/* =========================================
   CHEAT SHEET — Style Infographic
   Theme: Productivity Cheat Sheet (Green Edition)
   ========================================= */

/* --- Reset & Base --- */
*,
*::before,
*::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* Brand Colors - OKLCH */
    --green: oklch(52% 0.14 152);        /* verde vivo — pílulas, bordas, ícones */
    --green-dark: oklch(40% 0.12 152);   /* texto verde sobre fundo claro */
    --green-light: oklch(95% 0.03 152);  /* tinta verde sutil */
    --black: oklch(22% 0.01 152);
    --gray-dark: oklch(46% 0.01 152);
    --gray-light: oklch(86% 0.01 152);
    --paper-bg: oklch(99% 0.002 152);
    --body-bg: oklch(95% 0.005 152);
    --surface-hover: oklch(96% 0.012 152);
    --on-green: oklch(99% 0.002 152);    /* texto sobre pílula verde */
    --footer-bg: oklch(22% 0.01 152);
    --footer-text: oklch(97% 0.005 152);
    --dislike: oklch(58% 0.17 25);       /* vermelho — desjoinha */
    --dislike-dark: oklch(48% 0.16 25);  /* texto vermelho sobre fundo claro */
    --on-dislike: oklch(99% 0.004 25);   /* texto sobre pílula vermelha */

    /* Layout */
    --border-solid: 1px solid var(--gray-light);
    --radius: 6px;

    /* Typography */
    --font-display: 'Hanken Grotesk', system-ui, sans-serif;
    --font-body: 'Hanken Grotesk', system-ui, sans-serif;
    --font-serif: 'Literata', Georgia, serif;

    /* Animation Easing */
    --ease-out-quart: cubic-bezier(0.25, 1, 0.5, 1);
    --ease-out-quint: cubic-bezier(0.22, 1, 0.36, 1);
}

@media (prefers-color-scheme: dark) {
    :root {
        --green: oklch(67% 0.13 152);
        --green-dark: oklch(76% 0.11 152);
        --green-light: oklch(28% 0.04 152);
        --black: oklch(95% 0.01 152);
        --gray-dark: oklch(72% 0.01 152);
        --gray-light: oklch(38% 0.01 152);
        --paper-bg: oklch(21% 0.005 152);
        --body-bg: oklch(16% 0.01 152);
        --surface-hover: oklch(26% 0.01 152);
        --on-green: oklch(16% 0.01 152);
        --footer-bg: oklch(26% 0.01 152);
        --footer-text: oklch(95% 0.005 152);
        --dislike: oklch(70% 0.16 25);
        --dislike-dark: oklch(78% 0.14 25);
        --on-dislike: oklch(18% 0.02 25);
    }
}

html {
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    background: var(--body-bg);
}

/* Navegação entre páginas com fundido suave (progressive enhancement) */
@view-transition {
    navigation: auto;
}
@media (prefers-reduced-motion: reduce) {
    ::view-transition-old(root),
    ::view-transition-new(root) {
        animation: none !important;
    }
}

::selection {
    background: var(--green);
    color: var(--on-green);
}

body {
    font-family: var(--font-body);
    color: var(--black);
    line-height: 1.55;
    display: flex;
    justify-content: center;
    background: var(--body-bg);
    font-kerning: normal;
    font-optical-sizing: auto;
}

/* --- Accessibility Focus --- */
*:focus-visible {
    outline: 2px solid var(--green);
    outline-offset: 2px;
}

.skip-link {
    position: absolute;
    top: -100px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--green);
    color: var(--on-green);
    padding: 10px 20px;
    z-index: 9999;
    text-decoration: none;
    font-weight: 700;
    border-radius: 0;
    transition: top 200ms var(--ease-out-quart);
}

.skip-link:focus, .skip-link:focus-visible {
    top: 0;
    outline: 2px solid var(--black);
    outline-offset: 2px;
}

