:root {
            --color-tea-brown: #5D4037;
            --color-rice-white: #F0EAD6;
            --color-grey-green: #708090;
            --color-ink-green: #2F4F4F;
            --color-clay-red: #A0522D;
            --color-paper-white: #FAF9F6;
            
            --font-title: "Noto Serif SC", "Songti SC", "STSong", serif;
            --font-tech: "Courier New", Courier, monospace;
            --font-body: "Noto Serif SC", "Songti SC", serif;
            
            --shadow-soft: 0 4px 20px rgba(93, 64, 55, 0.08);
            --shadow-hover: 0 8px 30px rgba(93, 64, 55, 0.15);
            --transition: all 0.4s cubic-bezier(0.25, 0.8, 0.25, 1);
        }

        * {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
            -webkit-tap-highlight-color: transparent;
        }

        html {
            font-size: 16px;
            -webkit-text-size-adjust: 100%;
        }

        body {
            background-color: var(--color-rice-white);
            background-image: 
                linear-gradient(rgba(93, 64, 55, 0.03) 1px, transparent 1px),
                linear-gradient(90deg, rgba(93, 64, 55, 0.03) 1px, transparent 1px);
            background-size: 40px 40px;
            color: var(--color-tea-brown);
            font-family: var(--font-body);
            line-height: 1.8;
            font-size: 16px;
            overflow-x: hidden;
            width: 100%;
            min-height: 100vh;
        }

        .container {
            width: 100%;
            max-width: 1200px;
            margin: 0 auto;
            padding: 1.5rem;
        }

        /* ========== 头部布局 - 桌面端一排显示 ========== */
        header {
            padding: 3rem 0 2.5rem 0;
            border-bottom: 1px solid rgba(93, 64, 55, 0.12);
            margin-bottom: 4rem;
            position: relative;
            width: 100%;
        }

        .header-left-group {
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 1.5rem;
            flex-wrap: nowrap;
            width: 100%;
            position: relative;
            z-index: 1;
        }

        .header-main {
            display: flex;
            align-items: center;
            gap: 1.5rem;
            flex-shrink: 0;
        }

        .logo-wrapper {
            background-color: var(--color-rice-white);
            background-image: 
                linear-gradient(rgba(93, 64, 55, 0.03) 1px, transparent 1px),
                linear-gradient(90deg, rgba(93, 64, 55, 0.03) 1px, transparent 1px);
            background-size: 40px 40px;
            padding: 0.6rem 0.8rem;
            border-radius: 6px;
            border: 1px solid rgba(93, 64, 55, 0.08);
            transition: var(--transition);
            display: flex;
            align-items: center;
            justify-content: center;
            flex-shrink: 0;
        }

        .logo-wrapper:hover {
            border-color: rgba(93, 64, 55, 0.2);
            box-shadow: 0 4px 15px rgba(93, 64, 55, 0.1);
        }

        .brand-logo {
            height: 45px;
            width: auto;
            object-fit: contain;
            display: block;
            filter: drop-shadow(0 2px 4px rgba(93, 64, 55, 0.15));
        }

        .profile-section {
            display: flex;
            align-items: center;
            gap: 1rem;
            border-left: 1px solid rgba(112, 128, 144, 0.3);
            padding-left: 1.5rem;
            flex-shrink: 0;
        }

        .avatar {
            width: 55px;
            height: 55px;
            border-radius: 50%;
            object-fit: cover;
            border: 2px solid var(--color-rice-white);
            box-shadow: 0 4px 12px rgba(93, 64, 55, 0.15);
            background-color: #fff;
            transition: var(--transition);
        }
        
        .avatar:hover {
            transform: scale(1.05);
            box-shadow: 0 6px 20px rgba(93, 64, 55, 0.25);
        }

        .intro-text {
            display: flex;
            flex-direction: column;
            gap: 0.25rem;
            white-space: nowrap;
        }

        .intro-text h1 {
            font-family: var(--font-title);
            font-size: 1.8rem;
            color: var(--color-tea-brown);
            letter-spacing: 3px;
            font-weight: normal;
            line-height: 1.2;
        }

        .intro-text p {
            font-family: var(--font-tech);
            color: var(--color-grey-green);
            font-size: 0.8rem;
            letter-spacing: 1px;
            line-height: 1.4;
        }

        .intro-text .subtitle {
            font-size: 0.7rem;
            opacity: 0.8;
        }

        .contact-buttons {
            display: flex;
            gap: 0.5rem;
            flex-wrap: nowrap;
            flex-shrink: 0;
            border-left: 1px solid rgba(112, 128, 144, 0.2);
            padding-left: 1.5rem;
        }

