:root {
  --bg: #0f1720;
  --panel: rgba(22,33,44,.88);
  --panel-border: rgba(34,49,64,.68);
  --text: #e8edf2;
  --muted: #b1c1d6;
  --accent: #4fd1c5;
  --accent2: #f6ad55;
  --warn: #f56565;
  --ok: #68d391;
  --shadow: 0 32px 90px -46px rgba(0,0,0,.6);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

html, body {
  margin: 0;
  min-height: 100%;
  background: #08101b;
  color: var(--text);
  font-family: Inter, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  overflow-x: hidden;
}

body {
  position: relative;
}

a {
  color: inherit;
  text-decoration: none;
}

img {
  max-width: 100%;
  display: block;
}

button, input, select {
  font: inherit;
}

button {
  cursor: pointer;
}

nav {
  position: fixed;
  inset: 0 0 auto;
  z-index: 50;
  height: 72px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 6vw;
  background: rgba(15,23,32,.78);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(34,49,64,.75);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 800;
  font-size: 1rem;
  letter-spacing: -.02em;
}

.brand span {
  background: linear-gradient(90deg, var(--accent), var(--accent2));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.nav-action {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 24px;
  border-radius: 999px;
  font-weight: 700;
  font-size: 0.94rem;
  color: #09231b;
  background: linear-gradient(90deg, var(--accent), #38b8ac);
  box-shadow: 0 18px 42px -18px rgba(79,209,197,.75);
  transition: transform .2s ease, box-shadow .2s ease;
}

.nav-action:hover {
  transform: translateY(-2px);
  box-shadow: 0 20px 48px -16px rgba(79,209,197,.85);
}

main {
  position: relative;
  z-index: 1;
}

.hero {
  position: relative;
  min-height: 92vh;
  display: grid;
  align-items: center;
  justify-items: center;
  padding: calc(72px + 40px) 6vw 80px;
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  inset: 0;
  z-index: 0;
  background-image:
    radial-gradient(1200px 700px at 82% -10%, rgba(79,209,197,.10), transparent 60%),
    linear-gradient(180deg, rgba(11,18,26,.58) 0%, rgba(15,23,32,.38) 55%, rgba(10,17,25,.24) 100%),
    url("../img/hero.webp");
  background-size: auto, auto, cover;
  background-position: center, center, center;
  background-repeat: no-repeat, no-repeat, no-repeat;
  background-blend-mode: normal, normal, overlay;
  filter: saturate(1.12) brightness(1.2) contrast(1.08);
}

.hero-overlay {
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at 50% -10%, rgba(255,255,255,.25), transparent 26%),
              radial-gradient(circle at 18% 18%, rgba(79,209,197,.12), transparent 18%),
              radial-gradient(circle at 82% 16%, rgba(246,173,85,.12), transparent 20%);
  pointer-events: none;
}

.hero .fundo {
  position: absolute;
  inset: 0;
  z-index: 1;
  pointer-events: none;
}

.hero .rede {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 34vh;
  min-height: 200px;
  transform: perspective(900px) rotateX(48deg);
  transform-origin: bottom;
  opacity: .8;
  overflow: hidden;
  background-image:
    linear-gradient(rgba(79,209,197,.16) 1px, transparent 1px),
    linear-gradient(90deg, rgba(79,209,197,.16) 1px, transparent 1px);
  background-size: 56px 56px;
}

.hero .rede::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(15,23,32,0) 0%, rgba(15,23,32,.55) 100%);
  pointer-events: none;
  z-index: 1;
}

.hero .rede::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image: radial-gradient(circle, rgba(79,209,197,.55) 1.5px, transparent 1.6px);
  background-size: 56px 56px;
  animation: pulsarNos 3s ease-in-out infinite;
}

