@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600&family=JetBrains+Mono:wght@400;500&display=swap');

:root {
  --bg-panel: rgba(12, 12, 20, 0.92);
  --bg-hover: rgba(255, 255, 255, 0.06);
  --border: rgba(255, 255, 255, 0.08);
  --text: #e0e0e0;
  --text-dim: #888;
  --accent: #6c9fff;
  --accent-glow: rgba(108, 159, 255, 0.15);
  --green: #4ade80;
  --red: #f87171;
  --radius: 6px;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
body { overflow: hidden; background: #0a0a14; font-family: 'Inter', sans-serif; }
canvas { display: block; }

/* ---- Top bar ---- */
#topbar {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: 48px;
  background: var(--bg-panel);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 20px;
  z-index: 50;
  backdrop-filter: blur(20px);
}

#logo {
  font-size: 16px;
  font-weight: 500;
  letter-spacing: 0.5px;
  color: var(--text);
}
#logo span { color: var(--accent); }

#topbar-left {
  display: flex;
  gap: 8px;
  align-items: center;
  margin-left: 24px;
}

#topbar-actions {
  display: flex;
  gap: 8px;
  align-items: center;
}

/* ---- Buttons ---- */
.btn {
  background: rgba(255,255,255,0.05);
  color: var(--text);
  border: 1px solid var(--border);
  padding: 6px 14px;
  font: 13px 'Inter', sans-serif;
  border-radius: var(--radius);
  cursor: pointer;
  transition: all 0.15s;
}
.btn:hover { background: var(--bg-hover); border-color: rgba(255,255,255,0.15); }
.btn.active { background: var(--accent-glow); border-color: var(--accent); color: var(--accent); }
.btn.connected { background: rgba(74,222,128,0.1); border-color: var(--green); color: var(--green); }
.btn.danger { border-color: var(--red); color: var(--red); }

/* ---- Side panel (left) ---- */
#panel {
  position: fixed;
  top: 48px;
  left: 0;
  width: 280px;
  bottom: 36px;
  background: var(--bg-panel);
  border-right: 1px solid var(--border);
  backdrop-filter: blur(20px);
  z-index: 40;
  overflow-y: auto;
  transition: transform 0.25s ease;
}
#panel.collapsed { transform: translateX(-100%); }

.panel-section {
  padding: 16px;
  border-bottom: 1px solid var(--border);
}
.panel-section h3 {
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--text-dim);
  margin-bottom: 12px;
}

.panel-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 8px;
}
.panel-row:last-child { margin-bottom: 0; }
.panel-row label {
  font-size: 13px;
  color: var(--text);
}

/* ---- Inputs ---- */
select.ctrl, input[type="color"].ctrl, input[type="text"].ctrl {
  background: rgba(255,255,255,0.05);
  color: var(--text);
  border: 1px solid var(--border);
  padding: 5px 8px;
  font: 12px 'JetBrains Mono', monospace;
  border-radius: var(--radius);
  cursor: pointer;
}
select.ctrl:hover, input[type="color"].ctrl:hover, input[type="text"].ctrl:hover {
  border-color: rgba(255,255,255,0.2);
}
input[type="text"].ctrl {
  width: 120px;
}
input[type="color"].ctrl {
  width: 36px; height: 28px;
  padding: 2px;
}

/* Toggle switch */
.toggle {
  position: relative;
  width: 36px; height: 20px;
  background: rgba(255,255,255,0.1);
  border-radius: 10px;
  cursor: pointer;
  transition: background 0.2s;
}
.toggle.on { background: var(--accent); }
.toggle::after {
  content: '';
  position: absolute;
  top: 2px; left: 2px;
  width: 16px; height: 16px;
  background: white;
  border-radius: 50%;
  transition: transform 0.2s;
}
.toggle.on::after { transform: translateX(16px); }

