:root {
  --diagram-scale: 75%;
  --header-height: 58px;
  --player-height: 78px;
  --page-max: 1480px;
  --bg: var(--stagira-bg-950, #06111d);
  --surface: var(--stagira-surface-850, #0f2236);
  --surface-2: var(--stagira-surface-800, #132b42);
  --border: var(--stagira-border, #284763);
  --text: var(--stagira-text-100, #eaf5ff);
  --muted: var(--stagira-text-400, #9ebbd2);
  --primary: var(--stagira-primary-400, #5ab4ff);
  --primary-strong: var(--stagira-primary-600, #167cc4);
  --focus: var(--stagira-focus-400, #ffd84a);
  --danger: var(--stagira-danger-400, #ff7f8c);
}

* { box-sizing: border-box; }
html { min-height: 100%; scroll-behavior: smooth; background: var(--bg); }
body {
  margin: 0;
  min-height: 100vh;
  font-family: var(--stagira-font, Inter, "Segoe UI", Roboto, sans-serif);
  color: var(--text);
  background:
    radial-gradient(circle at 14% 8%, rgba(44,157,244,.10), transparent 30rem),
    linear-gradient(180deg, #06111d 0%, #081725 48%, #06111d 100%);
}
button, input { font: inherit; }
button, a { -webkit-tap-highlight-color: transparent; }
button { border: 0; }

/* Cabeçalho institucional */
.site-header {
  min-height: var(--header-height);
  position: sticky;
  top: 0;
  z-index: 60;
  border-bottom: 1px solid rgba(119,199,255,.14);
  background: rgba(6,17,29,.92);
  backdrop-filter: blur(16px);
}
.site-header__inner {
  width: min(var(--page-max), calc(100% - 32px));
  min-height: var(--header-height);
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}
.brand { display: inline-flex; align-items: center; text-decoration: none; flex: 0 0 auto; }
.brand img { width: 166px; height: auto; display: block; }
.header-actions, .catalog-nav { display: flex; align-items: center; gap: 10px; }
.header-link {
  color: var(--muted);
  text-decoration: none;
  font-size: .84rem;
  font-weight: 700;
  padding: 8px 10px;
  border-radius: 8px;
  transition: var(--stagira-transition, 160ms ease);
}
.header-link:hover, .header-link.is-active { color: var(--text); background: rgba(119,199,255,.08); }
.environment-badge {
  color: var(--primary);
  font-size: .67rem;
  font-weight: 800;
  letter-spacing: .12em;
  border: 1px solid rgba(90,180,255,.34);
  border-radius: 999px;
  padding: 7px 10px;
}
.icon-button {
  width: 38px;
  height: 38px;
  display: grid;
  place-items: center;
  border-radius: 10px;
  color: var(--muted);
  background: transparent;
  cursor: pointer;
  transition: var(--stagira-transition, 160ms ease);
}
.icon-button:hover { color: var(--primary); background: rgba(119,199,255,.09); }

