/* ═══════════════════════════════════════════════════════
   CHAOS LAB — Strange Attractor Explorer
   Aesthetic: Brutalist Observatory Terminal
   ═══════════════════════════════════════════════════════ */

/* ── STRUCTURAL TOKENS ── */
:root {
  --space-xs: 4px;
  --space-sm: 8px;
  --space-md: 14px;
  --space-lg: 20px;
  --space-xl: 28px;
  --radius-sm: 3px;
  --radius-md: 6px;
  --font-mono: "JetBrains Mono", "Space Mono", "Fira Code", monospace;
  --font-size-xs: 0.65rem;
  --font-size-sm: 0.75rem;
  --font-size-base: 0.85rem;
  --font-size-lg: 1rem;
  --font-size-xl: 1.5rem;
  --font-size-hero: 2.8rem;
  --panel-width: 300px;
}

/* ── THEME: Terminal (default) ── */
:root,
[data-theme="terminal"] {
  --void: #0a0f0a;
  --void-warm: #0e140e;
  --surface: rgba(12, 18, 12, 0.88);
  --ink: #c2d4be;
  --ink-muted: #6b8065;
  --ink-dim: #344032;
  --signal: #2e9025;
  --signal-glow: rgba(46, 144, 37, 0.25);
  --signal-dim: rgba(46, 144, 37, 0.1);
  --hot: #ff2d55;
  --amber: #a8b820;
}

/* ── THEME: Dracula ── */
[data-theme="dracula"] {
  --void: #282a36;
  --void-warm: #2d2f3d;
  --surface: rgba(40, 42, 54, 0.9);
  --ink: #f8f8f2;
  --ink-muted: #6272a4;
  --ink-dim: #44475a;
  --signal: #bd93f9;
  --signal-glow: rgba(189, 147, 249, 0.25);
  --signal-dim: rgba(189, 147, 249, 0.1);
  --hot: #ff5555;
  --amber: #f1fa8c;
}

/* ── THEME: Nord ── */
[data-theme="nord"] {
  --void: #2e3440;
  --void-warm: #3b4252;
  --surface: rgba(46, 52, 64, 0.9);
  --ink: #eceff4;
  --ink-muted: #7b88a1;
  --ink-dim: #434c5e;
  --signal: #88c0d0;
  --signal-glow: rgba(136, 192, 208, 0.25);
  --signal-dim: rgba(136, 192, 208, 0.1);
  --hot: #bf616a;
  --amber: #ebcb8b;
}

/* ── THEME: Solarized Light ── */
[data-theme="solarized"] {
  --void: #fdf6e3;
  --void-warm: #eee8d5;
  --surface: rgba(238, 232, 213, 0.94);
  --ink: #586e75;
  --ink-muted: #93a1a1;
  --ink-dim: #d3cbb7;
  --signal: #268bd2;
  --signal-glow: rgba(38, 139, 210, 0.2);
  --signal-dim: rgba(38, 139, 210, 0.08);
  --hot: #dc322f;
  --amber: #b58900;
}

/* ── THEME: Paper ── */
[data-theme="paper"] {
  --void: #fafaf8;
  --void-warm: #f0f0ec;
  --surface: rgba(255, 255, 255, 0.94);
  --ink: #2c2c2c;
  --ink-muted: #888888;
  --ink-dim: #d4d4d4;
  --signal: #d14d41;
  --signal-glow: rgba(209, 77, 65, 0.2);
  --signal-dim: rgba(209, 77, 65, 0.08);
  --hot: #d14d41;
  --amber: #da8b17;
}

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

/* ── BASE ── */
html,
body {
  width: 100%;
  height: 100%;
  overflow: hidden;
  background: var(--void);
  font-family: var(--font-mono);
  color: var(--ink);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* ── CANVAS — fullscreen, behind everything ── */
#canvas {
  position: fixed;
  top: 0;
  left: 0;
  z-index: 0;
}

/* ── SCANLINES OVERLAY ── */
.scanlines {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 1;
  pointer-events: none;
  background: repeating-linear-gradient(
    0deg,
    transparent,
    transparent 2px,
    rgba(0, 0, 0, 0.04) 2px,
    rgba(0, 0, 0, 0.04) 4px
  );
  mix-blend-mode: multiply;
}

