/* ============================================================
   GUIA DO EMAGRECIMENTO INTELIGENTE — DESIGN SYSTEM
   Referências: Apple, Stripe, Linear, Notion, Framer, Vercel
   Estrutura: Reset > Variáveis > Base > Utilitários > Componentes
              > Seções > Responsivo > Acessibilidade
   ============================================================ */


/* ============================================================
   1. RESET
   ============================================================ */

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

html {
    -webkit-text-size-adjust: 100%;
    scroll-behavior: smooth;
}

body {
    min-height: 100vh;
    overflow-x: hidden; /* evita scroll horizontal causado pelas animações de entrada */
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    text-rendering: optimizeLegibility;
}

img,
picture {
    display: block;
    max-width: 100%;
    height: auto;
}

button {
    font: inherit;
    color: inherit;
    background: none;
    border: none;
    cursor: pointer;
}

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

ul,
ol {
    list-style: none;
}

input,
textarea {
    font: inherit;
}


/* ============================================================
   2. VARIÁVEIS CSS (DESIGN TOKENS)
   ============================================================ */

:root {

    /* ---------- Cores ---------- */
    --color-white:        #FFFFFF;
    --color-dark:         #0F172A;   /* azul escuro — títulos, fundos escuros */
    --color-dark-soft:    #1E293B;   /* variação para gradientes sutis no fundo escuro */
    --color-surface:      #F8FAFC;   /* cinza claro — fundo alternado de seções */
    --color-border:       #E2E8F0;   /* bordas discretas */
    --color-text:         #334155;   /* texto padrão */
    --color-text-muted:   #64748B;   /* texto secundário */
    --color-text-on-dark: #E2E8F0;   /* texto sobre fundo escuro */

    --color-green:        #16A34A;   /* ação principal */
    --color-green-hover:  #15803D;   /* hover do botão principal */
    --color-green-soft:   #DCFCE7;   /* fundo suave para destaques em verde */

    /* ---------- Sombras ---------- */
    --shadow-xs:  0 1px 2px rgba(15, 23, 42, 0.04);
    --shadow-sm:  0 2px 8px rgba(15, 23, 42, 0.06);
    --shadow-md:  0 8px 24px rgba(15, 23, 42, 0.08);
    --shadow-lg:  0 16px 40px rgba(15, 23, 42, 0.12);
    --shadow-btn: 0 8px 20px rgba(22, 163, 74, 0.25);

    /* ---------- Raios de borda ---------- */
    --radius-sm:  10px;
    --radius-md:  16px;
    --radius-lg:  24px;
    --radius-full: 999px;

    /* ---------- Espaçamento (escala consistente, base 4px) ---------- */
    --space-1:  0.25rem;   /*  4px */
    --space-2:  0.5rem;    /*  8px */
    --space-3:  0.75rem;   /* 12px */
    --space-4:  1rem;      /* 16px */
    --space-5:  1.25rem;   /* 20px */
    --space-6:  1.5rem;    /* 24px */
    --space-8:  2rem;      /* 32px */
    --space-10: 2.5rem;    /* 40px */
    --space-12: 3rem;      /* 48px */
    --space-16: 4rem;      /* 64px */
    --space-20: 5rem;      /* 80px */
    --space-24: 6rem;      /* 96px */
    --space-32: 8rem;      /* 128px */

    /* ---------- Tipografia ---------- */
    --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;

    --text-xs:   0.8125rem;  /* 13px */
    --text-sm:   0.9375rem;  /* 15px */
    --text-base: 1.0625rem;  /* 17px — corpo levemente maior, estilo Apple/Stripe */
    --text-md:   1.1875rem;  /* 19px */
    --text-lg:   1.375rem;   /* 22px */

    /* Tipografia fluida: cresce suavemente entre mobile e desktop sem
       exigir dezenas de media queries — técnica usada por Linear/Vercel. */
    --text-h1:      clamp(2.125rem, 1.4rem + 3.2vw, 4rem);       /* 34px → 64px */
    --text-h2:      clamp(1.75rem, 1.35rem + 1.8vw, 2.75rem);    /* 28px → 44px */
    --text-h3:      clamp(1.125rem, 1rem + 0.5vw, 1.375rem);     /* 18px → 22px */
    --text-price:   clamp(1.75rem, 1.4rem + 1.5vw, 2.5rem);      /* 28px → 40px */

    --leading-tight:  1.15;
    --leading-snug:   1.35;
    --leading-normal: 1.6;

    --weight-regular:  400;
    --weight-medium:   500;
    --weight-semibold: 600;
    --weight-bold:     700;

