/* ===== VARIÁVEIS GLOBAIS ===== */
:root {
    --primary: #059669;
    --primary-dark: #047857;
    --primary-light: #6ece7b;
    --dark-bg: #0f172a;
    --dark-surface: #1e293b;
    --dark-border: #334155;
    --text-light: #e2e8f0;
    --text-muted: #94a3b8;
    --white: #ffffff;
    --black: #1e293b;
}

/* ===== ESTILOS GLOBAIS ===== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: system-ui, -apple-system, 'Segoe UI', Roboto, 'Helvetica Neue', sans-serif;
    line-height: 1.5;
    color: var(--black);
    background: linear-gradient(135deg, #ffffff 0%, #f8fafc 100%);
    background-attachment: fixed;
    min-height: 100vh;
}

.container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 2rem;
    width: 100%;
}

/* ===== TIPOGRAFIA ===== */
h1, h2, h3 {
    font-weight: 700;
    line-height: 1.2;
    letter-spacing: -0.02em;
}

h1 {
    font-size: clamp(2.5rem, 5vw, 3.5rem);
    margin-bottom: 1.5rem;
}

h2 {
    font-size: clamp(2rem, 4vw, 2.8rem);
    margin-bottom: 1rem;
    text-align: center;
    width: 100%;
}

h3 {
    font-size: 1.5rem;
    margin-bottom: 0.75rem;
}

.section-subtitle {
    font-size: clamp(1rem, 2vw, 1.125rem);
    color: #475569;
    max-width: 1000px;
    margin: 0 auto 3rem !important;
    text-align: center !important;
    line-height: 1.6;
    width: 100%;
    display: block;
}

/* ===== BOTÕES ===== */
.btn {
    display: inline-block;
    padding: 0.85rem 2rem;
    border-radius: 9999px;
    font-weight: 600;
    text-decoration: none;
    transition: all 0.2s ease;
    border: none;
    cursor: pointer;
    font-size: 1rem;
}

.btn-primary {
    background-color: var(--primary);
    color: var(--white);
    box-shadow: 0 4px 6px -1px rgba(5, 150, 105, 0.2);
}

.btn-primary:hover {
    background-color: var(--primary-dark);
    transform: scale(1.02);
}

.btn-outline {
    background-color: transparent;
    color: var(--black);
    border: 1.5px solid #cbd5e1;
}

.btn-outline:hover {
    border-color: var(--primary);
    background-color: #f0fdf4;
}

/* ===== HEADER ===== */
.header {
    padding: 1.5rem 0;
    position: sticky;
    top: 0;
    background-color: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(8px);
    border-bottom: 1px solid #e2e8f0;
    z-index: 1000;
}

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

.logo {
    display: flex;
    align-items: center;
    text-decoration: none;
}

.logo-img {
    height: 60px;
    width: auto;
    object-fit: contain;
}

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

.nav-links a {
    text-decoration: none;
    color: #000000;
    font-weight: 500;
    transition: color 0.2s;
}

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

.nav-actions {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-left: 2rem;
}

.btn-header {
    background-color: var(--primary-light);
    color: var(--white);
    padding: 0.6rem 1.5rem;
    border-radius: 9999px;
    font-weight: 600;
    text-decoration: none;
    white-space: nowrap;
}

.dark-mode-btn {
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    padding: 0 0.5rem;
    transition: transform 0.3s ease;
}

.dark-mode-btn:hover {
    transform: scale(1.1);
}

/* ===== SEÇÃO HERO ===== */
.hero {
    padding: 4rem 0 5rem;
    background: transparent;
}

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

.hero-content p {
    font-size: 1.25rem;
    color: #475569;
    margin-bottom: 2rem;
}

.hero-badge {
    display: inline-block;
    background-color: #f0fdf4;
    color: var(--primary-dark);
    padding: 0.35rem 1rem;
    border-radius: 9999px;
    font-weight: 600;
    font-size: 0.9rem;
    margin-bottom: 1.5rem;
}

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

/* ===== CARROSSEL ===== */
.hero-carousel {
    position: relative;
    width: 100%;
    height: 400px;
    border-radius: 2rem;
    overflow: hidden;
    box-shadow: 0 20px 25px -5px rgba(5, 150, 105, 0.2);
}

.carousel-container {
    position: relative;
    width: 100%;
    height: 100%;
}

.carousel-slide {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    opacity: 0;
    transition: opacity 0.5s ease-in-out;
    visibility: hidden;
}

