:root{
  --bg:#070b16;
  --bg-2:#0b1224;
  --panel:#0d1426;
  --panel-2:#101a2e;
  --muted:#8fa3c8;
  --muted-2:#6b7fa6;
  --text:#e8f0ff;
  --line:#1f2c4f;
  --accent:#5eead4;
  --accent-2:#22d3ee;
  --warm:#f59e0b;
  --hot:#ef4444;
  --red:#ff4d4d;
  --green:#46d37a;
  --violet:#8b5cf6;
  --node:#ffffff;
  --gnd:#46d37a;
  --shadow: 0 10px 30px rgba(0,0,0,0.45);
  --glow-acc: 0 0 0 1px rgba(94,234,212,0.25), 0 8px 24px rgba(34,211,238,0.18);
}

*{ box-sizing:border-box; }

html, body{ height:100%; }

body{
  margin:0;
  font-family: ui-sans-serif, system-ui, "Inter", Segoe UI, Roboto, Arial;
  color: var(--text);
  height: 100dvh;
  overflow: hidden;
  background:
    radial-gradient(900px 540px at 18% 8%, #16244b 0%, transparent 60%),
    radial-gradient(700px 500px at 92% 92%, #1a1244 0%, transparent 55%),
    linear-gradient(180deg, #070b16 0%, #060912 100%);
}

/* ============== Layout ============== */
.app{
  display:grid;
  grid-template-columns: 340px 1fr;
  height: 100dvh;
}

.panel{
  position:relative;
  background:
    linear-gradient(180deg, rgba(13,20,38,0.94), rgba(7,11,22,0.94));
  border-right:1px solid rgba(255,255,255,0.06);
  padding:14px 14px 80px;
  overflow:auto;
  scrollbar-width: thin;
  scrollbar-color: rgba(255,255,255,0.16) transparent;
}
.panel::-webkit-scrollbar{ width:8px; }
.panel::-webkit-scrollbar-thumb{ background: rgba(255,255,255,0.12); border-radius:8px; }

/* Header */
.brand{
  display:flex; align-items:center; gap:10px;
  margin: 2px 2px 12px;
}
.brand .logo{
  width:34px; height:34px; border-radius:10px;
  background:
    radial-gradient(circle at 30% 30%, rgba(94,234,212,0.9), rgba(34,211,238,0.5) 60%, transparent 70%),
    linear-gradient(135deg, #0f2742, #182241);
  box-shadow: 0 4px 14px rgba(34,211,238,0.35), inset 0 0 0 1px rgba(255,255,255,0.10);
  display:flex; align-items:center; justify-content:center;
  color:#cdfdf2;
}
.brand h1{ font-size:15px; margin:0; letter-spacing:0.2px; }
.brand .tag{ font-size:11px; color:var(--muted); margin-top:2px; }

/* Card */
.card{
  background: linear-gradient(180deg, rgba(255,255,255,0.035), rgba(255,255,255,0.015));
  border: 1px solid rgba(255,255,255,0.07);
  border-radius: 14px;
  padding: 10px 10px 12px;
  margin: 10px 0;
  box-shadow: 0 8px 22px rgba(0,0,0,0.25);
}

/* Section header */
.section-title{
  display:flex; align-items:center; gap:8px;
  text-transform: uppercase;
  letter-spacing: 1px;
  font-size: 10.5px;
  color: var(--muted-2);
  margin: 4px 4px 10px;
}
.section-title::after{
  content:""; flex:1; height:1px;
  background: linear-gradient(90deg, rgba(255,255,255,0.10), transparent);
}

/* Tool grid */
.tool-grid{
  display:grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 8px;
}
.tool-grid.three{ grid-template-columns: repeat(3, 1fr); }
.tool-grid.three .tool-btn{
  font-size: 11px;
  padding: 8px 6px;
  gap: 6px;
}
.tool-grid.three .tool-btn .ico{ width:18px; height:18px; }

