
  padding: 0.2rem 0.1rem;
}
.saed-number-input:focus { border-bottom-color: var(--saed-accent); }
.saed-number-input::placeholder { color: var(--saed-text-faint); }
.saed-answer-unit {
  font-family: var(--saed-mono);
  font-size: 1.3rem;
  color: var(--saed-accent-soft);
  white-space: nowrap;
}
.saed-input-actions {
  display: flex;
  justify-content: center;
  gap: 0.75rem;
  flex-wrap: wrap;
}

/* ============================================================
   プレイ画面: 二択（おかしさ検出）
   ============================================================ */
.saed-input-choice-area {
  display: flex;
  flex-direction: column;
  gap: 0.9rem;
  background: rgba(4, 12, 10, 0.9);
  border: 1px solid var(--saed-accent);
  border-radius: 6px;
  padding: 1rem 1.1rem;
  box-shadow: 0 0 20px rgba(74, 222, 128, 0.08) inset;
}
.saed-input-choice-area[hidden] { display: none; }
.saed-choice-pre {
  margin: 0;
  font-family: var(--saed-mono);
  font-size: 0.95rem;
  line-height: 1.7;
  color: var(--saed-text);
  white-space: pre-wrap;
  word-break: break-word;
  background: rgba(0, 0, 0, 0.2);
  border-radius: 4px;
  padding: 0.75rem 0.9rem;
}
.saed-choice-buttons {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
}

.saed-input-error {
  margin: -0.35rem 0 0;
  font-family: var(--saed-mono);
  font-size: 0.8rem;
  color: var(--saed-danger);
  text-align: center;
}
.saed-input-error[hidden] { display: none; }

/* ============================================================
   プレイ画面: 結果エリア
   ============================================================ */
.saed-result-area {
  display: none;
  position: relative;
  min-height: 4rem;
  padding: 1rem 1.1rem;
  background: rgba(4, 12, 10, 0.85);
  border: 1px solid var(--saed-border);
  border-radius: 6px;
}
.saed-result-area.show { display: block; }

.saed-result-offby {
  background: rgba(251, 69, 112, 0.18);
  border: 1px solid var(--saed-danger);
  color: var(--saed-danger);
  font-weight: 700;
  font-size: 1rem;
  text-align: center;
  border-radius: 4px;
  padding: 0.5rem 0.75rem;
  margin-bottom: 0.75rem;
}
.saed-result-offby[hidden] { display: none; }

.saed-result-lines { margin-bottom: 0.3rem; }
.saed-result-line {
  margin: 0.15rem 0;
  font-family: var(--saed-mono);
  font-size: 0.95rem;
  line-height: 1.7;
  color: var(--saed-text);
}
.saed-result-explain {
  margin: 0.5rem 0 0;
  font-size: 0.88rem;
  color: var(--saed-text-dim);
  line-height: 1.6;
}

.saed-result-stamp {
  position: absolute;
  top: 0.6rem;
  right: 0.8rem;
  font-family: var(--saed-mono);
  font-weight: 700;
  font-size: 1.1rem;
  letter-spacing: 0.1em;
  color: var(--saed-accent-soft);
  border: 2px solid var(--saed-accent);
  padding: 0.2rem 0.7rem;
  border-radius: 4px;
  transform: rotate(-6deg) scale(0);
  opacity: 0;
}
.saed-result-stamp.is-miss {
  color: var(--saed-danger);
  border-color: var(--saed-danger);
}
.saed-result-stamp.show {
  animation: saed-stamp-pop 0.5s cubic-bezier(0.34, 1.56, 0.64, 1) forwards;
}
@keyframes saed-stamp-pop {
  0% { transform: rotate(-6deg) scale(0); opacity: 0; }
  60% { transform: rotate(-6deg) scale(1.15); opacity: 1; }
  100% { transform: rotate(-6deg) scale(1); opacity: 1; }
}

.saed-result-next-wrap { display: none; margin-top: 0.9rem; text-align: center; }
.saed-result-next-wrap.show { display: block; }

/* 正解時: 画面全体が一瞬緑にフラッシュ */
body.saed-flash-correct::after {
  content: "";
  position: fixed;
  inset: 0;
  z-index: 999;
  background: rgba(74, 222, 128, 0.16);
  pointer-events: none;
  animation: saed-flash 0.4s ease-out forwards;
}
@keyframes saed-flash {
  from { opacity: 1; }
  to { opacity: 0; }
}

/* ミス時: 赤系グリッチでシェイク */
.saed-shake-miss {
  animation: saed-shake 0.4s ease-in-out;
  border-color: var(--saed-danger) !important;
}
@keyframes saed-shake {
  0%, 100% { transform: translateX(0); }
  20% { transform: translateX(-6px); }
  40% { transform: translateX(5px); }
  60% { transform: translateX(-4px); }
  80% { transform: translateX(3px); }
}

