/* Reset and base styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

:root {
    /* Light theme colors */
    --bg-primary: #ffffff;
    --bg-secondary: #f8f9fa;
    --bg-card: #ffffff;
    --text-primary: #2d3748;
    --text-secondary: #4a5568;
    --text-muted: #718096;
    --accent-primary: #3182ce;
    --accent-secondary: #2c5aa0;
    --accent-light: #e6f3ff;
    --border-color: #e2e8f0;
    --shadow-light: rgba(0, 0, 0, 0.1);
    --shadow-medium: rgba(0, 0, 0, 0.15);
    --highlight: #3182ce;
    --success: #48bb78;
    --warning: #ed8936;
}

[data-theme="dark"] {
    /* Dark theme colors */
    --bg-primary: #1a202c;
    --bg-secondary: #2d3748;
    --bg-card: #2d3748;
    --text-primary: #f7fafc;
    --text-secondary: #e2e8f0;
    --text-muted: #a0aec0;
    --accent-primary: #63b3ed;
    --accent-secondary: #4299e1;
    --accent-light: #1a365d;
    --border-color: #4a5568;
    --shadow-light: rgba(0, 0, 0, 0.3);
    --shadow-medium: rgba(0, 0, 0, 0.4);
    --highlight: #63b3ed;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen', 'Ubuntu', 'Cantarell', sans-serif;
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--bg-primary);
    transition: background-color 0.3s ease, color 0.3s ease;
}

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

/* Navigation */
.navbar {
    position: fixed;
    top: 0;
    width: 100%;
    background: var(--bg-primary);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-color);
    z-index: 1000;
    transition: all 0.3s ease;
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 20px;
}

.nav-logo h2 {
    color: var(--accent-primary);
    font-weight: 700;
    font-size: 1.5rem;
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: 2rem;
}

.nav-link {
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.3s ease;
    position: relative;
}

.nav-link:hover {
    color: var(--accent-primary);
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--accent-primary);
    transition: width 0.3s ease;
}

.nav-link:hover::after {
    width: 100%;
}

.theme-toggle {
    background: none;
    border: 2px solid var(--border-color);
    border-radius: 50%;
    width: 40px;
    height: 40px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s ease;
    font-size: 1.2rem;
}

.theme-toggle:hover {
    border-color: var(--accent-primary);
    transform: scale(1.1);
}

/* Hero Section */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    background: linear-gradient(135deg, var(--bg-primary) 0%, var(--bg-secondary) 100%);
    padding-top: 80px;
}

.hero-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
}

.hero-title {
    font-size: 3.5rem;
    font-weight: 800;
    line-height: 1.2;
    margin-bottom: 1.5rem;
    animation: fadeInUp 0.8s ease both;
}

.highlight {
    color: var(--accent-primary);
    position: relative;
}

.highlight::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 3px;
    background: linear-gradient(90deg, var(--accent-primary), var(--accent-secondary));
    animation: slideIn 1s ease 0.5s both;
}

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--text-secondary);
    margin-bottom: 2rem;
    animation: fadeInUp 0.8s ease 0.2s both;
}

.hero-buttons {
    display: flex;
    gap: 1rem;
    animation: fadeInUp 0.8s ease 0.4s both;
}

.btn {
    padding: 12px 32px;
    border-radius: 8px;
    text-decoration: none;
    font-weight: 600;
    font-size: 1rem;
    transition: all 0.3s ease;
    display: inline-block;
    text-align: center;
    border: none;
    cursor: pointer;
}

.btn-primary {
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    color: white;
    box-shadow: 0 4px 15px var(--shadow-light);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px var(--shadow-medium);
}

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

.btn-secondary:hover {
    background: var(--accent-primary);
    color: white;
    transform: translateY(-2px);
}

.btn-outline {
    background: transparent;
    color: var(--text-primary);
    border: 2px solid var(--border-color);
}

.btn-outline:hover:not(.disabled) {
    background: var(--accent-primary);
    color: white;
    border-color: var(--accent-primary);
}

