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

:root {
    --color-black: #000000;
    --color-white: #ffffff;
    --color-gray-light: #f5f5f5;
    --color-gray: #e0e0e0;
    --color-gray-dark: #666666;
    --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --transition: all 0.3s ease;
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 4rem;
    --spacing-xl: 6rem;
    --container-max-width: 1200px;
    --border-radius: 8px;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-primary);
    font-size: 16px;
    line-height: 1.6;
    color: var(--color-black);
    background-color: var(--color-white);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

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

/* Header */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background-color: var(--color-white);
    border-bottom: 1px solid var(--color-gray);
    z-index: 1000;
    transition: var(--transition);
}

.header.scrolled {
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
}

.nav {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-sm) var(--spacing-md);
    min-height: 70px;
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    text-decoration: none;
    color: var(--color-black);
    font-weight: 600;
    font-size: 1.25rem;
    transition: var(--transition);
}

.logo:hover {
    opacity: 0.8;
}

.logo-img {
    width: 40px;
    height: 40px;
    object-fit: contain;
    border-radius: 50%;
}

.logo-text {
    white-space: nowrap;
}

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

.nav-link {
    text-decoration: none;
    color: var(--color-black);
    font-weight: 400;
    transition: var(--transition);
    position: relative;
    padding: var(--spacing-xs) 0;
    white-space: nowrap;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--color-black);
    transition: var(--transition);
}

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

.nav-cta {
    margin-left: var(--spacing-md);
}

.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--spacing-xs);
}

.mobile-menu-toggle span {
    width: 25px;
    height: 2px;
    background-color: var(--color-black);
    transition: var(--transition);
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    text-decoration: none;
    border: 2px solid var(--color-black);
    background-color: var(--color-black);
    color: var(--color-white);
    font-weight: 500;
    font-size: 1rem;
    cursor: pointer;
    transition: var(--transition);
    border-radius: var(--border-radius);
    text-align: center;
}

.btn:hover {
    background-color: var(--color-white);
    color: var(--color-black);
}

.btn-secondary {
    background-color: var(--color-white);
    color: var(--color-black);
}

.btn-secondary:hover {
    background-color: var(--color-black);
    color: var(--color-white);
}

.btn-large {
    padding: 1rem 2rem;
    font-size: 1.1rem;
}

/* Hero Section */
.hero {
    padding: calc(70px + var(--spacing-xl)) var(--spacing-md) var(--spacing-xl);
    background-color: var(--color-white);
}

.hero .container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-xl);
    align-items: center;
}

.hero-content {
    max-width: 600px;
}

.hero-title {
    font-size: 3rem;
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: var(--spacing-md);
    color: var(--color-black);
}

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--color-gray-dark);
    margin-bottom: var(--spacing-lg);
    line-height: 1.6;
}

.hero-cta {
    display: flex;
    gap: var(--spacing-md);
    flex-wrap: wrap;
}

.hero-visual {
    display: flex;
    justify-content: center;
    align-items: center;
    position: relative;
}

.hero-circle {
    width: 300px;
    height: 300px;
    border-radius: 50%;
    border: 8px solid var(--color-black);
    position: relative;
    background-color: var(--color-white);
}

.hero-circle::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 200px;
    height: 200px;
    border-radius: 50%;
    border: 6px solid var(--color-white);
    background-color: var(--color-black);
}

.hero-circle::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 100px;
    height: 100px;
    border-radius: 50%;
    background-color: var(--color-white);
}

/* Sections */
.section {
    padding: var(--spacing-xl) var(--spacing-md);
}

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

.section-subtitle {
    font-size: 1.25rem;
    text-align: center;
    color: var(--color-gray-dark);
    margin-bottom: var(--spacing-lg);
}

.section-description {
    font-size: 1.1rem;
    text-align: center;
    color: var(--color-gray-dark);
    max-width: 800px;
    margin: 0 auto var(--spacing-lg);
    line-height: 1.8;
}

.section-cta {
    text-align: center;
    margin-top: var(--spacing-lg);
}

/* About Section */
.about {
    background-color: var(--color-gray-light);
}

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

.feature-card {
    text-align: center;
    padding: var(--spacing-md);
    background-color: var(--color-white);
    border-radius: var(--border-radius);
    border: 1px solid var(--color-gray);
}

