/* ── VARIÁVEIS E RESET ── */
:root {
  --serif: 'Lora', serif;
  --mono: 'JetBrains Mono', monospace;
  --text: #dedad4;
  --text-2: #a8a8a8;
  --muted: #6a6a75;
  --surface: #1a1a1f;
  --border: #2a2a30;
  --border-2: #3a3a40;
  --amber: #c9a961;
  --t: 150ms ease;
}

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

html {
  background: #0f0f13;
  color: var(--text);
  font-family: var(--serif);
  font-size: 16px;
  line-height: 1.6;
}

body {
  background: #0f0f13;
  color: var(--text);
  font-family: var(--serif);
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

/* ── HEADER ── */
header {
  padding: 1.2rem 2rem;
  border-bottom: 1px solid var(--border);
  background: rgba(15, 15, 19, 0.95);
  backdrop-filter: blur(4px);
  position: sticky;
  top: 0;
  z-index: 100;
}

.site-name {
  font-family: var(--mono);
  font-size: 0.75rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--text);
  text-decoration: none;
  transition: color var(--t);
}

.site-name:hover {
  color: var(--amber);
}

.header-sep {
  color: var(--border-2);
  margin: 0 0.5rem;
}

.breadcrumb {
  color: var(--text-2);
  font-size: 0.9rem;
}

.breadcrumb-link {
  color: var(--text-2);
  text-decoration: none;
  transition: color var(--t);
}

.breadcrumb-link:hover {
  color: var(--text);
}

/* ── MAIN ── */
main {
  flex: 1;
  padding: 2rem;
  max-width: 900px;
  margin: 0 auto;
  width: 100%;
}

/* ── FADE ANIMATION ── */
.fade {
  animation: fadeIn 200ms ease;
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

.fade-out {
  animation: fadeOut 100ms ease;
}

@keyframes fadeOut {
  from { opacity: 1; }
  to { opacity: 0; }
}

/* ── GRID DE DISCIPLINAS ── */
.disc-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.2rem;
  margin-bottom: 2rem;
}

.disc-card {
  display: flex;
  flex-direction: column;
  padding: 1.2rem;
  border: 1px dashed var(--border);
  border-radius: 4px;
  text-decoration: none;
  color: var(--text);
  transition: all var(--t);
  cursor: pointer;
}

.disc-card:hover {
  border-color: var(--amber);
  background: color-mix(in srgb, var(--amber) 3%, transparent);
  transform: translateY(-2px);
}

.disc-card-name {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
  line-height: 1.3;
}

.disc-card-meta {
  font-family: var(--mono);
  font-size: 0.62rem;
  color: var(--muted);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

/* ── BOTÃO VOLTAR ── */
.disc-back {
  margin-bottom: 1.2rem;
}

.disc-back a {
  font-family: var(--mono);
  font-size: 0.68rem;
  color: var(--muted);
  text-decoration: none;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  transition: color var(--t);
}

.disc-back a:hover {
  color: var(--text-2);
}

/* ── DISCIPLINA ── */
.discipline {
  margin-bottom: 2.5rem;
}

.discipline-name {
  font-family: var(--mono);
  font-size: 0.68rem;
  color: var(--muted);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-bottom: 0.65rem;
  padding-bottom: 0.45rem;
  border-bottom: 1px solid var(--border);
}

/* ── INTRO/NOTAS DA DISCIPLINA ── */
.disc-intro {
  margin: 1.2rem 0 1.8rem;
  padding: 1rem 1.2rem;
  border-left: 2px solid var(--amber);
  background: color-mix(in srgb, var(--amber) 5%, transparent);
  border-radius: 0 4px 4px 0;
}

.disc-intro-prose {
  font-size: 0.9rem;
  color: var(--text-2);
  margin: 0;
}

.disc-intro-prose p:first-child {
  margin-top: 0;
}

.disc-intro-prose p:last-child {
  margin-bottom: 0;
}

.disc-intro-refs {
  margin-top: 0.75rem;
  padding-top: 0.5rem;
  border-top: 1px solid var(--border);
}

