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

:root {
    --primary-color: #6366f1;
    --primary-dark: #4f46e5;
    --secondary-color: #8b5cf6;
    --text-dark: #1f2937;
    --text-light: #6b7280;
    --bg-light: #f9fafb;
    --white: #ffffff;
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    color: var(--text-dark);
    line-height: 1.6;
    overflow-x: hidden;
}

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

@media (max-width: 768px) {
    .container {
        padding: 0 16px;
    }
}

/* Navbar */
.navbar {
    background: var(--white);
    box-shadow: var(--shadow);
    position: sticky;
    top: 0;
    z-index: 1000;
    padding: 1rem 0;
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo h1 {
    font-size: 1.5rem;
    color: var(--primary-color);
    font-weight: 700;
}

.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0.5rem;
    gap: 5px;
    z-index: 1001;
}

.mobile-menu-toggle span {
    width: 25px;
    height: 3px;
    background: var(--primary-color);
    border-radius: 3px;
    transition: all 0.3s ease;
}

.mobile-menu-toggle.active span:nth-child(1) {
    transform: rotate(45deg) translate(8px, 8px);
}

.mobile-menu-toggle.active span:nth-child(2) {
    opacity: 0;
}

.mobile-menu-toggle.active span:nth-child(3) {
    transform: rotate(-45deg) translate(7px, -7px);
}

.nav-links {
    display: flex;
    list-style: none;
    gap: 2rem;
}

.nav-links a {
    text-decoration: none;
    color: var(--text-dark);
    font-weight: 500;
    transition: color 0.3s ease;
    padding: 0.5rem 0;
    display: block;
}

.nav-links a:hover {
    color: var(--primary-color);
}

/* Hero Section */
.hero {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: var(--white);
    padding: 6rem 0;
    min-height: 80vh;
    display: flex;
    align-items: center;
}

.hero .container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
    align-items: center;
}

.hero-content h2 {
    font-size: 3rem;
    font-weight: 700;
    margin-bottom: 1.5rem;
    line-height: 1.2;
}

.hero-content p {
    font-size: 1.25rem;
    margin-bottom: 2rem;
    opacity: 0.95;
}

@media (max-width: 768px) {
    .hero {
        padding: 4rem 0;
        min-height: auto;
    }
    
    .hero-content h2 {
        font-size: 2rem;
        margin-bottom: 1rem;
    }
    
    .hero-content p {
        font-size: 1rem;
        margin-bottom: 1.5rem;
    }
}

.btn-primary {
    display: inline-block;
    background: var(--white);
    color: var(--primary-color);
    padding: 1rem 2.5rem;
    border-radius: 50px;
    text-decoration: none;
    font-weight: 600;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    box-shadow: var(--shadow-lg);
    text-align: center;
    min-width: 200px;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
}

.btn-primary:active {
    transform: translateY(0);
}

@media (max-width: 768px) {
    .btn-primary {
        padding: 0.875rem 2rem;
        font-size: 0.95rem;
        min-width: auto;
        width: 100%;
        max-width: 300px;
    }
}

.hero-image {
    display: flex;
    justify-content: center;
    align-items: center;
}

.computer-icon {
    font-size: 15rem;
    opacity: 0.9;
    animation: float 3s ease-in-out infinite;
}

@media (max-width: 768px) {
    .computer-icon {
        font-size: 6rem;
        margin-top: 2rem;
    }
}

@keyframes float {
    0%, 100% {
        transform: translateY(0px);
    }
    50% {
        transform: translateY(-20px);
    }
}

/* Features Section */
.features {
    padding: 5rem 0;
    background: var(--bg-light);
}

.section-title {
    text-align: center;
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 3rem;
    color: var(--text-dark);
    padding: 0 1rem;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

@media (max-width: 768px) {
    .features {
        padding: 3rem 0;
    }
    
    .section-title {
        font-size: 1.75rem;
        margin-bottom: 2rem;
    }
    
    .features-grid {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }
}

.feature-card {
    background: var(--white);
    padding: 2rem;
    border-radius: 12px;
    box-shadow: var(--shadow);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    text-align: center;
}

.feature-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

@media (max-width: 768px) {
    .feature-card {
        padding: 1.5rem;
    }
    
    .feature-card:hover {
        transform: none;
    }
}

.feature-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.feature-card h3 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    color: var(--primary-color);
}

.feature-card p {
    color: var(--text-light);
    line-height: 1.8;
}

/* Download Section */
.download {
    padding: 5rem 0;
    background: var(--white);
}

.download-description {
    text-align: center;
    font-size: 1.25rem;
    color: var(--text-light);
    margin-bottom: 3rem;
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
    padding: 0 1rem;
}

@media (max-width: 768px) {
    .download {
        padding: 3rem 0;
    }
    
    .download-description {
        font-size: 1rem;
        margin-bottom: 2rem;
    }
}

.download-card {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border-radius: 20px;
    padding: 3rem;
    color: var(--white);
    box-shadow: var(--shadow-lg);
    max-width: 800px;
    margin: 0 auto;
}

.app-info {
    display: flex;
    align-items: center;
    gap: 2rem;
    margin-bottom: 2rem;
    padding-bottom: 2rem;
    border-bottom: 1px solid rgba(255, 255, 255, 0.2);
}

.app-icon {
    font-size: 5rem;
    background: rgba(255, 255, 255, 0.2);
    width: 100px;
    height: 100px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 20px;
    flex-shrink: 0;
}

