:root {
  --bg: #fafafa;
  --surface: #ffffff;
  --surface-2: #f3f3f3;
  --ink: #111111;
  --ink-2: #555555;
  --ink-3: #999999;
  --line: #e6e6e6;
  --accent: #111111;
  --accent-2: #333333;
  --busy: #111111;
  --off: #b13b3b;
  --good: #2f7a3a;
  --danger: #b13b3b;
  --shadow: 0 1px 2px rgba(0,0,0,.03), 0 4px 16px rgba(0,0,0,.05);
  --radius: 8px;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Inter",
               "Segoe UI", Roboto, system-ui, sans-serif;
  font-size: 16px;
  line-height: 1.4;
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; text-decoration: none; }
button { font: inherit; cursor: pointer; }

main {
  max-width: 980px;
  margin: 0 auto;
  padding: 24px 20px 80px;
}

.topbar {
  background: var(--surface);
  border-bottom: 1px solid var(--line);
  padding: 12px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  position: sticky;
  top: 0;
  z-index: 10;
}
.topbar .brand {
  font-weight: 600;
  letter-spacing: .04em;
}
.topbar nav a {
  margin-left: 18px;
  color: var(--ink-2);
  font-size: 14px;
}
.topbar nav a:hover { color: var(--ink); }

/* --- Page heading --- */

.page-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin: 0 0 20px;
  gap: 12px;
}
.page-head h1 {
  margin: 0;
  font-size: 22px;
  font-weight: 500;
  letter-spacing: .01em;
  text-align: center;
  flex: 1;
}
.month-nav {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2.6rem;
  height: 2.6rem;
  border-radius: 999px;
  background: var(--surface);
  border: 1px solid var(--line);
  font-size: 22px;
  color: var(--ink-2);
  flex-shrink: 0;
}
.month-nav:hover { border-color: var(--accent); color: var(--ink); }

/* --- Login --- */

.login-wrap {
  min-height: 80vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
}
.login-card {
  background: var(--surface);
  border-radius: var(--radius);
  border: 1px solid var(--line);
  padding: 36px 28px;
  width: 100%;
  max-width: 360px;
  text-align: center;
  box-shadow: var(--shadow);
}
.login-emoji { font-size: 40px; margin-bottom: 8px; }
.login-card h1 {
  font-weight: 500;
  letter-spacing: .14em;
  margin: 0 0 4px;
  font-size: 24px;
}
.login-sub {
  color: var(--ink-2);
  font-size: 14px;
  margin-bottom: 20px;
}
.login-card form {
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.login-card input {
  padding: 12px 14px;
  border: 1px solid var(--line);
  border-radius: 10px;
  font-size: 16px;
  background: var(--bg);
  text-align: center;
}
.login-card input:focus {
  outline: none;
  border-color: var(--accent);
}
.login-card button {
  padding: 12px 18px;
  border-radius: 10px;
  border: none;
  background: var(--ink);
  color: white;
  font-weight: 500;
  font-size: 15px;
}
.login-card button:hover { background: var(--accent-2); }
.login-error {
  color: var(--danger);
  font-size: 14px;
  margin-bottom: 12px;
}

/* --- Calendar --- */

.calendar-page .legend {
  display: flex;
  gap: 16px;
  font-size: 13px;
  color: var(--ink-2);
  margin: 0 0 14px;
  flex-wrap: wrap;
}
.lg-dot {
  display: inline-block;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  margin-right: 4px;
  vertical-align: middle;
}
.lg-today { background: var(--accent); }
.lg-busy  { background: var(--ink); }
.lg-off   { background: var(--off); }

.cal {
  width: 100%;
  border-collapse: separate;
  border-spacing: 6px;
  table-layout: fixed;
}
.cal th {
  font-size: 12px;
  font-weight: 500;
  color: var(--ink-3);
  text-transform: uppercase;
  letter-spacing: .12em;
  padding: 4px 0 8px;
  text-align: center;
}
.cal-cell {
  height: 76px;
  border-radius: 10px;
  background: var(--surface);
  border: 1px solid var(--line);
  vertical-align: top;
  position: relative;
  transition: border-color .12s ease;
}
.cal-cell.empty { background: transparent; border: none; }
.cal-cell a {
  display: block;
  padding: 6px 8px;
  height: 100%;
  color: inherit;
}
.cal-cell:hover { border-color: var(--accent); }
.cal-day {
  font-weight: 500;
  font-size: 15px;
}
.cal-cell.past .cal-day { color: var(--ink-3); }
.cal-cell.sunday .cal-day { color: var(--ink-3); }
.cal-cell.today {
  border-color: var(--ink);
  background: var(--surface);
}
.cal-cell.today .cal-day { color: var(--ink); font-weight: 700; }
.cal-cell.busy { background: var(--surface); }
.cal-cell.off { background: #fbeeee; border-color: #ecc8c8; }
.cal-cell.off .cal-day { color: var(--off); }