.hero .fatura-img {
  position: absolute;
  top: calc(72px + 40px);
  right: 7%;
  width: 208px;
  background: rgba(22,33,44,.62);
  border: 1.5px solid rgba(79,209,197,.4);
  border-radius: 10px;
  padding: 16px 16px 14px;
  backdrop-filter: blur(4px);
  box-shadow: 0 24px 50px -22px rgba(0,0,0,.65), 0 0 40px -12px rgba(79,209,197,.3);
  animation: flutuarFatura 6s ease-in-out infinite;
}

.hero .fatura-img::before {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: 0;
  height: 0;
  border-style: solid;
  border-width: 0 15px 15px 0;
  border-color: transparent rgba(15,23,32,.92) transparent transparent;
}

.fatura-cabecalho {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 12px;
}

.fatura-logo {
  flex: none;
  width: 15px;
  height: 15px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--accent), var(--accent2));
}

.fatura-titulo {
  flex: 1;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: .02em;
  text-transform: uppercase;
  color: rgba(232,237,242,.85);
  white-space: nowrap;
}

.fatura-linha {
  height: 6px;
  border-radius: 3px;
  background: rgba(146,163,180,.3);
  margin-bottom: 8px;
}

.fatura-total {
  margin-top: 10px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: rgba(246,173,85,.14);
  border: 1px solid rgba(246,173,85,.35);
  border-radius: 6px;
  padding: 7px 10px;
}

.fatura-total .rotulo {
  font-size: 9px;
  letter-spacing: .05em;
  color: var(--accent2);
  font-weight: 700;
  text-transform: uppercase;
}

.fatura-total .valor {
  font-size: 11.5px;
  font-weight: 800;
  color: var(--text);
}

.fatura-total .valor-numero {
  filter: blur(4px);
  user-select: none;
}

.fatura-barras {
  margin-top: 12px;
  height: 16px;
  border-radius: 2px;
  opacity: .55;
  background: repeating-linear-gradient(90deg, rgba(232,237,242,.6) 0 2px, transparent 2px 5px, rgba(232,237,242,.3) 5px 6px, transparent 6px 9px);
}

.particulas {
  position: absolute;
  inset: 0;
  pointer-events: none;
}

.particula {
  position: absolute;
  width: calc(var(--tam, 4px) * 1.4);
  height: calc(var(--tam, 4px) * 1.4);
  border-radius: 50%;
  background: var(--cor, var(--accent));
  box-shadow: 0 0 10px 1px var(--cor, var(--accent));
  opacity: 0;
  transform-origin: center;
  animation: cairVerificacao var(--duracao, 3.5s) linear var(--atraso, 0s) infinite;
}

.particula::before,
.particula::after {
  content: "";
  position: absolute;
  inset: -55%;
  border-radius: 999px;
  background: inherit;
  transform: rotate(45deg);
  opacity: .8;
}

.particula::after {
  transform: rotate(-45deg);
}

@keyframes cairVerificacao {
  0% { transform: translate(0, 0) scale(.65) rotate(0deg); opacity: 0; }
  12% { opacity: 1; }
  78% { opacity: .95; }
  100% { transform: translate(var(--dx, 25vw), var(--dy, 55vh)) scale(.15) rotate(180deg); opacity: 0; }
}

@media (prefers-reduced-motion: reduce) {
  .hero .rede::after,
  .hero .fatura-img,
  .particula {
    animation: none !important;
  }

  .flip-card-inner {
    transition: none !important;
  }
}

@keyframes pulsarNos {
  0%, 100% { opacity: .35; }
  50% { opacity: 1; }
}

.hero-content {
  position: relative;
  z-index: 2;
  max-width: 760px;
  width: min(100%, 760px);
  text-align: center;
  padding: 28px 34px 42px;
  background: rgba(8,14,20,0.72);
  border-radius: 14px;
  box-shadow: 0 10px 30px rgba(0,0,0,0.45);
  backdrop-filter: blur(6px);
}

.hero-heading {
  display: block;
  width: 100%;
  text-align: center;
  padding: 0;
  margin: 0 0 24px;
  background: none;
  border: none;
  border-radius: 0;
  box-shadow: none;
  backdrop-filter: none;
}