.feature-icon {
    font-size: 3rem;
    margin-bottom: var(--spacing-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-black);
}

.feature-icon svg {
    width: 48px;
    height: 48px;
    color: var(--color-black);
}

.feature-card h3 {
    font-size: 1.25rem;
    margin-bottom: var(--spacing-sm);
    color: var(--color-black);
}

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

/* Features Grid */
.features-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-md);
    margin-top: var(--spacing-lg);
}

.feature-item {
    padding: var(--spacing-md);
    text-align: center;
    border: 1px solid var(--color-gray);
    border-radius: var(--border-radius);
    background-color: var(--color-white);
    transition: var(--transition);
}

.feature-item:hover {
    border-color: var(--color-black);
    transform: translateY(-5px);
}

.feature-item-icon {
    font-size: 2.5rem;
    margin-bottom: var(--spacing-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-black);
}

.feature-item-icon svg {
    width: 40px;
    height: 40px;
    color: var(--color-black);
}

.feature-item h3 {
    font-size: 1.1rem;
    margin-bottom: var(--spacing-xs);
    color: var(--color-black);
}

.feature-item p {
    color: var(--color-gray-dark);
    font-size: 0.95rem;
    line-height: 1.6;
}

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

.works-tabs {
    display: flex;
    justify-content: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-lg);
}

.tab-btn {
    padding: 0.75rem 2rem;
    border: 2px solid var(--color-black);
    background-color: var(--color-white);
    color: var(--color-black);
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    border-radius: var(--border-radius);
}

.tab-btn:hover,
.tab-btn.active {
    background-color: var(--color-black);
    color: var(--color-white);
}

.tab-content {
    display: none;
}

.tab-content.active {
    display: block;
}

.steps {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--spacing-md);
    margin-top: var(--spacing-lg);
}

.step {
    text-align: center;
    padding: var(--spacing-md);
}

.step-number {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    background-color: var(--color-black);
    color: var(--color-white);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    font-weight: 700;
    margin: 0 auto var(--spacing-sm);
    border: 3px solid var(--color-black);
}

.step h3 {
    font-size: 1.1rem;
    margin-bottom: var(--spacing-xs);
    color: var(--color-black);
}

.step p {
    color: var(--color-gray-dark);
    font-size: 0.95rem;
    line-height: 1.6;
}

/* Benefits */
.benefits-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-md);
    margin-top: var(--spacing-lg);
}

.benefit-item {
    padding: var(--spacing-md);
    text-align: center;
    border: 1px solid var(--color-gray);
    border-radius: var(--border-radius);
    background-color: var(--color-white);
    transition: var(--transition);
}

.benefit-item:hover {
    border-color: var(--color-black);
    transform: translateY(-5px);
}

.benefit-icon {
    font-size: 2.5rem;
    margin-bottom: var(--spacing-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-black);
}

.benefit-icon svg {
    width: 40px;
    height: 40px;
    color: var(--color-black);
}

.benefit-item h3 {
    font-size: 1.1rem;
    margin-bottom: var(--spacing-xs);
    color: var(--color-black);
}

.benefit-item p {
    color: var(--color-gray-dark);
    font-size: 0.95rem;
    line-height: 1.6;
}

/* Use Cases */
.use-cases {
    background-color: var(--color-gray-light);
}

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

.case-card {
    padding: var(--spacing-md);
    background-color: var(--color-white);
    border: 1px solid var(--color-gray);
    border-radius: var(--border-radius);
    transition: var(--transition);
}

.case-card:hover {
    border-color: var(--color-black);
    transform: translateY(-5px);
}

.case-card h3 {
    font-size: 1.25rem;
    margin-bottom: var(--spacing-xs);
    color: var(--color-black);
}

.case-card p {
    color: var(--color-gray-dark);
    line-height: 1.6;
}

/* FAQ */
.faq-list {
    max-width: 800px;
    margin: var(--spacing-lg) auto 0;
}

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

.faq-question {
    width: 100%;
    padding: var(--spacing-md);
    background: none;
    border: none;
    text-align: left;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 1.1rem;
    font-weight: 500;
    color: var(--color-black);
    transition: var(--transition);
}

