*,
        *::before,
        *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }
        html {
            scroll-behavior: smooth;
            font-size: 16px;
        }
        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            background: #f5f7fa;
            color: #1a2a3a;
            line-height: 1.8;
            padding: 0;
            margin: 0;
        }
        a {
            text-decoration: none;
            color: #0066cc;
            transition: color 0.2s ease;
        }
        a:hover {
            color: #004499;
            text-decoration: underline;
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
            border-radius: 12px;
        }
        ul,
        ol {
            padding-left: 1.6rem;
            margin-bottom: 1rem;
        }
        li {
            margin-bottom: 0.4rem;
        }
        h1,
        h2,
        h3,
        h4,
        h5,
        h6 {
            font-weight: 700;
            line-height: 1.3;
            margin-top: 0;
            color: #0a1a2a;
        }
        h1 {
            font-size: 2.4rem;
            margin-bottom: 1.2rem;
            border-bottom: 4px solid #ff6b35;
            padding-bottom: 0.6rem;
        }
        h2 {
            font-size: 1.8rem;
            margin-bottom: 1rem;
            margin-top: 2.4rem;
            border-left: 6px solid #ff6b35;
            padding-left: 1rem;
        }
        h3 {
            font-size: 1.4rem;
            margin-bottom: 0.8rem;
            margin-top: 1.8rem;
            color: #1e3a5f;
        }
        h4 {
            font-size: 1.15rem;
            margin-bottom: 0.6rem;
            margin-top: 1.2rem;
            color: #2a4a6a;
        }
        p {
            margin-bottom: 1rem;
        }
        strong {
            color: #0a1a2a;
        }
        .container {
            max-width: 1120px;
            margin: 0 auto;
            padding: 0 1.2rem;
        }
        header {
            background: linear-gradient(145deg, #0a1a2a 0%, #1a3a5a 100%);
            padding: 0.8rem 0;
            position: sticky;
            top: 0;
            z-index: 1000;
            box-shadow: 0 4px 20px rgba(0, 0, 0, 0.25);
        }
        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            flex-wrap: wrap;
            max-width: 1120px;
            margin: 0 auto;
            padding: 0 1.2rem;
        }
        .my-logo {
            font-size: 1.6rem;
            font-weight: 800;
            color: #fff;
            letter-spacing: -0.5px;
            background: linear-gradient(135deg, #ff6b35, #ffb347);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            transition: transform 0.2s ease;
            display: inline-block;
        }
        .my-logo:hover {
            transform: scale(1.02);
            text-decoration: none;
        }
        .my-logo i {
            -webkit-text-fill-color: #ff6b35;
            margin-right: 0.4rem;
        }
        .hamburger {
            display: none;
            font-size: 1.8rem;
            color: #fff;
            cursor: pointer;
            background: none;
            border: none;
            padding: 0.3rem 0.6rem;
            border-radius: 6px;
            transition: background 0.2s;
        }
        .hamburger:hover {
            background: rgba(255, 255, 255, 0.1);
        }
        nav {
            display: flex;
            gap: 0.2rem;
            flex-wrap: wrap;
            align-items: center;
        }
        nav a {
            color: #dde6f0;
            padding: 0.5rem 1rem;
            border-radius: 8px;
            font-size: 0.9rem;
            font-weight: 500;
            transition: background 0.2s, color 0.2s;
            white-space: nowrap;
        }
        nav a:hover {
            background: rgba(255, 107, 53, 0.25);
            color: #ffb347;
            text-decoration: none;
        }
        nav a i {
            margin-right: 0.4rem;
            font-size: 0.85rem;
        }
        .breadcrumb {
            background: #eef2f7;
            padding: 0.6rem 0;
            font-size: 0.85rem;
            border-bottom: 1px solid #dce3ec;
        }
        .breadcrumb .container {
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            gap: 0.4rem;
        }
        .breadcrumb a {
            color: #2a5a7a;
        }
        .breadcrumb a:hover {
            color: #ff6b35;
        }
        .breadcrumb span {
            color: #6a7a8a;
        }
        .breadcrumb .sep {
            color: #9aabba;
            margin: 0 0.2rem;
        }
        .hero {
            background: linear-gradient(135deg, #0f2a40 0%, #1e4a6a 100%);
            color: #fff;
            padding: 2.4rem 0 2rem;
            margin-bottom: 2rem;
            border-radius: 0 0 40px 40px;
        }
        .hero .container {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 2rem;
            align-items: center;
        }
        .hero h1 {
            color: #fff;
            border-bottom-color: #ff6b35;
            font-size: 2.2rem;
            margin-bottom: 0.8rem;
        }
        .hero p {
            font-size: 1.1rem;
            opacity: 0.92;
            margin-bottom: 1.2rem;
            line-height: 1.7;
        }
        .hero .meta {
            font-size: 0.9rem;
            opacity: 0.75;
            display: flex;
            gap: 1.6rem;
            flex-wrap: wrap;
        }
        .hero .meta i {
            margin-right: 0.3rem;
        }
        .hero figure {
            margin: 0;
            border-radius: 16px;
            overflow: hidden;
