:root {
  --bg: #f4f6f8; --panel: #fff; --text: #1d2530; --muted: #6b7682; --line: #dde3ea;
  --primary: #1f6feb; --primary-dark: #1a5fcc; --ok: #1f9d55; --bad: #d23f31; --warn: #d9822b;
  --topbar: #16202b; --radius: 6px; --font: system-ui, -apple-system, "Segoe UI", Roboto, "Noto Sans Thai", "Sarabun", sans-serif;
}
* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body { font-family: var(--font); font-size: 15px; color: var(--text); background: var(--bg); line-height: 1.45; }
a { color: var(--primary); text-decoration: none; }
a:hover { text-decoration: underline; }
h1 { font-size: 1.5rem; margin: 0 0 .75rem; }
h2 { font-size: 1.1rem; margin: 0 0 .6rem; }
h3 { font-size: 1rem; margin: 1rem 0 .4rem; }
code, .mono { font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; font-size: .92em; }
small, .small { font-size: .86em; }
.muted { color: var(--muted); }
.nowrap { white-space: nowrap; }
.inline { display: inline; }

/* top bar */
.topbar { display: flex; align-items: center; justify-content: space-between; background: var(--topbar); color: #fff; padding: 0 1rem; height: 50px; }
.topbar .brand { color: #fff; font-weight: 600; font-size: 1.05rem; }
.topbar .brand small { font-weight: 400; opacity: .7; margin-left: .4rem; }
.topnav { display: flex; align-items: center; gap: 1rem; }
.topnav a { color: #cfd8e3; }
.topnav a:hover { color: #fff; }
.topnav .link, .link { background: none; border: 0; color: #cfd8e3; cursor: pointer; font: inherit; padding: 0; }
.topnav .link:hover { color: #fff; text-decoration: underline; }
.user-chip { color: #9fb0c3; font-size: .9em; }
.lang-switch a { color: #9fb0c3; margin-left: .35rem; font-size: .85em; }
.lang-switch a.active { color: #fff; font-weight: 600; }

/* generic page */
.container { max-width: 1100px; margin: 1.5rem auto; padding: 0 1rem; }
.login-box, .error-box { max-width: 380px; margin: 4rem auto; background: var(--panel); padding: 1.75rem; border-radius: var(--radius); box-shadow: 0 1px 4px rgba(0,0,0,.08); }
.error-box { text-align: center; }
.error-box h1 { font-size: 3rem; color: var(--muted); }

.flash { padding: .6rem .9rem; border-radius: var(--radius); margin-bottom: 1rem; border: 1px solid transparent; }
.flash-success { background: #e6f6ec; border-color: #b9e3c6; color: #16623a; }
.flash-error { background: #fdecea; border-color: #f5c2bd; color: #8a241b; }
.flash-warning { background: #fff4e5; border-color: #f7d9b0; color: #7a4a0f; }
.flash-info { background: #e8f0fe; border-color: #c3d6fb; color: #1b4a9c; }

/* admin layout */
.admin-wrap { display: flex; min-height: calc(100vh - 50px); }
.sidenav { width: 200px; background: #fff; border-right: 1px solid var(--line); padding: 1rem 0; flex-shrink: 0; }
.sidenav a { display: block; padding: .5rem 1.25rem; color: var(--text); }
.sidenav a:hover { background: #f0f3f6; text-decoration: none; }
.sidenav a.active { background: #e8f0fe; color: var(--primary); font-weight: 600; border-right: 3px solid var(--primary); }
.admin-main { flex: 1; padding: 1.5rem 2rem; min-width: 0; }
.page-head { display: flex; align-items: center; justify-content: space-between; gap: 1rem; margin-bottom: 1rem; flex-wrap: wrap; }
.page-head h1 { margin: 0; }
.panel { background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius); padding: 1.25rem; margin-bottom: 1.25rem; }
.two-col { display: grid; grid-template-columns: 1fr 1fr; gap: 1.25rem; }
@media (max-width: 900px) { .two-col { grid-template-columns: 1fr; } .sidenav { width: 150px; } .admin-main { padding: 1rem; } }

.cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(140px, 1fr)); gap: 1rem; margin-bottom: .5rem; }
.card { background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius); padding: 1rem; text-align: center; }
.card-num { font-size: 2rem; font-weight: 700; }
.card-label { color: var(--muted); font-size: .9em; }
.card.ok .card-num { color: var(--ok); }
.card.bad .card-num { color: var(--bad); }
.card.muted .card-num { color: var(--muted); }

/* tables */
.table { width: 100%; border-collapse: collapse; }
.table th, .table td { text-align: left; padding: .5rem .6rem; border-bottom: 1px solid var(--line); vertical-align: middle; }
.table th { font-weight: 600; color: var(--muted); font-size: .85em; text-transform: uppercase; letter-spacing: .02em; }
.table.small td, .table.small th { padding: .35rem .5rem; }
.table .actions { white-space: nowrap; text-align: right; }
.table .actions form { display: inline; }
.row-muted td { color: var(--muted); }
.row-new td { background: #fafbfc; }
.table input[type=text], .table input[type=number] { width: 100%; }
.table input.short { width: 70px; }

