:root{
  --ink:#18213a;
  --ink-soft:#3a4458;
  --primary:#4338ca;
  --primary-dark:#312e81;
  --primary-soft:#eef0fc;
  --gold:#b8860b;
  --gold-soft:#f6efda;
  --bg:#f5f6fb;
  --surface:#ffffff;
  --muted:#6b7280;
  --line:#e6e8f0;
  --success:#15824b;
  --success-soft:#e7f5ee;
  --danger:#c2410c;
  --danger-soft:#fdeee6;
  --info:#1d4ed8;
  --info-soft:#e8effd;
  --radius:14px;
  --radius-sm:10px;
  --shadow:0 1px 2px rgba(24,33,58,.06),0 8px 24px -12px rgba(24,33,58,.18);
  --shadow-sm:0 1px 2px rgba(24,33,58,.08);
}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{
  margin:0;font-family:'Inter',system-ui,-apple-system,Segoe UI,Roboto,sans-serif;
  color:var(--ink);background:var(--bg);line-height:1.6;font-size:16px;
}
h1,h2,h3,h4,.brand-name{font-family:'Lexend',sans-serif;color:var(--ink);line-height:1.25;font-weight:600}
h1{font-size:1.9rem;margin:.2em 0 .5em} h2{font-size:1.4rem} h3{font-size:1.15rem}
a{color:var(--primary);text-decoration:none}
a:hover{text-decoration:underline}
.wrap{max-width:1080px;margin:0 auto;padding:0 20px}
.page{padding:28px 20px 64px}
p{margin:.4em 0 .9em}
.muted{color:var(--muted)}
.small{font-size:.86rem}
.center{text-align:center}

/* ---- Topbar ---- */
.topbar{background:var(--surface);border-bottom:1px solid var(--line);position:sticky;top:0;z-index:40}
.topbar-inner{display:flex;align-items:center;justify-content:space-between;height:64px;gap:16px}
.brand{display:flex;align-items:center;gap:10px;font-weight:700;color:var(--ink)}
.brand:hover{text-decoration:none}
.brand-mark{display:grid;place-items:center;width:36px;height:36px;border-radius:10px;
  background:linear-gradient(135deg,var(--primary),var(--primary-dark));color:#fff;font-family:'Lexend';font-weight:700}
.brand-mark sup{font-size:.6em}
.brand-name{font-size:1.12rem}
.nav{display:flex;align-items:center;gap:18px}
.nav a{color:var(--ink-soft);font-weight:500;font-size:.95rem}
.nav a:hover{color:var(--primary);text-decoration:none}
.nav-toggle{display:none;background:none;border:0;font-size:1.6rem;cursor:pointer;color:var(--ink)}

/* ---- Buttons ---- */
.btn{display:inline-flex;align-items:center;gap:8px;justify-content:center;
  border:1px solid transparent;border-radius:var(--radius-sm);padding:11px 18px;
  font:inherit;font-weight:600;cursor:pointer;transition:.15s;text-decoration:none;line-height:1}
.btn:hover{text-decoration:none}
.btn-sm{padding:8px 14px;font-size:.9rem}
.btn-lg{padding:14px 26px;font-size:1.05rem}
.btn-primary{background:var(--primary);color:#fff}
.btn-primary:hover{background:var(--primary-dark)}
.btn-gold{background:var(--gold);color:#fff}
.btn-gold:hover{filter:brightness(.94)}
.btn-ghost{background:transparent;border-color:var(--line);color:var(--ink)}
.btn-ghost:hover{border-color:var(--primary);color:var(--primary)}
.btn-danger{background:var(--danger);color:#fff}
.btn-block{width:100%}
.btn:disabled{opacity:.5;cursor:not-allowed}

/* ---- Cards & layout ---- */
.card{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);
  box-shadow:var(--shadow-sm);padding:24px}
.card+.card{margin-top:18px}
.grid{display:grid;gap:18px}
.grid-2{grid-template-columns:repeat(2,1fr)}
.grid-3{grid-template-columns:repeat(3,1fr)}
.row{display:flex;gap:14px;flex-wrap:wrap;align-items:center}
.between{justify-content:space-between}
.stack>*+*{margin-top:14px}
.divider{height:1px;background:var(--line);margin:20px 0;border:0}