/* --- Page Container --- */
.page {
    background: var(--paper-bg);
    width: 100%;
    max-width: 950px;
    padding: max(3.5rem, env(safe-area-inset-top)) max(3.5rem, env(safe-area-inset-right)) max(3.5rem, env(safe-area-inset-bottom)) max(3.5rem, env(safe-area-inset-left));
    animation: fade-in 800ms var(--ease-out-quart) forwards;
}

/* --- Back Link --- */
.back-link {
    display: inline-flex;
    align-items: center;
    color: var(--gray-dark);
    text-decoration: none;
    font-size: 0.95rem;
    font-weight: 600;
    margin-bottom: 2rem;
    padding-bottom: 2px;
    border-bottom: var(--border-solid);
    transition: color 200ms var(--ease-out-quart), border-color 200ms var(--ease-out-quart);
}
.icon-arrow {
    display: inline-block;
    transition: transform 200ms var(--ease-out-quart);
    margin-right: 4px;
}

/* --- Header --- */
.header {
    text-align: center;
    padding: 0 0 3rem 0;
    margin-bottom: 3rem;
    border-bottom: 3px solid var(--green);
}

.header-title {
    font-family: var(--font-display);
    font-size: clamp(2rem, 4vw + 1rem, 3.2rem);
    line-height: 1.1;
    letter-spacing: -0.02em;
    margin-bottom: 0.5rem;
    text-wrap: balance;
    font-weight: 800;
}

/* Primeira palavra verde, restante preto — como na referência */
.header-title-light {
    font-weight: 800;
    color: var(--green);
}

.header-title-bold {
    font-weight: 800;
    color: var(--black);
}

.header-subtitle {
    color: var(--gray-dark);
    font-size: 1.05rem;
    font-weight: 600;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    margin-bottom: 1rem;
}

.header-credit {
    color: var(--gray-dark);
    font-size: 0.95rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 1.5rem;
}

.header-intro {
    font-size: 1.05rem;
    max-width: 58ch;
    margin: 0 auto;
    color: var(--gray-dark);
    text-wrap: balance;
}

/* --- Library Controls --- */
.library-controls {
    display: flex;
    gap: 1rem;
    margin-bottom: 2rem;
}
.search-input {
    flex: 1;
    padding: 0.75rem 1rem;
    font-family: var(--font-body);
    font-size: 1rem;
    border: var(--border-solid);
    border-radius: var(--radius);
    background: var(--paper-bg);
    color: var(--black);
}

/* --- Grid Layout --- */
/* Páginas de capítulo/visão geral: colunas balanceadas (sem buracos),
   mesma regra de densidade do PDF. A estante (#bookshelf) usa grid próprio. */
.grid {
    columns: 2;
    column-gap: 2rem;
    margin-bottom: 3rem;
}
.grid > * {
    break-inside: avoid;
    margin-bottom: 2rem;
}
.grid > .card-wide {
    column-span: all;
}
/* Lições fluem dentro das colunas (reparentadas pelo script.js), como no PDF */
.grid > .lessons {
    margin-bottom: 2rem;
}

/* Estante: vitrine de capas inteiras em 3 colunas */
#bookshelf { margin-bottom: 3rem; }
.shelf-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
}

.grid-message {
    color: var(--gray-dark);
    text-align: center;
    grid-column: 1 / -1;
    column-span: all;
}

/* === Estante curada: controles, chips, trilhas e seções (jun/2026) ===
   Coleções temáticas geradas das tags pelo script.js; tudo nos tokens verdes. */
.library-controls { flex-wrap: wrap; }
.status-toggle {
    display: inline-flex;
    border: var(--border-solid);
    border-radius: 999px;
    overflow: hidden;
    flex-shrink: 0;
}
.status-toggle button {
    appearance: none;
    background: transparent;
    border: none;
    cursor: pointer;
    font-family: var(--font-body);
    font-size: 0.8rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.03em;
    color: var(--gray-dark);
    padding: 0 1rem;
    min-height: 44px;
    transition: background 160ms var(--ease-out-quart), color 160ms var(--ease-out-quart);
}
.status-toggle button + button { border-left: var(--border-solid); }
.status-toggle button:hover { background: var(--surface-hover); }
.status-toggle button[aria-pressed="true"] { background: var(--green); color: var(--on-green); }

