:root{
  --bg:#F4F6FB;
  --surface:#FFFFFF;
  --surface-2:#F0F2F8;
  --border:#E4E8F1;
  --text:#151A2D;
  --text-dim:#6B7280;
  --brand:#2F6FED;
  --brand-dim:#EAF0FE;
  --radius:16px;
  --shadow:0 1px 2px rgba(16,24,40,.04), 0 2px 8px rgba(16,24,40,.06);
  --nav-w:96px;
}

*{box-sizing:border-box;margin:0;padding:0}
html,body{height:100%}
body{
  font-family:"Inter",system-ui,sans-serif;
  background:var(--bg);
  color:var(--text);
  -webkit-font-smoothing:antialiased;
}
h1,h2,h3,.brand-font{font-family:"Space Grotesk",Inter,sans-serif}
button{font-family:inherit;cursor:pointer;border:none;background:none;color:inherit}
a{color:inherit;text-decoration:none}
select{font-family:inherit}

.app-shell{
  display:flex;
  min-height:100vh;
}

/* ---------- NAV ---------- */
.app-nav{
  width:var(--nav-w);
  flex-shrink:0;
  background:var(--surface);
  border-right:1px solid var(--border);
  display:flex;
  flex-direction:column;
  align-items:center;
  padding:20px 0;
  position:sticky;
  top:0;
  height:100vh;
}
.nav-brand{
  display:flex;
  flex-direction:column;
  align-items:center;
  gap:8px;
  margin-bottom:28px;
}
.nav-logo{
  width:40px;height:40px;border-radius:12px;
  background:linear-gradient(135deg,var(--brand),#7A5AF8);
  color:#fff;display:flex;align-items:center;justify-content:center;
  font-weight:800;font-size:14px;font-family:"Space Grotesk",sans-serif;
}
.nav-title{
  font-size:11px;line-height:1.2;text-align:center;color:var(--text-dim);font-weight:600;
}
.nav-links{
  display:flex;
  flex-direction:column;
  gap:6px;
  width:100%;
  padding:0 10px;
}
.nav-link{
  display:flex;
  flex-direction:column;
  align-items:center;
  gap:5px;
  padding:10px 4px;
  border-radius:12px;
  font-size:10.5px;
  font-weight:600;
  color:var(--text-dim);
  text-align:center;
  transition:.15s;
}
.nav-link svg{width:20px;height:20px;stroke:currentColor}
.nav-link:hover{background:var(--surface-2);color:var(--text)}
.nav-link.active{background:var(--brand-dim);color:var(--brand)}

/* ---------- MAIN ---------- */
.app-main{
  flex:1;
  min-width:0;
  padding:24px 32px 100px;
  max-width:1100px;
}
.topbar{
  display:flex;
  align-items:center;
  justify-content:space-between;
  margin-bottom:24px;
  flex-wrap:wrap;
  gap:12px;
}
.topbar-title{
  font-family:"Space Grotesk",sans-serif;
  font-size:24px;
  font-weight:700;
}
.topbar-filter{
  display:flex;
  align-items:center;
  gap:8px;
  background:var(--surface);
  border:1px solid var(--border);
  padding:8px 12px;
  border-radius:12px;
  box-shadow:var(--shadow);
}
.topbar-filter label{font-size:12px;color:var(--text-dim);font-weight:600}
.topbar-filter select{
  border:none;background:none;font-size:13px;font-weight:600;color:var(--text);
  outline:none;
}

/* ---------- HERO ---------- */
.hero-card{
  background:linear-gradient(120deg,#1D4ED8,#7A5AF8);
  border-radius:20px;
  padding:28px;
  color:#fff;
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:20px;
  margin-bottom:32px;
  flex-wrap:wrap;
}
.hero-text h1{font-size:22px;margin-bottom:8px;max-width:420px}
.hero-text p{font-size:13.5px;opacity:.9;max-width:420px;line-height:1.5}
.hero-stat{
  background:rgba(255,255,255,.14);
  border-radius:16px;
  padding:16px 22px;
  text-align:center;
  min-width:110px;
}
.hero-stat-num{display:block;font-family:"Space Grotesk";font-size:32px;font-weight:700}
.hero-stat-label{font-size:11px;opacity:.85;font-weight:600}

.section-title{
  font-size:15px;
  font-weight:700;
  color:var(--text-dim);
  text-transform:uppercase;
  letter-spacing:.04em;
  margin-bottom:14px;
}

/* ---------- GRID DE TRILHAS ---------- */
.grid-trilhas{
  display:grid;
  grid-template-columns:repeat(auto-fill,minmax(240px,1fr));
  gap:16px;
}
.trilha-card{
  background:var(--surface);
  border:1px solid var(--border);
  border-radius:var(--radius);
  padding:20px;
  box-shadow:var(--shadow);
  cursor:pointer;
  transition:.15s;
  display:flex;
  flex-direction:column;
  gap:12px;
}
.trilha-card:hover{transform:translateY(-2px);box-shadow:0 4px 16px rgba(16,24,40,.1)}
.trilha-icon{
  width:44px;height:44px;border-radius:12px;
  display:flex;align-items:center;justify-content:center;
  font-size:18px;font-weight:800;color:#fff;
  font-family:"Space Grotesk";
}
.trilha-card h3{font-size:16px;margin-bottom:2px}
.trilha-card p{font-size:12.5px;color:var(--text-dim);line-height:1.4}
.trilha-meta{
  display:flex;align-items:center;justify-content:space-between;
  margin-top:auto;padding-top:10px;border-top:1px solid var(--border);
}
.tag{
  font-size:10.5px;font-weight:700;padding:4px 9px;border-radius:999px;
  background:var(--surface-2);color:var(--text-dim);
}
.progress-mini{font-size:11px;font-weight:700;color:var(--text-dim)}