.hero-copy {
  margin: 0 auto 18px;
  max-width: 60ch;
  color: rgba(232, 237, 242, .98);
  font-size: clamp(16px, 1.2vw, 20px);
  line-height: 1.6;
}

.hero-actions {
  margin-top: 18px;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin: 0 auto 18px;
  padding: 8px 18px;
  border-radius: 999px;
  background: rgba(104,211,145,.14);
  border: 1px solid rgba(104,211,145,.38);
  color: var(--ok);
  font-size: 0.85rem;
  font-weight: 700;
  letter-spacing: .02em;
}

.hero-nota {
  margin: 14px auto 0;
  max-width: 46ch;
  color: var(--muted);
  font-size: 0.85rem;
}

.hero h1 {
  margin: 0;
  font-size: clamp(34px, 5.6vw, 64px);
  line-height: 1.08;
  font-weight: 800;
  letter-spacing: -.04em;
  text-shadow: 0 18px 50px rgba(0,0,0,.24);
  max-width: 100%;
  overflow-wrap: break-word;
  word-break: break-word;
}

.hero-line {
  display: inline-block;
  white-space: nowrap;
}

/* Focus styles for accessibility */
.nav-action:focus,
.button-primary:focus {
  outline: 3px solid rgba(79,209,197,.25);
  outline-offset: 2px;
}

@media (max-width: 900px) {
  .hero h1 { font-size: clamp(32px, 6.0vw, 60px); line-height: 1.08; }
  .hero-content { padding-left: 24px; padding-right: 24px; }
  .hero-copy { font-size: clamp(15px, 2.2vw, 18px); }
}

@media (max-width: 720px) {
  .hero {
    min-height: auto;
    padding: calc(72px + 20px) 4vw 60px;
  }

  .hero-content {
    max-width: 94vw;
    padding: 22px 18px 36px;
  }

  .hero h1 {
    font-size: clamp(28px, 8vw, 48px);
    line-height: 1.12;
    max-width: 100%;
  }

  .hero-copy {
    margin: 0 auto 18px;
    max-width: 100%;
    font-size: 16px;
    line-height: 1.7;
  }

  .hero-actions {
    margin-top: 20px;
    width: 100%;
  }

  .button-primary {
    width: 100%;
    padding: 16px 20px;
  }

  .hero .fatura-img {
    display: none;
  }
}

.hero-accent {
  background: linear-gradient(90deg, var(--accent), var(--accent2));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.hero h1,
.hero-copy {
  text-shadow: 0 18px 40px rgba(0,0,0,.28);
}

.hero-actions {
  display: flex;
  justify-content: center;
  gap: 14px;
  flex-wrap: wrap;
}

.section {
  padding: 84px 6vw;
  position: relative;
}

.largura {
  max-width: 1080px;
  margin: 0 auto;
}

.section-title {
  text-align: center;
  max-width: 680px;
  margin: 0 auto 42px;
}

.section-title .label {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: var(--accent);
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: .08em;
  text-transform: uppercase;
  margin-bottom: 12px;
}

.section-title h2 {
  margin: 0;
  font-size: clamp(26px, 3.4vw, 36px);
  line-height: 1.18;
}

.section-title p {
  margin: 18px auto 0;
  max-width: 700px;
  color: var(--muted);
  line-height: 1.7;
  font-size: 1rem;
}

.reveal-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-top: 20px;
  padding: 10px 20px;
  border: 1px solid rgba(79,209,197,.35);
  border-radius: 999px;
  background: rgba(79,209,197,.1);
  color: var(--accent);
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: .06em;
  text-transform: uppercase;
  cursor: pointer;
  transition: background-color .2s ease, transform .2s ease, box-shadow .2s ease;
}

.reveal-btn:hover {
  background: rgba(79,209,197,.22);
  transform: translateY(-2px);
  box-shadow: 0 12px 28px -14px rgba(79,209,197,.6);
}