/* ---- Bottom bar (telemetry) ---- */
#hud {
  position: fixed;
  bottom: 0; left: 0; right: 0;
  height: 36px;
  color: var(--green);
  font: 12px 'JetBrains Mono', monospace;
  background: var(--bg-panel);
  border-top: 1px solid var(--border);
  backdrop-filter: blur(20px);
  pointer-events: none;
  z-index: 50;
  white-space: nowrap;
  display: flex;
  align-items: center;
  padding: 0 16px;
  gap: 24px;
}
#hud .hud-section {
  display: flex;
  align-items: center;
  gap: 6px;
}
#hud .hud-label {
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--text-dim);
}
#hud .hud-sep {
  width: 1px;
  height: 18px;
  background: var(--border);
}
.research-flag {
  font-size: 9px;
  letter-spacing: 1px;
  text-transform: uppercase;
  color: var(--red);
  opacity: 0.8;
}

/* ---- Status indicator ---- */
.status-dot {
  width: 8px; height: 8px;
  border-radius: 50%;
  display: inline-block;
  margin-right: 6px;
}
.status-dot.off { background: var(--red); }
.status-dot.on { background: var(--green); box-shadow: 0 0 6px var(--green); }

/* ---- Drop overlay ---- */
#drop-overlay {
  position: fixed;
  inset: 0;
  background: rgba(10,10,20,0.95);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  z-index: 100;
  backdrop-filter: blur(10px);
}
#drop-overlay.hidden { display: none; }
#drop-overlay .drop-icon {
  width: 64px; height: 64px;
  border: 2px dashed var(--accent);
  border-radius: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 28px;
  color: var(--accent);
  margin-bottom: 16px;
}
#drop-overlay p {
  color: var(--text);
  font-size: 16px;
}
#drop-overlay .hint {
  color: var(--text-dim);
  font-size: 13px;
  margin-top: 8px;
}

/* ---- File input hidden ---- */
#file-input { display: none; }

/* ---- Dropdown ---- */
.dropdown {
  position: relative;
  display: inline-block;
}
.dropdown-menu {
  display: none;
  position: absolute;
  top: 100%;
  left: 0;
  margin-top: 4px;
  background: var(--bg-panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  backdrop-filter: blur(20px);
  min-width: 160px;
  z-index: 60;
  overflow: hidden;
}
.dropdown-menu.open { display: block; }
.dropdown-menu button {
  display: block;
  width: 100%;
  background: none;
  color: var(--text);
  border: none;
  padding: 8px 14px;
  font: 13px 'Inter', sans-serif;
  text-align: left;
  cursor: pointer;
  transition: background 0.15s;
}
.dropdown-menu button:hover { background: var(--bg-hover); }

/* ---- Scrollbar ---- */
#panel::-webkit-scrollbar { width: 4px; }
#panel::-webkit-scrollbar-thumb { background: rgba(255,255,255,0.1); border-radius: 2px; }

/* ---- CMM Mode ---- */
.cmm-btn-row { display: flex; gap: 6px; margin-bottom: 8px; }
.cmm-btn-row .btn { flex: 1; text-align: center; font-size: 12px; padding: 5px 8px; }
.cmm-point-list, .cmm-measure-list {
  font: 12px 'JetBrains Mono', monospace;
  color: var(--text-dim);
  margin-top: 8px;
  max-height: 150px;
  overflow-y: auto;
}

/* ---- Calibrate sliders ---- */
.cal-bone {
  margin-bottom: 10px;
  padding-bottom: 8px;
  border-bottom: 1px solid rgba(255,255,255,0.04);
}
.cal-bone-name {
  font: 500 11px 'JetBrains Mono', monospace;
  color: var(--accent);
  margin-bottom: 6px;
}
.cal-axis-row {
  display: flex;
  align-items: center;
  gap: 6px;
  margin-bottom: 4px;
}
.cal-axis-label {
  font: 11px 'JetBrains Mono', monospace;
  width: 14px;
  text-align: center;
}
.cal-axis-label.x { color: #ff4444; }
.cal-axis-label.y { color: #44ff44; }
.cal-axis-label.z { color: #4488ff; }
.cal-slider {
  flex: 1;
  accent-color: var(--accent);
  cursor: pointer;
  height: 4px;
}
.cal-value {
  font: 11px 'JetBrains Mono', monospace;
  color: var(--text);
  width: 52px;
  text-align: right;
  background: rgba(255,255,255,0.05);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 2px 4px;
}
.cal-value:focus {
  outline: none;
  border-color: var(--accent);
}

