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

:root {
    --primary-blue: #2563eb;
    --primary-blue-dark: #1d4ed8;
    --primary-blue-light: #3b82f6;
    --secondary-blue: #60a5fa;
    --accent-blue: #dbeafe;
    --text-dark: #1e293b;
    --text-gray: #64748b;
    --text-light: #94a3b8;
    --bg-white: #ffffff;
    --bg-light: #f8fafc;
    --bg-gray: #f1f5f9;
    --border-color: #e2e8f0;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 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);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
}

html {
    scroll-behavior: smooth;
}

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

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: var(--bg-white);
    box-shadow: var(--shadow-sm);
    z-index: 1000;
    transition: box-shadow 0.3s ease;
}

header.scrolled {
    box-shadow: var(--shadow-md);
}

header nav {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 16px 24px;
    gap: 32px;
}

.logo {
    font-size: 24px;
    font-weight: 700;
    color: var(--primary-blue);
    white-space: nowrap;
}

.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    gap: 4px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
}

.mobile-menu-toggle span {
    width: 24px;
    height: 2px;
    background: var(--text-dark);
    transition: all 0.3s ease;
}

.mobile-menu-toggle.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

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

.mobile-menu-toggle.active span:nth-child(3) {
    transform: rotate(-45deg) translate(7px, -6px);
}

.nav-links {
    display: flex;
    list-style: none;
    gap: 32px;
    flex: 1;
    justify-content: center;
}

.nav-links a {
    text-decoration: none;
    color: var(--text-gray);
    font-weight: 500;
    transition: color 0.3s ease;
    font-size: 15px;
}

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

.btn {
    display: inline-block;
    padding: 10px 24px;
    border-radius: 8px;
    font-weight: 600;
    text-decoration: none;
    transition: all 0.3s ease;
    border: 2px solid transparent;
    cursor: pointer;
    font-size: 15px;
    text-align: center;
}

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

.btn-primary:hover {
    background: var(--primary-blue-dark);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.btn-secondary {
    background: transparent;
    color: var(--primary-blue);
    border-color: var(--primary-blue);
}

.btn-secondary:hover {
    background: var(--accent-blue);
    transform: translateY(-1px);
}

.btn-large {
    padding: 14px 32px;
    font-size: 16px;
}

.btn-full {
    width: 100%;
}

main {
    margin-top: 72px;
}

section {
    padding: 96px 0;
}

.section-title {
    font-size: 40px;
    font-weight: 700;
    text-align: center;
    margin-bottom: 16px;
    line-height: 1.2;
    color: var(--text-dark);
}

.section-subtitle {
    font-size: 20px;
    text-align: center;
    color: var(--text-gray);
    margin-bottom: 64px;
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
}

.hero {
    background: linear-gradient(135deg, var(--bg-light) 0%, var(--bg-white) 100%);
    padding: 120px 0;
}

.hero-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 64px;
    align-items: center;
}

.hero-text h1 {
    font-size: 56px;
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: 24px;
    color: var(--text-dark);
}

.hero-subtitle {
    font-size: 20px;
    line-height: 1.6;
    color: var(--text-gray);
    margin-bottom: 32px;
}

.hero-cta {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
}

.dashboard-mockup {
    background: var(--bg-white);
    border-radius: 16px;
    box-shadow: var(--shadow-xl);
    overflow: hidden;
    border: 1px solid var(--border-color);
}

.mockup-header {
    background: var(--bg-gray);
    padding: 12px 16px;
    display: flex;
    gap: 8px;
}

.mockup-dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: var(--text-light);
}

.mockup-content {
    padding: 24px;
}

.mockup-section {
    margin-bottom: 24px;
}

.mockup-section:last-child {
    margin-bottom: 0;
}

.mockup-title {
    font-size: 12px;
    font-weight: 600;
    color: var(--text-gray);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 12px;
}

.mockup-messages {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.mockup-message {
    display: flex;
    gap: 12px;
    align-items: center;
}

.mockup-avatar {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    background: var(--accent-blue);
    flex-shrink: 0;
}

.mockup-text {
    height: 12px;
    background: var(--bg-gray);
    border-radius: 6px;
    flex: 1;
}

.mockup-chart {
    display: flex;
    gap: 12px;
    align-items: flex-end;
    height: 80px;
}

.mockup-bar {
    flex: 1;
    background: linear-gradient(to top, var(--primary-blue), var(--secondary-blue));
    border-radius: 4px;
    min-height: 20px;
}

.features {
    background: var(--bg-white);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 32px;
}

.feature-card {
    background: var(--bg-white);
    padding: 32px;
    border-radius: 16px;
    border: 1px solid var(--border-color);
    transition: all 0.3s ease;
}

.feature-card:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-4px);
}

.feature-icon {
    width: 56px;
    height: 56px;
    background: var(--accent-blue);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 28px;
    margin-bottom: 20px;
}

