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

        :root {
            --primary-green: #229920;
            --dark-green: #1a7515;
            --light-green: #d4edda;
            --lighter-green: #e8f5e9;
            --text-dark: #1f2937;
            --text-light: #6b7280;
            --border-color: #e5e7eb;
            --bg-light: #f9fafb;
        }

        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            color: var(--text-dark);
            background-color: #ffffff;
            line-height: 1.6;
        }

        /* Header Section */
        .header {

            background-size: cover;
            background-position: center;
            background-attachment: fixed;
            padding: 40px 20px;
        }

        .header-content {
            max-width: 1200px;
            margin: 0 auto;
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 40px;
            align-items: center;
        }

        .header-left {
            display: flex;
            flex-direction: column;
            gap: 20px;
        }

        .icon-box {
            width: 80px;
            height: 80px;
            background: linear-gradient(135deg, var(--primary-green) 0%, var(--dark-green) 100%);
            border-radius: 16px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 40px;
        }

        .header-title {
            font-size: 48px;
            font-weight: 700;
            color: var(--text-dark);
            line-height: 1.2;
        }

        .header-subtitle {
            font-size: 18px;
            color: var(--text-light);
            font-weight: 500;
        }

        .stats {
            display: flex;
            gap: 30px;
            margin-top: 20px;
            flex-wrap: wrap;
        }

        .stat-item {
            display: flex;
            gap: 10px;
            align-items: center;
        }

        .stat-icon {
            width: 30px;
            height: 30px;
            background-color: var(--light-green);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 16px;
            color: var(--dark-green);
        }

        .stat-text {
            display: flex;
            flex-direction: column;
            font-size: 14px;
        }

        .stat-label {
            color: var(--text-light);
            font-size: 12px;
        }

        .stat-value {
            color: var(--text-dark);
            font-weight: 600;
        }

        .buttons {
            display: flex;
            gap: 15px;
            margin-top: 30px;
            flex-wrap: wrap;
        }

        .btn {
            padding: 12px 28px;
            border: none;
            border-radius: 8px;
            font-size: 16px;
            font-weight: 600;
            cursor: pointer;
            transition: all 0.3s ease;
            text-decoration: none;
            display: inline-block;
        }

        .btn-primary {
            background: var(--primary-green);
            color: white;
        }

        .btn-primary:hover {
            background: var(--dark-green);
            transform: translateY(-2px);
            box-shadow: 0 10px 20px rgba(16, 185, 129, 0.3);
        }

        .btn-secondary {
            background: white;
            color: var(--primary-green);
            border: 2px solid var(--primary-green);
        }

        .btn-secondary:hover {
            background: var(--lighter-green);
        }

        .header-right {
            display: none;
        }

        /* Navigation Tabs */
        .tabs {
            border-bottom: 2px solid var(--border-color);
            display: flex;
            gap: 40px;
            max-width: 1200px;
            margin: 40px auto;
            padding: 0 20px;
            flex-wrap: wrap;
        }

        .tab {
            padding: 15px 0;
            background: none;
            border: none;
            cursor: pointer;
            font-size: 15px;
            font-weight: 500;
            color: var(--text-light);
            border-bottom: 3px solid transparent;
            transition: all 0.3s ease;
        }

        .tab.active {
            color: var(--primary-green);
            border-bottom-color: var(--primary-green);
        }

        .tab:hover {
            color: var(--primary-green);
        }

        /* Tab Content */
        .tab-content {
            display: none;
        }

        .tab-content.active {
            display: block;
            animation: fadeIn 0.3s ease-in;
        }

        @keyframes fadeIn {
            from {
                opacity: 0;
                transform: translateY(10px);
            }

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

        /* Main Content */
        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }

        .content-grid {
            display: grid;
            grid-template-columns: 2fr 1fr;
            gap: 40px;
            margin-bottom: 60px;
        }

        /* Section */
        .section {
            margin-bottom: 60px;
        }

        .section-title {
            font-size: 28px;
            font-weight: 700;
            margin-bottom: 25px;
            color: var(--text-dark);
        }

        .section-description {
            color: var(--text-light);
            line-height: 1.8;
            margin-bottom: 30px;
        }

        /* Features Grid */
        .features {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 30px;
            margin: 40px 0;
        }

        .feature-card {
            text-align: center;
            padding: 30px 20px;
            border-radius: 12px;
            background: var(--lighter-green);
            transition: all 0.3s ease;
        }

