:root {
            --bg: #ffffff;
            --surface: #f7f7f5;
            --surface-strong: #f1f1ee;
            --text: #222222;
            --text-soft: #666666;
            --text-muted: #8b8b86;
            --border: #e8e8e4;
            --border-strong: #d9d9d3;
            --accent: #8a6f52;
            --accent-dark: #725a42;
            --max-width: 1080px;
        }

        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }

        html {
            scroll-behavior: auto;
        }

        body {
            background: var(--bg);
            color: var(--text);
            font-family:
                -apple-system,
                BlinkMacSystemFont,
                "Segoe UI",
                "PingFang SC",
                "Hiragino Sans GB",
                "Microsoft YaHei",
                Arial,
                sans-serif;
            line-height: 1.8;
            font-size: 15px;
        }

        a {
            color: inherit;
            text-decoration: none;
        }

        .page {
            width: min(calc(100% - 40px), var(--max-width));
            margin: 0 auto;
        }

        /* 顶部 */
        .site-header {
            padding: 24px 0;
            border-bottom: 1px solid var(--border);
        }

        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 20px;
        }

        .site-name {
            font-size: 14px;
            letter-spacing: 0.08em;
            color: var(--text-soft);
        }

        .back-home {
            font-size: 13px;
            color: var(--text-muted);
            transition: color 0.2s ease;
        }

        .back-home:hover {
            color: var(--text);
        }

        /* 主体 */
        .about-main {
            padding: 80px 0 100px;
        }

        .hero {
            display: grid;
            grid-template-columns: 150px 1fr;
            gap: 46px;
            align-items: center;
            padding-bottom: 64px;
            border-bottom: 1px solid var(--border);
        }

        /* 圆形头像预留框 */
        .avatar-placeholder {
            width: 150px;
            height: 150px;
            border-radius: 50%;
            border: 1px solid var(--border-strong);
            background:
                linear-gradient(
                    135deg,
                    #fafaf8 0%,
                    #f3f2ee 100%
                );
            display: flex;
            align-items: center;
            justify-content: center;
            position: relative;
            overflow: hidden;
        }

        .hero-label {
            font-size: 12px;
            letter-spacing: 0.18em;
            color: var(--text-muted);
            margin-bottom: 14px;
        }

        .hero-title {
            font-size: clamp(34px, 5vw, 54px);
            line-height: 1.2;
            font-weight: 600;
            letter-spacing: -0.04em;
            margin-bottom: 20px;
        }

        .developer-name {
            display: inline-block;
            padding-bottom: 7px;
            border-bottom: 1px solid var(--text);
            font-size: 16px;
            color: var(--text);
            margin-bottom: 20px;
        }

        .hero-description {
            max-width: 700px;
            color: var(--text-soft);
            font-size: 15px;
        }

        /* 内容区域 */
        .content-grid {
            display: grid;
            grid-template-columns: 1.45fr 0.8fr;
            gap: 70px;
            padding-top: 64px;
        }

        .section {
            margin-bottom: 64px;
        }

        .section:last-child {
            margin-bottom: 0;
        }

        .section-title {
            font-size: 14px;
            font-weight: 600;
            letter-spacing: 0.08em;
            margin-bottom: 22px;
            color: var(--text);
        }

        .section-title span {
            color: var(--text-muted);
            font-weight: 400;
            margin-right: 9px;
        }

        .section p {
            color: var(--text-soft);
            margin-bottom: 18px;
        }

        .section p:last-child {
            margin-bottom: 0;
        }

        /* 信息卡片 */
        .info-list {
            border-top: 1px solid var(--border);
        }

        .info-item {
            display: grid;
            grid-template-columns: 120px 1fr;
            gap: 18px;
            padding: 17px 0;
            border-bottom: 1px solid var(--border);
        }

        .info-label {
            color: var(--text-muted);
            font-size: 13px;
        }

        .info-value {
            color: var(--text);
            font-size: 14px;
            word-break: break-word;
        }

