:root {
            --primary-color: #1a1a1a;
            --secondary-color: #666;
            --accent-color: #007AFF;
            --border-color: #f0f0f0;
            --bg-color: #ffffff;
            --footer-bg: #fafafa;
        }
        [data-theme='dark'] {
            --primary-color: #f0f0f0;
            --secondary-color: #a0a0a0;
            --accent-color: #0A84FF;
            --border-color: #333;
            --bg-color: #121212;
            --footer-bg: #1a1a1a;
        }
        body {
            font-family: 'Inter', sans-serif;
            color: var(--primary-color);
            background-color: var(--bg-color);
            margin: 0;
            display: flex;
            flex-direction: column;
            min-height: 100vh;
            transition: background-color 0.3s ease, color 0.3s ease;
        }
        main { flex: 1; display: flex; align-items: center; justify-content: center; padding: 40px 20px; }
        .container { max-width: 600px; width: 100%; }
        h1 { font-size: clamp(2.5rem, 8vw, 3.5rem); font-weight: 700; letter-spacing: -0.04em; margin-bottom: 30px; background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%); -webkit-background-clip: text; -webkit-text-fill-color: transparent; }
        h2 { font-size: 0.85rem; text-transform: uppercase; color: var(--secondary-color); margin: 30px 0 10px; }
        p { font-size: 1.1rem; margin-bottom: 10px; }
        a { color: var(--accent-color); text-decoration: none; }
        footer { border-top: 1px solid var(--border-color); padding: 20px; background-color: var(--footer-bg); }
        .footer-content { max-width: 1000px; margin: 0 auto; display: flex; justify-content: space-between; align-items: center; font-size: 0.9rem; color: var(--secondary-color); }
        .footer-links { display: flex; align-items: center; }
        .footer-links a, .theme-toggle { color: var(--secondary-color); text-decoration: none; margin-left: 20px; cursor: pointer; background: none; border: none; display: flex; align-items: center; }
        .footer-links a:hover, .theme-toggle:hover {
            color: var(--accent-color);
        }