/* ==========================================================================
   HEXA · DESIGN SYSTEM & ROTEIRO CINEMATOGRÁFICO
   Contrato Canônico: _app-vault/specs/design-system.md (DEC-011 / DEC-017)
   Skill Reference: styles/landing/roteiro.md
   ========================================================================== */

:root {
  /* Camada 1: Base (Paleta da Marca) */
  --coal: #17140F;
  --panelDark: #211D15;
  --insetDark: #0D0B08;
  --bone: #F6F4EE;
  --ink: #201D17;
  --brass: #A3813C;
  --brassBright: #CFA955;
  --taupe: #A8A199;
  --taupeLight: #6E675C;

  /* Camada 2: Semânticos */
  --surface-base: var(--coal);
  --surface-raised: var(--panelDark);
  --surface-inset: var(--insetDark);
  --fg-primary: var(--bone);
  --fg-secondary: rgba(246, 244, 238, 0.68);
  --fg-tertiary: rgba(246, 244, 238, 0.50);
  --hairline: rgba(246, 244, 238, 0.13);
  --hairline-gold: rgba(207, 169, 85, 0.28);
  --brand-accent: var(--brassBright);

  /* Tipografia Canônica */
  --serif: "Instrument Serif", Georgia, serif;
  --sans: "Manrope", -apple-system, BlinkMacSystemFont, "SF Pro Text", sans-serif;
  --mono: "IBM Plex Mono", SFMono-Regular, Menlo, monospace;

  /* Geometria */
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 14px;
}

/* Reset básico */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  background-color: var(--surface-base);
  color: var(--fg-primary);
}

body {
  font-family: var(--sans);
  background-color: var(--surface-base);
  color: var(--fg-primary);
  font-size: 15px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

body.hx-menu-open {
  overflow: hidden;
}

/* Âncoras compensam o header fixo de 64px */
section[id],
.rl-chapter {
  scroll-margin-top: 80px;
}

#top {
  scroll-margin-top: 0;
}

a:focus-visible,
button:focus-visible,
summary:focus-visible {
  outline: 2px solid var(--taupe);
  outline-offset: 2px;
}

[tabindex="-1"]:focus {
  outline: none;
}

/* Container de leitura */
.hx-container {
  max-width: 1140px;
  margin: 0 auto;
  padding: 0 24px;
}

/* Tipografia Comum */
.eyebrow {
  font-family: var(--mono);
  font-size: 10.5px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--brand-accent);
  display: block;
  margin-bottom: 8px;
}

.sec-label {
  display: flex;
  align-items: baseline;
  gap: 20px;
  margin-bottom: 48px;
  border-bottom: 1px solid var(--hairline);
  padding-bottom: 24px;
}

.sec-num {
  font-family: var(--serif);
  font-style: italic;
  font-size: 44px;
  color: var(--brand-accent);
  line-height: 1;
}

.sec-heading {
  font-family: var(--serif);
  font-size: clamp(32px, 4vw, 48px);
  font-weight: 400;
  letter-spacing: -0.015em;
  line-height: 1.15;
  color: var(--bone);
}

/* Ajustes de leitura para chinês simplificado */
html[lang="zh"] .hero-title {
  font-size: clamp(38px, 5vw, 58px);
  letter-spacing: 0;
  line-height: 1.2;
}

html[lang="zh"] .eyebrow,
html[lang="zh"] .chap-badge,
html[lang="zh"] .mod-tag,
html[lang="zh"] .install-tag,
html[lang="zh"] .side-label {
  letter-spacing: 0.06em;
}

/* ==========================================================================
   0. HEADER FIXO
   ========================================================================== */
.hx-header {
  position: sticky;
  top: 0;
  z-index: 999;
  background: rgba(23, 20, 15, 0.94);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--hairline);
  height: 64px;
  display: flex;
  align-items: center;
}

.hx-header-inner {
  max-width: 1140px;
  width: 100%;
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.hx-brand {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  color: var(--bone);
}

.hx-wordmark {
  font-family: var(--serif);
  font-size: 26px;
  letter-spacing: -0.02em;
  line-height: 1;
}

.hx-wordmark em {
  font-style: italic;
  color: var(--brand-accent);
}

.hx-nav {
  display: flex;
  align-items: center;
  gap: 24px;
}

.hx-nav-link {
  font-size: 13px;
  font-weight: 500;
  color: var(--fg-secondary);
  text-decoration: none;
  transition: color 0.15s;
}

