:root{
    --bg-0:#07090b;
    --bg-1:#0b0f13;
    --bg-2:#10161c;
    --bg-3:#151c24;
    --line:#1e2730;
    --line-strong:#2a3642;
    --text-0:#eef3f8;
    --text-1:#c8d2dc;
    --text-2:#8a97a4;
    --text-3:#5a6775;
    --accent:#22e07a;          /* primary green */
    --accent-ink:#062211;
    --accent-dim:#0f3a23;
    --accent-glow: 0 0 0 1px rgba(34,224,122,.35), 0 0 22px -6px rgba(34,224,122,.6);
    --warn:#ffb347;
    --danger:#ff5a6a;
    --blue:#5ab0ff;
    --violet:#b48bff;
    --radius:12px;
    --radius-sm:8px;
    --mono:"JetBrains Mono", ui-monospace, Menlo, monospace;
    --sans:"Geist", ui-sans-serif, system-ui, -apple-system, "Segoe UI", sans-serif;
  }

  *{box-sizing:border-box}
  html,body{margin:0;padding:0}
  body{
    font-family:var(--sans);
    color:var(--text-0);
    background:
      radial-gradient(1200px 600px at 85% -10%, rgba(34,224,122,.06), transparent 60%),
      radial-gradient(900px 500px at -10% 110%, rgba(90,176,255,.05), transparent 60%),
      var(--bg-0);
    min-height:100vh;
    -webkit-font-smoothing:antialiased;
    font-feature-settings:"ss01","cv11";
    letter-spacing:-0.005em;
  }

  /* Subtle noise */
  body::before{
    content:"";
    position:fixed;inset:0;
    pointer-events:none;
    opacity:.035;
    background-image:url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='160' height='160'><filter id='n'><feTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2' stitchTiles='stitch'/></filter><rect width='100%' height='100%' filter='url(%23n)'/></svg>");
    mix-blend-mode:overlay;
    z-index:0;
  }

  .shell{position:relative;z-index:1;max-width:1440px;margin:0 auto;padding:28px 40px 48px}

  /* -------- Top bar -------- */
  .topbar{display:flex;align-items:flex-start;justify-content:space-between;gap:24px;margin-bottom:28px}
  .brand{display:flex;align-items:center;gap:14px}
  .logo{
    width:40px;height:40px;border-radius:10px;
    background:linear-gradient(135deg,#0c1117,#161e27);
    border:1px solid var(--line-strong);
    display:grid;place-items:center;
    box-shadow: inset 0 0 0 1px rgba(255,255,255,.02);
    position:relative;
  }
  .logo svg{width:22px;height:22px}
  .title h1{font-size:20px;font-weight:600;margin:0;letter-spacing:-0.01em}
  .title p{margin:2px 0 0;color:var(--text-2);font-size:13px}

  .crumbs{display:flex;align-items:center;gap:10px;color:var(--text-2);font-size:12.5px;font-family:var(--mono)}
  .crumbs a{color:var(--text-2);text-decoration:none}
  .crumbs a:hover{color:var(--text-0)}
  .crumbs .sep{color:var(--text-3)}

  .top-actions{display:flex;gap:10px;align-items:center}

  /* -------- Stepper -------- */
  .stepper{
    display:grid;grid-template-columns:repeat(5, 1fr);
    gap:10px;
    padding:14px;
    border:1px solid var(--line);
    border-radius:14px;
    background:linear-gradient(180deg, rgba(255,255,255,.02), rgba(255,255,255,0));
    margin-bottom:24px;
    position:relative;
  }
  .step{
    display:flex;align-items:center;gap:12px;
    padding:12px 14px;
    border-radius:10px;
    position:relative;
    min-width:0;
  }
  .step .num{
    width:26px;height:26px;border-radius:50%;
    display:grid;place-items:center;
    font-family:var(--mono);font-size:12px;font-weight:600;
    background:var(--bg-3);color:var(--text-2);
    border:1px solid var(--line-strong);
    flex-shrink:0;
  }
  .step.done .num{background:rgba(34,224,122,.12);color:var(--accent);border-color:rgba(34,224,122,.4)}
  .step.active .num{background:var(--accent);color:var(--accent-ink);border-color:transparent;box-shadow:var(--accent-glow)}
  .step .label{font-size:12.5px;color:var(--text-2);text-transform:uppercase;letter-spacing:.08em;font-weight:500}
  .step.active .label{color:var(--text-0)}
  .step.done .label{color:var(--text-1)}
  .step .sub{font-size:11px;color:var(--text-3);font-family:var(--mono);margin-top:1px}
  .step .meta{display:flex;flex-direction:column;min-width:0}

