/* Site público no visual do mockup 01 (.docs/mockups/01-sidebar-oliva.html), claro e escuro.
   Folha completa: as páginas públicas não carregam o base.css, que fica só para o admin. */
:root {
    color-scheme: light dark;
    --bg: light-dark(#f5f5ef, #111511);
    --bar: light-dark(#fafbf6, #151a16);
    --surface: light-dark(#fffef9, #181e19);
    --surface-2: light-dark(#fcfcf7, #1c231d);
    --ink: light-dark(#222b27, #e3e8dd);
    --muted: light-dark(#69716b, #98a294);
    --line: light-dark(#dce0d5, #2b342c);
    --accent: light-dark(#4f6b3b, #b5d37a);
    --accent-strong: light-dark(#3d582f, #c9e29a);
    --accent-soft: light-dark(#e5ebdb, #253020);
    --icon-bg: light-dark(#e7e7de, #232b24);
    --code-inline: light-dark(#eef1e6, #232b24);
    --focus: #72954c;
    --lime: #d8f58e;
    --hero: light-dark(#24322a, #1d2820);
    --hero-ink: #f4f7ed;
    --hero-muted: #c5cec3;
    --tip-bg: light-dark(#f0f4e8, #1d271b);
    --tip-line: #8ea967;
    --tip-ink: light-dark(#435339, #c3d2b0);
    --warn-bg: light-dark(#f8f1e3, #2a2416);
    --warn-line: #c89b4a;
    --warn-ink: light-dark(#5d4a26, #e0c99a);
    --code-bg: light-dark(#19221f, #0e1411);
    --code-ink: #dde9de;
    --easy-bg: light-dark(#e5ebdb, #25321f);
    --easy-ink: light-dark(#3d582f, #b5d37a);
    --medium-bg: light-dark(#f6ecd2, #33290f);
    --medium-ink: light-dark(#7a5a12, #e6c06a);
    --hard-bg: light-dark(#f4dcd6, #3a1d17);
    --hard-ink: light-dark(#8a3324, #f0a08e);
    --mono: 'JetBrains Mono', ui-monospace, SFMono-Regular, Consolas, monospace;
}

/* Tema escolhido no botão (public/js/theme.js); sem escolha, vale o do sistema */
:root[data-theme="light"] { color-scheme: light; }
:root[data-theme="dark"] { color-scheme: dark; }

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

body {
    margin: 0;
    background: var(--bg);
    color: var(--ink);
    font: 15px/1.65 'Inter', system-ui, -apple-system, sans-serif;
    min-height: 100dvh;
}

h1, h2, h3, p, ul, ol, pre, figure {
    margin: 0;
}

a {
    color: var(--accent);
}

button {
    font: inherit;
    cursor: pointer;
}

button:focus-visible, a:focus-visible, summary:focus-visible, textarea:focus-visible {
    outline: 3px solid var(--focus);
    outline-offset: 4px;
}

[hidden] {
    display: none !important;
}

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

.eyebrow {
    font-size: 11px;
    font-weight: 750;
    letter-spacing: 1.7px;
    text-transform: uppercase;
    color: var(--muted);
}

code, pre {
    font-family: var(--mono);
}

:not(pre) > code {
    font-size: 0.87em;
    background: var(--code-inline);
    border-radius: 4px;
    padding: 1px 5px;
}

/* Cabeçalho */
.site-header {
    min-height: 84px;
    border-bottom: 1px solid var(--line);
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-between;
    gap: 12px 24px;
    padding: 0 4vw;
    background: var(--bar);
}

.logo {
    display: inline-flex;
    align-items: center;
    font-size: 21px;
    font-weight: 800;
    letter-spacing: -1px;
    color: var(--ink);
    text-decoration: none;

    & b {
        color: light-dark(#678141, #a9c977);
    }

    & span {
        display: inline-grid;
        place-items: center;
        background: light-dark(var(--ink), #2a352c);
        color: var(--lime);
        border-radius: 7px;
        width: 34px;
        height: 34px;
        margin-right: 10px;
        font: 700 16px monospace;
        letter-spacing: 0;
    }
}

.main-nav {
    display: flex;
    gap: 4px;

    & a, & button {
        display: inline-flex;
        align-items: center;
        gap: 6px;
        color: var(--muted);
        text-decoration: none;
        font: inherit;
        font-size: 13px;
        font-weight: 650;
        padding: 8px 12px;
        border: 0;
        border-radius: 8px;
        background: none;
        cursor: pointer;

