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

:root {
    --vk-blue: #2787F5;
    --vk-light-blue: #4BB5FF;
    --vk-dark: #19191A;
    --vk-darker: #0D0D0E;
    --vk-gray: #5C5C5F;
    --light: #F8F9FA;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background: var(--vk-darker);
    color: var(--light);
    line-height: 1.6;
    overflow-x: hidden;
}

/* Background Effects */
.gradient-bg {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: radial-gradient(circle at 20% 50%, rgba(39, 135, 245, 0.15) 0%, transparent 50%),
                radial-gradient(circle at 80% 20%, rgba(75, 181, 255, 0.15) 0%, transparent 50%);
    z-index: 0;
}

#particleCanvas {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 0;
    opacity: 0.3;
    will-change: contents;
    image-rendering: optimizeSpeed;
}

/* Navbar */
.navbar {
    background: rgba(25, 25, 26, 0.95);
    backdrop-filter: blur(10px);
    position: sticky;
    top: 0;
    z-index: 1000;
    border-bottom: 1px solid rgba(39, 135, 245, 0.2);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 1.5rem;
    font-weight: 700;
}

.vk-logo {
    filter: drop-shadow(0 0 10px rgba(39, 135, 245, 0.5));
}

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

.nav-menu a {
    color: var(--light);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.3s;
}

.nav-menu a:hover {
    color: var(--vk-blue);
}

/* Container */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
    position: relative;
    z-index: 1;
}

/* Hero */
.hero {
    text-align: center;
    padding: 80px 20px;
}

.hero-icon {
    margin-bottom: 2rem;
    animation: floatIcon 3s ease-in-out infinite;
}

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

.hero h1 {
    font-size: 3.5rem;
    margin-bottom: 1.5rem;
    background: linear-gradient(135deg, #fff 0%, var(--vk-light-blue) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 1.25rem;
    color: #ccc;
    max-width: 800px;
    margin: 0 auto 3rem;
    line-height: 1.8;
}

.hero-badges {
    display: flex;
    justify-content: center;
    gap: 1.5rem;
    margin: 3rem 0;
    flex-wrap: wrap;
}

.badge {
    background: rgba(39, 135, 245, 0.1);
    border: 1px solid var(--vk-blue);
    padding: 0.75rem 1.5rem;
    border-radius: 50px;
    display: flex;
    align-items: center;
    gap: 8px;
    font-weight: 600;
}

.badge-icon {
    font-size: 1.25rem;
}

.cta-button {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    background: linear-gradient(135deg, var(--vk-blue), var(--vk-light-blue));
    color: white;
    padding: 1.25rem 3rem;
    border-radius: 50px;
    text-decoration: none;
    font-weight: 700;
    font-size: 1.1rem;
    transition: all 0.3s;
    box-shadow: 0 10px 30px rgba(39, 135, 245, 0.3);
}

.cta-button {
    will-change: transform;
}

.cta-button:hover {
    transform: translateY(-3px);
    box-shadow: 0 15px 40px rgba(39, 135, 245, 0.5);
}

/* About Section */
.about-section {
    padding: 80px 0;
}

.section-title {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 3rem;
}

.about-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
}

.large-text {
    font-size: 1.2rem;
    line-height: 1.8;
    margin-bottom: 2rem;
    color: #ddd;
}

.large-text a {
    color: var(--vk-blue);
    text-decoration: none;
    font-weight: 600;
    transition: color 0.3s;
}

.large-text a:hover {
    color: var(--vk-light-blue);
    text-decoration: underline;
}

.feature-list {
    list-style: none;
}

.feature-list li {
    padding: 0.75rem 0;
    font-size: 1.1rem;
    color: #ccc;
    border-bottom: 1px solid rgba(255,255,255,0.05);
}

