@import url('https://fonts.googleapis.com/css2?family=JetBrains+Mono:wght@400;500;600;700&family=DM+Sans:opsz,wght@9..40,400;9..40,500;9..40,600;9..40,700&display=swap');

:root {
  --accent: #44ffd2;
  --accent-dim: rgba(68,255,210,0.12);
  --accent-glow: rgba(68,255,210,0.25);
  --accent-bright: #72ffdf;
  --logi-accent: #4fc3f7;
  --logi-dim: rgba(79,195,247,0.12);
  --razer-accent: #44ffd2;
  --razer-dim: rgba(68,255,210,0.12);
  --danger: #ff5252;
  --danger-dim: rgba(255,82,82,0.12);
  --warning: #ffc107;
  --success: #69f0ae;
  --s0: #0c0e14; --s1: #11141c; --s2: #171b26; --s3: #1d2230;
  --b0: rgba(255,255,255,0.05);
  --b1: rgba(255,255,255,0.08);
  --t0: #f0f2f5; --t1: #b0b8c8; --t2: #6b7890; --t3: #3d4860;
  --mono: 'JetBrains Mono','SF Mono','Fira Code',monospace;
  --sans: 'DM Sans',-apple-system,system-ui,sans-serif;
  --r: 10px; --rs: 6px; --rx: 4px;
  --ease: cubic-bezier(.16,1,.3,1);
}

*,*::before,*::after { margin:0; padding:0; box-sizing:border-box; }

body {
  font-family: var(--sans);
  background: var(--s0);
  color: var(--t0);
  min-height: 100vh;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

body::before {
  content:''; position:fixed; inset:0;
  background: repeating-linear-gradient(0deg,transparent,transparent 2px,rgba(255,255,255,.006) 2px,rgba(255,255,255,.006) 4px);
  pointer-events:none; z-index:9999;
}

::-webkit-scrollbar { width:4px; }
::-webkit-scrollbar-track { background:transparent; }
::-webkit-scrollbar-thumb { background:var(--t3); border-radius:2px; }

/* --- Shell & Layout --- */
.shell { max-width: 1200px; margin: 0 auto; padding: 16px 20px 32px; }

.header {
  text-align: center; padding: 18px 0 14px; position: relative;
}
.lang-toggle {
  position: absolute; top: 12px; right: 0;
  font-family: var(--mono); font-size: .7em; font-weight: 700;
  color: var(--t2); background: var(--s2); border: 1px solid var(--b1);
  border-radius: var(--rx); padding: 4px 12px;
  cursor: pointer; letter-spacing: .04em;
  transition: all .2s var(--ease); line-height: 1;
}
.lang-toggle:hover { border-color: var(--accent); color: var(--accent); }
.header h1 {
  font-family: var(--mono); font-size: 1.3em; font-weight: 700;
  color: var(--accent); letter-spacing: .08em; text-transform: uppercase;
  text-shadow: 0 0 24px var(--accent-glow);
}
.header .subtitle {
  font-family: var(--mono); font-size: .68em; color: var(--t3);
  letter-spacing: .12em; text-transform: uppercase;
}

.layout {
  display: grid;
  grid-template-columns: 340px 1fr;
  gap: 14px;
  align-items: start;
}

.col-left, .col-right {
  display: flex; flex-direction: column; gap: 12px;
}

/* --- Card --- */
.card {
  background: var(--s1); border: 1px solid var(--b0);
  border-radius: var(--r); padding: 16px 18px;
  position: relative;
  transition: border-color .3s var(--ease);
}
.card:hover { border-color: var(--b1); }
.card h2 {
  font-family: var(--mono); font-size: .72em; font-weight: 600;
  color: var(--t2); letter-spacing: .1em; text-transform: uppercase;
  margin-bottom: 12px; padding-bottom: 8px; border-bottom: 1px solid var(--b0);
}