        .info-value a {
            color: var(--accent-dark);
            border-bottom: 1px solid transparent;
            transition: border-color 0.2s ease;
        }

        .info-value a:hover {
            border-bottom-color: var(--accent-dark);
        }

        /* 站点介绍 */
        .note {
            margin-top: 26px;
            padding: 24px 26px;
            background: var(--surface);
            border-left: 2px solid var(--border-strong);
            color: var(--text-soft);
            font-size: 14px;
        }

        /* 按钮 */
        .action-area {
            display: flex;
            align-items: center;
            gap: 12px;
            margin-top: 30px;
            flex-wrap: wrap;
        }

        .action-button {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            min-height: 44px;
            padding: 0 22px;
            border: 1px solid var(--border-strong);
            background: #ffffff;
            color: var(--text);
            font-size: 13px;
            cursor: pointer;
            transition:
                background 0.2s ease,
                border-color 0.2s ease,
                color 0.2s ease;
        }

        .action-button:hover {
            background: var(--surface);
            border-color: #c8c8c2;
        }

        .action-button.primary {
            background: var(--text);
            border-color: var(--text);
            color: #ffffff;
        }

        .action-button.primary:hover {
            background: #333333;
            border-color: #333333;
        }

        /* 页面底部 */
        .site-footer {
            padding: 28px 0 34px;
            border-top: 1px solid var(--border);
            color: var(--text-muted);
            font-size: 12px;
        }

        .footer-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 20px;
        }

        /* 响应式 */
        @media (max-width: 820px) {
            .about-main {
                padding: 54px 0 74px;
            }

            .hero {
                grid-template-columns: 1fr;
                gap: 28px;
            }

            .avatar-placeholder {
                width: 118px;
                height: 118px;
                margin-top: 16px;
            }

            .content-grid {
                grid-template-columns: 1fr;
                gap: 0;
                padding-top: 52px;
            }
        }

        @media (max-width: 560px) {
            .page {
                width: min(calc(100% - 28px), var(--max-width));
            }

            .site-header {
                padding: 20px 0;
            }

            .hero-title {
                font-size: 34px;
            }

            .info-item {
                grid-template-columns: 92px 1fr;
                gap: 12px;
            }

            .footer-inner {
                flex-direction: column;
                align-items: flex-start;
            }

            .action-button {
                width: 100%;
            }
        }
            html.dark {
            --bg: #14161a;
            --surface: #1b1e24;
            --surface-strong: #22262d;
            --text: #e9e6df;
            --text-soft: #b9b6ae;
            --text-muted: #8f8c84;
            --border: #2a2f37;
            --border-strong: #3a3f47;
            --accent: #a8896a;
            --accent-dark: #c09a76;
        }

        html.dark .action-button {
            background: var(--surface);
        }

        html.dark .action-button.primary {
            background: var(--text);
            color: #14161a;
        }

        html.dark .action-button.primary:hover {
            background: #d0cdc6;
            border-color: #d0cdc6;
        }

        html.dark .avatar-placeholder {
            background: linear-gradient(135deg, #23262c 0%, #1b1e24 100%);
        }

        .theme-toggle {
            position: fixed;
            right: 18px;
            bottom: 18px;
            z-index: 999;

            width: 42px;
            height: 42px;

            display: flex;
            align-items: center;
            justify-content: center;

            border: 1px solid var(--border);
            border-radius: 50%;

            background: var(--surface);
            color: var(--text);

            cursor: pointer;

            transition: background 0.15s ease, border-color 0.15s ease;
        }

        .theme-toggle:hover {
            background: var(--surface-strong);
        }

        .theme-toggle svg {
            width: 19px;
            height: 19px;

            stroke: currentColor;
            fill: none;
            stroke-width: 1.8;
            stroke-linecap: round;
            stroke-linejoin: round;
        }

        .theme-toggle .i-sun {
            display: none;
        }

        html.dark .theme-toggle .i-sun {
            display: block;
        }

        html.dark .theme-toggle .i-moon {
            display: none;
        }