/* ====================================================== */
/* BOTÃO BASE                                             */
/* ====================================================== */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;

  padding: 14px 22px;
  border-radius: 18px;

  border: 1px solid transparent;
  background: transparent;

  font-family: inherit;
  font-size: 0.96rem;
  font-weight: 600;
  letter-spacing: -0.01em;
  text-decoration: none;
  cursor: pointer;

  transition:
    transform 0.25s ease,
    background 0.25s ease,
    border-color 0.25s ease,
    color 0.25s ease,
    box-shadow 0.25s ease;

  position: relative;
  overflow: hidden;
}

/* brilho suave interno */
.btn::before {
  content: "";

  position: absolute;
  inset: 0;

  background: linear-gradient(
    180deg,
    rgba(255,255,255,0.18),
    rgba(255,255,255,0)
  );

  opacity: 0;
  transition: opacity 0.25s ease;
}

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

.btn:hover::before {
  opacity: 1;
}

.btn:active {
  transform: translateY(0);
}

/* ====================================================== */
/* BOTÃO PRINCIPAL                                        */
/* ====================================================== */

.btn-principal {
  color: #ffffff;

  background: linear-gradient(
    135deg,
    #2f4657,
    #445c6d
  );

  border-color: rgba(68,92,109,0.12);

  box-shadow:
    0 10px 24px rgba(68,92,109,0.18),
    inset 0 1px 0 rgba(255,255,255,0.18);
}

.btn-principal:hover {
  background: linear-gradient(
    135deg,
    #3a5365,
    #516d80
  );

  box-shadow:
    0 16px 34px rgba(68,92,109,0.24),
    inset 0 1px 0 rgba(255,255,255,0.2);
}

/* ====================================================== */
/* BOTÃO SECUNDÁRIO                                       */
/* ====================================================== */

.btn-secundario {
  color: var(--text);

  background: rgba(255,255,255,0.72);
  border-color: rgba(68,92,109,0.10);

  backdrop-filter: blur(16px);

  box-shadow:
    0 8px 22px rgba(15,23,42,0.06),
    inset 0 1px 0 rgba(255,255,255,0.75);
}

.btn-secundario:hover {
  background: rgba(255,255,255,0.92);
  border-color: rgba(68,92,109,0.18);
  color: var(--petrol);

  box-shadow:
    0 14px 28px rgba(15,23,42,0.10);
}

/* ====================================================== */
/* BOTÃO OUTLINE                                          */
/* ====================================================== */

.btn-outline {
  color: var(--petrol);

  background: rgba(255,255,255,0.4);
  border-color: rgba(68,92,109,0.16);
}

.btn-outline:hover {
  background: rgba(68,92,109,0.08);
  border-color: rgba(68,92,109,0.24);
  color: #2f4657;
}

/* ====================================================== */
/* BOTÃO DOURADO PREMIUM                                  */
/* ====================================================== */

.btn-gold {
  color: #3a2a10;

  background: linear-gradient(
    135deg,
    #e2d0a4,
    #c9ae74
  );

  border-color: rgba(196,167,106,0.18);

  box-shadow:
    0 12px 28px rgba(196,167,106,0.18),
    inset 0 1px 0 rgba(255,255,255,0.45);
}

.btn-gold:hover {
  background: linear-gradient(
    135deg,
    #ead9b0,
    #d3b77f
  );

  box-shadow:
    0 18px 36px rgba(196,167,106,0.24);
}

/* ====================================================== */
/* BOTÃO PEQUENO                                          */
/* ====================================================== */

.btn-small {
  padding: 10px 16px;
  border-radius: 14px;
  font-size: 0.88rem;
}

/* ====================================================== */
/* BOTÃO GRANDE                                           */
/* ====================================================== */

.btn-large {
  padding: 18px 30px;
  border-radius: 20px;
  font-size: 1rem;
}

/* ====================================================== */
/* BOTÃO DE VOLTAR                                        */
/* ====================================================== */

.btn-voltar {
  display: inline-flex;
  align-items: center;
  gap: 8px;

  margin: 32px 0 24px;

  padding: 12px 18px;
  border-radius: 16px;

  text-decoration: none;
  font-weight: 600;

  color: var(--petrol);

  background: rgba(255,255,255,0.72);
  border: 1px solid rgba(68,92,109,0.10);

  box-shadow:
    0 8px 20px rgba(15,23,42,0.05),
    inset 0 1px 0 rgba(255,255,255,0.75);

  transition: all 0.25s ease;
}

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

  background: rgba(255,255,255,0.95);
  border-color: rgba(68,92,109,0.18);

  color: #2f4657;

  box-shadow:
    0 14px 28px rgba(15,23,42,0.10);
}

/* ====================================================== */
/* RESPONSIVO                                             */
/* ====================================================== */

@media (max-width: 768px) {
  .btn,
  .btn-large {
    width: 100%;
  }
}