/* Landing do Linux Flow. As cores são as do app: os mesmos tokens de css/refresh.css e
 * css/playful.css, no tema escuro (padrão) e no claro. Cada área usa a cor que tem no app:
 * o azul do Laboratório, o céu das lições, o sol do quiz, o coral da comunidade e o dourado
 * do Premium. Um só elemento chama atenção: a mesa-07, com o terminal de verdade. */
@font-face {
  font-family: "Ubuntu Sans";
  src: url("../assets/fonts/UbuntuSans-Variable.ttf") format("truetype");
  font-weight: 100 800;
  font-stretch: 75% 100%;
  font-display: swap;
}

:root {
  /* O terminal fica escuro nos dois temas, como o terminal de demonstração do app. */
  --term-bg: #141b1f;
  --term-text: #ecf0e8;
  --term-muted: #a6b2b8;
  --term-dim: #8e9ba2;
  --term-rule: #303b41;
  --term-line: #354047;
  --term-prompt: #c1d5a4;
  --term-error: #efaaa2;
  --term-button: #26322c;
  --term-button-line: #465347;
  --mono: "Ubuntu Sans Mono", "Ubuntu Mono", "DejaVu Sans Mono", "Cascadia Mono", Consolas, monospace;
  --gutter: clamp(1rem, 4vw, 2.5rem);

  /* Tema escuro, o padrão da landing. */
  color-scheme: dark;
  --bg: #171c21;
  --surface: #20272e;
  --surface-2: #29323a;
  --deep: #0d1216;
  --text: #f2f4ee;
  --text-muted: #acb8bd;
  --rule: #354047;
  --accent: #c1d5a4;
  --on-accent: #1c2a1d;
  --floor: #0d1216;
  --gold: #d9b779;
  --sky: #9ac9de;
  --sun: #e5c47f;
  --coral: #e9a28d;
  --lab-blue: #9ab9cc;
  --mark-no: #69787c;
}

:root[data-theme="light"] {
  color-scheme: light;
  --bg: #f4f6f5;
  --surface: #ffffff;
  --surface-2: #e9eeeb;
  --deep: #e9eeeb;
  --text: #202b29;
  --text-muted: #5a6967;
  --rule: #d1dad5;
  --accent: #345c42;
  --on-accent: #ffffff;
  --floor: #d5ded8;
  --gold: #8a621c;
  --sky: #28677f;
  --sun: #805c12;
  --coral: #a14a32;
  --lab-blue: #355d73;
  --mark-no: #9aa9a3;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 400 1.0625rem/1.65 "Ubuntu Sans", "Segoe UI", system-ui, sans-serif;
  font-stretch: 100%;
}
img { display: block; max-width: 100%; height: auto; }
figure { margin: 0; }
a { color: var(--accent); text-underline-offset: 0.18em; text-decoration-thickness: 1px; }
a:hover { text-decoration-thickness: 2px; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; }
h1, h2, h3 { margin: 0; text-wrap: balance; }
p { margin: 0; max-width: 66ch; }
code { font-family: var(--mono); font-size: 0.92em; }
.sr-only {
  position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0;
}
.skip {
  position: absolute; left: var(--gutter); top: -4rem; z-index: 5;
  padding: 0.6rem 0.9rem; border-radius: 10px; background: var(--accent); color: var(--on-accent);
}
.skip:focus { top: 0.75rem; }
.wrap { width: min(100% - 2 * var(--gutter), 1180px); margin-inline: auto; }

/* Escala tipográfica: a Ubuntu Sans estreita nos títulos e larga no texto. */
h1 {
  font-size: clamp(2.6rem, 1.4rem + 4.8vw, 5.1rem);
  font-stretch: 75%;
  font-weight: 720;
  line-height: 0.98;
  letter-spacing: -0.015em;
}
h2 {
  font-size: clamp(1.85rem, 1.25rem + 2.1vw, 2.75rem);
  font-stretch: 80%;
  font-weight: 690;
  line-height: 1.05;
  letter-spacing: -0.01em;
}
h3 {
  font-size: 1.3rem;
  font-stretch: 88%;
  font-weight: 650;
  line-height: 1.2;
}