        &:hover, &[aria-current="page"] {
            background: var(--accent-soft);
            color: var(--accent-strong);
        }
    }
}

.topnote {
    color: var(--muted);
    font-size: 12px;
    letter-spacing: 0.5px;
}

/* Estrutura: sidebar + conteúdo */
.shell {
    display: grid;
    grid-template-columns: 255px minmax(0, 1fr);
    max-width: 1550px;
    margin: auto;
    min-height: calc(100dvh - 84px);
}

.sidebar {
    padding: 34px 24px;
    border-right: 1px solid var(--line);
}

.side-nav {
    display: grid;
    gap: 8px;
    margin: 16px 0 34px;

    & a {
        display: flex;
        align-items: center;
        gap: 12px;
        padding: 10px 15px;
        border-radius: 8px;
        color: var(--ink);
        text-decoration: none;

        &:hover {
            background: var(--surface-2);
        }

        &[aria-current] {
            background: var(--accent-soft);
            color: var(--accent-strong);
            font-weight: 700;
        }
    }

    & small {
        margin-left: auto;
        color: var(--muted);
    }
}

.icon {
    display: inline-grid;
    place-items: center;
    flex: none;
    width: 27px;
    height: 27px;
    border-radius: 6px;
    background: var(--icon-bg);
    font: 700 12px monospace;

    & .lang-icon {
        width: 15px;
        height: 15px;
    }
}

.sidecard {
    border-top: 1px solid var(--line);
    padding-top: 22px;

    & + .sidecard {
        margin-top: 22px;
    }
    color: var(--muted);
    font-size: 12px;

    & strong {
        display: block;
        color: var(--ink);
        font-size: 15px;
        margin: 8px 0;
    }

    & p {
        margin-bottom: 10px;
    }

    & a {
        font-weight: 650;
    }
}

.content {
    padding: 38px 46px;
    min-width: 0;
}

/* Introdução de cada página */
.intro {
    display: flex;
    align-items: end;
    justify-content: space-between;
    gap: 18px;
    margin-bottom: 28px;

    & h1 {
        font-size: 36px;
        line-height: 1.2;
        letter-spacing: -1.5px;
        margin: 9px 0 12px;
    }
}

.day-nav {
    display: grid;
    justify-items: end;
    gap: 8px;

    & .date {
        font-size: 12px;
        white-space: nowrap;
        text-transform: capitalize;
    }

    & div {
        display: flex;
        gap: 6px;
    }
}

/* Botões e links com cara de botão */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    border: 1px solid var(--line);
    background: var(--surface);
    color: var(--ink);
    border-radius: 8px;
    padding: 10px 15px;
    text-decoration: none;
    font-size: 13px;

    &:hover {
        filter: brightness(0.95);
    }

    &.small {
        padding: 6px 12px;
        font-size: 12px;
    }

    &[aria-disabled="true"] {
        opacity: 0.45;
        pointer-events: none;
    }
}

.primary {
    background: var(--lime);
    color: #23321d;
    border-color: var(--lime);
    font-weight: 700;
    white-space: nowrap;
}

/* Destaque da lição (hero escuro) */
.hero {
    background: var(--hero);
    color: var(--hero-ink);
    border-radius: 14px;
    padding: 29px 32px;
    position: relative;
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 20px;
    border: 1px solid light-dark(transparent, #2e3c31);

    &::after {
        content: '{ }';
        position: absolute;
        right: 28px;
        top: -46px;
        font: 180px monospace;
        color: #ffffff05;
        pointer-events: none;
    }

    & .eyebrow {
        color: var(--lime);
    }

    & h1 {
        font-size: 29px;
        line-height: 1.3;
        letter-spacing: -0.6px;
        margin: 12px 0 7px;
    }

    & p {
        color: var(--hero-muted);
        margin: 0 0 17px;
        max-width: 560px;
    }

    /* O resumo tem `código`: o fundo claro do código inline sumiria no destaque escuro */
    & code {
        background: #ffffff14;
        color: var(--lime);
    }

    & .hero-actions {
        position: relative;
        z-index: 1;
        display: grid;
        gap: 10px;
        justify-items: stretch;
        text-align: center;
    }

    & .btn {
        justify-content: center;
    }
}

/* Botão secundário sobre o fundo escuro do destaque */
.btn.ghost {
    background: transparent;
    border-color: #ffffff30;
    color: var(--hero-ink);
    white-space: nowrap;

