:root{
  --accent:#0f6cbd; --accent-hi:#115ea3; --accent-fg:#fff;
  --bg:#eef2f7; --mica1:#e8eef8; --mica2:#f3eef6;
  --surface:rgba(255,255,255,.72); --surface-solid:#fff; --surface-2:rgba(255,255,255,.5);
  --stroke:rgba(0,0,0,.08); --stroke-2:rgba(0,0,0,.14);
  --text:#1b1b1f; --text-2:#5b5f69; --danger:#c42b1c; --ok:#0e7a0d; --warn:#9d5d00;
  --shadow:0 2px 6px rgba(0,0,0,.05),0 8px 24px rgba(0,0,0,.06);
  --shadow-hi:0 8px 32px rgba(0,0,0,.18);
  --sheet-bg:#d9dee6; --radius:8px;
  color-scheme:light;
}
@media (prefers-color-scheme:dark){
  :root:not([data-theme="light"]){
    --accent:#4cc2ff; --accent-hi:#62cbff; --accent-fg:#002438;
    --bg:#1c1c20; --mica1:#202530; --mica2:#272030;
    --surface:rgba(44,44,50,.72); --surface-solid:#2b2b30; --surface-2:rgba(255,255,255,.04);
    --stroke:rgba(255,255,255,.08); --stroke-2:rgba(255,255,255,.16);
    --text:#f3f3f5; --text-2:#a9adb8; --danger:#ff99a4; --ok:#6ccb5f; --warn:#fce100;
    --shadow:0 2px 6px rgba(0,0,0,.25),0 8px 24px rgba(0,0,0,.3);
    --sheet-bg:#15161a; color-scheme:dark;
  }
}
:root[data-theme="dark"]{
  --accent:#4cc2ff; --accent-hi:#62cbff; --accent-fg:#002438;
  --bg:#1c1c20; --mica1:#202530; --mica2:#272030;
  --surface:rgba(44,44,50,.72); --surface-solid:#2b2b30; --surface-2:rgba(255,255,255,.04);
  --stroke:rgba(255,255,255,.08); --stroke-2:rgba(255,255,255,.16);
  --text:#f3f3f5; --text-2:#a9adb8; --danger:#ff99a4; --ok:#6ccb5f; --warn:#fce100;
  --shadow:0 2px 6px rgba(0,0,0,.25),0 8px 24px rgba(0,0,0,.3);
  --sheet-bg:#15161a; color-scheme:dark;
}
*{box-sizing:border-box}
[hidden]{display:none!important}
html,body{height:100%;margin:0}
body{
  font:14px/1.45 "Segoe UI Variable Text","Segoe UI Variable","Segoe UI",system-ui,sans-serif;
  color:var(--text);
  background:var(--bg) radial-gradient(1200px 700px at 0% 0%,var(--mica1),transparent 60%),
             radial-gradient(900px 600px at 100% 100%,var(--mica2),transparent 60%);
  background-attachment:fixed;
}
svg{width:18px;height:18px;fill:none;stroke:currentColor;stroke-width:1.6;stroke-linecap:round;stroke-linejoin:round;flex:none}
h1{font:600 26px/1.2 "Segoe UI Variable Display","Segoe UI",system-ui,sans-serif;margin:0}
h2{font-size:14px;font-weight:600;margin:18px 0 8px}
h3{font-size:13px;font-weight:600;margin:16px 0 6px;color:var(--text-2)}
a{color:var(--accent)}
.app{display:flex;min-height:100vh}

/* NavigationView */
.nav{width:232px;flex:none;padding:12px 8px;display:flex;flex-direction:column;gap:2px;position:sticky;top:0;height:100vh}
.brand{display:flex;align-items:center;gap:10px;font-weight:600;font-size:15px;padding:8px 12px 16px}
.brand svg{width:28px;height:28px;stroke:none}
.nav-item{display:flex;align-items:center;gap:12px;width:100%;border:0;background:transparent;color:var(--text);
  font:inherit;padding:9px 12px;border-radius:6px;cursor:pointer;text-align:left;position:relative;text-decoration:none}
.nav-item:hover{background:var(--surface-2)}
.nav-item.active{background:var(--surface)}
.nav-item.active::before{content:"";position:absolute;left:0;top:10px;bottom:10px;width:3px;border-radius:3px;background:var(--accent)}
.nav-foot{margin-top:auto;display:flex;flex-direction:column;gap:6px}
.credit{font-size:12px;color:var(--text-2);padding:8px 12px;text-decoration:none}
.credit:hover{color:var(--accent)}

