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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Noto Sans JP", sans-serif;
  font-size: 16px;
  line-height: 1.6;
  color: #333;
  background: #f0f4f8;
}

/* ===== Header ===== */
header {
  background: linear-gradient(135deg, #1a2a4a 0%, #2c4a7c 100%);
  color: white;
  padding: 1.5rem 1rem;
  text-align: center;
}

header h1 {
  font-size: 1.15rem;
  line-height: 1.4;
  font-weight: 700;
}

.subtitle {
  font-size: 0.875rem;
  opacity: 0.85;
  margin-top: 0.4rem;
}

/* ===== Main ===== */
main {
  max-width: 800px;
  margin: 0 auto;
  padding: 1rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

/* ===== Ad unit ===== */
.ad-unit {
  min-height: 90px;
  background: #e2e8f0;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #a0aec0;
  font-size: 0.75rem;
  border-radius: 6px;
}

/* ===== Tool section ===== */
.tool-section {
  background: white;
  border-radius: 12px;
  padding: 1.25rem 1rem;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
}

.section-header {
  margin-bottom: 1rem;
}

.section-title {
  font-size: 1rem;
  font-weight: 700;
  color: #1a2a4a;
}

.section-desc {
  font-size: 0.8rem;
  color: #64748b;
  margin-top: 0.2rem;
}

/* ===== Buttons ===== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 0.875rem;
  font-weight: 600;
  padding: 0.5rem 1rem;
  border-radius: 8px;
  border: none;
  cursor: pointer;
  min-height: 44px;
  transition: background 0.2s, opacity 0.2s;
}

.btn-preset {
  background: #eff6ff;
  color: #2c4a7c;
  border: 1.5px solid #bfdbfe;
}

.btn-preset:hover {
  background: #dbeafe;
}

.btn-secondary {
  background: #f1f5f9;
  color: #64748b;
  border: 1.5px solid #e2e8f0;
}

.btn-secondary:hover {
  background: #e2e8f0;
}

.btn-add {
  background: #f0fdf4;
  color: #16a34a;
  border: 1.5px dashed #86efac;
  width: 100%;
  margin-top: 0.75rem;
}

.btn-add:hover {
  background: #dcfce7;
}

.btn-add:disabled {
  opacity: 0.45;
  cursor: not-allowed;
}

.btn-delete {
  background: none;
  border: none;
  color: #ef4444;
  font-size: 1.1rem;
  cursor: pointer;
  padding: 0.25rem 0.5rem;
  min-height: 44px;
  min-width: 44px;
  border-radius: 6px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.btn-delete:hover {
  background: #fef2f2;
}

/* ===== Preset buttons ===== */
.preset-buttons {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

/* ===== Criteria & Options list ===== */
.criteria-item,
.option-item {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 0;
  border-bottom: 1px solid #f1f5f9;
}

.criteria-item:last-child,
.option-item:last-child {
  border-bottom: none;
}

.criteria-item .item-index,
.option-item .item-index {
  font-size: 0.75rem;
  font-weight: 700;
  color: #9ca3af;
  min-width: 1.5rem;
  text-align: center;
  flex-shrink: 0;
}

.input-name {
  flex: 1;
  padding: 0.55rem 0.65rem;
  font-size: 1rem;
  border: 1.5px solid #d1d5db;
  border-radius: 8px;
  background: #f9fafb;
  color: #111827;
  min-height: 44px;
  transition: border-color 0.2s;
}

.input-name:focus {
  outline: none;
  border-color: #2c4a7c;
  background: white;
}

.weight-label {
  font-size: 0.75rem;
  color: #64748b;
  white-space: nowrap;
  flex-shrink: 0;
}

.input-weight {
  width: 4.5rem;
  padding: 0.55rem 0.5rem;
  font-size: 1rem;
  border: 1.5px solid #d1d5db;
  border-radius: 8px;
  background: #f9fafb;
  color: #111827;
  min-height: 44px;
  text-align: center;
  transition: border-color 0.2s;
  flex-shrink: 0;
}

.input-weight:focus {
  outline: none;
  border-color: #2c4a7c;
  background: white;
}

/* ===== Score table ===== */
.table-scroll {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.score-table {
  width: 100%;
  min-width: 400px;
  border-collapse: collapse;
  font-size: 0.875rem;
}

.score-table thead th {
  background: #f8fafc;
  color: #475569;
  font-weight: 600;
  padding: 0.6rem 0.5rem;
  text-align: center;
  border: 1px solid #e2e8f0;
  white-space: nowrap;
  font-size: 0.8rem;
}

.score-table thead th.th-option {
  text-align: left;
  min-width: 100px;
}

.score-table thead th .weight-badge {
  display: block;
  font-size: 0.7rem;
  font-weight: 400;
  color: #94a3b8;
  margin-top: 0.1rem;
}

.score-table tbody td {
  padding: 0.4rem 0.4rem;
  border: 1px solid #e2e8f0;
  text-align: center;
  vertical-align: middle;
}

.score-table tbody td.td-option-name {
  text-align: left;
  font-weight: 600;
  color: #1e293b;
  padding-left: 0.6rem;
  background: #f8fafc;
  white-space: nowrap;
  font-size: 0.875rem;
}

.score-input {
  width: 3.2rem;
  padding: 0.35rem 0.25rem;
  font-size: 0.95rem;
  border: 1.5px solid #d1d5db;
  border-radius: 6px;
  background: #fafafa;
  color: #111827;
  text-align: center;
  min-height: 44px;
  transition: border-color 0.2s, background 0.2s;
}