    &:hover {
        background: #ffffff12;
        filter: none;
    }
}

.pills {
    display: flex;
    flex-wrap: wrap;
    gap: 7px;
}

.pill {
    display: inline-flex;
    align-items: center;
    gap: 5px;
    font-size: 11px;
    border: 1px solid #ffffff30;
    border-radius: 5px;
    padding: 2px 8px;
    color: #e6eddf;

    & .lang-icon {
        background-color: #e6eddf;
    }
}

.stats {
    display: flex;
    flex-wrap: wrap;
    gap: 8px 26px;
    font-size: 12px;
    color: var(--muted);
    padding: 18px 1px 25px;

    & b {
        color: var(--ink);
    }
}

/* Leitor: a lição completa */
.reader {
    background: var(--surface);
    border: 1px solid var(--line);
    border-radius: 12px;
    padding: 30px;
    scroll-margin-top: 20px;

    & h2 {
        font-size: 30px;
        line-height: 1.3;
        letter-spacing: -0.6px;
        margin: 9px 0;
    }

    & h3 {
        font-size: 17px;
        line-height: 1.4;
        margin: 8px 0;
    }

    & p, & .md {
        color: light-dark(#576158, #b9c2b3);
    }

    & .md > * + * {
        margin-top: 10px;
    }

    & .md pre {
        margin-top: 10px;
    }
}

.readertop {
    display: flex;
    justify-content: space-between;
    gap: 12px;
}

.lead {
    font-size: 16px;
}

.rule {
    border: 0;
    border-top: 1px solid var(--line);
    margin: 25px 0;
}

.tip {
    padding: 16px 19px;
    border-left: 3px solid var(--tip-line);
    background: var(--tip-bg);
    border-radius: 0 6px 6px 0;
    margin: 22px 0;
    color: var(--tip-ink);

    & ul {
        margin-top: 6px;
        padding-left: 18px;
    }

    &.warn {
        border-left-color: var(--warn-line);
        background: var(--warn-bg);
        color: var(--warn-ink);
    }
}

.number {
    color: light-dark(#7c9070, #8fa682);
    font: 13px var(--mono);
    margin-right: 8px;
}

/* Bloco de código com barra (arquivo + copiar) */
.codebox {
    position: relative;
    background: var(--code-bg);
    border-radius: 9px;
    margin: 14px 0 22px;
    overflow: hidden;

    & pre {
        overflow: auto;
        padding: 20px;
        color: var(--code-ink);
        font: 13px/1.85 var(--mono);
        tab-size: 4;
    }
}

.codebar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 8px;
    border-bottom: 1px solid #ffffff10;
    color: #a3afa7;
    padding: 7px 15px;
    font: 11px var(--mono);

    & span {
        display: inline-flex;
        align-items: center;
        gap: 6px;
    }

    & .lang-icon {
        background-color: color-mix(in srgb, var(--lang, #a3afa7) 55%, white);
    }

    & button {
        font: 11px system-ui;
        background: transparent;
        color: #c5d1c6;
        border: 0;
        border-radius: 6px;
        padding: 3px 8px;

        &:hover {
            background: #ffffff12;
        }
    }
}

.tok-comment { color: #84988c; font-style: italic; }
.tok-string { color: #c7df98; }
.tok-keyword { color: #c5b4ee; }
.tok-number { color: #e5b583; }

/* Exercícios */
.exercise {
    margin: 24px 0;
}

.level {
    display: inline-block;
    font: 700 10px monospace;
    letter-spacing: 0.5px;
    text-transform: uppercase;
    border-radius: 5px;
    padding: 2px 7px;
    margin-left: 8px;
    vertical-align: middle;

    &.level-easy { background: var(--easy-bg); color: var(--easy-ink); }
    &.level-medium { background: var(--medium-bg); color: var(--medium-ink); }
    &.level-hard { background: var(--hard-bg); color: var(--hard-ink); }
}

.draft {
    display: grid;
    gap: 6px;
    margin: 12px 0 4px;
    font-size: 12px;
    color: var(--muted);

    & textarea {
        width: 100%;
        min-height: 130px;
        padding: 12px 14px;
        border: 1px dashed light-dark(#b9c2ad, #3b473b);
        border-radius: 9px;
        background: var(--surface-2);
        color: var(--ink);
        font: 13px/1.7 var(--mono);
        tab-size: 4;
        resize: vertical;

        &::placeholder {
            color: var(--muted);
        }
    }
}

details {
    border: 1px solid var(--line);
    border-radius: 9px;
    padding: 0 18px;
    margin: 12px 0;
    background: var(--surface-2);

