:root {
  color-scheme: light;
  font-family: "Inter", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.5;
  font-size: 16px;
  background-color: #f5f5f5;
  color: #1a1a1a;
}

body {
  margin: 0;
  min-height: 100vh;
  background: #f5f5f5;
}

#app {
  max-width: 1200px;
  margin: 0 auto;
  padding: 24px;
}

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

.header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  background: #fff;
  padding: 20px 24px;
  border-radius: 8px;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
  border: 1px solid #e0e0e0;
}

.header h1 {
  margin: 0 0 4px;
  font-size: 1.5rem;
  font-weight: 600;
  color: #1a1a1a;
}

.header p {
  margin: 2px 0;
  font-size: 0.95rem;
  color: #384152;
}

.header .subtitle {
  margin: 4px 0 8px;
  font-size: 0.9rem;
  color: #6b7280;
  font-weight: 400;
  font-style: italic;
}

.header button {
  margin-top: 8px;
}

.main {
  display: grid;
  grid-template-columns: 3fr 1fr;
  gap: 16px;
}

.panel,
.sidebar {
  background: #fff;
  padding: 20px;
  border-radius: 8px;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
  border: 1px solid #e0e0e0;
}

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

.sidebar-section {
  border: 1px solid #e4e8f3;
  border-radius: 10px;
  padding: 12px 14px;
}

.sidebar-section h2 {
  margin: 0 0 8px;
  font-size: 1.1rem;
}

.sidebar-section ul {
  list-style: none;
  margin: 0;
  padding: 0;
}

.sidebar-section li {
  margin: 4px 0;
  font-size: 0.95rem;
}

.subsection h3 {
  margin: 8px 0;
  font-size: 1rem;
}

.week-selector h2 {
  margin: 0 0 8px;
}

.button-row {
  display: flex;
  flex-wrap: nowrap;
  gap: 6px;
  overflow-x: auto;
}

.button-row button {
  padding: 8px 12px;
  border-radius: 6px;
  border: 1px solid #d0d7ed;
  background: #f5f7ff;
  cursor: pointer;
  transition: background 0.15s ease, color 0.15s ease;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 2px;
  font-size: 0.88rem;
  white-space: nowrap;
  flex-shrink: 0;
}

.button-row button.selected {
  background: #333;
  color: #fff;
  border-color: #333;
}

.button-row button.disabled {
  background: #f0f3f8;
  color: #7b8496;
  border-color: #d0d7ed;
  cursor: not-allowed;
}

.week-detail {
  font-size: 0.76rem;
  color: inherit;
  opacity: 0.8;
}

.button-row button:hover:not(.selected) {
  background: #e7ecff;
}

.button-row button.current-day {
  border: 2px solid #ff9800;
  box-shadow: 0 0 8px rgba(255, 152, 0, 0.3);
}

.button-row button.current-day.selected {
  border: 2px solid #ff9800;
  box-shadow: 0 0 8px rgba(255, 152, 0, 0.5);
}

.grid {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.88rem;
}

.gpu-grid {
  table-layout: fixed;
}

.gpu-grid thead th {
  background: #eff2ff;
  font-weight: 600;
}

.gpu-grid thead th:first-child {
  width: 90px;
}

.gpu-grid thead th:not(:first-child) {
  width: calc((100% - 90px) / 8);
  font-size: 0.82rem;
  padding: 4px;
}

.gpu-grid tbody th {
  text-align: left;
  background: #f4f6fb;
  font-weight: 600;
  font-size: 0.78rem;
  color: #384152;
  padding: 4px 6px;
}

.gpu-grid tbody td {
  width: calc((100% - 90px) / 8);
  user-select: none;
  cursor: cell;
}

.grid th,
.grid td {
  border: 1px solid #e4e8f3;
  padding: 6px;
  text-align: center;
}

.grid th {
  background: #eff2ff;
  font-weight: 600;
}

.grid-section {
  margin-top: 12px;
}

.notice {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 16px;
  padding: 12px 16px;
  border-radius: 10px;
  border: 1px solid #f5c173;
  background: #fff7e5;
  box-shadow: 0 6px 18px rgba(245, 193, 115, 0.2);
  margin-bottom: 12px;
}

.notice ul {
  margin: 8px 0 0;
  padding-left: 20px;
}

.notice button {
  align-self: center;
  padding: 8px 14px;
  border-radius: 6px;
  border: 1px solid #f5a326;
  background: #f5a326;
  color: #fff;
  cursor: pointer;
  font-weight: 600;
}

.notice.undo-alert {
  border-color: #6ba3ff;
  background: #e8f2ff;
  box-shadow: 0 6px 18px rgba(107, 163, 255, 0.2);
}

.notice.undo-alert button {
  border-color: #4a90e2;
  background: #4a90e2;
}

.slot {
  min-height: 44px;
  padding: 6px;
  text-align: center;
  background: #f9fbff;
  border: 1px solid transparent;
  transition: background 0.2s ease, border 0.2s ease;
}

