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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #fafafa;
}

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

/* Header */
header {
    background: #fff;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 1000;
}

nav {
    padding: 1rem 0;
    position: relative;
}

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

.logo {
    font-size: 1.8rem;
    font-weight: bold;
    color: #007DB8;
}

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

.nav-links a {
    text-decoration: none;
    color: #333;
    font-weight: 500;
    transition: color 0.3s ease;
}

.nav-links a:hover {
    color: #007DB8;
}

/* Mobile Menu Button */
.mobile-menu-btn {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    flex-direction: column;
    gap: 4px;
    padding: 8px;
}

.mobile-menu-btn span {
    width: 25px;
    height: 3px;
    background-color: #007DB8;
    transition: all 0.3s ease;
    border-radius: 2px;
}

.mobile-menu-btn.active span:nth-child(1) {
    transform: rotate(45deg) translate(7px, 7px);
}

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

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

/* Hero Section */
.hero {
    padding: 120px 0 80px;
    background: linear-gradient(135deg, #007DB8 0%, #005a8a 100%);
    color: white;
}

.hero .container {
    display: flex;
    flex-direction: column;
    gap: 3rem;
    align-items: center;
    text-align: center;
}

.hero-content h2 {
    font-size: 3rem;
    margin-bottom: 1rem;
    font-weight: 700;
}

.hero-content p {
    font-size: 1.2rem;
    margin-bottom: 2rem;
    opacity: 0.9;
}

.cta-buttons {
    display: flex;
    gap: 1rem;
    justify-content: center;
}

.btn {
    display: inline-block;
    padding: 12px 24px;
    text-decoration: none;
    border-radius: 8px;
    font-weight: 600;
    transition: all 0.3s ease;
    border: none;
    cursor: pointer;
}

.btn-primary {
    background: #fff;
    color: #007DB8;
}

.btn-primary:hover {
    background: #f8fafc;
    transform: translateY(-2px);
}

.btn-secondary {
    background: transparent;
    color: white;
    border: 2px solid white;
}

.btn-secondary:hover {
    background: white;
    color: #007DB8;
}

.btn-large {
    padding: 16px 32px;
    font-size: 1.1rem;
}

/* Image screenshot */
.hero-image {
    width: 100%;
    max-width: 900px;
    display: flex;
    flex-direction: column;
    gap: 2rem;
    align-items: center;
}

.screenshot-container {
    width: 100%;
    max-width: 800px;
    text-align: center;
}

.poznote-screenshot {
    max-width: 100%;
    height: auto;
    border-radius: 12px;
    box-shadow: 0 20px 40px rgba(0,0,0,0.3);
    border: 1px solid rgba(255,255,255,0.2);
}

.installation-info {
    text-align: center;
    margin-top: 3rem;
    padding: 2rem;
    background: #f8fafc;
    border-radius: 12px;
}

.installation-info h3 {
    margin-bottom: 1rem;
    color: #1e293b;
}

.installation-info p {
    margin-bottom: 1.5rem;
    color: #64748b;
}

/* Features Section */
.features {
    padding: 80px 0;
    background: #fff;
}

.features h2 {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 3rem;
    color: #1e293b;
}

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

.feature-card {
    text-align: center;
    padding: 2rem;
    background: #f8fafc;
    border-radius: 12px;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.feature-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(0,0,0,0.1);
}

.feature-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
    color: #007DB8;
}

.feature-icon i {
    font-size: 3rem;
}

.feature-card h3 {
    font-size: 1.3rem;
    margin-bottom: 1rem;
    color: #1e293b;
}

.feature-card p {
    color: #64748b;
}

/* About Section */
.about {
    padding: 80px 0;
    background: #f8fafc;
}

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

.about h2 {
    font-size: 2.5rem;
    margin-bottom: 2rem;
    color: #1e293b;
}

.about p {
    font-size: 1.1rem;
    color: #64748b;
    margin-bottom: 3rem;
}

.tech-stack h3 {
    font-size: 1.5rem;
    margin-bottom: 1.5rem;
    color: #1e293b;
}

.tech-badges {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 1rem;
}

.tech-badge {
    background: #007DB8;
    color: white;
    padding: 8px 16px;
    border-radius: 20px;
    font-size: 0.9rem;
    font-weight: 500;
}

