/* ── Reset & Variables ─────────────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --bg: #111;
  --surface: #1e1e1e;
  --surface2: #252525;
  --border: #2e2e2e;
  --accent: #E84040;
  --text: #f0f0f0;
  --muted: #888;
  --success: #00B894;
  --warning: #FDCB6E;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  font-size: 14px;
}

/* ── Header ────────────────────────────────────────────────────────────────── */
.site-header {
  background: var(--surface);
  border-bottom: 2px solid var(--accent);
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 58px;
  position: sticky;
  top: 0;
  z-index: 50;
  gap: 12px;
}

.site-header .logo img {
  height: 38px;
  width: auto;
  display: block;
}

.week-nav {
  display: flex;
  align-items: center;
  gap: 10px;
}

.week-nav-btn {
  background: var(--surface2);
  border: 1px solid var(--border);
  color: var(--text);
  width: 30px;
  height: 30px;
  border-radius: 6px;
  cursor: pointer;
  font-size: 1rem;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.15s;
  flex-shrink: 0;
}
.week-nav-btn:hover { background: #333; }

.week-label {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text);
  min-width: 160px;
  text-align: center;
  white-space: nowrap;
}

.site-nav a {
  color: var(--muted);
  text-decoration: none;
  margin-left: 18px;
  font-size: 0.85rem;
  transition: color 0.15s;
  white-space: nowrap;
}
.site-nav a:hover { color: var(--text); }

/* ── Tabs ──────────────────────────────────────────────────────────────────── */
.tabs {
  display: flex;
  border-bottom: 1px solid var(--border);
  background: var(--surface);
  padding: 0 24px;
  position: sticky;
  top: 58px;
  z-index: 40;
}
.tab {
  padding: 11px 18px;
  cursor: pointer;
  color: var(--muted);
  border-bottom: 2px solid transparent;
  font-size: 0.87rem;
  font-weight: 500;
  transition: color 0.15s;
  white-space: nowrap;
}
.tab:hover { color: var(--text); }
.tab.active { color: var(--text); border-bottom-color: var(--accent); }

/* ── Stats Bar ─────────────────────────────────────────────────────────────── */
.stats-bar {
  display: flex;
  gap: 1px;
  background: var(--border);
  border-bottom: 1px solid var(--border);
}
.stat-card {
  flex: 1;
  background: var(--surface);
  padding: 12px 16px;
  text-align: center;
  min-width: 0;
}
.stat-num {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--accent);
  line-height: 1;
}
.stat-label {
  font-size: 0.72rem;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.8px;
  margin-top: 3px;
}

/* ── Calendar Grid ─────────────────────────────────────────────────────────── */
.calendar-outer {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.cal-inner {
  min-width: 700px;
  display: flex;
  flex-direction: column;
}

/* Day header row — sticky below site-header (58px) + tabs (~42px) = 100px
   Lives OUTSIDE calendar-outer so overflow-x: auto doesn't break sticky */
.cal-header-sticky {
  position: sticky;
  top: 100px;
  z-index: 30;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  overflow-x: hidden; /* clip when calendar body scrolls horizontally */
}

.cal-inner-header {
  min-width: 700px;
  display: flex;
  will-change: transform; /* GPU-accelerated scroll sync */
}

.time-gutter {
  width: 56px;
  flex-shrink: 0;
  border-right: 1px solid var(--border);
}

.day-heads-row {
  flex: 1;
  display: grid;
  grid-template-columns: repeat(7, 1fr);
}

.day-head {
  padding: 8px 4px;
  text-align: center;
  border-left: 1px solid var(--border);
  cursor: default;
}

.dh-day {
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.8px;
  color: var(--muted);
}

.dh-date {
  font-size: 1rem;
  font-weight: 700;
  margin-top: 1px;
  color: var(--text);
}

.day-head.is-today .dh-date {
  color: var(--accent);
}
.day-head.is-today {
  border-bottom: 2px solid var(--accent);
}

/* Calendar body */
.cal-body {
  display: flex;
}

.time-axis {
  width: 56px;
  flex-shrink: 0;
  position: relative;
  height: 900px;
  border-right: 1px solid var(--border);
}

.time-label {
  position: absolute;
  right: 7px;
  font-size: 0.67rem;
  color: var(--muted);
  transform: translateY(-50%);
  white-space: nowrap;
  user-select: none;
}

.cal-days {
  flex: 1;
  display: grid;
  grid-template-columns: repeat(7, 1fr);
}