.app-details h3 {
    font-size: 2rem;
    margin-bottom: 0.5rem;
}

@media (max-width: 768px) {
    .download-card {
        padding: 2rem 1.5rem;
        border-radius: 16px;
        margin: 0 1rem;
    }
    
    .app-info {
        flex-direction: column;
        text-align: center;
        gap: 1.5rem;
        padding-bottom: 1.5rem;
    }
    
    .app-icon {
        width: 80px;
        height: 80px;
        font-size: 4rem;
    }
    
    .app-details h3 {
        font-size: 1.5rem;
    }
    
    .app-version,
    .app-size {
        font-size: 0.9rem;
    }
}

.app-version,
.app-size {
    opacity: 0.9;
    margin: 0.25rem 0;
}

.download-buttons {
    text-align: center;
}

.btn-download {
    display: inline-block;
    background: var(--white);
    color: var(--primary-color);
    padding: 1.25rem 3rem;
    border-radius: 50px;
    text-decoration: none;
    font-weight: 700;
    font-size: 1.1rem;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    box-shadow: var(--shadow-lg);
    margin-bottom: 1rem;
    width: 100%;
    max-width: 300px;
}

.btn-download:hover {
    transform: translateY(-3px);
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
}

.btn-download:active {
    transform: translateY(0);
}

.btn-download span {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

@media (max-width: 768px) {
    .btn-download {
        padding: 1rem 2rem;
        font-size: 1rem;
        max-width: 100%;
    }
}

.download-note {
    font-size: 0.9rem;
    opacity: 0.8;
    margin-top: 1rem;
    line-height: 1.6;
}

@media (max-width: 768px) {
    .download-note {
        font-size: 0.85rem;
        padding: 0 0.5rem;
    }
}

.install-instructions {
    margin-top: 3rem;
    background: var(--bg-light);
    padding: 2rem;
    border-radius: 12px;
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
}

.install-instructions h3 {
    color: var(--primary-color);
    margin-bottom: 1.5rem;
    font-size: 1.5rem;
}

.install-instructions ol {
    margin-left: 1.5rem;
    color: var(--text-dark);
}

.install-instructions li {
    margin: 0.75rem 0;
    line-height: 1.8;
}

@media (max-width: 768px) {
    .install-instructions {
        margin-top: 2rem;
        padding: 1.5rem;
        margin-left: 1rem;
        margin-right: 1rem;
    }
    
    .install-instructions h3 {
        font-size: 1.25rem;
        margin-bottom: 1rem;
    }
    
    .install-instructions ol {
        margin-left: 1.25rem;
    }
    
    .install-instructions li {
        margin: 0.5rem 0;
        font-size: 0.95rem;
    }
}

/* About Section */
.about {
    padding: 5rem 0;
    background: var(--bg-light);
}

.about-content {
    max-width: 800px;
    margin: 0 auto;
    text-align: center;
    padding: 0 1rem;
}

.about-content p {
    font-size: 1.1rem;
    color: var(--text-light);
    margin-bottom: 1.5rem;
    line-height: 1.8;
}

@media (max-width: 768px) {
    .about {
        padding: 3rem 0;
    }
    
    .about-content p {
        font-size: 1rem;
        margin-bottom: 1.25rem;
    }
}

/* Footer */
footer {
    background: var(--text-dark);
    color: var(--white);
    padding: 2rem 0;
    text-align: center;
}

footer p {
    margin: 0.5rem 0;
    opacity: 0.8;
    padding: 0 1rem;
    font-size: 0.9rem;
}

@media (max-width: 768px) {
    footer {
        padding: 1.5rem 0;
    }
    
    footer p {
        font-size: 0.85rem;
    }
}

/* Responsive Design */
@media (max-width: 768px) {
    .mobile-menu-toggle {
        display: flex;
    }
    
    .nav-links {
        position: fixed;
        top: 0;
        right: -100%;
        width: 80%;
        max-width: 300px;
        height: 100vh;
        background: var(--white);
        flex-direction: column;
        gap: 0;
        padding: 5rem 2rem 2rem;
        box-shadow: -5px 0 15px rgba(0, 0, 0, 0.1);
        transition: right 0.3s ease;
        z-index: 1000;
    }
    
    .nav-links.active {
        right: 0;
    }
    
    .nav-links li {
        width: 100%;
        border-bottom: 1px solid rgba(0, 0, 0, 0.1);
    }
    
    .nav-links a {
        padding: 1rem 0;
        font-size: 1.1rem;
    }

    .hero .container {
        grid-template-columns: 1fr;
        text-align: center;
        gap: 2rem;
    }
}

@media (max-width: 480px) {
    .logo h1 {
        font-size: 1.25rem;
    }
    
    .hero {
        padding: 3rem 0;
        min-height: auto;
    }

    .hero-content h2 {
        font-size: 1.75rem;
        line-height: 1.3;
    }
    
    .hero-content p {
        font-size: 0.95rem;
    }

    .btn-primary {
        padding: 0.875rem 1.5rem;
        font-size: 0.95rem;
    }
    
    .section-title {
        font-size: 1.5rem;
    }
    
    .feature-card h3 {
        font-size: 1.25rem;
    }
    
    .feature-icon {
        font-size: 2.5rem;
    }
    
    .download-card {
        padding: 1.5rem 1rem;
    }
    
    .app-details h3 {
        font-size: 1.25rem;
    }
}