/* ---- ViewCube ---- */
#viewcube-container {
  position: fixed;
  bottom: 44px;
  right: 12px;
  width: 100px;
  height: 100px;
  z-index: 45;
  cursor: pointer;
  border-radius: 8px;
  overflow: hidden;
}
#viewcube-container canvas {
  display: block;
  width: 100% !important;
  height: 100% !important;
}

/* ---- Loading overlay ---- */
#loading-overlay {
  position: fixed;
  inset: 0;
  background: #0a0a14;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  z-index: 9999;
  transition: opacity 0.6s ease, visibility 0.6s ease;
}
#loading-overlay.fade-out {
  opacity: 0;
  visibility: hidden;
}

.loader-ring {
  position: relative;
  width: 200px;
  height: 200px;
}

.loader-ring svg {
  position: absolute;
  top: 0; left: 0;
  width: 100%;
  height: 100%;
}

/* Outer ring — slow spin */
.ring-outer {
  animation: spin-cw 3s linear infinite;
}
.ring-outer circle {
  fill: none;
  stroke: url(#grad-outer);
  stroke-width: 2;
  stroke-dasharray: 220 100;
  stroke-linecap: round;
}

/* Middle ring — reverse spin */
.ring-mid {
  animation: spin-ccw 2s linear infinite;
}
.ring-mid circle {
  fill: none;
  stroke: url(#grad-mid);
  stroke-width: 1.5;
  stroke-dasharray: 60 30 90 40;
  stroke-linecap: round;
}

/* Inner ring — fast spin */
.ring-inner {
  animation: spin-cw 1.2s linear infinite;
}
.ring-inner circle {
  fill: none;
  stroke: url(#grad-inner);
  stroke-width: 2.5;
  stroke-dasharray: 40 80;
  stroke-linecap: round;
}

/* Pulsing core dot */
.loader-core {
  position: absolute;
  top: 50%; left: 50%;
  transform: translate(-50%, -50%);
  width: 8px; height: 8px;
  background: #6c9fff;
  border-radius: 50%;
  box-shadow: 0 0 20px #6c9fff, 0 0 40px rgba(108,159,255,0.4), 0 0 80px rgba(108,159,255,0.15);
  animation: pulse-core 1.5s ease-in-out infinite;
}

/* Orbiting dots */
.orbit-dot {
  position: absolute;
  width: 4px; height: 4px;
  background: #4ade80;
  border-radius: 50%;
  top: 50%; left: 50%;
  box-shadow: 0 0 8px #4ade80;
}
.orbit-dot:nth-child(1) { animation: orbit 2.5s linear infinite; }
.orbit-dot:nth-child(2) { animation: orbit 2.5s linear infinite 0.83s; }
.orbit-dot:nth-child(3) { animation: orbit 2.5s linear infinite 1.66s; }

/* Scan line */
.scan-line {
  position: absolute;
  top: 50%; left: 50%;
  width: 100px; height: 1px;
  transform-origin: 0 0;
  background: linear-gradient(90deg, rgba(108,159,255,0.8), transparent);
  animation: scan-rotate 2s linear infinite;
}

.loader-text {
  margin-top: 32px;
  font: 500 13px 'Inter', sans-serif;
  letter-spacing: 3px;
  text-transform: uppercase;
  color: #6c9fff;
  animation: text-flicker 2s ease-in-out infinite;
}

.loader-sub {
  margin-top: 8px;
  font: 11px 'JetBrains Mono', monospace;
  color: #444;
  animation: text-flicker 2s ease-in-out infinite 0.5s;
}

@keyframes spin-cw { to { transform: rotate(360deg); } }
@keyframes spin-ccw { to { transform: rotate(-360deg); } }
@keyframes pulse-core {
  0%, 100% { transform: translate(-50%,-50%) scale(1); opacity: 1; }
  50% { transform: translate(-50%,-50%) scale(1.8); opacity: 0.6; }
}
@keyframes orbit {
  0% { transform: translate(-50%,-50%) rotate(0deg) translateX(80px) scale(1); opacity: 1; }
  50% { transform: translate(-50%,-50%) rotate(180deg) translateX(80px) scale(0.5); opacity: 0.4; }
  100% { transform: translate(-50%,-50%) rotate(360deg) translateX(80px) scale(1); opacity: 1; }
}
@keyframes scan-rotate {
  to { transform: rotate(360deg); }
}
@keyframes text-flicker {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.5; }
}