.main{flex:1;min-width:0;padding:16px 20px 24px}
.view{display:none;animation:in .28s cubic-bezier(.1,.9,.2,1)}
.view.active{display:block}
@keyframes in{from{opacity:0;transform:translateY(8px)}to{opacity:1;transform:none}}
.topbar{display:flex;align-items:flex-end;justify-content:space-between;gap:16px;flex-wrap:wrap;margin-bottom:14px}
.sub{margin:4px 0 0;color:var(--text-2)}
.actions{display:flex;gap:8px;flex-wrap:wrap;align-items:center}
.spacer{flex:1}

.card{background:var(--surface);backdrop-filter:blur(30px) saturate(1.4);-webkit-backdrop-filter:blur(30px) saturate(1.4);
  border:1px solid var(--stroke);border-radius:var(--radius);box-shadow:var(--shadow);padding:14px 16px}

.btn{display:inline-flex;align-items:center;gap:8px;font:inherit;color:var(--text);background:var(--surface-solid);
  border:1px solid var(--stroke-2);border-bottom-color:rgba(0,0,0,.2);border-radius:6px;padding:7px 14px;cursor:pointer;min-height:34px;
  transition:background .12s,transform .08s}
.btn:hover{background:var(--surface-2)}
.btn:active{transform:scale(.98)}
.btn:disabled{opacity:.45;cursor:default;transform:none}
.btn.accent{background:var(--accent);color:var(--accent-fg);border-color:transparent;font-weight:600}
.btn.accent:hover{background:var(--accent-hi)}
.btn.sub-btn{padding:4px 10px;min-height:28px;font-size:13px}
.btn.danger{color:var(--danger)}
:focus-visible{outline:2px solid var(--accent);outline-offset:2px}

/* Workspace */
.workspace{display:grid;grid-template-columns:290px minmax(0,1fr) 300px;gap:14px;align-items:start}
.settings{max-height:calc(100vh - 110px);overflow:auto;position:sticky;top:16px}
.settings h2:first-child{margin-top:0}
label{display:flex;flex-direction:column;gap:4px;font-size:13px;color:var(--text-2);margin-bottom:10px}
input[type=number],input:not([type]),input[type=email],input[type=password],select,textarea{
  font:inherit;color:var(--text);background:var(--surface-solid);border:1px solid var(--stroke-2);
  border-bottom:1px solid var(--text-2);border-radius:5px;padding:6px 9px;min-height:32px;width:100%}
input:focus,select:focus,textarea:focus{outline:none;border-bottom:2px solid var(--accent)}
label.check{flex-direction:row;align-items:center;gap:8px;color:var(--text);cursor:pointer}
label.check.inline{align-self:end;margin-bottom:16px}
input[type=checkbox]{width:18px;height:18px;accent-color:var(--accent);margin:0}
input[type=range]{accent-color:var(--accent);width:100%}
output{color:var(--text);font-weight:600}
.row2{display:grid;grid-template-columns:1fr 1fr;gap:10px}
.hint{font-size:12px;color:var(--text-2);margin:0 0 10px}
.seg{display:flex;background:var(--surface-2);border:1px solid var(--stroke);border-radius:6px;padding:2px;margin-bottom:10px;gap:2px}
.seg.col{flex-direction:column}
.seg button{flex:1;border:0;background:transparent;color:var(--text);font:inherit;font-size:13px;padding:6px 8px;border-radius:4px;cursor:pointer}
.seg button.active{background:var(--surface-solid);box-shadow:0 1px 3px rgba(0,0,0,.12);font-weight:600}

