/* ============================================================
   Cadernos Pedagógicos PNEEI — Design System do Leitor
   Portal T21 · v2.0
   ============================================================ */

:root{
  --bg-body:#f6f8fb; --bg-card:#ffffff; --bg-sidebar:#ffffff; --bg-elev:#ffffff;
  --text-main:#1e293b; --text-muted:#64748b;
  --primary:#0284c7; --primary-light:#e0f2fe; --primary-ink:#075985;
  --accent:#f59e0b; --accent-soft:#fef3c7;
  --border-color:#e2e8f0; --border-strong:#cbd5e1;
  --callout-bg:#f0fdf4; --callout-border:#22c55e;
  --ok:#16a34a; --warn:#d97706; --info:#0284c7; --story:#db2777; --purple:#7c3aed;
  --shadow-sm:0 1px 2px rgba(15,23,42,.06);
  --shadow-md:0 4px 12px rgba(15,23,42,.08);
  --shadow-lg:0 12px 32px rgba(15,23,42,.14);
  --font-main:'Lora',Georgia,'Times New Roman',serif;
  --font-ui:'Fira Sans',system-ui,-apple-system,'Segoe UI',sans-serif;
  --font-size:1.125rem; --line-height:1.8; --letter-spacing:normal;
  --radius:14px; --measure:74ch;
}
body.dark-mode{
  --bg-body:#0b1220; --bg-card:#161f31; --bg-sidebar:#111a29; --bg-elev:#1c2740;
  --text-main:#e8eef7; --text-muted:#9db0c9;
  --primary:#38bdf8; --primary-light:#0c3d5c; --primary-ink:#bae6fd;
  --accent:#fbbf24; --accent-soft:#4a3105;
  --border-color:#28344a; --border-strong:#3b4a66;
  --callout-bg:#062d23; --callout-border:#10b981;
  --ok:#34d399; --warn:#fbbf24; --info:#38bdf8; --story:#f472b6; --purple:#a78bfa;
  --shadow-sm:0 1px 2px rgba(0,0,0,.4);
  --shadow-md:0 4px 12px rgba(0,0,0,.45);
  --shadow-lg:0 12px 32px rgba(0,0,0,.55);
}
body.sepia-mode{
  --bg-body:#fbf0d9; --bg-card:#f6eeda; --bg-sidebar:#f2e8d1; --bg-elev:#f6eeda;
  --text-main:#41321f; --text-muted:#7a6852;
  --primary:#96581f; --primary-light:#eaddc3; --primary-ink:#6d3f14;
  --accent:#b45309; --accent-soft:#ecd7b6;
  --border-color:#ded1b6; 
  --callout-bg:#e9dcc0; --callout-border:#8f7326;
}
body.sepia-mode{ --border-strong:#c9b28a; }
body.font-dyslexic{
  --font-main:'OpenDyslexic','Open Dyslexic','Lexend','Comic Sans MS',Verdana,sans-serif;
  --font-ui:'OpenDyslexic','Open Dyslexic','Lexend','Comic Sans MS',Verdana,sans-serif;
  --letter-spacing:.035em; --line-height:1.95; --measure:62ch;
}
body.font-dyslexic p{word-spacing:.14em;text-align:left}
body.font-dyslexic h1,body.font-dyslexic h2,body.font-dyslexic h3{letter-spacing:.02em}
body.contrast-high{ --text-main:#000; --bg-body:#fff; --bg-card:#fff; --border-color:#000; --border-strong:#000; --text-muted:#222; }
body.contrast-high.dark-mode{ --text-main:#fff; --bg-body:#000; --bg-card:#000; --border-color:#fff; --text-muted:#eee; }

*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;scroll-padding-top:96px}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}*{animation:none!important;transition:none!important}}

body{
  background:var(--bg-body); color:var(--text-main);
  font-family:var(--font-main); font-size:var(--font-size);
  line-height:var(--line-height); letter-spacing:var(--letter-spacing);
  transition:background-color .3s,color .3s;
  -webkit-font-smoothing:antialiased;
}
body.focus-mode .sidebar{display:none}
body.focus-mode .main-content{max-width:70ch;margin:0 auto}

