:root {
  font-family: "Inter", "PingFang SC", "Microsoft YaHei", sans-serif;
  line-height: 1.5;
  font-size: 16px;
  --bg: #0b0c10;
  --panel: #11141a;
  --border: #1a1f2a;
  --text: #eaf0f6;
  --muted: #9fb3c8;
  --accent: #79c0ff;
  --surface-alt: #0f1626;
  --preview-zoom: 1;
  --grid-offset-x: 0px;
  --grid-offset-y: 0px;
}

* {
  box-sizing: border-box;
}

html,
body {
  height: 100%;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

main {
  display: grid;
  grid-template-columns: minmax(280px, 360px) 1fr;
  gap: 16px;
  padding: 16px;
  flex: 1;
  min-height: 568px;
}

.panel {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 18px 0;
  display: flex;
  flex-direction: column;
  gap: 0;
  min-height: 0;
}

.panel h2 {
  margin: 0;
  font-size: 15px;
  color: var(--muted);
  letter-spacing: 0.2px;
}

.app-header {
  padding: 0 18px;
}

.app-header h1 {
  margin: 0;
  font-size: 18px;
  letter-spacing: 0.3px;
}

.app-header p {
  margin: 4px 0 0;
  color: var(--muted);
  font-size: 13px;
}

.app-links {
  margin-top: 12px;
  display: flex;
  gap: 10px;
}

.app-link {
  width: 34px;
  height: 34px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: rgba(14, 17, 23, 0.9);
  border: 1px solid #253049;
  color: inherit;
  padding: 0;
  transition: border-color 0.2s ease, transform 0.2s ease;
  cursor: pointer;
}

.app-link svg {
  width: 18px;
  height: 18px;
  fill: currentColor;
}

.app-link:hover {
  border-color: var(--accent);
  transform: translateY(-1px);
}

.app-link:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

button.app-link {
  background: rgba(14, 17, 23, 0.9);
  border: 1px solid #253049;
  padding: 0;
}

.panel.controls {
  overflow: hidden;
}

form {
  display: flex;
  flex-direction: column;
  gap: 16px;
  flex: 1;
  overflow-y: auto;
  padding: 28px 18px 0 18px;
}

.row {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
}

.field-row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 16px;
}

.field {
  display: flex;
  flex-direction: column;
  gap: 6px;
  min-width: 0;
}

.field-label,
label {
  color: var(--muted);
  font-size: 13px;
  font-weight: 600;
}

input[type="number"],
input[type="color"],
input[type="range"],
button,
textarea {
  font: inherit;
}

input[type="number"] {
  width: 100%;
  padding: 8px 12px;
  border-radius: 10px;
  border: 1px solid #253049;
  background: #0e1117;
  color: var(--text);
}

input[type="range"] {
  width: 100%;
  accent-color: var(--accent);
}

.range-wrapper {
  display: flex;
  align-items: center;
  gap: 10px;
  width: 100%;
}

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

.val {
  min-width: 52px;
  text-align: right;
  color: var(--accent);
  font-variant-numeric: tabular-nums;
}

.option-row {
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
}

.option-row .field-label {
  flex: 0 0 auto;
}

.option-row .segmented {
  flex: 1;
  min-width: 200px;
}

.segmented {
  display: inline-grid;
  grid-auto-flow: column;
  gap: 6px;
  background: #0e1117;
  border-radius: 12px;
  padding: 4px;
  border: 1px solid #253049;
}

.segmented input[type="radio"] {
  display: none;
}

.segmented label {
  padding: 6px 10px;
  border-radius: 10px;
  cursor: pointer;
  color: var(--muted);
  transition: background 0.2s ease, color 0.2s ease;
  text-align: center;
}

.segmented input[type="radio"]:checked + label {
  background: var(--accent);
  color: #0e1117;
}

.form-divider {
  height: 1px;
  background: rgba(47, 59, 88, 0.6);
  border: 0;
  margin: 28px 0 0 0;
}

