/* ===== 共通スタイル：算数マスター ===== */
* { box-sizing: border-box; margin: 0; padding: 0; }
body {
  font-family: 'Hiragino Maru Gothic ProN', 'ヒラギノ丸ゴ ProN W4', 'Yu Gothic', sans-serif;
  background: linear-gradient(135deg, #fef3c7 0%, #fce7f3 50%, #dbeafe 100%);
  min-height: 100vh;
  color: #1f2937;
  padding: 20px;
}
.container { max-width: 900px; margin: 0 auto; }

header {
  text-align: center;
  background: white;
  border-radius: 24px;
  padding: 30px 20px;
  box-shadow: 0 10px 30px rgba(0,0,0,0.1);
  margin-bottom: 16px;
}
h1 { font-size: 2.2em; color: #ec4899; margin-bottom: 8px; }
header p { color: #6b7280; font-size: 1.05em; }
header .back {
  position: absolute;
  margin-top: -10px;
  margin-left: 20px;
  background: white;
  padding: 6px 14px;
  border-radius: 999px;
  font-size: 0.85em;
  color: #6b7280;
  text-decoration: none;
  box-shadow: 0 2px 8px rgba(0,0,0,0.08);
}

/* ステータスバー */
.status-bar {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 12px;
  margin-bottom: 24px;
}
.status-card {
  background: white;
  border-radius: 16px;
  padding: 14px;
  text-align: center;
  box-shadow: 0 4px 12px rgba(0,0,0,0.08);
}
.status-card .icon { font-size: 1.8em; margin-bottom: 4px; }
.status-card .num { font-size: 1.6em; font-weight: bold; color: #ec4899; }
.status-card .label { font-size: 0.8em; color: #6b7280; }
.status-card.streak .num { color: #f59e0b; }
.status-card.master .num { color: #10b981; }
.status-card.today .num { color: #3b82f6; }

.nav {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  justify-content: center;
  margin-bottom: 24px;
}
.nav button {
  padding: 10px 16px;
  border: none;
  border-radius: 999px;
  background: white;
  font-size: 0.95em;
  font-weight: bold;
  cursor: pointer;
  box-shadow: 0 4px 12px rgba(0,0,0,0.08);
  transition: transform 0.15s, background 0.15s;
}
.nav button:hover { transform: translateY(-2px); }
.nav button.active { background: #ec4899; color: white; }
.nav button.daily { background: linear-gradient(135deg, #fbbf24, #ec4899); color: white; }
.nav button.daily.active { background: #ec4899; }

.card {
  background: white;
  border-radius: 24px;
  padding: 28px;
  box-shadow: 0 10px 30px rgba(0,0,0,0.1);
  margin-bottom: 24px;
}
.card h2 { font-size: 1.7em; margin-bottom: 16px; }
.card h3 { font-size: 1.2em; color: #374151; margin: 16px 0 8px; }
.section { display: none; }
.section.active { display: block; }

/* ヒント・チップ */
.tip {
  background: linear-gradient(135deg, #fef3c7, #fde68a);
  border-left: 6px solid #f59e0b;
  padding: 14px 18px;
  border-radius: 12px;
  margin: 14px 0;
  font-size: 1em;
  line-height: 1.6;
}
.tip strong { color: #92400e; }
.tip-blue {
  background: linear-gradient(135deg, #dbeafe, #bfdbfe);
  border-left-color: #3b82f6;
}
.tip-blue strong { color: #1e40af; }
.tip-green {
  background: linear-gradient(135deg, #d1fae5, #a7f3d0);
  border-left-color: #10b981;
}
.tip-green strong { color: #065f46; }
.big-number { font-size: 1.8em; color: #ec4899; font-weight: bold; }

/* 例カード */
.examples {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 12px;
  margin: 16px 0;
}
.example {
  background: #fef3c7;
  border-radius: 14px;
  padding: 16px;
  text-align: center;
}
.example .icon { font-size: 2.5em; margin-bottom: 6px; }
.example .label { font-weight: bold; color: #92400e; font-size: 0.95em; }
.example .value { color: #78350f; margin-top: 4px; font-size: 0.9em; }

