:root {
  color-scheme: light dark;
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --bg: #f4f6f8;
  --card: #ffffff;
  --text: #17202a;
  --muted: #667085;
  --border: #d0d5dd;
  --primary: #2456d6;
  --primary-text: #ffffff;
  --error: #b42318;
  --ok: #027a48;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #101828;
    --card: #1d2939;
    --text: #f9fafb;
    --muted: #98a2b3;
    --border: #344054;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
}

.app-header,
footer {
  max-width: 1100px;
  margin: 0 auto;
  padding: 1.5rem;
}

.app-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

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

.layout {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 1.5rem 1.5rem;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
}

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 1rem;
  padding: 1rem;
  box-shadow: 0 8px 24px rgb(16 24 40 / 8%);
}

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

label {
  display: block;
  margin-bottom: 0.85rem;
  font-weight: 650;
}

input,
select,
button {
  width: 100%;
  margin-top: 0.3rem;
  padding: 0.7rem 0.8rem;
  border-radius: 0.6rem;
  border: 1px solid var(--border);
  font: inherit;
}

button {
  border: 0;
  background: var(--primary);
  color: var(--primary-text);
  cursor: pointer;
  font-weight: 700;
}

button.secondary {
  background: transparent;
  color: var(--text);
  border: 1px solid var(--border);
}

.button-row {
  display: flex;
  gap: 0.6rem;
}

.hint,
.empty {
  color: var(--muted);
}

.state {
  padding: 0.5rem 0.7rem;
  border-radius: 0.6rem;
  background: rgb(102 112 133 / 12%);
}

.state.ok { color: var(--ok); }
.state.error { color: var(--error); }

.error-box {
  margin-bottom: 1rem;
  padding: 0.8rem;
  border: 1px solid var(--error);
  border-radius: 0.6rem;
  color: var(--error);
}

.hidden { display: none; }

.section-title-row {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  align-items: baseline;
}

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

th,
td {
  text-align: left;
  padding: 0.75rem;
  border-bottom: 1px solid var(--border);
}

.status {
  display: inline-block;
  padding: 0.25rem 0.5rem;
  border-radius: 999px;
  background: rgb(102 112 133 / 14%);
  white-space: nowrap;
}

.status-available { color: var(--ok); }
.status-busy,
.status-meeting { color: var(--error); }

@media (max-width: 800px) {
  .layout { grid-template-columns: 1fr; }
  .app-header { align-items: stretch; flex-direction: column; }
  .section-title-row { flex-direction: column; }
  table { display: block; overflow-x: auto; }
}


.countdown {
  font-weight: 800;
  color: var(--ok);
}

.countdown-urgent {
  color: var(--error);
}

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