:root {
            --primary: #E63946; 
            --secondary: #FFB703; 
            --accent: #2A9D8F; 
            --text-dark: #264653; 
            --text-light: #F8F9FA; 
            --bg-light: #F9F7F3; 
            --bg-dark: #1D3557; 
            --shadow: 0 4px 12px rgba(0,0,0,0.15);
            --transition: all 0.3s ease-in-out;
        }
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
        }
        body {
            line-height: 1.8;
            color: var(--text-dark);
            background-color: var(--bg-light);
            padding-bottom: 6rem;
            word-spacing: 0.05em;
            letter-spacing: -0.01em;
        }
        header {
            background-color: var(--bg-dark);
            color: var(--text-light);
            padding: 1.2rem 2rem;
            position: sticky;
            top: 0;
            z-index: 1000;
            box-shadow: var(--shadow);
        }
        .nav-container {
            max-width: 1400px;
            margin: 0 auto;
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        .logo {
            font-size: 2.1rem;
            font-weight: 800;
            text-transform: uppercase;
            letter-spacing: 0.7px;
            background: linear-gradient(90deg, var(--secondary), var(--primary));
            -webkit-background-clip: text;
            background-clip: text;
            color: transparent;
            display: flex;
            align-items: center;
        }
        .logo span {
            font-size: 2.3rem;
            font-weight: 900;
            margin: 0 0.3rem;
        }
        .nav-links {
            display: flex;
            gap: 2.5rem;
            align-items: center;
        }
        .nav-links a {
            color: var(--text-light);
            text-decoration: none;
            font-weight: 500;
            font-size: 1.05rem;
            transition: var(--transition);
            position: relative;
        }
        .nav-links a::after {
            content: '';
            position: absolute;
            bottom: -5px;
            left: 0;
            width: 0;
            height: 2px;
            background-color: var(--primary);
            transition: var(--transition);
        }
        .nav-links a:hover {
            color: var(--secondary);
        }
        .nav-links a:hover::after {
            width: 100%;
        }
        .btn {
            padding: 0.8rem 1.8rem;
            border: none;
            border-radius: 6px;
            font-weight: 600;
            cursor: pointer;
            transition: var(--transition);
            text-decoration: none;
            display: inline-block;
            font-size: 1.05rem;
            text-align: center;
        }
        .btn-download {
            background-color: var(--primary);
            color: var(--text-light);
            margin-right: 1rem;
        }
        .btn-download:hover {
            background-color: #c1121f;
            transform: translateY(-3px);
            box-shadow: 0 6px 12px rgba(230, 57, 70, 0.3);
        }
        .btn-login {
            background-color: var(--secondary);
            color: var(--bg-dark);
        }
        .btn-login:hover {
            background-color: #e6a800;
            transform: translateY(-3px);
            box-shadow: 0 6px 12px rgba(255, 183, 3, 0.3);
        }
        .hamburger {
            display: none;
            font-size: 1.8rem;
            cursor: pointer;
            color: var(--secondary);
        }
        .container {
            max-width: 1300px;
            margin: 3rem auto;
            padding: 0 2rem;
        }
        .intro-section {
            background-color: white;
            border-radius: 12px;
            padding: 3rem;
            margin-bottom: 4rem;
            box-shadow: var(--shadow);
            border-top: 5px solid var(--primary);
        }
        .intro-section h1 {
            font-size: 3.1rem;
            color: var(--accent);
            margin-bottom: 2rem;
            text-align: center;
            line-height: 1.3;
        }
        .intro-section .subtitle {
            font-size: 1.25rem;
            color: var(--text-dark);
            text-align: center;
            margin-bottom: 2.5rem;
            font-style: italic;
            max-width: 950px;
            margin-left: auto;
            margin-right: auto;
        }
        .intro-img {
            width: 100%;
            height: 480px;
            object-fit: cover;
            border-radius: 8px;
            margin: 2.5rem 0;
            box-shadow: 0 6px 16px rgba(0,0,0,0.1);
        }
        .intro-content p {
            font-size: 1.18rem;
            margin-bottom: 2rem;
            text-align: justify;
            line-height: 1.9;
        }
        .intro-content strong {
            color: var(--primary);
            font-weight: 600;
        }
