html, body { max-width: 100%; overflow-x: hidden; }
.whatsapp-button { position: fixed; right: 1.25rem; bottom: 1.25rem; z-index: 10; display: grid; width: 57px; height: 57px; place-items: center; border-radius: 50%; background: #25d366; box-shadow: 0 8px 24px rgba(0,0,0,.25); transition: transform .2s; }
.whatsapp-button:hover { transform: translateY(-3px); }
.whatsapp-button:focus-visible { outline: 3px solid #fff; outline-offset: 3px; }
.whatsapp-button img { width: 57px; height: 57px; border-radius: 50%; }

@media (max-width: 640px) {
  html, body { width: 100%; overflow-x: clip; }
  body { -webkit-text-size-adjust: 100%; }

  .site-header {
    gap: 7px;
    padding: 10px 22px 9px;
  }
  .brand { gap: 10px; }
  .brand-mark { width: 39px; height: 39px; }
  .nav { gap: 0; justify-content: space-between; }
  .nav a {
    min-height: 38px;
    display: grid;
    place-items: center;
    padding: 7px 4px;
    font-size: .84rem;
    white-space: nowrap;
  }

  .hero, .campaign-hero { min-height: 100svh; overflow: hidden; }
  .hero {
    background-image: linear-gradient(0deg, rgba(25,7,30,.94) 0%, rgba(25,7,30,.58) 58%, rgba(25,7,30,.2) 100%), url("/assets/hero-imersoes-internacionais.png");
    background-position: 92% center;
  }
  .campaign-hero {
    background-image: linear-gradient(0deg, rgba(25,7,30,.95) 0%, rgba(25,7,30,.64) 56%, rgba(25,7,30,.16) 100%), url("/assets/hero-imersoes-internacionais.png");
    background-position: 100% center;
  }
  .hero:after { right: -25vw; bottom: -30vw; width: 82vw; height: 82vw; }
  .hero-inner { padding-top: 154px; padding-bottom: 42px; }
  .hero-copy { margin-bottom: 28px; font-size: 1.05rem; line-height: 1.58; }
  .hero-actions { gap: 12px; }
  .hero-actions .button { min-height: 55px; }

  .immersions, .proof { padding-top: 76px; padding-bottom: 76px; }
  .section-heading, .proof-head { margin-bottom: 36px; }
  .section-heading > p:last-child, .experience-copy > p:last-child, .signature-copy p, .proof-head > p:last-child, .quote p { font-size: 1rem; line-height: 1.62; }

  .service-grid { gap: 16px; }
  .service-grid article, .experience-card { min-height: 340px; padding: 28px; }
  .service-grid article p { margin-bottom: 14px; }
  .service-grid a, .experience-card a {
    display: inline-flex;
    min-height: 46px;
    align-items: center;
    padding: 10px 0;
  }
  .experience { gap: 42px; padding-top: 76px; padding-bottom: 76px; }
  .experience-list div { grid-template-columns: 44px 1fr; gap: 6px 14px; padding: 24px 0; }

  .proof-scroll { grid-auto-columns: minmax(282px, 84vw); gap: 14px; padding-bottom: 18px; }
  .proof figure > div { height: 300px; }
  .signature { gap: 38px; padding-top: 76px; padding-bottom: 76px; }
  .quote { min-height: 440px; padding-top: 62px; padding-bottom: 62px; }
  .footer { padding-top: 30px; padding-bottom: 86px; }
  .footer-links { flex-wrap: wrap; gap: 12px 18px; }

  .campaign-hero { min-height: 100svh; padding-top: 170px; padding-bottom: 38px; }
  .campaign-hero h1, .experiences-hero h1 { margin: 16px 0; }
  .campaign-hero p:last-of-type, .experiences-hero > p:last-child { line-height: 1.58; }
  .availability-tag { max-width: 100%; line-height: 1.35; }
  .campaign-story, .campaign-price, .campaign-next, .campaign-faq, .experience-archive { gap: 38px; padding-top: 70px; padding-bottom: 70px; }
  .story-list article { padding: 18px 0; }
  .price-cards { gap: 14px; }
  .price-cards article { padding: 24px; }
  .waitlist-form { gap: 18px; padding: 24px; }
  .waitlist-form input, .waitlist-form select { min-height: 46px; font-size: 16px; }
  .waitlist-form textarea { min-height: 88px; font-size: 16px; }
  .waitlist-form .button { min-height: 54px; }

