*,
        *::before,
        *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }
        html {
            scroll-behavior: smooth;
            font-size: 16px;
        }
        body {
            font-family: 'Segoe UI', 'Helvetica Neue', Arial, sans-serif;
            background: #f8f9fa;
            color: #1e2a3a;
            line-height: 1.7;
            padding: 0 1rem;
        }
        a {
            text-decoration: none;
            color: #0056b3;
            transition: color 0.2s;
        }
        a:hover {
            color: #ff6b35;
            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;
        }
        .container {
            max-width: 1220px;
            margin: 0 auto;
            padding: 1.5rem 1rem;
            background: #ffffff;
            box-shadow: 0 0 40px rgba(0, 0, 0, 0.04);
            border-radius: 24px;
        }
        .site-header {
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            justify-content: space-between;
            padding: 1rem 0 1.5rem 0;
            border-bottom: 2px solid #eaeef2;
            position: relative;
        }
        .my-logo {
            font-size: 2rem;
            font-weight: 800;
            letter-spacing: -0.5px;
            background: linear-gradient(145deg, #1e2a3a, #3a4a6a);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }
        .my-logo small {
            font-size: 0.9rem;
            font-weight: 400;
            -webkit-text-fill-color: #6c7a8e;
            letter-spacing: 0.3px;
        }
        .nav-bar {
            display: flex;
            align-items: center;
            gap: 0.4rem;
            flex-wrap: wrap;
        }
        .nav-bar a {
            padding: 0.5rem 1rem;
            border-radius: 40px;
            font-weight: 500;
            font-size: 0.95rem;
            color: #1e2a3a;
            transition: background 0.2s, color 0.2s;
        }
        .nav-bar a:hover {
            background: #eef3f9;
            color: #0056b3;
            text-decoration: none;
        }
        .hamburger {
            display: none;
            font-size: 1.8rem;
            background: none;
            border: none;
            cursor: pointer;
            color: #1e2a3a;
            padding: 0.2rem 0.6rem;
            border-radius: 8px;
        }
        .hamburger:hover {
            background: #eef3f9;
        }
        .breadcrumb {
            padding: 0.8rem 0 0.2rem 0;
            font-size: 0.9rem;
            color: #6c7a8e;
            display: flex;
            flex-wrap: wrap;
            gap: 0.3rem 0.6rem;
        }
        .breadcrumb a {
            color: #6c7a8e;
        }
        .breadcrumb a:hover {
            color: #0056b3;
        }
        .breadcrumb span {
            color: #1e2a3a;
            font-weight: 500;
        }
        h1 {
            font-size: 2.8rem;
            font-weight: 800;
            line-height: 1.2;
            margin: 1.8rem 0 1rem 0;
            letter-spacing: -0.5px;
            color: #0b1a2b;
        }
        h2 {
            font-size: 2rem;
            font-weight: 700;
            margin: 2.8rem 0 1rem 0;
            padding-bottom: 0.4rem;
            border-bottom: 3px solid #eaeef2;
            color: #152638;
        }
        h3 {
            font-size: 1.5rem;
            font-weight: 600;
            margin: 2rem 0 0.8rem 0;
            color: #1e3a5a;
        }
        h4 {
            font-size: 1.2rem;
            font-weight: 600;
            margin: 1.4rem 0 0.5rem 0;
            color: #2a405a;
        }
        p {
            margin-bottom: 1.1rem;
            font-size: 1.05rem;
            color: #2c3e4f;
        }
        .lead {
            font-size: 1.25rem;
            font-weight: 400;
            color: #3d556a;
            border-left: 4px solid #ff6b35;
            padding-left: 1.5rem;
            margin: 1.5rem 0 2rem 0;
        }
        .last-updated {
            display: inline-block;
            background: #eef3f9;
            padding: 0.3rem 1.2rem;
            border-radius: 40px;
            font-size: 0.85rem;
            color: #4a5a6e;
            margin-bottom: 1rem;
        }
        .last-updated i {
            margin-right: 0.4rem;
            color: #ff6b35;
        }
        .hero-img {
            margin: 2rem 0 2.5rem 0;
            border-radius: 18px;
            box-shadow: 0 8px 30px rgba(0, 0, 0, 0.08);
        }
        .form-card {
            background: #f2f6fc;
            border-radius: 18px;
            padding: 2rem 2.2rem;
            margin: 2.5rem 0;
            border: 1px solid #e0e8f0;
        }
        .form-card h3 {
            margin-top: 0;
            border-bottom: none;
        }
        .form-group {
            display: flex;
            flex-wrap: wrap;
            gap: 0.8rem;
            margin-top: 1rem;
        }
        .form-group input,
        .form-group textarea,
        .form-group select {
            flex: 1 1 200px;
            padding: 0.8rem 1.2rem;
            border: 1px solid #d0dae6;
            border-radius: 40px;
            font-size: 1rem;
            background: #fff;
            transition: border 0.2s;
        }
        .form-group textarea {
            border-radius: 18px;
            min-height: 100px;
            flex-basis: 100%;
            resize: vertical;
        }
        .form-group input:focus,
        .form-group textarea:focus,