    /* ---------- Layout ---------- */
    --container-width: 1200px;
    --container-padding: var(--space-5);

    /* ---------- Transições ---------- */
    --ease-standard: cubic-bezier(0.4, 0, 0.2, 1);
    --duration-fast:   150ms;
    --duration-base:   250ms;
    --duration-slow:   400ms;
}


/* ============================================================
   3. BASE
   ============================================================ */

body {
    font-family: var(--font-primary);
    font-size: var(--text-base);
    font-weight: var(--weight-regular);
    line-height: var(--leading-normal);
    color: var(--color-text);
    background-color: var(--color-white);
}

h1, h2, h3, h4 {
    color: var(--color-dark);
    font-weight: var(--weight-bold);
    line-height: var(--leading-tight);
    letter-spacing: -0.02em;
}

p {
    color: var(--color-text);
}

/* Link de pular navegação — acessibilidade via teclado */
.skip-link {
    position: absolute;
    top: -100%;
    left: var(--space-4);
    z-index: 999;
    padding: var(--space-3) var(--space-5);
    background: var(--color-dark);
    color: var(--color-white);
    border-radius: var(--radius-sm);
    font-weight: var(--weight-medium);
    transition: top var(--duration-base) var(--ease-standard);
}

.skip-link:focus {
    top: var(--space-4);
}


/* ============================================================
   4. UTILITÁRIOS DE LAYOUT
   ============================================================ */

.container {
    width: 100%;
    max-width: var(--container-width);
    margin-inline: auto;
    padding-inline: var(--container-padding);
}

/* Ritmo vertical consistente entre todas as seções.
   Alterar aqui reflete automaticamente na página inteira. */
.section {
    padding-block: var(--space-16);
}

.section--muted {
    background-color: var(--color-surface);
}

.eyebrow {
    display: block;
    font-size: var(--text-xs);
    font-weight: var(--weight-semibold);
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--color-green);
    margin-bottom: var(--space-3);
}

.eyebrow--center {
    text-align: center;
}

.section-title {
    font-size: var(--text-h2);
    text-align: center;
    max-width: 640px;
    margin-inline: auto;
    margin-bottom: var(--space-12);
}

.section-title--left {
    text-align: left;
    margin-inline: 0;
}


/* ============================================================
   5. ANIMAÇÃO DE ENTRADA (preparado para Intersection Observer)
   ============================================================ */

/* Estado inicial: elemento discretamente deslocado e transparente.
   O JavaScript adiciona a classe .is-visible quando o elemento
   entra na viewport, disparando a transição abaixo. */
[data-reveal] {
    opacity: 0;
    transform: translateY(24px);
    transition: opacity var(--duration-slow) var(--ease-standard),
                transform var(--duration-slow) var(--ease-standard);
}

[data-reveal].is-visible {
    opacity: 1;
    transform: translateY(0);
}


/* ============================================================
   6. BOTÕES
   ============================================================ */

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    padding: var(--space-3) var(--space-6);
    border-radius: var(--radius-full);
    font-weight: var(--weight-semibold);
    font-size: var(--text-sm);
    white-space: nowrap;
    transition: transform var(--duration-fast) var(--ease-standard),
                box-shadow var(--duration-fast) var(--ease-standard),
                background-color var(--duration-fast) var(--ease-standard);
}

.btn:active {
    transform: scale(0.98);
}

.btn--primary {
    letter-spacing: -.01em;
    background-color: var(--color-green);
    color: var(--color-white);
    box-shadow: var(--shadow-btn);
}

.btn--primary:hover {
    background-color: var(--color-green-hover);
    transform: translateY(-2px) scale(1.01);
    box-shadow: 0 12px 28px rgba(22, 163, 74, 0.32);
}

.btn--large {
    width: 100%;
    padding: var(--space-4) var(--space-8);
    font-size: var(--text-md);
    margin-block: var(--space-6);
}

.btn--header {
    padding: var(--space-2) var(--space-5);
    font-size: var(--text-xs);
    color: var(--color-dark);
    background-color: var(--color-white);
    border: 1px solid var(--color-border);
    box-shadow: var(--shadow-xs);
}

.btn--header:hover {
    background-color: var(--color-green);
    color: var(--color-white);
    border-color: var(--color-green);
    transform: translateY(-1px);
    box-shadow: var(--shadow-sm);
}


/* ============================================================
   7. CARDS
   ============================================================ */

