:root {
            --primary: #F97316; 
            --secondary: #1E40AF; 
            --accent: #10B981; 
            --dark: #1F2937;
            --light: #F9FAFB;
            --text: #374151;
            --gray: #9CA3AF;
        }
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        html {
            scroll-behavior: smooth;
        }
        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            line-height: 1.7;
            color: var(--text);
            background-color: var(--light);
            overflow-x: hidden;
        }
        a {
            text-decoration: none;
            color: var(--secondary);
            transition: all 0.3s ease;
        }
        a:hover {
            color: var(--primary);
        }
        .container {
            width: 100%;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }
        header {
            background: linear-gradient(135deg, var(--dark) 0%, var(--secondary) 100%);
            color: white;
            padding: 1rem 0;
            position: sticky;
            top: 0;
            z-index: 1000;
            box-shadow: 0 4px 12px rgba(0,0,0,0.1);
        }
        .header-container {
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        .my-logo {
            font-family: 'Impact', 'Arial Black', sans-serif;
            font-size: 2.2rem;
            font-weight: bold;
            background: linear-gradient(to right, var(--primary), #FBBF24);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            letter-spacing: 1px;
            text-shadow: 2px 2px 4px rgba(0,0,0,0.2);
        }
        .my-logo:hover {
            transform: scale(1.03);
        }
        .desktop-nav {
            display: flex;
            gap: 2rem;
        }
        @media (max-width: 768px) {
            .desktop-nav {
                display: none;
            }
        }
        .desktop-nav a {
            color: white;
            font-weight: 600;
            padding: 0.5rem 1rem;
            border-radius: 5px;
        }
        .desktop-nav a:hover {
            background-color: rgba(255,255,255,0.1);
            color: #FBBF24;
        }
        .mobile-menu-btn {
            display: none;
            background: none;
            border: none;
            color: white;
            font-size: 1.8rem;
            cursor: pointer;
        }
        @media (max-width: 768px) {
            .mobile-menu-btn {
                display: block;
            }
        }
        .mobile-nav {
            display: none;
            flex-direction: column;
            background-color: var(--dark);
            position: absolute;
            top: 100%;
            left: 0;
            width: 100%;
            padding: 1rem;
            box-shadow: 0 5px 15px rgba(0,0,0,0.2);
        }
        .mobile-nav.active {
            display: flex;
        }
        .mobile-nav a {
            color: white;
            padding: 0.8rem 1rem;
            border-bottom: 1px solid rgba(255,255,255,0.1);
        }
        .mobile-nav a:last-child {
            border-bottom: none;
        }
        .mobile-nav a:hover {
            background-color: var(--primary);
            padding-left: 1.5rem;
        }
        .breadcrumb {
            background-color: #E5E7EB;
            padding: 0.8rem 0;
            font-size: 0.9rem;
        }
        .breadcrumb a {
            color: var(--secondary);
        }
        .breadcrumb a:hover {
            text-decoration: underline;
        }
        .breadcrumb span {
            color: var(--gray);
            margin: 0 5px;
        }
        main {
            display: grid;
            grid-template-columns: 1fr 300px;
            gap: 2.5rem;
            padding: 2rem 0;
        }
        @media (max-width: 992px) {
            main {
                grid-template-columns: 1fr;
            }
        }
        .article-content {
            background-color: white;
            border-radius: 12px;
            padding: 2.5rem;
            box-shadow: 0 5px 15px rgba(0,0,0,0.05);
        }
        .sidebar {
            background-color: white;
            border-radius: 12px;
            padding: 1.5rem;
            box-shadow: 0 5px 15px rgba(0,0,0,0.05);
            height: fit-content;
            position: sticky;
            top: 100px;
        }
        .sidebar h3 {
            color: var(--secondary);
            border-bottom: 2px solid var(--primary);
            padding-bottom: 0.5rem;
            margin-bottom: 1rem;
        }
        .sidebar ul {
            list-style: none;
        }
        .sidebar li {
            margin-bottom: 0.8rem;
            padding-left: 1rem;
            position: relative;
        }
        .sidebar li:before {
            content: '🏃';
            position: absolute;
            left: 0;
        }
        h1 {
            font-size: 2.8rem;
            color: var(--dark);
            margin-bottom: 1.5rem;
            line-height: 1.2;
            border-left: 6px solid var(--primary);
            padding-left: 1rem;
        }
        @media (max-width: 768px) {
            h1 {
                font-size: 2.2rem;
            }
        }
        h2 {
            font-size: 2rem;
            color: var(--secondary);
            margin: 2.5rem 0 1.2rem;
            padding-bottom: 0.5rem;
            border-bottom: 2px dashed var(--accent);
        }
        h3 {
            font-size: 1.6rem;
            color: var(--primary);
            margin: 2rem 0 1rem;
        }
        h4 {
            font-size: 1.3rem;
            color: var(--dark);
            margin: 1.5rem 0 0.8rem;
        }
        p {
            margin-bottom: 1.5rem;
            text-align: justify;
        }
        .intro {
            font-size: 1.2rem;
            color: var(--secondary);
            font-weight: 600;
            background-color: #F0F9FF;
            padding: 1.5rem;
            border-radius: 8px;
            border-left: 4px solid var(--accent);
            margin-bottom: 2rem;
        }
        em {
            color: var(--primary);
            font-style: italic;
        }
        strong {
