/* ============================================
   加载动画: 翻牌式 LOADING
   ============================================ */

@import url(https://fonts.googleapis.com/css?family=Roboto+Condensed);

/* 浅色模式变量 */
:root {
  --loading-bg: #000;
  --loading-text: #fff;
  --loading-card-bg: linear-gradient(180deg, #222 0, #444 100%);
  --loading-card-border-left: #444;
  --loading-card-border-right: #222;
  --loading-cover-bg: linear-gradient(180deg, white 0, #ddd 100%);
  --loading-hint-bg: rgba(255, 255, 255, 0.05);
  --loading-hint-border: rgba(255, 255, 255, 0.1);
  --loading-hint-text: rgba(255, 255, 255, 0.7);
  --loading-slow-text: rgba(255, 255, 255, 0.5);
  --loading-countdown: rgba(255, 255, 255, 0.3);
}

@media (prefers-color-scheme: light) {
  :root {
    --loading-bg: #f5f5f5;
    --loading-text: #333;
    --loading-card-bg: linear-gradient(180deg, #e0e0e0 0, #c0c0c0 100%);
    --loading-card-border-left: #d0d0d0;
    --loading-card-border-right: #a0a0a0;
    --loading-cover-bg: linear-gradient(180deg, #fff 0, #f0f0f0 100%);
    --loading-hint-bg: rgba(0, 0, 0, 0.05);
    --loading-hint-border: rgba(0, 0, 0, 0.1);
    --loading-hint-text: rgba(0, 0, 0, 0.7);
    --loading-slow-text: rgba(0, 0, 0, 0.5);
    --loading-countdown: rgba(0, 0, 0, 0.3);
  }
}

#loading-screen {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: var(--loading-bg);
  z-index: 99999;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  transition: opacity 0.6s ease, visibility 0.6s ease;
  clip-path: circle(150% at 50% 50%);
}

#loading-screen.shrink-out {
  animation: shrinkToCenter 0.8s cubic-bezier(0.7, 0, 0.3, 1) forwards;
}

@keyframes shrinkToCenter {
  0% {
    clip-path: circle(150% at 50% 50%);
  }
  100% {
    clip-path: circle(0% at 50% 50%);
  }
}

#loading-screen.hidden {
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
}

/* 内容容器 */
.loading-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  transition: opacity 0.4s ease, transform 0.4s ease;
  padding: 20px;
}

.loading-content.fade-out {
  opacity: 0;
  transform: scale(0.9);
}

/* ============================================
   站点大标题
   ============================================ */
.loading-site-title {
  font-size: 52px;
  font-weight: 900;
  color: var(--loading-text);
  margin-bottom: 50px;
  letter-spacing: 8px;
  text-shadow:
          0 0 20px rgba(128, 128, 128, 0.3),
          0 0 40px rgba(128, 128, 128, 0.2);
  animation: titlePulse 3s ease-in-out infinite;
}

@keyframes titlePulse {
  0%, 100% {
    text-shadow:
            0 0 20px rgba(128, 128, 128, 0.3),
            0 0 40px rgba(128, 128, 128, 0.2);
    transform: scale(1);
  }
  50% {
    text-shadow:
            0 0 30px rgba(128, 128, 128, 0.5),
            0 0 60px rgba(128, 128, 128, 0.3);
    transform: scale(1.02);
  }
}

/* 浅色模式标题发光 */
@media (prefers-color-scheme: light) {
  .loading-site-title {
    text-shadow:
            0 0 20px rgba(0, 0, 0, 0.1),
            0 0 40px rgba(0, 0, 0, 0.05);
  }

  @keyframes titlePulse {
    0%, 100% {
      text-shadow:
              0 0 20px rgba(0, 0, 0, 0.1),
              0 0 40px rgba(0, 0, 0, 0.05);
    }
    50% {
      text-shadow:
              0 0 30px rgba(0, 0, 0, 0.15),
              0 0 60px rgba(0, 0, 0, 0.1);
    }
  }
}