/* Voto por livro: joinha verde (curtir) / desjoinha vermelho (não curtir) */
.card-vote { display: flex; gap: 0.5rem; margin-top: 0.6rem; }
.vote-btn {
    flex: 1;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.4rem;
    cursor: pointer;
    background: transparent;
    border-radius: 999px;
    font-family: var(--font-body);
    font-weight: 800;
    font-size: 0.9rem;
    padding: 0.35rem 0.5rem;
    min-height: 40px;
    transition: background 160ms var(--ease-out-quart), color 160ms var(--ease-out-quart);
}
.vote-btn svg { width: 17px; height: 17px; flex-shrink: 0; }
.vote-up { color: var(--green-dark); border: 2px solid var(--green); }
.vote-up:hover { background: var(--surface-hover); }
.vote-up[aria-pressed="true"] { background: var(--green); color: var(--on-green); }
.vote-down { color: var(--dislike-dark); border: 2px solid var(--dislike); }
.vote-down:hover { background: var(--surface-hover); }
.vote-down[aria-pressed="true"] { background: var(--dislike); color: var(--on-dislike); }
.vote-down svg { transform: scaleY(-1); }

.trilhas { margin-bottom: 2.5rem; }
.trilhas-head { margin-bottom: 1rem; }
.trilhas-head h2 {
    font-family: var(--font-display);
    font-size: 1rem;
    font-weight: 800;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    color: var(--black);
}
.trilhas-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
    gap: 1rem;
}
.trilha-card {
    text-align: left;
    cursor: pointer;
    background: transparent;
    border: 2px dashed var(--green);
    border-radius: var(--radius);
    padding: 1rem;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    transition: background 160ms var(--ease-out-quart), border-color 160ms var(--ease-out-quart);
}
.trilha-card:hover { background: var(--surface-hover); }
.trilha-card[aria-pressed="true"] { border-color: var(--green-dark); background: var(--surface-hover); }
.trilha-name {
    align-self: flex-start;
    background: var(--green);
    color: var(--on-green);
    font-family: var(--font-display);
    font-weight: 800;
    font-size: 0.82rem;
    text-transform: uppercase;
    letter-spacing: 0.03em;
    padding: 0.25rem 0.7rem;
    border-radius: 999px;
}
.trilha-titles { color: var(--gray-dark); font-size: 0.85rem; line-height: 1.45; }
.trilha-count {
    color: var(--green-dark);
    font-size: 0.76rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.04em;
}

.shelf-section { margin-bottom: 3rem; }
.section-title {
    font-family: var(--font-display);
    font-size: 1.15rem;
    font-weight: 800;
    text-transform: uppercase;
    letter-spacing: 0.03em;
    color: var(--black);
    margin-bottom: 1.25rem;
    padding-bottom: 0.5rem;
    border-bottom: 2px solid var(--green);
    display: flex;
    align-items: baseline;
    justify-content: space-between;
    gap: 0.75rem;
}
.section-title .section-count {
    color: var(--gray-dark);
    font-family: var(--font-body);
    font-size: 0.78rem;
    font-weight: 600;
    text-transform: none;
    letter-spacing: 0;
    white-space: nowrap;
}

/* Mobile: o toggle de status ocupa a largura toda e divide entre os 3 botões */
@media (max-width: 640px) {
    .status-toggle { width: 100%; }
    .status-toggle button { flex: 1; padding: 0 0.5rem; font-size: 0.72rem; letter-spacing: 0.02em; line-height: 1.2; }
}

/* --- Extracted Components --- */
.chapter-list {
    display: flex;
    flex-direction: column;
}

