:root {
  --color-bg: #fafaf8;
  --color-surface: #ffffff;
  --color-surface-2: #f3f2ee;
  --color-surface-3: #ebeae5;
  --color-text: #1a1a18;
  --color-text-secondary: #5f5f5a;
  --color-text-tertiary: #8a8a85;
  --color-border: rgba(0,0,0,0.08);
  --color-border-strong: rgba(0,0,0,0.16);
  --color-info: #185FA5;
  --color-info-bg: #E6F1FB;
  --color-info-soft: rgba(24,95,165,0.10);
  --color-success: #3B6D11;
  --color-success-bg: #ECF2E1;
  --color-warning: #BA7517;
  --color-warning-bg: #FBF1E0;
  --color-danger: #A32D2D;
  --color-coral: #D85A30;
  --color-coral-dark: #C84A22;
  --color-coral-light: #E97B57;
  --color-coral-bg: #FAECE7;
  --color-teal: #0F6E56;
  --color-purple: #534AB7;

  --font-sans: -apple-system, BlinkMacSystemFont, "Inter", "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono: ui-monospace, "SF Mono", "JetBrains Mono", Menlo, Consolas, monospace;

  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 14px;
  --radius-xl: 20px;

  --shadow-xs: 0 1px 2px rgba(0,0,0,0.04);
  --shadow-sm: 0 2px 4px rgba(0,0,0,0.04), 0 1px 2px rgba(0,0,0,0.03);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.05), 0 2px 4px rgba(0,0,0,0.04);
  --shadow-lg: 0 12px 32px rgba(0,0,0,0.08), 0 4px 8px rgba(0,0,0,0.04);

  --sidebar-w: 244px;
  --topbar-h: 60px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --color-bg: #161614;
    --color-surface: #1f1f1c;
    --color-surface-2: #25251f;
    --color-surface-3: #2c2c25;
    --color-text: #f3f2eb;
    --color-text-secondary: #b6b4ab;
    --color-text-tertiary: #8a8980;
    --color-border: rgba(255,255,255,0.08);
    --color-border-strong: rgba(255,255,255,0.16);
    --color-info-bg: rgba(24,95,165,0.18);
    --color-info-soft: rgba(24,95,165,0.10);
    --color-success-bg: rgba(99,153,34,0.14);
    --color-warning-bg: rgba(186,117,23,0.14);
    --color-coral-bg: rgba(216,90,48,0.14);
    --shadow-md: 0 4px 12px rgba(0,0,0,0.32), 0 2px 4px rgba(0,0,0,0.18);
    --shadow-lg: 0 12px 32px rgba(0,0,0,0.40), 0 4px 8px rgba(0,0,0,0.20);
  }
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  font-family: var(--font-sans);
  background: var(--color-bg);
  color: var(--color-text);
  font-size: 14.5px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

a { color: var(--color-info); text-decoration: none; }
a:hover { text-decoration: underline; }
code, kbd, .mono { font-family: var(--font-mono); font-size: 0.92em; }

.app {
  display: grid;
  grid-template-columns: var(--sidebar-w) 1fr;
  min-height: 100vh;
}

.sidebar {
  background: var(--color-surface);
  border-right: 1px solid var(--color-border);
  position: sticky;
  top: 0;
  height: 100vh;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  padding: 18px 16px;
  gap: 6px;
  z-index: 30;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 4px 4px 14px;
  text-decoration: none;
  color: var(--color-text);
  border-bottom: 1px solid var(--color-border);
  margin-bottom: 12px;
}
.brand:hover { text-decoration: none; }
.brand-mark {
  width: 30px;
  height: 30px;
  flex-shrink: 0;
  border-radius: 7px;
  overflow: hidden;
  box-shadow: var(--shadow-xs);
}
.brand-mark svg { display: block; width: 100%; height: 100%; }
.brand-name { font-size: 16px; font-weight: 600; letter-spacing: -0.01em; }
.brand-tag { font-size: 10px; color: var(--color-text-tertiary); font-family: var(--font-mono); margin-top: -2px; }

.nav-group { padding: 6px 0 2px; }
.nav-group-label {
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-text-tertiary);
  font-family: var(--font-mono);
  padding: 0 8px 6px;
  font-weight: 500;
}
.nav-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 7px 8px;
  border-radius: var(--radius-sm);
  font-size: 13px;
  color: var(--color-text-secondary);
  text-decoration: none;
  transition: background 0.12s, color 0.12s;
  line-height: 1.3;
}
.nav-item:hover { background: var(--color-surface-2); color: var(--color-text); text-decoration: none; }
.nav-item.active { background: var(--color-coral-bg); color: var(--color-coral-dark); font-weight: 500; }
@media (prefers-color-scheme: dark) {
  .nav-item.active { color: var(--color-coral-light); }
}
.nav-item .num {
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--color-text-tertiary);
  background: var(--color-surface-2);
  padding: 2px 6px;
  border-radius: 4px;
  min-width: 22px;
  text-align: center;
}
.nav-item.active .num { background: transparent; color: inherit; opacity: 0.8; }
.nav-item .lbl { flex: 1; min-width: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }

.sidebar-footer {
  margin-top: auto;
  padding-top: 14px;
  border-top: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  gap: 8px;
}
.lang-toggle {
  background: var(--color-surface-2);
  border: 0;
  border-radius: var(--radius-sm);
  padding: 6px 10px;
  font-size: 12px;
  font-family: var(--font-mono);
  color: var(--color-text);
  cursor: pointer;
  font-weight: 500;
  transition: background 0.12s;
}
.lang-toggle:hover { background: var(--color-surface-3); }

.main {
  min-width: 0;
  display: flex;
  flex-direction: column;
}

.topbar {
  display: none;
}

.page {
  padding: 32px 40px 80px;
  max-width: 1100px;
  width: 100%;
}

.menu-btn { display: none; background: none; border: 0; padding: 4px; color: var(--color-text); cursor: pointer; }
.menu-btn i { font-size: 22px; }

.module-header { margin-bottom: 28px; }
.module-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 11px;
  font-family: var(--font-mono);
  color: var(--color-coral-dark);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 10px;
  background: var(--color-coral-bg);
  padding: 3px 9px;
  border-radius: 999px;
}
@media (prefers-color-scheme: dark) { .module-eyebrow { color: var(--color-coral-light); } }
.module-title {
  font-size: 30px;
  font-weight: 600;
  margin: 0 0 8px;
  letter-spacing: -0.02em;
  line-height: 1.15;
}
.module-subtitle {
  font-size: 15px;
  color: var(--color-text-secondary);
  max-width: 720px;
  margin: 0;
  line-height: 1.55;
}

.section { margin-bottom: 22px; }
.section h2 {
  font-size: 16px;
  font-weight: 600;
  margin: 0 0 10px;
  letter-spacing: -0.01em;
}
.section h3 { font-size: 14px; font-weight: 600; margin: 14px 0 6px; }
.section p { margin: 0 0 10px; max-width: 720px; }
.section ul, .section ol { margin: 0 0 10px; padding-left: 20px; max-width: 720px; }
.section li { margin-bottom: 4px; }

.panel {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 16px 20px;
  box-shadow: var(--shadow-xs);
}
.panel.accent-info { border-left: 3px solid var(--color-info); }
.panel.accent-success { border-left: 3px solid var(--color-success); }
.panel.accent-warning { border-left: 3px solid var(--color-warning); }
.panel.accent-coral { border-left: 3px solid var(--color-coral); }
.panel.compact { padding: 12px 16px; }
.panel-title {
  font-size: 13px;
  font-weight: 600;
  margin: 0 0 6px;
  display: flex;
  align-items: center;
  gap: 7px;
}
.panel-title i { color: var(--color-text-tertiary); font-size: 16px; }
.panel p { font-size: 13.5px; margin: 0 0 8px; }
.panel p:last-child { margin-bottom: 0; }
.panel ul { font-size: 13.5px; margin: 4px 0; padding-left: 18px; }
.panel ul li { margin-bottom: 4px; }

details.dt {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  margin-bottom: 8px;
  font-size: 13.5px;
}
details.dt > summary {
  list-style: none;
  cursor: pointer;
  padding: 10px 14px;
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: 500;
  color: var(--color-text);
}
details.dt > summary::-webkit-details-marker { display: none; }
details.dt > summary::before {
  content: "+";
  font-family: var(--font-mono);
  color: var(--color-text-tertiary);
  font-size: 14px;
  width: 14px;
  transition: transform 0.15s;
}
details.dt[open] > summary::before { content: "−"; }
details.dt[open] > summary { border-bottom: 1px solid var(--color-border); }
details.dt > div { padding: 12px 14px 14px 36px; color: var(--color-text-secondary); }
details.dt > div p { margin: 0 0 8px; }
details.dt > div p:last-child { margin-bottom: 0; }
details.dt > div ul { padding-left: 18px; margin: 4px 0; }

.simulator-frame {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: 22px;
  margin: 22px 0;
  box-shadow: var(--shadow-sm);
  position: relative;
}
.simulator-toolbar {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 16px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--color-border);
}
.simulator-toolbar .live {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 11px;
  font-family: var(--font-mono);
  color: var(--color-text-secondary);
}
.simulator-toolbar .live .dot {
  width: 7px;
  height: 7px;
  background: var(--color-success);
  border-radius: 50%;
  animation: liveBlink 1.6s ease-in-out infinite;
}
@keyframes liveBlink {
  0%, 100% { opacity: 0.4; transform: scale(1); }
  50% { opacity: 1; transform: scale(1.15); }
}
.simulator-toolbar .spacer { flex: 1; }

