*,
        *::before,
        *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }
        html {
            scroll-behavior: smooth;
            font-size: 16px;
        }
        body {
            font-family: 'Segoe UI', system-ui, -apple-system, Roboto, 'Helvetica Neue', sans-serif;
            background: #f4f7fb;
            color: #1e293b;
            line-height: 1.75;
            padding: 0;
            margin: 0;
            word-wrap: break-word;
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        a {
            color: #2563eb;
            text-decoration: none;
            transition: color 0.25s ease;
        }
        a:hover,
        a:focus-visible {
            color: #1d4ed8;
            text-decoration: underline;
        }
        ul,
        ol {
            padding-left: 1.5rem;
        }
        li {
            margin-bottom: 0.35rem;
        }
        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 1.25rem;
        }
        .site-header {
            background: linear-gradient(145deg, #0f172a 0%, #1e293b 100%);
            color: #fff;
            padding: 0.85rem 0;
            position: sticky;
            top: 0;
            z-index: 1000;
            box-shadow: 0 4px 20px rgba(0, 0, 0, 0.25);
            border-bottom: 3px solid #f59e0b;
        }
        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            flex-wrap: wrap;
        }
        .my-logo {
            font-size: 1.8rem;
            font-weight: 800;
            letter-spacing: -0.02em;
            color: #f59e0b;
            text-shadow: 0 2px 8px rgba(245, 158, 11, 0.3);
            transition: transform 0.2s;
            display: flex;
            align-items: center;
            gap: 0.4rem;
        }
        .my-logo:hover {
            transform: scale(1.02);
            text-decoration: none;
            color: #fbbf24;
        }
        .my-logo i {
            font-size: 1.6rem;
            color: #ef4444;
        }
        .my-logo span {
            font-weight: 300;
            color: #cbd5e1;
            font-size: 0.9rem;
        }
        .nav-wrapper {
            display: flex;
            align-items: center;
            gap: 0.5rem;
        }
        .main-nav {
            display: flex;
            gap: 0.3rem;
            flex-wrap: wrap;
        }
        .main-nav a {
            color: #e2e8f0;
            padding: 0.5rem 1rem;
            border-radius: 40px;
            font-size: 0.9rem;
            font-weight: 500;
            transition: background 0.25s, color 0.25s;
            white-space: nowrap;
        }
        .main-nav a:hover,
        .main-nav a.active {
            background: #f59e0b;
            color: #0f172a;
            text-decoration: none;
        }
        .hamburger {
            display: none;
            background: transparent;
            border: none;
            color: #fff;
            font-size: 1.8rem;
            cursor: pointer;
            padding: 0.25rem 0.5rem;
            border-radius: 6px;
            transition: background 0.2s;
        }
        .hamburger:hover {
            background: rgba(255, 255, 255, 0.1);
        }
        .breadcrumb {
            background: #e9edf2;
            padding: 0.6rem 0;
            font-size: 0.85rem;
            border-bottom: 1px solid #d1d9e6;
        }
        .breadcrumb ol {
            display: flex;
            flex-wrap: wrap;
            list-style: none;
            padding: 0;
            margin: 0;
            gap: 0.3rem 0.6rem;
        }
        .breadcrumb li+li::before {
            content: "›";
            margin-right: 0.5rem;
            color: #64748b;
            font-weight: 600;
        }
        .breadcrumb a {
            color: #2563eb;
        }
        .breadcrumb span {
            color: #475569;
        }
        .main-grid {
            display: grid;
            grid-template-columns: 1fr 300px;
            gap: 2.5rem;
            padding: 2.5rem 0;
        }
        @media(max-width:992px) {
            .main-grid {
                grid-template-columns: 1fr;
                gap: 2rem;
            }
        }
        .content-area h1 {
            font-size: 2.6rem;
            font-weight: 800;
            line-height: 1.2;
            color: #0f172a;
            margin-bottom: 0.75rem;
            letter-spacing: -0.02em;
        }
        .content-area h1 i {
            color: #f59e0b;
        }
        .content-area h2 {
            font-size: 1.9rem;
            font-weight: 700;
            color: #1e293b;
            margin: 2.5rem 0 1rem 0;
            padding-bottom: 0.5rem;
            border-bottom: 3px solid #f59e0b;
            display: inline-block;
        }
        .content-area h3 {
            font-size: 1.45rem;
            font-weight: 600;
            color: #334155;
            margin: 2rem 0 0.75rem 0;
        }
        .content-area h4 {
            font-size: 1.2rem;
            font-weight: 600;
            color: #475569;
            margin: 1.5rem 0 0.5rem 0;
        }
        .content-area p {
            margin-bottom: 1.1rem;
        }
        .content-area strong {
            color: #0f172a;
        }
        .content-area .highlight-box {
            background: #fff;
            border-left: 5px solid #f59e0b;
            padding: 1.5rem 2rem;
            border-radius: 0 12px 12px 0;
            margin: 1.8rem 0;
            box-shadow: 0 4px 12px rgba(0, 0, 0, 0.04);
        }
        .content-area .emoji-lg {
            font-size: 1.4rem;
        }
        .featured-img {
            margin: 2rem 0;