/* --- Buttons --- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 4px;
  font-family: var(--mono); font-size: .76em; font-weight: 600;
  letter-spacing: .04em; text-transform: uppercase;
  color: var(--s0); background: var(--accent); border: none;
  padding: 8px 16px; border-radius: var(--rs);
  cursor: pointer; transition: all .18s var(--ease);
  user-select: none; line-height: 1; position: relative;
}
.btn:hover { background: var(--accent-bright); box-shadow: 0 0 16px var(--accent-glow); transform: translateY(-1px); }
.btn:active { transform: translateY(0); }
.btn:disabled { opacity: .25; cursor: not-allowed; transform: none; box-shadow: none; }
.btn-danger { background: var(--danger); }
.btn-danger:hover { background: #ff6e6e; box-shadow: 0 0 16px rgba(255,82,82,.2); }
.btn-secondary { background: transparent; color: var(--t1); border: 1px solid var(--b1); }
.btn-secondary:hover { border-color: var(--accent); color: var(--accent); background: var(--accent-dim); box-shadow: none; }
.btn-sm { padding: 6px 12px; font-size: .7em; }
.btn-block { flex: 1; }
.btn-group { display: flex; gap: 6px; }

/* --- Status --- */
.status-dot {
  width: 8px; height: 8px; border-radius: 50%; background: var(--danger);
  flex-shrink: 0; transition: all .4s var(--ease);
}
.status-dot.connected {
  background: var(--success);
  box-shadow: 0 0 8px rgba(105,240,174,.4);
  animation: pulse 2s ease-in-out infinite;
}
@keyframes pulse {
  0%,100% { box-shadow: 0 0 8px rgba(105,240,174,.4); }
  50% { box-shadow: 0 0 14px rgba(105,240,174,.6); }
}
.status-row { display: flex; align-items: center; gap: 8px; margin-bottom: 10px; }
.status-text { font-family: var(--mono); font-size: .78em; color: var(--t2); }

/* --- Device Info --- */
.device-info { display: grid; grid-template-columns: 1fr 1fr; gap: 6px; }
.info-item {
  display: flex; flex-direction: column; gap: 1px;
  padding: 6px 8px; background: var(--s2); border-radius: var(--rx); border: 1px solid var(--b0);
}
.info-item label { font-family: var(--mono); font-size: .58em; color: var(--t3); text-transform: uppercase; letter-spacing: .1em; }
.info-item span { font-family: var(--mono); font-size: .78em; color: var(--t0); font-weight: 500; }

.brand-badge {
  display: inline-flex; padding: 2px 8px; border-radius: 999px;
  font-family: var(--mono); font-size: .65em; font-weight: 700;
  letter-spacing: .06em; text-transform: uppercase;
}
.brand-badge.logitech { background: var(--logi-dim); color: var(--logi-accent); border: 1px solid rgba(79,195,247,.2); }
.brand-badge.razer { background: var(--razer-dim); color: var(--razer-accent); border: 1px solid rgba(68,255,210,.2); }

/* --- Profile Cards --- */
.profile-cards {
  display: flex; gap: 8px; overflow-x: auto; padding: 2px 0;
  scrollbar-width: none;
}
.profile-cards::-webkit-scrollbar { display: none; }
.profile-empty { font-family: var(--mono); font-size: .72em; color: var(--t3); text-align: center; padding: 12px; width: 100%; }

.pcard {
  flex: 0 0 auto; width: 130px; min-height: 72px;
  background: var(--s2); border: 1px solid var(--b0); border-radius: var(--r);
  padding: 10px 10px 8px; cursor: pointer; position: relative;
  transition: all .2s var(--ease);
  display: flex; flex-direction: column; justify-content: space-between; gap: 6px;
  user-select: none;
}
.pcard:hover { border-color: var(--t3); background: var(--s3); transform: translateY(-2px); box-shadow: 0 4px 14px rgba(0,0,0,.3); }
.pcard-active { border-color: var(--accent); background: var(--accent-dim); }
.pcard-active:hover { border-color: var(--accent-bright); }

.pcard-indicator { position: absolute; top: 0; left: 14px; right: 14px; height: 2px; background: var(--accent); border-radius: 0 0 2px 2px; box-shadow: 0 0 8px var(--accent-glow); }

