/* CSS Custom Properties */
:root {
    --color-primary: #6366f1;
    --color-primary-dark: #4f46e5;
    --color-primary-light: #818cf8;
    --color-secondary: #8b5cf6;
    --color-accent: #ec4899;
    --color-text: #1f2937;
    --color-text-light: #6b7280;
    --color-bg: #ffffff;
    --color-bg-light: #f9fafb;
    --color-bg-dark: #111827;
    --color-border: #e5e7eb;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-2xl: 4rem;
    --transition: all 0.3s ease;
}

/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

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

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

/* Header Styles */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background-color: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow-sm);
    z-index: 1000;
    transition: var(--transition);
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-sm) 0;
}

.logo a {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-primary);
    text-decoration: none;
    transition: var(--transition);
}

.logo a:hover {
    color: var(--color-primary-dark);
}

.nav-list {
    display: flex;
    list-style: none;
    gap: var(--spacing-md);
    align-items: center;
}

.nav-link {
    color: var(--color-text);
    text-decoration: none;
    font-weight: 500;
    transition: var(--transition);
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-md);
}

.nav-link:hover {
    color: var(--color-primary);
    background-color: var(--color-bg-light);
}

.btn-download-header {
    background-color: var(--color-primary);
    color: white !important;
    padding: var(--spacing-xs) var(--spacing-md) !important;
}

.btn-download-header:hover {
    background-color: var(--color-primary-dark);
}

.burger-menu {
    display: none;
    flex-direction: column;
    gap: 4px;
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--spacing-xs);
}

.burger-menu span {
    width: 24px;
    height: 2px;
    background-color: var(--color-text);
    transition: var(--transition);
}

/* Hero Section */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding-top: 80px;
    padding-bottom: var(--spacing-2xl);
    overflow: hidden;
}

.hero-background {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 0;
    overflow: hidden;
}

.bubble {
    position: absolute;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--color-primary-light), var(--color-secondary));
    opacity: 0.1;
    animation: float 20s infinite ease-in-out;
}

.bubble-1 {
    width: 300px;
    height: 300px;
    top: 10%;
    left: 10%;
    animation-delay: 0s;
}

.bubble-2 {
    width: 200px;
    height: 200px;
    top: 60%;
    right: 15%;
    animation-delay: 5s;
}

.bubble-3 {
    width: 250px;
    height: 250px;
    bottom: 20%;
    left: 50%;
    animation-delay: 10s;
}

.bubble-4 {
    width: 180px;
    height: 180px;
    top: 30%;
    right: 40%;
    animation-delay: 15s;
}

@keyframes float {
    0%, 100% {
        transform: translate(0, 0) scale(1);
    }
    25% {
        transform: translate(30px, -30px) scale(1.1);
    }
    50% {
        transform: translate(-20px, 20px) scale(0.9);
    }
    75% {
        transform: translate(20px, 30px) scale(1.05);
    }
}

.hero-content {
    position: relative;
    z-index: 1;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-2xl);
    align-items: center;
}

.hero-text {
    animation: fadeInUp 0.8s ease-out;
}

.hero-title {
    font-size: 3.5rem;
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: var(--spacing-md);
    color: var(--color-text);
}

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--color-text-light);
    margin-bottom: var(--spacing-lg);
    line-height: 1.8;
}

.hero-buttons {
    display: flex;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-sm);
    flex-wrap: wrap;
}

.hero-note {
    color: var(--color-text-light);
    font-size: 0.9rem;
}

/* Buttons */
.btn {
    display: inline-block;
    padding: var(--spacing-sm) var(--spacing-lg);
    border-radius: var(--radius-lg);
    text-decoration: none;
    font-weight: 600;
    transition: var(--transition);
    border: none;
    cursor: pointer;
    font-size: 1rem;
}

.btn-primary {
    background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
    color: white;
    box-shadow: var(--shadow-md);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn-primary:disabled,
.btn-primary.disabled {
    opacity: 0.5;
    cursor: not-allowed;
    pointer-events: none;
}

.btn-primary:disabled:hover,
.btn-primary.disabled:hover {
    transform: none;
    box-shadow: var(--shadow-md);
}