.btn {
  background: transparent;
  border: 1px solid var(--color-border-strong);
  color: var(--color-text);
  padding: 5px 11px;
  border-radius: var(--radius-sm);
  font-size: 12px;
  cursor: pointer;
  font-family: var(--font-sans);
  display: inline-flex;
  align-items: center;
  gap: 5px;
  transition: background 0.12s, transform 0.12s;
  font-weight: 500;
}
.btn:hover { background: var(--color-surface-2); }
.btn:active { transform: scale(0.97); }
.btn i { font-size: 14px; }
.btn.primary {
  background: var(--color-coral);
  color: white;
  border-color: var(--color-coral);
}
.btn.primary:hover { background: var(--color-coral-dark); }
.btn.ghost { border-color: transparent; padding: 5px 8px; color: var(--color-text-secondary); }
.btn.ghost:hover { background: var(--color-surface-2); color: var(--color-text); }

.metric-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 12px;
  margin-bottom: 14px;
}
.metric {
  background: linear-gradient(180deg, var(--color-surface) 0%, var(--color-surface-2) 100%);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 12px 14px;
  position: relative;
  overflow: hidden;
}
.metric.accent::before {
  content: "";
  position: absolute;
  left: 0; top: 0; bottom: 0;
  width: 3px;
  background: var(--color-coral);
}
.metric.accent-info::before { content: ""; position: absolute; left: 0; top: 0; bottom: 0; width: 3px; background: var(--color-info); }
.metric.accent-success::before { content: ""; position: absolute; left: 0; top: 0; bottom: 0; width: 3px; background: var(--color-success); }
.metric.accent-warning::before { content: ""; position: absolute; left: 0; top: 0; bottom: 0; width: 3px; background: var(--color-warning); }
.metric .lbl {
  font-size: 11px;
  color: var(--color-text-secondary);
  margin-bottom: 4px;
  font-weight: 500;
  display: flex;
  align-items: center;
  gap: 4px;
}
.metric .val {
  font-size: 22px;
  font-weight: 600;
  font-family: var(--font-mono);
  letter-spacing: -0.02em;
  color: var(--color-text);
}
.metric .unit { font-size: 11px; color: var(--color-text-secondary); margin-left: 3px; font-weight: 400; font-family: var(--font-sans); }
.metric .diff {
  font-size: 11px;
  margin-top: 4px;
  font-family: var(--font-mono);
  color: var(--color-text-secondary);
}
.metric .diff.ok { color: var(--color-success); }
.metric .diff.warn { color: var(--color-warning); }
.metric .diff.bad { color: var(--color-danger); }

.trace-card {
  background: var(--color-surface-2);
  border-radius: var(--radius-md);
  padding: 8px 12px;
  margin-bottom: 8px;
}
.trace-hdr {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  margin-bottom: 4px;
}
.trace-name { font-size: 12px; font-weight: 500; }
.trace-spec { font-size: 10px; color: var(--color-text-tertiary); font-family: var(--font-mono); }

.chip {
  display: inline-flex;
  align-items: center;
  padding: 3px 9px;
  font-size: 11px;
  font-family: var(--font-mono);
  background: var(--color-surface-2);
  color: var(--color-text-secondary);
  border-radius: 999px;
  gap: 4px;
}
.chip.coral { background: var(--color-coral-bg); color: var(--color-coral-dark); }
.chip.info { background: var(--color-info-bg); color: var(--color-info); }
.chip.success { background: var(--color-success-bg); color: var(--color-success); }

.hero {
  background: linear-gradient(135deg, var(--color-surface) 0%, var(--color-coral-bg) 100%);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: 32px 36px;
  margin-bottom: 24px;
  position: relative;
  overflow: hidden;
}
@media (prefers-color-scheme: dark) {
  .hero { background: linear-gradient(135deg, var(--color-surface) 0%, var(--color-surface-2) 100%); }
}
.hero h1 {
  font-size: 34px;
  font-weight: 600;
  margin: 0 0 10px;
  letter-spacing: -0.025em;
  line-height: 1.1;
  max-width: 600px;
}
.hero .sub {
  font-size: 15px;
  color: var(--color-text-secondary);
  max-width: 560px;
  margin: 0 0 0;
}
.hero .chips { display: flex; flex-wrap: wrap; gap: 6px; margin-bottom: 14px; }