  .step-divider{
    position:absolute;top:50%;right:-6px;width:12px;height:1px;
    background:var(--line-strong);
  }
  .step:last-child .step-divider{display:none}

  /* -------- Main grid -------- */
  .main{
    display:grid;
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 1fr);
    gap:20px;
  }
  /* Layout: stacked */
  body.layout-stacked .main{grid-template-columns:1fr}
  body.layout-stacked .console-body{min-height:260px;max-height:360px}

  /* Layout: drawer */
  body.layout-drawer .main{grid-template-columns:1fr}
  body.layout-drawer .console-card{
    position:fixed;top:0;right:0;bottom:0;width:min(640px, 92vw);
    z-index:40;border-radius:0;border-left:1px solid var(--line-strong);
    transform:translateX(100%);transition:transform .25s ease;
    box-shadow:-20px 0 60px -10px rgba(0,0,0,.7);
  }
  body.layout-drawer.drawer-open .console-card{transform:translateX(0)}
  body.layout-drawer .console-body{min-height:0;max-height:none;flex:1}
  .drawer-toggle{
    display:none;position:fixed;bottom:20px;right:20px;z-index:35;
    padding:12px 16px;border-radius:999px;
    background:var(--accent);color:var(--accent-ink);font-weight:600;
    border:0;cursor:pointer;font-size:13px;
    box-shadow:0 10px 30px -8px rgba(34,224,122,.5);
    align-items:center;gap:8px;font-family:var(--sans);
  }
  body.layout-drawer .drawer-toggle{display:inline-flex}
  body.layout-drawer.drawer-open .drawer-toggle{display:none}

  .card{
    background:linear-gradient(180deg, var(--bg-1), var(--bg-2) 60%);
    border:1px solid var(--line);
    border-radius:var(--radius);
    overflow:hidden;
    position:relative;
  }
  .card::before{
    content:"";position:absolute;inset:0 0 auto 0;height:1px;
    background:linear-gradient(90deg, transparent, rgba(255,255,255,.05), transparent);
  }

  .card-head{
    display:flex;align-items:center;justify-content:space-between;
    padding:14px 18px;
    border-bottom:1px solid var(--line);
    background:rgba(255,255,255,.015);
  }
  .card-head h2{
    margin:0;font-size:11px;font-weight:600;letter-spacing:.14em;
    text-transform:uppercase;color:var(--text-2);
    display:flex;align-items:center;gap:10px;
  }
  .card-head h2 .dot{width:6px;height:6px;border-radius:50%;background:var(--accent);box-shadow:0 0 10px var(--accent)}

  /* -------- Device section -------- */
  .device{
    padding:20px 22px 18px;
    display:flex;flex-direction:column;gap:20px;
    border-bottom:1px solid var(--line);
  }
  .device-head{display:flex;align-items:flex-start;justify-content:space-between;gap:16px}
  .serial-label{font-size:10.5px;letter-spacing:.14em;color:var(--text-3);text-transform:uppercase;font-weight:500;margin-bottom:6px}
  .serial{
    font-family:var(--mono);font-size:22px;font-weight:600;
    letter-spacing:-0.01em;color:var(--text-0);
    display:flex;align-items:center;gap:10px;
  }
  .serial .copy{
    width:26px;height:26px;display:grid;place-items:center;
    border-radius:6px;background:transparent;border:1px solid var(--line);
    color:var(--text-3);cursor:pointer;transition:.15s;
  }
  .serial .copy:hover{color:var(--text-0);border-color:var(--line-strong);background:var(--bg-3)}

