:root {
  --bg: #f7f9fc;
  --bg-alt: #ffffff;
  --panel: #ffffff;
  --panel-strong: #ffffff;
  --border: #dfe5f0;
  --text: #1f2a44;
  --muted: #5f6c86;
  --accent: #1d9bf0;
  --accent-2: #ffb347;
  --error: #d94f4f;
  --shadow: 0 12px 30px rgba(31, 42, 68, 0.12);
  --radius: 14px;
  --gap: 18px;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: 'Noto Sans JP', 'Space Grotesk', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  background: linear-gradient(180deg, #f7f9fc 0%, #eef3fb 60%, #e8f1ff 100%);
  color: var(--text);
  min-height: 100vh;
}

.page {
  width: min(1180px, 92vw);
  margin: 32px auto 60px;
}

.hero {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--gap);
  padding: 28px;
  background: var(--panel-strong);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  position: relative;
  overflow: hidden;
}

.hero::after {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at 70% 20%, rgba(29, 155, 240, 0.12), transparent 55%);
  pointer-events: none;
}

.hero__copy { position: relative; z-index: 1; }

.eyebrow {
  color: var(--accent);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  font-weight: 600;
  margin: 0 0 8px;
}

.hero h1 {
  margin: 0 0 12px;
  font-size: clamp(30px, 4vw, 40px);
  letter-spacing: -0.02em;
}

.lead {
  color: var(--muted);
  line-height: 1.6;
  margin: 0 0 16px;
}

.status {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 14px;
  background: rgba(29, 155, 240, 0.12);
  color: var(--accent);
  border: 1px solid rgba(29, 155, 240, 0.4);
  border-radius: 999px;
  font-weight: 600;
}

.panel {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px;
  box-shadow: var(--shadow);
}

.search-panel { margin: 22px 0; }

.search-form {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.form-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: var(--gap);
}

.field {
  display: flex;
  flex-direction: column;
  gap: 6px;
  color: var(--muted);
  font-weight: 500;
}

.field input,
.field select {
  padding: 12px;
  border-radius: 12px;
  border: 1px solid #d8deea;
  background: var(--bg-alt);
  color: var(--text);
  font-size: 15px;
}

.field input:focus,
.field select:focus {
  outline: 2px solid rgba(29, 155, 240, 0.35);
  border-color: rgba(29, 155, 240, 0.55);
}

.sort-group .segmented {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 8px;
}

.segmented button {
  padding: 10px 12px;
  border-radius: 12px;
  border: 1px solid #d8deea;
  background: var(--bg-alt);
  color: var(--text);
  cursor: pointer;
  transition: all 0.2s ease;
}

.segmented button.active {
  background: linear-gradient(135deg, rgba(29, 155, 240, 0.18), rgba(255, 179, 71, 0.2));
  border-color: rgba(29, 155, 240, 0.5);
  color: var(--text);
}

.actions {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
}

.chips {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.chip {
  padding: 8px 10px;
  border-radius: 999px;
  background: #eef3fb;
  border: 1px solid #d8deea;
  color: var(--muted);
  font-size: 13px;
}
.chip.soft {
  background: #f4f7ff;
  border-color: #dfe5f0;
}

.chip-row {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin: 6px 0 6px;
}

.muted {
  color: var(--muted);
}

.suggestions {
  position: absolute;
  z-index: 5;
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 8px;
  box-shadow: 0 12px 24px rgba(31, 42, 68, 0.12);
  margin-top: 4px;
  width: 100%;
  display: none;
}
.suggestion {
  padding: 10px 12px;
  cursor: pointer;
}
.suggestion:hover {
  background: #f0f6ff;
}

.action-buttons { display: flex; gap: 10px; }

button.primary,
button.ghost {
  padding: 12px 18px;
  border-radius: 12px;
  border: 1px solid var(--border);
  cursor: pointer;
  font-weight: 600;
  letter-spacing: 0.01em;
  transition: transform 0.15s ease, box-shadow 0.15s ease, background 0.15s ease;
}

button.primary {
  background: linear-gradient(135deg, rgba(29, 155, 240, 0.25), rgba(255, 179, 71, 0.25));
  color: var(--text);
  border-color: rgba(29, 155, 240, 0.5);
}

button.primary:hover { transform: translateY(-1px); box-shadow: var(--shadow); }

button.ghost {
  background: #eef3fb;
  color: var(--muted);
}

.layout {
  display: grid;
  grid-template-columns: 300px 1fr;
  gap: 18px;
}

.sidebar { display: flex; flex-direction: column; gap: 14px; }

.panel-title { font-weight: 700; margin-bottom: 8px; }

.info-panel p { color: var(--muted); }

.mini-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 10px;
  margin: 12px 0;
}

