.studio-main{font-family:Inter,Arial,sans-serif}.studio-main h2,.studio-main h3{font-family:Inter,Arial,sans-serif;letter-spacing:-.02em}.studio-main h2{font-weight:700}.studio-main h3{font-weight:650}
.tri-grid,.theorem-grid,.comparison-grid,.review-grid{gap:0!important;margin:17px 0!important}.tri-grid>div,.theorem-grid>div,.comparison-grid>div,.review-grid>div{padding:12px 14px!important;border:0!important;border-bottom:1px solid #d9e8f7!important;border-radius:0!important;background:transparent!important;box-shadow:none!important}.tri-grid>div:nth-child(odd),.theorem-grid>div:nth-child(odd),.comparison-grid>div:nth-child(odd),.review-grid>div:nth-child(odd){padding-left:0!important}.tri-grid>div:nth-child(even),.theorem-grid>div:nth-child(even),.comparison-grid>div:nth-child(even),.review-grid>div:nth-child(even){padding-right:0!important}
.geometry-visual-card{margin:22px 0 8px!important;padding:0!important;border:0!important;border-radius:0!important;background:transparent!important;box-shadow:none!important;overflow:visible!important}.geometry-visual-card svg{max-width:100%;height:auto}.geometry-visual-card figcaption{padding:8px 0 2px;margin:0!important;text-align:left!important;color:#64748b!important;font-size:.83rem!important;line-height:1.5!important}.geometry-visual-card svg [stroke="#1769e0"]{stroke-width:3!important;vector-effect:non-scaling-stroke}.geometry-visual-card svg [stroke="#f4a900"],.geometry-visual-card svg [stroke="#f59e0b"]{stroke-width:3!important;vector-effect:non-scaling-stroke}.geometry-visual-card svg [stroke="#071943"]{stroke-width:2!important;vector-effect:non-scaling-stroke}.geometry-visual-card svg text{font-weight:650!important}
.hypothesis-banner{margin:18px 0!important;padding:13px 15px!important;border:0!important;border-left:3px solid #1769e0!important;border-radius:0 8px 8px 0!important;background:#f3f8fe!important;color:#173357!important;font-weight:500!important}.hypothesis-banner strong{color:#071943}
.worked-panel.power-steps{margin:18px 0!important;padding:18px 0!important;border:0!important;border-top:1px solid #d9e8f7!important;border-bottom:1px solid #d9e8f7!important;border-radius:0!important;background:transparent!important;box-shadow:none!important}.logic-strip{gap:0!important;border-top:1px solid #d9e8f7;border-bottom:1px solid #d9e8f7}.logic-strip span{padding:10px 14px!important;border:0!important;border-right:1px solid #d9e8f7!important;border-radius:0!important;background:transparent!important;color:#173357!important;font-weight:650!important}.logic-strip span:last-child{border-right:0!important}
.triangle-advanced-intro{margin:35px 0 10px;padding:20px 0 2px;border-top:2px solid #1769e0}.triangle-advanced-intro .advanced-label{display:inline-block;margin-bottom:8px;color:#075fc9;font-size:.78rem;font-weight:700;text-transform:uppercase;letter-spacing:.08em}.triangle-advanced-intro h2{margin:0 0 8px;color:#071943;font-size:1.35rem}.triangle-advanced-intro p{margin:0;color:#53627d;line-height:1.65}.advanced-note{margin:12px 0 20px;padding-left:13px;border-left:3px solid #e5a11a;color:#53627d;line-height:1.6}
.existence-proof{margin-top:28px;padding-top:24px;border-top:1px solid #d9e8f7}.existence-proof h3{margin-top:0}.existence-proof ol{counter-reset:tri-proof;margin:15px 0;padding:0;list-style:none}.existence-proof li{position:relative;padding:10px 0 10px 40px;border-bottom:1px solid #e0eaf4;line-height:1.58}.existence-proof li:before{counter-increment:tri-proof;content:counter(tri-proof);position:absolute;left:0;top:9px;width:25px;height:25px;display:grid;place-items:center;border:1px solid #a9caee;border-radius:50%;color:#075fc9;font-size:.78rem;font-weight:700}
#exercicios .exercise-grid{display:block}#exercicios .exercise-item{margin:0!important;padding:22px 2px!important;border:0!important;border-bottom:1px solid #d9e8f7!important;border-radius:0!important;background:transparent!important;box-shadow:none!important}#exercicios .exercise-options{display:grid!important;grid-template-columns:1fr!important;gap:7px!important}#exercicios .exercise-options span{padding:9px 12px!important;border:1px solid #d9e8f7!important;border-radius:7px!important;background:#f8fbff!important;font-weight:400!important;cursor:pointer}
html[data-theme="dark"] .tri-grid>div,html[data-theme="dark"] .theorem-grid>div,html[data-theme="dark"] .comparison-grid>div,html[data-theme="dark"] .review-grid>div,html[data-theme="dark"] .worked-panel.power-steps{border-color:#314766!important;background:transparent!important}html[data-theme="dark"] .hypothesis-banner{background:#122039!important;color:#dce8fb!important}html[data-theme="dark"] .hypothesis-banner strong,html[data-theme="dark"] .triangle-advanced-intro h2{color:#f2f6ff}html[data-theme="dark"] .logic-strip,html[data-theme="dark"] .logic-strip span,html[data-theme="dark"] .existence-proof,html[data-theme="dark"] .existence-proof li{border-color:#314766!important}html[data-theme="dark"] .logic-strip span{background:transparent!important;color:#dce8fb!important}html[data-theme="dark"] #exercicios .exercise-options span{background:#122039!important;border-color:#314766!important;color:#dce8fb!important}
@media(max-width:760px){.tri-grid,.theorem-grid,.comparison-grid,.review-grid{grid-template-columns:1fr!important}.tri-grid>div,.theorem-grid>div,.comparison-grid>div,.review-grid>div{padding:12px 0!important}.logic-strip{display:block!important}.logic-strip span{display:block;border-right:0!important;border-bottom:1px solid #d9e8f7!important}}


