* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        body {
            font-family: 'Segoe UI', Roboto, system-ui, -apple-system, sans-serif;
            background: #f8fafc;
            color: #1e293b;
            line-height: 1.7;
            padding: 0 16px;
        }
        .container {
            max-width: 1200px;
            margin: 0 auto;
            background: #fff;
            box-shadow: 0 4px 24px rgba(0, 0, 0, 0.04);
            border-radius: 20px;
            padding: 20px 28px;
        }
        header {
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            justify-content: space-between;
            padding: 16px 0 12px;
            border-bottom: 2px solid #e9f0f5;
            position: relative;
        }
        .my-logo {
            font-size: 1.9rem;
            font-weight: 800;
            letter-spacing: -0.5px;
            background: linear-gradient(135deg, #0b4f6c, #1d7a9c);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            text-decoration: none;
            display: flex;
            align-items: center;
            gap: 6px;
        }
        .my-logo i {
            -webkit-text-fill-color: initial;
            color: #1d7a9c;
            font-size: 2rem;
        }
        .my-logo:hover {
            opacity: 0.85;
        }
        .hamburger {
            display: none;
            font-size: 1.8rem;
            cursor: pointer;
            background: none;
            border: none;
            color: #0b4f6c;
            padding: 4px 8px;
        }
        nav {
            display: flex;
            gap: 10px 20px;
            flex-wrap: wrap;
            align-items: center;
        }
        nav a {
            text-decoration: none;
            color: #1e293b;
            font-weight: 600;
            font-size: 0.95rem;
            padding: 6px 12px;
            border-radius: 40px;
            transition: background 0.2s, color 0.2s;
        }
        nav a:hover {
            background: #e3f0f7;
            color: #0b4f6c;
        }
        .nav-active {
            background: #0b4f6c;
            color: #fff !important;
        }
        .breadcrumb {
            padding: 16px 0 8px;
            font-size: 0.9rem;
            color: #5f6c7a;
            display: flex;
            flex-wrap: wrap;
            gap: 6px 12px;
            list-style: none;
        }
        .breadcrumb li {
            display: inline;
        }
        .breadcrumb li+li::before {
            content: "›";
            margin-right: 10px;
            color: #9aa6b5;
            font-weight: 600;
        }
        .breadcrumb a {
            color: #1d7a9c;
            text-decoration: none;
        }
        .breadcrumb a:hover {
            text-decoration: underline;
        }
        h1 {
            font-size: 2.6rem;
            font-weight: 800;
            line-height: 1.2;
            margin: 28px 0 16px;
            color: #0b2b38;
            letter-spacing: -0.02em;
        }
        h2 {
            font-size: 1.9rem;
            font-weight: 700;
            margin: 48px 0 16px;
            color: #0b4f6c;
            border-left: 6px solid #1d7a9c;
            padding-left: 18px;
        }
        h3 {
            font-size: 1.4rem;
            font-weight: 700;
            margin: 32px 0 12px;
            color: #1a5d7a;
        }
        h4 {
            font-size: 1.15rem;
            font-weight: 600;
            margin: 24px 0 10px;
            color: #2c6f8f;
        }
        p {
            margin-bottom: 18px;
            font-size: 1.05rem;
            color: #1e293b;
        }
        .highlight {
            background: #eef7fb;
            padding: 3px 10px;
            border-radius: 20px;
            font-weight: 600;
        }
        .badge {
            display: inline-block;
            background: #f59e0b;
            color: #1e293b;
            padding: 2px 14px;
            border-radius: 30px;
            font-size: 0.8rem;
            font-weight: 700;
            letter-spacing: 0.3px;
        }
        .code-box {
            background: #0b2b38;
            color: #e6f7ff;
            padding: 14px 22px;
            border-radius: 14px;
            font-family: 'Courier New', monospace;
            font-size: 1.1rem;
            display: inline-block;
            margin: 8px 0;
            border-left: 6px solid #fbbf24;
            word-break: break-all;
        }
        .btn {
            display: inline-block;
            background: #1d7a9c;
            color: #fff;
            padding: 10px 28px;
            border-radius: 40px;
            font-weight: 700;
            text-decoration: none;
            transition: background 0.2s, transform 0.1s;
            border: none;
            cursor: pointer;
            font-size: 1rem;
        }
        .btn:hover {
            background: #0b4f6c;
            transform: scale(1.02);
        }
        .btn-secondary {
            background: #e9f0f5;
            color: #1e293b;
        }
        .btn-secondary:hover {
            background: #d0e2ed;
        }
        img {
            max-width: 100%;
            height: auto;
            border-radius: 20px;
            margin: 24px 0;
            box-shadow: 0 8px 28px rgba(0, 0, 0, 0.06);
        }
        .table-wrap {
            overflow-x: auto;
            margin: 24px 0;
        }
        table {
            width: 100%;
            border-collapse: collapse;
            background: #f9fcfe;
            border-radius: 16px;
            overflow: hidden;
            font-size: 0.98rem;
        }
        th {
            background: #0b4f6c;
            color: #fff;
            padding: 14px 18px;
            text-align: left;
            font-weight: 600;
        }
        td {
            padding: 14px 18px;
            border-bottom: 1px solid #e2edf4;
        }
        tr:last-child td {
            border-bottom: none;
        }
        tr:hover td {
            background: #f0f7fc;
        }
        .emoji-big {
            font-size: 1.8rem;
        }
        .card-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
            gap: 24px;
            margin: 30px 0;
        }
        .card {
            background: #f9fcfe;
            border-radius: 20px;
            padding: 24px 20px;
            border: 1px solid #e2edf4;
