:root{
  --navy:#17304f; --navy2:#0f2238; --blue:#2f6fd0; --blue-soft:#dce9f8; --blue-line:#9dbbe3;
  --green:#2e7d4f; --green-soft:#e3f1e6; --bg:#f3f5f9; --card:#fff; --line:#dfe4ec;
  --text:#1c2733; --muted:#66727f; --red:#c0392b; --amber:#b7791f; --radius:10px;
}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;font-family:'IBM Plex Sans Thai','Sarabun','Leelawadee UI',Tahoma,sans-serif;font-size:15px;line-height:1.6;color:var(--text);background:var(--bg)}
a{color:var(--blue);text-decoration:none}
a:hover{text-decoration:underline}
h1,h2,h3{line-height:1.3;margin:0 0 .5em}
h1{font-size:1.6rem} h2{font-size:1.2rem} h3{font-size:1.02rem}
.wrap{max-width:1180px;margin:0 auto;padding:0 20px}
.main{padding-top:24px;padding-bottom:48px;min-height:70vh}
.muted{color:var(--muted)} .small{font-size:.86rem} .right{text-align:right} .nowrap{white-space:nowrap}
.mt{margin-top:24px} .mb{margin-bottom:16px}

/* top bar */
.topbar{background:var(--navy);color:#fff;position:sticky;top:0;z-index:20}
.topbar-in{display:flex;align-items:center;gap:20px;min-height:58px}
.brand{display:flex;align-items:center;gap:10px;color:#fff;font-weight:600;white-space:nowrap}
.brand:hover{text-decoration:none}
.brand-mark{background:#fff;color:var(--navy);font-weight:700;border-radius:7px;padding:2px 8px;font-size:.85rem;letter-spacing:.5px}
.mainnav{display:flex;flex-wrap:wrap;gap:2px;margin-left:auto;align-items:center}
.mainnav a{color:#d5deea;padding:7px 11px;border-radius:7px;font-size:.92rem}
.mainnav a:hover,.mainnav a.on{background:rgba(255,255,255,.13);color:#fff;text-decoration:none}
.mainnav .nav-admin{border:1px solid rgba(255,255,255,.35)}
.badge{background:#ffb648;color:#3b2500;border-radius:20px;padding:0 7px;font-size:.75rem;font-weight:700}
.nav-toggle{display:none;background:none;border:0;color:inherit;font-size:1.4rem;cursor:pointer;margin-left:auto}
.foot{border-top:1px solid var(--line);padding:18px 0;color:var(--muted);font-size:.85rem;background:#fff}

/* components */
.card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:18px}
.grid{display:grid;gap:16px}
.g2{grid-template-columns:repeat(2,minmax(0,1fr))} .g3{grid-template-columns:repeat(3,minmax(0,1fr))} .g4{grid-template-columns:repeat(4,minmax(0,1fr))}
.split{display:grid;grid-template-columns:minmax(0,2fr) minmax(0,1fr);gap:20px;align-items:start}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:6px;border:1px solid transparent;border-radius:8px;padding:8px 14px;font:inherit;font-size:.92rem;font-weight:500;cursor:pointer;background:#e8ecf2;color:var(--text);white-space:nowrap}
.btn:hover{text-decoration:none;filter:brightness(.96)}
.btn-primary{background:var(--blue);color:#fff}
.btn-navy{background:var(--navy);color:#fff}
.btn-light{background:#fff;border-color:var(--line)}
.btn-added{background:var(--green-soft);color:var(--green);border-color:#a9d1b4}
.btn-danger{background:#fff;color:var(--red);border-color:#e6b8b2}
.btn-sm{padding:4px 9px;font-size:.82rem;border-radius:6px}
.btn[disabled]{opacity:.5;cursor:not-allowed}
.btns{display:flex;flex-wrap:wrap;gap:8px;align-items:center}
.chip{display:inline-block;border-radius:20px;padding:1px 10px;font-size:.78rem;background:#eef1f5;color:#44505c;border:1px solid var(--line)}
.chip-cat{background:var(--blue-soft);border-color:var(--blue-line);color:#1d4a8c}
.chip-star{background:#fff3d6;border-color:#ecd08a;color:#7a5600}
.chip-green{background:var(--green-soft);border-color:#a9d1b4;color:var(--green)}
.chip-red{background:#fbe6e3;border-color:#e6b8b2;color:var(--red)}
.chip-gray{background:#eceff3;color:#5d6875}
a.chip:hover{text-decoration:none;border-color:var(--blue)}
.alert{padding:10px 14px;border-radius:8px;margin-bottom:14px;border:1px solid}
.alert-ok{background:var(--green-soft);border-color:#a9d1b4;color:#1e5a37}
.alert-err{background:#fbe6e3;border-color:#e6b8b2;color:#8c2a20}
.alert-info{background:var(--blue-soft);border-color:var(--blue-line);color:#1d4a8c}