        .btn {
            background-color: var(--color-clay-red);
            color: #fff;
            border: none;
            padding: 0.45rem 0.9rem;
            font-family: var(--font-title);
            font-size: 0.8rem;
            cursor: pointer;
            transition: var(--transition);
            box-shadow: 0 2px 4px rgba(160, 82, 45, 0.2);
            border-radius: 4px;
            text-decoration: none;
            display: inline-block;
            text-align: center;
            position: relative;
            overflow: hidden;
            letter-spacing: 1px;
            white-space: nowrap;
            min-height: 44px;
            display: inline-flex;
            align-items: center;
            justify-content: center;
        }

        .btn::after {
            content: '';
            position: absolute;
            top: 0;
            left: -100%;
            width: 100%;
            height: 100%;
            background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
            transition: 0.5s;
        }

        .btn:hover::after {
            left: 100%;
        }

        .btn:active {
            transform: scale(0.98);
        }

        .btn:hover {
            background-color: var(--color-tea-brown);
            transform: translateY(-2px);
            box-shadow: 0 4px 8px rgba(93, 64, 55, 0.3);
        }

        .btn-secondary {
            background-color: transparent;
            color: var(--color-ink-green);
            border: 1px solid var(--color-ink-green);
            box-shadow: none;
        }

        .btn-secondary:hover {
            background-color: var(--color-ink-green);
            color: #fff;
        }

        section {
            margin-bottom: 5rem;
            opacity: 0;
            transform: translateY(30px);
            transition: opacity 0.8s ease, transform 0.8s ease;
        }

        section.visible {
            opacity: 1;
            transform: translateY(0);
        }

        .section-title {
            font-family: var(--font-title);
            font-size: 2rem;
            margin-bottom: 2rem;
            position: relative;
            display: inline-block;
            padding-left: 1rem;
            letter-spacing: 2px;
        }

        .section-title::before {
            content: '';
            position: absolute;
            left: 0;
            top: 10%;
            height: 80%;
            width: 4px;
            background-color: var(--color-clay-red);
            border-radius: 2px;
        }

        .tech-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
            gap: 1.5rem;
        }

        .tech-card {
            background: var(--color-paper-white);
            padding: 1.5rem;
            border-top: 3px solid var(--color-grey-green);
            box-shadow: var(--shadow-soft);
            transition: var(--transition);
            position: relative;
        }

        .tech-card::after {
            content: '';
            position: absolute;
            bottom: 0;
            right: 0;
            width: 30px;
            height: 30px;
            background: linear-gradient(135deg, transparent 50%, rgba(93, 64, 55, 0.05) 50%);
        }

        .tech-card:hover {
            transform: translateY(-5px);
            border-top-color: var(--color-clay-red);
            box-shadow: var(--shadow-hover);
        }

        .tech-card h3 {
            font-family: var(--font-title);
            font-size: 1.2rem;
            margin-bottom: 0.6rem;
            color: var(--color-ink-green);
        }

        .tech-card p {
            font-size: 0.9rem;
            color: var(--color-grey-green);
            line-height: 1.7;
        }

        .project-highlight {
            background: var(--color-paper-white);
            border: 1px solid rgba(93, 64, 55, 0.1);
            padding: 2rem;
            position: relative;
            overflow: hidden;
            box-shadow: var(--shadow-soft);
        }

        .project-highlight::before {
            content: 'SERVICE';
            position: absolute;
            top: -10px;
            right: -10px;
            font-family: var(--font-tech);
            font-size: 4rem;
            color: rgba(93, 64, 55, 0.03);
            font-weight: bold;
            pointer-events: none;
            z-index: 0;
        }

        .project-content {
            display: flex;
            flex-wrap: wrap;
            gap: 2rem;
            align-items: center;
            position: relative;
            z-index: 1;
        }

        .project-image {
            flex: 1;
            min-width: 280px;
            position: relative;
        }

        .project-image img {
            width: 100%;
            height: auto;
            border-radius: 4px;
            filter: sepia(0.1) contrast(0.95);
            transition: var(--transition);
            box-shadow: 0 10px 20px rgba(0,0,0,0.1);
        }

        .project-image img:hover {
            filter: sepia(0) contrast(1);
            transform: scale(1.02);
        }

        .project-info {
            flex: 1.2;
            min-width: 280px;
        }

        .project-tags {
            display: flex;
            gap: 0.5rem;
            margin-bottom: 1rem;
            flex-wrap: wrap;
        }

