/* ==========================================================================
   quantum-edu — folha de estilo única
   Mesma linguagem do sorteio-quantico: tema escuro comprometido, estética de
   laboratório/espaço profundo. Cores de série de dados validadas para CVD e
   contraste sobre --bg-elev (ver web/viz.js): medido #14a898, ideal #8b6cf6.
   ========================================================================== */

:root {
  --bg:        #06070d;
  --bg-elev:   #0d0f1a;
  --bg-elev-2: #141728;
  --line:      #232741;
  --line-soft: #1a1d31;

  --text:       #e8eaf6;
  --text-dim:   #9aa0c0;
  --text-faint: #666d90;

  --cyan:   #35e6d4;
  --violet: #8b6cf6;
  --pink:   #f062a6;
  --amber:  #ffb454;
  --green:  #4ade80;
  --red:    #ff6b7a;

  --serie-med:   #14a898;
  --serie-ideal: #8b6cf6;

  --grad: linear-gradient(115deg, var(--cyan) 0%, var(--violet) 55%, var(--pink) 100%);

  --radius:    16px;
  --radius-sm: 10px;
  --shadow: 0 20px 60px -20px rgba(0, 0, 0, .85);

  --mono: ui-monospace, "SF Mono", "JetBrains Mono", "Fira Code", Menlo, Consolas, monospace;
  --sans: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial,
          "Noto Sans", "Noto Sans Arabic", "Noto Sans Devanagari", "Noto Sans SC", sans-serif;

  --maxw: 1060px;
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

a { color: var(--cyan); text-decoration: none; }
a:hover { text-decoration: underline; }
/* Fórmulas, k/M e ids de job ficam LTR mesmo em árabe — senão o navegador
   embaralha visualmente os dígitos e os operadores. */
.mono { font-family: var(--mono); direction: ltr; unicode-bidi: embed; }
.math { direction: ltr; unicode-bidi: embed; }

[dir="rtl"] .chap-n { margin-right: 0; margin-left: 10px; }
[dir="rtl"] figcaption, [dir="rtl"] .fine { text-align: right; }
[dir="rtl"] .data-tbl th, [dir="rtl"] .data-tbl td { text-align: right; }

.lang-sel {
  background: var(--bg-elev-2); color: var(--text);
  border: 1px solid var(--line); border-radius: 8px;
  font-size: 13px; padding: 5px 8px; cursor: pointer;
}
.hidden { display: none !important; }
.center { text-align: center; }

/* ------------------------------------------------------------------ topo */
.top {
  position: sticky; top: 0; z-index: 50;
  background: rgba(6, 7, 13, .82);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line-soft);
}
.nav {
  max-width: var(--maxw); margin: 0 auto; padding: 10px 20px;
  display: flex; align-items: center; gap: 18px;
}
.brand { color: var(--text); font-size: 15px; white-space: nowrap; }
.brand:hover { text-decoration: none; }
.nav-links { display: flex; gap: 14px; flex-wrap: wrap; flex: 1; }
.nav-links a { color: var(--text-dim); font-size: 13.5px; }
.nav-links a:hover { color: var(--text); text-decoration: none; }
.nav-sib { font-size: 13px; color: var(--violet); white-space: nowrap; }
@media (max-width: 760px) { .nav-links { display: none; } }

/* ------------------------------------------------------------------ hero */
.hero {
  max-width: var(--maxw); margin: 0 auto;
  padding: 84px 20px 40px; text-align: center;
}
.hero h1 {
  font-size: clamp(40px, 7vw, 72px);
  line-height: 1.05; margin: 0 0 22px; letter-spacing: -.02em;
}
.grad { background: var(--grad); -webkit-background-clip: text; background-clip: text; color: transparent; }
.lead { max-width: 760px; margin: 0 auto 28px; color: var(--text-dim); font-size: 18px; }
.hero-cta { display: flex; gap: 14px; justify-content: center; flex-wrap: wrap; }
.hero-note { color: var(--text-faint); font-size: 13.5px; margin-top: 26px; }

/* ------------------------------------------------------------------ capítulos */
.chapter {
  max-width: var(--maxw); margin: 0 auto;
  padding: 56px 20px 8px;
}
.chapter h2 {
  font-size: clamp(24px, 3.6vw, 34px);
  letter-spacing: -.01em; margin: 0 0 18px;
}
.chap-n {
  display: inline-flex; align-items: center; justify-content: center;
  width: 40px; height: 40px; margin-right: 10px;
  border-radius: 12px; background: var(--bg-elev-2);
  border: 1px solid var(--line);
  color: var(--cyan); font-size: 20px; vertical-align: -6px;
}
.chapter-lead { color: var(--text-dim); max-width: 820px; margin: 0 0 22px; }

