@charset "UTF-8";
/* Inglês nas Alturas — Exercícios. Direção "Cabine calma" (docs/revisao-frontend-exercicios.md).
   Ordem: fontes, tokens, base, shell, componentes, páginas, ajuda, responsivo (767/1023 px). */

/* Fontes auto-hospedadas (CSP: style-src/font-src 'self'). Fira Sans, SIL OFL 1.1 — fonts/OFL.txt */
@font-face{font-family:"Fira Sans";font-style:normal;font-weight:400;font-display:swap;src:url("fonts/fira-sans-400.woff2") format("woff2")}
@font-face{font-family:"Fira Sans";font-style:normal;font-weight:500;font-display:swap;src:url("fonts/fira-sans-500.woff2") format("woff2")}
@font-face{font-family:"Fira Sans";font-style:normal;font-weight:600;font-display:swap;src:url("fonts/fira-sans-600.woff2") format("woff2")}
@font-face{font-family:"Fira Sans Condensed";font-style:normal;font-weight:600;font-display:swap;src:url("fonts/fira-sans-condensed-600.woff2") format("woff2")}

/* Tokens */
:root{
  --tarmac:#072B5F;--tarmac-2:#0E3A78;--tarmac-line:#25508C;--on-tarmac:#C7D6EA;
  --sky:#1D5FA8;--sky-soft:#E3EEFA;--navy-soft:#E8F0FA;
  --cloud:#F6F5F2;--paper:#FFFFFF;--ink:#0B2240;--muted:#56657A;--line:#D3DDEA;--line-soft:#E8ECF1;--control:#75869A;
  --clear:#1F6B4C;--clear-soft:#E4F2EA;--amber:#8A4A12;--amber-soft:#FCEFE0;--brand-red:#C7171A;
  --font:"Fira Sans","Segoe UI",system-ui,-apple-system,Roboto,Arial,sans-serif;
  --font-display:"Fira Sans Condensed","Fira Sans","Arial Narrow",Arial,sans-serif;
  --r-control:10px;--r-panel:14px;
  font-family:var(--font);font-size:16px;line-height:1.5;color:var(--ink);background:var(--cloud);
  font-variant-numeric:tabular-nums;scroll-behavior:smooth;
}

/* Base */
*{box-sizing:border-box}
body{margin:0;background:var(--cloud)}
[hidden]{display:none!important}
button,input,select,textarea{font:inherit;color:inherit}
button{cursor:pointer}
a{color:var(--sky);text-decoration:none}
a:hover{text-decoration:underline}
h1,h2,h3,p{margin:0}
h1{font-family:var(--font-display);font-size:39px;line-height:1.1;font-weight:600;letter-spacing:-.2px}
h2{font-size:20px;line-height:1.3;font-weight:600}
h3{font-size:17px;line-height:1.35;font-weight:600}
p{line-height:1.55}
strong{font-weight:600}
small,.small{font-size:13px}
.muted{color:var(--muted)}
.eyebrow{font-size:13px;font-weight:600;color:var(--muted)}
.stack{display:grid;gap:20px}
.icon{display:inline-flex;width:20px;height:20px;flex-shrink:0;vertical-align:middle}
.icon svg{width:100%;height:100%}
:focus-visible{outline:3px solid var(--sky);outline-offset:2px}
main:focus{outline:none}
.skip-link{position:fixed;left:16px;top:-60px;z-index:100;padding:10px 14px;background:var(--tarmac);color:#fff;font-weight:600}
.skip-link:focus{top:12px}
.loading{padding:80px 20px;text-align:center;color:var(--muted)}
summary{min-height:44px;padding:12px 18px;cursor:pointer}
progress{width:100%;height:6px;accent-color:var(--tarmac)}

/* Formulários */
input,select,textarea{width:100%;min-height:44px;padding:10px 12px;border:1px solid var(--control);border-radius:var(--r-control);background:var(--paper);color:var(--ink)}
input:hover,select:hover,textarea:hover{border-color:var(--ink)}
input[type=checkbox]{width:18px;height:18px;min-height:0;accent-color:var(--tarmac)}
.field{display:grid;gap:6px;font-size:15px;font-weight:500}
.field small{font-weight:400;line-height:1.45}
.form-error{padding:10px 12px;border-left:4px solid var(--amber);background:var(--amber-soft);color:var(--amber);font-size:15px}
.form-error:empty{display:none}