/* forms */
label{display:block;font-weight:500;font-size:.88rem;margin-bottom:4px}
input[type=text],input[type=email],input[type=password],input[type=number],input[type=date],input[type=url],input[type=search],select,textarea{
  width:100%;font:inherit;padding:8px 10px;border:1px solid #c9d1dc;border-radius:8px;background:#fff;color:var(--text)}
input:focus,select:focus,textarea:focus{outline:2px solid var(--blue-line);border-color:var(--blue)}
textarea{min-height:96px;resize:vertical}
.field{margin-bottom:14px}
.hint{font-size:.8rem;color:var(--muted);margin-top:3px}
.check{display:flex;gap:8px;align-items:center;font-weight:400}
.check input{width:auto}
.inline{display:flex;gap:8px;align-items:center;flex-wrap:wrap}
.inline > *{flex:0 1 auto}
form.inline-form{display:inline}

/* hero + search */
.hero{background:linear-gradient(135deg,var(--navy),#244a78);color:#fff;border-radius:14px;padding:30px 28px;margin-bottom:24px}
.hero h1{font-size:1.7rem;margin-bottom:4px}
.hero p{margin:0 0 16px;color:#cfdbea}
.hero form{display:flex;gap:8px;max-width:640px}
.hero input{border:0;padding:11px 14px}
.sec-h{display:flex;justify-content:space-between;align-items:baseline;margin:26px 0 12px}
.sec-h h2{margin:0}
.filters{display:grid;grid-template-columns:2fr repeat(4,1fr) auto;gap:10px;align-items:end;margin-bottom:18px}

/* course card */
.course-card{display:flex;flex-direction:column;gap:8px}
.course-card h3{margin:0}
.course-card h3 a{color:var(--text)}
.cc-top{display:flex;gap:6px;flex-wrap:wrap}
.cc-sum{margin:0;color:var(--muted);font-size:.88rem;flex:1}
.cc-meta{display:flex;gap:14px;font-size:.85rem;color:#44505c;flex-wrap:wrap}
.cc-media{display:flex;gap:6px}
.mtag{font-size:.75rem;padding:1px 8px;border-radius:5px;background:#f0f2f5;color:#9aa3ad}
.mtag.has{background:var(--green-soft);color:var(--green);font-weight:600}
.cc-act{display:flex;gap:8px;margin-top:4px}
.cc-act .btn{flex:1}
.ann{border-left:4px solid var(--blue);margin-bottom:10px}
.ann.pin{border-left-color:#e0a019}
.ann h3{margin-bottom:2px}
.ann p{margin:4px 0 0;white-space:pre-line}

/* detail */
.crumb{font-size:.85rem;color:var(--muted);margin-bottom:10px}
.facts{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:12px;margin:16px 0}
.fact{background:#f7f9fc;border:1px solid var(--line);border-radius:8px;padding:10px 12px}
.fact span{display:block;font-size:.78rem;color:var(--muted)}
.fact b{font-weight:600}
.media-row{display:flex;gap:12px;align-items:center;padding:12px 0;border-top:1px solid var(--line)}
.media-row:first-of-type{border-top:0}
.mi{width:46px;height:46px;border-radius:9px;display:flex;align-items:center;justify-content:center;font-size:.72rem;font-weight:700;color:#fff;flex:none}
.mi-video,.mi-link{background:#7a4fc4} .mi-pdf{background:#c9483b} .mi-ppt{background:#d9772b}
.media-row .mt-info{flex:1;min-width:0}
.media-row .mt-info b{display:block;overflow-wrap:anywhere}
.viewer{background:#000;border-radius:10px;overflow:hidden}
.viewer video,.viewer iframe{display:block;width:100%;border:0}
.viewer video{max-height:74vh}
.viewer iframe{height:80vh;background:#fff}
.viewer.yt iframe{aspect-ratio:16/9;height:auto}

