* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        body {
            font-family: 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
            background: #f5f7fb;
            color: #1e2a3e;
            line-height: 1.7;
            font-size: 16px;
            padding: 0 16px;
        }
        a {
            color: #2c6b9e;
            text-decoration: none;
            transition: color 0.2s ease;
        }
        a:hover {
            color: #1a4a6f;
            text-decoration: underline;
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
            border-radius: 12px;
        }
        .container {
            max-width: 1200px;
            margin: 0 auto;
            background: #fff;
            box-shadow: 0 8px 30px rgba(0, 0, 0, 0.05);
            border-radius: 20px;
            padding: 24px 28px 32px;
            margin-top: 20px;
            margin-bottom: 40px;
        }
        .site-header {
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            justify-content: space-between;
            padding-bottom: 16px;
            border-bottom: 2px solid #e9edf4;
            margin-bottom: 20px;
            position: relative;
        }
        .my-logo {
            font-size: 28px;
            font-weight: 800;
            letter-spacing: -0.5px;
            background: linear-gradient(135deg, #2c6b9e, #6f4e8e);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            text-decoration: none;
        }
        .my-logo:hover {
            text-decoration: none;
            opacity: 0.85;
        }
        .nav-toggle {
            display: none;
            background: none;
            border: 2px solid #2c6b9e;
            color: #2c6b9e;
            font-size: 22px;
            padding: 6px 14px;
            border-radius: 8px;
            cursor: pointer;
        }
        .nav-toggle:hover {
            background: #2c6b9e;
            color: #fff;
        }
        .main-nav {
            display: flex;
            flex-wrap: wrap;
            gap: 6px 18px;
            align-items: center;
        }
        .main-nav a {
            font-weight: 500;
            font-size: 15px;
            color: #2c3e50;
            padding: 4px 0;
            border-bottom: 2px solid transparent;
        }
        .main-nav a:hover {
            border-bottom-color: #2c6b9e;
            text-decoration: none;
        }
        .main-nav a.active {
            border-bottom-color: #2c6b9e;
            color: #2c6b9e;
        }
        .breadcrumb {
            display: flex;
            flex-wrap: wrap;
            list-style: none;
            font-size: 14px;
            margin-bottom: 20px;
            padding: 8px 0;
            color: #6b7a8f;
        }
        .breadcrumb li+li::before {
            content: "›";
            margin: 0 10px;
            color: #b0c0d0;
        }
        .breadcrumb a {
            color: #2c6b9e;
        }
        h1 {
            font-size: 36px;
            font-weight: 800;
            line-height: 1.25;
            margin-bottom: 16px;
            color: #0f1a2e;
        }
        h2 {
            font-size: 28px;
            font-weight: 700;
            margin-top: 48px;
            margin-bottom: 14px;
            color: #1a2a44;
            border-left: 6px solid #2c6b9e;
            padding-left: 18px;
        }
        h3 {
            font-size: 22px;
            font-weight: 600;
            margin-top: 32px;
            margin-bottom: 10px;
            color: #233a5a;
        }
        h4 {
            font-size: 18px;
            font-weight: 600;
            margin-top: 22px;
            margin-bottom: 8px;
            color: #2c4a6e;
        }
        p {
            margin-bottom: 18px;
            font-size: 16px;
        }
        .feature-img {
            margin: 24px 0 28px;
            border-radius: 14px;
            box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
        }
        .highlight-box {
            background: #f0f4fe;
            border-left: 6px solid #2c6b9e;
            padding: 18px 22px;
            border-radius: 0 12px 12px 0;
            margin: 24px 0;
        }
        .highlight-box strong {
            color: #1a3a5e;
        }
        .emoji-big {
            font-size: 28px;
            margin-right: 6px;
        }
        .btn {
            display: inline-block;
            background: #2c6b9e;
            color: #fff;
            padding: 10px 26px;
            border-radius: 30px;
            font-weight: 600;
            font-size: 15px;
            transition: background 0.2s ease, transform 0.15s ease;
            border: none;
            cursor: pointer;
        }
        .btn:hover {
            background: #1a4a6f;
            transform: translateY(-2px);
            text-decoration: none;
            color: #fff;
        }
        .btn-sm {
            padding: 6px 18px;
            font-size: 14px;
        }
        .form-card {
            background: #f8faff;
            border-radius: 16px;
            padding: 24px 28px;
            margin: 32px 0;