/* Botões */
.button{display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:44px;min-width:44px;padding:10px 18px;border:1px solid var(--control);border-radius:var(--r-control);background:var(--paper);color:var(--ink);font-size:15px;font-weight:500;line-height:1.3;text-align:center;white-space:normal;transition:background-color .15s,border-color .15s}
.button:hover{border-color:var(--ink)}
.button:disabled{opacity:.55;cursor:not-allowed}
.button.primary{background:var(--tarmac);border-color:var(--tarmac);color:#fff;font-weight:600}
.button.primary:hover{background:var(--tarmac-2);border-color:var(--tarmac-2)}
.button.text{border:0;background:transparent;color:var(--sky);padding:6px 8px}
.button.text:hover{text-decoration:underline}
.button.icon-button{width:44px;height:44px;padding:0;font-size:0}
/* Ação destrutiva (ex.: "Bloquear" na tela da professora): o vermelho da marca, só aqui fora do logo. */
.button.danger{border-color:#E3A9AA;color:var(--brand-red)}
.button.danger:hover{border-color:var(--brand-red);background:#FDF1F1}
.back-button{margin:0 0 16px;padding:8px 16px 8px 10px;border-color:var(--line);background:var(--paper);color:var(--tarmac);font-weight:600}
.back-button:hover{border-color:var(--sky);background:var(--navy-soft)}

/* Shell: barra lateral no desktop */
.sidebar{position:fixed;inset:0 auto 0 0;z-index:20;width:236px;height:100dvh;overflow-y:auto;display:flex;flex-direction:column;padding:24px 16px 20px;background:var(--paper);border-right:1px solid var(--line)}
.brand-wrap{display:flex;flex-direction:column;align-items:flex-end;gap:6px}
.brand{display:block;align-self:stretch;padding:0 8px}
.brand:hover{text-decoration:none}
.brand img{display:block;width:100%;max-width:196px;height:auto;margin:0 auto}
.beta-badge{padding:2px 8px;border:1px solid #9DB7D4;border-radius:999px;background:var(--paper);color:var(--tarmac);font-size:11px;font-weight:600;letter-spacing:.06em}
#navigation{display:grid;gap:4px;margin-top:12px}
.nav-item{display:flex;align-items:center;flex-wrap:wrap;gap:10px;min-height:44px;padding:10px 12px;border-radius:var(--r-control);color:var(--muted);font-weight:500}
.nav-item:hover{background:var(--cloud);color:var(--tarmac);text-decoration:none}
.nav-item.active{background:var(--navy-soft);color:var(--tarmac);font-weight:600;box-shadow:inset 3px 0 0 var(--tarmac)}
.nav-item[href="#admin"]{margin-top:12px}
.news-badge{flex:none;padding:1px 7px;border-radius:6px;background:var(--tarmac);color:#fff;font-size:12px;font-weight:600;white-space:nowrap}
.simulation-nav-slot{min-height:44px;visibility:hidden}
.beta-note{margin:14px 4px 0;padding:8px 10px;border-left:2px solid #9DB7D4;color:var(--muted);font-size:12px;line-height:1.45}
.sidebar-bottom{position:relative;margin-top:auto;padding-top:16px}
.account-toggle{display:none}
.account-panel{display:grid;gap:10px}
.account-panel strong{padding:0 4px;overflow-wrap:anywhere}
.local-note{padding:8px 4px 0;border-top:1px solid var(--line);color:var(--muted);font-size:12px;overflow-wrap:anywhere}
.signed-out #navigation,.signed-out .sidebar-bottom{display:none}
.workspace{margin-left:236px;min-height:100vh;min-width:0}
main{max-width:1380px;margin:0 auto;padding:40px 32px 56px}
.page-heading{display:flex;flex-wrap:wrap;align-items:flex-end;justify-content:space-between;gap:16px;margin-bottom:24px}
.page-heading p{max-width:62ch;margin-top:6px}

