/* ===== ប្រព័ន្ធគ្រប់គ្រងសាលារៀន (នាយកសាលា) — ពណ៌បៃតងចាស់ ដើម្បីបែងចែកពីប្រព័ន្ធគ្រូ ===== */
:root{
  --p-900:#0B3B36; --p-700:#0F6B5F; --p-600:#13897A; --p-050:#E9F7F4;
  --bg:#EEF5F3; --surface:#fff; --ink:#15302C; --muted:#5E7571;
  --border:#D6E7E3; --focus:#2BAE9B; --danger:#D6455B; --gold:#F2B33D;
  --r-lg:20px; --r-md:12px; --shadow:0 20px 45px -22px rgba(11,59,54,.35);
}
*{box-sizing:border-box}
body{margin:0;min-height:100vh;font-family:'Kantumruy Pro',sans-serif;color:var(--ink);
  background:radial-gradient(720px 420px at 100% -10%,rgba(19,137,122,.16),transparent 60%),var(--bg);
  -webkit-font-smoothing:antialiased}
a{color:var(--p-700)}

/* top bar */
.p-top{position:sticky;top:0;z-index:60;display:flex;align-items:center;gap:14px;
  padding:16px 18px;padding-top:calc(16px + env(safe-area-inset-top));
  background:linear-gradient(135deg,var(--p-700),var(--p-900));border-radius:0 0 22px 22px;
  box-shadow:0 12px 28px -10px rgba(11,59,54,.5);color:#fff}
.p-icon-btn{flex:none;width:42px;height:42px;border-radius:50%;display:flex;align-items:center;justify-content:center;
  background:rgba(255,255,255,.16);color:#fff;text-decoration:none;border:none;cursor:pointer;font-size:1rem}
.p-icon-btn:hover{background:rgba(255,255,255,.28)}
.p-top-title{min-width:0;flex:1}
.p-top-title h1{font-size:1.1rem;margin:0 0 2px;line-height:1.4;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.p-top-title p{margin:0;font-size:.8rem;opacity:.88;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}

.page{max-width:1100px;margin:0 auto;padding:22px 16px 56px}
.page.narrow{max-width:720px}
.card{background:var(--surface);border-radius:var(--r-lg);box-shadow:var(--shadow);padding:28px;border:1px solid rgba(11,59,54,.05)}

/* forms */
.form-section{padding-block:18px;border-bottom:1px solid var(--border)}
.form-section:last-of-type{border-bottom:none}
.section-heading{display:flex;align-items:center;gap:10px;margin:0 0 14px;font-size:.98rem;color:var(--p-900)}
.section-heading i{width:30px;height:30px;border-radius:9px;background:var(--p-050);color:var(--p-700);display:flex;align-items:center;justify-content:center;font-size:.85rem}
.row{display:grid;grid-template-columns:1fr 1fr;gap:14px}
.row + .row,.field + .row,.row + .field{margin-top:14px}
.row.three{grid-template-columns:1fr 1fr 1fr}
.field{display:flex;flex-direction:column;gap:6px}
.field label{font-size:.82rem;font-weight:600;color:var(--muted)}
.field input,.field select{font-family:inherit;font-size:.95rem;color:var(--ink);padding:12px 14px;border-radius:var(--r-md);
  border:1.5px solid var(--border);background:#fff;width:100%}
.field input:focus,.field select:focus{outline:none;border-color:var(--focus);box-shadow:0 0 0 4px rgba(43,174,155,.15)}
.field small{font-size:.74rem;color:var(--muted)}
.pills{display:flex;gap:10px}
.pills input{position:absolute;opacity:0;pointer-events:none}
.pills label{flex:1;display:flex;align-items:center;justify-content:center;gap:8px;padding:11px;border-radius:var(--r-md);
  border:1.5px solid var(--border);font-weight:600;color:var(--muted);cursor:pointer}
.pills input:checked + label{border-color:var(--p-700);background:var(--p-050);color:var(--p-900)}
.pw-wrap{position:relative;display:flex;align-items:center}
.pw-wrap input{padding-right:44px}
.pw-toggle{position:absolute;right:6px;width:34px;height:34px;border:none;background:transparent;color:#8aa09c;cursor:pointer;border-radius:50%}
.pw-toggle:hover{color:var(--p-700);background:var(--p-050)}

.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;font-family:inherit;font-weight:700;font-size:.92rem;
  padding:11px 18px;border-radius:var(--r-md);border:1.5px solid var(--p-700);background:#fff;color:var(--p-700);cursor:pointer;text-decoration:none}
.btn:hover{background:var(--p-050)}
.btn-primary{width:100%;padding:15px;font-size:1rem;color:#fff;border:none;
  background:linear-gradient(135deg,var(--p-600),var(--p-900));box-shadow:0 14px 26px -12px rgba(15,107,95,.6)}
.btn-primary:hover{background:linear-gradient(135deg,var(--p-700),var(--p-900))}
.btn-sm{padding:7px 12px;font-size:.82rem}
.btn-danger{border-color:var(--danger);color:var(--danger)}
.center-links{text-align:center;margin-top:16px;font-size:.88rem;color:var(--muted)}