/* かいだん（単位の階段） */
.stairs {
  display: flex;
  align-items: flex-end;
  justify-content: center;
  gap: 4px;
  margin: 24px 0;
  padding: 16px;
  background: #f9fafb;
  border-radius: 16px;
  flex-wrap: wrap;
}
.step {
  background: linear-gradient(135deg, #fbbf24, #f59e0b);
  color: white;
  padding: 12px 8px;
  border-radius: 8px;
  text-align: center;
  font-weight: bold;
  box-shadow: 0 4px 8px rgba(0,0,0,0.1);
  min-width: 80px;
}
.step .name { font-size: 1.2em; }
.step .value { font-size: 0.8em; opacity: 0.9; margin-top: 4px; }
.step.s1 { height: 70px; }
.step.s2 { height: 110px; background: linear-gradient(135deg, #34d399, #10b981); }
.step.s3 { height: 150px; background: linear-gradient(135deg, #60a5fa, #3b82f6); }
.step.s4 { height: 190px; background: linear-gradient(135deg, #a78bfa, #8b5cf6); }
.step.s5 { height: 230px; background: linear-gradient(135deg, #f472b6, #ec4899); }
.arrow { align-self: center; font-size: 1.4em; color: #6b7280; padding: 0 4px; }

/* クイズ */
.quiz {
  background: #fef3c7;
  border-radius: 16px;
  padding: 22px;
  margin: 16px 0;
}
.quiz-q {
  font-size: 1.25em;
  margin-bottom: 16px;
  background: white;
  padding: 18px;
  border-radius: 12px;
  text-align: center;
  line-height: 1.6;
}
.quiz-tag {
  display: inline-block;
  background: #ec4899;
  color: white;
  font-size: 0.7em;
  padding: 2px 8px;
  border-radius: 999px;
  margin-right: 8px;
  vertical-align: middle;
}
.quiz-options {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 10px;
}
.quiz-options button {
  padding: 14px;
  font-size: 1.1em;
  border: 3px solid #fbbf24;
  background: white;
  border-radius: 12px;
  cursor: pointer;
  font-weight: bold;
  transition: all 0.15s;
}
.quiz-options button:hover:not(:disabled) {
  background: #fef3c7;
  transform: translateY(-2px);
}
.quiz-options button:disabled { cursor: default; }
.quiz-options button.correct {
  background: #10b981;
  color: white;
  border-color: #047857;
}
.quiz-options button.wrong {
  background: #ef4444;
  color: white;
  border-color: #b91c1c;
}
.quiz-feedback {
  margin-top: 16px;
  padding: 16px;
  border-radius: 12px;
  font-weight: bold;
  text-align: center;
  display: none;
  font-size: 1.05em;
  line-height: 1.6;
}
.quiz-feedback.show { display: block; }
.quiz-feedback.ok { background: #d1fae5; color: #065f46; }
.quiz-feedback.ng { background: #fee2e2; color: #991b1b; }
.quiz-feedback .why {
  margin-top: 8px;
  background: white;
  padding: 12px;
  border-radius: 8px;
  color: #1f2937;
  font-weight: normal;
  text-align: left;
}
.quiz-feedback .why strong { color: #ec4899; }

.progress-bar {
  background: #e5e7eb;
  height: 12px;
  border-radius: 999px;
  overflow: hidden;
  margin: 12px 0;
}
.progress-bar-fill {
  background: linear-gradient(90deg, #fbbf24, #ec4899);
  height: 100%;
  transition: width 0.4s;
  border-radius: 999px;
}

/* Leitner */
.leitner, .leitner-grid {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 6px;
  margin: 12px 0;
}
.lbox {
  background: #f9fafb;
  border-radius: 12px;
  padding: 10px 4px;
  text-align: center;
  border: 2px solid #e5e7eb;
}
.lbox.b0 { background: #f3f4f6; border-color: #9ca3af; }
.lbox.b1 { background: #fee2e2; border-color: #fca5a5; }
.lbox.b2 { background: #fef3c7; border-color: #fcd34d; }
.lbox.b3 { background: #dbeafe; border-color: #93c5fd; }
.lbox.b4 { background: #ddd6fe; border-color: #a78bfa; }
.lbox.b5 { background: #d1fae5; border-color: #6ee7b7; }
.lbox .num { font-size: 1.5em; font-weight: bold; color: #1f2937; line-height: 1; }
.lbox .name { font-size: 0.68em; color: #4b5563; margin-top: 4px; line-height: 1.2; }