/* Catálogo */
.catalog-hero { border-bottom: 1px solid rgba(119,199,255,.10); overflow: hidden; }
.catalog-hero__inner {
  width: min(1180px, calc(100% - 32px));
  min-height: 390px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: minmax(0, 1fr) 300px;
  align-items: center;
  gap: 40px;
  padding: 54px 0 44px;
}
.catalog-hero h1 {
  margin: 9px 0 18px;
  font-family: var(--stagira-font-display, Manrope, Inter, sans-serif);
  font-size: clamp(3rem, 8vw, 5.8rem);
  line-height: .92;
  letter-spacing: -.055em;
}
.catalog-hero h1 span { color: var(--primary); }
.catalog-hero p:not(.eyebrow) { max-width: 660px; margin: 0; color: var(--muted); font-size: 1.06rem; line-height: 1.7; }
.hero-symbol { width: min(100%, 270px); justify-self: end; opacity: .96; filter: drop-shadow(0 28px 48px rgba(44,157,244,.16)); }
.eyebrow { margin: 0; color: var(--primary); font-size: .69rem; font-weight: 850; letter-spacing: .19em; }
.catalog-shell { width: min(1180px, calc(100% - 32px)); margin: 0 auto; padding: 50px 0 74px; }
.section-heading { display: flex; justify-content: space-between; align-items: end; gap: 28px; margin-bottom: 24px; }
.section-heading h2 { margin: 7px 0 0; font-family: var(--stagira-font-display, Manrope, sans-serif); font-size: clamp(1.8rem, 4vw, 2.6rem); }
.section-heading > p { max-width: 410px; margin: 0; color: var(--muted); text-align: right; line-height: 1.55; }
.lesson-grid { display: grid; grid-template-columns: repeat(3, minmax(0,1fr)); gap: 18px; }
.lesson-card {
  min-height: 250px;
  display: flex;
  flex-direction: column;
  padding: 23px;
  border: 1px solid var(--border);
  border-radius: var(--stagira-radius-md, 14px);
  background: linear-gradient(145deg, rgba(15,34,54,.96), rgba(8,23,37,.98));
  box-shadow: var(--stagira-shadow-sm, 0 5px 14px rgba(0,0,0,.24));
  transition: transform 180ms ease, border-color 180ms ease, box-shadow 180ms ease;
}
.lesson-card:hover { transform: translateY(-3px); border-color: var(--stagira-border-strong, #3b6d91); box-shadow: var(--stagira-shadow-md, 0 14px 38px rgba(0,0,0,.32)); }
.lesson-card .type { color: var(--primary); font-size: .7rem; font-weight: 850; letter-spacing: .14em; }
.lesson-card h3 { margin: 12px 0 9px; font-size: 1.28rem; line-height: 1.25; }
.lesson-card p { margin: 0; color: var(--muted); line-height: 1.58; flex: 1; }
.lesson-card a { margin-top: 22px; color: #06111d; text-decoration: none; background: var(--primary); padding: 11px 15px; border-radius: 9px; text-align: center; font-weight: 850; transition: var(--stagira-transition, 160ms ease); }
.lesson-card a:hover { background: #8bd1ff; }

/* Faixa compacta da aula */
.lesson-strip { border-bottom: 1px solid rgba(119,199,255,.11); background: rgba(8,23,37,.78); }
.lesson-strip__inner {
  width: min(var(--page-max), calc(100% - 32px));
  min-height: 70px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 9px 0;
}
.lesson-identity { min-width: 0; }
.lesson-title-row { display: flex; align-items: center; gap: 12px; min-width: 0; margin-top: 3px; }
.lesson-title-row h1 {
  margin: 0;
  max-width: min(64vw, 900px);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  font-family: var(--stagira-font-display, Manrope, sans-serif);
  font-size: clamp(1.1rem, 2.4vw, 1.55rem);
  letter-spacing: -.02em;
}
.lesson-description { margin: 2px 0 0; color: var(--muted); font-size: .78rem; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; max-width: 900px; }
.block-pill { flex: 0 0 auto; color: var(--primary); background: rgba(90,180,255,.09); border: 1px solid rgba(90,180,255,.22); border-radius: 999px; padding: 5px 9px; font-size: .66rem; font-weight: 800; letter-spacing: .04em; }
.step-summary { flex: 0 0 auto; color: var(--muted); font-size: .78rem; }

/* Área principal: conteúdo sobe e ocupa a tela */
.lesson-main {
  width: min(var(--page-max), calc(100% - 24px));
  margin: 10px auto 0;
  padding-bottom: calc(var(--player-height) + 26px);
}
.diagram-panel {
  min-height: calc(100vh - var(--header-height) - 70px - var(--player-height) - 32px);
  position: relative;
  overflow: auto;
  border: 1px solid rgba(40,71,99,.86);
  border-radius: var(--stagira-radius-md, 14px);
  background: linear-gradient(150deg, rgba(15,34,54,.78), rgba(6,17,29,.92));
  box-shadow: var(--stagira-shadow-md, 0 14px 38px rgba(0,0,0,.32));
}
.diagram-stage {
  min-height: calc(100vh - var(--header-height) - 70px - var(--player-height) - 94px);
  padding: clamp(12px, 2vw, 28px);
  display: grid;
  place-items: center;
}
.narration-strip {
  position: sticky;
  left: 0;
  bottom: 0;
  width: 100%;
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 12px clamp(14px, 2vw, 24px);
  border-top: 1px solid rgba(119,199,255,.12);
  background: rgba(6,17,29,.91);
  backdrop-filter: blur(12px);
}
.narration-strip p { margin: 0; color: var(--stagira-text-200, #d8ecff); line-height: 1.55; font-size: .9rem; }
.narration-mark { width: 7px; height: 7px; flex: 0 0 auto; margin-top: .5em; border-radius: 50%; background: var(--focus); box-shadow: 0 0 16px rgba(255,216,74,.46); }
.error-message { color: var(--danger); line-height: 1.5; }

