:root {
  --ets-navy: #0e2a47;
  --ets-blue: #1a568c;
  --ets-light-blue: #eef4f9;
  --ets-border: #cbd5e1;
  --ets-bg: #f8fafc;
  --ets-text: #1e293b;
  --ets-text-muted: #64748b;
  --ets-accent: #059669;
  --ets-danger: #dc2626;
  --ets-warning: #d97706;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family:
    -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue",
    Arial, sans-serif;
  background-color: var(--ets-bg);
  color: var(--ets-text);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.ets-header {
  background-color: var(--ets-navy);
  color: #fff;
  padding: 0.75rem 1.5rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.header-left {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.toefl-logo {
  font-weight: 800;
  letter-spacing: 0.05em;
  font-size: 1.15rem;
}

.divider {
  color: #64748b;
}
.section-title {
  font-size: 0.95rem;
  font-weight: 500;
  color: #e2e8f0;
}

.header-right {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.timer-box {
  background: rgba(255, 255, 255, 0.12);
  padding: 0.3rem 0.75rem;
  border-radius: 4px;
  font-family: monospace;
  font-size: 1rem;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.header-actions {
  display: flex;
  gap: 0.5rem;
}

.header-btn {
  background: rgba(255, 255, 255, 0.1);
  border: 1px solid rgba(255, 255, 255, 0.2);
  color: #fff;
  padding: 0.35rem 0.7rem;
  border-radius: 4px;
  font-size: 0.8rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.15s ease;
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
}

.header-btn:hover {
  background: rgba(255, 255, 255, 0.22);
}

.ets-subbar {
  background-color: #ffffff;
  border-bottom: 1px solid var(--ets-border);
  padding: 0.5rem 1.5rem;
}

.subbar-content {
  max-width: 960px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.subbar-left {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.question-progress {
  font-weight: 700;
  font-size: 0.9rem;
  color: var(--ets-navy);
}

.meta-tag {
  background-color: var(--ets-light-blue);
  color: var(--ets-blue);
  font-size: 0.75rem;
  font-weight: 600;
  padding: 0.2rem 0.5rem;
  border-radius: 3px;
}

.skill-badge {
  background-color: #f3e8ff;
  color: #7e22ce;
}

.filter-controls {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  flex-wrap: wrap;
}

.filter-group {
  display: flex;
  align-items: center;
  gap: 0.3rem;
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--ets-text-muted);
}

.filter-select {
  background: #f8fafc;
  border: 1px solid var(--ets-border);
  border-radius: 4px;
  padding: 0.25rem 0.45rem;
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--ets-navy);
  outline: none;
  cursor: pointer;
  transition: border-color 0.15s;
}

.filter-select.select-mini {
  padding: 0.25rem 0.35rem;
  min-width: 48px;
}

.filter-select:hover,
.filter-select:focus {
  border-color: var(--ets-blue);
}

.test-container {
  flex: 1;
  max-width: 900px;
  width: 100%;
  margin: 0 auto;
  padding: 1.5rem 1rem;
  display: flex;
  flex-direction: column;
}

.task-instructions {
  font-size: 0.9rem;
  color: var(--ets-text-muted);
  margin-bottom: 1.25rem;
  border-left: 3px solid var(--ets-blue);
  padding-left: 0.75rem;
}

.prompt-section {
  background-color: #fff;
  border: 1px solid var(--ets-border);
  border-radius: 6px;
  padding: 1rem 1.25rem;
  margin-bottom: 1.5rem;
}

.prompt-label {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  font-weight: 700;
  color: var(--ets-blue);
  margin-bottom: 0.4rem;
}

.prompt-content {
  font-size: 1.15rem;
  font-weight: 500;
  line-height: 1.5;
  color: #0f172a;
}

.answer-section,
.wordbank-section {
  margin-bottom: 1.5rem;
}

.section-sublabel {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--ets-text-muted);
  margin-bottom: 0.5rem;
}

.sentence-builder-wrapper {
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

.slots-container {
  flex: 1;
  min-height: 80px;
  background-color: #ffffff;
  border: 2px solid #cbd5e1;
  border-radius: 6px;
  padding: 0.75rem;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.6rem;
}

.fixed-period {
  font-size: 2.2rem;
  font-weight: 800;
  color: var(--ets-navy);
  line-height: 1;
  align-self: flex-end;
  margin-bottom: 0.5rem;
  user-select: none;
}

