*,
        *::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: #f8f9fa;
            color: #1e293b;
            line-height: 1.7;
            padding: 0 1rem;
        }
        a {
            color: #0a6e5e;
            text-decoration: none;
            transition: color 0.2s ease;
        }
        a:hover {
            color: #064e3b;
            text-decoration: underline;
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
            border-radius: 12px;
        }
        .container {
            max-width: 1200px;
            margin: 0 auto;
            background: #ffffff;
            box-shadow: 0 0 40px rgba(0, 0, 0, 0.04);
            border-radius: 24px;
            padding: 1.5rem 2rem 2rem;
            margin-top: 1.5rem;
            margin-bottom: 2rem;
        }
        @media (max-width: 768px) {
            .container {
                padding: 1rem 1rem 1.5rem;
                border-radius: 16px;
                margin-top: 0.75rem;
            }
            body {
                padding: 0 0.5rem;
            }
        }
        .site-header {
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            justify-content: space-between;
            padding-bottom: 1rem;
            border-bottom: 2px solid #e9edf2;
            margin-bottom: 1rem;
            position: relative;
        }
        .my-logo {
            font-size: 1.8rem;
            font-weight: 800;
            background: linear-gradient(135deg, #0f766e, #0a5c4a);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            letter-spacing: -0.02em;
            line-height: 1.2;
            display: inline-block;
        }
        .my-logo small {
            font-size: 0.75rem;
            font-weight: 400;
            display: block;
            -webkit-text-fill-color: #64748b;
            color: #64748b;
            letter-spacing: 0.02em;
        }
        .my-logo:hover {
            opacity: 0.85;
            text-decoration: none;
        }
        .nav-wrapper {
            display: flex;
            align-items: center;
            gap: 1.5rem;
        }
        .nav-list {
            list-style: none;
            display: flex;
            gap: 1.25rem;
            flex-wrap: wrap;
        }
        .nav-list li a {
            font-weight: 500;
            font-size: 0.95rem;
            padding: 0.4rem 0.2rem;
            border-bottom: 2px solid transparent;
            transition: border-color 0.2s, color 0.2s;
        }
        .nav-list li a:hover {
            border-bottom-color: #0f766e;
            color: #0f766e;
            text-decoration: none;
        }
        .hamburger {
            display: none;
            font-size: 1.8rem;
            background: none;
            border: none;
            cursor: pointer;
            color: #1e293b;
            padding: 0.25rem;
            transition: color 0.2s;
        }
        .hamburger:hover {
            color: #0f766e;
        }
        @media (max-width: 768px) {
            .hamburger {
                display: block;
            }
            .nav-list {
                display: none;
                flex-direction: column;
                width: 100%;
                background: #ffffff;
                border-radius: 16px;
                box-shadow: 0 12px 30px rgba(0, 0, 0, 0.08);
                padding: 1rem 1.25rem;
                gap: 0.6rem;
                position: absolute;
                top: 100%;
                left: 0;
                right: 0;
                z-index: 100;
                border: 1px solid #e9edf2;
                margin-top: 0.5rem;
            }
            .nav-list.active {
                display: flex;
            }
            .nav-wrapper {
                gap: 0.5rem;
            }
            .site-header {
                flex-wrap: wrap;
            }
        }
        .breadcrumb {
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            gap: 0.4rem 0.6rem;
            font-size: 0.85rem;
            color: #64748b;
            margin-bottom: 1.5rem;
            padding: 0.6rem 0;
            border-bottom: 1px solid #f1f3f6;
        }
        .breadcrumb a {
            color: #0a6e5e;
        }
        .breadcrumb span {
            color: #94a3b8;
        }
        h1 {
            font-size: 2.4rem;
            font-weight: 800;
            line-height: 1.25;
            margin-bottom: 0.75rem;
            color: #0c1e2e;
            letter-spacing: -0.02em;
        }
        h2 {
            font-size: 1.8rem;
            font-weight: 700;
            margin-top: 2.5rem;
            margin-bottom: 1rem;
            color: #0f2937;
            border-left: 5px solid #0f766e;
            padding-left: 1rem;
        }
        h3 {
            font-size: 1.35rem;
            font-weight: 600;