        .key-info {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
            gap: 1.8rem;
            margin: 3.5rem 0;
            background-color: var(--bg-light);
            padding: 2.2rem;
            border-radius: 8px;
        }
        .info-card {
            background-color: white;
            padding: 1.8rem;
            border-radius: 8px;
            box-shadow: var(--shadow);
            border-left: 4px solid var(--accent);
            transition: var(--transition);
        }
        .info-card:hover {
            transform: translateX(5px);
            box-shadow: 0 6px 14px rgba(0,0,0,0.12);
        }
        .info-card h4 {
            font-size: 1.25rem;
            color: var(--accent);
            margin-bottom: 1.2rem;
            display: flex;
            align-items: center;
        }
        .info-card h4 svg {
            margin-right: 0.8rem;
        }
        .info-card p {
            font-size: 1.08rem;
            color: var(--text-dark);
        }
        section {
            background-color: white;
            border-radius: 12px;
            padding: 3rem;
            margin-bottom: 4rem;
            box-shadow: var(--shadow);
        }
        section h2 {
            font-size: 2.5rem;
            color: var(--accent);
            margin-bottom: 2.8rem;
            padding-bottom: 1.2rem;
            border-bottom: 3px solid var(--secondary);
            display: flex;
            align-items: center;
        }
        section h2 span {
            margin-right: 1.2rem;
            color: var(--primary);
        }
        section h3 {
            font-size: 1.85rem;
            color: var(--text-dark);
            margin: 2.8rem 0 1.8rem;
            color: var(--accent);
            display: flex;
            align-items: center;
        }
        section h3::before {
            content: '🔥';
            margin-right: 1rem;
        }
        section h4 {
            font-size: 1.45rem;
            color: var(--primary);
            margin: 2.2rem 0 1.2rem;
        }
        section p {
            font-size: 1.12rem;
            margin-bottom: 2rem;
            text-align: justify;
            line-height: 1.85;
        }
        section ul {
            margin-left: 2.8rem;
            margin-bottom: 2.2rem;
        }
        section li {
            font-size: 1.1rem;
            margin-bottom: 1.4rem;
            line-height: 1.8;
        }
        .section-img {
            width: 100%;
            height: 400px;
            object-fit: cover;
            border-radius: 8px;
            margin: 2.5rem 0;
            box-shadow: 0 6px 16px rgba(0,0,0,0.1);
        }
        .grid-layout {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(340px, 1fr));
            gap: 2.8rem;
            margin: 3.5rem 0;
        }
        .grid-card {
            background-color: var(--bg-light);
            border-radius: 10px;
            padding: 2.2rem;
            box-shadow: var(--shadow);
            transition: var(--transition);
            border-top: 4px solid var(--primary);
            position: relative;
            overflow: hidden;
        }
        .grid-card::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 4px;
            background: linear-gradient(90deg, var(--primary), var(--secondary));
        }
        .grid-card:hover {
            transform: translateY(-7px);
            box-shadow: 0 12px 20px rgba(0,0,0,0.15);
        }
        .grid-card h4 {
            font-size: 1.45rem;
            color: var(--accent);
            margin-bottom: 1.5rem;
            text-align: center;
            padding-bottom: 0.8rem;
            border-bottom: 1px solid rgba(0,0,0,0.08);
        }
        .testimonial-container {
            background-color: var(--bg-light);
            border-radius: 10px;
            padding: 2.8rem;
            margin: 3.5rem 0;
            border-left: 5px solid var(--primary);
            position: relative;
        }
        .testimonial-container::after {
            content: '"';
            position: absolute;
            bottom: -20px;
            right: 20px;
            font-size: 6rem;
            color: var(--primary);
            opacity: 0.1;
            font-family: Georgia, serif;
        }
        .testimonial {
            font-style: italic;
            font-size: 1.2rem;
            color: var(--text-dark);
            margin-bottom: 1.8rem;
            line-height: 1.95;
        }
        .testimonial-author {
            font-weight: 600;
            color: var(--accent);
            font-size: 1.15rem;
            text-align: right;
            display: flex;
            align-items: center;
            justify-content: flex-end;
        }
        .testimonial-author::before {
            content: '—';
            margin-right: 0.8rem;
            color: var(--primary);
        }
        .timeline {
            position: relative;
