:root{--bg:#fbfbfa;--fg:#1c1c1c;--mut:#686868;--line:#e2e1dd;--card:#fff;--side:#fff;--blue:#1d4f8f;--orange:#f07a12;
  --ok:#2e7d4f;--bad:#b3261e;--hover:#f1f3f7;--r:8px;--sw:240px}
@media (prefers-color-scheme:dark){:root{--bg:#151618;--fg:#ececea;--mut:#9b9c9f;--line:#2c2e32;--card:#1d1f22;--side:#1a1c1f;
  --blue:#7fa9e0;--orange:#f59a4a;--ok:#6cc08b;--bad:#ef8a80;--hover:#24272b}}
*{box-sizing:border-box}
html,body{margin:0;overflow-x:hidden}
body{background:var(--bg);color:var(--fg);font:15px/1.5 system-ui,-apple-system,"Segoe UI",sans-serif}
a{color:var(--blue)}

/* layout: menu on the left, logo top-left always visible */
.layout{display:grid;grid-template-columns:var(--sw) minmax(0,1fr);min-height:100vh}
.side{position:sticky;top:0;height:100vh;display:flex;flex-direction:column;background:var(--side);
  border-right:1px solid var(--line);z-index:20}
.side-top{display:flex;align-items:center;justify-content:space-between;background:#fff;
  border-bottom:4px solid;border-image:linear-gradient(90deg,var(--blue) 0 70%,var(--orange) 70%) 1}
.logo{display:block;padding:14px 18px;flex:1}
.logo img{display:block;width:100%;max-width:200px;height:auto}
.burger{display:none;font-size:1.6rem;line-height:1;padding:.4rem .9rem;cursor:pointer;color:#1d4f8f;user-select:none}
.side-menu{display:flex;flex-direction:column;flex:1;min-height:0;overflow-y:auto}
.ctx{padding:.9rem 18px .4rem;font-size:.8rem;font-weight:700;letter-spacing:.04em;text-transform:uppercase;color:var(--mut)}
.side nav{display:flex;flex-direction:column}
.side nav a,.sidelink{display:block;padding:.55rem 18px;color:var(--fg);text-decoration:none;border-left:3px solid transparent}
.side nav a:hover,.sidelink:hover{background:var(--hover)}
.side nav a.on,.sidelink.on{border-left-color:var(--orange);color:var(--blue);font-weight:600;background:var(--hover)}
.side-bottom{margin-top:auto;border-top:1px solid var(--line);padding:.4rem 0 .8rem;font-size:.92rem}
.langs{display:flex;gap:.8rem;padding:.5rem 18px 0}
.langs a{text-decoration:none;color:var(--mut);font-weight:600;font-size:.85rem}
.langs a.on{color:var(--orange)}
main{padding:1.2rem 28px 3rem;max-width:72rem;width:100%}

@media (max-width:820px){
  .layout{grid-template-columns:minmax(0,1fr)}
  .side{height:auto;border-right:0;border-bottom:1px solid var(--line)}
  .logo{padding:8px 16px}.logo img{max-width:130px}
  .burger{display:block}
  .side-menu{display:none;max-height:calc(100vh - 70px)}
  #menu-toggle:checked ~ .side-menu{display:flex}
  main{padding:1rem 16px 3rem}
}

h1{font-size:1.45rem;margin:.3rem 0 1rem}h2{font-size:1.1rem;margin:1.8rem 0 .6rem}
.mut{color:var(--mut);font-size:.88rem}
.hint{font-size:.86rem;color:var(--mut);margin:.3rem 0}
input,textarea,select,button,.btn{font:inherit;padding:.45rem .6rem;border:1px solid var(--line);border-radius:6px;
  background:var(--card);color:var(--fg);max-width:100%}
textarea{width:100%;min-height:4.5rem}
button,.btn{background:var(--blue);color:#fff;border-color:var(--blue);cursor:pointer;text-decoration:none;
  display:inline-block;line-height:1.3}
button.sec,.btn.sec{background:transparent;color:var(--blue)}
button.danger{background:transparent;color:var(--bad);border-color:var(--bad)}
button.small{padding:.2rem .5rem;font-size:.85rem}
.row{display:flex;flex-wrap:wrap;gap:.5rem;align-items:center;margin:.6rem 0}
.grow{flex:1;min-width:10rem}
.card{background:var(--card);border:1px solid var(--line);border-radius:var(--r);padding:1rem;margin:.8rem 0}
.form label{display:block;margin:.7rem 0 .2rem;font-weight:600;font-size:.92rem}
.form label.inline{display:inline-flex;gap:.4rem;font-weight:400;margin:.2rem 1rem .2rem 0}
.form input:not([type=checkbox]):not([type=radio]),.form select{width:100%}
.req::after{content:" *";color:var(--orange)}
.msg{padding:.6rem .8rem;border-left:4px solid var(--orange);background:var(--card);border-radius:4px;margin:.5rem 0;
  word-break:break-word}
.linkbox{border-left:4px solid var(--blue)}
table{border-collapse:collapse;width:100%;font-size:.93rem}
th,td{text-align:left;padding:.45rem .5rem;border-bottom:1px solid var(--line);vertical-align:top}
th{font-size:.82rem;color:var(--mut);font-weight:600}
.scroll{overflow-x:auto}
.tag{display:inline-block;padding:0 .5rem;border-radius:999px;font-size:.78rem;border:1px solid var(--line);
  vertical-align:middle;font-weight:600}
.tag.ok{color:var(--ok);border-color:var(--ok)}.tag.bad{color:var(--bad);border-color:var(--bad)}
pre.out{background:var(--card);border:1px solid var(--line);border-radius:var(--r);padding:.8rem;overflow-x:auto;
  font-size:.82rem;white-space:pre-wrap;word-break:break-all}
/* project logo and settings sub-menu */
.plogo{padding:.8rem 18px 0}.plogo img{display:block;max-width:100%;max-height:56px;width:auto}
.side nav .subnav a{padding:.35rem 18px .35rem 34px;font-size:.92rem;color:var(--mut)}
.side nav .subnav a.on{color:var(--blue)}
.matrix td,.matrix th{text-align:center;white-space:nowrap}.matrix td:first-child,.matrix th:first-child{text-align:left}
.matrix select{padding:.2rem .3rem;font-size:.88rem}
.modules{display:grid;grid-template-columns:repeat(auto-fill,minmax(14rem,1fr));gap:.8rem}
.modules .card{margin:0}
/* collapsible menu groups: closed until clicked */
.side nav details.group summary{list-style:none;cursor:pointer;display:flex;justify-content:space-between;align-items:center;
  padding:.55rem 18px;border-left:3px solid transparent;user-select:none}
.side nav details.group summary::-webkit-details-marker{display:none}
.side nav details.group summary::after{content:"\25B8";font-size:.8rem;color:var(--mut)}
.side nav details.group[open] summary::after{content:"\25BE"}
.side nav details.group summary:hover{background:var(--hover)}
.side nav details.group summary.on{color:var(--blue);font-weight:600}