@import url('https://fonts.googleapis.com/css2?family=Space+Grotesk:wght@500;600;700&family=Instrument+Sans:wght@400;500;600;700&family=JetBrains+Mono:wght@400;500;600&display=swap');

:root {
  --bg:      #05070d;
  --s0:      #080b13;
  --s1:      #0c0f18;
  --s2:      #111521;
  --s3:      #161b29;
  --s4:      #1c2233;
  --bd:      #1c2335;
  --bd2:     #2a334a;
  --acc:     #4f8ef7;
  --acc-l:   #6fa4ff;
  --acc-dim: rgba(79,142,247,.1);
  --cyn:     #67e8f9;
  --grn:     #34d399;
  --red:     #f45c6b;
  --org:     #f5a623;
  --vio:     #8b73f7;
  --txt:     #e4ecff;
  --txt2:    #8a98b8;
  --txt3:    #4a5775;
  --wall:    #4d6e90;
  --fmono:   'JetBrains Mono', monospace;
  --fsans:   'Instrument Sans', 'Space Grotesk', system-ui, sans-serif;
  --fdisp:   'Space Grotesk', 'Instrument Sans', system-ui, sans-serif;
  /* legacy aliases */
  --acc2: var(--vio);
  --mut:  var(--txt3);
  --dim:  #252e42;
}

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

html, body {
  height: 100%;
  overflow: hidden;
  font-family: var(--fsans);
  background: var(--bg);
  color: var(--txt);
  -webkit-font-smoothing: antialiased;
}

/* ── Layout ── */
.app {
  display: grid;
  grid-template-rows: 40px 1fr;
  grid-template-columns: 228px 1fr 204px;
  height: 100vh;
}

/* ── Topbar ── */
.tb {
  grid-column: 1 / -1;
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 0 14px;
  background: linear-gradient(180deg, #0a0d15 0%, #070a11 100%);
  border-bottom: 1px solid var(--bd);
  z-index: 10;
  overflow: hidden;
  position: relative;
}
.tb::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at 14% 50%, rgba(79,142,247,.07) 0%, transparent 40%);
  pointer-events: none;
}

/* ── Logo ── */
.logo {
  font-family: var(--fdisp);
  font-weight: 600;
  font-size: 12px;
  color: var(--txt2);
  letter-spacing: .02em;
  white-space: nowrap;
  display: flex;
  align-items: center;
  gap: 9px;
  position: relative;
  z-index: 1;
}
.logo-mark {
  width: 22px;
  height: 22px;
  border-radius: 6px;
  background: linear-gradient(135deg, var(--acc) 0%, var(--vio) 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  font-size: 11px;
  font-weight: 800;
  color: #fff;
  font-family: var(--fdisp);
  box-shadow: 0 0 0 1px rgba(255,255,255,.08), 0 4px 14px -2px rgba(79,142,247,.55);
  position: relative;
}
.logo-mark::after {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: 6px;
  background: linear-gradient(135deg, rgba(255,255,255,.22), transparent 50%);
  pointer-events: none;
}
.logo em { color: var(--txt); font-style: normal; font-weight: 700; letter-spacing: .04em; }

/* ── Floor tabs ── */
.ftabs {
  display: flex;
  gap: 2px;
  margin-left: 6px;
  padding: 2px;
  background: rgba(255,255,255,.02);
  border: 1px solid var(--bd);
  border-radius: 6px;
  position: relative;
  z-index: 1;
}
.ftab {
  padding: 0 10px;
  height: 22px;
  line-height: 22px;
  border-radius: 4px;
  cursor: pointer;
  font-size: 10px;
  font-weight: 600;
  font-family: var(--fmono);
  color: var(--txt3);
  border: 1px solid transparent;
  transition: all .14s cubic-bezier(.4,0,.2,1);
  letter-spacing: .06em;
}
.ftab:hover { color: var(--txt2); background: rgba(255,255,255,.03); }
.ftab.on    { color: var(--txt); background: linear-gradient(180deg, #1a2235 0%, #141a28 100%); border-color: var(--bd2); box-shadow: inset 0 1px 0 rgba(255,255,255,.04); }

