/* Shared base styles — used by both the public pages and the admin.
   Classes provided:
     layout  .container .stack .row .row-wrap .spacer .muted .small .center .hidden .mono
     surface .card .card-title
     form    .field (wraps <label> + input/select/textarea + .hint/.error) .input (also styles bare inputs)
     button  .btn .btn-primary .btn-danger .btn-ghost .btn-sm .btn-block
     status  .badge + .s-waitlist .s-pending_payment .s-slip_uploaded .s-confirmed .s-expired .s-cancelled
     notice  .notice .notice-info .notice-warn .notice-error .notice-ok
     misc    .toast (fixed bottom message, add .show) .spinner .copy-row
   Tokens: see :root below. */

:root {
  --bg: #f4f6fb;
  --surface: #ffffff;
  --surface-2: #eef1f8;
  --text: #141a2b;
  --muted: #5b6478;
  --border: #d8deea;
  --primary: #2346d8;
  --primary-ink: #ffffff;
  --primary-soft: #e3e9ff;
  --accent: #ff6a1a;
  --danger: #c62f3b;
  --danger-soft: #fde7e9;
  --ok: #1d8a4e;
  --ok-soft: #e1f5ea;
  --warn: #a86400;
  --warn-soft: #fff1d6;
  --info: #1f62b5;
  --info-soft: #e2eefc;
  --neutral-soft: #eceff4;
  --radius: 12px;
  --radius-sm: 8px;
  --shadow: 0 1px 2px rgba(20, 26, 43, .06), 0 4px 16px rgba(20, 26, 43, .06);
  --font: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --mono: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0e121c;
    --surface: #171c29;
    --surface-2: #1f2534;
    --text: #e8ecf5;
    --muted: #9aa3b8;
    --border: #2c3446;
    --primary: #6f8cff;
    --primary-ink: #0b1024;
    --primary-soft: #1f2a52;
    --accent: #ff8a4a;
    --danger: #ff6b76;
    --danger-soft: #3a1c22;
    --ok: #4cc884;
    --ok-soft: #173326;
    --warn: #f2b14c;
    --warn-soft: #3a2c12;
    --info: #6aa8f5;
    --info-soft: #172a44;
    --neutral-soft: #262c3a;
    --shadow: 0 1px 2px rgba(0, 0, 0, .3), 0 4px 16px rgba(0, 0, 0, .25);
    color-scheme: dark;
  }
}

*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.5 var(--font);
}
img { max-width: 100%; }
a { color: var(--primary); }
h1, h2, h3 { line-height: 1.2; margin: 0 0 .5em; }
p { margin: 0 0 .75em; }

/* layout */
.container { width: 100%; max-width: 720px; margin: 0 auto; padding: 16px; }
.stack > * + * { margin-top: 12px; }
.row { display: flex; align-items: center; gap: 8px; }
.row-wrap { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; }
.spacer { flex: 1; }
.muted { color: var(--muted); }
.small { font-size: .875rem; }
.center { text-align: center; }
.hidden { display: none !important; }
.mono { font-family: var(--mono); }

/* surfaces */
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 16px;
}
.card-title { font-size: 1.05rem; font-weight: 650; margin: 0 0 12px; }

/* forms */
.field { display: flex; flex-direction: column; gap: 6px; }
.field > label { font-weight: 600; font-size: .95rem; }
.field .hint { color: var(--muted); font-size: .85rem; }
.field .error { color: var(--danger); font-size: .85rem; }
.input, input[type=text], input[type=email], input[type=tel], input[type=password], input[type=number],
input[type=search], select, textarea {
  width: 100%;
  font: inherit;
  color: var(--text);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 10px 12px;
  min-height: 44px;
}
textarea { min-height: 88px; resize: vertical; }
input:focus-visible, select:focus-visible, textarea:focus-visible, .btn:focus-visible {
  outline: 3px solid var(--primary-soft);
  outline-offset: 1px;
  border-color: var(--primary);
}
input[aria-invalid=true] { border-color: var(--danger); }

/* buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  min-height: 44px;
  padding: 10px 16px;
  font: inherit;
  font-weight: 600;
  color: var(--text);
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  cursor: pointer;
  text-decoration: none;
  white-space: nowrap;
}
.btn:hover { filter: brightness(.97); }
.btn:disabled { opacity: .55; cursor: not-allowed; }
.btn-primary { background: var(--primary); border-color: var(--primary); color: var(--primary-ink); }
.btn-danger { background: var(--danger); border-color: var(--danger); color: #fff; }
.btn-ghost { background: transparent; border-color: transparent; color: var(--primary); }
.btn-sm { min-height: 34px; padding: 6px 10px; font-size: .875rem; }
.btn-block { width: 100%; }

/* status badges */
.badge {
  display: inline-block;
  padding: 3px 10px;
  border-radius: 999px;
  font-size: .8rem;
  font-weight: 700;
  letter-spacing: .01em;
  white-space: nowrap;
  background: var(--neutral-soft);
  color: var(--muted);
}
.s-waitlist        { background: var(--info-soft);    color: var(--info); }
.s-pending_payment { background: var(--warn-soft);    color: var(--warn); }
.s-slip_uploaded   { background: var(--primary-soft); color: var(--primary); }
.s-confirmed       { background: var(--ok-soft);      color: var(--ok); }
.s-expired         { background: var(--danger-soft);  color: var(--danger); }
.s-cancelled       { background: var(--neutral-soft); color: var(--muted); }

/* notices */
.notice { border-radius: var(--radius-sm); padding: 12px 14px; border: 1px solid transparent; }
.notice-info  { background: var(--info-soft);   color: var(--text); border-color: color-mix(in srgb, var(--info) 30%, transparent); }
.notice-warn  { background: var(--warn-soft);   color: var(--text); border-color: color-mix(in srgb, var(--warn) 30%, transparent); }
.notice-error { background: var(--danger-soft); color: var(--text); border-color: color-mix(in srgb, var(--danger) 30%, transparent); }
.notice-ok    { background: var(--ok-soft);     color: var(--text); border-color: color-mix(in srgb, var(--ok) 30%, transparent); }

/* misc */
.toast {
  position: fixed;
  left: 50%;
  bottom: 20px;
  transform: translate(-50%, 20px);
  max-width: calc(100% - 32px);
  background: var(--text);
  color: var(--bg);
  padding: 10px 16px;
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow);
  opacity: 0;
  pointer-events: none;
  transition: opacity .2s, transform .2s;
  z-index: 1000;
}
.toast.show { opacity: 1; transform: translate(-50%, 0); }
.spinner {
  width: 18px; height: 18px;
  border: 2px solid currentColor;
  border-right-color: transparent;
  border-radius: 50%;
  display: inline-block;
  animation: spin .7s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }
.copy-row { display: flex; align-items: center; gap: 8px; justify-content: space-between; }
.copy-row .mono { overflow-wrap: anywhere; }