.reveal-btn-icon {
  display: inline-block;
  transition: transform .5s ease;
}

.reveal-btn.girando .reveal-btn-icon {
  transform: rotate(360deg);
}

.problema-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 18px;
}

/* === Cards "revelação" (flip 3D), inspirado em aieng.sandeco.com.br/cap06 ===
   Cada card começa fechado (nº grande) e vira em cascata ao entrar na tela
   ou ao clicar "Revelar cards" — ver revelarProblemaCards() em js/script.js.
   O lado de trás reaproveita 100% o visual/CSS de .problema-card já existente
   (mesma classe, ver markup em index.html), só ganhando posicionamento
   absoluto do flip. */
.flip-card {
  perspective: 1400px;
  height: 100%;
}

.flip-card-inner {
  position: relative;
  width: 100%;
  height: 100%;
  min-height: 250px;
  transition: transform 1.3s cubic-bezier(.34,1.15,.64,1);
  transform-style: preserve-3d;
}

.flip-card.flipped .flip-card-inner {
  transform: rotateY(180deg);
}

.flip-card-front,
.flip-card-back {
  position: absolute;
  inset: 0;
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
  border-radius: 18px;
}

.flip-card-front {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 6px;
  background: linear-gradient(135deg, rgba(79,209,197,.16), rgba(246,173,85,.08));
  border: 1px solid rgba(79,209,197,.3);
  box-shadow: 0 6px 24px -10px rgba(79,209,197,.3);
}

.flip-front-icon {
  font-size: 1.7rem;
  opacity: .85;
}

.flip-front-number {
  font-size: 3rem;
  line-height: 1;
  font-weight: 800;
  color: var(--accent2);
  text-shadow: 0 0 26px rgba(246,173,85,.55);
  letter-spacing: 1px;
}

.flip-front-label {
  font-size: .68rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .22em;
  color: var(--muted);
}

.flip-card-back {
  transform: rotateY(180deg);
  overflow: auto;
}

.problema-card {
  display: flex;
  gap: 16px;
  align-items: flex-start;
  padding: 22px;
  border-radius: 18px;
  background: rgba(24,38,55,.8);
  border: 1px solid rgba(79,209,197,.12);
  box-shadow: var(--shadow);
  transition: box-shadow .3s ease, border-color .3s ease, background-color .3s ease;
}

.problema-card:hover {
  border-color: rgba(79,209,197,.4);
  background: rgba(28,44,62,.9);
  box-shadow: 0 32px 70px -30px rgba(0,0,0,.65), 0 0 32px -10px rgba(79,209,197,.3);
}

.problema-card .icon {
  width: 42px;
  height: 42px;
  border-radius: 14px;
  display: grid;
  place-items: center;
  font-size: 1.3rem;
  background: rgba(79,209,197,.15);
  transition: transform .3s ease, background-color .3s ease;
}

.problema-card:hover .icon {
  transform: scale(1.12) rotate(-4deg);
  background: rgba(79,209,197,.28);
}

.problema-card h3 {
  margin: 0 0 8px;
  font-size: 1rem;
}

.problema-card strong {
  display: block;
  margin-bottom: 8px;
  color: #f8c68f;
}

.problema-card p {
  margin: 0;
  color: var(--muted);
  line-height: 1.7;
  font-size: 0.95rem;
}

.steps-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 26px;
}

.step {
  padding-left: 12px;
  position: relative;
  transition: transform .3s ease;
}

.step:hover {
  transform: translateX(4px);
}

.step:hover .step-number {
  transform: scale(1.1);
  box-shadow: 0 12px 30px -10px rgba(79,209,197,.55);
}

.step::before {
  content: "";
  position: absolute;
  left: 0;
  top: 8px;
  width: 4px;
  height: calc(100% - 8px);
  background: linear-gradient(180deg, rgba(79,209,197,.65), rgba(246,173,85,.45));
  border-radius: 999px;
}