/* ---- Forms ---- */
.field{margin-bottom:16px}
label{display:block;font-weight:600;font-size:.92rem;margin-bottom:6px;color:var(--ink-soft)}
input[type=text],input[type=email],input[type=password],input[type=number],input[type=url],
select,textarea{
  width:100%;padding:11px 13px;border:1px solid var(--line);border-radius:var(--radius-sm);
  font:inherit;color:var(--ink);background:#fff;transition:.15s}
input:focus,select:focus,textarea:focus{outline:none;border-color:var(--primary);
  box-shadow:0 0 0 3px var(--primary-soft)}
textarea{min-height:120px;resize:vertical}
.help{font-size:.82rem;color:var(--muted);margin-top:5px}
.auth-box{max-width:430px;margin:30px auto}
.pw-wrap{position:relative}
.pw-wrap input{padding-right:44px}
.pw-toggle{position:absolute;right:8px;top:50%;transform:translateY(-50%);background:none;border:0;
  cursor:pointer;font-size:1.1rem;color:var(--muted);padding:6px}

/* ---- Alerts ---- */
.alert{padding:12px 16px;border-radius:var(--radius-sm);margin-bottom:16px;font-size:.95rem;border:1px solid}
.alert-success{background:var(--success-soft);border-color:#bfe6d0;color:#0f5132}
.alert-error{background:var(--danger-soft);border-color:#f3cbb6;color:#8a2c06}
.alert-info{background:var(--info-soft);border-color:#c3d4fb;color:#1e3a8a}

/* ---- Badges & pills ---- */
.badge{display:inline-block;padding:3px 10px;border-radius:999px;font-size:.74rem;font-weight:600;letter-spacing:.02em}
.badge-primary{background:var(--primary-soft);color:var(--primary-dark)}
.badge-gold{background:var(--gold-soft);color:#7a5a06}
.badge-green{background:var(--success-soft);color:#0f5132}
.badge-gray{background:#eef0f4;color:#475569}
.tag-level{text-transform:capitalize}

/* ---- Hero (landing) ---- */
.hero{background:linear-gradient(135deg,#1e1b4b 0%,#312e81 55%,#4338ca 100%);
  color:#fff;border-radius:20px;padding:56px 40px;position:relative;overflow:hidden}
.hero::after{content:"A+";position:absolute;right:-10px;bottom:-30px;font-family:'Lexend';
  font-size:13rem;font-weight:700;color:rgba(255,255,255,.06);line-height:1}
.hero h1{color:#fff;font-size:2.5rem;max-width:18ch}
.hero p{color:#dcdcf5;max-width:52ch;font-size:1.08rem}
.hero .row{margin-top:8px}

/* ---- Course cards ---- */
.course-card{display:flex;flex-direction:column;overflow:hidden;padding:0}
.course-cover{aspect-ratio:16/9;background:linear-gradient(135deg,var(--primary-soft),#dfe3fb);
  display:grid;place-items:center;color:var(--primary-dark);font-family:'Lexend';font-weight:700;font-size:2rem}
.course-cover img{width:100%;height:100%;object-fit:cover}
.course-body{padding:18px 20px;display:flex;flex-direction:column;gap:8px;flex:1}
.course-body h3{margin:0}
.course-body .desc{color:var(--muted);font-size:.92rem;flex:1}

/* ---- Progress bar ---- */
.progress{height:9px;border-radius:999px;background:#e9ebf4;overflow:hidden}
.progress>span{display:block;height:100%;background:linear-gradient(90deg,var(--primary),#6d63e6);border-radius:999px}

/* ---- Lesson list ---- */
.lesson-list{list-style:none;padding:0;margin:0;border:1px solid var(--line);border-radius:var(--radius);overflow:hidden}
.lesson-list li{display:flex;align-items:center;gap:12px;padding:14px 18px;border-top:1px solid var(--line)}
.lesson-list li:first-child{border-top:0}
.lesson-list li:hover{background:#fafbff}
.lesson-ico{width:34px;height:34px;border-radius:9px;display:grid;place-items:center;flex:none;
  background:var(--primary-soft);color:var(--primary-dark);font-size:1.05rem}
.lesson-meta{flex:1}
.lesson-meta a{font-weight:600;color:var(--ink)}
.check{color:var(--success);font-weight:700}

/* ---- Media ---- */
.media audio,.media video{width:100%;border-radius:var(--radius-sm);margin:10px 0}
.video-embed{position:relative;padding-top:56.25%;border-radius:var(--radius-sm);overflow:hidden;background:#000}
.video-embed iframe{position:absolute;inset:0;width:100%;height:100%;border:0}
.lesson-text{white-space:pre-wrap}

/* ---- Tables ---- */
table.tbl{width:100%;border-collapse:collapse;font-size:.94rem}
table.tbl th,table.tbl td{padding:11px 12px;text-align:left;border-bottom:1px solid var(--line)}
table.tbl th{font-family:'Lexend';font-weight:600;color:var(--ink-soft);font-size:.85rem;text-transform:uppercase;letter-spacing:.03em}
table.tbl tr:hover td{background:#fafbff}
.tbl-wrap{overflow-x:auto}