    & p {
        font-size: 13px;
        padding-bottom: 14px;
    }

    & .codebox {
        margin-top: 0;
    }
}

summary {
    padding: 16px 0;
    cursor: pointer;
    list-style: none;
    font-size: 13px;
    font-weight: 650;

    &::-webkit-details-marker {
        display: none;
    }

    &::after {
        content: '＋';
        float: right;
        color: var(--accent);
    }

    details[open] > &::after {
        content: '−';
    }
}

/* Fim da lição: trilha e sorteio */
.finish {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 18px;
    border-top: 1px solid var(--line);
    padding-top: 23px;
    margin-top: 30px;

    & .trail {
        display: grid;
        grid-template-columns: 1fr 1fr;
        gap: 10px;
        flex: 1;
    }

    & .actions {
        display: grid;
        gap: 8px;
        justify-items: end;

        & a:not(.btn) {
            font-weight: 650;
            font-size: 13px;
        }
    }
}

.trail-link {
    display: block;
    border: 1px solid var(--line);
    border-radius: 9px;
    padding: 12px 15px;
    color: var(--ink);
    text-decoration: none;
    background: var(--surface-2);

    & small {
        display: block;
        color: var(--muted);
    }

    &:is(a):hover {
        border-color: var(--focus);
    }

    &.next {
        text-align: right;
    }

    &.empty {
        border-style: dashed;
        color: var(--muted);
    }
}

/* Cabeçalho de seção com ação ao lado */
.sectionhead {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-between;
    gap: 14px;
    margin-bottom: 15px;

    & h2 {
        font-size: 19px;
        letter-spacing: -0.6px;
    }
}

/* Filtros em linha (arquivo) */
.filters {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    margin-bottom: 18px;

    & a {
        display: inline-flex;
        align-items: center;
        gap: 6px;
        padding: 6px 12px;
        border: 1px solid var(--line);
        border-radius: 8px;
        background: var(--surface);
        color: var(--ink);
        text-decoration: none;
        font-size: 12px;

        &[aria-current] {
            background: var(--accent-soft);
            border-color: var(--focus);
            color: var(--accent-strong);
            font-weight: 700;
        }
    }
}

/* Cards (arquivo, linguagens, guias) */
.cards {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 12px;
    margin-bottom: 28px;
}

.card {
    display: flex;
    flex-direction: column;
    gap: 9px;
    min-height: 150px;
    padding: 17px 15px;
    border: 1px solid var(--line);
    border-radius: 8px;
    background: var(--surface);
    color: var(--ink);
    text-decoration: none;

    &:hover {
        border-color: var(--focus);
        box-shadow: 0 0 0 1px var(--focus);
    }

    & .language {
        display: flex;
        align-items: center;
        gap: 6px;
        font: 700 11px monospace;
        color: var(--accent);
    }

    & strong {
        font-size: 14px;
        line-height: 1.45;
    }

    & small {
        font-size: 11px;
        color: var(--muted);
        margin-top: auto;
    }

    &.big strong {
        font-size: 18px;
    }

    &.selected {
        border-color: var(--focus);
        box-shadow: 0 0 0 1px var(--focus);
    }
}

/* Título do destaque quando a página já tem um h1 (trilha) */
.hero .hero-title {
    font-size: 29px;
    line-height: 1.3;
    letter-spacing: -0.6px;
    margin: 12px 0 7px;
}

.intro h1 .lang-swatch {
    vertical-align: middle;
    margin-right: 6px;
}

.recent {
    margin-top: 28px;
}

.trail-head {
    margin-top: 28px;
}

.back {
    margin-bottom: 8px;
    font-size: 13px;
    font-weight: 650;
}

/* Listas numeradas (trilha) */
.steps {
    list-style: none;
    padding: 0;

    & li + li {
        border-top: 1px solid var(--line);
    }

    & a {
        display: flex;
        flex-wrap: wrap;
        align-items: center;
        gap: 6px 12px;
        padding: 14px 4px;
        color: var(--ink);
        text-decoration: none;

        &:hover strong {
            color: var(--accent);
        }
    }

    & .meta {
        margin-left: auto;
        font-size: 12px;
        color: var(--muted);
    }
}

/* Paginação */
.pagination {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 6px;

    & a, & span {
        display: inline-flex;
        align-items: center;
        justify-content: center;
        gap: 4px;
        min-width: 38px;
        padding: 6px 12px;
        border: 1px solid var(--line);
        border-radius: 8px;
        background: var(--surface);
        color: var(--ink);
        text-decoration: none;
        font-size: 13px;
    }