.hx-nav-link:hover {
  color: var(--bone);
}

.hx-header-actions {
  display: flex;
  align-items: center;
  gap: 16px;
}

/* Seletor de idiomas: pílula PT · EN · ES · ZH */
.hx-lang {
  display: inline-flex;
  align-items: center;
  border: 1px solid var(--hairline);
  border-radius: var(--radius-sm);
  background: var(--surface-inset);
  padding: 2px;
}

.hx-lang-btn {
  appearance: none;
  border: 0;
  background: transparent;
  color: var(--fg-tertiary);
  font-family: var(--mono);
  font-size: 10px;
  font-weight: 500;
  letter-spacing: 0.08em;
  line-height: 1;
  padding: 6px 7px;
  border-radius: 4px;
  cursor: pointer;
  transition: color 0.15s ease, background-color 0.15s ease;
}

.hx-lang-btn + .hx-lang-btn {
  box-shadow: inset 1px 0 0 var(--hairline);
}

.hx-lang-btn:hover {
  color: var(--bone);
}

.hx-lang-btn.is-active {
  color: var(--brand-accent);
  background: rgba(207, 169, 85, 0.12);
}

.hx-lang-btn:focus-visible {
  outline: 2px solid var(--taupe);
  outline-offset: 1px;
}

/* Botão hambúrguer (visível no mobile) */
.hx-menu-toggle {
  display: none;
  width: 38px;
  height: 38px;
  align-items: center;
  justify-content: center;
  padding: 0;
  background: transparent;
  border: 1px solid var(--hairline);
  border-radius: var(--radius-sm);
  cursor: pointer;
}

.hx-menu-toggle:hover {
  border-color: var(--hairline-gold);
}

.hx-menu-toggle__bars {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 18px;
}

.hx-menu-toggle__bars span {
  display: block;
  width: 100%;
  height: 1.5px;
  background: var(--bone);
  border-radius: 1px;
  transition: transform 0.2s ease, opacity 0.2s ease;
}

.hx-menu-toggle[aria-expanded="true"] .hx-menu-toggle__bars span:nth-child(1) {
  transform: translateY(6.5px) rotate(45deg);
}

.hx-menu-toggle[aria-expanded="true"] .hx-menu-toggle__bars span:nth-child(2) {
  opacity: 0;
}

.hx-menu-toggle[aria-expanded="true"] .hx-menu-toggle__bars span:nth-child(3) {
  transform: translateY(-6.5px) rotate(-45deg);
}

/* Gaveta mobile */
.hx-mobile-backdrop {
  display: none;
  position: fixed;
  inset: 0;
  z-index: 900;
  background: rgba(13, 11, 8, 0.62);
  backdrop-filter: blur(3px);
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transition: opacity 0.24s ease, visibility 0s linear 0.24s;
}

.hx-mobile-backdrop.is-open {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
  transition-delay: 0s;
}

.hx-mobile-menu {
  display: none;
  position: fixed;
  top: 64px;
  right: 0;
  bottom: 0;
  z-index: 950;
  width: min(360px, calc(100vw - 40px));
  padding: 24px;
  flex-direction: column;
  gap: 24px;
  background: var(--panelDark);
  border-left: 1px solid var(--hairline);
  overflow-y: auto;
  visibility: hidden;
  opacity: 0;
  transform: translateX(16px);
  transition: transform 0.28s cubic-bezier(0.4, 0, 0.2, 1), opacity 0.2s ease,
    visibility 0s linear 0.28s;
}

.hx-mobile-menu.is-open {
  visibility: visible;
  opacity: 1;
  transform: translateX(0);
  transition-delay: 0s;
}

.hx-mobile-menu__head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--hairline);
}

.hx-mobile-menu__title {
  font-family: var(--mono);
  font-size: 10.5px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--taupe);
}

.hx-mobile-close {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  padding: 0;
  background: transparent;
  border: 1px solid var(--hairline);
  border-radius: var(--radius-sm);
  color: var(--bone);
  font-size: 18px;
  line-height: 1;
  cursor: pointer;
}

.hx-mobile-close:hover {
  background: rgba(246, 244, 238, 0.06);
}

.hx-mobile-nav {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.hx-mobile-link {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 10px;
  border-radius: var(--radius-sm);
  color: var(--fg-secondary);
  text-decoration: none;
  font-size: 15px;
  font-weight: 500;
  transition: background-color 0.15s ease, color 0.15s ease;
}