/* Ações. A principal tem o mesmo relevo dos botões do app; a secundária leva a cor da área. */
.button {
  display: inline-flex; align-items: center; justify-content: center;
  min-height: 48px; padding: 0.65rem 1.2rem;
  border: 2px solid transparent; border-radius: 11px;
  font-weight: 700; font-stretch: 92%; line-height: 1.2; text-decoration: none;
}
.button-primary {
  border: 1px solid color-mix(in srgb, var(--accent) 70%, var(--on-accent));
  border-bottom-width: 3px;
  background: var(--accent); color: var(--on-accent);
  box-shadow: 0 3px 0 var(--floor);
}
.button-primary:hover { color: var(--on-accent); filter: brightness(1.06); }
.button-primary:active { transform: translateY(2px); box-shadow: 0 1px 0 var(--floor); }
.button-line { border-color: var(--area, var(--accent)); color: var(--area, var(--accent)); }
.button-line:hover { background: var(--surface-2); color: var(--text); }
.actions { display: flex; flex-wrap: wrap; gap: 0.75rem; }
.text-link { font-weight: 600; justify-self: start; color: var(--area, var(--accent)); }
.text-link:hover { color: var(--area, var(--accent)); }

/* Cabeçalho. Em telas estreitas, os controles descem para uma segunda linha
 * em vez de alargar a página. */
.site-head { border-bottom: 2px solid var(--rule); }
.head-row { display: flex; flex-wrap: wrap; align-items: center; gap: 0.6rem 1.25rem; min-height: 70px; padding-block: 0.6rem; }
.brand {
  display: inline-flex; align-items: center; gap: 0.6rem; flex: none;
  color: var(--text); text-decoration: none;
  font-weight: 700; font-stretch: 88%; font-size: 1.15rem;
}
.brand:hover { color: var(--text); }
.brand-mark {
  display: inline-grid; place-items: center; width: 2.1rem; height: 2.1rem;
  border-radius: 9px; background: var(--accent); color: var(--on-accent);
  box-shadow: 0 3px 0 var(--floor);
  font: 700 0.92rem/1 var(--mono);
}
.brand-accent { color: var(--text); font-weight: 450; }
.head-nav { display: none; gap: 1.5rem; margin-left: 1.25rem; }
.head-nav a { color: var(--text); text-decoration: none; font-size: 0.98rem; }
.head-nav a:hover { color: var(--accent); text-decoration: underline; }
.head-actions { display: flex; align-items: center; gap: 0.9rem; margin-left: auto; }
.theme-toggle {
  display: inline-grid; place-items: center; flex: none; width: 40px; height: 40px; padding: 0;
  border: 1px solid var(--rule); border-radius: 10px; background: var(--surface); color: var(--text);
  cursor: pointer;
}
.theme-toggle:hover { border-color: var(--accent); color: var(--accent); }
.theme-toggle svg { width: 20px; height: 20px; }
/* O ícone mostra o tema que o botão ativa, como diz o rótulo. */
.theme-icon-moon { display: none; }
:root[data-theme="light"] .theme-icon-sun { display: none; }
:root[data-theme="light"] .theme-icon-moon { display: block; }
.language {
  font: inherit; font-size: 0.92rem; color: var(--text);
  border: 1px solid var(--rule); border-radius: 10px; background: var(--surface);
  padding: 0.4rem 0.5rem; min-height: 40px;
}
.head-login { color: var(--text); font-weight: 600; text-decoration: none; }
.head-login:hover { color: var(--text); text-decoration: underline; }
.head-start { min-height: 42px; padding: 0.5rem 1rem; }
@media (max-width: 639px) { .head-start { display: none; } }
@media (max-width: 599px) {
  .head-row { column-gap: 0.75rem; }
  .head-actions { gap: 0.5rem; }
  .brand { gap: 0.5rem; font-size: 1.05rem; }
  .language { padding-inline: 0.3rem; font-size: 0.86rem; }
}
@media (min-width: 1180px) { .head-nav { display: flex; } }

