@font-face {
  font-family: 'TH SarabunPSK';
  src: url('/fonts/THSarabunPSK.ttf') format('truetype');
  font-weight: 400;
  font-display: swap;
}
@font-face {
  font-family: 'TH SarabunPSK';
  src: url('/fonts/THSarabunPSK-Bold.ttf') format('truetype');
  font-weight: 700;
  font-display: swap;
}

:root {
  --bg: #f4f6f9;
  --surface: #ffffff;
  --text: #1d2433;
  --muted: #5d6779;
  --border: #d9dee7;
  --primary: #1f4e8c;
  --primary-hover: #183f72;
  --primary-soft: #e7eef8;
  --danger: #b42318;
  --danger-soft: #fdecea;
  --success: #1a7f37;
  --success-soft: #e6f4ea;
  --warn: #9a6700;
  --warn-soft: #fff4d6;
  --radius: 8px;
  --shadow: 0 1px 2px rgba(16, 24, 40, .06), 0 1px 3px rgba(16, 24, 40, .08);
}

* { box-sizing: border-box; }
html { font-size: 20px; }
body {
  margin: 0;
  font-family: 'TH SarabunPSK', 'Sarabun', Tahoma, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.35;
}
h1, h2, h3 { line-height: 1.2; margin: 0 0 .5rem; }
h1 { font-size: 1.8rem; }
h2 { font-size: 1.45rem; }
h3 { font-size: 1.2rem; }
a { color: var(--primary); }

/* ----- ปุ่ม / ฟอร์ม ----- */
button, .btn {
  font: inherit;
  font-size: 1rem;
  border: 1px solid var(--primary);
  background: var(--primary);
  color: #fff;
  border-radius: var(--radius);
  padding: .3rem .9rem;
  cursor: pointer;
  text-decoration: none;
  display: inline-block;
  white-space: nowrap;
}
button:hover, .btn:hover { background: var(--primary-hover); }
button:disabled { opacity: .55; cursor: not-allowed; }
button.secondary { background: var(--surface); color: var(--primary); }
button.secondary:hover { background: var(--primary-soft); }
button.danger { background: var(--surface); color: var(--danger); border-color: var(--danger); }
button.danger:hover { background: var(--danger-soft); }
button.small { font-size: .9rem; padding: .1rem .6rem; }

label { display: block; font-weight: 700; margin-bottom: .15rem; }
input, select {
  font: inherit;
  font-size: 1.05rem;
  width: 100%;
  padding: .3rem .6rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: #fff;
  color: var(--text);
}
input:focus, select:focus { outline: 2px solid var(--primary); outline-offset: -1px; border-color: var(--primary); }
.field { margin-bottom: .8rem; }
.hint { color: var(--muted); font-size: .9rem; }
.row { display: flex; gap: .75rem; flex-wrap: wrap; align-items: flex-end; }
.row > .field { flex: 1 1 180px; margin-bottom: 0; }

.msg { padding: .45rem .8rem; border-radius: var(--radius); margin: .6rem 0; }
.msg.error { background: var(--danger-soft); color: var(--danger); }
.msg.ok { background: var(--success-soft); color: var(--success); }
.msg.warn { background: var(--warn-soft); color: var(--warn); }
.hidden { display: none !important; }

/* ----- การ์ด / ตาราง ----- */
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  box-shadow: var(--shadow);
  padding: 1.1rem 1.3rem;
  margin-bottom: 1rem;
}
.table-wrap { overflow-x: auto; }
table.data { width: 100%; border-collapse: collapse; }
table.data th, table.data td { border-bottom: 1px solid var(--border); padding: .35rem .5rem; text-align: left; vertical-align: middle; }
table.data th { background: var(--primary-soft); font-weight: 700; }
.badge { display: inline-block; padding: 0 .55rem; border-radius: 99px; font-size: .9rem; }
.badge.green { background: var(--success-soft); color: var(--success); }
.badge.gray { background: #eceff3; color: var(--muted); }
.badge.blue { background: var(--primary-soft); color: var(--primary); }
.badge.yellow { background: var(--warn-soft); color: var(--warn); }
.actions { display: flex; gap: .35rem; flex-wrap: wrap; }

/* ----- หน้ากลาง (ล็อกอิน / ตั้งค่า / ค้นผล) ----- */
.center-page { min-height: 100vh; display: grid; place-items: center; padding: 16px; }
.center-box { width: 100%; max-width: 420px; }
.brand { text-align: center; margin-bottom: 1rem; }
.brand .school { color: var(--muted); }

/* ----- เค้าโครงแอป ----- */
.topbar {
  background: var(--primary);
  color: #fff;
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: .4rem 1rem;
  flex-wrap: wrap;
}
.topbar .title { font-weight: 700; font-size: 1.25rem; margin-right: auto; }
.topbar select { width: auto; padding: .1rem .5rem; }
.topbar .who { font-size: .95rem; }
.topbar button { background: transparent; border-color: rgba(255,255,255,.6); }
.topbar button:hover { background: rgba(255,255,255,.15); }

.layout { display: flex; min-height: calc(100vh - 52px); }
nav.side {
  width: 220px;
  flex-shrink: 0;
  background: var(--surface);
  border-right: 1px solid var(--border);
  padding: .75rem .5rem;
}
nav.side a {
  display: block;
  padding: .35rem .75rem;
  border-radius: var(--radius);
  color: var(--text);
  text-decoration: none;
}
nav.side a:hover { background: var(--bg); }
nav.side a.active { background: var(--primary-soft); color: var(--primary); font-weight: 700; }
nav.side .group { color: var(--muted); font-size: .85rem; padding: .6rem .75rem .1rem; }
nav.side a.soon { color: var(--muted); }
main.content { flex: 1; padding: 1.2rem; min-width: 0; }

@media (max-width: 760px) {
  .layout { flex-direction: column; }
  nav.side { width: auto; border-right: 0; border-bottom: 1px solid var(--border); display: flex; flex-wrap: wrap; gap: .25rem; }
  nav.side .group { display: none; }
  main.content { padding: 16px; }
}