/* ============================================================
   NEXO STUDIO — shared utility-tool stylesheet
   Engineering-blueprint identity: dot grid, mono labels,
   corner-bracketed panels. Light/dark via [data-theme].
   ============================================================ */
:root{
  /* light is the default — graph-paper engineering look */
  --bg:#ffffff; --panel:#f7f9fb; --panel-2:#eef1f5; --border:#e3e7ec; --border-strong:#cfd6dd;
  --text:#1a2027; --muted:#57606a; --faint:#8c959f;
  --accent:#0969da; --accent-soft:rgba(9,105,218,0.08); --accent-line:rgba(9,105,218,0.35);
  --ok:#1a7f37; --warn:#9a6700; --err:#cf222e;
  --mark:rgba(9,105,218,0.15); --shadow:0 24px 64px rgba(31,35,40,0.16);
  --dot:rgba(9,105,218,0.10);           /* blue-tinted grid: graph paper */
  --lift:0 3px 14px rgba(23,32,41,0.08);
  --radius:8px; --header-h:60px;
  --mono:"JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, monospace;
  --sans:"Inter", system-ui, -apple-system, "Segoe UI", sans-serif;
  color-scheme: light;
}
[data-theme="dark"]{
  --bg:#0e1013; --panel:#15181c; --panel-2:#1b1f24; --border:#262b31; --border-strong:#333a42;
  --text:#e8ecf1; --muted:#9ba6b2; --faint:#6e7883;
  --accent:#4da3ff; --accent-soft:rgba(77,163,255,0.12); --accent-line:rgba(77,163,255,0.35);
  --ok:#3fb96a; --warn:#e5a445; --err:#e5615c;
  --mark:rgba(77,163,255,0.25); --shadow:0 24px 64px rgba(0,0,0,0.5);
  --dot:rgba(255,255,255,0.045);
  --lift:0 3px 14px rgba(0,0,0,0.35);
  color-scheme: dark;
}
/* brief cross-fade when the theme switches */
html.theme-anim, html.theme-anim *{ transition:background-color .25s ease, border-color .25s ease, color .25s ease !important; }
a:focus-visible, button:focus-visible{ outline:2px solid var(--accent-line); outline-offset:2px; }
*{box-sizing:border-box;margin:0;padding:0}
body{
  font-family:var(--sans); background:var(--bg); color:var(--text); line-height:1.6;
  -webkit-font-smoothing:antialiased; display:flex; flex-direction:column; min-height:100vh;
  background-image:radial-gradient(var(--dot) 1px, transparent 1px);
  background-size:26px 26px;
}
::selection{ background:var(--mark); }
button{ font-family:var(--sans); }

/* ---------- Header ---------- */
.site-header{ position:sticky; top:0; z-index:200; height:var(--header-h); background:color-mix(in srgb, var(--bg) 88%, transparent); backdrop-filter:blur(10px); border-bottom:1px solid var(--border); }
.site-header .inner{ max-width:1180px; height:100%; margin:0 auto; padding:0 20px; display:flex; align-items:center; gap:14px; }
.brand{ display:flex; align-items:center; gap:10px; text-decoration:none; color:var(--text); font-weight:600; font-size:15px; white-space:nowrap; }
.brand img{ width:26px; height:26px; object-fit:contain; }
.nav{ display:flex; align-items:center; gap:2px; margin-left:10px; }
.nav a{ color:var(--muted); text-decoration:none; font-size:14px; font-weight:500; padding:7px 11px; border-radius:6px; }
.nav a:hover{ color:var(--text); background:var(--panel-2); }
.nav a.current{ color:var(--text); }
.header-actions{ margin-left:auto; display:flex; align-items:center; gap:8px; white-space:nowrap; }
.btn{ display:inline-flex; align-items:center; justify-content:center; gap:8px; font-size:13.5px; font-weight:500; text-decoration:none; padding:8px 13px; border-radius:6px; border:1px solid transparent; cursor:pointer; transition:background .15s, border-color .15s, color .15s, filter .15s; }
.btn-ghost{ color:var(--muted); border-color:var(--border); background:transparent; }
.btn-ghost:hover{ color:var(--text); border-color:var(--border-strong); }
.btn-primary{ color:#fff; background:var(--accent); font-weight:600; border:none; }
.btn-primary:hover{ filter:brightness(1.1); }
.btn-primary:disabled{ opacity:.45; cursor:not-allowed; filter:none; }
.btn-lg{ padding:11px 20px; font-size:14.5px; }
.icon-btn{ display:inline-flex; align-items:center; justify-content:center; width:36px; height:36px; border-radius:6px; background:transparent; border:1px solid var(--border); color:var(--muted); cursor:pointer; }
.icon-btn:hover{ color:var(--text); border-color:var(--border-strong); }
.theme-btn .moon{ display:none; } .theme-btn .sun{ display:block; }
[data-theme="dark"] .theme-btn .moon{ display:block; } [data-theme="dark"] .theme-btn .sun{ display:none; }
.btn:active, .icon-btn:active{ transform:translateY(1px); }