.score-input:focus {
  outline: none;
  border-color: #2c4a7c;
  background: white;
}

.score-input.score-high {
  border-color: #16a34a;
  background: #f0fdf4;
  color: #15803d;
  font-weight: 700;
}

.score-input.score-low {
  border-color: #dc2626;
  background: #fef2f2;
  color: #dc2626;
}

/* ===== Result list ===== */
.result-item {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.875rem 0.75rem;
  border-radius: 10px;
  border: 1.5px solid #e2e8f0;
  margin-bottom: 0.6rem;
  background: #f8fafc;
  transition: border-color 0.2s, box-shadow 0.2s;
}

.result-item:last-child {
  margin-bottom: 0;
}

.result-item.result-top {
  background: #eff6ff;
  border-color: #2c4a7c;
  box-shadow: 0 2px 8px rgba(44, 74, 124, 0.15);
}

.result-rank {
  font-size: 1.1rem;
  font-weight: 700;
  color: #94a3b8;
  min-width: 2rem;
  text-align: center;
  flex-shrink: 0;
}

.result-item.result-top .result-rank {
  color: #2c4a7c;
  font-size: 1.3rem;
}

.result-info {
  flex: 1;
  min-width: 0;
}

.result-name {
  font-size: 0.95rem;
  font-weight: 700;
  color: #1e293b;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.result-item.result-top .result-name {
  color: #1a2a4a;
}

/* CSS bar chart */
.result-bar-wrap {
  margin-top: 0.35rem;
  background: #e2e8f0;
  border-radius: 4px;
  height: 10px;
  overflow: hidden;
}

.result-bar {
  height: 100%;
  border-radius: 4px;
  background: #94a3b8;
  transition: width 0.4s ease;
}

.result-item.result-top .result-bar {
  background: linear-gradient(90deg, #2c4a7c, #3b6dbd);
}

.result-score-block {
  text-align: right;
  flex-shrink: 0;
}

.result-score {
  font-size: 1.5rem;
  font-weight: 700;
  color: #1a2a4a;
  line-height: 1;
}

.result-item.result-top .result-score {
  color: #2c4a7c;
  font-size: 1.7rem;
}

.result-score-label {
  font-size: 0.7rem;
  color: #94a3b8;
  margin-top: 0.15rem;
}

.badge-recommended {
  background: #2c4a7c;
  color: white;
  font-size: 0.68rem;
  font-weight: 700;
  padding: 0.18rem 0.5rem;
  border-radius: 20px;
  white-space: nowrap;
  letter-spacing: 0.02em;
  flex-shrink: 0;
}

/* ===== Howto section ===== */
.howto-section {
  background: white;
  border-radius: 12px;
  padding: 1.5rem 1rem;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.06);
}

.howto-section h2 {
  font-size: 1.05rem;
  color: #1a2a4a;
  margin-bottom: 0.75rem;
  margin-top: 1.5rem;
  padding-top: 1.5rem;
  border-top: 1px solid #e2e8f0;
}

.howto-section h2:first-child {
  margin-top: 0;
  padding-top: 0;
  border-top: none;
}

.howto-section ol {
  padding-left: 1.25rem;
  color: #4b5563;
  font-size: 0.9rem;
}

.howto-section ol li {
  margin-bottom: 0.5rem;
  line-height: 1.6;
}

.howto-section p {
  font-size: 0.9rem;
  color: #4b5563;
  line-height: 1.8;
  margin-bottom: 0.75rem;
}

.howto-section p:last-of-type {
  margin-bottom: 0;
}

/* ===== Affiliate block ===== */
.affiliate-block {
  margin-top: 1.5rem;
  padding: 1rem;
  background: #fafafa;
  border: 1px solid #e5e7eb;
  border-radius: 8px;
}

.affiliate-label {
  display: inline-block;
  font-size: 0.7rem;
  font-weight: 700;
  color: #9ca3af;
  border: 1px solid #d1d5db;
  padding: 0 0.35rem;
  border-radius: 3px;
  margin-bottom: 0.5rem;
}

.affiliate-desc {
  font-size: 0.85rem;
  color: #4b5563;
  margin-bottom: 0.6rem;
}

.affiliate-link {
  display: inline-block;
  font-size: 0.875rem;
  font-weight: 600;
  color: #2c4a7c;
  text-decoration: underline;
  min-height: 44px;
  line-height: 44px;
}

/* ===== Footer ===== */
footer {
  text-align: center;
  padding: 2rem 1rem;
  font-size: 0.85rem;
  color: #9ca3af;
}

footer p {
  margin-bottom: 0.4rem;
}

footer a {
  color: #6b7280;
  text-decoration: none;
}

footer a:hover {
  text-decoration: underline;
}

/* ===== Empty state ===== */
.empty-state {
  text-align: center;
  padding: 2rem 1rem;
  color: #94a3b8;
  font-size: 0.875rem;
}

/* ===== Responsive: tablet+ ===== */
@media (min-width: 640px) {
  header {
    padding: 2rem 1.5rem;
  }

  header h1 {
    font-size: 1.45rem;
  }

  .subtitle {
    font-size: 0.95rem;
  }

  main {
    padding: 1.5rem 2rem;
  }

  .tool-section {
    padding: 1.5rem;
  }

  .score-input {
    width: 3.8rem;
  }

  .result-score {
    font-size: 1.7rem;
  }

  .result-item.result-top .result-score {
    font-size: 1.9rem;
  }
}