.chapter-link {
    text-decoration: none;
    padding: 0.5rem 1rem;
    min-height: 44px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    border: var(--border-solid);
    border-radius: var(--radius);
    color: var(--green-dark);
    font-weight: 700;
    background: var(--paper-bg);
    margin-bottom: 0.5rem;
    transition: background-color 200ms var(--ease-out-quart);
}
.chapter-link .arrow {
    transition: transform 200ms var(--ease-out-quart);
}

.content-list {
    list-style-type: square;
    margin-left: 1.25rem;
    color: var(--gray-dark);
    font-size: 0.95rem;
    margin-top: 0.5rem;
    margin-bottom: 1rem;
}
.content-list li {
    margin-bottom: 0.5rem;
}
.content-list li::marker {
    color: var(--green);
}
.content-list strong {
    color: var(--black);
}

.table-scroll {
    overflow-x: auto;
}

.data-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.95rem;
    text-align: left;
}
.data-table th {
    padding: 0.75rem;
    color: var(--green-dark);
    text-transform: uppercase;
    font-family: var(--font-display);
    font-size: 0.85rem;
    letter-spacing: 0.03em;
    border-bottom: 2px solid var(--green);
}
.data-table td {
    padding: 0.75rem;
    color: var(--gray-dark);
    border-bottom: var(--border-solid);
}

/* --- Chapter Navigation --- */
.chapter-nav {
    display: flex;
    justify-content: space-between;
    align-items: stretch; /* botões nomeados sempre na mesma altura */
    gap: 1rem;
    margin-top: 0; /* o grid acima já dá o respiro — sem vazio acumulado */
    margin-bottom: 3rem;
    padding-top: 1.5rem;
    border-top: var(--border-solid);
}

.chapter-nav-link {
    text-decoration: none;
    padding: 0.5rem 1rem;
    min-height: 44px;
    display: inline-flex;
    align-items: center;
    flex: 1 1 0; /* navegação nomeada: botões gêmeos, sempre da mesma altura */
    max-width: 48%;
    font-size: 0.92rem;
    border: var(--border-solid);
    border-radius: var(--radius);
    color: var(--green-dark);
    font-weight: 700;
    transition: background-color 200ms var(--ease-out-quart), border-color 200ms var(--ease-out-quart);
}
.chapter-nav-link[rel="next"],
.chapter-nav-link:last-child {
    justify-content: flex-end;
    text-align: right;
    margin-left: auto;
}

.chapter-nav-link:hover {
    background-color: var(--surface-hover);
    border-color: var(--green);
}

/* --- Botões de PDF (cheat sheet premium) --- */
.pdf-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
    justify-content: center;
    margin: -0.75rem 0 2.25rem; /* colado à régua do header, sem boiar no vazio */
}

.pdf-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    min-height: 44px;
    padding: 0.5rem 1.1rem;
    border: var(--border-solid);
    border-radius: var(--radius);
    text-decoration: none;
    color: var(--green-dark);
    font-weight: 700;
    transition: background-color 200ms var(--ease-out-quart), border-color 200ms var(--ease-out-quart);
}

.pdf-btn:hover {
    background-color: var(--surface-hover);
    border-color: var(--green);
}

.pdf-btn svg {
    width: 18px;
    height: 18px;
    flex-shrink: 0;
}

/* --- CTA de afiliado Amazon (discreto, on-brand — gerado por afiliados/inserir_botao.py) --- */
.amazon-cta {
    margin-top: 2.5rem;
    padding-top: 1.75rem;
    border-top: var(--border-solid);
    text-align: center;
}

.amazon-cta-text {
    color: var(--gray-dark);
    margin: 0 auto 1rem;
    max-width: 50ch;
}

.amazon-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    min-height: 48px;
    padding: 0.7rem 1.6rem;
    border-radius: var(--radius);
    background: var(--green);
    color: var(--on-green);
    font-weight: 700;
    text-decoration: none;
    transition: filter 200ms var(--ease-out-quart), transform 200ms var(--ease-out-quart);
}

.amazon-btn:hover {
    filter: brightness(1.08);
    transform: translateY(-1px);
}

.amazon-btn:focus-visible {
    outline: 2px solid var(--green-dark);
    outline-offset: 2px;
}

