:root {
  --theme: #6366f1;
  --radius: 28px;
  --height: 56px;
  --maxW: 640px;
  
  /* 浅色模式变量 */
  --bg-color: #f7f8fc;
  --text-color: #333;
  --input-bg: #fff;
  --input-border: #e0e0e0;
  --placeholder-color: #999;
  --shadow-color: rgba(0, 0, 0, 0.15);
  --mode-icon: "\f186"; /* 月亮图标 */
}

/* 深色模式变量 */
[data-theme="dark"] {
  --bg-color: #121212;
  --text-color: #e0e0e0;
  --input-bg: #1e1e1e;
  --input-border: #333;
  --placeholder-color: #888;
  --shadow-color: rgba(0, 0, 0, 0.4);
  --mode-icon: "\f185"; /* 太阳图标 */
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", sans-serif;
  transition: background-color 0.3s, color 0.3s;
}

body {
  height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-color);
  color: var(--text-color);
}

/* 去掉 WebKit 自带的清除按钮 */
input[type="search"]::-webkit-search-cancel-button { display: none; }

#search-wrapper {
  position: relative;
  width: 90%;
  max-width: var(--maxW);
}

#searchInput {
  width: 100%;
  height: var(--height);
  padding: 0 100px 0 24px;
  font-size: 18px;
  background: var(--input-bg);
  color: var(--text-color);
  border: 1px solid var(--input-border);
  border-radius: var(--radius);
  outline: none;
  transition: border-color .25s;
}

#searchInput:focus {
  border-color: var(--theme);
}

#searchInput::placeholder {
  color: var(--placeholder-color);
  transition: opacity .3s;
}

#searchInput:focus::placeholder {
  opacity: .35;
}

#searchBtn {
  position: absolute;
  right: 6px;
  top: 50%;
  transform: translateY(-50%);
  width: 44px;
  height: 44px;
  border: none;
  border-radius: 50%;
  background: var(--theme);
  color: #fff;
  font-size: 18px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 2px 5px var(--shadow-color);
  transition: transform .2s;
}

#searchBtn:hover {
  transform: translateY(-50%) scale(1.05);
}

#searchBtn:active {
  transform: translateY(-50%) scale(.95);
}

#themeToggle {
  position: absolute;
  right: 56px;
  top: 50%;
  transform: translateY(-50%);
  width: 40px;
  height: 40px;
  border: none;
  border-radius: 50%;
  background: transparent;
  color: var(--text-color);
  font-size: 18px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background-color 0.3s;
}

#themeToggle:hover {
  background: rgba(0, 0, 0, 0.05);
}

[data-theme="dark"] #themeToggle:hover {
  background: rgba(255, 255, 255, 0.1);
}

#themeToggle::before {
  content: var(--mode-icon);
  font-family: "Font Awesome 6 Free";
  font-weight: 900;
}