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

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

.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: 0 var(--spacing-md) var(--spacing-md);
    color: var(--color-gray-dark);
    line-height: 1.8;
}

/* CTA Section */
.cta-section {
    background-color: var(--color-black);
    color: var(--color-white);
    text-align: center;
    padding: var(--spacing-xl) var(--spacing-md);
}

.cta-title {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
    color: var(--color-white);
}

.cta-description {
    font-size: 1.25rem;
    margin-bottom: var(--spacing-lg);
    color: var(--color-gray);
}

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

.cta-section .btn {
    border-color: var(--color-white);
    background-color: var(--color-white);
    color: var(--color-black);
}

.cta-section .btn:hover {
    background-color: var(--color-black);
    color: var(--color-white);
}

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

.cta-section .btn-secondary:hover {
    background-color: var(--color-white);
    color: var(--color-black);
}

/* Footer */
.footer {
    background-color: var(--color-gray-light);
    padding: var(--spacing-lg) var(--spacing-md) var(--spacing-md);
    border-top: 1px solid var(--color-gray);
}

.footer-content {
    display: grid;
    grid-template-columns: 2fr 3fr;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
}

.footer-brand {
    max-width: 300px;
}

.footer-description {
    margin-top: var(--spacing-sm);
    color: var(--color-gray-dark);
    line-height: 1.6;
}

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

.footer-column h4 {
    font-size: 1.1rem;
    margin-bottom: var(--spacing-sm);
    color: var(--color-black);
}

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

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

.footer-column ul li a {
    text-decoration: none;
    color: var(--color-gray-dark);
    transition: var(--transition);
}

.footer-column ul li a:hover {
    color: var(--color-black);
}

.footer-bottom {
    text-align: center;
    padding-top: var(--spacing-md);
    border-top: 1px solid var(--color-gray);
    color: var(--color-gray-dark);
}

/* Scroll to Top */
.scroll-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background-color: var(--color-black);
    color: var(--color-white);
    border: 2px solid var(--color-black);
    font-size: 1.5rem;
    cursor: pointer;
    display: none;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
    z-index: 999;
}

.scroll-top:hover {
    background-color: var(--color-white);
    color: var(--color-black);
}

.scroll-top.visible {
    display: flex;
}

/* Responsive Design */
@media (max-width: 1023px) {
    .hero .container {
        grid-template-columns: 1fr;
    }

    .hero-visual {
        order: -1;
    }

    .hero-circle {
        width: 250px;
        height: 250px;
    }

    .hero-circle::before {
        width: 160px;
        height: 160px;
    }

    .hero-circle::after {
        width: 80px;
        height: 80px;
    }

    .features-grid,
    .benefits-grid,
    .cases-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .steps {
        grid-template-columns: repeat(2, 1fr);
    }

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

@media (max-width: 767px) {
    .nav-menu {
        position: fixed;
        top: 70px;
        left: 0;
        right: 0;
        background-color: var(--color-white);
        flex-direction: column;
        padding: var(--spacing-md);
        border-bottom: 1px solid var(--color-gray);
        transform: translateX(-100%);
        transition: var(--transition);
        z-index: 999;
        margin-left: 0;
    }

    .nav-menu.active {
        transform: translateX(0);
    }

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

    .nav-cta {
        margin-left: 0;
        margin-top: var(--spacing-sm);
    }

    .hero {
        padding: calc(70px + var(--spacing-md)) var(--spacing-md) var(--spacing-md);
    }

    .hero-title {
        font-size: 2rem;
    }

    .hero-subtitle {
        font-size: 1.1rem;
    }

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

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

    .section {
        padding: var(--spacing-md);
    }

    .section-title {
        font-size: 2rem;
    }

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

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

    .works-tabs {
        flex-direction: column;
    }

    .tab-btn {
        width: 100%;
    }

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

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

    .scroll-top {
        bottom: 20px;
        right: 20px;
        width: 45px;
        height: 45px;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 1.75rem;
    }

    .section-title {
        font-size: 1.75rem;
    }

    .cta-title {
        font-size: 2rem;
    }
}