<template>
  <div class="not-found">
    <div class="content">
      <div class="code">
        <span class="digit">4</span>
        <span class="digit zero">0</span>
        <span class="digit">4</span>
      </div>
      <div class="divider"></div>
      <p class="message">页面未找到</p>
      <p class="hint">您访问的页面不存在或已被移除</p>
      <button class="btn-back" @click="goBack">返回首页</button>
    </div>
    <div class="grid-bg"></div>
  </div>
</template>

<script>
export default {
  name: 'NotFound',
  methods: {
    goBack() {
      this.$router.push('/login');
    }
  }
}
</script>

<style scoped>
.not-found {
  position: fixed;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: radial-gradient(ellipse at 50% 40%, #0a1628 0%, #050d1a 100%);
  overflow: hidden;
  font-family: 'Helvetica Neue', Arial, sans-serif;
}

.grid-bg {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(59, 130, 246, 0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(59, 130, 246, 0.04) 1px, transparent 1px);
  background-size: 60px 60px;
  pointer-events: none;
}

.content {
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 20px;
}

.code {
  display: flex;
  align-items: center;
  gap: 8px;
}

.digit {
  font-size: 120px;
  font-weight: 800;
  line-height: 1;
  color: transparent;
  background: linear-gradient(180deg, #3b82f6 0%, #1e3a6e 100%);
  -webkit-background-clip: text;
  background-clip: text;
  text-shadow: 0 0 40px rgba(59, 130, 246, 0.3);
  user-select: none;
}

.digit.zero {
  animation: pulse 2.5s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.4; }
}

.divider {
  width: 80px;
  height: 2px;
  background: linear-gradient(90deg, transparent, #3b82f6, transparent);
  border-radius: 1px;
}

.message {
  font-size: 22px;
  font-weight: 600;
  color: #e0e6f1;
  margin: 0;
  letter-spacing: 4px;
}

.hint {
  font-size: 14px;
  color: #758599;
  margin: 0;
}

.btn-back {
  margin-top: 12px;
  padding: 10px 36px;
  font-size: 14px;
  color: #ffffff;
  background: rgba(59, 130, 246, 0.15);
  border: 1px solid rgba(59, 130, 246, 0.4);
  border-radius: 4px;
  cursor: pointer;
  transition: all 0.25s;
  letter-spacing: 2px;
}

.btn-back:hover {
  background: rgba(59, 130, 246, 0.3);
  border-color: rgba(59, 130, 246, 0.7);
  box-shadow: 0 0 20px rgba(59, 130, 246, 0.2);
}

.btn-back:active {
  transform: translateY(1px);
}
</style>