.hx-mobile-link__num {
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.1em;
  color: var(--fg-tertiary);
}

.hx-mobile-link:hover,
.hx-mobile-link:active {
  background: rgba(246, 244, 238, 0.05);
  color: var(--bone);
}

.hx-mobile-link:hover .hx-mobile-link__num {
  color: var(--brand-accent);
}

.hx-mobile-menu__foot {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-top: auto;
  padding-top: 20px;
  border-top: 1px solid var(--hairline);
}

.hx-lang-label {
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--fg-tertiary);
}

.hx-lang--menu {
  display: flex;
  width: 100%;
}

.hx-lang--menu .hx-lang-btn {
  flex: 1;
  padding: 8px 0;
}

.hx-mobile-cta {
  width: 100%;
  margin-top: 4px;
}

@media (max-width: 900px) {
  .hx-nav { display: none; }
  .hx-lang--header { display: none; }
  .hx-menu-toggle { display: inline-flex; }
  .hx-mobile-backdrop { display: block; }
  .hx-mobile-menu { display: flex; }
}

@media (max-width: 420px) {
  .hx-header-actions .hx-header-cta { display: none; }
}

/* Botões */
.btn-primary {
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  background: var(--bone);
  color: var(--ink);
  font-family: var(--sans);
  font-weight: 600;
  font-size: 13.5px;
  padding: 10px 22px;
  border-radius: var(--radius-sm);
  text-decoration: none;
  transition: all 0.15s ease;
  line-height: 1.25;
}

.btn-primary:hover {
  background: #ffffff;
  transform: translateY(-1px);
  box-shadow: 0 4px 16px rgba(246, 244, 238, 0.15);
}

.btn-primary .btn-sub {
  font-size: 10px;
  font-weight: 500;
  color: #555;
  font-family: var(--mono);
}

/* Estado de quem ainda não tem release para baixar: mantém a forma do botão
   sem prometer clique, já que não há arquivo para entregar. */
.btn-primary[aria-disabled="true"] {
  background: transparent;
  border: 1px dashed var(--hairline);
  color: var(--fg-tertiary);
  cursor: default;
}

.btn-primary[aria-disabled="true"]:hover {
  background: transparent;
  transform: none;
  box-shadow: none;
}

.btn-secondary {
  display: inline-flex;
  align-items: center;
  background: var(--surface-raised);
  border: 1px solid var(--hairline);
  color: var(--bone);
  font-family: var(--sans);
  font-weight: 600;
  font-size: 13.5px;
  padding: 12px 24px;
  border-radius: var(--radius-sm);
  text-decoration: none;
  transition: background 0.15s;
}

.btn-secondary:hover {
  background: rgba(246, 244, 238, 0.08);
}

.btn-terminal {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  background: var(--surface-inset);
  border: 1px solid var(--hairline);
  color: var(--fg-secondary);
  font-family: var(--mono);
  font-size: 12.5px;
  padding: 10px 18px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: border-color 0.15s;
}

.btn-terminal:hover {
  border-color: var(--hairline-gold);
}

.term-prompt {
  color: var(--brand-accent);
  font-weight: 600;
}

.copy-badge {
  font-size: 9.5px;
  letter-spacing: 0.12em;
  background: rgba(207, 169, 85, 0.15);
  color: var(--brand-accent);
  padding: 3px 6px;
  border-radius: 4px;
  font-weight: 600;
}

.copy-badge.is-copied {
  background: var(--brand-accent);
  color: var(--ink);
}

/* ==========================================================================
   1. HERO CINEMATOGRÁFICO
   ========================================================================== */
.hx-hero {
  padding: 64px 0 96px;
  border-bottom: 1px solid var(--hairline);
  position: relative;
}

.hx-slate {
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-bottom: 1px solid var(--hairline);
  padding-bottom: 16px;
  margin-bottom: 48px;
  font-family: var(--mono);
  font-size: 11px;
}

.slate-pill {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--brand-accent);
}

.slate-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--brand-accent);
  box-shadow: 0 0 8px var(--brand-accent);
}

.slate-status {
  color: var(--fg-tertiary);
}

.slate-status b {
  color: var(--bone);
  font-weight: 500;
}

.slate-status .divider {
  margin: 0 8px;
  color: var(--hairline);
}

.hero-content {
  text-align: center;
  max-width: 820px;
  margin: 0 auto 56px;
}

