*,
        *::before,
        *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }
        html {
            scroll-behavior: smooth;
            font-size: 16px;
        }
        body {
            font-family: 'Segoe UI', Roboto, system-ui, -apple-system, sans-serif;
            background: #f8fafc;
            color: #1e293b;
            line-height: 1.7;
            padding: 0 1rem;
            max-width: 1280px;
            margin: 0 auto;
        }
        a {
            color: #0c4a6e;
            text-decoration: none;
            transition: color 0.2s;
        }
        a:hover {
            color: #0369a1;
            text-decoration: underline;
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
            border-radius: 12px;
        }
        ul,
        ol {
            padding-left: 1.5rem;
        }
        li {
            margin-bottom: 0.4rem;
        }
        h1 {
            font-size: 2.4rem;
            font-weight: 800;
            color: #0f172a;
            margin: 1.8rem 0 1rem;
            line-height: 1.2;
            border-left: 6px solid #2563eb;
            padding-left: 1rem;
        }
        h2 {
            font-size: 1.8rem;
            font-weight: 700;
            color: #0f172a;
            margin: 2.4rem 0 0.8rem;
            border-bottom: 3px solid #e2e8f0;
            padding-bottom: 0.4rem;
        }
        h3 {
            font-size: 1.35rem;
            font-weight: 600;
            color: #1e293b;
            margin: 1.8rem 0 0.6rem;
        }
        h4 {
            font-size: 1.1rem;
            font-weight: 600;
            color: #334155;
            margin: 1.2rem 0 0.4rem;
        }
        p {
            margin-bottom: 1rem;
        }
        .lead {
            font-size: 1.15rem;
            color: #475569;
        }
        .site-header {
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            justify-content: space-between;
            padding: 1.2rem 0;
            border-bottom: 2px solid #e2e8f0;
            position: relative;
        }
        .my-logo {
            font-size: 1.9rem;
            font-weight: 900;
            color: #0f172a;
            letter-spacing: -0.5px;
            background: linear-gradient(135deg, #1e40af, #7c3aed);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            display: inline-block;
        }
        .my-logo:hover {
            text-decoration: none;
            opacity: 0.85;
        }
        .my-logo small {
            font-size: 0.7rem;
            font-weight: 400;
            color: #64748b;
            -webkit-text-fill-color: #64748b;
            display: block;
            letter-spacing: 0.3px;
        }
        .nav-bar {
            display: flex;
            align-items: center;
            gap: 1.2rem;
        }
        .nav-links {
            display: flex;
            gap: 1.4rem;
            list-style: none;
            padding: 0;
            margin: 0;
        }
        .nav-links li a {
            font-weight: 600;
            font-size: 0.95rem;
            padding: 0.4rem 0;
            color: #334155;
            position: relative;
        }
        .nav-links li a::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 0;
            height: 2px;
            background: #2563eb;
            transition: width 0.25s;
        }
        .nav-links li a:hover::after {
            width: 100%;
        }
        .nav-links li a:hover {
            text-decoration: none;
            color: #0c4a6e;
        }
        .hamburger {
            display: none;
            background: none;
            border: none;
            font-size: 1.6rem;
            color: #0f172a;
            cursor: pointer;
            padding: 0.2rem 0.6rem;
            border-radius: 6px;
            transition: background 0.2s;
        }
        .hamburger:hover {
            background: #e2e8f0;
        }
        .breadcrumb {
            display: flex;
            flex-wrap: wrap;
            gap: 0.4rem 0.8rem;
            list-style: none;
            padding: 0.8rem 0 0.2rem;
            font-size: 0.9rem;
            color: #64748b;
        }
        .breadcrumb li+li::before {
            content: '›';
            margin-right: 0.6rem;
            color: #94a3b8;
        }
        .breadcrumb a {
            color: #475569;
        }
        .breadcrumb a:hover {
            color: #0c4a6e;
        }
        .breadcrumb .current {
            color: #0f172a;
            font-weight: 600;
        }
        section {
            margin: 2.4rem 0;
        }
        .card {
            background: #ffffff;
            border-radius: 16px;
            padding: 1.8rem 2rem;
            box-shadow: 0 4px 20px rgba(0, 0, 0, 0.04);
            border: 1px solid #eef2f6;
            transition: box-shadow 0.25s;
        }
        .card:hover {
            box-shadow: 0 8px 30px rgba(0, 0, 0, 0.07);
        }
        .grid-2,
        .grid-3 {
            display: grid;
            gap: 1.8rem;
        }
        .grid-2 {
            grid-template-columns: 1fr 1fr;
        }
        .grid-3 {
            grid-template-columns: 1fr 1fr 1fr;
        }
        .flex-center {
            display: flex;
            align-items: center;
            justify-content: center;
        }
        .flex-between {
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            align-items: center;
            gap: 1rem;
        }
        .data-table {
            width: 100%;
            border-collapse: collapse;
            margin: 1.2rem 0;
            font-size: 0.95rem;
        }
        .data-table th {
            background: #1e293b;
            color: #f8fafc;
            padding: 0.7rem 1rem;
            text-align: left;
            font-weight: 600;
        }
        .data-table td {
            padding: 0.6rem 1rem;