    & a:hover {
        border-color: var(--focus);
    }

    & .current {
        background: var(--accent-soft);
        border-color: var(--focus);
        color: var(--accent-strong);
        font-weight: 700;
    }

    & .disabled {
        opacity: 0.45;
    }
}

/* Páginas de mensagem: erros, manutenção e cadastro fechado (errors/message.njk) */
.message-page {
    display: grid;
    place-items: center;
    min-height: calc(100dvh - 84px);
    padding: 40px 16px;
}

.message-card {
    position: relative;
    overflow: hidden;
    width: min(620px, 100%);
    display: grid;
    justify-items: center;
    gap: 12px;
    text-align: center;
    padding: 40px 36px 34px;
    border-radius: 18px;
    background: var(--hero);
    color: var(--hero-ink);
    border: 1px solid light-dark(transparent, #2e3c31);

    /* Mesmo enfeite do destaque da lição */
    &::after {
        content: '{ }';
        position: absolute;
        right: 22px;
        top: -50px;
        font: 180px monospace;
        color: #ffffff06;
        pointer-events: none;
    }

    & .eyebrow {
        color: var(--lime);
    }

    & h1 {
        font-size: 30px;
        line-height: 1.25;
        letter-spacing: -0.6px;
    }

    & p {
        color: var(--hero-muted);
        max-width: 470px;
    }
}

.message-icon {
    display: grid;
    place-items: center;
    width: 72px;
    height: 72px;
    border-radius: 50%;
    background: color-mix(in srgb, var(--lime) 16%, transparent);
    color: var(--lime);
    font-size: 32px;
    margin-bottom: 4px;
}

/* Erros de servidor em tom de alerta; manutenção com a ferramenta girando devagar */
.message-serverError .message-icon {
    background: #f0806c26;
    color: #f4a291;
}

.message-maintenance .message-icon i {
    animation: message-wobble 2.6s ease-in-out infinite;
}

@keyframes message-wobble {
    0%, 100% { transform: rotate(-12deg); }
    50% { transform: rotate(12deg); }
}

.message-terminal {
    width: 100%;
    margin-top: 10px;
    text-align: left;
    border-radius: 10px;
    background: var(--code-bg);
    border: 1px solid #ffffff12;
    overflow: hidden;

    & pre {
        padding: 14px 18px;
        overflow: auto;
        color: var(--code-ink);
        font: 12.5px/1.8 var(--mono);
        white-space: pre-wrap;
    }
}

.message-terminal-bar {
    display: flex;
    gap: 6px;
    padding: 9px 12px;
    border-bottom: 1px solid #ffffff10;

    & span {
        width: 10px;
        height: 10px;
        border-radius: 50%;
        background: #ffffff26;
    }

    & span:first-child { background: #f0806c; }
    & span:nth-child(2) { background: #e5c07b; }
    & span:last-child { background: var(--lime); }
}

.message-cursor {
    color: var(--lime);
    animation: message-blink 1.1s steps(1) infinite;
}

@keyframes message-blink {
    50% { opacity: 0; }
}

@media (prefers-reduced-motion: reduce) {
    .message-maintenance .message-icon i, .message-cursor {
        animation: none;
    }
}

.message-actions {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 10px;
    margin-top: 10px;
}

/* Faixa para o admin que vê o site durante a manutenção */
.maintenance-strip {
    padding: 9px 4vw;
    background: #e5c07b;
    color: #3a2a06;
    font-size: 13px;
    font-weight: 650;
    text-align: center;

    & a {
        color: inherit;
    }
}

/* Markdown dos guias */
.prose {
    line-height: 1.7;

    & > * + * {
        margin-top: 14px;
    }

    & h1, & h2, & h3, & h4 {
        line-height: 1.3;
        margin-top: 28px;
        color: var(--ink);
    }

    & h2 {
        font-size: 22px;
        padding-bottom: 6px;
        border-bottom: 1px solid var(--line);
    }

    & h3 {
        font-size: 17px;
    }

    & > :first-child {
        margin-top: 0;
    }

    & ul, & ol {
        padding-left: 24px;
    }

    & li + li {
        margin-top: 4px;
    }

    & pre {
        background: var(--code-bg);
        color: var(--code-ink);
        border-radius: 9px;
        padding: 18px 20px;
        overflow: auto;
        font: 13px/1.75 var(--mono);
    }

