* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        html {
            scroll-behavior: smooth;
            font-size: 16px;
        }
        body {
            font-family: 'Segoe UI', system-ui, -apple-system, Roboto, Helvetica, Arial, sans-serif;
            background: #f5f7fb;
            color: #1e2a3a;
            line-height: 1.7;
            padding: 0 1rem;
        }
        a {
            color: #0057b3;
            text-decoration: none;
            transition: color 0.2s ease;
        }
        a:hover {
            color: #ff6f00;
            text-decoration: underline;
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
            border-radius: 12px;
        }
        ul,
        ol {
            padding-left: 1.6rem;
            margin: 0.8rem 0;
        }
        li {
            margin-bottom: 0.3rem;
        }
        h1,
        h2,
        h3,
        h4 {
            line-height: 1.3;
            letter-spacing: -0.01em;
            color: #0b1a2b;
        }
        h1 {
            font-size: 2.2rem;
            margin: 1.2rem 0 0.8rem;
            border-left: 6px solid #ff6f00;
            padding-left: 1rem;
        }
        h2 {
            font-size: 1.7rem;
            margin: 2rem 0 0.8rem;
            border-bottom: 2px solid #e0e7ef;
            padding-bottom: 0.3rem;
        }
        h3 {
            font-size: 1.3rem;
            margin: 1.4rem 0 0.5rem;
        }
        h4 {
            font-size: 1.1rem;
            margin: 1rem 0 0.3rem;
            font-weight: 600;
        }
        p {
            margin: 0.8rem 0;
            font-size: 1.02rem;
        }
        .container {
            max-width: 1200px;
            margin: 0 auto;
            background: #ffffff;
            box-shadow: 0 0 40px rgba(0, 0, 0, 0.04);
            border-radius: 20px;
            padding: 1.2rem 1.8rem 2rem;
        }
        .site-header {
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            justify-content: space-between;
            padding: 0.8rem 0 0.6rem;
            border-bottom: 1px solid #e8edf4;
            position: relative;
        }
        .my-logo {
            font-size: 1.8rem;
            font-weight: 800;
            background: linear-gradient(145deg, #1a2a44, #0d1b2a);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            letter-spacing: -0.5px;
            display: inline-flex;
            align-items: center;
            gap: 0.4rem;
        }
        .my-logo i {
            -webkit-text-fill-color: #ff6f00;
            font-size: 1.6rem;
        }
        .my-logo:hover {
            opacity: 0.85;
            text-decoration: none;
        }
        .nav-bar {
            display: flex;
            align-items: center;
            gap: 0.2rem;
            flex-wrap: wrap;
        }
        .nav-bar a {
            padding: 0.45rem 0.9rem;
            border-radius: 40px;
            font-weight: 500;
            font-size: 0.92rem;
            color: #1e2a3a;
            transition: background 0.2s, color 0.2s;
        }
        .nav-bar a:hover {
            background: #eef3f9;
            color: #0057b3;
            text-decoration: none;
        }
        .nav-bar a.active {
            background: #0b1a2b;
            color: #fff;
        }
        .hamburger {
            display: none;
            background: none;
            border: none;
            font-size: 1.8rem;
            color: #1e2a3a;
            cursor: pointer;
            padding: 0.2rem 0.4rem;
        }
        #nav-toggle {
            display: none;
        }
        .breadcrumb {
            font-size: 0.88rem;
            color: #5a6e7e;
            padding: 0.4rem 0 0.2rem;
            display: flex;
            flex-wrap: wrap;
            gap: 0.3rem;
        }
        .breadcrumb a {
            color: #3a5a7a;
        }
        .breadcrumb span {
            margin: 0 0.2rem;
        }
        .search-section {
            background: #f0f4fa;
            border-radius: 16px;
            padding: 1.2rem 1.5rem;
            margin: 1.2rem 0 1.8rem;
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            gap: 0.8rem;
        }
        .search-section label {
            font-weight: 600;
            font-size: 1.05rem;
            display: flex;
            align-items: center;
            gap: 0.5rem;
        }
        .search-form {
            display: flex;
            flex: 1 1 280px;
            gap: 0.4rem;
        }
        .search-form input {
            flex: 1;
            padding: 0.6rem 1rem;
            border: 1px solid #ccd8e6;
            border-radius: 40px;
            font-size: 0.95rem;
            outline: none;
            transition: border 0.2s;
        }
        .search-form input:focus {
            border-color: #0057b3;
            box-shadow: 0 0 0 3px rgba(0, 87, 179, 0.1);
        }
        .search-form button {
            background: #0057b3;
            color: #fff;
            border: none;
            border-radius: 40px;
            padding: 0.6rem 1.4rem;
            font-weight: 600;
            font-size: 0.95rem;
            cursor: pointer;
            transition: background 0.2s;
            display: flex;
            align-items: center;
            gap: 0.4rem;
        }
        .search-form button:hover {
            background: #003d82;
        }
        .content-grid {
            display: grid;
            grid-template-columns: 1fr 300px;
            gap: 2rem;
            margin: 1.5rem 0;
        }
        .main-article {
            min-width: 0;
        }
        .sidebar {
            background: #f8faff;
            border-radius: 16px;
            padding: 1.2rem 1.4rem;
            border: 1px solid #e3ebf5;
            height: fit-content;
            position: sticky;
            top: 1rem;
        }
        .sidebar h3 {
            font-size: 1.1rem;
            border-bottom: 2px solid #dce6f0;
            padding-bottom: 0.4rem;
            margin-bottom: 0.8rem;
        }
        .sidebar ul {
            list-style: none;
            padding: 0;
        }
        .sidebar li {
            margin-bottom: 0.5rem;
            border-bottom: 1px dashed #e3ebf5;
            padding-bottom: 0.4rem;
        }
        .sidebar li a {
            display: flex;
            align-items: center;
            gap: 0.4rem;
            font-size: 0.93rem;
        }