.feature-card h3 {
    font-size: 22px;
    font-weight: 700;
    margin-bottom: 12px;
    line-height: 1.3;
    color: var(--text-dark);
}

.feature-card > p {
    color: var(--text-gray);
    margin-bottom: 16px;
    line-height: 1.6;
}

.feature-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.feature-list li {
    color: var(--text-gray);
    padding-left: 24px;
    position: relative;
    line-height: 1.5;
    font-size: 15px;
}

.feature-list li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--primary-blue);
    font-weight: 700;
}

.how-it-works {
    background: var(--bg-light);
}

.steps {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 48px;
    max-width: 1000px;
    margin: 0 auto;
}

.step {
    text-align: center;
    position: relative;
}

.step-number {
    width: 64px;
    height: 64px;
    background: var(--primary-blue);
    color: var(--bg-white);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 28px;
    font-weight: 700;
    margin: 0 auto 24px;
    box-shadow: var(--shadow-md);
}

.step h3 {
    font-size: 24px;
    font-weight: 700;
    margin-bottom: 12px;
    line-height: 1.3;
    color: var(--text-dark);
}

.step p {
    color: var(--text-gray);
    line-height: 1.6;
}

.security {
    background: var(--bg-white);
}

.security-content {
    max-width: 1100px;
    margin: 0 auto;
}

.security-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 32px;
    margin-bottom: 64px;
}

.security-item {
    padding: 24px;
    background: var(--bg-light);
    border-radius: 12px;
    border: 1px solid var(--border-color);
}

.security-icon {
    font-size: 32px;
    margin-bottom: 16px;
}

.security-item h3 {
    font-size: 20px;
    font-weight: 700;
    margin-bottom: 12px;
    color: var(--text-dark);
    line-height: 1.3;
}

.security-item p {
    color: var(--text-gray);
    line-height: 1.6;
    font-size: 15px;
}

.security-statement {
    background: var(--bg-white);
    padding: 48px;
    border-radius: 16px;
    border: 2px solid var(--primary-blue);
    box-shadow: var(--shadow-md);
}

.security-statement h3 {
    font-size: 28px;
    font-weight: 700;
    margin-bottom: 20px;
    color: var(--text-dark);
    line-height: 1.3;
}

.security-statement p {
    color: var(--text-gray);
    line-height: 1.8;
    font-size: 17px;
    margin-bottom: 16px;
}

.security-links {
    display: flex;
    gap: 32px;
    margin-top: 32px;
    flex-wrap: wrap;
}

.security-link {
    color: var(--primary-blue);
    text-decoration: none;
    font-weight: 600;
    transition: color 0.3s ease;
    font-size: 16px;
}

.security-link:hover {
    color: var(--primary-blue-dark);
}

.pricing {
    background: var(--bg-light);
}

.pricing-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 32px;
    max-width: 1100px;
    margin: 0 auto;
}

.pricing-card {
    background: var(--bg-white);
    padding: 40px 32px;
    border-radius: 16px;
    border: 2px solid var(--border-color);
    position: relative;
    transition: all 0.3s ease;
}

.pricing-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.pricing-featured {
    border-color: var(--primary-blue);
    box-shadow: var(--shadow-lg);
}

.pricing-badge {
    position: absolute;
    top: -12px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--primary-blue);
    color: var(--bg-white);
    padding: 4px 16px;
    border-radius: 20px;
    font-size: 13px;
    font-weight: 600;
}

.pricing-card h3 {
    font-size: 28px;
    font-weight: 700;
    margin-bottom: 8px;
    color: var(--text-dark);
}

.pricing-user {
    color: var(--text-gray);
    margin-bottom: 24px;
    font-size: 15px;
}

.pricing-price {
    margin-bottom: 32px;
}

.price-amount {
    font-size: 48px;
    font-weight: 700;
    color: var(--text-dark);
}

.price-period {
    color: var(--text-gray);
    font-size: 18px;
}

.pricing-features {
    list-style: none;
    margin-bottom: 32px;
    display: flex;
    flex-direction: column;
    gap: 14px;
}

.pricing-features li {
    color: var(--text-gray);
    padding-left: 28px;
    position: relative;
    line-height: 1.5;
}

.pricing-features li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--primary-blue);
    font-weight: 700;
    font-size: 18px;
}

.faq {
    background: var(--bg-white);
}

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

.faq-item {
    border-bottom: 1px solid var(--border-color);
}

.faq-question {
    width: 100%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 24px 0;
    background: none;
    border: none;
    cursor: pointer;
    text-align: left;
    font-size: 18px;
    font-weight: 600;
    color: var(--text-dark);
    transition: color 0.3s ease;
}

.faq-question:hover {
    color: var(--primary-blue);
}

.faq-icon {
    font-size: 28px;
    color: var(--primary-blue);
    transition: transform 0.3s ease;
    flex-shrink: 0;
    margin-left: 16px;
}

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

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

.faq-item.active .faq-answer {
    max-height: 500px;
}

.faq-answer p {
    padding-bottom: 24px;
    color: var(--text-gray);
    line-height: 1.8;
}