            margin-top: 2rem;
            margin-bottom: 0.75rem;
            color: #164555;
        }
        h4 {
            font-size: 1.1rem;
            font-weight: 600;
            margin-top: 1.5rem;
            margin-bottom: 0.5rem;
            color: #1e4a5f;
        }
        @media (max-width: 768px) {
            h1 {
                font-size: 1.7rem;
            }
            h2 {
                font-size: 1.4rem;
            }
            h3 {
                font-size: 1.15rem;
            }
        }
        p {
            margin-bottom: 1.1rem;
        }
        .content-section {
            margin-bottom: 2rem;
        }
        .highlight {
            background: #f0fdfa;
            padding: 0.1rem 0.4rem;
            border-radius: 6px;
            font-weight: 600;
            color: #0f766e;
        }
        .emoji-big {
            font-size: 1.4rem;
            margin-right: 0.25rem;
        }
        .stat-card {
            background: #f8fafc;
            border-radius: 16px;
            padding: 1.25rem 1.5rem;
            border: 1px solid #e9edf2;
            margin: 1.25rem 0;
            transition: box-shadow 0.2s;
        }
        .stat-card:hover {
            box-shadow: 0 4px 16px rgba(0, 0, 0, 0.04);
        }
        .stat-card i {
            color: #0f766e;
            margin-right: 0.5rem;
        }
        .grid-2 {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 1.5rem;
            margin: 1.5rem 0;
        }
        .grid-3 {
            display: grid;
            grid-template-columns: 1fr 1fr 1fr;
            gap: 1.5rem;
            margin: 1.5rem 0;
        }
        @media (max-width: 768px) {
            .grid-2,
            .grid-3 {
                grid-template-columns: 1fr;
            }
        }
        .featured-image {
            margin: 2rem 0;
            border-radius: 16px;
            overflow: hidden;
            background: #f1f5f9;
        }
        .featured-image img {
            width: 100%;
            object-fit: cover;
            max-height: 480px;
        }
        .featured-image figcaption {
            padding: 0.75rem 1rem;
            font-size: 0.85rem;
            color: #64748b;
            background: #f8fafc;
            border-top: 1px solid #e9edf2;
        }
        .search-box {
            display: flex;
            gap: 0.5rem;
            max-width: 500px;
            margin: 1.5rem 0;
            flex-wrap: wrap;
        }
        .search-box input {
            flex: 1;
            padding: 0.7rem 1.2rem;
            border: 2px solid #e2e8f0;
            border-radius: 40px;
            font-size: 1rem;
            outline: none;
            transition: border-color 0.2s;
            min-width: 160px;
        }
        .search-box input:focus {
            border-color: #0f766e;
        }
        .search-box button {
            padding: 0.7rem 1.6rem;
            background: #0f766e;
            color: #fff;
            border: none;
            border-radius: 40px;
            font-weight: 600;
            cursor: pointer;
            transition: background 0.2s, transform 0.1s;
            font-size: 0.95rem;
        }
        .search-box button:hover {
            background: #0a5c4a;
            transform: scale(1.02);
        }
        .search-box button i {
            margin-right: 0.35rem;
        }
        .feedback-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 2rem;
            margin: 2.5rem 0;
        }
        @media (max-width: 768px) {
            .feedback-grid {
                grid-template-columns: 1fr;
                gap: 1.5rem;
            }
        }
        .feedback-card {
            background: #f9fbfd;
            border-radius: 20px;
            padding: 1.5rem 1.75rem;
            border: 1px solid #e9edf2;
            transition: box-shadow 0.25s;
        }
        .feedback-card:hover {
            box-shadow: 0 8px 28px rgba(0, 0, 0, 0.04);
        }
        .feedback-card h3 {
            margin-top: 0;
            border-left: none;
            padding-left: 0;
            font-size: 1.25rem;
        }
        .feedback-card input,
        .feedback-card textarea,
        .feedback-card select {
            width: 100%;
            padding: 0.7rem 1rem;
            border: 2px solid #e2e8f0;
            border-radius: 12px;
            font-size: 0.95rem;
            font-family: inherit;
            margin-bottom: 0.75rem;
            transition: border-color 0.2s;
            background: #fff;
        }
        .feedback-card input:focus,
        .feedback-card textarea:focus,
        .feedback-card select:focus {
            border-color: #0f766e;
            outline: none;
        }
        .feedback-card textarea {
            min-height: 90px;
