/* ============ Swim Lessons Booking — shared styles ============ */
:root {
  --blue: #0369a1;
  --blue-dark: #075985;
  --aqua: #06b6d4;
  --aqua-light: #cffafe;
  --bg: #f0f9ff;
  --card: #ffffff;
  --text: #0f172a;
  --muted: #64748b;
  --border: #e2e8f0;
  --green: #059669;
  --red: #dc2626;
  --radius: 12px;
  --shadow: 0 1px 3px rgba(2, 44, 74, 0.08), 0 4px 16px rgba(2, 44, 74, 0.06);
}
* { box-sizing: border-box; margin: 0; padding: 0; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.55;
}
a { color: var(--blue); }

.container { max-width: 1100px; margin: 0 auto; padding: 0 20px; }

/* ---- Nav ---- */
nav {
  background: var(--card);
  border-bottom: 1px solid var(--border);
  position: sticky; top: 0; z-index: 50;
}
nav .container { display: flex; align-items: center; justify-content: space-between; height: 60px; }
.brand { font-weight: 800; font-size: 1.15rem; color: var(--blue-dark); text-decoration: none; display: flex; align-items: center; gap: 8px; }
.nav-links { display: flex; gap: 18px; align-items: center; }
.nav-links a { text-decoration: none; color: var(--muted); font-weight: 500; font-size: 0.95rem; }
.nav-links a:hover { color: var(--blue); }
/* .nav-links a would otherwise repaint button text grey */
.nav-links a.btn, .nav-links a.btn:hover { color: #fff; }
.nav-links a.btn.secondary, .nav-links a.btn.secondary:hover { color: var(--blue-dark); }

/* ---- Buttons ---- */
.btn {
  display: inline-block; border: none; cursor: pointer;
  background: var(--blue); color: #fff;
  padding: 10px 20px; border-radius: 8px;
  font-size: 0.95rem; font-weight: 600; text-decoration: none;
  transition: background 0.15s;
}
.btn:hover { background: var(--blue-dark); }
.btn.secondary { background: var(--aqua-light); color: var(--blue-dark); }
.btn.secondary:hover { background: #a5f3fc; }
.btn.danger { background: #fee2e2; color: var(--red); }
.btn.danger:hover { background: #fecaca; }
.btn.small { padding: 6px 12px; font-size: 0.85rem; }
.btn:disabled { opacity: 0.5; cursor: not-allowed; }
.btn.google {
  background: #fff; color: var(--text); border: 1px solid var(--border);
  display: inline-flex; align-items: center; justify-content: center; gap: 10px;
}
.btn.google:hover { background: #f8fafc; }

/* ---- "or" divider on the login card ---- */
.divider { display: flex; align-items: center; gap: 10px; color: var(--muted); font-size: 0.8rem; margin: 18px 0 4px; }
.divider::before, .divider::after { content: ''; flex: 1; height: 1px; background: var(--border); }

/* ---- Cards / forms ---- */
.card {
  background: var(--card); border-radius: var(--radius);
  box-shadow: var(--shadow); padding: 24px; margin-bottom: 20px;
}
label { display: block; font-weight: 600; font-size: 0.88rem; margin: 12px 0 4px; }
input, select, textarea {
  width: 100%; padding: 10px 12px; border: 1px solid var(--border);
  border-radius: 8px; font-size: 0.95rem; font-family: inherit; background: #fff;
}
input:focus, select:focus, textarea:focus { outline: 2px solid var(--aqua); border-color: transparent; }
.row { display: flex; gap: 12px; flex-wrap: wrap; }
.row > * { flex: 1; min-width: 130px; }

/* ---- Feedback ---- */
.msg { padding: 12px 16px; border-radius: 8px; margin: 12px 0; font-size: 0.92rem; display: none; }
.msg.show { display: block; }
.msg.error { background: #fee2e2; color: #991b1b; }
.msg.success { background: #d1fae5; color: #065f46; }