/* Phone Mockup */
.phone-mockup {
    width: 280px;
    height: 580px;
    background: linear-gradient(135deg, #1a1a1b 0%, #2a2a2c 100%);
    border-radius: 40px;
    padding: 15px;
    box-shadow: 0 20px 60px rgba(0,0,0,0.5);
    margin: 0 auto;
    position: relative;
}

.phone-mockup::before {
    content: '';
    position: absolute;
    top: 15px;
    left: 50%;
    transform: translateX(-50%);
    width: 80px;
    height: 25px;
    background: #1a1a1b;
    border-radius: 0 0 20px 20px;
    z-index: 10;
}

.phone-screen {
    width: 100%;
    height: 100%;
    background: linear-gradient(180deg, #2787F5 0%, #1a1a1b 40%);
    border-radius: 30px;
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
}

.call-interface {
    text-align: center;
    color: white;
}

.caller-name {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
}

.call-status {
    font-size: 1rem;
    opacity: 0.8;
    margin-bottom: 3rem;
}

.call-buttons {
    display: flex;
    gap: 2rem;
    justify-content: center;
}

.call-btn {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    cursor: pointer;
    transition: transform 0.3s;
}

.call-btn:hover {
    transform: scale(1.1);
}

.call-btn.accept {
    background: #4CAF50;
}

.call-btn.decline {
    background: #f44336;
}

/* Features Section */
.features-section {
    padding: 80px 0;
    background: rgba(25, 25, 26, 0.5);
}

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

.feature-card {
    background: rgba(25, 25, 26, 0.8);
    border: 1px solid rgba(39, 135, 245, 0.2);
    border-radius: 15px;
    padding: 2rem;
    transition: all 0.3s;
}

.feature-card {
    will-change: transform;
}

.feature-card:hover {
    border-color: var(--vk-blue);
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(39, 135, 245, 0.2);
}

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

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

.feature-card p {
    color: #aaa;
    line-height: 1.6;
}

/* Download Section */
.download-section {
    padding: 80px 0;
}

.section-subtitle {
    text-align: center;
    color: #aaa;
    margin-bottom: 3rem;
    font-size: 1.1rem;
}

/* Windows отдельный блок */
.windows-download-block {
    margin-bottom: 4rem;
    display: flex;
    justify-content: center;
}

.windows-card {
    background: rgba(25, 25, 26, 0.9);
    border: 3px solid var(--vk-blue);
    border-radius: 20px;
    padding: 3rem;
    text-align: center;
    position: relative;
    transition: all 0.3s;
    max-width: 500px;
    width: 100%;
    box-shadow: 0 20px 60px rgba(39, 135, 245, 0.3);
}

.windows-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 25px 70px rgba(39, 135, 245, 0.4);
}

.platform-icon-windows {
    font-size: 5rem;
    margin-bottom: 1.5rem;
    animation: pulseIcon 2s ease-in-out infinite;
}

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

.windows-card h3 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
    color: var(--vk-light-blue);
}

.windows-card p {
    color: #aaa;
    font-size: 1.2rem;
    margin-bottom: 2rem;
}

.download-btn-large {
    display: inline-block;
    background: linear-gradient(135deg, var(--vk-blue), var(--vk-light-blue));
    color: white;
    padding: 1.5rem 3rem;
    border-radius: 50px;
    text-decoration: none;
    font-weight: 700;
    font-size: 1.25rem;
    transition: all 0.3s;
    box-shadow: 0 10px 30px rgba(39, 135, 245, 0.4);
}

.download-btn-large:hover {
    transform: translateY(-3px);
    box-shadow: 0 15px 40px rgba(39, 135, 245, 0.6);
}

.download-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
}

.download-card {
    background: rgba(25, 25, 26, 0.8);
    border: 2px solid rgba(39, 135, 245, 0.2);
    border-radius: 15px;
    padding: 2.5rem;
    text-align: center;
    position: relative;
    transition: all 0.3s;
}