  .manufactured{
    display:inline-flex;align-items:center;gap:8px;
    padding:5px 10px;border-radius:999px;
    background:rgba(34,224,122,.08);
    border:1px solid rgba(34,224,122,.22);
    color:var(--accent);
    font-family:var(--mono);font-size:10.5px;font-weight:600;
    letter-spacing:.1em;text-transform:uppercase;
    margin-top:8px;
  }
  .manufactured .pulse{
    width:6px;height:6px;border-radius:50%;background:var(--accent);
    box-shadow:0 0 8px var(--accent);
    animation:pulse 2s infinite;
  }
  @keyframes pulse{
    0%,100%{opacity:1;transform:scale(1)}
    50%{opacity:.6;transform:scale(.85)}
  }

  .board-grid{
    display:grid;grid-template-columns:repeat(3,minmax(0,1fr));
    gap:10px;
  }
  .board-cell{
    padding:12px 14px;
    border:1px solid var(--line);
    border-radius:10px;
    background:rgba(255,255,255,.015);
  }
  .board-cell .k{font-size:10.5px;letter-spacing:.14em;color:var(--text-3);text-transform:uppercase;font-weight:500;margin-bottom:6px}
  .board-cell .v{font-family:var(--mono);font-size:14px;color:var(--text-0);font-weight:500;display:flex;align-items:center;gap:8px}
  .board-cell .v .sub{color:var(--text-3);font-weight:400;font-size:12.5px}
  .board-cell .pill{
    display:inline-block;padding:1px 7px;border-radius:4px;
    background:rgba(180,139,255,.12);color:var(--violet);
    font-size:10.5px;font-weight:600;letter-spacing:.05em;
    border:1px solid rgba(180,139,255,.22);
    text-transform:uppercase;
  }

  /* -------- Port status -------- */
  .port-bar{
    display:flex;align-items:center;gap:12px;
    padding:10px 14px;border-radius:10px;
    border:1px solid var(--line);
    background:var(--bg-2);
  }
  .port-bar .status-dot{
    width:8px;height:8px;border-radius:50%;
    background:var(--text-3);
    flex-shrink:0;
  }
  .port-bar.connected .status-dot{background:var(--accent);box-shadow:0 0 10px var(--accent)}
  .port-bar.flashing .status-dot{background:var(--warn);box-shadow:0 0 10px var(--warn);animation:pulse 1s infinite}
  .port-bar .txt{font-family:var(--mono);font-size:12.5px;color:var(--text-1);flex:1;min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
  .port-bar .txt strong{color:var(--text-0);font-weight:600}
  .port-bar .baud{
    font-family:var(--mono);font-size:11px;color:var(--text-3);
    padding:3px 8px;border-radius:4px;background:var(--bg-3);
    border:1px solid var(--line);
  }

  /* -------- Settings section -------- */
  .settings{
    padding:18px 22px 20px;
    display:flex;flex-direction:column;gap:18px;
    border-bottom:1px solid var(--line);
  }
  .section-label{
    font-size:10.5px;letter-spacing:.14em;color:var(--text-3);
    text-transform:uppercase;font-weight:600;
    display:flex;align-items:center;gap:10px;
  }
  .section-label::after{content:"";flex:1;height:1px;background:var(--line)}

  /* Segmented NVS control */
  .segmented{
    display:inline-grid;grid-auto-flow:column;
    padding:3px;gap:3px;
    background:var(--bg-3);border:1px solid var(--line);
    border-radius:8px;
    position:relative;
  }
  .segmented button{
    border:0;background:transparent;
    color:var(--text-2);font-family:var(--sans);font-size:12.5px;font-weight:500;
    padding:7px 14px;border-radius:6px;cursor:pointer;
    display:flex;align-items:center;gap:8px;
    transition:.18s;
    letter-spacing:.01em;
  }
  .segmented button .tag{
    font-family:var(--mono);font-size:9.5px;
    padding:1px 5px;border-radius:3px;
    background:var(--bg-1);color:var(--text-3);
    border:1px solid var(--line-strong);
  }
  .segmented button:hover{color:var(--text-0)}
  .segmented button.active{
    background:var(--bg-1);color:var(--text-0);
    box-shadow: inset 0 0 0 1px var(--line-strong), 0 1px 0 rgba(0,0,0,.3);
  }
  .segmented button.active .tag{background:var(--accent);color:var(--accent-ink);border-color:transparent}
  .segmented button.active.legacy .tag{background:var(--warn);color:#2a1800}

