* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        body {
            font-family: 'Segoe UI', Roboto, -apple-system, BlinkMacSystemFont, sans-serif;
            background: #f8f9fc;
            color: #1e1e2a;
            line-height: 1.7;
            font-size: 16px;
        }
        a {
            color: #2a6df4;
            text-decoration: none;
            transition: color 0.2s;
        }
        a:hover {
            color: #1a4fc1;
            text-decoration: underline;
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
            border-radius: 12px;
        }
        .container {
            max-width: 1120px;
            margin: 0 auto;
            padding: 0 24px;
        }
        .site-header {
            background: linear-gradient(135deg, #0b0e1a 0%, #1a1f33 100%);
            padding: 16px 0;
            border-bottom: 3px solid #2a6df4;
            position: sticky;
            top: 0;
            z-index: 100;
            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;
        }
        .my-logo {
            font-size: 1.8rem;
            font-weight: 700;
            color: #ffffff;
            letter-spacing: -0.5px;
            background: linear-gradient(135deg, #f7971e, #ffd200);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            transition: transform 0.2s;
        }
        .my-logo:hover {
            transform: scale(1.02);
            text-decoration: none;
        }
        .my-logo i {
            -webkit-text-fill-color: initial;
            color: #ffd200;
            margin-right: 6px;
        }
        .nav-toggle {
            display: none;
            background: none;
            border: none;
            color: #fff;
            font-size: 1.8rem;
            cursor: pointer;
            padding: 4px 12px;
            border-radius: 8px;
            transition: background 0.2s;
        }
        .nav-toggle:hover {
            background: rgba(255, 255, 255, 0.08);
        }
        .main-nav {
            display: flex;
            gap: 8px 20px;
            flex-wrap: wrap;
            align-items: center;
        }
        .main-nav a {
            color: #cfd8f0;
            font-weight: 500;
            font-size: 0.95rem;
            padding: 6px 10px;
            border-radius: 8px;
            transition: background 0.2s, color 0.2s;
        }
        .main-nav a:hover {
            background: rgba(42, 109, 244, 0.2);
            color: #fff;
            text-decoration: none;
        }
        .main-nav a i {
            margin-right: 6px;
            font-size: 0.85rem;
        }
        .breadcrumb {
            background: #eef1f7;
            padding: 12px 0;
            font-size: 0.9rem;
            border-bottom: 1px solid #dce1ec;
        }
        .breadcrumb .container {
            display: flex;
            flex-wrap: wrap;
            gap: 6px 10px;
        }
        .breadcrumb span {
            color: #4a5568;
        }
        .breadcrumb a {
            color: #2a6df4;
        }
        .breadcrumb a:hover {
            text-decoration: underline;
        }
        .breadcrumb .sep {
            color: #8896b0;
        }
        h1 {
            font-size: 2.6rem;
            font-weight: 800;
            margin: 0 0 12px 0;
            line-height: 1.2;
            color: #0b0e1a;
        }
        h2 {
            font-size: 2rem;
            font-weight: 700;
            margin: 48px 0 16px 0;
            padding-bottom: 8px;
            border-bottom: 3px solid #2a6df4;
            color: #0b0e1a;
        }
        h3 {
            font-size: 1.5rem;
            font-weight: 600;
            margin: 36px 0 12px 0;
            color: #1a1f33;
        }
        h4 {
            font-size: 1.2rem;
            font-weight: 600;
            margin: 24px 0 8px 0;
            color: #2d3748;
        }
        .content-area {
            padding: 40px 0 60px;
        }
        .content-area p {
            margin-bottom: 18px;
            font-size: 1.05rem;
            color: #2d3748;
        }
        .content-area ul,
        .content-area ol {
            margin: 16px 0 20px 28px;
        }
        .content-area li {
            margin-bottom: 8px;
            font-size: 1.02rem;
        }
        .feature-img {
            margin: 28px 0 32px;
            border-radius: 14px;
            box-shadow: 0 8px 30px rgba(0, 0, 0, 0.10);
        }
        .highlight-box {
            background: linear-gradient(135deg, #eef3ff, #ffffff);
            border-left: 5px solid #2a6df4;
            padding: 20px 28px;
            border-radius: 12px;
            margin: 28px 0;
            box-shadow: 0 2px 12px rgba(0, 0, 0, 0.04);
        }
        .highlight-box p:last-child {
            margin-bottom: 0;
        }
        .emoji-big {
            font-size: 1.4rem;
        }
        .last-updated {
            display: inline-block;
            background: #eef1f7;
            padding: 6px 18px;
            border-radius: 30px;
            font-size: 0.9rem;
            color: #4a5568;
            margin-bottom: 20px;
        }
        .last-updated i {
            margin-right: 6px;
        }
        .interaction-forms {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 30px;
            margin: 50px 0 30px;
        }
        .form-card {
            background: #ffffff;
            border-radius: 16px;
            padding: 28px 30px;
            box-shadow: 0 4px 20px rgba(0, 0, 0, 0.05);
            border: 1px solid #e4e9f2;
        }
        .form-card h3 {
            margin-top: 0;
            font-size: 1.4rem;
            border-bottom: 2px solid #eef1f7;
            padding-bottom: 12px;
        }
        .form-card label {