.btn.disabled {
    opacity: 0.6;
    cursor: not-allowed;
    pointer-events: none;
}

.hero-image {
    display: flex;
    justify-content: center;
    align-items: center;
    animation: fadeInUp 0.8s ease 0.6s both;
}

.hero-placeholder {
    width: 300px;
    height: 300px;
    background: var(--bg-card);
    border-radius: 20px;
    box-shadow: 0 20px 40px var(--shadow-light);
    display: flex;
    align-items: center;
    justify-content: center;
    border: 1px solid var(--border-color);
}

.password-visual {
    text-align: center;
}

.password-field {
    background: var(--bg-secondary);
    padding: 20px 30px;
    border-radius: 12px;
    border: 2px solid var(--border-color);
    display: flex;
    align-items: center;
    gap: 15px;
    animation: pulse 2s infinite;
}

.password-dots {
    font-size: 1.5rem;
    color: var(--text-secondary);
    letter-spacing: 3px;
}

.lock-icon {
    font-size: 1.5rem;
    animation: bounce 2s infinite;
}

/* Sections */
section {
    padding: 80px 0;
}

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

.section-subtitle {
    font-size: 1.125rem;
    color: var(--text-secondary);
    text-align: center;
    margin-bottom: 3rem;
}

/* Features Section */
.features {
    background: var(--bg-secondary);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 2rem;
    margin-top: 3rem;
}

.feature-card {
    background: var(--bg-card);
    padding: 2rem;
    border-radius: 16px;
    text-align: center;
    box-shadow: 0 8px 25px var(--shadow-light);
    border: 1px solid var(--border-color);
    transition: all 0.3s ease;
    animation: slideInUp 0.6s ease;
}

.feature-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 20px 40px var(--shadow-medium);
}

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

.feature-card h3 {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.feature-card p {
    color: var(--text-secondary);
    line-height: 1.6;
}

/* Download Section */
.download-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-top: 3rem;
}

.download-card {
    background: var(--bg-card);
    padding: 2.5rem 2rem;
    border-radius: 16px;
    text-align: center;
    box-shadow: 0 8px 25px var(--shadow-light);
    border: 1px solid var(--border-color);
    transition: all 0.3s ease;
}

.download-card:hover {
    transform: translateY(-5px);
}

.download-icon {
    font-size: 4rem;
    margin-bottom: 1.5rem;
    display: block;
}

.download-card h3 {
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.download-card p {
    color: var(--text-secondary);
    margin-bottom: 2rem;
}

.trademark-notice {
    text-align: center;
    color: var(--text-muted);
    font-size: 0.85rem;
    margin-top: 2rem;
    font-style: italic;
}

/* FAQ Section */
.faq {
    background: var(--bg-secondary);
}

.faq-grid {
    max-width: 800px;
    margin: 0 auto;
}

.faq-item {
    background: var(--bg-card);
    border-radius: 12px;
    margin-bottom: 1rem;
    box-shadow: 0 4px 15px var(--shadow-light);
    border: 1px solid var(--border-color);
    overflow: hidden;
    transition: all 0.3s ease;
}

.faq-question {
    padding: 1.5rem 2rem;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: var(--bg-card);
    transition: background-color 0.3s ease;
}

.faq-question:hover {
    background: var(--accent-light);
}

.faq-question h3 {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--text-primary);
}

.faq-toggle {
    font-size: 1.5rem;
    font-weight: 300;
    color: var(--accent-primary);
    transition: transform 0.3s ease;
}

.faq-item.active .faq-toggle {
    transform: rotate(45deg);
}

.faq-answer {
    padding: 0 2rem;
    max-height: 0;
    overflow: hidden;
    transition: all 0.3s ease;
}

.faq-item.active .faq-answer {
    padding: 0 2rem 1.5rem;
    max-height: 200px;
}

.faq-answer p {
    color: var(--text-secondary);
    line-height: 1.6;
}

/* Privacy Section */
.privacy-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
    margin-top: 3rem;
}