.tool-btn{
  position: relative;
  display:flex; align-items:center; gap:8px;
  padding: 9px 10px;
  border-radius: 11px;
  background: rgba(255,255,255,0.04);
  border:1px solid rgba(255,255,255,0.08);
  color: var(--text);
  cursor: pointer;
  font-size: 12.5px;
  font-weight: 600;
  text-align:left;
  transition: transform .12s ease, background .15s, border-color .15s, box-shadow .15s;
}
.tool-btn .ico{
  width:22px; height:22px; flex:none;
  display:inline-flex; align-items:center; justify-content:center;
  color: var(--accent);
  filter: drop-shadow(0 0 4px rgba(94,234,212,0.35));
}
.tool-btn:hover{
  background: rgba(255,255,255,0.07);
  border-color: rgba(94,234,212,0.30);
  transform: translateY(-1px);
}
.tool-btn:active{ transform: translateY(0); }
.tool-btn.active{
  background: linear-gradient(180deg, rgba(94,234,212,0.18), rgba(34,211,238,0.12));
  border-color: rgba(94,234,212,0.55);
  box-shadow: var(--glow-acc);
  color:#e9fffb;
}
.tool-btn.active .ico{
  color:#9bf3e2;
  filter: drop-shadow(0 0 8px rgba(94,234,212,0.6));
}

.tool-btn.good{
  background: linear-gradient(180deg, rgba(70,211,122,0.22), rgba(70,211,122,0.10));
  border-color: rgba(70,211,122,0.50);
}
.tool-btn.good:hover{ background: linear-gradient(180deg, rgba(70,211,122,0.32), rgba(70,211,122,0.14)); }
.tool-btn.good .ico{ color:#9af0bb; filter: drop-shadow(0 0 8px rgba(70,211,122,0.55)); }

.tool-btn.warn{
  background: rgba(245,158,11,0.12);
  border-color: rgba(245,158,11,0.40);
}
.tool-btn.warn .ico{ color:#fcd47a; }

.tool-btn.danger{
  background: rgba(255,77,77,0.10);
  border-color: rgba(255,77,77,0.35);
}
.tool-btn.danger .ico{ color:#ff9ea0; }

.row{ display:flex; gap:8px; flex-wrap:wrap; align-items:center; }
.row.space{ justify-content:space-between; align-items:flex-end; }

/* Mode pills */
.modes{
  display:flex; gap:6px; flex-wrap:wrap;
  padding: 4px; background: rgba(255,255,255,0.04);
  border-radius: 12px; border:1px solid rgba(255,255,255,0.07);
}
.mode-pill{
  flex:1 1 0; min-width: 70px;
  padding:8px 10px; border-radius: 9px;
  font-size: 11.5px; font-weight: 700;
  background: transparent; color: var(--muted);
  border:0; cursor: pointer;
  display:flex; align-items:center; justify-content:center; gap:6px;
  transition: background .15s, color .15s, transform .12s;
}
.mode-pill:hover{ color: var(--text); background: rgba(255,255,255,0.05); }
.mode-pill.active{
  background: linear-gradient(180deg, rgba(94,234,212,0.20), rgba(34,211,238,0.08));
  color:#eafffb;
  box-shadow: 0 0 0 1px rgba(94,234,212,0.35), 0 6px 14px rgba(34,211,238,0.15);
}

/* Pill (current tool indicator) */
.pill{
  display:flex; align-items:center; gap:10px;
  padding:8px 12px; border-radius:999px;
  background: rgba(255,255,255,0.05);
  border: 1px solid rgba(255,255,255,0.10);
  font-size:12px; color: var(--muted);
}
.pill strong{ color: var(--text); }
.pill .dot{
  width:8px; height:8px; border-radius:50%;
  background: var(--accent);
  box-shadow: 0 0 8px rgba(94,234,212,0.7);
  animation: pulse 1.8s ease-in-out infinite;
}

@keyframes pulse{
  0%, 100%{ opacity:0.55; transform: scale(.9); }
  50%{ opacity:1; transform: scale(1.1); }
}