.cols {
  display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: 28px; align-items: start;
}
@media (max-width: 860px) { .cols { grid-template-columns: 1fr; } }

.panel {
  background: var(--bg-elev);
  border: 1px solid var(--line-soft);
  border-radius: var(--radius);
  padding: 18px;
  box-shadow: var(--shadow);
}
figure.panel { margin: 0; }
figcaption { color: var(--text-faint); font-size: 12.5px; margin-top: 10px; }

.prose { max-width: 860px; }
.prose h3 { margin-top: 0; }
.fine { color: var(--text-dim); font-size: 13.5px; }
.err { color: var(--red); font-size: 13.5px; }
.math { font-family: var(--mono); color: var(--amber); font-size: .92em; }

.big-read { font-size: 22px; margin: 14px 0 8px; }
.dim-note { color: var(--pink); font-size: 15px; }

/* ------------------------------------------------------------------ controles */
.btn {
  display: inline-block; padding: 10px 22px;
  border-radius: 999px; border: 1px solid transparent;
  background: var(--grad); color: #06070d; font-weight: 600;
  font-size: 15px; cursor: pointer; text-decoration: none;
}
.btn:hover { filter: brightness(1.12); text-decoration: none; }
.btn.ghost {
  background: transparent; color: var(--text);
  border-color: var(--line);
}
.btn.ghost:hover { border-color: var(--text-faint); filter: none; }
.btn.small { padding: 7px 16px; font-size: 13.5px; }
.btn.tiny { padding: 4px 12px; font-size: 12.5px; }
.btn:disabled { opacity: .4; cursor: default; filter: none; }

.controls {
  display: flex; align-items: center; gap: 12px;
  flex-wrap: wrap; margin: 16px 0 6px;
}
.grow { flex: 1; min-width: 140px; }

.state-chip {
  background: var(--bg-elev-2); border: 1px solid var(--line);
  border-radius: 8px; padding: 4px 12px; font-size: 13px; color: var(--cyan);
}

.slider { accent-color: var(--violet); height: 26px; }

.num {
  background: var(--bg-elev-2); color: var(--text);
  border: 1px solid var(--line); border-radius: var(--radius-sm);
  font-family: var(--mono); font-size: 15px; padding: 8px 12px;
  width: 90px;
}
select.num { width: auto; }

/* ------------------------------------------------------------------ gráficos */
.viz { display: block; width: 100%; height: 220px; }
.viz.tall { height: 280px; }
.viz.square { width: 240px; height: 240px; flex: none; }
canvas.viz { cursor: crosshair; }

.legend { display: flex; flex-wrap: wrap; gap: 14px; margin: 4px 0 10px; font-size: 12.5px; color: var(--text-dim); align-items: center; }
.lg-item { display: inline-flex; align-items: center; gap: 6px; }
.sw { display: inline-block; }
.sw-bar { width: 10px; height: 12px; border-radius: 2px 2px 0 0; }
.sw-dash { width: 14px; height: 3px; border-radius: 2px; }

.tooltip {
  position: fixed; z-index: 90; pointer-events: none;
  background: var(--bg-elev-2); border: 1px solid var(--line);
  border-radius: var(--radius-sm); padding: 8px 12px;
  font-size: 12.5px; font-family: var(--mono); color: var(--text);
  box-shadow: var(--shadow); max-width: 320px;
}

.tbl-details { margin-top: 10px; font-size: 13px; }
.tbl-details summary { color: var(--text-faint); cursor: pointer; }
.data-tbl {
  border-collapse: collapse; margin-top: 8px; font-family: var(--mono);
  font-size: 12.5px; width: 100%; max-height: 300px;
}
.data-tbl th, .data-tbl td {
  border: 1px solid var(--line-soft); padding: 4px 10px; text-align: left;
  color: var(--text-dim);
}
.data-tbl th { color: var(--text); background: var(--bg-elev-2); }
.tbl-details[open] > div { max-height: 320px; overflow: auto; display: block; }

/* ------------------------------------------------------------------ simulador */
.wide { max-width: var(--maxw); }
.sim-controls {
  display: flex; align-items: center; gap: 12px; flex-wrap: wrap;
  margin-bottom: 20px;
}
.sim-controls label { color: var(--text-dim); font-size: 14px; }
.presets { display: flex; gap: 6px; flex-wrap: wrap; }

.circuit-box { margin: 14px 0; overflow-x: auto; }
.circuit { width: 100%; max-width: 720px; margin: 0 auto; display: block; }

