:root {
  color-scheme: light;
  font-family: Arial, sans-serif;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: #fff;
  color: #111;
  min-height: 100vh;
}

#app {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.topbar {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  align-items: center;
  background: #f8f8f8;
  color: #333;
  padding: 0.75rem 1rem;
  border-bottom: 1px solid #e7e7e7;
}

.topbar h1 {
  margin: 0 0 0.25rem;
  font-size: 1.5rem;
}

.auth-summary {
  text-align: right;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.school-logo {
  height: 48px;
  width: auto;
  display: block;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.nav {
  display: flex;
  gap: 0.5rem;
  /* Keep the right-side sound button pinned right. Left side can wrap internally. */
  flex-wrap: nowrap;
  padding: 0.5rem 1rem;
  border-bottom: 1px solid #e7e7e7;
  background: #f8f8f8;
  align-items: center;
}

.nav-left {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
  align-items: center;
  flex: 1 1 auto;
  min-width: 0;
}

.nav-right {
  display: flex;
  align-items: center;
  flex: 0 0 auto;
}

.nav-link {
  border: 1px solid transparent;
  background: transparent;
  border-radius: 4px;
  padding: 0.35rem 0.65rem;
  cursor: pointer;
  color: #333;
}

.nav-link.active {
  background: #e7e7e7;
  border-color: #ddd;
}

.nav .sound-btn {
  white-space: nowrap;
  border: 1px solid #adadad;
  background: transparent;
  border-radius: 6px;
  padding: 0.35rem 0.8rem;
  font-weight: 700;
  cursor: pointer;
}

.nav .sound-btn:hover {
  background: #eef3f7;
}

.nav .sound-btn.enabled {
  background: #5cb85c;
  border-color: #4cae4c;
  color: #fff;
}

.main {
  max-width: 980px;
  margin: 1rem auto;
  padding: 0 1rem 2rem;
  flex: 1 1 auto;
  width: 100%;
}

.footer {
  border-top: 1px solid #e7e7e7;
  background: #f8f8f8;
  padding: 0.75rem 1rem;
  margin-top: auto;
}

.footer-hint {
  max-width: 980px;
  margin: 0 auto;
  padding: 0 1rem;
}

.card {
  background: #fff;
  border: 1px solid #ddd;
  border-radius: 4px;
  padding: 1rem;
}

.row {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
}

.stack {
  display: grid;
  gap: 0.65rem;
}

label {
  display: grid;
  gap: 0.35rem;
}

input, select, button {
  font: inherit;
}

input, select {
  border: 1px solid #cfd8dc;
  border-radius: 6px;
  padding: 0.55rem 0.6rem;
  background: #fff;
}

button {
  border: 1px solid #ccc;
  background: #fff;
  border-radius: 4px;
  padding: 0.5rem 0.8rem;
  cursor: pointer;
}

button:hover {
  background: #eef3f7;
}

.primary-btn {
  border: 1px solid #2e6da4;
  background: #337ab7;
  color: #fff;
  border-radius: 6px;
  padding: 0.65rem 0.9rem;
  font-weight: 700;
  min-height: 44px;
}

.primary-btn:hover {
  background: #2e6da4;
}

.primary-btn:disabled {
  opacity: 0.75;
  cursor: default;
}

table {
  width: 100%;
  border-collapse: collapse;
}

th, td {
  border-bottom: 1px solid #e4e8ec;
  text-align: left;
  padding: 0.55rem 0.35rem;
}

.notice {
  border-radius: 6px;
  padding: 0.65rem 0.85rem;
  margin-bottom: 0.8rem;
}

.notice.success {
  background: #e8f5e9;
  border: 1px solid #a5d6a7;
}

.notice.error {
  background: #ffebee;
  border: 1px solid #ef9a9a;
}

.banner {
  border-radius: 6px;
  padding: 0.75rem 0.9rem;
  margin: 0.75rem 0;
  font-weight: 700;
}

.banner-danger {
  background: #ffebee;
  border: 1px solid #ef9a9a;
  color: #b71c1c;
}

.campus-toggle {
  display: flex;
  border: 1px solid #cfd8dc;
  border-radius: 10px;
  overflow: hidden;
}

.campus-toggle-btn {
  flex: 1 1 0;
  border: 0;
  border-right: 1px solid #cfd8dc;
  background: #fff;
  padding: 0.75rem 0.9rem;
  font-weight: 800;
  cursor: pointer;
}

.campus-toggle-btn:last-child {
  border-right: 0;
}

.campus-toggle-btn:hover {
  background: #eef3f7;
}

.campus-toggle-btn.selected {
  background: #337ab7;
  color: #fff;
}

.muted {
  color: #607d8b;
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 0.6rem;
}

.legacy-shell {
  background: #fff;
}

.legacy-title {
  margin-top: 0.25rem;
  margin-bottom: 0.75rem;
}

.legacy-btn {
  border-color: #ccc;
}

.caller-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.75rem;
}

.caller-bus-btn {
  min-height: 76px;
  width: 100%;
  border: 1px solid #adadad;
  background: #fff;
}

.caller-bus-btn.wide {
  grid-column: 1 / -1;
}

.caller-bus-btn span {
  font-size: 2rem;
  font-weight: 600;
  line-height: 1;
}

.caller-bus-btn.is-here {
  background: #5cb85c;
  color: #fff;
  border-color: #4cae4c;
}

.caller-special {
  margin-top: 1rem;
}

.caller-bus-btn.all-buses {
  min-height: 80px;
}

.caller-clear {
  margin-top: 1rem;
}

.caller-clear-btn {
  width: 100%;
  min-height: 64px;
  font-size: 1.6rem;
  background: #d9534f;
  color: #fff;
  border-color: #d43f3a;
}

.classroom-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 10px;
}

.classroom-controls {
  margin-bottom: 12px;
}


.classroom-bus-card {
  border: 1px solid #4cae4c;
  background: #fff;
  color: #111;
  padding: 0.85rem 1rem;
  border-radius: 8px;
  text-align: center;
}

.classroom-bus-card.fresh {
  animation: classroomFadeToHollow 10s linear forwards;
}

@keyframes classroomFadeToHollow {
  0% {
    background: #5cb85c;
    border-color: #4cae4c;
    color: #111;
  }
  100% {
    background: #fff;
    border-color: #4cae4c;
    color: #111;
  }
}

.classroom-bus-number {
  font-size: 24px;
  font-weight: 700;
  line-height: 1;
}

.classroom-kids {
  margin-top: 0.3rem;
  font-size: 12px;
  line-height: 1.2;
}

@media (max-width: 900px) {
  .caller-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 620px) {
  .caller-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 0.6rem;
  }
  .caller-bus-btn span {
    font-size: 1.4rem;
  }
  .caller-bus-btn {
    min-height: 62px;
  }
  .classroom-bus-number {
    font-size: 22px;
  }
}

.split {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1rem;
  margin-bottom: 1rem;
}

code {
  background: #eef1f4;
  padding: 0.1rem 0.25rem;
  border-radius: 4px;
}