* { margin: 0; padding: 0; box-sizing: border-box; }
:root {
  --bg-void: #020205;
  --bg-deep: #070714;
  --card: rgba(12, 12, 28, 0.71);
  --card-hover: rgba(18, 18, 38, 0.82);
  --text: #e2e8f0;
  --text-bright: #f8fafc;
  --muted: #8b8fa7;
  --primary: #7c3aed;
  --primary-glow: #6d28d9;
  --neon-cyan: #00f3ff;
  --neon-pink: #ff0055;
  --border: rgba(124, 58, 237, 0.15);
  --border-glow: rgba(0, 243, 255, 0.12);
  --radius: 14px;
  --shadow: 0 4px 24px rgba(0,0,0,.4);
  --shadow-lg: 0 8px 40px rgba(124,58,237,.15);
}
body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: var(--bg-void);
  color: var(--text);
  line-height: 1.6;
  min-height: 100vh;
  overflow-x: hidden;
}
#bg-canvas {
  position: fixed;
  top: 0; left: 0;
  width: 100vw; height: 100vh;
  z-index: -1;
  pointer-events: none;
}
.container { max-width: 1100px; margin: 0 auto; padding: 0 20px; position: relative; z-index: 1; }
main.container { padding-top: 40px; }


.header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: linear-gradient(135deg, rgba(12,12,28,.85), rgba(7,7,20,.92));
  border-bottom: 1px solid var(--border-glow);
  padding: 16px 0;
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  box-shadow: 0 4px 32px rgba(0,0,0,.3), inset 0 1px 0 rgba(255,255,255,.04);
}
.header::after {
  content: '';
  position: absolute;
  bottom: -1px;
  left: 10%;
  width: 80%;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--neon-cyan), var(--primary), var(--neon-pink), transparent);
  opacity: .3;
}
.header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}
.header-content {
  flex: 1;
  min-width: 0;
}
.logo {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  position: relative;
}
.logo-icon {
  font-size: 1.4rem;
  filter: drop-shadow(0 0 8px rgba(124,58,237,.3));
}
.logo-text {
  font-size: 1.4rem;
  font-weight: 800;
  letter-spacing: -.3px;
  background: linear-gradient(135deg, #f8fafc, #a78bfa, #f472b6);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.tagline {
  margin-top: 2px;
  display: flex;
  align-items: center;
  gap: 6px;
  flex-wrap: wrap;
  font-size: .75rem;
}
.tagline-text { color: var(--muted); letter-spacing: .2px; }
.tag-badge {
  display: inline-block;
  padding: 1px 8px;
  border-radius: 4px;
  font-size: .6rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .5px;
  background: rgba(0,243,255,.08);
  color: var(--neon-cyan);
  border: 1px solid rgba(0,243,255,.12);
}
.tool-count-badge {
  background: rgba(124,58,237,.1);
  color: #a78bfa;
  border-color: rgba(124,58,237,.18);
}
.header-actions {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-shrink: 0;
}
.header-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 34px;
  height: 34px;
  border-radius: 8px;
  font-size: 1rem;
  color: var(--muted);
  background: rgba(255,255,255,.03);
  border: 1px solid var(--border);
  cursor: pointer;
  transition: all .15s;
}
.header-btn:hover {
  color: var(--text-bright);
  background: rgba(255,255,255,.07);
  border-color: var(--primary);
  box-shadow: 0 0 14px rgba(124,58,237,.12);
}
.gh-link {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 34px;
  height: 34px;
  border-radius: 8px;
  color: var(--muted);
  background: rgba(255,255,255,.03);
  border: 1px solid var(--border);
  transition: all .15s;
}
.gh-link:hover {
  color: var(--text-bright);
  background: rgba(255,255,255,.07);
  border-color: rgba(124,58,237,.3);
  box-shadow: 0 0 14px rgba(124,58,237,.1);
}


.tool-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 16px; padding: 32px 0;
}
.tool-card {
  background: var(--card); border-radius: var(--radius); padding: 24px; cursor: pointer;
  box-shadow: var(--shadow); border: 1px solid var(--border);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  transition: transform .2s, box-shadow .2s, border-color .2s;
}
.tool-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-lg);
  border-color: rgba(124,58,237,.35);
  background: var(--card-hover);
}
.tool-card .icon { font-size: 2rem; margin-bottom: 8px; display: block; }
.tool-card h3 { font-size: 1.05rem; margin-bottom: 4px; color: var(--text-bright); }
.tool-card p { font-size: .85rem; color: var(--muted); }


