:root {
  --bg: #f4f5f7;
  --card: #ffffff;
  --text: #1f2328;
  --muted: #5f6b7a;
  --border: #e3e6ea;
  --accent: #1a73e8;
  --accent-soft: #e8f0fe;
  --danger: #c5221f;
  --ok: #188038;
  color-scheme: light dark;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #111418;
    --card: #1b1f24;
    --text: #e6e8eb;
    --muted: #9aa4b1;
    --border: #2d333b;
    --accent: #8ab4f8;
    --accent-soft: #1e2a3d;
    --danger: #f28b82;
    --ok: #81c995;
  }
}

* { box-sizing: border-box; }
[hidden] { display: none !important; }

body {
  margin: 0;
  min-height: 100vh;
  display: flex;
  align-items: flex-start;
  justify-content: center;
  padding: 40px 16px;
  background: var(--bg);
  color: var(--text);
  font: 15px/1.5 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}

.card {
  display: grid;
  grid-template-columns: 280px 1fr;
  width: 100%;
  max-width: 980px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  box-shadow: 0 1px 3px rgb(0 0 0 / 6%);
  overflow: hidden;
}

.summary {
  padding: 28px 24px;
  border-right: 1px solid var(--border);
}

.organizer { color: var(--muted); margin: 0 0 4px; font-weight: 500; }
h1 { font-size: 24px; margin: 0 0 16px; line-height: 1.25; }
h2 { font-size: 19px; margin: 0 0 20px; }
h3 { font-size: 15px; margin: 0 0 12px; font-weight: 500; }

.meta { list-style: none; padding: 0; margin: 0 0 16px; color: var(--muted); }
.meta li { display: flex; gap: 10px; margin-bottom: 8px; font-weight: 500; }
.meta .icon { width: 20px; text-align: center; }
#chosen { color: var(--ok); }
.intro { color: var(--muted); white-space: pre-line; margin: 0; }

.panel { padding: 28px; min-height: 480px; }

.picker { display: flex; gap: 28px; }
.calendar { flex: 1; min-width: 0; max-width: 400px; }

.cal-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 12px;
  font-weight: 600;
}

.nav {
  width: 36px;
  height: 36px;
  border: none;
  border-radius: 50%;
  background: var(--accent-soft);
  color: var(--accent);
  font-size: 20px;
  cursor: pointer;
}
.nav:disabled { background: transparent; color: var(--border); cursor: default; }

.cal-grid { display: grid; grid-template-columns: repeat(7, 1fr); gap: 4px; }
.weekdays span { text-align: center; font-size: 12px; color: var(--muted); padding: 4px 0; }

.day {
  aspect-ratio: 1;
  border: none;
  border-radius: 50%;
  background: transparent;
  color: var(--muted);
  font: inherit;
  opacity: 0.55;
}
.day.available {
  background: var(--accent-soft);
  color: var(--accent);
  font-weight: 600;
  opacity: 1;
  cursor: pointer;
}
.day.available:hover { outline: 2px solid var(--accent); }
.day.selected { background: var(--accent); color: var(--card); }
.day.today { text-decoration: underline; text-underline-offset: 3px; }

.tz { font-size: 13px; color: var(--muted); margin-top: 16px; }

.times { width: 200px; }
.time-list { display: flex; flex-direction: column; gap: 8px; max-height: 380px; overflow-y: auto; padding-right: 4px; }

.time {
  padding: 12px;
  border: 1px solid var(--accent);
  border-radius: 6px;
  background: transparent;
  color: var(--accent);
  font: inherit;
  font-weight: 600;
  cursor: pointer;
}
.time:hover { background: var(--accent-soft); }

.status { color: var(--muted); min-height: 1.5em; }

#step-form, .lock { max-width: 480px; }
.hint { color: var(--muted); margin: -8px 0 20px; }
#step-form label, .lock label { display: block; font-weight: 500; margin-bottom: 14px; font-size: 14px; }
form .row { display: flex; gap: 12px; }
form .row label { flex: 1; }

input, textarea {
  display: block;
  width: 100%;
  margin-top: 4px;
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--card);
  color: var(--text);
  font: inherit;
}
input:focus, textarea:focus { outline: 2px solid var(--accent); border-color: transparent; }

.hp { position: absolute; left: -10000px; }

.back {
  border: none;
  background: none;
  color: var(--accent);
  font: inherit;
  padding: 0;
  margin-bottom: 16px;
  cursor: pointer;
}

.primary {
  padding: 12px 24px;
  border: none;
  border-radius: 24px;
  background: var(--accent);
  color: var(--card);
  font: inherit;
  font-weight: 600;
  cursor: pointer;
}
.primary:disabled { opacity: 0.6; cursor: progress; }

.error { color: var(--danger); min-height: 1.5em; margin: 0 0 8px; }

.done { text-align: center; padding-top: 40px; }
.done-check {
  width: 56px;
  height: 56px;
  margin: 0 auto 16px;
  border-radius: 50%;
  background: var(--ok);
  color: var(--card);
  font-size: 30px;
  line-height: 56px;
}
.done a { color: var(--accent); font-weight: 600; }

@media (max-width: 760px) {
  body { padding: 0; }
  .card { grid-template-columns: 1fr; border-radius: 0; border: none; }
  .summary { border-right: none; border-bottom: 1px solid var(--border); padding: 20px 16px; }
  .panel { padding: 20px 16px; min-height: 0; }
  .picker { flex-direction: column; }
  .calendar { max-width: none; }
  .times { width: auto; }
  .time-list { max-height: none; display: grid; grid-template-columns: repeat(auto-fill, minmax(90px, 1fr)); }
  form .row { flex-direction: column; gap: 0; }
}