/* Curso Master Aviator - Estilos Específicos */
/* Variáveis de cores */
:root {
  --bg: #0a0a0f;
  --fg: #f8fafc;
  --crimson: #d1121f;
  --card-bg: rgba(255,255,255,0.03);
  --border: rgba(255,255,255,0.12);
}

/* Base layout */
*{box-sizing:border-box}
html,body{height:100%;background:#0a0a0f}
body{margin:0;font-family:'Inter',system-ui,-apple-system,Segoe UI,Roboto,Ubuntu,'Helvetica Neue',Arial,'Noto Sans',sans-serif;background:#0a0a0f;color:#f8fafc}

/* Top bar */
.topbar{position:sticky;top:0;z-index:50;display:flex;align-items:center;justify-content:space-between;padding:12px 16px;background:rgba(17,17,17,.92);backdrop-filter:blur(10px);border-bottom:1px solid rgba(255,255,255,.12)}
.brand{font-weight:700;letter-spacing:.3px;font-size:1.1rem}
.top-actions{display:flex;align-items:center;gap:10px}
.top-actions button{background:rgba(255,255,255,.1);color:var(--fg);border:1px solid rgba(255,255,255,.2);padding:8px 14px;border-radius:12px;cursor:pointer;font-weight:600;font-size:.92rem;transition:background .2s ease,border-color .2s ease,transform .2s ease}
.top-actions button:hover{background:rgba(255,255,255,.18);border-color:rgba(255,255,255,.3);transform:translateY(-1px)}
.top-actions button:active{transform:scale(.97)}

.toggle-sidebar-btn{display:inline-flex;align-items:center;gap:6px}

/* Sidebar – base styles reused on desktop */
.sidebar{background:rgba(18,22,32,.95);border-right:1px solid rgba(255,255,255,.12);padding:24px 20px;display:flex;flex-direction:column;gap:20px}
.sidebar h2{font-size:.82rem;letter-spacing:.14em;text-transform:uppercase;margin:0;color:rgba(255,255,255,.58)}
.sidebar ul{list-style:none;padding:0;margin:0;display:flex;flex-direction:column;gap:6px;overflow-y:auto}
.sidebar li{margin:0}
.sidebar a{display:flex;align-items:center;gap:10px;padding:10px 14px;border-radius:12px;text-decoration:none;color:#f5f5f5;font-size:.95rem;border:1px solid transparent;background:rgba(255,255,255,.05);transition:background .2s ease,border-color .2s ease,color .2s ease}
.sidebar a:hover{background:rgba(255,255,255,.12);border-color:rgba(255,255,255,.2)}
.sidebar a.active{background:rgba(209,18,31,.2);border-color:rgba(209,18,31,.5);color:#fff;box-shadow:0 0 18px rgba(209,18,31,.25)}
.sidebar ul ul{gap:4px;padding-left:18px}
.sidebar ul ul a{font-size:.9rem;background:rgba(255,255,255,.03)}
.sidebar ul ul a.active{background:rgba(209,18,31,.18)}
.sidebar-empty{padding:12px 14px;border-radius:12px;background:rgba(255,255,255,.04);color:rgba(255,255,255,.6);font-size:.9rem}
.sidebar-close{display:none}

/* Mobile / tablet behavior */
.layout{display:block;min-height:calc(100vh - 60px)}
.sidebar{position:fixed;top:0;bottom:0;left:0;width:78vw;max-width:340px;transform:translateX(-100%);transition:transform .28s ease;z-index:60;padding:24px 18px 32px}
.sidebar--open{transform:none}
.sidebar-close{display:inline-flex;align-items:center;justify-content:center;width:38px;height:38px;border-radius:50%;border:1px solid rgba(255,255,255,.18);background:rgba(255,255,255,.08);color:#fff;font-size:1.5rem;cursor:pointer;transition:background .2s ease,border-color .2s ease,transform .2s ease}
.sidebar-close:hover{background:rgba(255,255,255,.16);border-color:rgba(255,255,255,.26);transform:scale(1.05)}
.sidebar-header{display:flex;align-items:center;justify-content:space-between;gap:8px}

