:root {
  /* Paleta Oficial AgriCalc */
  --color-dark: #092328;       /* rgb(9, 35, 40) */
  --color-primary: #12544F;    /* rgb(18, 84, 79) */
  --color-medium: #2A835F;     /* rgb(42, 131, 95) */
  --color-light: #8BBB92;      /* rgb(139, 187, 146) */

  --color-bg: #F4F7F5;
  --color-card: #FFFFFF;
  --color-text: #092328;
  --color-muted: #4A635E;
  --color-border: #DCE5E0;
  --radius: 14px;

  /* Cores complementares — usadas em badges, alertas e destaques secundários
     das calculadoras internas (mantidas dentro da mesma temperatura de cor). */
  --color-accent: #8C5A3C;     /* Argila — indicadores / textos secundários */
  --color-alert: #B34A26;      /* Alerta — avisos e valores fora da faixa */
  --radius-sm: 8px;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

body {
  background-color: var(--color-bg);
  color: var(--color-text);
  font-family: 'IBM Plex Sans', sans-serif;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

.container {
  max-width: 1180px;
  margin: 0 auto;
  padding: 0 20px;
}

/* ==========================================================================
   HEADER / NAVBAR (compartilhado por todas as páginas)
   ========================================================================== */
header {
  background: var(--color-card);
  border-bottom: 1px solid var(--color-border);
  position: sticky;
  top: 0;
  z-index: 100;
}
.nav-wrap {
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 72px;
}
.brand {
  font-size: 24px;
  font-weight: 700;
  color: var(--color-dark);
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: 8px;
  letter-spacing: -0.02em;
}
.brand span { color: var(--color-medium); }
nav ul { display: flex; list-style: none; gap: 28px; }
nav a {
  text-decoration: none;
  color: var(--color-text);
  font-weight: 500;
  font-size: 15px;
  transition: color 0.2s;
}
nav a:hover { color: var(--color-medium); }

.btn-back {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--color-medium);
  text-decoration: none;
  font-weight: 600;
  font-size: 14px;
  transition: color 0.2s;
}
.btn-back:hover { color: var(--color-primary); }

/* ==========================================================================
   HERO (página inicial)
   ========================================================================== */
.hero {
  padding: 70px 0 60px 0;
  text-align: center;
  background: linear-gradient(180deg, rgba(139, 187, 146, 0.22) 0%, rgba(244, 247, 245, 0.4) 100%);
  border-bottom: 1px solid var(--color-border);
}
.hero-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-family: 'IBM Plex Mono', monospace;
  font-size: 12px;
  background: rgba(42, 131, 95, 0.12);
  color: var(--color-primary);
  padding: 6px 16px;
  border-radius: 20px;
  margin-bottom: 20px;
  text-transform: uppercase;
  font-weight: 600;
  border: 1px solid rgba(42, 131, 95, 0.25);
}
.hero h1 {
  font-size: clamp(34px, 5.5vw, 52px);
  font-weight: 700;
  color: var(--color-dark);
  margin-bottom: 18px;
  line-height: 1.15;
  letter-spacing: -0.02em;
}
.hero p {
  font-size: 19px;
  color: var(--color-muted);
  max-width: 720px;
  margin: 0 auto 36px auto;
}

.search-wrapper { max-width: 640px; margin: 0 auto; }
.search-box {
  display: flex;
  align-items: center;
  background: var(--color-card);
  border: 2px solid var(--color-border);
  border-radius: 40px;
  padding: 6px 8px 6px 20px;
  box-shadow: 0 8px 24px rgba(9, 35, 40, 0.07);
  transition: all 0.2s ease;
}
.search-box:focus-within {
  border-color: var(--color-medium);
  box-shadow: 0 8px 30px rgba(42, 131, 95, 0.18);
}
.search-box input {
  width: 100%;
  border: none;
  outline: none;
  font-size: 16px;
  background: transparent;
  color: var(--color-dark);
  font-family: 'IBM Plex Sans', sans-serif;
}
.search-btn {
  background: var(--color-medium);
  color: white;
  border: none;
  padding: 12px 24px;
  border-radius: 30px;
  font-weight: 600;
  cursor: pointer;
  font-size: 14px;
  transition: background 0.2s;
}
.search-btn:hover { background: var(--color-primary); }

.quick-filters {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 20px;
}
.chip {
  background: rgba(255, 255, 255, 0.8);
  border: 1px solid var(--color-border);
  padding: 6px 14px;
  border-radius: 20px;
  font-size: 13px;
  color: var(--color-muted);
  cursor: pointer;
  transition: all 0.2s;
  font-weight: 500;
}
.chip:hover {
  border-color: var(--color-medium);
  color: var(--color-dark);
  background: #FFF;
}