  .row{display:flex;align-items:center;justify-content:space-between;gap:16px}

  /* Toggle */
  .toggle-row{
    display:flex;align-items:center;justify-content:space-between;gap:16px;
    padding:12px 14px;border-radius:10px;
    border:1px solid var(--line);
    background:rgba(255,255,255,.01);
  }
  .toggle-row.danger-row{
    border-color:rgba(255,90,106,.2);
    background:rgba(255,90,106,.04);
  }
  .toggle-text .t{font-size:13.5px;color:var(--text-0);font-weight:500}
  .toggle-text .d{font-size:12px;color:var(--text-2);margin-top:2px}
  .toggle-row.danger-row .toggle-text .t{color:#ffb9c0}
  .toggle-row.danger-row .toggle-text .d{color:#d98d95}

  .switch{position:relative;display:inline-block;width:38px;height:22px;flex-shrink:0}
  .switch input{opacity:0;width:0;height:0}
  .switch .slider{
    position:absolute;inset:0;cursor:pointer;
    background:var(--bg-3);border:1px solid var(--line-strong);
    border-radius:999px;transition:.2s;
  }
  .switch .slider::before{
    content:"";position:absolute;height:14px;width:14px;left:3px;top:50%;transform:translateY(-50%);
    background:var(--text-2);border-radius:50%;transition:.2s;
  }
  .switch input:checked + .slider{background:var(--accent-dim);border-color:rgba(34,224,122,.4)}
  .switch input:checked + .slider::before{transform:translate(16px, -50%);background:var(--accent)}
  .toggle-row.danger-row .switch input:checked + .slider{background:rgba(255,90,106,.2);border-color:rgba(255,90,106,.4)}
  .toggle-row.danger-row .switch input:checked + .slider::before{background:var(--danger)}

  /* -------- Flash map -------- */
  .flash-map{
    padding:18px 22px 20px;
    display:flex;flex-direction:column;gap:10px;
  }
  .partition{
    display:grid;
    grid-template-columns: 22px minmax(0,1fr) auto;
    grid-template-rows: auto auto;
    align-items:center;
    column-gap:14px;
    row-gap:8px;
    padding:12px 14px;
    border:1px solid var(--line);
    border-radius:10px;
    background:rgba(255,255,255,.012);
    position:relative;
    transition:.2s;
  }
  .partition .icon{grid-column:1;grid-row:1}
  .partition .info{grid-column:2;grid-row:1;min-width:0}
  .partition .pct{grid-column:3;grid-row:1;min-width:48px}
  .partition .bar{grid-column:1 / -1;grid-row:2;width:100%}
  .partition.active{
    border-color:rgba(34,224,122,.25);
    background:rgba(34,224,122,.03);
  }
  .partition.complete{
    border-color:rgba(34,224,122,.18);
  }
  .partition .icon{
    width:22px;height:22px;display:grid;place-items:center;
    color:var(--text-3);
  }
  .partition.active .icon{color:var(--accent)}
  .partition.complete .icon{color:var(--accent)}

  .partition .info .name{font-size:13px;color:var(--text-0);font-weight:500}
  .partition .info .addr{font-family:var(--mono);font-size:11px;color:var(--text-3);margin-top:2px}
  .partition.active .info .addr{color:var(--accent)}