.leitner-summary {
  text-align: center;
  font-size: 0.95em;
  color: #4b5563;
  margin-bottom: 8px;
  padding: 8px 12px;
  background: #f9fafb;
  border-radius: 12px;
}
.leitner-summary strong { color: #ec4899; font-size: 1.15em; }

.leitner-progress-bar {
  background: #e5e7eb;
  height: 8px;
  border-radius: 999px;
  overflow: hidden;
  margin: 8px 0 4px;
}
.leitner-progress-fill {
  background: linear-gradient(90deg, #fbbf24, #ec4899, #10b981);
  height: 100%;
  transition: width 0.6s ease-out;
  border-radius: 999px;
}

/* マスタリー */
.mastery {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 12px;
  margin: 12px 0;
}
.mastery-item {
  background: #f9fafb;
  padding: 14px;
  border-radius: 12px;
  text-align: center;
}
.mastery-item .label { font-size: 0.95em; font-weight: bold; margin-bottom: 6px; }
.mastery-item .stars { font-size: 1.2em; letter-spacing: 2px; }

.big-btn {
  display: block;
  width: 100%;
  padding: 18px;
  font-size: 1.3em;
  font-weight: bold;
  background: linear-gradient(135deg, #fbbf24, #ec4899);
  color: white;
  border: none;
  border-radius: 16px;
  cursor: pointer;
  box-shadow: 0 6px 16px rgba(236, 72, 153, 0.3);
  transition: transform 0.15s;
  margin: 14px 0;
}
.big-btn:hover { transform: translateY(-2px); }
.big-btn:disabled { background: #d1d5db; box-shadow: none; cursor: default; }

.celebration {
  text-align: center;
  padding: 28px;
  background: linear-gradient(135deg, #fef3c7, #fce7f3);
  border-radius: 20px;
  margin: 14px 0;
}
.celebration .big { font-size: 4em; margin-bottom: 8px; }
.celebration h3 { font-size: 1.6em; color: #ec4899; margin-bottom: 8px; }

.parent-section {
  background: #f9fafb;
  padding: 18px;
  border-radius: 12px;
  margin: 14px 0;
  border-left: 4px solid #6b7280;
}
.parent-section h3 { color: #374151; margin-bottom: 8px; }
.parent-section ul { padding-left: 20px; line-height: 1.8; }

footer { text-align: center; color: #6b7280; padding: 20px; font-size: 0.9em; }

/* インデックス画面の学年カード */
.grade-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 16px;
  margin: 20px 0;
}
.grade-card {
  display: block;
  background: white;
  border-radius: 20px;
  padding: 24px;
  text-decoration: none;
  color: #1f2937;
  box-shadow: 0 6px 20px rgba(0,0,0,0.1);
  transition: transform 0.2s, box-shadow 0.2s;
  border: 4px solid transparent;
}
.grade-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 10px 30px rgba(0,0,0,0.15);
}
.grade-card .grade-num {
  font-size: 3em;
  font-weight: bold;
  text-align: center;
  margin-bottom: 4px;
}
.grade-card .grade-label {
  text-align: center;
  font-size: 1em;
  color: #6b7280;
  margin-bottom: 12px;
}
.grade-card .grade-topics {
  font-size: 0.85em;
  color: #4b5563;
  text-align: center;
  margin-bottom: 12px;
  line-height: 1.5;
}
.grade-card .grade-stats {
  display: flex;
  justify-content: space-around;
  font-size: 0.85em;
  border-top: 1px dashed #e5e7eb;
  padding-top: 10px;
  color: #6b7280;
}
.grade-card .grade-stats strong { color: #ec4899; font-size: 1.1em; }
.grade-card.g1 { border-color: #fca5a5; }
.grade-card.g2 { border-color: #fcd34d; }
.grade-card.g3 { border-color: #6ee7b7; }
.grade-card.g4 { border-color: #93c5fd; }
.grade-card.g5 { border-color: #a78bfa; }
.grade-card.g6 { border-color: #f472b6; }
.grade-card.g1 .grade-num { color: #ef4444; }
.grade-card.g2 .grade-num { color: #f59e0b; }
.grade-card.g3 .grade-num { color: #10b981; }
.grade-card.g4 .grade-num { color: #3b82f6; }
.grade-card.g5 .grade-num { color: #8b5cf6; }
.grade-card.g6 .grade-num { color: #ec4899; }