.skip-link{position:absolute;left:-9999px;top:0;background:var(--primary);color:#fff;padding:.75rem 1.25rem;z-index:2000;border-radius:0 0 8px 0;font-family:var(--font-ui)}
.skip-link:focus{left:0}

/* ---------- Barra de progresso de rolagem ---------- */
#progress-container{position:fixed;top:0;left:0;width:100%;height:5px;background:rgba(100,116,139,.15);z-index:1200}
#progress-bar{height:100%;width:0;background:linear-gradient(90deg,#38bdf8,#818cf8,#c084fc,#f472b6);transition:width .12s ease}

/* ---------- Toolbar ---------- */
.reader-toolbar{
  position:sticky;top:0;z-index:1100;background:var(--bg-card);
  border-bottom:1px solid var(--border-color);box-shadow:var(--shadow-sm);
  padding:.6rem 1.25rem;display:flex;flex-wrap:wrap;align-items:center;
  justify-content:space-between;gap:.75rem;font-family:var(--font-ui);
}
.toolbar-group{display:flex;align-items:center;gap:.4rem;flex-wrap:wrap}
.toolbar-brand{display:flex;align-items:center;gap:.6rem;min-width:0}
.brand-mark{width:34px;height:34px;border-radius:9px;flex:0 0 auto;
  background:conic-gradient(from 210deg,#fbbf24,#f472b6,#a78bfa,#38bdf8,#34d399,#fbbf24);
  box-shadow:var(--shadow-sm)}

.btn-tool{
  background:var(--bg-body);color:var(--text-main);border:1px solid var(--border-color);
  padding:.42rem .7rem;border-radius:9px;cursor:pointer;font-family:var(--font-ui);
  font-size:.88rem;line-height:1.2;display:inline-flex;align-items:center;gap:.35rem;
  transition:all .18s;white-space:nowrap;min-height:36px;
}
.btn-tool:hover{border-color:var(--primary);color:var(--primary);transform:translateY(-1px)}
.btn-tool:focus-visible,.nav-link:focus-visible,select:focus-visible,a:focus-visible,button:focus-visible{outline:3px solid var(--accent);outline-offset:2px}
.btn-tool.active{background:var(--primary);color:#fff;border-color:var(--primary)}
.btn-tool[aria-pressed="true"]{background:var(--primary);color:#fff;border-color:var(--primary)}

/* ---------- Combobox de cadernos ---------- */
.caderno-picker{position:relative;display:flex;align-items:center;gap:.4rem}
.caderno-picker select{
  appearance:none;-webkit-appearance:none;
  font-family:var(--font-ui);font-size:.92rem;font-weight:600;
  color:var(--text-main);background:var(--bg-body);
  border:1px solid var(--border-strong);border-radius:10px;
  padding:.5rem 2.2rem .5rem .8rem;cursor:pointer;max-width:min(52vw,420px);
  text-overflow:ellipsis;min-height:38px;
}
.caderno-picker select:hover{border-color:var(--primary)}
.caderno-picker::after{
  content:"▾";position:absolute;right:.7rem;pointer-events:none;
  color:var(--text-muted);font-size:.9rem
}
.caderno-picker .picker-nav{display:flex;gap:.25rem}

