:root {
  --bg: #f5f6f8;
  --surface: #ffffff;
  --border: #d8dce3;
  --text: #1f2430;
  --muted: #6b7280;
  --primary: #2563eb;
  --primary-hover: #1d4ed8;
  --header-bg: #eef1f6;
  --stripe: #fafbfc;
  --focus: rgba(37, 99, 235, 0.15);
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.5;
}

.app-header {
  position: relative;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  padding: 20px 24px;
}

.header-right {
  position: absolute;
  top: 16px;
  right: 24px;
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 8px;
}

.coffee-btn {
  display: inline-block;
  line-height: 0;
  text-decoration: none;
}

.coffee-btn .coffee-img {
  height: 42px;
  width: auto;
  display: block;
}

.built-with {
  font-size: 12px;
  font-weight: 500;
  color: var(--muted);
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 5px 12px;
  white-space: nowrap;
}

.built-with a {
  color: var(--primary);
  text-decoration: none;
}

.built-with a:hover {
  text-decoration: underline;
}

.built-with strong {
  color: var(--primary);
}

.app-header h1 {
  font-size: 22px;
  font-weight: 700;
}

.app-header .subtitle {
  color: var(--muted);
  font-size: 14px;
  margin-top: 4px;
}

.app-header .source-note {
  font-size: 13px;
  margin-top: 8px;
}

.app-header .source-note a {
  color: var(--primary);
  text-decoration: none;
}

.app-header .source-note a:hover {
  text-decoration: underline;
}

.app-header .score-source-note {
  color: #dc2626;
}

.score-source-note a {
  font-weight: 700;
}

/* ---------- Round selector ---------- */
.round-selector {
  margin-top: 18px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--bg);
  padding: 14px 16px;
  display: flex;
  align-items: center;
  gap: 14px;
  flex-wrap: wrap;
}

.round-selector legend {
  padding: 0 6px;
  font-size: 12px;
  font-weight: 700;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

.round-options {
  display: flex;
  gap: 8px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 4px;
}

.round-option {
  position: relative;
}

.round-option input {
  position: absolute;
  opacity: 0;
  pointer-events: none;
}

.round-option span {
  display: inline-block;
  padding: 7px 18px;
  font-size: 14px;
  font-weight: 600;
  color: var(--text);
  border-radius: 6px;
  cursor: pointer;
  transition: background 0.15s ease, color 0.15s ease;
  user-select: none;
}

.round-option:hover span {
  background: var(--header-bg);
}

.round-option input:checked + span {
  background: var(--primary);
  color: #fff;
}

.round-option input:checked:hover span {
  background: var(--primary-hover);
}

.round-option input:focus-visible + span {
  outline: none;
  box-shadow: 0 0 0 3px var(--focus);
}

.round-desc {
  font-size: 13px;
  color: var(--muted);
  flex: 1 1 220px;
  min-width: 0;
}

main {
  max-width: 1400px;
  margin: 0 auto;
  padding: 20px 24px 48px;
}

/* ---------- Filter bar ---------- */
.filter-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  gap: 12px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 16px;
  margin-bottom: 16px;
}

.filter-control {
  min-width: 180px;
  max-width: 260px;
}

.filter-control label {
  display: block;
  font-size: 12px;
  font-weight: 600;
  color: var(--muted);
  margin-bottom: 4px;
  white-space: nowrap;
}

.filter-control.filter-institute {
  flex: 1 1 260px;
  max-width: 420px;
}

.filter-actions {
  display: flex;
  gap: 8px;
  padding-bottom: 1px;
}

/* ---------- Buttons ---------- */
.btn {
  appearance: none;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
  border-radius: 6px;
  padding: 8px 14px;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  white-space: nowrap;
  transition: background 0.15s ease, border-color 0.15s ease;
}

.btn:hover {
  background: var(--header-bg);
}

.btn-primary {
  background: var(--primary);
  border-color: var(--primary);
  color: #fff;
}

.btn-primary:hover {
  background: var(--primary-hover);
  border-color: var(--primary-hover);
}

/* ---------- Dropdown (single-select) ---------- */
.dropdown {
  position: relative;
}

.dropdown-trigger {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  text-align: left;
  padding: 8px 10px;
  font-size: 14px;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--surface);
  cursor: pointer;
}

.dropdown-trigger .dd-label {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  color: var(--text);
}

.dropdown-trigger .dd-label.is-muted {
  color: var(--muted);
  font-weight: 400;
}

.dropdown-trigger .dd-arrow {
  flex-shrink: 0;
  color: var(--muted);
  font-size: 10px;
  transition: transform 0.15s ease;
}