/* Player único */
.lesson-player {
  position: fixed;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 50;
  min-height: var(--player-height);
  padding: 9px max(12px, env(safe-area-inset-right)) calc(9px + env(safe-area-inset-bottom)) max(12px, env(safe-area-inset-left));
  border-top: 1px solid rgba(119,199,255,.17);
  background: rgba(6,17,29,.94);
  backdrop-filter: blur(18px);
  box-shadow: 0 -12px 34px rgba(0,0,0,.28);
}
.lesson-player__inner { width: min(1080px, 100%); margin: 0 auto; display: grid; grid-template-columns: 38px 50px 38px minmax(0,1fr); align-items: center; gap: 8px; }
.transport-button, .play-button { display: grid; place-items: center; cursor: pointer; transition: var(--stagira-transition, 160ms ease); }
.transport-button { width: 38px; height: 38px; border-radius: 50%; color: var(--muted); background: transparent; font-size: 1.75rem; line-height: 1; }
.transport-button:hover { color: var(--primary); background: rgba(119,199,255,.08); }
.play-button { width: 48px; height: 48px; border-radius: 50%; color: #06111d; background: var(--focus); font-size: 1rem; box-shadow: 0 8px 26px rgba(255,216,74,.18); }
.play-button:hover { transform: scale(1.04); }
.transport-button:disabled { opacity: .28; cursor: not-allowed; }
.progress-control { min-width: 0; display: grid; gap: 4px; }
#progress-seek { width: 100%; height: 22px; margin: 0; cursor: pointer; accent-color: var(--primary); }
.progress-meta { display: flex; justify-content: space-between; color: var(--muted); font-size: .68rem; }
.progress-hint { opacity: .65; }

/* Painel de configurações */
.settings-panel {
  position: fixed;
  z-index: 90;
  top: calc(var(--header-height) + 10px);
  right: max(12px, calc((100vw - var(--page-max)) / 2));
  width: min(340px, calc(100% - 24px));
  padding: 20px;
  border: 1px solid var(--border);
  border-radius: var(--stagira-radius-md, 14px);
  background: rgba(15,34,54,.98);
  box-shadow: 0 24px 70px rgba(0,0,0,.48);
}
.settings-panel__header { display: flex; align-items: start; justify-content: space-between; gap: 14px; margin-bottom: 20px; }
.settings-panel h2 { margin: 5px 0 0; font-size: 1.25rem; }
.settings-backdrop { position: fixed; inset: 0; z-index: 80; background: rgba(0,0,0,.36); }
.toggle-row { display: flex; align-items: center; gap: 10px; color: var(--text); margin-bottom: 18px; }
.range-field { display: grid; gap: 8px; color: var(--muted); margin-top: 16px; font-size: .86rem; }
.range-field > span { display: flex; justify-content: space-between; gap: 12px; }
.range-field output { color: var(--primary); font-weight: 800; }
.range-field input { width: 100%; accent-color: var(--primary-strong); }
.settings-actions { display: grid; grid-template-columns: 1fr 1fr; gap: 9px; margin-top: 22px; }
.text-button { padding: 10px; border: 1px solid var(--border); border-radius: 9px; color: var(--primary); background: rgba(6,17,29,.5); cursor: pointer; }
.text-button:hover { border-color: var(--stagira-border-strong, #3b6d91); }