            transition: box-shadow 0.25s, transform 0.2s;
        }
        .card:hover {
            box-shadow: 0 12px 32px rgba(13, 76, 110, 0.08);
            transform: translateY(-4px);
        }
        .card i {
            color: #1d7a9c;
            font-size: 2.2rem;
            margin-bottom: 14px;
        }
        .card h4 {
            margin-top: 0;
        }
        .search-section {
            background: #eef7fb;
            border-radius: 24px;
            padding: 32px 28px;
            margin: 40px 0;
        }
        .search-form {
            display: flex;
            flex-wrap: wrap;
            gap: 12px;
            max-width: 640px;
        }
        .search-form input {
            flex: 1 1 260px;
            padding: 14px 20px;
            border-radius: 40px;
            border: 2px solid #d0e2ed;
            font-size: 1rem;
            background: #fff;
            outline: none;
            transition: border 0.2s;
        }
        .search-form input:focus {
            border-color: #1d7a9c;
        }
        .feedback-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 28px;
            margin: 36px 0;
        }
        @media (max-width:720px) {
            .feedback-grid {
                grid-template-columns: 1fr;
            }
        }
        .feedback-card {
            background: #f9fcfe;
            border-radius: 24px;
            padding: 28px 24px;
            border: 1px solid #e2edf4;
        }
        .feedback-card h3 {
            margin-top: 0;
        }
        .feedback-card form {
            display: flex;
            flex-direction: column;
            gap: 14px;
        }
        .feedback-card input,
        .feedback-card textarea,
        .feedback-card select {
            padding: 12px 18px;
            border-radius: 16px;
            border: 2px solid #dbe7ef;
            font-size: 0.98rem;
            background: #fff;
            outline: none;
            transition: border 0.2s;
            font-family: inherit;
        }
        .feedback-card input:focus,
        .feedback-card textarea:focus,
        .feedback-card select:focus {
            border-color: #1d7a9c;
        }
        .feedback-card textarea {
            min-height: 100px;
            resize: vertical;
        }
        .star-rating {
            display: flex;
            flex-direction: row-reverse;
            justify-content: flex-end;
            gap: 4px;
        }
        .star-rating input {
            display: none;
        }
        .star-rating label {
            font-size: 2rem;
            color: #d0dae4;
            cursor: pointer;
            transition: color 0.15s;
        }
        .star-rating input:checked~label,
        .star-rating label:hover,
        .star-rating label:hover~label {
            color: #f59e0b;
        }
        friend-link {
            display: block;
            padding: 28px 0 20px;
            border-top: 2px solid #e9f0f5;
            margin-top: 40px;
        }
        friend-link h3 {
            margin-top: 0;
            font-size: 1.3rem;
        }
        friend-link ul {
            display: flex;
            flex-wrap: wrap;
            gap: 10px 24px;
            list-style: none;
            padding: 0;
        }
        friend-link ul li a {
            color: #1d7a9c;
            text-decoration: none;
            font-weight: 500;
        }
        friend-link ul li a:hover {
            text-decoration: underline;
        }
        footer {
            padding: 20px 0 10px;
            font-size: 0.9rem;
            color: #5f6c7a;
            border-top: 1px solid #e2edf4;
            margin-top: 16px;
            text-align: center;
        }
        footer a {
            color: #1d7a9c;
            text-decoration: none;
        }
        .last-update {
            display: inline-block;
            background: #e9f0f5;
            padding: 4px 18px;
            border-radius: 30px;
            font-size: 0.85rem;
            color: #1e5a72;
            margin: 10px 0 20px;
        }
        @media (max-width:760px) {
            .hamburger {
                display: block;
            }
            nav {
                display: none;
                width: 100%;
                flex-direction: column;
                padding: 18px 0 8px;
                gap: 8px;
                border-top: 1px solid #e2edf4;
                margin-top: 12px;
            }
            nav.open {
                display: flex;
            }
            nav a {
                width: 100%;
                padding: 12px 16px;
                border-radius: 12px;
            }
            .container {
                padding: 16px;
            }
            h1 {
                font-size: 1.9rem;
            }
            h2 {
                font-size: 1.5rem;
            }
            .my-logo {
                font-size: 1.5rem;
            }
        }
        @media (max-width:480px) {
            .code-box {
                font-size: 0.9rem;
                padding: 10px 16px;
            }
            .btn {
                padding: 8px 20px;
                font-size: 0.9rem;
            }
        }
        .toc {
            background: #f2f8fc;
            border-radius: 20px;
            padding: 24px 28px;
            margin: 20px 0 30px;
        }
        .toc a {
            color: #1d7a9c;
            text-decoration: none;
        }
        .toc a:hover {
            text-decoration: underline;
        }
        .toc ul {
            list-style: none;
            padding: 0;
            columns: 2 220px;
            column-gap: 30px;
        }
        .toc li {
            padding: 4px 0;
            break-inside: avoid;
        }
        .toc li::before {
            content: "🎣 ";
            font-size: 0.9rem;
        }
        .pro-tip {
            background: #e3f0f7;
            border-radius: 18px;
            padding: 20px 24px;
            margin: 24px 0;
            border-left: 6px solid #f59e0b;
        }
        .pro-tip i {
            color: #f59e0b;
            margin-right: 10px;
        }
        .quote-block {
            background: #fffbf0;
            border-radius: 18px;
            padding: 22px 26px;
            margin: 24px 0;
            border-left: 6px solid #fbbf24;
            font-style: italic;
        }