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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    color: #ffffff;
    line-height: 1.6;
    background: #0a0a0a;
    -webkit-font-smoothing: antialiased;
}

/* ========== NAV ========== */
nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    padding: 0.6rem 1.5rem;
    z-index: 100;
    background: rgba(10, 10, 10, 0.85);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.06);
}

.nav-inner {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 0.95rem;
    font-weight: 800;
    color: #ffffff;
    letter-spacing: -0.02em;
}

.nav-btn {
    background: hsl(142, 71%, 45%);
    color: #fff;
    padding: 0.5rem 1rem;
    border-radius: 6px;
    text-decoration: none;
    font-weight: 600;
    font-size: 0.75rem;
    transition: background 0.3s, transform 0.2s;
}

.nav-btn:hover {
    background: hsl(142, 71%, 38%);
    transform: translateY(-1px);
}

/* ========== HERO ========== */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 6rem 1.5rem 3rem;
    background: radial-gradient(ellipse at top, #111 0%, #0a0a0a 70%);
}

.hero-content {
    max-width: 540px;
    text-align: center;
}

.hero h1 {
    font-size: 2.2rem;
    font-weight: 800;
    line-height: 1.15;
    letter-spacing: -0.03em;
    margin-bottom: 1.2rem;
}

.hero-subtitle {
    font-size: 1rem;
    color: #999;
    margin-bottom: 0.8rem;
    line-height: 1.6;
}

.hero-compatible {
    font-size: 0.8rem;
    color: #8a8a8a;
    margin-bottom: 2.5rem;
    letter-spacing: 0.05em;
    text-transform: uppercase;
}

/* ========== WHATSAPP MOCKUP ========== */
.mockup {
    background: #0b141a;
    border-radius: 16px;
    border: 1px solid #1a2730;
    overflow: hidden;
    margin-bottom: 2.5rem;
    text-align: left;
    box-shadow: 0 8px 40px rgba(0, 0, 0, 0.5);
    max-width: 360px;
    margin-left: auto;
    margin-right: auto;
}

.mockup-header {
    background: #1f2c34;
    padding: 0.45rem 0.6rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.mockup-header-left {
    display: flex;
    align-items: center;
    gap: 0.4rem;
}

.mockup-back {
    opacity: 0.6;
}

.mockup-header-right {
    opacity: 0.6;
}

.mockup-avatar {
    width: 28px;
    height: 28px;
    min-width: 28px;
    border-radius: 50%;
    background: #2a3942;
    display: flex;
    align-items: center;
    justify-content: center;
}

.mockup-header-info {
    display: flex;
    flex-direction: column;
    line-height: 1.2;
}

.mockup-name {
    font-size: 0.78rem;
    font-weight: 600;
    color: #e9edef;
}

.mockup-members {
    font-size: 0.6rem;
    color: #8696a0;
}

.mockup-chat {
    padding: 0.8rem 0.6rem;
    background: #0b141a;
    background-image: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23111b21' fill-opacity='0.4'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
    min-height: 120px;
}

.mockup-contact-name {
    font-size: 0.7rem;
    font-weight: 600;
    color: #53bdeb;
    margin-left: 0.8rem;
    margin-bottom: 0.2rem;
}

.mockup-bubble {
    background: #005c4b;
    border-radius: 0 8px 8px 8px;
    padding: 0.5rem 0.6rem;
    max-width: 88%;
    position: relative;
    color: #e9edef;
    margin-left: 0.2rem;
}

.mockup-bubble-tail {
    position: absolute;
    top: 0;
    left: -8px;
    width: 0;
    height: 0;
    border-top: 0px solid transparent;
    border-bottom: 10px solid transparent;
    border-right: 8px solid #005c4b;
}

.mockup-title {
    font-size: 0.7rem;
    font-weight: 700;
    color: #e9edef;
    margin-bottom: 0.3rem;
}

.mockup-row {
    font-size: 0.72rem;
    margin-bottom: 0.1rem;
    color: #d1d7db;
}