/* ---------- Page scaffold ---------- */
main{ flex:1; max-width:1180px; width:100%; margin:0 auto; padding:0 24px 72px; }
.tool-head{ padding:44px 0 8px; max-width:760px; }
.mono-label{ font-family:var(--mono); font-size:12px; letter-spacing:.08em; text-transform:uppercase; color:var(--accent); display:flex; align-items:center; gap:10px; margin-bottom:14px; }
.mono-label::after{ content:''; flex:0 0 34px; height:1px; background:var(--accent-line); }
.tool-head h1{ font-size:32px; font-weight:800; letter-spacing:-.02em; margin-bottom:10px; }
.tool-head p{ color:var(--muted); font-size:15.5px; }
.tool-head .java-chip{ display:inline-block; font-family:var(--mono); font-size:11px; color:var(--muted); border:1px solid var(--border-strong); border-radius:5px; padding:2px 8px; margin-left:8px; vertical-align:2px; }

/* ---------- Workbench (two-column tool layout) ---------- */
.bench{ display:grid; grid-template-columns:minmax(0,7fr) minmax(0,5fr); gap:18px; margin-top:26px; align-items:start; }
.panel{ position:relative; background:var(--panel); border:1px solid var(--border); border-radius:var(--radius); padding:22px; }
/* signature corner brackets */
.panel::before,.panel::after{ content:''; position:absolute; width:14px; height:14px; border-color:var(--border-strong); border-style:solid; transition:border-color .2s; pointer-events:none; }
.panel::before{ top:-1px; left:-1px; border-width:2px 0 0 2px; border-top-left-radius:var(--radius); }
.panel::after{ bottom:-1px; right:-1px; border-width:0 2px 2px 0; border-bottom-right-radius:var(--radius); }
.panel:hover::before,.panel:hover::after{ border-color:var(--accent); }
a.panel:hover{ box-shadow:var(--lift); }
.panel h2{ font-family:var(--mono); font-size:12px; font-weight:500; letter-spacing:.08em; text-transform:uppercase; color:var(--faint); margin-bottom:18px; }

/* ---------- Forms ---------- */
.field{ margin-bottom:16px; }
.field label{ display:block; font-size:13px; font-weight:600; color:var(--muted); margin-bottom:6px; }
.field .hint{ font-size:12px; color:var(--faint); margin-top:5px; line-height:1.5; }
input[type=text], input[type=number], select, textarea{
  width:100%; padding:9px 12px; font-family:var(--sans); font-size:14px; color:var(--text);
  background:var(--bg); border:1px solid var(--border-strong); border-radius:6px; outline:none;
  transition:border-color .15s;
}
input:focus, select:focus, textarea:focus{ border-color:var(--accent); }
input.mono, textarea.mono{ font-family:var(--mono); font-size:13px; }
.row{ display:grid; grid-template-columns:1fr 1fr; gap:12px; }
.row-3{ display:grid; grid-template-columns:1fr 1fr 1fr; gap:12px; }