.carousel-slide.active {
    opacity: 1;
    visibility: visible;
}

.carousel-image {
    width: 100%;
    height: 100%;
    background-size: cover;
    background-position: center;
    position: relative;
}

.carousel-image::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, rgba(255, 196, 0, 0.274), rgba(209, 193, 87, 0.3));
}

.carousel-btn {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    background: rgba(255, 255, 255, 0.3);
    color: var(--white);
    border: none;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    font-size: 24px;
    cursor: pointer;
    z-index: 10;
    backdrop-filter: blur(4px);
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
}

.carousel-btn:hover {
    background: rgba(255, 255, 255, 0.8);
    color: var(--primary);
    transform: translateY(-50%) scale(1.1);
}

.carousel-btn.prev {
    left: 20px;
}

.carousel-btn.next {
    right: 20px;
}

.carousel-dots {
    position: absolute;
    bottom: 20px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    gap: 10px;
    z-index: 10;
}

.dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.5);
    cursor: pointer;
    transition: all 0.3s ease;
}

.dot.active {
    background: var(--white);
    transform: scale(1.2);
    box-shadow: 0 0 10px rgba(255, 255, 255, 0.5);
}

.dot:hover {
    background: rgba(255, 255, 255, 0.9);
}

/* ===== SEÇÃO SOLUÇÕES ===== */
.section-solutions {
    padding: 5rem 0;
}

.section-solutions h2 {
    text-align: center;
    max-width: 900px;
    margin: 0 auto 1rem;
}

.solutions-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
    margin: 3rem auto 0;
}

.solution-card {
    background-color: var(--white);
    padding: 2.5rem 2rem;
    border-radius: 2rem;
    border: 1px solid #e2e8f0;
    transition: all 0.3s;
    position: relative;
}

.solution-card:hover {
    box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.05), 0 10px 10px -5px rgba(0, 0, 0, 0.01);
    border-color: #a7f3d0;
    transform: translateY(-4px);
}

.solution-card.featured {
    border: 2px solid var(--primary);
    transform: scale(1.02);
}

.solution-card.featured::before {
    content: "⭐ RECOMENDADO";
    position: absolute;
    top: -0.75rem;
    left: 2rem;
    background-color: var(--primary);
    color: var(--white);
    padding: 0.25rem 1rem;
    border-radius: 9999px;
    font-size: 0.8rem;
    font-weight: 600;
}

.solution-number {
    display: inline-block;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary);
    background-color: #f0fdf4;
    width: 3rem;
    height: 3rem;
    border-radius: 9999px;
    text-align: center;
    line-height: 3rem;
    margin-bottom: 1.5rem;
}

.solution-card h3 {
    font-size: 1.8rem;
    margin-bottom: 1rem;
}

.solution-price {
    font-size: 2.2rem;
    font-weight: 700;
    color: var(--black);
    margin: 1.5rem 0 0.5rem;
}

.solution-price small {
    font-size: 1rem;
    font-weight: 400;
    color: #64748b;
}

.solution-card ul {
    list-style: none;
    margin: 1.5rem 0 2rem;
}

.solution-card li {
    margin-bottom: 0.75rem;
    padding-left: 1.75rem;
    background-image: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" fill="%23059669" width="18px" height="18px"><path d="M9 16.17L4.83 12l-1.42 1.41L9 19 21 7l-1.41-1.41L9 16.17z"/></svg>');
    background-repeat: no-repeat;
    background-position: 0 3px;
    background-size: 18px;
}

.solution-card .btn {
    width: 100%;
    text-align: center;
    margin-top: 1rem;
}

/* ===== SEÇÃO COMO FUNCIONA ===== */
.section-howitworks {
    padding: 5rem 0;
    background: transparent;
}

.howitworks-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 2rem;
    margin-top: 3rem;
}

.howitworks-item {
    text-align: center;
}

.howitworks-number {
    display: inline-block;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--white);
    background-color: var(--primary);
    width: 3rem;
    height: 3rem;
    border-radius: 9999px;
    text-align: center;
    line-height: 3rem;
    margin-bottom: 1.5rem;
}

/* ===== SEÇÃO DETECÇÃO ===== */
.section-detection {
    padding: 5rem 0;
}

.detection-header {
    text-align: center;
    margin-bottom: 3rem;
    width: 100%;
}

.detection-header h2 {
    text-align: center;
    margin: 0 auto 1rem;
}

.detection-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 2rem;
    max-width: 900px;
    margin: 0 auto;
}