/* ---------- Layout ---------- */
.app-container{display:flex;max-width:1460px;margin:0 auto;min-height:100vh;gap:0}
.sidebar{
  width:330px;flex:0 0 330px;position:sticky;top:57px;height:calc(100vh - 57px);
  overflow-y:auto;padding:1.25rem 1rem 3rem;border-right:1px solid var(--border-color);
  background:var(--bg-sidebar);font-family:var(--font-ui);scrollbar-width:thin;
}
.sidebar h3{font-size:.78rem;text-transform:uppercase;letter-spacing:.06em;color:var(--text-muted);margin:.25rem 0 .75rem}
.nav-list{list-style:none}
.nav-item{margin-bottom:.2rem}
.nav-link{
  display:flex;align-items:flex-start;gap:.5rem;padding:.5rem .7rem;color:var(--text-main);
  text-decoration:none;border-radius:8px;font-size:.93rem;line-height:1.35;
  transition:background .18s,color .18s;
}
.nav-link .lbl{display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.nav-link .tick{margin-top:.18rem}
.sidebar.show-all .nav-link .lbl{-webkit-line-clamp:unset}
.nav-link:hover{background:var(--primary-light);color:var(--primary-ink)}
.nav-link.active{background:var(--primary);color:#fff;font-weight:600}
.nav-link .tick{flex:0 0 auto;width:18px;height:18px;border-radius:50%;border:2px solid var(--border-strong);
  display:inline-flex;align-items:center;justify-content:center;font-size:.65rem;color:transparent;transition:all .2s}
.nav-link.done .tick{background:var(--ok);border-color:var(--ok);color:#fff}
.nav-link.done .tick::after{content:"✓"}
.nav-link.active .tick{border-color:#fff}

.main-content{flex:1;min-width:0;padding:2rem 3.25rem 5rem;max-width:960px;margin:0 auto}

/* ---------- Painel de progresso do caderno ---------- */
.course-panel{
  background:var(--bg-card);border:1px solid var(--border-color);border-radius:12px;
  padding:1rem;margin-bottom:1.25rem;font-family:var(--font-ui);box-shadow:var(--shadow-sm)
}
.course-panel .cp-top{display:flex;align-items:baseline;justify-content:space-between;gap:.5rem;margin-bottom:.5rem}
.course-panel .cp-label{font-size:.75rem;text-transform:uppercase;letter-spacing:.06em;color:var(--text-muted)}
.course-panel .cp-pct{font-size:1.35rem;font-weight:700;color:var(--primary)}
.meter{height:9px;border-radius:99px;background:rgba(100,116,139,.2);overflow:hidden}
.meter>span{display:block;height:100%;border-radius:99px;background:linear-gradient(90deg,var(--ok),#38bdf8);transition:width .4s ease}
.course-panel .cp-sub{font-size:.8rem;color:var(--text-muted);margin-top:.5rem}
.cp-actions{display:flex;gap:.4rem;margin-top:.75rem;flex-wrap:wrap}
.cp-actions .btn-tool{font-size:.8rem;padding:.35rem .6rem;min-height:32px}

/* ---------- Tipografia ---------- */
h1,h2,h3,h4{font-family:var(--font-ui);font-weight:700;color:var(--text-main);line-height:1.28;margin:2rem 0 1rem}
h1{font-size:clamp(1.7rem,3.4vw,2.3rem);border-bottom:3px solid var(--primary);padding-bottom:.5rem;margin-top:.5rem}
h2{font-size:clamp(1.35rem,2.6vw,1.65rem);margin-top:2.75rem;display:flex;align-items:center;gap:.55rem;flex-wrap:wrap}
h3{font-size:clamp(1.12rem,2vw,1.3rem);color:var(--primary-ink);margin-top:2rem}
h4{font-size:1.05rem;color:var(--text-main);margin-top:1.5rem}
p{margin-bottom:1.2rem;text-align:left;hyphens:auto;max-width:var(--measure)}
body.justify p{text-align:justify}
ul,ol{margin:0 0 1.2rem 0;padding-left:1.5rem;max-width:var(--measure)}
li{margin-bottom:.5rem}
li::marker{color:var(--primary)}
a{color:var(--primary-ink);text-underline-offset:3px}
strong{font-weight:700}
blockquote{
  margin:1.75rem 0;padding:1rem 1.4rem;border-left:5px solid var(--purple);
  background:var(--bg-card);border-radius:0 12px 12px 0;font-style:italic;color:var(--text-main);
  box-shadow:var(--shadow-sm)
}
blockquote cite{display:block;margin-top:.6rem;font-style:normal;font-size:.85rem;color:var(--text-muted);font-family:var(--font-ui)}
hr.sep{margin:2.75rem 0;border:0;border-top:1px solid var(--border-color)}