/* Status */
.status{
  margin-top:10px;
  padding:9px 12px;
  border-radius:12px;
  border:1px solid rgba(255,255,255,0.08);
  background: rgba(255,255,255,0.03);
  font-size:12px;
  line-height:1.4;
}
.status.ok{
  border-color: rgba(94,234,212,0.30);
  background: linear-gradient(180deg, rgba(94,234,212,0.10), rgba(34,211,238,0.05));
}
.status.warn{
  border-color: rgba(255,77,77,0.40);
  background: rgba(255,77,77,0.10);
}

/* Inputs */
label{ font-size:11.5px; color: var(--muted); display:block; margin-bottom:6px; letter-spacing:.3px; }
input[type="number"]{
  width:100%;
  padding:9px 10px;
  border-radius:10px;
  border:1px solid rgba(255,255,255,0.12);
  background: rgba(0,0,0,0.28);
  color: var(--text);
  outline:none;
  transition: border-color .15s, box-shadow .15s;
  font-variant-numeric: tabular-nums;
}
input[type="number"]:focus{
  border-color: rgba(94,234,212,0.55);
  box-shadow: 0 0 0 3px rgba(94,234,212,0.10);
}

.small{ font-size:11.5px; color: var(--muted); }
.mono{ font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; }

.sep{
  border:0;
  border-top:1px solid rgba(255,255,255,0.06);
  margin:10px 0;
}

.prop{ margin-top:10px; }

/* Result cards */
.results-grid{
  display:grid; gap:8px;
  grid-template-columns: 1fr 1fr;
}
.metric{
  position: relative;
  background: linear-gradient(180deg, rgba(255,255,255,0.04), rgba(255,255,255,0.015));
  border:1px solid rgba(255,255,255,0.07);
  border-radius: 12px;
  padding: 10px 12px;
  overflow: hidden;
}
.metric .label{
  font-size: 10.5px; color: var(--muted);
  text-transform: uppercase; letter-spacing: 1px;
  display:flex; align-items:center; gap:6px;
}
.metric .value{
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 18px;
  font-weight: 700;
  letter-spacing: 0.3px;
  margin-top: 4px;
  color: var(--text);
  font-variant-numeric: tabular-nums;
}
.metric.accent{
  border-color: rgba(94,234,212,0.30);
}
.metric.accent .value{ color:#bff7eb; }
.metric.warm{ border-color: rgba(245,158,11,0.30); }
.metric.warm .value{ color:#fdd58d; }
.metric.hot{ border-color: rgba(239,68,68,0.32); }
.metric.hot .value{ color:#fda4a4; }
.metric .spark{
  position:absolute; right:-8px; top:-8px;
  width: 60px; height: 60px; border-radius: 50%;
  background: radial-gradient(circle, currentColor 0%, transparent 65%);
  opacity: .12; color: var(--accent);
  pointer-events:none;
}
.metric.warm .spark{ color: var(--warm); }
.metric.hot .spark{ color: var(--hot); }

/* Branches list */
.branch-list{
  max-height: 180px; overflow:auto;
  display:flex; flex-direction:column; gap:6px;
  padding: 4px 2px 2px;
  font-size: 11.5px;
}
.branch-list::-webkit-scrollbar{ width:6px; }
.branch-list::-webkit-scrollbar-thumb{ background: rgba(255,255,255,0.10); border-radius:6px; }
.branch-row{
  display:flex; align-items:center; gap:8px;
  padding:6px 8px; border-radius:9px;
  background: rgba(255,255,255,0.02);
  border:1px solid rgba(255,255,255,0.05);
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}
.branch-row .tag{
  font-size:10px; padding:2px 6px; border-radius:6px;
  background: rgba(94,234,212,0.12); color:#a8f1e2;
  border:1px solid rgba(94,234,212,0.25);
  letter-spacing:.4px;
}
.branch-row .tag.bat{ background: rgba(245,158,11,0.16); color:#fdd58d; border-color: rgba(245,158,11,0.32); }
.branch-row .tag.am { background: rgba(139,92,246,0.18);  color:#d6c4ff; border-color: rgba(139,92,246,0.30); }
.branch-row .tag.rh { background: rgba(34,211,238,0.16); color:#a7e8f3; border-color: rgba(34,211,238,0.32); }
.branch-row .tag.wire{background: rgba(255,255,255,0.08); color:#cfd9ec; border-color: rgba(255,255,255,0.15); }
.branch-row .vals{ margin-left:auto; color: var(--muted); }
.branch-row .vals b{ color: var(--text); }

