/* ==========================================================================
   landing-starter - styles.css

   Um design system de UMA página. Sem framework, sem build.
   Ordem de leitura: tokens -> base -> nav -> hero -> seções -> cards ->
   download -> faq -> footer -> breakpoints.

   Os três padrões que dão o caráter (e que valem entender antes de editar):
   1. Hairlines em vez de sombras: profundidade por fio de 1px.
   2. Grid como fio: cards com gap de 1px sobre fundo --hairline.
   3. Nav subtrativa: cada breakpoint esconde o que não é essencial.

   Comentário do autor: os nomes de token são PAPEL, não matiz.
   Trocar o valor troca o tema; trocar o papel quebra a hierarquia.
   ========================================================================== */

/* --------------------------------------------------------------------------
   1. TOKENS
   Troque aqui primeiro. O tema claro vive no :root; o escuro sobrescreve
   os mesmos papeis na classe .dark do <html>.
   -------------------------------------------------------------------------- */

:root {
  /* Cor de marca. Ajuste o tom para o tema escuro se necessário. */
  --accent: #7c3aed;
  --accent-hover: color-mix(in srgb, var(--accent) 84%, #000);
  --accent-soft: color-mix(in srgb, var(--accent) 10%, transparent);
  --accent-ring: color-mix(in srgb, var(--accent) 55%, transparent);
  --on-accent: #fff;

  /* Escada de superfície: canvas (página) -> band (faixa) -> surface (card) */
  --canvas: #fff;
  --band: #f7f8fa;
  --surface: #fff;
  --surface-2: #f1f3f6;

  /* Tinta: ink (texto forte) -> muted (corpo) -> faint (micro) */
  --ink: #13161c;
  --muted: #555c66;
  --faint: #848b96;

  /* Fios */
  --hairline: #e5e8ed;
  --hairline-strong: #d3d8e0;

  /* Ilustrações isométricas: três tons de face (topo, direita, esquerda) */
  --iso-top: #fafbfd;
  --iso-right: #eef1f6;
  --iso-left: #e2e7ef;

  /* Raios: um conjunto fechado, cada componente pega um degrau */
  --r-xs: 4px;
  --r-sm: 6px;
  --r-md: 8px;
  --r-lg: 12px;
  --r-xl: 14px;
  --r-pill: 9999px;

  /* Layout */
  --maxw: 1160px;
  --nav-h: 56px;

  /* Tipografia.
     Default sem dependência externa. Para usar uma fonte própria,
     coloque os .woff2 em assets/fonts/ e declare @font-face aqui. */
  --font-sans: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono: ui-monospace, "SF Mono", "Cascadinha Mono", Menlo, Consolas, monospace;
}

.dark {
  --accent: color-mix(in srgb, #7c3aed 78%, #fff);
  --accent-hover: color-mix(in srgb, #7c3aed 88%, #fff);
  --accent-soft: color-mix(in srgb, var(--accent) 14%, transparent);
  --accent-ring: color-mix(in srgb, var(--accent) 60%, transparent);
  --on-accent: #071021;

  --canvas: #07080b;
  --band: #0a0c10;
  --surface: #0f1117;
  --surface-2: #141721;

  --ink: #f2f4f8;
  --muted: #8e95a2;
  --faint: #626976;

  --hairline: #1e222c;
  --hairline-strong: #2c3140;

  /* Ilustrações isométricas no escuro */
  --iso-top: #1a1e28;
  --iso-right: #12151c;
  --iso-left: #0c0e14;
}

/* --------------------------------------------------------------------------
   2. BASE
   -------------------------------------------------------------------------- */

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--canvas);
  color: var(--ink);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.55;
  letter-spacing: -0.006em;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: clip;
}

a { color: inherit; text-decoration: none; }
img, svg { display: block; }
h1, h2, h3, h4, p, figure { margin: 0; }

::selection { background: color-mix(in srgb, var(--accent) 25%, transparent); }

/* Âncoras: o offset é a altura da nav fixa + folga */
[id] { scroll-margin-top: calc(var(--nav-h) + 16px); }

.mono { font-family: var(--font-mono); font-variant-numeric: tabular-nums; letter-spacing: 0; }

