*,
        *::before,
        *::after {
            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: #f6f8fc;
            color: #1a1f2e;
            line-height: 1.7;
            padding: 0 1rem;
        }
        a {
            color: #c0392b;
            text-decoration: none;
            transition: color 0.2s;
        }
        a:hover,
        a:focus-visible {
            color: #e74c3c;
            text-decoration: underline;
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
            border-radius: 12px;
        }
        ul,
        ol {
            padding-left: 1.8rem;
        }
        li {
            margin-bottom: 0.4rem;
        }
        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 1rem;
        }
        .site-header {
            padding: 1.2rem 0 0.8rem;
            border-bottom: 2px solid #e0e5ee;
            margin-bottom: 1.2rem;
        }
        .header-row {
            display: flex;
            align-items: center;
            justify-content: space-between;
            flex-wrap: wrap;
            gap: 0.8rem 1.5rem;
        }
        .my-logo {
            font-size: 2rem;
            font-weight: 800;
            letter-spacing: -0.03em;
            color: #1a1f2e;
            background: linear-gradient(145deg, #c0392b, #e74c3c);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            display: inline-flex;
            align-items: center;
            gap: 0.3rem;
        }
        .my-logo i {
            -webkit-text-fill-color: #c0392b;
            font-size: 2.2rem;
        }
        .my-logo:hover {
            opacity: 0.85;
            text-decoration: none;
        }
        .nav-wrapper {
            display: flex;
            align-items: center;
            gap: 0.5rem 1.2rem;
            flex-wrap: wrap;
        }
        .nav-list {
            display: flex;
            list-style: none;
            gap: 0.2rem 1rem;
            flex-wrap: wrap;
            padding: 0;
        }
        .nav-list a {
            font-weight: 600;
            font-size: 0.95rem;
            padding: 0.3rem 0.6rem;
            border-radius: 6px;
            color: #2c3e50;
        }
        .nav-list a:hover {
            background: #e8edf5;
            color: #c0392b;
            text-decoration: none;
        }
        .hamburger {
            display: none;
            background: none;
            border: none;
            font-size: 1.8rem;
            cursor: pointer;
            color: #1a1f2e;
            padding: 0.2rem 0.4rem;
            border-radius: 6px;
            transition: background 0.2s;
        }
        .hamburger:hover {
            background: #e8edf5;
        }
        @media (max-width: 768px) {
            .hamburger {
                display: block;
            }
            .nav-list {
                display: none;
                flex-direction: column;
                width: 100%;
                background: #ffffff;
                padding: 1rem 1.2rem;
                border-radius: 12px;
                box-shadow: 0 8px 24px rgba(0, 0, 0, 0.08);
                margin-top: 0.5rem;
                gap: 0.5rem 0;
            }
            .nav-list.open {
                display: flex;
            }
            .nav-list a {
                padding: 0.6rem 0.8rem;
                border-radius: 8px;
            }
            .header-row {
                flex-wrap: wrap;
            }
            .nav-wrapper {
                width: 100%;
                justify-content: space-between;
            }
        }
        .breadcrumb {
            display: flex;
            flex-wrap: wrap;
            list-style: none;
            padding: 0.6rem 0;
            font-size: 0.9rem;
            color: #5a6a7a;
            gap: 0.3rem 0.6rem;
            margin-bottom: 0.8rem;
        }
        .breadcrumb li+li::before {
            content: "›";
            margin-right: 0.6rem;
            color: #a0b0c0;
            font-weight: 600;
        }
        .breadcrumb a {
            color: #5a6a7a;
        }
        .breadcrumb a:hover {
            color: #c0392b;
        }
        .breadcrumb .current {
            color: #1a1f2e;
            font-weight: 600;
        }
        .main-grid {
            display: grid;
            grid-template-columns: 1fr 320px;
            gap: 2rem 2.5rem;
            margin: 1.5rem 0 2.5rem;
        }
        @media (max-width: 992px) {
            .main-grid {
                grid-template-columns: 1fr;
            }
        }
        .sidebar {
            position: sticky;
            top: 1.5rem;
            align-self: start;
        }
        .sidebar-card {
            background: #ffffff;
            border-radius: 16px;
            padding: 1.6rem 1.4rem;
            box-shadow: 0 4px 16px rgba(0, 0, 0, 0.04);
            margin-bottom: 1.5rem;
            border: 1px solid #eef2f7;
        }
        .sidebar-card h3 {
            font-size: 1.2rem;
            margin-bottom: 1rem;
