:root{
  --bg:#f7f7f5; --surface:#ffffff; --tint:#eef1f5;
  --ink:#21262e; --muted:#6a7280; --line:#e3e6ea;
  --blue:#2456a6; --blue-soft:#e8eef8;
  --pos:#1a7f5c; --pos-soft:#e4f3ec;
  --neg:#b3402e; --neg-soft:#f8e9e6;
  --neu:#9a6c08; --neu-soft:#f7f0dd;
  --mono:ui-monospace,'Cascadia Code',Consolas,monospace;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{background:var(--bg);color:var(--ink);font:15px/1.65 system-ui,-apple-system,'Segoe UI',Roboto,sans-serif}
.wrap{max-width:980px;margin:0 auto;padding:0 20px}
a{color:var(--blue)}

/* ── Header ── */
header{padding:44px 0 8px}
.eyebrow{font-size:12px;font-weight:600;letter-spacing:.12em;text-transform:uppercase;color:var(--blue)}
h1{font-size:clamp(24px,4.5vw,34px);font-weight:750;letter-spacing:-.02em;margin:6px 0 10px}
.lede{color:var(--muted);max-width:620px;margin-bottom:6px}
.flow-strip{display:flex;flex-wrap:wrap;align-items:center;gap:6px;margin:18px 0 30px;font-size:12.5px;color:var(--muted)}
.flow-strip b{color:var(--ink);font-weight:600}
.flow-strip .arr{color:#c2c8cf}

/* ── Form ── */
.panel{background:var(--surface);border-radius:14px;padding:24px;box-shadow:0 1px 3px rgba(20,30,50,.06)}
.form-grid{display:grid;grid-template-columns:2fr 1fr;gap:14px;margin-bottom:14px}
label{display:block;font-size:12.5px;font-weight:600;color:var(--muted);margin-bottom:5px}
input[type=text],input[type=number]{width:100%;background:var(--bg);border:1px solid var(--line);border-radius:9px;padding:11px 13px;font-size:14.5px;color:var(--ink);outline:none}
input:focus{border-color:var(--blue);background:#fff}
.hint{font-size:12px;color:var(--muted);margin-top:4px}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;background:var(--blue);color:#fff;border:0;border-radius:9px;padding:12px 26px;font-size:14.5px;font-weight:600;cursor:pointer;width:100%}
.btn:hover{background:#1d4889}
.btn:disabled{opacity:.45;cursor:wait}
.spin{width:15px;height:15px;border:2px solid rgba(255,255,255,.35);border-top-color:#fff;border-radius:50%;animation:sp .7s linear infinite;display:inline-block}
@keyframes sp{to{transform:rotate(360deg)}}

#progress{display:none;margin-top:16px}
.plabel{font-size:13px;color:var(--muted);margin-bottom:6px}
.ptrack{height:5px;background:var(--tint);border-radius:3px;overflow:hidden}
.pfill{height:100%;background:var(--blue);width:0;border-radius:3px;transition:width .5s}
#errbox{display:none;margin-top:14px;background:var(--neg-soft);color:var(--neg);border-radius:9px;padding:11px 14px;font-size:13.5px}

/* ── Video banner ── */
.vbanner{display:none;margin-top:26px;background:var(--surface);border-radius:14px;padding:18px 22px;box-shadow:0 1px 3px rgba(20,30,50,.06)}
.vbanner .vt{font-weight:650;font-size:15.5px}
.vbanner .vm{font-size:13px;color:var(--muted);margin-top:2px}

/* ── Stats ── */
.stats{display:grid;grid-template-columns:repeat(4,1fr);gap:12px;margin-top:14px}
.stat{background:var(--surface);border-radius:12px;padding:16px;text-align:center;box-shadow:0 1px 3px rgba(20,30,50,.06)}
.stat .v{font-size:clamp(22px,3.6vw,30px);font-weight:750;letter-spacing:-.02em}
.stat .l{font-size:11.5px;color:var(--muted);margin-top:2px}

/* ── Timeline tahapan ── */
#hasil{display:none;padding-bottom:60px}
.timeline{margin-top:40px;position:relative}
.step{position:relative;padding:0 0 36px 56px}
.step::before{content:'';position:absolute;left:17px;top:38px;bottom:0;width:2px;background:var(--line)}
.step:last-child::before{display:none}
.stepnum{position:absolute;left:0;top:0;width:36px;height:36px;border-radius:50%;background:var(--blue);color:#fff;font-weight:700;font-size:14.5px;display:flex;align-items:center;justify-content:center}
.stephead{display:flex;align-items:baseline;gap:12px;flex-wrap:wrap;margin-bottom:4px;padding-top:5px}
.stephead h2{font-size:18.5px;font-weight:700;letter-spacing:-.01em}
.stepsub{font-size:13px;color:var(--muted);margin-bottom:14px}
.btn-info{background:none;border:0;color:var(--blue);font-size:13px;font-weight:600;cursor:pointer;padding:0;text-decoration:underline;text-underline-offset:3px}
.infobox{display:none;background:var(--blue-soft);border-radius:11px;padding:16px 19px;font-size:13.5px;margin-bottom:16px;color:#34415a}
.infobox h4{font-size:13.5px;color:var(--blue);margin-bottom:6px}
.infobox ul{padding-left:19px;margin:6px 0}
.infobox li{margin-bottom:3px}
.infobox code,.formula{font-family:var(--mono);font-size:12.5px;background:rgba(36,86,166,.1);padding:1px 6px;border-radius:4px}
.formula-block{font-family:var(--mono);font-size:13px;background:#fff;border-radius:8px;padding:10px 14px;margin:8px 0;overflow-x:auto;white-space:nowrap}

