.about-container {
            max-width: 900px;
            margin: 0 auto;
            padding: 20px;
            display: flex;
            flex-direction: column;
            gap: 30px;
            position: relative;
            z-index: 1;
        }

        .about-header {
            text-align: center;
            margin-bottom: 40px;
        }

        .avatar {
            width: 120px;
            height: 120px;
            border-radius: 50%;
            margin: 0 auto 20px;
            display: block;
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
            transition: transform 0.3s ease;
        }

        .avatar:hover {
            transform: scale(1.05);
        }

        .about-title {
            font-size: 2.5em;
            font-weight: 700;
            color: #2c3e50;
            margin: 0 0 10px 0;
        }

        .about-subtitle {
            font-size: 1.2em;
            color: #7f8c8d;
            margin: 0 0 20px 0;
            font-style: italic;
        }

        .about-description {
            font-size: 1.1em;
            color: #34495e;
            line-height: 1.8;
            text-align: center;
            max-width: 600px;
            margin: 0 auto;
        }

        .about-section {
            margin-bottom: 40px;
        }

        .section-title {
            font-size: 1.8em;
            font-weight: 600;
            color: #2c3e50;
            margin-bottom: 20px;
            padding-bottom: 10px;
            border-bottom: 3px solid #667eea;
            display: inline-block;
        }

        .section-content {
            font-size: 1.1em;
            color: #34495e;
            line-height: 1.8;
        }

        /* 技能标签样式见 common.css（与简历页面共用） */

        .contact-info {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 20px;
            margin-top: 20px;
        }

        .contact-item {
            background: #f8f9fa;
            padding: 20px;
            border-radius: 15px;
            border-left: 4px solid #667eea;
            transition: transform 0.3s ease;
        }

        .contact-item:hover {
            transform: translateX(5px);
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
        }

        .contact-label {
            font-weight: 600;
            color: #2c3e50;
            margin-bottom: 5px;
        }

        .contact-value {
            color: #7f8c8d;
        }

        .contact-value a {
            color: #667eea;
            text-decoration: none;
            transition: color 0.3s ease;
        }

        .contact-value a:hover {
            color: #764ba2;
        }

        .tech-community-card {
            background: #f8f9fa;
            border-radius: 15px;
            padding: 30px;
            border-left: 4px solid #667eea;
            text-align: center;
        }

        .tech-community-name {
            font-size: 1.15em;
            font-weight: 600;
            color: #2c3e50;
            margin-bottom: 10px;
        }

        .tech-community-meta {
            color: #7f8c8d;
            margin-bottom: 20px;
        }

        .tech-community-link {
            display: inline-block;
            margin-bottom: 24px;
            color: #667eea;
            text-decoration: none;
            font-weight: 500;
            transition: color 0.3s ease;
        }

        .tech-community-link:hover {
            color: #764ba2;
        }

        .tech-community-qr {
            max-width: 280px;
            width: 100%;
            border-radius: 12px;
            box-shadow: 0 8px 24px rgba(0, 0, 0, 0.1);
        }

        .tech-community-hint {
            margin-top: 16px;
            color: #95a5a6;
            font-size: 0.95em;
        }

        .timeline {
            position: relative;
            padding-left: 30px;
        }

        .timeline::before {
            content: '';
            position: absolute;
            left: 15px;
            top: 0;
            bottom: 0;
            width: 2px;
            background: linear-gradient(to bottom, #667eea, #764ba2);
        }

        .timeline-item {
            position: relative;
            margin-bottom: 30px;
            padding-left: 30px;
        }

        .timeline-item::before {
            content: '';
            position: absolute;
            left: -23px;
            top: 5px;
            width: 12px;
            height: 12px;
            border-radius: 50%;
            background: #667eea;
            box-shadow: 0 0 0 4px white, 0 0 0 6px #667eea;
        }

        .timeline-date {
            font-weight: 600;
            color: #667eea;
            margin-bottom: 5px;
        }

        .timeline-title {
            font-weight: 600;
            color: #2c3e50;
            margin-bottom: 5px;
        }

        .timeline-description {
            color: #7f8c8d;
            line-height: 1.6;
        }

        @media (max-width: 768px) {
            .nav-buttons {
                top: 15px;
                left: 15px;
                gap: 8px;
            }

            .nav-button {
                padding: 8px 14px;
                font-size: 0.8em;
            }

            .about-container {
                padding: 15px;
                gap: 20px;
            }

            .about-card {
                padding: 25px;
            }

            .about-title {
                font-size: 2em;
            }

            .about-subtitle {
                font-size: 1em;
            }

            .section-title {
                font-size: 1.5em;
            }

            .contact-info {
                grid-template-columns: 1fr;
                gap: 15px;
            }

            .timeline {
                padding-left: 20px;
            }

            .timeline-item {
                padding-left: 20px;
            }
        }