.cal-tag {
  position: absolute;
  bottom: 6px;
  left: 8px;
  font-size: 11px;
  letter-spacing: .04em;
  color: var(--ink-2);
}
.tag-busy {
  background: var(--ink);
  color: white;
  padding: 1px 7px;
  border-radius: 999px;
  font-weight: 600;
}
.tag-off { color: var(--off); }
.tag-sunday { color: var(--ink-3); }

/* --- Day --- */

.day-page h2 {
  font-weight: 500;
  font-size: 16px;
  letter-spacing: .04em;
  text-transform: uppercase;
  color: var(--ink-2);
  margin: 28px 0 12px;
}
.banner {
  border-radius: var(--radius);
  padding: 14px 16px;
  margin-bottom: 12px;
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}
.banner-off {
  background: #fbeeee;
  border: 1px solid #ecc8c8;
  color: var(--off);
}

.row-actions {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}
.row-actions form { width: 100%; max-width: 480px; display: flex; gap: 8px; }
.row-actions input[type="text"] {
  flex: 1;
  padding: 10px 12px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
  font-size: 14px;
}
.btn {
  padding: 10px 16px;
  border-radius: 8px;
  border: 1px solid var(--ink);
  background: var(--ink);
  color: white;
  font-size: 14px;
  font-weight: 500;
}
.btn:hover { background: var(--accent-2); border-color: var(--accent-2); }
.btn-ghost {
  background: transparent;
  color: var(--ink);
}
.btn-ghost:hover { background: var(--surface-2); }
.btn-danger {
  background: var(--danger);
  border-color: var(--danger);
  color: white;
}
.btn-tiny {
  padding: 4px 10px;
  font-size: 12px;
  border-radius: 6px;
  border: 1px solid var(--line);
  background: var(--surface);
  color: var(--ink-2);
}
.btn-tiny.btn-danger { color: white; background: var(--danger); border-color: var(--danger); }
.btn-tiny.btn-danger:hover { color: white; background: #8d2c2c; border-color: #8d2c2c; }
.btn-tiny:hover { color: var(--ink); border-color: var(--ink-3); }

.timeline {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  overflow: hidden;
}
.slot {
  display: grid;
  grid-template-columns: 60px 1fr auto;
  gap: 12px;
  padding: 9px 14px;
  border-bottom: 1px solid var(--line);
  align-items: center;
  font-size: 14px;
}
.slot:last-child { border-bottom: none; }
.slot-time {
  font-variant-numeric: tabular-nums;
  color: var(--ink-3);
  font-size: 13px;
}
.slot-free   { background: var(--surface); }
.slot-free .slot-label .muted { color: var(--ink-3); font-size: 13px; }
.slot-booked { background: var(--surface-2); }
.slot-booked .slot-time { color: var(--ink); font-weight: 600; }
.slot-blocked { background: #efefef; color: var(--ink-2); }
.slot-blocked .slot-time { color: var(--ink-3); }
.slot-meta { font-size: 12px; color: var(--ink-2); margin-top: 2px; }
.slot.continuation .slot-time { opacity: .35; }
.slot.continuation .slot-label { display: none; }

.form-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: end;
  padding: 14px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}
.form-grid label {
  display: flex;
  flex-direction: column;
  gap: 4px;
  font-size: 12px;
  color: var(--ink-2);
  text-transform: uppercase;
  letter-spacing: .08em;
}
.form-grid label.grow { flex: 1; min-width: 180px; }
.form-grid input,
.form-grid select {
  padding: 10px 12px;
  border: 1px solid var(--line);
  border-radius: 8px;
  font-size: 15px;
  background: var(--bg);
  text-transform: none;
  letter-spacing: normal;
}
.form-grid input:focus, .form-grid select:focus {
  outline: none;
  border-color: var(--accent);
}

.inline { display: inline; }
.hint { color: var(--ink-2); font-size: 13px; margin: -4px 0 6px; }

.cancelled-list {
  list-style: none;
  padding: 0;
  margin: 0;
  font-size: 13px;
  color: var(--ink-3);
}
.cancelled-list li {
  padding: 6px 0;
  border-bottom: 1px dashed var(--line);
  text-decoration: line-through;
}

/* --- Mobile --- */
@media (max-width: 600px) {
  main { padding: 16px 12px 60px; }
  .topbar { padding: 10px 14px; }
  .page-head h1 { font-size: 18px; }
  .cal { border-spacing: 3px; }
  .cal-cell { height: 56px; }
  .cal-day { font-size: 13px; }
  .cal-tag { font-size: 10px; left: 4px; bottom: 4px; }
  .form-grid label.grow { min-width: 140px; }
  .slot { grid-template-columns: 48px 1fr auto; padding: 8px 10px; gap: 8px; font-size: 13px; }
  .form-grid { padding: 10px; gap: 8px; }
}