.label { color: var(--muted); margin: 0; font-size: 13px; }
.value { margin: 4px 0 0; font-weight: 700; }

.tips-panel ul {
  margin: 0;
  padding-left: 18px;
  color: var(--muted);
  line-height: 1.6;
}

.results {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.results__header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 10px;
}

.stats { color: var(--muted); }

.error {
  padding: 12px;
  border-radius: 10px;
  background: rgba(217, 79, 79, 0.12);
  border: 1px solid rgba(217, 79, 79, 0.4);
  color: #b12f2f;
}

.results__list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 14px;
}

.result-card {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 16px;
  position: relative;
  overflow: hidden;
  transition: transform 0.18s ease, border-color 0.18s ease, background 0.18s ease, box-shadow 0.18s ease;
}

.result-card::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(145deg, rgba(29, 155, 240, 0.06), transparent 40%);
  pointer-events: none;
}

.result-card:hover,
.result-card:focus-visible {
  transform: translateY(-2px);
  border-color: rgba(29, 155, 240, 0.6);
  background: #f0f6ff;
  box-shadow: 0 12px 30px rgba(31, 42, 68, 0.15);
  outline: none;
}

.result-card.type-article {
  border-color: color-mix(in srgb, #1d9bf0 40%, var(--border));
  background: color-mix(in srgb, #1d9bf0 6%, var(--panel));
}
.result-card.type-book {
  border-color: color-mix(in srgb, #f59e0b 40%, var(--border));
  background: color-mix(in srgb, #f59e0b 6%, var(--panel));
}
.result-card.type-dissertation {
  border-color: color-mix(in srgb, #8b5cf6 40%, var(--border));
  background: color-mix(in srgb, #8b5cf6 6%, var(--panel));
}
.result-card.type-library {
  border-color: color-mix(in srgb, #10b981 40%, var(--border));
  background: color-mix(in srgb, #10b981 6%, var(--panel));
}
.result-card.type-holder {
  border-color: color-mix(in srgb, #eab308 40%, var(--border));
  background: color-mix(in srgb, #eab308 6%, var(--panel));
}

.result-card.active {
  border-color: rgba(29, 155, 240, 0.8);
  box-shadow: 0 12px 30px rgba(31, 42, 68, 0.2);
}

.result-title {
  margin: 0 0 8px;
  font-size: 18px;
  line-height: 1.4;
}

.meta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  color: var(--muted);
  font-size: 14px;
  margin-bottom: 8px;
}

.meta-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 6px;
}

.type-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 8px;
  border-radius: 999px;
  border: 1px solid var(--border);
  font-weight: 700;
  font-size: 12px;
}

.desc {
  color: var(--muted);
  line-height: 1.5;
  margin: 10px 0;
}

.subjects {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
  margin: 8px 0;
}

.subjects .pill {
  padding: 6px 9px;
  background: #eef3fb;
  border: 1px solid #d8deea;
  border-radius: 999px;
  font-size: 12px;
  color: var(--muted);
  cursor: pointer;
}
.subjects .pill:hover {
  background: #e3ebfa;
}

.links {
  display: flex;
  gap: 12px;
  align-items: center;
  margin-top: 8px;
}

.links a {
  color: var(--accent);
  text-decoration: none;
  font-weight: 600;
}

.links button {
  padding: 8px 12px;
  border-radius: 10px;
  border: 1px solid #d8deea;
  background: #eef3fb;
  color: var(--text);
  cursor: pointer;
  font-weight: 600;
}

.links a:hover { text-decoration: underline; }
.links button:hover { background: #e3ebfa; }

.identifier {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 8px;
  background: #eef3fb;
  border-radius: 8px;
  color: var(--muted);
  font-size: 12px;
}
.identifier a {
  color: var(--accent);
  text-decoration: none;
}
.identifier a:hover { text-decoration: underline; }

.pagination {
  display: flex;
  justify-content: center;
  gap: 10px;
  margin: 10px 0 20px;
}

.pagination button {
  padding: 10px 14px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: var(--bg-alt);
  color: var(--text);
  cursor: pointer;
}

.pagination button[disabled] {
  opacity: 0.5;
  cursor: not-allowed;
}

.loading {
  position: fixed;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 12px;
  background: rgba(247, 249, 252, 0.8);
  color: var(--text);
  z-index: 10;
}