.empty{
  color: var(--muted-2); font-size: 12px; text-align:center;
  padding: 14px 6px;
}

/* Education panel */
.edu-panel{
  display:flex; flex-direction:column; gap:8px;
  max-height: 220px; overflow:auto;
  padding-right: 2px;
}
.edu-step{
  position:relative;
  padding: 8px 10px 8px 28px;
  background: rgba(94,234,212,0.05);
  border:1px solid rgba(94,234,212,0.18);
  border-radius: 10px;
  font-size: 12px; line-height: 1.45;
  color: #d6f5ec;
  animation: fadeUp .3s ease both;
}
.edu-step::before{
  content: "";
  position:absolute; left:10px; top:13px;
  width:10px; height:10px; border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 8px rgba(94,234,212,0.7);
}
.edu-step .formula{
  display:block; margin-top:4px;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  color: #ffffff; font-size: 12px;
  background: rgba(0,0,0,0.28);
  padding: 4px 8px; border-radius: 6px;
  border:1px solid rgba(94,234,212,0.18);
}
@keyframes fadeUp{
  from{ opacity:0; transform: translateY(6px); }
  to{ opacity:1; transform: translateY(0); }
}

/* Challenges */
.challenge-list{ display:flex; flex-direction:column; gap:6px; }
.challenge{
  display:flex; align-items:center; gap:10px;
  padding: 8px 10px;
  border:1px dashed rgba(255,255,255,0.14);
  border-radius: 10px;
  background: rgba(255,255,255,0.02);
  font-size: 12px;
}
.challenge .badge{
  width: 22px; height:22px; border-radius:50%;
  display:flex; align-items:center; justify-content:center;
  background: linear-gradient(180deg, rgba(139,92,246,0.35), rgba(34,211,238,0.25));
  color:#fff; font-size: 11px; font-weight: 700;
  border:1px solid rgba(255,255,255,0.18);
}
.challenge .desc{ flex:1; color:#d8e2f5; }
.challenge .verify-btn{
  padding: 5px 9px; font-size: 11px;
  border-radius: 8px;
  background: rgba(94,234,212,0.14);
  color: #c6f7ec;
  border:1px solid rgba(94,234,212,0.30);
  cursor: pointer;
}
.challenge .verify-btn:hover{ background: rgba(94,234,212,0.22); }
.challenge.done{ border-color: rgba(70,211,122,0.45); background: rgba(70,211,122,0.06); }
.challenge.done .badge{ background: linear-gradient(180deg, rgba(70,211,122,0.5), rgba(70,211,122,0.30)); }

/* Tooltip (custom) */
.tip{
  position: fixed;
  pointer-events: none;
  z-index: 2000;
  background: linear-gradient(180deg, rgba(15,22,40,0.96), rgba(10,15,28,0.96));
  color: var(--text);
  border:1px solid rgba(94,234,212,0.22);
  border-radius: 12px;
  padding: 10px 12px;
  font-size: 12px;
  line-height: 1.5;
  max-width: 240px;
  opacity: 0; transform: translateY(4px);
  transition: opacity .18s ease, transform .18s ease;
  box-shadow: 0 12px 32px rgba(0,0,0,0.45);
}
.tip.show{ opacity:1; transform: translateY(0); }
.tip .ttitle{
  font-size: 12.5px; font-weight: 700;
  color: #d6fff5;
  margin-bottom: 4px;
}
.tip .tdesc{ color: #d2dceb; }
.tip .tform{
  display:inline-block; margin-top:6px;
  background: rgba(0,0,0,0.30);
  padding: 4px 8px; border-radius: 6px;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  color:#9bf3e2;
  border:1px solid rgba(94,234,212,0.20);
}

