/* ==========================================
   ゆっくり解説！小数スナイパー
   Prefix: sds-
   ========================================== */

.sds-wrapper {
  --sds-base: #ffffff;
  --sds-base-light: #fafafa;
  --sds-base-dark: #f5f5f5;
  --sds-main: #1e3a5f;
  --sds-main-light: #2d5a8f;
  --sds-main-dark: #0f1e3a;
  --sds-accent: #d4af37;
  --sds-accent-light: #f4cf5f;
  --sds-accent-dark: #b8941f;
  --sds-text: #2c3e50;
  --sds-text-light: #64748b;
  --sds-border: #e8e8e8;
  --sds-success: #10b981;
  --sds-danger: #ef4444;
  --sds-warning: #f59e0b;
  --sds-shadow: 0 4px 20px rgba(30, 58, 95, 0.1);
  --sds-shadow-hover: 0 8px 30px rgba(30, 58, 95, 0.16);
  --sds-digit-size: clamp(2.1rem, 7vw, 4.4rem);
  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(--sds-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: 0 0 22px 22px !important;
  overflow: hidden !important;
}

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

.sds-header {
  width: 100% !important;
  background: var(--sds-main) !important;
  border-top: 3px solid var(--sds-accent) !important;
  border-bottom: 3px solid var(--sds-accent) !important;
  padding: clamp(14px, 2.4vw, 24px) 16px !important;
  text-align: center !important;
  color: #fff !important;
  box-shadow: 0 4px 20px rgba(30,58,95,0.28) !important;
  position: relative !important;
  overflow: hidden !important;
}

.sds-header::before {
  content: '' !important;
  position: absolute !important;
  inset: 0 auto 0 -120% !important;
  width: 80% !important;
  background: linear-gradient(90deg, transparent, rgba(212,175,55,0.18), transparent) !important;
  animation: sds-shine 4s linear infinite !important;
}

@keyframes sds-shine {
  from { transform: translateX(0); }
  to { transform: translateX(280%); }
}

.sds-header h1 {
  margin: 0 !important;
  padding: 0 !important;
  font-size: clamp(1.35rem, 4vw, 2rem) !important;
  font-weight: 900 !important;
  color: #fff !important;
  line-height: 1.25 !important;
  position: relative !important;
}

.sds-header p {
  margin: 8px 0 0 !important;
  color: rgba(255,255,255,0.86) !important;
  font-size: clamp(0.85rem, 2vw, 1rem) !important;
  font-weight: 700 !important;
  position: relative !important;
}

.sds-main-tabs {
  display: flex !important;
  gap: 8px !important;
  padding: 14px 16px 0 !important;
  border-bottom: 3px solid var(--sds-accent) !important;
  background: var(--sds-main) !important;
  overflow-x: auto !important;
}

.sds-main-tab-btn {
  padding: 10px 22px !important;
  border: none !important;
  border-radius: 10px 10px 0 0 !important;
  font-size: clamp(0.88rem, 2vw, 1rem) !important;
  font-weight: 900 !important;
  cursor: pointer !important;
  background: rgba(255,255,255,0.16) !important;
  color: rgba(255,255,255,0.78) !important;
  transition: all 0.2s !important;
  white-space: nowrap !important;
}

.sds-main-tab-btn.sds-main-tab-active {
  background: #fff !important;
  color: var(--sds-main) !important;
}

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

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

.sds-app-area,
.sds-sniper-area,
.sds-practice-area,
.sds-rule-area {
  width: 98% !important;
  max-width: 980px !important;
  margin: 18px auto !important;
  padding: clamp(10px, 2vw, 18px) !important;
  background: var(--sds-base) !important;
  border: 2px solid var(--sds-border) !important;
  border-radius: 24px !important;
  box-shadow: var(--sds-shadow) !important;
  position: relative !important;
}

.sds-settings-panel {
  display: grid !important;
  grid-template-columns: minmax(210px, 0.8fr) minmax(280px, 1.2fr) !important;
  gap: 12px !important;
  align-items: stretch !important;
  margin-bottom: 14px !important;
}

.sds-field {
  background: #f8fafc !important;
  border: 1px solid #e2e8f0 !important;
  border-radius: 18px !important;
  padding: 12px !important;
}

