*,
        *::before,
        *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }
        html {
            scroll-behavior: smooth;
            font-size: 16px;
        }
        body {
            font-family: system-ui, -apple-system, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
            background: #f7f9fc;
            color: #1e293b;
            line-height: 1.7;
            padding: 0;
            margin: 0;
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        a {
            color: #2563eb;
            text-decoration: none;
            transition: color 0.2s;
        }
        a:hover {
            color: #1d4ed8;
            text-decoration: underline;
        }
        ul,
        ol {
            padding-left: 1.5rem;
        }
        .container {
            max-width: 1120px;
            margin: 0 auto;
            padding: 0 1.25rem;
        }
        .site-header {
            background: linear-gradient(135deg, #0b1121 0%, #1a2639 100%);
            padding: 1rem 0;
            position: sticky;
            top: 0;
            z-index: 100;
            box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
        }
        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            flex-wrap: wrap;
        }
        .my-logo {
            font-size: 1.6rem;
            font-weight: 800;
            color: #f8fafc;
            letter-spacing: -0.02em;
            background: linear-gradient(to right, #a78bfa, #60a5fa);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            transition: opacity 0.2s;
        }
        .my-logo:hover {
            opacity: 0.85;
            text-decoration: none;
        }
        .nav-toggle {
            display: none;
            font-size: 1.5rem;
            color: #f1f5f9;
            background: none;
            border: none;
            cursor: pointer;
            padding: 0.25rem 0.5rem;
        }
        .nav-menu {
            display: flex;
            align-items: center;
            gap: 1.75rem;
            list-style: none;
            padding: 0;
            margin: 0;
        }
        .nav-menu a {
            color: #e2e8f0;
            font-weight: 500;
            font-size: 0.95rem;
            padding: 0.4rem 0;
            border-bottom: 2px solid transparent;
            transition: border-color 0.2s, color 0.2s;
        }
        .nav-menu a:hover {
            color: #a78bfa;
            border-bottom-color: #a78bfa;
            text-decoration: none;
        }
        .breadcrumb-wrap {
            background: #eef2f7;
            padding: 0.65rem 0;
            border-bottom: 1px solid #dce3ed;
        }
        .breadcrumb {
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            gap: 0.4rem;
            font-size: 0.85rem;
            color: #475569;
        }
        .breadcrumb a {
            color: #3b82f6;
        }
        .breadcrumb span.sep {
            color: #94a3b8;
            margin: 0 0.15rem;
        }
        .hero {
            background: linear-gradient(145deg, #0f172a, #1e293b);
            color: #f1f5f9;
            padding: 3rem 0 3.5rem;
            margin-bottom: 2.5rem;
            border-radius: 0 0 2rem 2rem;
        }
        .hero h1 {
            font-size: 2.4rem;
            font-weight: 800;
            line-height: 1.2;
            margin-bottom: 1rem;
        }
        .hero h1 span {
            background: linear-gradient(to right, #c084fc, #818cf8);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }
        .hero p {
            font-size: 1.1rem;
            max-width: 720px;
            color: #cbd5e1;
            margin-bottom: 1.2rem;
        }
        .hero-meta {
            display: flex;
            flex-wrap: wrap;
            gap: 1.5rem;
            font-size: 0.9rem;
            color: #94a3b8;
        }
        .hero-meta i {
            margin-right: 0.4rem;
        }
        .main-grid {
            display: grid;
            grid-template-columns: 1fr 320px;
            gap: 2.5rem;
            padding: 1.5rem 0 3rem;
        }
        .content h2 {
            font-size: 1.85rem;
            font-weight: 700;
            margin: 2.2rem 0 1rem;
            padding-bottom: 0.4rem;
            border-bottom: 3px solid #e2e8f0;
            color: #0f172a;
        }
        .content h3 {
            font-size: 1.35rem;
            font-weight: 600;
            margin: 1.8rem 0 0.75rem;
            color: #1e293b;
        }
        .content h4 {
            font-size: 1.1rem;
            font-weight: 600;
            margin: 1.2rem 0 0.5rem;
            color: #334155;
        }
        .content p {
            margin-bottom: 1.1rem;
            color: #334155;
        }
        .content ul,
        .content ol {
            margin-bottom: 1.2rem;
            color: #334155;
