:root {
  --bg: #050816;
  --accent: #38bdf8;
  --accent2: #a855f7;
  --text: #e5e7eb;
  --muted: #9ca3af;
  --border-subtle: rgba(148, 163, 184, 0.3);
  --radius-lg: 16px;
  --shadow-soft: 0 18px 45px rgba(15, 23, 42, 0.7);
  --transition-fast: 180ms ease-out;
}

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

body {
  font-family: "Inter", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: radial-gradient(circle at top, #0b1120 0, #020617 45%, #000 100%);
  color: var(--text);
  min-height: 100vh;
}

.page {
  max-width: 1040px;
  margin: 0 auto;
  padding: 2.5rem 1.25rem 3.2rem;
}

/* Link de voltar */

.back-link {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.85rem;
  color: var(--muted);
  text-decoration: none;
  margin-bottom: 1.35rem;
  transition: color var(--transition-fast), transform var(--transition-fast);
}

.back-link span {
  font-size: 1.1rem;
  line-height: 1;
}

.back-link:hover {
  color: var(--accent);
  transform: translateX(-2px);
}

/* Cabeçalho */

header {
  display: flex;
  flex-direction: column;
  gap: 0.9rem;
  margin-bottom: 1.9rem;
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.25rem 0.8rem;
  border-radius: 999px;
  background: rgba(56, 189, 248, 0.08);
  color: var(--accent);
  font-size: 0.8rem;
  border: 1px solid rgba(56, 189, 248, 0.4);
  width: fit-content;
}

.badge-dot {
  width: 8px;
  height: 8px;
  border-radius: 999px;
  background: var(--accent);
  box-shadow: 0 0 12px rgba(56, 189, 248, 0.9);
}

header h1 {
  font-size: clamp(1.7rem, 3vw, 2.1rem);
  letter-spacing: 0.03em;
  font-weight: 700;
}

header p {
  font-size: 0.95rem;
  color: var(--muted);
  max-width: 720px;
  line-height: 1.7;
}

/* Layout principal
   - páginas internas: main em grid
   - index (body.index-page): main em coluna única */

body:not(.index-page) main {
  display: grid;
  grid-template-columns: minmax(0, 2.3fr) minmax(0, 1.2fr);
  gap: 1.8rem;
}

/* Página específica com conteúdo em uma coluna só */
body.topic-page main {
  display: block;
}

@media (min-width: 880px) {
  .content-card img.example-image {
    max-width: 640px;
  }
}

/* Cartão de conteúdo principal */

.card {
  position: relative;
}

/* Versão canto superior direito */
.card-meta {
  position: absolute;
  top: 8px;
  right: 12px;
  font-size: 0.75rem;
  color: var(--muted);
}

/* Estilo visual da data */
.card-date {
  background-color: #e0f7fa;
  color: #006064;
  padding: 0.15rem 0.6rem;
  border-radius: 999px;
  border: 1px solid #b2ebf2;
}

/* Canto inferior esquerdo */
/*
.card-meta {
  position: absolute;
  bottom: 8px;
  left: 12px;
  font-size: 0.75rem;
  color: var(--muted);
}
*/

.content-card {
  border-radius: var(--radius-lg);
  background:
    linear-gradient(135deg, rgba(15, 23, 42, 0.97), rgba(15, 23, 42, 0.97)) padding-box,
    linear-gradient(135deg, rgba(56, 189, 248, 0.55), rgba(147, 51, 234, 0.5)) border-box;
  border: 1px solid transparent;
  padding: 1.6rem 1.7rem 1.9rem;
  box-shadow: var(--shadow-soft);
}

.content-card section + section {
  margin-top: 1.7rem;
}

/* Títulos de seções */

.section-title {
  font-size: 1rem;
  margin-bottom: 0.6rem;
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.section-title::before {
  content: "";
  width: 18px;
  height: 2px;
  border-radius: 999px;
  background: linear-gradient(90deg, var(--accent), transparent);
}

/* Texto base */

.content-card p {
  font-size: 0.93rem;
  color: var(--muted);
  line-height: 1.8;
  margin-bottom: 0.75rem;
}

.content-card ul,
.content-card ol {
  margin: 0.2rem 0 0.9rem 1.1rem;
  font-size: 0.92rem;
  color: var(--muted);
  line-height: 1.7;
}

.content-card li + li {
  margin-top: 0.25rem;
}

.highlight {
  color: var(--text);
  font-weight: 600;
}

/* Mídia (imagens, vídeos) */

.media-wrapper {
  margin: 0.4rem 0 0.8rem;
  border-radius: 12px;
  overflow: hidden;
  border: 1px solid rgba(148, 163, 184, 0.4);
  background: #020617;
}

.media-wrapper img,
.media-wrapper iframe,
.media-wrapper video {
  width: 100%;
  display: block;
}

.media-caption {
  font-size: 0.8rem;
  color: var(--muted);
  padding: 0.45rem 0.7rem 0.6rem;
}

/* Caixas de exemplo e atividades */

.example-box,
.activity-box {
  margin-top: 0.4rem;
  padding: 0.75rem 0.9rem;
  border-radius: 10px;
  font-size: 0.88rem;
}

