:root {
  --bg: #f4f6f9;
  --surface: #ffffff;
  --border: #e2e6ec;
  --text: #1c2530;
  --text-muted: #6b7686;
  --accent: #2563eb;
  --accent-light: #dbeafe;
  --sidebar-bg: #111827;
  --sidebar-text: #cbd5e1;
  --sidebar-text-active: #ffffff;
  --sidebar-active-bg: #1f2937;
  --green: #16a34a;
  --green-bg: #dcfce7;
  --amber: #d97706;
  --amber-bg: #fef3c7;
  --red: #dc2626;
  --red-bg: #fee2e2;
  --gray: #6b7280;
  --gray-bg: #e5e7eb;
  --radius: 10px;
  --shadow: 0 1px 2px rgba(16, 24, 40, 0.06), 0 1px 3px rgba(16, 24, 40, 0.08);
}

* {
  box-sizing: border-box;
}

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--text);
  font-family: "Segoe UI", "Noto Sans", Arial, sans-serif;
  font-size: 14px;
  line-height: 1.45;
}

a {
  color: inherit;
  text-decoration: none;
}

.app-shell {
  display: flex;
  min-height: 100vh;
}

/* ---------- Sidebar ---------- */
.sidebar {
  width: 220px;
  flex-shrink: 0;
  background: var(--sidebar-bg);
  color: var(--sidebar-text);
  padding: 18px 12px;
  position: sticky;
  top: 0;
  height: 100vh;
  overflow-y: auto;
}

.sidebar .brand {
  font-size: 15px;
  font-weight: 700;
  color: #fff;
  padding: 6px 10px 18px;
  border-bottom: 1px solid #1f2937;
  margin-bottom: 10px;
}

.sidebar .brand small {
  display: block;
  font-weight: 400;
  color: var(--sidebar-text);
  font-size: 11px;
  margin-top: 2px;
}

.sidebar nav a {
  display: block;
  padding: 9px 10px;
  border-radius: 8px;
  font-size: 13.5px;
  margin-bottom: 2px;
  color: var(--sidebar-text);
}

.sidebar nav a:hover {
  background: #1a2333;
  color: #fff;
}

.sidebar nav a.active {
  background: var(--sidebar-active-bg);
  color: var(--sidebar-text-active);
  font-weight: 600;
}

.user-box {
  margin-top: 18px;
  padding: 12px 10px 4px;
  border-top: 1px solid #1f2937;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
}

.user-box .user-name {
  font-size: 12.5px;
  color: #e5e7eb;
  font-weight: 600;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.user-box a {
  font-size: 11.5px;
  color: #93a3b8;
  flex-shrink: 0;
}

.user-box a:hover {
  color: #fff;
  text-decoration: underline;
}

/* ---------- Main content ---------- */
.main {
  flex: 1;
  min-width: 0;
  padding: 24px 28px 60px;
}

.page-header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 18px;
}

.page-header h1 {
  font-size: 20px;
  margin: 0;
}

.page-header .subtitle {
  color: var(--text-muted);
  font-size: 13px;
}

/* ---------- KPI cards ---------- */
.kpi-row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(170px, 1fr));
  gap: 14px;
  margin-bottom: 22px;
}

.kpi-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px 18px;
  box-shadow: var(--shadow);
}

.kpi-card .label {
  font-size: 12px;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.03em;
  margin-bottom: 6px;
}

.kpi-card .value {
  font-size: 24px;
  font-weight: 700;
}

.kpi-card .sub {
  font-size: 12px;
  color: var(--text-muted);
  margin-top: 4px;
}

/* ---------- Cards / panels ---------- */
.panel {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 18px 20px;
  margin-bottom: 20px;
}

.panel h2 {
  font-size: 15px;
  margin: 0 0 14px;
}

.panel-grid {
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: 20px;
}

@media (max-width: 900px) {
  .panel-grid { grid-template-columns: 1fr; }
}

/* ---------- Toolbar (search/filter row above tables) ---------- */
.toolbar {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
  margin-bottom: 14px;
}

.toolbar input[type="search"],
.toolbar input[type="text"],
.toolbar select {
  padding: 7px 10px;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 13px;
  background: var(--surface);
  color: var(--text);
}

.toolbar input[type="search"] {
  min-width: 220px;
}

.toolbar .spacer { flex: 1; }

.toolbar .result-count {
  font-size: 12.5px;
  color: var(--text-muted);
}

/* ---------- Tables ---------- */
.table-wrap {
  overflow-x: auto;
  overflow-y: auto;
  max-height: calc(100vh - 260px);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
}

table.data-table {
  border-collapse: collapse;
  width: 100%;
  font-size: 13px;
  white-space: nowrap;
}

table.data-table th,
table.data-table td {
  padding: 8px 12px;
  border-bottom: 1px solid var(--border);
  text-align: left;
}

table.data-table thead th {
  position: sticky;
  top: 0;
  background: #f9fafb;
  color: var(--text-muted);
  font-weight: 600;
  font-size: 11.5px;
  text-transform: uppercase;
  letter-spacing: 0.02em;
  cursor: pointer;
  user-select: none;
  white-space: nowrap;
}