.step-number {
  width: 44px;
  height: 44px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  margin-bottom: 18px;
  font-weight: 800;
  color: var(--bg);
  background: linear-gradient(135deg, var(--accent), var(--accent2));
  transition: transform .3s ease, box-shadow .3s ease;
}

.step h4 {
  margin: 0 0 12px;
  font-size: 1rem;
}

.step p {
  margin: 0;
  color: var(--muted);
  line-height: 1.75;
}

.form-section {
  background: radial-gradient(circle at 50% 0%, rgba(79,209,197,.08), transparent 42%);
}

.form-card {
  max-width: 700px;
  margin: 0 auto;
  padding: 42px clamp(22px, 3vw, 48px);
  border-radius: 24px;
  background: rgba(20,31,44,.94);
  border: 1px solid rgba(79,209,197,.12);
  box-shadow: var(--shadow);
}

.field {
  margin-bottom: 20px;
}

.field label {
  display: block;
  margin-bottom: 8px;
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--muted);
}

.field input,
.field select {
  width: 100%;
  border: 1px solid rgba(255,255,255,.08);
  background: rgba(13,24,36,.95);
  color: var(--text);
  border-radius: 14px;
  padding: 14px 16px;
  transition: border-color .2s ease, box-shadow .2s ease;
}

.field input::placeholder {
  color: #5c7289;
}

.field input:focus,
.field select:focus {
  outline: none;
  border-color: rgba(79,209,197,.7);
  box-shadow: 0 0 0 3px rgba(79,209,197,.12);
}

.field-row {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
}

.button-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  padding: 16px 22px;
  border: none;
  border-radius: 999px;
  background: linear-gradient(90deg, var(--accent), #38b8ac);
  font-size: 1rem;
  font-weight: 800;
  color: #08211d;
  box-shadow: 0 16px 40px -18px rgba(79,209,197,.7);
  transition: transform .2s ease, box-shadow .2s ease;
}

.button-primary:hover,
.button-primary:focus-visible {
  transform: translateY(-2px);
  box-shadow: 0 18px 48px -16px rgba(79,209,197,.85);
}

.notice {
  display: flex;
  gap: 12px;
  align-items: flex-start;
  margin: 26px 0 0;
  padding: 16px 18px;
  border-radius: 16px;
  background: rgba(104,211,145,.1);
  border: 1px solid rgba(104,211,145,.24);
}

/* Seção "planos" (o que vem depois do grátis) — ver comentário em
   index.html, docs/estrategia_comercializacao.md seção 3.3. */
.planos-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 24px;
  max-width: 860px;
  margin: 0 auto;
}

.plano-card {
  padding: 28px 26px;
  border-radius: 18px;
  background: var(--panel);
  border: 1px solid var(--panel-border);
  text-align: left;
}

.plano-card-destaque {
  border-color: rgba(79,209,197,.45);
  box-shadow: 0 24px 60px -34px rgba(79,209,197,.5);
}

.plano-selo {
  display: inline-block;
  padding: 5px 12px;
  border-radius: 999px;
  background: rgba(79,209,197,.14);
  border: 1px solid rgba(79,209,197,.35);
  color: var(--accent);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: .02em;
  margin-bottom: 14px;
}

.plano-selo-gratis {
  background: rgba(104,211,145,.14);
  border-color: rgba(104,211,145,.38);
  color: var(--ok);
}

.plano-card h3 {
  margin: 0 0 16px;
  font-size: 1.2rem;
}

.plano-card ul {
  margin: 0;
  padding-left: 20px;
  color: var(--muted);
  line-height: 1.8;
}

.plano-nota {
  margin: 16px 0 0;
  font-size: 0.85rem;
  color: var(--muted);
}

/* Seção FAQ — ver comentário em index.html, seção 3.5 do mesmo documento. */
.faq-lista {
  max-width: 760px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.faq-item {
  padding: 22px 4px;
  border-bottom: 1px solid var(--panel-border);
  text-align: left;
}