/* ============================================================
   結果画面
   ============================================================ */
.saed-result-panel {
  max-width: 480px;
  margin: 2rem auto 0;
  text-align: center;
  padding: 2rem 1.5rem;
}
.saed-result-panel .saed-sae-figure { width: 100px; }
#result-title {
  font-family: var(--saed-mono);
  font-size: 1.5rem;
  letter-spacing: 0.06em;
  color: var(--saed-accent-soft);
  margin: 0.5rem 0 0.4rem;
}
.saed-result-comment {
  color: var(--saed-text-dim);
  font-size: 0.9rem;
  margin: 0 0 1.5rem;
}
.saed-result-stats {
  display: flex;
  justify-content: center;
  gap: 1.5rem;
  flex-wrap: wrap;
  margin-bottom: 1rem;
}
.saed-result-stat {
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
}
.rs-label {
  font-size: 0.68rem;
  letter-spacing: 0.1em;
  color: var(--saed-text-faint);
  font-family: var(--saed-mono);
}
.rs-value {
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--saed-ok-soft);
  font-family: var(--saed-mono);
}
.saed-result-best {
  font-family: var(--saed-mono);
  font-size: 0.9rem;
  color: var(--saed-ok-soft);
  margin: 0 0 1.25rem;
}
.saed-result-best[hidden] { display: none; }
.saed-result-buttons {
  display: flex;
  justify-content: center;
  gap: 0.9rem;
  flex-wrap: wrap;
}

/* ============================================================
   レスポンシブ
   ============================================================ */
@media (max-width: 780px) {
  .saed-level-grid { grid-template-columns: repeat(2, 1fr); }
  .saed-sae-corner img { width: 2.8rem; }
}
@media (max-width: 520px) {
  .saed-title-logo { font-size: 1.9rem; }
  .saed-level-grid { grid-template-columns: 1fr; }
  .saed-hud { flex-wrap: wrap; gap: 0.75rem; }
  .saed-hud-assist-badge { text-align: left; width: 100%; order: 10; }
  .saed-option-row { flex-wrap: wrap; }
  .saed-number-input { font-size: 1.7rem; }
  .saed-mission-prompt { font-size: 1.3rem; }
}

@media (prefers-reduced-motion: reduce) {
  .saed-screen.active,
  .saed-result-stamp.show,
  body.saed-flash-correct::after,
  .saed-shake-miss,
  .saed-sae-bubble.saed-bubble-pop,
  .saed-title-logo,
  .saed-press-enter,
  .saed-scene-stars,
  .saed-scene-floor,
  .saed-scene-ring,
  .saed-scene-ring::before,
  .saed-scene-horizon {
    animation: none;
    opacity: 1;
  }
  body.saed-leaving { transition: none; }
}

/* ============================================================
   キーボード操作（矢印で選択・Enter で決定・Esc で戻る）
   ============================================================ */
.saed-mode-card.is-kbfocus,
.saed-level-card.is-kbfocus {
  border-color: var(--saed-accent);
  transform: translateY(-2px);
  box-shadow: 0 0 0 2px var(--saed-accent-glow), 0 8px 24px rgba(74, 222, 128, 0.15);
  outline: none;
}
.saed-btn.is-kbfocus {
  outline: none;
  box-shadow: 0 0 0 2px var(--saed-accent), 0 0 14px var(--saed-accent-glow);
}
.saed-kb-hint {
  margin: 1rem 0 0;
  text-align: center;
  font-family: var(--saed-mono);
  font-size: 0.68rem;
  letter-spacing: 0.12em;
  color: var(--saed-text-faint);
}
.saed-kb-hint kbd {
  font-family: inherit;
  color: var(--saed-text-dim);
  border: 1px solid var(--saed-border);
  border-radius: 3px;
  padding: 0 0.35em;
  margin: 0 0.1em;
}

/* ============================================================
   表紙の背景シーン（奥行き演出）
   ・マウス追従なし。すべてゆっくりした自動アニメーション
   ・遠い粒／近い粒の2層 + 透視グリッドの床 + 地平線の光 + ホログラムのリング
   ============================================================ */
.saed-title-scene {
  position: absolute;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  overflow: hidden;
  background:
    radial-gradient(ellipse 70% 60% at 50% 40%, rgba(74, 222, 128, 0.10), transparent 65%),
    linear-gradient(180deg, #03080a 0%, #061210 55%, #03080a 100%);
}

