/* ==========================================
   ゆっくり解説！概数計算機
   Prefix: src-
   ========================================== */

.src-wrapper {
  --src-base: #ffffff;
  --src-base-light: #fafafa;
  --src-base-dark: #f5f5f5;
  --src-main: #1e3a5f;
  --src-main-light: #2d5a8f;
  --src-main-dark: #0f1e3a;
  --src-accent: #d4af37;
  --src-accent-light: #f4cf5f;
  --src-accent-dark: #b8941f;
  --src-text: #2c3e50;
  --src-text-light: #64748b;
  --src-border: #e8e8e8;
  --src-success: #10b981;
  --src-danger: #ef4444;
  --src-warning: #f59e0b;
  --src-shadow: 0 4px 20px rgba(30, 58, 95, 0.1);
  --src-shadow-hover: 0 8px 30px rgba(30, 58, 95, 0.16);
  --src-digit-size: clamp(2.1rem, 7vw, 4.2rem);
  width: 100% !important;
  max-width: 100% !important;
  margin: 0 auto !important;
  padding: 0 0 18px !important;
  background: linear-gradient(135deg, #ffffff 0%, #f8f9fa 52%, #f0f2f5 100%) !important;
  color: var(--src-text) !important;
  font-family: "UD Digi Kyokasho N-R", "UD デジタル 教科書体 N-R", "Noto Sans JP", sans-serif !important;
  border-radius: 18px !important;
  overflow: hidden !important;
}

.src-wrapper * {
  box-sizing: border-box !important;
}

.src-header {
  width: 100% !important;
  background: var(--src-main) !important;
  border-top: 3px solid var(--src-accent) !important;
  border-bottom: 3px solid var(--src-accent) !important;
  padding: clamp(14px, 2.2vw, 22px) 16px !important;
  text-align: center !important;
  color: #fff !important;
  position: relative !important;
  overflow: hidden !important;
}

.src-header::before {
  content: '' !important;
  position: absolute !important;
  top: 0 !important;
  left: -120% !important;
  width: 220% !important;
  height: 100% !important;
  background: linear-gradient(90deg, transparent, rgba(212, 175, 55, 0.18), transparent) !important;
  animation: src-shine 4s infinite !important;
}

@keyframes src-shine {
  0% { left: -120%; }
  100% { left: 120%; }
}

.src-header h1 {
  margin: 0 !important;
  color: #fff !important;
  font-size: clamp(1.35rem, 4.5vw, 2rem) !important;
  font-weight: 900 !important;
  line-height: 1.25 !important;
  text-shadow: 0 2px 8px rgba(0,0,0,0.3) !important;
  position: relative !important;
  z-index: 1 !important;
}

.src-header p {
  margin: 8px 0 0 !important;
  color: rgba(255,255,255,0.88) !important;
  font-size: clamp(0.9rem, 2.6vw, 1.05rem) !important;
  font-weight: 700 !important;
  position: relative !important;
  z-index: 1 !important;
}

.src-main-tabs {
  display: flex !important;
  gap: 8px !important;
  padding: 14px 14px 0 !important;
  background: var(--src-main) !important;
  border-bottom: 3px solid var(--src-accent) !important;
}

.src-main-tab-btn {
  padding: 10px clamp(14px, 3vw, 30px) !important;
  border: none !important;
  border-radius: 12px 12px 0 0 !important;
  background: rgba(255,255,255,0.15) !important;
  color: rgba(255,255,255,0.78) !important;
  font-size: clamp(0.9rem, 2.5vw, 1rem) !important;
  font-weight: 900 !important;
  cursor: pointer !important;
  transition: all 0.18s !important;
}

.src-main-tab-btn:hover {
  background: rgba(255,255,255,0.28) !important;
  color: #fff !important;
}

.src-main-tab-btn.src-main-tab-active {
  background: var(--src-base) !important;
  color: var(--src-main) !important;
}