.wrap { max-width: var(--maxw); margin: 0 auto; padding: 0 32px; }

/* --------------------------------------------------------------------------
   3. NAV
   Fixed com blur. A classe .scrolled (via app.js) acende a borda inferior.
   A responsividade é SUBTRATIVA: em cada breakpoint some uma peça,
   nunca entra um hamburger. O que fica sempre: brand + CTA.
   -------------------------------------------------------------------------- */

.nav {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 100;
  background: color-mix(in srgb, var(--canvas) 78%, transparent);
  -webkit-backdrop-filter: saturate(160%) blur(16px);
  backdrop-filter: saturate(160%) blur(16px);
  border-bottom: 1px solid transparent;
  transition: border-color .2s, background .2s;
}
.nav.scrolled { border-bottom-color: var(--hairline); }

.nav-inner {
  height: var(--nav-h);
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 32px;
  display: flex;
  align-items: center;
  gap: 22px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 9px;
  font-size: 16px;
  font-weight: 600;
  letter-spacing: -0.015em;
  white-space: nowrap;
  flex: none;
}
.brand-mark {
  width: 22px; height: 22px;
  border-radius: 22%;
  background: var(--accent);
  flex: none;
}

.nav-links { display: flex; gap: 2px; margin-left: 8px; }
.nav-links a, .nav-gh {
  padding: 6px 11px;
  border-radius: var(--r-sm);
  color: var(--muted);
  font-size: 14px;
  font-weight: 450;
  white-space: nowrap;
  transition: color .15s, background .15s;
}
.nav-links a:hover, .nav-gh:hover { color: var(--ink); }

.nav-right { margin-left: auto; display: flex; align-items: center; gap: 6px; flex: none; }

.nav-gh { display: inline-flex; align-items: center; justify-content: center; }

.icon-btn {
  width: 34px; height: 34px;
  display: inline-flex; align-items: center; justify-content: center;
  border: none; background: transparent;
  border-radius: var(--r-md);
  color: var(--muted);
  cursor: pointer;
  transition: color .15s, background .15s;
}
.icon-btn:hover { color: var(--ink); background: color-mix(in srgb, var(--ink) 7%, transparent); }

/* O ícone troca com o tema: sol no escuro, lua no claro */
.dark .icon-moon { display: none; }
.icon-sun { display: none; }
.dark .icon-sun { display: inline; }

.nav .btn-primary { padding: 7px 14px; font-size: 14px; }

/* --------------------------------------------------------------------------
   4. BOTÕES
   -------------------------------------------------------------------------- */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 18px;
  border: 1px solid transparent;
  border-radius: var(--r-md);
  font-family: inherit;
  font-size: 15px;
  font-weight: 500;
  letter-spacing: -0.006em;
  white-space: nowrap;
  cursor: pointer;
  transition: transform .15s, background .15s, border-color .15s, color .15s;
}
.btn:active { transform: scale(.97); }
.btn:focus-visible { outline: 2px solid var(--accent-ring); outline-offset: 2px; }

.btn-primary { background: var(--accent); color: var(--on-accent); }
.btn-primary:hover { background: var(--accent-hover); }

/* --------------------------------------------------------------------------
   5. HERO
   A grade decorativa é desenhada com dois gradientes repetidos + máscara
   radial: zero elementos extra, zero JS. Fica atrás do conteúdo
   (pointer-events: none) e some no tema escuro? Não - ela acompanha o tema
   pelo token --hairline.
   -------------------------------------------------------------------------- */

.hero {
  position: relative;
  text-align: center;
  padding: calc(var(--nav-h) + 92px) 0 96px;
}

.hero-grid {
  position: absolute;
  inset: 0 0 auto 0;
  height: 448px;
  overflow: hidden;
  pointer-events: none;
  background-image:
    linear-gradient(to right, var(--hairline) 1px, transparent 1px),
    linear-gradient(to bottom, var(--hairline) 1px, transparent 1px);
  background-size: 56px 56px;
  background-position: center top;
  -webkit-mask-image: radial-gradient(120% 100% at 50% 0, #000d 0%, #0008 45%, transparent 85%);
  mask-image: radial-gradient(120% 100% at 50% 0, #000d 0%, #0008 45%, transparent 85%);
}

.hero-inner { position: relative; z-index: 1; }

.hero-spec {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  font-size: 12.5px;
  letter-spacing: .03em;
  color: var(--muted);
}
.hero-spec b { color: var(--ink); font-weight: 500; }
.hero-spec .sep { color: var(--faint); }