            display: block;
            font-weight: 600;
            margin: 16px 0 4px;
            font-size: 0.95rem;
        }
        .form-card input,
        .form-card textarea,
        .form-card select {
            width: 100%;
            padding: 12px 16px;
            border: 1.5px solid #dce1ec;
            border-radius: 10px;
            font-size: 1rem;
            font-family: inherit;
            transition: border 0.2s, box-shadow 0.2s;
            background: #fafbfc;
        }
        .form-card input:focus,
        .form-card textarea:focus,
        .form-card select:focus {
            outline: none;
            border-color: #2a6df4;
            box-shadow: 0 0 0 3px rgba(42, 109, 244, 0.12);
        }
        .form-card textarea {
            min-height: 100px;
            resize: vertical;
        }
        .btn {
            background: #2a6df4;
            color: #fff;
            border: none;
            padding: 12px 28px;
            border-radius: 30px;
            font-size: 1rem;
            font-weight: 600;
            cursor: pointer;
            transition: background 0.25s, transform 0.15s;
            margin-top: 12px;
            display: inline-block;
        }
        .btn:hover {
            background: #1a4fc1;
            transform: translateY(-2px);
        }
        .btn i {
            margin-right: 8px;
        }
        .star-rating {
            display: flex;
            gap: 6px;
            font-size: 1.8rem;
            color: #d1d6e0;
            cursor: pointer;
            margin: 6px 0 8px;
        }
        .star-rating i {
            transition: color 0.15s, transform 0.15s;
        }
        .star-rating i:hover,
        .star-rating i.active {
            color: #f5a623;
            transform: scale(1.1);
        }
        friend-link {
            display: block;
            padding: 30px 0 10px;
            font-style: normal;
        }
        friend-link a {
            display: inline-block;
            margin: 6px 18px 6px 0;
            font-weight: 500;
        }
        friend-link a i {
            margin-right: 6px;
        }
        .site-footer {
            background: #0b0e1a;
            color: #b0bcd4;
            padding: 32px 0 28px;
            margin-top: 50px;
            border-top: 3px solid #2a6df4;
        }
        .site-footer .container {
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            gap: 20px;
        }
        .site-footer .copy {
            font-size: 0.95rem;
        }
        .site-footer .copy a {
            color: #8fa4d8;
        }
        .site-footer .copy a:hover {
            color: #fff;
        }
        @media (max-width: 820px) {
            .nav-toggle {
                display: block;
            }
            .main-nav {
                display: none;
                width: 100%;
                flex-direction: column;
                padding: 16px 0 8px;
                gap: 6px;
            }
            .main-nav.open {
                display: flex;
            }
            .main-nav a {
                padding: 10px 14px;
                border-radius: 8px;
                background: rgba(255, 255, 255, 0.04);
            }
            .interaction-forms {
                grid-template-columns: 1fr;
            }
            h1 {
                font-size: 2rem;
            }
            h2 {
                font-size: 1.6rem;
            }
            h3 {
                font-size: 1.3rem;
            }
            .header-inner {
                align-items: center;
            }
        }
        @media (max-width: 480px) {
            .container {
                padding: 0 16px;
            }
            .my-logo {
                font-size: 1.4rem;
            }
            .form-card {
                padding: 20px;
            }
            .star-rating {
                font-size: 1.5rem;
            }
        }
        .search-form {
            display: flex;
            gap: 10px;
            max-width: 560px;
            margin: 20px 0 28px;
            flex-wrap: wrap;
        }
        .search-form input {
            flex: 1;
            min-width: 180px;
            padding: 12px 18px;
            border: 1.5px solid #dce1ec;
            border-radius: 30px;
            font-size: 1rem;
            background: #fff;
            transition: border 0.2s, box-shadow 0.2s;
        }
        .search-form input:focus {
            border-color: #2a6df4;
            box-shadow: 0 0 0 3px rgba(42, 109, 244, 0.10);
            outline: none;
        }
        .search-form button {
            background: #2a6df4;
            color: #fff;
            border: none;
            padding: 12px 28px;
            border-radius: 30px;
            font-weight: 600;
            cursor: pointer;
            transition: background 0.2s;
            font-size: 1rem;
        }
        .search-form button:hover {
            background: #1a4fc1;
        }
        .toc {
            background: #ffffff;
            border: 1px solid #e4e9f2;
            border-radius: 16px;
            padding: 24px 28px;
            margin: 28px 0 36px;
            box-shadow: 0 2px 12px rgba(0, 0, 0, 0.03);
        }
        .toc h3 {
            margin-top: 0;
            font-size: 1.2rem;
        }
        .toc ul {
            list-style: none;
            margin: 12px 0 0 0;
            padding: 0;
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 6px 20px;
        }
        .toc li a {
            display: block;
            padding: 6px 0;
            border-bottom: 1px solid #f0f2f7;
        }
        @media (max-width: 600px) {
            .toc ul {
                grid-template-columns: 1fr;
            }
        }