.amazon-btn svg {
    width: 20px;
    height: 20px;
    flex-shrink: 0;
}

.amazon-cta-disc {
    color: var(--gray-dark);
    font-size: 0.78rem;
    line-height: 1.5;
    margin: 0.9rem auto 0;
    max-width: 52ch;
    opacity: 0.8;
}

/* --- Estante: link de compra discreto por card (aparece no hover) --- */
.shelf-item { position: relative; display: flex; flex-direction: column; }
.card-buy {
    position: absolute;
    top: 0.55rem;
    right: 0.55rem;
    z-index: 2;
    display: inline-flex;
    align-items: center;
    gap: 0.3rem;
    padding: 0.28rem 0.6rem;
    font-size: 0.76rem;
    font-weight: 700;
    text-decoration: none;
    color: var(--green-dark);
    background: var(--paper-bg);
    border: 1px solid var(--green);
    border-radius: 999px;
    opacity: 0;
    transform: translateY(-4px);
    transition: opacity 200ms var(--ease-out-quart), transform 200ms var(--ease-out-quart);
}
.card-buy svg { width: 15px; height: 15px; flex-shrink: 0; }
.shelf-item:hover .card-buy,
.card-buy:focus-visible { opacity: 1; transform: translateY(0); }
.card-buy:hover { background: var(--green); color: var(--on-green); }
/* Touch (sem hover): chip discreto sempre visível, sem deslocar layout */
@media (hover: none) {
    .card-buy { opacity: 0.92; transform: none; }
}

/* --- Modal Pix (liberação do PDF) --- */
.pix-overlay {
    position: fixed;
    inset: 0;
    background: rgb(0 0 0 / 0.55);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 1rem;
    z-index: 50;
}

.pix-modal {
    position: relative;
    background: var(--paper-bg);
    border: 2px dashed var(--green);
    border-radius: var(--radius);
    max-width: 430px;
    width: 100%;
    max-height: 92vh;
    overflow: auto;
    padding: 1.5rem;
    text-align: center;
}

.pix-amount {
    font-family: var(--font-display);
    font-weight: 800;
    font-size: 1.7rem;
    color: var(--green-dark);
    margin: 0.35rem 0 0.1rem;
}

.pix-lead {
    font-size: 0.92rem;
    color: var(--gray-dark);
    margin-bottom: 0.5rem;
}

.pix-qr {
    width: 230px;
    height: 230px;
    margin: 0.5rem auto;
    display: block;
    border: var(--border-solid);
    border-radius: var(--radius);
}

.pix-code {
    width: 100%;
    text-align: left;
    font-size: 0.7rem;
    color: var(--gray-dark);
    border: var(--border-solid);
    border-radius: var(--radius);
    padding: 0.5rem;
    margin: 0.5rem 0;
    max-height: 64px;
    overflow: auto;
    word-break: break-all;
}

.pix-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 0.6rem;
    justify-content: center;
    margin-top: 0.75rem;
}

.pix-note {
    font-size: 0.78rem;
    color: var(--gray-dark);
    margin-top: 0.7rem;
}

/* --- Card Details Typography --- */
.card-details-inner p {
    margin-bottom: 0.5rem;
    font-size: 0.95rem;
    color: var(--gray-dark);
}
.card-details-inner p:last-child {
    margin-bottom: 0;
}
.card-details-inner h3 {
    font-size: 0.95rem;
    color: var(--green-dark);
    letter-spacing: 0.02em;
    margin: 0.85rem 0 0.35rem;
}
.card-details-inner h3:first-child {
    margin-top: 0.5rem;
}

blockquote {
    font-family: var(--font-serif);
    font-style: italic;
    color: var(--gray-dark);
    border-left: 3px solid var(--green);
    padding-left: 1rem;
    margin: 0.75rem 0;
    font-size: 0.95rem;
}