.sep { width: 1px; height: 16px; background: var(--bd); margin: 0 2px; flex-shrink: 0; }

/* ── Topbar buttons ── */
.tbb {
  display: flex;
  align-items: center;
  gap: 5px;
  padding: 0 10px;
  height: 24px;
  border-radius: 5px;
  border: 1px solid var(--bd);
  background: rgba(255,255,255,.015);
  cursor: pointer;
  font-size: 10px;
  font-weight: 500;
  font-family: var(--fsans);
  color: var(--txt2);
  transition: all .14s cubic-bezier(.4,0,.2,1);
  white-space: nowrap;
  flex-shrink: 0;
  position: relative;
  z-index: 1;
}
.tbb:hover      { background: var(--s2); border-color: var(--bd2); color: var(--txt); transform: translateY(-.5px); }
.tbb:active     { transform: translateY(0); }
.tbb.prim       { background: linear-gradient(180deg, var(--acc-l) 0%, var(--acc) 100%); border-color: var(--acc); color: #fff; font-weight: 600; box-shadow: 0 4px 12px -3px rgba(79,142,247,.5), inset 0 1px 0 rgba(255,255,255,.18); }
.tbb.prim:hover { background: linear-gradient(180deg, #82b3ff 0%, var(--acc-l) 100%); border-color: var(--acc-l); }
.tbb.dng:hover  { border-color: var(--red); color: var(--red); background: rgba(244,92,107,.05); }
.tbb.v3d-3dbtn  { color: var(--cyn); border-color: rgba(103,232,249,.3); }
.tbb.v3d-3dbtn:hover { color: var(--cyn); border-color: var(--cyn); background: rgba(103,232,249,.08); }

.tbr { margin-left: auto; display: flex; gap: 5px; align-items: center; flex-shrink: 0; }

/* ── Badges ── */
.badge {
  padding: 2px 9px;
  border-radius: 10px;
  font-size: 9px;
  font-weight: 700;
  font-family: var(--fmono);
  letter-spacing: .6px;
  text-transform: uppercase;
}
.badge.g { background: rgba(52,211,153,.08);  color: var(--grn);  border: 1px solid rgba(52,211,153,.18); }
.badge.b { background: rgba(79,142,247,.08);  color: var(--acc);  border: 1px solid rgba(79,142,247,.18); }
.badge.r { background: rgba(244,92,107,.08);  color: var(--red);  border: 1px solid rgba(244,92,107,.18); }
.badge.v { background: rgba(139,115,247,.08); color: var(--vio);  border: 1px solid rgba(139,115,247,.18); }
.badge.o { background: rgba(245,166,35,.08);  color: var(--org);  border: 1px solid rgba(245,166,35,.18); }

/* ── Panels ── */
.lp, .rp {
  background: linear-gradient(180deg, var(--s1) 0%, var(--s0) 100%);
  display: flex;
  flex-direction: column;
  overflow: hidden;
  position: relative;
}
.lp { border-right: 1px solid var(--bd); }
.rp { border-left:  1px solid var(--bd); }
.lp::before, .rp::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at 50% 0%, rgba(79,142,247,.04) 0%, transparent 55%);
  pointer-events: none;
}

.ph {
  padding: 8px 12px;
  font-size: 8px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1.2px;
  color: var(--txt3);
  border-bottom: 1px solid var(--bd);
  font-family: var(--fmono);
  flex-shrink: 0;
}

.ps  { overflow-y: auto; flex: 1; padding: 8px; }
.tg  { font-size: 8px; color: var(--txt3); text-transform: uppercase; letter-spacing: .8px; margin-bottom: 6px; margin-top: 2px; font-family: var(--fmono); }
.dv  { height: 1px; background: var(--bd); margin: 8px 0; }