.mockup-row strong {
    color: #e9edef;
}

.mockup-meta {
    display: flex;
    align-items: center;
    justify-content: flex-end;
    gap: 0.25rem;
    margin-top: 0.2rem;
}

.mockup-time {
    font-size: 0.58rem;
    color: rgba(255, 255, 255, 0.45);
}

.mockup-check {
    opacity: 0.9;
}

/* ========== BUTTONS ========== */
.btn-primary {
    display: inline-block;
    background: hsl(142, 71%, 45%);
    color: #fff;
    padding: 0.85rem 2rem;
    border-radius: 10px;
    text-decoration: none;
    font-weight: 700;
    font-size: 0.95rem;
    transition: background 0.3s, transform 0.2s, box-shadow 0.3s;
    box-shadow: 0 4px 20px hsla(142, 71%, 45%, 0.25);
}

.btn-primary:hover {
    background: hsl(142, 71%, 38%);
    transform: translateY(-2px);
    box-shadow: 0 6px 28px hsla(142, 71%, 45%, 0.35);
}

.btn-large {
    padding: 1.1rem 2.8rem;
    font-size: 1.1rem;
}

/* ========== STEPS SECTION ========== */
.steps-section {
    background: #fafafa;
    color: #1a1a1a;
    padding: 5rem 1.5rem;
    text-align: center;
}

.steps-section h2 {
    font-size: 1.8rem;
    font-weight: 800;
    letter-spacing: -0.02em;
    margin-bottom: 3rem;
    color: #0a0a0a;
}

.steps {
    max-width: 500px;
    margin: 0 auto;
    text-align: left;
}

.step {
    display: flex;
    gap: 1.2rem;
    margin-bottom: 2.5rem;
    position: relative;
}

.step:not(:last-child)::after {
    content: '';
    position: absolute;
    left: 23px;
    top: 52px;
    width: 2px;
    height: calc(100% - 20px);
    background: #e0e0e0;
}

.step-number {
    width: 48px;
    height: 48px;
    min-width: 48px;
    border-radius: 50%;
    background: #0a0a0a;
    color: #fff;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    font-weight: 800;
    position: relative;
    z-index: 1;
}

.step-content h3 {
    font-size: 1.05rem;
    font-weight: 700;
    margin-bottom: 0.3rem;
    color: #0a0a0a;
}

.step-content p {
    font-size: 0.9rem;
    color: #666;
    line-height: 1.5;
}

.compatible-note {
    margin-top: 1rem;
    font-size: 0.8rem;
    color: #666;
    text-transform: uppercase;
    letter-spacing: 0.04em;
}

/* ========== COMMANDS SECTION ========== */
.commands-section {
    background: #0a0a0a;
    color: #fff;
    padding: 5rem 1.5rem;
    text-align: center;
}

.commands-section h2 {
    font-size: 1.8rem;
    font-weight: 800;
    letter-spacing: -0.02em;
    margin-bottom: 0.8rem;
}

.commands-intro {
    color: #888;
    font-size: 0.95rem;
    max-width: 450px;
    margin: 0 auto 2.5rem;
}

.commands-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 0.8rem;
    max-width: 500px;
    margin: 0 auto;
}

.command-card {
    background: #111;
    border: 1px solid #1a1a1a;
    border-radius: 10px;
    padding: 1rem 1.2rem;
    text-align: left;
    display: flex;
    align-items: center;
    gap: 1rem;
    transition: border-color 0.3s;
}

.command-card:hover {
    border-color: #333;
}

.command-name {
    font-family: 'Courier New', monospace;
    font-size: 0.8rem;
    font-weight: 700;
    color: #25d366;
    background: rgba(37, 211, 102, 0.08);
    padding: 0.3rem 0.6rem;
    border-radius: 6px;
    white-space: nowrap;
    min-width: fit-content;
}

.command-card p {
    color: #999;
    font-size: 0.82rem;
    margin: 0;
}

.commands-note {
    color: #777;
    font-size: 0.78rem;
    margin-top: 2rem;
}