/* ---------- Seções e marcação de leitura ---------- */
section{scroll-margin-top:96px}
.section-head{display:flex;align-items:flex-start;justify-content:space-between;gap:1rem;flex-wrap:wrap}
.mark-read{
  font-family:var(--font-ui);font-size:.8rem;display:inline-flex;align-items:center;gap:.45rem;
  background:var(--bg-card);border:1px solid var(--border-color);border-radius:99px;
  padding:.35rem .8rem;cursor:pointer;color:var(--text-muted);transition:all .2s;white-space:nowrap;min-height:34px
}
.mark-read:hover{border-color:var(--ok);color:var(--ok)}
.mark-read[aria-pressed="true"]{background:var(--ok);border-color:var(--ok);color:#fff}
.mark-read .box{width:16px;height:16px;border:2px solid currentColor;border-radius:4px;display:inline-block}
.mark-read[aria-pressed="true"] .box{background:#fff;border-color:#fff;position:relative}
.mark-read[aria-pressed="true"] .box::after{content:"✓";position:absolute;inset:0;color:var(--ok);font-size:.7rem;line-height:12px;text-align:center;font-weight:700}

/* ---------- Cards e callouts ---------- */
.box-card{
  border-radius:var(--radius);padding:1.25rem 1.4rem;margin:1.75rem 0;
  background:var(--bg-card);border:1px solid var(--border-color);
  border-left:5px solid var(--border-strong);box-shadow:var(--shadow-sm)
}
.box-card>p:last-child,.box-card>ul:last-child,.box-card>ol:last-child{margin-bottom:0}
.box-card p,.box-card ul,.box-card ol{max-width:none}
.box-card.pause{border-left-color:var(--accent);background:var(--accent-soft)}
.box-card.remember{border-left-color:var(--callout-border);background:var(--callout-bg)}
.box-card.more-info{border-left-color:var(--info);background:var(--primary-light)}
.box-card.story{border-left-color:var(--story);background:color-mix(in srgb,var(--story) 10%,var(--bg-card))}
.box-card.law{border-left-color:var(--purple);background:color-mix(in srgb,var(--purple) 9%,var(--bg-card))}
.box-card.practice{border-left-color:#0ea5e9;background:color-mix(in srgb,#0ea5e9 9%,var(--bg-card))}
.box-card.alert{border-left-color:#ef4444;background:color-mix(in srgb,#ef4444 8%,var(--bg-card))}
.box-title{font-family:var(--font-ui);font-weight:700;font-size:1.03rem;margin-bottom:.6rem;display:flex;align-items:center;gap:.5rem}

/* ---------- Figuras ---------- */
figure{margin:2rem 0;text-align:center}
figure img{
  max-width:100%;height:auto;border-radius:12px;border:1px solid var(--border-color);
  background:#fff;box-shadow:var(--shadow-md);cursor:zoom-in
}
figure img.plain{border:none;box-shadow:none;background:transparent}
figcaption{
  font-family:var(--font-ui);font-size:.85rem;color:var(--text-muted);
  margin-top:.65rem;line-height:1.5;max-width:70ch;margin-inline:auto;text-align:center
}
figcaption b{color:var(--text-main)}
.fig-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(230px,1fr));gap:1.25rem;margin:2rem 0}
.fig-grid figure{margin:0}

/* Lightbox */
.lightbox{position:fixed;inset:0;background:rgba(2,6,23,.9);z-index:3000;display:none;align-items:center;justify-content:center;padding:2rem;cursor:zoom-out}
.lightbox.open{display:flex}
.lightbox img{max-width:96%;max-height:92%;border-radius:10px;box-shadow:var(--shadow-lg);background:#fff}
.lightbox .lb-close{position:absolute;top:1rem;right:1.25rem;background:#fff;color:#0f172a;border:0;border-radius:50%;width:44px;height:44px;font-size:1.3rem;cursor:pointer}