            border-radius: 16px;
            overflow: hidden;
            box-shadow: 0 8px 30px rgba(0, 0, 0, 0.12);
            background: #e2e8f0;
        }
        .featured-img img {
            width: 100%;
            object-fit: cover;
            min-height: 240px;
            background: #cbd5e1;
        }
        .featured-img figcaption {
            padding: 0.75rem 1.25rem;
            font-size: 0.9rem;
            color: #475569;
            background: #fff;
            border-top: 1px solid #e2e8f0;
        }
        .sidebar {
            position: sticky;
            top: 100px;
            align-self: start;
        }
        .sidebar-card {
            background: #fff;
            border-radius: 16px;
            padding: 1.5rem;
            margin-bottom: 1.8rem;
            box-shadow: 0 4px 16px rgba(0, 0, 0, 0.06);
            border: 1px solid #e2e8f0;
        }
        .sidebar-card h3 {
            font-size: 1.2rem;
            font-weight: 700;
            color: #0f172a;
            margin-bottom: 1rem;
            border-bottom: 2px solid #f59e0b;
            padding-bottom: 0.5rem;
        }
        .sidebar-link-list {
            list-style: none;
            padding: 0;
        }
        .sidebar-link-list li {
            margin-bottom: 0.5rem;
        }
        .sidebar-link-list a {
            display: flex;
            align-items: center;
            gap: 0.6rem;
            padding: 0.5rem 0.75rem;
            border-radius: 8px;
            background: #f8fafc;
            transition: background 0.2s, transform 0.15s;
            font-size: 0.92rem;
        }
        .sidebar-link-list a:hover {
            background: #eef2ff;
            transform: translateX(4px);
            text-decoration: none;
        }
        .sidebar-link-list i {
            color: #f59e0b;
            width: 1.2rem;
            text-align: center;
        }
        .search-form {
            display: flex;
            gap: 0.5rem;
            margin: 1.5rem 0;
        }
        .search-form input {
            flex: 1;
            padding: 0.8rem 1.2rem;
            border: 2px solid #d1d9e6;
            border-radius: 40px;
            font-size: 1rem;
            outline: none;
            transition: border 0.25s;
            background: #fff;
        }
        .search-form input:focus {
            border-color: #f59e0b;
        }
        .search-form button {
            background: #f59e0b;
            color: #0f172a;
            border: none;
            border-radius: 40px;
            padding: 0 1.6rem;
            font-weight: 600;
            cursor: pointer;
            transition: background 0.25s, transform 0.15s;
            font-size: 1rem;
        }
        .search-form button:hover {
            background: #d97706;
            transform: scale(1.02);
        }
        .feedback-section {
            background: #fff;
            border-radius: 20px;
            padding: 2rem 2.5rem;
            margin: 3rem 0;
            box-shadow: 0 4px 20px rgba(0, 0, 0, 0.05);
            border: 1px solid #e2e8f0;
        }
        .feedback-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 2rem;
        }
        @media(max-width:768px) {
            .feedback-grid {
                grid-template-columns: 1fr;
                gap: 1.5rem;
            }
        }
        .feedback-card h3 {
            font-size: 1.3rem;
            font-weight: 700;
            margin-bottom: 1.2rem;
            color: #0f172a;
            display: flex;
            align-items: center;
            gap: 0.6rem;
        }
        .feedback-card form {
            display: flex;
            flex-direction: column;
            gap: 0.9rem;
        }
        .feedback-card input,
        .feedback-card textarea,
        .feedback-card select {
            padding: 0.75rem 1rem;
            border: 2px solid #d1d9e6;
            border-radius: 10px;
            font-size: 0.95rem;
            font-family: inherit;
            transition: border 0.2s;
            background: #fafbfc;
        }
        .feedback-card input:focus,
        .feedback-card textarea:focus,
        .feedback-card select:focus {
            border-color: #f59e0b;
            outline: none;
            background: #fff;
        }
        .feedback-card textarea {
            min-height: 100px;
            resize: vertical;
        }
        .feedback-card .btn-submit {
            background: #f59e0b;
            color: #0f172a;
            font-weight: 700;
            border: none;
            padding: 0.8rem 1.5rem;
            border-radius: 40px;
            cursor: pointer;
            transition: background 0.25s, transform 0.15s;
            font-size: 1rem;
            align-self: flex-start;
        }
        .feedback-card .btn-submit:hover {
            background: #d97706;
            transform: translateY(-2px);
        }
        .star-rating {
            display: flex;
            gap: 0.3rem;
            font-size: 1.8rem;
            color: #d1d9e6;
            cursor: pointer;
            direction: rtl;
        }
        .star-rating i {
            transition: color 0.15s, transform 0.15s;
        }
        .star-rating i:hover,
        .star-rating i:hover~i {
            color: #f59e0b;
            transform: scale(1.1);
        }
        .star-rating input {
            display: none;
        }
        .star-rating label {
            cursor: pointer;
            color: #d1d9e6;
            transition: color 0.15s;
        }
        .star-rating label:hover,
        .star-rating label:hover~label,