/* --- Cards --- */
.card {
    border: 2px dashed var(--green);
    border-radius: var(--radius);
    padding: 1.5rem;
    display: flex;
    gap: 1.25rem;
    align-items: flex-start;
    background: transparent;
    transition: border-color 200ms var(--ease-out-quart);
}

.card-wide {
    grid-column: span 2;
}

.card-icon {
    width: 50px;
    height: 50px;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    color: var(--green);
}
.card-icon svg {
    width: 100%;
    height: 100%;
}

.card-content { flex: 1; min-width: 0; }

/* Título em pílula verde — como na referência. `inline-block` + `text-wrap:
   balance`: a pílula abraça o texto (curto = uma linha) e, quando precisa
   quebrar, divide o título em DUAS LINHAS EQUILIBRADAS dentro de um único
   retângulo — sem palavra órfã solta nem segunda pílula ragged. (O balance
   só funciona em inline-block/block, não em `display:inline`.) */
.card-title,
.lessons-title {
    display: inline-block;
    font-family: var(--font-display);
    font-size: 1.05rem;
    font-weight: 800;
    text-transform: uppercase;
    letter-spacing: 0.02em;
    line-height: 1.32;
    text-wrap: balance;
    background: var(--green);
    color: var(--on-green);
    padding: 0.3rem 0.95rem;
    border-radius: 8px;
}
.card-title + *,
.lessons-title + * {
    margin-top: 0.75rem;
}

/* Cards de alerta ("Cuidado") — pílula preta */
.card-warning .card-title {
    background: var(--black);
    color: var(--paper-bg);
}

.card-body {
    font-size: 1rem;
    color: var(--black);
    margin-bottom: 0.5rem;
}
.card-body strong { font-weight: 700; }

/* Dica prática — texto verde pequeno, como na referência */
.card-tip {
    color: var(--green-dark);
    font-weight: 500;
    font-size: 0.9rem;
    margin-top: 0.5rem;
}

/* --- Fluxo numerado (passo a passo) --- */
.cycle-flow {
    display: flex;
    flex-wrap: wrap;
    align-items: stretch;
    gap: 0.75rem;
    margin: 1rem 0;
}

.cycle-step {
    flex: 1 1 150px;
    display: flex;
    flex-direction: column;
    gap: 0.3rem;
    align-items: flex-start;
    border: var(--border-solid);
    border-radius: var(--radius);
    padding: 0.85rem;
    background: var(--paper-bg);
}

.cycle-number {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 1.7rem;
    height: 1.7rem;
    border-radius: 50%;
    background: var(--green);
    color: var(--on-green);
    font-family: var(--font-display);
    font-weight: 800;
    font-size: 0.9rem;
}

.cycle-desc {
    font-size: 0.85rem;
    color: var(--gray-dark);
}

.cycle-arrow {
    align-self: center;
    color: var(--green);
    font-weight: 800;
    font-size: 1.4rem;
    flex: 0 0 auto;
}

/* --- Lições-Chave (bloco largo tracejado) --- */
.lessons {
    border: 2px dashed var(--green);
    border-radius: var(--radius);
    padding: 1.5rem;
    margin-bottom: 3rem;
}

.lessons-list {
    list-style-type: square;
    margin-left: 1.25rem;
    color: var(--black);
    font-size: 0.95rem;
}
.lessons-list li {
    margin-bottom: 0.5rem;
}
.lessons-list li::marker {
    color: var(--green);
}

/* Non-card sections */
.section-block {
    margin-bottom: 3rem;
}
.section-title {
    color: var(--green-dark);
    font-family: var(--font-display);
    font-size: 1.8rem;
    font-weight: 800;
    margin-bottom: 1.5rem;
}

/* --- Footer (barra escura, como na referência) --- */
.footer {
    background: var(--footer-bg);
    color: var(--footer-text);
    border-radius: var(--radius);
    padding: 1.5rem;
    text-align: center;
}
.footer-connections {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    justify-content: center;
    align-items: center;
    margin-bottom: 1rem;
}
.footer-label {
    font-weight: 700;
    text-transform: uppercase;
    font-size: 0.75rem;
    letter-spacing: 0.06em;
}
.footer .tag {
    color: inherit;
    border-color: oklch(60% 0.01 152 / 0.6);
}
.footer-credit {
    color: inherit;
    opacity: 0.85;
    font-size: 0.9rem;
}
.footer-link {
    color: inherit;
    font-weight: 700;
    text-decoration: underline;
    text-underline-offset: 3px;
}