/* ── FLOATING ATTRACTOR LABEL ── */
.attractor-label {
  position: fixed;
  bottom: 32px;
  right: 36px;
  z-index: 5;
  font-family: var(--font-mono);
  font-size: var(--font-size-hero);
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--signal);
  text-transform: uppercase;
  opacity: 0.12;
  pointer-events: none;
  user-select: none;
  text-shadow: 0 0 60px var(--signal-glow);
  transition: opacity 0.5s ease;
}

/* ── PANEL TOGGLE BUTTON ── */
.panel-toggle {
  position: fixed;
  top: 20px;
  left: 20px;
  z-index: 100;
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  background: var(--surface);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--signal-dim);
  border-radius: var(--radius-md);
  padding: var(--space-sm) var(--space-md);
  color: var(--signal);
  font-family: var(--font-mono);
  font-size: var(--font-size-xs);
  font-weight: 600;
  letter-spacing: 0.15em;
  cursor: pointer;
  transition: all 0.25s ease;
}
.panel-toggle:hover {
  background: var(--signal-dim);
  border-color: var(--signal);
  box-shadow:
    0 0 20px var(--signal-glow),
    inset 0 0 20px var(--signal-dim);
}
.panel-toggle .toggle-icon {
  display: flex;
  align-items: center;
}
.panel-toggle .toggle-label {
  text-transform: uppercase;
}

/* ── CONTROL PANEL ── */
.panel {
  position: fixed;
  top: 0;
  left: 0;
  z-index: 50;
  width: var(--panel-width);
  height: 100vh;
  background: var(--surface);
  backdrop-filter: blur(24px) saturate(1.2);
  -webkit-backdrop-filter: blur(24px) saturate(1.2);
  border-right: 1px solid var(--signal-dim);
  transform: translateX(0);
  transition: transform 0.35s cubic-bezier(0.4, 0, 0.2, 1);
  overflow-y: auto;
  overflow-x: hidden;
  scrollbar-width: thin;
  scrollbar-color: var(--ink-dim) transparent;
}
.panel.collapsed {
  transform: translateX(calc(-1 * var(--panel-width)));
}
.panel-inner {
  padding: var(--space-xl) var(--space-lg);
  padding-top: 72px; /* space for toggle button */
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
  min-height: 100%;
}

/* Panel scrollbar */
.panel::-webkit-scrollbar {
  width: 4px;
}
.panel::-webkit-scrollbar-track {
  background: transparent;
}
.panel::-webkit-scrollbar-thumb {
  background: var(--ink-dim);
  border-radius: 2px;
}

/* ── PANEL HEADER ── */
.panel-header {
  margin-bottom: var(--space-sm);
}
.panel-title {
  font-size: var(--font-size-lg);
  font-weight: 700;
  letter-spacing: 0.12em;
  color: var(--ink);
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}
.title-glyph {
  color: var(--signal);
  font-size: 1.1em;
  animation: glyph-pulse 3s ease-in-out infinite;
}
@keyframes glyph-pulse {
  0%,
  100% {
    opacity: 1;
  }
  50% {
    opacity: 0.4;
  }
}
.panel-subtitle {
  margin-top: var(--space-xs);
  font-size: var(--font-size-xs);
  letter-spacing: 0.2em;
  color: var(--ink-muted);
  text-transform: uppercase;
}

/* ── DIVIDER ── */
.divider {
  height: 1px;
  background: linear-gradient(
    90deg,
    var(--signal-dim) 0%,
    var(--signal-glow) 50%,
    var(--signal-dim) 100%
  );
  opacity: 0.5;
}

/* ── CONTROL GROUP ── */
.control-group {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}
.control-label {
  font-size: var(--font-size-xs);
  font-weight: 600;
  letter-spacing: 0.2em;
  color: var(--ink-muted);
  text-transform: uppercase;
}

/* ── CUSTOM SELECT ── */
.selector-group .custom-select-wrap {
  position: relative;
}
.custom-select {
  width: 100%;
  appearance: none;
  -webkit-appearance: none;
  background: var(--void-warm);
  border: 1px solid var(--ink-dim);
  border-radius: var(--radius-sm);
  padding: var(--space-sm) var(--space-md);
  padding-right: 36px;
  font-family: var(--font-mono);
  font-size: var(--font-size-sm);
  font-weight: 500;
  color: var(--signal);
  cursor: pointer;
  transition: all 0.2s ease;
  outline: none;
}
.custom-select:hover {
  border-color: var(--signal);
  box-shadow: 0 0 12px var(--signal-glow);
}
.custom-select:focus {
  border-color: var(--signal);
  box-shadow: 0 0 0 2px var(--signal-glow);
}
.custom-select option {
  background: var(--void-warm);
  color: var(--ink);
  padding: var(--space-sm);
}
.select-arrow {
  position: absolute;
  right: 12px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--signal);
  font-size: var(--font-size-sm);
  pointer-events: none;
}