        }
        .content li {
            margin-bottom: 0.3rem;
        }
        .content strong {
            color: #0f172a;
        }
        .content .insight-box {
            background: #eef2ff;
            border-left: 4px solid #6366f1;
            padding: 1.2rem 1.5rem;
            border-radius: 0 12px 12px 0;
            margin: 1.5rem 0;
        }
        .content .insight-box p {
            margin-bottom: 0.3rem;
        }
        .content img {
            border-radius: 16px;
            margin: 1.8rem auto;
            box-shadow: 0 8px 30px rgba(0, 0, 0, 0.12);
            max-width: 100%;
            width: 100%;
            object-fit: cover;
        }
        .content .img-caption {
            text-align: center;
            font-size: 0.85rem;
            color: #64748b;
            margin-top: -1rem;
            margin-bottom: 1.8rem;
        }
        .sidebar {
            position: sticky;
            top: 90px;
            align-self: start;
        }
        .sidebar-card {
            background: #ffffff;
            border-radius: 16px;
            padding: 1.5rem;
            box-shadow: 0 4px 20px rgba(0, 0, 0, 0.06);
            margin-bottom: 1.8rem;
            border: 1px solid #e9edf4;
        }
        .sidebar-card h3 {
            font-size: 1.1rem;
            font-weight: 700;
            margin-bottom: 0.8rem;
            color: #0f172a;
        }
        .sidebar-card ul {
            list-style: none;
            padding: 0;
            margin: 0;
        }
        .sidebar-card li {
            padding: 0.45rem 0;
            border-bottom: 1px solid #f1f5f9;
        }
        .sidebar-card li:last-child {
            border-bottom: none;
        }
        .sidebar-card a {
            color: #2563eb;
            font-weight: 500;
            font-size: 0.9rem;
        }
        .sidebar-card a:hover {
            color: #1d4ed8;
        }
        .search-form {
            display: flex;
            border: 1px solid #d1d9e6;
            border-radius: 40px;
            overflow: hidden;
            background: #fff;
            transition: box-shadow 0.2s;
        }
        .search-form:focus-within {
            box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.2);
            border-color: #818cf8;
        }
        .search-form input {
            flex: 1;
            border: none;
            padding: 0.7rem 1.2rem;
            font-size: 0.95rem;
            outline: none;
            background: transparent;
        }
        .search-form button {
            background: transparent;
            border: none;
            padding: 0 1.2rem;
            color: #6366f1;
            font-size: 1.1rem;
            cursor: pointer;
            transition: color 0.2s;
        }
        .search-form button:hover {
            color: #4f46e5;
        }
        .rating-stars {
            display: flex;
            gap: 0.3rem;
            font-size: 1.6rem;
            color: #d1d5db;
            cursor: pointer;
            direction: rtl;
            justify-content: flex-end;
        }
        .rating-stars input {
            display: none;
        }
        .rating-stars label {
            transition: color 0.15s;
            cursor: pointer;
            color: #d1d5db;
        }
        .rating-stars label:hover,
        .rating-stars label:hover~label,
        .rating-stars input:checked~label {
            color: #f59e0b;
        }
        .rating-form {
            display: flex;
            flex-direction: column;
            gap: 0.8rem;
        }
        .rating-form button {
            align-self: flex-end;
            background: #6366f1;
            color: #fff;
            border: none;
            padding: 0.45rem 1.4rem;
            border-radius: 40px;
            font-weight: 600;
            font-size: 0.85rem;
            cursor: pointer;
            transition: background 0.2s;
        }
        .rating-form button:hover {
            background: #4f46e5;
        }
        .comment-form textarea {
            width: 100%;
            border: 1px solid #d1d9e6;
            border-radius: 12px;
            padding: 0.8rem 1rem;
            font-size: 0.95rem;
            resize: vertical;
            font-family: inherit;
            transition: border-color 0.2s;
        }
        .comment-form textarea:focus {
            outline: none;
            border-color: #818cf8;
            box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
        }
        .comment-form .comment-row {
            display: flex;
            gap: 0.8rem;
            margin-top: 0.6rem;
            flex-wrap: wrap;
        }
        .comment-form input {
            flex: 1;
            min-width: 140px;
            border: 1px solid #d1d9e6;
            border-radius: 40px;
