/* olgac.net toolkit — shared styles
   Layout: sticky blue top bar (brand / breadcrumb / tool menu), centred 1140px column,
   two-column input→output grid that stacks under 860px. Colours follow the main site. */
:root{
  --blue:#0073e6; --blue-dark:#005bb5; --blue-soft:#e8f1fd; --blue-line:#b9d4f5;
  --bg:#f6f7fb; --card:#ffffff; --text:#111418; --muted:#5b6472; --line:#e3e7ee; --head:#f0f4f9;
  --ok:#1a7f4b; --ok-bg:#e6f4ec; --warn:#b26a00; --warn-bg:#fff4e0; --bad:#c62828; --bad-bg:#fdecec;
  --radius:12px; --shadow:0 6px 18px rgba(16,24,40,.08);
  --sans:Arial,Helvetica,sans-serif;
  --mono:ui-monospace,"SF Mono",Menlo,Consolas,"Liberation Mono",monospace;
}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{margin:0;background:var(--bg);color:var(--text);font:15px/1.5 var(--sans)}
a{color:var(--blue)}
h1{font-size:24px;line-height:1.25;margin:0 0 4px}
h2{font-size:17px;margin:0 0 10px}
h3{font-size:15px;margin:0 0 8px}
p{margin:0 0 10px}
.lead{color:var(--muted);margin:0 0 18px;max-width:70ch}

/* Top bar */
.topbar{position:sticky;top:0;z-index:50;background:var(--blue);color:#fff;display:flex;align-items:center;gap:10px 14px;flex-wrap:wrap;padding:10px max(16px,env(safe-area-inset-right,0px)) 10px max(16px,env(safe-area-inset-left,0px))}
.topbar a{color:#fff;text-decoration:none}
.topbar a:hover{text-decoration:underline}
.topbar .brand{font-weight:700}
.topbar .crumb{opacity:.95;min-width:0}
.topbar .crumb strong{font-weight:600}
.topbar .spacer{flex:1}
.menu{position:relative}
.menu summary{list-style:none;cursor:pointer;padding:5px 10px;border:1px solid rgba(255,255,255,.55);border-radius:8px;user-select:none;font-size:14px}
.menu summary::-webkit-details-marker{display:none}
.menu summary::after{content:" ▾"}
.menu nav{position:absolute;right:0;top:calc(100% + 6px);background:var(--card);color:var(--text);border:1px solid var(--line);border-radius:10px;box-shadow:var(--shadow);min-width:250px;padding:6px;display:grid;z-index:60}
.menu nav a{color:var(--text);padding:7px 10px;border-radius:8px;display:block;font-size:14px}
.menu nav a:hover,.menu nav a:focus{background:var(--blue-soft);text-decoration:none}
.menu nav a.current{font-weight:700;color:var(--blue)}
.menu nav .group{font-size:11px;letter-spacing:.06em;text-transform:uppercase;color:var(--muted);padding:8px 10px 2px}

/* Page frame */
.wrap{max-width:1140px;margin:0 auto;padding-block:20px 32px;padding-left:max(16px,env(safe-area-inset-left,0px));padding-right:max(16px,env(safe-area-inset-right,0px))}
.card{background:var(--card);border-radius:var(--radius);box-shadow:var(--shadow);padding:18px;min-width:0}
.card + .card{margin-top:18px}
.cols{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1.35fr);gap:18px;align-items:start}
.cols > *{min-width:0}
@media (max-width:860px){.cols{grid-template-columns:1fr}}
.grid2{display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:18px;align-items:start}
.stack{display:grid;gap:18px}

/* Forms */
label{display:block;font-weight:600;font-size:13px;margin:12px 0 4px}
label:first-child,.field:first-child label{margin-top:0}
input[type=text],input[type=number],input[type=search],input[type=url],textarea,select{width:100%;font:inherit;padding:8px 10px;border:1px solid var(--line);border-radius:8px;background:#fff;color:var(--text);min-width:0}
input[type=number]{font-variant-numeric:tabular-nums}
textarea{font-family:var(--mono);font-size:13px;min-height:110px;resize:vertical;line-height:1.45}
input:focus,textarea:focus,select:focus{outline:2px solid var(--blue);outline-offset:1px;border-color:var(--blue)}
button:focus-visible,a:focus-visible,summary:focus-visible{outline:2px solid var(--blue);outline-offset:2px}
.row{display:flex;flex-wrap:wrap;gap:8px;align-items:center}
.row > *{min-width:0}
.row.tight{gap:6px}
.inline{display:grid;grid-template-columns:minmax(0,1fr) auto;gap:8px;align-items:end}
.inline3{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr) auto;gap:8px;align-items:end}
@media (max-width:520px){.inline3{grid-template-columns:1fr 1fr}}
.field{min-width:0}
.btn{font:inherit;font-weight:600;font-size:14px;padding:8px 14px;border-radius:8px;border:1px solid var(--blue);background:var(--blue);color:#fff;cursor:pointer;white-space:nowrap}
.btn:hover{background:var(--blue-dark);border-color:var(--blue-dark)}
.btn.secondary{background:#fff;color:var(--blue)}
.btn.secondary:hover{background:var(--blue-soft)}
.btn.small{padding:5px 10px;font-size:13px}
.btn[disabled]{opacity:.5;cursor:not-allowed}
.btn.ghost{background:transparent;border-color:var(--line);color:var(--text)}
.btn.ghost:hover{background:var(--head)}
.check{display:inline-flex;align-items:center;gap:6px;font-weight:500;font-size:14px;margin:0}
.check input{width:auto;margin:0}
.chip{display:inline-block;padding:3px 9px;border-radius:999px;font-size:12px;font-weight:600;border:1px solid var(--line);background:#fff;color:var(--muted);white-space:nowrap}
.chip.ok{color:var(--ok);background:var(--ok-bg);border-color:transparent}
.chip.warn{color:var(--warn);background:var(--warn-bg);border-color:transparent}
.chip.bad{color:var(--bad);background:var(--bad-bg);border-color:transparent}
.chips{display:flex;flex-wrap:wrap;gap:6px}
.status{font-size:13px;color:var(--muted);min-height:1.3em;margin-top:8px}
.status.error{color:var(--bad)}
.status.ok{color:var(--ok)}
.examples{display:flex;flex-wrap:wrap;gap:6px;margin-top:8px;align-items:center}
.examples span{font-size:12px;color:var(--muted)}
.examples button{font:inherit;font-size:12px;padding:3px 10px;border-radius:999px;border:1px solid var(--blue-line);background:#fff;color:var(--blue);cursor:pointer}
.examples button:hover{background:var(--blue-soft)}
.help{font-size:13px;color:var(--muted);margin-top:6px}
.help code,.mono{font-family:var(--mono);font-size:13px;overflow-wrap:anywhere}
.note{font-size:13px;color:var(--muted)}
.hr{border:0;border-top:1px solid var(--line);margin:14px 0}