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

table.data-table thead th.sorted::after {
  content: " " attr(data-dir);
  font-size: 10px;
}

table.data-table tbody tr:hover {
  background: #f9fafb;
}

table.data-table td.editable {
  cursor: text;
}

table.data-table td.editable:hover {
  background: var(--accent-light);
}

table.data-table td input[type="text"],
table.data-table td select {
  width: 100%;
  padding: 4px 6px;
  border: 1px solid var(--accent);
  border-radius: 5px;
  font-size: 13px;
  font-family: inherit;
}

table.data-table td input[type="checkbox"] {
  width: 16px;
  height: 16px;
  cursor: pointer;
}

.cell-saving { opacity: 0.5; }
.cell-saved { animation: flash-saved 900ms ease-out; }
.cell-error { outline: 2px solid var(--red); }

@keyframes flash-saved {
  from { background: var(--green-bg); }
  to { background: transparent; }
}

/* ---------- Buffered edit / save workflow ---------- */
table.data-table td.cell-dirty {
  background: var(--amber-bg);
  box-shadow: inset 3px 0 0 var(--amber);
}

table.data-table tr.row-dirty {
  background: #fffbeb;
}

table.data-table tr.row-dirty:hover {
  background: #fef3c7;
}

.row-actions {
  display: flex;
  gap: 6px;
  white-space: nowrap;
}

.btn-save-row, .btn-cancel-row {
  padding: 4px 9px;
  border-radius: 6px;
  font-size: 11.5px;
  font-weight: 600;
  border: 1px solid transparent;
  cursor: pointer;
}

.btn-save-row {
  background: var(--accent);
  color: #fff;
}

.btn-save-row:hover { background: #1d4ed8; }
.btn-save-row:disabled { opacity: 0.6; cursor: not-allowed; }

.btn-cancel-row {
  background: var(--surface);
  color: var(--text-muted);
  border-color: var(--border);
}

.btn-cancel-row:hover { color: var(--text); }

.row-clean {
  color: var(--border);
  font-size: 12px;
}

.save-bar {
  display: none;
  align-items: center;
  gap: 12px;
  background: var(--amber-bg);
  border: 1px solid var(--amber);
  color: #92400e;
  border-radius: 8px;
  padding: 9px 14px;
  margin-bottom: 12px;
  font-size: 13px;
  font-weight: 600;
}

.save-bar.visible { display: flex; }

.save-bar button {
  padding: 6px 14px;
  border-radius: 6px;
  font-size: 12.5px;
  font-weight: 600;
  cursor: pointer;
  border: 1px solid transparent;
}

.save-bar .btn-save-all {
  background: var(--amber);
  color: #fff;
}

.save-bar .btn-cancel-all {
  background: transparent;
  color: #92400e;
  border-color: var(--amber);
}

.live-indicator {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  font-size: 11.5px;
  color: var(--text-muted);
}

.live-indicator .dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--green);
  animation: pulse-dot 2s ease-in-out infinite;
}

@keyframes pulse-dot {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.35; }
}

.updated-at {
  font-size: 11px;
  color: var(--text-muted);
}

/* ---------- Badges ---------- */
.badge {
  display: inline-block;
  padding: 2px 9px;
  border-radius: 999px;
  font-size: 11.5px;
  font-weight: 600;
  white-space: nowrap;
}

.badge-green { background: var(--green-bg); color: var(--green); }
.badge-amber { background: var(--amber-bg); color: var(--amber); }
.badge-red { background: var(--red-bg); color: var(--red); }
.badge-gray { background: var(--gray-bg); color: var(--gray); }
.badge-blue { background: var(--accent-light); color: var(--accent); }

/* ---------- Calendar strip ---------- */
.calendar-strip {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding-bottom: 6px;
}

.cal-day {
  flex: 0 0 auto;
  width: 108px;
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 10px;
  text-align: center;
  background: var(--surface);
}

.cal-day .date {
  font-weight: 700;
  font-size: 13px;
}

.cal-day .dayname {
  font-size: 11px;
  color: var(--text-muted);
  margin-bottom: 6px;
}

.cal-day .textbooks {
  font-size: 12px;
  margin-top: 6px;
  color: var(--text-muted);
}

.cal-day.off {
  opacity: 0.55;
}

/* ---------- Risk list ---------- */
.risk-item {
  padding: 10px 0;
  border-bottom: 1px solid var(--border);
}

.risk-item:last-child { border-bottom: none; }

.risk-item .risk-desc {
  font-size: 13px;
  margin-top: 4px;
}

.risk-item .risk-meta {
  font-size: 11.5px;
  color: var(--text-muted);
  margin-top: 3px;
}

/* ---------- Progress bar ---------- */
.progress-bar {
  width: 100%;
  height: 8px;
  background: var(--gray-bg);
  border-radius: 999px;
  overflow: hidden;
}

.progress-bar .fill {
  height: 100%;
  background: var(--accent);
  border-radius: 999px;
}

/* ---------- Misc ---------- */
.loading, .empty-state {
  padding: 30px;
  text-align: center;
  color: var(--text-muted);
  font-size: 13px;
}

.error-banner {
  background: var(--red-bg);
  color: var(--red);
  padding: 10px 14px;
  border-radius: 8px;
  margin-bottom: 14px;
  font-size: 13px;
}

.pagination {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-top: 12px;
  font-size: 13px;
}

.pagination button {
  padding: 5px 10px;
  border: 1px solid var(--border);
  background: var(--surface);
  border-radius: 6px;
  cursor: pointer;
}

.pagination button:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}