/* Layout: caderno de estudo — trilha fixa à esquerda, aula no centro com faixas de seção marcadas a "marca-texto" */
:root {
  --bg: #f6f5f1; --paper: #ffffff; --ink: #1d2433; --muted: #5d6475; --line: #e3e1d8; --soft: #efede6;
  --accent: #2b59c3; --accent-ink: #ffffff;
  --mat: #2b59c3; --bio: #7b3fb0; --qui: #0d7a57; --fis: #c2410c;
  --mat-soft: #e3ebfb; --bio-soft: #efe5f8; --qui-soft: #dff2ea; --fis-soft: #fbe8dd;
  --ok: #157f3b; --ok-soft: #e1f3e7; --bad: #b42318; --bad-soft: #fbe4e1; --hl: #fff2a8;
  --f-head: "Bricolage Grotesque", "Segoe UI", system-ui, sans-serif;
  --f-body: "Atkinson Hyperlegible", "Segoe UI", system-ui, sans-serif;
  --f-mono: "JetBrains Mono", ui-monospace, Consolas, monospace;
}
@media (prefers-color-scheme: dark) { :root:not([data-theme="light"]) {
  --bg: #12151c; --paper: #1a1e28; --ink: #e8eaf0; --muted: #a1a8b8; --line: #2b3140; --soft: #222837;
  --accent: #7fa2ff; --accent-ink: #10131a;
  --mat: #86a7ff; --bio: #c79af0; --qui: #4fd1a0; --fis: #ff9a5c;
  --mat-soft: #1e2a47; --bio-soft: #2c2140; --qui-soft: #16332a; --fis-soft: #3a2418;
  --ok: #5fd38b; --ok-soft: #173325; --bad: #ff8a7a; --bad-soft: #3a1d1b; --hl: #5a4d12; color-scheme: dark } }
:root[data-theme="dark"] {
  --bg: #12151c; --paper: #1a1e28; --ink: #e8eaf0; --muted: #a1a8b8; --line: #2b3140; --soft: #222837;
  --accent: #7fa2ff; --accent-ink: #10131a;
  --mat: #86a7ff; --bio: #c79af0; --qui: #4fd1a0; --fis: #ff9a5c;
  --mat-soft: #1e2a47; --bio-soft: #2c2140; --qui-soft: #16332a; --fis-soft: #3a2418;
  --ok: #5fd38b; --ok-soft: #173325; --bad: #ff8a7a; --bad-soft: #3a1d1b; --hl: #5a4d12; color-scheme: dark }

* { box-sizing: border-box }
html, body { margin: 0 }
body { background: var(--bg); color: var(--ink); font: 17px/1.6 var(--f-body) }
a { color: var(--accent) }
button { font: inherit; color: inherit }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px }

/* visuais */
.viz { margin: 0 }
.viz figcaption { font-size: 14px; color: var(--muted); margin-top: 8px }
.viz-row { display: flex; flex-wrap: wrap; gap: 18px; align-items: flex-start }
.viz-row .grow { flex: 1 1 280px; min-width: 0 }
.tw { overflow-x: auto }
table.mini { border-collapse: collapse; width: 100%; font-size: 14.5px }
table.mini th, table.mini td { border-bottom: 1px solid var(--line); padding: 7px 9px; text-align: left; vertical-align: top }
table.mini th { font-size: 12.5px; text-transform: uppercase; letter-spacing: .05em; color: var(--muted) }
table.mini tr.hl td { background: var(--hl) }
table.check td:not(:first-child) { text-align: center; font-weight: 700 }
svg .shape { fill: var(--cs); stroke: var(--c); stroke-width: 2 }
svg .line, svg .axis { stroke: var(--muted); stroke-width: 1.5; fill: none }
svg .dash { stroke-dasharray: 4 4 }
svg .tick { fill: none; stroke: var(--c); stroke-width: 1.5 }
svg .lbl { fill: var(--ink); font: 13px var(--f-body) }
svg .lbl.big { font: 700 20px var(--f-head) }
svg .wave, svg .curve { fill: none; stroke: var(--c); stroke-width: 3 }
svg .curve.cat { stroke: var(--ok); stroke-dasharray: 6 4 }
svg .pts circle { fill: var(--c) }
svg .water { fill: var(--mat-soft); stroke: var(--mat); stroke-width: 1.5 }
svg .fat { fill: var(--hl); stroke: var(--muted) }
svg .el.zn { fill: var(--muted) } svg .el.cu { fill: var(--fis) }
svg .slice { fill: var(--soft); stroke: var(--paper); stroke-width: 2 }