.detection-card {
    background-color: var(--white);
    padding: 2.5rem 2rem;
    border-radius: 2rem;
    border: 1px solid #e2e8f0;
    transition: all 0.3s;
    position: relative;
    text-align: left;
}

.detection-card:hover {
    box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.05), 0 10px 10px -5px rgba(0, 0, 0, 0.01);
    border-color: #a7f3d0;
    transform: translateY(-4px);
}

.detection-card.water {
    border-top: 4px solid #3b82f6;
}

.detection-card.kerosene {
    border-top: 4px solid #f59e0b;
}

.detection-card.featured {
    border: 2px solid var(--primary);
    transform: scale(1.02);
}

.detection-card.featured::before {
    content: "⭐ MAIS DETECTADO";
    position: absolute;
    top: -0.75rem;
    left: 2rem;
    background-color: var(--primary);
    color: var(--white);
    padding: 0.25rem 1rem;
    border-radius: 9999px;
    font-size: 0.8rem;
    font-weight: 600;
}

.detection-icon {
    font-size: 3rem;
    margin-bottom: 1.5rem;
    background-color: #f0fdf4;
    width: 4rem;
    height: 4rem;
    border-radius: 1rem;
    display: flex;
    align-items: center;
    justify-content: center;
}

.detection-icon.water {
    background-color: #dbeafe;
    color: #2563eb;
}

.detection-icon.kerosene {
    background-color: #fef3c7;
    color: #d97706;
}

.detection-card h3 {
    font-size: 2rem;
    margin-bottom: 0.5rem;
}

.detection-limit {
    display: inline-block;
    background-color: #f1f5f9;
    color: #475569;
    padding: 0.35rem 1rem;
    border-radius: 9999px;
    font-size: 0.9rem;
    font-weight: 600;
    margin: 0.5rem 0 1.5rem;
}

.detection-alert {
    background-color: #fef2f2;
    color: #b91c1c;
    padding: 1rem;
    border-radius: 1rem;
    margin-top: 1.5rem;
    font-weight: 500;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

/* ===== SEÇÃO TIPOS DE COMBUSTÍVEL ===== */
.section-fuels {
    padding: 5rem 0;
    background: transparent;
}

.fuels-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
    margin-top: 3rem;
}

.fuel-card {
    background-color: var(--white);
    padding: 2rem;
    border-radius: 2rem;
    border: 1px solid #e2e8f0;
    text-align: center;
    transition: all 0.3s;
}

.fuel-card:hover {
    border-color: var(--primary);
    transform: translateY(-4px);
}

.fuel-icon {
    font-size: 2.5rem;
    margin-bottom: 1rem;
    background-color: #f0fdf4;
    width: 4rem;
    height: 4rem;
    border-radius: 1rem;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1rem;
}

/* ===== SEÇÃO VANTAGENS ===== */
.section-benefits {
    padding: 5rem 0;
}

.benefits-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
    margin-top: 3rem;
}

.benefit-card {
    text-align: center;
    padding: 2rem;
    background-color: var(--white);
    border-radius: 2rem;
    border: 1px solid #e2e8f0;
    transition: all 0.3s;
}

.benefit-card:hover {
    border-color: #a7f3d0;
    transform: translateY(-4px);
}

.benefit-icon {
    font-size: 2.5rem;
    margin-bottom: 1rem;
    background-color: #f0fdf4;
    width: 4rem;
    height: 4rem;
    border-radius: 1rem;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1rem;
}

/* ===== SEÇÃO FAQ ===== */
.section-faq {
    padding: 5rem 0;
    background: transparent;
}

.faq-grid {
    max-width: 768px;
    margin: 3rem auto 0;
}

.faq-item {
    padding: 1.5rem 0;
    border-bottom: 1px solid #e2e8f0;
}

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

.faq-item summary::after {
    content: "▼";
    font-size: 0.8rem;
    color: var(--primary);
    transition: transform 0.3s;
}

.faq-item[open] summary::after {
    transform: rotate(180deg);
}

.faq-item p {
    margin-top: 1rem;
    color: #475569;
    padding-right: 2rem;
}

/* ===== RODAPÉ ===== */
.footer {
    background-color: #f1f5f9;
    padding: 3rem 0 1.5rem;
    border-top: 1px solid #e2e8f0;
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1.5fr;
    gap: 2rem;
    margin-bottom: 3rem;
}

.footer-logo {
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--black);
    margin-bottom: 1rem;
}

.footer-logo span {
    color: var(--primary);
}

.footer-col p {
    color: #475569;
    margin-bottom: 1rem;
}

.footer-col h4 {
    margin-bottom: 1rem;
}

.footer-col a {
    display: block;
    color: #475569;
    text-decoration: none;
    margin-bottom: 0.5rem;
}