/* ---------- Tabelas ---------- */
.table-responsive{overflow-x:auto;max-width:100%;-webkit-overflow-scrolling:touch;margin:2rem 0;border-radius:12px;border:1px solid var(--border-color);box-shadow:var(--shadow-sm)}
table{width:100%;border-collapse:collapse;font-family:var(--font-ui);font-size:.93rem;background:var(--bg-card)}
caption{caption-side:top;text-align:left;font-family:var(--font-ui);font-weight:700;font-size:.95rem;padding:.85rem 1rem;color:var(--text-main);background:var(--bg-card);border-bottom:1px solid var(--border-color)}
th,td{border-top:1px solid var(--border-color);padding:.7rem .9rem;text-align:left;vertical-align:top;line-height:1.55}
thead th{background:var(--primary-light);color:var(--primary-ink);font-weight:700;border-top:0}
tbody tr:nth-child(even){background:color-mix(in srgb,var(--text-muted) 6%,transparent)}
td strong{color:var(--text-main)}

/* ---------- Hero ---------- */
.watercolor-hero{
  background:linear-gradient(135deg,rgba(168,85,247,.16),rgba(56,189,248,.16) 50%,rgba(251,191,36,.18));
  border-radius:18px;padding:1.75rem;margin-bottom:2rem;text-align:center;border:1px solid var(--border-color)
}
.watercolor-hero img{max-width:min(430px,100%);height:auto;border-radius:14px;box-shadow:var(--shadow-md);background:#fff}
.watercolor-hero svg{max-width:100%;height:auto}
.watercolor-hero p{text-align:center;max-width:none}
.hero-kicker{font-family:var(--font-ui);font-size:.78rem;letter-spacing:.14em;text-transform:uppercase;color:var(--primary-ink);font-weight:700;margin-bottom:0}
.hero-title{font-family:var(--font-ui);font-size:clamp(1.2rem,2.6vw,1.6rem);font-weight:700;margin:.5rem auto .25rem;line-height:1.3;max-width:26ch}
.hero-desc{font-size:.86rem;color:var(--text-muted);margin-top:.9rem;font-style:italic;max-width:66ch;margin-inline:auto;text-align:center}

.meta-card{background:var(--bg-card);border:1px solid var(--border-color);border-radius:12px;padding:1.15rem 1.3rem;margin:1.5rem 0;font-family:var(--font-ui);font-size:.88rem;line-height:1.55}
.meta-card p{max-width:none;text-align:left;margin-bottom:.9rem}
.meta-card p:last-child{margin-bottom:0}

/* ---------- Passos / fluxos ---------- */
.step-container{display:flex;flex-direction:column;gap:.7rem;margin:2rem 0;font-family:var(--font-ui)}
.step-item{padding:.9rem 1.15rem;border-radius:10px;font-weight:600;display:flex;align-items:center;gap:.9rem;box-shadow:var(--shadow-sm);line-height:1.45}
.step-item .n{flex:0 0 auto;width:30px;height:30px;border-radius:50%;background:rgba(255,255,255,.65);display:grid;place-items:center;font-weight:800}
.step-1{background:#bae6fd;color:#075985}.step-2{background:#c7d2fe;color:#3730a3;margin-left:1rem}
.step-3{background:#fbcfe8;color:#9d174d;margin-left:2rem}.step-4{background:#e9d5ff;color:#6b21a8;margin-left:3rem}
.step-5{background:#bbf7d0;color:#166534;margin-left:4rem}.step-6{background:#fed7aa;color:#9a3412;margin-left:5rem}
body.dark-mode .step-item{color:#0b1220}

.chip-row{display:flex;flex-wrap:wrap;gap:.5rem;margin:1.25rem 0;font-family:var(--font-ui)}
.chip{background:var(--primary-light);color:var(--primary-ink);border:1px solid var(--border-color);border-radius:99px;padding:.35rem .8rem;font-size:.85rem;font-weight:600}