.sds-field label,
.sds-label-text {
  display: block !important;
  margin: 0 0 8px !important;
  font-size: 0.88rem !important;
  font-weight: 900 !important;
  color: var(--sds-main) !important;
}

.sds-number-input,
.sds-prac-answer {
  width: 100% !important;
  border: 3px solid var(--sds-main) !important;
  border-radius: 14px !important;
  padding: 10px 12px !important;
  font-size: clamp(1.4rem, 4vw, 2rem) !important;
  font-weight: 900 !important;
  color: var(--sds-main) !important;
  background: #fff !important;
  text-align: center !important;
  outline: none !important;
  font-family: "Courier New", monospace !important;
}

.sds-number-input:focus,
.sds-prac-answer:focus {
  border-color: var(--sds-accent) !important;
  box-shadow: 0 0 0 5px rgba(212,175,55,0.18) !important;
}

.sds-help-text {
  margin-top: 7px !important;
  color: var(--sds-text-light) !important;
  font-size: 0.78rem !important;
  font-weight: 700 !important;
}

.sds-chip-row {
  display: grid !important;
  grid-template-columns: repeat(6, minmax(64px, 1fr)) !important;
  gap: 8px !important;
}

.sds-chip {
  border: 2px solid var(--sds-main) !important;
  background: #fff !important;
  color: var(--sds-main) !important;
  border-radius: 16px !important;
  padding: 10px 8px !important;
  font-weight: 900 !important;
  font-size: clamp(0.92rem, 2.3vw, 1.18rem) !important;
  cursor: pointer !important;
  transition: all 0.16s !important;
}

.sds-chip:hover {
  border-color: var(--sds-accent) !important;
  transform: translateY(-2px) !important;
}

.sds-chip.sds-chip-active {
  background: var(--sds-main) !important;
  color: var(--sds-accent) !important;
  box-shadow: 0 8px 20px rgba(30,58,95,0.28) !important;
}

.sds-mission-card {
  background: #fff !important;
  border: 3px solid var(--sds-accent) !important;
  border-radius: 20px !important;
  padding: 14px 16px !important;
  text-align: center !important;
  margin: 12px 0 !important;
  box-shadow: inset 0 0 0 5px rgba(30,58,95,0.04) !important;
}

.sds-mission-label {
  display: inline-block !important;
  background: var(--sds-main) !important;
  color: #fff !important;
  border-radius: 999px !important;
  padding: 4px 14px !important;
  font-size: 0.78rem !important;
  font-weight: 900 !important;
  letter-spacing: 0.05em !important;
}

.sds-mission-text {
  margin-top: 8px !important;
  color: var(--sds-main) !important;
  font-size: clamp(1.6rem, 6vw, 3rem) !important;
  font-weight: 900 !important;
  line-height: 1.1 !important;
  white-space: nowrap !important;
  overflow: hidden !important;
  text-overflow: ellipsis !important;
}

.sds-board {
  width: 100% !important;
  min-height: 180px !important;
  background: #fff !important;
  border: 4px solid #111827 !important;
  border-radius: 18px !important;
  overflow-x: auto !important;
  overflow-y: hidden !important;
  padding: 0 12px 18px !important;
  position: relative !important;
}

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

.sds-place-row {
  background: #f1f5f9 !important;
  border-bottom: 2px solid #111827 !important;
  margin: 0 -12px 8px !important;
  padding: 8px 12px !important;
}

.sds-place-cell,
.sds-gap-label {
  width: clamp(42px, 10vw, 82px) !important;
  flex: 0 0 clamp(42px, 10vw, 82px) !important;
  text-align: center !important;
  color: var(--sds-main) !important;
  font-weight: 900 !important;
  font-size: clamp(0.68rem, 1.8vw, 0.9rem) !important;
  line-height: 1.2 !important;
}

.sds-gap-label {
  width: clamp(26px, 5vw, 44px) !important;
  flex-basis: clamp(26px, 5vw, 44px) !important;
  color: transparent !important;
}

.sds-digit-row {
  padding-top: 12px !important;
  align-items: center !important;
}