.tool-page { padding: 32px 0; }
.tool-page .back {
  display: inline-block; margin-bottom: 16px;
  color: var(--neon-cyan); cursor: pointer; font-size: .9rem; text-decoration: none;
  opacity: .8; transition: opacity .15s;
}
.tool-page .back:hover { opacity: 1; text-decoration: underline; }
.tool-page h1 { font-size: 1.5rem; margin-bottom: 8px; color: var(--text-bright); }
.tool-page .desc { color: var(--muted); margin-bottom: 24px; }

.tool-box {
  background: var(--card); border-radius: var(--radius); padding: 28px;
  box-shadow: var(--shadow); border: 1px solid var(--border);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}


label { display: block; font-size: .9rem; font-weight: 600; margin-bottom: 6px; color: var(--text); }
input, select, textarea {
  width: 100%; padding: 10px 14px;
  border: 1px solid rgba(255,255,255,.08); border-radius: 8px;
  font-size: .95rem;
  background: rgba(255,255,255,.04);
  color: var(--text);
  transition: border-color .15s, background .15s;
}
input:focus, select:focus, textarea:focus {
  outline: none;
  border-color: var(--primary);
  background: rgba(124,58,237,.08);
  box-shadow: 0 0 20px rgba(124,58,237,.08);
}
.btn {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 10px 22px; background: var(--primary); color: white; border: none;
  border-radius: 8px; font-size: .95rem; font-weight: 600; cursor: pointer;
  transition: background .15s, box-shadow .15s;
}
.btn:hover { background: var(--primary-glow); box-shadow: 0 0 24px rgba(124,58,237,.25); }
.btn-secondary {
  background: rgba(255,255,255,.06);
  color: var(--text);
  border: 1px solid rgba(255,255,255,.08);
}
.btn-secondary:hover {
  background: rgba(255,255,255,.1);
  border-color: var(--neon-cyan);
  box-shadow: 0 0 16px rgba(0,243,255,.08);
}
.btn-group { display: flex; gap: 8px; flex-wrap: wrap; margin: 16px 0; }
.result { margin-top: 16px; }
.result-box {
  background: rgba(15,15,35,.6);
  border: 1px solid rgba(124,58,237,.15);
  border-radius: 8px; padding: 16px;
  font-size: 1.1rem; word-break: break-all;
  backdrop-filter: blur(8px);
}
.result-box.error { background: rgba(220,38,38,.12); border-color: rgba(220,38,38,.3); color: #fca5a5; }


.split { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
@media (max-width: 640px) { .split { grid-template-columns: 1fr; } }


.calc-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 6px; max-width: 400px; margin: 0 auto; }
.calc-grid .calc-key {
  padding: 14px 8px; font-size: 1.1rem; justify-content: center;
  background: rgba(255,255,255,.04); color: var(--text); border-radius: 8px; min-height: 48px;
  border: 1px solid rgba(255,255,255,.05);
}
.calc-grid .calc-key:hover { background: rgba(255,255,255,.08); }
.calc-grid .calc-op { background: rgba(124,58,237,.12); color: #a78bfa; font-weight: 700; border-color: rgba(124,58,237,.15); }
.calc-grid .calc-op:hover { background: rgba(124,58,237,.2); }
.calc-grid .calc-eq {
  grid-column: span 4; padding: 14px; font-size: 1.2rem;
  background: linear-gradient(135deg, var(--primary), var(--neon-pink));
  color: white; border: none; border-radius: 8px; font-weight: 700; cursor: pointer;
  justify-content: center; display: flex; align-items: center; gap: 6px;
}
.calc-grid .calc-eq:hover { box-shadow: 0 0 30px rgba(124,58,237,.3); }


.md1-kbd { display: flex; flex-wrap: wrap; gap: 4px; margin: 8px 0; }
.md1-kbd button {
  font-size: .9rem; padding: 6px 12px; min-width: 36px;
  background: rgba(255,255,255,.04); color: var(--text);
  border: 1px solid rgba(255,255,255,.08); border-radius: 6px;
  cursor: pointer; font-family: monospace; transition: background .1s;
}
.md1-kbd button:hover { background: rgba(255,255,255,.08); }
.md1-kbd .kbd-var { background: rgba(124,58,237,.15); color: #a78bfa; font-weight: 700; border-color: rgba(124,58,237,.2); }
.md1-kbd .kbd-var:hover { background: rgba(124,58,237,.25); }
.md1-kbd .kbd-op { background: rgba(245,158,11,.1); color: #fbbf24; font-weight: 600; border-color: rgba(245,158,11,.15); }
.md1-kbd .kbd-op:hover { background: rgba(245,158,11,.18); }
.md1-kbd .kbd-action { background: var(--primary); color: white; font-weight: 600; border-color: var(--primary); }
.md1-kbd .kbd-action:hover { background: var(--primary-glow); }
.md1-kbd .kbd-del { background: rgba(220,38,38,.12); color: #fca5a5; font-weight: 600; border-color: rgba(220,38,38,.15); }
.md1-kbd .kbd-del:hover { background: rgba(220,38,38,.2); }
.md1-kbd .kbd-wide { font-size: .75rem; padding: 6px 10px; min-width: auto; }


