* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        :root {
            --primary-color: #1e3a8a;
            --secondary-color: #dc2626;
            --accent-color: #f59e0b;
            --text-color: #1f2937;
            --light-bg: #f8fafc;
            --dark-bg: #0f172a;
            --card-bg: #ffffff;
            --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
            --transition: all 0.3s ease;
        }
        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            line-height: 1.7;
            color: var(--text-color);
            background-color: var(--light-bg);
            overflow-x: hidden;
        }
        h1, h2, h3, h4 {
            color: var(--primary-color);
            margin-bottom: 1rem;
            line-height: 1.3;
        }
        h1 {
            font-size: 2.8rem;
            margin-top: 1.5rem;
            border-bottom: 3px solid var(--accent-color);
            padding-bottom: 0.5rem;
        }
        h2 {
            font-size: 2.2rem;
            color: var(--secondary-color);
            margin-top: 2.5rem;
        }
        h3 {
            font-size: 1.8rem;
            margin-top: 2rem;
        }
        h4 {
            font-size: 1.4rem;
            margin-top: 1.5rem;
            color: #374151;
        }
        p {
            margin-bottom: 1.5rem;
            font-size: 1.1rem;
            text-align: justify;
        }
        .container {
            width: 100%;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }
        header {
            background: linear-gradient(135deg, var(--dark-bg) 0%, var(--primary-color) 100%);
            color: white;
            padding: 1.5rem 0;
            position: sticky;
            top: 0;
            z-index: 1000;
            box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
        }
        .header-container {
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        .my-logo {
            font-size: 2.2rem;
            font-weight: 900;
            text-transform: uppercase;
            letter-spacing: 2px;
            background: linear-gradient(to right, #fbbf24, #dc2626);
            -webkit-background-clip: text;
            background-clip: text;
            color: transparent;
            text-decoration: none;
            transition: var(--transition);
        }
        .my-logo:hover {
            transform: scale(1.05);
        }
        .desktop-nav {
            display: flex;
            gap: 2rem;
        }
        @media (max-width: 768px) {
            .desktop-nav {
                display: none;
            }
        }
        .desktop-nav a {
            color: white;
            text-decoration: none;
            font-weight: 600;
            padding: 0.5rem 1rem;
            border-radius: 4px;
            transition: var(--transition);
        }
        .desktop-nav a:hover {
            background-color: rgba(255, 255, 255, 0.15);
            transform: translateY(-2px);
        }
        .mobile-menu-btn {
            display: none;
            background: none;
            border: none;
            color: white;
            font-size: 1.8rem;
            cursor: pointer;
            padding: 0.5rem;
        }
        @media (max-width: 768px) {
            .mobile-menu-btn {
                display: block;
            }
        }
        .mobile-nav {
            position: fixed;
            top: 80px;
            left: 0;
            width: 100%;
            background-color: var(--dark-bg);
            transform: translateY(-100%);
            opacity: 0;
            transition: var(--transition);
            z-index: 999;
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.2);
        }
        .mobile-nav.active {
            transform: translateY(0);
            opacity: 1;
        }
        .mobile-nav a {
            display: block;
            color: white;
            text-decoration: none;
            padding: 1.2rem 2rem;
            border-bottom: 1px solid rgba(255, 255, 255, 0.1);
            font-weight: 600;
            transition: var(--transition);
        }
        .mobile-nav a:hover {
            background-color: rgba(255, 255, 255, 0.1);
            padding-left: 2.5rem;
        }
        .breadcrumb {
            background-color: #e5e7eb;
            padding: 1rem 0;
            margin-bottom: 2rem;
            border-radius: 8px;
            padding-left: 1rem;
        }
        .breadcrumb a {
            color: var(--primary-color);
            text-decoration: none;
            font-weight: 500;
        }
        .breadcrumb a:hover {
            text-decoration: underline;
        }
        .breadcrumb span {
            color: #6b7280;
            margin: 0 0.5rem;
        }
        main {
            padding: 2rem 0;
            background-color: white;
            border-radius: 12px;
            box-shadow: var(--shadow);
            margin-bottom: 3rem;
            position: relative;
            overflow: hidden;