/* ============================================
   翻牌式 LOADING 动画
   ============================================ */
.flip-loading {
  position: relative;
  margin: 0 auto 50px;
  width: 350px;
  color: white;
  font-family: "Roboto Condensed", sans-serif;
  font-size: 250%;
  background: var(--loading-card-bg);
  box-shadow: inset 0 5px 20px rgba(0,0,0,0.5);
  text-shadow: 5px 5px 5px rgba(0,0,0,0.3);
}

.flip-loading:after {
  content: "";
  display: table;
  clear: both;
}

.flip-loading > span {
  float: left;
  height: 100px;
  line-height: 100px;
  width: 50px;
  border-left: 1px solid var(--loading-card-border-left);
  border-right: 1px solid var(--loading-card-border-right);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 400;
}

.flip-covers {
  position: absolute;
  height: 100%;
  width: 100%;
  top: 0;
  left: 0;
}

.flip-covers span {
  float: left;
  height: 100px;
  line-height: 100px;
  width: 50px;
  background: var(--loading-cover-bg);
  animation: flipUp 2s infinite;
}

@keyframes flipUp {
  0%   { margin-bottom: 0; }
  16%  { margin-bottom: 100%; height: 20px; }
  50%  { margin-bottom: 0; }
  100% { margin-bottom: 0; }
}

.flip-covers span:nth-child(1) { animation-delay: 0s; }
.flip-covers span:nth-child(2) { animation-delay: .142857s; }
.flip-covers span:nth-child(3) { animation-delay: .285714s; }
.flip-covers span:nth-child(4) { animation-delay: .428571s; }
.flip-covers span:nth-child(5) { animation-delay: .571428s; }
.flip-covers span:nth-child(6) { animation-delay: .714285s; }
.flip-covers span:nth-child(7) { animation-delay: .857142s; }

/* ============================================
   提示信息 + 发光灯泡
   ============================================ */
.loading-hint {
  display: flex;
  align-items: center;
  gap: 12px;
  max-width: 550px;
  padding: 16px 24px;
  background: var(--loading-hint-bg);
  border: 1px solid var(--loading-hint-border);
  border-radius: 12px;
  margin-bottom: 24px;
}

.hint-icon {
  width: 28px;
  height: 28px;
  flex-shrink: 0;
  color: #ffd700;
  animation: bulbGlow 2s ease-in-out infinite alternate;
  filter: drop-shadow(0 0 5px rgba(255, 215, 0, 0.5));
}

.hint-icon svg {
  width: 100%;
  height: 100%;
}

@keyframes bulbGlow {
  from {
    filter: drop-shadow(0 0 5px rgba(255, 215, 0, 0.5));
    opacity: 0.8;
  }
  to {
    filter: drop-shadow(0 0 15px rgba(255, 215, 0, 0.9))
    drop-shadow(0 0 30px rgba(255, 215, 0, 0.6));
    opacity: 1;
  }
}

.hint-text {
  font-size: 15px;
  color: var(--loading-hint-text);
  line-height: 1.6;
  letter-spacing: 0.5px;
}

.hint-label {
  color: #ffd700;
  font-weight: 600;
  font-size: 16px;
}

/* ============================================
   慢速提示文字
   ============================================ */
.loading-slow-hint {
  font-size: 13px;
  color: var(--loading-slow-text);
  letter-spacing: 2px;
  opacity: 0;
  transform: translateY(10px);
  transition: all 0.5s ease;
  margin-top: 8px;
}

.loading-slow-hint.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ============================================
   倒计时显示
   ============================================ */
.loading-countdown {
  font-size: 12px;
  color: var(--loading-countdown);
  margin-top: 12px;
  font-family: monospace;
  letter-spacing: 2px;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.3s ease;
}

