sub2api/frontend/src/views/NotFoundView.vue

<template>
  <div
    class="relative flex min-h-screen items-center justify-center overflow-hidden bg-gray-50 px-4 dark:bg-dark-950"
  >
    <!-- Background Decoration -->
    <div class="pointer-events-none absolute inset-0 overflow-hidden">
      <div
        class="absolute -right-40 -top-40 h-80 w-80 rounded-full bg-primary-400/10 blur-3xl"
      ></div>
      <div
        class="absolute -bottom-40 -left-40 h-80 w-80 rounded-full bg-primary-500/10 blur-3xl"
      ></div>
    </div>

    <div class="relative z-10 w-full max-w-md text-center">
      <!-- 404 Display -->
      <div class="mb-8">
        <div class="relative inline-block">
          <span class="text-[12rem] font-bold leading-none text-gray-100 dark:text-dark-800"
            >404</span
          >
          <div class="absolute inset-0 flex items-center justify-center">
            <div
              class="flex h-24 w-24 items-center justify-center rounded-2xl bg-gradient-to-br from-primary-500 to-primary-600 shadow-lg shadow-primary-500/30"
            >
              <svg
                class="h-12 w-12 text-white"
                fill="none"
                viewBox="0 0 24 24"
                stroke="currentColor"
                stroke-width="1.5"
              >
                <path
                  stroke-linecap="round"
                  stroke-linejoin="round"
                  d="M12 9v3.75m-9.303 3.376c-.866 1.5.217 3.374 1.948 3.374h14.71c1.73 0 2.813-1.874 1.948-3.374L13.949 3.378c-.866-1.5-3.032-1.5-3.898 0L2.697 16.126zM12 15.75h.007v.008H12v-.008z"
                />
              </svg>
            </div>
          </div>
        </div>
      </div>

      <!-- Text Content -->
      <div class="mb-8">
        <h1 class="mb-3 text-2xl font-bold text-gray-900 dark:text-white">Page Not Found</h1>
        <p class="text-gray-500 dark:text-dark-400">
          The page you are looking for doesn't exist or has been moved.
        </p>
      </div>

      <!-- Action Buttons -->
      <div class="flex flex-col justify-center gap-3 sm:flex-row">
        <button @click="goBack" class="btn btn-secondary">
          <svg
            class="mr-2 h-5 w-5"
            fill="none"
            viewBox="0 0 24 24"
            stroke="currentColor"
            stroke-width="1.5"
          >
            <path
              stroke-linecap="round"
              stroke-linejoin="round"
              d="M10.5 19.5L3 12m0 0l7.5-7.5M3 12h18"
            />
          </svg>
          Go Back
        </button>
        <router-link to="/dashboard" class="btn btn-primary">
          <svg
            class="mr-2 h-5 w-5"
            fill="none"
            viewBox="0 0 24 24"
            stroke="currentColor"
            stroke-width="1.5"
          >
            <path
              stroke-linecap="round"
              stroke-linejoin="round"
              d="M2.25 12l8.954-8.955c.44-.439 1.152-.439 1.591 0L21.75 12M4.5 9.75v10.125c0 .621.504 1.125 1.125 1.125H9.75v-4.875c0-.621.504-1.125 1.125-1.125h2.25c.621 0 1.125.504 1.125 1.125V21h4.125c.621 0 1.125-.504 1.125-1.125V9.75M8.25 21h8.25"
            />
          </svg>
          Go to Dashboard
        </router-link>
      </div>

      <!-- Help Link -->
      <p class="mt-8 text-sm text-gray-400 dark:text-dark-500">
        Need help?
        <a
          href="#"
          class="text-primary-600 transition-colors hover:text-primary-500 dark:text-primary-400 dark:hover:text-primary-300"
        >
          Contact support
        </a>
      </p>
    </div>
  </div>
</template>

<script setup lang="ts">
import { useRouter } from 'vue-router'

const router = useRouter()

function goBack(): void {
  router.back()
}
</script>