.pw-display {
  display: flex; gap: 8px; align-items: center;
  background: rgba(255,255,255,.04); border: 1px solid rgba(255,255,255,.08);
  border-radius: 8px; padding: 10px 14px; margin-bottom: 12px;
}
.pw-display input { border: none; background: transparent; padding: 0; font-size: 1.1rem; font-family: monospace; color: var(--text); }
.pw-display input:focus { outline: none; }
.pw-length { display: flex; align-items: center; gap: 12px; }
.pw-length input[type="range"] { flex: 1; }
.pw-length span { font-size: .9rem; color: var(--muted); min-width: 28px; text-align: right; }
.checkbox-group { display: flex; flex-wrap: wrap; gap: 12px; margin: 12px 0; }
.checkbox-group label { font-weight: 400; font-size: .85rem; display: inline-flex; align-items: center; gap: 6px; cursor: pointer; }
.checkbox-group input[type="checkbox"] { width: auto; }


#qrcode { display: flex; justify-content: center; margin-top: 16px; }
#qrcode canvas, #qrcode img { max-width: 100%; }


.calc-canvas-wrap { width:100%; max-width:600px; margin:0 auto; }
.calc-canvas-wrap canvas { width:100%; height:auto; background:rgba(10,10,22,.5); border:1px solid rgba(255,255,255,.06); border-radius:8px; display:block; }
.calc-phys-grid { display:grid; grid-template-columns:1fr 1fr 1fr; gap:8px; }
.calc-phys-grid label { font-size:.8rem; }
.calc-phys-grid input { font-size:.85rem; padding:6px 10px; }
.calc-elec-grid { display:grid; grid-template-columns:1fr 1fr; gap:8px; }
.calc-elec-grid label { font-size:.8rem; }
.calc-comp-grid { display:grid; grid-template-columns:1fr 1fr 1fr 1fr; gap:6px; }
.calc-comp-grid button { font-size:.8rem; padding:8px; }
.calc-bases-grid { display:grid; grid-template-columns:1fr 1fr; gap:10px; }
.calc-bases-grid input { font-family:monospace; }
.calc-stat-grid { display:flex; gap:8px; flex-wrap:wrap; }
.calc-stat-grid .result-box { flex:1; min-width:120px; text-align:center; }


.truth-table { width: 100%; border-collapse: collapse; font-family: monospace; font-size: .85rem; margin-top: 8px; }
.truth-table th, .truth-table td { border: 1px solid rgba(255,255,255,.08); padding: 6px 12px; text-align: center; }
.truth-table th { background: rgba(124,58,237,.3); color: #e2e8f0; font-weight: 600; }
.truth-table td { background: rgba(255,255,255,.02); }
.truth-table td.tv { background: rgba(5,150,105,.15); color: #6ee7b7; font-weight: 700; }
.truth-table td.tf { background: rgba(220,38,38,.1); color: #fca5a5; font-weight: 700; }
.truth-table tr:nth-child(even) td:not(.tv):not(.tf) { background: rgba(255,255,255,.015); }


.footer { margin-top: 48px; padding: 24px 0; border-top: 1px solid rgba(255,255,255,.05); text-align: center; }
.footer-text { color: var(--muted); font-size: .8rem; margin-top: 16px; }


.tool-grid.editing .tool-card { position: relative; cursor: grab; border-color: var(--neon-cyan); border-style: dashed; }
.tool-grid.editing .tool-card:active { cursor: grabbing; }
.tool-card.dragging { opacity: 0.4; }
.drag-handle { position: absolute; top: 6px; right: 8px; cursor: grab; font-size: 1.2rem; color: var(--muted); user-select: none; line-height: 1; }
.drag-handle:hover { color: var(--neon-cyan); }


::-webkit-scrollbar { width: 8px; }
::-webkit-scrollbar-track { background: var(--bg-void); }
::-webkit-scrollbar-thumb { background: rgba(124,58,237,.3); border-radius: 4px; }
::-webkit-scrollbar-thumb:hover { background: rgba(124,58,237,.5); }