            border: 1px solid #e0e8f2;
        }
        .form-card label {
            font-weight: 600;
            display: block;
            margin-bottom: 4px;
            font-size: 15px;
        }
        .form-card input,
        .form-card textarea,
        .form-card select {
            width: 100%;
            padding: 12px 16px;
            border: 1.5px solid #d0dae8;
            border-radius: 8px;
            font-size: 15px;
            background: #fff;
            transition: border 0.2s ease;
            margin-bottom: 16px;
        }
        .form-card input:focus,
        .form-card textarea:focus {
            border-color: #2c6b9e;
            outline: none;
            box-shadow: 0 0 0 3px rgba(44, 107, 158, 0.1);
        }
        .form-card textarea {
            min-height: 100px;
            resize: vertical;
        }
        .star-rating {
            display: flex;
            flex-direction: row-reverse;
            justify-content: flex-end;
            gap: 4px;
            font-size: 28px;
            margin-bottom: 16px;
        }
        .star-rating input {
            display: none;
        }
        .star-rating label {
            cursor: pointer;
            color: #d0dae8;
            transition: color 0.15s ease;
            font-size: 30px;
        }
        .star-rating label:hover,
        .star-rating label:hover~label,
        .star-rating input:checked~label {
            color: #f5b342;
        }
        .site-footer {
            margin-top: 48px;
            padding-top: 24px;
            border-top: 2px solid #e9edf4;
            font-size: 14px;
            color: #5a6e84;
        }
        .friend-link {
            display: flex;
            flex-wrap: wrap;
            gap: 12px 24px;
            padding: 16px 0;
            margin-bottom: 12px;
            border-bottom: 1px solid #eef2f8;
        }
        .friend-link a {
            font-weight: 500;
            color: #2c6b9e;
        }
        .copyright {
            padding: 12px 0 4px;
            text-align: center;
            font-size: 14px;
            color: #6b7f99;
        }
        .last-update {
            text-align: right;
            font-size: 14px;
            color: #7a8ea8;
            margin-top: 12px;
            font-style: italic;
        }
        @media (max-width: 768px) {
            .container {
                padding: 16px;
                margin-top: 12px;
                border-radius: 14px;
            }
            h1 {
                font-size: 26px;
            }
            h2 {
                font-size: 22px;
                padding-left: 12px;
            }
            h3 {
                font-size: 18px;
            }
            .site-header {
                flex-wrap: wrap;
            }
            .nav-toggle {
                display: inline-block;
            }
            .main-nav {
                display: none;
                width: 100%;
                flex-direction: column;
                gap: 6px;
                padding: 16px 0 8px;
                border-top: 1px solid #e9edf4;
                margin-top: 12px;
            }
            .main-nav.open {
                display: flex;
            }
            .main-nav a {
                padding: 8px 0;
                font-size: 16px;
            }
            .breadcrumb {
                font-size: 13px;
            }
            .form-card {
                padding: 18px;
            }
            .star-rating label {
                font-size: 26px;
            }
            .friend-link {
                flex-direction: column;
                gap: 6px;
            }
        }
        @media (min-width: 769px) {
            .nav-toggle {
                display: none !important;
            }
            .main-nav {
                display: flex !important;
            }
        }
        .mt-2 {
            margin-top: 16px;
        }
        .mb-2 {
            margin-bottom: 16px;
        }
        .flex-between {
            display: flex;
            justify-content: space-between;
            flex-wrap: wrap;
            align-items: center;
        }
        .text-muted {
            color: #6b7f99;
            font-size: 14px;
        }
        .table-wrap {
            overflow-x: auto;
            margin: 20px 0;
        }
        table {
            width: 100%;
            border-collapse: collapse;
            font-size: 15px;
        }
        table th,
        table td {
            padding: 10px 14px;
            border: 1px solid #dde3ee;
            text-align: left;
        }
        table th {
            background: #eef3fa;
            font-weight: 600;
        }
        .toc {
            background: #f6f9ff;
            border-radius: 14px;
            padding: 18px 22px;
            margin: 20px 0 28px;
            border: 1px solid #dce5f0;
        }
        .toc ul {
            list-style: none;
            padding-left: 0;
        }
        .toc li {
            padding: 4px 0;
        }
        .toc a {
            font-weight: 500;
        }