/* ── SLIDER ROW ── */
.slider-row {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

/* ── RANGE SLIDER ── */
.slider {
  -webkit-appearance: none;
  appearance: none;
  flex: 1;
  height: 4px;
  background: var(--ink-dim);
  border-radius: 2px;
  outline: none;
  cursor: pointer;
  transition: background 0.2s ease;
}
.slider:hover {
  background: rgba(200, 208, 220, 0.2);
}

/* Webkit thumb */
.slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--signal);
  border: 2px solid var(--void);
  cursor: pointer;
  transition: all 0.2s ease;
  box-shadow: 0 0 8px var(--signal-glow);
}
.slider::-webkit-slider-thumb:hover {
  transform: scale(1.3);
  box-shadow:
    0 0 16px var(--signal-glow),
    0 0 30px var(--signal-dim);
}
.slider:active::-webkit-slider-thumb {
  background: #fff;
  box-shadow:
    0 0 20px var(--signal-glow),
    0 0 40px var(--signal-glow);
}

/* Firefox thumb */
.slider::-moz-range-thumb {
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--signal);
  border: 2px solid var(--void);
  cursor: pointer;
  transition: all 0.2s ease;
  box-shadow: 0 0 8px var(--signal-glow);
}
.slider::-moz-range-track {
  height: 4px;
  background: var(--ink-dim);
  border-radius: 2px;
  border: none;
}

/* ── NUMBER INPUT ── */
.num-input {
  width: 62px;
  background: var(--void-warm);
  border: 1px solid var(--ink-dim);
  border-radius: var(--radius-sm);
  padding: var(--space-xs) var(--space-sm);
  font-family: var(--font-mono);
  font-size: var(--font-size-sm);
  font-weight: 500;
  color: var(--signal);
  text-align: right;
  outline: none;
  transition: all 0.2s ease;
  -moz-appearance: textfield;
}
.num-input::-webkit-inner-spin-button,
.num-input::-webkit-outer-spin-button {
  -webkit-appearance: none;
  margin: 0;
}
.num-input:hover {
  border-color: var(--signal-glow);
}
.num-input:focus {
  border-color: var(--signal);
  box-shadow: 0 0 0 2px var(--signal-glow);
  background: var(--signal-dim);
}

/* ── ACTION BUTTONS ── */
.actions-group {
  flex-direction: row;
  gap: var(--space-sm);
}
.action-btn {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-xs);
  background: transparent;
  border: 1px solid var(--ink-dim);
  border-radius: var(--radius-sm);
  padding: var(--space-sm) var(--space-md);
  font-family: var(--font-mono);
  font-size: var(--font-size-xs);
  font-weight: 600;
  letter-spacing: 0.12em;
  color: var(--ink-muted);
  cursor: pointer;
  transition: all 0.2s ease;
}
.action-btn:hover {
  color: var(--signal);
  border-color: var(--signal);
  background: var(--signal-dim);
  box-shadow: 0 0 12px var(--signal-glow);
}
.action-btn:active {
  background: var(--signal-glow);
  transform: scale(0.97);
}
.action-icon {
  font-size: 1.1em;
}

/* ── PANEL FOOTER ── */
.panel-footer {
  margin-top: auto;
  padding-top: var(--space-lg);
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
}
.footer-line {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}
.blink-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--signal);
  box-shadow: 0 0 6px var(--signal-glow);
  animation: blink 1.5s ease-in-out infinite;
}
@keyframes blink {
  0%,
  100% {
    opacity: 1;
  }
  50% {
    opacity: 0.2;
  }
}
.footer-text {
  font-size: var(--font-size-xs);
  font-weight: 500;
  letter-spacing: 0.1em;
  color: var(--ink-muted);
}
.footer-hint {
  font-size: var(--font-size-xs);
  color: var(--ink-dim);
  letter-spacing: 0.05em;
  line-height: 1.6;
}

/* ═══════════════════════════════════════════════════════
   ANIMATION — Page Load Staggered Reveal
   ═══════════════════════════════════════════════════════ */
.panel-header,
.selector-group,
.control-group,
.divider,
.actions-group,
.panel-footer {
  animation: fadeSlideIn 0.5s ease both;
}
.panel-header {
  animation-delay: 0.1s;
}
.selector-group {
  animation-delay: 0.15s;
}
.divider {
  animation-delay: 0.2s;
}
.control-group:nth-child(4) {
  animation-delay: 0.25s;
}
.control-group:nth-child(5) {
  animation-delay: 0.3s;
}
.control-group:nth-child(6) {
  animation-delay: 0.35s;
}
.control-group:nth-child(7) {
  animation-delay: 0.4s;
}
.actions-group {
  animation-delay: 0.45s;
}
.panel-footer {
  animation-delay: 0.5s;
}

@keyframes fadeSlideIn {
  from {
    opacity: 0;
    transform: translateX(-12px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

.attractor-label {
  animation: labelFade 1.2s ease 0.6s both;
}
@keyframes labelFade {
  from {
    opacity: 0;
  }
  to {
    opacity: 0.12;
  }
}

/* ═══════════════════════════════════════════════════════
   RESPONSIVE — Mobile-first adaptations
   ═══════════════════════════════════════════════════════ */

/* Medium screens */
@media (max-width: 768px) {
  :root {
    --panel-width: 280px;
    --font-size-hero: 2rem;
  }
  .attractor-label {
    bottom: 20px;
    right: 20px;
  }
}

/* Small screens — panel becomes bottom sheet */
@media (max-width: 540px) {
  :root {
    --panel-width: 100%;
    --font-size-hero: 1.3rem;
  }

  .panel {
    top: auto;
    bottom: 0;
    left: 0;
    width: 100%;
    height: auto;
    max-height: 60vh;
    border-right: none;
    border-top: 1px solid var(--signal-dim);
    border-radius: 14px 14px 0 0;
    transform: translateY(0);
  }
  .panel.collapsed {
    transform: translateY(100%);
  }
  .panel-inner {
    padding: var(--space-lg);
    padding-top: var(--space-md);
    padding-bottom: 70px;
    gap: var(--space-md);
  }

  /* Toggle: centered bottom, always above everything */
  .panel-toggle {
    top: auto;
    bottom: 16px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 110;
    background: var(--void-warm);
    border: 1px solid var(--signal);
    box-shadow: 0 0 12px var(--signal-glow);
    padding: var(--space-sm) var(--space-lg);
  }

  .attractor-label {
    bottom: auto;
    top: 16px;
    right: 16px;
    font-size: 1.2rem;
  }

  .footer-hint {
    display: none;
  }

  /* Larger touch targets */
  .slider::-webkit-slider-thumb {
    width: 22px;
    height: 22px;
  }
  .slider::-moz-range-thumb {
    width: 22px;
    height: 22px;
  }
  .action-btn {
    min-height: 44px;
  }
  .custom-select {
    min-height: 44px;
    font-size: var(--font-size-base);
  }
  .num-input {
    min-height: 36px;
    font-size: var(--font-size-base);
  }
  .slider-row {
    gap: var(--space-md);
  }
}

/* Tiny screens */
@media (max-width: 360px) {
  .panel-inner {
    padding: var(--space-md);
    gap: var(--space-sm);
  }
  .panel-title {
    font-size: var(--font-size-base);
  }
  .num-input {
    width: 52px;
  }
}

/* ═══════════════════════════════════════════════════════
   THEME PICKER
   ═══════════════════════════════════════════════════════ */
.theme-group .theme-swatches {
  display: flex;
  gap: var(--space-sm);
  flex-wrap: wrap;
}
.theme-swatch {
  width: 40px;
  height: 26px;
  border-radius: var(--radius-sm);
  border: 2px solid var(--ink-dim);
  padding: 0;
  cursor: pointer;
  display: flex;
  overflow: hidden;
  transition: all 0.2s ease;
  background: none;
  flex-shrink: 0;
}
.theme-swatch:hover {
  border-color: var(--ink-muted);
  transform: scale(1.12);
}
.theme-swatch.active {
  border-color: var(--signal);
  box-shadow: 0 0 8px var(--signal-glow);
  transform: scale(1.08);
}
.swatch-half {
  flex: 1;
  pointer-events: none;
}

/* ═══════════════════════════════════════════════════════
   UTILITY
   ═══════════════════════════════════════════════════════ */
::selection {
  background: var(--signal);
  color: var(--void);
}

/* Focus visible for accessibility */
:focus-visible {
  outline: 2px solid var(--signal);
  outline-offset: 2px;
}