/* ── Tools grid ── */
.tool-grid { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 3px; margin-bottom: 10px; }
.t {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 3px;
  padding: 7px 4px;
  border-radius: 6px;
  border: 1px solid var(--bd);
  background: var(--s2);
  cursor: pointer;
  font-size: 9px;
  font-weight: 500;
  color: var(--txt3);
  transition: all .12s;
}
.t:hover { background: var(--s3); color: var(--txt2); }
.t.on    { border-color: var(--acc); color: var(--acc); background: rgba(79,142,247,.08); }
.t .ic   { font-size: 15px; line-height: 1; }

/* ── Inputs ── */
.ir { display: flex; flex-direction: column; gap: 3px; margin-bottom: 7px; }
.ir label { font-size: 9px; color: var(--txt3); font-family: var(--fmono); text-transform: uppercase; letter-spacing: .5px; }
.inp {
  width: 100%;
  padding: 5px 8px;
  background: var(--bg);
  border: 1px solid var(--bd);
  border-radius: 4px;
  color: var(--txt);
  font-size: 11px;
  font-family: var(--fmono);
  outline: none;
}
.inp:focus  { border-color: var(--acc); }
select.inp  { cursor: pointer; }

/* ── Panel buttons ── */
.bf {
  width: 100%;
  padding: 6px 10px;
  border-radius: 5px;
  border: none;
  cursor: pointer;
  font-size: 10px;
  font-weight: 600;
  font-family: var(--fsans);
  transition: opacity .12s;
  margin-bottom: 4px;
}
.bf:hover      { opacity: .82; }
.bf:last-child { margin-bottom: 0; }
.bf-g { background: var(--grn); color: #fff; }
.bf-b { background: var(--acc); color: #fff; }
.bf-s { background: var(--s2); color: var(--txt2); border: 1px solid var(--bd); }
.bf-r { background: rgba(244,92,107,.1); color: var(--red); border: 1px solid rgba(244,92,107,.2); }
.bf-v { background: rgba(139,115,247,.1); color: var(--vio); border: 1px solid rgba(139,115,247,.2); }

/* ── Stamps ── */
.stamp-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 4px; margin-bottom: 6px; }
.stamp {
  padding: 5px 4px;
  border-radius: 5px;
  border: 1px solid var(--bd);
  background: var(--s2);
  cursor: pointer;
  font-size: 9px;
  font-weight: 600;
  text-align: center;
  transition: all .12s;
  line-height: 1.3;
}
.stamp:hover { background: var(--s3); }
.stamp.on    { box-shadow: 0 0 0 1px currentColor; }

/* ── Canvas area ── */
.ca { position: relative; overflow: hidden; background: #080a0e; }
#cv { display: block; cursor: crosshair; }
.zi {
  position: absolute;
  bottom: 8px;
  right: 10px;
  font-family: var(--fmono);
  font-size: 9px;
  color: var(--txt3);
  background: var(--s1);
  border: 1px solid var(--bd);
  border-radius: 4px;
  padding: 3px 9px;
}
.hint {
  position: absolute;
  top: 8px;
  left: 50%;
  transform: translateX(-50%);
  font-size: 10px;
  color: var(--txt3);
  background: rgba(8,11,19,.85);
  border: 1px solid var(--bd);
  border-radius: 16px;
  padding: 4px 14px;
  font-family: var(--fmono);
  pointer-events: none;
  transition: opacity .3s;
  white-space: nowrap;
}

/* ── Right panel element list ── */
.si {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 4px 8px;
  border-radius: 4px;
  font-size: 10px;
  font-family: var(--fmono);
  cursor: pointer;
  margin-bottom: 2px;
}
.si:hover { background: var(--s2); }
.si.on    { background: var(--s2); outline: 1px solid var(--acc); }
.sn  { font-weight: 600; min-width: 26px; color: var(--acc); }
.sz  { font-size: 8px; padding: 1px 5px; border-radius: 6px; }
.su  { color: var(--txt3); font-size: 9px; }