.src-section {
  display: none !important;
  width: 100% !important;
}

.src-section.src-tab-active {
  display: block !important;
}

.src-app-area,
.src-practice-area,
.src-rule-area {
  width: min(1180px, 98%) !important;
  margin: 18px auto 0 !important;
  background: var(--src-base) !important;
  border: 2px solid var(--src-border) !important;
  border-radius: 24px !important;
  padding: clamp(12px, 2vw, 22px) !important;
  box-shadow: var(--src-shadow) !important;
  position: relative !important;
  overflow: hidden !important;
}

.src-app-area::before,
.src-practice-area::before,
.src-rule-area::before {
  content: '' !important;
  position: absolute !important;
  top: 0 !important;
  left: 0 !important;
  right: 0 !important;
  height: 4px !important;
  background: linear-gradient(90deg, var(--src-accent), var(--src-accent-light), var(--src-accent)) !important;
}

.src-settings-panel {
  display: grid !important;
  grid-template-columns: 1.2fr 1.2fr 0.9fr !important;
  gap: 12px !important;
  align-items: end !important;
  background: #f8fafc !important;
  border: 1px solid #e2e8f0 !important;
  border-radius: 18px !important;
  padding: 14px !important;
  margin-bottom: 12px !important;
}

.src-field {
  min-width: 0 !important;
}

.src-field label,
.src-label-text {
  display: block !important;
  color: var(--src-main) !important;
  font-size: 0.9rem !important;
  font-weight: 900 !important;
  margin-bottom: 6px !important;
}

.src-number-input,
.src-select,
.src-prac-answer {
  width: 100% !important;
  border: 2px solid var(--src-border) !important;
  border-radius: 14px !important;
  background: #fff !important;
  color: var(--src-text) !important;
  font-weight: 900 !important;
  outline: none !important;
  transition: all 0.18s !important;
}

.src-number-input {
  font-family: "Courier New", monospace !important;
  font-size: clamp(1.4rem, 4vw, 2rem) !important;
  padding: 10px 14px !important;
  letter-spacing: 0.04em !important;
}

.src-select {
  font-size: 1rem !important;
  padding: 12px 12px !important;
  min-height: 48px !important;
}

.src-number-input:focus,
.src-select:focus,
.src-prac-answer:focus {
  border-color: var(--src-accent) !important;
  box-shadow: 0 0 0 4px rgba(212,175,55,0.16) !important;
}

.src-help-text {
  color: var(--src-text-light) !important;
  font-size: 0.78rem !important;
  font-weight: 700 !important;
  margin-top: 4px !important;
}

.src-chip-row {
  display: flex !important;
  gap: 8px !important;
  flex-wrap: wrap !important;
}

.src-chip {
  flex: 1 1 150px !important;
  border: 2px solid var(--src-main) !important;
  background: #fff !important;
  color: var(--src-main) !important;
  border-radius: 999px !important;
  padding: 12px 14px !important;
  font-size: clamp(0.9rem, 2.4vw, 1rem) !important;
  font-weight: 900 !important;
  cursor: pointer !important;
  transition: all 0.18s !important;
}

.src-chip:hover,
.src-chip.src-chip-active {
  background: var(--src-main) !important;
  color: #fff !important;
  transform: translateY(-1px) !important;
}

.src-hidden {
  display: none !important;
}

.src-mission-card {
  text-align: center !important;
  background: #fff !important;
  border: 3px solid var(--src-main) !important;
  border-radius: 18px !important;
  padding: 12px 14px !important;
  margin: 12px 0 !important;
  box-shadow: inset 0 0 0 5px rgba(30,58,95,0.04) !important;
}

.src-mission-label {
  display: inline-block !important;
  background: var(--src-main) !important;
  color: #fff !important;
  border-radius: 999px !important;
  padding: 4px 14px !important;
  font-weight: 900 !important;
  font-size: 0.82rem !important;
}

.src-mission-text {
  margin-top: 8px !important;
  color: var(--src-main) !important;
  font-size: clamp(1.4rem, 4.5vw, 2.35rem) !important;
  font-weight: 900 !important;
  line-height: 1.2 !important;
}