.cs { display:flex; flex-direction:column; gap:0; height:calc(100vh - 110px); min-height:400px; }
.cs-lbl { font-size:.75rem; color:var(--muted); text-transform:uppercase; letter-spacing:.5px; margin-right:2px; }
.cs-bar { display:flex; gap:6px; align-items:center; padding:8px 10px; background:rgba(0,0,0,.2); border-radius:10px 10px 0 0; border:1px solid var(--border); border-bottom:none; flex-wrap:wrap; }
.cs-lang { background:rgba(30,30,60,.9); color:var(--text); border:1px solid var(--border); border-radius:6px; padding:4px 8px; font-size:.8rem; cursor:pointer; }
.cs-lang option { background:#12122a; color:var(--text); padding:4px; }
.cs-lang:focus { outline:none; border-color:var(--primary); }
.cs-sep { width:1px; height:20px; background:var(--border); }
.cs-btn { padding:5px 12px; border-radius:6px; font-size:.8rem; font-weight:600; background:rgba(255,255,255,.04); color:var(--text); border:1px solid var(--border); cursor:pointer; transition:all .1s; white-space:nowrap; }
.cs-btn:hover { background:rgba(255,255,255,.08); border-color:rgba(124,58,237,.3); }
.cs-btn-primary { background:rgba(124,58,237,.15); color:#a78bfa; border-color:rgba(124,58,237,.2); }
.cs-btn-primary:hover { background:rgba(124,58,237,.25); }
.cs-layout-btn { font-size:.85rem; padding:4px 9px; line-height:1; }
.cs-layout-btn.active { background:rgba(124,58,237,.25); border-color:rgba(124,58,237,.5); }
.cs-tabs { display:flex; gap:2px; padding:0 10px; background:rgba(0,0,0,.15); border:1px solid var(--border); border-top:none; border-bottom:none; overflow-x:auto; }
.cs-tab { padding:6px 14px; font-size:.78rem; cursor:pointer; border-radius:6px 6px 0 0; color:var(--muted); transition:all .1s; display:flex; align-items:center; gap:6px; white-space:nowrap; border:1px solid transparent; border-bottom:none; margin-top:4px; }
.cs-tab:hover { color:var(--text); background:rgba(255,255,255,.03); }
.cs-tab.active { color:var(--text-bright); background:rgba(124,58,237,.08); border-color:rgba(124,58,237,.15); border-bottom-color:transparent; }
.cs-tab-close { font-size:.6rem; opacity:.3; cursor:pointer; padding:0 2px; }
.cs-tab-close:hover { opacity:1; color:var(--neon-pink); }
.cs-main { display:flex; flex:1; min-height:0; border:1px solid var(--border); border-top:none; }
.cs-main.cs-col { flex-direction:column; }
.cs-main.cs-rev { flex-direction:row-reverse; }
.cs-main.cs-col .cs-resizer { width:auto; height:4px; cursor:row-resize; border-left:none; border-top:1px solid var(--border); }
.cs-main.cs-col .cs-preview { border-left:none; border-top:1px solid var(--border); }
.cs-editor { flex:1; display:flex; position:relative; min-width:0; min-height:0; background:rgba(0,0,0,.25); }
.cs-gutter { width:44px; background:rgba(0,0,0,.15); border-right:1px solid var(--border); padding:8px 0; text-align:right; font-family:'JetBrains Mono','Fira Code',monospace; font-size:.85rem; line-height:1.55; color:var(--muted); overflow:hidden; user-select:none; padding-right:8px; }
.cs-textarea { flex:1; background:transparent; border:none; resize:none; padding:8px 12px; font-family:'JetBrains Mono','Fira Code',monospace; font-size:.85rem; line-height:1.55; color:var(--text); tab-size:2; outline:none; white-space:pre; overflow-wrap:normal; }
.cs-textarea::selection { background:rgba(124,58,237,.3); }
.cs-resizer { width:4px; cursor:col-resize; background:transparent; position:relative; z-index:2; flex-shrink:0; border-left:1px solid var(--border); transition:background .15s; }
.cs-resizer:hover { background:rgba(124,58,237,.3); }
.cs-resizer:active { background:rgba(124,58,237,.5); }
.cs-preview { flex:1; display:flex; align-items:stretch; justify-content:stretch; border-left:1px solid var(--border); background:white; position:relative; min-width:0; min-height:0; }
.cs-iframe { width:100%; height:100%; border:none; background:white; }
.cs-preview-empty { position:absolute; inset:0; display:flex; flex-direction:column; align-items:center; justify-content:center; color:#aaa; gap:4px; font-size:.9rem; }
.cs-preview-empty small { font-size:.75rem; }
.cs-term { border:1px solid var(--border); border-top:none; border-radius:0 0 10px 10px; background:rgba(0,0,0,.25); display:flex; flex-direction:column; min-height:100px; max-height:180px; }
.cs-term-out { flex:1; padding:8px 12px; font-family:'JetBrains Mono','Fira Code',monospace; font-size:.8rem; line-height:1.5; overflow-y:auto; color:var(--text); white-space:pre-wrap; }
.cs-term-muted { color:var(--muted); font-style:italic; }
.cs-term-in { display:flex; align-items:center; gap:6px; padding:6px 12px; border-top:1px solid var(--border); }
.cs-term-prompt { color:var(--neon-cyan); font-weight:700; font-size:.9rem; }
.cs-term-input { flex:1; background:transparent; border:none; color:var(--text); font-family:'JetBrains Mono','Fira Code',monospace; font-size:.8rem; outline:none; }
.cs-term-input::placeholder { color:var(--muted); font-style:italic; }

