*,
        *::before,
        *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }
        html {
            scroll-behavior: smooth;
        }
        body {
            font-family: 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
            background: #f5f7fb;
            color: #1a1a2e;
            line-height: 1.7;
            font-size: 16px;
            padding: 0 16px;
        }
        a {
            color: #0066cc;
            text-decoration: none;
            transition: color 0.2s;
        }
        a:hover {
            color: #004499;
            text-decoration: underline;
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        h1,
        h2,
        h3,
        h4,
        h5,
        h6 {
            font-weight: 700;
            line-height: 1.3;
            margin-top: 1.6em;
            margin-bottom: 0.6em;
            color: #0d1b2a;
        }
        h1 {
            font-size: 2.2rem;
            margin-top: 0.4em;
        }
        h2 {
            font-size: 1.8rem;
            border-left: 5px solid #e63946;
            padding-left: 16px;
        }
        h3 {
            font-size: 1.4rem;
            color: #1d3557;
        }
        h4 {
            font-size: 1.15rem;
            color: #2a4d6e;
        }
        p {
            margin-bottom: 1.2em;
        }
        ul,
        ol {
            margin-bottom: 1.2em;
            padding-left: 28px;
        }
        li {
            margin-bottom: 0.5em;
        }
        strong {
            color: #0d1b2a;
        }
        .container {
            max-width: 1120px;
            margin: 0 auto;
            background: #ffffff;
            box-shadow: 0 0 40px rgba(0, 0, 0, 0.04);
            border-radius: 24px;
            padding: 20px 28px 40px;
            margin-top: 20px;
            margin-bottom: 40px;
        }
        .section-spacing {
            margin-top: 3rem;
        }
        .emoji-big {
            font-size: 1.6rem;
            margin-right: 6px;
        }
        .site-header {
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            justify-content: space-between;
            padding: 16px 0 12px;
            border-bottom: 2px solid #e9ecef;
            position: relative;
        }
        .my-logo {
            font-size: 2rem;
            font-weight: 800;
            color: #e63946;
            letter-spacing: -0.5px;
            text-decoration: none;
            background: linear-gradient(145deg, #e63946, #b71c1c);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }
        .my-logo:hover {
            text-decoration: none;
            opacity: 0.85;
        }
        .my-logo span {
            font-weight: 300;
            color: #1d3557;
            -webkit-text-fill-color: #1d3557;
        }
        .nav-toggle {
            display: none;
            background: none;
            border: none;
            font-size: 1.8rem;
            color: #1a1a2e;
            cursor: pointer;
            padding: 4px 10px;
            border-radius: 8px;
            transition: background 0.2s;
        }
        .nav-toggle:hover {
            background: #e9ecef;
        }
        .main-nav {
            display: flex;
            flex-wrap: wrap;
            gap: 8px 18px;
            align-items: center;
        }
        .main-nav a {
            font-weight: 500;
            color: #1a1a2e;
            padding: 6px 0;
            border-bottom: 2px solid transparent;
            transition: border-color 0.2s, color 0.2s;
        }
        .main-nav a:hover {
            border-bottom-color: #e63946;
            color: #e63946;
            text-decoration: none;
        }
        .main-nav a.active {
            border-bottom-color: #e63946;
            color: #e63946;
        }
        .breadcrumb {
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            gap: 6px 12px;
            padding: 12px 0 8px;
            font-size: 0.9rem;
            color: #6c757d;
            border-bottom: 1px solid #e9ecef;
            margin-bottom: 20px;
        }
        .breadcrumb a {
            color: #0066cc;
        }
        .breadcrumb a:hover {
            text-decoration: underline;
        }
        .breadcrumb .sep {
            color: #adb5bd;
        }
        .breadcrumb .current {
            color: #343a40;
            font-weight: 500;
        }
        .search-block {
            display: flex;
            max-width: 520px;
            margin: 20px 0 24px;
            border-radius: 60px;
            overflow: hidden;
            box-shadow: 0 2px 12px rgba(0, 0, 0, 0.06);