            resize: vertical;
        }
        .feedback-card button {
            background: #0f766e;
            color: #fff;
            border: none;
            padding: 0.7rem 1.8rem;
            border-radius: 40px;
            font-weight: 600;
            font-size: 0.95rem;
            cursor: pointer;
            transition: background 0.2s, transform 0.1s;
        }
        .feedback-card button:hover {
            background: #0a5c4a;
            transform: scale(1.02);
        }
        .star-rating {
            display: flex;
            gap: 0.3rem;
            font-size: 1.6rem;
            color: #d1d5db;
            cursor: pointer;
            margin-bottom: 0.75rem;
        }
        .star-rating i {
            transition: color 0.15s, transform 0.1s;
        }
        .star-rating i.active,
        .star-rating i:hover {
            color: #f59e0b;
        }
        .star-rating i:hover {
            transform: scale(1.12);
        }
        .related-links {
            background: #f1f7fc;
            border-radius: 20px;
            padding: 1.5rem 2rem;
            margin: 2rem 0;
        }
        .related-links ul {
            list-style: none;
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 0.6rem 1.5rem;
        }
        .related-links li a {
            display: inline-flex;
            align-items: center;
            gap: 0.4rem;
            font-weight: 500;
            padding: 0.25rem 0;
        }
        .related-links li a i {
            font-size: 0.75rem;
            color: #0f766e;
        }
        @media (max-width: 768px) {
            .related-links ul {
                grid-template-columns: 1fr;
            }
            .related-links {
                padding: 1.2rem 1.2rem;
            }
        }
        .site-footer {
            margin-top: 3rem;
            padding-top: 1.5rem;
            border-top: 2px solid #e9edf2;
            font-size: 0.9rem;
            color: #475569;
        }
        .site-footer friend-link {
            display: block;
            margin-bottom: 0.75rem;
            font-weight: 500;
        }
        .site-footer friend-link a {
            margin: 0 0.25rem;
        }
        .footer-bottom {
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            align-items: center;
            padding-top: 0.75rem;
            gap: 0.5rem;
        }
        @media (max-width: 768px) {
            .footer-bottom {
                flex-direction: column;
                text-align: center;
            }
        }
        .last-updated {
            display: inline-flex;
            align-items: center;
            gap: 0.4rem;
            font-size: 0.85rem;
            color: #64748b;
            background: #f1f5f9;
            padding: 0.3rem 1rem;
            border-radius: 40px;
            margin-bottom: 1rem;
        }
        .toc {
            background: #f8fafc;
            border-radius: 16px;
            padding: 1.25rem 1.75rem;
            border: 1px solid #e9edf2;
            margin: 1.5rem 0;
        }
        .toc ul {
            list-style: none;
            columns: 2;
            column-gap: 2rem;
        }
        .toc li a {
            display: block;
            padding: 0.2rem 0;
            font-weight: 500;
        }
        @media (max-width: 768px) {
            .toc ul {
                columns: 1;
            }
        }
        .btn-top {
            position: fixed;
            bottom: 2rem;
            right: 2rem;
            background: #0f766e;
            color: #fff;
            width: 48px;
            height: 48px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.3rem;
            box-shadow: 0 4px 16px rgba(15, 118, 110, 0.25);
            transition: background 0.2s, transform 0.2s;
            z-index: 99;
            border: none;
            cursor: pointer;
        }
        .btn-top:hover {
            background: #0a5c4a;
            transform: translateY(-3px);
        }
        @media (max-width: 768px) {
            .btn-top {
                bottom: 1.25rem;
                right: 1.25rem;
                width: 42px;
                height: 42px;
                font-size: 1.1rem;
            }
        }
        blockquote {
            border-left: 4px solid #0f766e;
            padding: 0.75rem 1.25rem;
            margin: 1.25rem 0;
            background: #f9fdfb;
            border-radius: 0 12px 12px 0;
            font-style: italic;
            color: #1e3a4a;
        }
        .pro-tip {
            background: #fefce8;
            border-left: 4px solid #eab308;
            padding: 0.75rem 1.25rem;
            border-radius: 0 12px 12px 0;
            margin: 1rem 0;
        }
        .pro-tip i {
            color: #eab308;
            margin-right: 0.4rem;
        }