/* Preview */
.preview{padding:0;overflow:hidden;display:flex;flex-direction:column;min-height:560px}
.preview-bar{display:flex;align-items:center;gap:8px;padding:8px 12px;border-bottom:1px solid var(--stroke)}
.stat{font-size:12px;color:var(--text-2)}
.canvas-wrap{position:relative;flex:1;background:var(--sheet-bg);display:grid;place-items:center;padding:16px;min-height:520px}
.canvas-wrap.drag{outline:2px dashed var(--accent);outline-offset:-10px}
#cv{max-width:100%;box-shadow:var(--shadow-hi);background:#fff}
.empty{position:absolute;inset:0;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:6px;color:var(--text-2);text-align:center;padding:20px}
.empty svg{width:48px;height:48px;stroke-width:1.2;color:var(--accent)}
.empty strong{color:var(--text);font-size:16px}

/* Files */
.files{max-height:calc(100vh - 110px);overflow:auto;position:sticky;top:16px}
.files-head{display:flex;align-items:center;justify-content:space-between;gap:8px;flex-wrap:wrap}
.files-head h2{margin:0}
.pill{display:inline-block;min-width:22px;text-align:center;font-size:12px;padding:1px 7px;border-radius:10px;background:var(--accent);color:var(--accent-fg)}
#listaFile{list-style:none;margin:10px 0 0;padding:0;display:flex;flex-direction:column;gap:6px}
#listaFile li{display:grid;grid-template-columns:52px 1fr auto;gap:10px;align-items:center;padding:6px;border-radius:6px;border:1px solid var(--stroke);background:var(--surface-2);animation:in .25s}
#listaFile li.err{border-color:var(--danger)}
.thumb{width:52px;height:52px;border-radius:4px;object-fit:contain;background:repeating-conic-gradient(#ccc 0 25%,#fff 0 50%) 0 0/10px 10px}
.fname{font-size:13px;font-weight:600;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.fmeta{font-size:11px;color:var(--text-2)}
.fmeta.err{color:var(--danger)}
.fctl{display:flex;flex-direction:column;gap:4px;align-items:flex-end}
.fctl input{width:58px;min-height:26px;padding:2px 6px;font-size:12px}
.icon-btn{border:0;background:transparent;color:var(--text-2);cursor:pointer;padding:3px;border-radius:4px;display:inline-flex}
.icon-btn:hover{background:var(--surface-solid);color:var(--text)}
.icon-btn svg{width:16px;height:16px}
.icon-btn.mini{padding:2px}
.icon-btn.mini svg{width:14px;height:14px}
.icon-btn.on{color:var(--accent)}
.fmis{grid-column:1/-1;display:flex;align-items:center;gap:4px;font-size:12px;color:var(--text-2);min-width:0}
.fmis::before{content:"Stampa";margin-right:2px}
.fmis input{width:58px;min-width:0;flex:0 1 58px;min-height:26px;padding:2px 6px;font-size:12px}
.tag{font-size:10px;padding:0 5px;border-radius:3px;background:var(--ok);color:#fff;margin-left:4px;vertical-align:1px}

/* Funzioni */
.grid-funz{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:12px}
.grid-funz .card h2{margin:6px 0 4px;font-size:15px}
.grid-funz .card p{margin:0;color:var(--text-2)}
.grid-funz .card svg{width:28px;height:28px;color:var(--accent)}
.form,.storico,.info{max-width:680px;margin-bottom:14px}
#listaSegnalazioni{list-style:none;padding:0;margin:0}
#listaSegnalazioni li{padding:8px 0;border-top:1px solid var(--stroke);font-size:13px}
.stato{font-size:11px;padding:1px 6px;border-radius:3px;background:var(--surface-2);border:1px solid var(--stroke-2)}

.banner{padding:10px 14px;border-radius:var(--radius);margin-bottom:12px;background:#fff4ce;color:#5c3c00;border:1px solid #f4d06f}
.banner.demo{background:#e8f1fb;color:#0b3a66;border-color:#9cc3ea}
.banner.attiva{background:#dff6dd;color:#0e4b0d;border-color:#9fd89a}
.guida-passo{min-height:150px}
.guida-passo svg{width:40px;height:40px;color:var(--accent)}
.guida-nav{display:flex;gap:6px;justify-content:center;margin:10px 0}
.guida-nav i{width:8px;height:8px;border-radius:50%;background:var(--stroke-2)}
.guida-nav i.on{background:var(--accent)}
.banner.scaduta{background:#fde7e9;color:#6e0811;border-color:#f1b0b7}