  .experiences-hero {
    min-height: 660px;
    padding-top: 164px;
    padding-bottom: 48px;
    background-image: linear-gradient(0deg, rgba(25,7,30,.94) 0%, rgba(25,7,30,.6) 57%, rgba(25,7,30,.16) 100%), url("/assets/hero-imersoes-internacionais.png");
    background-position: 100% center;
  }
  .experiences-grid { padding-top: 72px; padding-bottom: 72px; }
  .experience-cards { gap: 16px; }
  .experience-card { min-height: 390px; }
  .experience-card h3 { font-size: clamp(2.35rem, 12vw, 3.1rem); }
  .archive-grid { gap: 12px; }
  .archive-grid article { min-height: 0; padding: 24px; }

  .whatsapp-button, .whatsapp-button img { width: 52px; height: 52px; }
  .whatsapp-button { right: 1rem; bottom: 1rem; }
}

@media (max-width: 360px) {
  .nav a { font-size: .76rem; }
  .hero-inner { padding-top: 148px; }
  .campaign-hero { padding-top: 158px; }
}

.menu-toggle, .menu-backdrop { display: none; }

@media (max-width: 640px) {
  body.nav-open { overflow: hidden; }
  .site-header {
    min-height: 64px;
    align-items: center;
    flex-direction: row;
    padding: 10px 22px;
  }
  .site-header .nav {
    position: fixed;
    top: 0;
    left: 0;
    bottom: 0;
    z-index: 50;
    width: min(84vw, 330px);
    display: flex;
    flex-direction: column;
    align-items: stretch;
    justify-content: flex-start;
    gap: 8px;
    padding: 96px 24px 34px;
    color: var(--deep);
    background: #fff;
    box-shadow: 14px 0 34px rgba(43,14,49,.14);
    transform: translateX(-105%);
    transition: transform .24s ease;
  }
  .site-header.menu-open .nav { transform: translateX(0); }
  .site-header.menu-open { z-index: 60; background: transparent; border-color: transparent; backdrop-filter: none; }
  .site-header .nav a {
    width: 100%;
    min-height: 54px;
    flex: 0 0 auto;
    justify-content: flex-start;
    padding: 15px 16px;
    border-bottom: 1px solid var(--line);
    border-radius: 0;
    color: var(--deep);
    font-size: 1rem;
  }
  .site-header .nav a:hover { color: var(--plum); background: rgba(255,189,24,.14); }
  .menu-toggle {
    position: relative;
    z-index: 60;
    display: grid;
    width: 44px;
    height: 44px;
    gap: 5px;
    place-content: center;
    margin-left: auto;
    padding: 0;
    border: 1px solid rgba(255,255,255,.25);
    border-radius: 50%;
    color: #fff;
    background: rgba(255,255,255,.07);
  }
  .menu-toggle span { display: block; width: 18px; height: 2px; border-radius: 2px; background: currentColor; transition: transform .2s, opacity .2s; }
  .site-header.menu-open .menu-toggle span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
  .site-header.menu-open .menu-toggle span:nth-child(2) { opacity: 0; }
  .site-header.menu-open .menu-toggle span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }
  .site-header.menu-open .menu-toggle { position: fixed; top: 12px; left: calc(min(84vw, 330px) - 56px); margin: 0; color: var(--deep); border-color: var(--line); background: #fff; }
  .menu-backdrop {
    position: fixed;
    inset: 0;
    z-index: 40;
    border: 0;
    background: transparent;
    opacity: 1;
    pointer-events: none;
    transition: opacity .24s ease;
  }
  body.nav-open .menu-backdrop { display: block; pointer-events: auto; }
}