        }
        .content-wrapper {
            padding: 0 2.5rem;
        }
        @media (max-width: 768px) {
            .content-wrapper {
                padding: 0 1.2rem;
            }
            h1 {
                font-size: 2rem;
            }
            h2 {
                font-size: 1.7rem;
            }
            h3 {
                font-size: 1.4rem;
            }
        }
        .article-meta {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin-bottom: 2rem;
            padding-bottom: 1rem;
            border-bottom: 2px dashed #d1d5db;
            flex-wrap: wrap;
            gap: 1rem;
        }
        .update-time {
            background-color: #fef3c7;
            padding: 0.5rem 1rem;
            border-radius: 20px;
            font-weight: 600;
            color: #92400e;
        }
        .word-count {
            background-color: #dbeafe;
            padding: 0.5rem 1rem;
            border-radius: 20px;
            font-weight: 600;
            color: var(--primary-color);
        }
        .featured-image {
            width: 100%;
            max-height: 500px;
            object-fit: cover;
            border-radius: 12px;
            margin: 2rem 0;
            box-shadow: 0 10px 25px rgba(0, 0, 0, 0.15);
            transition: var(--transition);
        }
        .featured-image:hover {
            transform: scale(1.005);
            box-shadow: 0 15px 35px rgba(0, 0, 0, 0.2);
        }
        .highlight-box {
            background: linear-gradient(135deg, #f0f9ff 0%, #e0f2fe 100%);
            border-left: 5px solid var(--primary-color);
            padding: 2rem;
            margin: 2.5rem 0;
            border-radius: 0 12px 12px 0;
            box-shadow: var(--shadow);
        }
        .tip {
            background-color: #f0fdf4;
            border: 1px solid #bbf7d0;
            padding: 1.5rem;
            border-radius: 8px;
            margin: 1.5rem 0;
            position: relative;
            padding-left: 3.5rem;
        }
        .tip::before {
            content: "💡";
            position: absolute;
            left: 1.2rem;
            top: 1.2rem;
            font-size: 1.5rem;
        }
        .skill-list {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
            gap: 1.5rem;
            margin: 2rem 0;
        }
        .skill-card {
            background: var(--card-bg);
            border-radius: 12px;
            padding: 1.5rem;
            box-shadow: var(--shadow);
            transition: var(--transition);
            border: 1px solid #e5e7eb;
        }
        .skill-card:hover {
            transform: translateY(-8px);
            box-shadow: 0 12px 20px rgba(0, 0, 0, 0.15);
            border-color: var(--accent-color);
        }
        .skill-card h4 {
            color: var(--secondary-color);
            margin-top: 0;
            display: flex;
            align-items: center;
            gap: 0.7rem;
        }
        .skill-card h4 i {
            color: var(--accent-color);
        }
        .interactive-section {
            background: linear-gradient(135deg, #f8fafc 0%, #f1f5f9 100%);
            border-radius: 12px;
            padding: 2.5rem;
            margin: 3rem 0;
            border: 2px solid #e2e8f0;
        }
        .interactive-section h3 {
            text-align: center;
            color: var(--dark-bg);
        }
        .form-group {
            margin-bottom: 1.8rem;
        }
        .form-group label {
            display: block;
            margin-bottom: 0.7rem;
            font-weight: 600;
            color: var(--primary-color);
        }
        .form-control {
            width: 100%;
            padding: 1rem;
            border: 2px solid #cbd5e1;
            border-radius: 8px;
            font-size: 1rem;
            transition: var(--transition);
        }
        .form-control:focus {
            outline: none;
            border-color: var(--primary-color);
            box-shadow: 0 0 0 3px rgba(30, 58, 138, 0.2);
        }
        textarea.form-control {
            min-height: 150px;
            resize: vertical;
        }
        .rating-stars {
            display: flex;
            gap: 0.5rem;
            margin: 1rem 0;
            font-size: 1.8rem;
            color: #fbbf24;
        }
        .star {
            cursor: pointer;
            transition: var(--transition);
        }
        .star:hover {
            transform: scale(1.3);
        }
        .btn {
            display: inline-block;
            background: linear-gradient(to right, var(--primary-color), var(--secondary-color));
            color: white;
            border: none;
            padding: 1rem 2.5rem;
            border-radius: 8px;
            font-size: 1.1rem;
            font-weight: 700;
            cursor: pointer;
            transition: var(--transition);
            text-decoration: none;
            text-align: center;
        }
        .btn:hover {