/* ── Kartu konten ── */
.card{background:var(--surface);border-radius:12px;padding:17px 19px;box-shadow:0 1px 3px rgba(20,30,50,.06)}
.card+.card{margin-top:11px}
.chead{display:flex;justify-content:space-between;align-items:center;gap:10px;flex-wrap:wrap;margin-bottom:10px}
.cauthor{font-size:12.5px;font-weight:650;color:var(--blue)}
.ctext{font-size:14px}
.cmeta{font-size:12px;color:var(--muted);margin-top:6px}
.lbl-sm{font-size:11px;color:var(--muted);font-weight:600;letter-spacing:.06em;text-transform:uppercase;margin-bottom:5px}
.monobox{font-family:var(--mono);font-size:13px;background:var(--tint);border-radius:8px;padding:9px 12px;overflow-wrap:break-word}

.badge{display:inline-block;font-size:11.5px;font-weight:650;padding:3px 10px;border-radius:99px}
.b-pos{background:var(--pos-soft);color:var(--pos)}
.b-neg{background:var(--neg-soft);color:var(--neg)}
.b-neu{background:var(--neu-soft);color:var(--neu)}

.tokens{display:flex;flex-wrap:wrap;gap:5px}
.tok{font-family:var(--mono);font-size:12.5px;background:var(--tint);border-radius:5px;padding:2px 8px}
.tok.cut{background:var(--neg-soft);color:var(--neg);text-decoration:line-through}
.tok.stem{background:var(--pos-soft);color:var(--pos)}
.tok.hit-pos{background:var(--pos-soft);color:var(--pos);font-weight:650}
.tok.hit-neg{background:var(--neg-soft);color:var(--neg);font-weight:650}

/* ── Bar distribusi ── */
.distrow{display:flex;align-items:center;gap:12px;margin-bottom:11px}
.distlbl{width:62px;font-size:13px;font-weight:650;flex-shrink:0}
.disttrack{flex:1;height:11px;background:var(--tint);border-radius:6px;overflow:hidden}
.distfill{height:100%;border-radius:6px;transition:width .9s cubic-bezier(.3,0,.2,1)}
.distval{width:88px;text-align:right;font-size:12.5px;color:var(--muted);flex-shrink:0;font-variant-numeric:tabular-nums}

/* ── Tabel ── */
.tblwrap{overflow-x:auto;-webkit-overflow-scrolling:touch}
table{width:100%;border-collapse:collapse;font-size:13.5px}
th{text-align:left;font-size:11px;font-weight:650;letter-spacing:.07em;text-transform:uppercase;color:var(--muted);padding:8px 12px;border-bottom:1px solid var(--line)}
td{padding:8px 12px;border-bottom:1px solid #f0f1f3;font-variant-numeric:tabular-nums}
tr:last-child td{border-bottom:none}
.minibar{height:6px;background:var(--tint);border-radius:3px;min-width:80px}
.minifill{height:100%;background:var(--blue);border-radius:3px}

/* ── Confusion matrix ── */
.cmtable{border-collapse:separate;border-spacing:4px;margin:0 auto;font-size:14px}
.cmtable th{border:0;font-size:11.5px;text-transform:none;letter-spacing:0;text-align:center;padding:5px 10px}
.cmtable td{border:0;border-radius:8px;text-align:center;font-weight:700;font-size:17px;min-width:62px;padding:14px 18px}
.cm-d{background:var(--pos-soft);color:var(--pos)}
.cm-o{background:#f3f4f6;color:var(--muted)}
.cm-o.nonzero{background:var(--neg-soft);color:var(--neg)}

/* ── Metrik ── */
.metrics{display:grid;grid-template-columns:repeat(4,1fr);gap:11px;margin-bottom:18px}
.metric{background:var(--surface);border-radius:12px;padding:15px;text-align:center;box-shadow:0 1px 3px rgba(20,30,50,.06)}
.metric .mv{font-size:25px;font-weight:750;letter-spacing:-.02em;color:var(--blue)}
.metric .ml{font-size:11.5px;color:var(--muted);margin-top:1px}
.metric .mf{font-family:var(--mono);font-size:10px;color:#aeb4bc;margin-top:4px}