.pcard-name { font-family: var(--mono); font-size: .76em; font-weight: 700; color: var(--t0); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.pcard-active .pcard-name { color: var(--accent); }
.pcard-stats { display: flex; flex-wrap: wrap; gap: 3px; }
.pcard-tag { font-family: var(--mono); font-size: .58em; font-weight: 600; color: var(--t2); background: rgba(255,255,255,.03); padding: 1px 5px; border-radius: var(--rx); }
.pcard-active .pcard-tag { color: var(--accent); background: rgba(68,255,210,.06); }
.pcard-del { position: absolute; top: 3px; right: 3px; width: 16px; height: 16px; border: none; background: transparent; color: var(--t3); font-size: 12px; cursor: pointer; display: flex; align-items: center; justify-content: center; border-radius: 50%; opacity: 0; transition: all .15s; line-height: 1; }
.pcard:hover .pcard-del { opacity: 1; }
.pcard-del:hover { background: var(--danger-dim); color: var(--danger); }
.pcard-rename-input { font-family: var(--mono); font-size: .76em; font-weight: 700; color: var(--accent); background: var(--s0); border: 1px solid var(--accent); border-radius: var(--rx); padding: 1px 4px; width: 100%; outline: none; }

/* --- DPI --- */
.dpi-grid { display: grid; grid-template-columns: repeat(5,1fr); gap: 5px; }
.dpi-btn {
  font-family: var(--mono); font-size: .85em; font-weight: 700;
  color: var(--t1); background: var(--s2); border: 1px solid var(--b0);
  border-radius: var(--rs); padding: 12px 6px; cursor: pointer; text-align: center;
  transition: all .2s var(--ease); position: relative;
}
.dpi-btn:hover { border-color: var(--accent); color: var(--t0); }
.dpi-btn.active { border-color: var(--accent); color: var(--accent); background: var(--accent-dim); box-shadow: inset 0 0 10px var(--accent-dim); }
.dpi-btn.active::after { content:''; position:absolute; bottom:0; left:18%; right:18%; height:2px; background:var(--accent); border-radius:1px; }

/* --- Polling --- */
.polling-grid { display: grid; grid-template-columns: repeat(4,1fr); gap: 5px; }
.polling-btn {
  font-family: var(--mono); font-size: .78em; font-weight: 600;
  color: var(--t1); background: var(--s2); border: 1px solid var(--b0);
  border-radius: var(--rs); padding: 10px 6px; cursor: pointer; text-align: center;
  transition: all .2s var(--ease);
}
.polling-btn:hover { border-color: var(--accent); color: var(--t0); }
.polling-btn.active { border-color: var(--accent); color: var(--accent); background: var(--accent-dim); }
.polling-btn:disabled { opacity: .2; cursor: not-allowed; }

/* --- Slider --- */
.slider { -webkit-appearance: none; appearance: none; width: 100%; height: 4px; background: var(--s3); border-radius: 2px; outline: none; }
.slider::-webkit-slider-thumb { -webkit-appearance: none; width: 14px; height: 14px; border-radius: 50%; background: var(--accent); cursor: pointer; border: 2px solid var(--s0); box-shadow: 0 0 8px var(--accent-glow); transition: transform .15s; }
.slider::-webkit-slider-thumb:hover { transform: scale(1.2); }
.slider::-moz-range-thumb { width: 14px; height: 14px; border-radius: 50%; background: var(--accent); cursor: pointer; border: 2px solid var(--s0); }

/* --- Input --- */
.input-field {
  font-family: var(--mono); font-size: .82em;
  background: var(--s2); border: 1px solid var(--b0); border-radius: var(--rs);
  padding: 7px 10px; color: var(--t0); width: 100%;
  transition: border-color .2s;
}
.input-field:focus { border-color: var(--accent); outline: none; box-shadow: 0 0 0 2px var(--accent-dim); }
.input-field::placeholder { color: var(--t3); }

/* --- Toggle --- */
.checkbox-group { display: flex; align-items: center; gap: 8px; }
.checkbox-group label { cursor: pointer; color: var(--t1); font-size: .85em; }
.toggle { position: relative; display: inline-block; width: 32px; height: 18px; }
.toggle input { opacity: 0; width: 0; height: 0; }
.toggle-slider { position: absolute; cursor: pointer; inset: 0; background: var(--s3); border-radius: 9px; border: 1px solid var(--b0); transition: all .25s var(--ease); }
.toggle-slider::before { content:''; position: absolute; left: 2px; top: 2px; width: 12px; height: 12px; border-radius: 50%; background: var(--t2); transition: all .25s; }
.toggle input:checked+.toggle-slider { background: var(--accent-dim); border-color: var(--accent); }
.toggle input:checked+.toggle-slider::before { transform: translateX(14px); background: var(--accent); }

