* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        :root {
            --primary: #1a2a4a;
            --secondary: #e8452b;
            --accent: #f7c948;
            --bg: #f4f6fa;
            --card-bg: #ffffff;
            --text: #1e1e2f;
            --text-light: #5a5a72;
            --border: #dce0e8;
            --radius: 12px;
            --shadow: 0 8px 30px rgba(0, 0, 0, 0.08);
            --font: 'Segoe UI', Roboto, system-ui, -apple-system, sans-serif;
        }
        html {
            scroll-behavior: smooth;
        }
        body {
            font-family: var(--font);
            background: var(--bg);
            color: var(--text);
            line-height: 1.7;
            font-size: 1.05rem;
            overflow-x: hidden;
        }
        a {
            color: var(--secondary);
            text-decoration: none;
            transition: color 0.2s;
        }
        a:hover {
            color: #b8301a;
            text-decoration: underline;
        }
        img {
            max-width: 100%;
            height: auto;
            border-radius: var(--radius);
        }
        .site-header {
            background: var(--primary);
            color: #fff;
            padding: 0.6rem 2rem;
            position: sticky;
            top: 0;
            z-index: 1000;
            box-shadow: 0 2px 20px rgba(0, 0, 0, 0.15);
        }
        .header-inner {
            max-width: 1300px;
            margin: 0 auto;
            display: flex;
            align-items: center;
            justify-content: space-between;
            flex-wrap: wrap;
            gap: 0.5rem 1.5rem;
        }
        .my-logo {
            font-size: 1.7rem;
            font-weight: 800;
            letter-spacing: -0.5px;
            color: #fff;
            display: flex;
            align-items: center;
            gap: 0.6rem;
            transition: opacity 0.2s;
        }
        .my-logo:hover {
            opacity: 0.85;
            text-decoration: none;
        }
        .my-logo i {
            color: var(--accent);
            font-size: 1.9rem;
        }
        .my-logo span {
            font-size: 0.85rem;
            font-weight: 400;
            opacity: 0.7;
            margin-left: 0.3rem;
        }
        .nav-toggle {
            display: none;
            background: none;
            border: none;
            color: #fff;
            font-size: 1.8rem;
            cursor: pointer;
            padding: 0.2rem 0.5rem;
            border-radius: 6px;
            transition: background 0.2s;
        }
        .nav-toggle:hover {
            background: rgba(255, 255, 255, 0.1);
        }
        .main-nav {
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            gap: 0.2rem 1.2rem;
            transition: all 0.3s ease;
        }
        .main-nav a {
            color: rgba(255, 255, 255, 0.85);
            font-weight: 500;
            font-size: 0.95rem;
            padding: 0.4rem 0.2rem;
            border-bottom: 2px solid transparent;
            transition: all 0.2s;
        }
        .main-nav a:hover {
            color: #fff;
            border-bottom-color: var(--accent);
            text-decoration: none;
        }
        .main-nav a i {
            margin-right: 0.35rem;
            font-size: 0.85rem;
            opacity: 0.7;
        }
        .breadcrumb-wrap {
            max-width: 1300px;
            margin: 0 auto;
            padding: 0.8rem 2rem 0;
        }
        .breadcrumb {
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            gap: 0.4rem 0.6rem;
            font-size: 0.9rem;
            color: var(--text-light);
            background: transparent;
            padding: 0.5rem 0;
        }
        .breadcrumb a {
            color: var(--secondary);
            font-weight: 500;
        }
        .breadcrumb a:hover {
            text-decoration: underline;
        }
        .breadcrumb i {
            font-size: 0.7rem;
            color: #aaa;
        }
        .breadcrumb .current {
            color: var(--text-light);
            font-weight: 400;
        }
        .page-wrap {
            max-width: 1300px;
            margin: 0 auto;
            padding: 1.5rem 2rem 3rem;
            display: grid;
            grid-template-columns: 1fr 320px;
            gap: 2.5rem;
        }
        .content-area {
            min-width: 0;
        }