        .featured-image {
            margin: 1.8rem 0;
            border-radius: 16px;
            overflow: hidden;
            background: #eef3f9;
            text-align: center;
        }
        .featured-image figcaption {
            padding: 0.6rem 1rem;
            font-size: 0.9rem;
            color: #3a5a7a;
            background: #f0f4fa;
        }
        .feedback-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 1.5rem;
            margin: 2rem 0 1.5rem;
        }
        .feedback-card {
            background: #f8faff;
            border-radius: 16px;
            padding: 1.2rem 1.5rem;
            border: 1px solid #e3ebf5;
        }
        .feedback-card h3 {
            margin-top: 0;
            display: flex;
            align-items: center;
            gap: 0.5rem;
        }
        .feedback-card form {
            display: flex;
            flex-direction: column;
            gap: 0.6rem;
            margin-top: 0.6rem;
        }
        .feedback-card input,
        .feedback-card textarea {
            padding: 0.6rem 1rem;
            border: 1px solid #ccd8e6;
            border-radius: 10px;
            font-size: 0.95rem;
            outline: none;
            font-family: inherit;
            transition: border 0.2s;
        }
        .feedback-card input:focus,
        .feedback-card textarea:focus {
            border-color: #0057b3;
        }
        .feedback-card textarea {
            min-height: 80px;
            resize: vertical;
        }
        .feedback-card button {
            background: #0b1a2b;
            color: #fff;
            border: none;
            border-radius: 40px;
            padding: 0.6rem 1.4rem;
            font-weight: 600;
            cursor: pointer;
            transition: background 0.2s;
            align-self: flex-start;
        }
        .feedback-card button:hover {
            background: #1e2a3a;
        }
        .star-rating {
            display: flex;
            flex-direction: row-reverse;
            justify-content: flex-end;
            gap: 0.2rem;
            font-size: 1.6rem;
        }
        .star-rating input {
            display: none;
        }
        .star-rating label {
            cursor: pointer;
            color: #ccd8e6;
            transition: color 0.15s;
        }
        .star-rating label:hover,
        .star-rating label:hover~label,
        .star-rating input:checked~label {
            color: #ffb300;
        }
        .site-footer {
            margin-top: 2.5rem;
            padding-top: 1.5rem;
            border-top: 2px solid #e8edf4;
        }
        friend-link {
            display: block;
            background: #f0f4fa;
            border-radius: 16px;
            padding: 1rem 1.4rem;
            margin: 1rem 0 1.2rem;
            font-size: 0.95rem;
        }
        friend-link a {
            display: inline-block;
            margin: 0.2rem 0.6rem 0.2rem 0;
        }
        .copyright {
            text-align: center;
            padding: 1rem 0 0.4rem;
            font-size: 0.88rem;
            color: #5a6e7e;
        }
        .copyright strong {
            color: #1e2a3a;
        }
        @media (max-width: 820px) {
            .content-grid {
                grid-template-columns: 1fr;
            }
            .sidebar {
                position: static;
                order: 2;
            }
            .feedback-grid {
                grid-template-columns: 1fr;
            }
            .container {
                padding: 0.8rem 1rem 1.5rem;
            }
            h1 {
                font-size: 1.7rem;
            }
            h2 {
                font-size: 1.4rem;
            }
            .nav-bar {
                display: none;
                width: 100%;
                flex-direction: column;
                background: #ffffff;
                border-radius: 16px;
                padding: 0.8rem 0.4rem;
                box-shadow: 0 12px 30px rgba(0, 0, 0, 0.06);
                margin-top: 0.4rem;
            }
            .nav-bar a {
                padding: 0.5rem 1rem;
                width: 100%;
            }
            .hamburger {
                display: block;
            }
            #nav-toggle:checked~.nav-bar {
                display: flex;
            }
            .site-header {
                flex-wrap: wrap;
            }
            .my-logo {
                font-size: 1.5rem;
            }
            .search-section {
                flex-direction: column;
                align-items: stretch;
            }
            .search-form {
                flex: 1;
            }
        }
        @media (max-width: 480px) {
            .container {
                padding: 0.4rem 0.6rem 1rem;
                border-radius: 12px;
            }
            h1 {
                font-size: 1.4rem;
                padding-left: 0.6rem;
            }
            h2 {
                font-size: 1.2rem;
            }
            .feedback-card {
                padding: 0.8rem 1rem;
            }
            .star-rating {
                font-size: 1.3rem;
            }
        }
        .tag {
            display: inline-block;
            background: #eef3f9;
            border-radius: 30px;
            padding: 0.15rem 0.7rem;
            font-size: 0.8rem;
            color: #2a4a6a;
            margin-right: 0.3rem;
        }
        .highlight-box {
            background: #fff8ee;
            border-left: 5px solid #ff6f00;
            padding: 0.8rem 1.2rem;
            border-radius: 0 12px 12px 0;
            margin: 1.2rem 0;
        }
        .btn-top {
            position: fixed;
            bottom: 1.6rem;
            right: 1.6rem;
            background: #0b1a2b;
            color: #fff;
            width: 44px;
            height: 44px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.2rem;
            box-shadow: 0 4px 16px rgba(0, 0, 0, 0.15);
            transition: transform 0.2s, background 0.2s;
            z-index: 99;
            border: none;
            cursor: pointer;
        }
        .btn-top:hover {
            background: #ff6f00;
            transform: translateY(-3px);
        }
        .last-updated {
            font-size: 0.88rem;
            color: #5a6e7e;
            display: flex;
            align-items: center;
            gap: 0.3rem;
            margin: 0.4rem 0 0.8rem;
        }