/* 基础样式 */
:root {
  --primary-color: #4e79ff;
  --secondary-color: #ff4e4e;
  --tertiary-color: #4eff7e;
  --background-color: #000000;
  --panel-bg-color: rgba(20, 22, 30, 0.85);
  --panel-border-color: rgba(255, 255, 255, 0.1);
  --text-color: #ffffff;
  --text-secondary-color: rgba(255, 255, 255, 0.7);
  --button-bg-color: rgba(30, 32, 40, 0.6);
  --button-hover-color: rgba(40, 42, 50, 0.8);
  --button-active-color: rgba(50, 52, 60, 0.9);
  --slider-bg-color: rgba(30, 32, 40, 0.6);
  --slider-thumb-color: var(--primary-color);
  --toggle-bg-color: rgba(30, 32, 40, 0.6);
  --toggle-active-color: var(--primary-color);
  --shadow-color: rgba(0, 0, 0, 0.3);
  --blur-amount: 10px;
  --transition-speed: 0.3s;
  --border-radius-sm: 6px;
  --border-radius-md: 12px;
  --border-radius-lg: 20px;
  --spacing-xs: 5px;
  --spacing-sm: 10px;
  --spacing-md: 15px;
  --spacing-lg: 20px;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  -webkit-tap-highlight-color: transparent;
  touch-action: manipulation;
}

body {
  font-family: 'Arial', 'Microsoft YaHei', sans-serif;
  background-color: var(--background-color);
  color: var(--text-color);
  overflow: hidden;
  height: 100vh;
  width: 100vw;
  position: fixed;
}

/* 容器 */
.app-container {
  position: relative;
  width: 100%;
  height: 100%;
}

/* 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: 1000;
  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);
}

/* 画布容器 */
#canvas-container {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 1;
}

/* 控制面板 */
.control-panel {
  position: fixed;
  top: var(--spacing-md);
  right: var(--spacing-md);
  width: 280px;
  background-color: var(--panel-bg-color);
  border-radius: var(--border-radius-md);
  box-shadow: 0 8px 20px var(--shadow-color);
  z-index: 100;
  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;
  max-height: calc(100vh - 30px);
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.panel-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--spacing-md) var(--spacing-lg);
  border-bottom: 1px solid var(--panel-border-color);
}

.panel-header h2 {
  font-size: 18px;
  font-weight: 500;
  margin: 0;
}

.toggle-button {
  background: none;
  border: none;
  color: var(--text-color);
  cursor: pointer;
  width: 30px;
  height: 30px;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0;
}

.toggle-icon {
  position: relative;
  width: 18px;
  height: 2px;
  background-color: var(--text-color);
  transition: all var(--transition-speed) ease;
}

.toggle-icon::before,
.toggle-icon::after {
  content: '';
  position: absolute;
  width: 18px;
  height: 2px;
  background-color: var(--text-color);
  transition: all var(--transition-speed) ease;
}

.toggle-icon::before {
  transform: translateY(-6px);
}

.toggle-icon::after {
  transform: translateY(6px);
}

.panel-collapsed .toggle-icon {
  background-color: transparent;
}

.panel-collapsed .toggle-icon::before {
  transform: rotate(45deg);
}

.panel-collapsed .toggle-icon::after {
  transform: rotate(-45deg);
}

.panel-content {
  padding: var(--spacing-md) var(--spacing-lg);
  overflow-y: auto;
  flex-grow: 1;
  scrollbar-width: thin;
  scrollbar-color: var(--primary-color) transparent;
}

.panel-content::-webkit-scrollbar {
  width: 6px;
}

.panel-content::-webkit-scrollbar-track {
  background: transparent;
}

.panel-content::-webkit-scrollbar-thumb {
  background-color: var(--primary-color);
  border-radius: 3px;
}

/* 控制组 */
.control-group {
  margin-bottom: var(--spacing-lg);
}

.control-group label {
  display: block;
  margin-bottom: 8px;
  font-size: 14px;
  color: var(--text-secondary-color);
}

.control-row {
  display: flex;
  gap: var(--spacing-sm);
}

/* 预设按钮 */
.preset-buttons {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: var(--spacing-sm);
}

.preset-button {
  flex: 1 0 calc(33% - 8px);
  padding: 8px 0;
  background-color: var(--button-bg-color);
  border: 1px solid var(--panel-border-color);
  border-radius: var(--border-radius-sm);
  color: var(--text-color);
  font-size: 12px;
  cursor: pointer;
  transition: all var(--transition-speed) ease;
  text-align: center;
  min-width: 0;
}