svg .slice.on { fill: var(--c) }
svg .grid { stroke: var(--line); stroke-width: 1 }
svg .plot { fill: none; stroke: var(--c); stroke-width: 3 }
svg .pt { fill: var(--c) }
.stairs { display: flex; flex-wrap: wrap; gap: 4px; align-items: flex-end }
.stairs span { font: 700 15px var(--f-mono); background: var(--cs); color: var(--ink); padding: 8px 12px; border-radius: 6px }
.stairs span:nth-child(1) { margin-bottom: 36px } .stairs span:nth-child(2) { margin-bottom: 30px } .stairs span:nth-child(3) { margin-bottom: 24px }
.stairs span:nth-child(4) { margin-bottom: 18px } .stairs span:nth-child(5) { margin-bottom: 12px } .stairs span:nth-child(6) { margin-bottom: 6px }
.stairs .hl { background: var(--c); color: var(--paper) }
.fila { display: flex; gap: 8px; flex-wrap: wrap }
.fila span { width: 46px; height: 46px; display: grid; place-items: center; border-radius: 10px; background: var(--soft); font: 700 18px var(--f-mono) }
.fila .hl { background: var(--c); color: var(--paper) }
.tree { display: flex; flex-wrap: wrap; align-items: center; gap: 10px }
.tcol { display: grid; gap: 6px }
.node { background: var(--cs); padding: 6px 10px; border-radius: 6px; font-size: 14px }
.node.big { font-weight: 700; font-size: 16px }
.tarrow { color: var(--muted); font-size: 14px }
.cidade, .cards3 { display: grid; grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); gap: 8px }
.cidade div, .cards3 div { background: var(--cs); border-radius: 10px; padding: 10px 12px; display: grid; gap: 2px }
.cidade span, .cards3 span { font-size: 14px }
.cards3 small { color: var(--muted); font-size: 13px }
.ciclo { display: flex; flex-wrap: wrap; align-items: center; gap: 12px }
.ciclo .box { flex: 1 1 220px; background: var(--cs); border-radius: 10px; padding: 12px; display: grid; gap: 2px }
.ciclo small { font-family: var(--f-mono); font-size: 13px }
.ciclo .arrows { font-size: 30px; color: var(--c) }
.steps { display: flex; flex-wrap: wrap; gap: 8px; counter-reset: s }
.steps span { flex: 1 1 160px; background: var(--cs); border-radius: 10px; padding: 10px 12px; font-size: 14.5px }
.steps small { color: var(--muted) }
.gangorra { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 8px; margin-top: 8px }
.gangorra span { background: var(--soft); border-radius: 8px; padding: 8px 10px; font-size: 14.5px }
table.punnett { border-collapse: collapse; font: 700 18px var(--f-mono) }
table.punnett th, table.punnett td { width: 64px; height: 52px; text-align: center; border: 2px solid var(--line) }
table.punnett th { color: var(--c) }
table.punnett td.hl { background: var(--c); color: var(--paper) }
.selecao { display: flex; flex-wrap: wrap; align-items: center; gap: 14px }
.dots { display: flex; gap: 6px; margin: 6px 0 0 }
.dots i { width: 18px; height: 18px; border-radius: 50%; display: block }
.dots .d1 { background: var(--soft); border: 2px solid var(--muted) } .dots .d2 { background: var(--c) }
.cadeia { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; margin-bottom: 14px }
.cadeia span { background: var(--cs); border-radius: 10px; padding: 8px 12px; font-weight: 700; display: grid }
.cadeia small { font: 500 12.5px var(--f-mono); color: var(--muted) }
.cadeia b { color: var(--c) }
.meiavida { display: flex; gap: 10px; align-items: flex-end; height: 150px }