            color: #1a1f2e;
            border-bottom: 2px solid #f0f3f8;
            padding-bottom: 0.6rem;
        }
        .sidebar-links {
            list-style: none;
            padding: 0;
        }
        .sidebar-links li {
            margin-bottom: 0.6rem;
        }
        .sidebar-links a {
            display: flex;
            align-items: center;
            gap: 0.6rem;
            padding: 0.5rem 0.6rem;
            border-radius: 8px;
            background: #f8faff;
            font-size: 0.92rem;
            color: #2c3e50;
            transition: background 0.2s, transform 0.1s;
        }
        .sidebar-links a:hover {
            background: #eef4ff;
            transform: translateX(4px);
            text-decoration: none;
        }
        .sidebar-links i {
            color: #c0392b;
            width: 1.2rem;
            text-align: center;
        }
        .content-area h1 {
            font-size: 2.6rem;
            font-weight: 800;
            line-height: 1.2;
            margin-bottom: 0.6rem;
            color: #1a1f2e;
            letter-spacing: -0.02em;
        }
        .content-area h2 {
            font-size: 1.9rem;
            font-weight: 700;
            margin-top: 2.8rem;
            margin-bottom: 0.8rem;
            color: #1a1f2e;
            border-left: 5px solid #c0392b;
            padding-left: 1rem;
        }
        .content-area h3 {
            font-size: 1.4rem;
            font-weight: 600;
            margin-top: 2rem;
            margin-bottom: 0.6rem;
            color: #2c3e50;
        }
        .content-area h4 {
            font-size: 1.15rem;
            font-weight: 600;
            margin-top: 1.5rem;
            margin-bottom: 0.4rem;
            color: #34495e;
        }
        .content-area p {
            margin-bottom: 1.2rem;
            color: #2c3e50;
        }
        .content-area .meta-line {
            font-size: 0.9rem;
            color: #6a7a8a;
            display: flex;
            flex-wrap: wrap;
            gap: 0.8rem 1.8rem;
            margin-bottom: 1.5rem;
            padding-bottom: 0.8rem;
            border-bottom: 1px solid #eef2f7;
        }
        .content-area .meta-line i {
            margin-right: 0.3rem;
        }
        .feature-img {
            margin: 1.8rem 0;
            border-radius: 16px;
            box-shadow: 0 8px 32px rgba(0, 0, 0, 0.06);
        }
        .feature-img figcaption {
            font-size: 0.85rem;
            color: #6a7a8a;
            text-align: center;
            margin-top: 0.6rem;
            font-style: italic;
        }
        .highlight-box {
            background: #fef9f0;
            border-left: 5px solid #e67e22;
            padding: 1.2rem 1.6rem;
            border-radius: 8px;
            margin: 1.5rem 0;
        }
        .highlight-box strong {
            color: #c0392b;
        }
        .data-table {
            width: 100%;
            border-collapse: collapse;
            margin: 1.8rem 0;
            border-radius: 12px;
            overflow: hidden;
            box-shadow: 0 2px 12px rgba(0, 0, 0, 0.04);
        }
        .data-table th {
            background: #1a1f2e;
            color: #fff;
            font-weight: 600;
            padding: 0.8rem 1rem;
            text-align: left;
        }
        .data-table td {
            padding: 0.7rem 1rem;
            border-bottom: 1px solid #eef2f7;
            background: #fff;
        }
        .data-table tr:last-child td {
            border-bottom: none;
        }
        .data-table tr:hover td {
            background: #f8faff;
        }
        .search-form {
            display: flex;
            gap: 0.5rem;
            margin: 1.2rem 0 1.8rem;
            flex-wrap: wrap;
        }
        .search-form input {
            flex: 1;
            min-width: 180px;
            padding: 0.7rem 1.2rem;
            border: 2px solid #e0e5ee;
            border-radius: 30px;
            font-size: 1rem;
            outline: none;
            transition: border 0.2s;
            background: #fff;
        }
        .search-form input:focus {
            border-color: #c0392b;
        }
        .search-form button {
            padding: 0.7rem 1.8rem;
            border: none;
            border-radius: 30px;
            background: #c0392b;
            color: #fff;
            font-weight: 600;
            font-size: 1rem;
            cursor: pointer;
            transition: background 0.2s, transform 0.1s;
            display: flex;
            align-items: center;
            gap: 0.5rem;
        }
        .search-form button:hover {
            background: #e74c3c;
            transform: scale(1.02);
        }
        .feedback-section {
            background: #ffffff;
            border-radius: 20px;
            padding: 2rem 2rem 2.5rem;
            margin: 2.5rem 0 1.5rem;
            box-shadow: 0 4px 20px rgba(0, 0, 0, 0.04);
            border: 1px solid #eef2f7;
        }
        .feedback-section h2 {