/* --- Battery Ring --- */
.battery-row { display: flex; align-items: center; gap: 16px; }
.battery-ring {
  position: relative; width: 72px; height: 72px; flex-shrink: 0;
}
.battery-ring svg { width: 100%; height: 100%; transform: rotate(-90deg); }
.battery-ring-bg { fill: none; stroke: var(--s3); stroke-width: 5; }
.battery-ring-fill {
  fill: none; stroke: var(--success); stroke-width: 5;
  stroke-dasharray: 213.6; stroke-dashoffset: 213.6;
  stroke-linecap: round;
  transition: stroke-dashoffset .8s var(--ease), stroke .4s;
}
.battery-ring-fill.low { stroke: var(--danger); }
.battery-ring-fill.medium { stroke: var(--warning); }
.battery-ring-text {
  position: absolute; inset: 0;
  display: flex; align-items: center; justify-content: center;
  font-family: var(--mono); font-size: 1em; font-weight: 700; color: var(--success);
}
.battery-meta { flex: 1; min-width: 0; }
.battery-bar-container { background: var(--s3); border-radius: var(--rx); height: 10px; overflow: hidden; border: 1px solid var(--b0); }
.battery-bar { height: 100%; border-radius: var(--rx); transition: width .6s var(--ease); background: linear-gradient(90deg,var(--success),#b9f6ca); }
.battery-bar.low { background: linear-gradient(90deg,var(--danger),#ff8a80); }
.battery-bar.medium { background: linear-gradient(90deg,var(--warning),#ffe082); }

/* --- Rotation --- */
.rotation-control { display: flex; align-items: center; gap: 10px; }
.rotation-value { font-family: var(--mono); font-size: 1.4em; font-weight: 700; color: var(--accent); min-width: 60px; text-align: center; }
.rotation-btn { width: 34px; height: 34px; border-radius: 50%; border: 1px solid var(--b1); background: var(--s2); color: var(--t1); font-size: 1.1em; cursor: pointer; display: flex; align-items: center; justify-content: center; font-family: var(--mono); transition: all .2s var(--ease); }
.rotation-btn:hover { border-color: var(--accent); color: var(--accent); background: var(--accent-dim); }

/* --- Console --- */
.console {
  background: var(--s0); border: 1px solid var(--b0); border-radius: var(--rs);
  padding: 8px 10px; max-height: 260px; overflow-y: auto;
  font-family: var(--mono); font-size: .68em; line-height: 1.6;
}
.console-line { padding: 1px 0; word-break: break-all; }
.console-line.info { color: var(--t2); }
.console-line.success { color: var(--success); }
.console-line.error { color: var(--danger); }
.console-line.send { color: var(--accent); }
.console-line.receive { color: var(--logi-accent); }
.console-line .time { color: var(--t3); margin-right: 5px; }

/* --- Misc --- */
.section-divider { height: 1px; background: var(--b0); margin: 10px 0; }
.info-msg { display: none; font-family: var(--mono); font-size: .72em; padding: 6px 10px; background: var(--accent-dim); border: 1px solid rgba(68,255,210,.12); border-radius: var(--rs); color: var(--accent); }
.info-msg.visible { display: block; }
.footer { text-align: center; padding: 20px 0 4px; font-family: var(--mono); font-size: .64em; color: var(--t3); letter-spacing: .06em; }
.footer-stats { margin-top: 6px; font-size: 1em; color: var(--t3); display: flex; justify-content: center; gap: 6px; align-items: center; }
.footer-stats strong { color: var(--accent); font-weight: 600; }
.footer-sep { opacity: .3; }

/* --- Utilities --- */
.mt-10 { margin-top: 10px; }
.mt-15 { margin-top: 15px; }
.mb-8 { margin-bottom: 8px; }
.mb-10 { margin-bottom: 10px; }
.mb-15 { margin-bottom: 15px; }
.text-secondary { color: var(--t2); }
.text-success { color: var(--success); }
.flex { display: flex; }
.flex-between { display: flex; justify-content: space-between; align-items: center; }
.gap-6 { gap: 6px; }
.gap-10 { gap: 10px; }
.hidden { display: none; }

/* --- Mouse Test Area --- */
.test-area {
  position: relative;
  width: 100%; height: 200px;
  background: var(--s0);
  border: 1px solid var(--b1);
  border-radius: var(--rs);
  overflow: hidden;
  cursor: crosshair;
  background-image:
    radial-gradient(circle, rgba(68,255,210,0.03) 1px, transparent 1px);
  background-size: 20px 20px;
}

