* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: #f4f6f8;
  color: #1f2937;
}

header,
footer {
  padding: 16px 20px;
  background: #0f766e;
  color: #fff;
}

header h1 {
  margin: 0 0 6px;
  font-size: 1.4rem;
}

header p,
footer small {
  margin: 0;
  opacity: 0.95;
}

.session-info {
  margin-top: 8px;
  font-size: 0.9rem;
}

main.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 14px;
  padding: 14px;
}

.card {
  background: #fff;
  border-radius: 10px;
  padding: 14px;
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.08);
}

.card.wide {
  grid-column: 1 / -1;
}

.two-col {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
  gap: 14px;
}

h3 {
  margin: 0 0 6px;
  font-size: 0.95rem;
}

h2 {
  margin-top: 0;
  font-size: 1.05rem;
}

form {
  display: grid;
  gap: 10px;
  margin-bottom: 12px;
}

.schedule-form {
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  align-items: end;
}

.button-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 10px;
}

label {
  display: grid;
  gap: 4px;
  font-size: 0.9rem;
}

input,
select,
button {
  font: inherit;
  font-size: 16px;
  padding: 10px;
  border-radius: 8px;
  border: 1px solid #cbd5e1;
  min-height: 44px;
}

textarea {
  width: 100%;
  font: inherit;
  padding: 10px;
  border-radius: 8px;
  border: 1px solid #cbd5e1;
  background: #f8fafc;
}

button {
  background: #0f766e;
  color: #fff;
  border: none;
  cursor: pointer;
}

button:hover {
  background: #0d655e;
}

.list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  gap: 8px;
}

.list li {
  background: #f8fafc;
  border: 1px solid #e2e8f0;
  border-radius: 8px;
  padding: 8px;
  display: flex;
  justify-content: space-between;
  gap: 10px;
  flex-wrap: wrap;
}

.list li span.meta {
  color: #475569;
  font-size: 0.86rem;
}

.badge {
  display: inline-block;
  padding: 2px 8px;
  border-radius: 999px;
  font-size: 0.78rem;
  font-weight: 600;
  margin: 0 3px;
}

.status-pending {
  background: #fff7ed;
  color: #9a3412;
}

.status-confirmed {
  background: #ecfdf5;
  color: #166534;
}

.status-requested {
  background: #fef2f2;
  color: #991b1b;
}

.delete {
  background: #b91c1c;
  padding: 5px 10px;
}

.confirm {
  background: #166534;
  padding: 5px 10px;
}

.confirm:hover {
  background: #14532d;
}

.request {
  background: #c2410c;
  padding: 5px 10px;
}

.request:hover {
  background: #9a3412;
}

.delete:hover {
  background: #991b1b;
}

.alert {
  min-height: 1.3em;
  margin: 0 0 10px;
  color: #b91c1c;
  font-size: 0.9rem;
}

.calendar-wrap {
  overflow-x: auto;
}

.calendar {
  width: 100%;
  border-collapse: collapse;
}

.calendar th,
.calendar td {
  border: 1px solid #e2e8f0;
  padding: 7px;
  vertical-align: top;
  min-width: 120px;
}

.calendar th {
  background: #f1f5f9;
}

.calendar .day {
  font-weight: 600;
  margin-bottom: 6px;
}

.calendar .events {
  display: grid;
  gap: 5px;
  font-size: 0.83rem;
}

@media (max-width: 640px) {
  header {
    padding: 12px 14px;
  }

  header h1 {
    font-size: 1.15rem;
  }

  header p {
    font-size: 0.85rem;
  }

  main.grid {
    grid-template-columns: 1fr;
    gap: 10px;
    padding: 10px;
  }

  .card {
    padding: 12px;
  }

  .two-col,
  .schedule-form {
    grid-template-columns: 1fr;
  }

  .list li {
    flex-direction: column;
    align-items: stretch;
  }

  .list li button {
    width: 100%;
  }

  .calendar th,
  .calendar td {
    min-width: 70px;
    padding: 5px;
    font-size: 0.78rem;
  }

  .badge {
    font-size: 0.72rem;
  }

  h2 {
    font-size: 1rem;
  }
}