/* ========== RESET & BASE ========== */
*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  --navy: #1c1208;
  --navy-light: #2d1f10;
  --blue: #9a6b2a;
  --blue-light: #c49040;
  --blue-pale: #f0e0c0;
  --orange: #c25c3a;
  --orange-pale: #f5e0d8;
  --gray-50: #faf6f0;
  --gray-100: #f2ebe0;
  --gray-200: #e0d0b8;
  --gray-300: #c8b090;
  --gray-400: #a08060;
  --gray-600: #6a4e30;
  --gray-700: #4e3520;
  --gray-800: #342010;
  --gray-900: #1c1208;
  --white: #fffef9;
  --radius: 10px;
  --radius-lg: 14px;
  --shadow: 0 1px 3px rgba(50,30,10,0.07), 0 4px 12px rgba(50,30,10,0.05);
  --shadow-lg: 0 4px 6px rgba(50,30,10,0.06), 0 10px 40px rgba(50,30,10,0.10);
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: 'Noto Sans JP', -apple-system, BlinkMacSystemFont, sans-serif;
  background: var(--gray-50);
  background-image: radial-gradient(circle at 20% 80%, rgba(180,130,60,0.04) 0%, transparent 50%),
                    radial-gradient(circle at 80% 20%, rgba(100,60,20,0.04) 0%, transparent 50%);
  color: var(--gray-800);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 40px 24px;
}

/* ========== HEADER ========== */
.header {
  background: linear-gradient(135deg, #1c1208 0%, #2d1f10 60%, #3d2510 100%);
  color: var(--white);
  padding: 56px 24px 48px;
  text-align: center;
  position: relative;
  overflow: hidden;
  margin-bottom: 0;
  border-radius: 0;
  box-shadow: none;
}

.header::before {
  content: '';
  position: absolute;
  top: -40%;
  right: -10%;
  width: 400px;
  height: 400px;
  background: radial-gradient(circle, rgba(196,144,64,0.2) 0%, transparent 70%);
  border-radius: 50%;
  pointer-events: none;
}

.header h1 {
  font-family: 'Noto Serif JP', serif;
  font-size: clamp(1.8rem, 4vw, 2.8rem);
  font-weight: 700;
  letter-spacing: 0.05em;
  margin-bottom: 8px;
  position: relative;
  color: var(--white);
}

.subtitle {
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: #c49040;
  margin-bottom: 12px;
  position: relative;
}

.description {
  font-size: 0.88rem;
  color: rgba(255, 255, 255, 0.5);
  max-width: 520px;
  margin: 0 auto;
  position: relative;
}

/* ========== MODE SWITCHER ========== */
.mode-switcher {
  display: flex;
  gap: 6px;
  margin-bottom: 28px;
  background: var(--white);
  padding: 5px;
  border-radius: var(--radius);
  border: 1px solid var(--gray-200);
  width: fit-content;
  box-shadow: var(--shadow);
}

.mode-btn {
  padding: 9px 24px;
  border: none;
  border-radius: 8px;
  background: transparent;
  font-size: 0.875rem;
  font-weight: 600;
  cursor: pointer;
  color: var(--gray-600);
  transition: var(--transition);
  font-family: inherit;
}

.mode-btn.active[data-mode="explore"] {
  background: var(--blue);
  color: var(--white);
}

.mode-btn.active[data-mode="training"] {
  background: var(--orange);
  color: var(--white);
}

.mode-btn:hover:not(.active) {
  background: var(--gray-100);
  color: var(--gray-800);
}

/* ========== SEARCH SECTION ========== */
.search-section {
  background: var(--white);
  padding: 32px;
  border-radius: var(--radius-lg);
  border: 1px solid var(--gray-200);
  box-shadow: var(--shadow);
  margin-bottom: 32px;
}

.search-section h2 {
  font-size: 1rem;
  font-weight: 700;
  color: var(--gray-900);
  margin-bottom: 4px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.form-desc {
  font-size: 0.8rem;
  color: var(--gray-400);
  margin-bottom: 24px;
}

.search-form {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 16px;
  align-items: end;
}

.form-group {
  display: flex;
  flex-direction: column;
}

.form-group label {
  font-size: 0.8rem;
  font-weight: 600;
  margin-bottom: 6px;
  color: var(--gray-700);
}

.form-group select {
  padding: 9px 12px;
  border: 1px solid var(--gray-200);
  border-radius: 8px;
  font-size: 0.875rem;
  font-family: inherit;
  color: var(--gray-800);
  background: var(--white);
  transition: border-color var(--transition), box-shadow var(--transition);
  appearance: auto;
}