/* Overlay e dialog */
.overlay{position:fixed;inset:0;background:rgba(0,0,0,.35);display:grid;place-items:center;z-index:50;padding:16px;animation:fade .15s}
.overlay[hidden]{display:none}
@keyframes fade{from{opacity:0}}
.dialog{background:var(--surface-solid);border:1px solid var(--stroke);border-radius:10px;box-shadow:var(--shadow-hi);padding:22px;min-width:280px;max-width:92vw;text-align:center;animation:pop .2s cubic-bezier(.1,.9,.2,1)}
.dialog.wide{text-align:left;max-width:520px}
@keyframes pop{from{transform:scale(.96);opacity:0}}
.spinner{width:32px;height:32px;margin:0 auto 10px;border-radius:50%;border:3px solid var(--stroke-2);border-top-color:var(--accent);animation:spin .8s linear infinite}
@keyframes spin{to{transform:rotate(360deg)}}
.bar{height:4px;border-radius:2px;background:var(--stroke-2);overflow:hidden;margin-top:10px}
.bar span{display:block;height:100%;width:0;background:var(--accent);transition:width .2s}

/* Editor scontorno */
.dialog.editor{width:min(1180px,96vw);height:min(820px,94vh);padding:0;text-align:left;display:flex;flex-direction:column}
.ed-head{display:flex;justify-content:space-between;align-items:center;padding:12px 16px;border-bottom:1px solid var(--stroke)}
.ed-head h2{margin:0;font-size:16px}
.ed-body{flex:1;display:grid;grid-template-columns:1fr 280px;min-height:0}
.ed-stage{position:relative;display:grid;place-items:center;background:var(--sheet-bg);padding:12px;min-height:0;overflow:hidden}
#edCanvas{max-width:100%;max-height:100%;cursor:crosshair;box-shadow:var(--shadow)}
.ed-stage.scacchi #edCanvas{background:repeating-conic-gradient(#c8c8c8 0 25%,#fff 0 50%) 0 0/16px 16px}
.ed-stage.bianco #edCanvas{background:#fff}
.ed-stage.nero #edCanvas{background:#000}
.ed-tip{position:absolute;bottom:10px;left:50%;transform:translateX(-50%);font-size:12px;background:var(--surface);backdrop-filter:blur(20px);padding:4px 10px;border-radius:12px;border:1px solid var(--stroke)}
.ed-tools{padding:12px 16px;overflow:auto;border-left:1px solid var(--stroke)}
.ed-tools h3:first-child{margin-top:0}
.ed-tools .btn.accent{width:100%;justify-content:center;margin-bottom:6px}
.ed-foot{padding:12px 16px;border-top:1px solid var(--stroke)}

/* Mobile: barra in basso */
@media (max-width:1180px){
  .workspace{grid-template-columns:280px minmax(0,1fr)}
  .files{grid-column:1/-1;position:static;max-height:none}
}
@media (max-width:760px){
  .app{flex-direction:column}
  .nav{position:fixed;bottom:0;top:auto;left:0;right:0;width:auto;height:auto;flex-direction:row;padding:4px 6px calc(4px + env(safe-area-inset-bottom));
    background:var(--surface);backdrop-filter:blur(30px);border-top:1px solid var(--stroke);z-index:40;justify-content:space-around}
  .brand,.credit{display:none}
  .nav-foot{margin:0;flex-direction:row}
  .nav-item{flex-direction:column;gap:2px;font-size:11px;padding:6px 8px;align-items:center;text-align:center}
  .nav-item.active::before{left:30%;right:30%;top:auto;bottom:0;width:auto;height:3px}
  .main{padding:12px 16px 90px}
  .workspace{grid-template-columns:1fr}
  .settings,.files{position:static;max-height:none}
  .preview{min-height:380px}.canvas-wrap{min-height:340px}
  .ed-body{grid-template-columns:1fr;grid-template-rows:1fr auto}
  .ed-tools{border-left:0;border-top:1px solid var(--stroke);max-height:40vh}
  .topbar .actions{width:100%}
  .topbar .actions .btn{flex:1;justify-content:center}
}
@media (prefers-reduced-motion:reduce){*{animation:none!important;transition:none!important}}