.wordbank-container {
  min-height: 80px;
  background-color: #f1f5f9;
  border: 1.5px dashed var(--ets-border);
  border-radius: 6px;
  padding: 0.75rem;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.6rem;
  transition:
    border-color 0.15s,
    background-color 0.15s;
}

.wordbank-container.drag-over {
  border-color: var(--ets-blue) !important;
  background-color: #f0f7ff !important;
}

.slot-placeholder {
  min-width: 84px;
  height: 40px;
  border: 1.5px dashed #94a3b8;
  border-radius: 4px;
  background-color: #f8fafc;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: #94a3b8;
  font-size: 0.8rem;
  font-weight: 600;
  padding: 0 0.75rem;
  user-select: none;
  transition: all 0.15s ease;
  cursor: pointer;
}

.slot-placeholder.drag-target {
  border-color: var(--ets-blue);
  background-color: #e0f2fe;
  color: var(--ets-blue);
  transform: scale(1.04);
}

.word-chip {
  height: 40px;
  cursor: grab;
  padding: 0 1rem;
  font-size: 0.95rem;
  font-weight: 500;
  border-radius: 4px;
  border: 1px solid #94a3b8;
  background: #ffffff;
  color: #1e293b;
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.05);
  transition:
    transform 0.1s,
    opacity 0.1s;
  user-select: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.word-chip:active {
  cursor: grabbing;
}
.word-chip.dragging {
  opacity: 0.35;
  transform: scale(0.95);
}

.word-chip.drag-target {
  outline: 2.5px dashed var(--ets-blue);
  outline-offset: 2px;
  transform: translateY(-2px);
  background-color: #e0f2fe !important;
  color: #0369a1 !important;
}

.word-chip:hover {
  border-color: var(--ets-blue);
  background-color: #f8fafc;
}
.word-chip.placed {
  background-color: var(--ets-blue);
  border-color: var(--ets-navy);
  color: #ffffff;
}
.word-chip.placed:hover {
  background-color: #164670;
}

.feedback-panel {
  margin-top: 1rem;
  padding: 1rem 1.25rem;
  border-radius: 6px;
  font-size: 0.95rem;
}

.feedback-panel.correct {
  background-color: #ecfdf5;
  border: 1px solid #a7f3d0;
  color: #065f46;
}

.feedback-panel.incorrect {
  background-color: #fef2f2;
  border: 1px solid #fecaca;
  color: #991b1b;
}

.feedback-header {
  font-weight: 700;
  margin-bottom: 0.35rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.ets-footer {
  background-color: #ffffff;
  border-top: 1px solid var(--ets-border);
  padding: 0.75rem 1.5rem;
}

.footer-content {
  max-width: 900px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.nav-actions {
  display: flex;
  gap: 0.75rem;
}

.btn-ets {
  font-size: 0.85rem;
  font-weight: 600;
  padding: 0.6rem 1.2rem;
  border-radius: 4px;
  border: 1px solid transparent;
  cursor: pointer;
  transition: all 0.15s ease;
}

.btn-ets.primary {
  background-color: var(--ets-blue);
  color: #fff;
}
.btn-ets.primary:hover:not(:disabled) {
  background-color: var(--ets-navy);
}
.btn-ets.accent {
  background-color: var(--ets-accent);
  color: #fff;
}
.btn-ets.accent:hover {
  background-color: #047857;
}
.btn-ets.secondary {
  background-color: #fff;
  border-color: #cbd5e1;
  color: #475569;
}
.btn-ets.secondary:hover {
  background-color: #f1f5f9;
  border-color: #94a3b8;
}
.btn-ets:disabled {
  opacity: 0.45;
  cursor: not-allowed;
}

.hidden {
  display: none !important;
}
.state-container {
  text-align: center;
  padding: 4rem 1rem;
}
.spinner {
  width: 36px;
  height: 36px;
  border: 3px solid #cbd5e1;
  border-top-color: var(--ets-blue);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
  margin: 0 auto 1rem;
}
@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

/* モーダル */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(15, 23, 42, 0.6);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 100;
  padding: 1rem;
}

.modal-card {
  background: #fff;
  border-radius: 8px;
  max-width: 820px;
  width: 100%;
  max-height: 88vh;
  display: flex;
  flex-direction: column;
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.2);
}