            box-shadow: 0 12px 40px rgba(0, 0, 0, 0.35);
        }
        .hero figure img {
            width: 100%;
            height: auto;
            object-fit: cover;
            border-radius: 16px;
        }
        .main-grid {
            display: grid;
            grid-template-columns: 1fr 280px;
            gap: 2.4rem;
            margin: 2rem 0 3rem;
        }
        .content-area {
            background: #fff;
            border-radius: 20px;
            padding: 2.2rem 2rem;
            box-shadow: 0 4px 24px rgba(0, 0, 0, 0.05);
        }
        .sidebar {
            background: #fff;
            border-radius: 20px;
            padding: 1.6rem 1.4rem;
            box-shadow: 0 4px 24px rgba(0, 0, 0, 0.05);
            height: fit-content;
            position: sticky;
            top: 5.6rem;
        }
        .sidebar h3 {
            font-size: 1.2rem;
            margin-top: 0;
            border-bottom: 2px solid #ff6b35;
            padding-bottom: 0.4rem;
            margin-bottom: 1rem;
        }
        .sidebar ul {
            list-style: none;
            padding: 0;
        }
        .sidebar li {
            margin-bottom: 0.5rem;
        }
        .sidebar a {
            display: block;
            padding: 0.4rem 0.6rem;
            border-radius: 6px;
            font-size: 0.9rem;
            transition: background 0.2s;
        }
        .sidebar a:hover {
            background: #f0f4fa;
            text-decoration: none;
        }
        .sidebar a i {
            color: #ff6b35;
            margin-right: 0.5rem;
            font-size: 0.8rem;
        }
        .toc {
            background: #f0f6fe;
            border-radius: 14px;
            padding: 1.4rem 1.8rem;
            margin-bottom: 2rem;
            border-left: 4px solid #ff6b35;
        }
        .toc h3 {
            margin-top: 0;
            font-size: 1.2rem;
        }
        .toc ol {
            margin-bottom: 0;
            columns: 2;
            column-gap: 2rem;
        }
        .toc li {
            margin-bottom: 0.3rem;
            font-size: 0.95rem;
            break-inside: avoid;
        }
        .toc a {
            color: #1a3a5a;
        }
        .toc a:hover {
            color: #ff6b35;
        }
        .link-card {
            background: #f8fafc;
            border-radius: 12px;
            padding: 0.8rem 1.2rem;
            margin: 1.2rem 0;
            border-left: 4px solid #ff6b35;
            transition: background 0.2s, transform 0.2s;
        }
        .link-card:hover {
            background: #eef4fa;
            transform: translateX(4px);
        }
        .link-card a {
            font-weight: 600;
            font-size: 1rem;
        }
        .link-card a i {
            margin-right: 0.5rem;
            color: #ff6b35;
        }
        .link-card .desc {
            font-size: 0.9rem;
            color: #4a5a6a;
            margin-top: 0.2rem;
        }
        .interaction-section {
            background: #f8fafc;
            border-radius: 16px;
            padding: 1.8rem 2rem;
            margin: 2.4rem 0 1.6rem;
            border: 1px solid #e4ecf4;
        }
        .interaction-section h3 {
            margin-top: 0;
            display: flex;
            align-items: center;
            gap: 0.6rem;
        }
        .interaction-section .row {
            display: flex;
            flex-wrap: wrap;
            gap: 1.6rem;
            margin-top: 1rem;
        }
        .interaction-section .col {
            flex: 1 1 240px;
        }
        .interaction-section label {
            display: block;
            font-weight: 600;
            font-size: 0.9rem;
            margin-bottom: 0.3rem;
            color: #1a3a5a;
        }
        .interaction-section input,
        .interaction-section textarea,
        .interaction-section select {
            width: 100%;
            padding: 0.6rem 0.8rem;
            border: 1px solid #c8d4e0;
            border-radius: 8px;
            font-size: 0.95rem;
            font-family: inherit;
            transition: border 0.2s;
            background: #fff;
        }
        .interaction-section input:focus,
        .interaction-section textarea:focus,
        .interaction-section select:focus {
            border-color: #ff6b35;
            outline: none;
            box-shadow: 0 0 0 3px rgba(255, 107, 53, 0.15);
        }
        .interaction-section textarea {
            min-height: 80px;
            resize: vertical;
        }
        .interaction-section .btn {
            background: #ff6b35;
            color: #fff;
            border: none;
            padding: 0.6rem 1.6rem;
            border-radius: 8px;
            font-weight: 600;
            font-size: 0.95rem;
            cursor: pointer;
            transition: background 0.2s, transform 0.15s;
            display: inline-flex;
            align-items: center;
            gap: 0.5rem;
        }
        .interaction-section .btn:hover {
            background: #e55a2b;
            transform: translateY(-1px);
        }
        .interaction-section .btn:active {
            transform: translateY(0);
        }
        .star-rating {
            display: flex;
            flex-direction: row-reverse;
            gap: 0.2rem;
            justify-content: flex-end;
        }
        .star-rating input {
            display: none;
        }
        .star-rating label {
            font-size: 1.6rem;
            color: #d0d8e0;
            cursor: pointer;
            transition: color 0.2s;
            flex: 0 0 auto;
            width: auto;
            padding: 0;
        }