.hero h1 {
  margin: 22px 0 0;
  font-size: clamp(42px, 6.2vw, 72px);
  font-weight: 600;
  letter-spacing: -0.03em;
  line-height: 1.06;
  text-wrap: balance;
}
.accent-word { color: var(--accent); }

.hero .lede {
  margin: 22px auto 0;
  max-width: 52ch;
  font-size: clamp(17px, 2.2vw, 20px);
  color: var(--muted);
  text-wrap: pretty;
}
.hero .lede b { color: var(--ink); font-weight: 600; }

.cta-row {
  margin-top: 34px;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  align-items: center;
  gap: 12px;
}

/* Comando copiável: mono, com botão de copiar que vira .done no sucesso */
.brew {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 7px 7px 7px 14px;
  border: 1px solid var(--hairline-strong);
  border-radius: var(--r-md);
  background: var(--surface-2);
  font-family: var(--font-mono);
  font-size: 13.5px;
  color: var(--ink);
}
.brew .sigil { color: var(--accent); }
.copy-btn {
  width: 30px; height: 30px;
  display: inline-flex; align-items: center; justify-content: center;
  border: 1px solid var(--hairline);
  border-radius: var(--r-sm);
  background: var(--surface);
  color: var(--muted);
  cursor: pointer;
  transition: color .15s, background .15s, border-color .15s;
}
.copy-btn:hover { color: var(--ink); background: var(--surface-2); }
.copy-btn.done { color: var(--accent); border-color: var(--accent); }
.copy-btn svg { width: 15px; height: 15px; }

.hero-foot {
  margin-top: 26px;
  color: var(--faint);
  font-size: 13px;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  align-items: center;
  gap: 8px 22px;
}
.foot-os-row { display: inline-flex; align-items: center; gap: 14px; }
.foot-os {
  position: relative;
  cursor: default;
}
.foot-os .foot-tip {
  position: absolute;
  bottom: calc(100% + 9px);
  left: 50%;
  transform: translateX(-50%);
  padding: 5px 9px;
  border: 1px solid var(--hairline-strong);
  border-radius: var(--r-sm);
  background: var(--surface-2);
  color: var(--muted);
  font-size: 12px;
  white-space: nowrap;
  opacity: 0;
  pointer-events: none;
  transition: opacity .15s;
}
.foot-os:hover .foot-tip,
.foot-os:focus-visible .foot-tip { opacity: 1; }
.foot-lic { font-size: 12.5px; }

/* --------------------------------------------------------------------------
   6. SEÇÕES
   -------------------------------------------------------------------------- */

.section { padding: 96px 0; position: relative; }

/* A junção horizontal entre seções. Em telas largas (>=1024px) ganha
   marcadores "+" desenhados em mono nos dois cantos - o "desenho de planta". */
.rule { border-top: 1px solid var(--hairline); }
@media (min-width: 1024px) {
  .rule::before, .rule::after {
    content: "+";
    position: absolute;
    top: 0;
    font-family: var(--font-mono);
    font-size: 13px;
    line-height: 0;
    color: var(--hairline-strong);
    transform: translateY(-0.5px);
    pointer-events: none;
    user-select: none;
  }
  .rule::before { left: 0; transform: translate(-50%, -0.5px); }
  .rule::after { right: 0; transform: translate(50%, -0.5px); }
}

.section-head {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  gap: 32px;
  margin-bottom: 56px;
}
.section-head-copy { max-width: 640px; }
.section-head h2 {
  margin: 0 0 14px;
  font-size: clamp(28px, 3.6vw, 40px);
  font-weight: 600;
  letter-spacing: -0.025em;
  line-height: 1.12;
  text-wrap: balance;
}
.section-head p { color: var(--muted); font-size: clamp(16px, 1.8vw, 18px); text-wrap: pretty; }

/* Spec no canto da seção: mono, micro, caixa alta opcional */
.spec-line {
  flex: none;
  padding-bottom: 6px;
  font-size: 12px;
  letter-spacing: .04em;
  color: var(--faint);
  white-space: nowrap;
}

/* --------------------------------------------------------------------------
   7. CARDS - o "grid como fio": gap de 1px sobre fundo hairline.
   -------------------------------------------------------------------------- */