/* --- Skeleton Loader --- */
.skeleton {
    animation: pulse 1.5s infinite;
    background: var(--surface-hover);
    border-radius: var(--radius);
}
@keyframes pulse {
    0% { opacity: 0.6; }
    50% { opacity: 1; }
    100% { opacity: 0.6; }
}
.skeleton-card {
    aspect-ratio: 2 / 3.6; /* capa 2:3 + faixa de conteúdo */
    width: 100%;
}

/* =========================================
   ANIMATIONS & INTERACTIONS
   ========================================= */
@keyframes fade-in {
    from { opacity: 0; }
    to { opacity: 1; }
}

@keyframes slide-up-fade {
    from { opacity: 0; transform: translateY(5px); }
    to { opacity: 1; transform: translateY(0); }
}

.animate-entrance {
    opacity: 0;
    animation: slide-up-fade 600ms var(--ease-out-quint) forwards;
    animation-delay: calc(min(var(--i, 0) * 80ms, 600ms));
}

.animate-sequence {
    opacity: 0;
    animation: slide-up-fade 500ms var(--ease-out-quint) forwards;
    animation-delay: calc(200ms + min(var(--seq, 0) * 120ms, 800ms));
}

@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        animation-delay: 0ms !important;
    }
}

/* Hover Devices */
@media (hover: hover) {
    .back-link:hover {
        color: var(--green-dark);
        border-color: var(--green);
    }
    .back-link:hover .icon-arrow {
        transform: translateX(-3px);
    }
    .chapter-link:hover {
        background-color: var(--surface-hover);
    }
    .chapter-link:hover .arrow {
        transform: translateX(3px);
    }
    a.card:hover {
        transform: translateY(-2px);
        border-color: var(--green-dark);
    }
    a.card:hover .card-cover img {
        transform: scale(1.02);
    }
}

/* Touch Devices */
@media (hover: none) {
    a.card:active, .chapter-link:active {
        transform: scale(0.98);
        transition: transform 100ms;
    }
}

/* --- Responsive ---
   Três faixas: telefone ≤640 · tablet 641–900 · desktop >900 */

/* Tablet (iPad retrato, telefone paisagem): capítulos mantêm as 2 colunas
   densas do desktop; estante em 2 colunas largas com tipografia padrão. */
@media (min-width: 641px) and (max-width: 900px) {
    .page {
        padding: max(2rem, env(safe-area-inset-top)) max(2rem, env(safe-area-inset-right)) max(2rem, env(safe-area-inset-bottom)) max(2rem, env(safe-area-inset-left));
    }
    .header { padding: 0 0 2.5rem; margin-bottom: 2.5rem; }
    .card { padding: 1.25rem; gap: 1rem; }
    .card-icon { width: 40px; height: 40px; }
    .card-title, .lessons-title { font-size: 0.98rem; }
}
/* Só na faixa estreita do tablet retrato a estante desce para 2 colunas;
   de 800px em diante as 3 colunas do desktop já respiram. */
@media (min-width: 641px) and (max-width: 799px) {
    .shelf-grid { grid-template-columns: repeat(2, 1fr); gap: 1.5rem; }
}

@media (max-width: 640px) {
    .page {
        padding: max(1.25rem, env(safe-area-inset-top)) max(1.25rem, env(safe-area-inset-right)) max(1.25rem, env(safe-area-inset-bottom)) max(1.25rem, env(safe-area-inset-left));
        border: none; box-shadow: none;
    }
    .grid { columns: 1; column-gap: 1.5rem; margin-bottom: 2rem; }
    .grid > * { margin-bottom: 1.25rem; }
    .card-wide { grid-column: span 1; }

