/*
 * 粒子游泳 - Particle Swimming
 * 样式表
 */

:root {
  --primary-color: #3498db;
  --secondary-color: #2ecc71;
  --accent-color: #9b59b6;
  --text-color: #f5f5f5;
  --background-color: #121212;
  --panel-bg-color: rgba(30, 30, 30, 0.8);
  --panel-border-color: rgba(255, 255, 255, 0.1);
  --button-hover-color: rgba(255, 255, 255, 0.1);
  --slider-track-color: rgba(255, 255, 255, 0.2);
  --slider-thumb-color: rgba(255, 255, 255, 0.8);

  --border-radius-sm: 4px;
  --border-radius-md: 8px;
  --border-radius-lg: 12px;

  --spacing-xs: 4px;
  --spacing-sm: 8px;
  --spacing-md: 16px;
  --spacing-lg: 24px;

  --transition-speed: 0.3s;
  --blur-amount: 10px;
  --shadow-color: rgba(0, 0, 0, 0.2);
}

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

body {
  font-family: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
  background-color: var(--background-color);
  color: var(--text-color);
  overflow: hidden;
  touch-action: none;
  -webkit-tap-highlight-color: transparent;
  position: fixed;
  width: 100%;
  height: 100%;
}

canvas {
  display: block;
  position: absolute;
  top: 0;
  left: 0;
  z-index: 1;
}

/* 控制面板 */
.controls-panel {
  position: fixed;
  bottom: var(--spacing-md);
  right: var(--spacing-md);
  background-color: var(--panel-bg-color);
  border-radius: var(--border-radius-lg);
  padding: var(--spacing-md);
  z-index: 10;
  width: 300px;
  max-width: 90vw;
  backdrop-filter: blur(var(--blur-amount));
  -webkit-backdrop-filter: blur(var(--blur-amount));
  border: 1px solid var(--panel-border-color);
  box-shadow: 0 4px 8px var(--shadow-color);
  transition: transform var(--transition-speed) ease, opacity var(--transition-speed) ease;
  transform: translateY(0);
  opacity: 0.9;
}

.controls-panel.collapsed {
  transform: translateY(calc(100% - 40px));
  opacity: 0.7;
}

.controls-panel:hover {
  opacity: 1;
}

.panel-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--spacing-md);
  cursor: pointer;
}

.panel-title {
  font-size: 16px;
  font-weight: 500;
}

.toggle-panel {
  background: none;
  border: none;
  color: var(--text-color);
  cursor: pointer;
  font-size: 18px;
  transition: transform var(--transition-speed) ease;
}

.controls-panel.collapsed .toggle-panel {
  transform: rotate(180deg);
}

.control-group {
  margin-bottom: var(--spacing-md);
}

.control-group-title {
  font-size: 14px;
  margin-bottom: var(--spacing-sm);
  opacity: 0.8;
}

.slider-control {
  display: flex;
  align-items: center;
  margin-bottom: var(--spacing-sm);
  flex-wrap: nowrap;
}

.slider-label {
  width: 100px;
  font-size: 14px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.slider-input {
  flex: 1;
  -webkit-appearance: none;
  appearance: none;
  height: 6px;
  background: var(--slider-track-color);
  border-radius: 3px;
  outline: none;
  margin: 0 var(--spacing-xs);
}

.slider-input::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--slider-thumb-color);
  cursor: pointer;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.3);
}

.slider-input::-moz-range-thumb {
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--slider-thumb-color);
  cursor: pointer;
  border: none;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.3);
}

.slider-value {
  width: 40px;
  text-align: right;
  font-size: 14px;
  margin-left: var(--spacing-xs);
  font-variant-numeric: tabular-nums;
}

.checkbox-control {
  display: flex;
  align-items: center;
  margin-bottom: var(--spacing-sm);
}

.checkbox-label {
  font-size: 14px;
  margin-left: var(--spacing-sm);
}

/* 返回链接 */
.back-link {
  position: fixed;
  top: var(--spacing-md);
  left: var(--spacing-md);
  background-color: var(--panel-bg-color);
  color: var(--text-color);
  padding: 8px var(--spacing-md);
  border-radius: var(--border-radius-lg);
  text-decoration: none;
  font-size: 14px;
  z-index: 10;
  backdrop-filter: blur(var(--blur-amount));
  -webkit-backdrop-filter: blur(var(--blur-amount));
  border: 1px solid var(--panel-border-color);
  transition: all var(--transition-speed) ease;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 8px var(--shadow-color);
}

.back-link:hover, .back-link:active {
  background-color: var(--button-hover-color);
  transform: translateY(-2px);
}

/* 版本信息 */
.version-info {
  position: fixed;
  bottom: var(--spacing-md);
  left: var(--spacing-md);
  font-size: 12px;
  opacity: 0.7;
  z-index: 10;
  background-color: rgba(0, 0, 0, 0.2);
  padding: 4px 8px;
  border-radius: 12px;
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
}

/* 响应式调整 */
@media (max-width: 768px) {
  .controls-panel {
    width: 280px;
    padding: var(--spacing-sm);
    bottom: var(--spacing-sm);
    right: var(--spacing-sm);
  }

  .slider-label {
    width: 100px;
    font-size: 12px;
    white-space: nowrap;
  }

  .slider-value {
    font-size: 12px;
  }

  .back-link {
    padding: 6px var(--spacing-sm);
    font-size: 12px;
  }
}

@media (max-width: 480px) {
  .controls-panel {
    width: 90%;
    max-width: 320px;
  }

  .slider-control {
    flex-wrap: wrap;
  }

  .slider-label {
    width: 100%;
    margin-bottom: 4px;
  }

  .slider-input {
    width: calc(100% - 50px);
  }

  .panel-header {
    margin-bottom: var(--spacing-sm);
  }

  .control-group {
    margin-bottom: var(--spacing-sm);
  }

  .control-group-title {
    margin-bottom: 4px;
  }
}