.src-board {
  position: relative !important;
  background: #fff !important;
  border: 4px solid #000 !important;
  border-radius: 18px !important;
  padding: clamp(14px, 3vw, 26px) 10px 18px !important;
  min-height: 210px !important;
  overflow-x: auto !important;
  overflow-y: hidden !important;
  box-shadow: inset 0 0 0 6px rgba(0,0,0,0.025) !important;
}

.src-digit-row,
.src-place-row {
  display: flex !important;
  justify-content: center !important;
  align-items: stretch !important;
  min-width: max-content !important;
}

.src-place-row {
  margin-top: 8px !important;
}

.src-digit-cell {
  position: relative !important;
  width: clamp(58px, 10vw, 104px) !important;
  min-width: clamp(58px, 10vw, 104px) !important;
  height: clamp(74px, 13vw, 126px) !important;
  display: flex !important;
  align-items: center !important;
  justify-content: center !important;
  border-left: 2px solid #000 !important;
  background: linear-gradient(180deg, #fff 0%, #f8fafc 100%) !important;
  transition: all 0.25s !important;
}

.src-digit-cell:last-child {
  border-right: 2px solid #000 !important;
}

.src-digit-card {
  width: 78% !important;
  height: 80% !important;
  border: 3px solid #cbd5e1 !important;
  border-radius: 16px !important;
  display: flex !important;
  align-items: center !important;
  justify-content: center !important;
  background: #fff !important;
  color: #000 !important;
  font-family: "Courier New", monospace !important;
  font-size: var(--src-digit-size) !important;
  font-weight: 900 !important;
  line-height: 1 !important;
  box-shadow: 0 4px 10px rgba(0,0,0,0.08) !important;
}

.src-place-cell {
  width: clamp(58px, 10vw, 104px) !important;
  min-width: clamp(58px, 10vw, 104px) !important;
  text-align: center !important;
  color: var(--src-main) !important;
  font-size: clamp(0.72rem, 2vw, 0.92rem) !important;
  font-weight: 900 !important;
  line-height: 1.25 !important;
  padding: 4px 2px !important;
}

.src-digit-cell.src-target-cell .src-digit-card {
  border-color: var(--src-main) !important;
  background: #eff6ff !important;
  color: var(--src-main) !important;
  transform: translateY(-4px) !important;
  box-shadow: 0 8px 18px rgba(30,58,95,0.22) !important;
}

.src-digit-cell.src-round-cell .src-digit-card {
  border-color: var(--src-accent) !important;
  background: #fffbeb !important;
  color: #92400e !important;
  transform: translateY(-4px) scale(1.04) !important;
  box-shadow: 0 0 0 5px rgba(212,175,55,0.18), 0 8px 20px rgba(212,175,55,0.28) !important;
}

.src-digit-cell.src-zero-cell .src-digit-card {
  background: #f1f5f9 !important;
  color: #94a3b8 !important;
  border-color: #e2e8f0 !important;
}

.src-line-after::after {
  content: '' !important;
  position: absolute !important;
  top: -12px !important;
  right: -4px !important;
  width: 7px !important;
  height: calc(100% + 34px) !important;
  background: var(--src-danger) !important;
  border-radius: 999px !important;
  box-shadow: 0 0 0 5px rgba(239,68,68,0.16), 0 0 18px rgba(239,68,68,0.55) !important;
  z-index: 8 !important;
  animation: src-line-in 0.35s cubic-bezier(0.34,1.56,0.64,1) both !important;
}

@keyframes src-line-in {
  from { transform: scaleY(0.05); opacity: 0; }
  to { transform: scaleY(1); opacity: 1; }
}

.src-arrow-label {
  position: absolute !important;
  left: 50% !important;
  bottom: -28px !important;
  transform: translateX(-50%) !important;
  background: var(--src-accent) !important;
  color: #1a1a1a !important;
  border-radius: 999px !important;
  padding: 4px 10px !important;
  white-space: nowrap !important;
  font-size: 0.78rem !important;
  font-weight: 900 !important;
  z-index: 20 !important;
  box-shadow: 0 4px 10px rgba(0,0,0,0.12) !important;
}