.example-box {
  background: rgba(15, 23, 42, 0.95);
  border: 1px solid rgba(148, 163, 184, 0.35);
  color: var(--muted);
}

.activity-box {
  background: rgba(8, 47, 73, 0.88);
  border: 1px solid rgba(56, 189, 248, 0.5);
  color: var(--text);
}

.example-label,
.activity-title {
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 0.25rem;
}

.example-label {
  color: var(--accent2);
}

.activity-title {
  color: var(--accent);
}

/* Cartão lateral */

.side-card {
  border-radius: var(--radius-lg);
  background: rgba(15, 23, 42, 0.96);
  border: 1px solid var(--border-subtle);
  padding: 1.25rem 1.45rem 1.55rem;
  box-shadow: 0 14px 36px rgba(15, 23, 42, 0.85);
  display: flex;
  flex-direction: column;
  gap: 1.15rem;
  font-size: 0.9rem;
  color: var(--muted);
}

.side-section-title {
  font-size: 0.92rem;
  font-weight: 600;
  margin-bottom: 0.25rem;
  color: var(--text);
}

.tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}

.tag {
  padding: 0.18rem 0.55rem;
  border-radius: 999px;
  background: rgba(15, 23, 42, 0.9);
  border: 1px solid var(--border-subtle);
  font-size: 0.78rem;
  color: var(--muted);
}

.resources-list {
  list-style: none;
  padding-left: 0;
  margin-top: 0.3rem;
  font-size: 0.87rem;
}

.resources-list li + li {
  margin-top: 0.35rem;
}

.resources-list a {
  color: var(--accent);
  text-decoration: none;
}

.resources-list a:hover {
  text-decoration: underline;
}

/* HERO: cabeçalho com cartão principal + cartão lateral */

.hero {
  display: grid;
  grid-template-columns: minmax(0, 2.1fr) minmax(260px, 1.1fr);
  gap: 1.5rem;
  margin-bottom: 1.9rem;
}

/* Nesta página específica, hero em uma coluna só */
body.topic-page .hero {
  display: block;
}

.hero-main {
  border-radius: var(--radius-lg);
  background:
    linear-gradient(135deg, rgba(15, 23, 42, 0.97), rgba(15, 23, 42, 0.97)) padding-box,
    linear-gradient(135deg, rgba(56, 189, 248, 0.55), rgba(147, 51, 234, 0.5)) border-box;
  border: 1px solid transparent;
  padding: 1.6rem 1.7rem 1.8rem;
  box-shadow: var(--shadow-soft);
}

.hero-title {
  font-size: clamp(1.9rem, 3vw, 2.4rem);
  letter-spacing: 0.02em;
  font-weight: 700;
  margin-bottom: 0.85rem;
}

.hero-title span {
  color: var(--accent);
}

.hero-text {
  font-size: 0.95rem;
  color: var(--muted);
  max-width: 720px;
  line-height: 1.7;
}

.hero-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 0.9rem;
}

/* Cartão lateral específico do hero */

.hero-side {
  border-radius: var(--radius-lg);
  background: rgba(15, 23, 42, 0.96);
  border: 1px solid var(--border-subtle);
  padding: 1.25rem 1.3rem 1.5rem;
  box-shadow: 0 14px 36px rgba(15, 23, 42, 0.85);
}

.side-title {
  font-size: 0.92rem;
  font-weight: 600;
  margin-bottom: 0.45rem;
  color: var(--text);
}

.side-list {
  list-style: none;
  font-size: 0.9rem;
  color: var(--muted);
}

.side-list li + li {
  margin-top: 0.45rem;
}

/* Layout alternativo deste tópico */

.layout {
  display: grid;
  grid-template-columns: minmax(0, 2.3fr) minmax(0, 1.2fr);
  gap: 1.8rem;
}

@media (max-width: 880px) {
  .hero,
  .layout {
    grid-template-columns: minmax(0, 1fr);
  }
}

/* Cartão lateral para materiais/recursos deste tópico */

.materials-card {
  border-radius: var(--radius-lg);
  background: rgba(15, 23, 42, 0.96);
  border: 1px solid var(--border-subtle);
  padding: 1.25rem 1.45rem 1.55rem;
  box-shadow: 0 14px 36px rgba(15, 23, 42, 0.85);
  display: flex;
  flex-direction: column;
  gap: 1.15rem;
  font-size: 0.9rem;
  color: var(--muted);
}

/* Lista de recursos específica deste tópico */

.resource-list {
  list-style: none;
  padding-left: 0;
  margin-top: 0.3rem;
  font-size: 0.87rem;
}

.resource-list li + li {
  margin-top: 0.6rem;
}

.resource-list strong {
  color: var(--text);
}

/* Imagens de exemplo dentro do conteúdo */
.content-card img.example-image {
  display: block;
  max-width: 100%;
  height: auto;
  margin-top: 0.4rem;
  border-radius: 12px;
}

