:root {
    --primary-color: #25D366;
    --primary-dark: #128C7E;
    --text-dark: #1a1a1a;
    --text-light: #666;
    --bg-light: #f8f9fa;
}

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

html {
    scroll-behavior: smooth;
}

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

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

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

.nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 0;
}

.nav__logo {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 1.25rem;
    font-weight: 700;
}

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

.nav__link {
    color: var(--text-dark);
    text-decoration: none;
}

.nav__link:hover {
    color: var(--primary-color);
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    border-radius: 10px;
    text-decoration: none;
    font-weight: 600;
    transition: all 0.3s;
}

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

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

.hero {
    margin-top: 80px;
    padding: 4rem 0;
    background: linear-gradient(135deg, #f8f9fa 0%, #e9ecef 100%);
}

.hero__content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
    align-items: center;
}

.hero__title {
    font-size: 3rem;
    margin-bottom: 1.5rem;
}

.highlight {
    color: var(--primary-color);
}

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

.hero__cta {
    display: flex;
    gap: 1rem;
    margin-bottom: 2rem;
}

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

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

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

.hero__stats {
    display: flex;
    gap: 2rem;
}

.stat {
    text-align: center;
}

.stat__number {
    font-size: 2rem;
}

.stat__label {
    font-size: 0.9rem;
    color: var(--text-light);
}

.phone-mockup {
    background: #333;
    border-radius: 40px;
    padding: 15px;
    max-width: 300px;
    margin: 0 auto;
}

.phone-screen {
    background: #ECE5DD;
    border-radius: 25px;
    padding: 2rem 1rem;
    min-height: 500px;
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.chat-message {
    max-width: 75%;
    padding: 0.75rem 1rem;
    border-radius: 12px;
    font-size: 0.9rem;
}

.chat-message.received {
    background: white;
}

.chat-message.sent {
    background: #DCF8C6;
    align-self: flex-end;
}

.chat-message.audio {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.audio-wave {
    color: var(--primary-color);
    animation: wave 1s infinite;
}

@keyframes wave {
    0%, 100% { opacity: 0.5; }
    50% { opacity: 1; }
}

.features {
    padding: 6rem 0;
}

.section-title {
    font-size: 2.5rem;
    text-align: center;
    margin-bottom: 1rem;
}

.section-subtitle {
    text-align: center;
    font-size: 1.25rem;
    color: var(--text-light);
    margin-bottom: 4rem;
}

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

.feature-card {
    padding: 2rem;
    background: var(--bg-light);
    border-radius: 12px;
    text-align: center;
    transition: transform 0.3s;
}

.feature-card:hover {
    transform: translateY(-5px);
}

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

.feature-card h3 {
    margin-bottom: 1rem;
}

.how-it-works {
    padding: 6rem 0;
    background: var(--bg-light);
}

.steps {
    display: grid;
    gap: 2rem;
    margin-bottom: 3rem;
}

.step {
    display: flex;
    gap: 2rem;
    padding: 2rem;
    background: white;
    border-radius: 12px;
}

.step__number {
    flex-shrink: 0;
    width: 60px;
    height: 60px;
    background: var(--primary-color);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    font-weight: bold;
}

.step h3 {
    margin-bottom: 0.5rem;
}

.benefits {
    padding: 6rem 0;
}

.benefits__list {
    list-style: none;
    max-width: 700px;
    margin: 2rem auto 0;
}

.benefits__list li {
    display: flex;
    gap: 1rem;
    padding: 1rem 0;
    font-size: 1.1rem;
}

.check-icon {
    color: var(--primary-color);
    font-weight: bold;
}

.contact {
    padding: 6rem 0;
    background: var(--bg-light);
}

.whatsapp-card {
    max-width: 500px;
    margin: 0 auto;
    padding: 3rem;
    background: white;
    border-radius: 12px;
    text-align: center;
}