/* ---- Login screen ---- */
#login-screen {
  position: fixed;
  inset: 0;
  background: #0a0a14;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  z-index: 10000;
}
#login-screen.fade-out {
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.5s ease, visibility 0.5s ease;
}
.login-box {
  background: var(--bg-panel);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 40px 36px;
  width: 320px;
  backdrop-filter: blur(20px);
}
.login-logo {
  text-align: center;
  font-size: 22px;
  font-weight: 500;
  color: var(--text);
  margin-bottom: 8px;
}
.login-logo span { color: var(--accent); }
.login-sub {
  text-align: center;
  font-size: 12px;
  color: var(--text-dim);
  margin-bottom: 28px;
  letter-spacing: 2px;
  text-transform: uppercase;
}
.login-field {
  margin-bottom: 16px;
}
.login-field label {
  display: block;
  font-size: 11px;
  color: var(--text-dim);
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-bottom: 6px;
}
.login-field input {
  width: 100%;
  background: rgba(255,255,255,0.05);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 10px 12px;
  font: 14px 'JetBrains Mono', monospace;
  outline: none;
  transition: border-color 0.2s;
}
.login-field input:focus {
  border-color: var(--accent);
}
.login-field input::placeholder {
  color: rgba(255,255,255,0.15);
}
#login-btn {
  width: 100%;
  padding: 10px;
  background: var(--accent);
  color: #0a0a14;
  border: none;
  border-radius: var(--radius);
  font: 600 14px 'Inter', sans-serif;
  cursor: pointer;
  transition: opacity 0.2s;
  margin-top: 4px;
}
#login-btn:hover { opacity: 0.85; }
#login-error {
  color: var(--red);
  font-size: 12px;
  text-align: center;
  margin-top: 12px;
  display: none;
}

/* ===============================================================
   RESPONSIVE — Mobile (<768px)
   =============================================================== */
/* Mobile menu toggle button (hidden on desktop) */
#mobile-menu-btn {
  display: none;
}

@media (max-width: 768px) {
  /* Top bar: compact single row */
  #topbar {
    height: 40px;
    padding: 0 10px;
  }
  #logo {
    font-size: 13px;
  }

  /* Hide toolbar buttons, show hamburger */
  #topbar-left {
    display: none;
  }
  #topbar-actions {
    display: none;
  }
  #topbar.menu-open #topbar-left,
  #topbar.menu-open #topbar-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 4px;
    justify-content: center;
    width: 100%;
  }
  #topbar.menu-open {
    height: auto;
    flex-wrap: wrap;
    padding: 8px 10px;
    gap: 6px;
  }
  #mobile-menu-btn {
    display: block;
    background: none;
    border: 1px solid var(--border);
    color: var(--text);
    font-size: 18px;
    padding: 4px 10px;
    border-radius: var(--radius);
    cursor: pointer;
    line-height: 1;
  }

  .btn {
    padding: 5px 8px;
    font-size: 10px;
  }

  /* Panel: full width overlay, collapsed by default */
  #panel {
    width: 100%;
    top: 0;
    bottom: 0;
    z-index: 55;
    transform: translateX(-100%);
  }
  #panel:not(.collapsed) {
    transform: translateX(0);
  }

  /* HUD: single line, hide non-essential */
  #hud {
    height: 24px;
    padding: 0 8px;
    gap: 8px;
    font-size: 9px;
    overflow: hidden;
  }
  .research-flag {
    font-size: 7px;
    letter-spacing: 0.5px;
  }

  /* ViewCube: smaller */
  #viewcube-container {
    width: 60px;
    height: 60px;
    bottom: 30px;
    right: 6px;
  }

  /* Login: responsive */
  .login-box {
    width: 90vw;
    max-width: 320px;
    padding: 28px 24px;
  }

  .dropdown-menu {
    min-width: 140px;
  }
}

@media (max-width: 480px) {
  #logo { font-size: 12px; }
  #viewcube-container { width: 50px; height: 50px; }
  .login-logo { font-size: 18px; }
}