:root {
  --amarelo: #FFD000;
  --preto: #050505;
  --cinza: #111111;
  --cinza-2: #1c1c1c;
  --branco: #ffffff;
  --texto: #d9d9d9;
  --verde: #25D366;
}

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

body {
  min-height: 100vh;
  font-family: Arial, Helvetica, sans-serif;
  background:
    radial-gradient(circle at top left, rgba(255, 208, 0, 0.22), transparent 32%),
    radial-gradient(circle at bottom right, rgba(255, 208, 0, 0.12), transparent 30%),
    var(--preto);
  color: var(--branco);
}

.app {
  width: 100%;
  min-height: 100vh;
}

.hidden {
  display: none !important;
}

.login-screen {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 24px;
}

.login-card {
  width: 100%;
  max-width: 430px;
  padding: 32px;
  border-radius: 26px;
  background: rgba(17, 17, 17, 0.92);
  border: 1px solid rgba(255, 208, 0, 0.18);
}

.glow {
  box-shadow: 0 0 35px rgba(255, 208, 0, 0.16);
}

.brand {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 28px;
}

.brand-mark {
  width: 52px;
  height: 52px;
  border-radius: 16px;
  display: grid;
  place-items: center;
  background: var(--amarelo);
  color: var(--preto);
  font-size: 28px;
  font-weight: 900;
  box-shadow: 0 0 22px rgba(255, 208, 0, 0.55);
}

.brand h1 {
  font-size: 25px;
}

.brand p,
.hero p,
.panel p {
  color: var(--texto);
  line-height: 1.5;
}

.form {
  display: grid;
  gap: 12px;
}

label {
  color: var(--amarelo);
  font-weight: 700;
  font-size: 14px;
}

input {
  width: 100%;
  border: 1px solid rgba(255, 208, 0, 0.18);
  background: #0a0a0a;
  color: var(--branco);
  padding: 15px;
  border-radius: 14px;
  outline: none;
  font-size: 16px;
}

input:focus {
  border-color: var(--amarelo);
  box-shadow: 0 0 0 3px rgba(255, 208, 0, 0.12);
}

.btn {
  border: 0;
  border-radius: 14px;
  padding: 14px 18px;
  font-weight: 800;
  cursor: pointer;
  transition: 0.2s ease;
}

.btn:hover {
  transform: translateY(-2px);
}

.primary,
.destaque {
  background: var(--amarelo);
  color: var(--preto);
  box-shadow: 0 0 18px rgba(255, 208, 0, 0.35);
}

.ghost {
  background: transparent;
  color: var(--branco);
  border: 1px solid rgba(255, 255, 255, 0.18);
}

.erro {
  color: #ff6b6b;
  min-height: 20px;
}

.system-screen {
  width: min(1180px, calc(100% - 32px));
  margin: 0 auto;
  padding: 22px 0 40px;
}

.topbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 22px;
}

.mini {
  margin: 0;
}

.mini .brand-mark {
  width: 44px;
  height: 44px;
  font-size: 22px;
}

.mini h1 {
  font-size: 20px;
}

.hero {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 28px;
  align-items: center;
  padding: 34px;
  border-radius: 30px;
  background: linear-gradient(135deg, rgba(20,20,20,.96), rgba(5,5,5,.96));
  border: 1px solid rgba(255, 208, 0, 0.14);
}

.tag {
  display: inline-block;
  padding: 8px 12px;
  border-radius: 999px;
  background: rgba(255, 208, 0, 0.12);
  color: var(--amarelo);
  font-weight: 800;
  margin-bottom: 14px;
}

.hero h2 {
  font-size: clamp(30px, 5vw, 54px);
  line-height: 1.02;
  margin-bottom: 14px;
}

.calc-card,
.panel {
  background: rgba(255, 255, 255, 0.035);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 24px;
  padding: 24px;
}

.money-input {
  margin-top: 8px;
  display: flex;
  align-items: center;
  gap: 10px;
  background: #080808;
  border: 1px solid rgba(255, 208, 0, 0.18);
  border-radius: 16px;
  padding-left: 14px;
}

.money-input span {
  color: var(--amarelo);
  font-weight: 900;
}

.money-input input {
  border: 0;
  box-shadow: none;
  background: transparent;
  font-size: 24px;
  font-weight: 800;
}

.buttons {
  display: grid;
  gap: 10px;
  margin-top: 16px;
}

.option {
  background: var(--cinza-2);
  color: var(--branco);
  border: 1px solid rgba(255, 255, 255, 0.10);
}

.result-area {
  margin-top: 24px;
}

.panel-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 20px;
}

.whatsapp {
  background: var(--verde);
  color: white;
  white-space: nowrap;
}

.whatsapp:disabled {
  opacity: 0.45;
  cursor: not-allowed;
  transform: none;
}

.resultado {
  display: grid;
  gap: 12px;
}

.resultado.vazio {
  color: #aaa;
  padding: 22px;
  border: 1px dashed rgba(255, 255, 255, 0.15);
  border-radius: 18px;
}

.linha {
  display: flex;
  justify-content: space-between;
  gap: 14px;
  padding: 15px;
  border-radius: 16px;
  background: #0c0c0c;
  border: 1px solid rgba(255, 255, 255, 0.06);
}

.linha strong {
  color: var(--amarelo);
}

.total {
  background: rgba(255, 208, 0, 0.12);
  border-color: rgba(255, 208, 0, 0.25);
}

@media (max-width: 820px) {
  .hero {
    grid-template-columns: 1fr;
    padding: 22px;
  }

  .topbar,
  .panel-head {
    align-items: flex-start;
    flex-direction: column;
  }

  .whatsapp,
  .ghost {
    width: 100%;
  }
}