.day-col {
  position: relative;
  height: 900px;
  border-left: 1px solid var(--border);
  /* Hour grid lines at every 60px */
  background-image: repeating-linear-gradient(
    to bottom,
    transparent 0px,
    transparent 29px,
    rgba(255,255,255,0.03) 29px,
    rgba(255,255,255,0.03) 30px,
    transparent 30px,
    transparent 59px,
    var(--border) 59px,
    var(--border) 60px
  );
}

.day-col.is-today {
  background-color: rgba(232, 64, 64, 0.025);
  background-image: repeating-linear-gradient(
    to bottom,
    transparent 0px,
    transparent 29px,
    rgba(255,255,255,0.03) 29px,
    rgba(255,255,255,0.03) 30px,
    transparent 30px,
    transparent 59px,
    rgba(232, 64, 64, 0.15) 59px,
    rgba(232, 64, 64, 0.15) 60px
  );
}

/* ── Class Blocks ──────────────────────────────────────────────────────────── */
.class-block {
  position: absolute;
  left: 2px;
  right: 2px;
  border-radius: 4px;
  padding: 4px 6px;
  cursor: pointer;
  overflow: hidden;
  z-index: 1;
  line-height: 1.3;
  transition: filter 0.12s, z-index 0s;
  border-left: 3px solid rgba(0,0,0,0.25);
}

.class-block:hover {
  filter: brightness(1.18);
  z-index: 5;
  box-shadow: 0 2px 12px rgba(0,0,0,0.5);
}

.cb-name {
  font-size: 0.75rem;
  font-weight: 700;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.cb-instructor {
  font-size: 0.68rem;
  opacity: 0.85;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.cb-time {
  font-size: 0.67rem;
  opacity: 0.8;
  white-space: nowrap;
  overflow: hidden;
}

.cb-spots {
  font-size: 0.63rem;
  opacity: 0.85;
  margin-top: 2px;
  white-space: nowrap;
}

.cb-full {
  display: inline-block;
  background: rgba(0,0,0,0.35);
  padding: 0 4px;
  border-radius: 2px;
  font-size: 0.6rem;
  font-weight: 700;
  letter-spacing: 0.5px;
  vertical-align: middle;
}

/* ── Modal ─────────────────────────────────────────────────────────────────── */
.modal {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.75);
  z-index: 200;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 16px;
  backdrop-filter: blur(2px);
}

.modal-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  width: 100%;
  max-width: 460px;
  max-height: 90vh;
  overflow-y: auto;
  position: relative;
  box-shadow: 0 20px 60px rgba(0,0,0,0.6);
}

.modal-card.modal-wide {
  max-width: 620px;
}

.modal-color-bar {
  height: 4px;
  border-radius: 12px 12px 0 0;
  flex-shrink: 0;
}

.modal-body {
  padding: 24px;
}

.modal-close {
  position: absolute;
  top: 10px;
  right: 14px;
  background: none;
  border: none;
  color: var(--muted);
  font-size: 1.5rem;
  cursor: pointer;
  line-height: 1;
  z-index: 1;
  padding: 4px;
  transition: color 0.15s;
}
.modal-close:hover { color: var(--text); }

.modal-title {
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: 4px;
}

.modal-subtitle {
  color: var(--muted);
  font-size: 0.85rem;
  margin-bottom: 8px;
}

.modal-spots {
  display: inline-block;
  font-size: 0.8rem;
  padding: 3px 10px;
  border-radius: 20px;
  margin-bottom: 18px;
  background: var(--surface2);
  border: 1px solid var(--border);
}
.modal-spots.is-full { color: var(--muted); }
.modal-spots.has-spots { color: var(--success); }

/* ── Attendee Table ────────────────────────────────────────────────────────── */
.attendee-section {
  margin-top: 12px;
}
.attendee-section h4 {
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.8px;
  color: var(--muted);
  margin-bottom: 10px;
}

/* ── Tables ────────────────────────────────────────────────────────────────── */
table {
  width: 100%;
  border-collapse: collapse;
}
th, td {
  padding: 9px 12px;
  text-align: left;
  border-bottom: 1px solid var(--border);
  font-size: 0.85rem;
}
th {
  color: var(--muted);
  font-weight: 600;
  text-transform: uppercase;
  font-size: 0.72rem;
  letter-spacing: 0.8px;
}
tr:last-child td { border-bottom: none; }
tr:hover td { background: rgba(255,255,255,0.03); }