.preset-button:hover {
  background-color: var(--button-hover-color);
}

.preset-button.active {
  background-color: var(--primary-color);
  border-color: var(--primary-color);
}

/* 控制按钮 */
.control-button {
  flex: 1;
  padding: var(--spacing-sm);
  background-color: var(--button-bg-color);
  border: 1px solid var(--panel-border-color);
  border-radius: var(--border-radius-sm);
  color: var(--text-color);
  font-family: inherit;
  font-size: 14px;
  cursor: pointer;
  transition: all var(--transition-speed) ease;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
}

.control-button:hover {
  background-color: var(--button-hover-color);
  transform: translateY(-2px);
}

.control-button:active {
  background-color: var(--button-active-color);
  transform: translateY(0);
}

.button-icon {
  width: 16px;
  height: 16px;
  display: inline-block;
  position: relative;
}

.pause-icon::before,
.pause-icon::after {
  content: '';
  position: absolute;
  width: 4px;
  height: 14px;
  background-color: var(--text-color);
  top: 1px;
}

.pause-icon::before {
  left: 3px;
}

.pause-icon::after {
  right: 3px;
}

.play-icon {
  position: relative;
}

.play-icon::before {
  content: '';
  position: absolute;
  width: 0;
  height: 0;
  border-top: 7px solid transparent;
  border-bottom: 7px solid transparent;
  border-left: 12px solid var(--text-color);
  left: 2px;
  top: 1px;
}

.reset-icon::before {
  content: '';
  position: absolute;
  width: 12px;
  height: 12px;
  border: 2px solid var(--text-color);
  border-radius: 50%;
  left: 1px;
  top: 1px;
}

.reset-icon::after {
  content: '';
  position: absolute;
  width: 0;
  height: 0;
  border-top: 4px solid transparent;
  border-bottom: 4px solid transparent;
  border-left: 6px solid var(--text-color);
  left: 4px;
  top: -2px;
  transform: rotate(-45deg);
}

/* 滑块容器 */
.slider-container {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.slider-button {
  width: 30px;
  height: 30px;
  background-color: var(--button-bg-color);
  border: 1px solid var(--panel-border-color);
  border-radius: var(--border-radius-sm);
  color: var(--text-color);
  font-size: 16px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-speed) ease;
}

.slider-button:hover {
  background-color: var(--button-hover-color);
}

.slider-button:active {
  background-color: var(--button-active-color);
}

/* 滑块 */
input[type="range"] {
  -webkit-appearance: none;
  width: 100%;
  height: 6px;
  background: var(--slider-bg-color);
  border-radius: 3px;
  outline: none;
  margin: var(--spacing-sm) 0;
}

input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--slider-thumb-color);
  cursor: pointer;
  border: none;
  box-shadow: 0 2px 4px var(--shadow-color);
}

input[type="range"]::-moz-range-thumb {
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--slider-thumb-color);
  cursor: pointer;
  border: none;
  box-shadow: 0 2px 4px var(--shadow-color);
}

/* 开关选项 */
.toggle-options {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-sm);
}

.toggle-switch {
  position: relative;
  display: inline-flex;
  align-items: center;
  cursor: pointer;
  padding: 5px 0;
  flex: 1 0 calc(50% - 5px);
}

.toggle-switch input {
  opacity: 0;
  width: 0;
  height: 0;
}

.toggle-slider {
  position: relative;
  display: inline-block;
  width: 36px;
  height: 20px;
  background-color: var(--toggle-bg-color);
  border-radius: 10px;
  transition: all var(--transition-speed) ease;
  margin-right: 8px;
}

.toggle-slider:before {
  position: absolute;
  content: "";
  height: 16px;
  width: 16px;
  left: 2px;
  bottom: 2px;
  background-color: var(--text-color);
  border-radius: 50%;
  transition: all var(--transition-speed) ease;
}

input:checked + .toggle-slider {
  background-color: var(--toggle-active-color);
}

input:checked + .toggle-slider:before {
  transform: translateX(16px);
}

.toggle-label {
  font-size: 14px;
  color: var(--text-color);
}

/* 恒星参数 */
.stars-control {
  margin-top: var(--spacing-lg);
}

.star-params {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
}

.star-param-group {
  padding: var(--spacing-sm);
  background-color: rgba(0, 0, 0, 0.2);
  border-radius: var(--border-radius-sm);
}

