*,
*::before,
*::after {
  box-sizing: border-box;
}

:root {
  --cor-primaria: #1a6b4a;
  --cor-primaria-escura: #145239;
  --cor-destaque: #e8a317;
  --cor-texto: #1c1c1c;
  --cor-texto-suave: #5a5a5a;
  --cor-borda: #dde3df;
  --cor-fundo: #f6f8f7;
  --cor-card: #ffffff;
  --sombra: 0 1px 3px rgba(0, 0, 0, 0.06), 0 4px 12px rgba(0, 0, 0, 0.04);
  --raio: 8px;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  font-size: 16px;
  line-height: 1.6;
  color: var(--cor-texto);
  background: var(--cor-fundo);
}

a {
  color: var(--cor-primaria);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

.container {
  max-width: 1080px;
  margin: 0 auto;
  padding: 0 1.25rem;
}

/* Header */
.site-header {
  background: var(--cor-card);
  border-bottom: 1px solid var(--cor-borda);
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 60px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  text-decoration: none;
  color: var(--cor-texto);
}

.logo:hover {
  text-decoration: none;
}

.logo-icon {
  font-size: 1.4rem;
  line-height: 1;
}

.logo-text {
  font-size: 1.15rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.logo-text em {
  font-style: normal;
  color: var(--cor-primaria);
  font-weight: 600;
}

.header-nav {
  display: none;
  gap: 1.25rem;
}

.header-nav a {
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--cor-texto-suave);
  text-decoration: none;
}

.header-nav a:hover {
  color: var(--cor-primaria);
  text-decoration: none;
}

/* Hero */
.hero {
  background: linear-gradient(135deg, var(--cor-primaria) 0%, var(--cor-primaria-escura) 100%);
  color: #fff;
  padding: 2.5rem 0 2.75rem;
}

.hero-tag {
  display: inline-block;
  margin: 0 0 0.75rem;
  padding: 0.2rem 0.65rem;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  background: rgba(255, 255, 255, 0.15);
  border-radius: 4px;
}

.hero h1 {
  margin: 0 0 0.75rem;
  font-size: 1.75rem;
  font-weight: 700;
  line-height: 1.25;
  max-width: 520px;
}

.hero-desc {
  margin: 0;
  font-size: 1rem;
  opacity: 0.9;
  max-width: 560px;
  line-height: 1.55;
}

/* Layout principal */
.main-wrap {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
  padding-top: 1.75rem;
  padding-bottom: 2.5rem;
}

.sidebar {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.sidebar-title {
  display: none;
}

.nav-btn {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  font-family: inherit;
  font-size: 0.82rem;
  font-weight: 500;
  padding: 0.55rem 0.85rem;
  border: 1px solid var(--cor-borda);
  border-radius: var(--raio);
  background: var(--cor-card);
  color: var(--cor-texto-suave);
  cursor: pointer;
  transition: border-color 0.15s, color 0.15s, background 0.15s;
}

.nav-btn:hover {
  border-color: var(--cor-primaria);
  color: var(--cor-primaria);
}

.nav-btn.active {
  background: var(--cor-primaria);
  border-color: var(--cor-primaria);
  color: #fff;
}

.nav-icon {
  font-size: 0.95rem;
}

/* Conteúdo / tabs */
main {
  background: var(--cor-card);
  border: 1px solid var(--cor-borda);
  border-radius: var(--raio);
  box-shadow: var(--sombra);
  padding: 1.75rem;
  min-height: 420px;
}

.tab {
  display: none;
}

.tab.active {
  display: block;
}

.tab-header {
  margin-bottom: 1.5rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--cor-borda);
}

.tab-header h2 {
  margin: 0 0 0.35rem;
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--cor-texto);
}

.tab-header p {
  margin: 0;
  font-size: 0.9rem;
  color: var(--cor-texto-suave);
}

/* Formulários */
.calc-form {
  max-width: 640px;
}

.field-row {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0 1rem;
}

.field {
  margin-bottom: 1rem;
}

label {
  display: block;
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--cor-texto);
  margin-bottom: 0.35rem;
}