/* Painéis, listas, estados */
.panel{min-width:0;overflow:hidden;background:var(--paper);border:1px solid var(--line);border-radius:var(--r-panel)}
.panel-heading{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:12px;min-height:56px;padding:14px 20px;border-bottom:1px solid var(--line)}
.panel-body{padding:20px}
.note-box{padding:12px 14px;border-left:4px solid var(--tarmac);border-radius:var(--r-control);background:var(--navy-soft);font-size:15px}
.list-note{max-width:80ch;margin-top:14px;color:var(--muted);font-size:14px}
.empty{display:flex;flex-direction:column;align-items:center;gap:8px;padding:36px 24px;text-align:center}
.empty-icon{display:flex;align-items:center;justify-content:center;width:44px;height:44px;margin-bottom:4px;border:1px solid var(--line);border-radius:var(--r-control);color:var(--muted)}
.empty-icon .icon{width:24px;height:24px}
.empty p{max-width:40ch;font-size:15px}
.table-wrap{overflow:auto}
table{width:100%;border-collapse:collapse;text-align:left;font-size:15px}
th{padding:11px 20px;border-bottom:1px solid var(--line);background:#F7F8FA;color:var(--muted);font-size:13px;font-weight:500;white-space:nowrap}
td{padding:14px 20px;border-top:1px solid var(--line-soft);vertical-align:middle}
tbody tr:first-child td{border-top:0}
td .muted{display:block}
td:last-child,th:last-child{text-align:right}

/* Diálogos e avisos */
dialog{width:min(580px,calc(100% - 28px));max-height:92vh;padding:0;border:0;border-radius:var(--r-panel);color:var(--ink);box-shadow:0 24px 70px #0B224040}
dialog::backdrop{background:#0B224080}
dialog[open]{animation:rise .18s ease-out}
@keyframes rise{from{transform:translateY(8px);opacity:0}to{transform:none;opacity:1}}
.dialog-heading{display:flex;align-items:center;justify-content:space-between;gap:20px;padding:16px 16px 16px 22px;background:var(--tarmac);color:#fff}
.dialog-heading h2{font-size:21px}
.dialog-heading .button.icon-button{background:transparent;border-color:var(--tarmac-line);color:#fff}
.dialog-content{display:grid;gap:16px;max-height:66vh;overflow-y:auto;padding:22px}
.dialog-footer{display:flex;justify-content:flex-end;gap:10px;padding:14px 22px;border-top:1px solid var(--line);background:#F7F8FA}
.notifications{position:fixed;right:24px;bottom:24px;z-index:100;display:grid;gap:10px;max-width:420px}
.toast{padding:13px 18px;border-left:5px solid var(--clear);border-radius:var(--r-control);background:var(--tarmac);color:#fff;font-size:15px;box-shadow:0 10px 30px #0B224033}
.toast.error{border-left-color:#E8A23A}

/* Rota de voo: a assinatura. O <progress> fica por baixo para leitores de tela. */
.route{position:relative;height:28px;margin:2px 0;--route-at:0%}
.route-line{position:absolute;left:6px;right:8px;top:50%;height:2px;margin-top:-1px;background:repeating-linear-gradient(90deg,#B8C4D3 0 6px,transparent 6px 11px)}
.route-line::before{content:"";position:absolute;left:-6px;top:-4px;width:10px;height:10px;border-radius:50%;background:var(--tarmac)}
.route-line::after{content:"";position:absolute;right:-8px;top:-6px;width:14px;height:14px;border:2px solid var(--tarmac);border-radius:50%;background:var(--paper);box-sizing:border-box}
.route-done{position:absolute;left:0;top:0;bottom:0;width:var(--route-at);background:var(--tarmac);transition:width .35s ease-out}
.route-plane{position:absolute;top:50%;left:var(--route-at);z-index:1;display:flex;align-items:center;justify-content:center;width:28px;height:28px;margin:-14px 0 0 -14px;border-radius:50%;background:var(--paper);color:var(--tarmac);transition:left .35s ease-out}
.route-plane .icon{width:20px;height:20px;transform:rotate(45deg)}
.route progress{position:absolute;inset:0;width:100%;height:100%;opacity:0;pointer-events:none}