/* ---- Stat tiles ---- */
.stat{padding:20px}
.stat .n{font-family:'Lexend';font-size:2rem;font-weight:700;color:var(--primary-dark)}
.stat .l{color:var(--muted);font-size:.9rem}

/* ---- Quiz ---- */
.q-block{padding:18px 20px;border:1px solid var(--line);border-radius:var(--radius);margin-bottom:14px}
.q-block .q-num{color:var(--primary);font-weight:700;font-family:'Lexend'}
.opt{display:flex;align-items:flex-start;gap:10px;padding:10px 12px;border:1px solid var(--line);
  border-radius:var(--radius-sm);margin-top:8px;cursor:pointer}
.opt:hover{border-color:var(--primary);background:var(--primary-soft)}
.opt input{margin-top:4px}
.score-ring{width:120px;height:120px;border-radius:50%;display:grid;place-items:center;margin:0 auto;
  font-family:'Lexend';font-weight:700;font-size:1.8rem;color:#fff}

/* ---- Certificate ---- */
.cert-stage{background:#eceef6;padding:30px 12px;border-radius:var(--radius);display:grid;place-items:center}
.certificate{width:920px;max-width:100%;aspect-ratio:1.414/1;background:#fffdf8;color:#2a2a2a;
  border:2px solid var(--gold);box-shadow:0 12px 40px -12px rgba(0,0,0,.3);position:relative;
  padding:48px 60px;display:flex;flex-direction:column;font-family:'Inter'}
.certificate::before{content:"";position:absolute;inset:14px;border:1px solid rgba(184,134,11,.45);pointer-events:none}
.cert-head{text-align:center}
.cert-eyebrow{letter-spacing:.32em;text-transform:uppercase;color:var(--gold);font-weight:600;font-size:.8rem}
.cert-title{font-family:'Lexend';font-size:2.4rem;font-weight:700;margin:6px 0 0;color:#1e1b4b}
.cert-body{flex:1;display:flex;flex-direction:column;align-items:center;justify-content:center;text-align:center;gap:6px}
.cert-name{font-family:'Lexend';font-size:2.1rem;font-weight:700;color:#1e1b4b;
  border-bottom:2px solid var(--gold);display:inline-block;padding:0 24px 6px;margin:6px auto}
.cert-course{font-size:1.25rem;font-weight:600}
.cert-foot{display:flex;justify-content:space-between;align-items:flex-end;gap:20px}
.cert-sign{text-align:center;min-width:180px}
.cert-sign .line{border-top:1.5px solid #555;padding-top:6px;font-weight:600}
.cert-qr{text-align:center}
.cert-qr canvas,.cert-qr img{width:104px;height:104px}
.cert-code{font-family:monospace;font-size:.78rem;color:#666;margin-top:4px}
.cert-seal{position:absolute;right:54px;top:50%;transform:translateY(-50%);width:96px;height:96px;
  border-radius:50%;border:3px double var(--gold);display:grid;place-items:center;color:var(--gold);
  font-family:'Lexend';font-weight:700;text-align:center;font-size:.7rem;opacity:.9}

/* ---- Verify page ---- */
.verify-status{display:flex;align-items:center;gap:14px;padding:18px 22px;border-radius:var(--radius);font-weight:600}
.verify-ok{background:var(--success-soft);color:#0f5132;border:1px solid #bfe6d0}
.verify-bad{background:var(--danger-soft);color:#8a2c06;border:1px solid #f3cbb6}
.verify-ico{font-size:1.8rem}

.footer{border-top:1px solid var(--line);background:var(--surface);color:var(--muted);
  padding:24px 0;font-size:.9rem;text-align:center}

/* ---- Responsive ---- */
@media(max-width:860px){
  .grid-3{grid-template-columns:repeat(2,1fr)}
}
@media(max-width:680px){
  .grid-2,.grid-3{grid-template-columns:1fr}
  .hero{padding:38px 24px}.hero h1{font-size:1.9rem}
  .nav{position:absolute;top:64px;left:0;right:0;background:var(--surface);flex-direction:column;
    align-items:stretch;gap:0;border-bottom:1px solid var(--line);padding:8px 20px;display:none}
  .nav a{padding:12px 0;border-bottom:1px solid var(--line)}
  body.nav-open .nav{display:flex}
  .nav-toggle{display:block}
  .certificate{padding:30px 26px}
  .cert-seal{display:none}
}

/* ---- Print (sertifikat) ---- */
@media print{
  .topbar,.footer,.no-print{display:none!important}
  body{background:#fff}
  .page{padding:0}
  .cert-stage{background:#fff;padding:0}
  .certificate{box-shadow:none;width:100%;border-color:var(--gold)}
  @page{size:A4 landscape;margin:10mm}
}