.studio-hero h1{font-family:Inter,Arial,sans-serif!important;font-weight:700!important;letter-spacing:-.035em!important}
.geometry-visual-card svg>rect:first-of-type{fill:transparent!important;stroke:none!important}
.method-grid,.trap-grid{display:block!important}.method-grid>li,.trap-grid>li{margin:0!important;padding:13px 0 13px 42px!important;border:0!important;border-bottom:1px solid #d9e8f7!important;border-radius:0!important;background:transparent!important;box-shadow:none!important}
#resolvidas .exercise-grid{display:block}#resolvidas .exercise-item{margin:0!important;padding:22px 2px!important;border:0!important;border-bottom:1px solid #d9e8f7!important;border-radius:0!important;background:transparent!important;box-shadow:none!important}
.two-columns{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:0;margin:18px 0}.two-columns>div{padding:0 22px}.two-columns>div:first-child{padding-left:0;border-right:1px solid #d9e8f7}.two-columns>div:last-child{padding-right:0}.two-columns h3{margin-top:0}.two-columns p{line-height:1.6}
html[data-theme="dark"] .method-grid>li,html[data-theme="dark"] .trap-grid>li,html[data-theme="dark"] #resolvidas .exercise-item,html[data-theme="dark"] .two-columns>div:first-child{border-color:#314766!important;background:transparent!important}
@media(max-width:760px){.two-columns{grid-template-columns:1fr}.two-columns>div,.two-columns>div:first-child,.two-columns>div:last-child{padding:15px 0;border-right:0;border-bottom:1px solid #d9e8f7}.two-columns>div:last-child{border-bottom:0}}


.studio-main .geometry-formula-strip{display:flex!important;flex-wrap:wrap!important;gap:10px 26px!important;margin:18px 0!important;padding:12px 0!important;border-top:1px solid #d9e8f7!important;border-bottom:1px solid #d9e8f7!important}.studio-main .geometry-formula-strip span{width:auto!important;padding:0!important;border:0!important;border-radius:0!important;background:transparent!important;color:#071943!important;font-family:var(--lesson-math-font) !important;font-size:1.05rem!important;font-weight:700!important;text-align:left!important;box-shadow:none!important}html[data-theme="dark"] .studio-main .geometry-formula-strip{border-color:#314766!important}html[data-theme="dark"] .studio-main .geometry-formula-strip span{color:#f2f6ff!important}



