/* ==========================================================================
   Tema visual do Resumão — inspirado na estética do 3Blue1Brown:
   fundo escuro, cores vivas e movimento suave.
   ========================================================================== */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800&family=JetBrains+Mono:wght@400;600&display=swap');

:root {
  color-scheme: dark;
  --bg: #0e1116;
  --surface: #161a21;
  --surface-2: #1d222b;
  --surface-3: #262c37;
  --border: #2a303b;
  --text: #e6e8eb;
  --muted: #9aa3b0;
  --faint: #5d6673;

  /* Paleta "3b1b" */
  --blue: #58c4dd;
  --yellow: #f4d35e;
  --green: #83c167;
  --red: #fc6255;
  --teal: #5cd0b3;
  --purple: #b189f5;
  --orange: #ff9f43;
  --pink: #f78fb3;

  --radius: 12px;
  --font: 'Inter', system-ui, -apple-system, 'Segoe UI', sans-serif;
  --mono: 'JetBrains Mono', ui-monospace, 'SF Mono', Menlo, monospace;
  --dur: 450ms;
  --ease: cubic-bezier(.65, 0, .35, 1);
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.6;
}
a { color: var(--blue); text-decoration: none; }
a:hover { text-decoration: underline; }
code, kbd, pre { font-family: var(--mono); font-variant-ligatures: none; }
:not(pre) > code {
  background: var(--surface-2);
  border: 1px solid var(--border);
  padding: 0 .35em;
  border-radius: 6px;
  font-size: .9em;
}
kbd {
  background: var(--surface-3);
  border: 1px solid var(--border);
  border-bottom-width: 2px;
  border-radius: 5px;
  padding: 0 .4em;
  font-size: .8em;
}

/* ---------- Estrutura da página ---------- */
.topbar {
  position: sticky; top: 0; z-index: 10;
  display: flex; align-items: center; gap: 12px;
  padding: 10px 24px;
  background: color-mix(in srgb, var(--bg) 85%, transparent);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border);
  font-size: 14px;
}
.brand { font-weight: 800; color: var(--text); letter-spacing: -.01em; }
.brand span { color: var(--blue); }
.crumbs { color: var(--muted); display: flex; flex-wrap: wrap; gap: 6px; align-items: center; }
.crumbs a { color: var(--muted); }
.crumbs a:hover { color: var(--text); }
.crumbs .sep { color: var(--faint); }

.page { max-width: 1320px; margin: 0 auto; padding: 28px 24px 80px; }
.page-narrow { max-width: 860px; }

h1 { font-size: clamp(28px, 4vw, 40px); line-height: 1.15; margin: 8px 0 8px; letter-spacing: -.02em; }
h2 { font-size: 24px; margin: 48px 0 12px; letter-spacing: -.01em; }
h3 { font-size: 18px; margin: 28px 0 8px; }
.eyebrow { color: var(--blue); font-weight: 600; font-size: 13px; letter-spacing: .08em; text-transform: uppercase; }
.lead { color: var(--muted); font-size: 18px; max-width: 760px; margin: 0 0 24px; }

/* ---------- Texto explicativo ---------- */
.prose { max-width: 820px; }
.prose p, .prose li { color: #d4d8de; }
.prose strong { color: var(--text); }
.callout {
  border: 1px solid var(--border);
  border-left: 4px solid var(--blue);
  background: var(--surface);
  border-radius: 8px;
  padding: 12px 16px;
  margin: 16px 0;
}
.callout.warn { border-left-color: var(--yellow); }
.callout.tip { border-left-color: var(--green); }
.callout > :first-child { margin-top: 0; }
.callout > :last-child { margin-bottom: 0; }

.c-blue { color: var(--blue); } .c-yellow { color: var(--yellow); } .c-green { color: var(--green); }
.c-red { color: var(--red); } .c-teal { color: var(--teal); } .c-purple { color: var(--purple); }
.c-orange { color: var(--orange); } .c-pink { color: var(--pink); } .c-muted { color: var(--muted); }