.star-header {
  display: flex;
  align-items: center;
  margin-bottom: 8px;
}

.star-color {
  display: inline-block;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  margin-right: 8px;
}

.star-header h4 {
  font-size: 14px;
  font-weight: 500;
  margin: 0;
  flex-grow: 1;
}

.star-mass {
  font-size: 14px;
  color: var(--text-secondary-color);
}

.star-slider {
  width: 100%;
}

/* 信息面板 */
.info-panel {
  position: fixed;
  left: var(--spacing-md);
  bottom: var(--spacing-md);
  background-color: var(--panel-bg-color);
  border-radius: var(--border-radius-md);
  padding: var(--spacing-md);
  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);
  z-index: 100;
  transition: all var(--transition-speed) ease;
  transform: translateY(calc(100% + 20px));
  opacity: 0;
}

.info-panel.visible {
  transform: translateY(0);
  opacity: 1;
}

.info-content {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.info-row {
  display: flex;
  justify-content: space-between;
  font-size: 14px;
}

.info-label {
  color: var(--text-secondary-color);
  margin-right: var(--spacing-md);
}

.info-value {
  color: var(--text-color);
  font-weight: 500;
}

/* 移动端控制提示 */
.mobile-controls-hint {
  position: fixed;
  bottom: var(--spacing-md);
  left: 50%;
  transform: translateX(-50%);
  background-color: var(--panel-bg-color);
  padding: 8px var(--spacing-md);
  border-radius: var(--border-radius-lg);
  font-size: 12px;
  color: var(--text-secondary-color);
  z-index: 100;
  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);
  display: flex;
  align-items: center;
  transition: all var(--transition-speed) ease;
}

.hint-content {
  flex-grow: 1;
  text-align: center;
}

.hint-close {
  background: none;
  border: none;
  color: var(--text-secondary-color);
  font-size: 18px;
  cursor: pointer;
  padding: 0 0 0 var(--spacing-sm);
  display: flex;
  align-items: center;
  justify-content: center;
}

/* 加载指示器 */
.loading-indicator {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: var(--background-color);
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  z-index: 2000;
  transition: opacity 0.5s ease;
}

.loading-spinner {
  width: 50px;
  height: 50px;
  border: 3px solid rgba(255, 255, 255, 0.1);
  border-top-color: var(--primary-color);
  border-radius: 50%;
  animation: spin 1s linear infinite;
  margin-bottom: var(--spacing-lg);
}

.loading-text {
  font-size: 16px;
  color: var(--text-secondary-color);
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

/* 面板折叠状态 */
.panel-collapsed .panel-content {
  display: none;
}

.panel-collapsed {
  width: auto;
  background-color: var(--panel-bg-color);
}

.panel-hidden {
  transform: translateX(calc(100% - 40px));
}

.panel-hidden .panel-header h2 {
  display: none;
}

/* 响应式设计 */
@media (max-width: 768px) {
  .control-panel {
    width: 260px;
    max-height: 60vh;
  }

  .panel-collapsed {
    width: auto;
  }

  .preset-button {
    font-size: 11px;
    padding: 6px 0;
  }

  .star-param-group {
    padding: 8px;
  }

  .star-header h4 {
    font-size: 13px;
  }

  .star-mass {
    font-size: 13px;
  }
}

@media (max-width: 480px) {
  .control-panel {
    width: 240px;
    max-height: 50vh;
  }

  .panel-header {
    padding: 12px 15px;
  }

  .panel-content {
    padding: 12px 15px;
  }

  .preset-buttons {
    gap: 6px;
  }

  .preset-button {
    flex: 1 0 calc(50% - 3px);
    font-size: 10px;
    padding: 5px 0;
  }

  .control-button {
    font-size: 13px;
  }

  .toggle-switch {
    flex: 1 0 100%;
  }
}

/* 动画 */
@keyframes pulse {
  0% {
    transform: scale(1);
  }
  50% {
    transform: scale(1.05);
  }
  100% {
    transform: scale(1);
  }
}

@keyframes fadeIn {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

@keyframes slideIn {
  from {
    transform: translateY(20px);
    opacity: 0;
  }
  to {
    transform: translateY(0);
    opacity: 1;
  }
}

/* 辅助类 */
.hidden {
  display: none !important;
}

.visible {
  display: block !important;
}

.fade-in {
  animation: fadeIn 0.5s ease forwards;
}

.slide-in {
  animation: slideIn 0.5s ease forwards;
}

.pulse {
  animation: pulse 1s ease infinite;
}