  .bar{
    height:6px;background:var(--bg-3);border-radius:3px;overflow:hidden;
    position:relative;border:1px solid var(--line);
  }
  .bar-fill{
    height:100%;background:var(--accent);border-radius:3px;
    transition:width .3s ease;
    position:relative;
    box-shadow:0 0 8px rgba(34,224,122,.4);
  }
  .bar-fill::after{
    content:"";position:absolute;inset:0;
    background:linear-gradient(90deg, transparent, rgba(255,255,255,.25), transparent);
    animation:shimmer 1.4s infinite;
  }
  .partition.complete .bar-fill::after{display:none}
  @keyframes shimmer{0%{transform:translateX(-100%)}100%{transform:translateX(100%)}}

  .partition .pct{
    font-family:var(--mono);font-size:12px;color:var(--text-2);
    text-align:right;font-weight:500;
    font-variant-numeric:tabular-nums;
  }
  .partition.active .pct{color:var(--accent)}
  .partition.complete .pct{color:var(--accent)}

  /* -------- Footer / Action bar -------- */
  .action-bar{
    display:flex;align-items:center;justify-content:space-between;gap:14px;
    padding:14px 22px;
    background:rgba(0,0,0,.25);
    border-top:1px solid var(--line);
  }
  .meta-inline{
    font-family:var(--mono);font-size:11px;color:var(--text-3);
    display:flex;align-items:center;gap:10px;
    flex-wrap:wrap;
  }
  .meta-inline .sep{color:var(--line-strong)}
  .meta-inline .k{color:var(--text-3)}
  .meta-inline .v{color:var(--text-1)}

  /* Buttons */
  .btn{
    display:inline-flex;align-items:center;justify-content:center;gap:9px;
    padding:10px 16px;
    font-family:var(--sans);font-size:13.5px;font-weight:600;
    border-radius:8px;border:1px solid var(--line-strong);
    background:var(--bg-3);color:var(--text-0);
    cursor:pointer;transition:.15s;
    letter-spacing:.005em;
  }
  .btn:hover{background:var(--bg-2);border-color:#3a4756}
  .btn svg{width:15px;height:15px}
  .btn-ghost{background:transparent;border-color:var(--line)}
  .btn-ghost:hover{background:var(--bg-3)}
  .btn-primary{
    background:var(--accent);color:var(--accent-ink);
    border-color:transparent;
    box-shadow:0 1px 0 rgba(255,255,255,.18) inset, 0 8px 24px -10px rgba(34,224,122,.6);
  }
  .btn-primary:hover{background:#2df088;box-shadow:0 1px 0 rgba(255,255,255,.2) inset, 0 10px 28px -8px rgba(34,224,122,.75)}
  .btn-danger{background:rgba(255,90,106,.1);color:#ff8690;border-color:rgba(255,90,106,.25)}
  .btn-danger:hover{background:rgba(255,90,106,.15)}
  .btn-lg{padding:13px 22px;font-size:14.5px}
  .btn .kbd{font-family:var(--mono);font-size:10px;padding:1px 5px;border-radius:3px;background:rgba(0,0,0,.2);color:inherit;border:1px solid rgba(0,0,0,.3);opacity:.7}
  .btn-primary .kbd{background:rgba(0,0,0,.15);border-color:rgba(0,0,0,.25)}

  /* -------- Console / Log panel -------- */
  .console-card{
    display:flex;flex-direction:column;
    min-height:0;
    background:linear-gradient(180deg, #080b0e, #05070a);
  }
  .console-head{
    display:flex;align-items:center;justify-content:space-between;
    padding:14px 18px;
    border-bottom:1px solid var(--line);
    background:rgba(0,0,0,.35);
  }
  .console-head .tabs{display:flex;gap:2px;font-family:var(--mono);font-size:11px}
  .console-head .tabs button{
    background:transparent;border:0;color:var(--text-3);cursor:pointer;
    padding:6px 10px;border-radius:5px;
    font-family:inherit;font-size:inherit;letter-spacing:.05em;text-transform:uppercase;
  }
  .console-head .tabs button.active{color:var(--text-0);background:var(--bg-3)}
  .console-head .tools{display:flex;gap:6px}
  .console-head .tools button{
    width:28px;height:28px;border-radius:6px;
    display:grid;place-items:center;
    background:transparent;border:1px solid var(--line);
    color:var(--text-3);cursor:pointer;
  }
  .console-head .tools button:hover{color:var(--text-0);border-color:var(--line-strong);background:var(--bg-3)}
  .console-head .tools button svg{width:13px;height:13px}