.hero-stats {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 20px 48px;
  max-width: 820px;
  margin: 45px auto 0 auto;
  padding-top: 30px;
  border-top: 1px solid rgba(18, 84, 79, 0.12);
}
.stat-item { text-align: center; min-width: 140px; }
.stat-number {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 26px;
  font-weight: 600;
  color: var(--color-primary);
  display: block;
}
.stat-label { font-size: 13.5px; color: var(--color-muted); font-weight: 500; }

/* ==========================================================================
   CATEGORIAS E CARDS DE APPS (página inicial)
   ========================================================================== */
.section-title {
  margin: 50px 0 24px 0;
  font-size: 22px;
  font-weight: 700;
  color: var(--color-dark);
  display: flex;
  align-items: center;
  gap: 10px;
}
.section-title::before {
  content: '';
  display: block;
  width: 5px;
  height: 22px;
  background: var(--color-medium);
  border-radius: 3px;
}

.grid-apps {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
  gap: 22px;
}
.app-card {
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 26px;
  text-decoration: none;
  color: inherit;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: transform 0.2s, box-shadow 0.2s, border-color 0.2s;
}
.app-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 24px rgba(9, 35, 40, 0.08);
  border-color: var(--color-light);
}
.app-icon {
  font-size: 24px;
  margin-bottom: 16px;
  width: 48px;
  height: 48px;
  background: rgba(139, 187, 146, 0.25);
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
}
.app-card h3 { font-size: 18px; font-weight: 600; color: var(--color-dark); margin-bottom: 8px; }
.app-card p {
  font-size: 14.5px;
  color: var(--color-muted);
  margin-bottom: 22px;
  flex-grow: 1;
  line-height: 1.45;
}
.app-link { font-size: 14px; font-weight: 600; color: var(--color-medium); display: flex; align-items: center; gap: 4px; }

/* ==========================================================================
   PÁGINAS DE CALCULADORA (ex.: apps/adubacao.html)
   ========================================================================== */
.wrap {
  max-width: 860px;
  margin: 0 auto;
  padding: 32px 16px 90px 16px;
}

.app-header { margin: 8px 0 24px 0; }
.app-header h1 {
  font-size: clamp(24px, 4.5vw, 34px);
  font-weight: 700;
  line-height: 1.15;
  margin: 0 0 8px 0;
  color: var(--color-text);
}
.app-header p { margin: 0; color: var(--color-muted); font-size: 14.5px; line-height: 1.5; }

/* Stepper / Indicador de Progresso */
.stepper {
  display: flex;
  gap: 8px;
  margin: 20px 0 28px 0;
  border-bottom: 2px solid var(--color-border);
  padding-bottom: 12px;
}
.step-btn {
  flex: 1;
  background: transparent;
  border: none;
  padding: 8px 4px;
  text-align: left;
  cursor: pointer;
  border-bottom: 3px solid transparent;
  margin-bottom: -14px;
  transition: all .15s ease;
  border-radius: 0;
}
.step-btn .step-num {
  display: block;
  font-family: 'IBM Plex Mono', monospace;
  font-size: 11px;
  color: var(--color-muted);
  text-transform: uppercase;
}
.step-btn .step-lbl { font-size: 14px; font-weight: 600; color: var(--color-text); }
.step-btn.active { border-bottom-color: var(--color-primary); }
.step-btn.active .step-num { color: var(--color-primary); font-weight: 600; }

.mobile-step-indicator {
  display: none;
  font-family: 'IBM Plex Mono', monospace;
  font-size: 12px;
  font-weight: 600;
  color: var(--color-primary);
  background: rgba(18, 84, 79, 0.08);
  padding: 6px 12px;
  border-radius: 20px;
  margin-bottom: 16px;
  width: fit-content;
}

/* Painéis */
.panel { display: none; }
.panel.active { display: block; animation: fadeIn .2s ease; }
@keyframes fadeIn { from { opacity: 0; transform: translateY(3px); } to { opacity: 1; transform: translateY(0); } }

/* Cards de conteúdo (calculadoras) */
.card {
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: 20px;
  margin-bottom: 20px;
}
.card h2 { font-size: 18px; font-weight: 600; margin: 0 0 4px 0; color: var(--color-dark); }
.card .sub { color: var(--color-muted); font-size: 13.5px; margin: 0 0 16px 0; line-height: 1.4; }

/* Form Layout */
.grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; }
.grid.two { grid-template-columns: repeat(2, 1fr); }
.grid.four { grid-template-columns: repeat(4, 1fr); }

label { display: block; font-size: 12.5px; font-weight: 600; color: var(--color-text); margin-bottom: 5px; }
.unit { font-size: 11px; font-weight: 400; color: var(--color-muted); font-family: 'IBM Plex Mono', monospace; }

input[type=number], input[type=text], select {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid var(--color-border);
  border-radius: 6px;
  background: #FFF;
  font-family: 'IBM Plex Mono', monospace;
  font-size: 15px; /* evita zoom automático no mobile */
  color: var(--color-text);
  transition: border-color .15s ease;
}
select { font-family: 'IBM Plex Sans', sans-serif; }
input:focus, select:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 2px rgba(18, 84, 79, 0.15);
}