        .star-rating label:hover,
        .star-rating label:hover~label,
        .star-rating input:checked~label {
            color: #ffb347;
        }
        footer {
            background: #0a1a2a;
            color: #b0c8d8;
            padding: 2.4rem 0 1.2rem;
            margin-top: 2rem;
            border-radius: 40px 40px 0 0;
        }
        footer .container {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr;
            gap: 2rem;
        }
        footer h4 {
            color: #fff;
            font-size: 1.1rem;
            margin-bottom: 0.8rem;
            border-bottom: 2px solid #ff6b35;
            padding-bottom: 0.3rem;
            display: inline-block;
        }
        footer a {
            color: #9ab8d0;
        }
        footer a:hover {
            color: #ffb347;
        }
        friend-link {
            display: block;
            margin-top: 0.6rem;
        }
        friend-link a {
            display: block;
            padding: 0.2rem 0;
            font-size: 0.9rem;
        }
        friend-link a i {
            margin-right: 0.4rem;
            font-size: 0.75rem;
            color: #ff6b35;
        }
        .copyright {
            grid-column: 1 / -1;
            border-top: 1px solid #1a3a5a;
            padding-top: 1.2rem;
            margin-top: 1.2rem;
            text-align: center;
            font-size: 0.85rem;
            color: #7a9aaa;
        }
        .copyright strong {
            color: #d0e0f0;
        }
        @media (max-width: 900px) {
            .hero .container {
                grid-template-columns: 1fr;
            }
            .hero h1 {
                font-size: 1.8rem;
            }
            .main-grid {
                grid-template-columns: 1fr;
            }
            .sidebar {
                position: static;
                order: 2;
            }
            .toc ol {
                columns: 1;
            }
            footer .container {
                grid-template-columns: 1fr 1fr;
            }
        }
        @media (max-width: 700px) {
            .hamburger {
                display: block;
            }
            nav {
                display: none;
                width: 100%;
                flex-direction: column;
                align-items: flex-start;
                padding: 0.8rem 0 0.4rem;
                gap: 0.1rem;
            }
            nav.open {
                display: flex;
            }
            nav a {
                width: 100%;
                padding: 0.6rem 0.8rem;
                border-radius: 6px;
            }
            .header-inner {
                align-items: center;
            }
            h1 {
                font-size: 1.7rem;
            }
            h2 {
                font-size: 1.4rem;
            }
            h3 {
                font-size: 1.15rem;
            }
            .content-area {
                padding: 1.4rem 1rem;
            }
            .interaction-section {
                padding: 1.2rem 1rem;
            }
            footer .container {
                grid-template-columns: 1fr;
                gap: 1.4rem;
            }
            .hero {
                padding: 1.6rem 0 1.2rem;
                border-radius: 0 0 24px 24px;
            }
            .hero .meta {
                flex-direction: column;
                gap: 0.4rem;
            }
        }
        @media (max-width: 480px) {
            html {
                font-size: 15px;
            }
            .container {
                padding: 0 0.8rem;
            }
            .my-logo {
                font-size: 1.3rem;
            }
            h1 {
                font-size: 1.5rem;
            }
            .interaction-section .row {
                flex-direction: column;
                gap: 1rem;
            }
            .star-rating label {
                font-size: 1.4rem;
            }
        }
        .updated-badge {
            display: inline-flex;
            align-items: center;
            gap: 0.4rem;
            background: #e8f0f8;
            padding: 0.3rem 1rem;
            border-radius: 30px;
            font-size: 0.8rem;
            color: #1a4a6a;
            font-weight: 500;
        }
        .highlight-box {
            background: #fef6f0;
            border-radius: 12px;
            padding: 1.2rem 1.6rem;
            margin: 1.2rem 0;
            border: 1px solid #f5e0d0;
        }
        .highlight-box strong {
            color: #ff6b35;
        }
        .two-col {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 1.4rem;
            margin: 1.2rem 0;
        }
        @media (max-width: 600px) {
            .two-col {
                grid-template-columns: 1fr;
            }
        }
        .table-wrap {
            overflow-x: auto;
            margin: 1.2rem 0;
        }
        table {
            width: 100%;
            border-collapse: collapse;
            font-size: 0.92rem;
        }
        table th {
            background: #0a1a2a;
            color: #fff;
            padding: 0.6rem 0.8rem;
            text-align: left;
        }
        table td {
            padding: 0.5rem 0.8rem;
            border-bottom: 1px solid #e4ecf4;
        }
        table tr:hover td {
            background: #f8fafc;
        }
        .faq-item {
            border-bottom: 1px solid #e4ecf4;
            padding: 0.8rem 0;
        }
        .faq-item strong {
            display: block;
            font-size: 1rem;
            color: #0a1a2a;
        }
        .faq-item p {
            margin: 0.3rem 0 0 0;
            font-size: 0.95rem;
        }