.btn-large {
    padding: var(--spacing-md) var(--spacing-xl);
    font-size: 1.1rem;
}

/* App Screenshots */
.hero-illustration {
    animation: fadeInRight 0.8s ease-out;
}

.app-screenshots {
    display: flex;
    gap: var(--spacing-lg);
    align-items: flex-start;
    justify-content: center;
    flex-wrap: wrap;
}

.screenshot-item {
    position: relative;
    background: white;
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-xl);
    overflow: hidden;
    transition: var(--transition);
    max-width: 100%;
}

.screenshot-item:hover {
    transform: translateY(-10px);
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
}

.screenshot-windows {
    transform: perspective(1000px) rotateY(-5deg) rotateX(5deg);
}

.screenshot-windows:hover {
    transform: perspective(1000px) rotateY(0deg) rotateX(0deg) translateY(-10px);
}

.screenshot-mac {
    transform: perspective(1000px) rotateY(5deg) rotateX(5deg);
}

.screenshot-mac:hover {
    transform: perspective(1000px) rotateY(0deg) rotateX(0deg) translateY(-10px);
}

.screenshot-label {
    position: absolute;
    top: var(--spacing-sm);
    left: 50%;
    transform: translateX(-50%);
    background: rgba(0, 0, 0, 0.7);
    color: white;
    padding: var(--spacing-xs) var(--spacing-md);
    border-radius: var(--radius-md);
    font-size: 0.85rem;
    font-weight: 600;
    z-index: 10;
    backdrop-filter: blur(10px);
}

.screenshot-image {
    width: 100%;
    height: auto;
    display: block;
    max-width: 500px;
    object-fit: contain;
}

/* Section Styles */
section {
    padding: var(--spacing-2xl) 0;
    position: relative;
}

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

/* Fade-in Animation Classes */
.fade-in {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

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

.features-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-lg);
}

.feature-card {
    background: white;
    padding: var(--spacing-lg);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-md);
    transition: var(--transition);
    text-align: center;
}

.feature-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-xl);
}

.feature-icon {
    font-size: 3rem;
    margin-bottom: var(--spacing-md);
}

.feature-title {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
    color: var(--color-text);
}

.feature-text {
    color: var(--color-text-light);
    line-height: 1.7;
}

/* Security Section */
.security-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-2xl);
    align-items: center;
}

.security-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

.security-item {
    display: flex;
    gap: var(--spacing-md);
    align-items: flex-start;
}

.security-icon {
    font-size: 2rem;
    flex-shrink: 0;
}

.security-text h3 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
    color: var(--color-text);
}

.security-text p {
    color: var(--color-text-light);
    line-height: 1.7;
}

.security-diagram {
    display: flex;
    align-items: center;
    justify-content: space-between;
    background: var(--color-bg-light);
    padding: var(--spacing-xl);
    border-radius: var(--radius-xl);
    gap: var(--spacing-md);
}

.diagram-participant {
    text-align: center;
    flex: 1;
}

.participant-icon {
    font-size: 3rem;
    margin-bottom: var(--spacing-sm);
}

.participant-label {
    font-weight: 600;
    color: var(--color-text);
}

.diagram-channel {
    flex: 1;
    text-align: center;
    position: relative;
}

.channel-label {
    font-weight: 600;
    color: var(--color-primary);
    margin-bottom: var(--spacing-sm);
    font-size: 0.9rem;
}

.channel-lock {
    font-size: 2rem;
    margin-bottom: var(--spacing-sm);
}

.channel-line {
    height: 2px;
    background: linear-gradient(90deg, var(--color-primary), var(--color-secondary));
    position: relative;
}

.channel-line::before,
.channel-line::after {
    content: '';
    position: absolute;
    width: 0;
    height: 0;
    border-style: solid;
}

.channel-line::before {
    left: 0;
    top: -4px;
    border-width: 5px 10px 5px 0;
    border-color: transparent var(--color-primary) transparent transparent;
}

.channel-line::after {
    right: 0;
    top: -4px;
    border-width: 5px 0 5px 10px;
    border-color: transparent transparent transparent var(--color-secondary);
}