.sds-digit-card {
  width: clamp(42px, 10vw, 82px) !important;
  height: clamp(58px, 14vw, 100px) !important;
  border: 3px solid var(--sds-main) !important;
  border-radius: 14px !important;
  background: #fff !important;
  display: flex !important;
  align-items: center !important;
  justify-content: center !important;
  font-family: "Courier New", monospace !important;
  font-size: var(--sds-digit-size) !important;
  font-weight: 900 !important;
  color: #111827 !important;
  box-shadow: 0 4px 10px rgba(0,0,0,0.08) !important;
  position: relative !important;
}

.sds-digit-card.sds-zero-added {
  background: #fff7ed !important;
  border-color: var(--sds-warning) !important;
}

.sds-gap {
  width: clamp(26px, 5vw, 44px) !important;
  height: clamp(58px, 14vw, 100px) !important;
  display: flex !important;
  align-items: center !important;
  justify-content: center !important;
  flex-shrink: 0 !important;
  position: relative !important;
}

.sds-decimal-dot {
  width: clamp(13px, 3vw, 20px) !important;
  height: clamp(13px, 3vw, 20px) !important;
  border-radius: 50% !important;
  background: var(--sds-danger) !important;
  box-shadow: 0 0 0 5px #fff, 0 0 20px rgba(239,68,68,0.55) !important;
  animation: sds-dot-pop 0.38s cubic-bezier(0.34,1.56,0.64,1) both !important;
}

.sds-decimal-dot.sds-target-dot {
  background: var(--sds-success) !important;
  box-shadow: 0 0 0 5px #fff, 0 0 24px rgba(16,185,129,0.65) !important;
}

@keyframes sds-dot-pop {
  from { transform: scale(0.2); opacity: 0; }
  to { transform: scale(1); opacity: 1; }
}

.sds-clickable-row .sds-gap {
  cursor: crosshair !important;
}

.sds-clickable-row .sds-gap::before {
  content: '' !important;
  width: 26px !important;
  height: 26px !important;
  border: 3px solid var(--sds-accent) !important;
  border-radius: 50% !important;
  opacity: 0 !important;
  background: rgba(255,255,255,0.92) !important;
  transition: all 0.15s !important;
  position: absolute !important;
}

.sds-clickable-row .sds-gap:hover::before {
  opacity: 1 !important;
  transform: scale(1.2) !important;
}

.sds-gap.sds-gap-correct::before {
  opacity: 1 !important;
  background: var(--sds-success) !important;
  border-color: var(--sds-success) !important;
  box-shadow: 0 0 20px rgba(16,185,129,0.5) !important;
}

.sds-gap.sds-gap-wrong::before {
  opacity: 1 !important;
  background: var(--sds-danger) !important;
  border-color: var(--sds-danger) !important;
}

.sds-step-panel {
  margin: 14px 0 10px !important;
  background: #f8fafc !important;
  border: 2px solid #e2e8f0 !important;
  border-radius: 18px !important;
  padding: 14px 16px !important;
  text-align: center !important;
  min-height: 116px !important;
}

.sds-step-badge {
  display: inline-block !important;
  background: var(--sds-main) !important;
  color: var(--sds-accent) !important;
  border-radius: 999px !important;
  padding: 4px 14px !important;
  font-size: 0.82rem !important;
  font-weight: 900 !important;
}

.sds-step-title {
  margin-top: 8px !important;
  color: var(--sds-main) !important;
  font-size: clamp(1.2rem, 3.5vw, 1.7rem) !important;
  font-weight: 900 !important;
}

.sds-step-message {
  margin-top: 5px !important;
  color: var(--sds-text) !important;
  font-size: clamp(0.95rem, 2.4vw, 1.12rem) !important;
  font-weight: 800 !important;
  line-height: 1.55 !important;
}

.sds-result-panel {
  display: none !important;
  background: var(--sds-main) !important;
  border: 3px solid var(--sds-accent) !important;
  border-radius: 20px !important;
  padding: 14px !important;
  text-align: center !important;
  color: #fff !important;
  margin: 10px 0 !important;
}

.sds-result-panel.sds-result-visible {
  display: block !important;
  animation: sds-pop 0.35s cubic-bezier(0.34,1.56,0.64,1) both !important;
}

@keyframes sds-pop {
  from { transform: scale(0.92); opacity: 0; }
  to { transform: scale(1); opacity: 1; }
}

.sds-result-label {
  font-size: 0.85rem !important;
  color: rgba(255,255,255,0.75) !important;
  font-weight: 900 !important;
}