            padding: 0.6rem 1rem;
            font-size: 0.9rem;
            outline: none;
        }
        .comment-form input:focus {
            border-color: #818cf8;
            box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
        }
        .comment-form button {
            background: #6366f1;
            color: #fff;
            border: none;
            padding: 0.6rem 1.6rem;
            border-radius: 40px;
            font-weight: 600;
            font-size: 0.9rem;
            cursor: pointer;
            transition: background 0.2s;
        }
        .comment-form button:hover {
            background: #4f46e5;
        }
        friend-link {
            display: block;
            padding: 1.5rem 0;
            border-top: 1px solid #e2e8f0;
            margin-top: 2rem;
        }
        friend-link .fl-title {
            font-weight: 700;
            font-size: 1rem;
            color: #0f172a;
            margin-bottom: 0.6rem;
        }
        friend-link a {
            color: #2563eb;
            font-weight: 500;
            margin-right: 1.5rem;
        }
        .site-footer {
            background: #0b1121;
            color: #cbd5e1;
            padding: 2.5rem 0 1.5rem;
            margin-top: 3rem;
        }
        .site-footer .footer-inner {
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            gap: 1.5rem;
        }
        .site-footer .copy {
            font-size: 0.85rem;
            color: #94a3b8;
        }
        .site-footer a {
            color: #a78bfa;
        }
        @media (max-width: 900px) {
            .main-grid {
                grid-template-columns: 1fr;
            }
            .sidebar {
                position: static;
            }
            .hero h1 {
                font-size: 1.8rem;
            }
        }
        @media (max-width: 768px) {
            .nav-toggle {
                display: block;
            }
            .nav-menu {
                display: none;
                flex-direction: column;
                width: 100%;
                gap: 0.5rem;
                padding: 1rem 0 0.5rem;
                border-top: 1px solid #2a3a5e;
                margin-top: 0.75rem;
            }
            .nav-menu.open {
                display: flex;
            }
            .nav-menu a {
                padding: 0.5rem 0;
            }
            .header-inner {
                align-items: center;
            }
            .hero h1 {
                font-size: 1.5rem;
            }
            .hero p {
                font-size: 0.95rem;
            }
            .content h2 {
                font-size: 1.5rem;
            }
            .content h3 {
                font-size: 1.15rem;
            }
            .breadcrumb {
                font-size: 0.78rem;
            }
            .my-logo {
                font-size: 1.3rem;
            }
        }
        @media (max-width: 480px) {
            .container {
                padding: 0 0.9rem;
            }
            .hero {
                padding: 2rem 0 2.5rem;
            }
            .hero h1 {
                font-size: 1.3rem;
            }
            .rating-stars {
                font-size: 1.4rem;
            }
            .comment-form .comment-row {
                flex-direction: column;
            }
        }
        .scroll-top {
            position: fixed;
            bottom: 2rem;
            right: 2rem;
            background: #6366f1;
            color: #fff;
            width: 44px;
            height: 44px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.2rem;
            box-shadow: 0 4px 16px rgba(99, 102, 241, 0.35);
            transition: transform 0.2s, background 0.2s;
            z-index: 50;
            border: none;
            cursor: pointer;
        }
        .scroll-top:hover {
            background: #4f46e5;
            transform: scale(1.05);
        }
        .toc-list {
            list-style: none;
            padding: 0;
        }
        .toc-list li {
            padding: 0.3rem 0;
        }
        .toc-list a {
            font-size: 0.88rem;
            color: #334155;
            border-bottom: 1px dotted #d1d9e6;
            display: block;
            padding: 0.2rem 0;
        }
        .toc-list a:hover {
            color: #6366f1;
            border-bottom-color: #6366f1;
            text-decoration: none;
        }
        .mb-0 {
            margin-bottom: 0;
        }
        .mt-1 {
            margin-top: 0.5rem;
        }
        .flex-center {
            display: flex;
            align-items: center;
            gap: 0.5rem;
        }
        .gap-1 {
            gap: 0.75rem;
        }
        .text-sm {
            font-size: 0.85rem;
        }
        .text-muted {
            color: #64748b;
        }