/* Mesmo ritmo didático da aula de Ângulos: um conceito por vez. */
.studio-main .tri-grid,.studio-main .theorem-grid,.studio-main .comparison-grid{display:block!important}
.studio-main .tri-grid>div,.studio-main .theorem-grid>div,.studio-main .comparison-grid>div{padding:14px 0!important}
.studio-main .study-card-body>h3,.studio-main .concept-sequence>section{margin-top:30px;padding-top:23px;border-top:1px solid #d9e8f7}
.studio-main .study-card-body>h2+h3,.studio-main .concept-sequence>section:first-child{margin-top:18px;padding-top:0;border-top:0}
.studio-main .concept-sequence h3{margin:0 0 10px;color:#071943;font-size:1.08rem;font-weight:650;line-height:1.35}
.studio-main .concept-sequence p{margin:8px 0!important;line-height:1.65!important}
.criterion-visual{margin:16px 0 5px;padding:0;border:0;background:transparent}.criterion-visual svg{display:block;width:100%;height:auto;max-height:230px}.criterion-visual figcaption{margin:6px 0 0;color:#64748b;font-size:.82rem;line-height:1.5;text-align:left}.criterion-visual svg text{font-family:Inter,"Segoe UI",sans-serif;font-weight:600}.criterion-visual .criterion-outline{fill:none;stroke:#1769e0;stroke-width:3;stroke-linejoin:round}.criterion-visual .criterion-mark{fill:none;stroke:#071943;stroke-width:2;stroke-linecap:round}.criterion-visual .criterion-angle{fill:none;stroke:#f4a900;stroke-width:3;stroke-linecap:round}html[data-theme="dark"] .criterion-visual svg text{fill:#f2f6ff!important}
.studio-main .concept-clue{padding-left:14px;border-left:3px solid #1769e0;color:#334767}
.studio-main .concept-memory{margin:25px 0!important;padding:15px 0;border-top:1px solid #d9e8f7;border-bottom:1px solid #d9e8f7}
html[data-theme="dark"] .studio-main .study-card-body>h3,html[data-theme="dark"] .studio-main .concept-sequence>section,html[data-theme="dark"] .studio-main .concept-memory{border-color:#314766}
html[data-theme="dark"] .studio-main .concept-sequence h3{color:#f2f6ff}
html[data-theme="dark"] .studio-main .concept-clue{color:#dce8fb}

/* Passos de interior e exterior, no padrão da aula de Ângulos. */
.logic-steps{counter-reset:tri-logic;margin:17px 0;padding:0;list-style:none}
.logic-steps li{position:relative;margin:0;padding:11px 0 11px 40px;border-bottom:1px solid #e0eaf4;line-height:1.62}
.logic-steps li:before{counter-increment:tri-logic;content:counter(tri-logic);position:absolute;left:0;top:10px;width:24px;height:24px;display:grid;place-items:center;border:1px solid #a9caee;border-radius:50%;color:#075fc9;font-size:.76rem;font-weight:700}
html[data-theme="dark"] .logic-steps li{border-color:#314766}

/* Fórmulas formais apresentadas somente após a explicação visual. */
.formula-line{margin:18px 0!important;padding:10px 0;border-top:1px solid #d9e8f7;border-bottom:1px solid #d9e8f7;text-align:center;font-family:var(--lesson-math-font);font-size:1.08rem;font-weight:700;color:#071943}
html[data-theme="dark"] .formula-line{border-color:#314766;color:#f2f6ff}

/* Nomes dos semiplanos do item 47, em linhas simples. */
.semiplane-list{margin:17px 0}
.semiplane-list>div{display:grid;grid-template-columns:135px 1fr;gap:18px;padding:12px 0;border-bottom:1px solid #d9e8f7}
.semiplane-list dt{color:#071943;font-weight:650}
.semiplane-list dd{margin:0;line-height:1.6}
html[data-theme="dark"] .semiplane-list>div{border-color:#314766}
html[data-theme="dark"] .semiplane-list dt{color:#f2f6ff}
@media(max-width:620px){.semiplane-list>div{grid-template-columns:1fr;gap:4px}}

/* Três posições possíveis de um ponto, sem cartões. */
.position-list{margin:15px 0 20px;border-top:1px solid #d9e8f7}
.position-list p{margin:0!important;padding:12px 0;border-bottom:1px solid #d9e8f7;line-height:1.62!important}
html[data-theme="dark"] .position-list,html[data-theme="dark"] .position-list p{border-color:#314766}

.lesson-module-page-link{ text-decoration:none; }
.lesson-module-link-arrow{ flex:0 0 auto; color:#61708a; font-size:1.2rem; font-weight:700; line-height:1; }