/* Aviso de cabine: feedback */
.feedback{display:grid;gap:6px;padding:16px 18px;border-left:4px solid var(--line);border-radius:var(--r-control);background:var(--cloud);line-height:1.55}
.feedback:empty{display:none}
.feedback.correct{border-left-color:var(--clear);background:var(--clear-soft)}
.feedback.incorrect{border-left-color:var(--amber);background:var(--amber-soft)}
.feedback.correct,.feedback.incorrect{animation:chime .16s ease-out}
@keyframes chime{from{opacity:0;transform:scale(.98)}to{opacity:1;transform:none}}
.feedback-title{display:flex;align-items:center;gap:8px;font-size:17px}
.feedback.correct .feedback-title{color:var(--clear)}
.feedback.incorrect .feedback-title{color:var(--amber)}
.feedback strong{display:block}

/* Exercícios: home */
.practice-banner{display:grid;grid-template-columns:minmax(0,1fr) auto;gap:20px 32px;align-items:start;margin-bottom:24px;padding:26px 28px;border-radius:var(--r-panel);background:var(--tarmac);color:#fff}
.practice-intro{display:grid;gap:8px;min-width:0}
.practice-banner .eyebrow{color:var(--on-tarmac)}
.practice-banner h2{font-family:var(--font-display);font-size:31px;line-height:1.15}
.practice-banner p{color:var(--on-tarmac)}
.practice-totals{display:grid;gap:6px;align-content:start}
.practice-totals p{display:flex;align-items:baseline;gap:8px}
.practice-totals strong{font-family:var(--font-display);font-size:31px;color:#fff;line-height:1.1}
.boarding-pass{display:grid;grid-template-columns:minmax(0,1fr) auto;max-width:560px;margin-top:10px;border-radius:var(--r-panel);background:var(--paper);color:var(--ink)}
.boarding-main{display:grid;gap:4px;align-content:center;min-width:0;padding:16px 18px}
.practice-totals .streak{display:block;max-width:260px;padding-top:6px;border-top:1px solid var(--tarmac-line);color:#fff;font-weight:500}
.practice-banner .boarding-label{color:var(--muted);font-size:14px;font-weight:600}
.boarding-subject{font-size:20px;line-height:1.3;overflow-wrap:anywhere}
.boarding-stub{position:relative;display:grid;justify-items:center;align-content:center;gap:6px;padding:14px 18px;border-left:2px dashed var(--line)}
.boarding-stub::before,.boarding-stub::after{content:"";position:absolute;left:-9px;width:16px;height:16px;border-radius:50%;background:var(--tarmac)}
.boarding-stub::before{top:-8px}
.boarding-stub::after{bottom:-8px}
.boarding-count{font-family:var(--font-display);font-size:25px;font-weight:600;color:var(--tarmac);line-height:1}
.boarding-stub a{display:inline-flex;align-items:center;min-height:44px;padding:0 18px;border-radius:var(--r-control);background:var(--tarmac);color:#fff;font-weight:600}
.boarding-stub a:hover{background:var(--tarmac-2);text-decoration:none}
.practice-banner .practice-done{margin-top:6px;color:#fff;font-weight:600}
.simulation-news{display:flex;flex-wrap:wrap;align-items:center;gap:12px 16px;margin-bottom:24px;padding:12px 16px 12px 20px;border-left:4px solid var(--tarmac);border-radius:var(--r-control);background:var(--navy-soft)}
.simulation-news p{flex:1;min-width:min(100%,220px)}
.simulation-news a{display:inline-flex;align-items:center;min-height:44px;font-weight:600}
.simulation-news .button{flex:none;width:44px;height:44px;padding:10px}
.subject-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:18px}
.subject-card{display:flex;flex-direction:column;gap:12px;padding:22px;border:1px solid var(--line);border-radius:var(--r-panel);background:var(--paper);color:var(--ink);transition:border-color .15s}
.subject-card:hover{border-color:var(--sky);text-decoration:none}
.subject-number{font-family:var(--font-display);font-size:15px;font-weight:600;color:var(--sky)}
.subject-card h2{font-size:20px}
.subject-card p{flex:1;font-size:15px}
.subject-progress{display:flex;justify-content:space-between;font-size:14px}
.card-action{color:var(--sky);font-size:15px;font-weight:600}