.form-gap {
  height: 8px;
  min-height: 8px;
}

.toggle-group {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.toggle-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 10px 12px;
  border-radius: 12px;
  border: 1px solid #253049;
  background: #0e1117;
  cursor: pointer;
  transition: border-color 0.2s ease, background 0.2s ease;
}

.toggle-row:hover {
  border-color: var(--accent);
}

.toggle-row:focus-within {
  border-color: var(--accent);
}

.toggle-label {
  font-size: 13px;
  color: var(--muted);
  font-weight: 600;
}

.toggle-control {
  position: relative;
  width: 46px;
  height: 24px;
}

.toggle-control input[type="checkbox"] {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  margin: 0;
  opacity: 0;
  cursor: pointer;
  z-index: 2;
}

.toggle-slider {
  position: absolute;
  inset: 0;
  background: #1d2537;
  border-radius: 999px;
  transition: background 0.2s ease, box-shadow 0.2s ease;
}

.toggle-slider::after {
  content: "";
  position: absolute;
  top: 4px;
  left: 4px;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--muted);
  transition: transform 0.2s ease, background 0.2s ease;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.35);
}

.toggle-control input[type="checkbox"]:checked + .toggle-slider {
  background: var(--accent);
}

.toggle-control input[type="checkbox"]:checked + .toggle-slider::after {
  transform: translateX(18px);
  background: #0b0c10;
}

.toggle-control input[type="checkbox"]:focus-visible + .toggle-slider {
  box-shadow: 0 0 0 2px rgba(121, 192, 255, 0.3);
}

button {
  padding: 8px 14px;
  border-radius: 12px;
  border: 1px solid #253049;
  background: #0e1117;
  color: var(--text);
  cursor: pointer;
  transition: border-color 0.2s ease, transform 0.2s ease;
}

button:hover {
  border-color: #2f3b58;
  transform: translateY(-1px);
}

.panel.preview {
  min-height: fit-content;
  gap: 12px;
  padding: 18px;
}

.preview-header {
  display: flex;
  align-items: center;
  gap: 16px;
}

.preview-header h2 {
  flex: 1;
}

.preview-header-tools {
  display: flex;
  align-items: center;
  gap: 16px;
}

.legend {
  display: flex;
  gap: 12px;
  color: var(--muted);
  font-size: 12px;
  flex-wrap: wrap;
  align-items: center;
  justify-content: flex-end;
}

.legend span {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.legend-dot {
  display: inline-block;
  width: 16px;
  height: 6px;
  border-radius: 999px;
  vertical-align: middle;
}

.legend-dash {
  background: #ffffff;
}

.legend-break {
  background: #ffb703;
}

.zoom-controls {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  background: rgba(14, 17, 23, 0.85);
  border: 1px solid #253049;
  border-radius: 999px;
  padding: 6px 12px;
  color: var(--muted);
  font-size: 13px;
}

.zoom-controls button {
  border-radius: 999px;
  border: 1px solid #253049;
  background: #141a24;
  color: var(--text);
  padding: 4px 10px;
  font-size: 14px;
  line-height: 1;
  min-width: 36px;
}

.zoom-controls #zoomDisplay {
  min-width: 72px;
  text-align: center;
  font-variant-numeric: tabular-nums;
  color: var(--accent);
}

.preview-canvas {
  margin-top: 8px;
  flex: 1;
  position: relative;
  border-radius: 12px;
  border: 1px solid #253049;
  background-color: #0a0c12;
  background-image:
    linear-gradient(rgba(121, 192, 255, 0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(121, 192, 255, 0.05) 1px, transparent 1px),
    linear-gradient(rgba(121, 192, 255, 0.12) 1px, transparent 1px),
    linear-gradient(90deg, rgba(121, 192, 255, 0.12) 1px, transparent 1px);
  background-size:
    calc(20px * var(--preview-zoom)) calc(20px * var(--preview-zoom)),
    calc(20px * var(--preview-zoom)) calc(20px * var(--preview-zoom)),
    calc(100px * var(--preview-zoom)) calc(100px * var(--preview-zoom)),
    calc(100px * var(--preview-zoom)) calc(100px * var(--preview-zoom));
  background-position:
    var(--grid-offset-x) var(--grid-offset-y),
    var(--grid-offset-x) var(--grid-offset-y),
    var(--grid-offset-x) var(--grid-offset-y),
    var(--grid-offset-x) var(--grid-offset-y);
  overflow: hidden;
  cursor: grab;
}