.footer-col a:hover {
    color: var(--primary);
}

.footer-copyright {
    text-align: center;
    padding-top: 2rem;
    border-top: 1px solid #cbd5e1;
    color: #64748b;
}

/* ===== BOTÃO WHATSAPP ===== */
.whatsapp-float {
    position: fixed;
    width: 65px;
    height: 65px;
    bottom: 30px;
    right: 30px;
    background: linear-gradient(135deg, #25d366, #128C7E);
    color: var(--white);
    border-radius: 50%;
    text-align: center;
    font-size: 35px;
    box-shadow: 0 4px 15px rgba(37, 211, 102, 0.5);
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: center;
    text-decoration: none;
    transition: all 0.3s ease;
    animation: whatsapp-pulse 2s infinite;
    cursor: pointer;
}

.whatsapp-float i {
    font-size: 35px;
    line-height: 1;
    transition: all 0.3s ease;
}

.whatsapp-float:hover {
    transform: scale(1.1) translateY(-5px);
    background: linear-gradient(135deg, #128C7E, #075E54);
    box-shadow: 0 8px 25px rgba(37, 211, 102, 0.7);
}

.whatsapp-float:hover i {
    transform: rotate(5deg);
}

.whatsapp-tooltip {
    position: absolute;
    right: 80px;
    background: var(--dark-bg);
    color: var(--white);
    padding: 8px 15px;
    border-radius: 30px;
    font-size: 14px;
    font-weight: 500;
    white-space: nowrap;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
    pointer-events: none;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.2);
}

.whatsapp-tooltip::after {
    content: '';
    position: absolute;
    right: -8px;
    top: 50%;
    transform: translateY(-50%);
    border-left: 8px solid var(--dark-bg);
    border-top: 6px solid transparent;
    border-bottom: 6px solid transparent;
}

.whatsapp-float:hover .whatsapp-tooltip {
    opacity: 1;
    visibility: visible;
    right: 85px;
}

@keyframes whatsapp-pulse {
    0% { box-shadow: 0 0 0 0 rgba(37, 211, 102, 0.7); }
    70% { box-shadow: 0 0 0 15px rgba(37, 211, 102, 0); }
    100% { box-shadow: 0 0 0 0 rgba(37, 211, 102, 0); }
}

/* ===== MODO ESCURO ===== */
body.dark-mode {
    background: linear-gradient(135deg, var(--dark-bg) 0%, var(--dark-surface) 100%);
    color: var(--text-light);
}

body.dark-mode .header {
    background-color: rgba(15, 23, 42, 0.9);
    border-bottom-color: var(--dark-border);
}

body.dark-mode .nav-links a {
    color: var(--text-light);
}

body.dark-mode .solution-card,
body.dark-mode .detection-card,
body.dark-mode .fuel-card,
body.dark-mode .benefit-card,
body.dark-mode .contact-form,
body.dark-mode .contact-info {
    background-color: var(--dark-surface);
    border-color: var(--dark-border);
}

body.dark-mode .solution-card h3,
body.dark-mode .detection-card h3,
body.dark-mode .fuel-card h3,
body.dark-mode .benefit-card h3 {
    color: var(--white);
}

body.dark-mode .solution-price {
    color: var(--white);
}

body.dark-mode .solution-price small {
    color: var(--text-muted);
}

body.dark-mode .solution-card p,
body.dark-mode .detection-card p,
body.dark-mode .fuel-card p,
body.dark-mode .benefit-card p,
body.dark-mode .solution-card li,
body.dark-mode .detection-card li {
    color: var(--text-light);
}

body.dark-mode .solution-number {
    background-color: var(--dark-border);
    color: var(--primary-light);
}

body.dark-mode .detection-limit {
    background-color: var(--dark-border);
    color: var(--text-light);
}

body.dark-mode .detection-alert {
    background-color: #451a1a;
    color: #fecaca;
}

body.dark-mode h1,
body.dark-mode h2 {
    color: var(--white);
}

body.dark-mode .hero-badge {
    background-color: var(--dark-border);
    color: var(--primary-light);
}

body.dark-mode .section-subtitle {
    color: var(--text-muted);
}

body.dark-mode .footer {
    background-color: var(--dark-bg);
    border-top-color: var(--dark-border);
}

