/* 入口独立加载，避免应用脚本下载期间出现空白页。 */
/* 进度与鸭子使用同周期的 transform 动画，交由合成线程运行。 */

:root {
  --entry-bg: #f5f5f7;
  --entry-ink: #343842;
  --entry-track: #dedfe5;
  --entry-accent: #8391b0;
  --entry-duck: #f0ce75;
  --entry-duck-beak: #e5a458;
  --entry-duck-eye: #514538;
  --entry-duck-cheek: #e79e87;
  --entry-duck-mouth: #b77940;
}

html.dark {
  --entry-bg: #0f0f0f;
  --entry-ink: #d5d7df;
  --entry-track: #2c2e35;
  --entry-accent: #7886a5;
}

html.entry-loading {
  background: var(--entry-bg);
  overflow: hidden;
}

html.entry-loading body {
  overflow: hidden;
}

html.entry-loading #app {
  visibility: hidden;
}

#entry-loader {
  position: fixed;
  inset: 0;
  z-index: 2147483000;
  display: grid;
  place-items: center;
  overflow: hidden;
  background: var(--entry-bg);
  color: var(--entry-ink);
  font-family: Avenir, "PingFang SC", "Microsoft YaHei", sans-serif;
  transition: opacity 380ms ease, visibility 380ms;
}

.entry-loader-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 36px;
  width: 100%;
  transform: translateY(-12px);
  animation: entry-content-reveal 420ms ease-out both;
  transition: transform 380ms ease;
}

.entry-loader-name {
  min-height: 1.6em;
  max-width: min(80vw, 640px);
  font-size: clamp(25px, 4.5vw, 34px);
  font-weight: 600;
  line-height: 1.6;
  letter-spacing: 0.035em;
  text-align: center;
  overflow-wrap: anywhere;
}

.entry-loader-letter {
  display: inline-block;
  white-space: pre;
  animation: entry-letter-wave var(--entry-wave-duration, 1800ms) ease-in-out infinite;
  animation-delay: var(--letter-delay, 0ms);
}

.entry-loader-progress {
  position: relative;
  width: min(220px, 65vw);
  padding-top: 40px;
}

.entry-loader-track {
  height: 3px;
  overflow: hidden;
  border-radius: 999px;
  background: var(--entry-track);
}

.entry-loader-bar {
  width: 100%;
  height: 100%;
  border-radius: inherit;
  background: var(--entry-accent);
  transform-origin: left center;
  transform: scaleX(0);
  animation: entry-progress-fill 3600ms linear infinite;
}

.entry-loader-duck-travel {
  position: absolute;
  inset: 0 0 3px;
  transform: translateX(0);
  animation: entry-progress-travel 3600ms linear infinite;
}

.entry-loader-duck {
  display: block;
  width: 48px;
  height: 40px;
  overflow: visible;
  color: var(--entry-duck);
  transform: translateX(-50%);
}

.entry-duck-head {
  display: block;
  width: 100%;
  height: 100%;
  transform-origin: 50% 81.25%;
  animation: entry-duck-sway 1800ms ease-in-out infinite;
}

.entry-duck-ripples {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  transform-origin: 50% 97.92%;
  animation: entry-duck-ripples 1400ms ease-in-out infinite;
}

/* 只提升短暂存在的小图层，避免每帧重绘 SVG 内部节点。 */
.entry-loader-bar,
.entry-loader-duck-travel,
.entry-duck-head {
  will-change: transform;
}

.entry-duck-ripples {
  will-change: transform, opacity;
}

#entry-loader.is-leaving {
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
}

#entry-loader.is-leaving .entry-loader-content {
  transform: translateY(-20px);
}

@keyframes entry-content-reveal {
  from { opacity: 0; }
  to { opacity: 1; }
}

@keyframes entry-letter-wave {
  /* 上浮与回落各占半个周期，首尾速度连续，不在基线长时间停顿。 */
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-5px); }
}

@keyframes entry-progress-fill {
  0% { transform: scaleX(0); }
  100% { transform: scaleX(1); }
}

@keyframes entry-progress-travel {
  0% { transform: translateX(0); }
  100% { transform: translateX(100%); }
}

@keyframes entry-duck-sway {
  0%, 100% { transform: rotate(-6deg); }
  50% { transform: translateY(-0.8px) rotate(6deg); }
}

@keyframes entry-duck-ripples {
  0%, 100% { transform: scaleX(0.85); opacity: 0.4; }
  50% { transform: scaleX(1.05); opacity: 0.75; }
}

@media (prefers-reduced-motion: reduce) {
  #entry-loader,
  .entry-loader-content {
    transition-duration: 120ms;
  }

  #entry-loader.is-leaving .entry-loader-content {
    transform: translateY(-12px);
  }

  #entry-loader * {
    animation: none !important;
  }

  .entry-loader-duck-travel {
    transform: translateX(50%);
  }

  .entry-loader-bar {
    transform: scaleX(0.5);
    opacity: 0.6;
  }

  #entry-loader * {
    will-change: auto;
  }
}