/* tables */
.table-wrap{overflow-x:auto}
table{width:100%;border-collapse:collapse;font-size:.9rem}
th,td{padding:9px 10px;text-align:left;border-bottom:1px solid var(--line);vertical-align:top}
th{font-size:.8rem;color:var(--muted);font-weight:600;white-space:nowrap;background:#f8f9fb}
td.act{white-space:nowrap;text-align:right}
td.num,th.num{text-align:right}
.pager{display:flex;gap:6px;justify-content:center;margin-top:20px;flex-wrap:wrap}
.pager a,.pager span{padding:5px 11px;border:1px solid var(--line);border-radius:7px;background:#fff;color:var(--text)}
.pager a.on{background:var(--navy);color:#fff;border-color:var(--navy)}
.empty{text-align:center;color:var(--muted);padding:36px 10px}

/* stats */
.stat{padding:14px 16px}
.stat span{display:block;font-size:.82rem;color:var(--muted)}
.stat b{font-size:1.6rem;font-weight:700;color:var(--navy)}
.bar{height:10px;background:#e6eaf0;border-radius:6px;overflow:hidden}
.bar i{display:block;height:100%;background:var(--blue)}
.bar.warn i{background:var(--amber)} .bar.full i{background:var(--red)}
.chart{display:flex;align-items:flex-end;gap:2px;height:120px;border-bottom:1px solid var(--line)}
.chart div{flex:1;background:var(--blue);min-height:1px;border-radius:2px 2px 0 0}
.chart div:hover{background:var(--navy)}
.hbar{display:grid;grid-template-columns:minmax(0,1fr) 44px;gap:4px 10px;align-items:center;font-size:.88rem}
.hbar .bar{grid-column:1/-1;height:6px;margin-bottom:6px}

/* login */
.auth{max-width:420px;margin:6vh auto}
.auth h1{text-align:center}
.auth .card{padding:26px}

/* admin */
body.admin{display:flex;min-height:100vh}
.side{width:262px;flex:none;background:var(--navy);color:#d5deea;padding:16px 12px;position:sticky;top:0;height:100vh;overflow-y:auto}
.side .brand{padding:4px 8px 14px}
.side-user{padding:10px;background:rgba(255,255,255,.07);border-radius:8px;margin-bottom:10px;font-size:.88rem;color:#fff}
.side-user b{display:block}
.role{display:inline-block;font-size:.74rem;border-radius:5px;padding:0 7px;background:var(--green-soft);color:var(--green);font-weight:600}
.role-3{background:#fde3e0;color:#9a2b20} .role-2{background:#fff3d6;color:#7a5600}
.side nav a{display:block;color:#d5deea;padding:7px 10px;border-radius:7px;font-size:.9rem}
.side nav a:hover,.side nav a.on{background:rgba(255,255,255,.13);color:#fff;text-decoration:none}
.side-h{font-size:.72rem;letter-spacing:.4px;color:#8fa3bb;padding:14px 10px 4px}
.admin-main{flex:1;min-width:0}
.admin-top{background:#fff;border-bottom:1px solid var(--line);padding:14px 24px;display:flex;align-items:center;gap:12px}
.admin-top h1{font-size:1.25rem;margin:0}
.admin-body{padding:22px 24px 60px}
.toolbar{display:flex;gap:10px;flex-wrap:wrap;align-items:end;margin-bottom:16px}
.toolbar .grow{flex:1;min-width:180px}
.progress{height:14px;background:#e6eaf0;border-radius:8px;overflow:hidden;margin-top:8px;display:none}
.progress i{display:block;height:100%;width:0;background:var(--green);transition:width .2s}
details.box{border:1px solid var(--line);border-radius:8px;padding:8px 12px;background:#fafbfc}
details.box summary{cursor:pointer;font-weight:500}
details.box[open] summary{margin-bottom:10px}

@media (max-width:980px){
  .g3,.g4{grid-template-columns:repeat(2,minmax(0,1fr))}
  .split{grid-template-columns:1fr}
  .filters{grid-template-columns:1fr 1fr}
  .facts{grid-template-columns:repeat(2,minmax(0,1fr))}
  .nav-toggle{display:block}
  .mainnav{display:none;width:100%;flex-direction:column;align-items:stretch;padding-bottom:10px}
  .topbar-in{flex-wrap:wrap}
  body.nav-open .mainnav{display:flex}
  .side{position:fixed;left:-280px;z-index:30;transition:left .2s}
  body.nav-open .side{left:0}
  .admin-top .nav-toggle{margin-left:0;color:var(--navy)}
}
@media (max-width:620px){
  .g2,.g3,.g4{grid-template-columns:1fr}
  .filters{grid-template-columns:1fr}
  .hero form{flex-direction:column}
  .media-row{flex-wrap:wrap}
}
@media print{
  .topbar,.foot,.no-print,.side,.admin-top{display:none!important}
  body{background:#fff;font-size:12px}
  .card{border:0;padding:0}
}