.card-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  background: var(--hairline);
  border: 1px solid var(--hairline);
  border-radius: var(--r-lg);
  overflow: hidden;
}

.card { display: flex; flex-direction: column; background: var(--canvas); transition: background .15s; }
.card:hover { background: var(--band); }

.card-well {
  padding: 18px;
  border-bottom: 1px solid var(--hairline);
  background-color: color-mix(in srgb, var(--band) 72%, var(--canvas));
  overflow: hidden;
}
.card-well svg { height: 178px; width: auto; max-width: 100%; margin: 0 auto; display: block; }

/* Ilustrações isométricas dos cards (kernel do iso-figure: cada face é um
   rect em coordenadas locais colocado no plano por matrix(), projeção 30
   graus; a oclusão é ordem de pintura, e o non-scaling-stroke mantém a
   hairline de 1px sob o transform). */
.card-well .iso-face {
  fill: var(--iso-right);
  stroke: var(--hairline-strong);
  stroke-width: 1;
  vector-effect: non-scaling-stroke;
  stroke-linejoin: round;
}
.card-well .iso-face.f-top { fill: var(--iso-top); }
.card-well .iso-face.f-left { fill: var(--iso-left); }
.card-well .iso-mark {
  fill: none;
  stroke: var(--hairline-strong);
  stroke-width: 1;
  vector-effect: non-scaling-stroke;
}
.card-well .iso-tick { fill: var(--hairline-strong); }
.card-well .iso-live {
  fill: none;
  stroke: var(--accent);
  stroke-width: 1.25;
  vector-effect: non-scaling-stroke;
}
.card-well .iso-live-fill { fill: var(--accent); }
.card-well .iso-label { fill: var(--accent); font-family: var(--font-mono); letter-spacing: .04em; }

/* Interação (hover no card). A própria geometria iso dita o movimento:
   z puro projeta vertical, então o "explode" da pilha é translateY; o pulso
   viaja pelo arco via offset-path; o selo sobe. */
.card-well .iso-plate,
.card-well .iso-float { transition: transform .28s cubic-bezier(.2, .7, .2, 1); }
.card:hover .iso-plate { transform: translateY(calc(var(--lift, 6px) * -1)); }
.card:hover .iso-float { transform: translateY(-7px); }
.card-well .iso-pulse { offset-distance: 50%; }
.card:hover .iso-pulse { animation: iso-travel 1.5s linear infinite; }
@keyframes iso-travel {
  from { offset-distance: 0%; }
  to { offset-distance: 100%; }
}
@media (prefers-reduced-motion: reduce) {
  .card-well .iso-plate,
  .card-well .iso-float { transition: none; }
  .card:hover .iso-plate,
  .card:hover .iso-float { transform: none; }
  .card:hover .iso-pulse { animation: none; }
}

.card-body { padding: 20px 26px 26px; }
.card h3 { font-size: 17px; font-weight: 600; letter-spacing: -0.015em; margin-bottom: 8px; }
.card p { color: var(--muted); font-size: 14.5px; text-wrap: pretty; }

/* --------------------------------------------------------------------------
   8. DOWNLOAD - os cards de OS. Os botões resolvem o último release no
   cliente (assets/js/latest-release.mjs, Nível 1.5 - ver download/README.md).
   -------------------------------------------------------------------------- */

.install-card {
  display: flex;
  flex-direction: column;
  padding: 26px 24px;
  background: var(--canvas);
}
.install-os { display: flex; align-items: center; gap: 10px; margin-bottom: 14px; }
.os-mark { width: 20px; height: 20px; color: var(--ink); flex: none; }
.install-card h3 { font-size: 17px; font-weight: 600; letter-spacing: -0.015em; }
.install-card p { margin: 6px 0 18px; color: var(--muted); font-size: 14.5px; text-wrap: pretty; }
/* o botão fica ancorado no fundo do card: os três alinham entre si mesmo
   se a descrição ocupar mais linhas em uma largura intermediaria */
.install-dl { align-self: flex-start; margin-top: auto; }

