:root{
  --bg:#0b1020; --surface:#111832; --surface-2:#0e1630; --text:#eaf0ff; --muted:#a9b4d9; --border:#233056;
  --accent:#2a6df4; --accent-600:#225bd0; --accent-700:#1b49ac; --accent-fg:#ffffff;
  --danger:#e25b5b; --danger-600:#c94b4b; --ok:#1f7a43; --ok-600:#176135;
  --radius:14px; --radius-lg:18px; --shadow:0 8px 28px rgba(0,0,0,.35);
  --space-1:4px; --space-2:8px; --space-3:12px; --space-4:16px; --space-5:20px; --space-6:24px; --space-7:32px;
  --focus-ring: 0 0 0 3px rgba(42,109,244,.35), 0 0 0 1px var(--accent);
}
@media (prefers-reduced-motion: no-preference){
  :root{ --anim-quick: 140ms; }
}
html,body{height:100%}
body{font-family:system-ui,-apple-system,Segoe UI,Roboto,Ubuntu,Inter,Arial,sans-serif;line-height:1.5;margin:0;background:linear-gradient(180deg, var(--bg), #0a0f1f 60%);color:var(--text)}
.wrap{max-width:1200px;margin:0 auto;padding:var(--space-6)}
h1{font-size:28px;margin:0 0 var(--space-2)}
.sublead{color:var(--muted);max-width:80ch;margin-bottom:var(--space-6)}
.card{background:linear-gradient(180deg, var(--surface), var(--surface-2));border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow);padding:var(--space-5);margin:var(--space-4) 0}
.field label{display:block;margin-bottom:6px;font-weight:600}
label{font-weight:600}
label.mini {  font-size: 13px;  font-weight: 400; /* not bold */  color: var(--muted);}
a {  color: #6fa8ff;            /* softer blue that works on dark bg */  text-decoration: none;}
a:hover, a:focus {  color: #9fc5ff;            /* lighter on hover */  text-decoration: underline;}
input[type=file]{position:absolute;left:-9999px}
.btn{display:inline-flex;align-items:center;gap:8px;border:1px solid var(--border);background:#1b2547;color:var(--text);border-radius:12px;padding:10px 14px;cursor:pointer;transition:transform var(--anim-quick), box-shadow var(--anim-quick), background var(--anim-quick)}
.btn:hover{transform:translateY(-1px)}
.btn:focus-visible{outline:none;box-shadow:var(--focus-ring)}
.btn-primary{background:var(--accent);border-color:var(--accent);color:var(--accent-fg)}
.btn-primary:hover{background:var(--accent-600)}
.btn-primary:active{background:var(--accent-700)}
.btn-secondary{background:#1b2547}
.table-actions{padding-top:12px}
.table-actions .btn{white-space:nowrap}
.badge{display:inline-block;padding:2px 8px;border-radius:999px;background:#1b2547;border:1px solid var(--border);font-size:12px;color:var(--muted)}
.badge.ok{background:#133220;border-color:#205533;color:#c9f0d6}
.badge.warn{background:#3a1a1a;border-color:#6f2b2b;color:#ffd4d4;text-align: center}
.row{display:flex;gap:var(--space-4);flex-wrap:wrap}
.row>div{flex:1;min-width:260px}
.row.compact{gap:var(--space-2)}
.mt-1{margin-top:var(--space-1)} .mt-3{margin-top:var(--space-3)}
.ai-center{align-items:center}
.jc-between{justify-content:space-between}
.actions-end{align-self:flex-end; display:flex; gap:8px; flex-wrap:wrap}
select, input[type=number], input[type=range]{background:#0f162c;border:1px solid var(--border);color:var(--text);border-radius:12px;padding:10px 12px}
input[type=number]{max-width:120px}
.compact-selects select{max-width:240px}
select:focus-visible, input:focus-visible{outline:none;box-shadow:var(--focus-ring)}
.file-field{display:flex;flex-direction:column;gap:var(--space-2)}
.file-actions{display:flex;gap:8px;flex-wrap:wrap}
.note{font-size:12px;color:var(--muted)}
.table-wrap{margin-top:var(--space-3);overflow-x:auto;border:1px solid var(--border);border-radius:12px}
table{width:100%;border-collapse:separate;border-spacing:0;min-width:820px}
th, td{padding:10px 12px;border-bottom:1px solid var(--border);vertical-align:top}
thead th{position:sticky;top:0;background:#0d1428;z-index:1;text-align:left}
tbody tr:nth-child(even){background:#0e142a}
tbody tr:hover{background:#0f1835}
.scorebar{height:8px;background:#1b2547;border-radius:5px;overflow:hidden}
.scorebar>span{display:block;height:100%;background:var(--accent)}
.hl{background:#151f45;border:1px solid var(--border);border-radius:10px;padding:10px}
.err{color:#ffbcbc}
.banner{background:#231a1a;border:1px solid #6f2b2b;border-radius:10px;padding:10px;margin-top:8px}
details{border:1px solid var(--border);border-radius:12px;background:#0f162c}
details+details{margin-top:10px}
summary{cursor:pointer;list-style:none;padding:12px 14px;font-weight:600}
summary::-webkit-details-marker{display:none}
details[open] summary{border-bottom:1px solid var(--border)}
.faq-content{padding:12px 14px;color:var(--muted)}
footer{margin-top:var(--space-7);padding:var(--space-5) 0;color:var(--muted);border-top:1px solid var(--border)}
@media (max-width: 720px){
  .wrap{padding:var(--space-5)}
  input[type=range]{width:100%}
  .row>div{min-width:100%}
}