            transform: translateY(-3px);
            box-shadow: 0 10px 20px rgba(220, 38, 38, 0.3);
            background: linear-gradient(to right, var(--secondary-color), var(--primary-color));
        }
        .btn-block {
            display: block;
            width: 100%;
        }
        .related-links {
            background-color: var(--light-bg);
            padding: 2rem;
            border-radius: 12px;
            margin: 3rem 0;
        }
        .related-links h3 {
            color: var(--dark-bg);
            margin-bottom: 1.5rem;
            padding-bottom: 0.7rem;
            border-bottom: 2px solid var(--accent-color);
        }
        .links-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
            gap: 1.2rem;
        }
        .links-grid a {
            display: flex;
            align-items: center;
            gap: 0.8rem;
            color: var(--primary-color);
            text-decoration: none;
            padding: 1rem;
            background-color: white;
            border-radius: 8px;
            transition: var(--transition);
            border: 1px solid #e5e7eb;
        }
        .links-grid a:hover {
            background-color: #eff6ff;
            border-color: var(--primary-color);
            transform: translateX(5px);
        }
        .links-grid a i {
            color: var(--secondary-color);
        }
        footer {
            background-color: var(--dark-bg);
            color: white;
            padding: 3rem 0 1.5rem;
            margin-top: 3rem;
        }
        .footer-container {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 2.5rem;
            margin-bottom: 2.5rem;
        }
        .footer-section h4 {
            color: white;
            margin-bottom: 1.5rem;
            font-size: 1.4rem;
            position: relative;
            padding-bottom: 0.7rem;
        }
        .footer-section h4::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 50px;
            height: 3px;
            background-color: var(--accent-color);
        }
        .footer-section a {
            color: #cbd5e1;
            text-decoration: none;
            display: block;
            margin-bottom: 0.8rem;
            transition: var(--transition);
        }
        .footer-section a:hover {
            color: white;
            transform: translateX(5px);
        }
        friend-link {
            display: block;
            margin: 1rem 0;
            padding: 1rem;
            background-color: rgba(255, 255, 255, 0.05);
            border-radius: 8px;
            border-left: 4px solid var(--accent-color);
        }
        friend-link a {
            color: #fbbf24 !important;
            font-weight: 600;
        }
        .copyright {
            text-align: center;
            padding-top: 2rem;
            border-top: 1px solid #334155;
            color: #94a3b8;
            font-size: 0.95rem;
        }
        .text-center {
            text-align: center;
        }
        .mb-3 {
            margin-bottom: 3rem;
        }
        .mt-3 {
            margin-top: 3rem;
        }
        .bold {
            font-weight: 900;
            color: var(--primary-color);
        }
        .highlight {
            background-color: #fef3c7;
            padding: 0.2rem 0.5rem;
            border-radius: 4px;
            font-weight: 600;
        }
        .emoji {
            font-size: 1.3rem;
            margin-right: 0.5rem;
        }
        @media (max-width: 992px) {
            .skill-list {
                grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
            }
        }
        @media (max-width: 576px) {
            .header-container {
                flex-direction: column;
                gap: 1.2rem;
                text-align: center;
            }
            .article-meta {
                flex-direction: column;
                align-items: flex-start;
            }
            .skill-list {
                grid-template-columns: 1fr;
            }
            .links-grid {
                grid-template-columns: 1fr;
            }
            .interactive-section {
                padding: 1.5rem;
            }
        }
        @keyframes fadeIn {
            from { opacity: 0; transform: translateY(20px); }
            to { opacity: 1; transform: translateY(0); }
        }
        .fade-in {
            animation: fadeIn 0.8s ease-out;
        }
        @media print {
            header, footer, .interactive-section, .mobile-menu-btn {
                display: none !important;
            }
            body {
                background-color: white;
                color: black;
            }
            .container {
                max-width: 100%;
                padding: 0;
            }
            main {
                box-shadow: none;
                margin: 0;
                padding: 0;
            }
            a {
                color: black;
                text-decoration: underline;
            }
        }