    & blockquote {
        margin: 0;
        border-left: 3px solid var(--tip-line);
        padding: 12px 16px;
        background: var(--tip-bg);
        color: var(--tip-ink);
        border-radius: 0 6px 6px 0;
    }

    & table {
        border-collapse: collapse;

        & th, & td {
            border: 1px solid var(--line);
            padding: 6px 10px;
        }

        & tbody tr:nth-child(even) {
            background: color-mix(in srgb, var(--accent-soft) 45%, transparent);
        }
    }

    & img {
        max-width: 100%;
    }
}

/* Ícones das linguagens: SVG como máscara, na cor da linguagem (langs.css define --lang e --icon) */
.lang-icon, .lang-dot {
    display: inline-block;
    flex: none;
    width: 1.1em;
    height: 1.1em;
    vertical-align: -0.15em;
    background-color: light-dark(var(--lang, var(--muted)), color-mix(in srgb, var(--lang, var(--muted)) 55%, white));
}

.lang-icon {
    mask: var(--icon) center / contain no-repeat;
}

.lang-dot {
    width: 0.7em;
    height: 0.7em;
    border-radius: 50%;
    vertical-align: 0.05em;
}

.lang-swatch {
    display: inline-grid;
    place-items: center;
    flex: none;
    width: 42px;
    height: 42px;
    border-radius: 10px;
    background: color-mix(in srgb, var(--lang, var(--muted)) 14%, transparent);

    & .lang-icon {
        width: 60%;
        height: 60%;
    }
}

/* Aviso rápido (código copiado) */
.toast {
    position: fixed;
    bottom: 24px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--hero);
    color: #fff;
    border-radius: 8px;
    padding: 11px 22px;
    z-index: 10;
    box-shadow: 0 5px 20px #0002;
}

.site-footer {
    font-size: 11px;
    color: var(--muted);
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    gap: 8px;
    padding: 28px 0 0;
}

@media (min-width: 1400px) {
    .content { padding: 38px 65px; }
}

@media (max-width: 1100px) {
    .content { padding: 30px 25px; }
    .cards { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .shell { grid-template-columns: 215px minmax(0, 1fr); }
    .hero { display: block; }
    .hero .hero-actions { margin-top: 16px; display: flex; flex-wrap: wrap; }
    .main-nav :is(a, button) { padding: 6px 8px; }
    .topnote { display: none; }
}

@media (max-width: 700px) {
    .site-header { padding: 14px 20px; }
    .main-nav { width: 100%; overflow: auto; }
    .shell { display: block; }
    .sidebar { padding: 18px 20px; border: 0; border-bottom: 1px solid var(--line); }
    .sidebar > .eyebrow, .sidecard { display: none; }
    .side-nav { display: flex; overflow: auto; margin: 0; gap: 5px; }
    .side-nav a { white-space: nowrap; padding: 8px 10px; font-size: 12px; }
    .side-nav small, .side-nav .icon { display: none; }
    .content { padding: 26px 18px; }
    .intro { flex-direction: column; align-items: start; }
    .intro h1 { font-size: 29px; }
    .day-nav { justify-items: start; }
    .hero { padding: 24px; }
    .hero h1 { font-size: 25px; }
    .reader { padding: 22px 18px; }
    .reader h2 { font-size: 25px; }
    .readertop { display: block; }
    .finish { align-items: start; flex-direction: column; }
    .finish .trail { grid-template-columns: 1fr; width: 100%; }
    .finish .actions { justify-items: start; }
    .site-footer { display: block; }
    .cards { gap: 9px; }
    .card { padding: 13px; min-height: 135px; }
}

@media (prefers-reduced-motion: no-preference) {
    html { scroll-behavior: smooth; }
}

/* Formato card: explicação dos exemplos, saída esperada e solução em Markdown */
.reader .md pre {
    overflow: auto;
    padding: 18px 20px;
    border-radius: 9px;
    background: var(--code-bg);
    color: var(--code-ink);
    font: 13px/1.85 var(--mono);
    tab-size: 4;
}

.codebox.output pre {
    padding: 14px 20px;
    color: #c7df98;
}

.solution {
    padding-bottom: 16px;

    & h3 {
        font-size: 15px;
        margin-top: 18px;
    }

    & ol, & ul {
        padding-left: 20px;
    }
}

/* Progresso local: "Já estudei" na lição e ✓ nos cards da trilha */
.studied {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-size: 13px;
    color: var(--muted);
    cursor: pointer;

    & input {
        accent-color: var(--accent);
    }
}

.card.done strong::after {
    content: ' ✓';
    color: var(--accent);
}