.faq-item:first-child {
  border-top: 1px solid var(--panel-border);
}

.faq-item h3 {
  margin: 0 0 10px;
  font-size: 1.05rem;
}

.faq-item p {
  margin: 0;
  color: var(--muted);
  line-height: 1.7;
}

.faq-item a {
  color: var(--accent);
  text-decoration: underline;
}

.notice .icon {
  width: 32px;
  height: 32px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  background: rgba(104,211,145,.14);
  color: var(--ok);
  font-size: 1.15rem;
}

.notice p {
  margin: 0;
  font-size: 0.95rem;
  color: var(--text);
  line-height: 1.7;
}

.consent {
  display: flex;
  gap: 14px;
  align-items: flex-start;
  margin: 18px 0 26px;
  padding: 16px 18px;
  border-radius: 14px;
  background: rgba(13,24,36,.6);
  border: 1px solid rgba(255,255,255,.08);
  cursor: pointer;
}

.consent input[type="checkbox"] {
  flex: none;
  width: 18px;
  height: 18px;
  margin-top: 2px;
  accent-color: var(--accent);
  cursor: pointer;
}

.consent span {
  font-size: 0.85rem;
  color: var(--muted);
  line-height: 1.7;
}

.consent span a {
  color: var(--accent);
  text-decoration: underline;
}

.form-note,
.form-error,
.form-success {
  margin-top: 24px;
  font-size: 0.95rem;
  text-align: center;
  line-height: 1.7;
}

.form-note {
  color: var(--muted);
}

.form-error {
  display: none;
  color: var(--warn);
}

.form-success {
  display: none;
  color: var(--accent);
}

footer {
  padding: 34px 6vw 44px;
  text-align: center;
  border-top: 1px solid rgba(34,49,64,.85);
}

footer p {
  margin: 0 auto;
  max-width: 760px;
  color: var(--muted);
  font-size: 0.95rem;
  line-height: 1.8;
}

@media (max-width: 780px) {
  .field-row {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 640px) {
  nav {
    padding: 0 4vw;
  }

  .hero {
    min-height: auto;
    padding: calc(72px + 32px) 4vw 64px;
  }

  .hero h1 {
    font-size: clamp(32px, 10vw, 58px);
  }

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

  .section {
    padding: 64px 4vw;
  }
}

/* === Botão flutuante "próximo tópico" (canto inferior direito) ===
   Aparece depois de rolar um pouco a página; leva pro próximo <section> em
   sequência e, ao chegar no fim, vira uma seta pra cima que volta ao topo —
   ver next-section em js/script.js. Mesma ideia do botão flutuante de
   aieng.sandeco.com.br/cap06. */
#next-section {
  position: fixed;
  right: 28px;
  bottom: 28px;
  z-index: 60;
  width: 52px;
  height: 52px;
  display: grid;
  place-items: center;
  border: none;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--accent), var(--accent2));
  color: #08211d;
  cursor: pointer;
  opacity: 0;
  transform: translateY(16px);
  pointer-events: none;
  box-shadow: 0 14px 34px -14px rgba(79,209,197,.65);
  transition: opacity .3s ease, transform .3s ease, box-shadow .3s ease;
}

#next-section.visible {
  opacity: 1;
  transform: translateY(0);
  pointer-events: auto;
}

#next-section:hover {
  transform: translateY(-3px) scale(1.08);
  box-shadow: 0 18px 42px -14px rgba(79,209,197,.8);
}

#next-section svg {
  transition: transform .3s ease;
}

#next-section.is-up svg {
  transform: rotate(180deg);
}

@media (max-width: 640px) {
  #next-section {
    right: 16px;
    bottom: 16px;
    width: 46px;
    height: 46px;
  }
}

@media (prefers-reduced-motion: reduce) {
  #next-section {
    transition: opacity .3s ease;
  }

  #next-section.visible {
    transform: none;
  }

  #next-section:hover {
    transform: none;
  }
}