:root {
  --bg: #f6f7f4;
  --surface: #ffffff;
  --text: #1b1f1c;
  --muted: #5d665f;
  --line: #dfe3dd;
  --accent: #0f5132;
  --accent-text: #ffffff;
  --free-bg: #e3f4ea;
  --free-text: #0b4a2c;
  --free-line: #8fd0ab;
  --off-bg: #eef0ec;
  --off-text: #8a928b;
  --warn-bg: #fff4d6;
  --warn-text: #6b4e00;
  --error: #b42318;
  --radius: 12px;
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #111412;
    --surface: #1a1e1b;
    --text: #e8ece8;
    --muted: #9aa49c;
    --line: #2c322e;
    --accent: #4cc38a;
    --accent-text: #08130d;
    --free-bg: #143323;
    --free-text: #a6f0c6;
    --free-line: #2f7a52;
    --off-bg: #222724;
    --off-text: #6d766f;
    --warn-bg: #3a3014;
    --warn-text: #f3d68a;
    --error: #ff8a80;
    color-scheme: dark;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.5 -apple-system, BlinkMacSystemFont, "Apple SD Gothic Neo", "Pretendard",
    "Noto Sans KR", system-ui, sans-serif;
  -webkit-text-size-adjust: 100%;
}

.top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: max(14px, env(safe-area-inset-top)) 16px 10px;
  max-width: 720px;
  margin: 0 auto;
}

h1 { font-size: 20px; margin: 0; letter-spacing: -0.01em; }
h2 { font-size: 13px; font-weight: 600; color: var(--muted); margin: 0 0 8px; }
h3 { font-size: 17px; margin: 0 0 10px; }

main {
  max-width: 720px;
  margin: 0 auto;
  padding: 0 16px max(32px, env(safe-area-inset-bottom));
}

.card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 16px;
  margin: 12px 0;
}

.lead { margin: 0 0 12px; }
.hint { color: var(--muted); font-size: 13px; margin: 6px 0 0; }
.strong { font-weight: 600; margin: 0; }
.error { color: var(--error); font-size: 14px; min-height: 1.5em; margin: 8px 0 0; }

form { display: flex; gap: 8px; }

input {
  flex: 1;
  min-width: 0;
  font: inherit;
  padding: 12px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--bg);
  color: var(--text);
}

button { font: inherit; cursor: pointer; }

.primary {
  background: var(--accent);
  color: var(--accent-text);
  border: 0;
  border-radius: 10px;
  padding: 12px 18px;
  font-weight: 600;
}
.primary:disabled { opacity: 0.5; cursor: default; }
.wide { width: 100%; margin: 4px 0 8px; padding: 14px; }

.link {
  background: none;
  border: 0;
  color: var(--muted);
  font-size: 14px;
  padding: 6px 0;
}

.group { margin: 16px 0; }

.chips { display: flex; flex-wrap: wrap; gap: 8px; }

.chip {
  border: 1px solid var(--line);
  background: var(--surface);
  color: var(--text);
  border-radius: 999px;
  padding: 8px 14px;
  font-size: 15px;
}
.chip[aria-checked="true"] {
  background: var(--accent);
  border-color: var(--accent);
  color: var(--accent-text);
  font-weight: 600;
}
.chip:disabled { opacity: 0.4; cursor: default; }

.banner {
  background: var(--warn-bg);
  color: var(--warn-text);
  border-radius: 10px;
  padding: 10px 12px;
  font-size: 14px;
  margin: 8px 0;
}

.progress { display: flex; gap: 14px; align-items: flex-start; }

.spinner {
  flex: none;
  width: 22px;
  height: 22px;
  margin-top: 2px;
  border-radius: 50%;
  border: 3px solid var(--line);
  border-top-color: var(--accent);
  animation: spin 0.9s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }
@media (prefers-reduced-motion: reduce) { .spinner { animation: none; } }

.messages { margin: 8px 0 0; padding-left: 18px; font-size: 13px; color: var(--muted); }

.summary { margin: 16px 0 4px; }
.summary .big { font-size: 22px; font-weight: 700; margin: 0; }
.summary .meta { color: var(--muted); font-size: 13px; margin: 2px 0 0; }

.toggle {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 14px;
  color: var(--muted);
  margin: 6px 0 0;
}

.court { padding: 10px 0; border-top: 1px solid var(--line); }
.court:first-of-type { border-top: 0; padding-top: 0; }
.court-name { font-weight: 600; margin: 0 0 6px; font-size: 15px; }
.court-note { color: var(--muted); font-size: 13px; margin: 0; }

.slots { display: flex; flex-wrap: wrap; gap: 6px; }

.slot {
  font-variant-numeric: tabular-nums;
  font-size: 14px;
  border-radius: 8px;
  padding: 5px 9px;
  border: 1px solid transparent;
}
.slot.free {
  background: var(--free-bg);
  color: var(--free-text);
  border-color: var(--free-line);
  font-weight: 600;
}
.slot.booked, .slot.locked {
  background: var(--off-bg);
  color: var(--off-text);
}
.slot.booked { text-decoration: line-through; }

.legend { display: flex; gap: 10px; font-size: 12px; color: var(--muted); margin: 8px 0 0; }
.legend .slot { font-size: 12px; padding: 2px 6px; }

.empty { color: var(--muted); }

.rules {
  color: var(--muted);
  font-size: 13px;
  margin-top: 28px;
  border-top: 1px solid var(--line);
  padding-top: 12px;
}
.rules p { margin: 4px 0; }
.rules a { color: var(--accent); }

[hidden] { display: none !important; }