:root {
  --bg: #08080e;
  --panel: #0e0e18;
  --panel2: #13131f;
  --border: #1e1e30;
  --border2: #2a2a40;
  --accent: #7c6aff;
  --accent2: #ff6a6a;
  --text: #e0e0f0;
  --muted: #52526e;
  --green: #4dffa0;
  --amber: #ffcc44;
  --panel-w: 308px;
}
* { box-sizing: border-box; margin: 0; padding: 0; }
body {
  background: var(--bg);
  color: var(--text);
  font-family: 'Space Mono', monospace;
  height: 100vh;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  font-size: 12px;
}

/* ── HEADER ── */
header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 20px;
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
  gap: 12px;
}
.logo {
  font-family: 'Syne', sans-serif;
  font-weight: 800;
  font-size: 17px;
  letter-spacing: -0.02em;
  white-space: nowrap;
}
.logo span { color: var(--accent); }

/* Fractal type tabs */
.type-tabs {
  display: flex;
  gap: 4px;
  flex: 1;
  justify-content: center;
  flex-wrap: wrap;
}
.type-tab {
  background: transparent;
  border: 1px solid var(--border2);
  color: var(--muted);
  font-family: 'Space Mono', monospace;
  font-size: 10px;
  padding: 5px 10px;
  border-radius: 3px;
  cursor: pointer;
  transition: all 0.15s;
  white-space: nowrap;
}
.type-tab:hover { border-color: var(--accent); color: var(--text); }
.type-tab.active { border-color: var(--accent); color: var(--accent); background: rgba(124,106,255,0.12); }

.header-hint {
  font-size: 9px;
  color: var(--muted);
  white-space: nowrap;
  letter-spacing: 0.05em;
}

/* ── MAIN LAYOUT ── */
.main { display: flex; flex: 1; overflow: hidden; }

/* ── CANVAS ── */
.canvas-area {
  flex: 1;
  position: relative;
  background: #000;
  overflow: hidden;
  cursor: crosshair;
}
canvas#cv {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: contain;
  image-rendering: pixelated;
}
.zoom-box {
  position: absolute;
  border: 1px solid rgba(124,106,255,0.7);
  background: rgba(124,106,255,0.08);
  pointer-events: none;
  display: none;
}
.canvas-info {
  position: absolute;
  bottom: 10px;
  left: 12px;
  font-size: 9px;
  color: rgba(255,255,255,0.3);
  letter-spacing: 0.04em;
  pointer-events: none;
  line-height: 1.7;
}
.canvas-coords {
  position: absolute;
  top: 10px;
  left: 12px;
  font-size: 9px;
  color: rgba(255,255,255,0.25);
  pointer-events: none;
  font-family: 'Space Mono', monospace;
}
.zoom-hint {
  position: absolute;
  top: 10px;
  right: 12px;
  font-size: 9px;
  color: rgba(255,255,255,0.2);
  text-align: right;
  pointer-events: none;
  line-height: 1.7;
}
.progress-bar {
  position: absolute;
  bottom: 0; left: 0;
  height: 2px;
  background: var(--accent);
  width: 0%;
  transition: width 0.08s linear;
  z-index: 10;
}

/* ── PANEL ── */
.panel {
  width: var(--panel-w);
  background: var(--panel);
  border-left: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  overflow-y: auto;
  flex-shrink: 0;
}
.panel::-webkit-scrollbar { width: 3px; }
.panel::-webkit-scrollbar-thumb { background: var(--border2); border-radius: 2px; }

.section { border-bottom: 1px solid var(--border); padding: 14px; }

.sec-title {
  font-size: 8px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 12px;
  display: flex;
  align-items: center;
  gap: 8px;
}
.sec-title::after { content: ''; flex: 1; height: 1px; background: var(--border); }