/* ========== FAQ SECTION ========== */
.faq-section {
    background: #fafafa;
    color: #1a1a1a;
    padding: 5rem 1.5rem;
    text-align: center;
}

.faq-section h2 {
    font-size: 1.8rem;
    font-weight: 800;
    letter-spacing: -0.02em;
    margin-bottom: 2.5rem;
    color: #0a0a0a;
}

.faq-list {
    max-width: 600px;
    margin: 0 auto;
    text-align: left;
}

.faq-item {
    border-bottom: 1px solid #e5e5e5;
}

.faq-item summary {
    padding: 1.1rem 0;
    font-size: 0.95rem;
    font-weight: 600;
    color: #1a1a1a;
    cursor: pointer;
    list-style: none;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.faq-item summary::after {
    content: '+';
    font-size: 1.3rem;
    font-weight: 300;
    color: #888;
    transition: transform 0.3s;
}

.faq-item[open] summary::after {
    content: '−';
}

.faq-item summary::-webkit-details-marker {
    display: none;
}

.faq-item p {
    padding: 0 0 1.1rem;
    font-size: 0.88rem;
    color: #666;
    line-height: 1.6;
}

/* ========== CTA SECTION ========== */
.cta-section {
    background: #0a0a0a;
    color: #fff;
    padding: 5rem 1.5rem;
    text-align: center;
}

.cta-section h2 {
    font-size: 2rem;
    font-weight: 800;
    letter-spacing: -0.02em;
    margin-bottom: 1rem;
}

.cta-section p {
    color: #888;
    font-size: 1rem;
    max-width: 450px;
    margin: 0 auto 2rem;
}

/* ========== FOOTER ========== */
footer {
    background: #0a0a0a;
    text-align: center;
    padding: 1.5rem;
    border-top: 1px solid #161616;
}

footer p {
    color: #949494;
    font-size: 0.75rem;
}

.footer-inner {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

footer a {
    color: #949494;
    font-size: 0.75rem;
    text-decoration: none;
    transition: color 0.3s;
}

footer a:hover {
    color: #999;
}

/* ========== WHATSAPP FLOAT ========== */
.whatsapp-float {
    position: fixed;
    bottom: 20px;
    right: 20px;
    width: 56px;
    height: 56px;
    background: #25d366;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 4px 16px rgba(37, 211, 102, 0.4);
    transition: transform 0.3s, box-shadow 0.3s;
    z-index: 1000;
}

.whatsapp-float:hover {
    transform: scale(1.1);
    box-shadow: 0 6px 24px rgba(37, 211, 102, 0.5);
}

/* ========== ACCESSIBILITY ========== */
:focus-visible {
    outline: 2px solid #25d366;
    outline-offset: 2px;
}

/* ========== ANIMATIONS ========== */
.fade-in {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

/* ========== RESPONSIVE (DESKTOP) ========== */
@media (min-width: 768px) {
    nav {
        padding: 1.2rem 3rem;
    }

    .logo {
        font-size: 1.4rem;
    }

    .nav-btn {
        font-size: 0.8rem;
        padding: 0.5rem 1.3rem;
    }

    .hero {
        padding: 8rem 2rem 4rem;
    }

    .hero-content {
        max-width: 620px;
    }

    .hero h1 {
        font-size: 3.5rem;
    }

    .hero-subtitle {
        font-size: 1.15rem;
    }

    .hero-compatible {
        font-size: 0.85rem;
    }

    .mockup {
        max-width: 400px;
        margin-left: auto;
        margin-right: auto;
        margin-bottom: 3rem;
    }

    .steps-section {
        padding: 6rem 2rem;
    }

    .steps-section h2 {
        font-size: 2.2rem;
    }

    .steps {
        max-width: 550px;
    }

    .commands-section {
        padding: 6rem 2rem;
    }

    .commands-grid {
        grid-template-columns: 1fr 1fr;
        max-width: 650px;
    }

    .faq-section {
        padding: 6rem 2rem;
    }

    .cta-section {
        padding: 6rem 2rem;
    }

    .cta-section h2 {
        font-size: 2.5rem;
    }
}