            border: 1px solid #dee2e6;
            transition: box-shadow 0.3s;
        }
        .search-block:focus-within {
            box-shadow: 0 4px 20px rgba(230, 57, 70, 0.15);
            border-color: #e63946;
        }
        .search-block input {
            flex: 1;
            padding: 14px 22px;
            border: none;
            outline: none;
            font-size: 1rem;
            background: #fff;
            min-width: 0;
        }
        .search-block button {
            background: #e63946;
            color: #fff;
            border: none;
            padding: 14px 28px;
            font-size: 1rem;
            cursor: pointer;
            transition: background 0.2s;
            font-weight: 600;
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .search-block button:hover {
            background: #b71c1c;
        }
        .toc {
            background: #f8f9fa;
            border-radius: 16px;
            padding: 20px 26px;
            margin: 24px 0 32px;
            border: 1px solid #e9ecef;
        }
        .toc-title {
            font-size: 1.2rem;
            font-weight: 700;
            margin-bottom: 12px;
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .toc ol {
            padding-left: 24px;
            columns: 2;
            column-gap: 40px;
        }
        .toc li {
            margin-bottom: 6px;
            break-inside: avoid;
        }
        .toc a {
            color: #1d3557;
        }
        .toc a:hover {
            color: #e63946;
        }
        @media (max-width:640px) {
            .toc ol {
                columns: 1;
            }
        }
        .featured-image {
            margin: 28px 0 30px;
            border-radius: 20px;
            overflow: hidden;
            box-shadow: 0 8px 30px rgba(0, 0, 0, 0.08);
            background: #e9ecef;
        }
        .featured-image img {
            width: 100%;
            object-fit: cover;
            aspect-ratio: 16/9;
        }
        .featured-image figcaption {
            padding: 12px 20px;
            font-size: 0.9rem;
            color: #495057;
            background: #f8f9fa;
            border-top: 1px solid #e9ecef;
        }
        .interaction-panel {
            display: flex;
            flex-wrap: wrap;
            gap: 24px 40px;
            margin: 36px 0 20px;
            padding: 24px 28px;
            background: #f8f9fa;
            border-radius: 20px;
            border: 1px solid #e9ecef;
        }
        .interaction-panel form {
            flex: 1;
            min-width: 220px;
        }
        .interaction-panel label {
            font-weight: 600;
            display: block;
            margin-bottom: 6px;
            font-size: 0.95rem;
        }
        .interaction-panel input,
        .interaction-panel textarea,
        .interaction-panel select {
            width: 100%;
            padding: 10px 14px;
            border: 1px solid #ced4da;
            border-radius: 10px;
            font-size: 0.95rem;
            background: #fff;
            transition: border 0.2s;
            font-family: inherit;
        }
        .interaction-panel input:focus,
        .interaction-panel textarea:focus,
        .interaction-panel select:focus {
            border-color: #e63946;
            outline: none;
            box-shadow: 0 0 0 3px rgba(230, 57, 70, 0.12);
        }
        .interaction-panel textarea {
            min-height: 70px;
            resize: vertical;
        }
        .interaction-panel .btn-submit {
            background: #e63946;
            color: #fff;
            border: none;
            padding: 10px 28px;
            border-radius: 60px;
            font-weight: 600;
            font-size: 0.95rem;
            cursor: pointer;
            transition: background 0.2s, transform 0.1s;
            margin-top: 8px;
        }
        .interaction-panel .btn-submit:hover {
            background: #b71c1c;
            transform: scale(1.02);
        }
        .rating-stars {
            display: flex;
            flex-direction: row-reverse;
            gap: 4px;
            margin-top: 6px;
        }
        .rating-stars input {
            display: none;
        }
        .rating-stars label {
            font-size: 1.8rem;
            color: #ced4da;
            cursor: pointer;
            transition: color 0.15s;
        }
        .rating-stars input:checked~label,
        .rating-stars label:hover,
        .rating-stars label:hover~label {
            color: #f4a261;
        }
        .site-footer {
