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

html,
body {
  width: 100%;
  height: 100%;
  overflow: hidden;
  font-family: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
  background: #f5f5f5;
}

.hidden {
  visibility: hidden;
  pointer-events: none;
}

/* ========== 加载页 ========== */
.loader {
  position: fixed;
  inset: 0;
  z-index: 9999;
  display: flex;
  align-items: center;
  justify-content: center;
  background: #fff;
  transition: opacity 0.6s ease, visibility 0.6s ease;
}

.loader.fade-out {
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
}

.loader__inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 36px;
  padding: 0 40px;
}

.loader__logo {
  width: 160px;
  height: 160px;
  object-fit: contain;
  animation: logoPulse 2s ease-in-out infinite;
}

.loader__bar-wrap {
  width: 200px;
  height: 3px;
  background: #e8edf5;
  border-radius: 2px;
  overflow: hidden;
}

.loader__bar {
  width: 0%;
  height: 100%;
  background: linear-gradient(90deg, #1a5fc7, #2b7de9);
  border-radius: 2px;
  transition: width 0.15s ease;
}

@keyframes logoPulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.85; transform: scale(0.98); }
}

/* ========== 主页面 ========== */
.app {
  width: 100%;
  max-width: 480px;
  height: 100%;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  background: #fff;
  position: relative;
  overflow: hidden;
}

.main {
  flex: 1;
  position: relative;
  overflow: hidden;
  height: 100%;
}

.main__bg {
  position: absolute;
  inset: 0;
  background: url("../2.jpg") center center / cover no-repeat;
  z-index: 0;
}

.main__overlay {
  display: none;
}

.main__content {
  position: relative;
  z-index: 2;
  height: 100%;
  pointer-events: none;
}

.pdf-list {
  position: absolute;
  left: 16px;
  right: 16px;
  top: 54%;
  display: flex;
  flex-direction: column;
  gap: 16px;
  pointer-events: auto;
}

.pdf-card {
  display: flex;
  align-items: center;
  gap: 10px;
  width: 100%;
  padding: 14px 16px;
  background: rgba(255, 255, 255, 0.18);
  border: 1px solid rgba(255, 255, 255, 0.35);
  border-radius: 4px;
  text-decoration: none;
  color: #fff;
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  transition: background 0.25s ease, transform 0.25s ease;
}

.pdf-card:active {
  background: rgba(255, 255, 255, 0.28);
  transform: scale(0.98);
}

.pdf-card__icon {
  flex-shrink: 0;
  display: flex;
  align-items: center;
}

.pdf-card__name {
  flex: 1;
  font-size: 14px;
  line-height: 1.4;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.pdf-card__download {
  flex-shrink: 0;
  display: flex;
  align-items: center;
}

/* 底部 */
.footer {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  z-index: 5;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 16px 16px;
}

.footer__report {
  display: flex;
  align-items: center;
  gap: 4px;
  padding: 6px 12px;
  background: rgba(0, 0, 0, 0.35);
  border: none;
  border-radius: 20px;
  color: rgba(255, 255, 255, 0.85);
  font-size: 12px;
  cursor: pointer;
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
}

.footer__page {
  font-size: 12px;
  color: rgba(255, 255, 255, 0.7);
}

/* ========== 渐入动画 ========== */
.fade-item {
  opacity: 0;
  transform: translateY(20px);
}

.fade-item.show {
  animation: fadeInUp 0.8s ease forwards;
  animation-delay: var(--delay, 0s);
}

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

/* 桌面端居中展示 */
@media (min-width: 481px) {
  body {
    display: flex;
    align-items: center;
    justify-content: center;
    background: #e8e8e8;
  }

  .app {
    height: 90vh;
    max-height: 860px;
    border-radius: 12px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.15);
  }
}