        .tag {
            background-color: rgba(112, 128, 144, 0.1);
            color: var(--color-ink-green);
            padding: 0.3rem 0.7rem;
            font-size: 0.8rem;
            font-family: var(--font-tech);
            border-radius: 20px;
            border: 1px solid rgba(112, 128, 144, 0.2);
        }

        .project-info h3 {
            font-family: var(--font-title);
            font-size: 1.6rem;
            color: var(--color-tea-brown);
            margin-bottom: 0.8rem;
        }

        .project-info p {
            color: var(--color-grey-green);
            margin-bottom: 1.2rem;
            text-align: justify;
            font-size: 0.95rem;
        }

        .project-list {
            list-style: none;
            margin-top: 1.2rem;
            background: rgba(255,255,255,0.5);
            padding: 1.2rem;
            border-radius: 4px;
            border-left: 3px solid var(--color-clay-red);
        }

        .project-list li {
            margin-bottom: 0.6rem;
            padding-left: 1.3rem;
            position: relative;
            color: var(--color-tea-brown);
            font-size: 0.9rem;
        }

        .project-list li::before {
            content: '>';
            position: absolute;
            left: 0;
            color: var(--color-clay-red);
            font-family: var(--font-tech);
            font-weight: bold;
        }

        /* ========== 模态框优化 ========== */
        .modal-overlay {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: rgba(47, 79, 79, 0.8);
            backdrop-filter: blur(10px);
            display: flex;
            justify-content: center;
            align-items: center;
            z-index: 1000;
            opacity: 0;
            visibility: hidden;
            transition: var(--transition);
            padding: 1.5rem;
        }

        .modal-overlay.active {
            opacity: 1;
            visibility: visible;
        }

        .modal-content {
            background: var(--color-rice-white);
            padding: 3rem;
            border: 2px solid var(--color-tea-brown);
            text-align: center;
            position: relative;
            max-width: 95%;
            width: 500px;
            box-shadow: 0 25px 60px rgba(0,0,0,0.4);
            transform: scale(0.9);
            transition: var(--transition);
            background-image: linear-gradient(rgba(93, 64, 55, 0.02) 1px, transparent 1px),
            linear-gradient(90deg, rgba(93, 64, 55, 0.02) 1px, transparent 1px);
            background-size: 20px 20px;
            border-radius: 8px;
        }

        .modal-overlay.active .modal-content {
            transform: scale(1);
        }

        /* 二维码图片 - 保持原始比例，不变形 */
        .modal-content img {
            width: 280px;
            height: 280px;
            object-fit: contain;
            border: 2px solid var(--color-grey-green);
            margin-top: 1.5rem;
            padding: 10px;
            background: #fff;
            box-shadow: 0 6px 20px rgba(0,0,0,0.15);
            border-radius: 4px;
            display: block;
            margin-left: auto;
            margin-right: auto;
        }

        /* QQ 号码框 - 垂直布局 */
        .qq-info-wrapper {
            display: flex;
            flex-direction: column;
            align-items: center;
            gap: 1rem;
            margin-top: 1.5rem;
        }

        .modal-content .qq-number {
            font-family: var(--font-tech);
            font-size: 1.5rem;
            color: var(--color-tea-brown);
            padding: 1rem 1.5rem;
            background: rgba(93, 64, 55, 0.05);
            border-radius: 4px;
            user-select: all;
            cursor: pointer;
            border: 1px dashed var(--color-grey-green);
            display: inline-block;
            min-width: 200px;
            letter-spacing: 2px;
        }

        .modal-content .qq-number:hover {
            background: rgba(93, 64, 55, 0.1);
            border-color: var(--color-tea-brown);
        }

        .modal-content .qq-copy-btn {
            width: 100%;
            max-width: 200px;
            padding: 0.7rem 1.5rem;
            font-size: 0.95rem;
        }

        .close-modal {
            position: absolute;
            top: 15px;
            right: 20px;
            font-size: 2rem;
            cursor: pointer;
            color: var(--color-tea-brown);
            background: none;
            border: none;
            font-family: sans-serif;
            line-height: 1;
            transition: 0.3s;
            min-height: 44px;
            min-width: 44px;
            display: flex;
            align-items: center;
            justify-content: center;
            padding: 0;
        }
        
        .close-modal:hover {
            color: var(--color-clay-red);
            transform: rotate(90deg);
        }

        .modal-title {
            font-family: var(--font-title);
            font-size: 1.5rem;
            color: var(--color-tea-brown);
            margin-bottom: 0.5rem;
            letter-spacing: 2px;
        }