/* How It Works Section */
.how-it-works {
    background-color: var(--color-bg-light);
}

.timeline {
    max-width: 800px;
    margin: 0 auto;
    position: relative;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 30px;
    top: 0;
    bottom: 0;
    width: 2px;
    background: linear-gradient(180deg, var(--color-primary), var(--color-secondary));
}

.timeline-step {
    display: flex;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
    position: relative;
}

.timeline-number {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    font-weight: 700;
    flex-shrink: 0;
    box-shadow: var(--shadow-md);
}

.timeline-content {
    flex: 1;
    background: white;
    padding: var(--spacing-lg);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-md);
}

.timeline-content h3 {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
    color: var(--color-text);
}

.timeline-content p {
    color: var(--color-text-light);
    line-height: 1.7;
}

/* For Teams Section */
.teams-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-lg);
}

.team-card {
    background: white;
    padding: var(--spacing-xl);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-md);
    text-align: center;
    transition: var(--transition);
}

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

.team-icon {
    font-size: 3rem;
    margin-bottom: var(--spacing-md);
}

.team-title {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
    color: var(--color-text);
}

.team-text {
    color: var(--color-text-light);
    line-height: 1.7;
}

/* Developers Section */
.developers {
    background-color: var(--color-bg-light);
}

.developers-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-lg);
}

.developer-card {
    background: white;
    padding: var(--spacing-xl);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-md);
    text-align: center;
    transition: var(--transition);
}

.developer-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-xl);
    border: 2px solid var(--color-primary-light);
}

.developer-avatar {
    width: 100px;
    height: 100px;
    border-radius: 50%;
    margin: 0 auto var(--spacing-md);
    object-fit: cover;
    border: 3px solid var(--color-primary-light);
    display: block;
    box-shadow: var(--shadow-md);
}

.developer-name {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
    color: var(--color-text);
}

.developer-role {
    color: var(--color-primary);
    font-weight: 500;
    margin-bottom: var(--spacing-md);
}

.developer-bio {
    color: var(--color-text-light);
    line-height: 1.7;
}

/* Testimonials Section */
.testimonials-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-lg);
}

.testimonial-card {
    background: white;
    padding: var(--spacing-xl);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-md);
    transition: var(--transition);
}

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

.testimonial-quote {
    font-size: 1.1rem;
    line-height: 1.8;
    color: var(--color-text);
    margin-bottom: var(--spacing-md);
    font-style: italic;
}

.testimonial-name {
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: var(--spacing-xs);
}

.testimonial-role {
    color: var(--color-text-light);
    font-size: 0.9rem;
}

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

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

.faq-item {
    background: white;
    border-radius: var(--radius-lg);
    margin-bottom: var(--spacing-md);
    box-shadow: var(--shadow-sm);
    overflow: hidden;
}

.faq-question {
    width: 100%;
    padding: var(--spacing-lg);
    background: none;
    border: none;
    text-align: left;
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--color-text);
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: var(--transition);
}

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

.faq-icon {
    font-size: 1.5rem;
    color: var(--color-primary);
    transition: var(--transition);
    font-weight: 300;
}

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

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease-out, padding 0.3s ease-out;
    padding: 0 var(--spacing-lg);
}

.faq-item.active .faq-answer {
    max-height: 500px;
    padding: 0 var(--spacing-lg) var(--spacing-lg);
}

.faq-answer p {
    color: var(--color-text-light);
    line-height: 1.7;
}

/* Download Section */
.download {
    text-align: center;
    background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
    color: white;
}

.download .section-title {
    color: white;
}

.download-subtitle {
    font-size: 1.25rem;
    margin-bottom: var(--spacing-xl);
    opacity: 0.9;
}

.download-buttons {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
    margin-bottom: var(--spacing-md);
    flex-wrap: wrap;
}

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

.btn-download:hover {
    background: var(--color-bg-light);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn-download:disabled,
.btn-download.disabled {
    opacity: 0.5;
    cursor: not-allowed;
    pointer-events: none;
}