/* Rodapé */
.site-footer { border-top: 1px solid rgba(119,199,255,.10); background: rgba(6,17,29,.72); }
.site-footer__inner { width: min(1180px, calc(100% - 32px)); min-height: 116px; margin: 0 auto; display: grid; grid-template-columns: 170px 1fr auto; align-items: center; gap: 24px; color: var(--muted); font-size: .76rem; }
.site-footer img { width: 145px; opacity: .78; }
.site-footer p { margin: 0; }
.player-page .site-footer { display: none; }

/* Storytelling preservado */
.storytelling-frame { width: var(--diagram-scale, 75%); max-width: none; margin: 0 auto; display: grid; gap: 18px; animation: stagiraStoryIn .34s ease both; }
.storytelling-image-wrap { overflow: hidden; border: 1px solid rgba(90,180,255,.72); border-radius: 16px; background: rgba(7,17,31,.68); box-shadow: 0 20px 45px rgba(0,0,0,.36), 0 0 28px rgba(44,157,244,.08); }
.storytelling-image-wrap img { display: block; width: 100%; max-height: 62vh; object-fit: contain; }
.storytelling-caption { text-align: center; }
.storytelling-caption h2 { margin: 0 0 7px; color: var(--primary); }
.storytelling-caption p { margin: 0; color: var(--muted); line-height: 1.55; }
@keyframes stagiraStoryIn { from { opacity: 0; transform: translateY(8px); } to { opacity: 1; transform: none; } }

@media (max-width: 980px) {
  .lesson-grid { grid-template-columns: repeat(2, minmax(0,1fr)); }
  .catalog-hero__inner { grid-template-columns: 1fr 210px; }
  .lesson-description { max-width: 65vw; }
}

@media (max-width: 720px) {
  :root { --header-height: 54px; --player-height: 72px; }
  .site-header__inner, .lesson-strip__inner { width: min(100% - 22px, var(--page-max)); }
  .brand img { width: 142px; }
  .header-link { display: none; }
  .environment-badge { font-size: .58rem; padding: 6px 8px; }
  .catalog-hero__inner { min-height: 330px; grid-template-columns: 1fr; padding: 42px 0 36px; }
  .catalog-hero h1 { font-size: clamp(2.8rem, 17vw, 4.4rem); }
  .hero-symbol { display: none; }
  .catalog-shell { padding-top: 38px; }
  .section-heading { display: block; }
  .section-heading > p { margin-top: 10px; text-align: left; }
  .lesson-grid { grid-template-columns: 1fr; }
  .lesson-strip__inner { min-height: 63px; padding: 7px 0; }
  .lesson-title-row { gap: 7px; }
  .lesson-title-row h1 { max-width: 65vw; font-size: 1.05rem; }
  .lesson-description { display: none; }
  .block-pill { max-width: 35vw; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; font-size: .59rem; }
  .step-summary { display: none; }
  .lesson-main { width: calc(100% - 12px); margin-top: 6px; padding-bottom: calc(var(--player-height) + 14px); }
  .diagram-panel { min-height: calc(100svh - var(--header-height) - 63px - var(--player-height) - 18px); border-radius: 11px; }
  .diagram-stage { min-height: calc(100svh - var(--header-height) - 63px - var(--player-height) - 76px); padding: 9px; }
  .narration-strip { padding: 10px 12px; }
  .narration-strip p { font-size: .82rem; }
  .lesson-player { padding-top: 7px; }
  .lesson-player__inner { grid-template-columns: 32px 44px 32px minmax(0,1fr); gap: 5px; }
  .transport-button { width: 32px; height: 32px; }
  .play-button { width: 42px; height: 42px; }
  .progress-hint { display: none; }
  .settings-panel { top: calc(var(--header-height) + 6px); right: 8px; width: calc(100% - 16px); }
  .site-footer__inner { grid-template-columns: 1fr; gap: 8px; padding: 28px 0; text-align: center; }
  .site-footer img { justify-self: center; }
  .storytelling-frame { width: min(var(--diagram-scale, 75%), 100%); }
}

@media (max-width: 420px) {
  .catalog-nav .environment-badge { display: none; }
  .lesson-player__inner { grid-template-columns: 30px 42px 30px minmax(0,1fr); }
  .progress-meta { font-size: .62rem; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { scroll-behavior: auto !important; animation-duration: .01ms !important; transition-duration: .01ms !important; }
}