/* Abertura */
.hero { padding-block: clamp(2.5rem, 6vw, 4.75rem) clamp(3rem, 6vw, 5rem); }
.hero-grid { display: grid; gap: 1.5rem; }
.hero-side { display: grid; gap: 1.35rem; align-content: end; }
.lead { font-size: 1.16rem; }
@media (min-width: 960px) {
  .hero-grid { grid-template-columns: minmax(0, 1.5fr) minmax(0, 1fr); gap: 3.5rem; align-items: end; }
}

/* A mesa-07: a fala da colega à esquerda, o terminal à direita. O painel tem a borda e a
 * sombra dos painéis do app; as cores da conversa são as do Laboratório. */
.station {
  --area: var(--lab-blue);
  margin-top: clamp(2.25rem, 5vw, 3.5rem);
  border: 2px solid var(--rule); border-radius: 18px; overflow: hidden;
  background: var(--surface);
  box-shadow: 0 5px 0 var(--floor);
}
.station-bar {
  display: flex; align-items: center; justify-content: space-between; gap: 1rem;
  padding: 0.55rem 1.1rem; border-bottom: 1px solid var(--rule);
  background: var(--surface-2); color: var(--text-muted); font-size: 0.9rem;
}
.station-name { display: inline-flex; align-items: center; gap: 0.5rem; color: var(--text); font-family: var(--mono); }
.station-dot { width: 0.55rem; height: 0.55rem; border-radius: 50%; background: var(--area); }
.station-body { display: grid; }
@media (min-width: 880px) { .station-body { grid-template-columns: minmax(0, 5fr) minmax(0, 7fr); } }
.station-chat { display: grid; align-content: start; gap: 1.1rem; padding: clamp(1.2rem, 3vw, 1.9rem); }
.person { display: flex; align-items: center; gap: 0.85rem; }
.person strong { display: block; font-stretch: 90%; font-size: 1.05rem; }
.person small { display: block; color: var(--text-muted); font-size: 0.9rem; }
.portrait {
  display: block; flex: none; width: 56px; height: 56px; border-radius: 50%;
  background: var(--surface-2) url("../assets/landing/ponto-norte-equipe.jpg") no-repeat;
  background-size: 400% auto;
}
.portrait[data-person="helena"] { background-position: 0% 11%; }
.portrait[data-person="marina"] { background-position: 33.3333% 11%; }
.portrait[data-person="caio"] { background-position: 66.6667% 11%; }
.portrait[data-person="bia"] { background-position: 100% 11%; }
.portrait[data-person="rafael"] { background-position: 0% 78%; }
.portrait[data-person="luiza"] { background-position: 33.3333% 78%; }
.portrait[data-person="andre"] { background-position: 66.6667% 78%; }
.portrait[data-person="nando"] { background-position: 100% 78%; }
.message { font-size: 1.12rem; line-height: 1.55; }
.chat-actions { display: flex; flex-wrap: wrap; gap: 0.5rem; }
.chip {
  min-height: 40px; padding: 0.4rem 0.95rem;
  border: 1px solid var(--rule); border-radius: 10px; background: var(--bg); color: var(--text);
  font: inherit; font-size: 0.93rem; cursor: pointer;
}
.chip:hover { border-color: var(--area); }
.chip[aria-pressed="true"] { border-color: var(--area); background: var(--surface-2); color: var(--text); }
.chip[hidden], .reply[hidden], .language-note[hidden] { display: none; }
.language-note { color: var(--text-muted); font-size: 0.9rem; }
.reply { display: grid; justify-items: start; gap: 0.9rem; padding-left: 1rem; border-left: 3px solid var(--area); }
.reply:not([hidden]) { animation: arrive 0.24s ease-out; }
@keyframes arrive { from { opacity: 0; transform: translateY(6px); } }