/* ---- Tables ---- */
table { width: 100%; border-collapse: collapse; font-size: 0.9rem; }
th, td { text-align: left; padding: 10px 12px; border-bottom: 1px solid var(--border); }
th { color: var(--muted); font-size: 0.78rem; text-transform: uppercase; letter-spacing: 0.04em; }
tr:hover td { background: #f8fafc; }
td .rowSel, th #selAll { width: 16px; height: 16px; cursor: pointer; }

/* ---- Bulk action bar (e.g. cancel several slots at once) ---- */
.bulkbar { display: flex; align-items: center; gap: 12px; margin-bottom: 10px; }

/* ---- Badges ---- */
.badge { display: inline-block; padding: 2px 10px; border-radius: 999px; font-size: 0.75rem; font-weight: 700; }
.badge.open { background: #d1fae5; color: #065f46; }
.badge.booked { background: #dbeafe; color: #1e40af; }
.badge.cancelled { background: #f1f5f9; color: var(--muted); }

/* ---- Modal ---- */
.modal-backdrop {
  position: fixed; inset: 0; background: rgba(15, 23, 42, 0.5);
  display: none; align-items: center; justify-content: center; z-index: 100; padding: 20px;
}
.modal-backdrop.show { display: flex; }
.modal { background: #fff; border-radius: var(--radius); padding: 28px; max-width: 440px; width: 100%; max-height: 90vh; overflow-y: auto; }
.modal h3 { margin-bottom: 4px; }

/* ---- Week navigation ---- */
.week-nav { display: flex; align-items: center; justify-content: space-between; gap: 12px; margin-bottom: 16px; flex-wrap: wrap; }
.week-nav h2 { font-size: 1.1rem; }

/* ---- Filter chips (customer view) ---- */
.chips { display: flex; gap: 8px; flex-wrap: wrap; }
.chip {
  border: 1px solid var(--border); background: #fff; color: var(--muted);
  border-radius: 999px; padding: 6px 13px; font-size: 0.85rem; font-weight: 600;
  cursor: pointer; transition: background 0.1s;
}
.chip:hover { border-color: var(--aqua); color: var(--blue-dark); }
.chip.active { background: var(--blue); border-color: var(--blue); color: #fff; }

/* ---- Booking week calendar (customer view) ---- */
.bcal { display: grid; grid-template-columns: repeat(7, minmax(0, 1fr)); gap: 8px; }
.bcal-day { background: #f8fafc; border: 1px solid var(--border); border-radius: 10px; padding: 8px; min-width: 0; }
.bcal-head {
  font-weight: 700; font-size: 0.82rem; text-align: center; color: var(--blue-dark);
  padding-bottom: 8px; margin-bottom: 8px; border-bottom: 1px solid var(--border);
}
.bcal-head span { display: block; font-weight: 500; color: var(--muted); font-size: 0.75rem; }
.bcal-head.today { color: var(--blue); }
.bcal-head.today span { color: var(--blue); }
.bcal-bucket {
  font-size: 0.68rem; font-weight: 700; text-transform: uppercase; letter-spacing: 0.05em;
  color: var(--muted); margin: 10px 0 6px;
}
.bcal-bucket:first-of-type { margin-top: 0; }
.bcal-slot { display: block; width: 100%; margin-bottom: 8px; padding: 8px 10px; }
.bcal-slot.is-booked {
  opacity: 0.55; filter: grayscale(70%); pointer-events: none;
  border-style: dashed; box-shadow: none;
}
.bcal-none { color: var(--muted); font-size: 0.8rem; text-align: center; padding: 14px 0; }
@media (max-width: 720px) {
  /* Phones: stack day by day, hide empty days */
  .bcal { display: block; }
  .bcal-day { margin-bottom: 12px; }
  .bcal-day.is-empty { display: none; }
  .bcal-head { display: flex; align-items: baseline; gap: 8px; text-align: left; font-size: 0.95rem; }
  .bcal-head span { font-size: 0.85rem; }
}