        .sidebar-area {
            position: sticky;
            top: 90px;
            align-self: start;
        }
        article h1 {
            font-size: 2.8rem;
            font-weight: 800;
            line-height: 1.2;
            color: var(--primary);
            margin-bottom: 0.3rem;
            letter-spacing: -0.02em;
        }
        .article-meta {
            display: flex;
            flex-wrap: wrap;
            gap: 1rem 2rem;
            color: var(--text-light);
            font-size: 0.95rem;
            margin: 0.6rem 0 1.8rem;
            padding-bottom: 1rem;
            border-bottom: 2px solid var(--border);
        }
        .article-meta i {
            margin-right: 0.4rem;
            color: var(--secondary);
        }
        .article-meta .last-updated {
            font-weight: 600;
            color: var(--primary);
        }
        article h2 {
            font-size: 2rem;
            font-weight: 700;
            color: var(--primary);
            margin: 2.8rem 0 1rem 0;
            padding-bottom: 0.5rem;
            border-bottom: 3px solid var(--secondary);
            letter-spacing: -0.01em;
        }
        article h3 {
            font-size: 1.5rem;
            font-weight: 600;
            color: var(--primary);
            margin: 2rem 0 0.8rem 0;
        }
        article h4 {
            font-size: 1.2rem;
            font-weight: 600;
            color: var(--primary);
            margin: 1.5rem 0 0.5rem 0;
        }
        article p {
            margin-bottom: 1.2rem;
            color: var(--text);
        }
        article ul,
        article ol {
            margin: 0.8rem 0 1.5rem 2rem;
        }
        article li {
            margin-bottom: 0.5rem;
        }
        article .key-insight {
            background: var(--card-bg);
            border-left: 5px solid var(--secondary);
            padding: 1.2rem 1.8rem;
            margin: 1.5rem 0;
            border-radius: 0 var(--radius) var(--radius) 0;
            box-shadow: var(--shadow);
        }
        article .key-insight strong {
            color: var(--secondary);
        }
        article .pro-tip {
            background: #fef9e7;
            border-left: 5px solid var(--accent);
            padding: 1.2rem 1.8rem;
            margin: 1.5rem 0;
            border-radius: 0 var(--radius) var(--radius) 0;
            box-shadow: var(--shadow);
        }
        article .pro-tip strong {
            color: #b8860b;
        }
        .featured-image-wrap {
            margin: 2rem 0;
            border-radius: var(--radius);
            overflow: hidden;
            box-shadow: var(--shadow);
            background: var(--card-bg);
            padding: 0.5rem;
        }
        .featured-image-wrap img {
            display: block;
            width: 100%;
            border-radius: calc(var(--radius) - 4px);
        }
        .featured-image-wrap figcaption {
            padding: 0.7rem 1rem 0.3rem;
            font-size: 0.9rem;
            color: var(--text-light);
            text-align: center;
            font-style: italic;
        }
        .content-link {
            font-weight: 600;
            color: var(--secondary);
            padding: 0.1rem 0.2rem;
            border-bottom: 1px dashed var(--secondary);
        }
        .content-link:hover {
            background: var(--secondary);
            color: #fff;
            text-decoration: none;
            border-bottom-color: var(--secondary);
        }
        .sidebar-card {
            background: var(--card-bg);
            border-radius: var(--radius);
            padding: 1.5rem;
            margin-bottom: 1.8rem;
            box-shadow: var(--shadow);
        }
        .sidebar-card h3 {
            font-size: 1.2rem;
            font-weight: 700;
            color: var(--primary);
            margin-bottom: 1rem;
            padding-bottom: 0.5rem;
            border-bottom: 2px solid var(--border);
        }
        .sidebar-card ul {
            list-style: none;
            margin: 0;
        }
        .sidebar-card li {
            margin-bottom: 0.6rem;
        }
        .sidebar-card li a {
            display: block;
            padding: 0.4rem 0.6rem;
            border-radius: 6px;
            font-weight: 500;
            transition: background 0.2s, color 0.2s;
            color: var(--text);
        }
        .sidebar-card li a:hover {