/* ── Modals ── */
.mb {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,.75);
  z-index: 9000;
  align-items: center;
  justify-content: center;
}
.mb.on { display: flex; }
.md {
  background: var(--s1);
  border: 1px solid var(--bd);
  border-radius: 10px;
  padding: 20px;
  min-width: 320px;
  box-shadow: 0 24px 64px rgba(0,0,0,.8);
}
.mh   { font-size: 13px; font-weight: 600; margin-bottom: 12px; }
.mrow { display: flex; gap: 7px; margin-top: 12px; }
.mbtn { flex: 1; padding: 7px; border-radius: 5px; border: none; cursor: pointer; font-size: 11px; font-weight: 600; font-family: var(--fsans); }
.mok  { background: var(--acc); color: #fff; }
.mca  { background: var(--s2); color: var(--txt); border: 1px solid var(--bd); }

/* ── Notification toast ── */
#ntf {
  position: fixed;
  top: 50px;
  right: 12px;
  z-index: 9999;
  background: var(--s2);
  border: 1px solid var(--bd);
  border-left: 3px solid var(--grn);
  border-radius: 6px;
  padding: 5px 13px;
  font-size: 10px;
  font-family: var(--fmono);
  box-shadow: 0 8px 24px rgba(0,0,0,.7);
  transform: translateX(260px);
  transition: transform .28s cubic-bezier(.34,1.56,.64,1);
}
#ntf.on  { transform: translateX(0); }
#ntf.err { border-left-color: var(--red); }

/* ── Scrollbars ── */
::-webkit-scrollbar       { width: 3px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--bd); }

/* ── Zoning panel ── */
.zp-side { transition: width .22s ease, min-width .22s ease, opacity .22s ease; overflow: hidden; }
.zp-side.collapsed { width: 0 !important; min-width: 0 !important; opacity: 0; border: none !important; }

.zp-toggle {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  z-index: 10;
  width: 18px;
  height: 48px;
  border: 1px solid var(--bd);
  border-radius: 4px;
  background: var(--s2);
  color: var(--txt3);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 10px;
  font-weight: 700;
  transition: background .12s, color .12s;
  user-select: none;
}
.zp-toggle:hover  { background: var(--s3); color: var(--txt); }
.zp-toggle.left   { right: -9px; }
.zp-toggle.right  { left:  -9px; }

#zf-rdj.on, #zf-f00.on, #zf-f01.on, #zf-f03.on {
  background: rgba(30,35,50,.95) !important;
  box-shadow: 0 0 0 1px currentColor;
}

/* ── Fullscreen exit button ── */
#fsExitBtn {
  display: none;
  position: fixed;
  bottom: 16px;
  right: 16px;
  z-index: 9999;
  padding: 7px 16px;
  border-radius: 6px;
  border: 1px solid rgba(245,166,35,.4);
  background: rgba(5,7,13,.9);
  backdrop-filter: blur(8px);
  color: var(--org);
  font-size: 11px;
  font-weight: 600;
  font-family: var(--fsans);
  cursor: pointer;
  box-shadow: 0 4px 16px rgba(0,0,0,.6);
}
#fsExitBtn:hover { background: rgba(245,166,35,.15); }

input[type=file] { display: none; }

/* ════════════════════════════════════════════
   3D VIEWER PANEL
   ════════════════════════════════════════════ */
#viewer3dPanel {
  display: none;
  position: fixed;
  inset: 0;
  top: 40px;
  z-index: 500;
  grid-template-columns: 244px 1fr 268px;
  background: var(--bg);
  animation: fadeIn .3s cubic-bezier(.4,0,.2,1);
}
#viewer3dPanel.on { display: grid; }

@keyframes fadeIn { from { opacity: 0; } to { opacity: 1; } }

#v3d-canvas-wrap {
  position: relative;
  overflow: hidden;
  background: radial-gradient(ellipse at center, #0a0e18 0%, #04060a 100%);
}
#v3d-canvas-wrap::after {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse at 50% 100%, rgba(79,142,247,.06) 0%, transparent 60%);
  pointer-events: none;
  z-index: 2;
}
#v3d-canvas-wrap > canvas { position: relative; z-index: 1; }