.sidebar-scrim{position:fixed;inset:0;background:rgba(0,0,0,.65);backdrop-filter:blur(4px);z-index:55;opacity:0;pointer-events:none;transition:opacity .28s ease}
.sidebar-scrim.is-visible{opacity:1;pointer-events:auto}

.content{padding:22px 18px 64px;width:100%;overflow-x:hidden}
.content article{max-width:920px;margin:0 auto;width:100%}

/* Lesson content */
#lessonTitle{margin:0 0 12px;font-size:30px;font-family:'Bebas Neue',system-ui;letter-spacing:.045em;max-width:100%}
.lesson-body{display:grid;gap:18px;font-size:1.05rem;line-height:1.75;color:rgba(255,255,255,.85);max-width:100%;word-wrap:break-word}
.lesson-body p{margin:0;max-width:100%}
.lesson-body ul{margin:0;padding-left:20px;max-width:100%}
.lesson-body li{margin:6px 0}
.lesson-body h1,.lesson-body h2,.lesson-body h3,.lesson-body h4{max-width:100%;word-wrap:break-word;line-height:1.3;margin:24px 0 12px}
.lesson-block-unsupported{padding:14px 16px;border:1px dashed rgba(148,163,184,.38);border-radius:12px;background:rgba(16,24,36,.7);color:#cbd5f5;font-size:.9rem}
.lesson-figure{margin:10px 0;border:1px solid rgba(255,255,255,.1);border-radius:18px;overflow:hidden;background:rgba(15,17,26,.78);box-shadow:0 16px 32px rgba(0,0,0,.32)}
.lesson-figure img{width:100%;display:block;height:auto}
.lesson-figure figcaption{font-size:.78rem;color:rgba(255,255,255,.68);padding:10px 14px;border-top:1px solid rgba(255,255,255,.1)}

.nav-buttons{display:grid;grid-template-columns:1fr;gap:12px;margin:28px 0}
.nav-buttons button{width:100%;background:linear-gradient(180deg,#ff3131,var(--crimson));border:none;color:#fff;padding:12px 18px;border-radius:14px;cursor:pointer;font-weight:700;font-size:1rem;box-shadow:0 10px 28px rgba(209,18,31,.35);transition:transform .2s ease,box-shadow .2s ease}
.nav-buttons button:hover{transform:translateY(-1px);box-shadow:0 14px 34px rgba(209,18,31,.45)}
.nav-buttons button.ghost{background:rgba(255,255,255,.12);color:#dbeafe;border:1px solid rgba(255,255,255,.22);box-shadow:none}
.nav-buttons button:disabled{opacity:.58;cursor:not-allowed;box-shadow:none;transform:none}

.progress{height:10px;background:rgba(255,255,255,.08);border-radius:999px;overflow:hidden;border:1px solid rgba(255,255,255,.14)}
#progressBar{height:100%;width:0;background:linear-gradient(90deg,#22c55e,#4ade80);transition:width .3s ease}

.foot{padding:18px;border-top:1px solid rgba(255,255,255,.08);background:rgba(15,17,26,.95);color:rgba(255,255,255,.6);font-size:.8rem;text-align:center}
code,kbd{background:#111827;padding:2px 6px;border-radius:6px;border:1px solid #293347}

/* Tablet adjustments */
@media (min-width:600px){
  .content{padding:26px 26px 70px}
  #lessonTitle{font-size:34px}
  .nav-buttons{grid-template-columns:repeat(2,minmax(0,1fr))}
}

/* Desktop layout */
@media (min-width:960px){
  .layout{display:grid;grid-template-columns:300px 1fr;min-height:calc(100vh - 60px);overflow:hidden}
  .sidebar{position:relative;transform:none;width:100%;max-width:none;padding:28px 22px;overflow-y:auto}
  .sidebar-close{display:none}
  .sidebar-scrim{display:none}
  .toggle-sidebar-btn{display:none}
  .content{padding:40px 44px 80px;overflow-y:auto;overflow-x:hidden;max-width:100%}
  .content article{max-width:800px}
  #lessonTitle{font-size:40px}
  .lesson-body{font-size:1.1rem}
  .nav-buttons{grid-template-columns:auto auto;justify-content:flex-start}
  .nav-buttons button{min-width:180px}
}