* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        html {
            scroll-behavior: smooth;
            font-size: 16px;
        }
        body {
            font-family: 'Segoe UI', Roboto, system-ui, -apple-system, sans-serif;
            background: #f9fafb;
            color: #1f2937;
            line-height: 1.8;
            padding: 0 1rem;
            max-width: 1280px;
            margin: 0 auto;
        }
        a {
            color: #1d4ed8;
            text-decoration: none;
            transition: color 0.2s;
        }
        a:hover {
            color: #0f3b8a;
            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: 0.4rem;
        }
        h1 {
            font-size: 2.6rem;
            font-weight: 800;
            line-height: 1.2;
            margin: 1.8rem 0 1rem;
            color: #0b1e33;
            letter-spacing: -0.02em;
        }
        h2 {
            font-size: 2rem;
            font-weight: 700;
            margin: 2.8rem 0 1rem;
            color: #14375c;
            border-bottom: 3px solid #e5e7eb;
            padding-bottom: 0.4rem;
        }
        h3 {
            font-size: 1.5rem;
            font-weight: 600;
            margin: 2rem 0 0.8rem;
            color: #1e4a7a;
        }
        h4 {
            font-size: 1.2rem;
            font-weight: 600;
            margin: 1.5rem 0 0.5rem;
            color: #2563a0;
        }
        p {
            margin: 1rem 0;
            font-size: 1.05rem;
            color: #2d3a4a;
        }
        .text-muted {
            color: #6b7280;
            font-size: 0.95rem;
        }
        header {
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            justify-content: space-between;
            padding: 1.2rem 0;
            border-bottom: 2px solid #e5e7eb;
            position: relative;
            background: #fff;
        }
        .my-logo {
            font-size: 1.9rem;
            font-weight: 800;
            color: #0b1e33;
            letter-spacing: -0.03em;
            text-decoration: none;
            display: flex;
            align-items: center;
            gap: 0.4rem;
        }
        .my-logo:hover {
            color: #1d4ed8;
            text-decoration: none;
        }
        .my-logo i {
            color: #1d4ed8;
            font-size: 2rem;
        }
        .nav-wrapper {
            display: flex;
            align-items: center;
            gap: 1.5rem;
        }
        nav#main-nav {
            display: flex;
            gap: 1.2rem;
            flex-wrap: wrap;
        }
        nav#main-nav a {
            font-weight: 500;
            color: #1f2937;
            padding: 0.3rem 0.6rem;
            border-radius: 6px;
            transition: background 0.2s, color 0.2s;
            font-size: 0.95rem;
        }
        nav#main-nav a:hover {
            background: #e0f2fe;
            color: #0b3b6b;
            text-decoration: none;
        }
        .hamburger {
            display: none;
            background: none;
            border: none;
            font-size: 1.8rem;
            color: #1f2937;
            cursor: pointer;
            padding: 0.2rem 0.6rem;
            border-radius: 6px;
            transition: background 0.2s;
        }
        .hamburger:hover {
            background: #f3f4f6;
        }
        .breadcrumb {
            display: flex;
            flex-wrap: wrap;
            list-style: none;
            padding: 0.8rem 0;
            margin: 0.5rem 0 1rem;
            font-size: 0.9rem;
            color: #6b7280;
            gap: 0.4rem;
        }
        .breadcrumb li+li::before {
            content: "›";
            padding: 0 0.5rem;
            color: #9ca3af;
            font-weight: 700;
        }
        .breadcrumb a {
            color: #1d4ed8;
        }
        .breadcrumb a:hover {
            text-decoration: underline;
        }
        .breadcrumb .active {
            color: #374151;
            font-weight: 500;
        }
        .hero-img {
            margin: 1.5rem 0 2rem;
            border-radius: 16px;
            box-shadow: 0 8px 24px rgba(0, 0, 0, 0.08);
            width: 100%;
            max-height: 480px;
            object-fit: cover;
        }
        .form-card {
            background: #ffffff;
            border: 1px solid #e5e7eb;
            border-radius: 16px;
            padding: 1.8rem 2rem;
            margin: 2rem 0;
            box-shadow: 0 4px 12px rgba(0, 0, 0, 0.04);
        }
        .form-card h3 {
            margin-top: 0;
            display: flex;
            align-items: center;
            gap: 0.6rem;
        }
        .form-group {
            margin-bottom: 1.2rem;
        }
        .form-group label {
            display: block;
            font-weight: 600;
            margin-bottom: 0.3rem;
            color: #1f2937;
        }
        .form-group input,
        .form-group textarea,
        .form-group select {
            width: 100%;
            padding: 0.75rem 1rem;
            border: 1px solid #d1d5db;
            border-radius: 10px;
            font-size: 1rem;
            font-family: inherit;
            transition: border 0.2s, box-shadow 0.2s;
            background: #fafafa;
        }
        .form-group input:focus,
        .form-group textarea:focus,
        .form-group select:focus {
            outline: none;
            border-color: #1d4ed8;
            box-shadow: 0 0 0 3px rgba(29, 78, 216, 0.12);
            background: #fff;
        }
        .form-group textarea {
            resize: vertical;
            min-height: 100px;
        }
        .btn {
            display: inline-flex;
            align-items: center;
            gap: 0.5rem;
            padding: 0.7rem 1.6rem;
            background: #1d4ed8;
            color: #fff;
            border: none;
            border-radius: 10px;
            font-size: 1rem;
            font-weight: 600;
            cursor: pointer;
            transition: background 0.2s, transform 0.1s;
        }
        .btn:hover {
            background: #1e40af;
            transform: scale(0.98);
        }
        .btn-outline {
            background: transparent;