.src-step-panel {
  min-height: 110px !important;
  margin: 14px 0 10px !important;
  padding: 14px 16px !important;
  background: #f8fafc !important;
  border: 2px solid #e2e8f0 !important;
  border-radius: 18px !important;
  text-align: center !important;
}

.src-step-badge {
  display: inline-block !important;
  min-width: 70px !important;
  background: var(--src-main) !important;
  color: #fff !important;
  border-radius: 999px !important;
  padding: 4px 10px !important;
  font-size: 0.84rem !important;
  font-weight: 900 !important;
}

.src-step-title {
  margin-top: 8px !important;
  color: var(--src-main) !important;
  font-size: clamp(1.2rem, 3.6vw, 1.7rem) !important;
  font-weight: 900 !important;
}

.src-step-message {
  margin-top: 6px !important;
  color: var(--src-text) !important;
  font-size: clamp(1rem, 2.7vw, 1.25rem) !important;
  font-weight: 800 !important;
  line-height: 1.5 !important;
}

.src-result-panel {
  display: none !important;
  text-align: center !important;
  background: #fff !important;
  border: 3px solid var(--src-accent) !important;
  border-radius: 20px !important;
  padding: 12px 16px !important;
  margin: 10px 0 !important;
  box-shadow: inset 0 2px 8px rgba(212,175,55,0.08) !important;
}

.src-result-panel.src-result-visible {
  display: block !important;
  animation: src-pop 0.45s cubic-bezier(0.34,1.56,0.64,1) both !important;
}

@keyframes src-pop {
  from { transform: scale(0.88); opacity: 0; }
  to { transform: scale(1); opacity: 1; }
}

.src-result-label {
  color: var(--src-main) !important;
  font-weight: 900 !important;
  font-size: 0.95rem !important;
}

.src-result-value {
  font-family: "Courier New", monospace !important;
  color: var(--src-main) !important;
  font-size: clamp(2.1rem, 8vw, 4.3rem) !important;
  font-weight: 900 !important;
  line-height: 1.05 !important;
  letter-spacing: 0.03em !important;
  background: linear-gradient(135deg, var(--src-main), var(--src-main-light), var(--src-accent)) !important;
  -webkit-background-clip: text !important;
  background-clip: text !important;
  -webkit-text-fill-color: transparent !important;
}

.src-action-row,
.src-prac-input-row {
  display: flex !important;
  justify-content: center !important;
  align-items: center !important;
  gap: 10px !important;
  flex-wrap: wrap !important;
  margin-top: 10px !important;
}

.src-btn-primary,
.src-btn-secondary,
.src-btn-outline,
.src-btn-ghost,
.src-prac-settings-btn {
  border-radius: 14px !important;
  padding: 12px 22px !important;
  font-size: clamp(0.95rem, 2.4vw, 1.05rem) !important;
  font-weight: 900 !important;
  cursor: pointer !important;
  transition: all 0.18s !important;
  border: none !important;
}

.src-btn-primary {
  background: linear-gradient(135deg, var(--src-main-light) 0%, var(--src-main) 100%) !important;
  color: #fff !important;
  box-shadow: 0 4px 12px rgba(30,58,95,0.3) !important;
}

.src-btn-secondary {
  background: linear-gradient(135deg, var(--src-accent-light) 0%, var(--src-accent) 100%) !important;
  color: var(--src-main-dark) !important;
  box-shadow: 0 4px 12px rgba(212,175,55,0.3) !important;
}

.src-btn-outline,
.src-prac-settings-btn {
  background: #fff !important;
  color: var(--src-main) !important;
  border: 2px solid var(--src-main) !important;
}

.src-btn-ghost {
  background: #f1f5f9 !important;
  color: #475569 !important;
  border: 2px solid #cbd5e1 !important;
}

.src-btn-primary:hover,
.src-btn-secondary:hover,
.src-btn-outline:hover,
.src-btn-ghost:hover,
.src-prac-settings-btn:hover {
  transform: translateY(-2px) !important;
  box-shadow: var(--src-shadow-hover) !important;
}

.src-btn-primary:disabled,
.src-btn-outline:disabled {
  opacity: 0.45 !important;
  cursor: default !important;
  transform: none !important;
  box-shadow: none !important;
}

