:root {
  --bg: #f5f8fb;
  --panel: #ffffff;
  --text: #28344a;
  --muted: #6a7388;
  --border: #d7dfea;
  --accent: #4263c7;
  --accent-soft: #eaf0ff;
  --sidebar: 260px;
  --list: 500px;
}

* { box-sizing: border-box; }

html, body { height: 100%; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Hiragino Sans",
               "Yu Gothic", "Noto Sans JP", sans-serif;
  line-height: 1.55;
}

.topbar {
  height: 58px;
  background: var(--panel);
  border-bottom: 1px solid var(--border);
}

.topbar-inner {
  height: 100%;
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 0 20px;
}

.topbar-inner span {
  color: var(--muted);
  font-size: .9rem;
}

.app-shell {
  height: calc(100vh - 58px);
  display: grid;
  grid-template-columns: var(--sidebar) var(--list) minmax(520px, 1fr);
}

.sidebar, .results-pane, .detail-pane {
  min-height: 0;
  overflow: auto;
  border-right: 1px solid var(--border);
}

.sidebar {
  background: var(--panel);
  padding: 18px;
}

.filter-form {
  display: grid;
  gap: 14px;
}

.filter-form h2 {
  font-size: 1rem;
  margin: 0;
}

label {
  display: grid;
  gap: 5px;
  font-size: .85rem;
  font-weight: 700;
}

input, select, button, .button {
  font: inherit;
}

input, select {
  width: 100%;
  padding: 9px 10px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--panel);
  color: var(--text);
}

.year-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
}

button, .button {
  padding: 9px 12px;
  border: 1px solid var(--accent);
  border-radius: 8px;
  background: var(--accent);
  color: white;
  text-decoration: none;
  cursor: pointer;
  text-align: center;
}

.button.ghost {
  background: var(--panel);
  color: var(--accent);
}

.results-pane {
  background: #f7f9fb;
}

.results-header {
  position: sticky;
  top: 0;
  z-index: 2;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 16px;
  background: rgba(247, 249, 251, .95);
  border-bottom: 1px solid var(--border);
  backdrop-filter: blur(8px);
}

.results-header h1 {
  margin: 0;
  font-size: 1.05rem;
}

.paper-list { padding: 10px; }

.paper-row {
  width: 100%;
  display: grid;
  grid-template-columns: 58px 1fr;
  gap: 10px;
  margin-bottom: 8px;
  padding: 13px;
  background: var(--panel);
  color: var(--text);
  border: 1px solid var(--border);
  text-align: left;
}

.paper-row:hover,
.paper-row.selected {
  border-color: var(--accent);
  background: var(--accent-soft);
}

.paper-year { font-weight: 800; }

.paper-summary-block {
  display: grid;
  gap: 4px;
  min-width: 0;
}

.paper-summary-block strong {
  line-height: 1.35;
}

.paper-summary-block span,
.paper-summary-block small {
  color: var(--muted);
}

.paper-tags {
  grid-column: 2;
  display: flex;
  flex-wrap: wrap;
  gap: 5px;
}

.paper-tags span {
  padding: 2px 7px;
  border-radius: 999px;
  background: var(--accent-soft);
  font-size: .75rem;
}

.detail-pane {
  background: var(--panel);
  border-right: none;
}

.detail-placeholder {
  padding: 40px;
  color: var(--muted);
}

.detail-toolbar {
  position: sticky;
  top: 0;
  z-index: 3;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  padding: 12px 18px;
  background: rgba(255,255,255,.96);
  border-bottom: 1px solid var(--border);
  backdrop-filter: blur(8px);
}

.detail-content {
  padding: 22px;
}

.detail-content h2 {
  margin-top: 0;
  line-height: 1.35;
}

.metadata {
  display: grid;
  grid-template-columns: 120px 1fr;
  gap: 7px 12px;
  padding: 14px;
  background: #f7f9fb;
  border-radius: 10px;
}

.metadata dt { font-weight: 800; }
.metadata dd { margin: 0; overflow-wrap: anywhere; }

.detail-section {
  margin-top: 24px;
  padding-top: 18px;
  border-top: 1px solid var(--border);
}

.detail-section h3 { margin-top: 0; }
.detail-section p { white-space: pre-wrap; }





.similar-list {
  display: grid;
  gap: 8px;
}

.similar-paper {
  background: var(--panel);
  color: var(--text);
  border-color: var(--border);
  text-align: left;
}

.similar-paper span {
  display: block;
  color: var(--muted);
  font-size: .85rem;
  margin-top: 3px;
}

.empty { padding: 20px; }

@media (max-width: 1200px) {
  :root { --list: 430px; }
  .app-shell {
    grid-template-columns: 230px var(--list) minmax(420px, 1fr);
  }
}

@media (max-width: 900px) {
  .app-shell {
    height: auto;
    display: block;
  }

  .sidebar, .results-pane, .detail-pane {
    border-right: none;
    overflow: visible;
  }

  .detail-pane { min-height: 400px; }
}




.mobile-detail-close {
  display: none;
}

@media (max-width: 900px) {
  body.detail-modal-open {
    overflow: hidden;
  }

  .detail-pane.mobile-detail-open {
    position: fixed;
    inset: 0;
    z-index: 1000;
    display: block;
    min-height: 0;
    overflow-y: auto;
    overscroll-behavior: contain;
    background: var(--panel);
  }

  .detail-pane.mobile-detail-open .detail-toolbar {
    top: 0;
    padding: 10px 12px;
  }

  .detail-pane.mobile-detail-open .mobile-detail-close {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    flex-basis: 100%;
  }

  .detail-pane.mobile-detail-open .detail-content {
    padding: 16px;
  }

  .detail-pane.mobile-detail-open .detail-content h2 {
    font-size: 1.35rem;
  }

  .detail-pane.mobile-detail-open .metadata {
    grid-template-columns: 92px minmax(0, 1fr);
    gap: 8px 10px;
    padding: 12px;
  }

  .detail-pane.mobile-detail-open .detail-toolbar .button {
    flex: 1 1 auto;
  }
}