/* ── TÓPICOS (SUBPASTAS) ── */
.topic-section {
  margin-bottom: 0.5rem;
}

.topic-head {
  font-family: var(--mono);
  font-size: 0.62rem;
  color: var(--muted);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  margin: 1.4rem 0 0.3rem;
  padding-bottom: 0.3rem;
  border-bottom: 1px dashed var(--border);
}

.subject-group {
  padding: 0.85rem 0;
  border-bottom: 1px solid var(--border);
}

.subject-group:last-child {
  border-bottom: none;
}

.subject-head {
  font-size: 0.95rem;
  color: var(--text);
  margin-bottom: 0.5rem;
}

.item-row {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  padding: 0.35rem 0;
  cursor: pointer;
  text-decoration: none;
  color: var(--text-2);
  transition: opacity var(--t);
  gap: 1rem;
}

.item-row:hover {
  opacity: 0.55;
  color: var(--text);
}

.item-kind {
  font-family: var(--mono);
  font-size: 0.62rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--muted);
  min-width: 3.2rem;
  flex-shrink: 0;
}

.item-kind.txt {
  color: var(--amber);
}

.item-kind.qz {
  color: var(--text-2);
}

.item-title {
  flex: 1;
  font-size: 0.9rem;
}

.item-meta {
  font-family: var(--mono);
  font-size: 0.66rem;
  color: var(--muted);
  white-space: nowrap;
  flex-shrink: 0;
}

/* ── LEITOR DE TEXTOS & PROSE ── */
.text-meta {
  font-family: var(--mono);
  font-size: 0.68rem;
  color: var(--muted);
  margin-bottom: 1.4rem;
  letter-spacing: 0.02em;
  display: flex;
  gap: 0.6rem;
  align-items: center;
  flex-wrap: wrap;
}

.text-meta .dot {
  width: 3px;
  height: 3px;
  border-radius: 50%;
  background: var(--border-2);
}

.text-title {
  font-size: 1.4rem;
  line-height: 1.35;
  margin-bottom: 1.6rem;
  color: var(--text);
  font-weight: 600;
}

.prose {
  font-size: 1rem;
  line-height: 1.8;
  color: var(--text);
}

.prose p {
  margin-bottom: 1.1rem;
}

.prose h2 {
  font-family: var(--serif);
  font-size: 1.1rem;
  font-weight: 600;
  margin: 1.8rem 0 0.8rem;
  color: var(--text);
}

.prose h3 {
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
  margin: 1.6rem 0 0.6rem;
}

.prose blockquote {
  border-left: 2px solid var(--border-2);
  padding: 0.2rem 0 0.2rem 1rem;
  margin: 1rem 0;
  color: var(--text-2);
  font-style: italic;
}

.prose em {
  color: var(--text-2);
}

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

.prose code {
  font-family: var(--mono);
  font-size: 0.85em;
  background: var(--surface);
  padding: 0.05em 0.35em;
  border-radius: 2px;
  color: var(--text-2);
}

/* ── TABELAS ── */
.prose table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.8rem 0;
  font-size: 0.9rem;
  color: var(--text-2);
}

.prose th {
  font-family: var(--mono);
  font-size: 0.68rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--muted);
  border-bottom: 1px solid var(--border-2);
  padding: 0.5rem 0.6rem;
  text-align: left;
}

.prose td {
  padding: 0.6rem;
  border-bottom: 1px solid var(--border);
  vertical-align: top;
}

.prose tr:hover td {
  color: var(--text);
}

@media (max-width: 480px) {
  .prose table {
    overflow-x: auto;
    display: block;
  }
}