.preview-canvas:active {
  cursor: grabbing;
}

.preview-stage {
  position: absolute;
  top: 0;
  left: 0;
  width: 640px;
  height: 480px;
  transform: translate(0, 0);
}

.preview-scene {
  width: 100%;
  height: 100%;
  transform-origin: 0 0;
}

.preview-actions {
  position: absolute;
  left: 12px;
  bottom: 12px;
  display: flex;
  gap: 10px;
  z-index: 2;
}

.preview-actions button {
  background: rgba(14, 17, 23, 0.85);
  border: 1px solid #2f3b58;
  color: var(--text);
}

.preview-actions button:hover {
  border-color: var(--accent);
}

.preview-toggle {
  position: absolute;
  top: 12px;
  right: 12px;
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--muted);
  font-size: 12px;
  font-weight: 600;
  z-index: 3;
  user-select: none;
  cursor: default;
}

.preview-toggle-text {
  letter-spacing: 0.2px;
}

.hint {
  margin: 0;
  padding-left: 18px;
  color: var(--muted);
  font-size: 12px;
  line-height: 1.6;
}

.hint li {
  margin-bottom: 4px;
}

.hint li:last-child {
  margin-bottom: 0;
}

textarea {
  width: 100%;
  min-height: 100px;
  height: 20%;
  max-height: 300px;
  resize: vertical;
  border-radius: 12px;
  border: 1px solid #253049;
  background: #0e1117;
  color: #cbd5f5;
  padding: 12px;
  font-family: "JetBrains Mono", "Fira Code", monospace;
  font-size: 13px;
}

.toast-container {
  position: fixed;
  top: 24px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  gap: 10px;
  z-index: 999;
  pointer-events: none;
}

.toast {
  min-width: 220px;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 183, 3, 0.4);
  border-left: 3px solid #ffb703;
  border-radius: 12px;
  padding: 12px 16px;
  box-shadow: 0 12px 24px rgba(5, 9, 20, 0.55);
  color: var(--text);
  font-size: 13px;
  line-height: 1.5;
  opacity: 0;
  transform: translateY(-12px);
  animation: toast-in 180ms ease forwards;
}

.toast.hide {
  animation: toast-out 160ms ease forwards;
}

@keyframes toast-in {
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes toast-out {
  to {
    opacity: 0;
    transform: translateY(-8px);
  }
}

@media (max-width: 960px) {
  main {
    display: flex;
    flex-direction: column;
    gap: 20px;
    height: auto;
  }

  .panel {
    min-height: fit-content;
  }

  .panel.controls {
    order: 1;
    max-height: none;
  }

  .panel.controls form {
    overflow: visible;
  }

  .panel.preview {
    order: 2;
  }

  .field-row {
    grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  }

  .preview-header {
    flex-direction: column;
    align-items: flex-start;
  }

  .preview-header-tools {
    width: 100%;
    justify-content: space-between;
    flex-wrap: wrap;
  }

  .preview-canvas {
    min-height: 320px;
  }

  .preview-stage,
  .preview-scene {
    min-height: inherit;
  }
}

@media (max-width: 540px) {
  /* .option-row {
    flex-direction: column;
    align-items: flex-start;
  } */

  .preview-header-tools {
    flex-direction: column;
    align-items: flex-start;
    gap: 12px;
  }

  .field-row {
    grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  }

  .preview-canvas {
    min-height: 320px;
  }
}