/* ===== 全局样式（浅色） ===== */
body {
  font-family: "Segoe UI", sans-serif;
  margin: 0;
  padding: 0;

  /* --- 居中布局 --- */
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh;

  background: #f5f5f7;
  color: #222;
  transition: background 0.3s, color 0.3s;
}

/* 深色模式 */
@media (prefers-color-scheme: dark) {
  body {
    background: #111;
    color: #eee;
  }
}

/* ===== 居中主容器（卡片） ===== */
.container {
  text-align: center;
  background: white;
  padding: 40px;
  border-radius: 16px;
  width: 420px;
  box-shadow: 0 4px 18px rgba(0,0,0,0.12);
  animation: fadeIn 0.4s ease-out;
}

@media (prefers-color-scheme: dark) {
  .container {
    background: #1a1a1a;
    box-shadow: 0 4px 18px rgba(255,255,255,0.07);
  }
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(10px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* ===== 顶部 Logo（自动生成一个简洁圆形 Logo） ===== */
body::before {
  content: "PDF→DOCX";
  position: absolute;
  top: 20px;
  font-weight: bold;
  font-size: 20px;
  display: inline-block;
  padding: 10px 18px;
  background: #0057ff;
  color: white;
  border-radius: 12px;
  box-shadow: 0 4px 12px rgba(0,0,0,0.2);
}

/* ===== 标题 ===== */
h1 {
  margin-top: 10px;
  font-size: 28px;
}

/* ===== 文件选择框美化 ===== */
input[type="file"] {
  padding: 12px;
  border: 2px dashed #999;
  border-radius: 10px;
  background: rgba(255,255,255,0.7);
  cursor: pointer;
  margin-top: 18px;
  transition: 0.25s;
  width: 100%;
}

input[type="file"]:hover {
  border-color: #0057ff;
}

/* 深色模式 */
@media (prefers-color-scheme: dark) {
  input[type="file"] {
    background: rgba(30,30,30,0.8);
    border-color: #666;
  }
}

/* ===== 转换按钮 ===== */
button {
  padding: 12px 22px;
  background: #0057ff;
  color: white;
  border: none;
  border-radius: 12px;
  font-size: 16px;
  cursor: pointer;
  margin-top: 12px;
  box-shadow: 0 4px 12px rgba(0,0,0,0.15);
  transition: transform 0.2s, background 0.3s;
}

button:hover {
  background: #003fcc;
  transform: translateY(-2px);
}

/* ===== 日志区域（转换历史） ===== */
#log {
  margin-top: 30px;
  padding: 20px;
  background: rgba(255,255,255,0.8);
  border-radius: 14px;
  min-height: 120px;
  border: 1px solid #ddd;
  font-size: 15px;
  white-space: pre-wrap;
  line-height: 1.6;
  transition: background 0.3s;
}

/* 深色模式 */
@media (prefers-color-scheme: dark) {
  #log {
    background: rgba(20,20,20,0.8);
    border-color: #444;
  }
}

/* ===== 进度条（利用伪元素自动出现） ===== */
#log.loading::before {
  content: "";
  display: block;
  height: 6px;
  width: 100%;
  background: linear-gradient(90deg, #0057ff, #80aaff);
  border-radius: 4px;
  margin-bottom: 10px;

  /* 动画 */
  animation: loadingBar 1.5s infinite linear;
}

@keyframes loadingBar {
  0%   { background-position: 0 0; }
  100% { background-position: 300px 0; }
}

/* ===== 历史记录条目美化 ===== */
#log span.entry {
  display: block;
  padding: 6px 0;
  border-bottom: 1px dashed #ccc;
  opacity: 0;
  animation: fadeUp 0.4s forwards;
}

@keyframes fadeUp {
  from { opacity: 0; transform: translateY(6px); }
  to   { opacity: 1; transform: translateY(0); }
}