:root {
  color-scheme: light;
  --bg: #f4f6f3;
  --surface: #ffffff;
  --ink: #151d1a;
  --muted: #68736d;
  --line: #d9dfd8;
  --green: #2f6f52;
  --green-dark: #204d3a;
  --coral: #c9634a;
  --amber: #a46a15;
  --red: #b73f36;
  --blue: #2f5d86;
  --shadow: 0 16px 40px rgba(25, 36, 31, 0.08);
  --radius: 8px;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  background: var(--bg);
  color: var(--ink);
}

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

button {
  cursor: pointer;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 24px clamp(18px, 4vw, 52px) 16px;
}

.brand {
  margin: 0 0 6px;
  color: var(--green);
  font-size: 0.8rem;
  font-weight: 780;
  letter-spacing: 0;
  text-transform: uppercase;
}

h1,
h2,
p {
  margin-top: 0;
}

h1 {
  margin-bottom: 0;
  font-size: clamp(2rem, 4vw, 3.2rem);
  line-height: 1.02;
  letter-spacing: 0;
}

h2 {
  margin-bottom: 4px;
  font-size: 1.05rem;
}

.top-actions {
  display: flex;
  gap: 10px;
}

.admin-shell {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 300px;
  gap: 18px;
  padding: 0 clamp(18px, 4vw, 52px) 40px;
}

.metrics {
  grid-column: 1 / -1;
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 12px;
}

.metrics article,
.panel,
.activity-panel {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.metrics article {
  padding: 14px;
}

.metrics span {
  display: block;
  margin-bottom: 8px;
  color: var(--muted);
  font-size: 0.82rem;
  font-weight: 700;
}

.metrics strong {
  font-size: 1.8rem;
  line-height: 1;
}

.work-area {
  min-width: 0;
}

.tabs {
  display: flex;
  gap: 8px;
  margin-bottom: 10px;
}

.tab {
  min-height: 38px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 0 14px;
  background: #fff;
  color: var(--muted);
  font-weight: 760;
}

.tab.active {
  background: var(--ink);
  border-color: var(--ink);
  color: #fff;
}

.panel,
.activity-panel {
  padding: 16px;
}

.panel-heading {
  display: flex;
  align-items: start;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 14px;
}

.panel-heading p {
  margin-bottom: 0;
  color: var(--muted);
  font-size: 0.9rem;
}

.filters {
  display: grid;
  grid-template-columns: 220px minmax(220px, 1fr);
  gap: 10px;
  margin-bottom: 14px;
}

label {
  display: grid;
  gap: 6px;
  color: var(--muted);
  font-size: 0.82rem;
  font-weight: 700;
}

input,
select,
textarea {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 10px 11px;
  background: #fff;
  color: var(--ink);
  outline: none;
}

input:focus,
select:focus,
textarea:focus {
  border-color: var(--green);
  box-shadow: 0 0 0 3px rgba(47, 111, 82, 0.13);
}

.table-wrap {
  overflow: auto;
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

table {
  width: 100%;
  border-collapse: collapse;
  min-width: 860px;
  background: #fff;
}

th,
td {
  padding: 11px 12px;
  border-bottom: 1px solid var(--line);
  text-align: left;
  vertical-align: top;
}

th {
  background: #f8faf7;
  color: var(--muted);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0;
}

td {
  font-size: 0.9rem;
}

tbody tr:last-child td {
  border-bottom: 0;
}

.subtext {
  display: block;
  margin-top: 3px;
  color: var(--muted);
  font-size: 0.8rem;
}

.badge {
  display: inline-flex;
  align-items: center;
  min-height: 24px;
  border-radius: 999px;
  padding: 3px 8px;
  background: #eef3f0;
  color: var(--green-dark);
  font-size: 0.75rem;
  font-weight: 780;
  white-space: nowrap;
}

.badge.confirmed {
  background: #e6f4eb;
  color: var(--green-dark);
}

.badge.pending_manual_review {
  background: #fff5df;
  color: var(--amber);
}

.badge.pending_payment {
  background: #e8f0f8;
  color: var(--blue);
}

.badge.cancelled,
.badge.expired {
  background: #fae9e7;
  color: var(--red);
}

.row-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.primary-button,
.secondary-button,
.ghost-button,
.danger-button {
  border-radius: var(--radius);
  min-height: 38px;
  padding: 0 12px;
  font-weight: 760;
}

.primary-button {
  border: 0;
  background: var(--green);
  color: #fff;
}

.primary-button:hover {
  background: var(--green-dark);
}

.secondary-button,
.ghost-button,
.danger-button {
  background: #fff;
  color: var(--ink);
  border: 1px solid var(--line);
}

.ghost-button {
  width: 48px;
}

.danger-button {
  color: var(--red);
}

.class-form {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 10px;
  margin-bottom: 16px;
  padding: 14px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #fbfcfb;
}

.class-form .wide {
  grid-column: span 2;
}

.class-form button {
  align-self: end;
}

.class-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
}

.class-card {
  display: grid;
  gap: 8px;
  padding: 13px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.class-card strong {
  font-size: 0.98rem;
}

.class-card span {
  color: var(--muted);
  font-size: 0.86rem;
}

.capacity-bar {
  height: 8px;
  overflow: hidden;
  border-radius: 999px;
  background: #edf1ec;
}

.capacity-bar div {
  height: 100%;
  background: var(--green);
}

.activity-panel {
  position: sticky;
  top: 16px;
  align-self: start;
}

.status-message {
  min-height: 48px;
  margin: 12px 0;
  padding: 12px;
  border-radius: var(--radius);
  background: #f8faf7;
  color: var(--muted);
  font-size: 0.9rem;
}

.access-note {
  display: grid;
  gap: 4px;
  padding-top: 12px;
  border-top: 1px solid var(--line);
}

.access-note span {
  color: var(--muted);
  font-size: 0.84rem;
}

.hidden {
  display: none;
}

dialog {
  width: min(460px, calc(100% - 28px));
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

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

menu {
  display: flex;
  justify-content: end;
  gap: 10px;
  margin: 0;
  padding: 0;
}

@media (max-width: 1100px) {
  .admin-shell {
    grid-template-columns: 1fr;
  }

  .activity-panel {
    position: static;
  }
}

@media (max-width: 820px) {
  .topbar {
    align-items: start;
    flex-direction: column;
  }

  .metrics,
  .class-form,
  .class-grid,
  .filters {
    grid-template-columns: 1fr;
  }

  .class-form .wide {
    grid-column: auto;
  }
}