.download-card:hover {
    border-color: var(--vk-blue);
    transform: translateY(-5px);
    box-shadow: 0 15px 40px rgba(39, 135, 245, 0.2);
}

.download-card,
.feature-card,
.step-card {
    will-change: transform;
}

.download-card.featured {
    border-color: var(--vk-blue);
    border-width: 3px;
}

.platform-badge {
    position: absolute;
    top: -12px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--vk-blue);
    color: white;
    padding: 0.4rem 1.5rem;
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 700;
}

.platform-icon {
    font-size: 4rem;
    margin-bottom: 1rem;
}

.download-card h3 {
    font-size: 1.75rem;
    margin-bottom: 0.5rem;
}

.download-card p {
    color: #aaa;
    margin-bottom: 1.5rem;
}

.version-info {
    display: flex;
    gap: 1rem;
    justify-content: center;
    margin: 1.5rem 0;
    font-size: 0.9rem;
    color: #888;
}

.download-btn {
    display: block;
    background: linear-gradient(135deg, var(--vk-blue), var(--vk-light-blue));
    color: white;
    padding: 1rem 2rem;
    border-radius: 50px;
    text-decoration: none;
    font-weight: 700;
    transition: all 0.3s;
    margin-bottom: 1rem;
    box-shadow: 0 5px 20px rgba(39, 135, 245, 0.3);
}

.download-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(39, 135, 245, 0.5);
}

.download-btn.secondary {
    background: transparent;
    border: 2px solid var(--vk-blue);
    color: var(--vk-blue);
}

.download-btn.secondary:hover {
    background: var(--vk-blue);
    color: white;
}

.download-link {
    display: inline-block;
    color: var(--vk-blue);
    text-decoration: none;
    font-size: 0.9rem;
    margin-top: 0.5rem;
}

.download-link:hover {
    text-decoration: underline;
}

/* How To Section */
.how-to-section {
    padding: 80px 0;
    background: rgba(25, 25, 26, 0.5);
}

.how-to-steps {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-bottom: 4rem;
}

.step-card {
    background: rgba(25, 25, 26, 0.8);
    border: 2px solid rgba(39, 135, 245, 0.2);
    border-radius: 15px;
    padding: 2rem;
    position: relative;
    transition: all 0.3s;
}

.step-card:hover {
    border-color: var(--vk-blue);
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(39, 135, 245, 0.2);
}

.step-number {
    position: absolute;
    top: -15px;
    left: 20px;
    background: var(--vk-blue);
    color: white;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 1.2rem;
    box-shadow: 0 5px 15px rgba(39, 135, 245, 0.4);
}

.step-icon {
    font-size: 3.5rem;
    margin: 1.5rem 0 1rem;
    text-align: center;
}

.step-card h3 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    color: var(--vk-light-blue);
    text-align: center;
}

.step-card p {
    color: #ccc;
    line-height: 1.7;
    text-align: center;
}

.how-to-tips {
    margin-top: 4rem;
    padding-top: 3rem;
    border-top: 2px solid rgba(39, 135, 245, 0.2);
}

.tips-title {
    text-align: center;
    font-size: 2rem;
    margin-bottom: 3rem;
    color: var(--vk-light-blue);
}

.tips-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
}

.tip-item {
    background: rgba(39, 135, 245, 0.1);
    border: 1px solid rgba(39, 135, 245, 0.3);
    border-radius: 12px;
    padding: 1.5rem;
    text-align: center;
    transition: all 0.3s;
}

.tip-item:hover {
    background: rgba(39, 135, 245, 0.15);
    border-color: var(--vk-blue);
    transform: translateY(-3px);
}

.tip-icon {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.tip-item h4 {
    font-size: 1.2rem;
    margin-bottom: 0.75rem;
    color: var(--vk-light-blue);
}

.tip-item p {
    color: #aaa;
    font-size: 0.95rem;
    line-height: 1.6;
}

/* FAQ Section - Accordion */
.faq-section {
    padding: 80px 0;
    background: rgba(25, 25, 26, 0.3);
}