/* ── NOTAS DE RODAPÉ ── */
a[href^="#fn:"] {
  text-decoration: none;
  color: var(--amber);
  cursor: pointer;
  transition: opacity var(--t);
}

a[href^="#fn:"]:hover {
  opacity: 0.7;
}

a[href^="#fn:"].active {
  font-weight: 600;
}

.footnotes {
  margin-top: 2rem;
  padding-top: 1rem;
  border-top: 1px solid var(--border);
  font-size: 0.9rem;
}

.footnote-backref {
  text-decoration: none;
  color: var(--amber);
}

/* ── FLOATER (POPUP DE NOTAS) ── */
.floater {
  position: fixed;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 1rem;
  max-width: 320px;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.5);
  z-index: 1000;
  animation: slideUp 150ms ease;
}

@keyframes slideUp {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.f-label {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-family: var(--mono);
  font-size: 0.62rem;
  color: var(--muted);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-bottom: 0.5rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--border);
}

.f-close {
  cursor: pointer;
  font-size: 1.2rem;
  color: var(--text-2);
  transition: color var(--t);
}

.f-close:hover {
  color: var(--text);
}

.f-quote {
  font-size: 0.85rem;
  color: var(--text-2);
  font-style: italic;
  margin-bottom: 0.5rem;
}

/* ── SUMÁRIO (TOC) ── */
.toc {
  margin: 1.5rem 0 2rem;
  padding: 1rem;
  background: color-mix(in srgb, var(--amber) 3%, transparent);
  border: 1px solid var(--border);
  border-radius: 4px;
}

.toc-label {
  font-family: var(--mono);
  font-size: 0.62rem;
  color: var(--muted);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-bottom: 0.75rem;
}

#toc-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.toc-h2 {
  margin-bottom: 0.5rem;
}

.toc-h2 a {
  font-size: 0.95rem;
  color: var(--text);
  text-decoration: none;
  transition: color var(--t);
}

.toc-h2 a:hover {
  color: var(--amber);
}

.toc-h3 {
  margin-left: 1.2rem;
  margin-bottom: 0.3rem;
}

.toc-h3 a {
  font-size: 0.85rem;
  color: var(--text-2);
  text-decoration: none;
  transition: color var(--t);
}

.toc-h3 a:hover {
  color: var(--text);
}

/* ── REFERÊNCIAS ── */
.references {
  margin-top: 2rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border);
}

.ref-head {
  font-family: var(--mono);
  font-size: 0.62rem;
  color: var(--muted);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-bottom: 1rem;
}

.ref-list {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.ref-list p {
  font-size: 0.9rem;
  color: var(--text-2);
  margin: 0;
  line-height: 1.5;
}

/* ── QUIZ: LAYOUT GERAL ── */
.progress-wrap {
  width: 100%;
  height: 3px;
  background: var(--border);
  border-radius: 2px;
  overflow: hidden;
  margin-bottom: 1.5rem;
}

.progress-fill {
  height: 100%;
  background: var(--amber);
  width: 0%;
  transition: width 300ms ease;
}

.q-meta {
  font-family: var(--mono);
  font-size: 0.68rem;
  color: var(--muted);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: 1.2rem;
}

#quiz-body {
  margin-bottom: 1.5rem;
}

/* ── QUIZ: MÚLTIPLA ESCOLHA ── */
.q-text {
  font-size: 1rem;
  line-height: 1.8;
  color: var(--text);
  margin-bottom: 1.5rem;
}

.options {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  margin-bottom: 1.5rem;
}

.opt {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  padding: 0.75rem 1rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 4px;
  cursor: pointer;
  transition: all var(--t);
  font-family: var(--serif);
  font-size: 0.95rem;
  color: var(--text);
  text-align: left;
  min-height: 3rem;
}

.opt:hover:not(:disabled) {
  border-color: var(--amber);
  background: color-mix(in srgb, var(--amber) 5%, transparent);
}

.opt:disabled {
  cursor: not-allowed;
  opacity: 0.7;
}

.opt.correct {
  border-color: #4ade80;
  background: color-mix(in srgb, #4ade80 15%, transparent);
}