.kwgrid{display:grid;grid-template-columns:repeat(3,1fr);gap:12px}
.kwcard{background:var(--surface);border-radius:12px;padding:15px;box-shadow:0 1px 3px rgba(20,30,50,.06)}
.kwcard h4{font-size:12px;letter-spacing:.07em;text-transform:uppercase;margin-bottom:10px}
.kwrow{display:flex;align-items:center;gap:8px;margin-bottom:6px;font-size:13px}
.kwrow span{font-family:var(--mono);min-width:78px}
.kwbar{flex:1;height:5px;background:var(--tint);border-radius:3px}
.kwfill{height:100%;border-radius:3px}

.topc{display:flex;gap:14px;align-items:flex-start}
.likebox{background:var(--blue-soft);border-radius:9px;padding:7px 11px;text-align:center;min-width:54px;flex-shrink:0}
.likebox .lk{font-size:15.5px;font-weight:750;color:var(--blue)}
.likebox .lkl{font-size:9.5px;color:var(--muted);text-transform:uppercase;letter-spacing:.05em}

footer{border-top:1px solid var(--line);padding:26px 0 40px;color:var(--muted);font-size:12.5px;text-align:center}

/* ── Responsif: tablet ── */
@media(max-width:820px){
  .stats{grid-template-columns:repeat(2,1fr)}
  .kwgrid{grid-template-columns:1fr}
  .metrics{grid-template-columns:repeat(2,1fr)}
}
/* ── Responsif: HP ── */
@media(max-width:560px){
  header{padding-top:30px}
  .form-grid{grid-template-columns:1fr}
  .panel{padding:18px 16px}
  .step{padding-left:44px;padding-bottom:30px}
  .stepnum{width:30px;height:30px;font-size:13px}
  .step::before{left:14px;top:33px}
  .stephead h2{font-size:16.5px}
  .cmtable td{min-width:48px;padding:10px 10px;font-size:14.5px}
  .topc{flex-direction:column;gap:8px}
  .distval{width:70px}
}

/* ── Navigasi ── */
.nav{display:flex;gap:6px;margin:14px 0 0;flex-wrap:wrap}
.nav a{display:inline-block;padding:7px 16px;border-radius:99px;font-size:13.5px;font-weight:600;color:var(--muted);text-decoration:none;background:var(--tint)}
.nav a.active{background:var(--blue);color:#fff}
.nav a:hover:not(.active){background:#e3e7ee;color:var(--ink)}

/* ── Forum ── */
.topic-card{background:var(--surface);border-radius:14px;padding:20px 22px;box-shadow:0 1px 3px rgba(20,30,50,.06);margin-bottom:16px}
.topic-head{display:flex;justify-content:space-between;align-items:flex-start;gap:12px;flex-wrap:wrap}
.topic-title{font-size:17px;font-weight:700;letter-spacing:-.01em}
.topic-desc{font-size:13.5px;color:var(--muted);margin-top:3px;max-width:560px}
.topic-meta{display:flex;gap:8px;align-items:center;flex-shrink:0}
.pill{font-size:11px;font-weight:650;padding:3px 10px;border-radius:99px;background:var(--tint);color:var(--muted)}
.pill.lang{background:var(--blue-soft);color:var(--blue)}
.opn-form{display:grid;grid-template-columns:160px 1fr auto;gap:9px;margin-top:14px}
.opn-form input,.opn-form textarea{background:var(--bg);border:1px solid var(--line);border-radius:8px;padding:9px 12px;font-size:14px;color:var(--ink);outline:none;font-family:inherit}
.opn-form textarea{resize:vertical;min-height:40px}
.opn-form input:focus,.opn-form textarea:focus{border-color:var(--blue);background:#fff}
.btn-sm{background:var(--blue);color:#fff;border:0;border-radius:8px;padding:9px 18px;font-size:13.5px;font-weight:600;cursor:pointer;white-space:nowrap}
.btn-sm:hover{background:#1d4889}
.btn-sm:disabled{opacity:.45;cursor:wait}
.btn-ghost{background:var(--tint);color:var(--ink)}
.btn-ghost:hover{background:#e3e7ee}
.btn-danger{background:var(--neg-soft);color:var(--neg)}
.btn-danger:hover{background:#f0d9d4}
.opn-list{margin-top:14px;display:none}
.opn-item{display:flex;gap:10px;align-items:baseline;padding:8px 0;border-top:1px solid #f0f1f3;font-size:13.5px}
.opn-item .nm{font-weight:650;color:var(--blue);flex-shrink:0;font-size:12.5px}
.topic-actions{display:flex;gap:8px;margin-top:14px;flex-wrap:wrap;align-items:center}
.opn-count{font-size:12.5px;color:var(--muted)}
.flash{font-size:12.5px;margin-top:8px;display:none}
.flash.ok{color:var(--pos)} .flash.bad{color:var(--neg)}

/* ── Admin ── */
.admin-row{display:flex;justify-content:space-between;align-items:center;gap:10px;padding:11px 0;border-top:1px solid #f0f1f3;flex-wrap:wrap}
.admin-row:first-child{border-top:0}
.form-3{display:grid;grid-template-columns:1fr 1fr 130px;gap:12px;margin-bottom:12px}

@media(max-width:680px){
  .opn-form{grid-template-columns:1fr}
  .form-3{grid-template-columns:1fr}
  .topic-head{flex-direction:column}
}