/* Fase 1B.1 — escala acessível e transportes autorais */
.lesson-tools { display: flex; align-items: center; justify-content: flex-end; gap: 14px; flex: 0 0 auto; }
.scale-control {
  display: grid;
  grid-template-columns: 28px minmax(92px, 150px) 28px 44px 32px;
  align-items: center;
  gap: 6px;
  padding: 5px 7px;
  border: 1px solid rgba(90,180,255,.18);
  border-radius: 12px;
  background: rgba(6,17,29,.48);
}
.scale-control[hidden] { display: none !important; }
.scale-control input[type="range"] {
  width: 100%;
  height: 16px;
  margin: 0;
  accent-color: var(--primary);
  cursor: pointer;
}
.scale-control output { color: var(--primary); font-size: .72rem; font-weight: 800; text-align: center; }
.scale-button, .scale-fit-button {
  display: grid;
  place-items: center;
  width: 28px;
  height: 28px;
  padding: 0;
  border-radius: 8px;
  color: var(--muted);
  background: transparent;
  cursor: pointer;
}
.scale-button { font-size: 1.15rem; line-height: 1; }
.scale-button:hover, .scale-fit-button:hover { color: var(--primary); background: rgba(90,180,255,.08); }
.scale-fit-button svg { width: 16px; height: 16px; fill: none; stroke: currentColor; stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round; }

.transport-button, .play-button { transition: none; }
.transport-button svg { width: 21px; height: 21px; fill: none; stroke: currentColor; stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round; }
.play-button {
  border: 1px solid rgba(255,216,74,.72);
  color: var(--focus);
  background: rgba(255,216,74,.07);
  box-shadow: none;
}
.play-button:hover { transform: none; background: rgba(255,216,74,.11); }
.play-button svg { width: 22px; height: 22px; fill: currentColor; stroke: currentColor; stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round; }
.play-button .pause-icon { fill: none; }
.transport-button:hover { background: transparent; color: var(--primary); }

@media (max-width: 900px) {
  .scale-control { grid-template-columns: 26px minmax(72px, 110px) 26px 40px 30px; }
}
@media (max-width: 720px) {
  .lesson-strip__inner { gap: 8px; }
  .lesson-tools { gap: 6px; }
  .scale-control { grid-template-columns: 26px 76px 26px 38px; padding: 4px 5px; gap: 3px; }
  .scale-fit-button { display: none; }
  .scale-control output { font-size: .66rem; }
  .lesson-title-row h1 { max-width: 44vw; }
}
@media (max-width: 430px) {
  .scale-control { grid-template-columns: 24px 58px 24px 34px; }
  .scale-button { width: 24px; height: 24px; }
  .lesson-title-row h1 { max-width: 38vw; }
}

/* Fase 1C — integração e estabilização */
.ui-icon {
  width: 20px;
  height: 20px;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.7;
  stroke-linecap: round;
  stroke-linejoin: round;
}
button:focus-visible, a:focus-visible, input:focus-visible {
  outline: 2px solid var(--focus);
  outline-offset: 3px;
}
.diagram-stage {
  transition: opacity 150ms ease, transform 150ms ease;
  transform-origin: center center;
}
.diagram-stage.is-changing {
  opacity: .18;
  transform: scale(.992);
}
.scale-fit-button.is-auto {
  color: var(--focus);
  border-color: rgba(255,216,74,.48);
  background: rgba(255,216,74,.08);
}
@media (max-width: 760px) {
  .lesson-strip__inner { align-items: flex-start; }
  .lesson-tools { width: 100%; justify-content: space-between; }
  .scale-control { max-width: min(100%, 330px); }
  .diagram-panel { border-radius: 10px; }
  .diagram-stage { padding: 10px; }
}
@media (max-width: 480px) {
  .brand img { width: 132px; }
  .header-link { display: none; }
  .lesson-main { width: calc(100% - 10px); margin-top: 5px; }
  .lesson-strip__inner { width: calc(100% - 20px); }
  .lesson-title-row h1 { max-width: calc(100vw - 40px); }
  .block-pill { display: none; }
  .scale-control input[type="range"] { min-width: 82px; }
}
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { scroll-behavior: auto !important; transition-duration: .01ms !important; animation-duration: .01ms !important; }
}