.privacy-card {
    background: var(--bg-card);
    padding: 2rem;
    border-radius: 16px;
    text-align: center;
    box-shadow: 0 8px 25px var(--shadow-light);
    border: 1px solid var(--border-color);
    transition: all 0.3s ease;
}

.privacy-card:hover {
    transform: translateY(-5px);
}

.privacy-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
    display: block;
}

.privacy-card h3 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.privacy-card p {
    color: var(--text-secondary);
    line-height: 1.6;
}

/* Footer */
.footer {
    background: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
    padding: 3rem 0 1rem;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-bottom: 2rem;
}

.footer-section h3 {
    color: var(--text-primary);
    margin-bottom: 1rem;
}

.footer-section h4 {
    color: var(--text-primary);
    margin-bottom: 1rem;
    font-size: 1.125rem;
}

.footer-section p {
    color: var(--text-secondary);
    margin-bottom: 1rem;
}

.footer-section ul {
    list-style: none;
}

.footer-section ul li {
    margin-bottom: 0.5rem;
}

.footer-section ul li a {
    color: var(--text-secondary);
    text-decoration: none;
    transition: color 0.3s ease;
}

.footer-section ul li a:hover {
    color: var(--accent-primary);
}

.contact-email {
    color: var(--accent-primary);
    text-decoration: none;
    font-weight: 600;
    transition: color 0.3s ease;
}

.contact-email:hover {
    color: var(--accent-secondary);
}

.footer-bottom {
    text-align: center;
    padding-top: 2rem;
    border-top: 1px solid var(--border-color);
    color: var(--text-muted);
}

/* Animations */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes slideIn {
    from {
        width: 0;
    }
    to {
        width: 100%;
    }
}

@keyframes slideInUp {
    from {
        opacity: 0;
        transform: translateY(50px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes pulse {
    0%, 100% {
        transform: scale(1);
    }
    50% {
        transform: scale(1.05);
    }
}

@keyframes bounce {
    0%, 20%, 50%, 80%, 100% {
        transform: translateY(0);
    }
    40% {
        transform: translateY(-10px);
    }
    60% {
        transform: translateY(-5px);
    }
}

/* Responsive Design */
@media (max-width: 768px) {
    .nav-menu {
        gap: 1rem;
    }
    
    .nav-link {
        font-size: 0.9rem;
    }
    
    .hero-container {
        grid-template-columns: 1fr;
        gap: 2rem;
        text-align: center;
    }
    
    .hero-title {
        font-size: 2.5rem;
    }
    
    .hero-buttons {
        justify-content: center;
        flex-wrap: wrap;
    }
    
    .hero-placeholder {
        width: 250px;
        height: 250px;
    }
    
    .features-grid {
        grid-template-columns: 1fr;
    }
    
    .download-grid {
        grid-template-columns: 1fr;
    }
    
    .privacy-grid {
        grid-template-columns: 1fr;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .section-title {
        font-size: 2rem;
    }
    
    .container {
        padding: 0 15px;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 2rem;
    }
    
    .hero-subtitle {
        font-size: 1rem;
    }
    
    .nav-container {
        padding: 0.75rem 15px;
    }
    
    .nav-menu {
        gap: 0.5rem;
    }
    
    .nav-link {
        font-size: 0.8rem;
    }
    
    .theme-toggle {
        width: 35px;
        height: 35px;
        font-size: 1rem;
    }
    
    .btn {
        padding: 10px 24px;
        font-size: 0.9rem;
    }
    
    .hero-placeholder {
        width: 200px;
        height: 200px;
    }
    
    .password-field {
        padding: 15px 20px;
    }
    
    .password-dots {
        font-size: 1.2rem;
    }
}

/* Scroll animations */
.animate-on-scroll {
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.6s ease;
}

.animate-on-scroll.animated {
    opacity: 1;
    transform: translateY(0);
}

/* Focus styles for accessibility */
.btn:focus,
.nav-link:focus,
.theme-toggle:focus,
.faq-question:focus {
    outline: 2px solid var(--accent-primary);
    outline-offset: 2px;
}