.whatsapp-icon {
    font-size: 5rem;
    margin-bottom: 1rem;
}

.whatsapp-card h3 {
    font-size: 2rem;
    margin-bottom: 1rem;
}

.whatsapp-card p {
    color: var(--text-light);
    margin-bottom: 2rem;
}

.btn-whatsapp {
    background: var(--primary-color);
    color: white;
    padding: 1.25rem 2.5rem;
    font-size: 1.2rem;
}

.footer {
    background: var(--text-dark);
    color: white;
    padding: 3rem 0 1.5rem;
}

.footer__content {
    text-align: center;
    margin-bottom: 2rem;
}

.footer__brand {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 0.5rem;
    font-size: 1.5rem;
    margin-bottom: 1rem;
}

.footer__text {
    color: rgba(255, 255, 255, 0.7);
}

.footer__bottom {
    text-align: center;
    padding-top: 2rem;
    border-top: 1px solid rgba(255, 255, 255, 0.2);
}

.footer__bottom p {
    color: rgba(255, 255, 255, 0.5);
}

/* Pricing Section */
.pricing {
    padding: 5rem 0;
    background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
}

.pricing__grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-top: 3rem;
}

.pricing-card {
    background: white;
    border-radius: 20px;
    padding: 2.5rem;
    box-shadow: 0 10px 30px rgba(0,0,0,0.1);
    position: relative;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.pricing-card:hover:not(.pricing-card--disabled) {
    transform: translateY(-10px);
    box-shadow: 0 20px 40px rgba(0,0,0,0.15);
}

.pricing-card--featured {
    border: 3px solid var(--primary-color);
}

.pricing-card--disabled {
    opacity: 0.6;
    pointer-events: none;
}

.pricing-badge {
    position: absolute;
    top: -15px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--text-light);
    color: white;
    padding: 0.5rem 1.5rem;
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 600;
}

.pricing-badge--featured {
    background: var(--primary-color);
}

.pricing-badge--soon {
    background: #ff9800;
}

.pricing-title {
    font-size: 1.8rem;
    margin: 1.5rem 0 1rem 0;
    text-align: center;
    color: var(--text-dark);
}

.pricing-toggle {
    display: flex;
    gap: 0.5rem;
    justify-content: center;
    margin: 1rem 0;
}

.toggle-btn {
    padding: 0.5rem 1.5rem;
    border: 2px solid var(--primary-color);
    background: white;
    color: var(--primary-color);
    border-radius: 25px;
    cursor: pointer;
    font-weight: 600;
    transition: all 0.3s ease;
}

.toggle-btn.active {
    background: var(--primary-color);
    color: white;
}

.pricing-price {
    text-align: center;
    margin: 2rem 0;
    min-height: 120px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}

.price-amount {
    font-size: 3rem;
    font-weight: 700;
    color: var(--primary-color);
}

.price-period {
    font-size: 1.2rem;
    color: var(--text-light);
}

.price-save {
    display: block;
    margin-top: 0.5rem;
    color: #ff9800;
    font-weight: 600;
    font-size: 0.9rem;
}

.pricing-features {
    list-style: none;
    margin: 2rem 0;
    padding: 0;
}

.pricing-features li {
    padding: 0.75rem 0;
    border-bottom: 1px solid #eee;
    color: var(--text-dark);
    font-size: 0.95rem;
}

.pricing-features li:last-child {
    border-bottom: none;
}

.pricing-card .btn {
    width: 100%;
    text-align: center;
    margin-top: 1.5rem;
}

.btn-outline {
    background: white;
    color: var(--primary-color);
    border: 2px solid var(--primary-color);
}

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

.btn-disabled {
    background: #ccc;
    color: #888;
    cursor: not-allowed;
}

.pricing-note {
    text-align: center;
    margin-top: 3rem;
    padding: 1.5rem;
    background: white;
    border-radius: 15px;
    box-shadow: 0 5px 15px rgba(0,0,0,0.05);
}

