:root {
            --bg-color: #f0f2f5;
            --text-main: #1e293b;
            --text-muted: #64748b;
            --card-bg: #ffffff;
            
            /* Cores de Identidade de cada ferramenta */
            --color-htaccess: #3498db;
            --color-robots: #8e44ad;
            --color-docker: #2496ed;
            --color-nginx: #009639;
            --color-git: #F05032;
        }

        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
        }

        body {
            background-color: var(--bg-color);
            color: var(--text-main);
            line-height: 1.6;
            padding-bottom: 50px;
        }

        header {
            background-color: #1e293b;
            color: white;
            padding: 60px 20px;
            text-align: center;
            box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
        }

        header h1 {
            font-size: 2.5rem;
            margin-bottom: 10px;
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 15px;
        }

        header p {
            color: #cbd5e1;
            font-size: 1.1rem;
            max-width: 600px;
            margin: 0 auto;
        }

        /* Barra de Pesquisa */
        .search-container {
            max-width: 600px;
            margin: -25px auto 40px auto;
            padding: 0 20px;
            position: relative;
            z-index: 10;
        }

        .search-container input {
            width: 100%;
            padding: 18px 25px;
            font-size: 1.1rem;
            border: none;
            border-radius: 50px;
            box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
            outline: none;
            transition: box-shadow 0.3s;
        }

        .search-container input:focus {
            box-shadow: 0 10px 25px -3px rgba(52, 152, 219, 0.4);
        }

        /* Grid de Ferramentas */
        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }

        .grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
            gap: 30px;
        }

        /* Cartões (Cards) */
        .card {
            background: var(--card-bg);
            border-radius: 12px;
            padding: 30px;
            box-shadow: 0 4px 6px -1px rgba(0,0,0,0.05);
            transition: transform 0.3s ease, box-shadow 0.3s ease;
            display: flex;
            flex-direction: column;
            position: relative;
            overflow: hidden;
            text-decoration: none;
            color: var(--text-main);
        }

        .card:hover {
            transform: translateY(-8px);
            box-shadow: 0 20px 25px -5px rgba(0,0,0,0.1);
        }

        /* Bordas superiores coloridas */
        .card.htaccess { border-top: 5px solid var(--color-htaccess); }
        .card.robots { border-top: 5px solid var(--color-robots); }
        .card.docker { border-top: 5px solid var(--color-docker); }
        .card.nginx { border-top: 5px solid var(--color-nginx); }
        .card.git { border-top: 5px solid var(--color-git); }

        .card-header {
            display: flex;
            align-items: center;
            gap: 15px;
            margin-bottom: 15px;
        }

        .icon {
            font-size: 2.5rem;
        }

        .card h2 {
            font-size: 1.4rem;
        }

        .card p {
            color: var(--text-muted);
            font-size: 0.95rem;
            margin-bottom: 25px;
            flex-grow: 1;
        }

        /* Tags de Categoria */
        .tags {
            display: flex;
            gap: 8px;
            margin-bottom: 20px;
        }

        .tag {
            font-size: 0.75rem;
            padding: 4px 10px;
            border-radius: 20px;
            background-color: #e2e8f0;
            color: #475569;
            font-weight: 600;
        }

        /* Botão interno do card */
        .btn {
            display: inline-block;
            text-align: center;
            padding: 12px;
            border-radius: 6px;
            color: white;
            font-weight: bold;
            transition: opacity 0.2s;
            margin-top: auto;
        }

        .card:hover .btn { opacity: 0.9; }

        .card.htaccess .btn { background-color: var(--color-htaccess); }
        .card.robots .btn { background-color: var(--color-robots); }
        .card.docker .btn { background-color: var(--color-docker); }
        .card.nginx .btn { background-color: var(--color-nginx); }
        .card.git .btn { background-color: var(--color-git); }

        /* Mensagem de "Nenhum resultado" */
        .no-results {
            text-align: center;
            grid-column: 1 / -1;
            padding: 40px;
            color: var(--text-muted);
            font-size: 1.2rem;
            display: none;
        }

        @media (max-width: 768px) {
            header h1 { font-size: 2rem; }
            .grid { grid-template-columns: 1fr; }
        }