/* --------- INDEX IHC: GRID DE TÓPICOS + BADGE DE DATA --------- */

.topics-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1.1rem;
}

/* Cards bem próximos do index original */
.topic-card {
  position: relative;
  border-radius: 12px;
  background:
    radial-gradient(circle at top left, rgba(56, 189, 248, 0.12), transparent 55%),
    radial-gradient(circle at bottom right, rgba(129, 140, 248, 0.15), transparent 55%),
    rgba(15, 23, 42, 0.96);
  border: 1px solid rgba(148, 163, 184, 0.55);
  padding: 1.05rem 1.1rem 1.15rem;
  cursor: pointer;
  transition: transform var(--transition-fast),
              box-shadow var(--transition-fast),
              border-color var(--transition-fast),
              background 220ms ease-out;
  box-shadow: 0 16px 40px rgba(15, 23, 42, 0.8);
}

.topic-card:hover {
  transform: translateY(-3px) translateZ(0);
  box-shadow: 0 22px 55px rgba(15, 23, 42, 0.95);
  border-color: rgba(56, 189, 248, 0.9);
  background:
    radial-gradient(circle at top left, rgba(56, 189, 248, 0.25), transparent 60%),
    radial-gradient(circle at bottom right, rgba(129, 140, 248, 0.28), transparent 60%),
    rgba(15, 23, 42, 1);
}

.topic-title {
  font-size: 0.94rem;
  font-weight: 600;
  margin-bottom: 0.28rem;
  color: var(--text);
}

.topic-desc {
  font-size: 0.83rem;
  color: var(--muted);
  margin-bottom: 0.55rem;
}

.topic-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.76rem;
  color: var(--muted);
  margin-top: 0.1rem;
}

.topic-meta span {
  display: inline-flex;
  align-items: center;
  gap: 0.28rem;
}

.topic-meta span::before {
  content: "";
  width: 7px;
  height: 7px;
  border-radius: 999px;
  background: rgba(56, 189, 248, 0.7);
}

.topic-card a {
  position: absolute;
  inset: 0;
  text-indent: -9999px;
  overflow: hidden;
  white-space: nowrap;
}

/* Badge de data */
.topic-date {
  position: absolute;
  top: 8px;
  right: 12px;
  padding: 0.1rem 0.45rem;
  border-radius: 999px;
  background: rgba(15, 23, 42, 0.92);
  border: 1px solid rgba(148, 163, 184, 0.4);
  font-size: 0.68rem;
  color: #cbd5f5;
  z-index: 1;
  pointer-events: none;
  opacity: 0.9;
}

/* Rodapé */

footer {
  max-width: 1040px;
  margin: 0 auto;
  padding: 1.9rem 1.25rem 2.5rem;
  font-size: 0.8rem;
  color: var(--muted);
}

/* --------- CLASSES ADICIONAIS PARA PÁGINAS DIDÁTICAS --------- */

.note-box,
.dialogue-box {
  margin-top: 0.4rem;
  padding: 0.75rem 0.9rem;
  border-radius: 10px;
  font-size: 0.88rem;
}

.note-box {
  background: rgba(88, 28, 135, 0.16);
  border: 1px solid rgba(168, 85, 247, 0.45);
  color: var(--text);
}

.dialogue-box {
  background: rgba(8, 61, 46, 0.35);
  border: 1px solid rgba(52, 211, 153, 0.35);
  color: var(--text);
}

.study-plan {
  display: grid;
  gap: 0.9rem;
  margin-top: 0.9rem;
}

.plan-step {
  padding: 0.85rem 0.95rem;
  border-radius: 12px;
  border: 1px solid var(--border-subtle);
  background: rgba(15, 23, 42, 0.72);
  color: var(--muted);
  line-height: 1.7;
}

.plan-step strong {
  color: var(--text);
}

.mini-table {
  width: 100%;
  border-collapse: collapse;
  margin: 0.75rem 0 1rem;
  font-size: 0.88rem;
  color: var(--muted);
}

.mini-table th,
.mini-table td {
  border: 1px solid rgba(148, 163, 184, 0.25);
  padding: 0.7rem;
  vertical-align: top;
  text-align: left;
}

.mini-table th {
  color: var(--text);
  background: rgba(15, 23, 42, 0.92);
}

.checklist {
  list-style: none;
  margin-left: 0;
}

.checklist li {
  padding-left: 1.35rem;
  position: relative;
}

.checklist li::before {
  content: "•";
  position: absolute;
  left: 0;
  color: var(--accent);
}

/* --------- LINKS --------- */

.resource-list a {
  color: #bfdbfe;              /* azul claro, boa leitura no fundo escuro */
  text-decoration: none;
  font-weight: 500;
  transition: color var(--transition-fast),
              text-decoration-color var(--transition-fast);
}

.resource-list a:hover {
  color: #e0f2fe;              /* mais claro no hover */
  text-decoration: underline;
  text-decoration-color: #e0f2fe;
}

.resource-list a:visited {
  color: #93c5fd;              /* tom levemente diferente p/ links já visitados */
}

.resource-list a:focus-visible {
  outline: 2px solid var(--accent2);
  outline-offset: 2px;
}