  .console-body{
    flex:1;
    font-family:var(--mono);font-size:12px;line-height:1.65;
    padding:14px 18px 12px;
    overflow:auto;
    color:#b8c4d0;
    min-height:440px;
    max-height:560px;
    scrollbar-width:thin;scrollbar-color: var(--line-strong) transparent;
    background:
      repeating-linear-gradient(180deg, rgba(255,255,255,.012) 0 1px, transparent 1px 24px);
  }
  .console-body::-webkit-scrollbar{width:8px;height:8px}
  .console-body::-webkit-scrollbar-thumb{background:var(--line-strong);border-radius:4px}

  .log-line{display:grid;grid-template-columns: 100px 56px 1fr;gap:14px;padding:1px 0;white-space:pre-wrap;word-break:break-word}
  .log-time{color:#4a5562;font-variant-numeric:tabular-nums;white-space:nowrap}
  .log-level{font-weight:600;letter-spacing:.04em}
  .log-level.info{color:#6aa9ff}
  .log-level.ok{color:var(--accent)}
  .log-level.warn{color:var(--warn)}
  .log-level.err{color:var(--danger)}
  .log-level.dbg{color:#8a97a4}
  .log-msg .tok-hex{color:#b48bff}
  .log-msg .tok-num{color:#5ab0ff}
  .log-msg .tok-file{color:var(--accent)}
  .log-msg .tok-em{color:#eef3f8;font-weight:600}
  .log-msg .tok-mut{color:#6a7683}

  .caret{display:inline-block;width:7px;height:13px;background:var(--accent);vertical-align:middle;animation:blink 1s steps(2) infinite;margin-left:4px}
  @keyframes blink{50%{opacity:0}}

  .console-empty{
    display:flex;flex-direction:column;align-items:center;justify-content:center;
    height:100%;min-height:420px;
    color:var(--text-3);font-family:var(--mono);font-size:12px;
    gap:14px;
    text-align:center;
  }
  .console-empty .bigdot{
    width:54px;height:54px;border-radius:50%;
    background:radial-gradient(circle at 30% 30%, #1a2430, #0c1319);
    border:1px solid var(--line);
    display:grid;place-items:center;
  }
  .console-empty .bigdot svg{width:22px;height:22px;color:var(--text-3)}

  .console-foot{
    display:flex;align-items:center;justify-content:space-between;
    padding:6px 18px;border-top:1px solid var(--line);
    font-family:var(--mono);font-size:10.5px;color:var(--text-3);
    letter-spacing:.05em;text-transform:uppercase;
    background:rgba(0,0,0,.25);
    line-height:1.4;
  }
  .console-foot .stats{display:flex;gap:16px}
  .console-foot strong{color:var(--text-1);font-weight:600}

  /* -------- Tweaks panel -------- */
  .tweaks{
    position:fixed;bottom:20px;right:20px;z-index:30;
    width:260px;
    background:var(--bg-1);border:1px solid var(--line-strong);
    border-radius:12px;
    padding:14px;
    display:none;
    box-shadow:0 20px 60px -20px rgba(0,0,0,.8);
    font-size:12.5px;
  }
  .tweaks.on{display:block}
  .tweaks h3{margin:0 0 10px;font-size:11px;letter-spacing:.14em;text-transform:uppercase;color:var(--text-2)}
  .tweaks .tw-row{display:flex;align-items:center;justify-content:space-between;gap:10px;padding:6px 0}
  .tweaks .tw-row label{color:var(--text-1)}
  .tweaks select{
    background:var(--bg-3);color:var(--text-0);
    border:1px solid var(--line-strong);border-radius:6px;
    padding:5px 8px;font-family:var(--mono);font-size:11px;
  }

  /* Small helpers */
  .hide{display:none !important}

  @media (max-width: 1100px){
    .main{grid-template-columns:1fr}
    .stepper{grid-template-columns:repeat(5, minmax(0,1fr));font-size:11px}
  }