.loading.hidden { display: none; }

.spinner {
  width: 36px;
  height: 36px;
  border: 4px solid rgba(31, 42, 68, 0.15);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.9s linear infinite;
}

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

.modal {
  position: fixed;
  inset: 0;
  background: rgba(12, 19, 32, 0.35);
  display: flex;
  align-items: flex-start;
  justify-content: center;
  padding: 20px;
  z-index: 20;
  overflow: auto;
}

.modal.hidden { display: none; }

.modal__content {
  width: min(700px, 94vw);
  max-height: 90vh;
  background: #ffffff;
  border-radius: 14px;
  border: 1px solid #dfe5f0;
  box-shadow: 0 20px 40px rgba(31, 42, 68, 0.2);
  padding: 20px 22px 18px;
  position: relative;
  overflow: auto;
}

.modal__close {
  position: absolute;
  top: 10px;
  right: 12px;
  border: none;
  background: transparent;
  font-size: 22px;
  cursor: pointer;
  color: var(--muted);
}

.modal__title {
  margin: 0 0 8px;
  font-size: 21px;
}

.modal__meta {
  margin: 0 0 12px;
  color: var(--muted);
}

.modal__desc {
  margin: 0 0 14px;
  color: var(--text);
  line-height: 1.6;
}

.modal__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 8px;
  margin: 6px 0 10px;
}

.modal__item {
  display: grid;
  grid-template-columns: 1fr;
  gap: 4px;
  align-items: start;
}

.modal__label {
  color: var(--muted);
  font-size: 13px;
}

.modal__value {
  color: var(--text);
  font-weight: 600;
}

.modal__muted { color: var(--muted); margin: 4px 0 0; }

.modal__pillRow {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin: 6px 0 4px;
}

.modal__pillRow .pill {
  background: #eef3fb;
  border: 1px solid #d8deea;
  border-radius: 999px;
  padding: 6px 10px;
  color: var(--muted);
  font-size: 12px;
}
.modal__pillRow .pill a {
  color: var(--accent);
  text-decoration: none;
}
.modal__pillRow .pill a:hover { text-decoration: underline; }

.modal__sectionTitle {
  width: 100%;
  margin: 4px 0 6px;
  color: var(--muted);
  font-weight: 700;
  letter-spacing: 0.02em;
  font-size: 13px;
}

.modal__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 6px 0 12px;
}

.modal__btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 10px 14px;
  border-radius: 10px;
  border: 1px solid #d8deea;
  background: #eef3fb;
  color: var(--text);
  font-weight: 700;
  text-decoration: none;
  cursor: pointer;
  min-width: 120px;
  text-align: center;
}

.modal__btn:hover { background: #e3ebfa; }
.modal__btn.disabled,
.modal__btn.disabled:hover {
  opacity: 0.55;
  cursor: not-allowed;
  background: #f4f6fb;
}

.group {
  margin-bottom: 18px;
  padding: 12px;
  border-radius: 12px;
  border: 1px solid var(--border);
  background: #fff;
}
.group-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 10px;
}
.group-title {
  font-weight: 700;
}
.group-count {
  color: var(--muted);
  font-size: 13px;
}
.group-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 12px;
}

.subject-group {
  margin-top: 12px;
}
.subject-list {
  list-style: none;
  padding-left: 0;
  margin: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 6px;
}
.subject-item {
  padding: 8px 10px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: #f9fbff;
  cursor: pointer;
}
.subject-item:hover {
  background: #f0f6ff;
}

.list-column {
  list-style: none;
  padding-left: 0;
  margin: 6px 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 6px;
}
.list-column li {
  padding: 8px 10px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: #f9fbff;
}
.list-column a {
  color: var(--accent);
  text-decoration: none;
  font-weight: 600;
}
.list-column a:hover { text-decoration: underline; }

.footer {
  text-align: center;
  padding: 16px 0 28px;
  color: var(--muted);
  font-size: 14px;
}

.footer a { color: var(--accent); text-decoration: none; }
.footer a:hover { text-decoration: underline; }

@media (max-width: 1024px) {
  .form-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .layout { grid-template-columns: 1fr; }
}

@media (max-width: 640px) {
  .page { width: 94vw; margin-top: 20px; }
  .form-grid { grid-template-columns: 1fr; }
  .actions { flex-direction: column; align-items: flex-start; }
  .results__list { grid-template-columns: 1fr; }
}