.hero-title {
  font-family: var(--serif);
  font-size: clamp(44px, 6vw, 70px);
  font-weight: 400;
  letter-spacing: -0.02em;
  line-height: 1.08;
  margin: 16px 0 24px;
  color: var(--bone);
}

.hero-title em {
  font-style: italic;
  color: var(--brand-accent);
}

.hero-lead {
  font-size: 17.5px;
  color: var(--fg-secondary);
  line-height: 1.6;
  margin-bottom: 36px;
}

.hero-actions {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
}

/* Hero Visual: Janela macOS Unificada (DEC-014) */
.hero-visual {
  margin-top: 56px;
}

.mockup-frame {
  background: var(--surface-raised);
  border: 1px solid var(--hairline);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: 0 24px 60px rgba(0, 0, 0, 0.5), 0 0 0 1px rgba(255, 255, 255, 0.03);
}

.mockup-bar {
  background: #1c1813;
  border-bottom: 1px solid var(--hairline);
  padding: 10px 16px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.traffic-dots {
  display: flex;
  gap: 6px;
}

.traffic-dots span {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: rgba(246, 244, 238, 0.2);
}

.traffic-dots span:nth-child(1) { background: #ff5f56; }
.traffic-dots span:nth-child(2) { background: #ffbd2e; }
.traffic-dots span:nth-child(3) { background: #27c93f; }

.mockup-title {
  font-family: var(--mono);
  font-size: 11px;
  color: var(--fg-tertiary);
}

.mockup-pill {
  font-family: var(--mono);
  font-size: 9.5px;
  letter-spacing: 0.1em;
  color: var(--brand-accent);
  background: rgba(207, 169, 85, 0.1);
  padding: 2px 8px;
  border-radius: 4px;
}

.mockup-body {
  display: grid;
  grid-template-columns: 240px 1fr;
  min-height: 320px;
}

@media (max-width: 768px) {
  .mockup-body { grid-template-columns: 1fr; }
  .mockup-sidebar { display: none; }
}

.mockup-sidebar {
  border-right: 1px solid var(--hairline);
  padding: 20px 16px;
  background: rgba(13, 11, 8, 0.4);
}

.side-label {
  font-family: var(--mono);
  font-size: 9.5px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--fg-tertiary);
  margin-bottom: 12px;
  padding-left: 8px;
}

.side-row {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 10px;
  border-radius: var(--radius-sm);
  font-size: 13px;
  color: var(--fg-secondary);
  margin-bottom: 2px;
}

.side-row.active {
  background: rgba(207, 169, 85, 0.12);
  color: var(--bone);
  font-weight: 600;
}

.side-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--fg-tertiary);
}

.side-row.active .side-dot {
  background: var(--brand-accent);
  box-shadow: 0 0 6px var(--brand-accent);
}

.mockup-content {
  padding: 28px;
  background: var(--surface-base);
}

.diag-header {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  border-bottom: 1px solid var(--hairline);
  padding-bottom: 18px;
  margin-bottom: 24px;
}

.diag-tag {
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.14em;
  color: var(--brand-accent);
  margin-bottom: 4px;
}

.diag-kpi {
  font-family: var(--sans);
  font-size: 18px;
  font-weight: 600;
  color: var(--bone);
}

.diag-rpm {
  display: flex;
  align-items: baseline;
  gap: 4px;
}

.rpm-val {
  font-family: var(--mono);
  font-size: 28px;
  font-weight: 600;
  color: var(--brand-accent);
  font-variant-numeric: tabular-nums;
}

.rpm-unit {
  font-family: var(--mono);
  font-size: 11px;
  color: var(--fg-tertiary);
}

.diag-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
}

.diag-card {
  background: var(--surface-raised);
  border: 1px solid var(--hairline);
  border-radius: var(--radius-sm);
  padding: 16px;
}

.diag-card .lbl {
  font-size: 12px;
  color: var(--fg-tertiary);
  margin-bottom: 4px;
}

.diag-card .val {
  font-family: var(--mono);
  font-size: 20px;
  font-weight: 600;
  color: var(--bone);
  margin-bottom: 4px;
}

.diag-card .sub-ok {
  font-size: 11px;
  color: var(--brand-accent);
  font-family: var(--mono);
}

/* ==========================================================================
   2. O PROBLEMA (FAN CARDS COM PERSPECTIVA 3D)
   ========================================================================== */
.hx-section {
  padding: 96px 0;
  border-bottom: 1px solid var(--hairline);
}

