:root {
            --primary: #0288d1;
            --primary-dark: #01579b;
            --primary-light: #e0f7fa;
            --secondary: #00bcd4;
            --accent: #ff7043;
            --success: #66bb6a;
            --bg: #f0f9ff;
            --card-bg: rgba(255, 255, 255, 0.85);
            --text: #263238;
            --text-light: #546e7a;
            --border: rgba(2, 136, 209, 0.15);
            --shadow: 0 8px 32px rgba(2, 136, 209, 0.12);
            --radius: 20px;
        }

        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }

        @keyframes fadeInUp {
            from {
                opacity: 0;
                transform: translateY(30px);
            }

            to {
                opacity: 1;
                transform: translateY(0);
            }
        }

        @keyframes float {

            0%,
            100% {
                transform: translateY(0);
            }

            50% {
                transform: translateY(-10px);
            }
        }

        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            background: var(--bg);
            color: var(--text);
            line-height: 1.7;
        }

        header {
            background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
            color: white;
            padding: 1rem 0;
            position: sticky;
            top: 0;
            z-index: 1000;
            box-shadow: 0 4px 20px rgba(2, 136, 209, 0.3);
        }

        .header-content {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 1.5rem;
            display: flex;
            justify-content: space-between;
            align-items: center;
        }

        .logo {
            display: flex;
            align-items: center;
            gap: 0.75rem;
            font-size: 1.5rem;
            font-weight: 800;
            text-decoration: none;
            color: white;
        }

        .logo-icon {
            font-size: 2rem;
            animation: float 3s ease-in-out infinite;
        }

        .nav-menu {
            display: flex;
            gap: 0.5rem;
            list-style: none;
        }

        .nav-menu a {
            color: rgba(255, 255, 255, 0.9);
            text-decoration: none;
            padding: 0.5rem 1rem;
            border-radius: 12px;
            transition: all 0.3s;
            font-weight: 600;
            font-size: 0.9rem;
        }

        .nav-menu a:hover,
        .nav-menu a.active {
            background: rgba(255, 255, 255, 0.2);
            color: white;
        }

        .mobile-menu-btn {
            display: none;
            background: none;
            border: none;
            color: white;
            font-size: 1.5rem;
            cursor: pointer;
        }

        main {
            max-width: 1200px;
            margin: 0 auto;
            padding: 2rem 1.5rem;
            min-height: calc(100vh - 300px);
        }

        .hero {
            text-align: center;
            padding: 3rem 1rem;
            animation: fadeInUp 0.8s ease-out;
        }

        .hero h1 {
            font-size: 2.2rem;
            color: var(--primary-dark);
            margin-bottom: 1rem;
        }

        .hero p {
            font-size: 1.1rem;
            color: var(--text-light);
            max-width: 600px;
            margin: 0 auto;
        }

        .card {
            background: var(--card-bg);
            backdrop-filter: blur(12px);
            border: 1px solid var(--border);
            border-radius: var(--radius);
            padding: 2rem;
            margin-bottom: 2rem;
            box-shadow: var(--shadow);
            animation: fadeInUp 0.6s ease-out;
        }

        .card-title {
            font-size: 1.3rem;
            color: var(--primary-dark);
            margin-bottom: 1.5rem;
            display: flex;
            align-items: center;
            gap: 0.75rem;
        }

        .card-title .icon {
            font-size: 1.5rem;
        }

        .tip-card {
            background: white;
            border-radius: var(--radius);
            padding: 1.5rem;
            margin-bottom: 1rem;
            border-right: 4px solid var(--primary);
            box-shadow: var(--shadow);
            transition: all 0.3s;
        }

        .tip-card:hover {
            transform: translateX(-5px);
        }

        .tip-card .category {
            display: inline-block;
            background: var(--primary-light);
            color: var(--primary-dark);
            padding: 0.25rem 0.75rem;
            border-radius: 20px;
            font-size: 0.8rem;
            font-weight: 700;
            margin-bottom: 0.5rem;
        }

        .tip-card h4 {
            color: var(--text);
            margin-bottom: 0.5rem;
            font-size: 1.1rem;
        }

        .tip-card p {
            color: var(--text-light);
            font-size: 0.95rem;
            line-height: 1.8;
        }

        .tip-card ul {
            padding-right: 1.2rem;
            margin-top: 0.5rem;
        }

        .tip-card li {
            color: var(--text-light);
            font-size: 0.9rem;
            margin-bottom: 0.4rem;
            line-height: 1.7;
        }

        .references {
            background: #f5f5f5;
            border-radius: var(--radius);
            padding: 1.5rem;
            margin-top: 1.5rem;
        }

        .references h4 {
            color: var(--primary-dark);
            margin-bottom: 1rem;
            font-size: 1.1rem;
        }

        .references ol {
            padding-right: 1.2rem;
        }

        .references li {
            margin-bottom: 0.75rem;
            font-size: 0.85rem;
            color: var(--text-light);
            line-height: 1.8;
        }

        .references a {
            color: var(--primary);
            text-decoration: none;
        }

        .references a:hover {
            text-decoration: underline;
        }

        .table-container {
            overflow-x: auto;
            margin: 1.5rem 0;
        }

        table {
            width: 100%;
            border-collapse: collapse;
            background: white;
            border-radius: 12px;
            overflow: hidden;
            box-shadow: var(--shadow);
        }

        th {
            background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
            color: white;
            padding: 1rem;
            text-align: right;
            font-weight: 700;
        }

        td {
            padding: 1rem;
            border-bottom: 1px solid var(--border);
            color: var(--text-light);
        }

        tr:hover {
            background: var(--primary-light);
        }

        tr:last-child td {
            border-bottom: none;
        }

        footer {
            background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary) 100%);
            color: white;
            padding: 3rem 0 1.5rem;
            margin-top: 4rem;
        }

        .footer-content {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 1.5rem;
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 2rem;
        }

        .footer-section h4 {
            font-size: 1.1rem;
            margin-bottom: 1rem;
            color: #b3e5fc;
        }

        .footer-section ul {
            list-style: none;
        }

        .footer-section li {
            margin-bottom: 0.5rem;
        }

        .footer-section a {
            color: rgba(255, 255, 255, 0.8);
            text-decoration: none;
            transition: all 0.3s;
            font-size: 0.9rem;
        }

        .footer-section a:hover {
            color: white;
            padding-right: 5px;
        }

        .footer-bottom {
            text-align: center;
            padding-top: 2rem;
            margin-top: 2rem;
            border-top: 1px solid rgba(255, 255, 255, 0.1);
            color: rgba(255, 255, 255, 0.6);
            font-size: 0.85rem;
        }

        @media (max-width: 768px) {
            .nav-menu {
                display: none;
                width: 100%;
                flex-direction: column;
                margin-top: 1rem;
                background: rgba(0, 0, 0, 0.1);
                border-radius: 12px;
                padding: 0.5rem;
            }

            .nav-menu.active {
                display: flex;
            }

            .mobile-menu-btn {
                display: block;
            }

            .hero h1 {
                font-size: 1.8rem;
            }

            .footer-content {
                grid-template-columns: 1fr;
                text-align: center;
            }
        }