/* Sessão de prática (Exercícios, Simulados, Estudo) */
.exercise-body{display:grid;gap:20px;max-width:780px;margin:auto;padding:28px}
.exercise-meta{display:flex;flex-wrap:wrap;justify-content:space-between;gap:8px 12px;color:var(--muted);font-size:14px}
.exercise-prompt{font-size:25px;line-height:1.4}
.exercise-prompt:focus{outline:2px solid var(--sky);outline-offset:4px}
.translation-support summary{display:inline-flex;align-items:center;min-height:44px;padding:0;color:var(--sky);font-size:15px;font-weight:500}
.translation-support p{margin-bottom:6px;padding:10px 12px;border-radius:var(--r-control);background:var(--navy-soft);white-space:pre-line}
.answer-controls{display:grid;gap:10px;margin:0;padding:0;border:0}
.answer-controls legend{margin-bottom:12px}
fieldset:disabled{opacity:.85}
.choice{display:flex;flex-wrap:wrap;align-items:center;gap:12px;min-height:52px;padding:12px 16px;border:1px solid var(--control);border-radius:var(--r-control);background:var(--paper);cursor:pointer}
.choice:has(input:checked){border-color:var(--sky);background:var(--sky-soft)}
.choice input{flex-shrink:0;width:20px;min-height:20px;accent-color:var(--tarmac)}
.choice-marker{margin-left:auto;font-size:14px;font-weight:600}
.choice-correct{border-color:var(--clear)!important;background:var(--clear-soft)!important}
.choice-correct .choice-marker{color:var(--clear)}
.choice-incorrect{border-color:var(--amber)!important;background:var(--amber-soft)!important}
.choice-incorrect .choice-marker{color:var(--amber)}
.choice-pending{color:var(--sky);font-weight:600}
.sentence{min-height:60px;padding:16px;border-radius:var(--r-control);background:var(--cloud)}
.word-bank,.result-actions{display:flex;flex-wrap:wrap;gap:12px}
.result{display:grid;gap:18px;padding:36px;text-align:center}
.result .result-actions{justify-content:center}
.result-score{font-family:var(--font-display);font-size:64px;line-height:1;color:var(--tarmac)}
.congratulations{padding:12px 16px;border-radius:var(--r-control);background:var(--clear-soft);color:var(--clear);font-weight:600}
.review-list{display:grid;gap:12px;margin-top:24px}

/* Simulados */
.simulation-page{display:grid;gap:20px}
.simulation-page section{min-width:0}
.simulation-page h1,.simulation-page h2{overflow-wrap:anywhere}
.simulation-page h1:focus{outline:2px solid var(--sky);outline-offset:4px}
.simulation-page .panel{overflow:visible}
.simulation-page .back-button{justify-self:start;margin:0}
.simulation-models{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:18px;margin-top:12px}
.simulation-models>*{min-width:0}
.model-status{color:var(--muted)}
.simulation-history{display:grid;gap:12px}
.simulation-history .button{justify-content:flex-start;text-align:left}
.simulation-actions{justify-content:flex-start}
.simulation-tools{display:flex;flex-wrap:wrap;align-items:flex-start;gap:12px}
.simulation-tools .simulation-map{flex:1 1 280px;min-width:0;border:1px solid var(--line);border-radius:var(--r-control);background:var(--paper)}
.simulation-map .word-bank{padding:0 14px 14px}
.simulation-page .word-bank [aria-current="step"]{outline:2px solid var(--tarmac);outline-offset:2px}
.topic-list{display:grid;gap:12px;margin:0;padding:0;list-style:none}
.topic-list li{display:grid;gap:4px}
.topic-row{display:flex;flex-wrap:wrap;justify-content:space-between;gap:12px}
.topic-list progress{height:10px}

/* Vocabulário, Frases e Modo estudo */
.vocabulary-filters{display:grid;grid-template-columns:2fr 1fr;gap:12px;margin-bottom:16px}
.vocabulary-filters.phrase-filters{grid-template-columns:2fr 1fr 1fr;margin-top:20px}
.vocabulary-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(min(100%,290px),1fr));gap:16px;margin-top:16px}
.vocabulary-note{margin-top:10px;font-size:15px}
.list-more{display:flex;width:100%;margin-top:16px}
.panel:has(.study-panel){margin-bottom:32px;box-shadow:0 6px 0 -1px var(--paper),0 6px 0 0 var(--line),0 12px 0 -1px var(--paper),0 12px 0 0 var(--line-soft)}
.study-panel{display:grid;gap:12px}
.study-stats{font-size:17px}
.study-stats strong{font-family:var(--font-display);font-size:25px;color:var(--tarmac)}
.study-actions{display:flex;flex-wrap:wrap;align-items:center;gap:12px}
.study-actions select{flex:1 1 200px}
.study-actions .button{flex:1 1 200px}
.study-session{display:grid;gap:10px}
.study-card{display:grid;gap:16px}
.study-front{font-family:var(--font-display);font-size:clamp(25px,6vw,39px);line-height:1.15;overflow-wrap:anywhere}
.study-front:focus,.study-answer:focus{outline:2px solid var(--sky);outline-offset:4px}
.study-back{display:grid;gap:12px;padding-top:14px;border-top:1px dashed var(--line)}
.study-answer{font-size:20px;font-weight:600}
.study-grade .button{flex:1 1 160px}