        .star-rating input:checked~label {
            color: #f59e0b;
        }
        .site-footer {
            background: #0f172a;
            color: #cbd5e1;
            padding: 2.5rem 0 1.5rem;
            margin-top: 3rem;
            border-top: 4px solid #f59e0b;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr;
            gap: 2rem;
            margin-bottom: 2rem;
        }
        @media(max-width:768px) {
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 1.5rem;
            }
        }
        .footer-brand h4 {
            color: #f59e0b;
            font-size: 1.4rem;
            margin-bottom: 0.5rem;
        }
        .footer-brand p {
            font-size: 0.92rem;
            max-width: 360px;
        }
        .footer-links h5 {
            color: #fff;
            font-size: 1.05rem;
            margin-bottom: 0.8rem;
            border-bottom: 2px solid #334155;
            padding-bottom: 0.4rem;
        }
        .footer-links ul {
            list-style: none;
            padding: 0;
        }
        .footer-links li {
            margin-bottom: 0.4rem;
        }
        .footer-links a {
            color: #94a3b8;
            font-size: 0.9rem;
            transition: color 0.2s;
        }
        .footer-links a:hover {
            color: #f59e0b;
            text-decoration: none;
        }
        .footer-bottom {
            border-top: 1px solid #1e293b;
            padding-top: 1.5rem;
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            align-items: center;
            font-size: 0.85rem;
        }
        .footer-bottom .copyright {
            color: #64748b;
        }
        friend-link {
            display: block;
            margin-top: 0.8rem;
            font-size: 0.9rem;
        }
        friend-link a {
            color: #94a3b8;
            margin: 0 0.3rem;
        }
        friend-link a:hover {
            color: #f59e0b;
        }
        @media(max-width:768px) {
            .header-inner {
                flex-wrap: wrap;
            }
            .my-logo {
                font-size: 1.4rem;
            }
            .nav-wrapper .main-nav {
                display: none;
                flex-direction: column;
                width: 100%;
                background: #1e293b;
                padding: 1rem 0.5rem;
                border-radius: 12px;
                margin-top: 0.8rem;
                gap: 0.2rem;
            }
            .nav-wrapper .main-nav.open {
                display: flex;
            }
            .hamburger {
                display: block;
            }
            .content-area h1 {
                font-size: 1.9rem;
            }
            .content-area h2 {
                font-size: 1.5rem;
            }
            .content-area h3 {
                font-size: 1.2rem;
            }
            .feedback-section {
                padding: 1.5rem 1.2rem;
            }
            .breadcrumb ol {
                font-size: 0.78rem;
            }
            .sidebar {
                position: static;
            }
        }
        @media(min-width:769px) {
            .main-nav {
                display: flex !important;
            }
            .hamburger {
                display: none !important;
            }
        }
        .last-updated {
            display: inline-block;
            background: #e9edf2;
            padding: 0.3rem 1rem;
            border-radius: 40px;
            font-size: 0.85rem;
            color: #475569;
            margin-bottom: 1.2rem;
        }
        .last-updated i {
            margin-right: 0.4rem;
            color: #f59e0b;
        }
        .table-of-contents {
            background: #fff;
            border-radius: 16px;
            padding: 1.5rem 2rem;
            margin: 1.8rem 0;
            box-shadow: 0 4px 16px rgba(0, 0, 0, 0.05);
            border: 1px solid #e2e8f0;
        }
        .table-of-contents ol {
            columns: 2;
            column-gap: 2rem;
        }
        @media(max-width:600px) {
            .table-of-contents ol {
                columns: 1;
            }
        }
        .table-of-contents a {
            color: #1e293b;
            font-weight: 500;
        }
        .table-of-contents a:hover {
            color: #f59e0b;
        }
        .inline-img-wrap {
            float: right;
            margin: 0 0 1.2rem 1.8rem;
            max-width: 320px;
            border-radius: 12px;
            overflow: hidden;
            box-shadow: 0 4px 16px rgba(0, 0, 0, 0.08);
        }
        @media(max-width:600px) {
            .inline-img-wrap {
                float: none;
                margin: 1.5rem 0;
                max-width: 100%;
            }
        }
        .clearfix::after {
            content: "";
            display: table;
            clear: both;
        }
        .btn-top {
            position: fixed;
            bottom: 2rem;
            right: 2rem;
            background: #f59e0b;
            color: #0f172a;
            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(0, 0, 0, 0.2);
            transition: transform 0.2s, opacity 0.3s;
            opacity: 0.9;
            z-index: 999;
            border: none;
            cursor: pointer;
        }
        .btn-top:hover {
            transform: scale(1.08);
            opacity: 1;
        }
        @media(max-width:600px) {
            .btn-top {
                bottom: 1.2rem;
                right: 1.2rem;
                width: 42px;
                height: 42px;
                font-size: 1.2rem;
            }
        }