.c-wire  { stroke: var(--line); stroke-width: 1.5; fill: none; }
.c-gate  { fill: var(--bg-elev-2); stroke: var(--text-faint); stroke-width: 1.2; rx: 6; }
.c-gate-t { fill: var(--text); font: 600 15px var(--mono); text-anchor: middle; }
.c-gate-small { font-size: 12px; }
.c-label { fill: var(--text-dim); font: 13px var(--mono); }
.c-small { fill: var(--text-faint); font: 10px var(--sans); text-anchor: start; }
.c-dot   { fill: var(--text-dim); }
.c-meter { stroke: var(--text-dim); stroke-width: 1.4; fill: none; }
.c-stage.c-active .c-gate  { stroke: var(--cyan); stroke-width: 2; }
.c-stage.c-active .c-gate-t, .c-stage.c-active .c-label { fill: var(--cyan); }
.c-stage.c-active .c-dot { fill: var(--cyan); }
.c-stage.c-active .c-meter { stroke: var(--cyan); }

.steps { display: flex; gap: 8px; flex-wrap: wrap; margin: 18px 0 12px; }
.step-btn {
  flex: 1; min-width: 150px;
  background: var(--bg-elev); color: var(--text-dim);
  border: 1px solid var(--line-soft); border-radius: var(--radius-sm);
  padding: 10px 12px; font-size: 13.5px; cursor: pointer;
}
.step-btn:hover { color: var(--text); }
.step-btn.active {
  color: var(--cyan); border-color: var(--cyan);
  background: var(--bg-elev-2);
}

.step-panel { margin-bottom: 26px; }
#sim-text p { margin-top: 0; }

.phasor-row { display: flex; gap: 18px; align-items: center; flex-wrap: wrap; }
.phasor-row .fine { flex: 1; min-width: 220px; }

.step-nav { justify-content: space-between; margin-top: 18px; }

.verdict {
  border-radius: var(--radius-sm);
  padding: 20px 24px; margin: 16px 0 10px;
}
.verdict-ok { background: rgba(74, 222, 128, .08); border: 1px solid rgba(74, 222, 128, .35); }
.verdict-bad { background: rgba(255, 180, 84, .07); border: 1px solid rgba(255, 180, 84, .3); }
.v-big { font-family: var(--mono); font-weight: 700; letter-spacing: -.01em; direction: ltr; unicode-bidi: embed; }
.verdict-ok .v-big { color: var(--green); font-size: clamp(30px, 5vw, 46px); }
.verdict-bad .v-big { color: var(--amber); font-size: 22px; }
.v-sub { color: var(--text-dim); margin-top: 8px; font-size: 14.5px; }

details.how { margin: 8px 0 4px; font-size: 13.5px; color: var(--text-dim); }
details.how summary { cursor: pointer; color: var(--text-faint); }
details.how h4 { margin: 12px 0 4px; color: var(--text-dim); font-weight: 600; }

.int-verdict { margin: 0 0 6px; font-size: 13px; color: var(--text-dim); }
.int-verdict b { font-size: 24px; margin: 0 2px; }
.v-strong { color: var(--cyan); }
.v-mid { color: var(--amber); }
.v-dead { color: var(--red); }

/* ------------------------------------------------------------------ hardware */
#hw-cards { display: grid; gap: 22px; margin: 22px 0; }
.hw-card .viz { height: 200px; }
.hw-head { display: flex; align-items: baseline; gap: 12px; flex-wrap: wrap; }
.hw-head h3 { margin: 0; font-size: 19px; }
.hw-stats { color: var(--text-dim); font-size: 12.5px; }
.chip {
  font-size: 11.5px; padding: 2px 10px; border-radius: 999px;
  border: 1px solid var(--violet); color: var(--violet);
  text-transform: uppercase; letter-spacing: .06em;
}
.chip-warn { border-color: var(--amber); color: var(--amber); }

.hw-verdict {
  margin: 14px 0 4px; padding: 14px 18px;
  border-radius: var(--radius-sm);
}
.hw-verdict b { display: block; font-family: var(--mono); font-size: 24px; margin-bottom: 4px; }
.hw-verdict span { color: var(--text-dim); font-size: 13.5px; }
.hw-verdict.ok { background: rgba(74, 222, 128, .08); border: 1px solid rgba(74, 222, 128, .3); }
.hw-verdict.ok b { color: var(--green); }
.hw-verdict.bad { background: rgba(255, 180, 84, .07); border: 1px solid rgba(255, 180, 84, .3); }
.hw-verdict.bad b { color: var(--amber); }

/* ------------------------------------------------------------------ rodapé */
.foot {
  border-top: 1px solid var(--line-soft);
  margin-top: 72px; padding: 28px 20px 40px;
  text-align: center; color: var(--text-faint); font-size: 13.5px;
}