@keyframes pop {
  0% { transform: scale(1); }
  50% { transform: scale(1.15); }
  100% { transform: scale(1); }
}
.pop { animation: pop 0.4s ease-in-out; }

@keyframes shake {
  0%, 100% { transform: translateX(0); }
  20%, 60% { transform: translateX(-8px); }
  40%, 80% { transform: translateX(8px); }
}
.shake { animation: shake 0.4s ease-in-out; }

@keyframes bounce-in {
  0% { transform: scale(0); opacity: 0; }
  60% { transform: scale(1.2); opacity: 1; }
  100% { transform: scale(1); }
}
.bounce-in { animation: bounce-in 0.5s ease-out; }

/* 設定パネル（フローティング） */
.settings-fab {
  position: fixed;
  bottom: 20px;
  right: 20px;
  width: 56px;
  height: 56px;
  border-radius: 50%;
  background: white;
  border: none;
  font-size: 1.6em;
  cursor: pointer;
  box-shadow: 0 4px 16px rgba(0,0,0,0.2);
  z-index: 100;
  transition: transform 0.2s;
}
.settings-fab:hover { transform: rotate(45deg); }

.settings-menu {
  position: fixed;
  bottom: 90px;
  right: 20px;
  background: white;
  border-radius: 16px;
  box-shadow: 0 8px 24px rgba(0,0,0,0.15);
  padding: 16px;
  min-width: 220px;
  z-index: 100;
  display: none;
}
.settings-menu.show { display: block; animation: bounce-in 0.3s ease-out; }
.settings-menu h4 { font-size: 1em; color: #374151; margin-bottom: 10px; }
.settings-menu label {
  display: flex;
  align-items: center;
  padding: 8px 4px;
  cursor: pointer;
  font-size: 0.95em;
}
.settings-menu label:hover { background: #f9fafb; border-radius: 8px; }
.settings-menu input[type="checkbox"] { margin-right: 10px; transform: scale(1.3); }
.settings-menu input[type="range"] { width: 100%; margin-top: 8px; }

/* 読み上げボタン */
.speak-btn {
  display: inline-block;
  background: #dbeafe;
  border: 2px solid #93c5fd;
  border-radius: 999px;
  padding: 4px 10px;
  font-size: 0.85em;
  cursor: pointer;
  margin-left: 8px;
  vertical-align: middle;
  transition: background 0.15s;
}
.speak-btn:hover { background: #bfdbfe; }
.speak-btn:active { transform: scale(0.95); }
.speak-btn.speaking { background: #3b82f6; color: white; border-color: #1e40af; }

/* 学習カレンダー（heatmap） */
.calendar-wrap {
  margin: 16px 0;
}
.calendar-grid {
  display: grid;
  grid-template-columns: repeat(15, 1fr);
  gap: 3px;
  max-width: 480px;
  margin: 0 auto;
}
.cal-cell {
  aspect-ratio: 1;
  background: #e5e7eb;
  border-radius: 3px;
  position: relative;
  transition: transform 0.15s;
}
.cal-cell.done {
  background: linear-gradient(135deg, #fbbf24, #ec4899);
}
.cal-cell.today {
  outline: 2px solid #3b82f6;
  outline-offset: 1px;
}
.cal-cell:hover {
  transform: scale(1.3);
  z-index: 2;
}
.calendar-stats {
  text-align: center;
  margin-top: 12px;
  font-size: 0.95em;
  color: #4b5563;
}
.calendar-stats strong { color: #ec4899; font-size: 1.2em; }

/* Confetti canvas はJSで挿入 */
canvas.confetti-canvas {
  position: fixed;
  top: 0; left: 0;
  width: 100%; height: 100%;
  pointer-events: none;
  z-index: 9998;
}