            color: #1d4ed8;
            border: 2px solid #1d4ed8;
        }
        .btn-outline:hover {
            background: #e0f2fe;
            color: #0b3b6b;
        }
        .star-rating {
            display: flex;
            flex-direction: row-reverse;
            justify-content: flex-end;
            gap: 0.2rem;
            font-size: 1.8rem;
        }
        .star-rating input {
            display: none;
        }
        .star-rating label {
            cursor: pointer;
            color: #d1d5db;
            transition: color 0.15s;
        }
        .star-rating label:hover,
        .star-rating label:hover~label,
        .star-rating input:checked~label {
            color: #f59e0b;
        }
        .comment-item {
            border-bottom: 1px solid #e5e7eb;
            padding: 1.2rem 0;
        }
        .comment-item:last-child {
            border-bottom: none;
        }
        .comment-author {
            font-weight: 700;
            color: #0b1e33;
        }
        .comment-date {
            font-size: 0.85rem;
            color: #9ca3af;
            margin-left: 0.8rem;
        }
        .comment-body {
            margin-top: 0.3rem;
            color: #374151;
        }
        friend-link {
            display: block;
            padding: 1.8rem 0;
            border-top: 2px solid #e5e7eb;
            margin-top: 2rem;
        }
        friend-link ul {
            display: flex;
            flex-wrap: wrap;
            gap: 1.2rem 2rem;
            list-style: none;
            padding: 0;
            margin: 0.8rem 0 0;
        }
        friend-link ul li a {
            color: #1d4ed8;
            font-weight: 500;
        }
        friend-link ul li a:hover {
            text-decoration: underline;
        }
        footer {
            padding: 1.8rem 0 2.5rem;
            border-top: 2px solid #e5e7eb;
            margin-top: 1rem;
            text-align: center;
            color: #6b7280;
            font-size: 0.95rem;
        }
        footer .copyright {
            margin-top: 0.6rem;
            font-weight: 400;
        }
        .toc {
            background: #f0f4f9;
            border-radius: 14px;
            padding: 1.6rem 2rem;
            margin: 2rem 0;
            border-left: 5px solid #1d4ed8;
        }
        .toc h3 {
            margin-top: 0;
            color: #0b1e33;
        }
        .toc ul {
            list-style: none;
            padding: 0;
            margin: 0.6rem 0 0;
        }
        .toc ul li {
            padding: 0.2rem 0;
        }
        .toc ul li a {
            font-weight: 500;
        }
        .grid-2 {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 2rem;
            margin: 2rem 0;
        }
        .grid-3 {
            display: grid;
            grid-template-columns: 1fr 1fr 1fr;
            gap: 1.5rem;
            margin: 2rem 0;
        }
        .card {
            background: #fff;
            border-radius: 14px;
            padding: 1.5rem;
            border: 1px solid #e5e7eb;
            transition: box-shadow 0.25s, transform 0.2s;
        }
        .card:hover {
            box-shadow: 0 12px 28px rgba(0, 0, 0, 0.06);
            transform: translateY(-3px);
        }
        .card i {
            font-size: 2rem;
            color: #1d4ed8;
            margin-bottom: 0.6rem;
        }
        .highlight-box {
            background: #eef2ff;
            border-radius: 14px;
            padding: 1.6rem 2rem;
            margin: 2rem 0;
            border: 1px solid #c7d2fe;
        }
        .highlight-box strong {
            color: #1d4ed8;
        }
        @media (max-width: 900px) {
            .grid-2 {
                grid-template-columns: 1fr;
            }
            .grid-3 {
                grid-template-columns: 1fr 1fr;
            }
            h1 {
                font-size: 2rem;
            }
            h2 {
                font-size: 1.6rem;
            }
            h3 {
                font-size: 1.3rem;
            }
            body {
                padding: 0 0.8rem;
            }
            .form-card {
                padding: 1.2rem;
            }
        }
        @media (max-width: 640px) {
            .nav-wrapper nav#main-nav {
                display: none;
                flex-direction: column;
                width: 100%;
                background: #fff;
                padding: 1rem 0;
                border-top: 1px solid #e5e7eb;
                margin-top: 0.6rem;
                gap: 0.4rem;
            }
            .nav-wrapper nav#main-nav.open {
                display: flex;
            }
            .hamburger {
                display: block;
            }
            .grid-3 {
                grid-template-columns: 1fr;
            }
            h1 {
                font-size: 1.7rem;
            }
            .toc {
                padding: 1rem;
            }
            .star-rating {
                font-size: 1.5rem;
            }
            .my-logo {
                font-size: 1.5rem;
            }
        }
        .mt-2 {
            margin-top: 2rem;
        }
        .mb-2 {
            margin-bottom: 2rem;
        }
        .flex {
            display: flex;
            align-items: center;
            gap: 0.6rem;
        }
        .gap-1 {
            gap: 1rem;
        }
        .text-center {
            text-align: center;
        }
        .badge {
            background: #dbeafe;
            color: #1d4ed8;
            padding: 0.2rem 1rem;
            border-radius: 20px;
            font-size: 0.85rem;
            font-weight: 600;
        }
        .last-updated {
            display: flex;
            align-items: center;
            gap: 0.5rem;
            color: #6b7280;
            font-size: 0.95rem;
            padding: 0.6rem 0;
            border-bottom: 1px dashed #d1d5db;
            margin-bottom: 1.2rem;
        }
        blockquote {
            border-left: 4px solid #1d4ed8;
            padding: 0.8rem 1.5rem;
            margin: 1.5rem 0;
            background: #f8fafc;
            border-radius: 0 12px 12px 0;
            font-style: italic;
            color: #374151;
        }