:root {
  --bg: #f3f5f8;
  --card: #fff;
  --text: #1c2430;
  --muted: #6b7686;
  --line: #e2e6ec;
  --primary: #1f5eff;
  --ok: #12a150;
  --ok-bg: #e6f7ee;
  --bad: #d92d20;
  --bad-bg: #fdecea;
  --warn: #b7791f;
  --warn-bg: #fff6e0;
  --radius: 12px;
}

* { box-sizing: border-box; }
html, body { margin: 0; }
body {
  font-family: "Sarabun", "Leelawadee UI", Tahoma, system-ui, sans-serif;
  background: var(--bg);
  color: var(--text);
  font-size: 15px;
  line-height: 1.5;
}
h1, h2 { margin: 0 0 12px; line-height: 1.3; }
h2 { font-size: 17px; }
code { background: #eef1f5; padding: 1px 5px; border-radius: 4px; }
.muted { color: var(--muted); }
.small { font-size: 13px; }
.mono { font-family: Consolas, "Courier New", monospace; }
.num { text-align: right; white-space: nowrap; }
[hidden] { display: none !important; }

/* ---------- controls ---------- */
input, select, textarea {
  font: inherit;
  padding: 9px 11px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
  color: inherit;
  width: 100%;
}
input:focus, select:focus, textarea:focus { outline: 2px solid var(--primary); outline-offset: -1px; border-color: transparent; }
input[type="checkbox"] { width: auto; }
textarea { font-family: Consolas, "Courier New", monospace; font-size: 13px; }

.btn {
  font: inherit;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 9px 16px;
  border-radius: 8px;
  border: 1px solid var(--line);
  background: #fff;
  color: var(--text);
  cursor: pointer;
  text-decoration: none;
  white-space: nowrap;
}
.btn:hover { background: #f7f8fa; }
.btn.primary { background: var(--primary); border-color: var(--primary); color: #fff; }
.btn.primary:hover { filter: brightness(1.08); }
.btn.ghost { background: transparent; }
.btn.danger { color: var(--bad); }
.btn.small { padding: 4px 10px; font-size: 13px; }

.card {
  background: var(--card);
  border-radius: var(--radius);
  padding: 18px 20px;
  box-shadow: 0 1px 2px rgba(20, 30, 50, .06);
  margin-bottom: 16px;
}
.card-head { display: flex; justify-content: space-between; align-items: center; gap: 12px; flex-wrap: wrap; margin-bottom: 8px; }
.card-head h2 { margin: 0; }
.row-gap { display: flex; gap: 8px; align-items: center; }
.search { width: 300px; max-width: 100%; }
details summary { cursor: pointer; }
details[open] summary { margin-bottom: 10px; }

.error { color: var(--bad); white-space: pre-wrap; margin: 8px 0 0; }
.success { color: var(--ok); white-space: pre-wrap; margin: 8px 0 0; }

.banner { padding: 10px 16px; border-radius: 8px; margin: 0 0 16px; font-weight: 600; }
.banner.warn { background: var(--warn-bg); color: var(--warn); }
.banner.danger { background: var(--bad-bg); color: var(--bad); }
body > .banner { margin: 12px 24px 0; }

.tag { display: inline-block; padding: 1px 8px; border-radius: 999px; font-size: 12px; background: #eef1f5; color: var(--muted); white-space: nowrap; }
.tag.ok { background: var(--ok-bg); color: var(--ok); }
.tag.bad { background: var(--bad-bg); color: var(--bad); }
.pill { background: #eef1f5; padding: 6px 12px; border-radius: 999px; font-size: 14px; white-space: nowrap; }

/* ---------- table ---------- */
.table { width: 100%; border-collapse: collapse; font-size: 14px; }
.table th, .table td { padding: 8px 10px; border-bottom: 1px solid var(--line); text-align: left; vertical-align: top; }
.table th { color: var(--muted); font-weight: 600; font-size: 13px; }
.table th.num, .table td.num { text-align: right; }
.table tr.inactive td { opacity: .5; }
.table td.actions { white-space: nowrap; text-align: right; }

/* ---------- layout ---------- */
.topbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
  padding: 12px 24px;
  background: #fff;
  border-bottom: 1px solid var(--line);
}
.brand { font-size: 19px; font-weight: 700; }
.topbar-right { display: flex; gap: 10px; align-items: center; flex-wrap: wrap; }
.inline-field { display: flex; align-items: center; gap: 8px; white-space: nowrap; }
.inline-field input { width: 140px; padding: 6px 10px; }

/* ---------- login ---------- */
.login-page { min-height: 100vh; display: grid; place-items: center; padding: 20px; }
.login-card { width: 100%; max-width: 380px; display: grid; gap: 12px; padding: 28px; }
.login-card h1 { font-size: 22px; margin: 0; }
.login-card p { margin: 0; }

/* ---------- admin ---------- */
.tabs { display: flex; gap: 4px; padding: 0 24px; background: #fff; border-bottom: 1px solid var(--line); overflow-x: auto; }
.tabs button {
  font: inherit;
  border: 0;
  background: none;
  padding: 12px 16px;
  cursor: pointer;
  color: var(--muted);
  border-bottom: 3px solid transparent;
  white-space: nowrap;
}
.tabs button.active { color: var(--primary); border-bottom-color: var(--primary); font-weight: 600; }
.admin-main { max-width: 1300px; margin: 0 auto; padding: 20px 24px 40px; }
.admin-main .card { overflow-x: auto; }

.stats { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 16px; margin-bottom: 16px; }
.stat { display: flex; flex-direction: column; margin: 0; }
.stat span { color: var(--muted); font-size: 14px; }
.stat b { font-size: 32px; }
.stat small { color: var(--muted); }

.grid-form { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 12px 16px; align-items: end; }
.grid-form label { display: flex; flex-direction: column; gap: 4px; font-size: 14px; color: var(--muted); }
.grid-form label.check { flex-direction: row; align-items: center; gap: 8px; color: var(--text); padding-bottom: 10px; }
.form-actions { display: flex; gap: 8px; align-items: center; grid-column: 1 / -1; margin-top: 8px; }
.grid-form .error { grid-column: 1 / -1; }
.grid-form label.wide { grid-column: 1 / -1; }
.grid-form textarea { font-family: inherit; font-size: 14px; color: var(--text); }
.logo-setting { margin-bottom: 18px; }
.logo-preview { margin-top: 6px; width: 260px; min-height: 80px; border: 1px dashed var(--line); border-radius: 8px; display: flex; align-items: center; justify-content: center; padding: 10px; background: #fff; }
.logo-preview img { max-width: 100%; max-height: 120px; filter: grayscale(1); }