/* Practice */
.src-practice-area {
  max-width: 760px !important;
}

.src-prac-topbar {
  display: flex !important;
  align-items: center !important;
  gap: 10px !important;
  padding: 8px 0 10px !important;
}

.src-prac-badges {
  flex: 1 !important;
  display: flex !important;
  gap: 6px !important;
  flex-wrap: wrap !important;
}

.src-prac-badge {
  background: var(--src-main) !important;
  color: #fff !important;
  border-radius: 999px !important;
  padding: 4px 12px !important;
  font-size: 0.82rem !important;
  font-weight: 900 !important;
}

.src-prac-badge-gold {
  background: var(--src-accent) !important;
  color: #1a1a1a !important;
}

.src-prac-score {
  color: var(--src-main) !important;
  font-size: 1rem !important;
  font-weight: 900 !important;
  white-space: nowrap !important;
}

.src-prac-question-card {
  background: #fff !important;
  border: 3px solid var(--src-main) !important;
  border-radius: 18px !important;
  padding: clamp(18px, 4vw, 34px) 14px !important;
  text-align: center !important;
  margin: 8px 0 14px !important;
  overflow: hidden !important;
}

.src-prac-question {
  color: var(--src-main) !important;
  font-size: clamp(1.4rem, 5vw, 2.7rem) !important;
  font-weight: 900 !important;
  line-height: 1.3 !important;
}

.src-prac-answer {
  max-width: 320px !important;
  font-family: "Courier New", monospace !important;
  font-size: clamp(1.4rem, 4vw, 2rem) !important;
  text-align: center !important;
  padding: 12px 14px !important;
}

.src-prac-feedback {
  min-height: 2.2rem !important;
  margin: 12px 0 6px !important;
  display: flex !important;
  align-items: center !important;
  justify-content: center !important;
  text-align: center !important;
  font-size: clamp(1.1rem, 3vw, 1.45rem) !important;
  font-weight: 900 !important;
}

.src-prac-feedback.src-correct { color: var(--src-success) !important; }
.src-prac-feedback.src-wrong { color: var(--src-danger) !important; }

.src-prac-explain-wrap {
  text-align: center !important;
  margin-top: 8px !important;
}

.src-prac-mini-board {
  margin-top: 12px !important;
  border: 3px solid #000 !important;
  border-radius: 16px !important;
  padding: 14px 8px !important;
  overflow-x: auto !important;
  background: #fff !important;
}

.src-digit-row-mini .src-digit-cell {
  width: clamp(46px, 8vw, 78px) !important;
  min-width: clamp(46px, 8vw, 78px) !important;
  height: clamp(58px, 10vw, 88px) !important;
}

.src-digit-row-mini .src-digit-card {
  font-size: clamp(1.6rem, 5.5vw, 2.8rem) !important;
  border-radius: 12px !important;
}

.src-prac-explanation {
  color: var(--src-main) !important;
  background: #f1f5f9 !important;
  border-radius: 12px !important;
  padding: 10px 12px !important;
  margin-top: 10px !important;
  font-weight: 900 !important;
  line-height: 1.5 !important;
}

/* Rule */
.src-rule-area {
  max-width: 960px !important;
}

.src-rule-card {
  background: #f8fafc !important;
  border: 2px solid #e2e8f0 !important;
  border-radius: 18px !important;
  padding: 18px !important;
}

.src-rule-card h2 {
  color: var(--src-main) !important;
  font-size: clamp(1.2rem, 3vw, 1.6rem) !important;
  font-weight: 900 !important;
  margin: 0 0 12px !important;
}

.src-rule-card ol {
  margin: 0 !important;
  padding-left: 1.4em !important;
}

.src-rule-card li {
  font-size: clamp(1rem, 2.5vw, 1.15rem) !important;
  font-weight: 800 !important;
  line-height: 1.7 !important;
  margin: 4px 0 !important;
}

.src-rule-examples {
  display: grid !important;
  grid-template-columns: repeat(2, 1fr) !important;
  gap: 12px !important;
  margin-top: 12px !important;
}