.form-group select:focus {
  outline: none;
  border-color: var(--blue);
  box-shadow: 0 0 0 3px rgba(37,99,235,0.1);
}

/* Checkbox group */
.checkbox-group {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 8px;
}

.checkbox-group label {
  display: flex;
  align-items: center;
  font-weight: normal;
  font-size: 0.875rem;
  cursor: pointer;
  color: var(--gray-700);
}

.checkbox-group input[type="checkbox"] {
  margin-right: 8px;
  cursor: pointer;
}

/* ========== BUTTONS ========== */
.search-button {
  padding: 10px 24px;
  border: none;
  border-radius: 8px;
  font-size: 0.875rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
  font-family: inherit;
  grid-column: 1 / -1;
}

.search-button.explore {
  background: var(--blue);
  color: var(--white);
}

.search-button.explore:hover {
  background: var(--blue-light);
  transform: translateY(-1px);
  box-shadow: 0 4px 16px rgba(37,99,235,0.3);
}

.generate-button {
  width: 100%;
  padding: 11px 24px;
  background: var(--orange);
  color: var(--white);
  border: none;
  border-radius: 8px;
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
  font-family: inherit;
}

.generate-button:hover {
  background: #d35400;
  transform: translateY(-1px);
  box-shadow: 0 4px 16px rgba(230,126,34,0.3);
}

.generate-note {
  text-align: center;
  font-size: 0.8rem;
  color: var(--gray-300);
  margin-top: 0;
}

/* ========== RESULTS SECTION ========== */
.results-section {
  margin-bottom: 40px;
}

.results-section h2 {
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--blue);
  margin-bottom: 16px;
}

.results-container {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 20px;
}

/* ========== CASE CARDS ========== */
.case-card {
  background: var(--white);
  border-radius: var(--radius);
  padding: 24px;
  border: 1px solid var(--gray-200);
  cursor: pointer;
  transition: var(--transition);
}

.case-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: var(--blue-pale);
}

.case-card h3 {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--gray-900);
  margin-bottom: 8px;
}

.case-card .category-badge {
  display: inline-block;
  padding: 3px 10px;
  background: var(--blue-pale);
  color: var(--blue);
  border-radius: 100px;
  font-size: 0.7rem;
  font-weight: 700;
  margin-bottom: 10px;
}

.training-badge {
  background: var(--orange-pale) !important;
  color: var(--orange) !important;
}

.training-card .category-badge {
  background: var(--orange-pale);
  color: var(--orange);
}

.case-card .info {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
  margin-bottom: 10px;
  font-size: 0.8rem;
}

.case-card .info-item {
  color: var(--gray-600);
}

.case-card .info-label {
  font-weight: 600;
  color: var(--gray-700);
  display: block;
}

.case-card .view-details {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--blue);
  display: inline-block;
  transition: transform var(--transition);
}

.case-card:hover .view-details {
  transform: translateX(4px);
}

.summary {
  font-size: 0.8rem;
  color: var(--gray-600);
  margin: 6px 0 10px;
  line-height: 1.6;
}

.no-results {
  text-align: center;
  color: var(--gray-400);
  padding: 48px 20px;
  font-size: 0.9rem;
}

/* ========== MODAL ========== */
.modal {
  display: none;
  position: fixed;
  z-index: 1000;
  left: 0;
  top: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.4);
  backdrop-filter: blur(4px);
  overflow: auto;
}

.modal-content {
  background: var(--white);
  margin: 5% auto;
  padding: 32px;
  border-radius: var(--radius-lg);
  width: 90%;
  max-width: 600px;
  max-height: 80vh;
  overflow-y: auto;
  box-shadow: 0 20px 60px rgba(0,0,0,0.15);
}

.close {
  color: var(--gray-400);
  float: right;
  font-size: 22px;
  font-weight: 400;
  cursor: pointer;
  line-height: 20px;
  transition: color var(--transition);
}

.close:hover {
  color: var(--gray-800);
}

.modal-content h2 {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--gray-900);
  margin-bottom: 20px;
  margin-top: 8px;
}

#modalBody {
  font-size: 0.875rem;
  color: var(--gray-700);
  margin-bottom: 20px;
}

#modalBody table {
  width: 100%;
  border-collapse: collapse;
  margin-bottom: 16px;
}

#modalBody th,
#modalBody td {
  padding: 10px 12px;
  text-align: left;
  border-bottom: 1px solid var(--gray-100);
  font-size: 0.83rem;
}

#modalBody th {
  background: var(--gray-50);
  font-weight: 600;
  color: var(--gray-700);
  width: 32%;
}