body.dark-mode .footer-logo {
    color: var(--white);
}

body.dark-mode .footer-logo span {
    color: var(--primary-light);
}

body.dark-mode .footer-col p,
body.dark-mode .footer-col a,
body.dark-mode .footer-copyright {
    color: var(--text-muted);
}

body.dark-mode .footer-col a:hover {
    color: var(--primary-light);
}

body.dark-mode .btn-outline {
    color: var(--text-light);
    border-color: var(--dark-border);
}

body.dark-mode .btn-outline:hover {
    background-color: var(--dark-border);
}

body.dark-mode .form-group input,
body.dark-mode .form-group select,
body.dark-mode .form-group textarea {
    background-color: var(--dark-surface);
    border-color: var(--dark-border);
    color: var(--text-light);
}

body.dark-mode .form-group label {
    color: var(--text-light);
}

body.dark-mode .faq-item {
    border-bottom-color: var(--dark-border);
}

body.dark-mode .faq-item summary {
    color: var(--white);
}

body.dark-mode .faq-item p {
    color: var(--text-light);
}

body.dark-mode .faq-item summary::after {
    color: var(--primary-light);
}

/* ===== RESPONSIVIDADE ===== */
@media (max-width: 1024px) {
    .solutions-grid,
    .fuels-grid,
    .benefits-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .container {
        padding: 0 1.5rem;
    }

    .hero .container,
    .detection-grid,
    .footer-grid {
        grid-template-columns: 1fr;
    }

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

    .howitworks-grid,
    .fuels-grid,
    .benefits-grid {
        grid-template-columns: 1fr;
        gap: 2rem;
    }

    .nav-links {
        display: none;
        flex-direction: column;
        width: 100%;
        margin-top: 1rem;
    }

    .nav-links.active {
        display: flex !important;
        position: absolute;
        top: 80px;
        left: 0;
        right: 0;
        background-color: var(--white);
        padding: 2rem;
        box-shadow: 0 10px 15px -3px rgba(0,0,0,0.1);
        border-bottom: 1px solid #e2e8f0;
        z-index: 100;
    }

    body.dark-mode .nav-links.active {
        background-color: var(--dark-surface);
    }

    .nav-actions {
        flex-direction: column;
        align-items: flex-start;
        gap: 1rem;
        margin-left: 0;
        width: 100%;
    }

    .btn-header {
        width: 100%;
        text-align: center;
    }

    .dark-mode-btn {
        align-self: flex-start;
    }

    .logo-img {
        height: 40px;
    }

    .whatsapp-float {
        width: 55px;
        height: 55px;
        font-size: 30px;
        bottom: 20px;
        right: 20px;
    }

    .whatsapp-float i {
        font-size: 30px;
    }

    .whatsapp-tooltip {
        display: none;
    }

    .hero-carousel {
        height: 300px;
        margin-top: 2rem;
    }

    .carousel-btn {
        width: 35px;
        height: 35px;
        font-size: 20px;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 1rem;
    }

    h1 {
        font-size: clamp(2rem, 6vw, 2.5rem);
    }

    h2 {
        font-size: clamp(1.5rem, 5vw, 2rem);
    }

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

    .detection-card {
        padding: 2rem 1.5rem;
    }
}
/* ===== BOTÃO VOLTAR AO TOPO ===== */
.back-to-top {
    position: fixed;
    bottom: 110px; /* Fica acima do WhatsApp */
    right: 30px;
    width: 50px;
    height: 50px;
    background-color: var(--primary);
    color: white;
    border: none;
    border-radius: 50%;
    font-size: 24px;
    font-weight: bold;
    cursor: pointer;
    display: none; /* Começa invisível */
    align-items: center;
    justify-content: center;
    z-index: 999;
    box-shadow: 0 4px 15px rgba(5, 150, 105, 0.3);
    transition: all 0.3s ease;
}

.back-to-top:hover {
    background-color: var(--primary-dark);
    transform: translateY(-5px);
    box-shadow: 0 6px 20px rgba(5, 150, 105, 0.4);
}

.back-to-top.show {
    display: flex; /* Mostra quando rolar */
}

/* Modo escuro */
body.dark-mode .back-to-top {
    background-color: var(--primary-light);
    color: var(--dark-bg);
    box-shadow: 0 4px 15px rgba(110, 206, 123, 0.3);
}

body.dark-mode .back-to-top:hover {
    background-color: #4fa85a;
}

/* Responsividade */
@media (max-width: 768px) {
    .back-to-top {
        bottom: 100px;
        right: 20px;
        width: 45px;
        height: 45px;
        font-size: 20px;
    }
}