/* ---------- TRILHA DETAIL ---------- */
.back-btn{
  font-size:13px;font-weight:600;color:var(--text-dim);margin-bottom:16px;
}
.back-btn:hover{color:var(--text)}
.trilha-header{
  display:flex;align-items:center;gap:16px;margin-bottom:24px;
  background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);
  padding:20px;box-shadow:var(--shadow);
}
.trilha-header h2{font-size:19px;margin-bottom:4px}
.trilha-header p{font-size:13px;color:var(--text-dim)}

.units-list{display:flex;flex-direction:column;gap:10px}
.unit-row{
  display:flex;align-items:center;gap:14px;
  background:var(--surface);border:1px solid var(--border);border-radius:14px;
  padding:14px 16px;box-shadow:var(--shadow);
}
.unit-row.locked{opacity:.55}
.unit-num{
  width:38px;height:38px;flex-shrink:0;border-radius:10px;
  background:var(--surface-2);display:flex;align-items:center;justify-content:center;
  font-weight:700;font-size:13px;color:var(--text-dim);
}
.unit-row.unlocked .unit-num{background:var(--brand-dim);color:var(--brand)}
.unit-info{flex:1;min-width:0}
.unit-info strong{display:block;font-size:14px;margin-bottom:2px}
.unit-info span{font-size:12px;color:var(--text-dim)}
.unit-actions{display:flex;gap:8px;flex-shrink:0}
.btn{
  font-size:12.5px;font-weight:700;padding:9px 14px;border-radius:10px;
  background:var(--brand);color:#fff;transition:.15s;white-space:nowrap;
}
.btn:hover{background:#1d4ed8}
.btn-outline{
  font-size:12.5px;font-weight:700;padding:9px 14px;border-radius:10px;
  background:var(--surface-2);color:var(--text-dim);
}
.lock-badge{font-size:11px;font-weight:700;color:var(--text-dim)}

.bonus-section{margin-top:28px}
.bonus-title{color:#B45309}
.bonus-row{border-color:#FDE7C4;background:#FFFBF2}
.bonus-num{background:#FEF0C7;color:#B45309}
@media (prefers-color-scheme: dark){
  :root:not(.light-forced) .bonus-row{background:#241C0F;border-color:#3A2A10}
}

/* ---------- PDF MODAL ---------- */
.pdf-modal{
  position:fixed;inset:0;background:#0B0F1A;z-index:100;
  display:none;flex-direction:column;
}
.pdf-modal.open{display:flex}
.pdf-modal-bar{
  display:flex;align-items:center;justify-content:space-between;
  padding:12px 18px;background:#151A2D;color:#fff;flex-shrink:0;
}
.pdf-modal-bar span{font-size:14px;font-weight:600}
.pdf-modal-actions{display:flex;gap:8px}
.btn-ghost{
  font-size:12.5px;font-weight:700;padding:8px 14px;border-radius:8px;
  background:rgba(255,255,255,.1);color:#fff;
}
.btn-ghost:hover{background:rgba(255,255,255,.18)}
.pdf-modal iframe{flex:1;border:none;width:100%;background:#fff}

/* ---------- RESPONSIVE ---------- */
@media (max-width:820px){
  .app-shell{flex-direction:column}
  .app-nav{
    position:fixed;bottom:0;left:0;right:0;top:auto;height:auto;width:100%;
    flex-direction:row;justify-content:space-around;padding:8px 4px;
    border-right:none;border-top:1px solid var(--border);z-index:50;
  }
  .nav-brand{display:none}
  .nav-links{flex-direction:row;justify-content:space-around;padding:0}
  .nav-link{font-size:9px;padding:6px 2px;flex:1}
  .nav-link span{display:none}
  .nav-link svg{width:22px;height:22px}
  .app-main{padding:18px 16px 90px;max-width:100%}
  .hero-card{padding:20px}
  .hero-text h1{font-size:19px}
  .topbar-title{font-size:20px}
}
@media (max-width:480px){
  .unit-row{flex-wrap:wrap}
  .unit-actions{width:100%;justify-content:flex-end}
}

/* ---------- THEME (dark support) ---------- */
@media (prefers-color-scheme: dark){
  :root:not(.light-forced){
    --bg:#0B0F1A;
    --surface:#131826;
    --surface-2:#1B2233;
    --border:#232B40;
    --text:#F2F4FA;
    --text-dim:#8B93A8;
    --brand-dim:#1B2748;
  }
}