.adopt-button {
  padding: 12px 24px;
  background: var(--blue);
  color: var(--white);
  border: none;
  border-radius: 8px;
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
  width: 100%;
  font-family: inherit;
}

.adopt-button:hover {
  background: var(--blue-light);
  transform: translateY(-1px);
}

.generation-tip {
  margin-top: 16px;
  padding: 12px 16px;
  background: var(--gray-50);
  border-left: 3px solid var(--blue-light);
  border-radius: 0 var(--radius) var(--radius) 0;
  font-size: 0.85rem;
  color: var(--gray-600);
}

.tip-label {
  font-weight: 700;
  color: var(--blue);
  margin-bottom: 4px;
}

/* ========== API KEY SECTION ========== */
.api-key-section {
  background: var(--gray-50);
  border: 1px solid var(--gray-200);
  border-radius: 10px;
  padding: 16px 20px;
  margin-bottom: 24px;
}

.api-key-inner label {
  display: block;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--gray-700);
  margin-bottom: 8px;
}

.api-key-row {
  display: flex;
  gap: 8px;
}

.api-key-row input {
  flex: 1;
  padding: 8px 12px;
  border: 1px solid var(--gray-200);
  border-radius: 8px;
  font-size: 0.875rem;
  font-family: inherit;
  transition: border-color var(--transition);
}

.api-key-row input:focus {
  outline: none;
  border-color: var(--blue);
  box-shadow: 0 0 0 3px rgba(37,99,235,0.08);
}

.api-key-save {
  padding: 8px 16px;
  background: var(--gray-700);
  color: var(--white);
  border: none;
  border-radius: 8px;
  font-size: 0.82rem;
  font-weight: 600;
  cursor: pointer;
  font-family: inherit;
  transition: background var(--transition);
}

.api-key-save:hover { background: var(--gray-900); }

.api-key-note {
  font-size: 0.73rem;
  color: var(--gray-400);
  margin-top: 6px;
}

.api-key-set {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 20px;
}

.api-key-ok {
  font-size: 0.82rem;
  color: #059669;
  font-weight: 600;
}

.api-key-clear {
  font-size: 0.75rem;
  color: var(--gray-400);
  background: none;
  border: 1px solid var(--gray-200);
  border-radius: 6px;
  padding: 3px 10px;
  cursor: pointer;
  font-family: inherit;
  transition: var(--transition);
}

.api-key-clear:hover { color: var(--gray-700); border-color: var(--gray-400); }

/* ========== FORM EXTRAS ========== */
.full-width {
  grid-column: 1 / -1;
}

.full-width input[type="text"] {
  width: 100%;
  padding: 9px 12px;
  border: 1px solid var(--gray-200);
  border-radius: 8px;
  font-size: 0.875rem;
  font-family: inherit;
  color: var(--gray-800);
  transition: border-color var(--transition), box-shadow var(--transition);
}

.full-width input[type="text"]:focus {
  outline: none;
  border-color: var(--orange);
  box-shadow: 0 0 0 3px rgba(230,126,34,0.1);
}

.required {
  font-size: 0.7rem;
  color: var(--orange);
  font-weight: normal;
  margin-left: 4px;
}

.button-group {
  grid-column: 1 / -1;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

/* ========== LOADING ========== */
.loading {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 60px 20px;
  color: var(--gray-400);
  font-size: 0.875rem;
}

.spinner {
  width: 36px;
  height: 36px;
  border: 3px solid var(--gray-200);
  border-top-color: var(--orange);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
  margin-bottom: 16px;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

/* ========== AI GENERATED CARD ========== */
.generated-card {
  background: var(--white);
  border-radius: var(--radius-lg);
  padding: 32px;
  border: 1px solid var(--gray-200);
  border-left: 4px solid var(--orange);
  box-shadow: var(--shadow);
  grid-column: 1 / -1;
}

.generated-header {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 12px;
}

.ai-badge {
  display: inline-block;
  padding: 3px 10px;
  background: var(--orange);
  color: var(--white);
  border-radius: 6px;
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.05em;
}

.generated-card h3 {
  font-size: 1.15rem;
  font-weight: 900;
  color: var(--gray-900);
  margin-bottom: 8px;
  letter-spacing: -0.01em;
}

.generated-body {
  margin: 20px 0;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.gen-label {
  font-size: 0.68rem;
  font-weight: 700;
  color: var(--gray-400);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 6px;
}

.steps {
  margin: 0;
  padding-left: 20px;
  color: var(--gray-700);
  line-height: 1.8;
  font-size: 0.875rem;
}

.steps li { margin-bottom: 4px; }

.gen-section p {
  color: var(--gray-700);
  line-height: 1.7;
  font-size: 0.875rem;
  margin: 0;
}