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

/* Mobile Optimizations */
@media (max-width: 768px) {
    /* Header */
    .nav__menu {
        display: none;
    }

    .header {
        padding: 0.75rem 0;
    }

    .nav__logo {
        font-size: 1.1rem;
    }
    
    /* Hero Section */
    .hero {
        padding: 3rem 0 2rem 0;
        margin-top: 60px;
    }

    .hero__content {
        grid-template-columns: 1fr;
        gap: 2rem;
    }
    
    .hero__title {
        font-size: 1.75rem;
        line-height: 1.3;
    }

    .hero__description {
        font-size: 1rem;
    }
    
    .hero__cta {
        flex-direction: column;
        gap: 1rem;
    }

    .btn-large {
        width: 100%;
        padding: 1rem 1.5rem;
        font-size: 1rem;
    }

    .hero__stats {
        gap: 1.5rem;
    }

    .stat__number {
        font-size: 2rem;
    }

    .stat__label {
        font-size: 0.9rem;
    }

    /* Features Section */
    .features {
        padding: 3rem 0;
    }

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

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

    .features__grid {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }

    .feature-card {
        padding: 1.5rem;
    }

    .feature-icon {
        font-size: 2.5rem;
    }

    /* How it Works */
    .how-it-works {
        padding: 3rem 0;
    }

    .step {
        flex-direction: column;
        padding: 1.5rem;
    }

    .step__number {
        font-size: 2rem;
        width: 50px;
        height: 50px;
        margin-bottom: 1rem;
    }

    .step__content h3 {
        font-size: 1.25rem;
    }

    /* Pricing Section */
    .pricing {
        padding: 3rem 0;
    }

    .pricing__grid {
        grid-template-columns: 1fr;
        gap: 2rem;
    }

    .pricing-card {
        padding: 2rem 1.5rem;
    }

    .pricing-title {
        font-size: 1.5rem;
    }

    .price-amount {
        font-size: 2.5rem;
    }

    .pricing-toggle {
        flex-wrap: wrap;
        gap: 0.75rem;
    }

    .toggle-btn {
        padding: 0.65rem 1.25rem;
        font-size: 0.95rem;
        min-width: 120px;
    }

    .pricing-features {
        font-size: 0.9rem;
    }

    .pricing-features li {
        padding: 0.65rem 0;
    }

    .pricing-note {
        margin-top: 2rem;
        padding: 1rem;
    }

    .pricing-note p {
        font-size: 0.85rem;
        line-height: 1.5;
    }

    /* Contact Section */
    .contact {
        padding: 3rem 0;
    }

    .whatsapp-card {
        padding: 2rem 1.5rem;
    }

    .whatsapp-icon {
        font-size: 3rem;
        width: 80px;
        height: 80px;
    }

    .whatsapp-card h3 {
        font-size: 1.25rem;
    }

    .whatsapp-card p {
        font-size: 0.95rem;
    }

    .btn-whatsapp {
        font-size: 1rem;
        padding: 0.9rem 2rem;
    }

    /* Footer */
    .footer {
        padding: 2rem 0 1.5rem 0;
        font-size: 0.9rem;
    }

    .footer__text {
        font-size: 0.95rem;
    }

    /* General Mobile Improvements */
    .container {
        padding: 0 1.25rem;
    }

    /* Make all buttons touch-friendly (minimum 44px height) */
    .btn {
        min-height: 44px;
        padding: 0.75rem 1.5rem;
    }

    /* Improve readability */
    body {
        font-size: 16px;
        line-height: 1.6;
    }

    /* Reduce spacing for mobile */
    section {
        margin: 0;
    }
}

/* Extra small devices (phones < 375px) */
@media (max-width: 375px) {
    .hero__title {
        font-size: 1.5rem;
    }

    .price-amount {
        font-size: 2rem;
    }

    .container {
        padding: 0 1rem;
    }

    .pricing-card {
        padding: 1.5rem 1rem;
    }
}