/* Mesmo comportamento das demais aulas: o cartão acompanha a leitura. */
@media (min-width: 1041px) {
  body.lesson-clean-model .lesson-anchor-nav .lesson-anchor-card {
    position: sticky !important;
    top: 88px !important;
    max-height: none !important;
    overflow: visible !important;
  }

  body.lesson-clean-model .lesson-anchor-nav .lesson-anchor-card.lesson-sidebar-fixed {
    position: fixed !important;
    top: 88px !important;
    left: var(--lesson-sidebar-fixed-left) !important;
    z-index: 6;
    width: var(--lesson-sidebar-fixed-width) !important;
    max-height: calc(100vh - 108px) !important;
    padding-right: 6px;
    overflow-y: auto !important;
    background: #fff;
  }
}

main .studio-main {
  transition: opacity .18s ease, transform .18s ease;
}

main.triangle-module-loading .studio-main {
  cursor: progress;
  opacity: .72;
}

main.triangle-module-switching .studio-main {
  opacity: 0;
  transform: translateY(5px);
}
/* Animação própria dos módulos, sem depender do paginador monolítico. */
.lesson-folder-links {
  max-height: 0;
  margin-top: 0;
  margin-bottom: 0;
  padding-top: 0;
  padding-bottom: 0;
  opacity: 0;
  overflow: hidden;
  visibility: hidden;
  transform: translateY(-5px);
  transition: max-height .3s cubic-bezier(.2,.72,.25,1), opacity .18s ease, transform .26s ease, margin .26s ease, padding .26s ease, visibility 0s linear .3s;
}

.lesson-folder.is-open .lesson-folder-links {
  max-height: 560px;
  margin: 4px 0 9px 11px;
  padding: 3px 0 3px 10px;
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
  transition-delay: 0s;
}

body.lesson-clean-model .studio-main {
  animation: triangulos-module-enter .22s ease-out both;
}

body.lesson-clean-model .lesson-motion {
  transition-duration: .28s;
}

@keyframes triangulos-module-enter {
  from { opacity: .82; transform: translateY(6px); }
  to { opacity: 1; transform: translateY(0); }
}

@view-transition {
  navigation: auto;
}

::view-transition-old(root) {
  animation-duration: .12s;
}

::view-transition-new(root) {
  animation-duration: .18s;
}

@media (prefers-reduced-motion: reduce) {
  .lesson-folder-links,
  body.lesson-clean-model .studio-main {
    animation: none !important;
    transition: none !important;
  }
}
body.lesson-clean-model .studio-bottom-nav.studio-bottom-nav--next-only {
  display: flex;
  justify-content: flex-end;
}

body.lesson-clean-model .studio-bottom-nav.studio-bottom-nav--next-only .button {
  width: auto;
  min-width: 168px;
}
/* Destaque progressivo do tópico que chegou à faixa de leitura. */
body.lesson-clean-model .lesson-anchor-link {
  transition: color .18s ease, background-color .18s ease;
}

body.lesson-clean-model .lesson-anchor-link::before {
  opacity: 0;
  transform: scaleY(.35);
  transform-origin: center;
  transition: opacity .18s ease, transform .2s ease, background-color .18s ease;
}

body.lesson-clean-model .lesson-anchor-link.active::before,
body.lesson-clean-model .lesson-anchor-link[aria-current="location"]::before {
  opacity: 1;
  transform: scaleY(1);
}

