:root {
    --bg: #070a11;
    --surface: #171b22;
    --text: #dae0e7;
    --muted: #a8b3c7;
    --line: #2a3955;
    --accent: #7dd3fc;
    --header-offset: 6.5rem;
    --font-size-base: 1rem;
}

html[data-theme="light"] {
    --bg: #f8f9fa;
    --surface: #ffffff;
    --text: #1f2937;
    --muted: #6b7280;
    --line: #e5e7eb;
    --accent: #0ea5e9;
}

html[data-font="large"] {
    --font-size-base: 1.125rem;
}

* {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
    margin: 0;
}

body {
    margin: 0;
    font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    font-size: var(--font-size-base);
    color: var(--text);
    background-color: var(--bg);
}

.apenas-leitor-tela {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

.atalho-conteudo {
    position: absolute;
    left: 1rem;
    top: -3rem;
    z-index: 9999;
    background: var(--accent);
    color: #001420;
    padding: 0.6rem 0.9rem;
    border-radius: 0 0 6px 6px;
    text-decoration: none;
    font-weight: 700;
}

.atalho-conteudo:focus-visible {
    top: 0;
}

.container-pagina {
    width: min(1200px, 94%);
    margin: 0 auto;
}

.cabecalho {
    background-color: var(--surface);
    border-bottom: 1px solid var(--line);
    position: sticky;
    top: 0;
    z-index: 20;
}

.cabecalho > .container-pagina {
    display: grid;
    grid-template-columns: 1fr auto auto;
    grid-template-areas: "titulo controles menu-btn";
    align-items: center;
    gap: 0.8rem;
    padding: 0.8rem 0;
}

.cabecalho h1 {
    grid-area: titulo;
    line-height: 1.2;
}

.cabecalho .controles-cabecalho {
    grid-area: controles;
}

.controles-cabecalho {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.botao-menu,
#botaoAcessibilidade,
#botaoTema,
.botao-restaurar-acessibilidade {
    background: none;
    border: 1px solid var(--line);
    color: var(--text);
    cursor: pointer;
    padding: 0.5rem 0.75rem;
    border-radius: 6px;
    font-size: 1rem;
    transition: all 0.3s ease;
}

.botao-menu {
    display: none;
    grid-area: menu-btn;
}

.botao-menu:hover,
#botaoTema:hover,
#botaoAcessibilidade:hover,
.botao-restaurar-acessibilidade:hover {
    background-color: var(--surface);
    border-color: var(--accent);
}

.layout-curso {
    display: grid;
    grid-template-columns: minmax(220px, 260px) minmax(0, 1fr);
    gap: 1rem;
    align-items: start;
    padding: 1.2rem 0 2rem;
}

.sidebar-cursos {
    position: sticky;
    top: calc(var(--header-offset) + 0.35rem);
}

.titulo-sidebar {
    font-size: 1rem;
    margin: 0 0 0.75rem;
}

.menu-navegacao {
    border: 1px solid var(--line);
    background: var(--surface);
    border-radius: 10px;
    padding: 0.9rem;
}

.menu-navegacao.aberto {
    display: block;
}

.painel-acessibilidade {
    margin-bottom: 0.9rem;
    background: var(--surface);
    border: 1px solid var(--line);
    border-radius: 8px;
    padding: 1rem;
}

.painel-acessibilidade[hidden] {
    display: none !important;
}

.grade-acessibilidade {
    margin-top: 0.9rem;
    display: grid;
    grid-template-columns: repeat(2, minmax(180px, 1fr));
    gap: 0.8rem;
}

.grade-acessibilidade label {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.botao-restaurar-acessibilidade {
    margin-top: 0.9rem;
}

h1,
h2 {
    margin: 0;
}

h1 {
    font-size: 1.25rem;
}

nav ul {
    list-style: none;
    display: grid;
    gap: 0.45rem;
    margin: 0;
    padding: 0;
}

nav li {
    margin: 0;
}

nav a {
    display: block;
    line-height: 1.2;
    padding: 0.5rem 0.6rem;
    border-radius: 6px;
    border: 1px solid var(--line);
    background: color-mix(in srgb, var(--surface) 90%, var(--line));
    font-size: 0.92rem;
}

a {
    text-decoration: underline;
    color: var(--text);
}

h3 {
    margin: 1rem 0 0;
    font-size: 1.05rem;
}

a:hover,
a:focus-visible,
nav a:hover,
nav a:focus-visible,
.rodape a:hover {
    color: var(--accent);
}

a:focus-visible,
button:focus-visible,
input:focus-visible {
    outline: 3px solid var(--accent);
    outline-offset: 3px;
}

nav a {
    text-decoration: none;
    color: var(--muted);
}

nav a:hover,
nav a:focus-visible {
    border-color: var(--accent);
    background: color-mix(in srgb, var(--surface) 65%, var(--accent) 12%);
}

nav a[aria-current="page"],
nav a.link-ativo {
    color: var(--text);
    border-color: var(--accent);
    background: color-mix(in srgb, var(--surface) 55%, var(--accent) 22%);
    font-weight: 600;
}