.card {
    background-color: var(--color-white);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: var(--space-6);
    box-shadow: var(--shadow-xs);
    transition: transform var(--duration-base) var(--ease-standard),
                box-shadow var(--duration-base) var(--ease-standard),
                border-color var(--duration-base) var(--ease-standard);
}

.card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
    border-color: transparent;
}

.card img {
    margin-bottom: var(--space-4);
}

.card__title {
    font-size: var(--text-md);
    margin-bottom: var(--space-2);
}

.card__text {
    font-size: var(--text-sm);
    color: var(--color-text-muted);
    line-height: var(--leading-snug);
}

.card__label {
    display: block;
    font-size: var(--text-sm);
    font-weight: var(--weight-medium);
    color: var(--color-dark);
}

/* Variação compacta — usada na grade de tópicos do guia (9 itens) */
.card--compact {
    padding: var(--space-4) var(--space-5);
    display: flex;
    align-items: center;
    gap: var(--space-3);
}

.card--compact .lucide-icon {
    width: 28px;
    height: 28px;
    margin-bottom: 0;
    flex-shrink: 0;
    color: var(--color-green);
}


/* ============================================================
   8. HEADER
   ============================================================ */

.header {
    position: sticky;
    top: 0;
    z-index: 100;

    /* Estado inicial: transparente, sem blur e sem sombra —
       o header se funde visualmente ao topo do Hero. */
    background-color: transparent;
    border-bottom: 1px solid transparent;
    box-shadow: none;

    transition: background-color var(--duration-slow) var(--ease-standard),
                border-color var(--duration-slow) var(--ease-standard),
                box-shadow var(--duration-slow) var(--ease-standard),
                backdrop-filter var(--duration-slow) var(--ease-standard);
}

/* Aplicada via JavaScript assim que o usuário começa a rolar a página. */
.header--scrolled {
    background-color: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-bottom-color: var(--color-border);
    box-shadow: var(--shadow-sm);
}

.header__container {
    display: flex;
    height: 76px;
    align-items: center;
    justify-content: space-between;
    padding-block: var(--space-4);
}

.header__logo {
    font-size: var(--text-md);
    font-weight: var(--weight-bold);
    color: var(--color-dark);
    letter-spacing: -0.01em;
}


/* ============================================================
   9. HERO
   ============================================================ */

.hero {
    padding-block: var(--space-16) var(--space-12);
    background: linear-gradient(180deg, var(--color-surface) 0%, var(--color-white) 100%);
}

.hero__container {
    display: flex;
    flex-direction: column;
    gap: var(--space-10);
}

.hero__title {
    font-size: var(--text-h1);
    margin-bottom: var(--space-5);
}

.hero__title span {
    color: var(--color-green);
}

.hero__subtitle {
    font-size: var(--text-md);
    color: var(--color-text-muted);
    line-height: var(--leading-normal);
    max-width: 42ch;
}

.hero__badges {
    display: flex;
    flex-direction: column;
    gap: var(--space-3);
}

.hero__badge {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    font-size: var(--text-sm);
    color: var(--color-text-muted);
    font-weight: var(--weight-medium);
    padding: 6px 12px;
    border-radius: 999px;
    background: rgba(22,163,74,.06);
}

.hero__media img {
    width: 100%;
    max-width: 520px;
    height: auto;
    display: block;
    margin-inline: auto;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
}


/* ============================================================
   10. CREDIBILIDADE
   ============================================================ */

.credibility__container {
    display: flex;
    flex-direction: column;
    gap: var(--space-10);
}

.credibility__text {
    color: var(--color-text-muted);
    max-width: 60ch;
}

.credibility__points {
    display: flex;
    flex-direction: column;
    gap: var(--space-5);
}

.credibility__point {
    display: flex;
    align-items: flex-start;
    gap: var(--space-3);
    font-size: var(--text-sm);
    font-weight: var(--weight-medium);
    color: var(--color-dark);
}

.credibility__point .lucide-icon {
    width: 24px;
    height: 24px;
    flex-shrink: 0;
    margin-top: 2px;
    color: var(--color-green);
}


/* ============================================================
   11. PROBLEMA
   ============================================================ */

.problem__grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-5);
    margin-bottom: var(--space-10);
}

.problem__conclusion {
    text-align: center;
    font-size: var(--text-md);
    font-weight: var(--weight-semibold);
    color: var(--color-dark);
}


/* ============================================================
   12. TÓPICOS DO GUIA (antigas seções Solução + Conteúdo)
   ============================================================ */

.topics__container {
    display: flex;
    flex-direction: column;
    gap: var(--space-12);
}

.topics__media img {
    width: 100%;
    max-width: 560px;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    margin-inline: auto;
}

