/* ============================================================ */
/* BUTTONS — Shared button styles                                */
/* ============================================================ */

.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.7rem 1.5rem;
  background: var(--c-primary-blue);
  color: #fff;
  font-size: 0.9rem;
  font-weight: 600;
  font-family: inherit;
  border: none;
  border-radius: 8px;
  cursor: pointer;
  transition: background 0.2s, transform 0.15s;
  line-height: 1.3;
  text-decoration: none;
}

.btn-primary:hover {
  background: #1d4ed8;
  transform: translateY(-1px);
}

.btn-primary:focus-visible {
  outline: 2px solid var(--c-primary-blue);
  outline-offset: 2px;
}

.btn-ghost {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.6rem 1.25rem;
  background: transparent;
  color: var(--c-primary-blue);
  font-size: 0.85rem;
  font-weight: 600;
  font-family: inherit;
  border: 1px solid var(--c-primary-blue);
  border-radius: 8px;
  cursor: pointer;
  transition: background 0.2s, color 0.2s;
  line-height: 1.3;
  text-decoration: none;
}

.btn-ghost:hover {
  background: var(--c-primary-blue);
  color: #fff;
}

/* --- Zalo Buttons --- */
.btn-zalo {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.75rem 1.75rem;
  background: #0068ff;
  color: #fff;
  font-size: 0.95rem;
  font-weight: 600;
  font-family: inherit;
  border: none;
  border-radius: 10px;
  cursor: pointer;
  transition: background 0.2s, transform 0.2s, box-shadow 0.2s;
  line-height: 1.3;
  text-decoration: none;
  box-shadow: 0 4px 12px rgba(0,104,255,0.25);
}

.btn-zalo:hover {
  background: #0052cc;
  color: #fff;
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(0,104,255,0.35);
}

.btn-zalo:focus-visible {
  outline: 2px solid #0068ff;
  outline-offset: 2px;
}

.btn-zalo--lg {
  padding: 0.9rem 2.25rem;
  font-size: 1.05rem;
  border-radius: 12px;
}

.btn-zalo--hero {
  padding: 0.9rem 2.25rem;
  font-size: 1.05rem;
  min-height: 52px;
  border-radius: 14px;
}

.btn-zalo-outline {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.75rem 1.5rem;
  background: transparent;
  color: var(--c-primary);
  font-size: 0.9rem;
  font-weight: 600;
  font-family: inherit;
  border: 2px solid var(--c-primary);
  border-radius: 10px;
  cursor: pointer;
  transition: background 0.2s, color 0.2s, transform 0.2s;
  line-height: 1.3;
  text-decoration: none;
}

.btn-zalo-outline:hover {
  background: var(--c-primary);
  color: #fff;
  transform: translateY(-2px);
}

.btn-zalo-outline:focus-visible {
  outline: 2px solid var(--c-primary);
  outline-offset: 2px;
}