.dropdown.open .dd-arrow {
  transform: rotate(180deg);
}

.dropdown-panel {
  position: absolute;
  top: calc(100% + 4px);
  left: 0;
  right: 0;
  min-width: 220px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  box-shadow: 0 8px 24px rgba(15, 23, 42, 0.12);
  z-index: 20;
  display: none;
}

.dropdown.open .dropdown-panel {
  display: block;
}

.dd-search {
  width: 100%;
  border: none;
  border-bottom: 1px solid var(--border);
  padding: 10px 12px;
  font-size: 14px;
  outline: none;
  border-radius: 8px 8px 0 0;
  background: var(--surface);
}

.dd-options {
  max-height: 280px;
  overflow-y: auto;
  padding: 4px;
}

.dd-option {
  display: block;
  width: 100%;
  text-align: left;
  border: none;
  background: none;
  padding: 8px 10px;
  font-size: 14px;
  border-radius: 5px;
  cursor: pointer;
  color: var(--text);
}

.dd-option:hover {
  background: var(--focus);
}

.dd-option.selected {
  font-weight: 700;
  color: var(--primary);
}

.dd-option.dd-any {
  color: var(--muted);
  font-weight: 400;
}

.dd-empty {
  padding: 10px 12px;
  color: var(--muted);
  font-size: 13px;
}

/* ---------- Institute autocomplete ---------- */
.autocomplete {
  position: relative;
  display: flex;
  align-items: center;
}

.autocomplete input {
  width: 100%;
  padding: 8px 30px 8px 10px;
  font-size: 14px;
  border: 1px solid var(--border);
  border-radius: 6px;
  outline: none;
  background: var(--surface);
}

.autocomplete input:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px var(--focus);
}

.ac-clear {
  position: absolute;
  right: 6px;
  border: none;
  background: none;
  color: var(--muted);
  font-size: 16px;
  line-height: 1;
  cursor: pointer;
  padding: 2px 4px;
  display: none;
}

.ac-clear:hover {
  color: var(--text);
}

.ac-clear.visible {
  display: block;
}

.ac-list {
  position: absolute;
  top: calc(100% + 4px);
  left: 0;
  right: 0;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  box-shadow: 0 8px 24px rgba(15, 23, 42, 0.12);
  z-index: 20;
  max-height: 280px;
  overflow-y: auto;
  display: none;
}

.ac-list.visible {
  display: block;
}

.ac-item {
  display: block;
  width: 100%;
  text-align: left;
  border: none;
  background: none;
  padding: 8px 12px;
  font-size: 14px;
  cursor: pointer;
  border-radius: 5px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.ac-item:hover {
  background: var(--focus);
}

.ac-empty {
  padding: 10px 12px;
  color: var(--muted);
  font-size: 13px;
}

/* ---------- Filter hint ---------- */
.filter-hint {
  margin: -8px 0 16px;
  padding: 10px 14px;
  font-size: 13px;
  color: var(--text);
  background: #eff6ff;
  border: 1px solid #bfdbfe;
  border-left: 4px solid var(--primary);
  border-radius: 6px;
}

.filter-hint strong {
  color: var(--primary-hover);
}

/* ---------- Results info ---------- */
.results-info {
  margin-bottom: 12px;
}

.result-count {
  font-size: 14px;
  color: var(--muted);
}

.result-count strong {
  color: var(--text);
}

/* ---------- Table ---------- */
.table-wrap {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  overflow-x: auto;
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
  min-width: 1100px;
}

thead th {
  position: sticky;
  top: 0;
  background: var(--header-bg);
  border-bottom: 2px solid var(--border);
  padding: 10px 12px;
  text-align: left;
  font-size: 12px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.03em;
  color: var(--muted);
  cursor: pointer;
  user-select: none;
  white-space: nowrap;
}

thead th:hover {
  color: var(--text);
}

thead th .sort-ind {
  margin-left: 4px;
  font-size: 10px;
}

tbody td {
  padding: 9px 12px;
  border-bottom: 1px solid var(--border);
  vertical-align: top;
}

tbody tr:nth-child(even) {
  background: var(--stripe);
}

tbody tr:hover {
  background: var(--focus);
}

td.col-rank {
  font-weight: 700;
  font-variant-numeric: tabular-nums;
}

td.col-score {
  font-variant-numeric: tabular-nums;
}

.empty-cell {
  text-align: center;
  color: var(--muted);
  padding: 40px 12px;
}

/* ---------- Pagination ---------- */
.pagination {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  margin-top: 16px;
}

.page-info {
  font-size: 14px;
  color: var(--muted);
}

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

.btn:disabled:hover {
  background: var(--surface);
}

@media (max-width: 640px) {
  .app-header {
    padding-top: 104px;
  }

  .header-right {
    top: 12px;
    right: 12px;
  }
}