/* ---------- Drop zone ---------- */
.drop{ border:1.5px dashed var(--border-strong); border-radius:var(--radius); padding:30px 20px; text-align:center; color:var(--faint); font-size:14px; cursor:pointer; transition:border-color .15s, background .15s; }
.drop:hover, .drop.over{ border-color:var(--accent); background:var(--accent-soft); color:var(--muted); }
.drop strong{ color:var(--accent); font-weight:600; }
.drop .sub{ display:block; font-family:var(--mono); font-size:11.5px; margin-top:6px; }

/* ---------- Item rows ---------- */
.items{ display:flex; flex-direction:column; gap:10px; margin-top:16px; }
.item{ display:grid; grid-template-columns:44px minmax(0,1fr) auto; gap:12px; align-items:center; background:var(--bg); border:1px solid var(--border); border-radius:var(--radius); padding:10px 12px; }
.item img{ width:44px; height:44px; image-rendering:pixelated; border-radius:5px; border:1px solid var(--border); background:
  repeating-conic-gradient(var(--panel-2) 0% 25%, transparent 0% 50%) 50%/12px 12px; }
.item .meta{ min-width:0; }
.item .meta .name-in{ margin-bottom:6px; }
.item .dims{ font-family:var(--mono); font-size:11px; color:var(--faint); }
.item .rm{ background:none; border:1px solid var(--border); color:var(--faint); width:30px; height:30px; border-radius:6px; cursor:pointer; font-size:14px; line-height:1; }
.item .rm:hover{ color:var(--err); border-color:var(--err); }
.item .cfg{ display:grid; grid-template-columns:1fr 92px; gap:8px; }
.item.bad{ border-color:var(--err); }
.item .err-note{ grid-column:1/-1; color:var(--err); font-size:12px; }

/* ---------- Output ---------- */
.out-tree{ font-family:var(--mono); font-size:12.5px; line-height:1.75; color:var(--muted); background:var(--bg); border:1px solid var(--border); border-radius:var(--radius); padding:14px 16px; overflow-x:auto; white-space:pre; }
.out-tree .d{ color:var(--faint); }
.out-tree .f{ color:var(--text); }
.out-tree .hl{ color:var(--accent); }
.codebox{ position:relative; margin-top:14px; }
.codebox pre{ font-family:var(--mono); font-size:12.5px; line-height:1.65; color:var(--text); background:var(--bg); border:1px solid var(--border); border-radius:var(--radius); padding:14px 16px; overflow-x:auto; }
.codebox .copy{ position:absolute; top:8px; right:8px; font-size:12px; font-weight:500; color:var(--muted); background:var(--panel-2); border:1px solid var(--border); padding:4px 10px; border-radius:5px; cursor:pointer; }
.codebox .copy:hover{ color:var(--text); border-color:var(--border-strong); }
.codebox .copy.done{ color:var(--ok); border-color:var(--ok); }
.note{ margin-top:14px; padding:12px 15px; border-radius:var(--radius); background:var(--panel-2); border-left:3px solid var(--accent); font-size:13.5px; color:var(--muted); }
.note.warn{ border-left-color:var(--warn); }
.gen-row{ margin-top:18px; display:flex; gap:10px; align-items:center; flex-wrap:wrap; }
.gen-msg{ font-family:var(--mono); font-size:12px; color:var(--faint); }
.gen-msg.ok{ color:var(--ok); }
.gen-msg.err{ color:var(--err); }

/* ---------- Footer ---------- */
footer{ border-top:1px solid var(--border); margin-top:auto; background:var(--bg); }
footer .inner{ max-width:1180px; margin:0 auto; padding:26px 24px; display:flex; flex-wrap:wrap; gap:12px 24px; align-items:center; justify-content:space-between; color:var(--faint); font-size:13px; }
footer a{ color:var(--muted); text-decoration:none; }
footer a:hover{ color:var(--text); }
footer .links{ display:flex; gap:20px; }

@media(max-width:960px){
  .bench{ grid-template-columns:1fr; }
}
@media(max-width:860px){
  .desktop-only{ display:none; }
  .nav{ display:none; }
  .tool-head h1{ font-size:26px; }
  .row,.row-3{ grid-template-columns:1fr; }
}