.install-note {
  margin-top: 20px;
  font-size: 12.5px;
  color: var(--faint);
  text-align: center;
}
.install-note code {
  font-family: var(--font-mono);
  font-size: 12px;
  padding: 2px 6px;
  border-radius: var(--r-xs);
  background: color-mix(in srgb, var(--ink) 6%, transparent);
  color: var(--ink);
}

/* --------------------------------------------------------------------------
   9. FAQ - <details> nativo. Zero JS.
   -------------------------------------------------------------------------- */

.faq-grid { display: grid; grid-template-columns: .8fr 1.2fr; gap: 64px; align-items: start; }
.faq-head h2 {
  margin: 0 0 16px;
  font-size: clamp(28px, 3.6vw, 40px);
  font-weight: 600;
  letter-spacing: -0.025em;
  line-height: 1.12;
  text-wrap: balance;
}
.faq-head p { color: var(--muted); font-size: 15px; max-width: 34ch; text-wrap: pretty; }
.faq-head a { color: var(--accent); }
.faq-head a:hover { text-decoration: underline; }

.faq-list { border-top: 1px solid var(--hairline); }
.faq-item { border-bottom: 1px solid var(--hairline); }
.faq-q {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  padding: 22px 4px;
  list-style: none;
  cursor: pointer;
  font-size: 17px;
  font-weight: 600;
  letter-spacing: -0.012em;
}
.faq-q::-webkit-details-marker { display: none; }
.faq-chev { color: var(--muted); transition: transform .2s; font-family: var(--font-mono); }
.faq-item[open] .faq-chev { transform: rotate(45deg); }
.faq-a { padding: 0 4px 24px; color: var(--muted); font-size: 15.5px; text-wrap: pretty; }

/* --------------------------------------------------------------------------
   10. FOOTER
   -------------------------------------------------------------------------- */

footer { border-top: 1px solid var(--hairline); padding: 72px 0 44px; }
.foot-grid { display: grid; grid-template-columns: 1.6fr 1fr 1fr 1fr; gap: 40px; }
.foot-brand p { margin-top: 14px; max-width: 300px; color: var(--muted); font-size: 14px; text-wrap: pretty; }
.foot-col h5 {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  font-weight: 500;
  letter-spacing: .07em;
  text-transform: uppercase;
  color: var(--faint);
}
.foot-col a { display: block; padding: 6px 0; color: var(--muted); font-size: 14.5px; transition: color .15s; }
.foot-col a:hover { color: var(--accent); }

.foot-bot {
  margin-top: 52px;
  padding-top: 24px;
  border-top: 1px solid var(--hairline);
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  font-size: 12px;
  color: var(--muted);
}

/* --------------------------------------------------------------------------
   11. BREAKPOINTS - a nav é subtrativa; o conteúdo só empilha.
   920 é o divisor: 680 ajusta densidade; 600 e 380 são a nav.
   -------------------------------------------------------------------------- */

@media (max-width: 920px) {
  /* nav: somem os links de seção */
  .nav-links { display: none; }

  /* conteúdo */
  .section-head { display: block; margin-bottom: 44px; }
  .spec-line { display: none; }
  .faq-grid { grid-template-columns: 1fr; gap: 36px; }
  .card-grid.card-grid-3 { grid-template-columns: 1fr; }
  .foot-grid { grid-template-columns: 1fr 1fr; gap: 28px; }
}

@media (max-width: 680px) {
  .section { padding: 72px 0; }
  .hero { padding-top: calc(var(--nav-h) + 72px); }
  .nav-inner { gap: 14px; padding: 0 20px; }
  .wrap { padding: 0 20px; }
  .card-grid { grid-template-columns: 1fr; }
  .foot-grid { grid-template-columns: 1fr; }
}

@media (max-width: 600px) {
  /* nav: some o link do GitHub */
  .nav-gh { display: none; }
}

@media (max-width: 380px) {
  /* nav: some o toggle de tema; sobra brand + CTA */
  .icon-btn { display: none; }
  .nav-inner { padding: 0 16px; }
  .wrap { padding: 0 16px; }
}

/* --------------------------------------------------------------------------
   12. MOVIMENTO REDUZIDO
   Quem pediu menos animação pediu menos animação em tudo.
   -------------------------------------------------------------------------- */

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .btn, .icon-btn, .copy-btn, .card, .faq-chev, .foot-os .foot-tip, .nav {
    transition: none;
  }
  .btn:active { transform: none; }
}