.sds-result-value {
  margin-top: 4px !important;
  font-size: clamp(2rem, 8vw, 4rem) !important;
  color: var(--sds-accent) !important;
  font-weight: 900 !important;
  font-family: "Courier New", monospace !important;
  line-height: 1 !important;
}

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

.sds-btn-primary,
.sds-btn-secondary,
.sds-btn-outline,
.sds-btn-ghost,
.sds-prac-settings-btn {
  border-radius: 14px !important;
  padding: 12px 22px !important;
  font-size: 1rem !important;
  font-weight: 900 !important;
  cursor: pointer !important;
  transition: all 0.18s !important;
  border: none !important;
}

.sds-btn-primary {
  background: linear-gradient(135deg, var(--sds-main-light), var(--sds-main)) !important;
  color: #fff !important;
  box-shadow: 0 4px 12px rgba(30,58,95,0.28) !important;
}

.sds-btn-secondary {
  background: linear-gradient(135deg, var(--sds-accent-light), var(--sds-accent)) !important;
  color: var(--sds-main-dark) !important;
  box-shadow: 0 4px 12px rgba(212,175,55,0.28) !important;
}

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

.sds-btn-ghost {
  background: #f1f5f9 !important;
  color: #64748b !important;
  border: 2px solid #cbd5e1 !important;
}

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

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

.sds-sniper-topbar,
.sds-prac-topbar {
  display: flex !important;
  align-items: center !important;
  justify-content: space-between !important;
  gap: 10px !important;
  margin-bottom: 10px !important;
}

.sds-prac-badges {
  display: flex !important;
  gap: 8px !important;
  flex-wrap: wrap !important;
  justify-content: flex-end !important;
}

.sds-prac-badge {
  background: var(--sds-main) !important;
  color: #fff !important;
  font-size: 0.86rem !important;
  font-weight: 900 !important;
  padding: 5px 12px !important;
  border-radius: 999px !important;
  white-space: nowrap !important;
}

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

.sds-controls-area {
  min-height: 54px !important;
  display: flex !important;
  align-items: center !important;
  justify-content: center !important;
}

.sds-feedback,
.sds-prac-feedback {
  min-height: 2.1rem !important;
  display: flex !important;
  justify-content: center !important;
  align-items: center !important;
  font-size: clamp(1.05rem, 3vw, 1.35rem) !important;
  font-weight: 900 !important;
  text-align: center !important;
  color: var(--sds-main) !important;
  margin: 8px 0 !important;
}

.sds-feedback.sds-correct,
.sds-prac-feedback.sds-correct {
  color: var(--sds-success) !important;
}

.sds-feedback.sds-wrong,
.sds-prac-feedback.sds-wrong {
  color: var(--sds-danger) !important;
}

.sds-prac-question-card {
  background: #fff !important;
  border: 3px solid var(--sds-main) !important;
  border-radius: 18px !important;
  margin: 14px 0 !important;
  padding: clamp(20px, 4vw, 34px) 16px !important;
  text-align: center !important;
  overflow: hidden !important;
}

.sds-prac-question {
  font-size: clamp(1.7rem, 6vw, 3.6rem) !important;
  font-weight: 900 !important;
  color: var(--sds-main) !important;
  white-space: nowrap !important;
  font-family: "Courier New", "Noto Sans JP", sans-serif !important;
}

.sds-prac-answer {
  max-width: 260px !important;
}

.sds-prac-explain-wrap {
  text-align: center !important;
  margin-top: 10px !important;
}

.sds-prac-mini-board {
  margin-top: 12px !important;
  padding: 12px !important;
  border: 2px solid #e2e8f0 !important;
  border-radius: 18px !important;
  background: #f8fafc !important;
  overflow-x: auto !important;
}

.sds-digit-row-mini {
  padding-top: 0 !important;
}

.sds-digit-row-mini .sds-digit-card {
  width: clamp(34px, 8vw, 56px) !important;
  height: clamp(44px, 10vw, 70px) !important;
  font-size: clamp(1.6rem, 5vw, 2.8rem) !important;
}

.sds-digit-row-mini .sds-gap {
  width: clamp(20px, 4vw, 34px) !important;
  height: clamp(44px, 10vw, 70px) !important;
}