.meiavida span { flex: 1; height: var(--h); min-height: 22px; background: var(--c); color: var(--paper); border-radius: 6px 6px 0 0; display: flex; align-items: flex-start; justify-content: center; font: 600 12.5px/1.8 var(--f-mono) }
.ph .phbar { height: 22px; border-radius: 11px; background: linear-gradient(90deg, #d7263d, #f46036, #f6ae2d, #9bc53d, #2e86ab, #5b5ea6, #6a2c70) }
.ph .phlbl { display: flex; justify-content: space-between; font: 600 13px var(--f-mono); margin-top: 4px }
.ph .phex { position: relative; height: 54px; font-size: 12.5px }
.ph .phex span { position: absolute; transform: translateX(-50%); white-space: nowrap; top: 4px }
.ph .phex span:nth-child(even) { top: 28px }
.copos { display: flex; align-items: center; gap: 14px; flex-wrap: wrap }
.copo { border: 2px solid var(--muted); border-top: 0; border-radius: 0 0 10px 10px; background: var(--mat-soft); display: flex; flex-wrap: wrap; align-content: flex-end; gap: 6px; padding: 8px }
.copo.c1 { width: 70px; height: 70px } .copo.c2 { width: 90px; height: 130px; align-content: space-around; justify-content: space-around }
.copo i { width: 10px; height: 10px; background: var(--c); border-radius: 50% }
.colar { display: flex; flex-wrap: wrap; align-items: center }
.colar i { width: 30px; height: 30px; border-radius: 50%; background: var(--c); border: 3px solid var(--paper); margin-right: -6px; box-shadow: 0 0 0 2px var(--cs) }
.energia { display: grid; gap: 10px }
.energia > div { display: grid; grid-template-columns: 80px 1fr; gap: 4px 10px; align-items: center }
.energia b { grid-row: span 2; font-size: 14px }
.energia .bar { display: block; width: var(--w); min-width: 6px; white-space: nowrap; font-size: 12.5px; padding: 2px 6px; border-radius: 4px; color: var(--paper); overflow: visible }
.energia .ep { background: var(--mat) } .energia .ec { background: var(--fis) }

/* widgets */
.widget { display: grid; gap: 12px }
.wrow { display: flex; flex-wrap: wrap; gap: 10px 16px; align-items: flex-end }
.wrow label { display: grid; gap: 4px; font-size: 14px; color: var(--muted) }
.wrow input[type="number"], .wrow select { width: 120px; font: 600 16px var(--f-mono); padding: 7px 9px; border-radius: 8px; border: 1px solid var(--line); background: var(--bg); color: var(--ink) }
.wrow input[type="range"] { width: 180px; accent-color: var(--c) }
.wout { font: 600 16px/1.5 var(--f-mono); background: var(--cs); border-radius: 10px; padding: 12px 14px }
.wout b { font-size: 20px }
.grade6 { display: grid; grid-template-columns: 34px repeat(6, 38px); gap: 3px; font: 600 13px var(--f-mono) }
.grade6 span { height: 34px; display: grid; place-items: center; border-radius: 6px; background: var(--soft) }
.grade6 .h { background: transparent; color: var(--muted) }
.grade6 .on { background: var(--c); color: var(--paper) }
.somas { display: flex; flex-wrap: wrap; gap: 4px }
.somas button { width: 38px; height: 34px; border: 1px solid var(--line); background: var(--paper); border-radius: 6px; cursor: pointer; font: 600 14px var(--f-mono) }
.somas button[aria-pressed="true"] { background: var(--c); color: var(--paper); border-color: transparent }
.barras { display: flex; align-items: flex-end; gap: 4px; height: 140px; border-bottom: 1px solid var(--line) }
.barras i { flex: 1; background: var(--c); border-radius: 4px 4px 0 0; min-height: 2px; transition: height .25s }