/* ---------- Controles de formulário ---------- */
.toolbar {
  display: flex; flex-wrap: wrap; gap: 10px 14px; align-items: center;
  padding: 12px 14px; margin-bottom: 14px;
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius);
}
.toolbar label { display: inline-flex; align-items: center; gap: 8px; color: var(--muted); font-size: 14px; }
.toolbar .spacer { flex: 1; }
input[type=text], input[type=number], select, textarea {
  background: var(--surface-2); color: var(--text);
  border: 1px solid var(--border); border-radius: 8px;
  padding: 7px 10px; font: inherit; font-size: 14px;
}
input[type=text], textarea { font-family: var(--mono); }
input:focus, select:focus, textarea:focus, button:focus-visible { outline: 2px solid var(--blue); outline-offset: 1px; }
input[type=range] { accent-color: var(--blue); }
input[type=checkbox] { accent-color: var(--blue); width: 16px; height: 16px; }

.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 6px;
  background: var(--surface-2); color: var(--text);
  border: 1px solid var(--border); border-radius: 8px;
  padding: 7px 14px; font: inherit; font-size: 14px; font-weight: 500;
  cursor: pointer; transition: background .15s, border-color .15s, transform .1s;
}
.btn:hover { background: var(--surface-3); border-color: #3a4250; }
.btn:active { transform: translateY(1px); }
.btn.primary { background: var(--blue); color: #0b1a20; border-color: var(--blue); font-weight: 600; }
.btn.primary:hover { filter: brightness(1.08); }
.btn.small { padding: 4px 10px; font-size: 13px; }
.btn[aria-pressed=true] { border-color: var(--blue); color: var(--blue); }
.chips { display: flex; flex-wrap: wrap; gap: 6px; }

/* ---------- Player passo a passo ---------- */
.player {
  display: grid;
  grid-template-columns: minmax(0, 1.65fr) minmax(300px, 1fr);
  gap: 16px;
  align-items: start;
}
.player-main, .player-side { display: flex; flex-direction: column; gap: 12px; min-width: 0; }
.stage {
  background: radial-gradient(ellipse at 50% 0%, #161c25 0%, var(--surface) 70%);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
}
.stage svg { display: block; width: 100%; height: auto; }
.controls {
  display: flex; align-items: center; gap: 8px; flex-wrap: wrap;
  padding: 8px 10px;
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius);
}
.controls .icon-btn {
  width: 36px; height: 36px; padding: 0;
  display: inline-grid; place-items: center;
  background: var(--surface-2); border: 1px solid var(--border); border-radius: 8px;
  color: var(--text); cursor: pointer;
}
.controls .icon-btn:hover { background: var(--surface-3); }
.controls .icon-btn.play { background: var(--blue); border-color: var(--blue); color: #0b1a20; }
.controls .icon-btn svg { width: 16px; height: 16px; fill: currentColor; }
.controls .scrub { flex: 1; min-width: 120px; }
.controls .counter { font-family: var(--mono); font-size: 13px; color: var(--muted); min-width: 72px; text-align: right; }

.panel {
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius);
  overflow: hidden;
}
.panel-title {
  font-size: 12px; font-weight: 600; letter-spacing: .08em; text-transform: uppercase;
  color: var(--muted); padding: 10px 14px 0;
}
.panel-body { padding: 8px 14px 12px; }

.code {
  margin: 0; padding: 8px 0 10px;
  font-size: 13px; line-height: 1.65;
  max-height: 380px; overflow: auto;
  position: relative;
  counter-reset: line;
}
.code .ln {
  display: block; padding: 0 14px 0 0; white-space: pre;
  border-left: 3px solid transparent;
  transition: background .2s, border-color .2s;
}
.code .ln::before {
  counter-increment: line; content: counter(line);
  display: inline-block; width: 3ch; margin-right: 12px; text-align: right;
  color: var(--faint);
}
.code .ln.active { background: rgba(88, 196, 221, .13); border-left-color: var(--blue); }
.code .ln.active::before { color: var(--blue); }
.code .ln.done { background: rgba(131, 193, 103, .10); border-left-color: var(--green); }
.tk-kw { color: #c792ea; }
.tk-ty { color: var(--blue); }
.tk-fn { color: var(--yellow); }
.tk-num { color: var(--orange); }
.tk-str { color: var(--green); }
.tk-com { color: var(--faint); font-style: italic; }
.tk-pp { color: var(--pink); }