            margin-top: 0 !important;
            border-left: none !important;
            padding-left: 0 !important;
        }
        .rating-stars {
            display: flex;
            gap: 0.4rem;
            font-size: 2rem;
            direction: rtl;
            margin: 0.6rem 0 1rem;
        }
        .rating-stars input {
            display: none;
        }
        .rating-stars label {
            cursor: pointer;
            color: #d5dde8;
            transition: color 0.2s, transform 0.1s;
        }
        .rating-stars label:hover,
        .rating-stars label:hover~label,
        .rating-stars input:checked~label {
            color: #f1c40f;
            transform: scale(1.1);
        }
        .comment-form textarea {
            width: 100%;
            padding: 1rem 1.2rem;
            border: 2px solid #e0e5ee;
            border-radius: 14px;
            font-size: 1rem;
            resize: vertical;
            min-height: 110px;
            font-family: inherit;
            transition: border 0.2s;
            background: #fafcff;
        }
        .comment-form textarea:focus {
            border-color: #c0392b;
            outline: none;
        }
        .comment-form .form-actions {
            display: flex;
            gap: 0.8rem;
            flex-wrap: wrap;
            margin-top: 0.8rem;
        }
        .comment-form .form-actions button {
            padding: 0.7rem 2rem;
            border: none;
            border-radius: 30px;
            font-weight: 600;
            font-size: 1rem;
            cursor: pointer;
            transition: background 0.2s, transform 0.1s;
        }
        .comment-form .btn-primary {
            background: #c0392b;
            color: #fff;
        }
        .comment-form .btn-primary:hover {
            background: #e74c3c;
            transform: scale(1.02);
        }
        .comment-form .btn-secondary {
            background: #eef2f7;
            color: #2c3e50;
        }
        .comment-form .btn-secondary:hover {
            background: #dde3ec;
        }
        .site-footer {
            margin-top: 3rem;
            padding: 2rem 0 1.5rem;
            border-top: 2px solid #e0e5ee;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 1.5rem 2.5rem;
            margin-bottom: 1.8rem;
        }
        @media (max-width: 600px) {
            .footer-grid {
                grid-template-columns: 1fr;
            }
        }
        friend-link {
            display: block;
            font-style: normal;
        }
        friend-link a {
            display: inline-block;
            margin: 0.2rem 0.8rem 0.2rem 0;
            padding: 0.3rem 0.8rem;
            background: #eef2f7;
            border-radius: 20px;
            font-size: 0.9rem;
            color: #2c3e50;
            transition: background 0.2s;
        }
        friend-link a:hover {
            background: #dde3ec;
            text-decoration: none;
        }
        .copyright {
            text-align: center;
            font-size: 0.9rem;
            color: #6a7a8a;
            padding-top: 1.2rem;
            border-top: 1px solid #eef2f7;
        }
        @media (max-width: 768px) {
            .content-area h1 {
                font-size: 2rem;
            }
            .content-area h2 {
                font-size: 1.5rem;
            }
            .content-area h3 {
                font-size: 1.2rem;
            }
            .feedback-section {
                padding: 1.5rem 1.2rem;
            }
            .rating-stars {
                font-size: 1.6rem;
            }
        }
        @media (max-width: 480px) {
            body {
                padding: 0 0.5rem;
            }
            .container {
                padding: 0 0.3rem;
            }
            .my-logo {
                font-size: 1.5rem;
            }
            .search-form input {
                min-width: 120px;
            }
        }
        .scroll-top {
            position: fixed;
            bottom: 2rem;
            right: 2rem;
            background: #c0392b;
            color: #fff;
            width: 48px;
            height: 48px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.4rem;
            box-shadow: 0 4px 16px rgba(192, 57, 43, 0.3);
            opacity: 0;
            visibility: hidden;
            transition: opacity 0.3s, transform 0.2s;
            border: none;
            cursor: pointer;
            z-index: 999;
        }
        .scroll-top.visible {
            opacity: 1;
            visibility: visible;
        }
        .scroll-top:hover {
            transform: scale(1.08);
            background: #e74c3c;
        }
        .text-muted {
            color: #6a7a8a;
        }
        .mt-1 {
            margin-top: 1rem;
        }
        .mb-1 {
            margin-bottom: 1rem;
        }
        .flex-center {
            display: flex;
            align-items: center;
            gap: 0.5rem;
        }
        .gap-1 {
            gap: 1rem;
        }