.chapter { max-width: 680px; width: 100%; margin: 0 auto; display: flex; flex-direction: column; gap: 16px; padding: 16px 0 40px; }

.chapter__back { font-size: 14px; }

.chapter__head { display: flex; flex-direction: column; gap: 8px; }

.chapter__head h1 { font-size: clamp(26px, 3vw, 32px); line-height: 1.2; }

.chapter__intro { font-size: 16px; }

.steps { display: flex; flex-direction: column; gap: 14px; list-style: none; }

.step { display: flex; flex-direction: column; gap: 14px; }

.step__line { display: flex; gap: 12px; align-items: flex-start; }

.step__num {
    flex-shrink: 0;
    width: 26px;
    height: 26px;
    border-radius: 999px;
    background: #f0fdfa;
    color: var(--teal);
    font-size: 13px;
    font-weight: 800;
    display: flex;
    align-items: center;
    justify-content: center;
}

.step__body { flex: 1; display: flex; flex-direction: column; gap: 4px; padding-top: 2px; }

.step__text { font-size: 15px; line-height: 1.6; color: var(--body); }

.step__desc { font-size: 13.5px; line-height: 1.55; color: var(--muted); }

/* Botão de instalação do passo — o `.store` da confirmação do
   cadastro, na largura do conteúdo. */
.step__cta {
    display: inline-flex;
    align-items: center;
    align-self: flex-start;
    gap: 12px;
    margin-top: 8px;
    border: none;
    border-radius: 14px;
    padding: 12px 20px;
    background: var(--on-yellow);
    color: #ffffff;
    font-family: inherit;
    text-align: left;
    cursor: pointer;
}

a.step__cta:hover { color: #ffffff; text-decoration: none; }

.step__cta-lines { display: flex; flex-direction: column; align-items: flex-start; line-height: 1.2; }

.step__cta-pre { font-size: 11px; font-weight: 700; opacity: .7; }

.step__cta-name { font-size: 15px; font-weight: 800; }

.step__cta--soon { background: var(--line); color: var(--muted); cursor: default; }

.tabs { display: flex; flex-direction: column; gap: 14px; }

/* Escondido por geometria, nunca `display: none`: o radio segue
   focável e as setas do teclado trocam de aba. */
.tabs__radio { position: absolute; width: 1px; height: 1px; opacity: 0; }

.tabs__bar { display: flex; gap: 10px; }

.tabs__tab {
    flex: 1;
    text-align: center;
    cursor: pointer;
    background: var(--surface);
    border: 1.5px solid var(--line);
    border-radius: 999px;
    padding: 11px 0;
    font-size: 15px;
    font-weight: 700;
    color: var(--body);
}

#tab-iphone:checked ~ .tabs__bar .tabs__tab[for="tab-iphone"],
#tab-android:checked ~ .tabs__bar .tabs__tab[for="tab-android"] {
    border-color: var(--teal);
    background: #f0fdfa;
    color: var(--ink);
    font-weight: 800;
}

#tab-iphone:focus-visible ~ .tabs__bar .tabs__tab[for="tab-iphone"],
#tab-android:focus-visible ~ .tabs__bar .tabs__tab[for="tab-android"] {
    outline: 2px solid var(--teal);
    outline-offset: 2px;
}

.tabs .tabs__panel { display: none; }

#tab-iphone:checked ~ .tabs__panel--iphone,
#tab-android:checked ~ .tabs__panel--android { display: block; }

.shot { margin-left: 38px; width: min(200px, 100%); }

.shot__img { display: block; width: 100%; height: auto; border-radius: 16px; border: 1px solid var(--line); }

.shot__pending {
    aspect-ratio: 9 / 17;
    border-radius: 16px;
    border: 1px dashed var(--line);
    background: var(--surface);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 12px;
    text-align: center;
    font-size: 12.5px;
    line-height: 1.5;
    color: var(--muted);
}

.chapter__nav { display: flex; gap: 10px; margin-top: 6px; flex-wrap: wrap; }

.nav-link {
    flex: 1;
    border-radius: 999px;
    padding: 12px 14px;
    font-size: 13px;
    font-weight: 700;
    color: var(--ink);
    background: var(--surface);
    border: 1.5px solid var(--line);
}

.nav-link:hover { color: var(--ink); text-decoration: none; border-color: var(--teal); }

.nav-link--next {
    background: var(--yellow);
    border-color: var(--yellow);
    color: var(--on-yellow);
    font-size: 14px;
    font-weight: 800;
    padding: 14px 18px;
    text-align: center;
    box-shadow: 0 10px 28px rgba(255, 211, 0, .35);
}

.nav-link--next:hover { color: var(--on-yellow); border-color: var(--yellow); }