/* Pronúncia */
.speech-disclosure{margin-top:12px;border-top:1px solid var(--line-soft)}
.speech-disclosure summary{display:flex;align-items:center;padding:4px 0 0;color:var(--sky);font-weight:600}
.speech-practice{display:grid;gap:12px;min-width:0;max-width:100%;margin-top:14px;padding-top:14px;border-top:1px solid var(--line);overflow-wrap:anywhere}
.speech-practice>*{min-width:0;margin:0}
.speech-practice button{justify-self:start}
.speech-practice button:disabled{opacity:.75}
.speech-model{display:flex;flex-wrap:wrap;gap:12px}
.speech-model p{flex-basis:100%}
.speech-status{display:grid;gap:8px;overflow-wrap:anywhere}
.speech-diff{margin:0;padding-left:22px;border-left:3px solid var(--amber)}
.speech-diff li{padding:4px 0}

/* Acesso e professora */
.access-shell{max-width:520px;margin:4vh auto}
.access-shell .panel{margin-top:20px}
.panel:has(.engagement-grid){margin-bottom:24px}
.engagement-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(min(100%,200px),1fr));gap:16px}
.engagement-stat{display:grid;gap:4px}
.engagement-stat strong{font-family:var(--font-display);font-size:31px;color:var(--tarmac)}
.progress-cell{display:grid;gap:4px;min-width:200px}

/* Ajuda: botão "?" e painel */
.help-button{display:flex;align-items:center;gap:10px;width:100%;min-height:44px;margin-top:20px;padding:10px 12px;border:1px solid var(--line);border-radius:var(--r-control);background:var(--paper);color:var(--tarmac);font-size:15px;font-weight:600;text-align:left}
.help-button:hover{border-color:var(--sky);background:var(--navy-soft)}
.help-button .icon{width:22px;height:22px}
dialog.help-dialog{inset:0 0 0 auto;width:min(520px,100%);max-width:100%;height:100%;max-height:100%;margin:0;padding:0;border-radius:0;background:var(--paper);box-shadow:-12px 0 48px #0B224033}
dialog.help-dialog[open]{animation:help-in .2s ease-out}
@keyframes help-in{from{transform:translateX(24px);opacity:0}to{transform:none;opacity:1}}
.help-sheet{display:flex;flex-direction:column;height:100%}
.help-heading{flex:none;display:flex;align-items:center;justify-content:space-between;gap:16px;padding:12px 16px 12px 22px;background:var(--tarmac);color:#fff}
.help-heading h2{font-family:var(--font-display);font-size:25px}
.help-heading .button.icon-button{background:transparent;border-color:var(--tarmac-line);color:#fff}
.help-body{flex:1;display:grid;align-content:start;gap:24px;padding:18px 22px 40px;overflow-y:auto;overscroll-behavior:contain}
.help-section{display:grid;gap:10px;min-width:0;scroll-margin-top:12px}
.help-section h3{padding-bottom:6px;border-bottom:1px solid var(--line);color:var(--tarmac)}
.help-block{min-width:0;border:1px solid var(--line);border-radius:var(--r-control);background:var(--paper);scroll-margin-top:12px}
.help-block summary{display:flex;align-items:center;gap:10px;min-height:48px;padding:12px 16px;color:var(--ink);font-weight:600;list-style:none}
.help-block summary::-webkit-details-marker{display:none}
.help-block summary::before{content:"";flex:none;width:8px;height:8px;border-right:2px solid var(--sky);border-bottom:2px solid var(--sky);transform:rotate(-45deg);transition:transform .15s}
.help-block[open] summary{border-bottom:1px solid var(--line-soft);color:var(--tarmac)}
.help-block[open] summary::before{transform:rotate(45deg)}
.help-block-body{display:grid;gap:10px;padding:14px 16px 16px;overflow-wrap:anywhere}
.help-steps,.help-tips{display:grid;gap:6px;margin:0;padding-left:22px}
.help-example{padding:10px 12px;border-radius:var(--r-control);background:var(--navy-soft)}