/* Footer */
footer {
    background: #0f172a;
    color: white;
    padding: 60px 0 20px;
}

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

.footer-section h3 {
    margin-bottom: 1rem;
    color: #007DB8;
}

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

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

.footer-section a {
    color: #cbd5e1;
    text-decoration: none;
    transition: color 0.3s ease;
}

.footer-section a:hover {
    color: #007DB8;
}

.footer-section p {
    color: #94a3b8;
    line-height: 1.6;
}

.footer-bottom {
    text-align: center;
    padding-top: 2rem;
    border-top: 1px solid #334155;
    color: #64748b;
}

/* Responsive Design */
@media (max-width: 768px) {
    .hero .container {
        flex-direction: column;
        gap: 2rem;
        text-align: center;
    }

    .hero-content h2 {
        font-size: 2rem;
    }

    .nav-links {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        width: 100%;
        background: #fff;
        flex-direction: column;
        padding: 1rem 0;
        box-shadow: 0 2px 10px rgba(0,0,0,0.1);
        gap: 0;
    }

    .nav-links.active {
        display: flex;
    }

    .nav-links li {
        padding: 0.5rem 0;
        text-align: center;
    }

    .nav-links a {
        display: block;
        padding: 0.5rem 1rem;
    }

    .mobile-menu-btn {
        display: flex;
    }

    .features-grid {
        grid-template-columns: 1fr;
    }

    .cta-buttons {
        flex-direction: column;
        align-items: center;
    }
    
    .tech-badges {
        justify-content: center;
    }

    .hero-image {
        gap: 1.5rem;
    }

    .screenshot-container {
        max-width: 100%;
    }

    .poznote-screenshot {
        border-radius: 8px;
        box-shadow: 0 10px 20px rgba(0,0,0,0.3);
    }

    /* Footer mobile styles */
    .footer-content {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }

    .footer-section {
        text-align: center;
    }

    .footer-section ul li {
        margin-bottom: 0.8rem;
    }

    footer {
        padding: 40px 0 20px;
    }
}

/* Email Popup Styles */
.email-popup {
    display: none;
    position: fixed;
    z-index: 2000;
    left: 0;
    top: 0;
    width: 100vw;
    height: 100vh;
    background: rgba(0,0,0,0.45);
    justify-content: center;
    align-items: center;
    animation: fadeInBg 0.3s;
}

.email-popup.active {
    display: flex;
}

@keyframes fadeInBg {
    from { background: rgba(0,0,0,0); }
    to { background: rgba(0,0,0,0.45); }
}

.email-popup-content {
    background: #fff;
    padding: 2.2rem 2.7rem 1.7rem 2.7rem;
    border-radius: 18px;
    box-shadow: 0 8px 40px rgba(0,125,184,0.18), 0 1.5px 8px rgba(0,0,0,0.10);
    text-align: center;
    min-width: 260px;
    max-width: 92vw;
    position: relative;
    animation: popupAppear 0.25s cubic-bezier(.4,1.6,.6,1) both;
}

@keyframes popupAppear {
    from { transform: translateY(40px) scale(0.95); opacity: 0; }
    to { transform: none; opacity: 1; }
}

.email-popup-close {
    position: absolute;
    top: 10px;
    right: 18px;
    font-size: 2.1rem;
    color: #007DB8;
    cursor: pointer;
    font-weight: bold;
    transition: color 0.2s, transform 0.2s;
    line-height: 1;
}

.email-popup-close:hover {
    color: #005a8a;
    transform: scale(1.15) rotate(8deg);
}

.email-popup-content h2 {
    color: #007DB8;
    margin-bottom: 0.7rem;
    font-size: 1.35rem;
    letter-spacing: 0.01em;
}

.email-popup-content p {
    font-size: 1.13rem;
    margin-bottom: 0;
}

.email-popup-content a {
    color: #007DB8;
    font-weight: 600;
    text-decoration: underline dotted;
    word-break: break-all;
    font-size: 1.13rem;
    transition: color 0.2s;
}

.email-popup-content a:hover {
    color: #005a8a;
}