            color: var(--secondary);
            font-weight: 700;
        }
        .highlight {
            background-color: #FEF3C7;
            padding: 0.2rem 0.5rem;
            border-radius: 3px;
            font-weight: bold;
        }
        .quote {
            border-left: 4px solid var(--accent);
            padding-left: 1.5rem;
            margin: 2rem 0;
            font-style: italic;
            color: var(--dark);
            background-color: #F9FAFB;
            padding: 1.5rem;
            border-radius: 0 8px 8px 0;
        }
        .author {
            text-align: right;
            color: var(--gray);
            font-weight: bold;
            margin-top: 0.5rem;
        }
        .link-list {
            background-color: #F3F4F6;
            padding: 1.5rem;
            border-radius: 8px;
            margin: 2rem 0;
        }
        .link-list h4 {
            margin-top: 0;
        }
        .link-list ul {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
            gap: 0.8rem;
            list-style: none;
        }
        .link-list li {
            padding: 0.5rem;
            border-left: 3px solid var(--primary);
            background-color: white;
            border-radius: 0 5px 5px 0;
        }
        .link-list a:hover {
            color: var(--primary);
        }
        .article-img {
            width: 100%;
            max-width: 800px;
            height: auto;
            border-radius: 10px;
            margin: 2rem auto;
            display: block;
            box-shadow: 0 8px 20px rgba(0,0,0,0.1);
            transition: transform 0.3s ease;
        }
        .article-img:hover {
            transform: scale(1.01);
        }
        .img-caption {
            text-align: center;
            font-style: italic;
            color: var(--gray);
            margin-top: 0.5rem;
            font-size: 0.9rem;
        }
        .search-box {
            background: linear-gradient(135deg, #E0F2FE 0%, #DBEAFE 100%);
            padding: 2rem;
            border-radius: 10px;
            margin: 2.5rem 0;
            text-align: center;
        }
        .search-box h3 {
            margin-top: 0;
        }
        .search-form {
            display: flex;
            max-width: 500px;
            margin: 1rem auto 0;
        }
        .search-form input {
            flex: 1;
            padding: 0.8rem 1rem;
            border: 2px solid var(--primary);
            border-radius: 5px 0 0 5px;
            font-size: 1rem;
            outline: none;
        }
        .search-form button {
            background-color: var(--primary);
            color: white;
            border: none;
            padding: 0 1.5rem;
            border-radius: 0 5px 5px 0;
            cursor: pointer;
            font-size: 1.1rem;
            transition: background-color 0.3s;
        }
        .search-form button:hover {
            background-color: #EA580C;
        }
        .user-interaction {
            background-color: white;
            border: 1px solid #E5E7EB;
            border-radius: 10px;
            padding: 2rem;
            margin: 3rem 0;
        }
        .rating {
            display: flex;
            align-items: center;
            gap: 1rem;
            margin-bottom: 1.5rem;
        }
        .stars {
            display: flex;
            gap: 0.2rem;
        }
        .star {
            font-size: 1.5rem;
            color: #E5E7EB;
            cursor: pointer;
            transition: color 0.2s;
        }
        .star:hover,
        .star.active {
            color: #FBBF24;
        }
        .comment-form textarea {
            width: 100%;
            padding: 1rem;
            border: 1px solid #D1D5DB;
            border-radius: 5px;
            font-family: inherit;
            margin-bottom: 1rem;
            resize: vertical;
            min-height: 120px;
        }
        .comment-form button {
            background-color: var(--accent);
            color: white;
            border: none;
            padding: 0.8rem 2rem;
            border-radius: 5px;
            cursor: pointer;
            font-weight: bold;
            transition: background-color 0.3s;
        }
        .comment-form button:hover {
            background-color: #0DA271;
        }
        footer {
            background-color: var(--dark);
            color: white;
            padding: 3rem 0 1.5rem;
            margin-top: 3rem;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 2rem;
            margin-bottom: 2rem;
        }
        .footer-section h4 {
            color: var(--primary);
            border-bottom: 2px solid var(--primary);
            padding-bottom: 0.5rem;
            margin-bottom: 1.5rem;
        }
        .friend-links {
            display: flex;
            flex-wrap: wrap;
            gap: 1rem;
            margin: 1rem 0;
        }
        friend-link {
            display: inline-block;
            background-color: rgba(255,255,255,0.1);
            padding: 0.5rem 1rem;
            border-radius: 5px;
            transition: all 0.3s;
        }
        friend-link:hover {
            background-color: var(--primary);
            transform: translateY(-2px);
        }
        friend-link a {
            color: white;
        }
        .copyright {
            text-align: center;
            padding-top: 1.5rem;
            border-top: 1px solid rgba(255,255,255,0.1);
            color: var(--gray);
            font-size: 0.9rem;
        }
        .update-time {
            background-color: #FEF3C7;
            color: var(--dark);
            padding: 0.5rem 1rem;
            border-radius: 5px;
            display: inline-block;
            margin: 1rem 0;
            font-weight: bold;
        }
        .text-center { text-align: center; }
        .mb-1 { margin-bottom: 1rem; }
        .mb-2 { margin-bottom: 2rem; }
        .mt-2 { margin-top: 2rem; }
        .emoji { font-size: 1.2em; }
        @media (max-width: 768px) {
            .article-content {
                padding: 1.5rem;
            }
            .sidebar {
                position: static;
            }
        }