.keyfacts{display:grid;grid-template-columns:repeat(auto-fit,minmax(180px,1fr));gap:1rem;margin:1.75rem 0;font-family:var(--font-ui)}
.keyfact{background:var(--bg-card);border:1px solid var(--border-color);border-radius:12px;padding:1rem;box-shadow:var(--shadow-sm)}
.keyfact .kf-num{font-size:1.6rem;font-weight:800;color:var(--primary);line-height:1.1}
.keyfact .kf-lab{font-size:.82rem;color:var(--text-muted);margin-top:.3rem}

/* ---------- Glossário / termos ---------- */
dl.glossary{margin:1.5rem 0;font-family:var(--font-ui);font-size:.95rem}
dl.glossary dt{font-weight:700;color:var(--primary-ink);margin-top:.9rem}
dl.glossary dd{margin:.2rem 0 0 0;color:var(--text-main);line-height:1.6}

/* ---------- Referências ---------- */
.refs{font-family:var(--font-ui);font-size:.9rem;line-height:1.6}
.refs li{margin-bottom:.85rem;text-indent:-1.4rem;padding-left:1.4rem;list-style:none}
.refs{padding-left:0}

/* ---------- Rodapé ---------- */
.caderno-footer{margin-top:4rem;padding-top:1.5rem;border-top:1px solid var(--border-color);font-family:var(--font-ui);font-size:.85rem;color:var(--text-muted)}
.pager{display:flex;justify-content:space-between;gap:1rem;margin:2.5rem 0 1rem;font-family:var(--font-ui);flex-wrap:wrap}
.pager a{display:inline-flex;flex-direction:column;gap:.15rem;text-decoration:none;background:var(--bg-card);border:1px solid var(--border-color);border-radius:12px;padding:.8rem 1.1rem;box-shadow:var(--shadow-sm);transition:all .2s;max-width:48%}
.pager a:hover{border-color:var(--primary);transform:translateY(-2px)}
.pager .pg-lab{font-size:.72rem;text-transform:uppercase;letter-spacing:.07em;color:var(--text-muted)}
.pager .pg-title{font-weight:600;color:var(--text-main);font-size:.92rem}
.pager a.next{margin-left:auto;text-align:right}

/* ---------- Toast ---------- */
.toast{position:fixed;left:50%;bottom:1.5rem;transform:translateX(-50%) translateY(140%);
  background:var(--bg-elev);color:var(--text-main);border:1px solid var(--border-color);
  border-radius:99px;padding:.7rem 1.2rem;box-shadow:var(--shadow-lg);font-family:var(--font-ui);
  font-size:.9rem;z-index:2500;transition:transform .3s ease;pointer-events:none;max-width:90vw}
.toast.show{transform:translateX(-50%) translateY(0)}

/* ---------- Voltar ao topo / retomar ---------- */
.fab{position:fixed;right:1.25rem;bottom:1.25rem;z-index:1150;display:flex;flex-direction:column;gap:.5rem}
.fab button{width:46px;height:46px;border-radius:50%;border:1px solid var(--border-color);background:var(--bg-card);
  color:var(--text-main);cursor:pointer;box-shadow:var(--shadow-md);font-size:1.1rem;display:none;place-items:center}
.fab button.show{display:grid}

/* ---------- Painel do curso (index) ---------- */
.hub-wrap{max-width:1180px;margin:0 auto;padding:2rem 1.5rem 5rem}
.hub-hero{text-align:center;margin-bottom:2rem}
.hub-hero h1{border:0;display:inline-block}
.hub-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(270px,1fr));gap:1.15rem}
.vol-card{display:flex;flex-direction:column;background:var(--bg-card);border:1px solid var(--border-color);
  border-radius:16px;overflow:hidden;box-shadow:var(--shadow-sm);text-decoration:none;color:inherit;transition:all .2s}
.vol-card:hover{transform:translateY(-3px);box-shadow:var(--shadow-md);border-color:var(--primary)}
.vol-card .vc-cover{aspect-ratio:3/4;background:linear-gradient(160deg,rgba(56,189,248,.14),rgba(168,85,247,.12) 55%,rgba(251,191,36,.16));
  display:grid;place-items:center;overflow:hidden;padding:.65rem}
.vol-card .vc-cover img{width:auto;height:100%;max-width:100%;object-fit:contain;border-radius:6px;box-shadow:var(--shadow-sm)}
.vol-card .vc-body{padding:.9rem 1rem 1.1rem;font-family:var(--font-ui);display:flex;flex-direction:column;gap:.5rem;flex:1}
.vol-card .vc-num{font-size:.72rem;letter-spacing:.09em;text-transform:uppercase;color:var(--primary);font-weight:700}
.vol-card .vc-title{font-size:.98rem;font-weight:600;line-height:1.35}
.vol-card .vc-meta{font-size:.78rem;color:var(--text-muted);margin-top:auto}
.badge-done{display:inline-block;background:var(--ok);color:#fff;border-radius:99px;font-size:.7rem;padding:.15rem .5rem;font-weight:700}