.conteudo-principal {
    min-width: 0;
}

.secao-cartao {
    background-color: var(--surface);
    border-radius: 8px;
    padding: 1.25rem;
    margin-bottom: 1rem;
}

section[id] {
    scroll-margin-top: var(--header-offset);
}

p,
ul,
ol,
pre {
    margin-top: 0.75rem;
    margin-bottom: 0;
}

ol,
ul {
    padding-left: 1.2rem;
}

li + li {
    margin-top: 0.35rem;
}

.espaco-topo {
    margin-top: 1rem;
}

pre {
    overflow-x: auto;
    background-color: var(--bg);
    color: var(--text);
    padding: 0.9rem;
    border-radius: 6px;
}

.rodape {
    border-top: 1px solid var(--line);
    background-color: var(--surface);
    text-align: center;
}

.rodape .container-pagina {
    padding: 1rem 0 1.5rem;
    color: var(--muted);
    font-size: 0.95rem;
}

.rodape a {
    color: var(--muted);
}

.exemplo-flex {
    display: flex;
    gap: 1rem;
    margin-top: 1rem;
    flex-wrap: wrap;
}

.exemplo-flex div,
.exemplo-grid div {
    padding: 1rem;
    background-color: var(--bg);
    border: 1px dashed var(--accent);
    border-radius: 6px;
    text-align: center;
    color: var(--accent);
    font-weight: bold;
}

.exemplo-flex div {
    flex: 1;
    min-width: 150px;
}

.exemplo-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1rem;
    margin-top: 1rem;
}

html[data-contrast="high"] {
    --bg: #000000;
    --surface: #0b0b0b;
    --text: #ffffff;
    --muted: #f0f0f0;
    --line: #ffffff;
    --accent: #ffd500;
}

html[data-focus="strong"] a:focus-visible,
html[data-focus="strong"] button:focus-visible,
html[data-focus="strong"] input:focus-visible {
    outline: 4px solid #ff7a00;
    outline-offset: 4px;
}

html[data-links="underlined"] nav a,
html[data-links="underlined"] .rodape a,
html[data-links="underlined"] .secao-cartao a {
    text-decoration: underline;
    text-underline-offset: 3px;
    text-decoration-thickness: 2px;
}

@media (prefers-reduced-motion: reduce) {
    html {
        scroll-behavior: auto;
    }

    *,
    *::before,
    *::after {
        animation-duration: 0.001ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.001ms !important;
    }
}

html[data-motion="reduced"] {
    scroll-behavior: auto;
}

html[data-motion="reduced"] *,
html[data-motion="reduced"] *::before,
html[data-motion="reduced"] *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
}

@media (forced-colors: active) {
    .botao-menu,
    #botaoTema,
    #botaoAcessibilidade,
    .botao-restaurar-acessibilidade,
    .secao-cartao,
    .painel-acessibilidade {
        border: 1px solid CanvasText;
    }
}

@media (max-width: 900px) {
    :root {
        --header-offset: 6.2rem;
    }

    .layout-curso {
        grid-template-columns: 1fr;
        gap: 0.8rem;
        padding-top: 1rem;
    }

    .sidebar-cursos {
        position: static;
    }

    .titulo-sidebar {
        margin-bottom: 0.5rem;
    }

    .botao-menu {
        display: inline-flex;
        align-items: center;
        justify-content: center;
    }

    .menu-navegacao {
        display: none;
        position: fixed;
        top: calc(var(--header-offset) + 0.5rem);
        left: 1rem;
        right: 1rem;
        z-index: 35;
        max-height: calc(100vh - var(--header-offset) - 1.25rem);
        overflow: auto;
        padding: 0.8rem;
        box-shadow: 0 18px 40px rgba(0, 0, 0, 0.28);
    }

    .menu-navegacao.aberto {
        display: block;
    }

    .grade-acessibilidade,
    .exemplo-grid {
        grid-template-columns: 1fr;
    }
}