.narration .msg { padding: 6px 14px 14px; min-height: 64px; color: #d9dde3; }
.narration .msg b, .narration .msg strong { color: var(--yellow); font-weight: 600; }
.narration .step-no { font-family: var(--mono); font-size: 12px; color: var(--faint); }

table.vars { width: 100%; border-collapse: collapse; font-family: var(--mono); font-size: 13px; }
table.vars td { padding: 4px 14px; border-top: 1px solid var(--border); }
table.vars td:first-child { color: var(--muted); width: 40%; }
table.vars td.changed { color: var(--yellow); animation: flash .6s ease-out; }
table.vars tr:first-child td { border-top: 0; }
@keyframes flash { from { background: rgba(244, 211, 94, .25); } to { background: transparent; } }
.empty { color: var(--faint); font-style: italic; padding: 4px 14px 10px; font-size: 13px; }

/* ---------- Cena SVG animada ---------- */
svg.scene { font-family: var(--font); user-select: none; }
svg.scene .sn {
  transition:
    transform var(--dur) var(--ease),
    opacity var(--dur) var(--ease),
    fill var(--dur) var(--ease),
    stroke var(--dur) var(--ease),
    d var(--dur) var(--ease);
}
svg.scene.no-anim .sn { transition: none !important; }
svg.scene text { dominant-baseline: central; }
svg.scene .mono { font-family: var(--mono); font-variant-ligatures: none; }

/* ---------- Tabelas genéricas ---------- */
.table-wrap { overflow-x: auto; border: 1px solid var(--border); border-radius: var(--radius); }
table.data { border-collapse: collapse; width: 100%; font-family: var(--mono); font-size: 14px; }
table.data th, table.data td { padding: 6px 12px; text-align: center; border-bottom: 1px solid var(--border); white-space: nowrap; }
/* em texto corrido, tabelas quebram linha em vez de vazar da página */
.prose table.data th, .prose table.data td { white-space: normal; }
table.data th { background: var(--surface-2); color: var(--muted); font-weight: 600; position: sticky; top: 0; }
table.data td.t { color: var(--green); }
table.data td.f { color: var(--red); }
table.data tr.active td { background: rgba(88, 196, 221, .12); }
table.data td.hot { outline: 2px solid var(--yellow); outline-offset: -2px; }

/* ---------- Exercícios ---------- */
.quiz { display: grid; gap: 14px; }
.q-card { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 16px 18px; }
.q-card .q { font-weight: 500; margin-bottom: 12px; }
.q-card .opts { display: grid; gap: 8px; }
.q-card .opt {
  text-align: left; background: var(--surface-2); border: 1px solid var(--border);
  color: var(--text); padding: 9px 12px; border-radius: 8px; font: inherit; cursor: pointer;
}
.q-card .opt:hover:not(:disabled) { border-color: var(--blue); }
.q-card .opt.right { border-color: var(--green); background: rgba(131, 193, 103, .12); }
.q-card .opt.wrong { border-color: var(--red); background: rgba(252, 98, 85, .12); }
.q-card .opt:disabled { cursor: default; }
.q-card .row { display: flex; gap: 8px; flex-wrap: wrap; }
.q-card .feedback { margin-top: 12px; color: var(--muted); font-size: 15px; }
.q-card .feedback.ok b { color: var(--green); }
.q-card .feedback.bad b { color: var(--red); }
.q-head { display: flex; align-items: center; justify-content: space-between; gap: 12px; margin-bottom: 8px; }
.score { font-family: var(--mono); color: var(--muted); font-size: 13px; }