        .feature-card:hover {
            transform: translateY(-5px);
            box-shadow: 0 10px 25px rgba(16, 185, 129, 0.15);
        }

        .feature-icon {
            font-size: 40px;
            margin-bottom: 15px;
        }

        .feature-title {
            font-size: 16px;
            font-weight: 600;
            margin-bottom: 10px;
            color: var(--text-dark);
        }

        .feature-desc {
            font-size: 14px;
            color: var(--text-light);
        }

        /* Learning Points */
        .learning-list {
            display: flex;
            flex-direction: column;
            gap: 15px;
        }

        .learning-item {
            display: flex;
            gap: 15px;
            align-items: flex-start;
            padding: 15px;
            background: var(--bg-light);
            border-radius: 8px;
            border-left: 4px solid var(--primary-green);
        }

        .learning-icon {
            width: 24px;
            height: 24px;
            background: var(--primary-green);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            color: white;
            font-size: 14px;
            flex-shrink: 0;
            margin-top: 2px;
        }

        .learning-text {
            color: var(--text-dark);
            font-weight: 500;
        }

        /* Course Content */
        .module {
            border: 1px solid var(--border-color);
            border-radius: 8px;
            margin-bottom: 12px;
            overflow: hidden;
            transition: all 0.3s ease;
        }

        .module:hover {
            border-color: var(--primary-green);
            box-shadow: 0 4px 12px rgba(16, 185, 129, 0.1);
        }

        .module-header {
            padding: 20px;
            background: var(--lighter-green);
            display: flex;
            justify-content: space-between;
            align-items: center;
            cursor: pointer;
            user-select: none;
        }

        .module-title {
            font-weight: 600;
            color: var(--text-dark);
            display: flex;
            align-items: center;
            gap: 15px;
        }

        .module-number {
            width: 35px;
            height: 35px;
            background: var(--primary-green);
            color: white;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 700;
            font-size: 14px;
        }

        .toggle-icon {
            font-size: 20px;
            color: var(--primary-green);
            transition: transform 0.3s ease;
        }

        .module-content {
            padding: 20px;
            background: white;
            display: none;
            color: var(--text-light);
            line-height: 1.8;
        }

        .module-content.active {
            display: block;
        }

        /* Course Details */
        .details-card {
            background: var(--bg-light);
            padding: 30px;
            border-radius: 12px;
            border: 1px solid var(--border-color);
        }

        .detail-item {
            margin-bottom: 25px;
            padding-bottom: 25px;
            border-bottom: 1px solid var(--border-color);
        }

        .detail-item:last-child {
            border-bottom: none;
            margin-bottom: 0;
            padding-bottom: 0;
        }

        .detail-label {
            font-size: 12px;
            color: var(--text-light);
            text-transform: uppercase;
            letter-spacing: 1px;
            margin-bottom: 8px;
        }

        .detail-value {
            font-size: 16px;
            font-weight: 600;
            color: var(--text-dark);
        }

        .detail-badge {
            display: inline-block;
            background: var(--light-green);
            color: var(--dark-green);
            padding: 6px 12px;
            border-radius: 20px;
            font-size: 13px;
            font-weight: 600;
        }

        /* Responsive */
        @media (max-width: 768px) {
            .header-content {
                grid-template-columns: 1fr;
            }

            .header-title {
                font-size: 36px;
            }

            .header-subtitle {
                font-size: 16px;
            }

            .stats {
                gap: 15px;
            }

            .content-grid {
                grid-template-columns: 1fr;
            }

            .tabs {
                gap: 20px;
                margin: 30px auto;
            }

            .features {
                grid-template-columns: 1fr;
            }

            .buttons {
                flex-direction: column;
            }

            .btn {
                width: 100%;
                text-align: center;
            }

            .section-title {
                font-size: 24px;
            }

            .stat-item {
                gap: 8px;
            }
        }

        @media (max-width: 480px) {
            .header {
                padding: 30px 15px;
            }

            .header-title {
                font-size: 28px;
            }

            .stats {
                flex-direction: column;
                gap: 12px;
            }

            .section-title {
                font-size: 20px;
            }

            .tabs {
                gap: 10px;
                margin: 20px auto;
                overflow-x: auto;
                padding-bottom: 10px;
            }

            .tab {
                padding: 10px 0;
                white-space: nowrap;
                font-size: 14px;
            }

            .module-header {
                padding: 15px;
            }

            .module-title {
                gap: 10px;
                font-size: 14px;
            }

            .details-card {
                padding: 20px;
            }
        }