.opt.wrong {
  border-color: #ef4444;
  background: color-mix(in srgb, #ef4444 15%, transparent);
}

.opt.revealed {
  opacity: 0.5;
}

.opt-letter {
  font-family: var(--mono);
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--muted);
  min-width: 1.5rem;
  flex-shrink: 0;
}

/* ── QUIZ: RESPOSTA ABERTA ── */
.open-area {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

textarea {
  padding: 1rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 4px;
  color: var(--text);
  font-family: var(--serif);
  font-size: 0.95rem;
  line-height: 1.6;
  resize: vertical;
  min-height: 120px;
  transition: border-color var(--t);
}

textarea:focus {
  outline: none;
  border-color: var(--amber);
}

textarea::placeholder {
  color: var(--muted);
}

/* ── QUIZ: FEEDBACK ── */
.feedback-line {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--mono);
  font-size: 0.75rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--text-2);
  opacity: 0;
  transition: opacity var(--t);
}

.feedback-line.show {
  opacity: 1;
}

.feedback-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--text-2);
}

.feedback-line.ok .feedback-dot {
  background: #4ade80;
}

.feedback-line.bad .feedback-dot {
  background: #ef4444;
}

/* ── QUIZ: COMENTÁRIO ── */
.comment-block {
  padding: 1rem;
  background: color-mix(in srgb, var(--amber) 5%, transparent);
  border-left: 2px solid var(--amber);
  border-radius: 0 4px 4px 0;
  max-height: 0;
  overflow: hidden;
  transition: max-height var(--t);
}

.comment-block.show {
  max-height: 500px;
}

.comment-label {
  font-family: var(--mono);
  font-size: 0.62rem;
  color: var(--muted);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-bottom: 0.5rem;
}

.comment-block > div:last-child {
  font-size: 0.9rem;
  color: var(--text-2);
  line-height: 1.6;
}

/* ── QUIZ: REFERÊNCIA (RESPOSTA ABERTA) ── */
.ref-block {
  padding: 1rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 4px;
  max-height: 0;
  overflow: hidden;
  transition: max-height var(--t));
}

.ref-block.show {
  max-height: 500px;
}

.ref-label {
  font-family: var(--mono);
  font-size: 0.62rem;
  color: var(--muted);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-bottom: 0.5rem;
}

.ref-block > div:last-child {
  font-size: 0.9rem;
  color: var(--text-2);
  line-height: 1.6;
}

/* ── QUIZ: BOTÕES ── */
.next-row {
  display: flex;
  justify-content: flex-end;
  margin-top: 1.5rem;
}

.open-btns {
  display: flex;
  gap: 0.75rem;
  justify-content: flex-end;
}

.btn {
  padding: 0.6rem 1.2rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 4px;
  color: var(--text);
  font-family: var(--serif);
  font-size: 0.9rem;
  cursor: pointer;
  transition: all var(--t);
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.btn:hover:not(:disabled) {
  border-color: var(--amber);
  background: color-mix(in srgb, var(--amber) 10%, transparent);
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.btn-ok {
  border-color: #4ade80;
  color: #4ade80;
}

.btn-ok:hover:not(:disabled) {
  background: color-mix(in srgb, #4ade80 15%, transparent);
}

.btn-bad {
  border-color: #ef4444;
  color: #ef4444;
}

.btn-bad:hover:not(:disabled) {
  background: color-mix(in srgb, #ef4444 15%, transparent);
}

/* ── QUIZ: RESULTADO ── */
.res-score {
  font-size: 3rem;
  font-weight: 600;
  color: var(--amber);
  text-align: center;
  margin-bottom: 0.5rem;
}

.res-subtitle {
  font-size: 1rem;
  color: var(--text-2);
  text-align: center;
  margin-bottom: 1.5rem;
}