        .modal-subtitle {
            font-size: 0.9rem;
            color: var(--color-grey-green);
            margin-top: 0.5rem;
            line-height: 1.6;
        }

        .toast {
            position: fixed;
            bottom: 30px;
            left: 50%;
            transform: translateX(-50%) translateY(100px);
            background: var(--color-ink-green);
            color: #fff;
            padding: 0.9rem 1.8rem;
            border-radius: 4px;
            opacity: 0;
            transition: var(--transition);
            z-index: 1001;
            font-family: var(--font-tech);
            box-shadow: 0 10px 20px rgba(0,0,0,0.2);
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 0.9rem;
        }
        
        .toast::before {
            content: '✓';
            font-weight: bold;
            color: var(--color-clay-red);
        }

        .toast.show {
            transform: translateX(-50%) translateY(0);
            opacity: 1;
        }

        footer {
            text-align: center;
            padding: 3rem 0;
            border-top: 1px solid rgba(112, 128, 144, 0.3);
            color: var(--color-grey-green);
            font-size: 0.85rem;
            background: rgba(255,255,255,0.3);
        }

        footer a {
            color: var(--color-grey-green);
            text-decoration: none;
            transition: color 0.3s;
            border-bottom: 1px dotted var(--color-grey-green);
        }

        footer a:hover {
            color: var(--color-clay-red);
            border-bottom-color: var(--color-clay-red);
        }

        /* ========== H5 移动端适配 ========== */
        @media (max-width: 1024px) {
            .container {
                padding: 1rem;
            }

            .header-left-group {
                gap: 1rem;
            }

            .header-main {
                gap: 1rem;
            }

            .logo-wrapper {
                padding: 0.5rem 0.6rem;
            }

            .brand-logo {
                height: 40px;
            }

            .profile-section {
                gap: 0.8rem;
                padding-left: 1.2rem;
            }

            .avatar {
                width: 50px;
                height: 50px;
            }

            .intro-text h1 {
                font-size: 1.6rem;
                letter-spacing: 2px;
            }

            .intro-text p {
                font-size: 0.75rem;
            }

            .intro-text .subtitle {
                font-size: 0.65rem;
            }

            .contact-buttons {
                gap: 0.4rem;
                padding-left: 1.2rem;
            }

            .btn {
                padding: 0.4rem 0.7rem;
                font-size: 0.75rem;
            }

            .section-title {
                font-size: 1.8rem;
            }

            .project-highlight {
                padding: 1.5rem;
            }

            .project-info h3 {
                font-size: 1.4rem;
            }

            /* 平板端模态框 */
            .modal-content {
                width: 450px;
                padding: 2.5rem;
            }

            .modal-content img {
                width: 240px;
                height: 240px;
            }
        }

        @media (max-width: 768px) {
            html {
                font-size: 14px;
            }

            .container {
                padding: 0.8rem;
            }

            header {
                padding: 2rem 0 1.5rem 0;
                margin-bottom: 3rem;
            }

            .header-left-group {
                flex-wrap: wrap;
                justify-content: center;
                gap: 1rem;
            }

            .header-main {
                width: 100%;
                justify-content: center;
                gap: 1rem;
                flex-wrap: wrap;
            }

            .logo-wrapper {
                padding: 0.5rem 0.7rem;
            }

            .brand-logo {
                height: 42px;
            }

            .profile-section {
                border-left: none;
                padding-left: 0;
                gap: 0.8rem;
            }

            .avatar {
                width: 55px;
                height: 55px;
            }

            .intro-text {
                text-align: center;
            }

            .intro-text h1 {
                font-size: 1.7rem;
                letter-spacing: 3px;
            }

            .intro-text p {
                font-size: 0.75rem;
            }

            .intro-text .subtitle {
                font-size: 0.65rem;
            }

            .contact-buttons {
                width: 100%;
                justify-content: center;
                border-left: none;
                padding-left: 0;
                margin-top: 0.5rem;
                gap: 0.5rem;
                flex-wrap: wrap;
            }

            .btn {
                padding: 0.6rem 1rem;
                font-size: 0.85rem;
                min-width: 100px;
                flex: 1;
                max-width: 140px;
            }

            .section-title {
                font-size: 1.6rem;
                margin-bottom: 1.5rem;
            }

            .tech-grid {
                grid-template-columns: 1fr;
                gap: 1rem;
            }

            .tech-card {
                padding: 1.2rem;
            }

            .project-content {
                flex-direction: column;
                gap: 1.5rem;
            }

            .project-image,
            .project-info {
                min-width: 100%;
                width: 100%;
            }