.topics__lead {
    color: var(--color-text-muted);
    margin-bottom: var(--space-8);
    max-width: 48ch;
}

.topics__grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-2);
}


/* ============================================================
   13. PARA QUEM
   ============================================================ */

.audience__grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-5);
}


/* ============================================================
   14. BENEFÍCIOS
   ============================================================ */

.benefits__grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-5);
}


/* ============================================================
   15. GARANTIA
   ============================================================ */

.guarantee {
    background: linear-gradient(160deg, var(--color-dark) 0%, var(--color-dark-soft) 100%);
}

.guarantee__card {
    text-align: center;
    max-width: 560px;
    margin-inline: auto;
}

.guarantee__card img {
    margin-inline: auto;
    margin-bottom: var(--space-5);
}

.guarantee__title {
    color: var(--color-white);
    font-size: var(--text-h2);
    margin-bottom: var(--space-4);
}

.guarantee__text {
    color: var(--color-text-on-dark);
    font-size: var(--text-base);
}


/* ============================================================
   16. FAQ
   ============================================================ */

.faq__list {
    max-width: 720px;
    margin-inline: auto;
    display: flex;
    flex-direction: column;
    gap: var(--space-3);
}

.faq__item {
    background-color: var(--color-white);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    overflow: hidden;
    transition: box-shadow var(--duration-base) var(--ease-standard);
}

.faq__item:hover {
    box-shadow: var(--shadow-sm);
}

.faq__question {
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-4);
    padding: var(--space-5) var(--space-6);
    text-align: left;
    font-size: var(--text-base);
    font-weight: var(--weight-semibold);
    color: var(--color-dark);
    transition: color var(--duration-fast) var(--ease-standard);
}

.faq__question:hover {
    color: var(--color-green-hover);
}

/* Ícone "+" construído em CSS puro — evita mais um asset SVG */
.faq__icon {
    position: relative;
    flex-shrink: 0;
    width: 20px;
    height: 20px;
}

.faq__icon::before,
.faq__icon::after {
    content: '';
    position: absolute;
    background-color: var(--color-dark);
    border-radius: var(--radius-full);
    transition: transform var(--duration-base) var(--ease-standard);
}

.faq__icon::before {
    top: 50%;
    left: 0;
    width: 100%;
    height: 2px;
    transform: translateY(-50%);
}

.faq__icon::after {
    top: 0;
    left: 50%;
    width: 2px;
    height: 100%;
    transform: translateX(-50%);
}

.faq__question[aria-expanded="true"] .faq__icon::after {
    transform: translateX(-50%) rotate(90deg);
    opacity: 0;
}

/* Painel de resposta — a altura final é calculada via JavaScript
   (scrollHeight) para permitir uma transição suave de abertura. */
.faq__answer {
    max-height: 0;
    overflow: hidden;
    padding-inline: var(--space-6);
    transition: max-height var(--duration-slow) var(--ease-standard),
                padding var(--duration-slow) var(--ease-standard);
}

.faq__answer:not([hidden]) {
    padding-block: 0 var(--space-5);
}

.faq__answer p {
    color: var(--color-text-muted);
    font-size: var(--text-sm);
}


/* ============================================================
   17. CTA FINAL
   ============================================================ */

.final-cta {
    padding-block: var(--space-24);
    background: linear-gradient(160deg, var(--color-dark) 0%, var(--color-dark-soft) 100%);
    text-align: center;
}
.final-cta__subtitle{
    max-width:600px;
    margin:0 auto 2rem;
    color:var(--color-text-on-dark);
    opacity:.9;
}

.final-cta__container {
    max-width: 640px;
}

.final-cta__title {
    color: var(--color-white);
    font-size: var(--text-h2);
    margin-bottom: var(--space-6);
}

.final-cta__price {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-1);
    margin-bottom: var(--space-2);
}

.final-cta__price-old {
    color: var(--color-text-on-dark);
    font-size: var(--text-sm);
    text-decoration: line-through;
    opacity: 0.7;
}
.final-cta__benefits{
    display:grid;
    gap:.75rem;
    margin:2rem auto;
    max-width:420px;
    text-align:left;
    color:var(--color-white);
}
.final-cta__benefits li{
    font-size:1rem;
}
.final-cta__secure{
    margin-top:1rem;
    font-size:.9rem;
    color:var(--color-text-on-dark);
    opacity:.8;
}

.final-cta__price-new {
    color: var(--color-white);
    font-size: var(--text-price);
    font-weight: var(--weight-bold);
}