.error { color: #dc2626; }

/* ========== MODE LABELS ========== */
.mode-label {
  display: inline-block;
  padding: 2px 8px;
  border-radius: 6px;
  font-size: 0.66rem;
  font-weight: 700;
  vertical-align: middle;
  margin-left: 8px;
  letter-spacing: 0.05em;
}

.mode-label.explore {
  background: var(--blue-pale);
  color: var(--blue);
}

.mode-label.training {
  background: var(--orange-pale);
  color: var(--orange);
}

/* ========== API GUIDE ========== */
.api-guide {
  margin-bottom: 16px;
  border: 1px solid var(--gray-200);
  border-radius: var(--radius);
  overflow: hidden;
}

.api-guide-summary {
  padding: 12px 16px;
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--gray-700);
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  gap: 8px;
  background: var(--gray-50);
  transition: background var(--transition);
}

.api-guide-summary::-webkit-details-marker { display: none; }

.api-guide-summary::before {
  content: '▶';
  font-size: 0.6rem;
  color: var(--blue-light);
  transition: transform var(--transition);
}

details[open] .api-guide-summary::before {
  transform: rotate(90deg);
}

.api-guide-summary:hover {
  background: var(--gray-100);
}

.api-guide-body {
  padding: 20px;
  border-top: 1px solid var(--gray-200);
  background: var(--white);
}

.api-guide-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 16px;
  margin-bottom: 20px;
}

.api-guide-item {
  padding: 14px;
  background: var(--gray-50);
  border-radius: 8px;
  border: 1px solid var(--gray-200);
}

.api-guide-icon {
  font-size: 1.2rem;
  margin-bottom: 6px;
}

.api-guide-item h4 {
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--gray-800);
  margin-bottom: 6px;
}

.api-guide-item p {
  font-size: 0.78rem;
  color: var(--gray-600);
  line-height: 1.6;
}

.api-guide-steps {
  background: var(--gray-50);
  border-radius: 8px;
  padding: 14px 16px;
  border: 1px solid var(--gray-200);
}

.api-guide-steps h4 {
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--gray-800);
  margin-bottom: 10px;
}

.api-guide-steps ol {
  padding-left: 18px;
  margin: 0;
}

.api-guide-steps li {
  font-size: 0.8rem;
  color: var(--gray-700);
  line-height: 1.7;
  margin-bottom: 2px;
}

.api-guide-steps a {
  color: var(--blue-light);
  text-decoration: underline;
  font-weight: 600;
}

/* ========== FEEDBACK SECTION ========== */
.feedback-section {
  background: linear-gradient(135deg, #1c1208 0%, #2d1f10 60%, #3d2510 100%);
  padding: 64px 24px;
  text-align: center;
  margin-top: 40px;
}

.feedback-inner {
  max-width: 520px;
  margin: 0 auto;
}

.feedback-label {
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: #c49040;
  margin-bottom: 12px;
}

.feedback-section h2 {
  font-family: 'Noto Serif JP', serif;
  font-size: clamp(1.2rem, 3vw, 1.6rem);
  font-weight: 700;
  color: var(--white);
  margin-bottom: 12px;
  letter-spacing: 0.03em;
}

.feedback-desc {
  font-size: 0.88rem;
  color: rgba(255, 255, 255, 0.6);
  line-height: 1.8;
  margin-bottom: 28px;
}

.feedback-btn {
  display: inline-block;
  padding: 13px 32px;
  background: #c49040;
  color: var(--white);
  border-radius: 8px;
  font-size: 0.9rem;
  font-weight: 700;
  text-decoration: none;
  transition: var(--transition);
  letter-spacing: 0.02em;
}

.feedback-btn:hover {
  background: #d4a850;
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(196,144,64,0.3);
}

/* ========== FOOTER ========== */
.footer {
  text-align: center;
  padding: 24px;
  color: var(--gray-400);
  margin-top: 40px;
  font-size: 0.75rem;
  border-top: 1px solid var(--gray-200);
}

.footer p { margin: 4px 0; }

/* ========== UTILITY ========== */
.hidden { display: none; }

/* ========== RESPONSIVE ========== */
@media (max-width: 768px) {
  .header {
    padding: 40px 20px 36px;
  }

  .container {
    padding: 24px 16px;
  }

  .search-form {
    grid-template-columns: 1fr;
  }

  .results-container {
    grid-template-columns: 1fr;
  }

  .checkbox-group {
    grid-template-columns: 1fr;
  }

  .mode-switcher {
    width: 100%;
    justify-content: center;
  }

  .search-section {
    padding: 20px;
  }

  .generated-card {
    padding: 20px;
  }
}