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frontend/templates/404.html

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+{% extends "base.html" %}
+
+{% block title %}Page Not Found - Weibo-HotSign{% endblock %}
+
+{% block content %}
+<div style="text-align: center; padding: 60px 20px;">
+    <h1 style="font-size: 48px; color: #6366f1; margin-bottom: 20px;">404</h1>
+    <p style="font-size: 24px; color: #333; margin-bottom: 20px;">Page Not Found</p>
+    <p style="color: #999; margin-bottom: 30px;">The page you're looking for doesn't exist.</p>
+    <a href="{{ url_for('dashboard') }}" class="btn btn-primary">Go to Dashboard</a>
+</div>
+{% endblock %}