.final-cta .btn--large {
    max-width: 420px;
    margin-inline: auto;
}


/* ============================================================
   18. FOOTER
   ============================================================ */

.footer {
    padding-block: var(--space-12);
    border-top: 1px solid var(--color-border);
}

.footer__container {
    display: flex;
    flex-direction: column;
    gap: var(--space-6);
    text-align: center;
}

.footer__disclaimer {
    font-size: var(--text-xs);
    color: var(--color-text-muted);
    max-width: 60ch;
    margin-inline: auto;
    line-height: var(--leading-normal);
}

.footer__links {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: var(--space-6);
}

.footer__links a {
    font-size: var(--text-xs);
    font-weight: var(--weight-medium);
    color: var(--color-text-muted);
    transition: color var(--duration-fast) var(--ease-standard);
}

.footer__links a:hover {
    color: var(--color-dark);
}

.footer__copyright {
    font-size: var(--text-xs);
    color: var(--color-text-muted);
    opacity: 0.8;
}


/* ============================================================
   19. BOTÃO VOLTAR AO TOPO
   ============================================================ */

.back-to-top {
    position: fixed;
    right: var(--space-5);
    bottom: var(--space-5);
    z-index: 90;
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: var(--color-dark);
    border-radius: var(--radius-full);
    box-shadow: var(--shadow-md);
    opacity: 0;
    visibility: hidden;
    transform: translateY(8px);
    transition: opacity var(--duration-base) var(--ease-standard),
                transform var(--duration-base) var(--ease-standard),
                background-color var(--duration-fast) var(--ease-standard);
}

.back-to-top.is-visible {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.back-to-top:hover {
    background-color: var(--color-dark-soft);
    transform: translateY(-2px);
}

/* JS remove o atributo "hidden" apenas para leitores de tela quando
   necessário; a visibilidade real é controlada pela classe acima. */
.back-to-top[hidden] {
    display: flex;
}


/* ============================================================
   20. RESPONSIVO — TABLET (≥ 768px)
   ============================================================ */

@media (min-width: 768px) {

    :root {
        --container-padding: var(--space-8);
    }

    .problem__grid,
    .audience__grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .benefits__grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .topics__grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .credibility__points {
        flex-direction: row;
        gap: var(--space-8);
    }

    .credibility__point {
        flex: 1;
    }

    .final-cta .btn--large,
    .btn--large {
        width: auto;
    }
}


/* ============================================================
   21. RESPONSIVO — DESKTOP (≥ 1024px)
   ============================================================ */

@media (min-width: 1024px) {

    .section {
        padding-block: var(--space-24);
    }

    /* ---------- Hero ---------- */
    .hero__container {
    flex-direction: row;
    align-items: center;
    gap: var(--space-20);
}

    .hero__content {
        flex: 1;
    }

    .hero__media {
    flex: 1;
    display: flex;
    justify-content: center;
    align-items: center;
}

    .hero__badges {
        flex-direction: row;
        flex-wrap: wrap;
        gap: var(--space-6);
    }

    /* ---------- Credibilidade ---------- */
    .credibility__container {
        flex-direction: row;
        align-items: flex-start;
        gap: var(--space-16);
    }

    .credibility__intro {
        flex: 1;
    }

    .credibility__points {
        flex: 1;
        flex-direction: column;
    }

    /* ---------- Problema ---------- */
    .problem__grid {
        grid-template-columns: repeat(4, 1fr);
    }

    /* ---------- Tópicos do guia ---------- */
    .topics__container {
        flex-direction: row;
        align-items: center;
        gap: var(--space-16);
    }

    .topics__media {
        flex: 0 0 44%;
    }

    .topics__content {
        flex: 1;
    }

    .topics__grid {
        grid-template-columns: repeat(3, 1fr);
    }

    /* ---------- Para quem ---------- */
    .audience__grid {
        grid-template-columns: repeat(3, 1fr);
    }

    /* ---------- Benefícios ---------- */
    .benefits__grid {
        grid-template-columns: repeat(4, 1fr);
    }
}

@media (min-width: 1280px) {
    :root {
        --container-padding: var(--space-10);
    }
}


/* ============================================================
   22. ACESSIBILIDADE
   ============================================================ */

/* Foco visível e consistente em todos os elementos interativos */
a:focus-visible,
button:focus-visible {
    outline: 2px solid var(--color-green);
    outline-offset: 3px;
    border-radius: var(--radius-sm);
}

/* Respeita a preferência do usuário por menos movimento */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }

    [data-reveal] {
        opacity: 1;
        transform: none;
    }
}