.terminal {
  display: grid; grid-template-rows: 1fr auto auto; min-height: 280px;
  border-top: 1px solid var(--rule);
  background: var(--term-bg); color: var(--term-text); font: 0.95rem/1.55 var(--mono);
}
@media (min-width: 880px) { .terminal { border-top: 0; border-left: 1px solid var(--rule); } }
.terminal-log { max-height: 360px; overflow-y: auto; padding: 1.15rem 1.25rem 0.25rem; }
.terminal-hint { margin: 0 0 0.9rem; max-width: none; color: var(--term-dim); font: 0.93rem/1.5 "Ubuntu Sans", system-ui, sans-serif; }
.entry { margin-bottom: 0.75rem; }
.entry-command { margin: 0; max-width: none; overflow-wrap: anywhere; }
.entry-output {
  margin: 0.2rem 0 0; color: var(--term-muted);
  font: inherit; white-space: pre-wrap; overflow-wrap: anywhere;
}
.entry-output.is-error { color: var(--term-error); }
.prompt { color: var(--term-prompt); white-space: nowrap; }
.terminal-line {
  display: flex; flex-wrap: wrap; align-items: center; gap: 0.35rem 0.6rem;
  margin: 0 1.25rem; padding: 0.5rem 0 0.6rem;
  border-bottom: 2px solid var(--term-line);
}
.terminal-line:focus-within { border-bottom-color: var(--term-prompt); }
.terminal-line input {
  flex: 1 1 9rem; min-width: 0; padding: 0.35rem 0;
  border: 0; background: transparent; color: var(--term-text);
  font: inherit; caret-color: var(--term-prompt);
}
.terminal-line input::placeholder { color: var(--term-dim); }
.terminal-line input:focus-visible { outline: none; }
.terminal :focus-visible { outline-color: var(--term-prompt); }
.run {
  min-height: 38px; padding: 0.35rem 0.85rem;
  border: 1px solid var(--term-button-line); border-radius: 10px; background: var(--term-button); color: var(--term-text);
  font: 600 0.88rem/1 "Ubuntu Sans", system-ui, sans-serif; cursor: pointer;
}
.run:hover { border-color: #72856d; background: #334237; }
.terminal-status {
  min-height: 1.6rem; margin: 0; padding: 0.65rem 1.25rem 1rem; max-width: none;
  color: var(--term-prompt); font: 0.93rem/1.5 "Ubuntu Sans", system-ui, sans-serif;
}
.station:not(.is-ready) .chat-actions, .station:not(.is-ready) .terminal-line { display: none; }

/* Faixas: o fundo da página alterna com o fundo dos painéis. */
.band { padding-block: clamp(3.5rem, 8vw, 6.25rem); }
.band-surface { background: var(--surface); border-block: 1px solid var(--rule); }
.band-deep { background: var(--deep); border-top: 1px solid var(--rule); }
.band-rule { border-top: 1px solid var(--rule); }

/* Ponto Norte, com o azul do Laboratório */
#ponto-norte { --area: var(--lab-blue); }
.pn-grid { display: grid; gap: 2.5rem; }
.pn-copy { display: grid; gap: 1.15rem; justify-items: start; align-content: start; }
.pn-figure img { border: 1px solid var(--rule); border-radius: 12px; }
@media (min-width: 960px) { .pn-grid { grid-template-columns: minmax(0, 1fr) minmax(0, 1.08fr); gap: 4rem; } }
.team {
  display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 1.6rem 1rem;
  margin: clamp(2.75rem, 6vw, 4rem) 0 0; padding: 0; list-style: none;
}
.team li { display: grid; justify-items: start; gap: 0.1rem; }
.team .portrait { width: 76px; height: 76px; margin-bottom: 0.55rem; box-shadow: 0 0 0 2px var(--surface), 0 0 0 4px var(--rule); }
.team strong { font-stretch: 90%; font-size: 1.05rem; }
.team li > span:last-child { color: var(--text-muted); font-size: 0.92rem; line-height: 1.35; }
@media (min-width: 640px) { .team { grid-template-columns: repeat(4, minmax(0, 1fr)); } }
@media (min-width: 1100px) { .team { grid-template-columns: repeat(8, minmax(0, 1fr)); } }
.chapters-title { margin-top: clamp(2.75rem, 6vw, 4rem); }
.chapters { display: grid; margin: 1.1rem 0 0; padding: 0; list-style: none; }
.chapters li {
  display: grid; grid-template-columns: 2.6rem minmax(0, 1fr); column-gap: 0.9rem;
  padding: 0.95rem 0; border-top: 1px solid var(--rule);
}
.chapter-level {
  grid-row: span 2; color: var(--area);
  font-size: 2rem; font-stretch: 75%; font-weight: 760; line-height: 1;
}
.chapters strong { font-stretch: 92%; font-weight: 640; }
.chapters li > span:last-child { color: var(--text-muted); font-size: 0.95rem; }
@media (min-width: 760px) { .chapters { grid-template-columns: repeat(2, minmax(0, 1fr)); column-gap: 3rem; } }

