/* =========================
   RESET
========================= */
* {
  box-sizing: border-box;
  font-family: "Segoe UI", Arial, sans-serif;
}

body {
  margin: 0;
  background: #e6e6ea;
  color: #222;
}

/* =========================
   TOPO
========================= */
.top {
  display: flex;
  align-items: center;
  gap: 20px;
  padding: 14px 20px;
  background: #ffffff;
  border-bottom: 2px solid #ddd;
}

.back-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;

  padding: 6px 12px;
  border-radius: 8px;

  text-decoration: none;
  font-weight: 600;
  font-size: 14px;

  color: #ffffff;
  background: #333;
  border: 1px solid #ddd;

  transition: background 0.15s ease, color 0.15s ease, box-shadow 0.15s ease;
}

.back-link:hover {
  background: #e5e7eb;
  color: #111827;
  box-shadow: 0 1px 3px rgba(0,0,0,0.12);
}

.back-link:active {
  background: #d1d5db;
  box-shadow: none;
}


.title {
  display: flex;
  align-items: center;
  gap: 10px;
}

.title-icon {
  width: 28px;
  height: 28px;
}

/* =========================
   IDIOMA
========================= */
.lang-switch {
  margin-left: auto;
  display: flex;
  gap: 6px;
}

.lang {
  padding: 4px 8px;
  border: 1px solid #ccc;
  background: #fff;
  cursor: pointer;
  font-weight: 600;
}

.lang.active {
  background: #333;
  color: #fff;
}

/* =========================
   CONTEÚDO
========================= */
.content {
  padding: 20px;
}

/* =========================
   ABAS
========================= */
.unit-tabs {
  display: flex;
  gap: 10px;
  margin-bottom: 15px;
  flex-wrap: wrap;
}

.unit-tabs .tab {
  padding: 8px 14px;
  border: 1px solid #ccc;
  background: #fff;
  border-radius: 6px;
  cursor: pointer;
  font-weight: 600;
}

.unit-tabs .tab.active {
  background: #333;
  color: #fff;
  border-color: #333;
}

/* =========================
   BLOCO
========================= */
.unit-block {
  background: #ffffff;
  border-radius: 12px;
  padding: 22px;
  margin-bottom: 20px;
}

.unit-block h2 {
  margin-top: 0;
  font-size: 26px;
  color: #111827;
}

/* =========================
   GRID FIXO (SEMPRE 2 COLUNAS)
========================= */
.unit-grid {
  display: grid;
  grid-template-columns: 1.35fr 1fr;
  gap: 28px;
  align-items: flex-start;
}

/* =========================
   CÁLCULO
========================= */
.calc-box {
  border: 1px solid #d1d5db;
  border-radius: 12px;
  padding: 22px;
  background: #ffffff;
}

.calc-box h3 {
  margin-top: 0;
  margin-bottom: 16px;
  font-size: 22px;
  font-weight: 700;
  color: #1f2937;
}

/* INPUTS */
label {
  display: block;
  margin-bottom: 14px;
  font-size: 15px;
}

input,
select {
  width: 100%;
  padding: 8px;
  margin-top: 4px;
  font-size: 15px;
}

/* BOTÃO INVERTER */
.invert-btn {
  margin-top: 10px;
  padding: 8px 12px;
  border: 1px solid #ccc;
  background: #f5f5f5;
  border-radius: 6px;
  cursor: pointer;
  font-weight: 600;
}

.invert-btn:hover {
  background: #e0e0e0;
}

/* RESULTADO */
.result {
  margin-top: 18px;
  font-size: 22px;
  font-weight: 600;
  color: #111827;
}

#lenResult {
  cursor: pointer;
  font-weight: 700;
  color: #0f172a;
}

#lenResult.copied {
  color: #047857;
}

/* =========================
   REFERÊNCIA (SEMPRE À DIREITA)
========================= */
.ref-box {
  border: 2px solid #cfd4dc;
  border-radius: 12px;
  padding: 26px;
  background: #f8fafc;

  /* FIXA VISUALMENTE */
  position: sticky;
  top: 90px;
}

.ref-box h3 {
  margin-top: 0;
  margin-bottom: 16px;
  font-size: 22px;
  font-weight: 700;
  color: #1f2937;
}

#unitReference {
  margin: 0;
  padding-left: 26px;
}

#unitReference li {
  font-size: 19px;
  line-height: 1.7;
  margin-bottom: 10px;
  color: #111827;
}
/* ===== MODAL OVERLAY ===== */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.55);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 999;
}

.modal-overlay.hidden {
  display: none;
}

/* ===== MODAL ===== */
.modal {
  background: #fff;
  border-radius: 14px;
  width: 420px;
  max-width: 90%;
  padding: 24px 26px;
  position: relative;
  box-shadow: 0 20px 40px rgba(0,0,0,0.25);
}

.modal h2 {
  margin-top: 0;
  margin-bottom: 14px;
  font-size: 20px;
}

.modal ul {
  padding-left: 18px;
}

.modal li {
  margin-bottom: 8px;
  line-height: 1.4;
}

/* ===== CLOSE BUTTON ===== */
.modal-close {
  position: absolute;
  top: 12px;
  right: 12px;
  border: none;
  background: transparent;
  font-size: 18px;
  cursor: pointer;
}

/* ===== HELP BUTTON ===== */
.help-btn {
  background: #f1f1f1;
  border: 1px solid #ccc;
  border-radius: 8px;
  padding: 6px 10px;
  cursor: pointer;
  font-weight: 600;
}