.res-divider {
  height: 1px;
  background: var(--border);
  margin: 1.5rem 0;
}

.res-stats {
  display: flex;
  justify-content: center;
  gap: 3rem;
  margin-bottom: 1.5rem;
}

.rs-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
}

.rs-num {
  font-size: 1.8rem;
  font-weight: 600;
}

.rs-num.g {
  color: #4ade80;
}

.rs-num.r {
  color: #ef4444;
}

.rs-label {
  font-family: var(--mono);
  font-size: 0.62rem;
  color: var(--muted);
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.res-msg {
  padding: 1rem;
  background: color-mix(in srgb, var(--amber) 5%, transparent);
  border-left: 2px solid var(--amber);
  border-radius: 0 4px 4px 0;
  margin-bottom: 1.5rem;
}

.res-msg-label {
  font-family: var(--mono);
  font-size: 0.62rem;
  color: var(--muted);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-bottom: 0.5rem;
}

.res-msg-body {
  font-size: 0.95rem;
  color: var(--text-2);
  line-height: 1.6;
}

.res-btns {
  display: flex;
  gap: 0.75rem;
  justify-content: center;
  flex-wrap: wrap;
}

/* ── EXTRAS DE DISCIPLINA (COLAPSÁVEIS) ── */
.disc-extras-wrap {
  margin: 1.5rem 0 2rem;
}

.disc-extra {
  margin-bottom: 0.75rem;
  border: 1px solid var(--border);
  border-radius: 4px;
  overflow: hidden;
}

.disc-extra-summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.75rem 1rem;
  background: var(--surface);
  cursor: pointer;
  user-select: none;
  transition: background var(--t);
}

.disc-extra-summary:hover {
  background: color-mix(in srgb, var(--amber) 5%, transparent);
}

.disc-extra-label {
  font-family: var(--mono);
  font-size: 0.68rem;
  color: var(--muted);
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.disc-extra-count {
  font-family: var(--mono);
  font-size: 0.62rem;
  color: var(--text-2);
  letter-spacing: 0.05em;
}

.disc-extra-chevron {
  color: var(--text-2);
  transition: transform var(--t);
}

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

.disc-extra-body {
  padding: 1rem;
  border-top: 1px solid var(--border);
}

.disc-extra-row {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.5rem 0;
  text-decoration: none;
  color: var(--text-2);
  transition: color var(--t);
}

.disc-extra-row:hover {
  color: var(--text);
}

.disc-extra-icon {
  font-size: 0.8rem;
  color: var(--muted);
  min-width: 1.2rem;
}

.disc-extra-name {
  flex: 1;
  font-size: 0.9rem;
}

.disc-extra-meta {
  font-family: var(--mono);
  font-size: 0.62rem;
  color: var(--muted);
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.disc-extra-prose {
  font-size: 0.9rem;
  color: var(--text-2);
}

.disc-extra-prose p {
  margin-bottom: 0.75rem;
}

.disc-extra-prose p:last-child {
  margin-bottom: 0;
}

.disc-extra-kind-label {
  font-family: var(--mono);
  font-size: 0.62rem;
  color: var(--muted);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin: 1rem 0 0.5rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px dashed var(--border);
}

.disc-extra-kind-label:first-child {
  margin-top: 0;
}

/* ── SUBJECT QUIZZES (LINKS PARA EXERCÍCIOS) ── */
.subject-quizzes {
  margin: 1.5rem 0 2rem;
  padding: 1rem;
  background: color-mix(in srgb, var(--amber) 3%, transparent);
  border: 1px solid var(--border);
  border-radius: 4px;
}

.sq-label {
  font-family: var(--mono);
  font-size: 0.62rem;
  color: var(--muted);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-bottom: 0.75rem;
}

.sq-list {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.sq-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.6rem 0.75rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 3px;
  text-decoration: none;
  color: var(--text);
  transition: all var(--t);
}

.sq-item:hover {
  border-color: var(--amber);
  background: color-mix(in srgb, var(--amber) 8%, transparent);
}