/* Data */
.table-wrap{overflow-x:auto;max-width:100%;-webkit-overflow-scrolling:touch}
table.tbl{width:100%;border-collapse:collapse;font-size:14px}
.tbl th,.tbl td{padding:7px 10px;border-bottom:1px solid var(--line);text-align:left;vertical-align:top}
.tbl th{background:var(--head);font-weight:600;white-space:nowrap}
.tbl td.num,.tbl th.num{text-align:right;font-variant-numeric:tabular-nums;white-space:nowrap}
.tbl tr.clickable{cursor:pointer}
.tbl tr.clickable:hover td{background:var(--blue-soft)}
.tbl tr.selected td{background:var(--blue-soft)}
.kv{display:grid;grid-template-columns:max-content minmax(0,1fr);gap:5px 14px;font-size:14px;margin:0}
.kv dt{color:var(--muted)}
.kv dd{margin:0;font-variant-numeric:tabular-nums;min-width:0;overflow-wrap:anywhere}
.big{font-size:22px;font-weight:700;font-variant-numeric:tabular-nums}
.result{background:var(--head);border-radius:10px;padding:12px 14px}
.result + .result{margin-top:10px}
.struct{display:flex;justify-content:center;align-items:center;background:#fff;border:1px solid var(--line);border-radius:10px;min-height:120px;padding:6px}
.struct svg{max-width:100%;height:auto;display:block}
.thumb{width:150px;height:110px;border:1px solid var(--line);border-radius:8px;background:#fff;display:flex;align-items:center;justify-content:center}
.thumb svg{max-width:100%;max-height:100%}
.copybtn{font:inherit;font-size:12px;padding:2px 8px;border-radius:6px;border:1px solid var(--line);background:#fff;color:var(--muted);cursor:pointer;vertical-align:middle;margin-left:6px}
.copybtn:hover{background:var(--head);color:var(--text)}
pre.block{background:var(--head);border-radius:8px;padding:10px 12px;font:13px/1.45 var(--mono);overflow-x:auto;margin:0;white-space:pre-wrap;overflow-wrap:anywhere}
.seq{font:13px/1.6 var(--mono);white-space:pre-wrap;overflow-wrap:anywhere;letter-spacing:.5px}
.tabs{display:flex;gap:6px;flex-wrap:wrap;margin-bottom:14px;border-bottom:1px solid var(--line);padding-bottom:10px}
.tabs button{font:inherit;font-weight:600;font-size:14px;padding:6px 12px;border-radius:8px;border:1px solid transparent;background:transparent;color:var(--muted);cursor:pointer}
.tabs button[aria-selected=true]{background:var(--blue-soft);color:var(--blue);border-color:var(--blue-line)}
.tabs button:hover{color:var(--blue)}
.toast{position:fixed;left:50%;bottom:24px;transform:translateX(-50%);background:#1f2937;color:#fff;padding:10px 16px;border-radius:10px;font-size:14px;box-shadow:var(--shadow);opacity:0;transition:opacity .2s;pointer-events:none;z-index:100;max-width:90vw}
.toast.show{opacity:1}
.spinner{display:inline-block;width:14px;height:14px;border:2px solid var(--blue-line);border-top-color:var(--blue);border-radius:50%;animation:spin .8s linear infinite;vertical-align:-2px;margin-right:6px}
@keyframes spin{to{transform:rotate(360deg)}}
.dropzone{border:2px dashed var(--blue-line);border-radius:10px;padding:14px;text-align:center;color:var(--muted);font-size:13px;background:#fff}
.dropzone.over{background:var(--blue-soft);border-color:var(--blue)}
.chart svg{width:100%;height:auto;display:block}

/* Footer */
footer.foot{max-width:1140px;margin:0 auto;padding-block:6px 30px;padding-left:max(16px,env(safe-area-inset-left,0px));padding-right:max(16px,env(safe-area-inset-right,0px));color:var(--muted);font-size:13px;display:flex;flex-wrap:wrap;gap:6px 16px}
footer.foot a{color:var(--muted)}

@media (prefers-reduced-motion:reduce){*{transition:none!important;animation:none!important;scroll-behavior:auto!important}}
@media print{.topbar,.menu,.btn,.examples,footer.foot{display:none!important}.card{box-shadow:none;border:1px solid var(--line)}}