<!DOCTYPE html>
<html lang="zh-CN">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=5.0">
    <title>404 - 页面未找到</title>
    <style>
        :root {
            --primary: #e74c3c;
            --link: #3498db;
            --bg: #f0f8ff;
        }

        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }

        body {
            font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
            background: var(--bg);
            color: #222;
            min-height: 100vh;
            display: grid;
            place-items: center;
            padding: 1rem;
            line-height: 1.6;
        }

        .container {
            max-width: 32rem;
            width: 100%;
            background: rgba(255, 255, 255, 0.92);
            border-radius: 1rem;
            padding: clamp(1.5rem, 5vw, 2.5rem);
            box-shadow: 0 10px 25px rgba(0,0,0,0.12);
            text-align: center;
        }

        h1 {
            font-size: clamp(5rem, 25vw, 9rem);
            font-weight: 700;
            color: var(--primary);
            line-height: 0.9;
            margin-bottom: 0.8rem;
        }

        .emoji {
            font-size: clamp(3rem, 12vw, 5rem);
            vertical-align: middle;
        }

        .main-text {
            font-size: clamp(1.25rem, 5vw, 1.5rem);
            margin: 1rem 0 1.5rem;
            font-weight: 500;
        }

        .sub-text {
            font-size: clamp(1rem, 4vw, 1.125rem);
            color: #555;
            margin-bottom: 2rem;
        }

        .btn {
            display: inline-block;
            padding: 0.9rem 2rem;
            font-size: clamp(1.1rem, 4.5vw, 1.25rem);
            font-weight: 600;
            color: white;
            background: var(--link);
            border-radius: 0.75rem;
            text-decoration: none;
            transition: all 0.2s;
            touch-action: manipulation;
        }

        .btn:hover,
        .btn:focus {
            background: #2980b9;
            transform: translateY(-2px);
            box-shadow: 0 6px 15px rgba(52, 152, 219, 0.3);
        }

        @media (max-width: 480px) {
            .container {
                padding: 1.5rem;
            }
            .btn {
                width: 100%;
                padding: 1rem;
            }
        }

        @media (prefers-reduced-motion: reduce) {
            * { transition: none !important; transform: none !important; }
        }
    </style>
</head>
<body>
    <div class="container">
        <h1>404 <span class="emoji">😕</span></h1>
        
        <div class="main-text">页面跑丢了…</div>
        
        <div class="sub-text">
            你访问的页面可能被移走、改名了，<br>或者它压根儿就没来过这个网站。
        </div>

        <a href="/" class="btn">回到首页</a>
    </div>
</body>
</html>