.tool-page:has(.cs) { padding:0; }
.tool-box:has(.cs) { padding:0; background:transparent; border:none; backdrop-filter:none; box-shadow:none; border-radius:0; }
body.cs-active .footer { display:none; }
body.cs-active .tool-page { padding:0; }
body.cs-active .tool-page .back { margin-bottom:4px; }
body.cs-active .tool-page h1, body.cs-active .tool-page .desc { display:none; }

@media(max-width:720px) { .cs-main:not(.cs-col) { flex-direction:column; } .cs-preview { border-left:none; border-top:1px solid var(--border); min-height:200px; } .cs-term { max-height:120px; } .cs { height:calc(100vh - 180px); } }


.modal-overlay {
  position: fixed; inset: 0; z-index: 999;
  background: rgba(2,2,5,.7);
  display: flex; align-items: center; justify-content: center;
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
}
.modal-panel {
  background: rgba(10,10,25,.92);
  border: 1px solid rgba(124,58,237,.2);
  border-radius: 16px;
  padding: 24px;
  max-width: 480px;
  width: 90%;
  box-shadow: 0 8px 48px rgba(0,0,0,.5), 0 0 40px rgba(124,58,237,.05);
}
.modal-header {
  display: flex; align-items: center; justify-content: space-between;
  margin-bottom: 20px;
}
.modal-header h3 { font-size: 1.2rem; color: var(--text-bright); }
.modal-close {
  width: 30px; height: 30px; border-radius: 6px;
  display: flex; align-items: center; justify-content: center;
  background: rgba(255,255,255,.04); border: 1px solid var(--border);
  color: var(--muted); cursor: pointer; font-size: 1rem;
  transition: all .15s;
}
.modal-close:hover { background: rgba(255,255,255,.08); color: var(--text); }
.modal-body label {
  font-size: .8rem; font-weight: 700; text-transform: uppercase;
  letter-spacing: .5px; color: var(--muted); margin-bottom: 8px; margin-top: 16px;
}
.modal-body label:first-child { margin-top: 0; }
.opt-group { display: flex; gap: 6px; flex-wrap: wrap; }
.opt-btn {
  padding: 7px 14px; border-radius: 8px;
  font-size: .8rem; font-weight: 600;
  background: rgba(255,255,255,.04); color: var(--text);
  border: 1px solid var(--border); cursor: pointer;
  transition: all .15s;
}
.opt-btn:hover { background: rgba(255,255,255,.07); }
.opt-btn.active {
  background: rgba(124,58,237,.15);
  color: #a78bfa;
  border-color: rgba(124,58,237,.3);
}
.modal-desc {
  font-size: .75rem; color: var(--muted);
  margin-top: 16px; text-align: center;
  line-height: 1.5;
}


input[type="range"] {
  -webkit-appearance: none; appearance: none;
  height: 6px; border-radius: 3px;
  background: rgba(124,58,237,.2);
  outline: none;
}
input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none; appearance: none;
  width: 16px; height: 16px; border-radius: 50%;
  background: var(--primary);
  cursor: pointer;
  box-shadow: 0 0 12px rgba(124,58,237,.3);
}
input[type="range"]::-moz-range-thumb {
  width: 16px; height: 16px; border-radius: 50%;
  background: var(--primary); cursor: pointer; border: none;
}