:root {
  --bg: #f3f4f6;
  --surface: #ffffff;
  --ink: #1f2937;
  --muted: #6b7280;
  --accent: #059669;
  --danger: #dc2626;
  --border: #d1d5db;
}

* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: "Segoe UI", Tahoma, sans-serif;
  color: var(--ink);
  background: linear-gradient(160deg, #f9fafb 0%, #e5e7eb 100%);
}

.topbar {
  height: 60px;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 20px;
}

.brand {
  font-weight: 700;
  letter-spacing: 0.5px;
}

.layout {
  display: grid;
  grid-template-columns: 240px 1fr;
  min-height: calc(100vh - 60px);
}

.sidebar {
  border-right: 1px solid var(--border);
  background: #f8fafc;
  padding: 12px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.sidebar a {
  text-decoration: none;
  color: var(--ink);
  padding: 10px;
  border-radius: 8px;
}

.sidebar a:hover {
  background: #e2e8f0;
}

.content {
  padding: 20px;
}

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 14px;
  margin-bottom: 14px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(120px, 1fr));
  gap: 12px;
}

.btn {
  border: 1px solid #047857;
  background: var(--accent);
  color: #fff;
  border-radius: 8px;
  padding: 8px 12px;
  cursor: pointer;
}

.btn.danger {
  background: var(--danger);
  border-color: #b91c1c;
}

input, textarea, select {
  width: 100%;
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 8px;
  font: inherit;
}

table {
  width: 100%;
  border-collapse: collapse;
  background: var(--surface);
  border: 1px solid var(--border);
}

th, td {
  border-bottom: 1px solid var(--border);
  padding: 8px;
  text-align: left;
  vertical-align: top;
}

.inline {
  display: inline-flex;
  gap: 6px;
  margin: 2px 0;
}

.tabs {
  margin-bottom: 12px;
  display: flex;
  gap: 10px;
}

.tabs a {
  text-decoration: none;
  color: #065f46;
}

.days-grid {
  display: grid;
  grid-template-columns: repeat(7, minmax(40px, 1fr));
  gap: 8px;
}

.day-chip {
  text-decoration: none;
  text-align: center;
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 8px 0;
  color: var(--ink);
  background: #f8fafc;
}

.day-chip.filled {
  background: #ecfdf5;
  border-color: #10b981;
}

.day-chip.active {
  border-color: #047857;
  box-shadow: 0 0 0 2px #a7f3d0 inset;
  font-weight: 600;
}

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

.login-body {
  min-height: 100vh;
  display: grid;
  place-items: center;
}

.login-card {
  width: min(92vw, 360px);
}

.error {
  color: var(--danger);
}

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

  .sidebar {
    border-right: none;
    border-bottom: 1px solid var(--border);
    flex-direction: row;
    overflow-x: auto;
  }
}