*,
        *::before,
        *::after {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        html {
            scroll-behavior: smooth;
            font-size: 16px;
        }
        body {
            font-family: 'Segoe UI', system-ui, -apple-system, BlinkMacSystemFont, Roboto, 'Helvetica Neue', sans-serif;
            background: #f7f9fc;
            color: #1a1a2e;
            line-height: 1.7;
            padding: 0 1rem;
            max-width: 1200px;
            margin: 0 auto;
        }
        a {
            color: #d32f2f;
            text-decoration: none;
            transition: color 0.2s;
        }
        a:hover,
        a:focus-visible {
            color: #b71c1c;
            text-decoration: underline;
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
            border-radius: 12px;
        }
        ul,
        ol {
            padding-left: 1.5rem;
            margin: 1rem 0;
        }
        li {
            margin-bottom: 0.5rem;
        }
        h1,
        h2,
        h3,
        h4,
        h5,
        h6 {
            font-weight: 700;
            line-height: 1.3;
            color: #0d0d1a;
            margin-top: 1.8rem;
            margin-bottom: 0.8rem;
        }
        h1 {
            font-size: 2.8rem;
            margin-top: 1rem;
            border-bottom: 4px solid #d32f2f;
            display: inline-block;
            padding-bottom: 0.3rem;
        }
        h2 {
            font-size: 2rem;
            border-left: 6px solid #d32f2f;
            padding-left: 1rem;
            margin-top: 2.5rem;
        }
        h3 {
            font-size: 1.5rem;
            margin-top: 2rem;
            color: #2c2c44;
        }
        h4 {
            font-size: 1.2rem;
            margin-top: 1.5rem;
            color: #3d3d5c;
        }
        p {
            margin: 1rem 0;
            font-size: 1.0625rem;
        }
        .container {
            background: #ffffff;
            border-radius: 24px;
            box-shadow: 0 12px 40px rgba(0, 0, 0, 0.06);
            padding: 1.5rem 2rem 2.5rem;
            margin: 1.5rem 0 2.5rem;
        }
        .highlight {
            background: linear-gradient(120deg, #ffe0b2 0%, #ffe0b2 40%, transparent 80%);
            padding: 0 0.3rem;
            font-weight: 600;
        }
        .badge {
            display: inline-block;
            background: #d32f2f;
            color: #fff;
            font-size: 0.75rem;
            font-weight: 600;
            padding: 0.2rem 0.8rem;
            border-radius: 20px;
            letter-spacing: 0.3px;
            text-transform: uppercase;
        }
        .emoji-big {
            font-size: 1.8rem;
            vertical-align: middle;
        }
        hr {
            border: 0;
            height: 2px;
            background: linear-gradient(90deg, #d32f2f20, #d32f2f, #d32f2f20);
            margin: 2.5rem 0;
        }
        .site-header {
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            justify-content: space-between;
            padding: 1.2rem 0 0.8rem;
            border-bottom: 1px solid #e0e0e0;
            position: relative;
        }
        .my-logo {
            font-size: 2rem;
            font-weight: 800;
            letter-spacing: -0.5px;
            background: linear-gradient(135deg, #d32f2f, #b71c1c);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            text-decoration: none !important;
            display: inline-block;
        }
        .my-logo:hover {
            opacity: 0.85;
            text-decoration: none !important;
        }
        .my-logo small {
            font-size: 0.9rem;
            -webkit-text-fill-color: #555;
            color: #555;
            font-weight: 400;
            letter-spacing: 0;
        }
        .nav-toggle {
            display: none;
            background: none;
            border: 2px solid #1a1a2e;
            border-radius: 8px;
            padding: 0.4rem 0.7rem;
            font-size: 1.4rem;
            cursor: pointer;
            color: #1a1a2e;
            transition: 0.2s;
        }
        .nav-toggle:hover {
            background: #1a1a2e;
            color: #fff;
        }
        .nav-toggle:focus-visible {
            outline: 3px solid #d32f2f;
            outline-offset: 2px;
        }
        .main-nav {
            display: flex;
            flex-wrap: wrap;
            gap: 0.3rem 1.2rem;
            align-items: center;
        }
        .main-nav a {
            font-weight: 500;
            color: #1a1a2e;
            padding: 0.3rem 0;
            border-bottom: 2px solid transparent;
            transition: 0.2s;
            font-size: 0.95rem;
        }
        .main-nav a:hover,
        .main-nav a:focus-visible {
            border-bottom-color: #d32f2f;
            color: #d32f2f;
            text-decoration: none;
        }
        .main-nav a.active {
            border-bottom-color: #d32f2f;
            color: #d32f2f;
        }
        .breadcrumb {
            display: flex;
            flex-wrap: wrap;
            list-style: none;
            padding: 0.8rem 0 0.2rem;
            margin: 0;
            font-size: 0.9rem;
            color: #666;
            gap: 0.3rem 0.6rem;
        }
        .breadcrumb li+li::before {
            content: "›";
            margin-right: 0.6rem;