            background: var(--bg);
            color: var(--secondary);
            text-decoration: none;
        }
        .sidebar-card li a i {
            margin-right: 0.5rem;
            color: var(--secondary);
            font-size: 0.85rem;
        }
        .search-form {
            display: flex;
            gap: 0.5rem;
            margin-top: 0.3rem;
        }
        .search-form input {
            flex: 1;
            padding: 0.7rem 1rem;
            border: 2px solid var(--border);
            border-radius: 8px;
            font-size: 0.95rem;
            outline: none;
            transition: border 0.2s;
            background: var(--bg);
        }
        .search-form input:focus {
            border-color: var(--secondary);
        }
        .search-form button {
            background: var(--secondary);
            color: #fff;
            border: none;
            padding: 0.7rem 1.2rem;
            border-radius: 8px;
            font-size: 1rem;
            cursor: pointer;
            transition: background 0.2s, transform 0.1s;
        }
        .search-form button:hover {
            background: #b8301a;
            transform: scale(1.02);
        }
        .feedback-section {
            margin-top: 3rem;
            padding-top: 2rem;
            border-top: 3px solid var(--border);
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 2rem;
        }
        .feedback-card {
            background: var(--card-bg);
            border-radius: var(--radius);
            padding: 1.8rem;
            box-shadow: var(--shadow);
        }
        .feedback-card h3 {
            font-size: 1.3rem;
            font-weight: 700;
            color: var(--primary);
            margin-bottom: 0.3rem;
        }
        .feedback-card .sub {
            color: var(--text-light);
            font-size: 0.95rem;
            margin-bottom: 1.2rem;
        }
        .feedback-card form {
            display: flex;
            flex-direction: column;
            gap: 0.8rem;
        }
        .feedback-card input,
        .feedback-card textarea {
            padding: 0.7rem 1rem;
            border: 2px solid var(--border);
            border-radius: 8px;
            font-size: 0.95rem;
            font-family: var(--font);
            outline: none;
            transition: border 0.2s;
            background: var(--bg);
        }
        .feedback-card input:focus,
        .feedback-card textarea:focus {
            border-color: var(--secondary);
        }
        .feedback-card textarea {
            min-height: 90px;
            resize: vertical;
        }
        .feedback-card button {
            background: var(--primary);
            color: #fff;
            border: none;
            padding: 0.8rem 1.5rem;
            border-radius: 8px;
            font-size: 1rem;
            font-weight: 600;
            cursor: pointer;
            transition: background 0.2s, transform 0.1s;
            align-self: flex-start;
        }
        .feedback-card button:hover {
            background: #2a3a5a;
            transform: scale(1.02);
        }
        .star-rating {
            display: flex;
            gap: 0.3rem;
            font-size: 1.8rem;
            color: #ddd;
            cursor: pointer;
            direction: rtl;
            margin: 0.3rem 0 0.6rem;
        }
        .star-rating i {
            transition: color 0.2s, transform 0.1s;
        }
        .star-rating i:hover,
        .star-rating i:hover~i {
            color: var(--accent);
            transform: scale(1.1);
        }
        .star-rating.active i.active {
            color: var(--accent);
        }
        .rating-value {
            font-size: 0.9rem;
            color: var(--text-light);
            margin-left: 0.5rem;
        }
        .site-footer {
            background: var(--primary);
            color: rgba(255, 255, 255, 0.8);
            padding: 2.5rem 2rem 1.8rem;
            margin-top: 2rem;
        }
        .footer-inner {
            max-width: 1300px;
            margin: 0 auto;
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            gap: 2rem;
        }
        .footer-inner .col {
            flex: 1 1 220px;
        }
        .footer-inner h4 {
            color: #fff;
            font-size: 1.1rem;
            margin-bottom: 1rem;
            font-weight: 600;
        }
        .footer-inner a {