/* Presets */
.presets-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 5px; }
.preset-btn {
  background: var(--panel2);
  border: 1px solid var(--border);
  color: var(--text);
  font-family: 'Space Mono', monospace;
  font-size: 9px;
  padding: 7px 6px;
  border-radius: 3px;
  cursor: pointer;
  transition: all 0.12s;
  text-align: left;
  line-height: 1.45;
}
.preset-btn:hover { border-color: var(--accent); color: var(--accent); background: rgba(124,106,255,0.08); }
.preset-btn.active { border-color: var(--accent); background: rgba(124,106,255,0.15); color: var(--accent); }
.preset-btn .pname { font-weight: 700; display: block; font-size: 10px; }
.preset-btn .psub { color: var(--muted); font-size: 8px; }

/* Fields */
.field { margin-bottom: 10px; }
.field label { font-size: 9px; color: var(--muted); letter-spacing: 0.05em; display: block; margin-bottom: 4px; }
.field input[type=text], .field select {
  width: 100%;
  background: var(--panel2);
  border: 1px solid var(--border);
  color: var(--text);
  font-family: 'Space Mono', monospace;
  font-size: 11px;
  padding: 6px 9px;
  border-radius: 3px;
  outline: none;
  transition: border-color 0.12s;
}
.field input[type=text]:focus, .field select:focus { border-color: var(--accent); }

.row2 { display: grid; grid-template-columns: 1fr 1fr; gap: 6px; margin-bottom: 10px; }
.row2 .field { margin-bottom: 0; }

/* Sliders */
.sl { display: flex; align-items: center; gap: 7px; margin-bottom: 9px; }
.sl label { font-size: 9px; color: var(--muted); width: 52px; flex-shrink: 0; }
.sl input[type=range] {
  flex: 1; -webkit-appearance: none;
  height: 2px; background: var(--border2); border-radius: 1px; outline: none;
}
.sl input[type=range]::-webkit-slider-thumb {
  -webkit-appearance: none; width: 11px; height: 11px;
  border-radius: 50%; background: var(--accent); cursor: pointer;
}
.sl .val { font-size: 9px; color: var(--text); min-width: 38px; text-align: right; }

/* Palette */
.pal-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 4px; }
.pal-sw {
  height: 24px; border-radius: 2px;
  border: 2px solid transparent; cursor: pointer;
  transition: border-color 0.12s, transform 0.1s;
}
.pal-sw:hover { transform: scale(1.1); }
.pal-sw.active { border-color: #fff; }
.pal-lbl { font-size: 8px; color: var(--muted); text-align: center; margin-top: 2px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }

/* Resolution */
.res-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 4px; }
.res-btn {
  background: var(--panel2); border: 1px solid var(--border);
  color: var(--muted); font-family: 'Space Mono', monospace;
  font-size: 9px; padding: 5px 2px;
  border-radius: 3px; cursor: pointer; text-align: center; transition: all 0.12s;
}
.res-btn:hover { border-color: var(--accent); color: var(--accent); }
.res-btn.active { border-color: var(--accent); color: var(--accent); background: rgba(124,106,255,0.15); }

/* Viewport */
.vp-row { display: flex; gap: 5px; margin-bottom: 8px; align-items: center; }
.vp-row label { font-size: 9px; color: var(--muted); width: 36px; flex-shrink: 0; }
.vp-row input[type=text] {
  flex: 1; background: var(--panel2); border: 1px solid var(--border);
  color: var(--text); font-family: 'Space Mono', monospace; font-size: 10px;
  padding: 4px 7px; border-radius: 3px; outline: none;
}
.vp-row input[type=text]:focus { border-color: var(--accent); }

/* Buttons */
.btn-render {
  width: 100%; padding: 11px;
  background: var(--accent); color: #fff; border: none;
  font-family: 'Syne', sans-serif; font-weight: 700;
  font-size: 13px; letter-spacing: 0.06em;
  border-radius: 3px; cursor: pointer;
  transition: opacity 0.15s, transform 0.1s;
}
.btn-render:hover { opacity: 0.85; }
.btn-render:active { transform: scale(0.98); }
.btn-render:disabled { opacity: 0.35; cursor: not-allowed; transform: none; }

.btn-sec {
  width: 100%; padding: 7px; margin-top: 5px;
  background: transparent; color: var(--muted);
  border: 1px solid var(--border);
  font-family: 'Space Mono', monospace; font-size: 10px;
  border-radius: 3px; cursor: pointer; transition: all 0.12s;
}
.btn-sec:hover { border-color: var(--green); color: var(--green); }