.fan-cards-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  perspective: 1200px;
}

@media (max-width: 860px) {
  .fan-cards-grid { grid-template-columns: 1fr; }
}

.fan-card {
  background: var(--surface-raised);
  border: 1px solid var(--hairline);
  border-radius: var(--radius-md);
  padding: 32px 28px;
  transform: rotate(var(--fan-rot, 0deg));
  transition: transform 0.3s ease, border-color 0.3s ease;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.fan-card:hover {
  transform: rotate(0deg) translateY(-4px);
  border-color: var(--hairline-gold);
}

.fan-card-num {
  font-family: var(--mono);
  font-size: 11px;
  color: var(--brand-accent);
  margin-bottom: 16px;
}

.fan-card-title {
  font-family: var(--sans);
  font-size: 19px;
  font-weight: 600;
  color: var(--bone);
  margin-bottom: 12px;
  line-height: 1.3;
}

.fan-card-desc {
  font-size: 14px;
  color: var(--fg-secondary);
  line-height: 1.6;
  margin-bottom: 24px;
}

.fan-card-fix {
  border-top: 1px dashed var(--hairline);
  padding-top: 14px;
  font-size: 12px;
  color: var(--brand-accent);
}

.fan-card-fix .fix-label {
  font-family: var(--mono);
  font-weight: 600;
  font-size: 10px;
  display: block;
  margin-bottom: 2px;
  color: var(--fg-tertiary);
}

/* ==========================================================================
   3. HORIZONTAL REEL CINEMATOGRÁFICO (ROTEIRO.MD)
   ========================================================================== */
.rl-how {
  position: relative;
  /* ~20% menos scroll na troca entre cards do que os 420vh anteriores */
  height: 355vh;
  background: var(--coal);
}

.rl-how__stage {
  position: sticky;
  top: 64px; /* Abaixo do header */
  height: calc(100vh - 64px);
  display: flex;
  flex-direction: column;
  overflow: hidden;
  border-bottom: 1px solid var(--hairline);
}

.rl-header {
  padding: 24px 32px;
  border-bottom: 1px solid var(--hairline);
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: rgba(23, 20, 15, 0.8);
  backdrop-filter: blur(12px);
  z-index: 10;
}

.rl-header-left {
  display: flex;
  align-items: baseline;
  gap: 16px;
}

.sec-num-small {
  font-family: var(--serif);
  font-style: italic;
  font-size: 28px;
  color: var(--brand-accent);
}

.rl-track-counter {
  font-family: var(--mono);
  font-size: 11px;
  color: var(--fg-tertiary);
}

.rl-track-counter span {
  color: var(--brand-accent);
  font-weight: 500;
}

.rl-body {
  flex: 1;
  display: grid;
  grid-template-columns: 80px 1fr;
  position: relative;
  overflow: hidden;
}

@media (max-width: 768px) {
  .rl-body { grid-template-columns: 60px 1fr; }
}

/* Rail Lateral de Capítulos */
.rl-rail {
  border-right: 1px solid var(--hairline);
  background: rgba(13, 11, 8, 0.6);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: space-around;
  padding: 40px 0;
  position: relative;
}

.rl-rail__line {
  position: absolute;
  top: 40px;
  bottom: 40px;
  width: 1px;
  background: var(--hairline);
  z-index: 1;
}

.rl-rail__fill {
  width: 100%;
  height: 0%;
  background: var(--brand-accent);
  box-shadow: 0 0 8px var(--brand-accent);
  transition: height 0.1s linear;
}

.rl-tick {
  background: transparent;
  border: none;
  cursor: pointer;
  z-index: 2;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  padding: 8px 4px;
}

.tick-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  border: 1.5px solid var(--hairline);
  background: var(--coal);
  transition: all 0.2s ease;
}

.rl-tick.active .tick-dot {
  border-color: var(--brand-accent);
  background: var(--brand-accent);
  box-shadow: 0 0 10px var(--brand-accent);
}

.tick-code {
  font-family: var(--mono);
  font-size: 9px;
  letter-spacing: 0.1em;
  color: var(--fg-tertiary);
}

.rl-tick.active .tick-code {
  color: var(--brand-accent);
  font-weight: 600;
}

/* Viewport do Reel Horizontal */
.rl-viewport {
  overflow: hidden;
  position: relative;
  display: flex;
  align-items: center;
}