#v3d-fl-pill {
  position: absolute;
  top: 10px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  align-items: center;
  gap: 3px;
  background: rgba(5,7,13,.88);
  border: 1px solid var(--bd);
  border-radius: 8px;
  padding: 3px 4px;
  z-index: 10;
  backdrop-filter: blur(12px);
}
.v3d-fl-btn {
  padding: 0 10px;
  height: 20px;
  line-height: 20px;
  border-radius: 5px;
  cursor: pointer;
  font-size: 9px;
  font-weight: 700;
  font-family: var(--fmono);
  color: var(--txt3);
  border: 1px solid transparent;
  transition: all .14s;
  letter-spacing: .06em;
}
.v3d-fl-btn:hover { color: var(--txt2); }
.v3d-fl-btn.on    { color: var(--txt); background: var(--s2); border-color: var(--bd2); box-shadow: inset 0 1px 0 rgba(255,255,255,.05); }
.v3d-fl-btn[data-fl="rdj"].on { color: var(--acc);  border-color: rgba(79,142,247,.5); }
.v3d-fl-btn[data-fl="f00"].on { color: var(--vio);  border-color: rgba(139,115,247,.5); }
.v3d-fl-btn[data-fl="f01"].on { color: var(--cyn);  border-color: rgba(103,232,249,.5); }
.v3d-fl-btn[data-fl="f03"].on { color: var(--grn);  border-color: rgba(52,211,153,.5); }

#v3d-toolbar {
  position: absolute;
  top: 10px;
  right: 12px;
  display: flex;
  gap: 5px;
  z-index: 10;
}
.v3d-iconbtn {
  width: 28px;
  height: 28px;
  border-radius: 6px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 13px;
  color: var(--txt3);
  background: rgba(5,7,13,.8);
  border: 1px solid var(--bd);
  cursor: pointer;
  transition: all .14s;
  backdrop-filter: blur(8px);
}
.v3d-iconbtn:hover { color: var(--txt); background: var(--s2); transform: translateY(-1px); }
.v3d-iconbtn.on    { color: var(--acc); border-color: rgba(79,142,247,.5); background: rgba(79,142,247,.12); }

#v3d-hint {
  position: absolute;
  bottom: 14px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  gap: 14px;
  background: rgba(5,7,13,.75);
  border: 1px solid var(--bd);
  border-radius: 20px;
  padding: 5px 18px;
  font-family: var(--fmono);
  font-size: 9px;
  color: var(--txt3);
  pointer-events: none;
  z-index: 10;
  backdrop-filter: blur(8px);
}
#v3d-hint kbd {
  display: inline-block;
  padding: 1px 5px;
  background: var(--s2);
  border: 1px solid var(--bd2);
  border-radius: 3px;
  font-size: 8px;
  color: var(--txt2);
  margin-right: 3px;
  font-family: var(--fmono);
}
#v3d-info {
  position: absolute;
  bottom: 14px;
  right: 14px;
  font-family: var(--fmono);
  font-size: 9px;
  color: var(--txt3);
  background: rgba(5,7,13,.75);
  border: 1px solid var(--bd);
  border-radius: 4px;
  padding: 3px 10px;
  backdrop-filter: blur(8px);
  z-index: 10;
}
#v3d-tooltip {
  position: absolute;
  z-index: 20;
  background: var(--s1);
  border: 1px solid var(--bd2);
  border-radius: 8px;
  padding: 10px 12px;
  min-width: 170px;
  font-size: 10px;
  font-family: var(--fmono);
  color: var(--txt2);
  pointer-events: none;
  opacity: 0;
  transition: opacity .12s;
  box-shadow: 0 8px 28px rgba(0,0,0,.7);
  line-height: 1.7;
}
#v3d-tooltip.on { opacity: 1; }