/* 光の粒：遠い層は小さく暗く遅い、近い層は大きく明るく速い */
.saed-scene-stars {
  position: absolute;
  inset: -30% 0 0 0;
  background-repeat: repeat;
}
.saed-scene-stars-far {
  background-image:
    radial-gradient(1px 1px at 12% 18%, rgba(187, 247, 208, 0.55) 50%, transparent 55%),
    radial-gradient(1px 1px at 48% 62%, rgba(187, 247, 208, 0.45) 50%, transparent 55%),
    radial-gradient(1px 1px at 78% 30%, rgba(253, 230, 138, 0.45) 50%, transparent 55%),
    radial-gradient(1px 1px at 30% 84%, rgba(187, 247, 208, 0.40) 50%, transparent 55%),
    radial-gradient(1px 1px at 90% 76%, rgba(187, 247, 208, 0.35) 50%, transparent 55%),
    radial-gradient(1px 1px at 62% 8%, rgba(253, 230, 138, 0.35) 50%, transparent 55%);
  background-size: 240px 240px;
  opacity: 0.8;
  animation: saed-rise-far 70s linear infinite;
}
.saed-scene-stars-near {
  background-image:
    radial-gradient(2px 2px at 20% 40%, rgba(187, 247, 208, 0.9) 50%, transparent 60%),
    radial-gradient(2px 2px at 66% 22%, rgba(253, 230, 138, 0.8) 50%, transparent 60%),
    radial-gradient(3px 3px at 84% 70%, rgba(187, 247, 208, 0.7) 50%, transparent 60%),
    radial-gradient(2px 2px at 40% 90%, rgba(187, 247, 208, 0.75) 50%, transparent 60%);
  background-size: 420px 420px;
  opacity: 0.9;
  filter: drop-shadow(0 0 4px rgba(74, 222, 128, 0.6));
  animation: saed-rise-near 32s linear infinite;
}
@keyframes saed-rise-far  { from { background-position: 0 0; } to { background-position: 0 -240px; } }
@keyframes saed-rise-near { from { background-position: 0 0; } to { background-position: 0 -420px; } }

/* 透視グリッドの床：奥（地平線）へ向かって消えていき、手前へゆっくり流れる */
.saed-scene-floor {
  position: absolute;
  left: -35%;
  right: -35%;
  bottom: -8%;
  height: 52%;
  background-image:
    linear-gradient(rgba(74, 222, 128, 0.32) 1px, transparent 1px),
    linear-gradient(90deg, rgba(74, 222, 128, 0.32) 1px, transparent 1px);
  background-size: 72px 72px;
  transform: perspective(560px) rotateX(64deg);
  transform-origin: top center;
  -webkit-mask-image: linear-gradient(to bottom, transparent 0%, #000 28%, #000 85%, transparent 100%);
  mask-image: linear-gradient(to bottom, transparent 0%, #000 28%, #000 85%, transparent 100%);
  animation: saed-floor-flow 6s linear infinite;
}
@keyframes saed-floor-flow { from { background-position: 0 0; } to { background-position: 0 72px; } }

/* 地平線の光 */
.saed-scene-horizon {
  position: absolute;
  left: 8%;
  right: 8%;
  top: 56%;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--saed-accent) 30%, var(--saed-ok) 70%, transparent);
  box-shadow: 0 0 22px 4px rgba(74, 222, 128, 0.35);
  opacity: 0.75;
  animation: saed-horizon-breathe 5s ease-in-out infinite;
}
.saed-scene-horizon::after {
  content: "";
  position: absolute;
  left: 15%;
  right: 15%;
  top: 2px;
  height: 90px;
  background: radial-gradient(ellipse 60% 100% at 50% 0%, rgba(74, 222, 128, 0.28), transparent 70%);
}
@keyframes saed-horizon-breathe {
  0%, 100% { opacity: 0.6; }
  50% { opacity: 0.95; }
}

/* さえちゃんの背後で静かに回るホログラムのリング */
.saed-scene-ring {
  position: absolute;
  left: 50%;
  top: calc(50% - 150px);
  width: 250px;
  height: 250px;
  margin: -125px 0 0 -125px;
  border-radius: 50%;
  border: 1px dashed rgba(74, 222, 128, 0.45);
  box-shadow: inset 0 0 50px rgba(74, 222, 128, 0.10), 0 0 30px rgba(74, 222, 128, 0.10);
  animation: saed-ring-spin 48s linear infinite;
}
.saed-scene-ring::before {
  content: "";
  position: absolute;
  inset: 22px;
  border-radius: 50%;
  border: 1px solid rgba(253, 230, 138, 0.35);
  border-top-color: transparent;
  border-bottom-color: transparent;
  animation: saed-ring-spin-rev 30s linear infinite;
}
.saed-scene-ring::after {
  content: "";
  position: absolute;
  inset: 50px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(74, 222, 128, 0.16), transparent 70%);
}
@keyframes saed-ring-spin { to { transform: rotate(360deg); } }
@keyframes saed-ring-spin-rev { to { transform: rotate(-360deg); } }

/* 周辺を暗く落として中央に奥行きを集める */
.saed-scene-vignette {
  position: absolute;
  inset: 0;
  background:
    repeating-linear-gradient(0deg, rgba(0, 0, 0, 0.10) 0 1px, transparent 1px 4px),
    radial-gradient(ellipse 62% 60% at 50% 45%, transparent 45%, rgba(3, 8, 10, 0.78) 100%);
}

@media (max-width: 600px) {
  #screen-title { min-height: min(70vh, 640px); }
  .saed-scene-ring { width: 200px; height: 200px; margin: -100px 0 0 -100px; }
  .saed-scene-floor { background-size: 56px 56px; }
}