            color: #aaa;
            font-size: 1.2rem;
            line-height: 1;
        }
        .breadcrumb a {
            color: #555;
        }
        .breadcrumb a:hover {
            color: #d32f2f;
        }
        .breadcrumb .current {
            color: #1a1a2e;
            font-weight: 600;
        }
        .search-box {
            background: #f0f2f5;
            border-radius: 60px;
            padding: 0.1rem 0.1rem 0.1rem 1.5rem;
            display: flex;
            align-items: center;
            max-width: 480px;
            margin: 1.8rem 0 1rem;
            border: 1px solid #ddd;
            transition: 0.3s;
        }
        .search-box:focus-within {
            border-color: #d32f2f;
            box-shadow: 0 0 0 3px #d32f2f20;
        }
        .search-box input {
            flex: 1;
            border: none;
            background: transparent;
            padding: 0.8rem 0;
            font-size: 1rem;
            outline: none;
            color: #1a1a2e;
            min-width: 0;
        }
        .search-box input::placeholder {
            color: #999;
        }
        .search-box button {
            background: #d32f2f;
            color: #fff;
            border: none;
            border-radius: 60px;
            padding: 0.7rem 1.8rem;
            font-size: 1rem;
            font-weight: 600;
            cursor: pointer;
            transition: 0.2s;
            white-space: nowrap;
        }
        .search-box button:hover {
            background: #b71c1c;
            transform: scale(1.02);
        }
        .search-box button:focus-visible {
            outline: 3px solid #b71c1c;
            outline-offset: 2px;
        }
        .code-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
            gap: 1.2rem;
            margin: 1.5rem 0;
        }
        .code-card {
            background: #fafbfc;
            border: 1px solid #eaeef2;
            border-radius: 16px;
            padding: 1.2rem 1.5rem;
            transition: 0.25s ease;
            box-shadow: 0 2px 8px rgba(0, 0, 0, 0.02);
        }
        .code-card:hover {
            transform: translateY(-4px);
            box-shadow: 0 12px 24px rgba(0, 0, 0, 0.07);
            border-color: #d32f2f40;
        }
        .code-card .song-title {
            font-weight: 700;
            font-size: 1.1rem;
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        .code-card .song-title .id-code {
            font-family: 'Courier New', monospace;
            background: #1a1a2e;
            color: #f5c542;
            padding: 0.2rem 0.8rem;
            border-radius: 40px;
            font-size: 0.85rem;
            letter-spacing: 0.5px;
        }
        .code-card .song-meta {
            font-size: 0.9rem;
            color: #666;
            margin-top: 0.4rem;
            display: flex;
            gap: 1rem;
            flex-wrap: wrap;
        }
        .code-card .song-meta i {
            color: #d32f2f;
            width: 1.2rem;
        }
        .interact-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 2rem;
            margin: 2.5rem 0 1.5rem;
        }
        @media (max-width:680px) {
            .interact-grid {
                grid-template-columns: 1fr;
                gap: 1.5rem;
            }
        }
        .interact-card {
            background: #f7f9fc;
            border-radius: 20px;
            padding: 1.8rem 2rem;
            border: 1px solid #eaeef2;
        }
        .interact-card h3 {
            margin-top: 0;
            display: flex;
            align-items: center;
            gap: 0.6rem;
            font-size: 1.3rem;
        }
        .interact-card form {
            display: flex;
            flex-direction: column;
            gap: 0.8rem;
            margin-top: 1rem;
        }
        .interact-card input,
        .interact-card textarea,
        .interact-card select {
            padding: 0.7rem 1rem;
            border: 1px solid #d0d5dd;
            border-radius: 12px;
            font-size: 0.95rem;
            font-family: inherit;
            background: #fff;
            transition: 0.2s;
        }
        .interact-card input:focus,
        .interact-card textarea:focus,
        .interact-card select:focus {
            border-color: #d32f2f;
            outline: none;
            box-shadow: 0 0 0 3px #d32f2f20;
        }
        .interact-card textarea {
            min-height: 80px;
            resize: vertical;
        }
        .interact-card .btn-submit {
            background: #d32f2f;
            color: #fff;
            border: none;
            padding: 0.7rem 1.5rem;
            border-radius: 60px;
            font-weight: 600;
            font-size: 1rem;
            cursor: pointer;
            transition: 0.2s;
            align-self: flex-start;
        }
        .interact-card .btn-submit:hover {
            background: #b71c1c;
            transform: scale(1.02);
        }
        .star-rating {
            display: flex;
            flex-direction: row-reverse;
            justify-content: flex-end;
            gap: 0.3rem;
            margin: 0.2rem 0;
        }
        .star-rating input {
            display: none;
        }
        .star-rating label {
            font-size: 1.8rem;
            color: #d0d5dd;