            .project-highlight {
                padding: 1.2rem;
            }

            .project-info h3 {
                font-size: 1.3rem;
            }

            .project-info p {
                font-size: 0.9rem;
            }

            .project-list li {
                font-size: 0.85rem;
            }

            /* 手机端模态框 */
            .modal-overlay {
                padding: 1rem;
            }

            .modal-content {
                width: 90%;
                max-width: 400px;
                padding: 2rem 1.5rem;
            }

            .modal-content img {
                width: 220px;
                height: 220px;
                margin-top: 1rem;
            }

            .modal-title {
                font-size: 1.3rem;
            }

            .modal-subtitle {
                font-size: 0.85rem;
            }

            .modal-content .qq-number {
                font-size: 1.3rem;
                min-width: 180px;
                padding: 0.8rem 1.2rem;
            }

            .qq-info-wrapper {
                gap: 0.8rem;
            }

            .modal-content .qq-copy-btn {
                max-width: 180px;
                padding: 0.65rem 1.2rem;
                font-size: 0.9rem;
            }
        }

        @media (max-width: 480px) {
            html {
                font-size: 13px;
            }

            .container {
                padding: 0.6rem;
            }

            header {
                padding: 1.5rem 0 1rem 0;
                margin-bottom: 2.5rem;
            }

            .header-main {
                flex-direction: column;
                gap: 0.8rem;
            }

            .logo-wrapper {
                padding: 0.4rem 0.6rem;
                margin: 0 auto;
            }

            .brand-logo {
                height: 38px;
            }

            .profile-section {
                flex-direction: column;
                border-top: 1px solid rgba(112, 128, 144, 0.3);
                padding-top: 1rem;
                padding-left: 0;
                width: 100%;
            }

            .avatar {
                width: 60px;
                height: 60px;
            }

            .intro-text h1 {
                font-size: 1.5rem;
                letter-spacing: 2px;
            }

            .intro-text p {
                font-size: 0.7rem;
            }

            .intro-text .subtitle {
                font-size: 0.6rem;
            }

            .contact-buttons {
                flex-direction: column;
                width: 100%;
                gap: 0.5rem;
            }

            .btn {
                width: 100%;
                max-width: none;
                padding: 0.7rem 1rem;
                font-size: 0.9rem;
            }

            .section-title {
                font-size: 1.4rem;
            }

            .tech-card h3 {
                font-size: 1.1rem;
            }

            .tech-card p {
                font-size: 0.85rem;
            }

            .project-highlight {
                padding: 1rem;
            }

            .project-info h3 {
                font-size: 1.2rem;
            }

            .project-tags {
                gap: 0.3rem;
            }

            .tag {
                font-size: 0.7rem;
                padding: 0.25rem 0.6rem;
            }

            footer {
                padding: 2rem 0;
                font-size: 0.8rem;
            }

            /* 小屏幕手机模态框 */
            .modal-content {
                width: 92%;
                padding: 1.5rem 1rem;
            }

            .modal-content img {
                width: 200px;
                height: 200px;
            }

            .modal-title {
                font-size: 1.2rem;
            }

            .close-modal {
                top: 10px;
                right: 15px;
                font-size: 1.6rem;
            }

            .modal-content .qq-number {
                font-size: 1.2rem;
                min-width: 160px;
                padding: 0.7rem 1rem;
            }

            .modal-content .qq-copy-btn {
                max-width: 160px;
                padding: 0.6rem 1rem;
                font-size: 0.85rem;
            }
        }

        /* 横屏手机适配 */
        @media (max-height: 500px) and (orientation: landscape) {
            .header-left-group {
                flex-wrap: nowrap;
            }

            .header-main {
                flex-direction: row;
                flex-wrap: nowrap;
            }

            .profile-section {
                flex-direction: row;
                border-left: 1px solid rgba(112, 128, 144, 0.3);
                border-top: none;
                padding-left: 1rem;
                padding-top: 0;
            }

            .contact-buttons {
                flex-direction: row;
                flex-wrap: nowrap;
            }

            .btn {
                width: auto;
                padding: 0.4rem 0.7rem;
            }

            /* 横屏时模态框调整 */
            .modal-content {
                width: 400px;
                padding: 2rem;
            }

            .modal-content img {
                width: 180px;
                height: 180px;
            }

            .modal-content .qq-number {
                font-size: 1.2rem;
                padding: 0.7rem 1rem;
            }

            .modal-content .qq-copy-btn {
                max-width: 160px;
                padding: 0.6rem 1rem;
            }
        }