            max-width: 1200px;
            margin: 4rem auto;
        }
        .timeline::after {
            content: '';
            position: absolute;
            width: 6px;
            background-color: var(--secondary);
            top: 0;
            bottom: 0;
            left: 50%;
            margin-left: -3px;
        }
        .timeline-item {
            padding: 10px 40px;
            position: relative;
            background-color: inherit;
            width: 50%;
        }
        .timeline-item::after {
            content: '';
            position: absolute;
            width: 28px;
            height: 28px;
            right: -17px;
            background-color: white;
            border: 4px solid var(--primary);
            top: 15px;
            border-radius: 50%;
            z-index: 1;
        }
        .left {
            left: 0;
        }
        .right {
            left: 50%;
        }
        .left::before {
            content: " ";
            height: 0;
            position: absolute;
            top: 22px;
            width: 0;
            z-index: 1;
            right: 30px;
            border: medium solid var(--primary);
            border-width: 10px 0 10px 10px;
            border-color: transparent transparent transparent var(--primary);
        }
        .right::before {
            content: " ";
            height: 0;
            position: absolute;
            top: 22px;
            width: 0;
            z-index: 1;
            left: 30px;
            border: medium solid var(--primary);
            border-width: 10px 10px 10px 0;
            border-color: transparent var(--primary) transparent transparent;
        }
        .right::after {
            left: -16px;
        }
        .timeline-content {
            padding: 2.2rem;
            background-color: white;
            position: relative;
            border-radius: 8px;
            box-shadow: var(--shadow);
            transition: var(--transition);
        }
        .timeline-content:hover {
            transform: scale(1.02);
            box-shadow: 0 8px 16px rgba(0,0,0,0.12);
        }
        .timeline-content h4 {
            color: var(--accent);
            margin-bottom: 1.2rem;
            font-size: 1.35rem;
        }
        .timeline-content p {
            font-size: 1.08rem;
            line-height: 1.75;
        }
        .bottom-section {
            background-color: var(--bg-dark);
            color: var(--text-light);
            padding: 4.5rem 2rem;
            border-radius: 12px;
            box-shadow: var(--shadow);
            margin-top: 5rem;
        }
        .bottom-container {
            max-width: 1300px;
            margin: 0 auto;
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
            gap: 3.5rem;
        }
        .category-section h3,
        .tags-section h3,
        .recommendation-section h3 {
            font-size: 1.7rem;
            color: var(--secondary);
            margin-bottom: 1.8rem;
            padding-bottom: 1rem;
            border-bottom: 2px solid rgba(255, 183, 3, 0.3);
        }
        .category-links {
            display: flex;
            flex-wrap: wrap;
            gap: 1.2rem;
        }
        .category-links a {
            color: var(--text-light);
            background-color: rgba(230, 57, 70, 0.2);
            padding: 0.8rem 1.4rem;
            border-radius: 25px;
            text-decoration: none;
            transition: var(--transition);
            font-size: 1.08rem;
        }
        .category-links a:hover {
            background-color: var(--primary);
            transform: translateY(-2px);
        }
        .tags-links {
            display: flex;
            flex-wrap: wrap;
            gap: 1rem;
        }
        .tags-links a {
            color: var(--bg-dark);
            background-color: var(--secondary);
            padding: 0.7rem 1.2rem;
            border-radius: 25px;
            text-decoration: none;
            font-size: 1rem;
            transition: var(--transition);
        }
        .tags-links a:hover {
            background-color: #e6a800;
            transform: translateY(-2px);
        }
        .recommendation-content {
            background-color: rgba(255, 255, 255, 0.05);
            padding: 2.2rem;
            border-radius: 8px;
            border: 1px solid rgba(255, 255, 255, 0.1);
        }
        .recommendation-content p {
            font-size: 1.1rem;
            margin-bottom: 1.8rem;
            line-height: 1.85;
        }
        .recommendation-content strong {
            color: var(--secondary);
        }
        .recommendation-btn {
            display: inline-block;
            background-color: var(--secondary);
            color: var(--bg-dark);
            padding: 0.9rem 1.8rem;
            border-radius: 6px;
            font-weight: 600;
            text-decoration: none;