/* ---- Slot chips (customer view) ---- */
.day-group { margin-bottom: 22px; }
.day-group h3 { font-size: 0.95rem; color: var(--blue-dark); margin-bottom: 10px; }
.slot-grid { display: flex; flex-wrap: wrap; gap: 10px; }
.clickable { cursor: pointer; }
.slot-chip {
  background: var(--card); border: 1.5px solid var(--aqua);
  border-radius: 10px; padding: 10px 14px; cursor: pointer;
  font-size: 0.88rem; box-shadow: var(--shadow); transition: transform 0.1s;
}
.slot-chip:hover { transform: translateY(-2px); background: var(--aqua-light); }
.slot-chip .time { font-weight: 700; color: var(--blue-dark); }
.slot-chip .meta { color: var(--muted); font-size: 0.8rem; }

/* ---- Staff calendar ---- */
.cal-wrap { overflow-x: auto; }
.cal {
  display: grid; grid-template-columns: 52px repeat(7, minmax(120px, 1fr));
  border: 1px solid var(--border); border-radius: 8px; background: #fff; min-width: 900px;
}
.cal .head {
  padding: 8px 6px; font-size: 0.8rem; font-weight: 700; text-align: center;
  border-bottom: 2px solid var(--border); background: #f8fafc; position: sticky; top: 0;
}
.cal .head.today { color: var(--blue); }
.cal .time-col { font-size: 0.7rem; color: var(--muted); text-align: right; padding-right: 6px; border-right: 1px solid var(--border); }
.cal .day-col { position: relative; border-right: 1px solid #f1f5f9; }
.cal .hour-line { height: 48px; border-bottom: 1px solid #f1f5f9; }
.cal-block {
  position: absolute; left: 3px; right: 3px; border-radius: 6px;
  font-size: 0.7rem; padding: 3px 6px; overflow: hidden; cursor: default;
  border-left: 3px solid;
}
.cal-block.slot-open { background: #d1fae5; border-color: var(--green); color: #065f46; cursor: pointer; }
.cal-block.slot-booked { background: #dbeafe; border-color: #2563eb; color: #1e40af; cursor: pointer; }

/* ---- Tabs ---- */
.tabs { display: flex; gap: 4px; border-bottom: 2px solid var(--border); margin-bottom: 20px; flex-wrap: wrap; }
.tabs button {
  background: none; border: none; padding: 10px 16px; cursor: pointer;
  font-size: 0.92rem; font-weight: 600; color: var(--muted);
  border-bottom: 2px solid transparent; margin-bottom: -2px;
}
.tabs button.active { color: var(--blue); border-bottom-color: var(--blue); }

/* ---- Hero (landing) ---- */
.hero {
  background: linear-gradient(135deg, var(--blue-dark), var(--aqua));
  color: #fff; padding: 80px 0 90px; text-align: center;
}
.hero h1 { font-size: 2.6rem; margin-bottom: 12px; }
.hero p { font-size: 1.15rem; opacity: 0.92; max-width: 560px; margin: 0 auto 28px; }
.section { padding: 56px 0; }
.section h2 { text-align: center; margin-bottom: 28px; color: var(--blue-dark); }
.coach-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); gap: 20px; }
.coach-card { text-align: center; }
.coach-avatar {
  width: 72px; height: 72px; border-radius: 50%; margin: 0 auto 12px;
  background: var(--aqua-light); color: var(--blue-dark);
  display: flex; align-items: center; justify-content: center;
  font-size: 1.6rem; font-weight: 800;
}
.coach-photo {
  width: 72px; height: 72px; border-radius: 50%; margin: 0 auto 12px;
  object-fit: cover; display: block;
}
.pool-photo { width: 100%; height: 140px; object-fit: cover; border-radius: 8px; margin-bottom: 12px; }
.pool-thumb { width: 56px; height: 40px; object-fit: cover; border-radius: 6px; display: block; }
.avatar-preview { width: 72px; height: 72px; border-radius: 50%; object-fit: cover; }
footer { text-align: center; color: var(--muted); font-size: 0.85rem; padding: 32px 0; }

.muted { color: var(--muted); font-size: 0.88rem; }
.empty { text-align: center; color: var(--muted); padding: 32px; }

@media (max-width: 640px) {
  .hero h1 { font-size: 1.9rem; }
  .nav-links { gap: 10px; font-size: 0.85rem; }
}