/* --- top grid layout --- */
.top-grid{display:grid;grid-template-columns:1.1fr .9fr;gap:24px;align-items:start}
.panel h3{margin:0 0 10px;font-size:16px}
.selects-row select{max-width:260px;min-width:160px}
.col-right .settings{display:flex;flex-direction:column;gap:20px}
.weights-list{display:flex;flex-direction:column;gap:12px;max-width:320px}
.actions-end.right{justify-content:flex-end}
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}

/* Align labels and inputs tighter like screenshot */
.field label{display:block;margin-bottom:6px;font-weight:600}
.weights-list .field input[type=number]{width:140px}
.selects-row{gap:12px}

/* Responsive: stack columns */
@media (max-width: 980px){
  .top-grid{grid-template-columns:1fr}
  .actions-end.right{justify-content:flex-start}
}

/* Equal panel grid */
.top-grid.equal-panels{display:grid;grid-template-columns:1fr 1fr;gap:24px;align-items:stretch}
.panel.card{height:100%;display:flex;flex-direction:column}
.panel .panel-body{display:flex;flex-direction:column;gap:16px;min-height:100%}
.grow-spacer{flex:1 1 auto}
.panel-left .upload-block + .upload-block{margin-top:8px}
.panel h3{margin:0 0 6px;font-size:18px}
.panel h4{margin:4px 0 6px;font-size:14px;color:var(--muted)}
.mt-2{margin-top:12px}
.small{font-size:12px}

@media (max-width: 980px){
  .top-grid.equal-panels{grid-template-columns:1fr}
}


/* prevent overlap between top panels and results table */
.top-grid{margin-bottom: 24px;}
.card{position: relative;}
#results.card{margin-top: 24px;}


/* hard spacer between top panels and table */
.divider-space{height:36px; width:100%; clear:both;}
.top-grid.equal-panels{margin-bottom:0;} /* spacer handles gap now */

/* Wide-left layout and equal heights */
.top-grid.wide-left{display:grid;grid-template-columns:1.4fr 0.6fr;gap:24px;align-items:stretch}
.panel.card{height:100%;display:flex;flex-direction:column}
.panel .panel-body{display:flex;flex-direction:column;gap:16px;min-height:100%}
.grow-spacer{flex:1 1 auto}

/* Upload + select side-by-side for each pair */
.upload-pair{display:grid;grid-template-columns:1fr 1fr;gap:16px;align-items:start}
.upload-unit .file-actions{display:flex;gap:8px;flex-wrap:wrap}
.selects-row select{max-width:240px;min-width:150px}
.left-actions{justify-content:flex-start}

/* Thinner settings card */
.panel-right.thin .panel-body{max-width:420px}

/* Responsive: stack pairs and columns on mobile */
@media (max-width: 980px){
  .top-grid.wide-left{grid-template-columns:1fr}
  .upload-pair{grid-template-columns:1fr}
}


/* strengthened spacer and results separation */
.divider-space{height:64px; width:100%; clear:both;}
#results.card{margin-top:24px; clear:both; z-index: 0;}
.top-grid.wide-left{z-index:1; position:relative;}


/* Fix overlap: don't force equal height with absolute stretch, let panels auto-size */
.top-grid.wide-left{align-items:start}
.panel.card{height:auto; min-height:0;}
#results.card{margin-top:32px; position:relative; z-index:0;}


/* --- overlap fix: reset stacking contexts and add explicit spacing --- */
.top-grid.wide-left{position: static; z-index: auto}
#results.card{margin-top: 32px; position: static; z-index: auto;}
.card{z-index: auto;}
.divider-space{height: 48px; clear: both;}