.btn-download:disabled:hover,
.btn-download.disabled:hover {
    transform: none;
    box-shadow: none;
}

.download-note {
    font-size: 0.9rem;
    opacity: 0.8;
}

/* Footer */
.footer {
    background-color: var(--color-bg-dark);
    color: white;
    padding: var(--spacing-xl) 0 var(--spacing-md);
}

.footer-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-lg);
}

.footer-logo {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
    color: var(--color-primary-light);
}

.footer-tagline {
    color: rgba(255, 255, 255, 0.7);
}

.footer-links {
    display: flex;
    gap: var(--spacing-xl);
}

.footer-column h4 {
    margin-bottom: var(--spacing-sm);
    color: white;
}

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

.footer-column ul li {
    margin-bottom: var(--spacing-xs);
}

.footer-column a {
    color: rgba(255, 255, 255, 0.7);
    text-decoration: none;
    transition: var(--transition);
}

.footer-column a:hover {
    color: var(--color-primary-light);
}

.footer-bottom {
    text-align: center;
    padding-top: var(--spacing-md);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    color: rgba(255, 255, 255, 0.6);
}

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

@keyframes fadeInRight {
    from {
        opacity: 0;
        transform: translateX(30px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

/* Responsive Design */
@media (max-width: 1024px) {
    .hero-content {
        grid-template-columns: 1fr;
    }
    
    .hero-illustration {
        order: -1;
    }
    
    .app-screenshots {
        flex-direction: column;
        align-items: center;
    }
    
    .screenshot-windows,
    .screenshot-mac {
        transform: none;
    }
    
    .screenshot-windows:hover,
    .screenshot-mac:hover {
        transform: translateY(-10px);
    }
    
    .features-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .security-content {
        grid-template-columns: 1fr;
    }
    
    .teams-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .developers-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .testimonials-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .nav {
        position: fixed;
        top: 70px;
        left: 0;
        right: 0;
        background: white;
        box-shadow: var(--shadow-lg);
        max-height: 0;
        overflow: hidden;
        transition: max-height 0.3s ease-out;
    }
    
    .nav.active {
        max-height: 500px;
    }
    
    .nav-list {
        flex-direction: column;
        padding: var(--spacing-md);
        gap: var(--spacing-sm);
        align-items: flex-start;
    }
    
    .burger-menu {
        display: flex;
    }
    
    .hero-title {
        font-size: 2.5rem;
    }
    
    .hero-subtitle {
        font-size: 1.1rem;
    }
    
    .hero-buttons {
        flex-direction: column;
    }
    
    .hero-buttons .btn {
        width: 100%;
        text-align: center;
    }
    
    .app-screenshots {
        flex-direction: column;
        gap: var(--spacing-md);
    }
    
    .screenshot-image {
        max-width: 100%;
    }
    
    .section-title {
        font-size: 2rem;
    }
    
    .features-grid {
        grid-template-columns: 1fr;
    }
    
    .security-diagram {
        flex-direction: column;
        text-align: center;
    }
    
    .channel-line {
        width: 2px;
        height: 50px;
        margin: var(--spacing-sm) auto;
    }
    
    .channel-line::before,
    .channel-line::after {
        left: 50%;
        transform: translateX(-50%);
    }
    
    .channel-line::before {
        top: -4px;
        border-width: 0 5px 10px 5px;
        border-color: transparent transparent var(--color-primary) transparent;
    }
    
    .channel-line::after {
        bottom: -4px;
        top: auto;
        border-width: 10px 5px 0 5px;
        border-color: var(--color-secondary) transparent transparent transparent;
    }
    
    .timeline::before {
        left: 30px;
    }
    
    .teams-grid {
        grid-template-columns: 1fr;
    }
    
    .developers-grid {
        grid-template-columns: 1fr;
    }
    
    .testimonials-grid {
        grid-template-columns: 1fr;
    }
    
    .download-buttons {
        flex-direction: column;
    }
    
    .download-buttons .btn {
        width: 100%;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 2rem;
    }
    
    .container {
        padding: 0 var(--spacing-sm);
    }
    
    section {
        padding: var(--spacing-xl) 0;
    }
}