/* ---------- Cartões (índices) ---------- */
.grid-cards { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 14px; }
.card {
  display: block; background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 16px 18px; color: var(--text); transition: border-color .15s, transform .15s;
}
a.card:hover { border-color: var(--blue); transform: translateY(-2px); text-decoration: none; }
.card h3 { margin: 0 0 6px; font-size: 17px; }
.card p { margin: 0; color: var(--muted); font-size: 14px; }
.badge {
  display: inline-block; font-size: 11px; font-weight: 600; letter-spacing: .04em;
  padding: 2px 8px; border-radius: 999px; border: 1px solid var(--border); color: var(--muted);
}
.badge.ok { color: var(--green); border-color: rgba(131, 193, 103, .4); }
.badge.bad { color: var(--red); border-color: rgba(252, 98, 85, .4); }
.badge.warn { color: var(--yellow); border-color: rgba(244, 211, 94, .4); }
.badge.info { color: var(--blue); border-color: rgba(88, 196, 221, .4); }

.legend { display: flex; flex-wrap: wrap; gap: 14px; font-size: 13px; color: var(--muted); margin: 8px 2px; }
.legend i { display: inline-block; width: 10px; height: 10px; border-radius: 3px; margin-right: 6px; vertical-align: middle; }

.footer { color: var(--faint); font-size: 13px; border-top: 1px solid var(--border); margin-top: 64px; padding-top: 20px; }

/* ---------- Tutoriais: blocos de código e sumário ---------- */
pre.codeblock {
  position: relative; margin: 14px 0; padding: 14px 16px; overflow-x: auto;
  background: var(--surface); border: 1px solid var(--border); border-radius: 10px;
  font-size: 13.5px; line-height: 1.6;
}
pre.codeblock .cb-file {
  margin: -14px -16px 10px; padding: 6px 16px; font: 600 12px var(--mono); color: var(--muted);
  background: var(--surface-2); border-bottom: 1px solid var(--border); border-radius: 10px 10px 0 0;
}
pre.codeblock .cb-copy {
  position: absolute; top: 8px; right: 8px; opacity: 0; transition: opacity .15s;
  background: var(--surface-3); color: var(--muted); border: 1px solid var(--border);
  border-radius: 6px; font: 12px var(--font); padding: 3px 8px; cursor: pointer;
}
pre.codeblock:hover .cb-copy { opacity: 1; }
.with-toc { display: grid; grid-template-columns: 220px minmax(0, 1fr); gap: 40px; align-items: start; }
.toc { position: sticky; top: 72px; display: flex; flex-direction: column; gap: 2px; font-size: 14px; }
.toc .toc-title { font-size: 12px; font-weight: 600; letter-spacing: .08em; text-transform: uppercase; color: var(--muted); margin-bottom: 6px; }
.toc a { color: var(--muted); padding: 4px 10px; border-left: 2px solid var(--border); }
.toc a:hover { color: var(--text); text-decoration: none; }
.toc a.active { color: var(--blue); border-left-color: var(--blue); }
.step-list { counter-reset: passo; list-style: none; padding: 0; }
.step-list > li { counter-increment: passo; position: relative; padding-left: 44px; margin: 18px 0; }
.step-list > li::before {
  content: counter(passo); position: absolute; left: 0; top: 0;
  width: 30px; height: 30px; border-radius: 50%; display: grid; place-items: center;
  background: var(--blue); color: #0b1a20; font-weight: 700; font-size: 14px;
}

/* ---------- Responsivo ---------- */
@media (max-width: 980px) {
  .player { grid-template-columns: 1fr; }
  .code { max-height: 260px; }
}
@media (max-width: 600px) {
  .page { padding: 18px 16px 60px; }
  .topbar { padding: 10px 16px; }
  .controls .counter { display: none; }
}
@media (prefers-reduced-motion: reduce) {
  svg.scene .sn { transition: none !important; }
}