/* マスコット「ピカりん」 */
.mascot {
  display: inline-block;
  vertical-align: middle;
  user-select: none;
  cursor: pointer;
  transform-origin: 50% 90%;
  filter: drop-shadow(0 4px 8px rgba(0,0,0,0.12));
  transition: filter 0.2s;
}
.mascot:hover { filter: drop-shadow(0 6px 14px rgba(236,72,153,0.3)); }
.mascot.idle { animation: mascot-breath 3.5s ease-in-out infinite; }
.mascot.hop { animation: mascot-hop 0.6s cubic-bezier(0.36, 0, 0.66, -0.56); }
.mascot.dance { animation: mascot-dance 1.4s ease-in-out infinite; }
.mascot.shake { animation: mascot-shake 0.5s ease-in-out; }

@keyframes mascot-breath {
  0%, 100% { transform: scale(1) translateY(0); }
  40% { transform: scale(1.03, 0.97) translateY(0); }
  50% { transform: scale(1) translateY(-2px); }
  60% { transform: scale(0.98, 1.02) translateY(0); }
}
@keyframes mascot-hop {
  0%, 100% { transform: translateY(0) rotate(0); }
  20% { transform: translateY(-6px) scale(1.05, 0.92); }
  40% { transform: translateY(-30px) rotate(-8deg) scale(0.95, 1.05); }
  60% { transform: translateY(-15px) rotate(6deg); }
  80% { transform: translateY(0) scale(1.08, 0.92); }
}
@keyframes mascot-dance {
  0%, 100% { transform: translateY(0) rotate(0); }
  20% { transform: translateY(-8px) rotate(-10deg); }
  40% { transform: translateY(0) rotate(0); }
  60% { transform: translateY(-12px) rotate(10deg); }
  80% { transform: translateY(0) rotate(-3deg); }
}
@keyframes mascot-shake {
  0%, 100% { transform: translateX(0) rotate(0); }
  15% { transform: translateX(-12px) rotate(-3deg); }
  30% { transform: translateX(12px) rotate(3deg); }
  50% { transform: translateX(-8px) rotate(-2deg); }
  70% { transform: translateX(8px) rotate(2deg); }
}

/* 瞬き — 全マスコット共通 */
.mascot .eye-l, .mascot .eye-r {
  transform-origin: center;
  animation: mascot-blink 5s ease-in-out infinite;
}
.mascot .eye-r { animation-delay: 0.05s; }
@keyframes mascot-blink {
  0%, 90%, 100% { transform: scaleY(1); }
  93%, 96% { transform: scaleY(0.1); }
}

/* 耳のピクピク（左：垂れ、右：ピン） */
.mascot.idle path[d^="M132 36"] {
  transform-origin: 132px 36px;
  animation: ear-twitch 7s ease-in-out infinite;
}
@keyframes ear-twitch {
  0%, 92%, 100% { transform: rotate(0); }
  94% { transform: rotate(-15deg); }
  96% { transform: rotate(8deg); }
  98% { transform: rotate(-3deg); }
}

/* しっぽ振り */
.mascot.idle path[d^="M40 160"] {
  transform-origin: 40px 160px;
  animation: tail-wag 2.5s ease-in-out infinite;
}
@keyframes tail-wag {
  0%, 100% { transform: rotate(0); }
  50% { transform: rotate(-12deg); }
}

/* スピーチバブル */
.speech-bubble {
  position: relative;
  background: white;
  border: 3px solid #ec4899;
  border-radius: 18px;
  padding: 10px 16px;
  font-weight: bold;
  color: #831843;
  display: inline-block;
  margin-bottom: 4px;
  font-size: 1.05em;
  box-shadow: 0 2px 8px rgba(0,0,0,0.08);
  animation: bubble-pop 0.4s ease-out;
}
.speech-bubble::after {
  content: '';
  position: absolute;
  bottom: -14px;
  left: 30px;
  width: 0; height: 0;
  border: 8px solid transparent;
  border-top-color: #ec4899;
}
.speech-bubble::before {
  content: '';
  position: absolute;
  bottom: -10px;
  left: 32px;
  width: 0; height: 0;
  border: 6px solid transparent;
  border-top-color: white;
  z-index: 1;
}
@keyframes bubble-pop {
  0% { transform: scale(0); opacity: 0; }
  60% { transform: scale(1.1); opacity: 1; }
  100% { transform: scale(1); }
}

.mascot-row {
  display: flex;
  align-items: flex-end;
  justify-content: center;
  gap: 8px;
  margin: 16px 0 8px;
  flex-wrap: wrap;
}
.mascot-row .speech-bubble { align-self: flex-end; margin-bottom: 12px; }