.kpi-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 12px;
  margin-bottom: 22px;
}
.kpi {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 14px 16px;
  position: relative;
  overflow: hidden;
}
.kpi .lbl { font-size: 11px; color: var(--color-text-secondary); font-weight: 500; margin-bottom: 4px; }
.kpi .val { font-size: 26px; font-weight: 600; font-family: var(--font-mono); letter-spacing: -0.025em; line-height: 1.1; }
.kpi .val .unit { font-size: 12px; color: var(--color-text-secondary); margin-left: 3px; font-weight: 400; font-family: var(--font-sans); }
.kpi .meta { font-size: 11px; color: var(--color-text-tertiary); margin-top: 4px; font-family: var(--font-mono); }

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 14px;
  margin-top: 18px;
}
.demo-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 18px 20px;
  text-decoration: none;
  color: var(--color-text);
  transition: transform 0.15s, box-shadow 0.15s, border-color 0.15s;
  display: block;
  position: relative;
  overflow: hidden;
}
.demo-card:hover {
  text-decoration: none;
  border-color: var(--color-coral);
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}
.demo-card .num {
  position: absolute;
  top: 14px;
  right: 16px;
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--color-text-tertiary);
  background: var(--color-surface-2);
  padding: 2px 8px;
  border-radius: 999px;
}
.demo-card .tag { font-size: 11px; font-family: var(--font-mono); color: var(--color-coral-dark); margin-bottom: 4px; text-transform: uppercase; letter-spacing: 0.06em; }
@media (prefers-color-scheme: dark) { .demo-card .tag { color: var(--color-coral-light); } }
.demo-card .ttl { font-size: 16px; font-weight: 600; margin-bottom: 6px; letter-spacing: -0.01em; }
.demo-card .desc { font-size: 13px; color: var(--color-text-secondary); line-height: 1.5; }

.footer-nav {
  display: flex;
  justify-content: space-between;
  align-items: stretch;
  margin-top: 40px;
  padding-top: 22px;
  border-top: 1px solid var(--color-border);
  gap: 14px;
}
.footer-nav .nav-link {
  display: flex;
  flex-direction: column;
  gap: 3px;
  padding: 12px 16px;
  border-radius: var(--radius-md);
  text-decoration: none;
  color: var(--color-text);
  border: 1px solid var(--color-border);
  background: var(--color-surface);
  transition: background 0.15s, border-color 0.15s;
  flex: 1;
  max-width: 320px;
  min-width: 0;
}
.footer-nav .nav-link:hover { background: var(--color-surface-2); border-color: var(--color-coral); text-decoration: none; }
.footer-nav .nav-link.next { align-items: flex-end; text-align: right; }
.footer-nav .nav-link .eyebrow { font-size: 11px; color: var(--color-text-secondary); font-family: var(--font-mono); }
.footer-nav .nav-link .label { font-size: 14px; font-weight: 500; }
.footer-nav .spacer { flex: 1; }

[data-lang-pt], [data-lang-en] { display: none; }
html[lang="pt"] [data-lang-pt],
html[lang="pt-BR"] [data-lang-pt],
html[lang="pt-br"] [data-lang-pt] { display: revert; }
html[lang="en"] [data-lang-en] { display: revert; }

.sidebar-overlay { display: none; }

@media (max-width: 900px) {
  .app { grid-template-columns: 1fr; }
  .sidebar {
    position: fixed;
    top: 0; left: 0; bottom: 0;
    width: 280px;
    transform: translateX(-100%);
    transition: transform 0.25s;
    box-shadow: var(--shadow-lg);
  }
  body.menu-open .sidebar { transform: translateX(0); }
  .sidebar-overlay {
    display: block;
    position: fixed;
    top: 0; left: 0; right: 0; bottom: 0;
    background: rgba(0,0,0,0.4);
    z-index: 29;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.2s, visibility 0.2s;
  }
  body.menu-open .sidebar-overlay { opacity: 1; visibility: visible; }
  .topbar {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 14px;
    background: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
    position: sticky;
    top: 0;
    z-index: 28;
  }
  .topbar .brand { padding: 0; border: 0; margin: 0; flex: 1; }
  .topbar .brand-mark { width: 26px; height: 26px; }
  .topbar .brand-name { font-size: 15px; }
  .topbar .brand-tag { display: none; }
  .menu-btn { display: inline-flex; align-items: center; }
  .page { padding: 20px 16px 60px; max-width: 100%; }
  .hero { padding: 22px 20px; }
  .hero h1 { font-size: 26px; }
  .module-title { font-size: 24px; }
  .footer-nav { flex-direction: column; }
  .footer-nav .nav-link { max-width: 100%; }
}

@media (max-width: 540px) {
  .page { padding: 18px 14px 50px; }
  .simulator-frame { padding: 16px; }
  .hero { padding: 18px 16px; }
}