            color: rgba(255, 255, 255, 0.7);
            display: block;
            margin-bottom: 0.4rem;
            font-size: 0.95rem;
        }
        .footer-inner a:hover {
            color: var(--accent);
            text-decoration: none;
        }
        friend-link {
            display: block;
            margin-top: 1.5rem;
            padding-top: 1.5rem;
            border-top: 1px solid rgba(255, 255, 255, 0.15);
            font-size: 0.95rem;
        }
        friend-link a {
            display: inline-block;
            margin: 0.3rem 1rem 0.3rem 0;
            color: rgba(255, 255, 255, 0.75);
        }
        friend-link a:hover {
            color: var(--accent);
        }
        .copyright {
            max-width: 1300px;
            margin: 1.5rem auto 0;
            padding-top: 1.2rem;
            border-top: 1px solid rgba(255, 255, 255, 0.1);
            text-align: center;
            font-size: 0.9rem;
            color: rgba(255, 255, 255, 0.5);
        }
        @media (max-width: 992px) {
            .page-wrap {
                grid-template-columns: 1fr;
                padding: 1rem 1.2rem 2rem;
            }
            .sidebar-area {
                position: static;
                display: grid;
                grid-template-columns: 1fr 1fr;
                gap: 1.2rem;
            }
            .sidebar-area .sidebar-card:last-child {
                grid-column: 1 / -1;
            }
            .feedback-section {
                grid-template-columns: 1fr;
            }
            article h1 {
                font-size: 2.2rem;
            }
            article h2 {
                font-size: 1.7rem;
            }
        }
        @media (max-width: 768px) {
            .site-header {
                padding: 0.5rem 1rem;
            }
            .header-inner {
                gap: 0.3rem;
            }
            .my-logo {
                font-size: 1.3rem;
            }
            .my-logo span {
                font-size: 0.7rem;
            }
            .nav-toggle {
                display: block;
            }
            .main-nav {
                display: none;
                width: 100%;
                flex-direction: column;
                gap: 0.3rem 0;
                padding: 0.8rem 0 0.3rem;
                border-top: 1px solid rgba(255, 255, 255, 0.1);
                margin-top: 0.5rem;
            }
            .main-nav.open {
                display: flex;
            }
            .main-nav a {
                padding: 0.6rem 0.3rem;
                font-size: 1rem;
                border-bottom: 1px solid rgba(255, 255, 255, 0.05);
            }
            .breadcrumb-wrap {
                padding: 0.5rem 1rem 0;
            }
            .breadcrumb {
                font-size: 0.8rem;
            }
            .page-wrap {
                padding: 0.8rem 1rem 2rem;
            }
            article h1 {
                font-size: 1.8rem;
            }
            article h2 {
                font-size: 1.4rem;
            }
            article h3 {
                font-size: 1.2rem;
            }
            .sidebar-area {
                grid-template-columns: 1fr;
            }
            .feedback-section {
                gap: 1.2rem;
            }
            .feedback-card {
                padding: 1.2rem;
            }
            .star-rating {
                font-size: 1.5rem;
            }
            .site-footer {
                padding: 1.8rem 1.2rem 1.2rem;
            }
            .footer-inner {
                flex-direction: column;
                gap: 1.5rem;
            }
        }
        @media (max-width: 480px) {
            .article-meta {
                font-size: 0.8rem;
                gap: 0.5rem 1rem;
            }
            article ul,
            article ol {
                margin-left: 1.2rem;
            }
            .search-form {
                flex-wrap: wrap;
            }
            .search-form button {
                width: 100%;
            }
        }
        .main-nav.open {
            animation: fadeSlide 0.3s ease;
        }
        @keyframes fadeSlide {
            0% {
                opacity: 0;
                transform: translateY(-10px);
            }
            100% {
                opacity: 1;
                transform: translateY(0);
            }
        }