.slot-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 2px;
  height: 100%;
}

.slot.open {
  background: #f9fbff;
  border-color: #e0e7ff;
}

.slot.locked {
  background: #f0f3f8;
  color: #7b8496;
  border-color: #d6dcea;
}

.slot.reserved {
  background: #ffe3e3;
  color: #7a2525;
  border: 2px solid #ff6b6b;
}

.slot.mine {
  background: #dff3ff;
  border: 2px solid #1d8bf1;
}

.slot.outbid {
  background: #fff5e8;
  border: 2px solid #f5a326;
}

/* Usage tracking visual states */
.slot.slot-owner-using {
  background: #d4edda !important;
  border: 2px solid #28a745 !important;
}

.slot.slot-owner-used {
  background: #d4edda !important;
  border: 2px solid #28a745 !important;
}

.slot.slot-owner-no-show {
  background: #fff3cd !important;
  border: 2px solid #ffc107 !important;
}

.slot.current-slot {
  box-shadow: inset 0 0 0 2px #ff9800;
  animation: pulse-current 2s ease-in-out infinite;
}

.slot.winner-highlighted {
  background: #fff3cd !important;
  border: 2px solid #ffc107 !important;
  box-shadow: 0 0 12px rgba(255, 193, 7, 0.4);
  z-index: 10;
  position: relative;
}

.release-btn {
  margin-top: 4px;
  padding: 4px 8px;
  font-size: 11px;
  background: #ff6b6b;
  color: white;
  border: 1px solid #e74c3c;
  border-radius: 4px;
  cursor: pointer;
  font-weight: 600;
  transition: background 0.2s ease;
}

.release-btn:hover {
  background: #e74c3c;
}

.bulk-selected {
  background: #e8f4ff !important;
  border: 2px solid #4a90e2 !important;
  box-shadow: inset 0 0 8px rgba(74, 144, 226, 0.3);
}

@keyframes pulse-current {
  0%, 100% {
    box-shadow: inset 0 0 0 2px #ff9800;
  }
  50% {
    box-shadow: inset 0 0 0 2px #ff9800, 0 0 12px rgba(255, 152, 0, 0.4);
  }
}

tr.current-hour {
  background: rgba(255, 152, 0, 0.05);
}

tr.current-hour th {
  background: rgba(255, 152, 0, 0.15) !important;
  font-weight: 700;
}

.slot button {
  padding: 4px 8px;
  font-size: 0.8rem;
  font-weight: 500;
  border-radius: 3px;
  border: 1px solid #333;
  background: #333;
  color: #fff;
  cursor: pointer;
  transition: background 0.15s ease;
  margin-top: 2px;
}

.slot button:hover:not(:disabled) {
  background: #555;
  border-color: #555;
}

.slot button:disabled {
  background: #d0d7ed;
  border-color: #d0d7ed;
  color: #5b6579;
  cursor: default;
}

.slot-winner {
  font-size: 0.72rem;
  color: #5b6579;
}

.slot-winner strong {
  font-size: 0.76rem;
}

.slot-winner.mine strong {
  color: #0a558c;
}

.slot-winner.claimed strong {
  color: #1d2330;
}

.slot-price {
  font-size: 1.1rem;
  font-weight: 600;
  color: #1a1a1a;
  margin-top: 2px;
}

td[data-clickable="true"] {
  cursor: pointer;
}

td[data-clickable="true"]:hover:not(.current-slot) {
  background: #e8f0ff !important;
  border-color: #3b82f6 !important;
}

td[data-clickable="true"].current-slot:hover {
  background: rgba(255, 152, 0, 0.08) !important;
}

td[data-clickable="true"]:hover .slot-price {
  color: #3b82f6;
}

.bidding-note {
  margin: 8px 0 0;
  font-size: 0.85rem;
  color: #384152;
}

.legend {
  display: flex;
  gap: 16px;
  margin-top: 8px;
  font-size: 0.9rem;
}

.chip {
  display: inline-block;
  width: 14px;
  height: 14px;
  border-radius: 4px;
  margin-right: 6px;
  vertical-align: middle;
  border: 1px solid rgba(0, 0, 0, 0.12);
}

.chip.mine { background: #dff3ff; border-color: #1d8bf1; }
.chip.outbid { background: #fff5e8; border-color: #f5a326; }
.chip.locked { background: #f0f3f8; border-color: #a0a8ba; }
.chip.reserved { background: #ffe3e3; border-color: #ff6b6b; }
.chip.slot-owner-using { background: #d4edda; border-color: #28a745; }
.chip.slot-owner-no-show { background: #fff3cd; border-color: #ffc107; }