/* triangulos-topic-highlight */
/* CEVIANAS:BEGIN — diagramas separados e leitura sem cartões. */
.cevian-visual{margin:22px 0 8px;padding:0;border:0;background:transparent}
.cevian-visual svg{display:block;width:min(100%,780px)!important;max-height:none!important;height:auto!important;margin:0 auto;overflow:visible}
.cevian-visual--wide svg{width:100%!important;max-width:900px!important}
.cevian-visual figcaption{margin:8px 0 0;color:#64748b;font-size:.84rem;line-height:1.55;text-align:left}
.cevian-visual .criterion-outline{fill:none;stroke:#1769e0;stroke-width:3;stroke-linecap:round;stroke-linejoin:round;vector-effect:non-scaling-stroke}
.cevian-visual .criterion-emphasis{fill:none;stroke:#0f9f8f;stroke-width:3;stroke-linecap:round;vector-effect:non-scaling-stroke}
.cevian-visual .criterion-extension{fill:none;stroke:#1769e0;stroke-width:2;stroke-dasharray:7 6;vector-effect:non-scaling-stroke}
.cevian-visual .criterion-mark{fill:none;stroke:#071943;stroke-width:2;stroke-linecap:round;vector-effect:non-scaling-stroke}
.cevian-visual .criterion-angle{fill:none;stroke:#f4a321;stroke-width:3;stroke-linecap:round;vector-effect:non-scaling-stroke}
.cevian-visual .criterion-point{fill:#f4a321;stroke:#071943;stroke-width:2;vector-effect:non-scaling-stroke}
.cevian-visual .criterion-divider{stroke:#d9e8f7;stroke-width:2;vector-effect:non-scaling-stroke}
.cevian-visual .criterion-label text{fill:#071943;font-family:Inter,"Segoe UI",sans-serif;font-size:18px;font-weight:650}
.cevian-comparison{margin:18px 0;border-top:1px solid #d9e8f7}
.cevian-comparison>div{display:grid;grid-template-columns:165px 190px minmax(0,1fr);gap:16px;padding:13px 0;border-bottom:1px solid #d9e8f7;line-height:1.55}
.cevian-comparison strong{color:#071943}
.cevian-comparison .cevian-comparison-head{padding:9px 0;color:#64748b;font-size:.78rem;font-weight:700;letter-spacing:.04em;text-transform:uppercase}
html[data-theme="dark"] .cevian-visual .criterion-label text{fill:#f2f6ff}
html[data-theme="dark"] .cevian-visual .criterion-mark{stroke:#f2f6ff}
html[data-theme="dark"] .cevian-visual .criterion-divider,html[data-theme="dark"] .cevian-comparison,html[data-theme="dark"] .cevian-comparison>div{border-color:#314766}
html[data-theme="dark"] .cevian-comparison strong{color:#f2f6ff}
@media(max-width:700px){
  .cevian-comparison>div{grid-template-columns:1fr;gap:3px}
  .cevian-visual .criterion-label text{font-size:16px}
}
/* CEVIANAS:END */
/* PONTOS-NOTAVEIS-CEVIANAS:BEGIN */
.notable-theorem{margin:30px 0 6px;padding-top:24px;border-top:1px solid #d9e8f7}
.notable-theorem h3{margin:0 0 10px;color:#071943;font-size:1.16rem;font-weight:650}
.notable-theorem p{line-height:1.68}
.theorem-reading{display:flex;flex-wrap:wrap;gap:0;margin:16px 0;border-top:1px solid #d9e8f7;border-bottom:1px solid #d9e8f7}
.theorem-reading>*{padding:11px 16px;border-right:1px solid #d9e8f7}
.theorem-reading>*:first-child{padding-left:0}
.theorem-reading>*:last-child{border-right:0}
.notable-visual{margin-top:18px}.notable-visual svg{display:block;width:min(100%,780px)!important;max-height:none!important;height:auto!important;margin:0 auto}
.notable-visual .notable-line{fill:none;stroke:#0f9f8f;stroke-width:2.6;stroke-linecap:round;vector-effect:non-scaling-stroke}
.notable-visual .criterion-point-set circle{fill:#f4a321;stroke:#071943;stroke-width:1.6}
.notable-visual .notable-center{fill:#f4a321;stroke:#071943;stroke-width:2;vector-effect:non-scaling-stroke}
.notable-visual .inscribed-circle{fill:rgba(244,163,33,.07);stroke:#f4a321;stroke-width:2.5;vector-effect:non-scaling-stroke}
.notable-visual .right-angle-set{fill:none;stroke:#f4a321;stroke-width:2;vector-effect:non-scaling-stroke}
.notable-visual .mediatrix-lines{fill:none;stroke:#0f9f8f;stroke-width:2.2;stroke-dasharray:8 6;vector-effect:non-scaling-stroke}
.notable-visual .radius-lines{fill:none;stroke:#f4a321;stroke-width:2.2;vector-effect:non-scaling-stroke}
html[data-theme="dark"] .notable-theorem,html[data-theme="dark"] .theorem-reading,html[data-theme="dark"] .theorem-reading>*{border-color:#314766}
html[data-theme="dark"] .notable-theorem h3{color:#f2f6ff}
@media(max-width:700px){.theorem-reading{display:block}.theorem-reading>*{display:block;padding:8px 0;border-right:0;border-bottom:1px solid #d9e8f7}.theorem-reading>*:last-child{border-bottom:0}}
/* PONTOS-NOTAVEIS-CEVIANAS:END */
/* DEFINICOES-DIDATICAS:BEGIN */
.formal-definition{margin:12px 0!important;padding:0!important;border:0!important;background:transparent!important;color:#334767;line-height:1.68}
.formal-definition strong:first-child{color:#071943}
html[data-theme="dark"] .formal-definition{color:#dce8fb}
html[data-theme="dark"] .formal-definition strong:first-child{color:#f2f6ff}
/* DEFINICOES-DIDATICAS:END */