.checkbox-label {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  font-weight: 500;
  cursor: pointer;
}

input[type="number"],
input[type="text"],
select {
  width: 100%;
  padding: 0.6rem 0.75rem;
  font-size: 0.95rem;
  font-family: inherit;
  border: 1px solid var(--cor-borda);
  border-radius: 6px;
  background: var(--cor-fundo);
  color: var(--cor-texto);
  transition: border-color 0.15s, box-shadow 0.15s;
}

input:focus,
select:focus {
  outline: none;
  border-color: var(--cor-primaria);
  box-shadow: 0 0 0 3px rgba(26, 107, 74, 0.12);
}

.hint {
  display: block;
  font-size: 0.75rem;
  color: var(--cor-texto-suave);
  margin-top: 0.25rem;
}

.btn-calc {
  font-family: inherit;
  font-size: 0.9rem;
  font-weight: 600;
  padding: 0.7rem 1.5rem;
  background: var(--cor-primaria);
  color: #fff;
  border: none;
  border-radius: 6px;
  cursor: pointer;
  margin-top: 0.25rem;
  transition: background 0.15s;
}

.btn-calc:hover {
  background: var(--cor-primaria-escura);
}

/* Resultado */
.resultado {
  margin-top: 1.5rem;
  padding: 1.25rem;
  background: var(--cor-fundo);
  border: 1px solid var(--cor-borda);
  border-radius: var(--raio);
  font-size: 0.88rem;
}

.resultado .total {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--cor-primaria);
  margin-top: 1rem;
  padding-top: 0.75rem;
  border-top: 1px solid var(--cor-borda);
}

.resultado dl {
  margin: 0;
  display: grid;
  gap: 0.5rem;
}

.resultado dt {
  color: var(--cor-texto-suave);
  font-size: 0.8rem;
}

.resultado dd {
  margin: 0 0 0.25rem;
  font-weight: 600;
  font-size: 0.95rem;
}

/* Info section */
.info-section {
  background: var(--cor-card);
  border-top: 1px solid var(--cor-borda);
  padding: 2.5rem 0;
}

.info-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
}

.info-grid h3 {
  margin: 0 0 0.4rem;
  font-size: 0.95rem;
  font-weight: 700;
}

.info-grid p {
  margin: 0;
  font-size: 0.85rem;
  color: var(--cor-texto-suave);
  line-height: 1.55;
}

/* Footer */
.site-footer {
  background: #1e2422;
  color: #a8b5af;
  padding: 2.5rem 0;
}

.footer-inner {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
}

.logo-footer .logo-text {
  color: #fff;
}

.logo-footer .logo-text em {
  color: #6fcf97;
}

.footer-brand p {
  margin: 0.5rem 0 0;
  font-size: 0.85rem;
}

.footer-heading {
  margin: 0 0 0.6rem;
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: #fff;
}

.footer-links {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.footer-links a {
  font-size: 0.85rem;
  color: #a8b5af;
  text-decoration: none;
}

.footer-links a:hover {
  color: #fff;
}

.footer-legal p {
  margin: 0;
  font-size: 0.78rem;
}

.disclaimer {
  margin-top: 0.5rem !important;
  opacity: 0.7;
}

/* Responsivo */
@media (min-width: 640px) {
  .field-row {
    grid-template-columns: 1fr 1fr;
  }

  .info-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .footer-inner {
    grid-template-columns: 2fr 1fr 2fr;
  }
}

@media (min-width: 768px) {
  .header-nav {
    display: flex;
  }

  .hero h1 {
    font-size: 2.1rem;
  }

  .main-wrap {
    grid-template-columns: 220px 1fr;
    align-items: start;
  }

  .sidebar {
    flex-direction: column;
    flex-wrap: nowrap;
    position: sticky;
    top: 76px;
  }

  .sidebar-title {
    display: block;
    margin: 0 0 0.5rem;
    padding-left: 0.5rem;
    font-size: 0.72rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: var(--cor-texto-suave);
  }

  .nav-btn {
    width: 100%;
    justify-content: flex-start;
    border-radius: 6px;
  }
}