/* Usage overlay for historical users and squatters */
.usage-overlay {
  font-size: 0.7rem;
  margin-top: 2px;
  padding: 2px 4px;
  border-radius: 3px;
  font-weight: 600;
}

.usage-overlay.historical {
  color: #888;
  font-style: italic;
  background: rgba(128, 128, 128, 0.1);
}

.usage-overlay.squatter {
  color: #dc3545;
  font-weight: 700;
  background: rgba(220, 53, 69, 0.1);
}

table {
  width: 100%;
  border-collapse: collapse;
}

table th,
table td {
  border: 1px solid #e4e8f3;
  padding: 4px 6px;
  text-align: left;
  font-size: 0.8rem;
  line-height: 1.3;
}

.admin-table {
  font-size: 0.82rem;
}

.admin-table input[type="number"] {
  width: 80px;
  margin-right: 4px;
}

.admin-table form {
  display: flex;
  flex-direction: column;
  gap: 4px;
  margin-bottom: 6px;
}

.admin-table form:last-of-type {
  margin-bottom: 0;
}

.admin-table form input,
.admin-table form select,
#createUserForm input,
#createUserForm select {
  padding: 6px;
  border-radius: 6px;
  border: 1px solid #d0d7ed;
  font-size: 0.85rem;
}

#createUserForm {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 8px;
  align-items: center;
}

#createUserForm button {
  grid-column: span 2;
}

.admin-table form button,
#createUserForm button {
  padding: 6px 10px;
  background: #333;
  color: #fff;
  border: none;
  border-radius: 4px;
  cursor: pointer;
  transition: background 0.2s ease;
}

.admin-table form button:hover,
#createUserForm button:hover {
  background: #555;
}

.admin-controls button {
  padding: 8px 14px;
  background: #333;
  color: #fff;
  border: none;
  border-radius: 4px;
  cursor: pointer;
  transition: background 0.2s ease;
}

.admin-controls button:hover {
  background: #555;
}

.login {
  max-width: 380px;
  margin: 100px auto;
  padding: 40px;
  background: #fff;
  border-radius: 8px;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
  border: 1px solid #e0e0e0;
  text-align: center;
}

.login h1 {
  margin: 0 0 8px;
  font-size: 1.75rem;
  font-weight: 600;
  color: #1a1a1a;
}

.login .subtitle {
  margin: 0 0 24px;
  font-size: 0.95rem;
  color: #666;
  font-weight: 400;
}

.login form {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-top: 16px;
}

.login input {
  padding: 10px 14px;
  border-radius: 4px;
  border: 1px solid #ccc;
  font-size: 1rem;
  transition: border-color 0.2s ease;
  background: #fff;
}

.login input:focus {
  outline: none;
  border-color: #333;
}

.login button {
  padding: 12px;
  border: none;
  background: #333;
  color: #fff;
  border-radius: 4px;
  font-size: 1rem;
  font-weight: 500;
  cursor: pointer;
  transition: background 0.2s ease;
}

.login button:hover {
  background: #555;
}

button {
  font: inherit;
}

.hint {
  font-size: 0.85rem;
  color: #5b6579;
  margin-top: 12px;
}

#loading-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.7);
  display: none;
  align-items: center;
  justify-content: center;
  z-index: 9999;
}

.loading-content {
  background: #fff;
  padding: 30px 40px;
  border-radius: 12px;
  text-align: center;
  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.3);
}

.loading-spinner {
  width: 40px;
  height: 40px;
  margin: 0 auto 16px;
  border: 4px solid #e0e0e0;
  border-top: 4px solid #333;
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

@keyframes spin {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}

.loading-message {
  font-size: 1rem;
  font-weight: 500;
  color: #333;
}

/* GPU Status Tiles - Login Page */
.login-gpu-tiles {
  display: flex;
  gap: 8px;
  justify-content: center;
  margin: 24px 0;
}

.gpu-tile {
  width: 32px;
  height: 32px;
  border: 2px solid #333;
  border-radius: 4px;
}

.gpu-tile.available {
  background: #fff;
}

.gpu-tile.occupied {
  background: #333;
}

/* GPU Status Tiles - Header */
.header-gpu-tiles {
  display: flex;
  gap: 12px;
  margin-top: 12px;
  flex-wrap: wrap;
}

.gpu-header-tile {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
}

.gpu-number {
  font-size: 0.75rem;
  color: #666;
  font-weight: 500;
}

.gpu-name {
  padding: 4px 8px;
  border: 1px solid #333;
  border-radius: 4px;
  font-size: 0.85rem;
  font-weight: 500;
  color: #1a1a1a;
  background: #fff;
  min-width: 60px;
  text-align: center;
  font-family: 'Monaco', 'Courier New', monospace;
}

@media (max-width: 960px) {
  .main {
    grid-template-columns: 1fr;
  }

  .panel,
  .sidebar {
    padding: 12px;
  }

  .slot {
    min-height: 64px;
  }
}