            cursor: pointer;
            transition: 0.2s;
        }
        .star-rating label:hover,
        .star-rating label:hover~label,
        .star-rating input:checked~label {
            color: #f5a623;
        }
        .site-footer {
            border-top: 1px solid #e0e0e0;
            padding: 2rem 0 1.5rem;
            margin-top: 3rem;
        }
        .site-footer friend-link {
            display: block;
            font-weight: 600;
            font-size: 1.1rem;
            margin-bottom: 0.8rem;
            color: #1a1a2e;
        }
        .friend-links-list {
            display: flex;
            flex-wrap: wrap;
            gap: 0.6rem 1.5rem;
            list-style: none;
            padding: 0;
            margin: 0.5rem 0 1.5rem;
        }
        .friend-links-list li a {
            color: #555;
            font-size: 0.95rem;
            border-bottom: 1px dotted #ccc;
        }
        .friend-links-list li a:hover {
            color: #d32f2f;
            border-bottom-color: #d32f2f;
        }
        .copyright {
            font-size: 0.9rem;
            color: #888;
            border-top: 1px solid #eee;
            padding-top: 1.2rem;
            margin-top: 0.8rem;
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            gap: 0.5rem;
        }
        @media (max-width:768px) {
            body {
                padding: 0 0.6rem;
            }
            .container {
                padding: 1rem 1.2rem 1.8rem;
                border-radius: 16px;
            }
            h1 {
                font-size: 2rem;
            }
            h2 {
                font-size: 1.5rem;
            }
            h3 {
                font-size: 1.25rem;
            }
            .site-header {
                padding-top: 0.8rem;
            }
            .my-logo {
                font-size: 1.5rem;
            }
            .main-nav {
                display: none;
                flex-direction: column;
                width: 100%;
                background: #fff;
                padding: 1rem 0 0.5rem;
                border-top: 1px solid #e0e0e0;
                margin-top: 0.8rem;
                gap: 0.2rem;
            }
            .main-nav.open {
                display: flex;
            }
            .nav-toggle {
                display: inline-block;
            }
            .search-box {
                max-width: 100%;
                flex-wrap: wrap;
                border-radius: 30px;
                padding: 0.3rem 0.3rem 0.3rem 1rem;
            }
            .search-box input {
                padding: 0.5rem 0;
                font-size: 0.95rem;
                min-width: 120px;
            }
            .search-box button {
                padding: 0.5rem 1.2rem;
                font-size: 0.9rem;
            }
            .code-grid {
                grid-template-columns: 1fr;
            }
            .breadcrumb {
                font-size: 0.8rem;
            }
        }
        @media (max-width:420px) {
            h1 {
                font-size: 1.6rem;
            }
            .container {
                padding: 0.8rem 0.8rem 1.2rem;
            }
            .interact-card {
                padding: 1.2rem;
            }
            .star-rating label {
                font-size: 1.5rem;
            }
        }
        .last-updated {
            display: inline-block;
            background: #eef2f7;
            padding: 0.2rem 1rem;
            border-radius: 40px;
            font-size: 0.85rem;
            color: #555;
            margin: 0.5rem 0 1rem;
        }
        .last-updated i {
            margin-right: 0.4rem;
            color: #d32f2f;
        }
        .table-wrap {
            overflow-x: auto;
            margin: 1.5rem 0;
        }
        table {
            width: 100%;
            border-collapse: collapse;
            font-size: 0.95rem;
        }
        th,
        td {
            padding: 0.7rem 1rem;
            text-align: left;
            border-bottom: 1px solid #eaeef2;
        }
        th {
            background: #f0f2f5;
            font-weight: 700;
            color: #1a1a2e;
        }
        tr:hover td {
            background: #fafbfc;
        }
        .tip-box {
            background: #fff8e1;
            border-left: 6px solid #f5a623;
            padding: 1rem 1.5rem;
            border-radius: 0 12px 12px 0;
            margin: 1.5rem 0;
        }
        .tip-box strong {
            color: #b71c1c;
        }
        .feature-icon {
            font-size: 2rem;
            color: #d32f2f;
            margin-right: 0.8rem;
        }
        .flex-features {
            display: flex;
            flex-wrap: wrap;
            gap: 1.2rem;
            margin: 1.5rem 0;
        }
        .flex-features .feat {
            flex: 1 1 200px;
            background: #fafbfc;
            padding: 1.2rem 1.2rem;
            border-radius: 16px;
            border: 1px solid #eaeef2;
            display: flex;
            align-items: flex-start;
            gap: 0.8rem;
        }
        .flex-features .feat i {
            font-size: 1.6rem;
            color: #d32f2f;
            margin-top: 0.2rem;
        }
        @media (max-width:600px) {
            .flex-features .feat {
                flex: 1 1 100%;
            }
        }