.alert{padding:12px 14px;border-radius:var(--r-md);font-size:.88rem;margin-bottom:16px;line-height:1.6}
.alert.error{background:#FDECEF;color:#A32035;border:1px solid #F6C6CF}
.alert.ok{background:var(--p-050);color:var(--p-900);border:1px solid #BFE5DD}
.alert.warn{background:#FFF6E3;color:#7A5308;border:1px solid #F5DDA6}

/* stats */
.stats{display:grid;grid-template-columns:repeat(auto-fit,minmax(160px,1fr));gap:14px;margin-bottom:20px}
.stat{background:#fff;border-radius:16px;padding:16px;box-shadow:0 10px 24px -18px rgba(11,59,54,.4);display:flex;gap:12px;align-items:center}
.stat i{width:44px;height:44px;border-radius:12px;display:flex;align-items:center;justify-content:center;color:#fff;font-size:1.1rem;flex:none}
.stat b{display:block;font-size:1.35rem;line-height:1.2}
.stat span{font-size:.8rem;color:var(--muted)}

/* menu grid (ដូច index របស់ប្រព័ន្ធគ្រូ) */
.menu-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(160px,1fr));gap:18px;margin:6px 0 24px}
.menu-card{background:#fff;padding:24px 14px;border-radius:20px;text-align:center;text-decoration:none;
  box-shadow:0 10px 20px rgba(0,0,0,.05);display:flex;flex-direction:column;align-items:center;gap:14px;
  border-bottom:4px solid transparent;transition:.25s}
.menu-card:hover{transform:translateY(-5px);border-bottom-color:var(--p-600)}
.menu-card .ib{width:60px;height:60px;border-radius:50%;display:flex;align-items:center;justify-content:center;color:#fff;font-size:1.4rem}
.menu-card span{font-weight:700;color:#333;font-size:.98rem}

/* tables */
.toolbar{display:flex;flex-wrap:wrap;gap:10px;align-items:center;margin-bottom:14px}
.toolbar .search{flex:1;min-width:200px;position:relative}
.toolbar .search input{width:100%;padding:11px 14px 11px 38px;border-radius:var(--r-md);border:1.5px solid var(--border);font-family:inherit;font-size:.92rem}
.toolbar .search i{position:absolute;left:13px;top:50%;transform:translateY(-50%);color:#8aa09c}
.toolbar select{padding:11px 12px;border-radius:var(--r-md);border:1.5px solid var(--border);font-family:inherit;font-size:.9rem;background:#fff}
.table-wrap{overflow-x:auto;background:#fff;border-radius:16px;box-shadow:var(--shadow)}
table.data{width:100%;border-collapse:collapse;font-size:.88rem;min-width:760px}
table.data th{background:var(--p-050);color:var(--p-900);text-align:left;padding:11px 12px;font-weight:700;white-space:nowrap;position:sticky;top:0}
table.data td{padding:10px 12px;border-top:1px solid var(--border);vertical-align:middle}
table.data tr:hover td{background:#F7FBFA}
table.data td.num,table.data th.num{text-align:center}
.avatar{width:38px;height:38px;border-radius:50%;object-fit:cover;background:var(--p-050);display:inline-flex;align-items:center;justify-content:center;color:var(--p-700);vertical-align:middle}
.badge{display:inline-block;padding:3px 9px;border-radius:100px;font-size:.75rem;font-weight:700;background:var(--p-050);color:var(--p-700)}
.badge.f{background:#FDECF3;color:#B0306A}
.badge.warn{background:#FFF6E3;color:#7A5308}
.badge.red{background:#FDECEF;color:#A32035}
.muted{color:var(--muted)}
.empty{text-align:center;padding:40px 16px;color:var(--muted)}

/* class cards */
.grade-block{margin-bottom:22px}
.grade-block h2{font-size:1rem;color:var(--p-900);margin:0 0 10px;display:flex;align-items:center;gap:8px}
.class-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(210px,1fr));gap:14px}
.class-card{background:#fff;border-radius:16px;padding:16px;text-decoration:none;color:inherit;box-shadow:0 10px 24px -18px rgba(11,59,54,.45);
  border:1.5px solid transparent;transition:.2s;display:flex;flex-direction:column;gap:8px}
.class-card:hover{border-color:var(--p-600);transform:translateY(-3px)}
.class-card .cname{font-size:1.15rem;font-weight:800;color:var(--p-700)}
.class-card .teacher{font-size:.85rem;color:var(--muted);display:flex;gap:6px;align-items:center}
.class-card .counts{display:flex;gap:8px;flex-wrap:wrap}

details.tdetail summary{cursor:pointer;color:var(--p-700);font-weight:600;font-size:.82rem;list-style:none}
details.tdetail summary::-webkit-details-marker{display:none}
.kv{display:grid;grid-template-columns:auto 1fr;gap:4px 12px;font-size:.84rem;margin-top:8px}
.kv dt{color:var(--muted)} .kv dd{margin:0}

.footer{text-align:center;font-size:.8rem;color:var(--muted);padding:20px}

@media (max-width:600px){
  .row,.row.three{grid-template-columns:1fr}
  .card{padding:20px 16px}
  .menu-grid{grid-template-columns:repeat(2,1fr);gap:12px}
  .stats{grid-template-columns:repeat(2,1fr)}
}
@media print{
  .p-top,.toolbar,.no-print{display:none!important}
  body{background:#fff} .table-wrap{box-shadow:none}
  table.data{min-width:0;font-size:11px}
}