.badge { display: inline-block; padding: .1rem .5rem; border-radius: 999px; font-size: .8em; font-weight: 600; background: #e3e8ee; color: #334; }
.badge.ok { background: #d9f2e3; color: #166534; }
.badge.bad { background: #fde2df; color: #991b1b; }
.badge.muted { background: #eceff3; color: #6b7682; }

/* buttons */
.btn { display: inline-block; padding: .45rem .9rem; border: 1px solid var(--line); border-radius: var(--radius); background: #fff; color: var(--text); font: inherit; cursor: pointer; line-height: 1.2; }
.btn:hover { background: #f0f3f6; text-decoration: none; }
.btn-primary { background: var(--primary); border-color: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-dark); }
.btn-danger { background: #fff; border-color: #f0b8b3; color: var(--bad); }
.btn-danger:hover { background: #fdecea; }
.btn-warn { border-color: #f1cfa5; color: var(--warn); }
.btn-warn:hover { background: #fff4e5; }
.btn-sm { padding: .25rem .6rem; font-size: .88em; }
.btn-block { width: 100%; }
.btn.confirming { background: var(--bad); color: #fff; border-color: var(--bad); }
.danger-zone { margin-top: 1rem; padding-top: 1rem; border-top: 1px dashed var(--line); }
.danger-zone form { margin-right: .5rem; }

/* forms */
.form label { display: block; margin-bottom: .9rem; font-weight: 500; }
.form label small { display: block; font-weight: 400; color: var(--muted); margin-top: .2rem; }
.form label .err, .err { display: block; color: var(--bad); font-size: .86em; margin-top: .2rem; font-weight: 500; }
.form input[type=text], .form input[type=password], .form input[type=number], .form input[type=search], .form select, .form textarea,
.login-box input[type=text], .login-box input[type=password], input[type=search] {
  display: block; width: 100%; padding: .45rem .6rem; border: 1px solid #c9d2dc; border-radius: var(--radius); font: inherit; margin-top: .25rem; background: #fff;
}
.form input.short { width: 90px; display: inline-block; }
.form .inline-inputs { display: inline-flex; align-items: center; gap: .4rem; }
.form .inline-inputs input { margin-top: 0; }
.form label.check, .login-box label.check, .group-box label.check { font-weight: 400; display: flex; align-items: center; gap: .4rem; }
.form label.check input, .login-box label.check input { width: auto; margin: 0; }
.form .row { display: flex; gap: 1.5rem; flex-wrap: wrap; }
.form .row > label { flex: 1 1 220px; }
.form-actions { margin-top: 1rem; display: flex; gap: .5rem; }
.form fieldset { border: 0; padding: 0; margin: 0; }
.group-box { border: 1px solid var(--line) !important; border-radius: var(--radius); padding: .75rem 1rem !important; margin-bottom: 1rem !important; }
.group-box legend { font-weight: 600; padding: 0 .3rem; }
.group-box label.check { margin-bottom: .3rem; }
.login-box label { display: block; margin-bottom: .9rem; }
.login-box .btn { margin-top: .5rem; }
.pagination a { display: inline-block; padding: .3rem .6rem; border: 1px solid var(--line); border-radius: var(--radius); margin-right: .25rem; }
.pagination a.active { background: var(--primary); color: #fff; border-color: var(--primary); }

/* key/value and copy rows */
.kv { display: grid; grid-template-columns: max-content 1fr; gap: .5rem 1rem; align-items: center; margin: .75rem 0; }
.kv label { font-weight: 600; }
.copy-row { display: flex; align-items: center; gap: .5rem; }
.copy-row code { background: #f0f3f6; padding: .35rem .6rem; border-radius: var(--radius); word-break: break-all; flex: 1; }
.copy-row.big code { font-size: 1.05em; padding: .6rem .8rem; }
code.secret { letter-spacing: .03em; }
.setup { border-left: 4px solid var(--primary); }
.dl { display: grid; grid-template-columns: max-content 1fr; gap: .3rem 1rem; margin: .5rem 0; }
.dl dt { color: var(--muted); }
.dl dd { margin: 0; }
video.preview { width: 100%; max-height: 360px; background: #000; border-radius: var(--radius); }

/* preset picker */
.picker { display: grid; grid-template-columns: 1fr auto 1fr; gap: 1rem; align-items: center; margin-top: .5rem; }
.picker select { width: 100%; font: inherit; border: 1px solid #c9d2dc; border-radius: var(--radius); }
.picker-title { font-weight: 600; margin-bottom: .3rem; }
.picker-btns { display: flex; flex-direction: column; gap: .4rem; }