.contact {
    background: linear-gradient(135deg, var(--primary-blue) 0%, var(--primary-blue-dark) 100%);
    color: var(--bg-white);
}

.contact-content {
    text-align: center;
    max-width: 700px;
    margin: 0 auto;
}

.contact-content h2 {
    font-size: 40px;
    font-weight: 700;
    margin-bottom: 16px;
    line-height: 1.2;
}

.contact-content p {
    font-size: 20px;
    margin-bottom: 32px;
    opacity: 0.95;
}

.contact-cta {
    display: flex;
    gap: 16px;
    justify-content: center;
    flex-wrap: wrap;
}

.contact-cta .btn-primary {
    background: var(--bg-white);
    color: var(--primary-blue);
}

.contact-cta .btn-primary:hover {
    background: var(--bg-light);
}

.contact-cta .btn-secondary {
    background: transparent;
    color: var(--bg-white);
    border-color: var(--bg-white);
}

.contact-cta .btn-secondary:hover {
    background: rgba(255, 255, 255, 0.1);
}

footer {
    background: var(--text-dark);
    color: var(--bg-white);
    padding: 64px 0 24px;
}

.footer-content {
    display: grid;
    grid-template-columns: 1.5fr 1fr;
    gap: 64px;
    margin-bottom: 48px;
}

.footer-brand .logo {
    color: var(--bg-white);
    margin-bottom: 12px;
}

.footer-brand p {
    color: var(--text-light);
    line-height: 1.6;
}

.footer-links {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 32px;
}

.footer-column h4 {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 16px;
    color: var(--bg-white);
}

.footer-column ul {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.footer-column a {
    color: var(--text-light);
    text-decoration: none;
    transition: color 0.3s ease;
    font-size: 15px;
}

.footer-column a:hover {
    color: var(--bg-white);
}

.footer-bottom {
    text-align: center;
    padding-top: 32px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-bottom p {
    color: var(--text-light);
    font-size: 14px;
}

.scroll-to-top {
    position: fixed;
    bottom: 32px;
    right: 32px;
    width: 48px;
    height: 48px;
    background: var(--primary-blue);
    color: var(--bg-white);
    border: none;
    border-radius: 50%;
    font-size: 24px;
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
    box-shadow: var(--shadow-lg);
    z-index: 999;
}

.scroll-to-top.visible {
    opacity: 1;
    visibility: visible;
}

.scroll-to-top:hover {
    background: var(--primary-blue-dark);
    transform: translateY(-2px);
}

@media (max-width: 968px) {
    .hero-content {
        grid-template-columns: 1fr;
        gap: 48px;
    }

    .hero-text h1 {
        font-size: 44px;
    }

    .hero-visual {
        order: -1;
    }

    .section-title {
        font-size: 36px;
    }

    .section-subtitle {
        font-size: 18px;
    }

    .footer-content {
        grid-template-columns: 1fr;
        gap: 48px;
    }

    .footer-links {
        grid-template-columns: repeat(3, 1fr);
    }
}

@media (max-width: 768px) {
    .mobile-menu-toggle {
        display: flex;
    }

    header nav {
        flex-wrap: wrap;
    }

    .nav-links {
        flex-basis: 100%;
        flex-direction: column;
        gap: 0;
        max-height: 0;
        overflow: hidden;
        transition: max-height 0.3s ease;
    }

    .nav-links.active {
        max-height: 400px;
        padding: 16px 0;
    }

    .nav-links li {
        width: 100%;
    }

    .nav-links a {
        display: block;
        padding: 12px 0;
    }

    header nav > .btn {
        margin-left: auto;
    }

    section {
        padding: 64px 0;
    }

    .hero {
        padding: 80px 0;
    }

    .hero-text h1 {
        font-size: 36px;
    }

    .hero-subtitle {
        font-size: 18px;
    }

    .hero-cta {
        flex-direction: column;
    }

    .hero-cta .btn {
        width: 100%;
    }

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

    .steps {
        grid-template-columns: 1fr;
        gap: 32px;
    }

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

    .security-statement {
        padding: 32px 24px;
    }

    .security-links {
        flex-direction: column;
        gap: 16px;
    }

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

    .section-title {
        font-size: 32px;
    }

    .contact-content h2 {
        font-size: 32px;
    }

    .contact-content p {
        font-size: 18px;
    }

    .contact-cta {
        flex-direction: column;
    }

    .contact-cta .btn {
        width: 100%;
    }

    .footer-links {
        grid-template-columns: 1fr;
    }

    .scroll-to-top {
        bottom: 24px;
        right: 24px;
        width: 44px;
        height: 44px;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 16px;
    }

    .hero-text h1 {
        font-size: 28px;
    }

    .section-title {
        font-size: 28px;
    }

    .feature-card,
    .security-item {
        padding: 24px;
    }

    .pricing-card {
        padding: 32px 24px;
    }
}