.sq-name {
  font-size: 0.9rem;
  flex: 1;
}

.sq-meta {
  font-family: var(--mono);
  font-size: 0.62rem;
  color: var(--muted);
  letter-spacing: 0.05em;
  text-transform: uppercase;
  flex-shrink: 0;
}

/* ── SUBJECT LIST ── */
.subject-list {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.subject-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.75rem 0;
  border-bottom: 1px solid var(--border);
  text-decoration: none;
  color: var(--text);
  transition: all var(--t);
}

.subject-row:last-child {
  border-bottom: none;
}

.subject-row:hover {
  color: var(--amber);
  padding-left: 0.5rem;
}

.subject-row-name {
  font-size: 0.95rem;
  flex: 1;
}

.subject-row-meta {
  font-family: var(--mono);
  font-size: 0.62rem;
  color: var(--muted);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  flex-shrink: 0;
}

.empty-note {
  font-size: 0.9rem;
  color: var(--muted);
  font-style: italic;
  padding: 1rem 0;
}

/* ── RESPONSIVIDADE ── */
@media (max-width: 768px) {
  main {
    padding: 1.5rem;
  }

  .disc-grid {
    grid-template-columns: 1fr;
  }

  .res-stats {
    gap: 2rem;
  }

  header {
    padding: 1rem 1.5rem;
  }
}

@media (max-width: 480px) {
  main {
    padding: 1rem;
  }

  .text-title {
    font-size: 1.2rem;
  }

  .prose {
    font-size: 0.95rem;
  }

  .options {
    gap: 0.5rem;
  }

  .opt {
    padding: 0.6rem 0.75rem;
    min-height: 2.5rem;
  }

  .floater {
    max-width: 280px;
  }

  .res-score {
    font-size: 2.5rem;
  }

  .res-stats {
    gap: 1.5rem;
  }
}

/* ── FLASHCARD ── */
.flashcard-area {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.flashcard {
  perspective: 1000px;
  cursor: pointer;
  height: 300px;
  position: relative;
}

.flashcard-front,
.flashcard-back {
  position: absolute;
  width: 100%;
  height: 100%;
  backface-visibility: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 2px solid var(--amber);
  border-radius: 4px;
  padding: 2rem;
  text-align: center;
  transition: transform 0.6s;
}

.flashcard-front {
  background: var(--surface);
  color: var(--text);
  transform: rotateY(0deg);
}

.flashcard-back {
  background: var(--amber);
  color: #0f0f13;
  transform: rotateY(180deg);
}

.flashcard.flipped .flashcard-front {
  transform: rotateY(180deg);
}

.flashcard.flipped .flashcard-back {
  transform: rotateY(0deg);
}

.flashcard-hint {
  font-size: 1.2rem;
  opacity: 0.7;
}

.flashcard-btns {
  display: flex;
  gap: 0.75rem;
  justify-content: center;
}

/* ── FILTRO NA HOME ── */
.filter-container {
  margin-bottom: 2rem;
  display: flex;
  gap: 1rem;
  align-items: center;
}

.filter-input {
  flex: 1;
  padding: 0.75rem 1rem;
  background: var(--surface);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 4px;
  font-size: 1rem;
  font-family: var(--serif);
}

.filter-input:focus {
  outline: none;
  border-color: var(--amber);
}

.filter-count {
  color: var(--amber);
  font-size: 0.9rem;
  white-space: nowrap;
}

/* ── DASHBOARD ── */
.dashboard-container {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 2rem;
  margin-bottom: 2rem;
}

.dashboard-overview {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1rem;
  margin: 1.5rem 0;
}

.stat-card {
  background: #0f0f13;
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 1.5rem;
  text-align: center;
}

.stat-label {
  font-size: 0.9rem;
  color: var(--muted);
  margin-bottom: 0.5rem;
}