.sds-prac-explanation {
  margin-top: 8px !important;
  color: var(--sds-main) !important;
  font-size: 1rem !important;
  font-weight: 900 !important;
}

.sds-rule-area {
  display: grid !important;
  grid-template-columns: 1fr 1fr !important;
  gap: 14px !important;
}

.sds-rule-card,
.sds-example-card {
  background: #fff !important;
  border: 2px solid var(--sds-border) !important;
  border-radius: 20px !important;
  padding: 18px !important;
  box-shadow: var(--sds-shadow) !important;
  position: relative !important;
  overflow: hidden !important;
}

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

.sds-rule-card h2 {
  margin: 0 0 10px !important;
  color: var(--sds-main) !important;
  font-size: 1.35rem !important;
  font-weight: 900 !important;
}

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

.sds-rule-card li {
  margin: 8px 0 !important;
  color: var(--sds-text) !important;
  font-weight: 800 !important;
  line-height: 1.55 !important;
}

.sds-rule-examples {
  display: grid !important;
  gap: 14px !important;
}

.sds-example-title {
  color: var(--sds-main) !important;
  font-weight: 900 !important;
  font-size: 1rem !important;
}

.sds-example-number {
  margin: 8px 0 !important;
  color: var(--sds-main) !important;
  font-family: "Courier New", monospace !important;
  font-weight: 900 !important;
  font-size: clamp(1.4rem, 4vw, 2rem) !important;
}

.sds-example-card p {
  margin: 0 !important;
  color: var(--sds-text-light) !important;
  font-weight: 800 !important;
}

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

.sds-shake {
  animation: sds-shake 0.4s cubic-bezier(.36,.07,.19,.97) both !important;
}

@keyframes sds-shake {
  10%, 90% { transform: translate3d(-5px, 0, 0); }
  20%, 80% { transform: translate3d(10px, 0, 0); }
  30%, 50%, 70% { transform: translate3d(-8px, 0, 0); }
  40%, 60% { transform: translate3d(8px, 0, 0); }
}

.sds-prac-confetti,
.sds-sniper-confetti {
  display: none !important;
  position: fixed !important;
  inset: 0 !important;
  z-index: 9999 !important;
  pointer-events: none !important;
  overflow: hidden !important;
}

.sds-prac-confetti.sds-confetti-active,
.sds-sniper-confetti.sds-confetti-active {
  display: block !important;
}

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

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

.sds-clear-message {
  position: absolute !important;
  top: 50% !important;
  left: 50% !important;
  transform: translate(-50%, -50%) !important;
  background: rgba(10, 20, 40, 0.82) !important;
  backdrop-filter: blur(6px) !important;
  -webkit-backdrop-filter: blur(6px) !important;
  border: 3px solid var(--sds-accent, #d4af37) !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;
  white-space: nowrap !important;
  text-align: center !important;
  animation: sds-clear-pop 0.6s cubic-bezier(0.34,1.56,0.64,1) both !important;
}

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

.sds-clear-title {
  font-size: clamp(2rem, 8vw, 3.5rem) !important;
  font-weight: 900 !important;
  color: #d4af37 !important;
  text-shadow: 0 2px 8px rgba(0,0,0,0.5) !important;
}

.sds-clear-sub {
  font-size: clamp(1.2rem, 4.6vw, 1.8rem) !important;
  font-weight: 900 !important;
  color: #fff !important;
  margin-top: 8px !important;
  text-shadow: 0 1px 4px rgba(0,0,0,0.6) !important;
}

@media (max-width: 760px) {
  .sds-settings-panel,
  .sds-rule-area {
    grid-template-columns: 1fr !important;
  }
  .sds-chip-row {
    grid-template-columns: repeat(3, minmax(74px, 1fr)) !important;
  }
  .sds-sniper-topbar,
  .sds-prac-topbar {
    align-items: flex-start !important;
    flex-direction: column !important;
  }
  .sds-prac-badges {
    justify-content: flex-start !important;
  }
}

@media (max-width: 460px) {
  .sds-main-tab-btn {
    padding: 9px 14px !important;
  }
  .sds-action-row .sds-btn-primary,
  .sds-action-row .sds-btn-secondary,
  .sds-action-row .sds-btn-outline,
  .sds-action-row .sds-btn-ghost {
    flex: 1 1 42% !important;
    padding: 10px 12px !important;
  }
}