@import url('https://fonts.googleapis.com/css2?family=Plus+Jakarta+Sans:wght@600;800&family=Noto+Sans+SC:wght@300;700;900&display=swap');
        
        :root { 
            --tg-blue: #24A1DE; 
            --tg-gradient: linear-gradient(135deg, #24A1DE 0%, #00E5FF 100%);
            --text-main: #0F172A;
            --text-gray: #4d5156;
            --border-color: #dfe1e5;
            --bg-light: #f8f9fa;
        }

        * { margin: 0; padding: 0; box-sizing: border-box; }
        body { 
            font-family: 'Plus Jakarta Sans', 'Noto Sans SC', sans-serif; 
            color: var(--text-main);
            line-height: 1.6;
        }

        /* Header phong cách 皮皮搜索 */
        .help-header {
            padding: 15px 5%;
            display: flex;
            align-items: center;
            border-bottom: 1px solid var(--border-color);
            background: #fff;
        }
        .logo {
            text-decoration: none;
            color: var(--tg-blue);
            font-weight: 900;
            font-size: 22px;
            letter-spacing: -0.5px;
        }
        .header-divider {
            margin: 0 15px;
            color: var(--border-color);
            font-weight: 300;
        }
        .help-label {
            color: var(--text-gray);
            font-weight: 600;
            font-size: 18px;
        }

        /* Hero Section với Gradient của trang Index */
        .hero-section {
            background-image: radial-gradient(at 0% 0%, rgba(36, 161, 222, 0.1) 0px, transparent 50%), 
                              radial-gradient(at 100% 100%, rgba(0, 229, 255, 0.05) 0px, transparent 50%);
            padding: 80px 20px;
            text-align: center;
        }
        .hero-section h1 {
            font-size: 2.5rem;
            font-weight: 800;
            /*margin-bottom: 30px;*/
        }
        .text-gradient { 
            background: var(--tg-gradient); 
            -webkit-background-clip: text; 
            -webkit-text-fill-color: transparent; 
        }

        /* Thanh tìm kiếm bo tròn giống trang Index */
        .search-wrapper {
            max-width: 700px;
            margin: 0 auto;
            position: relative;
            background: white;
            border-radius: 100px;
            display: flex;
            align-items: center;
            padding: 8px 8px 8px 25px;
            box-shadow: 0 10px 30px rgba(0,0,0,0.06);
            border: 1px solid #eee;
        }
        .search-wrapper input {
            flex: 1;
            border: none;
            outline: none;
            font-size: 1.1rem;
            padding: 10px;
        }
        .btn-search {
            background: var(--text-main);
            color: white;
            border: none;
            padding: 12px 30px;
            border-radius: 100px;
            font-weight: 700;
            cursor: pointer;
            transition: opacity 0.2s;
        }
        .btn-search:hover { opacity: 0.9; }

        /* Danh mục hỗ trợ phong cách Card */
        .content-container {
            max-width: 1100px;
            margin: 50px auto;
            padding: 0 20px;
        }
        .help-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 25px;
        }
        .help-card {
            text-decoration: none;
            padding: 30px;
            background: #fff;
            border: 1px solid #f1f5f9;
            border-radius: 20px;
            transition: all 0.3s ease;
            display: flex;
            flex-direction: column;
            gap: 15px;
        }
        .help-card:hover {
            border-color: var(--tg-blue);
            transform: translateY(-5px);
            box-shadow: 0 15px 30px rgba(36, 161, 222, 0.08);
        }
        .icon-box {
            width: 50px;
            height: 50px;
            background: rgba(36, 161, 222, 0.1);
            border-radius: 12px;
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--tg-blue);
            font-size: 20px;
        }
        .help-card h3 {
            color: var(--text-main);
            font-size: 1.25rem;
            font-weight: 700;
        }
        .help-card p {
            color: var(--text-gray);
            font-size: 0.95rem;
            line-height: 1.6;
        }

        /* Footer đồng bộ */
        .g-footer {
            background: #f2f2f2;
            border-top: 1px solid #dadce0;
            color: #70757a;
            font-size: 14px;
            margin-top: 80px;
            padding: 30px 5%;
            text-align: center;
        }
        .f-links {
            display: flex;
            justify-content: center;
            gap: 25px;
            margin-bottom: 15px;
        }
        .f-links a { text-decoration: none; color: inherit; font-weight: 500; }
        .f-links a:hover { color: var(--tg-blue); }

        @media (max-width: 768px) {
            .hero-section h1 { font-size: 1.8rem; }
            .help-header { padding: 15px 20px; }
            .help-grid { grid-template-columns: 1fr; }
        }