.btn-row { display: grid; grid-template-columns: 1fr 1fr; gap: 5px; margin-top: 5px; }
.btn-row .btn-sec { margin-top: 0; }

.status { font-size: 9px; color: var(--muted); text-align: center; margin-top: 7px; min-height: 14px; letter-spacing: 0.04em; }
.status.ok { color: var(--green); }
.status.err { color: var(--accent2); }

.info-box {
  display: flex; justify-content: space-between;
  font-size: 9px; color: var(--muted);
  margin-top: 6px; padding: 6px 8px;
  background: rgba(0,0,0,0.3); border-radius: 3px;
  font-family: 'Space Mono', monospace;
}
.info-box span { color: var(--text); }

/* Type-specific param panels */
.param-panel { display: none; }
.param-panel.active { display: block; }

/* Julia c picker */
.julia-c {
  display: flex; gap: 6px; align-items: center;
  margin-bottom: 10px;
}
.julia-c label { font-size: 9px; color: var(--muted); width: 14px; }
.julia-c input[type=text] {
  flex: 1; background: var(--panel2); border: 1px solid var(--border);
  color: var(--text); font-family: 'Space Mono', monospace; font-size: 10px;
  padding: 5px 7px; border-radius: 3px; outline: none;
}
.julia-c input:focus { border-color: var(--accent); }

/* Newton roots */
.roots-list { display: flex; flex-direction: column; gap: 5px; margin-bottom: 8px; }
.root-row { display: flex; gap: 5px; align-items: center; }
.root-row label { font-size: 9px; color: var(--muted); width: 18px; }
.root-row input {
  flex: 1; background: var(--panel2); border: 1px solid var(--border);
  color: var(--text); font-family: 'Space Mono', monospace; font-size: 10px;
  padding: 4px 6px; border-radius: 3px; outline: none;
}
.root-row input:focus { border-color: var(--accent); }

.tag { display: inline-block; font-size: 8px; padding: 2px 6px; border-radius: 2px; background: rgba(124,106,255,0.15); color: var(--accent); margin-left: 6px; vertical-align: middle; }

/* ── RESPONSIVE ── */
@media (max-width: 768px) {
  body { height: 100vh; height: 100dvh; }

  header { padding: 8px 12px; gap: 8px; }
  .logo { font-size: 14px; }
  .header-hint { display: none; }

  .type-tabs {
    flex: 1;
    flex-wrap: nowrap;
    overflow-x: auto;
    justify-content: flex-start;
    scrollbar-width: none;
    -webkit-overflow-scrolling: touch;
  }
  .type-tabs::-webkit-scrollbar { display: none; }
  .type-tab { font-size: 9px; padding: 5px 8px; }

  .main { flex-direction: column; }

  .canvas-area {
    flex: none;
    height: 50vh;
    height: 50dvh;
    touch-action: none;
  }

  .panel {
    width: 100%;
    flex: 1;
    min-height: 0;
    border-left: none;
    border-top: 1px solid var(--border);
    overflow-y: auto;
  }

  /* Larger touch targets */
  .preset-btn { min-height: 44px; }
  .btn-render { padding: 13px; font-size: 14px; }
  .btn-sec { padding: 10px; min-height: 40px; }
  .sl { margin-bottom: 12px; }
  .sl label { width: 58px; }
  .sl input[type=range] { height: 18px; }
  .sl input[type=range]::-webkit-slider-thumb { width: 22px; height: 22px; }
  .pal-sw { height: 32px; }
  .pal-grid { gap: 5px; }
  .field input[type=text], .field select { font-size: 13px; padding: 8px 10px; }
  .root-row input { font-size: 13px; padding: 7px 8px; }
  .vp-row input[type=text] { font-size: 12px; padding: 7px 9px; }
}

@media (max-width: 480px) {
  header { padding: 7px 10px; }
  .logo { font-size: 12px; }
  .type-tab { font-size: 8px; padding: 4px 7px; }
  .canvas-area { height: 45vh; height: 45dvh; }
  .section { padding: 10px; }
  .presets-grid { gap: 4px; }
}