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

:root {
    --primary-color: #25D366;
    --primary-dark: #128C7E;
    --primary-light: #DCF8C6;
    --secondary-color: #34B7F1;
    --dark-bg: #0a1929;
    --text-dark: #1a1a1a;
    --text-light: #666;
    --white: #ffffff;
    --gray-bg: #f5f7fa;
    --shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    --gradient: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
}

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);
}

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

.navbar {
    position: fixed;
    top: 0;
    width: 100%;
    background: var(--white);
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    z-index: 1000;
    padding: 1rem 0;
}

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

.nav-brand h1 {
    color: var(--primary-color);
    font-size: 1.8rem;
    font-weight: 700;
}

.nav-links {
    display: flex;
    gap: 2rem;
    align-items: center;
}

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

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

.btn-nav {
    background: var(--gradient);
    color: var(--white) !important;
    padding: 0.6rem 1.5rem;
    border-radius: 25px;
}

.hero {
    padding: 120px 0 80px;
    background: linear-gradient(135deg, #f5f7fa 0%, #ffffff 100%);
}

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

.hero-title {
    font-size: 3rem;
    font-weight: 700;
    color: var(--text-dark);
    margin-bottom: 1.5rem;
    line-height: 1.2;
}

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--text-light);
    margin-bottom: 2rem;
}

.hero-buttons {
    display: flex;
    gap: 1rem;
}

.btn {
    display: inline-block;
    padding: 1rem 2rem;
    border-radius: 30px;
    text-decoration: none;
    font-weight: 600;
    transition: all 0.3s;
    cursor: pointer;
    border: none;
}

.btn-primary {
    background: var(--gradient);
    color: var(--white);
    box-shadow: 0 4px 15px rgba(37, 211, 102, 0.3);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(37, 211, 102, 0.4);
}

.btn-secondary {
    background: transparent;
    color: var(--primary-dark);
    border: 2px solid var(--primary-color);
}

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

.btn-large {
    padding: 1.2rem 2.5rem;
    font-size: 1.1rem;
}

.phone-mockup {
    width: 300px;
    height: 600px;
    background: var(--text-dark);
    border-radius: 40px;
    padding: 15px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
    margin: 0 auto;
}

.phone-screen {
    background: #ece5dd;
    height: 100%;
    border-radius: 30px;
    padding: 20px;
    display: flex;
    flex-direction: column;
    gap: 10px;
    justify-content: center;
}

.chat-bubble {
    max-width: 80%;
    padding: 12px 16px;
    border-radius: 10px;
    animation: fadeIn 0.5s ease;
}

.chat-bubble.received {
    background: var(--white);
    align-self: flex-start;
}

.chat-bubble.sent {
    background: var(--primary-light);
    align-self: flex-end;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.section-title {
    font-size: 2.5rem;
    font-weight: 700;
    text-align: center;
    margin-bottom: 3rem;
    color: var(--text-dark);
}

.features {
    padding: 80px 0;
    background: var(--white);
}

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

.feature-card {
    background: var(--white);
    padding: 2rem;
    border-radius: 20px;
    box-shadow: var(--shadow);
    transition: transform 0.3s;
    text-align: center;
}

.feature-card:hover {
    transform: translateY(-10px);
}

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

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

.feature-card p {
    color: var(--text-light);
}

.how-it-works {
    padding: 80px 0;
    background: var(--gray-bg);
}

.steps {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1rem;
}

.step {
    flex: 1;
    min-width: 200px;
    text-align: center;
}

.step-number {
    width: 60px;
    height: 60px;
    background: var(--gradient);
    color: var(--white);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    font-weight: 700;
    margin: 0 auto 1rem;
}

.step-content h3 {
    font-size: 1.3rem;
    margin-bottom: 0.5rem;
    color: var(--text-dark);
}

.step-content p {
    color: var(--text-light);
    font-size: 0.95rem;
}

.step-arrow {
    font-size: 2rem;
    color: var(--primary-color);
    font-weight: 700;
}

.use-cases {
    padding: 80px 0;
    background: var(--white);
}

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

.use-case {
    background: var(--gradient);
    color: var(--white);
    padding: 2rem;
    border-radius: 20px;
    text-align: center;
    transition: transform 0.3s;
}

.use-case:hover {
    transform: scale(1.05);
}

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

.use-case h3 {
    font-size: 1.2rem;
}

.cta {
    padding: 80px 0;
    background: var(--gradient);
    color: var(--white);
}

.cta-content {
    text-align: center;
}

.cta h2 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

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

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

.cta .btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
}

.footer {
    background: var(--dark-bg);
    color: var(--white);
    padding: 3rem 0 1rem;
}

.footer-content {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: 3rem;
    margin-bottom: 2rem;
}

.footer-brand h3 {
    color: var(--primary-color);
    margin-bottom: 0.5rem;
}

.footer-brand p {
    opacity: 0.7;
}

.footer-links {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 2rem;
}

.footer-column h4 {
    margin-bottom: 1rem;
    color: var(--primary-color);
}

.footer-column a {
    display: block;
    color: var(--white);
    text-decoration: none;
    opacity: 0.7;
    margin-bottom: 0.5rem;
    transition: opacity 0.3s;
}

.footer-column a:hover {
    opacity: 1;
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding-top: 1rem;
    text-align: center;
    opacity: 0.7;
}

@media (max-width: 768px) {
    .nav-links {
        gap: 1rem;
    }

    .hero-content {
        grid-template-columns: 1fr;
        text-align: center;
    }

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

    .hero-subtitle {
        font-size: 1rem;
    }

    .hero-buttons {
        justify-content: center;
        flex-wrap: wrap;
    }

    .phone-mockup {
        width: 250px;
        height: 500px;
    }

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

    .steps {
        flex-direction: column;
    }

    .step-arrow {
        transform: rotate(90deg);
    }

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

    .cta h2 {
        font-size: 1.8rem;
    }
}