.rl-track {
  display: flex;
  gap: 32px;
  padding: 0 48px;
  will-change: transform;
  transform: translate3d(0, 0, 0);
  transition: transform 0.05s linear;
}

.rl-chapter {
  flex: 0 0 540px;
  background: var(--surface-raised);
  border: 1px solid var(--hairline);
  border-radius: var(--radius-lg);
  padding: 48px 40px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  box-shadow: 0 16px 40px rgba(0, 0, 0, 0.4);
}

@media (max-width: 640px) {
  .rl-chapter { flex: 0 0 320px; padding: 28px 20px; }
}

.chap-badge {
  font-family: var(--mono);
  font-size: 10.5px;
  letter-spacing: 0.14em;
  color: var(--brand-accent);
  margin-bottom: 12px;
}

.chap-title {
  font-family: var(--serif);
  font-size: clamp(26px, 3.2vw, 36px);
  font-weight: 400;
  letter-spacing: -0.01em;
  line-height: 1.2;
  color: var(--bone);
  margin-bottom: 16px;
}

.chap-desc {
  font-size: 14.5px;
  color: var(--fg-secondary);
  line-height: 1.65;
  margin-bottom: 32px;
}

.chap-metrics {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  background: var(--surface-inset);
  border: 1px solid var(--hairline);
  border-radius: var(--radius-sm);
  padding: 16px;
}

@media (max-width: 640px) {
  .chap-metrics { grid-template-columns: 1fr; }
}

.metric-item .lbl {
  display: block;
  font-size: 10.5px;
  color: var(--fg-tertiary);
  margin-bottom: 2px;
}

.metric-item .val {
  display: block;
  font-family: var(--mono);
  font-size: 12px;
  color: var(--bone);
  font-weight: 500;
}

/* ==========================================================================
   4. OS MÓDULOS CANÔNICOS
   ========================================================================= */
.modules-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

@media (max-width: 900px) {
  .modules-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 600px) {
  .modules-grid { grid-template-columns: 1fr; }
}

.mod-card {
  background: var(--surface-raised);
  border: 1px solid var(--hairline);
  border-radius: var(--radius-md);
  padding: 24px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: all 0.2s ease;
}

.mod-card:hover {
  border-color: var(--hairline-gold);
  transform: translateY(-2px);
}

.mod-num {
  font-family: var(--serif);
  font-style: italic;
  font-size: 24px;
  color: var(--brand-accent);
  margin-bottom: 8px;
}

.mod-title {
  font-family: var(--sans);
  font-size: 16px;
  font-weight: 600;
  color: var(--bone);
  margin-bottom: 8px;
}

.mod-desc {
  font-size: 13px;
  color: var(--fg-secondary);
  line-height: 1.5;
  margin-bottom: 20px;
}

.mod-tag {
  font-family: var(--mono);
  font-size: 9.5px;
  letter-spacing: 0.12em;
  color: var(--fg-tertiary);
  background: var(--surface-inset);
  padding: 4px 8px;
  border-radius: 4px;
  align-self: flex-start;
}

/* ==========================================================================
   5. ARQUITETURA (OS 3 PILARES)
   ========================================================================= */
.arch-trio {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

@media (max-width: 860px) {
  .arch-trio { grid-template-columns: 1fr; }
}

.arch-box {
  background: var(--surface-raised);
  border: 1px solid var(--hairline);
  border-radius: var(--radius-md);
  padding: 36px 28px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.arch-icon {
  font-family: var(--serif);
  font-style: italic;
  font-size: 32px;
  color: var(--brand-accent);
  margin-bottom: 16px;
}

.arch-title {
  font-family: var(--serif);
  font-size: 26px;
  font-weight: 400;
  color: var(--bone);
  margin-bottom: 12px;
}

.arch-desc {
  font-size: 14px;
  color: var(--fg-secondary);
  line-height: 1.6;
  margin-bottom: 24px;
}

.arch-metric {
  font-family: var(--mono);
  font-size: 11.5px;
  color: var(--brand-accent);
  border-top: 1px dashed var(--hairline);
  padding-top: 14px;
}

/* ==========================================================================
   6. INSTALAÇÃO
   ========================================================================= */
.install-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

@media (max-width: 860px) {
  .install-grid { grid-template-columns: 1fr; }
}

.install-card {
  background: var(--surface-raised);
  border: 1px solid var(--hairline);
  border-radius: var(--radius-md);
  padding: 32px 24px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.install-card.highlight {
  border-color: var(--brand-accent);
  background: #252018;
}