.stat-value {
  font-size: 2rem;
  font-weight: 600;
  color: var(--amber);
}

.dashboard-disciplines {
  margin-top: 2rem;
}

.disc-stat {
  margin-bottom: 1.5rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--border);
}

.disc-name {
  font-weight: 600;
  margin-bottom: 0.5rem;
}

.disc-bar {
  height: 8px;
  background: #0f0f13;
  border-radius: 4px;
  overflow: hidden;
  margin-bottom: 0.5rem;
}

.disc-progress {
  height: 100%;
  background: #4ade80;
  transition: width 0.3s;
}

.disc-info {
  display: flex;
  justify-content: space-between;
  font-size: 0.85rem;
  color: var(--muted);
}

.dashboard-actions {
  margin-top: 2rem;
  text-align: center;
}

/* ── MODO ESCURO TOGGLE ── */
#dark-mode-toggle {
  background: none;
  border: none;
  font-size: 1.5rem;
  cursor: pointer;
  margin-left: auto;
  padding: 0.5rem;
  border-radius: 4px;
  transition: background-color var(--t);
}

#dark-mode-toggle:hover {
  background-color: var(--border);
}

/* ── PRINT-FRIENDLY ── */
@media print {
  header,
  .filter-container,
  .dashboard-container,
  .btn,
  .next-row,
  #dark-mode-toggle,
  .flashcard-btns,
  .open-btns {
    display: none;
  }

  body {
    background: white;
    color: black;
    padding: 0;
  }

  main {
    max-width: 100%;
    padding: 0;
  }

  .q-text,
  .flashcard-back {
    page-break-inside: avoid;
  }

  .flashcard {
    border: 1px solid black;
    background: white;
    color: black;
  }

  .flashcard-front,
  .flashcard-back {
    position: static;
    transform: none;
    border: none;
    background: white;
    color: black;
  }
}

/* ── RESPONSIVIDADE MOBILE ── */
@media (max-width: 768px) {
  .dashboard-overview {
    grid-template-columns: 1fr;
  }

  .flashcard {
    height: 250px;
  }
}

@media (max-width: 480px) {
  .flashcard {
    height: 200px;
  }

  .filter-container {
    flex-direction: column;
  }

  .filter-input {
    width: 100%;
  }
}

/* ── QUIZ INLINE (dentro do assunto) ── */
.inline-quiz-wrap {
  margin: 2.5rem 0 1.5rem;
  border: 1px solid var(--border);
  border-radius: 4px;
  overflow: hidden;
}

.inline-quiz-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.9rem 1.2rem;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
}

.inline-quiz-head .sq-label {
  margin: 0;
  padding: 0;
  border: none;
}

.inline-quiz-link {
  font-family: var(--mono);
  font-size: 0.65rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
  text-decoration: none;
  transition: color var(--t);
}

.inline-quiz-link:hover {
  color: var(--amber);
}

#inline-quiz-body,
#inline-quiz-player,
#inline-quiz-result {
  padding: 1.2rem;
}

.btn-start-quiz {
  width: 100%;
  padding: 0.85rem;
  justify-content: center;
  background: color-mix(in srgb, var(--amber) 8%, transparent);
  border-color: var(--amber);
  color: var(--amber);
}

.btn-start-quiz:hover {
  background: color-mix(in srgb, var(--amber) 15%, transparent);
}

/* ── TABELA NA PROSE ── */
.prose table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.88rem;
  margin: 1.5rem 0;
}

.prose th {
  font-family: var(--mono);
  font-size: 0.7rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
  padding: 0.55rem 0.75rem;
  border-bottom: 1px solid var(--border-2);
  text-align: left;
}

.prose td {
  padding: 0.55rem 0.75rem;
  border-bottom: 1px solid var(--border);
  color: var(--text-2);
  vertical-align: top;
}

.prose tr:last-child td {
  border-bottom: none;
}

.prose tr:hover td {
  background: color-mix(in srgb, var(--amber) 3%, transparent);
}