/* ── Badges ────────────────────────────────────────────────────────────────── */
.badge {
  display: inline-block;
  padding: 2px 8px;
  border-radius: 10px;
  font-size: 0.72rem;
  font-weight: 600;
  text-transform: capitalize;
}
.badge-confirmed { background: rgba(0,184,148,0.2); color: #00B894; }
.badge-waitlist  { background: rgba(253,203,110,0.2); color: #FDCB6E; }
.badge-cancelled { background: rgba(232,64,64,0.15); color: #E84040; }

/* ── Buttons ───────────────────────────────────────────────────────────────── */
.btn {
  display: inline-block;
  padding: 9px 20px;
  border-radius: 7px;
  border: none;
  cursor: pointer;
  font-size: 0.88rem;
  font-weight: 600;
  text-decoration: none;
  transition: opacity 0.15s, background 0.15s;
  text-align: center;
  white-space: nowrap;
}
.btn:hover { opacity: 0.88; }
.btn:disabled { opacity: 0.4; cursor: not-allowed; }
.btn-primary { background: var(--accent); color: #fff; }
.btn-secondary { background: var(--surface2); border: 1px solid var(--border); color: var(--text); }
.btn-danger { background: #8b0000; color: #fff; }
.btn-sm { padding: 5px 12px; font-size: 0.8rem; border-radius: 5px; }

/* ── Forms ─────────────────────────────────────────────────────────────────── */
.form-group { margin-bottom: 16px; }
label {
  display: block;
  font-size: 0.82rem;
  color: var(--muted);
  margin-bottom: 5px;
  font-weight: 500;
}
input[type="text"],
input[type="email"],
input[type="date"],
select,
textarea {
  width: 100%;
  background: #1a1a1a;
  border: 1px solid var(--border);
  color: var(--text);
  padding: 9px 13px;
  border-radius: 6px;
  font-size: 0.9rem;
  outline: none;
  transition: border-color 0.15s;
  font-family: inherit;
}
input:focus, select:focus { border-color: var(--accent); }

/* ── Alerts ────────────────────────────────────────────────────────────────── */
.alert {
  padding: 12px 16px;
  border-radius: 7px;
  margin-bottom: 14px;
  font-size: 0.88rem;
  line-height: 1.5;
}
.alert-success {
  background: rgba(0,184,148,0.12);
  border: 1px solid rgba(0,184,148,0.4);
  color: #4cd3b5;
}
.alert-error {
  background: rgba(232,64,64,0.12);
  border: 1px solid rgba(232,64,64,0.4);
  color: #f08080;
}

/* ── Lookup / All Bookings view ────────────────────────────────────────────── */
.content-area {
  max-width: 960px;
  margin: 0 auto;
  padding: 24px 20px;
}

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 22px;
  margin-bottom: 20px;
}

.card h2 { font-size: 1.1rem; margin-bottom: 4px; }
.card .muted { color: var(--muted); font-size: 0.88rem; margin-bottom: 18px; }

/* ── Loading / Empty ───────────────────────────────────────────────────────── */
.loading {
  text-align: center;
  color: var(--muted);
  padding: 40px 16px;
  font-size: 0.9rem;
}
.empty {
  text-align: center;
  color: var(--muted);
  padding: 48px 16px;
  font-size: 0.9rem;
}

/* ── Legend ────────────────────────────────────────────────────────────────── */
.legend {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  padding: 10px 20px;
  border-bottom: 1px solid var(--border);
  background: var(--surface);
}
.legend-item {
  display: flex;
  align-items: center;
  gap: 5px;
  font-size: 0.75rem;
  color: var(--muted);
}
.legend-dot {
  width: 10px;
  height: 10px;
  border-radius: 2px;
  flex-shrink: 0;
}

/* ── Responsive ────────────────────────────────────────────────────────────── */
@media (max-width: 768px) {
  .site-header { padding: 0 12px; height: 52px; }
  .site-nav { display: none; }
  .week-label { min-width: 130px; font-size: 0.78rem; }
  .stats-bar { overflow-x: auto; }
  .stat-card { min-width: 80px; padding: 10px 10px; }
  .stat-num { font-size: 1.2rem; }
  .tabs { padding: 0 12px; top: 52px; }
  .tab { padding: 10px 12px; }
  .cal-header-sticky { top: 94px; } /* 52px header + ~42px tabs */
}

@media (max-width: 480px) {
  .legend { display: none; }
  .cal-inner { min-width: 600px; }
}