.install-tag {
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.14em;
  color: var(--brand-accent);
  margin-bottom: 12px;
}

.install-title {
  font-family: var(--sans);
  font-size: 18px;
  font-weight: 600;
  color: var(--bone);
  margin-bottom: 10px;
}

.install-desc {
  font-size: 13.5px;
  color: var(--fg-secondary);
  line-height: 1.5;
  margin-bottom: 24px;
}

.terminal-snippet {
  background: var(--surface-inset);
  border: 1px solid var(--hairline);
  padding: 12px 14px;
  border-radius: var(--radius-sm);
  font-family: var(--mono);
  font-size: 12px;
  color: var(--bone);
}

.terminal-snippet span {
  color: var(--brand-accent);
  margin-right: 6px;
}

.install-foot {
  font-family: var(--mono);
  font-size: 11px;
  color: var(--fg-tertiary);
  /* Encosta no rodapé do card: como os três têm alturas de texto diferentes,
     só assim a linha de requisitos fica alinhada entre eles. */
  margin-top: auto;
  padding-top: 20px;
}

/* ==========================================================================
   7. FAQ ACORDEÃO
   ========================================================================= */
.faq-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.faq-item {
  background: var(--surface-raised);
  border: 1px solid var(--hairline);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: border-color 0.15s;
}

.faq-item[open] {
  border-color: var(--hairline-gold);
}

.faq-summary {
  padding: 22px 24px;
  font-size: 16px;
  font-weight: 600;
  color: var(--bone);
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  list-style: none;
}

.faq-summary::-webkit-details-marker {
  display: none;
}

.faq-chevron {
  font-family: var(--mono);
  color: var(--brand-accent);
  transition: transform 0.2s ease;
}

.faq-item[open] .faq-chevron {
  transform: rotate(180deg);
}

.faq-answer {
  padding: 0 24px 22px;
  font-size: 14.5px;
  color: var(--fg-secondary);
  line-height: 1.6;
}

/* ==========================================================================
   8. FOOTER & FINAL CTA
   ========================================================================= */
.hx-footer {
  padding: 96px 0 48px;
  background: var(--insetDark);
  border-top: 1px solid var(--hairline);
}

.cta-banner {
  background: var(--surface-raised);
  border: 1px solid var(--hairline);
  border-radius: var(--radius-lg);
  padding: 64px 40px;
  text-align: center;
  margin-bottom: 72px;
}

.cta-banner-content {
  max-width: 680px;
  margin: 0 auto;
}

.cta-title {
  font-family: var(--serif);
  font-size: clamp(36px, 5vw, 54px);
  font-weight: 400;
  letter-spacing: -0.02em;
  line-height: 1.1;
  margin: 20px 0 16px;
}

.cta-title em {
  font-style: italic;
  color: var(--brand-accent);
}

.cta-sub {
  font-size: 16px;
  color: var(--fg-secondary);
  line-height: 1.6;
}

.footer-bottom {
  border-top: 1px solid var(--hairline);
  padding-top: 32px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
}

.footer-brand {
  display: flex;
  align-items: baseline;
  gap: 16px;
}

.footer-copy {
  font-size: 12px;
  color: var(--fg-tertiary);
}

.footer-links {
  display: flex;
  gap: 20px;
}

.footer-links a {
  font-size: 12.5px;
  color: var(--fg-secondary);
  text-decoration: none;
  transition: color 0.15s;
}

.footer-links a:hover {
  color: var(--bone);
}

/* ==========================================================================
   9. PREFERS-REDUCED-MOTION (ACESSIBILIDADE OBRIGATÓRIA DA SKILL)
   ========================================================================== */
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  .fan-card {
    transform: none !important;
  }
  .rl-how {
    height: auto;
  }
  .rl-how__stage {
    position: static;
    height: auto;
  }
  .rl-body {
    grid-template-columns: 1fr;
  }
  .rl-rail {
    display: none;
  }
  .rl-track {
    display: flex;
    flex-direction: column;
    padding: 32px 24px;
    transform: none !important;
  }
  .rl-chapter {
    flex: auto;
    width: 100%;
  }
  .hx-mobile-menu,
  .hx-mobile-backdrop,
  .hx-menu-toggle__bars span {
    transition: none;
  }
  .hx-mobile-menu {
    transform: none;
  }
}