/* Lições (céu) e quiz (sol) */
.study-lessons { --area: var(--sky); }
.study-quiz { --area: var(--sun); }
.study-grid { display: grid; gap: 3.25rem; margin-top: clamp(2rem, 5vw, 3rem); }
.study-block { display: grid; align-content: start; gap: 0.95rem; }
.lesson-frame { margin-bottom: 0.6rem; border: 1px solid var(--rule); border-radius: 12px; }
@media (min-width: 960px) { .study-grid { grid-template-columns: minmax(0, 1.12fr) minmax(0, 1fr); gap: 4.5rem; } }
.quiz-sample {
  display: grid; gap: 0.8rem; margin-bottom: 0.6rem; padding: 1.25rem 1.3rem;
  border: 2px solid var(--rule); border-radius: 16px; background: var(--surface);
  box-shadow: 0 5px 0 var(--floor);
}
.quiz-topic { color: var(--area); font-size: 0.92rem; }
.quiz-prompt { font-size: 1.2rem; font-stretch: 92%; font-weight: 620; line-height: 1.35; }
.quiz-prompt code { padding: 0.05rem 0.35rem; border-radius: 4px; background: var(--surface-2); }
.quiz-options { display: grid; gap: 0.45rem; margin: 0; padding: 0; list-style: none; }
.quiz-options li { padding: 0.6rem 0.85rem; border: 1px solid var(--rule); border-radius: 10px; font-size: 0.98rem; line-height: 1.4; }
.quiz-options li.is-right { border: 2px solid var(--accent); background: color-mix(in srgb, var(--accent) 12%, var(--surface)); }
.right-badge { margin-left: 0.35rem; color: var(--accent); font-size: 0.85rem; font-weight: 700; }
.quiz-explanation { padding-left: 0.85rem; border-left: 3px solid var(--area); color: var(--text-muted); font-size: 0.96rem; }

.levels { display: grid; gap: 2rem; margin-top: clamp(3.5rem, 7vw, 5rem); }
.levels-copy { display: grid; gap: 0.8rem; }
.level-list {
  display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 1.75rem 1.25rem;
  margin: 0; padding: 0; list-style: none;
}
@media (min-width: 600px) { .level-list { grid-template-columns: repeat(3, minmax(0, 1fr)); } }
@media (min-width: 960px) { .level-list { grid-template-columns: repeat(5, minmax(0, 1fr)); } }
.level-list li { display: grid; justify-items: start; align-content: start; gap: 0.1rem; }
.level-list img { width: 60px; height: 60px; margin-bottom: 0.55rem; }
.level-number { color: var(--text-muted); font-size: 0.9rem; }
.level-list strong { font-stretch: 90%; font-size: 1.1rem; }
.mascot-name { color: var(--text-muted); font-size: 0.93rem; }
/* Etiquetas como as do app: fundo e borda tingidos com a cor do texto. */
.tag {
  --tag: var(--accent);
  margin-top: 0.45rem; padding: 0.1rem 0.55rem;
  border: 1px solid color-mix(in srgb, var(--tag) 45%, var(--rule)); border-radius: 7px;
  background: color-mix(in srgb, var(--tag) 6%, transparent); color: var(--tag);
  font-size: 0.82rem; font-weight: 650;
}
.tag-premium { --tag: var(--gold); }
@media (min-width: 960px) { .levels { grid-template-columns: minmax(0, 0.8fr) minmax(0, 1.6fr); gap: 4rem; align-items: start; } }
.extras {
  display: grid; gap: 0.9rem; margin: clamp(3rem, 6vw, 4rem) 0 0; padding: 1.5rem 0 0;
  border-top: 1px solid var(--rule); list-style: none;
}
.extras a { font-weight: 650; }
@media (min-width: 900px) { .extras { grid-template-columns: 1fr 1fr; gap: 3rem; } }