/* Movimento reduzido */
@media (prefers-reduced-motion:reduce){
  :root{scroll-behavior:auto}
  *,*::before,*::after{animation:none!important;transition:none!important}
}

/* Até 1023 px: cabeçalho no topo, menu em 4 colunas */
@media (max-width:1023px){
  .sidebar{position:static;width:auto;height:auto;overflow:visible;flex-direction:row;flex-wrap:wrap;align-items:center;gap:12px;padding:14px 24px;border-right:0;border-bottom:1px solid var(--line)}
  .brand-wrap{flex:none;flex-direction:row;align-items:flex-end;gap:6px}
  .brand{padding:0}
  .brand img{width:auto;height:56px;max-width:none}
  .beta-badge{margin-bottom:2px}
  .beta-note{display:none}
  .help-button{order:2;flex:none;width:44px;height:44px;margin:0 0 0 auto;padding:0;justify-content:center;border-color:var(--control);border-radius:50%}
  .help-button .help-label{display:none}
  .signed-out .help-button{margin-left:auto}
  .sidebar-bottom{order:3;flex:none;margin:0;padding:0}
  .account-toggle{display:inline-flex;align-items:center;justify-content:center;width:44px;height:44px;padding:0;border:1px solid var(--control);border-radius:50%;background:var(--navy-soft);color:var(--tarmac);font-size:14px;font-weight:600}
  .account-panel{display:none;position:absolute;right:0;top:calc(100% + 8px);z-index:30;width:max-content;min-width:220px;max-width:calc(100vw - 32px);padding:16px;border:1px solid var(--line);border-radius:var(--r-panel);background:var(--paper);box-shadow:0 12px 32px #0B224026}
  .sidebar-bottom.open .account-panel{display:grid}
  #navigation{order:4;flex-basis:100%;grid-template-columns:repeat(4,minmax(0,1fr));gap:6px;margin:0}
  .nav-item{font-size:15px}
  .nav-item.active{box-shadow:inset 0 -3px 0 var(--tarmac)}
  .nav-item[href="#admin"]{grid-column:1/-1;margin-top:0}
  .workspace{margin-left:0}
  main{padding:28px 24px 48px}
  h1{font-size:31px}
  .subject-grid,.simulation-models{grid-template-columns:repeat(2,minmax(0,1fr))}
}

/* Até 767 px: celular, menu fixo no rodapé (uma linha, com safe area) */
@media (max-width:767px){
  .sidebar{gap:10px;padding:10px 16px}
  .brand img{height:44px}
  /* Menu fixo no rodapé, ao alcance do polegar. */
  #navigation{position:fixed;left:0;right:0;bottom:0;z-index:25;grid-template-columns:none;grid-auto-flow:column;grid-auto-columns:minmax(0,1fr);gap:4px;margin:0;padding:6px 8px calc(6px + env(safe-area-inset-bottom));background:var(--paper);border-top:1px solid var(--line);box-shadow:0 -6px 18px #0B22400F}
  .nav-item{position:relative;flex-direction:column;flex-wrap:nowrap;justify-content:center;gap:2px;min-height:52px;padding:4px 2px;font-size:12px;line-height:1.2;text-align:center}
  .nav-item .icon{width:22px;height:22px}
  .nav-item.active{box-shadow:inset 0 3px 0 var(--tarmac)}
  .nav-item .news-badge{position:absolute;top:2px;left:calc(50% + 6px);padding:0 5px;font-size:10px}
  .nav-item[href="#admin"]{grid-column:auto}
  .simulation-nav-slot{display:none}
  main{padding:20px 16px calc(96px + env(safe-area-inset-bottom))}
  .page-heading{margin-bottom:18px}
  .practice-banner{grid-template-columns:1fr;gap:14px;padding:20px}
  .practice-banner h2{font-size:25px}
  .practice-totals{display:flex;flex-wrap:wrap;gap:4px 20px}
  .practice-totals strong{font-size:25px}
  .subject-grid,.simulation-models{grid-template-columns:1fr;gap:16px}
  .subject-card{padding:18px}
  .exercise-body{padding:18px}
  .exercise-prompt{font-size:21px}
  .result{padding:28px 18px}
  .result-score{font-size:52px}
  .result-actions>.button{flex:1 1 100%}
  .simulation-actions{display:grid;grid-template-columns:1fr 1fr}
  .simulation-actions button[type="submit"]{grid-column:1/-1}
  .simulation-actions .button{width:100%}
  .simulation-tools>.button{width:100%}
  .vocabulary-filters,.vocabulary-filters.phrase-filters{grid-template-columns:1fr}
  .notifications{left:16px;right:16px;bottom:calc(84px + env(safe-area-inset-bottom));max-width:none}
  dialog.help-dialog{width:100%;box-shadow:none}
  .help-body{padding:16px 16px 40px}
}
@media (max-width:480px){
  .speech-practice button{justify-self:stretch;width:100%}
}
.attention{justify-self:start;padding:2px 10px;border-radius:999px;background:var(--amber-soft);color:var(--amber);font-size:13px;font-weight:600}

