<template>
  <div class="login-page" @mousemove="handleMouseMove">
    <div class="login-container">
      <!-- 浮動(dòng)裝飾圖標(biāo) -->
      <div class="floating-icons">
        <span 
          v-for="(icon, index) in icons" 
          :key="index" 
          :style="{
            left: icon.left + 'px',
            top: icon.top + 'px',
            width: icon.size + 'px',
            height: icon.size + 'px',
            animationDuration: (10 + Math.random() * 20) + 's',
            animationDelay: (Math.random() * 5) + 's'
          }"
        ></span>
      </div>

      <!-- 標(biāo)題 -->
      <h2>歡迎登錄</h2>

      <!-- 登錄表單 -->
      <form @submit.prevent="handleSubmit">
        <!-- 用戶名輸入 -->
        <div class="input-group">
          <input type="text" required v-model="username">
          <label>用戶名</label>
        </div>

        <!-- 密碼輸入 -->
        <div class="input-group">
          <input type="password" required v-model="password">
          <label>密碼</label>
        </div>

        <!-- 登錄按鈕 -->
        <button type="submit" class="btn">登 錄</button>

        <!-- 輔助鏈接 -->
        <div class="links">
          <a href="#" rel="external nofollow"  rel="external nofollow"  @mouseenter="changeBgColor('#a1c4fd')">忘記密碼?</a>
          <a href="#" rel="external nofollow"  rel="external nofollow"  @mouseenter="changeBgColor('#fbc2eb')">注冊(cè)賬號(hào)</a>
        </div>
      </form>
    </div>
  </div>
</template>

<script setup>
import { ref, onMounted } from 'vue';

// 用戶輸入數(shù)據(jù)
const username = ref('');
const password = ref('');

// 浮動(dòng)圖標(biāo)數(shù)據(jù)
const icons = ref([]);

// 生成浮動(dòng)圖標(biāo)
const createIcons = () => {
  const iconsCount = 10;
  const newIcons = [];
  for (let i = 0; i < iconsCount; i++) {
    newIcons.push({
      left: Math.random() * 380,     // 隨機(jī)水平位置
      top: Math.random() * 400,      // 隨機(jī)起始高度
      size: 20 + Math.random() * 30  // 隨機(jī)大?。?0~50px）
    });
  }
  icons.value = newIcons;
};

// 表單提交
const handleSubmit = () => {
  alert(`歡迎, ${username.value}!`);
};

// 鼠標(biāo)懸停鏈接時(shí)改變背景色
const changeBgColor = (color) => {
  document.body.style.background = `linear-gradient(45deg, ${color}, ${color.replace(')', '')}80)`;
};

// 鼠標(biāo)移動(dòng)時(shí)動(dòng)態(tài)改變背景角度
const handleMouseMove = (e) => {
  const x = e.clientX / window.innerWidth; // 0 ~ 1
  const angle = x * 180; // 0 ~ 180deg
  document.body.style.background = `linear-gradient(${angle}deg, #ff9a9e, #fad0c4)`;
};

// 組件掛載后初始化圖標(biāo)
onMounted(() => {
  createIcons();
});
</script>

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

.login-page {
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 100vh;
  background: linear-gradient(45deg, #ff9a9e, #fad0c4);
  transition: background 0.5s ease;
}

.login-container {
  position: relative;
  width: 380px;
  padding: 40px;
  background: rgba(255, 255, 255, 0.15);
  backdrop-filter: blur(10px); /* 毛玻璃效果 */
  border-radius: 20px;
  box-shadow: 0 25px 45px rgba(0, 0, 0, 0.1);
  border: 1px solid rgba(255, 255, 255, 0.2);
  overflow: hidden;
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.login-container:hover {
  transform: translateY(-5px);
  box-shadow: 0 30px 50px rgba(0, 0, 0, 0.15);
}

.login-container::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.4), transparent);
  transition: 0.5s;
}
.login-container:hover::before {
  left: 100%;
}

.input-group input {
  width: 100%;
  padding: 15px 20px;
  background: rgba(255, 255, 255, 0.2);
  border: none;
  outline: none;
  border-radius: 35px;
  color: #fff;
  font-size: 16px;
  box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
  transition: all 0.3s ease;
}

.input-group input:focus, .input-group input:hover {
  background: rgba(255, 255, 255, 0.3);
  box-shadow: 0 8px 20px rgba(0, 0, 0, 0.1);
}

.input-group label {
  position: absolute;
  top: 15px;
  left: 20px;
  color: rgba(255, 255, 255, 0.8);
  pointer-events: none;
  transition: all 0.3s ease;
}

.input-group input:focus + label,
.input-group input:valid + label {
  top: -10px;
  left: 15px;
  font-size: 12px;
  background: rgba(255, 255, 255, 0.2);
  padding: 0 10px;
  border-radius: 10px;
}

.btn {
  width: 100%;
  padding: 15px;
  background: linear-gradient(45deg, #ff9a9e, #fad0c4);
  border: none;
  border-radius: 35px;
  color: #fff;
  font-weight: 600;
  cursor: pointer;
  box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
  transition: all 0.3s ease;
}

.btn:hover {
  transform: translateY(-3px);
  box-shadow: 0 10px 20px rgba(0, 0, 0, 0.2);
}

.btn::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.4), transparent);
  transition: 0.5s;
}

.btn:hover::before {
  left: 100%;
}

.floating-icons {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: -1;
}

.floating-icons span {
  position: absolute;
  display: block;
  width: 40px;
  height: 40px;
  background: rgba(255, 255, 255, 0.1);
  border-radius: 50%;
  animation: float 15s linear infinite;
  opacity: 0;
}

.login-container:hover .floating-icons span {
  opacity: 1;
}

@keyframes float {
  0% {
    transform: translateY(0) rotate(0deg);
    opacity: 1;
  }
  100% {
    transform: translateY(-1000px) rotate(720deg);
    opacity: 0;
  }
}