.src-example-card {
  border: 2px solid var(--src-border) !important;
  border-radius: 18px !important;
  padding: 16px !important;
  text-align: center !important;
  background: #fff !important;
  box-shadow: var(--src-shadow) !important;
}

.src-example-title {
  display: inline-block !important;
  background: var(--src-main) !important;
  color: #fff !important;
  border-radius: 999px !important;
  padding: 4px 12px !important;
  font-weight: 900 !important;
}

.src-example-number {
  font-family: "Courier New", monospace !important;
  font-size: clamp(1.8rem, 5vw, 3rem) !important;
  font-weight: 900 !important;
  color: #000 !important;
  margin-top: 12px !important;
}

.src-example-answer {
  color: var(--src-main) !important;
  font-size: clamp(1.5rem, 4vw, 2.4rem) !important;
  font-weight: 900 !important;
}

.src-example-card p {
  color: var(--src-text) !important;
  font-weight: 800 !important;
  margin: 8px 0 0 !important;
  line-height: 1.5 !important;
}

/* Confetti */
.src-prac-confetti {
  display: none !important;
  position: fixed !important;
  inset: 0 !important;
  z-index: 9999 !important;
  pointer-events: none !important;
  overflow: hidden !important;
}

.src-prac-confetti.src-confetti-active {
  display: block !important;
}

.src-confetti-piece {
  position: absolute !important;
  top: -16px !important;
  animation: src-confetti-fall linear forwards !important;
}

@keyframes src-confetti-fall {
  0% { transform: translateY(0) rotate(0deg); opacity: 1; }
  100% { transform: translateY(105vh) rotate(720deg); opacity: 0; }
}

.src-clear-message {
  position: absolute !important;
  top: 50% !important;
  left: 50% !important;
  transform: translate(-50%, -50%) !important;
  background: rgba(10,20,40,0.84) !important;
  backdrop-filter: blur(6px) !important;
  -webkit-backdrop-filter: blur(6px) !important;
  border: 3px solid var(--src-accent) !important;
  border-radius: 24px !important;
  padding: 28px 40px !important;
  box-shadow: 0 0 0 6px rgba(212,175,55,0.2), 0 20px 60px rgba(0,0,0,0.6) !important;
  width: max-content !important;
  max-width: 90vw !important;
  min-width: 0 !important;
  text-align: center !important;
  white-space: nowrap !important;
  animation: src-clear-pop 0.6s cubic-bezier(0.34,1.56,0.64,1) both !important;
}

@keyframes src-clear-pop {
  from { transform: translate(-50%, -50%) scale(0.3); opacity: 0; }
  to { transform: translate(-50%, -50%) scale(1); opacity: 1; }
}

.src-clear-title {
  font-size: clamp(2.2rem, 7vw, 4rem) !important;
  font-weight: 900 !important;
  color: var(--src-accent) !important;
  text-shadow: 0 2px 8px rgba(0,0,0,0.5) !important;
}

.src-clear-sub {
  font-size: clamp(1.2rem, 4vw, 2rem) !important;
  font-weight: 900 !important;
  color: #fff !important;
  margin-top: 8px !important;
}

@media (max-width: 900px) {
  .src-settings-panel {
    grid-template-columns: 1fr !important;
  }

  .src-rule-examples {
    grid-template-columns: 1fr !important;
  }
}

@media (max-width: 560px) {
  .src-main-tabs {
    gap: 4px !important;
    padding-left: 8px !important;
    padding-right: 8px !important;
  }

  .src-main-tab-btn {
    padding: 9px 10px !important;
    flex: 1 !important;
  }

  .src-board {
    min-height: 176px !important;
    padding-left: 4px !important;
    padding-right: 4px !important;
  }

  .src-prac-topbar {
    align-items: flex-start !important;
    flex-wrap: wrap !important;
  }

  .src-prac-input-row .src-btn-primary,
  .src-prac-answer {
    width: 100% !important;
    max-width: 100% !important;
  }

  .src-action-row button {
    flex: 1 1 44% !important;
  }
}