:root {
  --bg: #ffffff;
  --panel: #f8f9fa;
  --line: #e2e3e3;
  --line-strong: #c7c7c7;
  --text: #1f1f1f;
  --muted: #5f6368;
  --gold: #b8963e;
  --gold-soft: #f6efdc;
  --accent: #1a73e8;
  --today: #fff8e1;
  --weekend: #fafafa;
  --danger: #c5221f;
  --ok: #188038;
  --bar: #d2e3fc;
  --bar-text: #0b3d91;
  --bar-review: #fde7c3;
  --bar-review-text: #7a4a00;
}
* { box-sizing: border-box; }
html, body { margin: 0; background: var(--bg); color: var(--text);
  font: 14px/1.45 "Noto Sans Thai", "Sarabun", system-ui, -apple-system, "Segoe UI", sans-serif; }
a { color: var(--accent); }
button, input, select, textarea { font: inherit; color: inherit; }

.topbar { display: flex; align-items: center; gap: 4px; padding: 8px 16px; border-bottom: 1px solid var(--line);
  background: #111; color: #fff; position: sticky; top: 0; z-index: 20; flex-wrap: wrap; }
.brand { font-weight: 700; color: #e4c77b; margin-right: 12px; letter-spacing: .3px; }
.topbar a { color: #ddd; text-decoration: none; padding: 6px 10px; border-radius: 6px; }
.topbar a.on { background: #2a2a2a; color: #fff; }
.topbar .spacer { flex: 1; }

.toolbar { display: flex; align-items: center; gap: 8px; padding: 10px 16px; border-bottom: 1px solid var(--line);
  background: var(--panel); flex-wrap: wrap; }
.toolbar h1 { font-size: 16px; margin: 0 8px 0 0; }
.btn { border: 1px solid var(--line-strong); background: #fff; border-radius: 6px; padding: 6px 12px; cursor: pointer; }
.btn:hover { background: #f1f3f4; }
.btn.primary { background: #111; color: #fff; border-color: #111; }
.btn.danger { color: var(--danger); }
.status { color: var(--muted); font-size: 13px; margin-left: auto; }
.status.err { color: var(--danger); }

/* ตารางแบบ Google Sheets */
.sheet-wrap { overflow: auto; height: calc(100vh - 108px); }
table.sheet { border-collapse: separate; border-spacing: 0; min-width: 100%; }
.sheet th, .sheet td { border-right: 1px solid var(--line); border-bottom: 1px solid var(--line);
  padding: 0; height: 28px; white-space: nowrap; }
.sheet thead th { position: sticky; top: 0; background: var(--panel); z-index: 5; font-weight: 600;
  font-size: 12.5px; padding: 4px 8px; text-align: left; vertical-align: bottom; }
.sheet thead th .sub { display: block; font-weight: 400; color: var(--muted); font-size: 11.5px; }
.sheet .rowhead { position: sticky; left: 0; background: var(--panel); z-index: 4; text-align: center;
  color: var(--muted); font-size: 12px; min-width: 64px; padding: 0 6px; }
.sheet thead th.rowhead { z-index: 6; }
.sheet td input, .sheet td select { width: 100%; height: 28px; border: 0; padding: 0 8px; background: transparent; outline: none; }
.sheet td input:focus, .sheet td select:focus { box-shadow: inset 0 0 0 2px var(--accent); background: #fff; }
.sheet td.num input { text-align: right; }
.sheet tr.inactive td { color: #9aa0a6; background: #fbfbfb; }

/* ปฏิทินจอง */
.cal td.day { min-width: 112px; max-width: 112px; cursor: pointer; position: relative; }
.cal td.day:hover { background: #f1f3f4; }
.cal tr.weekend td.day { background: var(--weekend); }
.cal tr.today td, .cal tr.today .rowhead { background: var(--today) !important; }
.cal tr.today .rowhead { color: var(--text); font-weight: 700; }
.cal td.booked { background: var(--bar) !important; color: var(--bar-text); }
.cal td.booked.review { background: var(--bar-review) !important; color: var(--bar-review-text); }
.cal td.booked .lbl { display: block; padding: 0 6px; overflow: hidden; text-overflow: ellipsis; font-size: 12.5px; }
.cal td.booked.first .lbl { font-weight: 600; }
.cal td.booked:not(.first) { border-top-color: transparent; }
.legend { display: flex; gap: 12px; align-items: center; font-size: 12.5px; color: var(--muted); }
.legend i { display: inline-block; width: 12px; height: 12px; border-radius: 3px; vertical-align: -1px; margin-right: 4px; }

/* วันนี้ */
.today-box { display: flex; gap: 16px; padding: 10px 16px; border-bottom: 1px solid var(--line); flex-wrap: wrap; font-size: 13px; }
.today-box b { color: var(--gold); }
.today-box ul { margin: 2px 0 0; padding-left: 18px; }

/* แผงแก้การจอง */
.drawer { position: fixed; top: 0; right: 0; width: min(420px, 100vw); height: 100vh; background: #fff;
  border-left: 1px solid var(--line-strong); box-shadow: -8px 0 24px rgba(0,0,0,.08); z-index: 50;
  display: flex; flex-direction: column; transform: translateX(100%); transition: transform .18s; }
.drawer.open { transform: none; }
.drawer header { display: flex; align-items: center; padding: 12px 16px; border-bottom: 1px solid var(--line); }
.drawer header h2 { font-size: 16px; margin: 0; flex: 1; }
.drawer form { padding: 12px 16px; overflow: auto; flex: 1; display: grid; gap: 10px; grid-template-columns: 1fr 1fr; align-content: start; }
.drawer label { display: flex; flex-direction: column; gap: 3px; font-size: 12.5px; color: var(--muted); }
.drawer label.full { grid-column: 1 / -1; }
.drawer input, .drawer select, .drawer textarea { border: 1px solid var(--line-strong); border-radius: 6px; padding: 7px 9px; color: var(--text); background: #fff; }
.drawer textarea { min-height: 70px; resize: vertical; }
.drawer .raw { grid-column: 1 / -1; background: var(--bar-review); color: var(--bar-review-text); border-radius: 6px; padding: 8px 10px; font-size: 12.5px; white-space: pre-wrap; }
.drawer footer { display: flex; gap: 8px; padding: 12px 16px; border-top: 1px solid var(--line); }
.drawer footer .grow { flex: 1; }
.err-msg { grid-column: 1 / -1; color: var(--danger); font-size: 13px; }

/* ล็อกอิน */
.login { max-width: 360px; margin: 12vh auto; padding: 28px; border: 1px solid var(--line); border-radius: 12px; }
.login h1 { font-size: 20px; margin: 0 0 4px; }
.login p { color: var(--muted); margin: 0 0 18px; }
.login label { display: block; font-size: 13px; color: var(--muted); margin-bottom: 12px; }
.login input { width: 100%; padding: 10px 12px; border: 1px solid var(--line-strong); border-radius: 8px; margin-top: 4px; }
.login button { width: 100%; padding: 11px; border: 0; border-radius: 8px; background: #111; color: #fff; font-weight: 600; cursor: pointer; }

@media (max-width: 640px) {
  .topbar, .toolbar, .today-box { padding-left: 16px; padding-right: 16px; }
  .sheet-wrap { height: calc(100vh - 150px); }
  .drawer form { grid-template-columns: 1fr; }
}