.modal-card.modal-sm {
  max-width: 440px;
}

.modal-header {
  padding: 1rem 1.25rem;
  border-bottom: 1px solid var(--ets-border);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.modal-header h3 {
  font-size: 1.05rem;
  color: var(--ets-navy);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.modal-close {
  background: none;
  border: none;
  font-size: 1.5rem;
  line-height: 1;
  cursor: pointer;
  color: var(--ets-text-muted);
}
.modal-close:hover {
  color: var(--ets-text);
}

.modal-stats-bar {
  background: #f8fafc;
  border-bottom: 1px solid var(--ets-border);
  padding: 0.6rem 1.25rem;
  display: flex;
  gap: 1.5rem;
  font-size: 0.85rem;
  color: var(--ets-text-muted);
}

.modal-stats-bar strong {
  color: var(--ets-navy);
}

.modal-body {
  padding: 1.25rem;
  overflow-y: auto;
  flex: 1;
}

/* ★Skill統計スタイル */
.section-heading {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  margin-bottom: 0.75rem;
}

.section-heading h4 {
  font-size: 0.95rem;
  color: var(--ets-navy);
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.skill-stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 0.65rem;
}

.skill-card {
  border: 1px solid var(--ets-border);
  border-radius: 6px;
  padding: 0.75rem 0.85rem;
  background: #ffffff;
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.03);
}

.skill-card.weak {
  border-left: 3.5px solid var(--ets-danger);
  background: #fffafa;
}

.skill-card-top {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.skill-name {
  font-weight: 700;
  font-size: 0.85rem;
  color: var(--ets-navy);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  max-width: 140px;
}

.skill-accuracy {
  font-weight: 800;
  font-size: 0.85rem;
}

.skill-accuracy.low {
  color: var(--ets-danger);
}
.skill-accuracy.medium {
  color: var(--ets-warning);
}
.skill-accuracy.high {
  color: var(--ets-accent);
}

.progress-bar-bg {
  width: 100%;
  height: 6px;
  background: #e2e8f0;
  border-radius: 3px;
  overflow: hidden;
}

.progress-bar-fill {
  height: 100%;
  border-radius: 3px;
  transition: width 0.3s ease;
}

.skill-card-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.75rem;
  color: var(--ets-text-muted);
}

.btn-practice-skill {
  background: #f1f5f9;
  border: 1px solid #cbd5e1;
  color: var(--ets-blue);
  border-radius: 3px;
  padding: 0.2rem 0.5rem;
  font-size: 0.7rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.15s;
}

.btn-practice-skill:hover {
  background: var(--ets-blue);
  color: #ffffff;
  border-color: var(--ets-navy);
}

/* 履歴アイテム */
.history-item {
  border: 1px solid var(--ets-border);
  border-radius: 6px;
  padding: 0.85rem 1rem;
  margin-bottom: 0.75rem;
  background: #ffffff;
  font-size: 0.85rem;
}

.history-item.correct {
  border-left: 4px solid var(--ets-accent);
}
.history-item.incorrect {
  border-left: 4px solid var(--ets-danger);
}

.history-meta {
  display: flex;
  justify-content: space-between;
  color: var(--ets-text-muted);
  font-size: 0.75rem;
  margin-bottom: 0.4rem;
}

.history-prompt {
  font-weight: 600;
  color: #0f172a;
  margin-bottom: 0.4rem;
}

.diff-line {
  margin-top: 0.3rem;
  line-height: 1.4;
}

.diff-label {
  font-weight: 600;
  display: inline-block;
  min-width: 85px;
}

.diff-user.wrong {
  color: var(--ets-danger);
}
.diff-target {
  color: var(--ets-accent);
}

/* バックアップUI */
.backup-action-box {
  background: #f8fafc;
  border: 1px solid var(--ets-border);
  border-radius: 6px;
  padding: 0.85rem 1rem;
  margin-bottom: 0.85rem;
}

.backup-action-box h4 {
  font-size: 0.9rem;
  margin-bottom: 0.25rem;
  color: var(--ets-navy);
}

.backup-action-box.danger {
  border-color: #fecaca;
  background: #fef2f2;
}

.mt-4 {
  margin-top: 1.25rem;
}
.text-sm {
  font-size: 0.85rem;
}
.text-xs {
  font-size: 0.75rem;
}
.text-muted {
  color: var(--ets-text-muted);
}
.text-danger {
  color: var(--ets-danger) !important;
  border-color: #fca5a5 !important;
}
.text-amber {
  color: var(--ets-warning);
}
.w-full {
  width: 100%;
}