    /* Estante: livraria de bolso — 2 colunas de capas, 4 livros por tela */
    .shelf-grid { grid-template-columns: repeat(2, 1fr); gap: 1rem; }
    a.card .card-content { padding: 0.9rem; }
    a.card .card-title { font-size: 0.8rem; padding: 0.25rem 0.7rem; }
    .card-author { font-size: 0.8rem; margin-top: 0.6rem; }
    .card-progress { font-size: 0.68rem; padding-top: 0.6rem; }
    .library-controls { margin-bottom: 1.5rem; }

    /* Prólogo curto: o conteúdo aparece antes da primeira dobra acabar */
    .header { padding: 0 0 1.75rem; margin-bottom: 2rem; }
    .header-subtitle { font-size: 0.92rem; letter-spacing: 0.06em; }
    .header-credit { margin-bottom: 1rem; }
    .header-intro { font-size: 0.98rem; }
    .back-link { margin-bottom: 1.25rem; }
    .pdf-actions { margin: -0.5rem 0 1.75rem; }
    .pdf-btn { flex: 1 1 auto; justify-content: center; }

    /* Cards: ícone menor devolve largura ao texto */
    .card { padding: 1.25rem; gap: 1rem; }
    .card-icon { width: 40px; height: 40px; }
    .card-title, .lessons-title { font-size: 0.95rem; }
    .lessons { padding: 1.25rem; }
}

/* Grid Card Link Layout */
a.card {
    text-decoration: none;
    color: inherit;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    padding: 0;
    transition: transform 200ms var(--ease-out-quart), border-color 200ms var(--ease-out-quart);
}
.card-cover {
    width: 100%;
    aspect-ratio: 2 / 3; /* capa de livro inteira — nunca cortar o título */
    overflow: hidden;
    border-bottom: var(--border-solid);
    background: var(--surface-hover);
}
.card-cover img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: center;
    transition: transform 300ms var(--ease-out-quart);
}
a.card .card-content {
    padding: 1.5rem;
    flex: 1;
    display: flex;
    flex-direction: column;
}
a.card .card-title {
    font-size: 0.95rem;
}
a.card .card-body {
    margin-bottom: 1rem;
    font-size: 0.95rem;
}
/* Estante: autor e progresso em uma língua tipográfica só */
.card-author {
    color: var(--gray-dark);
    font-size: 0.92rem;
    margin-top: 0.75rem;
}
.card-progress {
    color: var(--green-dark);
    font-weight: 600;
    font-size: 0.82rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-top: auto;
    padding-top: 0.75rem;
}

/* Estante: card "Em breve" — livro candidato, ainda sem resumo. Não navega
   (sem href): só o chip "Comprar" leva à Amazon. O progresso vira um selo
   discreto em pílula tracejada verde, sinalizando que o resumo está por vir. */
a.card-soon { cursor: default; }
a.card-soon:hover { transform: none; border-color: var(--green); }
a.card-soon:hover .card-cover img { transform: none; }
.card-soon .card-progress {
    align-self: flex-start;
    color: var(--green-dark);
    border: 1px dashed var(--green);
    border-radius: 999px;
    padding: 0.22rem 0.7rem;
}

.tag-row {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-bottom: 0.5rem;
}

.tag {
    background: transparent;
    color: var(--gray-dark);
    padding: 0.2rem 0.6rem;
    border: var(--border-solid);
    border-radius: var(--radius);
    font-size: 0.85rem;
    font-weight: 600;
}

h1, h2, h3, h4 {
    text-transform: uppercase;
    font-weight: 800;
    font-family: var(--font-display);
}

/* --- Print --- */
@media print {
    html, body { background: white; }
    .page { max-width: none; padding: 0; }
    .skip-link, .back-link, .search-input, .chapter-nav, .pdf-actions { display: none; }
    .card, .lessons { break-inside: avoid; }
    .footer { background: none; color: var(--black); border-top: 2px solid var(--black); border-radius: 0; }
}