/* Fase 1C.1 — marca ampliada e navegação por aulas do curso */
:root { --header-height: 78px; }
.site-header__inner { min-height: var(--header-height); }
.brand img { width: clamp(220px, 18vw, 276px); }

.lesson-workspace {
  display: grid;
  grid-template-columns: 248px minmax(0, 1fr);
  align-items: start;
  gap: 12px;
}
.diagram-column { min-width: 0; }
.course-sidebar {
  position: sticky;
  top: calc(var(--header-height) + 80px);
  max-height: calc(100vh - var(--header-height) - var(--player-height) - 104px);
  overflow: auto;
  border: 1px solid rgba(40,71,99,.86);
  border-radius: var(--stagira-radius-md, 14px);
  background: linear-gradient(150deg, rgba(15,34,54,.84), rgba(6,17,29,.94));
  box-shadow: var(--stagira-shadow-sm, 0 5px 14px rgba(0,0,0,.24));
}
.course-sidebar__header {
  position: sticky;
  top: 0;
  z-index: 2;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  padding: 15px 14px 12px;
  border-bottom: 1px solid rgba(119,199,255,.11);
  background: rgba(10,27,43,.96);
}
.course-sidebar h2 { margin: 4px 0 0; font-size: 1rem; }
.course-sidebar-toggle { display: none; }
.course-lessons { display: grid; padding: 8px; gap: 5px; }
.course-lesson-link {
  display: grid;
  grid-template-columns: 28px minmax(0,1fr);
  gap: 9px;
  align-items: center;
  padding: 10px 9px;
  color: var(--muted);
  text-decoration: none;
  border: 1px solid transparent;
  border-radius: 10px;
  transition: var(--stagira-transition, 160ms ease);
}
.course-lesson-link:hover { color: var(--text); background: rgba(119,199,255,.07); }
.course-lesson-link.is-current {
  color: var(--text);
  border-color: rgba(90,180,255,.34);
  background: linear-gradient(135deg, rgba(22,124,196,.31), rgba(90,180,255,.10));
}
.course-lesson-number {
  width: 28px;
  height: 28px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  color: var(--primary);
  background: rgba(90,180,255,.10);
  font-size: .7rem;
  font-weight: 850;
}
.course-lesson-link.is-current .course-lesson-number { color: #06111d; background: var(--focus); }
.course-lesson-copy { min-width: 0; }
.course-lesson-title { display: block; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; font-size: .79rem; font-weight: 800; }
.course-lesson-type { display: block; margin-top: 2px; color: var(--primary); font-size: .61rem; letter-spacing: .08em; }

@media (max-width: 980px) {
  :root { --header-height: 70px; }
  .brand img { width: clamp(196px, 28vw, 238px); }
  .lesson-workspace { grid-template-columns: 210px minmax(0,1fr); gap: 9px; }
}

@media (max-width: 720px) {
  :root { --header-height: 64px; }
  .brand img { width: 190px; }
  .lesson-workspace { display: block; }
  .course-sidebar {
    position: relative;
    top: auto;
    max-height: none;
    margin-bottom: 7px;
    border-radius: 11px;
  }
  .course-sidebar__header { padding: 9px 11px; }
  .course-sidebar h2 { font-size: .88rem; }
  .course-sidebar-toggle { display: grid; }
  .course-sidebar.is-collapsed .course-lessons { display: none; }
  .course-sidebar.is-collapsed .course-sidebar-toggle svg { transform: rotate(-90deg); }
  .course-lessons { max-height: 42vh; overflow: auto; }
  .course-lesson-link { padding: 8px; }
}

@media (max-width: 420px) {
  .brand img { width: 170px; }
}

/* Fase 3 — correção definitiva da marca no cabeçalho da página inicial */
.catalog-page .site-header .brand img {
  width: clamp(230px, 19vw, 292px);
  min-width: 230px;
  height: auto;
}
@media (max-width: 720px) {
  .catalog-page .site-header .brand img { width: 198px; min-width: 198px; }
}
@media (max-width: 420px) {
  .catalog-page .site-header .brand img { width: 176px; min-width: 176px; }
}