/* Floating UI on canvas */
.canvasWrap{
  position:relative;
  overflow:hidden;
}
canvas{ width:100%; height:100%; display:block; }

/* Vignette overlay */
.canvasWrap::after{
  content:"";
  position:absolute; inset:0;
  pointer-events:none;
  background:
    radial-gradient(120% 120% at 50% 50%, transparent 55%, rgba(0,0,0,0.55) 100%);
  mix-blend-mode: multiply;
}

/* HUD: mode picker over canvas */
.hud{
  position:absolute;
  top: 12px; left: 12px;
  display:flex; gap:8px; align-items:center;
  z-index: 10;
  pointer-events:auto;
}
.hud .modes{
  background: rgba(10,15,28,0.7);
  backdrop-filter: blur(10px);
  border-color: rgba(94,234,212,0.18);
  box-shadow: 0 6px 18px rgba(0,0,0,0.35);
}

.hud-right{
  position:absolute;
  top: 12px; right: 12px;
  z-index: 10;
  display:flex; gap:8px;
}
.hud-btn{
  display:inline-flex; align-items:center; gap:6px;
  padding:8px 10px; border-radius: 10px;
  background: rgba(10,15,28,0.7);
  backdrop-filter: blur(10px);
  border:1px solid rgba(255,255,255,0.10);
  color: var(--text); font-size: 12px; font-weight:600;
  cursor: pointer;
  transition: background .15s, border-color .15s;
}
.hud-btn:hover{ background: rgba(20,30,55,0.85); border-color: rgba(94,234,212,0.30); }
.hud-btn .ico{ color: var(--accent); display:inline-flex; }

/* Hint (bottom-left) */
.hint{
  position:absolute;
  left:12px;
  bottom:12px;
  background: rgba(10,16,30,0.72);
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: 12px;
  padding: 9px 12px;
  color: var(--muted);
  font-size:11.5px;
  backdrop-filter: blur(8px);
  max-width: min(560px, calc(100% - 24px));
  line-height:1.4;
  z-index: 9;
  pointer-events: none;
}

/* Toggle (mobile) */
.panelToggle{
  display:none;
  position: fixed;
  top: 10px;
  left: 10px;
  z-index: 1400;
  border: 1px solid rgba(255,255,255,0.18);
  border-radius: 10px;
  padding: 8px 10px;
  font-size: 20px;
  line-height: 1;
  background: rgba(13,20,38,0.92);
  color: var(--text);
  backdrop-filter: blur(8px);
}

/* Flash overlay (snap on connect) */
.flash{
  position:absolute; inset:0; pointer-events:none;
  z-index: 5;
  background: radial-gradient(circle at var(--fx, 50%) var(--fy, 50%), rgba(94,234,212,0.32) 0%, transparent 22%);
  opacity: 0;
}
.flash.on{
  animation: flashKey .42s ease-out;
}
@keyframes flashKey{
  0%{ opacity: 0; }
  20%{ opacity: 1; }
  100%{ opacity: 0; }
}

/* Responsive */
@media (max-width: 1024px){
  .app{
    grid-template-columns: 1fr;
    height: 100dvh;
  }
  .canvasWrap{
    width: 100%;
    height: 100dvh;
    overflow: auto;
    -webkit-overflow-scrolling: touch;
  }
  .canvasWrap canvas{
    width: 1400px;
    height: 900px;
    max-width: none;
    max-height: none;
    display: block;
  }
  .panel{
    position: fixed;
    left: 0;
    top: 0;
    width: min(88vw, 360px);
    height: 100dvh;
    z-index: 1300;
    transform: translateX(-100%);
    transition: transform .25s ease-in-out;
    border-right:1px solid rgba(255,255,255,0.1);
  }
  .app.panel-open .panel{
    transform: translateX(0);
  }
  .panelToggle{
    display: inline-flex;
    align-items: center;
    justify-content: center;
  }
  .hud{ top: 60px; }
  .hint{
    left: 10px;
    right: 10px;
    bottom: 10px;
    max-width: none;
    font-size: 11px;
    padding: 8px 10px;
  }
}