/* Modo Avançado */
details { margin-top: 14px; border-top: 1px dashed var(--color-border); padding-top: 12px; }
summary { cursor: pointer; font-size: 13px; font-weight: 600; color: var(--color-accent); user-select: none; }
details[open] summary { margin-bottom: 14px; }

/* Badges */
.badge {
  display: inline-block;
  padding: 3px 8px;
  border-radius: 4px;
  font-size: 11px;
  font-family: 'IBM Plex Mono', monospace;
  font-weight: 600;
  margin: 2px 4px 2px 0;
}
.badge.baixo { background: rgba(140, 90, 60, 0.12); color: var(--color-accent); }
.badge.medio { background: rgba(9, 35, 40, 0.08); color: var(--color-text); }
.badge.alto { background: rgba(42, 131, 95, 0.14); color: var(--color-primary); }
.badge.alerta { background: rgba(179, 74, 38, 0.12); color: var(--color-alert); }

/* Callouts */
.callout {
  border-left: 3px solid var(--color-accent);
  background: rgba(140, 90, 60, 0.06);
  padding: 12px 14px;
  border-radius: 0 6px 6px 0;
  font-size: 13.5px;
  color: var(--color-text);
  margin-top: 14px;
  line-height: 1.45;
}
.callout.warn { border-left-color: var(--color-alert); background: rgba(179, 74, 38, 0.06); }
.callout.ok { border-left-color: var(--color-primary); background: rgba(42, 131, 95, 0.07); }

/* Composições e subcabeçalhos */
.composition { font-family: 'IBM Plex Mono', monospace; font-size: 12px; color: var(--color-primary); margin-top: 4px; font-weight: 500; }
.subhead {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: .06em;
  color: var(--color-muted);
  margin: 18px 0 10px 0;
  border-top: 1px solid var(--color-border);
  padding-top: 14px;
  font-weight: 600;
}

/* Tabelas Responsivas */
.table-responsive { width: 100%; overflow-x: auto; -webkit-overflow-scrolling: touch; margin-top: 8px; }
table { width: 100%; border-collapse: collapse; font-size: 13.5px; white-space: nowrap; }
th, td { text-align: left; padding: 10px 8px; border-bottom: 1px solid var(--color-border); }
th { font-family: 'IBM Plex Mono', monospace; font-size: 11px; text-transform: uppercase; color: var(--color-muted); font-weight: 600; }
td.num, th.num { text-align: right; font-family: 'IBM Plex Mono', monospace; }

/* Botões e Barra de Navegação */
.nav-row { display: flex; justify-content: space-between; gap: 12px; margin-top: 10px; }
button.btn {
  font-family: 'IBM Plex Sans', sans-serif;
  font-weight: 600;
  font-size: 14.5px;
  padding: 12px 20px;
  border-radius: 6px;
  border: 1px solid var(--color-primary);
  cursor: pointer;
  background: var(--color-primary);
  color: #FFF;
  transition: background .15s ease, transform .1s ease;
}
button.btn:active { transform: scale(0.98); }
button.btn:hover { background: var(--color-dark); }
button.btn.ghost { background: transparent; color: var(--color-text); border-color: var(--color-border); }
button.btn.ghost:hover { border-color: var(--color-muted); background: transparent; }

/* ==========================================================================
   RODAPÉ (compartilhado por todas as páginas)
   ========================================================================== */
footer {
  margin-top: 80px;
  background: var(--color-dark);
  color: var(--color-light);
  padding: 40px 0;
  font-size: 14px;
}
.footer-wrap {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 20px;
}

/* ==========================================================================
   RESPONSIVO
   ========================================================================== */
@media (max-width: 768px) {
  nav { display: none; }
  .hero-stats { flex-direction: column; gap: 16px; }
  .grid-apps { grid-template-columns: 1fr; }
}

@media (max-width: 640px) {
  .wrap { padding: 16px 12px 90px 12px; }
  .stepper { display: none; }
  .mobile-step-indicator { display: inline-block; }
  .grid, .grid.two, .grid.four { grid-template-columns: 1fr; }

  /* Barra de navegação fixa no rodapé, no mobile, dentro das calculadoras */
  .panel .nav-row {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    background: #FFF;
    padding: 12px 16px;
    box-shadow: 0 -2px 10px rgba(0,0,0,0.08);
    border-top: 1px solid var(--color-border);
    z-index: 100;
    margin: 0;
  }
  .panel .nav-row button.btn { flex: 1; text-align: center; }
}