/* ---------- Impressão ---------- */
@media print{
  .reader-toolbar,.sidebar,.fab,#progress-container,.mark-read,.course-panel,.pager,.toast{display:none!important}
  body{background:#fff;color:#000;font-size:11pt}
  .main-content{max-width:none;padding:0}
  figure img{box-shadow:none;page-break-inside:avoid}
  section{page-break-inside:auto}
  h2,h3{page-break-after:avoid}
}

/* ---------- Responsivo ---------- */
@media (max-width:1024px){ .main-content{padding:1.75rem 2rem 4rem} .sidebar{width:280px;flex-basis:280px} }
@media (max-width:900px){
  .app-container{flex-direction:column}
  .sidebar{width:100%;flex-basis:auto;height:auto;position:static;border-right:0;border-bottom:1px solid var(--border-color);max-height:none}
  .sidebar.collapsed .nav-list,.sidebar.collapsed .course-panel{display:none}
  .main-content{padding:1.25rem 1rem 4rem;margin:0;width:100%;max-width:100%}
  .step-item{margin-left:0!important}
  p{text-align:left;hyphens:manual}
  .pager a{max-width:100%}
  .caderno-picker select{max-width:100%;width:100%}
  .reader-toolbar{padding:.55rem .75rem}
}

/* ---- ajustes finais ---- */
.section-head{margin-top:2.5rem}
.section-head h1,.section-head h2,.section-head h3{margin-top:0;flex:1 1 22ch;min-width:0}
.section-head .mark-read{margin-top:.35rem}
figure img{max-height:78vh;object-fit:contain}
.watercolor-hero img{max-height:none}
kbd{font-family:ui-monospace,SFMono-Regular,Menlo,monospace;font-size:.78em;background:var(--bg-body);
    border:1px solid var(--border-color);border-bottom-width:2px;border-radius:5px;padding:.05em .35em}
.reading-time{font-family:var(--font-ui);font-size:.78rem;color:var(--text-muted);margin:-.4rem 0 1.1rem}
.toolbar-brand{flex:1 1 340px}
@media (max-width:900px){ .toolbar-brand{flex:1 1 100%} }

/* ---- sumário recolhível ---- */
.sidebar-toggle{display:none}
.sidebar .sidebar-toggle .chev{transition:transform .2s}
.sidebar.collapsed .sidebar-toggle .chev{transform:rotate(-90deg)}
@media (max-width:900px){
  .sidebar-toggle{display:flex;width:100%;justify-content:space-between;font-weight:600;margin-bottom:.5rem}
  .sidebar.collapsed h3{display:none}
  .sidebar{padding:.75rem 1rem}
  .btn-read-label{display:none}
  #btn-read{font-size:1rem}
  .reader-toolbar .toolbar-group{gap:.3rem}
  .btn-tool{padding:.4rem .55rem}
}

.main-content>*{max-width:100%}
figure,figure img{max-width:100%}

/* quebra de palavras longas (URLs, DOIs) para não estourar o layout */
p,li,dd,dt,td,th,figcaption,blockquote,.box-card,.meta-card{overflow-wrap:anywhere;word-break:break-word}
.refs li{overflow-wrap:anywhere}