/* ===== Instância paga (navegação em 4 áreas, acesso, compra, administração). Só usa os tokens existentes. ===== */
.tabs-bar{display:flex;flex-wrap:wrap;gap:4px;padding:4px;margin:0 0 16px;border:1px solid var(--line);border-radius:var(--r-control);background:var(--cloud)}
.tab-item{flex:1 1 auto;min-height:44px;padding:8px 14px;border:0;border-radius:8px;background:transparent;color:var(--muted);font:inherit;font-weight:500;text-align:center;cursor:pointer}
.tab-item:hover{color:var(--tarmac);text-decoration:none}
.tab-item.active{background:var(--paper);color:var(--tarmac);font-weight:600;box-shadow:0 1px 2px rgba(7,43,95,.12)}
.tab-item:focus-visible{outline:3px solid var(--sky);outline-offset:2px}
.area-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:18px;margin-top:18px}
.area-card{display:flex;flex-direction:column;gap:8px;padding:22px;border:1px solid var(--line);border-radius:var(--r-panel);background:var(--paper);color:var(--ink)}
.area-card:hover{border-color:var(--sky);text-decoration:none}
.area-card strong{font-family:var(--font-display);font-size:22px;color:var(--tarmac)}
.area-icon{display:inline-flex;width:40px;height:40px;align-items:center;justify-content:center;border-radius:10px;background:var(--sky-soft);color:var(--sky)}
.home-next .button{margin-top:12px;align-self:flex-start}
.expiry-banner{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:12px;margin-bottom:16px;border-left:4px solid var(--amber);background:var(--amber-soft)}
.locked-actions{display:flex;flex-wrap:wrap;gap:12px;margin:8px 0 20px}
.feature-list{margin:0;padding-left:20px;display:grid;gap:6px}
.review-targets{margin:0;padding-left:20px;display:grid;gap:8px}
.price-summary{display:grid;grid-template-columns:1fr auto;gap:8px 16px;margin:0}
.price-summary dt{color:var(--muted)}.price-summary dd{margin:0;text-align:right;font-weight:600}
.price-summary .discount{color:var(--clear)}
.price-summary .total{padding-top:8px;border-top:1px solid var(--line);font-size:20px;color:var(--tarmac)}
.check{display:flex;gap:10px;align-items:flex-start;line-height:1.4}
.check input{width:20px;height:20px;margin-top:2px;flex:none}
.reading-passage{padding:14px 16px;margin:4px 0 12px;border-left:4px solid var(--sky);border-radius:0 var(--r-control) var(--r-control) 0;background:var(--sky-soft);white-space:pre-line}
.reading-passage .eyebrow{margin:0 0 6px}
.commerce-stats{margin-bottom:16px}
.admin-tabs .tab-item{flex:0 1 auto}
@media (max-width:767px){
  .area-grid{grid-template-columns:1fr;gap:14px}
  .area-card{padding:18px}
  .tabs-bar{flex-direction:column}
}
.home-next .button.primary{background:var(--paper);color:var(--tarmac);border-color:var(--paper)}
.exercise-prompt{white-space:pre-line}