            transition: var(--transition);
        }
        .recommendation-btn:hover {
            background-color: #e6a800;
            transform: translateY(-3px);
            box-shadow: 0 6px 12px rgba(255, 183, 3, 0.3);
        }
        .copyright {
            text-align: center;
            padding-top: 3.5rem;
            margin-top: 3.5rem;
            border-top: 1px solid rgba(255, 255, 255, 0.1);
            font-size: 1.05rem;
            color: #ccc;
            line-height: 1.8;
        }
        .copyright a {
            color: var(--secondary);
            text-decoration: none;
            transition: var(--transition);
        }
        .copyright a:hover {
            color: var(--primary);
            text-decoration: underline;
        }
        @media (max-width: 1024px) {
            .timeline::after {
                left: 31px;
            }
            .timeline-item {
                width: 100%;
                padding-left: 70px;
                padding-right: 25px;
            }
            .timeline-item::before {
                left: 60px;
                border: medium solid var(--primary);
                border-width: 10px 10px 10px 0;
                border-color: transparent var(--primary) transparent transparent;
            }
            .left::after, .right::after {
                left: 15px;
            }
            .right {
                left: 0%;
            }
            .intro-section h1 {
                font-size: 2.6rem;
            }
            section h2 {
                font-size: 2.2rem;
            }
            section h3 {
                font-size: 1.7rem;
            }
        }
        @media (max-width: 768px) {
            .nav-links {
                display: none;
                flex-direction: column;
                position: absolute;
                top: 80px;
                left: 0;
                right: 0;
                background-color: var(--bg-dark);
                padding: 2.5rem;
                gap: 2rem;
                box-shadow: 0 10px 20px rgba(0,0,0,0.2);
            }
            .nav-links.active {
                display: flex;
            }
            .hamburger {
                display: block;
            }
            .btn-container {
                display: flex;
                flex-direction: column;
                gap: 1.5rem;
                width: 100%;
            }
            .btn-download {
                margin-right: 0;
                width: 100%;
            }
            .btn-login {
                width: 100%;
            }
            .intro-section {
                padding: 2.2rem;
            }
            .intro-section h1 {
                font-size: 2.3rem;
            }
            .intro-img, .section-img {
                height: 300px;
            }
            section {
                padding: 2.2rem;
            }
            section h2 {
                font-size: 2rem;
            }
            section h3 {
                font-size: 1.6rem;
            }
            .grid-layout {
                grid-template-columns: 1fr;
            }
            .key-info {
                grid-template-columns: 1fr;
            }
        }
        @media (max-width: 480px) {
            .logo {
                font-size: 1.8rem;
            }
            .logo span {
                font-size: 2rem;
            }
            .intro-section {
                padding: 1.8rem;
            }
            .intro-section h1 {
                font-size: 2rem;
            }
            .intro-section .subtitle {
                font-size: 1.1rem;
            }
            .intro-img, .section-img {
                height: 240px;
            }
            section {
                padding: 1.8rem;
            }
            section h2 {
                font-size: 1.8rem;
            }
            section h3 {
                font-size: 1.5rem;
            }
            .bottom-section {
                padding: 3rem 1.8rem;
            }
            .bottom-container {
                gap: 2.5rem;
            }
        }
        .text-highlight {
            background-color: rgba(255, 183, 3, 0.2);
            padding: 0.3rem 0.6rem;
            border-radius: 4px;
            font-weight: 500;
        }
        .callout {
            background-color: rgba(230, 57, 70, 0.1);
            padding: 1.8rem;
            border-radius: 8px;
            margin: 3rem 0;
            border-left: 4px solid var(--primary);
        }
        .callout p {
            margin-bottom: 0;
            font-weight: 500;
            font-size: 1.12rem;
        }
        .spacing {
            margin: 2.5rem 0;
        }
        .quote-mark {
            font-size: 3rem;
            color: var(--primary);
            opacity: 0.3;
            position: relative;
            top: 1rem;
            font-family: Georgia, serif;
        }