/* Hotfix responsivo do hero legado */
@media (max-width:720px) {
  .catalog-page { overflow-x:hidden; }
  .catalog-page .catalog-hero__inner > div { min-width:0; }
  .catalog-page .catalog-hero h1 { font-size:clamp(2.25rem,12vw,3.55rem); max-width:100%; line-height:.96; }
}
@media (max-width:420px) {
  .catalog-page .catalog-hero h1 { font-size:clamp(2rem,11vw,2.75rem); }
}

/* Produto 2.0.2 — experiência móvel do catálogo e do player */
@media (max-width: 720px) {
  /* Hero: a palavra Conhecimento precisa caber inteira mesmo em telas estreitas. */
  .catalog-page .catalog-hero__inner,
  .product-page .catalog-hero__inner {
    width: calc(100% - 24px);
  }
  .catalog-page .catalog-hero h1,
  .product-page .catalog-hero h1 {
    font-size: clamp(1.9rem, 9.4vw, 2.75rem);
    line-height: .98;
    letter-spacing: -.045em;
    max-width: 100%;
  }

  /* Aula: prioriza o conteúdo e reduz elementos auxiliares. */
  .player-page .lesson-strip__inner {
    width: calc(100% - 20px);
    min-height: 58px;
    gap: 10px;
    padding: 7px 0;
  }
  .player-page .lesson-description { display: none; }
  .player-page .lesson-title-row { gap: 7px; }
  .player-page .lesson-title-row h1 {
    max-width: none;
    white-space: normal;
    overflow: visible;
    text-overflow: clip;
    font-size: clamp(1rem, 4.7vw, 1.25rem);
    line-height: 1.12;
  }
  .player-page .block-pill { display: none; }
  .player-page .lesson-tools { gap: 7px; }
  .player-page .scale-control { display: none !important; }
  .player-page .step-summary { font-size: .7rem; white-space: nowrap; }

  .player-page .lesson-main {
    width: calc(100% - 12px);
    margin-top: 6px;
    padding-bottom: calc(var(--player-height) + 18px);
  }
  .player-page .course-sidebar {
    margin-bottom: 6px;
    border-radius: 10px;
  }
  .player-page .course-sidebar__header {
    min-height: 44px;
    padding: 7px 10px;
  }
  .player-page .course-sidebar__header .eyebrow { display: none; }
  .player-page .course-sidebar h2 { margin: 0; font-size: .82rem; }
  .player-page .course-lessons { max-height: 36vh; }

  .player-page .diagram-panel {
    min-height: calc(100dvh - var(--header-height) - 58px - var(--player-height) - 20px);
    border-radius: 10px;
  }
  .player-page .diagram-stage {
    min-height: calc(100dvh - var(--header-height) - 58px - var(--player-height) - 78px);
    padding: 10px 8px;
  }
  .player-page .narration-strip {
    gap: 9px;
    padding: 10px 11px;
  }
  .player-page .narration-strip p { font-size: .82rem; line-height: 1.42; }

  /* No celular, play/pause + barra substituem anterior/próximo. */
  .player-page .lesson-player {
    padding: 7px max(10px, env(safe-area-inset-right)) calc(7px + env(safe-area-inset-bottom)) max(10px, env(safe-area-inset-left));
  }
  .player-page .lesson-player__inner {
    grid-template-columns: 48px minmax(0, 1fr);
    gap: 10px;
  }
  .player-page .transport-button { display: none; }
  .player-page .play-button { width: 46px; height: 46px; }
  .player-page #progress-seek { height: 30px; touch-action: pan-x; }
  .player-page .progress-meta { font-size: .66rem; }
  .player-page .progress-hint { display: none; }
}

@media (max-width: 430px) {
  .catalog-page .catalog-hero h1,
  .product-page .catalog-hero h1 {
    font-size: clamp(1.8rem, 9vw, 2.35rem);
    letter-spacing: -.04em;
  }
  .player-page .lesson-player__inner {
    grid-template-columns: 46px minmax(0, 1fr);
  }
}