        .form-group select:focus {
            outline: none;
            border-color: #ff6b35;
            box-shadow: 0 0 0 3px rgba(255, 107, 53, 0.15);
        }
        .btn {
            padding: 0.8rem 2.2rem;
            border: none;
            border-radius: 40px;
            font-size: 1rem;
            font-weight: 600;
            background: #1e2a3a;
            color: #fff;
            cursor: pointer;
            transition: background 0.2s, transform 0.1s;
        }
        .btn:hover {
            background: #ff6b35;
            transform: translateY(-2px);
        }
        .btn-secondary {
            background: #e0e8f0;
            color: #1e2a3a;
        }
        .btn-secondary:hover {
            background: #c8d4e2;
            transform: translateY(-2px);
        }
        .rating-stars {
            display: flex;
            gap: 0.3rem;
            font-size: 1.8rem;
            color: #ffb800;
            cursor: pointer;
            margin: 0.5rem 0;
        }
        .rating-stars i {
            transition: transform 0.15s, color 0.15s;
        }
        .rating-stars i:hover {
            transform: scale(1.2);
            color: #ff8c00;
        }
        friend-link {
            display: block;
            padding: 1.8rem 0 0.8rem 0;
            border-top: 2px solid #eaeef2;
            margin-top: 2.5rem;
        }
        friend-link ul {
            list-style: none;
            padding: 0;
            display: flex;
            flex-wrap: wrap;
            gap: 1rem 2rem;
        }
        friend-link li a {
            font-weight: 500;
            color: #3a5a7a;
        }
        friend-link li a:hover {
            color: #ff6b35;
        }
        .site-footer {
            padding: 2rem 0 1.2rem 0;
            text-align: center;
            color: #6c7a8e;
            font-size: 0.9rem;
            border-top: 2px solid #eaeef2;
            margin-top: 2rem;
        }
        .site-footer strong {
            color: #1e2a3a;
        }
        .toc {
            background: #f2f6fc;
            border-radius: 18px;
            padding: 1.8rem 2.2rem;
            margin: 2rem 0 2.5rem 0;
            border: 1px solid #e0e8f0;
        }
        .toc h3 {
            margin-top: 0;
            border-bottom: none;
        }
        .toc ul {
            list-style: none;
            padding: 0;
            columns: 2 220px;
            column-gap: 2rem;
        }
        .toc li {
            margin-bottom: 0.5rem;
            break-inside: avoid;
        }
        .toc li a {
            font-weight: 500;
        }
        .toc li a::before {
            content: "▸ ";
            color: #ff6b35;
        }
        @media (max-width: 768px) {
            body {
                padding: 0 0.6rem;
            }
            .container {
                padding: 1rem 0.8rem;
            }
            h1 {
                font-size: 1.9rem;
            }
            h2 {
                font-size: 1.5rem;
            }
            h3 {
                font-size: 1.25rem;
            }
            .site-header {
                flex-wrap: wrap;
            }
            .nav-bar {
                display: none;
                flex-basis: 100%;
                flex-direction: column;
                align-items: stretch;
                padding-top: 1rem;
                gap: 0.2rem;
            }
            .nav-bar.open {
                display: flex;
            }
            .nav-bar a {
                padding: 0.7rem 1rem;
                border-radius: 12px;
            }
            .hamburger {
                display: block;
            }
            .breadcrumb {
                font-size: 0.8rem;
            }
            .form-card {
                padding: 1.2rem 1rem;
            }
            .form-group input,
            .form-group textarea,
            .form-group select {
                flex-basis: 100%;
            }
            .toc {
                padding: 1.2rem 1rem;
            }
            .toc ul {
                columns: 1;
            }
            .rating-stars {
                font-size: 1.4rem;
            }
            .my-logo {
                font-size: 1.5rem;
            }
        }
        @media (min-width: 769px) and (max-width: 1024px) {
            h1 {
                font-size: 2.3rem;
            }
            .container {
                padding: 1.5rem 2rem;
            }
        }
        .mt-2 {
            margin-top: 2rem;
        }
        .mb-1 {
            margin-bottom: 1rem;
        }
        .highlight-box {
            background: #fef7f2;
            border-left: 4px solid #ff6b35;
            padding: 1.2rem 1.8rem;
            border-radius: 12px;
            margin: 1.8rem 0;
        }
        .grid-2 {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 1.8rem;
            margin: 1.5rem 0;
        }
        @media (max-width: 640px) {
            .grid-2 {
                grid-template-columns: 1fr;
            }
        }
        .emoji-lg {
            font-size: 1.4rem;
            margin-right: 0.3rem;
        }
        .badge {
            display: inline-block;
            background: #ff6b35;
            color: #fff;
            padding: 0.15rem 0.9rem;
            border-radius: 40px;
            font-size: 0.75rem;
            font-weight: 600;
            letter-spacing: 0.3px;
            text-transform: uppercase;
        }