:root {
  color-scheme: light;
  --bg: #f6f8fb;
  --panel: #ffffff;
  --ink: #102033;
  --muted: #637083;
  --line: #dbe3ee;
  --brand: #0a7f83;
  --brand-dark: #075f62;
  --warn: #9a5b00;
  --good: #147248;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

* { box-sizing: border-box; }
body { margin: 0; color: var(--ink); background: var(--bg); }
button, input, textarea { font: inherit; }
button {
  border: 1px solid var(--line);
  background: #fff;
  color: var(--ink);
  border-radius: 8px;
  padding: 10px 14px;
  cursor: pointer;
}
button:disabled { opacity: .55; cursor: not-allowed; }
.primary { background: var(--brand); border-color: var(--brand); color: #fff; }
.ghost { background: transparent; }

.shell { min-height: 100vh; display: grid; grid-template-columns: 250px 1fr; }
.sidebar {
  background: #0f2433;
  color: #fff;
  padding: 22px;
  display: flex;
  flex-direction: column;
  gap: 22px;
}
.brand { display: grid; gap: 2px; }
.brand span { color: #9dcbd0; }
.brand strong { font-size: 30px; }
nav { display: grid; gap: 8px; }
.nav {
  text-align: left;
  background: transparent;
  color: #d9e8ef;
  border-color: rgba(255,255,255,.14);
}
.nav.active { background: #17384e; color: #fff; }
.content { padding: 24px; min-width: 0; }

.login-card {
  max-width: 460px;
  margin: 8vh auto;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 26px;
  display: grid;
  gap: 16px;
}
.login-card p, .topbar p { margin: 0; color: var(--muted); }
.login-card h1, .topbar h1 { margin: 4px 0 0; }

label { display: grid; gap: 7px; color: var(--muted); }
input, textarea {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 10px 12px;
  color: var(--ink);
  background: #fff;
}
textarea { min-height: 84px; resize: vertical; }

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 18px;
}
.top-actions { display: flex; gap: 10px; flex-wrap: wrap; }
.view { display: none; }
.view.active { display: grid; gap: 18px; }
.panel {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 18px;
}
.panel-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  margin-bottom: 14px;
}
.panel-head h2 { margin: 0; }
.metrics {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 12px;
}
.metrics article {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 16px;
  display: grid;
  gap: 8px;
}
.metrics span, .card span { color: var(--muted); }
.metrics strong { font-size: 24px; }
.cards { display: grid; gap: 12px; }
.card {
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 14px;
  background: #fff;
  display: grid;
  gap: 10px;
}
.card-head {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  align-items: start;
}
.card h3 { margin: 0; }
.card-actions { display: flex; gap: 8px; flex-wrap: wrap; }
.pill {
  display: inline-flex;
  align-items: center;
  border-radius: 999px;
  padding: 4px 10px;
  background: #edf4f5;
  color: var(--brand-dark);
  font-size: 13px;
}
.pill.warn { background: #fff6e7; color: var(--warn); }
.pill.good { background: #eaf8f1; color: var(--good); }
.timeline { display: grid; gap: 12px; }
.session-card {
  border-left: 4px solid var(--brand);
  background: #fff;
  border-radius: 10px;
  padding: 14px;
  display: grid;
  gap: 10px;
}
.form-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}
.form-grid .panel-head, .wide { grid-column: 1 / -1; }
.rules { display: grid; gap: 10px; counter-reset: item; }
.rule {
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 12px;
  background: #fff;
}
.policy-box { margin-top: 18px; display: grid; gap: 12px; }
.notice { color: var(--brand-dark); min-height: 22px; white-space: pre-wrap; }
.empty { color: var(--muted); padding: 12px; border: 1px dashed var(--line); border-radius: 8px; }
a { color: var(--brand-dark); }

@media (max-width: 860px) {
  .shell { grid-template-columns: 1fr; }
  .sidebar {
    position: sticky;
    top: 0;
    z-index: 2;
    padding: 14px;
  }
  .brand { display: flex; align-items: baseline; gap: 8px; }
  .brand strong { font-size: 22px; }
  nav { display: flex; overflow-x: auto; padding-bottom: 3px; }
  .nav { white-space: nowrap; }
  .content { padding: 14px; }
  .topbar, .panel-head, .card-head { align-items: stretch; flex-direction: column; }
  .metrics { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .form-grid { grid-template-columns: 1fr; }
}

@media (max-width: 520px) {
  .metrics { grid-template-columns: 1fr; }
  .card-actions, .top-actions { display: grid; }
}