/* Cibersegurança */
.sec-grid { display: grid; gap: 2.75rem; }
.sec-copy { display: grid; gap: 1.1rem; justify-items: start; align-content: start; }
.distros { display: grid; margin: 1rem 0 0; }
.distros div {
  display: grid; grid-template-columns: minmax(7.5rem, 9.5rem) minmax(0, 1fr); gap: 1rem;
  padding: 0.85rem 0; border-top: 1px solid var(--rule);
}
.distros dt { font-stretch: 92%; font-weight: 650; }
.distros dd { margin: 0; color: var(--text-muted); }
@media (min-width: 960px) { .sec-grid { grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 4.5rem; } }

/* Planos */
/* position: relative mantém os textos de leitor de tela dentro da rolagem da tabela no celular. */
.table-wrap { position: relative; margin-top: 2.25rem; overflow-x: auto; }
.plans { width: 100%; border-collapse: collapse; }
.plans th, .plans td { padding: 0.9rem 0.8rem; border-bottom: 1px solid var(--rule); text-align: left; vertical-align: middle; }
.plans thead th { border-bottom: 2px solid var(--accent); font-stretch: 90%; font-weight: 660; font-size: 1.02rem; }
.plans thead th:last-child { box-shadow: inset 0 -4px 0 var(--gold); }
.plans tbody th { font-weight: 450; text-wrap: pretty; }
.plans td, .plans thead th + th { width: 24%; text-align: center; }
@media (max-width: 599px) {
  .plans th, .plans td { padding-inline: 0.5rem; }
  .plans td, .plans thead th + th { width: 21%; }
}
.mark { position: relative; display: inline-block; width: 1.25rem; height: 1.25rem; vertical-align: middle; }
.mark-yes::after {
  content: ""; position: absolute; left: 0.42rem; top: 0.08rem; width: 0.38rem; height: 0.78rem;
  border: solid var(--accent); border-width: 0 0.2rem 0.2rem 0; transform: rotate(45deg);
}
.mark-no::after { content: ""; position: absolute; left: 0.3rem; right: 0.3rem; top: calc(50% - 1px); height: 2px; background: var(--mark-no); }
.premium-ways { --area: var(--gold); display: grid; gap: 0.85rem; justify-items: start; margin-top: 2.5rem; }

/* Turmas, com o coral da comunidade */
#turmas { --area: var(--coral); }
.class-grid { display: grid; gap: 1.5rem; }
.class-copy { display: grid; gap: 1.1rem; justify-items: start; }
@media (min-width: 960px) { .class-grid { grid-template-columns: minmax(0, 1fr) minmax(0, 1.4fr); gap: 4rem; } }

/* Fechamento */
.closing { padding-block: clamp(3rem, 6vw, 4.5rem); background: var(--surface); border-top: 1px solid var(--rule); }
.closing-row { display: grid; gap: 1.5rem; }
@media (min-width: 960px) { .closing-row { grid-template-columns: minmax(0, 1fr) auto; align-items: center; gap: 3rem; } }

/* Sobre o projeto */
.project-grid { display: grid; gap: 2.5rem; }
.project-copy { display: grid; gap: 1.05rem; }
.project-copy p { color: var(--text-muted); }
.project-copy .project-lead { color: var(--text); font-size: 1.14rem; }
.project-links { display: grid; gap: 0.7rem; align-content: start; margin: 0; padding: 0; list-style: none; }
@media (min-width: 960px) { .project-grid { grid-template-columns: minmax(0, 1.6fr) minmax(0, 1fr); gap: 4.5rem; } }

/* Rodapé */
.site-foot { padding-block: 1.6rem; border-top: 1px solid var(--rule); background: var(--deep); color: var(--text-muted); }
.site-foot .brand { color: var(--text); }
.foot-row { display: flex; flex-wrap: wrap; align-items: center; gap: 0.9rem 2rem; }
.foot-row p { margin-right: auto; font-size: 0.95rem; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .reply:not([hidden]) { animation: none; }
}