            border-bottom: 1px solid #e2e8f0;
        }
        .data-table tr:hover td {
            background: #f1f5f9;
        }
        .form-group {
            margin-bottom: 1.2rem;
        }
        .form-group label {
            display: block;
            font-weight: 600;
            margin-bottom: 0.3rem;
            color: #1e293b;
        }
        .form-group input,
        .form-group textarea,
        .form-group select {
            width: 100%;
            padding: 0.7rem 1rem;
            border: 2px solid #e2e8f0;
            border-radius: 8px;
            font-size: 0.95rem;
            transition: border-color 0.2s;
            background: #fff;
        }
        .form-group input:focus,
        .form-group textarea:focus {
            border-color: #2563eb;
            outline: none;
        }
        .btn {
            display: inline-block;
            padding: 0.7rem 1.8rem;
            border: none;
            border-radius: 8px;
            font-weight: 600;
            font-size: 0.95rem;
            cursor: pointer;
            transition: background 0.2s, transform 0.1s;
            background: #2563eb;
            color: #fff;
        }
        .btn:hover {
            background: #1d4ed8;
            transform: translateY(-1px);
        }
        .btn-secondary {
            background: #475569;
        }
        .btn-secondary:hover {
            background: #334155;
        }
        .star-rating {
            display: flex;
            gap: 0.3rem;
            font-size: 1.7rem;
            color: #cbd5e1;
            cursor: pointer;
            direction: rtl;
        }
        .star-rating input {
            display: none;
        }
        .star-rating label {
            cursor: pointer;
            transition: color 0.15s;
        }
        .star-rating label:hover,
        .star-rating label:hover~label,
        .star-rating input:checked~label {
            color: #f59e0b;
        }
        .img-wrapper {
            margin: 1.6rem 0;
            border-radius: 12px;
            overflow: hidden;
            background: #eef2f6;
        }
        .img-wrapper figcaption {
            padding: 0.6rem 1rem;
            font-size: 0.85rem;
            color: #64748b;
            background: #f8fafc;
            border-top: 1px solid #e2e8f0;
        }
        friend-link {
            display: block;
            padding: 1.2rem 0;
            border-top: 2px solid #e2e8f0;
            margin-top: 2rem;
        }
        friend-link .friend-list {
            display: flex;
            flex-wrap: wrap;
            gap: 0.8rem 2rem;
            list-style: none;
            padding: 0.6rem 0 0;
        }
        friend-link .friend-list li a {
            color: #475569;
            font-weight: 500;
        }
        friend-link .friend-list li a:hover {
            color: #0c4a6e;
        }
        .site-footer {
            padding: 1.8rem 0 2.4rem;
            border-top: 2px solid #e2e8f0;
            margin-top: 2rem;
            text-align: center;
            color: #64748b;
            font-size: 0.9rem;
        }
        .site-footer .copyright {
            margin-top: 0.6rem;
            font-size: 0.85rem;
        }
        @media (max-width: 900px) {
            .grid-2,
            .grid-3 {
                grid-template-columns: 1fr;
            }
        }
        @media (max-width: 768px) {
            body {
                padding: 0 0.8rem;
            }
            h1 {
                font-size: 1.8rem;
            }
            h2 {
                font-size: 1.4rem;
            }
            h3 {
                font-size: 1.15rem;
            }
            .nav-links {
                display: none;
                flex-direction: column;
                width: 100%;
                background: #ffffff;
                padding: 1.2rem 1rem;
                border-radius: 12px;
                box-shadow: 0 12px 30px rgba(0, 0, 0, 0.08);
                border: 1px solid #e2e8f0;
                margin-top: 0.8rem;
                gap: 0.6rem;
            }
            .nav-links.open {
                display: flex;
            }
            .hamburger {
                display: block;
            }
            .nav-bar {
                flex-wrap: wrap;
                justify-content: flex-end;
            }
            .card {
                padding: 1.2rem 1rem;
            }
            .data-table {
                font-size: 0.85rem;
            }
            .data-table th,
            .data-table td {
                padding: 0.4rem 0.6rem;
            }
            .my-logo {
                font-size: 1.5rem;
            }
        }
        @media (max-width: 480px) {
            h1 {
                font-size: 1.5rem;
                padding-left: 0.6rem;
            }
            .breadcrumb {
                font-size: 0.8rem;
            }
            .star-rating {
                font-size: 1.4rem;
            }
        }
        .badge {
            display: inline-block;
            background: #dbeafe;
            color: #1e40af;
            font-size: 0.75rem;
            font-weight: 700;
            padding: 0.2rem 0.8rem;
            border-radius: 20px;
            letter-spacing: 0.3px;
        }
        .highlight {
            background: #fef9c3;
            padding: 0.1rem 0.3rem;
            border-radius: 4px;
            font-weight: 600;
        }
        .emoji-lg {
            font-size: 1.3rem;
        }
        .mt-1 {
            margin-top: 0.6rem;
        }
        .mt-2 {
            margin-top: 1.2rem;
        }
        .mb-1 {
            margin-bottom: 0.6rem;
        }
        .mb-2 {
            margin-bottom: 1.2rem;
        }
        .text-muted {
            color: #64748b;
        }
        .text-center {
            text-align: center;
        }