.faq-container {
    max-width: 900px;
    margin: 0 auto;
}

.faq-item {
    background: rgba(25, 25, 26, 0.8);
    border: 1px solid rgba(39, 135, 245, 0.2);
    border-radius: 12px;
    margin-bottom: 1rem;
    overflow: hidden;
    transition: all 0.3s ease;
}

.faq-item:hover {
    border-color: rgba(39, 135, 245, 0.4);
}

.faq-item.active {
    border-color: var(--vk-blue);
    box-shadow: 0 5px 20px rgba(39, 135, 245, 0.2);
}

.faq-question {
    width: 100%;
    background: transparent;
    border: none;
    padding: 1.5rem;
    text-align: left;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 1rem;
    color: var(--light);
    font-size: 1.1rem;
    font-weight: 600;
    transition: all 0.3s ease;
}

.faq-question:hover {
    background: rgba(39, 135, 245, 0.1);
    color: var(--vk-light-blue);
}

.faq-question span {
    flex: 1;
}

.faq-icon {
    width: 24px;
    height: 24px;
    transition: transform 0.3s ease;
    flex-shrink: 0;
    color: var(--vk-blue);
}

.faq-item.active .faq-icon {
    transform: rotate(180deg);
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.4s ease, padding 0.4s ease;
    padding: 0 1.5rem;
}

.faq-item.active .faq-answer {
    max-height: 1000px;
    padding: 0 1.5rem 1.5rem;
}

.faq-answer p {
    color: #ccc;
    line-height: 1.8;
    margin: 0;
    padding-top: 1rem;
}

.faq-answer strong {
    color: var(--vk-light-blue);
    display: block;
    margin-bottom: 0.5rem;
}

/* Footer */
.footer {
    background: var(--vk-dark);
    border-top: 1px solid rgba(39, 135, 245, 0.2);
    padding: 2rem;
    text-align: center;
    margin-top: 80px;
}

.footer-content {
    max-width: 800px;
    margin: 0 auto;
}

.footer-note {
    color: #666;
    font-size: 0.9rem;
    margin-top: 1rem;
}

.footer-links {
    margin-top: 1rem;
}

.footer-links a {
    color: var(--vk-blue);
    text-decoration: none;
    transition: color 0.3s;
}

.footer-links a:hover {
    color: var(--vk-light-blue);
    text-decoration: underline;
}

/* Responsive */
@media (max-width: 768px) {
    .hero h1 {
        font-size: 2.5rem;
    }
    
    .hero-badges {
        flex-direction: column;
        align-items: center;
    }
    
    .nav-menu {
        display: none;
    }
    
    .about-content {
        grid-template-columns: 1fr;
    }
    
    .phone-mockup {
        width: 240px;
        height: 500px;
    }
    
    .features-grid,
    .download-grid,
    .faq-grid {
        grid-template-columns: 1fr;
    }
    
    .windows-card {
        padding: 2rem;
        margin: 0 1rem;
    }
    
    .windows-card h3 {
        font-size: 2rem;
    }
    
    .platform-icon-windows {
        font-size: 4rem;
    }
    
    .download-btn-large {
        padding: 1.2rem 2rem;
        font-size: 1.1rem;
    }
    
    .how-to-steps,
    .tips-grid {
        grid-template-columns: 1fr;
    }
    
    .step-card {
        padding: 1.5rem;
    }
    
    .tips-title {
        font-size: 1.5rem;
    }
    
    .faq-question {
        font-size: 1rem;
        padding: 1.2rem;
    }
    
    .faq-answer {
        padding: 0 1.2rem;
    }
    
    .faq-item.active .faq-answer {
        padding: 0 1.2rem 1.2rem;
    }
    
    .faq-container {
        padding: 0 1rem;
    }
}