.test-crosshair {
  position: absolute; width: 20px; height: 20px;
  pointer-events: none; opacity: 0;
  transform: translate(-50%, -50%);
  transition: opacity 0.15s;
}

.test-crosshair::before,
.test-crosshair::after {
  content: ''; position: absolute; background: var(--accent);
}

.test-crosshair::before {
  width: 1px; height: 100%; left: 50%; top: 0;
}

.test-crosshair::after {
  width: 100%; height: 1px; top: 50%; left: 0;
}

.test-dot {
  position: absolute; width: 4px; height: 4px;
  background: var(--accent);
  border-radius: 50%;
  transform: translate(-50%, -50%);
  pointer-events: none;
  box-shadow: 0 0 4px var(--accent-glow);
}

.hz-chart {
  margin-top: 8px;
  background: var(--s0);
  border: 1px solid var(--b0);
  border-radius: var(--rx);
  overflow: hidden;
  height: 36px;
}
.hz-chart canvas { width: 100%; height: 36px; display: block; }

.test-stats {
  display: grid; grid-template-columns: repeat(3, 1fr);
  gap: 5px; margin-top: 8px;
}

.test-stat {
  background: var(--s2); border: 1px solid var(--b0);
  border-radius: var(--rx); padding: 6px 8px;
  text-align: center;
  transition: border-color .3s var(--ease);
}

.test-stat.stat-primary {
  grid-column: span 3;
  padding: 10px 8px;
  border-color: var(--b1);
}

.stat-primary .test-value {
  font-size: 1.6em;
}

.stat-primary .test-label {
  font-size: .6em; margin-bottom: 4px;
}

.test-label {
  display: block;
  font-family: var(--mono); font-size: .52em;
  color: var(--t3); text-transform: uppercase;
  letter-spacing: .08em; margin-bottom: 1px;
}

.test-value {
  font-family: var(--mono); font-size: .88em;
  font-weight: 700; color: var(--accent);
}

.test-unit {
  font-family: var(--mono); font-size: .5em;
  color: var(--t3); margin-left: 1px;
}

/* --- QR Card --- */
.qr-card { padding: 16px; }
.qr-layout { display: flex; gap: 14px; align-items: center; }
.qr-img {
  width: 88px; height: 88px; border-radius: var(--r);
  border: 1px solid var(--b1); flex-shrink: 0;
}
.qr-text { min-width: 0; }
.qr-title {
  font-family: var(--mono); font-size: .78em; font-weight: 700;
  color: var(--accent); margin-bottom: 4px;
}
.qr-desc {
  font-size: .78em; color: var(--t1); line-height: 1.5; margin-bottom: 6px;
}
.qr-hint {
  font-family: var(--mono); font-size: .62em; color: var(--t3);
  letter-spacing: .04em;
}

/* --- Animations --- */
@keyframes fadeUp { from { opacity:0; transform:translateY(8px); } to { opacity:1; transform:translateY(0); } }
.col-left .card:nth-child(1) { animation: fadeUp .5s var(--ease) both; }
.col-left .card:nth-child(2) { animation: fadeUp .5s var(--ease) .06s both; }
.col-left .card:nth-child(3) { animation: fadeUp .5s var(--ease) .12s both; }
.col-left .card:nth-child(4) { animation: fadeUp .5s var(--ease) .18s both; }
.col-right .card:nth-child(1) { animation: fadeUp .5s var(--ease) .04s both; }
.col-right .card:nth-child(2) { animation: fadeUp .5s var(--ease) .10s both; }
.col-right .card:nth-child(3) { animation: fadeUp .5s var(--ease) .16s both; }

/* --- Responsive: stack on narrow --- */
@media (max-width: 780px) {
  .layout { grid-template-columns: 1fr; }
  .shell { padding: 10px 10px 24px; }
  .header h1 { font-size: 1.1em; }
  .dpi-grid { grid-template-columns: repeat(5,1fr); }
  .polling-grid { grid-template-columns: repeat(4,1fr); }
}

@media (max-width: 480px) {
  .dpi-grid { grid-template-columns: repeat(3,1fr); }
  .polling-grid { grid-template-columns: repeat(3,1fr); }
  .btn-group { flex-direction: column; }
  .btn-block { width: 100%; }
  .battery-ring { width: 56px; height: 56px; }
  .battery-ring-text { font-size: .85em; }
}