/* 3D sliders */
.v3d-slider-row  { display: flex; align-items: center; gap: 8px; margin: 6px 0; }
.v3d-slider-row label { font-size: 8.5px; font-family: var(--fmono); color: var(--txt3); text-transform: uppercase; letter-spacing: .08em; width: 56px; flex-shrink: 0; }
.v3d-slider {
  flex: 1;
  -webkit-appearance: none;
  height: 3px;
  border-radius: 2px;
  background: var(--bd2);
  outline: none;
}
.v3d-slider::-webkit-slider-thumb { -webkit-appearance: none; width: 14px; height: 14px; border-radius: 50%; background: var(--acc); cursor: pointer; box-shadow: 0 0 0 3px rgba(79,142,247,.15), 0 0 12px rgba(79,142,247,.5); transition: all .14s; }
.v3d-slider::-webkit-slider-thumb:hover { background: var(--acc-l); transform: scale(1.15); }
.v3d-val { font-family: var(--fmono); font-size: 9px; color: var(--acc); width: 38px; text-align: right; flex-shrink: 0; }

.v3d-palette-row { display: grid; grid-template-columns: repeat(3, 1fr); gap: 5px; }
.v3d-pal {
  height: 32px;
  border-radius: 6px;
  cursor: pointer;
  border: 2px solid transparent;
  transition: all .14s;
}
.v3d-pal:hover { transform: translateY(-1px); border-color: var(--bd2); }
.v3d-pal.on    { border-color: var(--acc); box-shadow: 0 0 0 1px var(--acc), 0 4px 12px -2px rgba(79,142,247,.4); }
.v3d-pal-midnight { background: linear-gradient(135deg, #05070d 0%, #1a2240 50%, #4f8ef7 100%); }
.v3d-pal-ice      { background: linear-gradient(135deg, #0a1018 0%, #1a3045 50%, #67e8f9 100%); }
.v3d-pal-warm     { background: linear-gradient(135deg, #0d0a08 0%, #3a2a18 50%, #fb923c 100%); }

.v3d-mat-row { display: grid; grid-template-columns: repeat(3, 1fr); gap: 4px; }
.v3d-mat {
  padding: 5px 4px;
  border-radius: 5px;
  font-size: 9px;
  font-weight: 600;
  text-align: center;
  cursor: pointer;
  border: 1px solid var(--bd);
  background: var(--s2);
  color: var(--txt3);
  transition: all .12s;
  font-family: var(--fsans);
}
.v3d-mat:hover { color: var(--txt2); border-color: var(--bd2); }
.v3d-mat.on    { color: var(--acc); border-color: rgba(79,142,247,.5); background: rgba(79,142,247,.1); }

.v3d-statcard {
  background: var(--s2);
  border: 1px solid var(--bd);
  border-radius: 8px;
  padding: 10px 12px;
  margin-bottom: 8px;
}
.v3d-statcard .lbl { font-size: 8px; color: var(--txt3); font-family: var(--fmono); text-transform: uppercase; letter-spacing: .12em; margin-bottom: 4px; }
.v3d-statcard .val { font-size: 22px; font-weight: 700; color: var(--txt); font-family: var(--fdisp); line-height: 1; }
.v3d-statcard .sub { font-size: 9.5px; color: var(--txt2); margin-top: 3px; font-family: var(--fmono); }

.v3d-actbar {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 5px 7px;
  border-radius: 5px;
  font-size: 9.5px;
  font-family: var(--fmono);
  transition: background .1s;
}
.v3d-actbar:hover { background: var(--s2); }
.v3d-actbar .sw   { width: 9px; height: 9px; border-radius: 2px; flex-shrink: 0; box-shadow: 0 0 8px currentColor; }
.v3d-actbar .ttl  { flex: 1; color: var(--txt2); }
.v3d-actbar .cnt  { color: var(--txt); font-weight: 700; }

#v3d-loader {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 14px;
  background: rgba(4,6,10,.85);
  z-index: 50;
  transition: opacity .4s;
}
#v3d-loader.gone { opacity: 0; pointer-events: none; }
.v3d-spinner {
  width: 38px;
  height: 38px;
  border: 2px solid var(--bd);
  border-top-color: var(--acc);
  border-radius: 50%;
  animation: spin .9s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }