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

:root {
  --bg: #111118;
  --surface: #1a1a24;
  --surface2: #24243a;
  --border: #333350;
  --text: #e0e0f0;
  --text-dim: #8888aa;
  --accent: #ff6b35;
  --accent-hover: #ff8855;
  --radius: 8px;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  background: var(--bg);
  color: var(--text);
  height: 100vh;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

/* --- Header --- */

header {
  padding: 12px 24px;
  border-bottom: 1px solid var(--border);
}

header h1 {
  font-size: 20px;
  font-weight: 700;
  letter-spacing: 2px;
  color: var(--accent);
  text-transform: lowercase;
}

/* --- Main Layout --- */

main {
  display: flex;
  flex: 1;
  min-height: 0;
  overflow: hidden;
}

/* --- Controls Panel --- */

#controls {
  width: 420px;
  min-width: 420px;
  border-right: 1px solid var(--border);
  overflow-y: auto;
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.controls-section {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.section-label {
  font-weight: 600;
  font-size: 13px;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--text-dim);
}

/* --- Wave Count Row --- */

.wave-count-row {
  display: flex;
  align-items: center;
  gap: 8px;
}

.wave-count-row button {
  width: 30px;
  height: 30px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface2);
  color: var(--text);
  font-size: 16px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.15s;
}

.wave-count-row button:hover {
  background: var(--accent);
  border-color: var(--accent);
}

#wave-count {
  font-weight: 600;
  font-size: 14px;
  min-width: 20px;
  text-align: center;
}

#randomize {
  margin-left: auto;
  width: auto !important;
  padding: 0 12px;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.5px;
}

#save-project,
#load-project {
  width: auto !important;
  padding: 0 12px;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.5px;
}

/* --- Wave List --- */

#wave-list {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.wave-row {
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 8px 10px;
  cursor: default;
  transition: border-color 0.15s, opacity 0.15s;
}

.wave-row.dragging {
  opacity: 0.4;
}

.wave-row.drag-over {
  border-color: var(--accent);
}

.wave-row-header {
  display: flex;
  align-items: center;
  gap: 8px;
}

.drag-handle {
  cursor: grab;
  color: var(--text-dim);
  font-size: 14px;
  user-select: none;
  line-height: 1;
}

.drag-handle:active {
  cursor: grabbing;
}

.wave-label {
  font-size: 12px;
  font-weight: 600;
  color: var(--text-dim);
  min-width: 50px;
}

.wave-color {
  width: 28px;
  height: 28px;
  border: none;
  border-radius: 4px;
  cursor: pointer;
  background: none;
  padding: 0;
}

.wave-color::-webkit-color-swatch-wrapper {
  padding: 0;
}

.wave-color::-webkit-color-swatch {
  border: 1px solid var(--border);
  border-radius: 4px;
}

.wave-color::-moz-color-swatch {
  border: 1px solid var(--border);
  border-radius: 4px;
}

.wave-color2 {
  width: 28px;
  height: 28px;
  border: none;
  border-radius: 4px;
  cursor: pointer;
  background: none;
  padding: 0;
}

.wave-color2::-webkit-color-swatch-wrapper {
  padding: 0;
}

.wave-color2::-webkit-color-swatch {
  border: 1px solid var(--border);
  border-radius: 4px;
}

.wave-color2::-moz-color-swatch {
  border: 1px solid var(--border);
  border-radius: 4px;
}

.gradient-toggle {
  background: none;
  border: none;
  cursor: pointer;
  font-size: 18px;
  padding: 2px;
  color: var(--text-dim);
  opacity: 0.5;
  transition: opacity 0.15s, color 0.15s;
}

.gradient-toggle:hover {
  opacity: 0.8;
}

.gradient-toggle.active {
  opacity: 1;
  color: var(--accent);
}

.wave-color2.ghosted {
  opacity: 0.2;
  pointer-events: none;
}

.eye-toggle {
  background: none;
  border: none;
  cursor: pointer;
  font-size: 16px;
  padding: 2px;
  opacity: 0.8;
  transition: opacity 0.15s;
  margin-left: auto;
}

.eye-toggle:hover {
  opacity: 1;
}

.eye-toggle.hidden {
  opacity: 0.3;
}

.wave-row-sliders {
  display: flex;
  flex-direction: column;
  gap: 4px;
  margin-top: 6px;
}

.wave-slider-row {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 11px;
  color: var(--text-dim);
}

.wave-slider-row span:first-child {
  min-width: 48px;
}

.wave-slider-row input[type="range"] {
  flex: 1;
}

.wave-slider-row .slider-value {
  min-width: 28px;
  width: 28px;
  text-align: left;
  font-variant-numeric: tabular-nums;
  flex-shrink: 0;
}

.wave-slider-row .btn-slot {
  min-width: 34px;
  width: 34px;
  flex-shrink: 0;
  display: flex;
  justify-content: flex-start;
}

.invert-toggle,
.calm-toggle,
.blob-toggle {
  padding: 1px 5px;
  font-size: 10px;
  font-weight: 600;
  border: 1px solid var(--border);
  border-radius: 3px;
  background: var(--surface);
  color: var(--text-dim);
  cursor: pointer;
}

.invert-toggle.active,
.calm-toggle.active,
.blob-toggle.active {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}

/* --- Global Controls --- */

.control-row {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
}

.control-row span:first-child {
  min-width: 85px;
  color: var(--text-dim);
}

.control-row input[type="range"] {
  flex: 1;
}

.control-row select {
  flex: 1;
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: 4px;
  color: var(--text);
  padding: 4px 8px;
  font-size: 13px;
}

.control-row input[type="color"] {
  width: 36px;
  height: 28px;
  border: none;
  border-radius: 4px;
  cursor: pointer;
  background: none;
  padding: 0;
}

.range-value {
  min-width: 32px;
  text-align: right;
  font-size: 12px;
  color: var(--text-dim);
  font-variant-numeric: tabular-nums;
}

/* --- Range Slider Styling --- */

input[type="range"] {
  -webkit-appearance: none;
  appearance: none;
  height: 4px;
  background: var(--border);
  border-radius: 2px;
  outline: none;
}

input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--accent);
  cursor: pointer;
  border: none;
}

input[type="range"]::-moz-range-thumb {
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--accent);
  cursor: pointer;
  border: none;
}

/* --- Preview --- */

#preview {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
  position: relative;
  background: var(--bg);
  overflow: hidden;
}

#svg-canvas {
  width: 100%;
  height: 100%;
  max-width: 100%;
  max-height: 100%;
  border-radius: var(--radius);
  box-shadow: 0 4px 24px rgba(0,0,0,0.4);
  overflow: hidden;
}

/* --- Footer (Code View & Export) --- */

footer {
  border-top: 1px solid var(--border);
  background: var(--surface);
  flex-shrink: 0;
  max-height: 35vh;
  overflow-y: auto;
}

#code-view {
  padding: 12px 24px;
}

.tab-bar {
  display: flex;
  align-items: center;
  gap: 4px;
  margin-bottom: 8px;
}

.tab {
  padding: 6px 14px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface2);
  color: var(--text-dim);
  font-size: 12px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.15s;
}

.tab:hover {
  color: var(--text);
}

.tab.active {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}

#copy-code {
  margin-left: auto;
  padding: 6px 14px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface2);
  color: var(--text);
  font-size: 12px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.15s;
}

#copy-code:hover {
  background: var(--accent);
  border-color: var(--accent);
}

#code-view pre {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 12px 16px;
  max-height: 200px;
  overflow: auto;
  font-family: 'SF Mono', 'Fira Code', 'Cascadia Code', monospace;
  font-size: 12px;
  line-height: 1.5;
  color: var(--text-dim);
  white-space: pre;
  tab-size: 2;
}

#export-bar {
  display: flex;
  gap: 8px;
  padding: 0 24px 12px;
}

#export-bar button {
  padding: 8px 16px;
  border: 1px solid var(--accent);
  border-radius: var(--radius);
  background: transparent;
  color: var(--accent);
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.15s;
}

#export-bar button:hover {
  background: var(--accent);
  color: #fff;
}

/* --- Tip Jar Modal --- */

.modal {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.6);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
}

.modal.hidden {
  display: none;
}

.modal-content {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  max-width: 440px;
  width: 90%;
  position: relative;
}

.modal-content h3 {
  color: var(--text);
  margin-bottom: 8px;
  font-size: 16px;
}

.modal-content p {
  color: var(--text-dim);
  font-size: 13px;
  margin-bottom: 16px;
}

.modal-close {
  position: absolute;
  top: 8px;
  right: 12px;
  background: none;
  border: none;
  color: var(--text-dim);
  font-size: 20px;
  cursor: pointer;
}

.modal-close:hover {
  color: var(--text);
}

.tip-row {
  margin-bottom: 12px;
}

.tip-row strong {
  display: block;
  color: var(--text);
  font-size: 12px;
  margin-bottom: 4px;
}

.tip-row code {
  display: block;
  background: var(--surface2);
  padding: 6px 10px;
  border-radius: 4px;
  font-size: 11px;
  color: var(--accent);
  word-break: break-all;
  cursor: pointer;
}

.tip-row code:hover {
  background: var(--border);
}

/* --- Instructions Modal --- */

.instructions-content {
  max-width: 560px;
  max-height: 80vh;
  overflow-y: auto;
}

.instructions-content h4 {
  color: var(--accent);
  font-size: 13px;
  margin: 16px 0 8px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.instructions-content h4:first-of-type {
  margin-top: 8px;
}

.instructions-content dl {
  margin: 0;
}

.instructions-content dt {
  color: var(--text);
  font-size: 12px;
  font-weight: 600;
  margin-top: 8px;
}

.instructions-content dd {
  color: var(--text-dim);
  font-size: 12px;
  margin: 2px 0 0 0;
  line-height: 1.5;
}

/* --- Fullscreen Button --- */

#fullscreen-btn,
#viewer-btn {
  position: absolute;
  top: 8px;
  left: 8px;
  width: 28px;
  height: 28px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
  color: var(--text-dim);
  font-size: 14px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0.5;
  transition: opacity 0.15s;
  z-index: 10;
}

#viewer-btn {
  left: 42px;
}

#fullscreen-btn:hover,
#viewer-btn:hover {
  opacity: 1;
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}

#preview:fullscreen {
  background: #000;
  padding: 0;
}

#preview:fullscreen #fullscreen-btn,
#preview:fullscreen #viewer-btn {
  opacity: 0;
}

/* --- Responsive --- */

@media (max-width: 768px) {
  main {
    flex-direction: column;
  }

  #controls {
    width: 100%;
    min-width: 0;
    max-height: 40vh;
    border-right: none;
    border-bottom: 1px solid var(--border);
  }

  #preview {
    padding: 16px;
    min-height: 300px;
  }

  #export-bar {
    flex-wrap: wrap;
  }
}