            margin-top: 48px;
            padding-top: 28px;
            border-top: 2px solid #e9ecef;
            font-size: 0.95rem;
            color: #495057;
        }
        .site-footer friend-link {
            display: block;
            margin-bottom: 16px;
        }
        .site-footer friend-link a {
            display: inline-block;
            margin: 4px 12px 4px 0;
            padding: 4px 0;
        }
        .copyright {
            padding: 16px 0 8px;
            font-size: 0.9rem;
            color: #6c757d;
            border-top: 1px solid #e9ecef;
            margin-top: 12px;
            text-align: center;
        }
        @media (max-width:768px) {
            body {
                padding: 0 8px;
            }
            .container {
                padding: 12px 14px 30px;
                border-radius: 16px;
                margin-top: 10px;
            }
            h1 {
                font-size: 1.7rem;
            }
            h2 {
                font-size: 1.4rem;
                padding-left: 12px;
            }
            h3 {
                font-size: 1.2rem;
            }
            .site-header {
                flex-wrap: wrap;
            }
            .main-nav {
                display: none;
                width: 100%;
                flex-direction: column;
                align-items: flex-start;
                padding: 16px 0 8px;
                gap: 6px;
                border-top: 1px solid #e9ecef;
                margin-top: 12px;
            }
            .main-nav.open {
                display: flex;
            }
            .nav-toggle {
                display: block;
            }
            .breadcrumb {
                font-size: 0.8rem;
                gap: 4px 8px;
            }
            .search-block {
                flex-direction: column;
                border-radius: 16px;
            }
            .search-block button {
                border-radius: 0 0 16px 16px;
                justify-content: center;
            }
            .interaction-panel {
                padding: 16px;
                gap: 16px;
            }
            .interaction-panel form {
                min-width: 100%;
            }
            .toc ol {
                padding-left: 18px;
            }
            .my-logo {
                font-size: 1.6rem;
            }
        }
        @media (max-width:400px) {
            .container {
                padding: 8px 10px 20px;
            }
            h1 {
                font-size: 1.4rem;
            }
            h2 {
                font-size: 1.2rem;
            }
            .rating-stars label {
                font-size: 1.5rem;
            }
        }
        .last-updated {
            display: inline-block;
            padding: 6px 16px;
            background: #e9ecef;
            border-radius: 60px;
            font-size: 0.85rem;
            color: #495057;
            margin-bottom: 18px;
        }
        .highlight-box {
            background: #fff3e0;
            border-left: 5px solid #f4a261;
            padding: 18px 22px;
            border-radius: 0 12px 12px 0;
            margin: 20px 0;
        }
        .quote-block {
            font-style: italic;
            background: #e8f4f8;
            padding: 20px 24px;
            border-radius: 16px;
            margin: 20px 0;
            position: relative;
        }
        .quote-block::before {
            content: '\201C';
            font-size: 3rem;
            color: #e63946;
            position: absolute;
            top: -6px;
            left: 12px;
            opacity: 0.3;
        }
        .btn-top {
            position: fixed;
            bottom: 30px;
            right: 30px;
            background: #e63946;
            color: #fff;
            width: 48px;
            height: 48px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.4rem;
            box-shadow: 0 4px 16px rgba(230, 57, 70, 0.3);
            transition: transform 0.2s, opacity 0.3s;
            opacity: 0.7;
            z-index: 99;
            border: none;
            cursor: pointer;
        }
        .btn-top:hover {
            transform: scale(1.08);
            opacity: 1;
        }
        @media (max-width:600px) {
            .btn-top {
                bottom: 16px;
                right: 16px;
                width: 40px;
                height: 40px;
                font-size: 1.1rem;
            }
        }
        .friend-link-grid {
            display: flex;
            flex-wrap: wrap;
            gap: 6px 18px;
        }