.loading-countdown.show {
  opacity: 0;
  visibility: hidden;
}

/* ============================================
   加载完成动画 - 苹果风格（极速版）
   ============================================ */
.loading-complete {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.5s ease, visibility 0.5s ease;
}

.loading-complete.show {
  opacity: 1;
  visibility: visible;
}

.complete-circle {
  width: 100px;
  height: 100px;
  margin-bottom: 30px;
  position: relative;
}

.circle-svg {
  width: 100%;
  height: 100%;
  transform: rotate(-90deg);
}

/* 背景圆环 */
.circle-bg {
  fill: none;
  stroke: var(--loading-hint-border);
  stroke-width: 3;
}

/* 进度圆环 - 绘制动画 */
.circle-progress {
  fill: none;
  stroke: #4CAF50;
  stroke-width: 3;
  stroke-linecap: round;
  stroke-dasharray: 283;
  stroke-dashoffset: 283;
  transition: stroke-dashoffset 0.6s ease-out;
}

.circle-progress.animate {
  stroke-dashoffset: 0;
}

/* 对勾 - 极速绘制版 */
.check-mark {
  fill: none;
  stroke: #4CAF50;
  stroke-width: 5;
  stroke-linecap: round;
  stroke-linejoin: round;
  stroke-dasharray: 60;
  stroke-dashoffset: 60;
  transition: stroke-dashoffset 0.2s ease-out;
  opacity: 0;
  transform: rotate(90deg);
  transform-origin: center;
}

.check-mark.animate {
  stroke-dashoffset: 0;
  opacity: 1;
}

/* 完成时的光晕效果 */
.complete-circle::after {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 100%;
  height: 100%;
  transform: translate(-50%, -50%);
  border-radius: 50%;
  background: radial-gradient(circle, rgba(76, 175, 80, 0.3) 0%, transparent 70%);
  opacity: 0;
  animation: pulseGlow 1s ease-out 0.5s forwards;
}

@keyframes pulseGlow {
  0% {
    opacity: 0;
    transform: translate(-50%, -50%) scale(0.8);
  }
  50% {
    opacity: 1;
    transform: translate(-50%, -50%) scale(1.2);
  }
  100% {
    opacity: 0;
    transform: translate(-50%, -50%) scale(1.5);
  }
}

.complete-text {
  font-size: 50px;
  font-weight: 700;
  color: #4CAF50;
  letter-spacing: 0px;
  opacity: 0;
  transform: translateY(20px);
  transition: all 0.5s ease;
  text-align: center;        /* ← 添加这行：水平居中 */
  width: 100%;               /* ← 添加这行：确保宽度撑满容器 */
  margin: 0 auto;            /* ← 添加这行：自动边距辅助居中 */
}


.complete-text.show {
  opacity: 1;
  transform: translateY(0);
}

/* ============================================
   移动端适配
   ============================================ */
@media (max-width: 768px) {
  .loading-site-title {
    font-size: 36px;
    letter-spacing: 4px;
    margin-bottom: 40px;
  }

  .flip-loading {
    width: 280px;
    font-size: 200%;
  }

  .flip-loading > span,
  .flip-covers span {
    width: 40px;
    height: 80px;
    line-height: 96px;
  }

  .loading-hint {
    padding: 12px 16px;
    max-width: 90%;
    margin-bottom: 20px;
  }

  .hint-icon {
    width: 24px;
    height: 24px;
  }

  .hint-text {
    font-size: 12px;
  }

  .complete-circle {
    width: 80px;
    height: 80px;
  }

  .complete-text {
    font-size: 26px;
    letter-spacing: 6px;
  }
}

@media (max-width: 480px) {
  .loading-site-title {
    font-size: 28px;
    letter-spacing: 3px;
  }

  .flip-loading {
    width: 245px;
    font-size: 175%;
  }

  .flip-loading > span,
  .flip-covers span {
    width: 35px;
    height: 70px;
    line-height: 84px;
  }
}